УСТРОЙСТВО ПРОЯВКИ

... 1. Устройство проявки, содержащее:элемент переноса проявителя для переноса проявителя, включающего в себя тонер и магнитный носитель для проявки скрытого изображения, сформированного на упомянутом элементе переноса изображения, причем упомянутый элемент переноса проявителя включает в себя поверхность, имеющую множество канавок, проходящих в продольном направлении;магнит, обеспеченный внутри упомянутого элемента переноса проявителя, для притяжения проявителя к поверхности упомянутого элемента переноса проявителя;немагнитный элемент регулировки, обеспеченный на удалении от упомянутого элемента переноса проявителя, для регулировки количества проявителя, переносимого на упомянутом элементе переноса проявителя,причем количество M/S (мг/мм) проявителя, переносимого на единице площади упомянутого элемента переноса проявителя после пропускания упомянутым элементом регулировки, зазор SB (мм) между свободным концом упомянутого элемента регулировки и упомянутым элементом переноса проявителя, плотность ...

Mittels Reibung aufladendes Element, für positiv aufladbaren Toner

TRIBOELEKTRISCHES LADEELEMENT

Elektrophotographisches Aufzeichnungsgerät

Entwicklungsvorrichtung

VERFAHREN ZUM BESCHICHTEN EINER UNTERLAGE MIT ISOLIERENDEN TEILCHEN

Development unit needing few connections to electrophotographic equipment

Appts. for developing a static latent image on light-sensitive unit has: (a) a carrier, which is kept at a constant first voltage, for holding a layer of developer on its surface and transferring the developer by contact with the light-sensitive unit; (b) a conductive regulator, also connected to the voltage source, to keep the thickness of the developer layer constant; and (c) a constant voltage element connected to the voltage source and regulator to keep the latter at a second, different, constant voltage by using a current depending on an equilibrium between the surface potential of the light-sensitive unit and the source potential. Also claimed are appts. with (c') an element for producing a second, different p.d. between the voltage source and regulator using a current depending on the difference between the surface potential of the light-sensitive unit and the source potential; and appts. in which the development appts. can be inserted in and removed from the main imaging device ...

DEVELOPING SYSTEMS

... 1320232 Developing apparatus XEROX CORP 30 June 1970 [1 July 1969] 31602/70 Heading G2H Liquid or dry developer is applied to a surface bearing a latent image from an applicator which has been doctored by a pair of edge-and-corner doctors and a main doctor. The applicator may be a patterned roll 25 or an endless belt Fig.3 (not shown) in contact with a feed roll partially immersed in liquid developer. Roll or blade doctors may be employed. An edge-and-corner blade doctor for a belt applicator may have an acute re-entrant angle.

ELECTROGRAPHIC APPARATUS

... 1361092 Electrographic developing apparatus INTERNATIONAL BUSINESS MACHINES CORP 6 Dec 1971 [23 Dec 1970] 56461/71 Heading G2H A toner applicator 13 (e.g. a roller or belt) is loaded with toner from a reservoir 15, the toner is doctored and triboelectrically charged by spring mounted blades 16 and then the applicator 13 is contacted with an image bearing drum 10 without any relative peripheral motion therebetween. The blades 16 may be of P. T. F. E. or polyformaldehyde. Applicator 13 may be electrically biased. The toner may be subjected to corona discharge before application.

Developing apparatus

A developing apparatus is constructed so that a first rugged surface portion is formed on that portion of the surface of an elastic blade which faces and is pressed against a developing roller, thereby reducing the conveying force to carry the developing agent in contact with the first rugged surface portion under the pressure of the elastic blade. In this way, the layer of the developing agent flowing to the contact point between the developing roller and the elastic blade is gradually thinned to form a uniformly thin layer of developing agent on the surface of the developing roller.

METHOD FOR ADJUSTING A DOCTOR GAP OF A DEVELOPMENT DEVICE IN AN ELECTROPHOTOGRAPHIC PRINTER

Improvements in and relating to electrophotographic development apparatus

An electrophotographic copier is described in which dry toner (T) is fed to the outer surface (5) of a photoconductive drum to develop an electrostatic image. The dry toner (T) is stored in a hopper (9) and the toner (T) is extracted from the bottom of the hopper by a roller (7) or belt which brings the toner (T) past doctor (9a) into contact with the image and develops it. An electrode (10) is immersed in the toner in the hopper and is energised to impart an electrostatic charge of one polarity or the other to the toner. This enables positive and negative image development to be achieved far more readily than in previously proposed copiers in which the toner was triboelectrically charged. In an alternative arrangement [fig. 7 (not shown)] the roller is disposed above the hopper and the electrode, in the form of a roller, contacts the developer on the surface thereof. ...

DEVELOPMENT EQUIPMENT

HALF TONE DEVELOPMENT FOR TOUCHDOWN SYSTEM

A touchdown system for obtaining many distinctive steps in grey scale rendition when developing solid areas comprises a toner laden donor member and a toner layer pattern forming member. The pattern forming member has an electrode arranged in such a manner thereon that when a predetermined field is established between the electrode and the donor member, a predetermined pattern of peaks and valleys will be formed in the toner layer. When this patterned toner layer is presented to an electrostatic solid area latent image, the weakest charged portions of the latent image will attract only the toner from the portion of the layer which is closest thereto i.e., the peaks, thereby presenting a dot pattern development thereon. The strongest charged portion of the electrostatic latent image will attract toner not only from the closest portion or peaks but will also attract toner from the valleys which will fully develop the image where the charge is strongest. m e charged pattern of the latent image ...

APPARATUS, PROCESS FOR CHARGING INSULATING TONER PARTICLES

IMAGE DEVELOPING TECHNIQUES

REINFORCED DOCTOR BLADE ASSEMBLY SEAL AND PRINTER CARTRIDGE EMPLOYING THE REINFORCED SEAL

A reinforced doctor blade assembly seal includes a base strip of a flexible plastic film having a thickness, a surface of predetermined area bounded by multiple edges, and a foldable region extending length-wise between one pair of the multiple edges and spaced from and located intermediately between another pair of the multiple edges. The seal also includes a supplemental strip of a flexible plastic film. The supplemental strip is laminated on the base strip offset from and along one side of the foldable region on the base strip such that the base strip has adjacent laminated and non-laminated portions along opposite sides of the foldable region with the laminated portion having a greater thickness than the non-laminated portion. The seal has an attaching mechanism in the form of an adhesive coating on the non laminated portion of the base strip. The seal is employed in a printer cartridge ...

DEVELOPING DEVICE AND METHOD FOR LOCATING A TONER RESTRICTING MEMBER AT A DEVELOPING DEVICE

A developing device includes a movable toner carrier having its surface deposited with a toner and toner restricting member arranged parallel to the toner carrier. The toner restricting member comprises a retaining rod made of an elastic material and a contact unit provided on the outer periphery of the retaining rod, extending in an axial direction of the retaining rod and having at least one contact area set in contact with the surface of the toner carrier.

DEVELOPING DEVICE AND METHOD FOR LOCATING A TONER RESTRICTING MEMBER AT A DEVELOPING DEVICE

Verfahren und Vorrichtung zur Entwicklung eines latenten elektrostatischen Bildes

RESERVOIR FOR FEEDING THE DEVELOPER AND SYSTEM FOR FEEDING DEVELOPER

Two-component developing device and process cartridge

A two-component developing apparatus includes a developer carrier, a first regulating member, a developer container, and a toner container. The developer carrier is configured to carry and transfer the two-component developer including a magnetic carrier. The first regulating member is configured to regulate an amount of the two-component developer carried and transferred by the developer carrier. The developer container is configured to receive the developer removed by the first, regulating member. The toner container is configured to supply toner to the developer carrier. The developer stirring member is configured to carry and stir the developer between the first regulating member and the second regulating member. The second regulating member includes a support member on one end side of the second regulating member in its longitudinal direction to which greater amount of the developer is supplied than to another end side of the second regulating member.

Electrophotographic process cartridge

Developing device, image forming apparatus and image forming method

The present invention provides a developing device, an image forming apparatus and an image forming method using a roller to form the image which are used for restraining unevenness of electrification amount of a toner on a toner carrying roller, thereby restrain fog. For example, a toner of an external additive containing metallic oxide such as titanium oxide is used. A surface of a developing roller (44) is provided with convex portions (441) and concave portions (442) which are regularly arranged so that a height difference (Hd) is larger than a volume average grain diameter of the toner and the concave portions (442) carry more than one layers of toner layer. A limited blade 46 formed by an elastic component (462) is applied with limited bias voltage (Vrb) which is a negative potential compared with the developing roller (44); a weakly electrified toner and a strongly electrified toner which are not contacted with a suction pipe (44) in the toner of the concave portions (442) are selectively ...

Developing device and image forming device with the same

The present invention provides a developing device which prevents the fluctuation of component and can form a single component developing mode of homogeneous toner thin film with a simple structure, and an image forming device with the developing device. A boundary wall (23) which is formed with a first opening (28) and a second opening (29) on the developing device (4a) is divided into a toner mixing part (21) and a toner supplying part (22). A mixing paddle (24) is rotatably pivoted and supported in the toner mixing part (21). The inner part of the toner supplying part (22) is provided with a developing roller (25), a toner supplying roller (26), a restricting component (27) which restricts the thickness of toner on the metal developing roller (25) and electrifies the toner, etc. The whole area in the length direction is formed with a slot part (27a) on the restricting component (27).

DEVELOPING APPARATUS, DEVELOPING METHOD AND MAGNETIC TONER FOR DEVELOPING APPARATUS

화상 형성 장치

... 화상 형성 장치는, 회전 가능한 감광체와, 대전 부재와, 노광 유닛과, 현상 부재와, 현상 전압 인가부와, 전사 부재와, 제1 전사 전압 인가부와, 제2 전사 전압 인가부와, 공통의 전원과, 제어부를 가진다. 상기 제어부는, 화상 형성 동작과 비화상 형성 동작, 그리고 상기 비화상 형성 동작으로서 클리닝 동작을 실행하도록 제어한다. 상기 제어부는, 상기 클리닝 동작시 상기 현상 전압 인가부가 상기 현상 부재에 인가하는 전압의 값을, 상기 토너상의 형성시에 상기 현상 전압 인가부가 상기 현상 부재에 인가하는 전압의 값과 다르게 하도록, 상기 공통의 전원의 출력의 변경을 제어한다.

DEVELOPING APPARATUS

... [Problem] To provide a developing apparatus capable of effectively scraping off developing agent retained in the brush layer of a brush roller using a scraping member. [Solution] A developing apparatus has: a housing (54) having a supply unit (67) capable of storing toner (T) (developing agent); a roller body (32); and a brush layer (33) obtained by implanting fibers in the outer peripheral surface of the roller body (32), the apparatus being provided with: a brush roller (31) supported by the housing (54) so as to contact the toner (T) inside the supply unit (67); and a blade (35) (scraping member) contacting the brush roller (31) above the position where the brush roller (31) faces the toner (T) inside the supply unit (67), the blade (35) being configured so as to scrape the toner (T) retained in the brush layer (33). The housing (54) has a partition (61) disposed facing the brush roller (31) below the position where the blade (35) contacts the brush roller (31), the partition being capable ...

DEVELOPER SUPPLY DEVICE

... [Problem] To provide a structure that can excellently support a developer on a brush roller in a developer supply device that uses a brush roller as a developer support body. [Solution] A developer regulating member scrapes off some of the developer temporarily supported on a brush layer to regulate the amount of developer supported, and comprises a regulating member main body part and a regulating part. The regulating member main body part is a sheet shaped member affixed to a casing and is provided so as to extend toward the upstream side from the downstream side in the direction of rotation of a developer support member. The regulating part is provided on the tip part of the regulating member main body part in the direction of extension so as to penetrate into the brush layer by protruding on the rotational center axis side of the developer support member.

COMPONENT FOR A PRINTER, FAX MACHINE, COPIER OR THE LIKE

Member for a printer, a fax machine, a copier or a toner cartridge, in which said member has a face R1, (5) in contact with toner particles, said face R1, (5) being provided with a top layer (4) in contact with toner particles, said top (4) layer comprising substantially spherical particles (6) with a Mohs hardness of more than 3 or equal to 3 and an average particle size lower than 100μm.

Developing Cartridge

A developing cartridge may include a housing configured to hold toner. The cartridge may further include a developing roller including a developing roller shaft, a supply roller including a supply roller shaft, a developing electrode and a supply electrode. The developing electrode and supply electrode may be configured to guide an electrical contact of an image forming apparatus in one or more directions. In some examples, the developing electrode and supply electrode may have angled surfaces that extend toward one another.

METHOD AND COMPOSITION FOR RECOATING TONER CARTRIDGE DEVELOPING MEMBER

Methods of recoating a developing member such as the doctor blade, developing member bar or a developing sleeve, of an electro-photographic image forming apparatus, such as a laser printer toner cartridge, methods of re-using the original components by re-coating them, to cut the cost of using new aftermarket parts and to reduce waste, which methods include close quality control and tailoring of formulations to a specific developing system, thus achieving better print quality in terms of density, page yield, and uniformity for the repaired or remanufactured toner cartridge.

Developing device and image forming apparatus

A developing device including: a developer carrying member that is rotatably supported and carries a developer; and a layer thickness regulating member that extends in an axial direction of the developer carrying member and is provided with a pressing part that is in pressure contact with a surface of the developer carrying member to form a thin layer of the developer on the surface of the developer carrying member. The pressing part includes a center portion and two end portions. The center portion of the pressing part is formed of a first elastic material. The end portions of the pressing part are formed of a second elastic material that is different from the first elastic material.

Developer transporting amount controlling member, developing apparatus, imaging apparatus, and method for exchanging developing unit

A developer transporting amount controlling member that is used in a developing apparatus is disclosed. The developing apparatus includes a recording unit having a surface that sustains an electrostatic latent image and attracts a developer, a developer transporting unit that transports the developer, and a developing unit that guides the developer to the recording unit. The recording unit, the developer transporting unit, and the developing unit have rotational center axes that are parallel to each other. The developer transporting amount controlling member includes a magnetic part and a nonmagnetic part that is harder than the magnetic part and is fixed to the developing apparatus such that a portion of the nonmagnetic part is disposed closest to the developing unit.

Image forming apparatus

A developing apparatus for supplying a developer to a photoreceptor so that an electrostatic latent image on the photoreceptor is developed with the developer. The developing apparatus comprises a developer conveyer, having a rigid surface, for conveying the developer to a developing zone; a developer layer-thickness regulator, shaped like a bar and having a rigid surface portion of the curvature radius between 0.5 mm and 15 mm, for regulating the thickness of the developer to be conveyed to the developing zone; and a supporter for supporting the developer layer-thickness regulator.

Developing device with rigid member toner limiting means

An apparatus for developing an electrostatic latent image which includes a developing agent application assembly and a limiting device for limiting the amount of the developing agent held on the surface of the developing agent application assembly. The limiting device is made of a rigid member such as a sheet glass and its one surface is brought into forced contact with the surface of the developing agent application assembly.

Developing apparatus using one-component non-magnetic toner

Toner bottle

A toner bottle has a bottle body (1) containing toner and a cap (5) closing an opening portion (3) formed in the bottle body (1), and toner is supplied through the opening portion (3). A plateshaped toner scraping member (20) extending into the opening portion (3) and having elasticity is provided on the back surface of the cap (5) in the diameter direction of the cap (5). Also, the outer end of the toner scraping member (20) is positioned inside of the bottle body (1) beyond the opening portion (3) even when the cap (5) is in its cap-opened position. If the toner bottle is constructed in this way, the toner on the opening portion (3) will be scraped by the toner scraping member (20) and toner condensation can be reliably prevented at the opening portion (3) when toner is supplied from the bottle body (1) by rotation of the toner bottle.

Developing apparatus having developing agent layer forming blade

A developing apparatus includes a developing roller having a conductive layer, and a developer layer forming blade for forming a developer layer on the developing roller. The developer layer forming blade is formed of a layered member having a charging layer, and the conductive layer of the developing roller has wear-resistance equal to or higher than that of the charging layer of the developer layer forming blade.

Image forming apparatus featuring a regulating member for regulating a number of layers of a developer carried by a developer carrying member

An image forming apparatus includes an image bearing member for bearing an electrostatic latent image, and a developing device for developing the electrostatic latent image with a developer and collecting the developer remaining on the image bearing member including a developer carrying member for carrying the developer. The developer carried by the developer carrying member comes into contact with the image bearing member as the developer carrying member moves and a regulating member for regulating a layer thickness of the developer carried by the developer carrying member. The regulating member regulates the layer thickness of the developer carried by the developer carrying member so that there will be three to eight layers, wherein V2/V1>1.54 holds where V1 is a peripheral velocity of said image bearing member and V2 is a peripheral velocity of said developer carrying member.

Developing device

A developing device includes: a developing roller that rotates in a given rotation direction; and a regulating portion that regulates the amount of feed of developer. The developing roller includes a circumferential surface on which a regulating pole having single polarity is formed. At the regulating pole, a magnetic flux density in a direction normal to the circumferential surface of the developing roller takes a maximum in a first position on the circumferential surface in the rotation direction and takes a value half of the maximum in a second position and a third position on the circumferential surface in the rotation direction. The first position is shifted downstream from a intermediate position between the second and third positions. A tip portion of the regulating portion faces a position between the first position and the intermediate position or faces the first position.

DEVELOPING DEVICE AND IMAGE FORMING APPARATUS

A developing device is provided. A developing device bears a developer stored in a developer tank on a developing roller and conveys the developer to a photoreceptor drum to develop an electrostatic latent image. A doctor blade is provided to come into pressure-contact with the developing roller, and regulates layer thickness of the developer borne on the developing roller. The doctor blade has an elastic rubber section and a support section. The support section has a fixation section that is formed into a plate shape in parallel to the axis of the developing roller and is fixed to the developer tank, and an insertion section that continues from the fixation section and is inserted into the elastic rubber section. The insertion section has an proximity curved section that is curved in a direction in proximity to the developing roller.

Developing device and image forming apparatus

A developing device containing a developer holding body for executing developing by affixing developer to an image support body, a controlling unit for thinning a layer of developer and disposed to contact the developer holding body, a support unit for supporting the controlling unit, an elastic sealing unit provided with a contact surface contacting the support unit and disposed on an edge side of the controlling unit, and a guiding unit for controlling an installation direction of a developing blade member at a time when the developing blade member is mounted on the elastic sealing unit, provided with a guiding surface formed at a prescribed angle in relation to the contact surface of the elastic sealing unit. The present invention attempts to prevent developer leakage from between a controlling unit and a sealing unit.

ELECTROSTATIC IMAGE DEVELOPING TONER, ELECTROSTATIC IMAGE DEVELOPER, PROCESS CARTRIDGE, IMAGE FORMING APPARATUS, AND IMAGE FORMING METHOD

An electrostatic image developing toner including: a toner particle containing a binder resin having a polyester resin and a coloring agent; and a non-colored particle containing a polyester but not containing a coloring agent and having a shape factor SF1 of not more than 110, wherein an amount of Sn element contained in the non-colored particles is larger than an amount of Sn element contained in the toner particle.

Developing device and image forming apparatus

A developing device and image forming apparatus are provided. The developing device includes a chassis; a developer carrying member; a thickness regulating member; a supply member; and a conveying member. In a state in which the developing device is attached to a main body an opening of the chassis faces upward; the thickness regulating member pressure-contacts the developer carrying member from below the developer carrying member; the conveying member is disposed below the developer carrying member; the supply member overlaps a portion of the conveying member in a horizontal direction; and a portion of the conveying member is disposed within a vertical projection plane between a pressure-contact position of the thickness regulating member to the developer carrying member, and a contact position of the supply member to the developer carrying member. The image forming apparatus includes a main body; a plurality of photosensitive members; and a plurality of developing devices.

DEVELOPING APPARATUS AND PROCESS CARTRIDGE

The developing apparatus includes a developer carrying member carrying a developer on the surface thereof, a developing frame member rotatably supporting the developer carrying member, and accommodating the developer, and a regulating member fixed to the developing frame member to regulate the developer carried on the developer carrying member, the regulating member has a projecting part, having an abutting part arranged to abut the developer carrying member, and an opposing surface, arranged to face the developer carrying member connected to the projecting part and including an end disposed as a free end, positioned on the downstream side in the rotational direction of the developer carrying member from the projecting part, and the opposing surface being a surface having no point of reverse curve in which the distance between the opposing surface and the developer carrying member is constant or decreases with distance from the projecting part. 1. A developing apparatus , comprising:a developer carrying member which carries a developer on a surface thereof,a developing frame member which rotatably supports the developer carrying member, and accommodates the developer, anda regulating member fixed to the developing frame member to regulate the developer carried on the developer carrying member,wherein the regulating member has a projecting part, having an abutting part arranged to abut the developer carrying member, and an opposing surface, arranged to face the developer carrying member connected to the projecting part and including an end disposed as a free end, positioned on the downstream side in the rotational direction of the developer carrying member from the projecting part, andthe opposing surface being a surface having no point of reverse curve in which the distance between the opposing surface and the developer carrying member is constant or decreases with distance from the projecting part.2. The developing apparatus according to claim 1 ,wherein the ...

Electrostatic image developing toner, electrostatic image developer, process cartridge, image forming apparatus, and image forming method

An electrostatic image developing toner including: a toner particle containing a binder resin having a polyester resin and a coloring agent; and a non-colored particle containing a polyester but not containing a coloring agent and having a shape factor SF1 of not more than 110, wherein an amount of Sn element contained in the non-colored particles is larger than an amount of Sn element contained in the toner particle.

Mounting surfaces for wiper blades

In example implementations, an apparatus includes a planar surface, a curved mounting surface and a wiper blade. The curved mounting surface may be coupled adjacent to the planar surface. The wiper blade may be clamped to the planar surface. A bottom of the wiper blade can rest on the curved mounting surface such that a free length of the wiper blade is different at a plurality of points along a width of the wiper blade.

Toner cartridge and method for reducing image artifact

A method of reducing an image artifact in a remanufactured toner cartridge. The method includes operating the remanufactured toner cartridge to transfer toner to a position between a developer roller and a metering blade of the remanufactured toner cartridge, the toner having a first formulation; and positioning a material having a second formulation different from the first formulation between the developer roller and the metering blade.

Developing service and image forming apparatus

A developing device and an image forming apparatus including the developing device are provided. The developing device includes a housing, a developer carrier which is rotatably supported by the housing, and which carries developer on a circumferential surface thereof, a layer thickness regulating member which includes, a blade contacting the circumferential surface of the developer carrier along a rotational axial direction of the developer carrier, and a support member supporting the blade, the layer thickness regulating member for regulating a layer thickness of the developer on the circumferential surface of the developer carrier. The support member includes: a contact part which contacts the blade; and a pair of attachment parts which are attached to the housing. The attachment parts are provide at both sides of the contact part in the rotational axial direction and are further protruded than the contact part in a direction away from the developer carrier.

Developing device and image forming apparatus including the same

Developing unit and image forming apparatus

A developing unit is provided, which comprises a developer accommodating section to accommodate developer; a developing member (3) to provide said developer accommodated in said developer accommodating section to an image carrying body by rotating; a developer layer forming member (5) to form a developer layer by shaving said developer on surface of said developing member (3); and a restricting member (20) to restrict fluidity of said developer at an upstream side in a rotating direction of said developing member (3) in front of a contact part of said developer layer forming member (5) and the developing member (3).

A developing apparatus

DEVELOPING DEVICE

PURPOSE: To prevent a developed picture from disturbance, the generation of fog and uneven density, a change with the lapse of time, and environmental change by applying charge having reverse polarity against developing polarity to a developer on a developer carrying member prior to development in a contactless developing device using an one-component developer. CONSTITUTION: A part of the whole of a charge applying electrode 8 is embedded into toner 5 to be a developer in a toner stock 3 and a developer carrying member 4 consists of a cylinder (electrode) 6 and a semiconductive layer 7 coverting the surface of the cylinder 6. A bias voltage is applied to the electrode 8 from a charge applying power supply 8'. An electrostatic image is formed on a photosensitive substance 1 which is an electrostatic latent image carrying member 4. The conductive 5 is formed on the member 4 as a single developer layer and then carried to a developing area. Change having reverse polarity against that formed ...

DEVELOPING DEVICE AND IMAGE FORMING APPARATUS

PROBLEM TO BE SOLVED: To form images of high image quality free from image defects such as white stripes, for a long period of time by preventing toner fusion to a doctor blade in a developing device in an electrophotographic image forming apparatus. SOLUTION: A developing device 1 including a developing tank 2, a developing roller 3, a supply roller 4, an agitating member 5, and a doctor blade 6 is provided with; a cleaning member 7 which is provided so as to be allowed to come into contact with and separate from a contact part to the developing roller 3 of the doctor blade and cleans a surface of the doctor blade 6 when coming into contact with the contact part; a supporting means 8 which supports the cleaning member so that the cleaning member 7 is allowed to come into contact with and separate from the contact part to the developing roller 3 of the doctor blade 6; and a driving means 9 which brings the cleaning member 7 into contact with the contact part to the developing roller 3 of ...

画像形成装置

NON-MAGNETIC ONE-COMPONENT DEVELOPING DEVICE

PURPOSE: To obtain a copy stable for a long period of time without accumulation of electrostatic charge by using a material having a specific value or below of specific resistance for a leveling member for forming a non-magnetic toner on a carrying body which conveys the toner from a contg. hopper to a thin and uniform layer. CONSTITUTION: A roll 5 which is the toner carrying body is rotated while a bias voltage is impressed thereto from an electric power source 8 and substantial electric charge is provided to the non-magnetic one-component toner 1 by sliding contact between the leveling member 4 and the roll 5 in such a way that the toner 1 from a hopper 2 is formed to the layer having uniform electric charge on the roll 5. A metallic core 4A coated with an elastic material 4B formed by dispersing conductive carbon, Al powder, etc. into a thermosetting resin such as phenolic resin or melamine resin or thermoplastic resin such as acrylic resin and having specific resistance within a 104W1010Ωcm ...

КАРТРИДЖ И БЛОК

Изобретение имеет отношение к картриджу, устанавливаемому с возможностью отсоединения на основном узле электрофотографического устройства формирования изображений и к блоку для использования с электрофотографическим устройством формирования изображений. Предложенная группа изобретений включает картриджи, устанавливаемые с возможностью отсоединения на основной узел устройства формирования изображений, и блоки для использования с устройством формирования изображений. Причем картридж, устанавливаемый с возможностью отсоединения на основной узел устройства формирования изображений, содержит вращающийся элемент, ножевой элемент, который включает резиновую часть, входящую в контакт с упомянутым вращающимся элементом, и металлическую пластинчатую часть для поддержки резиновой части, корпус, сформированный из полимерного материала, для поддержки упомянутого ножевого элемента и уплотняющий элемент, проходящий в направлении, пересекающем осевое направление упомянутого вращающегося элемента, обеспеченный ...

ПРОЯВОЧНОЕ УСТРОЙСТВО

Настоящее изобретение относится к проявочному устройству для формирования видимого изображения путем нанесения проявителя на электростатическое скрытое изображение, образованное переносящим изображение элементом. Проявочное устройство включает в себя проявляющий цилиндр для переноса проявителя, содержащего магнитный носитель и немагнитный тонер, и для проявления электростатического скрытого изображения, образованного на переносящем изображение элементе; магнит, предоставленный в цилиндре и включающий в себя множество магнитных полюсов, расположенных вдоль кругового направления цилиндра, для переноса проявителя на цилиндре; и регулирующий элемент, обеспеченный (по Ф.И.) напротив цилиндра с заранее установленным промежутком в области, в которой разные по полярности магнитные полюса являются смежными друг с другом, для регулирования количества проявителя, переносимого на цилиндре. Магнитные полюса располагаются так, что составляющая кругового направления магнитной силы, действующая на магнитный ...

ПРОЯВОЧНОЕ УСТРОЙСТВО

Изобретение относится к проявочному устройству, установленному в устройстве формирования изображения. В проявочном устройстве, включающем в себя транспортирующие шнеки, которые, вращаясь, осуществляют циркуляцию проявителя и транспортируют его в контейнере проявителя, проявочную гильзу, которая, вращаясь, несет и транспортирует проявитель в контейнере проявителя, и ограничительный нож, который ограничивает количество проявителя у проявочной гильзы, контейнер проявителя включает в себя камеру подачи, предназначенную для подачи проявителя на проявочную гильзу, и камеру возврата, предназначенную для возврата проявителя с проявочной гильзы, а скорость вращения транспортирующих шнеков или скорость вращения проявочной гильзы изменяется таким образом, что отношение Vsc/Vsl в то время, когда формирование изображения не проводится, меньше, чем скорость вращения в то время, когда формирование изображения проводится, при этом Vsc обозначает скорость вращения транспортирующих шнеков, a Vsl обозначает ...

Переносящий проявитель элемент, проявочное устройство, технологический картридж и устройство формирования изображений

Изобретение относится к электрофотографическому устройству формирования изображений. Переносящий проявитель элемент включает вращательный вал и упругий слой, сформированный на внешней окружной поверхности вращательного вала, причем на поверхности упругого слоя переносится проявитель, при этом упругий слой выполнен так, что нагрузка на единицу площади участка контакта между одной поверхностью плоской стеклянной пластины и упомянутой поверхностью упругого слоя должна составлять 5,8 Н/мм2или более в состоянии, в котором упомянутая одна поверхность плоской стеклянной пластины параллельна осевому направлению вращательного вала и упомянутая одна поверхность плоской стеклянной пластины входит в контакт с упомянутой поверхностью упругого слоя с заданной степенью проникновения, и при этом средняя шероховатость Rzjis по десяти точкам на упомянутой поверхности упругого слоя больше среднего по объему диаметра частиц проявителя. Техническим результатом является подавление возникновения размытости изображения ...

ПРОЯВОЧНОЕ УСТРОЙСТВО

... 1. Проявочное устройство, содержащее:несущий проявитель элемент для переноса проявителя, содержащего магнитный носитель и немагнитный тонер, и для проявления электростатического скрытого изображения, образованного на переносящем изображение элементе;магнит, обеспеченный в упомянутом несущем проявитель элементе, и включающий в себя множество магнитных полюсов, расположенных вдоль кругового направления упомянутого несущего проявитель элемента, для переноса проявителя на упомянутом несущем проявитель элементе; ирегулирующий элемент, обеспеченный напротив упомянутого несущего проявитель элемента с заранее установленным промежутком в области, в которой разные по полярности магнитные полюса являются смежными друг с другом, для регулирования количества проявителя, переносимого на упомянутом несущем проявитель элементе,при этом магнитные полюса расположены так, что составляющая кругового направления магнитной силы, действующая на магнитный носитель, соприкасающийся по меньшей мере с частью расположенной ...

КАРТРИДЖ И БЛОК

... 1. Картридж, устанавливаемый с возможностью отсоединения на основной узел устройства формирования изображений, содержащий:вращающийся элемент;ножевой элемент, входящий в контакт с упомянутым вращающимся элементом;корпус, сформированный из полимерного материала, для поддержки упомянутого ножевого элемента; иуплотняющий элемент, обеспеченный на упомянутом корпусе, который должен входить в контакт с частью упомянутого ножевого элемента, расположенный напротив части, где упомянутый ножевой элемент входит в контакт с упомянутым вращающимся элементом, на оконечной стороне упомянутого ножевого элемента относительно направления оси упомянутого вращающегося элемента, причем упомянутый уплотняющий элемент сформирован на упомянутом корпусе посредством инжекционного формования для уплотнения промежутка между упомянутым ножевым элементом и упомянутым корпусом.2. Картридж по п. 1, в котором упомянутый уплотняющий элемент сформован с наклонной формой относительно направления оси.3. Картридж по п. 1, в ...

ПРОЯВОЧНОЕ УСТРОЙСТВО

Устройство для подачи проявителя на цилиндр со скрытым электростатическим изображением

BILDERZEUGUNGSGERÄT, BILDERZEUGUNGSVERFAHREN, ENTWICKLUNGSGERÄT UND ENTWICKLUNGSVERFAHREN

Bereitgestellt wird ein Entwicklungsgerät einschließlich Toner für die Entwicklung eines elektrostatischen latenten Bildes, ein Tonerträger für das Tragen des Toners und ein Regulierungselement für die Regulierung einer Schichtdicke des durch den Tonerträger getragenen Toners. Der Tonerträger wird angeordnet, um mit dem ein elektrostatisch latentes Bild tragenden Element in Kontakt gebracht zu werden. Der Tonerträger beinhaltet ein Substrat, eine elastische Schicht und eine Oberflächenschicht, die ein Urethanharz enthält. Das Urethanharz weist eine Teilstruktur auf, die aus einer Reaktion zwischen einer durch die Strukturformel (1) dargestellten Verbindung und einem Polyisocyanat stammt. Der Toner enthält Tonerteilchen, die jeweils ein Bindemittelharz und ein magnetisches Material enthalten, und anorganische Feinteilchen. Der Toner weist einen gewichtsmittleren Teilchendurchmesser (D4) von 9,5 µm bis 14,0 µm auf. Der Toner weist eine Porosität von 50 oder mehr und 56 oder weniger auf.

VORRICHTUNG ZUM ENTWICKELN ELEKTROSTATISCHER, LATENTER BILDER

ENTWICKLUNGSEINRICHTUNG

Developing blade and its manufacturing method

Method for adjusting a doctor gap of a development device in an electrophotographic printer

DEVELOPING APPARATUS

DEVELOPING APPARATUS

DEVELOPMENT EQUIPMENT WITH ADJUST-HURRY FOR THE DEVELOPER LAYER THICKNESS, CARTRIDGE AND IMAGING APPARATUS WITH SUCH AN EQUIPMENT

DEVELOPER LOAD DEVICE

IMAGING EQUIPMENT IS PUT ON WHEREBY A AC TENSION TO THE DEVELOPER ELEMENT

METHOD FOR ADJUSTING A DOCTOR GAP OF A DEVELOPMENT DEVICE IN AN ELECTROPHOTOGRAPHIC PRINTER

Compliant doctor blade surface having molybdenum disulfide

MULTI-ROLLER ELECTROSTATIC TONING

Compliant doctor blade

DEVELOPING DEVICE FOR XEROGRAPHIC COPYING MACHINES

Developing device and image forming apparatus provided therewith

MOUNTING SURFACES FOR WIPER BLADES

Developing device and image forming apparatus

Non-magnetic, single-element developing apparatus

Developing device and layer thickness regulating and controlling member

Developing device comprising the developing device and Image forming device

Developing device, image carrier device, and image forming apparatus

A layer-thickness regulating member includes a thin plate member and a projection member provided on a free edge portion of the thin plate member. A leak preventing members include a first seal member and a second seal member. The first seal member includes a first downstream portion disposed adjacent to the projection member on a front surface of the thin plate member, and a first upstream portion extending upstream of the first downstream portion. The second seal member includes a second downstream portion, and a second upstream portion which extends upstream of the second downstream portion. The second upstream portion includes a covered portion covered with the first upstream portion, an opposed portion disposed adjacent to the covered portion and opposed to the adjacent portion of the projection member and an exposed portion extending upstream of the covered portion and the opposed portion.

DEVICE OF DEVELOPMENT FOR APPARATUSES OF REPRODUCTION OF THE DRY TYPE

Device of development for electrophotographic system

L'invention concerne un dispositif de développement qui comporte un élément d'alimentation (26) mis en contact pressant avec un support de toner (32) qui présente une dureté supérieure à celle de l'élément d'alimentation et plus petite qu'une dureté prédéterminée. L'élément d'alimentation tourne dans le même sens que le support de toner pour effectuer le raclage du toner et l'alimentation en toner. Un élément de régulation (35) en forme de lame de ressort est appliqué contre le support de toner de façon à charger le toner suivant une polarité prédéterminée et à amincir le toner afin que celui-ci présente une ou deux couches.

METHOD FOR MANUFACTURING A MOLD AND A BLADE FOR ELECTROPHOTOGRAPHIC APPARATUS, CAPABLE OF SUSTAINING GOOD RELEASABILITY TO OBTAIN A BLADE MEMBER FOR ELECTROPHOTOGRAPHY OF HIGH PRECISION, AND DEVELOPER AMOUNT CONTROLLING BLADE

PURPOSE: A method for manufacturing a mold and a blade for electrophotographic apparatus is provided to maintain dimensional accuracy and surface properties of a blade member to high precision and form images of high definition, and a developer amount controlling blade manufactured by the same is provided. CONSTITUTION: A mold(30) comprises a maintaining layer formed on an inner peripheral surface(30a) of a mold body, and a releasing layer formed on an inner peripheral surface of the maintaining layer. A main chain of the releasing layer is formed of a polysilazane or polysiloxane-based addition type two component liquid silicone. The releasing layer comprises 0.5 wt.% or less of a component volatilizing at a hardening temperature of the liquid elastomer raw material. The releasing layer comprises 1 wt.% or less of silica(SiO2). The releasing layer has a hardness satisfying an international rubber hardness of not greater than 50 to 85 degrees. The releasing layer comprises a solid lubricant ...

DEVELOPING UNIT FOR AN IMAGE FORMING APPARATUS, CAPABLE OF IMPROVING REGULATION PERFORMANCE OF A REGULATION MEMBER

PURPOSE: A developing unit for an image forming apparatus is provided to prevent deformation of a regulation member due to a developer leaked between a sealing member and the regulation member by gradually increasing the width of the regulation member from the bending unit to rear side. CONSTITUTION: A developer container is formed on a frame. A developing unit is installed on the frame rotatable. The developing unit supplies developer to a photosensitive member of the image forming device. A regulation member(170) regulates a developer layer of the developing unit. The regulation member comprises a bending part(172) contacting the outer circumference of the developer unit. The width of the regulation member is gradually increased from the bending unit to the rear side. COPYRIGHT KIPO 2010 ...

DEVELOPING SYSTEM

DEVELOPER STATION WITH SMOOTHING DEVICE AND METHOD FOR OPERATING A DEVELOPER STATION

A developer station and a method for operating a developer station are described, wherein toner particles are fed to a rotating developer roller (12). A smoothing device (34) with a smoothing element (38) is arranged in front of a transfer zone (30). The smoothing element (34) is mechanically pretensioned and exerts a pressure over the entire width of the toner layer, due to which the layer is smoothed with toner particles before the transfer of the toner particles onto an additional roller (28).

ONE-COMPONENT DEVELOPMENT STATION

The invention relates to a device and method for developing an electrostatic latent image located on a movable image carrier (1) using a non-conductive one-component toner. Said device comprises a toner supply unit (3) for delivering toner particles (5) from a toner reservoir (4) and electrically charging them; a rotating developing drum (2) which receives the charged toner particles from the toner supply unit and transports the received toner particles to a slot between the developing drum and the image carrier; and a dosing unit generating a layer thickness, which unit is positioned along the route of the toner particles from the toner supply unit to the image carrier and produces a uniform toner layer having a defined thickness and charge on the developing drum. The invention also provides for other means for rendering the toner layer homogeneous in terms of layer thickness and charge.

SYSTEM AND METHOD FOR MINIMIZING RESIDUAL CHARGE EFFECTS IN A PRINTING DEVICE

A development unit for a printing device is described. An equalizing element (60) is provided to minimize residual charges which cause ghosting. The equalizing element (60) can, for example, be a roller or a blade positioned downstream of a cleaning nip between the cleaning roller (46) and the development roller (32) and charged to an electric potential which is substantially the same as an electric potential of the development roller (32). The equalizing element (60) can alternatively, or in addition to being charged to perform equalization, operate to aid in charge residual charge dissipation on the development roller (32) by blocking developer from reaching the development roller (32) downstream of the cleaning roller (46).

Apparatus and method for removing foreign materials lodged inside an image forming system

The invention provides image forming method and apparatus. One embodiment of the invention is an image forming apparatus with a developing device. This apparatus also includes: (1) an electrostatic latent image carrier on which an electrostatic latent image is formed, (2) a developing roller rotatably driven in a first direction during developing, (3) a developing-roller-reverse rotator which rotates the developing roller in a second direction opposite the first direction, when the developing device moves with respect to the electrostatic latent image carrier. Another embodiment is an image forming apparatus that also includes a developer-regulating member positioned in direct contact with or close proximity to the developing roller. In this embodiment, the rotation of the developing roller in the second direction dislodges materials stuck between the developing roller and the developer-regulating member. Yet another embodiment of the invention an image forming apparatus that also includes ...

Conductive rubber composition and process for the production thereof

Conductive rubber compositions comprising a vulcanizate of a rubber component (A), a rubber component (B) vulcanized by a mechanism different from that in the rubber component (A), and conductive particles, a production process thereof, conductive rubber members making use of such a conductive rubber composition, a production process of the conductive rubber members, conductive rubber-covered rolls, and image forming apparatus equipped with the conductive rubber-covered roll are provided.

Developer regulator, development device, and image forming apparatus incorporating same

A developer regulator to restrict an amount of a developer, including a base portion; an intermediate portion continuous with the base portion, the intermediate portion having a flat area on one face, the flat area having a roughened surface; and a distal end continuous with the intermediate portion, the distal end being bent relative to the base portion in a direction opposite the one face in which the flat area is formed.

Developing device and image forming apparatus including developing device

A developing device includes: a developer holding body including: a hollow development rotary body which is opposed to an image holding body capable of holding a toner image and has a smooth surface whose surface roughness is lower than or equal to 5 μm in terms of maximum height; and a magnet member which is fixedly housed in the development rotary body and in which a plurality of magnetic poles are arranged alongside its periphery, the developer holding body operating in such a manner that developer containing toner and carrier is held on the development rotary body by magnetic force produced by the magnetic poles of the magnet member as the development rotary body is rotated; a layer regulating rotary body as defined herein; and a development driving device as defined herein.

Process Cartridge, Image Forming Apparatus and Developing Cartridge

A process cartridge, which includes a developing cartridge and a photosensitive cartridge for use with an image forming apparatus including a driving force output part and a feeding part, is provided. The developing cartridge includes a developer carrier, a first electrode provided at one side thereof, and a driving force receiving part provided at another side thereof and aligned with the first electrode such that the driving force receiving part overlaps the first electrode in a side view. The photosensitive cartridge, to which the developing cartridge is removably mounted, includes a photosensitive member, and a second electrode that contacts the first electrode when the developing cartridge is mounted in the photosensitive cartridge and that contacts the feeding part when the photosensitive cartridge is mounted in the image forming apparatus. The first electrode is pressed toward the driving force receiving part by contact with the second electrode.

Rotatable member cleaner for electrophotographic printer

In an electrophotographic (EP) printer, a rotatable member includes a deposition area and a non-deposition area. A toner supply supplies toner to the member, and a moving receiving member receives from the deposition area of the rotatable member while the rotatable member rotates. The rotatable member is cleaned with a selectively-retractable blade in mechanical contact with the member so that toner is removed from the deposition area while the rotatable member rotates. An artifact sensor automatically detects a toner image artifact on the receiver. A controller responsive to the artifact sensor causes the blade to retract when an artifact is detected, and a blade cleaner cleans the blade while the blade is not in mechanical contact with the member.

Regulating member, developing device and process cartridge

A regulating member for regulating a developer amount carried on a developer carrying member includes a plate-like supporting member having an elasticity, the supporting member being provided with a fixed portion for being fixed to a fixed part; a first contact portion contactable to the developer carrying member, the first contact portion protruding from the regulating member from a side of the supporting member; and a second contact portion contactable to and the developer carrying member, the second contact portion being at a position closer to the fixed portion than the first contact portion.

Developing Device Provided with Thickness-Regulating Member

A developing device includes: a first frame; a second frame; a developer-carrying member; and a thickness-regulating member. The first frame includes: a pair of first walls opposed with each other; and a second wall connecting the pair of first walls and having a first fixing part. The second frame includes a third wall opposed to the second wall and attached to the pair of first walls when assembled to the first frame. The developer-carrying member has an axis extending in a first direction, is configured to rotate about the axis, and is disposed between the pair of first walls. The thickness-regulating member is fixed to the first fixing part and is configured to regulate a thickness of developer carried on the developer-carrying member. The third wall is disposed between the second wall and the thickness-regulating member.

Image forming apparatus and image forming system

An image forming apparatus includes a developer bearing member configured to bear a developer to develop a latent image, a developer regulating member configured to regulate an amount of the developer carried on the bearing member, a voltage application unit that can apply a plurality of direct current voltages of different values between the bearing member and the regulating member, and a current detection unit that can detect a plurality of direct currents of different values flowing in the regulating member when the voltage application unit applies the plurality of direct current voltages, wherein the image forming apparatus sets a direct current voltage value Vb applied by the voltage application unit when developing the latent image, so that the following expression is satisfied: |Vb|>|Vbmin|, where Vbmin indicates a direct current voltage value when the direct current detected by the current detection unit is a minimum value.

Developing Device for Preventing Toner Leakage

A developing device is capable of preventing developing agent from leaking from a developing frame of a developer cartridge. The developer cartridge includes a developing agent carrying member, a layer thickness regulator, and a first seal positioned between the developing agent carrying member and the layer thickness regulator. The regulator includes a plate member provided with a projecting portion. The projecting portion has a laterally outer end portion positioned inward of laterally outer end portion of the first seal. 1. A developing device comprising:a frame for accommodating therein a developing agent;a developing agent carrying member having an outer peripheral surface and defining an axis, and configured to carry the developing agent on the outer peripheral surface, the developing agent carrying member being rotatable about the axis, the axis defining an axial direction, and the developing agent carrying member having an axial end portion; a first plate member having one end portion provided with a contact portion in contact with the developing agent carrying member and having another end portion supported to the frame; and', 'a second plate member positioned in confrontation with the frame to nip the another end portion of the first plate member between the second plate member and the frame for fixing the first plate member to the frame, a particular direction from the another end portion to the one end portion being coincident with a direction of rotation of the developing agent carrying member at a contacting portion between the contact portion and the developing agent carrying member, the second plate member having end portions in the axial direction; and, 'a layer thickness regulator provided at the frame and configured to regulate a thickness of a layer of the developing agent carried on the outer peripheral surface, the layer thickness regulator comprisinga pair of first seals each positioned between the axial end portion of the developing agent ...

Cartridge and unit

A cartridge detachably mountable to a main assembly of an image forming apparatus, includes: a rotatable member; a blade member contacted to the rotatable member; a frame, formed of a resin material, for supporting the blade member; and a seal member provided on the frame to be contacted to a portion of the blade member, opposite from a portion where the blade member is contacted to the rotatable member, in each of one end side and anther end side of the blade member with respect to an axial direction of the rotatable member, wherein the seal member is formed on the frame by injection molding for sealing a gap between the blade member and the frame.

DEVELOPING CONTAINER, METHOD OF MANUFACTURING THE SAME, DEVELOPING DEVICE USING THE SAME, AND IMAGE FORMING APPARATUS

A developing container configured to contain developer, the developing container including: a filter member which covers a communicating hole through which an inside and an outside of the developing container are communicated with each other; a fixing area where the filter member is fixed to the developing container; and a vibration regulating portion configured to regulate vibrations of the filter member on an inner side of the fixing area, wherein the filter member is configured to allow passage of air and regulate passage of the developer, and wherein the vibration regulating portion is provided so as to be hit by the filter member if the filter member is vibrated, in order to regulate the vibrations of the filter member. 1. A developing container configured to contain developer , the developing container comprising:a filter member which covers a communicating hole through which an inside and an outside of the developing container are communicated with each other;a fixing area where the filter member is fixed to the developing container; anda vibration regulating portion configured to regulate vibrations of the filter member on an inner side of the fixing area,wherein the filter member is configured to allow passage of air and regulate passage of the developer, andwherein the vibration regulating portion is provided so as to be hit by the filter member if the filter member is vibrated, in order to regulate the vibrations of the filter member.2. A developing container according to claim 1 , wherein the vibration regulating portion comprises a beam structure.3. A developing container according to claim 1 , wherein the communicating hole is divided into a plurality of sections by the vibration regulating portion.4. A developing container according to claim 2 , wherein one end of the beam structure comprises a free end.5. A developing container according to claim 1 , wherein the vibration regulating portion is provided so as to be hit by a center of the filter member ...

Developing device, process cartridge and drum unit

A developing device for use with an image forming apparatus, includes: a developer carrying member for carrying a developer; a developer regulating member for regulating an amount of the developer carried on the developer carrying member; a first frame for supporting the developer regulating member; a fixing member for fixing the developer regulating member to the first frame; a second frame mounted to the first frame; and a molded resin portion formed by injecting a melted resin material into a space defined by the first and second frames. The molded resin portion is engaged with a first limiting portion provided as a part of the fixing member and projected into the space and is engaged with a second limiting portion provided as a part of the second frame to connect the first and second frame.

DOCTOR BLADE FOR IMAGE FORMING DEVICE

A doctor blade of an image forming device for controlling a thickness of a toner coated on a development roller to a uniform thickness inside the image forming device is disclosed. The doctor blade includes: a support rod serving as a support fixture; a plate formed in an L shape, the plate being mounted on the lower surface and the rear surface of the support rod in contact with them to thereby serve to keep a uniform thickness of the toner in a state where the bottom surface is in contact with the development roller, the plate including a base layer of a metallic material and a coated layer formed on the bottom surface of the base layer getting in contact with the development roller; and a torsion spring mounted above the support rod to pressurize the support rod and the plate in order to fix the support rod and the plate. The doctor blade is reusable because only the plate is simply replaced with a new one when the coated layer formed on the plate is worn out. 1. A doctor blade of an image forming device for controlling a thickness of a toner coated on a development roller to a uniform thickness inside the image forming device , the doctor blade comprising:a support rod serving as a support fixture;a plate formed in an L shape, the plate being mounted on the lower surface and the rear surface of the support rod in contact with them to thereby serve to keep a uniform thickness of the toner in a state where the bottom surface is in contact with the development roller, the plate including a base layer of a metallic material and a coated layer formed on the bottom surface of the base layer getting in contact with the development roller; anda torsion spring mounted above the support rod to pressurize the support rod and the plate in order to fix the support rod and the plate.2. The doctor blade according to claim 1 , wherein a plurality of the torsion springs are mounted at several positions.3. The doctor blade according to claim 1 , wherein the support rod is made of ...

Developing apparatus and developing method

An object of the present invention is to provide a developing apparatus which is less affected by usage environments, has high development efficiency for long term use and can provide a high quality image without image density non-uniformity. The present invention relates to a developing apparatus wherein a magnetic toner-carrying member has a work function value at the surface thereof within a specific range, a toner regulating member which regulates toner carried on the magnetic toner-carrying member is made of a specific material at a portion contacting the magnetic toner, the magnetic toner has an average circularity of 0.950 or more and the magnetic toner has a surface tension index within a specific range.

Bias Member for the Doctor Blade of the Developer Unit in an Imaging Device

A doctor blade assembly for the developer unit of an electrophotographic imaging system. The doctor blade assembly includes a blade member having a first longitudinal edge for contacting a developer roll of an imaging system; a bracket member operatively connected to the blade member; and at least one bias member having a first end portion along a first longitudinal end portion of the bracket member and a second end portion contacting a distal portion of the blade member so as to present a force thereon. The force presented by the bias member serves as a counterforce to at least partly offset a force presented on the doctor blade and developer roll by a seal member of the developer unit. 1. A removable unit for an electrophotographic imaging device , comprising:a housing;a rotatable roll disposed within the housing;at least one seal member coupled within the housing along the at least one side thereof, a portion of the at least one seal member engaging an end portion of the rotatable roll so as to prevent toner from leaking from the housing; anda blade assembly coupled to the housing, comprising a support bracket secured to the housing, a blade member coupled to the support bracket and being positioned so that a distal end thereof is disposed between and engages with the rotatable roll and the at least one seal member, and at least one bias member having a first end portion disposed in a substantially stable position within the housing and a second end portion which engages with the blade member so as to present a force that at least partly offsets a force presented to the blade member by the at least one seal member.2. The removable unit of claim 1 , wherein the at least one bias member comprises a spring member.3. The removable unit of claim 1 , wherein the support bracket includes a first surface against which the blade member is coupled claim 1 , and the first end portion of the at least one bias member is disposed along the first surface of the support bracket. ...

Developing Device Having Thickness Regulation Blade

A developing device includes: a casing; a developing roller rotatably supported to the casing; a resiliently deformable blade supported to the casing and extending in an axial direction of the developing roller; and a regulation portion. The developing roller is rotatable in a rotational direction and to carry a layer of developer thereon. The blade has a first surface facing the developing roller. The regulation portion is configured to be in contact with the developing roller to regulate a thickness of the layer of the developer. The blade is formed with a through-hole to allow a material of the regulation portion to pass therethrough to form the regulation portion, the through-hole being exclusively formed in a central area in the axial direction assuming that the blade were divided into three areas each having an identical length in the axial direction with each other. 1. A developing device comprising:a casing;a developing roller rotatably supported to the casing and defining an axis extending in an axial direction, the developing roller being configured to rotate in a rotational direction and to carry a layer of developer thereon;a resiliently deformable blade supported to the casing and extending in the axial direction, the blade having a first surface facing the developing roller; anda regulation portion configured to be in contact with the developing roller to regulate a thickness of the layer of the developer carried on the developing roller,wherein the blade is formed with a through-hole to allow a material of the regulation portion to pass therethrough in order to form the regulation portion on the blade, the through-hole being exclusively formed in a central area in the axial direction assuming that the blade were divided into three areas having a length in the axial direction equal to each other.2. The developing device as claimed in claim 1 , wherein the regulation portion is provided on the first surface at a downstream side thereof in the rotational ...

Developing Device Having Thickness Regulation Blade

A developing device includes: a casing; a developing roller rotatably supported to the casing; a resiliently deformable blade supported to the casing; a regulation portion; and a covering portion. The developing roller is rotatable in a rotational direction and carries a layer of developer thereon. The blade extends in an axial direction of the developing roller and has one axial end portion formed with a through-hole, the blade having a first surface facing the developing roller and a second surface opposite to the first surface. The regulation portion is configured to be in contact with the developing roller to regulate a thickness of the layer of the developer carried on the developing roller. The covering portion is provided on the second surface and positioned to cover the through-hole. 1. A developing device comprising:a casing;a developing roller rotatably supported to the casing and defining an axis extending in an axial direction, the developing roller being configured to rotate in a rotational direction and to carry a layer of developer thereon;a resiliently deformable blade supported to the casing and extending in the axial direction, the blade having a first surface facing the developing roller and a second surface opposite to the first surface, the blade having one axial end portion formed with a through-hole;a regulation portion configured to be in contact with the developing roller to regulate a thickness of the layer of the developer carried on the developing roller; anda covering portion provided on the second surface and positioned to cover the through-hole.2. The developing device as claimed in claim 1 , wherein the regulation portion is provided on the first surface of the blade at a downstream side thereof in the rotational direction.3. The developing device as claimed in claim 1 , wherein the through-hole allows a material of the regulation portion to pass therethrough in order to form the regulation portion; andwherein the regulation portion ...

DEVELOPER CARRYING MEMBER, PROCESS FOR ITS PRODUCTION, AND DEVELOPING ASSEMBLY

A developer carrying member is provided the surface layer of which can make a developer stable by controlling its triboelectric charging strongly and which can maintain a high image quality over a long period of time even where a developer made highly spherical-particle or a small-particle developer is used. The developer carrying member has a substrate and a surface layer. The surface layer is a cured product of a resin composition containing a binder resin, conductive particles, a quaternary ammonium salt and an azo metal complex compound, the binder resin has in the molecular structure at least one structure selected from the group consisting of an —NHgroup, an ═NH group and an —NH— linkage, and the azo metal complex compound is a compound represented by the formula () as defined in the specification. 3. A developing assembly comprising:a negatively chargeable developer,a developer container in which the negatively chargeable developer is held,a developer carrying member which is supported rotatably, and carries and transports the negatively chargeable developer thereon supplied from the developer container, anda developer layer thickness regulating member for regulating the layer thickness of a negatively chargeable developer layer formed on the developer carrying member;wherein,{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'the developer carrying member is the developer carrying member according to .'}4. The developing assembly according to claim 3 , wherein;the developer is a magnetic one-component developer;a magnet is provided in the interior of the developer carrying member; andthe developer layer thickness regulating member is a magnetic blade.5. The developing assembly according to claim 3 , wherein;the developer is a magnetic one-component developer;a magnet is provided in the interior of the developer carrying member; andthe developer layer thickness regulating member is an elastic blade.6. The developing assembly according to claim 3 , wherein;the ...

DEVELOPING DEVICE AND IMAGE FORMING APPARATUS

A developing device including: a toner bearing member configured to bear a toner on a surface of the toner bearing member and configured such that the surface thereof is rotated to supply the toner to and develop a latent electrostatic image on a surface of a latent electrostatic image bearing member in a developing region which faces the latent electrostatic image bearing member; and a regulating member configured to regulate an amount of the toner to be moved towards the developing region, wherein the surface of the toner bearing member has regularly arranged convex portions, and wherein a non-electrostatic adhesive force between the toner and the surface of the toner bearing member is less than 9.0 nN. 1. A developing device comprising:a toner bearing member configured to bear a toner on a surface of the toner bearing member and configured such that the surface thereof is rotated to supply the toner to and develop a latent electrostatic image on a surface of a latent electrostatic image bearing member in a developing region which faces the latent electrostatic image bearing member; anda regulating member configured to regulate an amount of the toner to be moved towards the developing region,wherein the surface of the toner bearing member has regularly arranged convex portions, andwherein a non-electrostatic adhesive force between the toner and the surface of the toner bearing member is less than 9.0 nN.2. The developing device according to claim 1 ,wherein the toner is obtained by treating toner base particles with silica and titanium oxide serving as external additives.3. The developing device according to claim 1 ,wherein the toner is obtained by treating toner base particles with oil-treated silica serving as an external additive, andwherein the toner comprises the oil-treated silica in an amount of 1.4 parts by mass to 2.8 parts by mass per 100 parts by mass of the toner base particles.4. The developing device according to claim 1 ,wherein the toner has a ...

DEVELOPMENT DEVICE AND IMAGE FORMING APPARATUS INCORPORATING SAME

A development device includes a developer bearer to carry by rotation developer to a development range facing a latent image bearer, and a developer regulator to adjust an amount of developer transported to the development range by the developer bearer. Multiple projections are formed in a surface of the developer bearer, and the developer bearer rotates in a reverse direction to a direction of rotation for image development while image development is not performed. The developer regulator includes a blade having a first end held by a regulator holder and a second end that contacts the multiple projections formed in the surface of the developer bearer and is disposed in a direction counter to the direction of rotation of the developer bearer for image development. 1. A development device comprising:a developer bearer to carry by rotation developer to a development range facing a latent image bearer; anda developer regulator to adjust an amount of developer transported to the development range by the developer bearer,wherein multiple projections are formed in a surface of the developer bearer, and the developer bearer rotates in a reverse direction to a direction of rotation for image development while image development is not performed, andthe developer regulator comprises a blade having a first end held by a regulator holder and a second end that contacts the multiple projections formed in the surface of the developer bearer, the second end disposed in a direction counter to the direction of rotation of the developer bearer for image development.2. The development device according to claim 1 , wherein the developer bearer rotates in the reverse direction immediately after image development is completed.3. The development device according to claim 1 , wherein an edge on a second end side of the blade contacts the developer bearer.4. The development device according to claim 1 , wherein the surface of the developer bearer is made of metal.5. The development device ...

DEVELOPER CARRYING MEMBER, PROCESS FOR ITS PRODUCTION, AND DEVELOPING ASSEMBLY

A developer carrying member is provided which can maintain a high image quality over a long period of time even where a highly triboelectrically chargeable developer is used. The developer carrying member has a substrate and a surface layer. The surface layer is a cured product of a resin composition containing a binder resin, conductive particles, a quaternary phosphonium salt and an azo metal complex compound, the binder resin has in the molecular structure at least one structure selected from the group consisting of an —NHgroup, an ═NH group and an —NH— linkage, and the azo metal complex compound is a compound represented by the formula (1) as defined in the specification. 4. A developing assembly which comprises a negatively chargeable developer , a developer container in which the negatively chargeable developer is held , a developer carrying member supported rotatably which carries and transports the negatively chargeable developer thereon , and a developer layer thickness regulating member for controlling the layer thickness of a negatively chargeable developer layer formed on the developer carrying member;{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'the developer carrying member being the developer carrying member according to .'}6. The developing assembly according to claim 4 , wherein;the developer is a magnetic one-component developer;a magnet is provided in the interior of the developer carrying member; andthe developer layer thickness regulating member is an elastic blade.7. The developing assembly according to claim 4 , wherein;the developer is a non-magnetic one-component developer; andthe developer layer thickness regulating member is an elastic blade. This application is a continuation of International Application No. PCT/JP2012/006988, filed Oct. 31, 2012, which claims the benefit of Japanese Patent Application No. 2011-239223, filed Oct. 31, 2011.1. Field of the InventionThis invention relates to a developer carrying member used in image- ...

DEVELOPMENT DEVICE, AND IMAGE FORMING APPARATUS AND PROCESS CARTRIDGE INCORPORATING SAME

A development device includes a developer bearer to carry by rotation developer to a development range facing a latent image bearer and a developer regulator to adjust an amount of developer transported to the development range by the developer bearer. The developer bearer includes a developer carrying range having surface unevenness; and a surface of the developer bearer is coated with a coating material including a resin material and particles to roughen the surface. 1. A development device comprising:a developer bearer to carry by rotation developer to a development range facing a latent image bearer, the developer bearer including a developer carrying range having surface unevenness; anda developer regulator to adjust an amount of developer transported to the development range by the developer bearer,wherein a surface of the developer bearer is coated with a coating material including a resin material and particles to roughen the surface.2. The development device according claim 1 , wherein the particles to roughen the surface comprise acrylic beads.3. The development device according claim 1 , wherein conductive particles are added to the coating material.4. The development device according claim 1 , wherein multiple projections and multiple recesses are formed in the surface of the developer bearer claim 1 , forming the surface unevenness claim 1 , andthe developer regulator comprises a blade having a first end held by a regulator holder and a second end that contacts the multiple projections formed in the surface of the developer bearer.5. The development device according claim 4 , wherein the blade of the developer regulator is constructed of a metal material.6. The development device according claim 5 , wherein the developer regulator further comprises an opposed face facing the developer bearer and an end face on a second end side claim 5 , andthe second end that contacts the surface of the developer bearer is a linear portion where a virtual plane ...

DEVELOPMENT DEVICE, AND IMAGE FORMING APPARATUS AND PROCESS CARTRIDGE INCORPORATING SAME

A development device includes a developer bearer to carry by rotation developer to a development range facing a latent image bearer, and a developer regulator to adjust an amount of developer transported to the development range by the developer bearer. Multiple projections are formed in a surface of the developer bearer, and, in a direction in which the developer bearer rotates, a downstream end of each of the multiple projections is higher than an upstream end of the projection. 1. A development device comprising:a developer bearer to carry by rotation developer to a development range facing a latent image bearer; anda developer regulator to adjust an amount of developer transported to the development range by the developer bearer,wherein multiple projections are formed in a surface of the developer bearer, andin a direction in which the developer bearer rotates, a downstream end of each of the multiple projections is higher than an upstream end of the projection.2. The development device according to claim 1 , wherein the developer regulator comprises a blade having a first end held by a regulator holder and a second end that contacts the multiple projections formed in the surface of the developer bearer.3. The development device according to claim 2 , wherein the developer regulator is constructed of a metal material.4. The development device according claim 3 , wherein the developer regulator further comprises an opposed face facing the developer bearer and an end face on a second end side claim 3 , andthe second end that contacts the surface of the developer bearer is a linear portion where a virtual plane extending along the opposed face crosses a virtual plane extending along the end face on the second end side of the developer regulator.5. The development device according claim 3 , wherein an edge on a second end side of the blade contacts the developer bearer.6. The development device according claim 3 , wherein a corner portion on a second end side of the ...

DEVELOPMENT DEVICE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS

An image forming apparatus is provided which includes a development device that has no developer supply member and with which the decrease in density at a back end of a solid image and occurrence of ghosting are suppressed. A development roller having dielectric portions scattered on a surface thereof is provided and components are configured so that the position of the dielectric portions in a triboelectric series is on the same polarity side, relative to a regulating blade, as the normal charge polarity of the toner. 1. A development device comprising a container that contains a toner , a toner bearing member that has dielectric portions scattered on a surface thereof and bears the toner , and a regulating member that regulates a layer thickness of the toner on the toner bearing member ,wherein a position of the dielectric portions in a triboelectric series is on the same polarity side, relative to the regulating member, as a normal charge polarity of the toner than the regulating member.2. The development device according to claim 1 ,wherein the toner bearing member has protrusions on the surface andthe dielectric portions are present in the protrusions.3. The development device according to claim 2 , wherein a ten point average roughness Rzjis of the surface of the toner bearing member and an average particle diameter r of the toner satisfy r≦Rzjis.4. The development device according to claim 2 , wherein a ten point average roughness Rzjis of the surface of the toner bearing member and an average particle diameter r of the toner satisfy Rzjis≦3r.5. The development device according to claim 1 , further comprising an external additive externally added to a surface of the toner claim 1 , a position of the external additive in the triboelectric series being on the polarity side claim 1 , relative to the dielectric portions claim 1 , opposite to the normal charge polarity of the toner claim 1 ,wherein the dielectric portions are charged to the same polarity as the ...

DEVELOPING APPARATUS

In the case where V-groove portions in a surface of a developing sleeve are located in the closest position between the developing sleeve and a regulating blade, an angle θ formed by a slope surface of the regulating blade with a downstream surface of a V-groove in a rotation direction of the developing sleeve is set to less than 90°. 1. A developing apparatus , comprising:a developer carrying member configured to carry a developer to a developing region opposing an image bearing member, the developer carrying member having a surface provided with a plurality of grooves;a regulating member configured to regulate an amount of the developer carried by the developer carrying member;a slope portion provided on the regulating member in an opposing portion in which the regulating member opposes the surface of the developer carrying member, the slope portion being sloped so that a gap between the slope portion and the developer carrying member is narrowed toward a downstream side in a rotation direction of the developer carrying member; anda downstream slope surface provided on the downstream side in the rotation direction of the developer carrying member within a region of each of the plurality of grooves, the downstream slope surface being sloped with respect to a normal direction of the developer carrying member,wherein, when a downstream end of the downstream slope surface and a downstream end of the slope portion of the regulating member are located in a closest position, the downstream slope surface and the slope portion of the regulating member form an angle θ less than 90°.2. A developing apparatus according to claim 1 , comprising an upstream slope surface provided within the region of each of the plurality of grooves claim 1 , the upstream slope surface being sloped with respect to the normal direction of the developer carrying member on an upstream side in the rotation direction of the developer carrying member claim 1 , andwherein an angle formed by the slope ...

DEVELOPMENT DEVICE AND IMAGE FORMING APPARATUS AND PROCESS UNIT INCORPORATING SAME

A development device includes a developer bearer to carry developer thereon and receive a development bias and a developer regulator to adjust an amount of developer carried on the developer bearer. Multiple recesses recessed from a reference surface area are formed in a surface of the developer bearer, the developer bearer includes a conductive base in which the recesses are formed, and the conductive base in the reference surface area is coated with an insulative surface layer. 1. A development device comprising:a developer bearer to carry developer thereon and receive a development bias, the developer bearer having a surface in which multiple recesses recessed from a reference surface area are formed; anda developer regulator to adjust an amount of developer carried on the developer bearer,wherein the developer bearer includes a conductive base in which the recesses are formed, and the conductive base in the reference surface area is coated with an insulative surface layer.2. The development device according to claim 1 , wherein claim 1 , a solid surface of the conductive base of the developer bearer is exposed at positions of the recesses.3. The development device according to claim 1 , wherein claim 1 , in a direction in which the developer bearer rotates claim 1 , a contact portion between the developer regulator and the developer bearer has a length greater than a length of the recess.4. The development device according to claim 1 , further comprising a rotary developer supply member including a conductive surface claim 1 ,wherein the developer supply member supplies developer carried on the conductive surface thereof to the developer bearer in a contact area between the developer supply member and the developer bearer.5. The development device according to claim 1 , wherein the multiple recesses of the developer bearer have a similar depth from the reference surface area of the developer bearer.6. The development device according to claim 1 , wherein the ...

DEVELOPING DEVICE

According to one embodiment, a developing device includes a developer carrier arranged opposite to an image carrier on which an electrostatic latent image is formed and configured to supply toner for the electrostatic latent image and a toner layer regulating member configured to be pressed against the developer carrier to regulate the thickness of a toner layer on the developer carrier and the pressured surface of the developer carrier can be moved. 1. A developing device , comprising:a developer carrier arranged opposite to an image carrier on which an electrostatic latent image is formed and configured to supply toner for the electrostatic latent image; anda toner layer regulating member configured to be pressed against the developer carrier to regulate the thickness of a toner layer on the developer carrier and the pressured surface of the developer carrier can be moved.2. The developing device according to claim 1 , whereinthe toner layer regulating member includes a pressing member, andthe sheet member is pressed against the developer carrier by the pressing member.3. The developing device according to claim 1 , whereinthe toner layer regulating member includes a sheet member supplying shaft and a sheet member rolling shaft,the sheet member rolled on the sheet member supplying shaft is wound onto the sheet member rolling shaft to move the pressed surface.4. The developing device according to claim 1 , whereinthe movement speed of the sheet member is lower than that of the developer carrier.5. The developing device according to claim 1 , whereinthe toner is a single-component nonmagnetic toner.6. An image forming apparatus claim 1 , includes an image carrier and a developing device for supplying toner to an electrostatic latent image formed on the image carrier claim 1 , whereinthe developing device includes:a developer carrier configured to supply toner to the electrostatic latent image; anda toner layer regulating member configured to be pressed against the ...

Cartridge

A cartridge includes: a housing that has a first wall part and a second wall part arranged at an interval from the first wall part and is configured to accommodate developer; a developer carrier that is rotatably supported to the housing and carries the developer; a layer thickness regulation member that is supported to the housing so that it is arranged at an opposite side to the second wall part with respect to the first wall part and that is configured to regulate a layer thickness of the developer carried on a surface of the developer carrier, and a covering member that is arranged at an opposite side to the second wall part with respect to the layer thickness regulation member and covers the layer thickness regulation member, wherein the covering member has a grip to grip the housing.

DEVELOPING DEVICE AND IMAGE FORMING APPARATUS

A developing device includes a developing sleeve, a magnet roller mounted in the developing sleeve, a first conveying screw feeding a developer to the developing sleeve, and a regulating blade regulating a layer thickness of the developer. The developing device further includes a guide member that backs up the developer from the first conveying screw at an upstream side of the regulating blade based on a rotational direction of the developing sleeve and that forms a buffer portion temporarily containing the developer between the regulating blade and the guide member. The guide member is installed so that a direction of a resultant force of a magnetic force and a gravitational force acting on a carrier particle becomes a direction away from a surface of the guide member on a facing surface of the guide member which is opposite to the regulating blade. 1. A developing device comprising:a developer carrier which carries a developer containing a toner and a carrier;a magnet installed inside the developer carrier and includes a plurality of magnetic poles in a rotational direction of the developer carrier;a developing chamber which feeds the developer to the developer carrier;a conveying member which conveys the developer of the developing chamber;a regulating member which regulates an amount of the developer coated on the developer carrier; anda backup portion which forms a side of the developing chamber between the regulating member and the conveying member and forms a buffer portion that temporarily contains the developer fed from the developing chamber between the regulating member and the backup portion,wherein, to guide the developer from a top of the backup portion to a position facing the developer carrier, the backup portion includes a guide portion inclined downward from the top, and the plurality of magnetic poles is installed so that a direction of a magnetic force acting on the carrier above the guide portion becomes a direction in which the carrier is ...

DEVELOPING DEVICE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS

A developing device including a containing unit configured to be arranged below a supply member and contain a developer and a developer bearing member configured to bear the developer and develop an electrostatic latent image, further includes a supply member which is configured to supply the developer to the developer bearing member, to be arranged to form a nip portion between the supply member and the developer bearing member, and to rotate in a direction in which its surface moves from an upper end to a lower end of the nip portion, and a conveyance member which is configured to convey the developer contained in the containing unit onto the supply member. 1. A developing device used in an electrophotographic image forming apparatus , the developing device comprising:a developer bearing member configured to bear a developer and develop an electrostatic latent image;a supply member configured to supply the developer to the developer bearing member, to be arranged to form a nip portion between the supply member and the developer bearing member, and to rotate in a direction in which its surface moves from an upper end to a lower end of the nip portion;a containing unit configured to be arranged below the supply member and contain the developer; anda conveyance member configured to convey the developer contained in the containing unit onto the supply member.2. The developing device according to claim 1 , wherein the developer bearing member rotates in a direction in which its surface moves from the upper end to the lower end of the nip portion.3. The developing device according to claim 2 , wherein a peripheral speed of the supply member is higher than a peripheral speed of the developer bearing member.4. The developing device according to claim 1 , wherein the developer bearing member and the supply member are arranged so that an upper end of the supply member becomes higher than an upper end of the developer bearing member.5. The developing device according to ...

DEVELOPING APPARATUS AND PROCESS CARTRIDGE

A developing apparatus, including: a developer carrying member; a developer feeding member configured to feed the developer to the developer carrying member in abutment with the developer carrying member; and a developer regulating member having a distal end portion directed toward an upstream side in a rotation direction of the developer carrying member, and configured to regulate a layer thickness of the developer on the developer carrying member in abutment with a surface thereof. Surfaces of the developer carrying member and the developer feeding member move in the same direction in an abutment portion. The distal end portion of the developer regulating member has a developer taking-in portion away from the surface of the developer carrying member toward the upstream side in the rotation direction. The developer taking-in portion is positioned upstream of an abutment position between the developer regulating member and the developer carrying member. 1. A developing apparatus , comprising:a developer carrying member configured to carry and convey developer;a developer feeding member configured to feed the developer to the developer carrying member in abutment with the developer carrying member; anda developer regulating member having a distal end portion directed toward an upstream side in a rotation direction of the developer carrying member, and configured to regulate a layer thickness of the developer carried on the developer carrying member in abutment with a surface of the developer carrying member,wherein the developer carrying member and the developer feeding member rotate so that a surface of the developer carrying member and a surface of the developer feeding member move in a same direction in an abutment portion between the developer carrying member and the developer feeding member,wherein the distal end portion of the developer regulating member has a developer taking-in portion formed into a shape away from the surface of the developer carrying member ...

DEVELOPING DEVICE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS

A developing device includes a developing chamber, a developer containing chamber located on the lower side of the developing chamber, a partition wall configured to separate the developing chamber and the developer containing chamber, an opening configured to allow the developing chamber and the developer containing chamber to communicate with each other, disposed on the partition wall, a developer conveyance member configured to convey developer from the developer containing chamber to the developing chamber by causing the developer to pass through the opening, disposed on the developer containing chamber. In the developing device, a convex portion which protrudes to the developing chamber side is disposed on the partition wall. 1. A developing device used for an image forming apparatus comprising:a developing roller configured to bear developer;a developer supply roller configured to supply the developer to the developing roller;a developer regulating member configured to regulate an amount of the developer borne by the developing roller;a developing chamber in which the developing roller and the developer supply roller are arranged;a developer containing chamber configured to contain the developer, located on a lower side of the developing chamber in a mounted state where the developing device is mounted on a main body of the image forming apparatus;a partition wall configured to separate the developing chamber and the developer containing chamber;an opening configured to allow the developing chamber and the developer containing chamber to communicate with each other, disposed on the partition wall;a developer conveyance member configured to convey the developer from the developer containing chamber to the developing chamber by causing the developer to pass through the opening, disposed in the developer containing chamber; anda convex portion configured to protrude to the developing chamber side, disposed on the partition wall.2. The developing device according ...

DEVELOPMENT DEVICE AND IMAGE FORMING APPARATUS INCORPORATING SAME

A development device includes a developer bearer, a developer regulator to adjust an amount of developer on the developer bearer, a supply compartment adjacent to the developer bearer across a side wall formed monolithic with the development casing using an identical material, a developer supply member to transport developer in the supply compartment in an axial direction, and a channel forming member having higher rigidity than that of the side wall. The channel forming member defines, with the side wall, a supply route extending over an entire development range, through which developer moves from the supply compartment to the developer bearer, and defines, with an inner wall of the development casing, a collecting route through which developer blocked by the developer regulator is collected in the supply compartment. Both axial end portions of the channel forming member are supported by the development casing. 1. A development device comprising:a developer bearer to carry by rotation developer to a development range, the developer bearer exposed partly from a development casing;a developer regulator disposed facing the developer bearer to adjust an amount of developer carried on the developer bearer;a supply compartment formed inside the development casing, adjacent to the developer bearer, the supply compartment including a side wall on a side of the developer bearer, the side wall monolithic with the development casing and constructed of a material identical with a material of the development casing;a developer supply member to transport developer contained in the supply compartment in an axial direction of the developer bearer; anda channel forming member extending in the axial direction, constructed of a material having a degree of rigidity higher than that of the side wall,the channel forming member defining, with the side wall, a supply route through which developer moves from the supply compartment beyond the side wall to the developer bearer, the supply ...

DEVELOPING DEVICE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS

A developer regulating member is rotatably supported. A distance from the rotation center of the developer regulating member to the center of a developer carrying member is more than a distance from the center of a shaft portion to the leading edge of an elastic member and the bending angle β of the elastic member which is calculated from β=PL/2EI is less than the set angle α of the elastic member with respect to the developer carrying member. 1. A developing device used in an image forming apparatus , comprising:a developer carrying member that carries a developer to develop an electrostatic latent image formed on an image carrying member;a developer regulating member that includes a plate-shaped elastic member, is rotatably supported, and brings the elastic member into contact with the developer carrying member such that a leading edge of the elastic member faces an upstream side, in a rotation direction, of the developer carrying member to regulate the amount of developer held in the developer carrying member; andan urging portion that applies a moment to the developer regulating member to bring the developer regulating member into pressure contact with the developer carrying member,wherein a distance from a rotation center of the developer regulating member to a center of the developer carrying member is set to be more than a distance from the rotation center of the developer regulating member to the leading edge of the elastic member, and{'sup': '4', "when a load received by the developer regulating member due to contact between the developer carrying member is P (N), a free length of the developer regulating member is L (m), a Young's modulus of the developer regulating member is E (Pa), a second moment of area of the developer regulating member is I (m), and an angle formed between the elastic member and a tangent line to the developer carrying member in a contact portion between the leading edge of the developer regulating member and the developer regulating ...

DEVELOPING DEVICE AND IMAGE FORMING APPARATUS PROVIDED THEREWITH

A developing device of the present disclosure includes a developing roller, a toner feeding roller, a regulating blade, a blade holding member, a toner receiving member, and a casing. The regulating blade regulates a thickness of toner carried on the toner feeding roller. An air flow path is formed inside the blade holding member. The toner receiving member, the regulating blade, and the blade holding member each include a slit hole that leads to the air flow path. 1. A developing device , comprising:a developing roller arranged opposite to an image carrying member on which an electrostatic latent image is formed, the developing roller being configured to feed toner to the image carrying member in an opposing region where the developing roller and the image carrying member face each other;a toner feeding roller arranged opposite to the developing roller, the toner feeding roller being configured to feed toner to the developing roller in an opposing region where the toner feeding roller and the developing roller face each other;a regulating blade arranged opposite to the toner feeding roller at a predetermined distance from the toner feeding roller, below the opposing region where the developing roller and toner feeding roller face each other;a casing that holds therein the developing roller, the toner feeding roller, and the regulating blade;a blade holding member arranged under the regulating blade to extend along a longitudinal direction of the regulating blade, the blade holding member being configured to hold the regulating blade; anda toner receiving member arranged over the regulating blade to extend along the longitudinal direction of the regulating blade, the toner receiving member being configured to receive toner that falls from the developing roller,whereinan air flow path for discharging air from inside the casing is formed inside the blade holding member, andthe toner receiving member, the regulating blade, and the blade holding member each include a ...

DEVELOPING DEVICE AND IMAGE FORMING APPARATUS PROVIDED THEREWITH

A developing device of the present disclosure includes a developing roller, a toner feeding roller, a thickness regulating member, and a casing. The toner feeding roller feeds toner to the developing roller. The thickness regulating member is disposed opposite to the toner feeding roller at a predetermined distance from the toner feeding roller, and the thickness regulating member regulates a thickness of the toner carried on the toner feeding roller. The casing holds therein the developing roller, the toner feeding roller, and the thickness regulating member. The thickness regulating member is formed in a roller shape and rotatable. 1. A developing device comprising:a developing roller disposed opposite to an image carrying member on which an electrostatic latent image is formed, the developing roller being configured to feed toner to the image carrying member in an opposing region where the developing roller and the image carrying member face each other;a toner feeding roller disposed opposite to the developing roller, the toner feeding roller being configured to feed toner to the developing roller in an opposing region where the toner feeding roller and the developing roller face each other;a thickness regulating member disposed opposite to the toner feeding roller at a predetermined distance from the toner feeding roller, the thickness regulating member being configured to regulate a thickness of toner carried on the toner feeding roller; anda casing that holds therein the developing roller, the toner feeding roller, and the thickness regulating member,whereinthe thickness regulating member is disposed below the opposing region where the developing roller and the toner feeding roller face each other,the thickness regulating member is formed in a roller shape, andthe thickness regulating member is rotatable in a same direction as a direction in which the toner feeding roller rotates during a developing operation.2. The developing device according to claim 1 , ...

DEVELOPING DEVICE, PROCESS CARTRIDGE AND IMAGE FORMING APPARATUS

A developing apparatus includes a developing container for accommodating the developer; a sleeve for carrying the developer to developing zone for developing a latent image; a developer regulator contacted to the sleeve to regulate a developer layer thickness on the sleeve; a developer feeding member contacted to the sleeve supply the developer to the sleeve; an urging member for urging the sleeve toward the developer regulator; and a moving mechanism for moving the sleeve in a first direction which is a direction in which the urging member urges the sleeve and in a second direction crossing with the first direction. The moving mechanism moves the sleeve in the second direction to reduce or remove press-contact forces applied by the developer regulator and the developer feeding member. 1. A developing apparatus for developing a latent image formed on an image bearing member , comprising:a developing container for accommodating the developer;a rotatable developer carrying member for carrying the developer to developing zone for developing the latent image;a developer regulating portion contacted to said developer carrying member to regulate a thickness a layer of the developer carried on said developer carrying member to a predetermined thickness;a developer feeding member contacted to said developer carrying member to supply the developer to said developer carrying member;an urging member for urging said developer carrying member toward said developer regulating portion; anda moving mechanism for moving said developer carrying member in a first direction which is a direction in which said urging member urges said developer carrying member and in a second direction crossing with the first direction,wherein said moving mechanism moves said developer carrying member in the second direction to reduce or remove press-contact forces applied by said developer regulating portion and said developer feeding member.2. An apparatus according to claim 1 , further comprising a ...

PROCESS CARTRIDGE AND IMAGE FORMING APPARATUS

A process cartridge, wherein both in the case where the developing unit is at the contact position and in the case where the developing unit is at the separation position, a first regulating portion that the image bearing member unit has and a first regulated portion that the developing unit has, are engaged with each other, whereby the position in the axial direction of the image bearing member is regulated, wherein in the case where the developing unit is at the separation position, a second regulating portion and a second regulated portion, overlap each other in a direction perpendicular to the axial direction, and wherein in the case where the developing unit is at the contact position, the second regulating portion and the second regulated portion do not overlap each other in the direction perpendicular to the axial direction. 1. A process cartridge detachably attachable to an apparatus main body of an image forming apparatus , comprising:an image bearing member unit having an image bearing member; anda developing unit having a developing roller and connected to the image bearing member unit such that the developing unit is movable between a contact position where the developing roller is held in contact with the image bearing member and a separation position where the developing roller is separated from the image bearing member,wherein both in the case where the developing unit is at the contact position and in the case where the developing unit is at the separation position, a first regulating portion that the image bearing member unit has and a first regulated portion that the developing unit has, are engaged with each other, whereby the position in the axial direction of the image bearing member relative to the image bearing member unit of the developing unit is regulated,wherein in the case where the developing unit is at the separation position, a second regulating portion that the image bearing member unit has and a second regulated portion that the ...

Developing Device

A developing device includes: a developing frame having an opening; a developing roller that is arranged to the opening and is configured to carry developer; a supply roller configured to supply the developer to the developing roller, and a layer thickness regulation member configured to regulate a layer thickness of the developer carried on the developing roller. The developing frame includes: a developer accommodation chamber configured to accommodate the developer; a developer supply chamber configured to supply the developer, which is supplied from the developer accommodation chamber, to the supply roller; a developer return chamber that is arranged above the developer supply chamber and is configured to return the developer, which is scraped off by the layer thickness regulation member, to the developer accommodation chamber. The developer return chamber is provided with a developer returning unit configured to convey the developer to the developer accommodation chamber. 1. A developing device comprising:a developing frame having an opening that extends in a longitudinal direction thereof;a developing roller that is arranged to the opening and is configured to carry developer;a supply roller that is configured to supply the developer to the developing roller, anda layer thickness regulation member that is configured to regulate a layer thickness of the developer carried on the developing roller,wherein the developing frame includes:a developer accommodation chamber configured to accommodate the developer;a developer supply chamber configured to supply the developer, which is supplied from the developer accommodation chamber, to the supply roller;a developer return chamber that is arranged above the developer supply chamber and is configured to return the developer, which is scraped off from the developing roller by the layer thickness regulation member, to the developer accommodation chamber; anda partition wall that is disposed adjacent to the supply roller ...

Developing cartridges with fixed protrusions and manufacturing method thereof

Developing cartridges include a main body, a developer transport member, and a developer thickness regulating member. The main body includes a first and second side portions separated from each other along a direction. The developer thickness regulating member regulates a developer thickness and extends in a direction between the first and second side portions. The developer thickness regulating member includes an end portion, which is disposed near the first side portion, and a first protrusion, which extends along the particular direction from the end portion to at least the first side portion. The main body forms a cavity in the first side portion. The cavity is defined by at least a first surface, a second surface opposing the first surface, and a second protrusion that protrudes from the first surface toward the second surface. The first protrusion is fixed at a position between the second protrusion and the second surface.

DEVELOPING DEVICE

A developing device includes a developer roller, a stir-and-transport member, and a layer thickness regulating member. The developer roller may carry developer to a photosensitive body. The stir-and-transport member may supply the developer to the developer roller. The layer thickness regulating member is located adjacent the developer roller to remove excess developer. The layer thickness regulating member includes a guide element to direct the excess developer to the stir-and-transport member. 1. A developing device comprising:a developer roller having an outer circumferential surface to carry developer;a rotatable stir-and-transport member to supply developer to the developer roller; anda layer thickness regulating member to remove excess developer so that the developer carried on the outer circumferential surface of the developer roller is made to have a uniform thickness, wherein the layer thickness regulating member includes a guide element to direct the excess developer back to the stir-and-transport member.2. The developing device according to claim 1 , wherein the layer thickness regulating member includes at least a first blade and a second blade disposed adjacent the first blade claim 1 ,wherein the first blade and the second blade are spaced apart adjacent to the outer circumferential surface of the developer roller,wherein the first blade is positioned on a downstream side of the second blade along a developer transport direction of the developer roller, andwherein the guide element comprises an opening formed in the second blade.3. The developing device according to claim 2 , wherein the first blade has a developer-regulating surface and a distal edge claim 2 , wherein the second blade has a developer-regulating surface and a distal edge claim 2 , and wherein respective virtual lines extending radially from a central axis of the developer roller to intersect with the respective distal edges of the first blade and the second blade claim 2 , form ...

DEVELOPING DEVICE, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS

A developing device includes a developing chamber provided with a developing roller that conveys toner to a developing area, and a toner regulating member that is in contact with a surface of the developing roller; and a toner container that contains the toner. An opening that allows the developing chamber and the toner container to communicate with each other is closed by a seal member that prevents the toner in the toner container from flowing into the developing chamber, and the seal member is removable from the opening. Spherical resin particles are provided at least in a contact portion between the developing roller and the toner regulating member. A Martens hardness of the spherical resin particles is 0.5 N/mmor higher and 45 N/mmor lower, and a restoring elastic power of the spherical resin particles is 70% or higher. 1. A developing device comprising: a developing roller that conveys toner to a developing area, and', 'a toner regulating member that is in contact with a surface of the developing roller; and, 'a developing chamber provided with'}a toner container that contains the toner,wherein an opening that allows the developing chamber and the toner container to communicate with each other is closed by a seal member that prevents the toner in the toner container from flowing into the developing chamber, and the seal member is removable from the opening,wherein spherical resin particles are provided at least in a contact portion between the developing roller and the toner regulating member, and{'sup': 2', '2, 'wherein a Martens hardness of the spherical resin particles is 0.5 N/mmor higher and 45 N/mmor lower, and a restoring elastic power of the spherical resin particles is 70% or higher.'}2. The developing device according to claim 1 , wherein a base material of the spherical resin particles is urethane resin.3. The developing device according to claim 1 , wherein an average circularity of the spherical resin particles is 0.96 or higher.4. The developing ...

Developing Device

A developing device and image forming apparatus are provided. The developing device includes a chassis; a developer carrying member; a thickness regulating member; a supply member; and a conveying member. In a state in which the developing device is attached to a main body an opening of the chassis faces upward; the thickness regulating member pressure-contacts the developer carrying member from below the developer carrying member; the conveying member is disposed below the developer carrying member; the supply member overlaps a portion of the conveying member in a horizontal direction; and a portion of the conveying member is disposed within a vertical projection plane between a pressure-contact position of the thickness regulating member to the developer carrying member, and a contact position of the supply member to the developer carrying member. The image forming apparatus includes a main body; a plurality of photosensitive members; and a plurality of developing devices.

DEVELOPING DEVICE AND IMAGE FORMING APPARATUS

A developing device includes a housing that includes an accommodating chamber, a development opening, and a discharge opening, part of developer that is accommodated in the accommodating chamber overflowing into and being discharged from the discharge opening; a developing roller that holds and transports the developer that is supplied from the accommodating chamber; a transporting member that transports the developer in the accommodating chamber so as to supply the developer to the developing roller while stirring the developer; a regulating member that regulates a thickness of a layer of the developer that is held by the developing roller by holding back part of the developer; and a ventilation path portion that is provided so as to extend through the regulating member, the ventilation path portion being connected to a gap space that exists in a range extending to the development opening from where the developing roller passes the regulating member. 1. A developing device comprising:a housing that includes an accommodating chamber, a development opening, and a discharge opening, the accommodating chamber accommodating developer, the development opening having its opening in a portion of the accommodating chamber that faces a latent image holding member, part of the developer that is accommodated in the accommodating chamber overflowing into and being discharged from the discharge opening;a developing roller that is provided at the housing such that the developing roller rotates with a portion of the developing roller being exposed from the development opening, the developing roller holding and transporting the developer that is supplied from the accommodating chamber;a transporting member that is provided in the accommodating chamber of the housing such that the transporting member rotates, the transporting member transporting the developer in the accommodating chamber so as to supply the developer to the developing roller while stirring the developer, the portion ...

Method of attaching regulating blade and development apparatus

A method of attaching a regulating blade made of resin to an attachment portion of a development frame which is made of resin and includes the attachment portion for attaching the regulating blade includes applying an adhesive to the attachment portion, applying a hardening accelerator to the regulating blade, and attaching the regulating blade to the attachment portion via the adhesive applied to the attachment portion and the hardening accelerator applied to the regulating blade. The regulating blade is disposed opposite to and not in contact with a development rotary member configured to bear and convey a developer toward a position at which an electrostatic image formed on an image bearing member is developed, and configured to regulate an amount of the developer to be borne on the development rotary member.

DEVELOPING DEVICE

A developing device includes: a developer carrying member; a magnet; a developing chamber; a blade member; and a guiding portion. A distance from a developer feeding start position of the guiding portion to said blade member is 2 mm or more along a developer carrying member rotational direction. When a magnetic force at a surface of the developer carrying member with respect to a direction normal to the developer carrying member is Fr, the magnetic poles are provided so that a ratio of an integrated value FrNear obtained by integrating the magnetic force Fr from the blade member to a position of 2 mm upstream of the blade member with respect to the rotational direction to an integrated value FrAll obtained by integrating the magnetic force from the blade member to the developer feeding start position with respect to the rotational direction is 60% or more. 1. A developing device comprising:a developer carrying member for carrying a developer comprising a toner and a carrier;a magnet, provided inside said developer carrying member, including a plurality of magnetic poles with respect to a rotational direction of said developer carrying member;a developing chamber for feeding the developer to said developer carrying member;a non-magnetic blade member for regulating an amount of the developer to be coated on said developer carrying member; anda guiding portion for guiding the developer from above to said developer carrying member with respect to a direction of gravitation, wherein said guiding portion is provided, opposed to said blade member and said developer carrying member, upstream of said blade member with respect to the rotational direction of said developer carrying member,wherein a distance from a developer feeding start position of said guiding portion where feeding of the developer toward said developer carrying member starts to said blade member is 2 mm or more with respect to the rotational direction of said developer carrying member, and when a magnetic ...

Electrophotographic member, process cartridge, and electrophotographic apparatus

Provided is an electrophotographic member including an electro-conductive substrate and a surface layer on the substrate. The surface layer contains a urethane resin and a first polymer having a specific nitrogen-containing structure. The urethane resin has a structure derived from a second polymer containing a fluorine atom or a structure derived from a third polymer containing a fluorine atom and a silicon atom. The surface layer contains nitrogen atoms derived from the nitrogen-containing structure at a specific ratio in a region from the outer surface of the surface layer to a depth of 300 nm, and the atomic ratios of nitrogen atoms, fluorine atoms, and silicon atoms in a region from a depth of 100 nm from the outer surface of the surface layer to a depth of 300 nm and a region from the outer surface to a depth of 10 nm have specific relationships.

Developing Device That Removes Toner Accumulated on Top Surface of Regulating Blade with Simple Configuration, and Image Forming Apparatus Including the Same

A developing device includes a developing roller, a toner supply roller, a regulating blade, a casing, and a cleaning member. The developing roller supplies a toner to the image carrier in a region opposed to an image carrier. The toner supply roller is located opposed to the developing roller. The toner supply roller forms a magnetic brush made of a two-component developer including a magnetic carrier and a toner on an outer peripheral surface to supply a toner to the developing roller in a region opposed to the developing roller. The regulating blade is located opposed to the toner supply roller at a predetermined interval. The casing houses the developing roller, the toner supply roller, and the regulating blade. The cleaning member reciprocates along a longitudinal direction of the regulating blade so as to remove a toner accumulated on a top surface of the regulating blade.

DEVELOPING DEVICE, IMAGE FORMING APPARATUS AND METHOD OF MANUFACTURING DEVELOPING DEVICE

A developing device includes an agitating member, a magnetic roller, a lower housing, an upper housing and a blade member. The lower housing includes a first housing part including a first edge having a first contact face and a first facing surface at a blade member's side. The upper housing includes a second housing part including a second edge having a second contact face contact with the first contact face and a second facing surface facing to the first facing surface. The blade member is attached to the upper housing and arranged at a gap to the lower housing. Between the first and second facing surfaces, a width at a blade member's side is broader than a width at a first contact face's side. The first and second facing surfaces are bonded by an adhesive agent. The gap is sealed by the adhesive agent. 1. A developing device comprising:an agitating member rotating around an axis to agitate a developer;a magnetic roller arranged above the agitating member and carrying the developer;a lower housing including a first housing part opened at an upper side to house the agitating member in the first housing part;an upper housing including a second housing part opened at a lower side to house the agitating member and the magnetic roller in the second housing part, and including an opening from which a part of an outer circumferential face of the magnetic roller is exposed; anda blade member arranged below the opening, having an upper part fixedly attached to an outer face of the upper housing, having a lower part facing to an outer face of the lower housing to make a gap between the blade member and the lower housing, and restricting a layer thickness of the developer carried on the magnetic roller,wherein the first housing part has a first edge including a first contact face,the second housing part has a second edge including a second contact face coming into contact with the first contact face,a part of the first edge positioned between the first housing part and the ...

Channel state information measurements for license assisted access

Systems and methods relating to accurate Channel State Information (CSI) measurements for a License Assisted Secondary Cell (LA SCell) are disclosed herein. A wireless device operates in a cellular communications network according to a carrier aggregation scheme using both a licensed frequency band and an unlicensed frequency band operates to determine whether a CSI Reference Symbol (CSI-RS) transmission from an LA SCell is present in a subframe, where the LA SCell is in an unlicensed frequency band. Upon determining that a CSI-RS transmission is present in the subframe, the wireless device performs a first type of interference measurement on configured CSI Interference Measurement (CSI-IM) resources in the subframe. Upon determining that a CSI-RS transmission is not present in the subframe, the wireless device performs a second type of interference measurement on the configured CSI-IM resources in the subframe. Related methods and storage media are also described.

TONER, IMAGE FORMING APPARATUS, AND IMAGE FORMATION METHOD

A toner includes toner particles. The toner particles each include a toner mother particle containing a binder resin and an external additive attached to a surface of the toner mother particle. The external additive includes fluororesin particles. The fluororesin particles have a number average primary particle diameter of at least 100 nm and no greater than 300 nm. An area ratio of a region of the surface of the toner mother particle that is covered with the fluororesin particles is at least 0.70% and no greater than 2.20% in the surface of the toner mother particle. 1. A toner comprising toner particles , whereinthe toner particles each include a toner mother particle containing a binder resin and an external additive attached to a surface of the toner mother particle,the external additive includes fluororesin particles,the fluororesin particles have a number average primary particle diameter of at least 100 nm and no greater than 300 nm, andan area ratio of a region of the surface of the toner mother particle that is covered with the fluororesin particles is at least 0.70% and no greater than 2.20% in the surface of the toner mother particle.2. The toner according to claim 1 , whereinthe area ratio of the region of the surface of the toner mother particle that is covered with the fluororesin particles is at least 0.72% and no greater than 1.09% in the surface of the toner mother particle.3. The toner according to claim 1 , whereinthe fluororesin particles contain polytetrafluoroethylene.4. The toner according to claim 1 , whereinan amount of the fluororesin particles is at least 0.30 parts by mass and no greater than 0.60 parts by mass relative to 100 parts by mass of the toner mother particles.5. The toner according to claim 1 , whereinthe external additive further includes inorganic particles.6. An image forming apparatus comprising:an image bearing member; anda development device configured to develop an electrostatic latent image formed on a surface of the ...

DEVELOPING DEVICE WITH ELASTIC FILM TO BLOCK AIR INPUT

An example developing device includes a housing to contain a developer and having an opening, a developing sleeve provided in the housing and partially exposed to the outside of the housing through the opening, a magnetic member including a plurality of magnetic poles and located inside the developing sleeve, and an elastic member blocking an inflow of air through a space between a downstream edge of the opening in a rotation direction of the developing sleeve and an outer circumferential surface of the developing sleeve. The elastic member includes a fixed portion fixed to the housing at a position adjacent to the downstream edge of the opening and an extension portion extending from the fixed portion in a bent form in the rotation direction of the developing sleeve to be elastically in contact with the surface of the developing sleeve. 1. A developing device comprising:a housing to contain a developer and having an opening;a developing sleeve provided in the housing and partially exposed to the outside of the housing through the opening;a magnetic member comprising a plurality of magnetic poles and located inside the developing sleeve; andan elastic member blocking an inflow of air through a space between a downstream edge of the opening in a rotation direction of the developing sleeve and an outer circumferential surface of the developing sleeve, a fixed portion fixed to the housing at a position adjacent to the downstream edge of the opening; and', 'an extension portion extending from the fixed portion in a bent form in the rotation direction of the developing sleeve to be elastically in contact with the surface of the developing sleeve., 'wherein the elastic member comprises2. The developing device of claim 1 , wherein an angle between a line tangential to the developing sleeve at a contact portion between the extension portion and the developing sleeve and a line extending from the fixed portion toward the developing sleeve is 90 degrees or more.3. The ...

IMAGE FORMING APPARATUS

A developing device includes a housing, a developing roller, and a blade. The housing includes a developer chamber and an opening. The developing roller is disposed in the developer chamber, such that a part of the developing roller in a rotational direction thereof is exposed to an outside of the opening. The developer roller includes a sleeve rotatable around a shaft and a magnetic element. The magnetic element has a magnetic polarity opposite to that of a developer and is disposed at an entrance rotational position of the developer roller at which a sleeve region of the sleeve goes into the developer chamber from the outside of the opening. The blade is positioned near a surface of the sleeve to regulate a thickness of the developer on the surface of the sleeve. The thickness of the developer regulated on the sleeve region at the entrance rotational position by the blade is equal to or greater than 0.6 mm and equal to or less than 1.4 mm. 1. A developing device comprising:a housing including a developer chamber and an opening;a developing roller disposed in the developer chamber, such that a part of the developing roller in a rotational direction thereof is exposed to an outside of the opening,wherein the developer roller includes a shaft, a sleeve rotatable around the shaft, and a magnetic element between the shaft and the sleeve, the magnetic element having a magnetic polarity opposite to a magnetic polarity of a developer and being disposed at an entrance rotational position of the developer roller at which a sleeve region of the sleeve goes into the developer chamber from the outside of the opening; anda blade positioned near a surface of the sleeve to regulate a thickness of the developer on the surface of the sleeve, wherein the thickness of the developer regulated on the sleeve region at the entrance rotational position by the blade is equal to or greater than 0.6 mm and equal to or less than 1.4 mm.2. The developing device according to claim 1 , wherein ...

DEVELOPING DEVICE, CLEANING DEVICE AND LIQUID DEVELOPER DEVICE

A developing device includes a developer carrying member () rotating while carrying a liquid developer on a carrying surface () and an end portion restricting member () for restricting movement of the liquid developer, carried on the carrying surface (), to an outside of the carrying surface (). A contact angle between the end portion restricting member () and the liquid developer is set so as to be larger than a contact angle between the carrying surface () of the developer carrying member () and the liquid developer. By this, when the developer carrying member () is separated from the end portion restricting member (), deposition of the liquid developer in a large amount in the neighborhood of an end () of the carrying surface () is prevented. 1. A developing device comprising:a rotatable developer carrying member for carrying a liquid developer for developing an electrostatic latent image borne on an image bearing member; andan end portion restricting member, provided in contact with said developer carrying member at an end portion of said developer carrying member with respect to a rotational axis direction of said developer carrying member, for restricting movement of the liquid developer in the rotational axis direction,wherein a contact angle of a side surface of said end portion restricting member on a side where said developer carrying member carries the liquid developer, to the liquid developer is 45° or more.2. A developing device comprising:a rotatable developer carrying member for carrying a liquid developer for developing an electrostatic latent image borne on an image bearing member; andan end portion restricting member, provided in contact with said developer carrying member at an end portion of said developer carrying member with respect to a rotational axis direction of said developer carrying member, for restricting movement of the liquid developer in the rotational axis direction,wherein a side surface of said end portion restricting member on a ...

Developing device and image forming apparatus therewith

A developing device includes a developer container, a developer carrier, first and second stirring/transporting members, a driving motor, first and second magnetic permeability sensors, and a control portion. The first magnetic permeability sensor is arranged in a first conveying chamber in the developer container, in a region other than a part facing a communication portion and senses the toner concentration in developer in the developer container. The second magnetic permeability sensor is arranged in a second conveying chamber in the developer container, in a region between a regulating portion and a downstream end of the developer carrier in the second direction. The control portion controls the supply amount of developer based on the output value of the first magnetic permeability sensor, and calculates the stable volume of developer in the developer container based on the difference between the output values of the first and second magnetic permeability sensors.

DEVELOPING DEVICE AND IMAGE FORMING APPARATUS INCLUDING THE SAME

A developing device of the present disclosure includes a developing roller, a toner supply roller, a regulation blade, a casing, a toner receiving support member, a toner receiving member, a vibration generation unit, and a vibration inhibition member. The toner receiving support member is disposed in the casing so as to be opposed to the developing roller or the toner supply roller in an area between the regulation blade and an image carrier. The toner receiving member has a toner receiving surface that receives toner dropping from the developing roller, and is supported so as to be swingable about an end edge thereof on a toner supply roller side as a fulcrum. In a state where the toner receiving member is not vibrating, the vibration inhibition member is in contact with each of both end portions of the toner receiving surface in a longitudinal direction thereof. 1. A developing device , comprising:a developing roller that is disposed so as to be opposed to an image carrier on which an electrostatic latent image is formed and supplies toner to the image carrier in an opposing region where the developing roller is opposed to the image carrier;a toner supply roller that is disposed so as to be opposed to the developing roller and supplies toner to the developing roller in an opposing region where the toner supply roller is opposed to the developing roller;a regulation blade that is disposed so as to be opposed to the toner supply roller at a prescribed spacing therefrom;a casing that houses the developing roller, the toner supply roller, and the regulation blade;a toner receiving support member that is disposed in the casing so as to be opposed to the developing roller or the toner supply roller in an area between the regulation blade and the image carrier;a toner receiving member that is disposed along a longitudinal direction of the toner receiving support member, has a toner receiving surface that receives toner dropping from the developing roller, and is ...

DEVELOPMENT CARTRIDGE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS

An image forming apparatus includes: a cartridge; a developer container, in which the cartridge allows the developer container to be movable between first and second positions; an apparatus main body including an opening through which the cartridge passes when the cartridge is attached and an opening and closing member movable between an open position to open the opening and a close position to close the opening; and a moving member moving to be at different positions between a case where the developer container is attached at the first position and a case where it is attached at the second position, and when the developer container is attached at the first position, the moving member is at a position of preventing movement from the open position to the close position, and when it is attached at the second position, the moving member is at a position of allowing the movement. 1. An image forming apparatus comprising:a cartridge that includes a developer carrier configured to carry developer on a surface thereof and a blade configured to regulate thickness of the developer carried on the surface of the developer carrier;a developer container detachably attachable to the cartridge and containing the developer,wherein the developer container is movable, with respect to the cartridge, between a first position and a second position different from the first position in a state where the developer container is attached to the cartridge;an apparatus main body that has an attachment portion to which the cartridge is attached, the apparatus main body including an opening through which the cartridge passes when the cartridge is attached to the attachment portion and an opening and closing member that is configured to be movable between an open position where the opening is opened and a close position where the opening is closed; anda moving member that moves so that in a case where the cartridge in which the developer container is attached at the first position is attached to ...

DEVELOPING BLADE, DEVELOPING DEVICE, AND CARTRIDGE

A developing device includes a developer bearing member, a developer container, a regulating blade including a plate-like elastic portion, and an elastic seal sealing, and a pressing member pressing the elastic seal, wherein the plate-like elastic portion includes a metal plate, a second projection projecting from a second surface of the metal plate facing the developer bearing member, and a first projection projecting from a first surface opposite to the second surface of the metal plate, and wherein a projecting amount of the first projection is greater than a projecting amount of the second projection, wherein a top surface of the second projection contacts the surface of the developer bearing member, and an end surface of the first projection contacts an end surface of the elastic seal in the rotation axis direction. 1. A developing device comprising:a developer bearing member configured to bear developer on a surface thereof;a developer container configured to contain the developer and rotatably support the developer bearing member, wherein the developer is supplied from the developer container to the developer bearing member;a regulating blade including a plate-like elastic portion, configured to regulate a thickness of a layer of the developer born on a surface of the developer bearing member, wherein a one end portion of the plate-like elastic portion is in contact with the developer bearing member, and the other end portion of the plate-like elastic portion is supported by the developer container in a direction orthogonal to a rotation axis direction of the developer bearing member;an elastic seal provided to be compressed between the developer bearing member and the developer container in an area of the developer container outside of the regulating blade in the rotation axis direction, configured to seal a gap between the developer bearing member and the developer container; anda pressing member configured to press the elastic seal so that an end surface ...

DEVELOPER REGULATING MEMBER, DEVELOPING DEVICE, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS

To provide a developer regulating member which can generate a uniform frictional charge even on a developer having a small size. A developer regulating member for regulating the thickness of the layer of a developer carried on the surface of a developer carrier, having: a regulating portion contacting with the developer, wherein the regulating portion includes a thermoplastic acrylic resin, and the thermoplastic acrylic resin has a first endothermic peak having a peak top at +50° C. or more and a second endothermic peak having a peak top at +20° C. or less on the differentiation curve of a DSC curve obtained when the temperature is raised from −100° C. to 150° C. at a rate of temperature rise of 20.0° C./min using differential scanning calorimetry (DSC). 1. A developer regulating member for regulating a thickness of a layer of a developer carried on a surface of a developer carrier , the developer regulating member comprising a regulating portion in contact with the developer ,wherein the regulating portion comprises a thermoplastic acrylic resin, andwherein the thermoplastic acrylic resin has a first endothermic peak having a peak top at +50° C. or more and a second endothermic peak having a peak top at +20° C. or less on a differentiation curve of a DSC curve obtained when temperature is raised from −100° C. to 150° C. at a rate of temperature rise of 20.0° C./min using differential scanning calorimetry (DSC).2. The developer regulating member according to claim 1 ,wherein the thermoplastic acrylic resin comprises a first polymer exhibiting the first endothermic peak and a second polymer exhibiting the second endothermic peak.3. The developer regulating member according to claim 2 , wherein the first polymer has a weight average molecular weight of 1×10to 5×10.4. The developer regulating member according to claim 2 , wherein the second polymer has a weight average molecular weight of 1×10to 1×10.5. The developer regulating member according to claim 2 , wherein a ...

CHARGE BLADE HAVING MULTIPLE CONTACT POINT METERING

A charge blade meters and applies an electrical charge to toner while the toner is on a development roll. The end portion of the charge blade comprises a first curved surface and a second curved surface touching the development roll. The first curved surface has a smaller radius and is a longer distance from the middle portion of the charge blade relative to the second curved surface. The first curved surface produces a first amount of charge in the toner on the development roll, and the second curved surface increases and makes more uniform the charge within the toner on the development roll. Also, the smaller radius of the first curved surface controls the amount of toner positioned on the development roll and the larger radius of the second curved surface does not affect the amount of toner metered by the first, smaller radius curved surface. 1. A charge blade comprising:a middle portion; andan end portion distal to said middle portion,said end portion touching a marking material feeder,said charge blade metering and applying an electrical charge to marking material on said marking material feeder, a first curved surface touching said marking material feeder;', 'a second curved surface touching said marking material feeder; and', 'a third curved surface touching said marking material feeder,, 'said end portion comprisingsaid second curved surface being positioned, on said charge blade, between said first curved surface and said middle portion of said charge blade,said third curved surface being positioned, on said charge blade, between said second curved surface and said middle portion of said charge blade,said first curved surface having a smaller radius relative to a larger radius of said second curved surface, andsaid second curved surface having a smaller radius relative to a larger radius of said third curved surface.2. The charge blade according to claim 1 , said marking material feeder having a surface rotating in a first direction from said end portion of ...

DEVELOPING DEVICE AND IMAGE FORMING APPARATUS

A developing device includes: a latent image carrier on which an electrostatic latent image is formed; a developer carrier that supplies the latent image carrier with developer to develop the latent image formed on the latent image carrier; and a regulating member that forms a thin layer of the developer on the developer carrier. The developer includes a release agent. An endothermic amount of the release agent in the developer is from 1.87 mJ/mg to 2.51 mJ/mg inclusive. A proportion of particles having particle sizes not greater than 3.021 μm in the developer is from 0% to 21.76% by number inclusive. 1. A developing device comprising:a latent image carrier on which an electrostatic latent image is formed;a developer carrier that supplies the latent image carrier with developer to develop the latent image formed on the latent image carrier; anda regulating member that forms a thin layer of the developer on the developer carrier, wherein:the developer includes a release agent,an endothermic amount of the release agent in the developer is from 1.87 mJ/mg to 2.51 mJ/mg inclusive, anda proportion of particles having particle sizes not greater than 3.021 μm in the developer is from 0% to 21.76% by number inclusive.2. A developing device comprising:a latent image carrier on which an electrostatic latent image is formed;a developer carrier that supplies the latent image carrier with developer to develop the latent image formed on the latent image carrier; anda regulating member that forms a thin layer of the developer on the developer carrier, wherein:the developer is includes a release agent,an endothermic amount of the release agent in the developer is from 1.87 mJ/mg to 2.51 mJ/mg inclusive, anda proportion of particles having particle sizes not greater than 1.977 μm in the developer is from 0% to 19.62% by number inclusive.3. The developing device of claim 1 , wherein a proportion of particles having particle sizes not greater than 1.977 μm in the developer is from 0% ...

DEVELOPING APPARATUS, ELECTROPHOTOGRAPHIC PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS

The developing apparatus includes: a developing roller rotatable in a first rotation direction; and a developer regulating member, wherein the developing roller includes: a substrate; an electro-conductive elastic layer on the substrate; and insulating domains on the electro-conductive elastic layer, wherein the electro-conductive elastic layer has a certain Martens hardness, the developing roller has a surface including surfaces of the insulating domains and a surface of the electro-conductive elastic layer, which is uncovered with the insulating domains at a certain area ratio, wherein the developer regulating member comprises: an abutting portion which is in contact with the surface of the developing roller, and a certain projection portion extending to an upstream side from the abutting portion in the first rotation direction, the developing apparatus has a certain gap between a side of the projection portion facing to the developing roller, and the surface of the developing roller. 2. A developing apparatus according to claim 1 , wherein an average of respective heights of the insulating domains is 0.5 μm or more and 15.0 μm or less.3. A developing apparatus according to claim 1 , wherein the electro-conductive elastic layer has a laminated structure including two or more layers.4. A developing apparatus according to claim 1 , wherein the electro-conductive elastic layer contains a polyurethane resin.5. A developing apparatus according to claim 1 ,wherein the projection portion has a region at which a profile line of a surface of the projection portion in a side facing to the developing roller, has a concave shape to the developing roller, andwherein the region has an area at which the gap distance is 0.05 mm or more and 0.5 mm or less, and the area has a surface length W2 of 0.5 mm or more.6. A developing apparatus according to claim 1 , whereina first tangential line at a first point, and a second tangential line at a second point, forms an angle of −5° or ...

Developing apparatus, process cartridge and electrophotographic image forming apparatus

The developing apparatus includes a developer carrying roller rotatable in a first rotating direction, and a developer regulating member which regulates a thickness of a developer layer carried on the developer carrying roller, wherein at least a part of the developer regulating member is in pressure contact with a surface of the developer carrying roller to form an abutting portion between the developer carrying roller and the developer regulating member, the abutting portion having an abutting width W in a circumferential direction of the developer carrying member of 1.0 to 5.0 mm, wherein in the abutting portion, an abutting pressure has a maximum value in a first area, the first area having a width of 20% or less of the abutting width W from an upstream edge of the abutting portion in the rotating direction, and wherein an abutting pressure in a second area is 0.08 to 0.18 MPa.

Developing apparatus, process cartridge and electrophotographic image forming apparatus

The developing apparatus includes a developer carrying roller rotatable in a first rotating direction, and a developer regulating member which controls the thickness of a developer layer, the developer regulating member having a developer layer thickness regulating part and a projecting part, and having an abutting part with the surface of the developer carrying roller at the developer layer thickness regulating part, and the projecting part having a concave shape at a side facing the developer carrying roller, the projecting part and the surface of the developer carrying roller forming a gap therebetween at an upstream side in the rotating direction from the abutting part, the gap having a portion where a gap width of 0.05-0.5 mm; a maximum value Hmax and a minimum value Hmin of the gap width satisfy the expression Hmax/Hmin≦3.0; and the portion having a continuous length of 0.8 mm or more.

DEVELOPMENT DEVICE AND IMAGE FORMING APPARATUS INCLUDING THE DEVELOPMENT DEVICE

A development device includes a development housing, a development roller, a supply roller and a layer thickness regulating member. The development housing stores a nonmagnetic one-component toner. The development roller is formed by a cylindrical elastic body, and moves in a same direction as a rotational direction of a rotatable photosensitive drum at a development nip area while coming into contact with the photosensitive drum. The supply roller is formed by a cylindrical elastic body, and supplies the toner to the development roller and collects the toner from the development roller. The development roller has a surface free energy within a range of 5 mJ/mor more and 27 mJ/mor less. 1. A development device comprising:a development housing in which a nonmagnetic one-component toner is stored;a development roller formed by a cylindrical elastic body, supported by the development housing in a rotatable manner so as to move in a same direction as a rotational direction of a rotatable photosensitive drum at a development nip area while coming into contact with the photosensitive drum, and having a circumferential face on which the toner is carried, the photosensitive drum having a surface on which an electrostatic latent image is carried;a supply roller formed by a cylindrical elastic body, supported by the development housing in a rotatable manner, coming into contact with the circumferential face of the development roller to form a supply nip area between the supply roller and the development roller, supplying the toner to the development roller and collecting the toner from the development roller; anda layer thickness regulating member coming into contact with the circumferential face of the development roller on a downstream side of the supply nip area in a rotational direction of the development roller and on an upstream side of the development nip area in the rotational direction of the development roller, and regulating a thickness of the toner on the ...

DEVELOPING UNIT AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS EMPLOYING THE SAME

A developing unit employing a two-component developing agent is shown. The developing unit includes a first regulating member, a second regulating member, and a third regulating member forming first, second, and third regulating gaps respectively with a developing roller. The third regulating member forms a recovery path for recovering excessive developing agent that may not pass through the first and second regulating gaps to an agitating region between the third and second regulating members. A distance between a vertical line passing through an upstream side end portion of the second regulating member based on a rotating direction of the developing roller and a center of the developing roller is greater than a radius of the developing roller, and a downstream end of the third regulating member is located between a regulating pole and a catch pole. 1. A developing unit for supplying a toner in a developing agent , in which the toner and a carrier are mixed , to an electrostatic latent image formed on an image carrier , the developing unit comprising:an agitating region in which the developing agent is agitated;a developing member which supplies the toner to the image carrier by attaching the developing agent on an outer circumference thereof, and which comprises a rotating sleeve, and a magnetic pole member including a regulating pole and a catch pole disposed on an upstream side of the regulating pole for attaching the developing agent to an outer circumference of the sleeve and disposed inside the sleeve;a first regulating member which faces the regulating pole to form a first regulating gap between the first regulating member and the outer circumference of the sleeve;a second regulating member which forms a second regulating gap at an upstream side of the first regulating gap based on a rotating direction of the developing member, between the second regulating member and the outer circumference of the sleeve; anda third regulating member which forms a third ...

IMAGE FORMING APPARATUS AND CONTROL METHOD FOR THE SAME

An image forming apparatus and a control method for the same, which ensure acquisition of a high-quality image by controlling physical-states of toner on a developer roller based on sensed variation in states of internal components of a developer cartridge, and which enable sensing and determination of the lifespan of the developer cartridge, is provided. The control method for the image forming apparatus includes applying a current detection bias to a developer roller blade of a developer cartridge, detecting the magnitude of current of the developer roller blade when the current detection bias is applied to the developer roller blade, and variably controlling a developer cartridge bias to be applied to the developer cartridge for image formation based on the detected magnitude of current of the developer roller blade, so as to allow a target magnitude of constant current to flow through the developer roller blade during image formation. 1. A control method for an image forming apparatus , the method comprising:applying a current detection bias to a developer roller blade of a developer cartridge;detecting the magnitude of current flowing through the developer roller blade when the current detection bias is applied to the developer roller blade; andvariably controlling a developer cartridge bias to be applied to the developer cartridge for image formation based on the detected magnitude of current of the developer roller blade, so as to allow a target magnitude of constant current to flow through the developer roller blade during image formation.2. The method according to claim 1 , wherein:the magnitude of current flowing through the developer roller blade is detected while the current detection bias is applied to the developer roller blade for a preset time; andthe current detection is performed at a plurality of trigger times to acquire a plurality of current values, and the average of the plurality of current values is utilized as a representative value of the ...

Fitting structure for a plate-form member

A fitting structure for fitting a plate-form member to a fitting destination member such that a position of the plate-form member relative to a target member is adjustable, the fitting structure has an adjustment pin inserted, in a fashion movable in a position adjustment direction, in an adjustment hole formed in the plate-form member; and a screw member for fastening the plate-form member to the fitting destination member, wherein a direction of a force of the screw member that acts upon the plate-form member when the screw member is in a position where the screw member fastens the plate-form member points from a side where a gap formed between the adjustment pin and the adjustment hole is smaller to a side where the gap is larger.

Process cartridge and image forming method

Provided is a process cartridge by which the stability of an image having a high print percentage can be obtained even when high-density loading is performed. The process cartridge is a process cartridge in which a toner having a uniaxial collapse stress at the time of a maximum consolidation stress of 10.0 kPa of 2.0 kPa or more and 4.5 kPa or less, and a total energy measured after its compression of 70 mJ or more and 95 mJ or less is stored in a toner container in a state in which the container has a loading density of 0.70 g/cm 3 or more.

DEVELOPING DEVICE AND IMAGE FORMING APPARATUS

A developing device includes a developer holding body, a container, a contact member, and a restriction member. The developer holding body supplies a developer to an image holding body. The container accommodates the developer holding body and is formed with an opening portion facing the image holding body. The deformable contact member is fixed in the container and on a downstream side of the opening portion body in a rotation direction of the developer holding body and includes a tip end which extends toward an inner side of the container and which contacts with the developer holding body. The restriction member is disposed on an image holding body side of the contact member and restricts the tip end of the contact member from deforming so as to be in a state where the contact member is directed toward an outer side of the container. 1. A developing device comprising:a cylindrical developer holding body that supplies a developer to an image holding body on which an electrostatic latent image is formed, while holding the developer and rotating;a container that accommodates the developer holding body and that is formed with an opening portion facing the image holding body;a deformable contact member that is fixed in the container and on a downstream side of the opening portion body in a rotation direction of the developer holding body and that includes a tip end which extends toward an inner side of the container and which contacts with the developer holding body; anda restriction member that is disposed on an image holding body side of the deformable contact member and that restricts the tip end of the deformable contact member from deforming so as to be in a state where the deformable contact member is directed toward an outer side of the container,wherein the restriction member extends in an axis direction of the developer holding body and is bonded to an opposite side of the deformable contact member to a surface of the deformable contact member which is fixed ...

Developing device and image forming apparatus including same

A developing device of the present disclosure includes a magnetic roller and a developing roller arranged so as to oppose the magnetic roller. Inside the magnetic roller, a regulation pole and a conveyance pole are provided. The regulation pole is turned toward an opposing surface side of an end portion of a regulation blade provided in a developer container. The regulation pole and the conveyance pole are arranged such that in magnetic fields formed by these magnetic poles, a point where no magnetic pole perpendicular to a surface of the magnetic roller is generated is located in a gap between the surface of the magnetic roller and the regulation blade.

Layer thickness regulating member, developing device and process cartridge

A layer thickness regulating member includes: an opposing portion opposing a peripheral surface of a developer carrying member; a layer thickness regulating portion, projecting from the opposing portion toward the developer carrying member, for regulating a layer thickness of a developer carried on the developer carrying member; and a rib portion provided in a side, of the opposing portion, opposite from the layer thickness regulating portion. The opposing portion, the layer thickness regulating portion and the rib portion are integrally molded. The rib portion is disposed at a non-overlapping position with a region, at least in an image forming region, corresponding to a region where the layer thickness regulating portion is formed at the opposing portion.

DEVELOPING DEVICE AND LAYER THICKNESS REGULATING MEMBER

A developing device includes: a developer carrying member and a layer thickness regulating member. The layer thickness regulating member includes: an opposing portion, a regulating portion, side wall portions, and a plurality of rib portions each extending from the side wall portion in one end side to the side wall portion in the other end side with respect to the rotational axis direction of the developer carrying member. A space is formed by being defined by the side wall portions and the rib portions. Substantial no rib portion dividing the space with respect to a longitudinal direction of said layer thickness regulating member is provided. 1. A developing device comprising:a developer carrying member for carrying a developer; anda layer thickness regulating member, integrally molded by a resin material, for regulating a layer thickness of the developer carried on said developer carrying member,wherein said layer thickness regulating member includes: an opposing portion opposing a peripheral surface of said developer carrying member; a regulating portion, provided on the opposing portion so as to project toward said developer carrying member, for regulating the layer thickness of the developer carried on said developer carrying member; side wall portions which are provided on the opposing portion so as to project in a rear side opposite from a front side where the regulating portion is provided and which are provided at end portions thereof with respect to a rotational axis direction of said developer carrying member; and a plurality of rib portions, provided on the opposing portion so as to project in the rear side, each extending from the side wall portion in one end side to the side wall portion in the other end side with respect to the rotational axis direction of said developer carrying member,wherein a space is formed in the rear side by being defined by the side wall portions and the rib portions, andwherein substantial no rib portion dividing the space ...

LAYER THICKNESS REGULATING MEMBER FOR REGULATING LAYER THICKNESS OF DEVELOPER CARRIED ON DEVELOPER CARRYING MEMBER AND LAYER THICKNESS REGULATING MEMBER MANUFACTURING METHOD

A layer thickness regulating member includes: an opposing portion having an opposing surface to a peripheral surface of a developer carrying member; and a layer thickness regulating portion, projected from the opposing surface toward the developer carrying member, for regulating a layer thickness of a developer carried on the developer carrying member. The layer thickness regulating portion is integrally molded with the opposing portion. The layer thickness regulating member is, after being molded in a metal mold, separated by being pushed from a side opposite from the opposing portion of the layer thickness regulating member when the layer thickness regulating member is separated from the metal mold. 1. A layer thickness regulating member comprising:an opposing portion having an opposing surface to a peripheral surface of a developer carrying member; anda layer thickness regulating portion, projected from said opposing surface toward the developer carrying member, for regulating a layer thickness of a developer carried on the developer carrying member, wherein said layer thickness regulating portion is integrally molded with said opposing portion,wherein said layer thickness regulating member is, after being molded in a metal mold, separated by being pushed from a side opposite from said opposing portion of said layer thickness regulating member when said layer thickness regulating member is separated from the metal mold.2. A layer thickness regulating member according to claim 1 , further comprising a rib portion provided in the side opposite from said opposing portion claim 1 ,wherein a free end surface of said rib portion is pressed when said layer thickness regulating member is separated from the metal mold.3. A layer thickness regulating member according to claim 2 , wherein said rib portion is provided at a non-overlapping position with a position corresponding to a position where said layer thickness regulating portion is provided.4. A manufacturing method ...

Developing device and image forming apparatus

A developing device includes a housing including a development opening and a containing unit that contains a developer, a developer carrier that rotates to pass through the development opening while holding the developer in the containing unit of the housing, an inlet portion of a flow path located in the housing at a portion including a downstream edge portion of the development opening on a downstream side in a rotation direction of the developer carrier, the inlet portion taking in part of an airflow caused by a rotation of the developer carrier to allow the part of the airflow to flow over an outer surface of the housing, and a guide member extending toward the developer carrier from a portion of the housing on a side of the inlet portion opposite to the development opening to guide the part of the airflow to the inlet portion.

DEVELOPING APPARATUS

A developing apparatus includes a sleeve for carrying a developer including toner and magnetic carrier, the sleeve having a plurality of grooves extending in a longitudinal direction; a magnet provided inside the sleeve, a non-magnetic regulating member, provided spaced from the sleeve, wherein an amount M/S (mg/mm) of the developer carried on a unit area of the sleeve after passing by the regulating member, a gap SB (mm) between a free end of the regulating member and the sleeve, a density G (mg/mm) of the developer, and a groove ratio α which is a ratio of the grooves in the surface of the sleeve satisfy, 133.-. (canceled)34. A developing apparatus comprising:a developer carrying member configured to carry a developer including toner and magnetic carrier to develop a latent image formed on an image bearing member, said developer carrying member including a developer carrying surface having a plurality of depressions;{'sub': '50', 'claim-text': [{'br': None, 'i': D', 'D, 'sub': '50', '(mm)>(mm)×½, and'}, {'br': None, 'i': ×D', 'W', 'D, 'sub': 50', '50, '10(mm)>(mm)>(mm),'}], 'wherein depths D (mm) of said depressions, widths W (mm) of said depressions, and a volume average particle diameter of the magnetic carrier D(mm) satisfy,'}a magnet, provided inside said developer carrying member, configured to attract the developer on said developing carrying surface; anda regulating member, provided spaced from said developer carrying surface, configured to regulate an amount of the developer carried on said developer carrying surface,{'sup': 2', '3, 'claim-text': [{'br': None, 'i': M/S', 'SB', 'D, 'sup': '2', '(mg/mm)×¼≤α×{(mm)+(mm)}, and'}, {'br': None, 'α<0.229.'}], 'wherein an amount M/S (mg/mm) of the developer carried on a unit area of said developer carrying surface after passing by said regulating member, a gap SB (mm) between a free end of said regulating member and said developer carrying member, a density G (mg/mm) of the developer, and a ratio α which is a ratio ...

SHAFTS WITH TAPERED BLADES

Example implementations relate to shafts with tapered blades consistent with the disclosure. For example, a device comprising a shaft, a blade with plurality of tapered surfaces, the surfaces tapered from a center of the shaft to an outer edge of the shaft, and a membrane attached to the plurality of tapered surfaces to facilitate print substance transport from the center of a print substance container towards the edges of the print substance container. 1. A device comprising:a shaft;a blade with plurality of tapered surfaces, the surfaces tapered from a center of the shaft to an outer edge of the shaft; anda membrane attached to the plurality of tapered surfaces to facilitate print substance transport from the center of a print substance container towards the edges of the print substance container.2. The device of claim 1 , further comprising the blade mounted on the shaft.3. The device of claim 1 , wherein the shaft further comprises:a solid surface portion; anda cored portion.4. The device of claim 1 , further comprising the membrane mechanically attached to the plurality of tapered surfaces.5. The device of claim 1 , wherein the membrane is shaped to be received by the plurality of the tapered surfaces of the blade.6. The device of claim 1 , the shaft further comprising two extended portions at each end of the shaft to couple to the print substance container.7. The device of claim 1 , further comprising the blade to couple to the shaft in response to receiving heat.8. A system comprising:a first print substance container;a second print substance container; and rotate print substance in the first print substance container; and', 'transport the print substance to the second print substance container, 'a shaft comprising a blade with plurality of tapered surfaces to9. The device of claim 8 , further comprising the plurality of tapered surfaces being tapered from a center of the shaft to an outer edge of the shaft.10. The device of claim 8 , wherein the first print ...

DEVELOPER SUPPLY CONTAINER AND DEVELOPER SUPPLYING SYSTEM

There are provided a developer accommodating portion for accommodating the developer, a discharge portion formed with a discharge opening for discharging the developer accommodated in the developer accommodating portion, and an engaging portion . The engaging portion is engaged with an engaged portion with a mounting operation of a developer supply container to displace a developer receiving portion in an upward direction U so that the receiving opening communicates with the discharge opening. The engaging portion has a holding portion which is provided rotatably about a rotation shaft and is provided with holding portion to be engaged with the engaged portion to hold the engaged portion . With the mounting operation, the engaging portion rotates about the rotation shaft so that the engaged portion held by the holding portion moves upward U. 1. A developer supply container detachably mountable to a developer receiving device , the developer receiving device including a developer receiving portion provided with a receiving opening for receiving a developer and an engaged portion integrally displaceable with the developer receiving portion , said developer supply container comprising:a rotatable developer accommodating portion for accommodating the developer;a discharging portion including a discharge opening for discharging the developer accommodated in said developer accommodating portion; andan engaging portion provided with a recess which is rotatable with the engaged portion engaged with said recess with a mounting operation of said developer supply container so as to displace the developer receiving portion in a displacing portion to bring the receiving opening and said discharge opening into fluid communication with each other.29.-. (canceled) The present invention relates to a developer supply container dismountably mountable to a developer receiving apparatus and a developer supplying system.Conventionally, in electrophotographic image forming apparatuses ...

IMAGE FORMING APPARATUS, CARTRIDGE, AND FRAME BODY USED FOR THE CARTRIDGE

To provide a structure that includes a small number of components, that is unlikely to be affected by heat, and that allows a blade secured to a frame body and a rotating member to be in contact with each other at a uniform pressure in a longitudinal direction. 1. A cartridge comprising:a rotatable rotating member;a blade that extends in an axial direction of the rotating member and that is in contact with or disposed close to a surface of the rotating member; a support member that supports the blade such that one end side of the blade projects toward the rotating member in a lateral direction that intersects the axial direction; anda frame body that is formed by insert molding in which resin is injected while the support member is secured to a mold and that clamps part of the support member so as to support the support member,wherein the frame body allows a movement of the support member in the axial direction.2. The cartridge according to claim 1 , wherein the frame body does not regulate the support member in the axial direction.3. The cartridge according to claim 2 ,wherein the support member has at least one notch portion so that the support member is positioned in the axial direction, andwherein the resin that forms the frame body is engaged with the at least one notch portion so as to position the support member relative to the frame body in the axial direction.4. The cartridge according to claim 3 , wherein the at least one notch portion includes a plurality of notch portions arranged at intervals in the axial direction claim 3 , and a length of each of the intervals is less than half a length of the support member in the axial direction.5. The cartridge according to claim 1 , wherein the frame body supports the support member such that one end portion of the support member in the axial direction is exposed from the frame body.6. The cartridge according to claim 5 ,wherein the support member has at least one notch portion,wherein, in the support member ...

DEVELOPING DEVICE AND IMAGE FORMING APPARATUS

A developing device includes a developing roller, a regulating blade, and seal members. The regulating blade extends in a rotation axis direction of the developing sleeve, is disposed opposite to a circumferential surface of the developing sleeve, and regulates a quantity of the toner present on the circumferential surface of the developing sleeve. The seal members are disposed opposite to the circumferential surface of the developing sleeve without being in contact with both ends of the developing sleeve in the rotation axis direction, and inhibit the toner on the circumferential surface from moving to the rotation axis direction ends by magnetic brushes formed between the magnet roller and the seal members. An inner surface part of each seal member which is opposite to the circumferential surface of the developing sleeve has root parts which have crest parts formed in a serrated shape. 1. A developing device comprising:a developing roller configured to include a magnet roller having numerous magnetic poles in a circumferential direction thereof and a roller-shaped developing sleeve sheathed on the magnet roller and to feed toner to a photosensitive drum;a regulating blade configured to extend in a rotation axis direction of the developing sleeve, disposed opposite to a circumferential surface of the developing sleeve, and configured to regulate a quantity of the toner present on the circumferential surface of the developing sleeve; andseal members disposed opposite to the circumferential surface of the developing sleeve without being in contact with both ends of the developing sleeve in the rotation axis direction, and configured to inhibit the toner on the circumferential surface from moving to the rotation axis direction ends by magnetic brushes formed between the magnet roller and the seal members,wherein an inner surface part of each seal member which is opposite to the circumferential surface of the developing sleeve has root parts which extend in the ...

DEVELOPING DEVICE AND IMAGE FORMING APPARATUS

A developing device includes a developing roller, a regulating blade, seal members, and contact members. The regulating blade extends in a rotation axis direction of the developing sleeve, is disposed opposite to a circumferential surface of the developing sleeve, and regulates a quantity of the toner on the circumferential surface of the developing sleeve. The seal members are disposed opposite to the circumferential surface without being in contact with both ends of the developing region in the rotation axis direction. Each contact member is an edge on the developing region side in the rotation axis direction, provided at a position at an upstream side in a rotational direction of the circumferential surface of the developing sleeve relative to an arrangement position of the regulating blade, and configured to be in contact with the circumferential surface of the developing sleeve. 1. A developing device comprising:a developing roller configured to include a magnet roller having numerous magnetic poles in a circumferential direction thereof and a roller-shaped developing sleeve sheathed on the magnet roller and to feed toner to a photosensitive drum;a regulating blade configured to extend in a rotation axis direction of the developing sleeve, disposed opposite to a circumferential surface of the developing sleeve, and configured to regulate a quantity of the toner present on the circumferential surface of the developing sleeve;seal members disposed opposite to the circumferential surface without being in contact with both ends of the developing region in the rotation axis direction on the circumferential surface of the developing sleeve, and configured to inhibit the toner on the developing region from moving to the rotation axis direction ends by magnetic brushes formed between the magnet roller and the seal members; andcontact members, each configured as an edge on the developing region side in the rotation axis direction on an inner circumferential surface of ...

Toner for electrostatic-image development and toner cartridge containing the same therein

The object of the invention is to provide a toner for electrostatic-image development which imparts excellent image quality and a toner cartridge employing the toner. The invention relates to a toner for electrostatic-image development, which satisfies the following requirements (1) and (2): (1) the toner has an average transporting property of 2.9 to 15.1 mg/sec; and (2) the product of the BET specific surface area (m 2 /g) and volume-average particle diameter (μm) of the toner is 7.7×10 −6 to 11.0×10 −6 (m 3 /g).

Development device and image forming apparatus

A development device includes a developer carrier, a blade and a cover. The developer carrier carries a developer containing a toner. The blade regulates a thickness of the developer carried on the developer carrier. The cover includes a cover main body covering an outer side of the blade and a facing rib protruding from an inner face of the cover main body and facing the developer carrier at an interval. A storage space to store the toner which contacts the facing rib and falls is formed below the facing rib.

Developing assembly, process cartridge, and image-forming apparatus

In a developing assembly, the surface of a developer bearing member on which a developer is borne is provided with a first dielectric portion and a second dielectric portion. A regulating portion that regulates the layer thickness of the developer borne on the developer bearing member, the first dielectric portion, and the second dielectric portion each have a charge polarity opposite to the charge polarity of the developer. In a triboelectric series, one of the first dielectric portion and the second dielectric portion is positioned between the developer and the other dielectric portion, and the other dielectric portion is positioned between the one of the dielectric portions and the regulating portion.

Developing device and image forming apparatus

A developing device includes a developing agent bearing member and a regulating member. The developing agent bearing member bears on a surface thereof a developing agent including colored particles and additive particles disposed on the surface of the colored particles. The surface of the developing agent bearing member includes first and second dielectric portions. The regulating member regulates the thickness of a layer of developing agent borne by the developing agent bearing member. In triboelectric series, the first dielectric portion is between the regulating member and the additive particles, the additive particles are between the first dielectric portion and the second dielectric portion, and the second dielectric portion is between the additive particles and the colored particles. The difference between the work functions of the colored particles and second dielectric portion is smaller than that between the second dielectric portion and additive particles.

DEVELOPING DEVICE AND IMAGE FORMING APPARATUS

A developing device includes a developer bearing member that bears a developer on its surface to supply the developer to an image bearing member having a first dielectric portion and a second dielectric portion in its surface, a regulating member that regulates a thickness of a layer of the developer carried by the developer bearing member, and a flexible sheet-like charging auxiliary member disposed so as to be in contact with the developer bearing member at a position downstream of a contact portion between the developer bearing member and the image bearing member and upstream of a contact portion between the developer bearing member and the regulating member in a rotational direction of the developer bearing member, where the charging auxiliary member charges the developer carried by the developer bearing member. In a triboelectric series, the charging auxiliary member is positioned between the first and second dielectric portions. 1. A developing device comprising:a developer bearing member configured to bear a developer on a surface thereof in order to supply the developer to an image bearing member, the developer bearing member having a first dielectric portion and a second dielectric portion in the surface thereof;a regulating member configured to regulate a thickness of a layer of the developer carried by the developer bearing member; anda flexible sheet-like charging auxiliary member disposed so as to be in contact with the developer bearing member at a position downstream of a contact portion between the developer bearing member and the image bearing member and upstream of a contact portion between the developer bearing member and the regulating member in a rotational direction of the developer bearing member, the charging auxiliary member charging the developer carried by the developer bearing member,wherein in a triboelectric series, the charging auxiliary member is positioned between the first dielectric portion and the second dielectric portion.2. The ...

IMAGE FORMING APPARATUS INCLUDING LAYER THICKNESS CONTROL PORTION TO CAUSE ROTATOR TO CARRY TONER, AND DEVELOPING DEVICE USED IN IMAGE FORMING APPARATUS

An image forming apparatus includes a rotator, a driving control portion, and a layer thickness control portion. The rotator conveys toner to contact position to an image carrying member, and supplies toner to the image carrying member at the contact position. The driving control portion controls rotation of the rotator so as to rotate the rotator during a developing period, and stop the rotation of the rotator after a set time has elapsed since an end of the developing period. The layer thickness control portion causes the rotator to carry toner by controlling a potential difference between a potential of the rotator and a predetermined potential so that toner on the rotator at the contact position has a first layer thickness during the developing period and has a second layer thickness while the rotation of the rotator is stopped, the second layer thickness being thicker than the first layer thickness. 1. An image forming apparatus , comprising:a rotator rotatably supported and configured to receive toner at a predetermined reception position, carry and convey the toner to a contact position at which the rotator contacts an image carrying member on which an electrostatic latent image is formed based on image data, and supply the toner to the image carrying member at the contact position;a driving control portion configured to control rotation of the rotator so as to rotate the rotator during a developing period in which the electrostatic latent image is developed, and stop the rotation of the rotator after a predetermined set time has elapsed since an end of the developing period; anda layer thickness control portion configured to cause the rotator to carry the toner by controlling a potential difference between a potential of the rotator and a predetermined potential so that the toner on the rotator at the contact position has a first layer thickness during the developing period and has a second layer thickness while the rotation of the rotator is stopped, the ...

STAGGERED DOCTOR BLADES FOR PRINTERS AND MULTIFUNCTION PERIPHERALS

A system and method for producing a uniform layer of toner on a developer roller of a toner-based printer includes two or more doctor blades that are configured to reduce the amount of toner deposited on the developer roller in successive steps. A first doctor blade reduces the layer of toner to a first depth, and a second doctor blade further reduces the layer of toner to a second depth. A third or subsequent doctor blade can further reduce the layer of toner to a third depth. An electrical charge applied to one or more of the doctor blades produces a substantially uniform charge to the layer of toner on the developer roller. 1. An apparatus , comprising:a plurality of doctor blades configured to distribute a substantially uniform layer of toner onto a developer roller of a toner-based printer,wherein a first doctor blade is configured to reduce the layer of toner on the developer roller to a first depth,wherein a second doctor blade is configured to further reduce the layer of toner on the developer roller to a second depth,wherein a third doctor blade is configured to further reduce the layer of toner on the developer roller to a third depth, andwherein the first doctor blade is oriented so as to extend radially from an axis of the developer roller,wherein the second doctor blade is oriented so as to extend radially from the axis of the developer roller, andwherein the third doctor blade is oriented so as to extend radially from the axis of the developer roller.2. (canceled)3. The apparatus of claim 2 , wherein the second doctor blade is displaced closer to the developer roller than the first doctor blade is displaced from the developer roller claim 2 , and wherein the third doctor blade is displaced closer to the developer roller than the second doctor blade is displaced from the developer roller.4. The apparatus of claim 3 , wherein the first doctor blade is displaced at a distance of approximately 1.78 mm from the developer roller claim 3 , wherein the second ...

IMAGE FORMING APPARATUS

Provided is an image forming apparatus including voltage applying unit for applying voltages to a developer carrier in which a surface that carries a developer is configured so that a plurality of dielectric portions is interspersed on a surface formed of a conductor portion, and to a regulating member that regulates a layer thickness of the developer that is carried on the developer carrier. The voltage applying unit has a period, during non-image formation, over which voltage such that an absolute value of potential difference between voltage applied to the developer carrier and voltage applied to the regulating member is greater than that during image formation is applied to at least one of the developer carrier and the regulating member. 1. An image forming apparatus , comprisinga developing apparatus including:a container that holds a developer;a developer carrier in which a surface that carries the developer is configured so that a plurality of dielectric portions is interspersed on a surface formed of a conductor portion; anda regulating member that regulates a layer thickness of the developer that is carried on the developer carrier,the image forming apparatus forming an image on a recording material by developing, using the developing apparatus, an electrostatic latent image formed on an image bearing member to yield a developer image, and transferring the developer image from the image bearing member to the recording material,the image forming apparatus further comprising:voltage applying unit for applying voltages to the developer carrier and the regulating member,wherein the voltage applying unit has a period, during non-image formation, over which voltage such that an absolute value of potential difference between voltage applied to the developer carrier and voltage applied to the regulating member is greater than that during image formation is applied to at least one of the developer carrier and the regulating member.2. The image forming apparatus ...

DEVELOPING DEVICE AND IMAGE FORMING APPARATUS

Provided is a developing device including a developer carrier that holds developer, a supply member that supplies the developer to the developer carrier while agitating the developer, a transport member that is disposed obliquely upward in a vertical direction of the supply member, delivers and transports the developer with agitating the developer through a passageway portion provided at each end portion in an axial direction of the supply member, and a regulating member that is provided at a position corresponding to the passageway portion that delivers the developer from the supply member to the transport member, to regulate movement of the developer from the supply member to the developer carrier. 1. A developing device comprising:a developer carrier that holds developer;a supply member that supplies the developer to the developer carrier while agitating the developer;a transport member that is disposed obliquely upward in a vertical direction of the supply member, delivers and transports the developer with agitating the developer through a passageway portion provided at each end portion in an axial direction of the supply member; anda regulating member that is provided at a position corresponding to the passageway portion that delivers the developer from the supply member to the transport member, to regulate movement of the developer from the supply member to the developer carrier.2. The developing device according to claim 1 , whereinthe regulating member blocks a space formed between the supply member and the developer carrier to regulate the movement of the developer from the supply member to the developer carrier.3. The developing device according to claim 1 , whereinthe developer carrier includes a cylindrical developer transport member and a magnetic field generating member that is fixedly disposed in the developer transport member and has a plurality of magnetic poles, anda side surface of the regulating member positioned at a side of the supply member is ...

DEVELOPING APPARATUS

A developing apparatus includes a developing container configured to accommodate a developer containing toner and carrier, a developing sleeve rotatably supported by the developing container and configured to carry the developer from the developing container, and a magnet provided in the developing sleeve and having a plurality of magnetic poles arranged in a circumferential direction. In addition, a regulating member is provided opposite to the developing sleeve with a predetermined gap therebetween and configured to regulate a layer thickness of the developer carried on the developing sleeve. The magnetic poles include a regulation pole disposed opposite to the regulating member. 1. A developing apparatus comprising:a developing container configured to accommodate a developer containing toner and carrier;a developing sleeve rotatably supported by the developing container and configured to carry the developer from said developing container; anda magnet provided in said developing sleeve and having a plurality of magnetic poles arranged in a circumferential direction; anda regulating member provided opposed to said developing sleeve with a predetermined gap therebetween and configured to regulate a layer thickness of the developer carried on said developing sleeve,wherein said magnetic poles include a regulation pole disposed opposed to said regulating member, and said regulation pole is disposed such that a maximum value position at which a magnetic flux density in a normal line direction of said developing sleeve is a maximum is not less than 3° away in a circumferential direction of said developing sleeve from a half peak center portion position which is a center portion position of a half-peak width of the magnetic flux density, and wherein said regulating member is disposed in a side of the maximum value position including the center portion position with respect to the circumferential direction of said developing sleeve.2. An apparatus according to claim 1 , ...

DEVELOPING APPARATUS, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS

A developer used in a developing apparatus equipped with a metal blade includes a toner base particle and external additives, the external additives including a silica particle with a particle diameter of 5 nm or more and 25 nm or less and an inorganic spacer particle with a particle diameter of 50 nm or more and 150 nm or less, and an area occupancy of the silica particle on a surface of the toner base particle is 40% or more. 1. A developing apparatus , comprising:a developing frame configured to store a developer;a developer bearing member rotatably supported by the developing frame and configured to bear the developer; anda regulation member including a metal blade, the metal blade having one end fixed to the developing frame and the other end arranged in contact with the developer bearing member, the regulation member regulating a thickness of the developer borne on the developer bearing member,wherein the developer includes a toner base particle and external additives,the external additives include a silica particle with a particle diameter of 5 nm or more and 25 nm or less, and an inorganic spacer particle with a particle diameter of 50 nm or more and 150 nm or less, andan area occupancy of the silica particle on a surface of the toner base particle is 40% or more.2. The developing apparatus according to claim 1 , wherein the other end of the metal blade is arranged to extend toward an upstream side in a rotation direction of the developer bearing member.3. The developing apparatus according to claim 2 , wherein claim 2 , in a state in which the developer bearing member is not assembled and the regulation member is assembled in the developing frame claim 2 ,when looking along a rotation axis direction of the developer bearing member, and when the developer bearing member is imaginarily assembled into the developing frame,an intersection, at which a front edge surface at the other end of the metal blade intersects an abutment surface thereof abutting with the ...

Developing apparatus

A developing apparatus for use in an image forming apparatus includes a developing frame, a rotatable developing member, a regulation blade to regulate developer borne on a developing member surface, and a seal member to prevent developer from leaking outside the developing frame. The regulation blade includes a support plate, a plate-shaped member, and a regulation member. The seal member is fixed to a facing surface of the plate-shaped member, is arranged at a plate-shaped member end portion, is arranged side by side with the regulation member in a rotational axis direction, contacts an end surface of the regulation member, and is disposed between the plate-shaped member and the developing member in a direction intersecting with the rotational axis direction. The plate-shaped member is welded to a region of the support plate excluding a region outside the end surface of the regulation member in the rotational axis direction.

IMAGE FORMING APPARATUS

An image forming apparatus including a rotatable developer container; a receiving device which receives the container which is inserted in a direction along a rotational axis of the container and which receives the developer discharged from the container when the container is in a first position; and a regulating member provided on the container, the regulating member being effective to prevent, during transportation of the image forming apparatus, the container from moving to the first position from a second position which is upstream of the first position with respect to an inserting direction of the container and in which the developer is not discharged from the container. 1. An image forming apparatus comprising:a rotatable accommodating container configured to accommodate a developer;a receiving device which is configured to receive said accommodating container which is inserted in a direction along a rotational axis of said accommodating container and which is configured to receive the developer discharged from said accommodating container when said accommodating container is in a first position; anda regulating member provided on said accommodating container, said regulating member being configured to prevent, during transportation of said image forming apparatus, said accommodating container from moving to the first position from a second position which is upstream of the first position with respect to an inserting direction of said accommodating container and in which the developer is not discharged from said accommodating container.2. An apparatus according to claim 1 , wherein said accommodating container is provided with a discharge opening for discharging the developer claim 1 , and is provided with a shutter for opening and closing said discharge opening claim 1 , and wherein said shutter takes a position for closing said discharge opening claim 1 , in the second position of said accommodating container.3. An apparatus according to claim 1 , wherein ...

DEVELOPING CARTRIDGE

A cartridge attachable to a main body of an image forming apparatus, the cartridge including a developer bearing member, a frame supporting the developer bearing member, a developing blade including a regulating member and a support member, and a collecting member. The collecting member includes a containing portion. The collecting member includes an opening opposing the developer bearing member. The containing portion extends in a rotational axis direction of the developer bearing member, and a sectional area of a longitudinal end portion area of the containing portion, orthogonal to the rotational axis direction, corresponding to a longitudinal end portion of the developer bearing member is larger than that of a longitudinal middle portion area of the containing portion. 1. A cartridge detachably attachable to an apparatus main body of an image forming apparatus , the cartridge comprising:a developer bearing member that bears developer on a surface thereof;a frame that supports the developer bearing member so that the developer bearing member is rotatable; a regulating member that regulates a thickness of a layer of the developer borne on the surface of the developer bearing member, and', 'a support member that is fixed to the frame and that supports the regulating member; and, 'a developing blade including'}a collecting member that collects the developer scattered from the developer bearing member, the collecting member including a containing portion that is supported by the support member and contains the developer that has been collected, the containing portion including an opening through which the developer is collected and which opposes the developer bearing member, the containing portion extending in a rotational axis direction of the developer bearing member, a sectional area of a longitudinal end portion area of the containing portion, orthogonal to the rotational axis direction, corresponding to a longitudinal end portion of the developer bearing member ...

IMAGE FORMING APPARATUS

An image forming apparatus includes: a drum unit having a photosensitive drum: a developing device having a developing roller that supplies toner to the image bearing member and a developer container that rotatably supports the developing roller; and a main apparatus body to which the drum unit and the developing device are detachably attached. The drum unit and the developing device are integrally attachable to and integrally detachable from the main apparatus body. The developer container includes a pair of ribs on an upper surface thereof at positions corresponding to opposite axial ends of the developing roller. The ribs abut against a casing part of the main apparatus body while the drum unit and the developing device are being integrally attached to and integrally detached from the main apparatus body. 1. An image forming apparatus comprising:an image bearing unit that includes an image bearing member on which an electrostatic latent image is formed; a developing roller that is disposed opposite to the image bearing member and supplies toner to the image bearing member, and', 'a first housing that stores therein developer containing the toner and rotatably supports the developing roller; and, 'a developing device that includes'}a main apparatus body to which the image bearing unit and the developing device are detachably attached, whereinthe image bearing unit and the developing device are integrally attachable to and integrally detachable from the main apparatus body, andthe first housing includes a pair of ribs on an upper surface thereof at positions corresponding to opposite axial ends of the developing roller, the ribs abutting against a casing part of the main apparatus body while the image bearing unit and the developing device are being integrally attached to and integrally detached from the main apparatus body.2. The image forming apparatus according to claim 1 , further comprisinga second housing that houses the image bearing unit, whereinthe ribs ...

IMAGING SYSTEM

An imaging system includes a developing roller connected to a supply channel to supply a developing agent and to transfer toner in the developing agent to a photosensitive drum at a supply position, a regulation member located adjacent to the developing roller at an upstream side of the supply position to restrict a thickness of the developing agent; and a casing that forms a release chamber in the periphery of the developing roller between an upstream side of the regulation member and a downstream side of the supply position. The release chamber includes an outlet to discharge scattered toner to an inlet of the supply channel. 1. An imaging system comprising:a developing roller connected to a supply channel to supply a developing agent including toner and to transfer the toner in the developing agent stored therein to a photosensitive drum at a supply position between the developing roller and the photosensitive drum;a regulation member located adjacent to the developing roller at an upstream side of the supply position to restrict a thickness of the developing agent carried on the developing roller; anda casing that forms a release chamber in a periphery of the developing roller between an upstream side of the regulation member and a downstream side of the supply position to collect scattered toner, the release chamber having an outlet to discharge the scattered toner to an inlet of the supply channel.2. The imaging system according to claim 1 ,wherein the outlet of the release chamber is formed in the casing.3. The imaging system according to claim 1 , comprising a discharge channel that connects the outlet of the release chamber to the inlet of the supply channel.4. The imaging system according to claim 3 ,wherein the discharge channel is located above the developing roller when the toner is transferred to the photosensitive drum by the developing roller.5. The imaging system according to claim 3 ,{'sup': '2', 'wherein a cross-sectional area of the discharge ...

DEVELOPING CARTRIDGE INCLUDING BLADE AND BLADE HOLDER FOR SUPPORTING END PORTION OF BLADE

A developing cartridge includes: a casing having a groove recessed inward; a developing roller having an outer circumferential surface; a blade; and a blade holder having a first plate and a second plate. The developing roller is rotatable about a rotational axis extending in a first direction. The blade regulates a thickness of toner layer on the outer circumferential surface. The blade has one end portion and another end portion in a second direction. The another end portion of the blade is positioned farther from the outer circumferential surface than the one end portion of the blade is from the outer circumferential surface. The first plate extends in the second direction and supports the another end portion of the blade. The second plate extends from the first plate in a third direction crossing the second direction to have a distal end portion positioned within the groove. 1. A developing cartridge comprising:a casing configured to accommodate toner therein, the casing having a groove recessed inward of the casing;a developing roller rotatable about a rotational axis extending in a first direction, the developing roller having an outer circumferential surface;a blade configured to regulate a thickness of a layer of toner formed on the outer circumferential surface of the developing roller, the blade extending in a second direction toward the outer circumferential surface of the developing roller and having one end portion and another end portion in the second direction, the another end portion of the blade being positioned away from the one end portion of the blade in the second direction, the another end portion of the blade being positioned farther from the outer circumferential surface of the developing roller than the one end portion of the blade is from the outer circumferential surface of the developing roller; and a first plate extending in the second direction and supporting the another end portion of the blade; and', 'a second plate extending from the ...

DEVELOPING APPARATUS HAVING THICKNESS REGULATING MEMBER, SEALING MEMBER, AND RESTRICTING MEMBER

In a developing apparatus, a sealing member has a first part contacting an axial end part of a developing roller and a second part including a first side surface. A roller body of a supply roller includes a contact surface that contacts the peripheral surface, and a second side surface located at an end of the contact surface in the axial direction. The restricting member has a one side and another side. The one side is opposed to the second side surface in the axial direction. The another side is opposed to the first side surface in the axial direction with a gap. The gap is communicated with an interior space of a developer accommodating frame such that the developer is capable of moving away from a nip position between the supply roller and the developing roller toward the bottom wall of the developing frame in the gap. 1. A developing apparatus comprising:a housing including: a developer accommodating frame configured to accommodate developer; and a developing frame communicated with the developer accommodating frame, the developing frame including a supply-roller accommodating part and a bottom wall;a developing roller rotatably supported by the supply-roller accommodating part and having a peripheral surface configured to carry the developer, the peripheral surface extending in an axial direction and including an axial end part;a supply roller rotatably supported in the developing frame, contacting the developing roller at a nip position, and configured to supply the toner to the developing roller, the supply roller being shorter than the developing roller;a thickness regulating member including a contact member contacting the developing roller, the contact member being configured to regulate a thickness of the developer on the developing roller;a sealing member located in the developing frame and having a first part contacting the axial end part and a second part including a first side surface; anda restricting member located in the developing frame,wherein ...

DEVELOPING DEVICE

Only both end portions of a developer regulating member are supported by a developing container such that the developer regulating member cannot rotate, a size of an area of a cross section orthogonal to a rotational axis of a developer bearing member of the developer regulating member is smaller than 28 mm, a magnitude of second moment of area in a normal direction of the developer bearing member with respect. to a centroid of the cross section orthogonal to the rotational axis of the developer bearing member of the developer regulating member is larger than 25 mm, and a magnitude of a second moment of area in a tangent direction of the developer bearing member with respect to the centroid of the cross section orthogonal to the rotational axis of the developer bearing member of the developer regulating member is larger than 70 mm. 1. A developing device comprising:developing container configured to store developer including toner and a magnetic carrier;a developer bearing member rotatably provided and configured to bear the developer to develop an electrostatic latent image formed on an image bearing member;a magnet fixedly placed within the developer bearing member and configured to generate a magnetic field for the developer bearing member to bear the developer; anda developer regulating member placed not in contact with the developer bearing member so to be opposed to the developer bearing member, configured to be magnetized by an external magnetic field, and configured to regulate an amount of developer borne on the developer bearing member,wherein only both end portions of the developer regulating member are supported by the developing container such that the developer regulating member cannot rotate,{'sup': '2', 'wherein a size of an area of a cross section orthogonal to a rotational axis of the developer bearing member of the develop regulating member is smaller than 28 mm,'}{'sup': '4', 'wherein a magnitude of a second moment of area in a normal direction ...