Improvement with the sewing machines at hidden point
FRENCH REPUBLIC. IP service. Patent. Gr. 5.-Cl. 7. No. 941.623 Improvements to machines hidden stitch sewing. Said Society; STITCH MACHINE LEWIS [...] Companyresiding in the United Statesof America. Demanded 16 April 1946, to 16m July 19/18 Issued the a6.-Published 17 January 19/19, ( [...] Request deposited in the United States of America [...] 29 July 1, the name il. Charles W. Mueller.-Declaration the applicant.) In certain types of sewing machines to. hidden point, in particular the small machines working at high speed, it has been by- current tick mounting the folding book on the work table. It is necessary that the for folding work capable of bending [...] to allow the passage of seams and it is also need to be arranged so that it can disengage from the presser foot for introducing or removing the or- [...]. To date, and prior to the present invention, it was common practice make the entire work table [...] can flex. Hereinafter, the for folding was mounted on a work table structure capable of bending, and it is of the same work-carrier, which is composed of two plates independently movable holder- both the work against the presser foot. A high thrust is required for hand- holding the folding-position when a fold or fabric loop is formed through the or- opening of the presser foot. The thrust is robust exerted by a spring which, in the construction mentioned, acts on the table. To open the machine for in- [...] or remove the work, the operator must robust overcome the resistance of the spring ma- internal, usually by exerting a pushed by knee on a pressure plate. The present invention relates to improvements to machines hidden stitch sewing comprising a construction in which the machine can be opened without the need, overcome the resistance of the high force which holds the folding [...] in the working position. The invention further comprises a ' construction in which the door- [...] can be brought away from the presser foot independently of the work and for folding it comprises, further,s a construction in which, by a single manual operation, the work is fed away from the presser foot and the folding work is also supplied to the deviation of the presser foot, " thereby causing a large unobstructed opening for the introduction or removal of the or- [...]. -- Goals [...] top and some advantages that shall become apparent from the following, are made, in the embodiment shown in the example in the accompanying drawings on which: The fig. 1 is a plan view of a machine according to the invention; The fig. 2 is a front view of the am-The fig. 3 is a vertical cross section of partial face along the line 3-3 of fig. 1; £The g. 4 is a horizontal section line 4-4 of the cartridge according to fig. 2; The fig. 5, 6, 7, 8, 9, 19 and 11 are partial vertical sections along the lines irregular 5-5,6-6,7-7,8-8,9-9, respectively 10-10 and 11-11 of fig. 3; The fig. 12 and 13 represent elevation [...] parts of the machine in two different positions of their movement. The machine represented comprises a frame on which is mounted the entire mechanism. The framework includes a base 1, a column 2 attached to said base at the rear, an arm 3 extending from the upper end of the column, an arm 4 attached to the end of the arm 3 and extending frontward and a work table 5 fixed to the base at the front of said base and extending to the arm 4. The various sections of the frame are hollow and the machine mechanism is mounted within the sections. The sewing machine is operated by a main shaft 6 journaled in the column 2 and in the arm 3. The shaft passes through the column and carries a pulley 7, combined with a hand wheel 8. The pulley is driven by a belt 9 from shaft of an engine or an electric motor, not shown. 3Sur the end of the arm 4 is a presser foot 10, cantilevered above the end of the table 5. The work is supported against the presser foot. This is of the usual construction and well known and pre- [...] an opening 11 which extends through the housing and through which pass dice nodes or folds of the worked material, during operation of the machine. The mechanism stitch forming 4du common type and is well known in the sewing machines of this type. A shaft needle bar 12 is supported in the arm 4 and passes through the end of this arm. On the extended end of the shaft is mounted a needle bar 13 which carries a curved needle 14. Through suitable connections with the main shaft, the shaft 12 receives an oscillating motion. to cause movement of the needle across the [...] of the presser foot. The particular machine represented is a chain stitch machine and is provided with a sulky 15 which cooperates with the needle for forming the dots. However, the invention is not limited to a hidden point chain stitch, ai) since it also is applicable to a; point hidden from machine stitch the like. The work, are used is supported, in the region of the seam line, 6 O against the bottom face of the presser foot by -a work-carrier composed of two work-carrier plates 16 and 17. These plates are mounted for independent pivotal and [...] b 3 moving in a direction toward and away from the presser foot. They are biased axially towards the presser foot. Both are mounted in the same manner. The mounting the plate 17 (fia. 10 and 11) comprises a lever 7° 18, in the form of an angled lever, which is mounted to oscillate on a shaft 19. One of the armshas lever 18 is curved, as shown, and a boss 18b is formed at its end. A pivot 20 is mounted in said boss and in 7has projection relative thereto. A lug 17has the plate 17 is mounted oscillating on the pivot 20. On a 18e other arm of the lever 18 is attached one end of a spring 21 whose other end is attached to an anchoring rod _AOUNI167AO> adjustable threaded 0 22 which is screwed through an opening in the side wall of the work table 5. A lock nut 23 secures the anchor rod in an adjustable position. The spring 21 is relatively light, since the role of the stages is only 85 applying the portion of the work to be worked on against the presser foot. The end portion of the work table, which extends beneath the presser foot is 9° located at a distance much larger of the presser foot as the board conventional work machines of this type. The interval between the table and the presser foot is sufficient, when it is released from, the [...] and to allow easy removal of the work between these members. To facilitate insertion and removal of the work, the sinkers are erasable, the table being fixed. To this end, the lever 18 of the plate 17 is provided with a projectiond [...] 18. A like projection is formed on the corresponding lever for the platinum 16, this projection being indicated by 16'. Below these projections (fig. 2, 4, 7, 10 and 11) and [...] at a distance from said projections is a rod 24 extending from a socket or collar 25 attached to a shaft 26 (fig. 4). The rod 24 is normally located in some distance from the projections 18 '1, 16' to allow a limited independent movement of the plates. When a rotation, in the counterclockwise direction, on the fig. 10 and 11 is communicated to the shaft 26, the [...] levers supporting the plates (for example the lever 18J are actuated to bring the plates to a position away from the presser foot, this position being indicated for the plate 17 in fig. 10. 15 Rotation communicated to the shaft 26 to disengage the plates is obtained by a manual operation, using a die pressure operated 27 using the knee (Figure 1 and 2). " 2 0 The pressure member 27 is fixed to a portion offset 28has a rod 28 which is attached, via a coupling member 29 (fig. 10,11) to a rod 30. The shaft penetrates inside the base 1 and is supported in the dock 2,0. In the base 1 (fig. 4, 5, 6, 10 and 11) is attached to the rod 30 a lever 31. At the end of the lever is pivotally attached one end of a link 32 whose other end is fixed so as 3 O to the end of a lever 33 attached to the shaft 26. When the member 27 of pressure with the aid of the knee (Figure 1 and 2) is moved to the right, the shaft 30 rotates in the counterclockwise direction, the lever 35,31 (fig. 4,5 and 6) pulls the link 32 downward and the shaft 26 rotates to disengage the plates, causing them to their "open" position, remote from the presser foot. The mechanism for presenting the work 4 O to the needle includes a folding oscillating book 34 (fig. 11) having the shape of a sector. This member (fig. 4) is mounted on the [...] of a shaft 35 which is supported in spaced bearings 36 and 37 of a cradle 38. The 4 cradle 38 is pivotally mounted on a centring pins 39 and 40 screwed through bosses 41 and 42 projecting inwards from the side wall of the table 5. The cradle 38 (Figure 3 and 4), and therefore 5 folding o the book 34, is elastically held, robust by a spring 43, set in a working position. One end of the spring is secured to a pad 44 projecting on the cradle, and the other end is fixed to a threaded anchoring pin and adjustable 55,45, threaded through. " an opening of the front wall of the table to work. The force exerted on the cradle by the spring 43 can be adjusted to a limited extent by adjusting the, threaded stud 45. The manifold is held, 6o in its set position by a lock nut 46. Book The folding receives an oscillating motion in synchronism with the formation mechanism of point and-d drive, In the upper position, adjacent the foot pressing 65 (fig. 8), the folding work causes a folded portion of the material to be worked on to pass through the opening of the presser foot. to come in the path of the needle. After the passage of the needle, of the folding work is returned to a position away from the presser foot. This movement results from the oscillation of the shaft 35. When-reinforcements of the material, e.g. seams, pass there, it is necessary that the folding [...] book. Therefore, it is resiliently mounted as previously described. The position of the folding in the forming position of a fold, relative to the presser foot, determines the depth the fold and, therefore, the depth of penetration of the needle. In the machine represented, the penetration of the needle is adjustable by adjusting the cradle 38, that is say by limiting the motion of the cradle under the action of the spring 43. To this end, the cradle is provided with a lower arm 47 at the end of which is provided an opening 48 (fig. 7) milled j preferably spherical. A screw 49, with a head 50 that is complementary g of the countersink, passes through the opening; and the stem of this screw, whose _AOE280A2AO> diameter is smaller than that of the opening, is screwed into the end of a rod 52. The other end of the bar carries a ball housing 53 which receives a ball 54 g, attached to a lever 55. This is. fixed to one of the ends d ' a. shaft 56 supported by an ear 57 of the frame. On the other end of the shaft 56 is fixed another lever 57' which is connected, by a link 58, to a movable block 59, slidably mounted in the column 2. A threaded rod 60 carrying a wheel 60 operation 'is screwed into the block 59 and constitutes the device by ^ means which controls the depth of penetration' of the needle. Â using the shaft to wheel 60, is placed the head of the screw 49 in a position such as to be-comprises as a stop for the cradle. This is however free to flex elastically under a force acting on the work for folding. Book The folding receives a swinging movement of the main shaft through a mechanism which oscillates the shaft 35. The mechanism includes an eccentric 61 (fig. 7) mounted ' on the main shaft and a eccentric collar 62 surrounding the eccentric. A eccentric rod, one end of which is connected to the collar is connected to, by a ball joint, at its other end, at the end of a lever 64. This is supported by a sleeve 65, mounted loose on a shaft 66 to [...] of the base 1. Another lever 67, carried by the sleeve 65, is connected by a ball-joint to one end of a connecting rod 68 whose other end is connected via a ball joint to one end of a lever 69. The lever 69 is pivoted at a point inter- [...] of its length on a shaft pivot 70 (fig. 8) which is rigidly coupled to a shaft 71 ( [...]. 6) supported by a transverse support arm 72 (fig. 3) in the base 1, this shaft-pivot 70 being eccentric relative to the shaft 71. The other end of the lever 69 is connected via a ball joint to an arm 74, provided at the end of the shaft 35 (fig. 8). When the main shaft rotates, the eccentric 61 oscillates the levers 64 and 67, which, by means of the connecting rod 68, swings the lever 69. The oscillation of the lever 69 is transmitted by the link 73 and the arm 74 to the shaft 35. On Fig. 8, the connecting rod 68 is represented in an extreme position. In this position of the connecting rod, the folding work 4 34 occupies the position for forming a fold or node. Figure 9 represents the same parts in the opposite position. In this position, for folding the work has been moved clear of the presser foot. 73 The link connecting the lever 69 and the arm 74 allows the shaft 35 to move substantially vertically when it is necessary that the folding d-' structure flexes. From the fig. 8 and 9 that, even when the work-carrier [...] are released from, the work for folding would obstruct the opening and would obstacle to the introduction of the structure between the pressure foot and the strips or removal. Therefore, The clearance to the hand of the onf for folding) q [...] is performed by the rotation of the shaft 71 which causes movement of the pivot pin 70. The pinion 76 bears on one of its side faces, a stud 78 constituting a crank pin which is The normal position of the stud 78 (fig. The normal position of the shoe 79 (fig. 6) is placed out of contact and above the 5 [...] jon 78. This arrangement relative to the plates 16 and 17 (Figure 11) supporting the work perform a slight movement forward clearance that the shoe comes into contact with the stud bolt 78. This qo allow the operator to release the work while the machine is operating. The wide contact of the sinkers and the presser foot with the work does not allow received a rotational movement in the machine. As far [...] day, in the machines of this kind, when it has been necessary to rotate the work, it was necessary to stop the machine, open, and then rotate the work. By decreasing the pressure exerted on the plates as [...] member described, the work remains supported by the folding work and is allowed to rotate thereon, which behaves known a pivot. When the machine is stopped and that the ope- 571,094. Sewing-machines. LEWIS INVISIBLE STITCH MACHINE CO. Nov. 18, 1943, No. 19305. Convention date, July 29. [Class 112] In a blind-stitch sewing-machine the worksupport may be moved away from the presserfoot independently of the work-bender. Additionally, a single manual means may be operated to move the work-support and the workbender away from the presser-foot to provide an opening for the insertion or removal of the work. The invention is applicable to either chain-stitch or look-stitch machines. Worksupporting platens 16, 17, Figs. 4 and 10, are independently and resiliently supported. The platen 17 is supported on a lever 18, pivoted at 19, and held up by a light spring 21. The platens are lowered to the position shown in Fig. 10 by operation of a knee-press which, through levers, causes the rotation of a shaft 26 by rotating a shaft 30 and lowering a link 32. A work-bender 34 is mounted on the end of a shaft 35, journalled in bearings 36, 37 in a cradle 38. The latter is pivotable about pins 39, 40, Fig. 4. The cradle is held in operative position by a heavy spring 43. The workbender is oscillated through rotation of the shaft 35 by means of an eccentric 61, Fig. 7, acting on levers 63, 64 and connecting-rod 68, which is pivoted to one end of a lever 69, The latter is pivoted between its ends on a shaft 70, Fig. 8, that is formed integral with, and eccentric with respect to, a shaft 71. Fig. 8 shows the connection to the bender 34 which is in its upper position. A link 73, connecting the lever 69 and the crank-arm 74, allows the shaft 35 to move substantially vertically, when it is necessary for the work-bender to yield. The depth of penetration of the needle is adjusted by adjustment of the cradle 38, to limit the movement of the cradle under the action of the spring 43. The adjustment is secured by rotation of a knob 60<1> to rotate a screw 60 and move levers 57<1>, 55 and rod 52 to cause an arm 47, supporting the cradle 38, to rotate slightly. Manual retraction of the bender 34 is effected by rotating the shaft 71, and so shifting the pivot 70, by means of a gear 75 meshing with a gear 76 on a shaft 77. This is done, when the machine is stopped, by the operator pressing the knee-press to the fullest extent, a shoe 79, Fig. 11, engaging a stud 78 and rotating the gear 76 to cause the lowering of the pivot pin 70. A finger lever 85, Fig. 5, may be moved to the dotted position shown, causing a circular block 84 to move from one detent notch 86 to another 87, co-operating with a detent 88 on a spring-held disc 81. Rotation of 84 causes the shifting of the pivot 70 for the lever 69, affecting the vertical height reached by the work-bender, and thus the depth of penetration of the needle. [...] bottom pushes the pressure member 27, the shoe 79 comes into contact with the stud 73 and rotates the pinion 76. The pinion 75 and the shaft 71 are thereby given a movement of rotation 5 which causes movement of [...] 70. On Fig. 12, this axis 70 and folding the book 34 are represented in their normal position. When the machine is stopped, the lower end of the lever 69 is maintained -10 bare the connecting rod 63. The movement of the pivot 70 results in motion of the lever about the axis of its pivotal connection with the ' connecting rod 68 by performing removal of the folding work 34 in the position of the fig. 10 i5 and 13. On release of exerting a thrust on the pressure member 27, the plates and the work-carrier for work are brought to their normal positions. This is provided by the springs acting on the plates and so by the spring 80. In the machine represented, the depth of penetration of the needle may be changed to [...] eccentric pivots 70. The shaft 71 passes through the support arm 72 and to said shaft 5 is secured a circular block 84 (fig. 5) from which projects a handle 85 which passes through a slot formed to this effect in the upper wall of the work table. The edge of the block 84 has hollows spaced retaining 3o 86 and 87 which cooperate with a pusher or resilient holding pawl 88 mounted in a sector 89 attached to the shaft 77. By moving the handle 85 of one of its positions to the other determined by the recesses 86 and 87, is 35 70 moves the eccentric pivot of the lever 69. Modified [...] the amplitude of oscillation of the work for folding and, as a result, the penetration of the needle. From the above description of 4 O the disclosed embodiment of the invention shown in the drawings that the invention provides a machine whose opening is easy and a machine which can easily rotate Filling during operation. 45 To maintain the folding in a position suitable for formation of a fold, it requires a spring bias of about 18 kg. In the previous machines, the operator was forced to overcome this force by exerting a 5 O pushed by knee on the pressure member to open the machine. In the present machine, the force that the operator must overcome to open the machine is less than 4.5 kg. By providing means for allowing the plates to move before the 55 for folding movement of the structure under the influence of a thrust exerted by the knee, the operator uses one and the same; operation for rotating the work and to open the machine. 6o In the machines of this kind, the adjustment of the for folding work is very delicate. When the device is carried by a table with mobile work, the machine is to be adjusted frequently, this being dm to 65 machines of this type are opened and closed repeatedly during a day. The closure is effected by an abort [...] complete pressure: controlled by knee, which allows the table to work Of course, the invention is in no way limited to the embodiment described and represented which has been selected that example. SUMMARY.. 8 O A hidden stitch sewing machine, said machine being characterized particularly by the following features considered separately or in combinations: 85 5 e. A device is provided for the controlled i5 of the stitch forming mechanism of the machine, which comprises a bar movably mounted and a needle carried by the., bar; a transmission connects. the device to the control device of the folding work 20 for producing the folding position of the book relative to the needle:r and means are provided for constraining the control device of the folding work to release the work for folding the path of the aia [...] 5; /. The for folding work is of the type with oscillating movement and a manual operating device is provided for rotating this member away from the needle; Said Society: STITCH LEWIS [...] MACHINE [...]. Proxy i For Cabinet [...]. Sale of the fascicles For 1a, address [...] Nationale, 27, the street Convention, Paris (15°).' Ministry of industry and commerce.