DEVICE FOR the ASSEMBLY AND the DISASSEMBLING OF the COATINGS Of UNCONTRE-CYLINDRE OF ROTARY CUTTING

The present invention relates to a device for mounting and removal of the without rotary die cylinder.

The rotary cutting cardboard or corrugated cardboard is an operation well-known practice which involves inter alia, a holder cylinder generally comprises a metallic cylinder body attached thereto shells, preferably made of wood, in which are inserted metallic threads and cutting a counter-die cylinder commonly called anvil. The counter-cylinder comprises a metallic cylinder body on which are reported cover strips generally made of a plastic material such as polyurethane for example.

II is to be noted that the tools can be fitted with various shells having cutting thread configurations dictated as a function of the shapes and dimensions of the boxes which are to be cut. The material to be cut, in this case, corrugated board passes between the tools and the anvil cutting and, in the dicing step, the metal nets cylinder tools penetrate more or less deeply into the coating strips, which causes a number of hours after cutting wear of some of these cover strips.

These coating bands are generally mounted side-by-side across the width of the cylinder body of the counter-cylinder. The cylinder body has a groove extending over its entire width. The strip attachment coating is constructed by embedding mallet at the ends of the cover strips in the groove in the counter-roller. Each end of the coating strips may be reinforced by a metal reinforcement and has, for one, a centring nose and for the other a notch in which the lug engages centering. Due to the attachment, the mounting thus produced is substantially permanent and requires a removing force.

Deterioration of the surface of the strips of coating is not uniformly across the width of the anvil and it is clear that when the deterioration disturbs the operation for cutting or grooving of the carton it reset a state of acceptable surface of the coating of the counter-cylinder.

Generally the recovery of this surface is performed by rectifying the outer diameter of the coating of the anvil by grinding or any other similar machining. Due to the high production speed rotary cutting machines, this must be repeated frequently and, in addition to causing a decrease the productivity of the machine, it drives a high consumption of coating strips.

To eliminate the aforementioned difficulties by providing users to counter cylinder whose design allows maximum spacing at the grinding operations, even eliminated.

To this end, the present invention relates to a device for the rapid assembly and disassembly of the coating strips of a counter-rotary die cylinder characterized in that it comprises means to clamp and unclamp the ends of at least one cover strip to permit the permutation in the width of the anvil before the occurrence of severe wear.

According to one embodiment of the invention, the means to clamp and unclamp the ends of a cover strip are constituted by a locking and unlocking means housed in a groove arranged at the periphery of the cylinder body of the counter-rotary die cylinder, said groove extending over the entire width of the cylinder body.

In one preferred embodiment of the invention, the locking and unlocking means comprises a displaceable slide moving in the groove extending in the width direction of the cylinder body, said displaceable slide has guide grooves and shaped grooves linear cam in which are inserted the rollers fastened to at least one moveable jaw to act on at least one of the ends of the cover strips.

In another preferred embodiment of the invention, the displaceable slide is actuated by means of a pulling device comprising a displacement screw engaging a nut attached to the bottom of said movable slide.

In another embodiment of the invention, the traction device comprises a movable cylinder for actuating the slide.

According to one embodiment of the invention, the pulling device is arranged in a groove at one end of the cylinder body.

The annexed drawings illustrate, schematically and as an example, one embodiment of the device for mounting and removal of the coating strips of a counter-rotary die cylinder object of the present invention.

Figure 1 is a schematic view of a counter-rotary die cylinder,

Figure 2 is a plan view of a slider which is movable,

Figure 3 is a partial cross-sectional view according to III-III of Figure 1 representing a mechanism for blocking and unblocking a single jaw in clamping position cover strips,

Figure 4 is a partial cross-sectional view according to III-III of Figure 1 representing a mechanism for blocking and release two jaws in clamping position cover strips,

Figure 5 is a partial cross-sectional view according to III-III of Figure 1 representing the release and locking feature with two jaws in the position of release cover strips,

Figure 6 is a perspective view of a traction device, Figure 7 is a view according to A of Figure 5, and

Figures 8a to 8d represent schematically the sequences of permutation of the coating strips.

Figure 1 is a schematic view of a counter-rotary die cylinder 1 comprising a cylinder body 2 on which are wound cover strips 3 retained at each of the ends of the cylinder body 2 by means of stop discs 4. The cylinder body 2 has a groove 5 extending over its entire width. The ends 6, 7 cover strips 3 engage a means for clamping and release consisting of a locking and unlocking 8 (see Figures 3, 4 and 5) arranged in the groove 5.

Figure 2 is a plan view of a displaceable slide 9 used in the release and locking feature 8. The displaceable slide 9 includes guide grooves 10 and shaped grooves linear cam 11 in which are inserted the rollers 12, 13 and 14 (see Figures 3 to 6 ).

Figure 3 is a partial cross-sectional view according to III-III of Figure 1 representing a release and locking feature 15a, to a single jaw 16, in the clamping position cover strips 3. The release and locking feature 15a comprises a displaceable slide 9a which has grooves linear cam 11a which are engaged by the rollers 14a. The rollers 14a are mounted on an axis 17 joined to the jaw 16. The jaw 16 is provided with guide rods 18 slidable in a strip 19 fixed in the groove 5a by means of the screws 20. The end 6a of the liner web 3 hooks onto the nose 16a of the jaw 16. The other end 7a of the liner web 3 is hooked in turn over the nose 25a of a fixed bar 25 held in the groove 5a by means of the screws 26. The ends of the strips of manufacturing can be enhanced at the ends by stringers 23 and 24. The displaceable slide 9a comprises, at one of its ends a traction device which consists of a nut 27 through which a displacement screw 28. The nut 27 is attached to the bottom the displaceable slide 5a by means of the screws 29.

Therefore, upon actuation, in a direction, of the displacement screw 28 the displaceable slide 5a, the jaw 16 will move in the direction of the arrow 30 to perform loosening of the end 6a of the liner web 3. Such movement of the jaw 16 is obtained through the action of the cam grooves 11a linear, provided in the displaceable slide 5a, on the rollers 14a, integral with the jaw 16. The movement of the shoe 16 will be so selected that the end 6a of the liner web 3 can be released from the nose 16a so that the dismounting the shroud are connected easily and without deteriorating. Turning the displacement screw 28 in the reverse direction, after coating replaced or a band 3 to be permuted, or a new cover strip 3, the jaw will move in the opposite direction to the arrow 30 which create the tightening of the end 6a of the liner web 3 against its end 7a.

It is to be understood that in this version, the displaceable slide 5a has grooves cam 11a on a single linear part of its surface, due to the fact of the existence of a single jaw 16. There may be a number of devices for locking and unlocking 15a in the width, independent of the number of coating strips 3 distributed over the width of the cylinder body 2.

Figure 4 is a partial cross-sectional view according to III-III of Figure 1 representing a release and locking feature 8 with two jaws in the clamping position cover strips 3. The release and locking feature 8 comprises a displaceable slide 9 has linear cam shaped grooves 11a in which are inserted the rollers 13 and 14 (see also Figure 2). The rollers 13 are mounted on a shaft 31 driven into the jaw 32. The jaw 32 has a profile tooth-like 33 cooperates with a conjugate profile 34 arranged in the fixed bar 35 fixed in the groove 5 of the cylinder body 2 by means of the screws 36. The function filled by the profiles 33, 34 always includes supporting the cover strip 3 in the case where a net cutter would be opposite the portion of circumference corresponding to the area between the rear of the jaw 32 and the front of the fixed bar 35. It is evident that if the straight is chose a rear portion of the jaw 32 and a front portion of the fixed rectilinear bar 35, cause clamping it at a slot perpendicular to which the cover strip 3 is not supported. The end 6 of the liner web 3 may be reinforced by a stiffener (not shown) and hooks over the nose 32a of the jaw 32. The other end 7 of the liner web 3, which can be also reinforced by a stiffener (not shown), is hooked in turn over the nose 37a of a second jaw 37. The jaw 37 comprises, also, a tooth-like profile 38 acting together with a profile in the form of a conjugate toothing 39 arranged in the fixed bar 40 fixed in the groove 5 of the cylinder body 2 by means of the screws 41. The teeth 38 and 39 perform the same function that the sets of teeth 33 and 34 previously mentioned. The rollers 14, associated with the jaw 37, engage with the grooves to form linear cam 11 and are mounted on a shaft 42 secured in the jaw 37.

The displaceable slide 9 comprises, at one of its ends a traction device 44 which will be described in more detail using the Figures 6 and 7. Upon actuation, of the traction device 44, the jaw 32 will move in the direction of the arrow 43 to effect clamping of the end 6 of the liner web 3. Such movement of the jaw 32 is obtained through the action of the linear cam shaped grooves 11a, provided in the displaceable slide 5, on the rollers 13, integral with the jaw 32. Movement the displaceable slide 9 will also simultaneously moves the jaw 37, but in the direction indicated by the arrow 45, by the action of the shaped grooves 11 linear cam on the rollers 14. The jaws 32 and 37, and the displaceable slide 9 are guided by means of rollers 12 engaging in guide grooves 10. The rollers 12 are attached, rotatably, on the cylinder body 2 by means of the screws 46.

This solution using two jaws 32 and 37 can be detached and a clamping the ends 6 and 7 cover strips 3 by decreasing the amount of movement of the displaceable slide 9 and jaws 32 and 37. There may be a number of devices for locking and unlocking 8 in the width, independent of the number of coating strips 3 distributed over the width of the cylinder body 2.

Figure 5 is a partial cross-sectional view according to III-III of Figure 1 representing the release and locking feature 8 with two jaws in the position of release cover strips, In that figure, the reference signs are the same as used in connection with the description of Figure 4. However, in the figure, the actuation, in the opposite direction, of the traction device 44 will cause the movement of the shoe 32 in the direction of the arrow 47 to effect loosening of the end 6 of the liner web 3. Movement the displaceable slide 9 will also simultaneously moves the jaw 37 to effect loosening of the end 7 of the liner web 3, but in the direction indicated by the arrow 48, by the action of the shaped grooves 11 linear cam on the rollers 14. The movement of the jaws 32 and 37 will be selected so that the ends 6 and 7 of the liner web 3 can be disengaged from the nose 32a and 37a so that the dismounting the cover strip 3 easily done and without deterioration.

This solution using two jaws 32 and 37 enables clamping and loosening the ends 6 and 7 cover strips 3 by decreasing the amount of movement of the displaceable slide 9 and jaws 32 and 37. There may be a number of devices for locking and unlocking 8 in the width, independent of the number of coating strips 3 distributed over the width of the cylinder body 2.

Figure 6 is a view-away, partial cross-sectional, of a pulling device 44 arranged at one of the ends of the counter-rotary die cylinder 1. The pulling device 44 has a displacement screw 49 guided in a bearing plate 50 fixed in a housing 51 of the counter-rotary die cylinder 1 by means of the screws 52 and 53. The displacement screw 49 is positioned relative to the bearing plate 50 by means of a retaining ring 54. The displacement screw 49 engages in a nut 55 attached to the bottom the displaceable slide 9 by screws 56 and 57. Therefore, upon actuation in rotation, in one direction or the other, of the displacement screw 49 will result in the tightening or loosening of the ends 6, 7 cover strips 3. It is clear that the pulling device 44 could be advantageously replaced by any other member capable of generating the movement of the displaceable slide 9, e.g. a pneumatic cylinder.

Figure 7 is a view of Figure 4 according to A represented without coating strips 3. In that figure, the designation of the various components resumes the same reference numbers as those used in connection with the description of Figures 4.5 and 6.

Figures 8a to 8d represent schematically the sequences of permutation of the coating strips 3. In the representation of Figure 8a, the jaws 32 and 37 are in released position (see Figure 5). Can then be removed the cover strip 3 as shown in arrow 58. The coating strips 3a to 3c are also in a situation released enabling them to be removed in the direction of the arrows 59 (see Figure 8b). Once the movement of the coating strips 3a to 3c performed, the cover strip 3 can be replaced, as indicated by the arrow 60, it to the position that was previously the cover strip 3c (see Figure 8c). The coating strips 3 to 3c having been swapped out, is will act on the movement device 44 and the jaws 32 and 37 will be in clamping position as shown in Figure 4. It is clarified that using the solution given by the above description a range large permutation is offered to the user which can choose to switch any cover strip 3 to 3c according to their deterioration without damaging the coating strips to 3c 3. The shape identical symmetrical ends of the strips 3 provides rotation thereon, the front edge then becoming the trailing edge, to better distribute wear.