JPH0653144U - Reversing gripper device of sheet-fed printing press with reversing mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] In a reversing gripper device of a sheet-fed printing press with a reversing mechanism, when the reverse cylinder transfers the paper from the storage cylinder to the impression cylinder, the position where the paper is sandwiched and the position where the paper is separated are made constant. To improve the registration accuracy and the stability of paper feeding. [Configuration] During double-sided printing, the fixed gripper 12 and the movable gripper 11 rotate clockwise by about 180 ° about the gripper shaft 13 (up to about 200 ° at the maximum for the movable gripper 11) until they face the storage cylinder, and After pinching the rear end, it rotates back to the original position until it faces the impression cylinder. Does not rotate during simplex printing. The cylinder body 35 is provided with the gripper base 10, and the upper surface thereof has substantially the same height as the holding surface of the fixed gripper 12. During single-sided printing, the paper is sandwiched between the upper surface of the gripper table 10 and the movable gripper 11. This is the state for single-sided printing, and the state is for double-sided printing, so remove the paper.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a sheet-fed printing machine with a reversing mechanism, and more specifically, it enables not only single-sided printing but also double-sided printing. Therefore, the front and back sides of the paper conveyed from the storage cylinder are reversed and received on the reverse cylinder side. The present invention relates to improvement of a reversing gripper device of a sheet-fed printing press.

[0002]

[Prior art]

 2. Description of the Related Art In recent years, sheet-fed printing machines with a reversing mechanism capable of both single-sided two-color printing and double-sided printing have become popular. First, the outline of the sheet-fed printing press with the reversing mechanism will be described with reference to FIG. One cylinder side for performing the first printing is composed of a master cylinder 50, a bracket cylinder 51, and an impression cylinder 52. The second cylinder side for performing the second printing is composed of a master cylinder 58, a bracket cylinder 57, and an impression cylinder 56. A printing original plate is mounted on the outer periphery of the master cylinders 50 and 58, and ink is attached by rollers 59 and 60 and the like. In synchronism with the rotation of the master cylinders 50 and 58, the bracket cylinders 52 and 57 rotate and the print content is transferred to the outer periphery thereof. The impression cylinders 52, 56 are rotating with pressure applied to the bracket cylinder side with respect to the paper 61 passing between the cylinders 52, 56 and the bracket cylinders 51, 57. The transfer contents of 57 are printed.

The reversing mechanism portion is composed of a derivation cylinder 53, a storage cylinder 54 having a diameter twice as large as other cylinder diameters, and a reverse cylinder 55. The paper 61 conveyed by the impression cylinder 52 is delivered to the storage cylinder 54 by the de-elivery cylinder 53. Two sheets of paper are mounted on the outer periphery of the storage cylinder 54 in semi-circle units, and are sequentially delivered to the reverse cylinder 55. The second cylinder is further conveyed from the reverse cylinder 55 to the second drum side, and the second printing is performed. In the case of single-sided two-color printing, the front end of the paper conveyed on the outer periphery of the storage cylinder 54 is sandwiched by the gripper part (not shown) of the cylinder 55 at a position facing the reverse cylinder 55, and the reverse cylinder is drawn along the path shown by the dotted line. Handed over to 55. When performing double-sided printing, when the front end of the paper conveyed on the outer periphery of the storage cylinder 54 passes a position where it faces the reverse cylinder 55 and the rear end of the paper reaches a predetermined position, the gripper part of the cylinder 55 concerned. And is delivered to the reverse cylinder 55 through the path indicated by the chain double-dashed line. The paper that has completed the second printing on the side of the second drum is conveyed by the chain delivery unit 62 and discharged.

[0004]

[Problems to be solved by the device]

 In the above-mentioned sheet-fed printing press, when performing double-sided printing, it is necessary to change the direction of the gripper provided on the outer peripheral portion of the reverse cylinder, since the gripper conveys the rear end of the paper. Conventional inversion gripper devices are classified into a single gripper type and a double gripper type. Among them, the single gripper method is configured to be turned upside down in a pair because the single gripper method rotates about 180 ° between gripping and separating the rear end of the paper. An example thereof is described in JP-A-62-169645. According to this conventional gripper device, the gripper portion is not inverted during single-sided printing and is in a fixed state, and only one gripper (upper gripper) opens and closes slightly to grip the paper. However, in double-sided printing, both grippers are turned upside down, so that the pair of top and bottom grippers rotate about a certain point. Since the other gripper (lower gripper) is fixed to the rotating shaft that serves as a fulcrum, the rotating shaft does not rotate during single-sided printing, but it is in a fixed state. It moves slightly.

Therefore, since the leading edge or the trailing edge of the paper conveyed from the storage cylinder is grasped at a slightly different position for each paper and the position where the paper is released is not stable, the printing position is misaligned and the registration accuracy is difficult to be obtained. was there. Particularly, in single-sided printing, the first printing is performed, and the second printing is performed on top of it, so even a slight misalignment of paper reduces the print quality. Double-sided printing is also less affected than single-sided printing, but it is desirable that both sides be printed with high accuracy. Further, there is a drawback in that the conveyance operation becomes unstable due to the nonuniform holding and releasing of the paper. The object of the present invention is to solve the above-mentioned drawbacks.When the paper is transferred from the storage cylinder to the impression cylinder, the registering position and the paper separating position are made constant to improve the registration accuracy and the paper conveyance stability. An object of the present invention is to provide a reversing gripper device for a sheet-fed printing press with a reversing mechanism as illustrated.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the reversing gripper device of the sheet-fed printing press with reversing mechanism according to the present invention is provided with a reversing gripper part consisting of a fixed gripper and a movable gripper on the outer periphery of the reverse cylinder. When the double-sided printing is performed, the tip of the paper transported by the storage cylinder is nipped and received with the nipping opening of the reversing gripper part facing in the direction opposite to the rotation direction of the reverse cylinder. In the reversing gripper device of the sheet-fed printing press with a reversing mechanism, the rear end of the paper conveyed by the storage cylinder is caught with the mouth turned in the direction of rotation of the reverse cylinder, the paper is flipped over, and is delivered to the next imprint cylinder. , Mesh so that part of the gripping surface of the movable gripper protrudes from the gripping surface of the fixed gripper. At the same time, the gripper base is fixed to the reverse cylinder so that the upper surface thereof is approximately the same height as the holding surface of the fixed gripper during the single-sided printing, and when the paper is received from the storage cylinder, the single-sided printing is performed. The leading edge of the paper is clamped by the upper surface of the gripper base and the protruding gripping surface of the movable gripper, and when the paper is transferred to the impression cylinder, the paper is clamped by the gripper base during both single-sided printing and double-sided printing. The upper surface and the protruding gripping surface of the movable gripper are configured to be separated while being sandwiched.

[0007]

[Action]

 According to the above configuration, the leading edge of the paper is pinched between the movable gripper and the fixed gripper base during single-sided printing, and the paper is released from that state, and between the movable gripper and the gripper base during double-sided printing. Since it is released after being sandwiched, the registration accuracy of the printing position is improved. Also, the paper feeding is stable.

[0008]

【Example】

 Hereinafter, the present invention will be described in more detail with reference to the drawings. 1 and 2 are views for explaining the movement of the reversing gripper portion of the reversing gripper device of the printing machine according to the present invention. FIG. 1 shows a case of single-sided printing, and FIG. 2 shows a case of double-sided printing. Shows. When printing on one side, the reversing gripper part 4 provided on the outer periphery of the reverse cylinder (reversing cylinder) 1 does not reverse, and the nipping opening of the reversing gripper part 4 faces in the direction opposite to the rotating direction of the reverse cylinder 1 and opens slightly. Move from A1 to A2 in the closed state. Then, when the paper is moved to a position facing the storage cylinder (double diameter cylinder) 2 of A3, the front end of the conveyed paper is grasped by the front end gripper 6 and the front end of the conveyed paper is received. And move. When the delivery of the paper is completed, the front gripper 6 and the rear gripper 7 of the storage cylinder 2 are opened. When the paper moves to the position of A1 facing the impression cylinder (impression cylinder), the leading edge of the paper is gripped by the impression cylinder gripper 5 of the impression cylinder (impression cylinder) 3 and the reversing gripper portion 4 slightly opens to release the paper. The respective cylinders are synchronously rotated in such a positional relationship that the front end of the paper can be delivered from the gripper 6 of the storage cylinder 2 to the reverse gripper portion 4 of the reverse cylinder 1.

In FIG. 2, when performing double-sided printing, the reversing gripper unit 4 rotates about + 180 ° before reaching A1 to A3, and the rotation direction of the reverse cylinder 1 is the same as the nipping opening of the reversing gripper unit 4. Turn to face. Then, at the position of A3, the rear end of the paper conveyed by the storage cylinder 2 is gripped, and this time, the rotation starts in the opposite direction. The reversal of about -180 ° is completed by the time it passes through A4 and A5 and reaches the position A1 facing the impression cylinder 3, and the rotation direction of the reverse cylinder 1 and the sandwiching hole of the reversal gripper portion 4 are opposite to each other. When the transfer to the impression cylinder gripper 5 of the impression cylinder 3 is completed, the rotation starts again. In this case, the respective cylinders are rotated in such a positional relationship that the rear end of the paper held by the rear end gripper 7 of the storage cylinder 2 can be delivered to the reverse gripper portion 4 of the reverse cylinder 1. That is, the reverse gripper portion 4 of the reverse cylinder 1 is in a phase relationship delayed by the length dimension of the paper as compared with the case of single-sided printing.

FIG. 3 is a diagram for explaining the details of the reversing gripper portion of the embodiment of the present invention. (A) shows an assembled state, (b) shows a movable gripper, (c) shows a fixed gripper, (D) shows the states as viewed from the arrow 24 with the cylinder body omitted. Eight reverse gripper parts 4 are arranged in parallel at the outer peripheral position of the reverse cylinder 1 (see FIG. 4). The movable gripper 11 and the fixed gripper 12 are inserted and incorporated in the gripper shaft 13 with their holes 11a and 12a aligned. The fixed gripper 12 is fixed to the gripper shaft 13 by screws 36. A stay 30 accommodating the coil spring 45 is provided in the cut groove 11c at the rear of the movable gripper 11, and the stay 30 is attached to the upper part of the cut groove 11c by a screw 37. A stopper screw 46 for adjusting the distance to the stay 30 is provided below the cut groove 11c.

The fixed gripper 12 can be rotated clockwise by about 180 ° by the rotation of the gripper shaft 13, and then can be reversed to return to the state of FIG. 3A. The stay 30 can also rotate clockwise up to about 200 ° with the gripper shaft 13 as a fulcrum, and then reverse and return to the state of FIG. 3 (a). The leading edge or the trailing edge of the paper is sandwiched between the sandwiching surface 12b of the fixed gripper 12 and the sandwiching surface 11b of the movable gripper 11. The movable gripper 11 is designed to be opened about 10 ° to 20 ° more than the fixed gripper 12 in a state where the nipping opening of the reversing gripper portion 4 is opened. By adjusting the screw 37, the repulsive force of the coil spring 45 can be changed and the gripping force of the reversing gripper can be changed. Further, the distance between the fixed gripper 12 and the gripping surface of the movable gripper 11 can be adjusted by adjusting the stopper screw 46.

A gripper base 10 having a cut groove 10 b and an upper surface 10 c of which abuts against a holding surface 11 b of the movable gripper 11 is fixed to the cylinder body 35 by a screw 10 a. The gripper base 10 has a horizontally long shape, and four gripper bases are connected to each other (see FIG. 4). In the state shown in FIG. 3A, that is, in the state in which the gripper is not rotating, the holding surface 12b of the fixed gripper 12 and the upper surface 10c of the gripper base 10 are at substantially the same height. Therefore, the central portion of the holding surface 11b of the movable gripper 11 abuts the holding surface 12b of the fixed gripper 12 and both ends abut the upper surface 10c of the gripper base 10. When the front end of the paper 61 is sandwiched in single-sided printing, the paper 61 is sandwiched between the upper surface 10c of the fixed gripper base 10 and the sandwiching surface 11b of the movable gripper 11, and the position of the sandwiched front end of the paper is always constant. Therefore, the position where the paper is released is also constant. During double-sided printing, the fixed gripper 12 rotates about 180 ° and the movable gripper 11 rotates about 200 ° clockwise so that the rear end of the paper is sandwiched between the holding surface 12b of the fixed gripper 12 and the holding surface 11b of the movable gripper 11. In response to this, the movable gripper 11 is inverted by -20 ° (rotated by about 180 °) so that the end of the paper can be pinched.

Next, the drive mechanism of the reversing gripper device will be described with reference to FIGS. 4 to 8. FIG. 4 is a front view showing a reverse cylinder of a sheet-fed printing press according to the present invention with a necessary part partially shown in section. For ease of explanation, the part on which the reversing gripper part is mounted is shown in an expanded state in the upward direction. Reference numeral 39 denotes a part of the storage cylinder side, and the reverse cylinder rotates in the direction shown by the arrow. A cylinder shaft 19 integral with the cylinder body is rotatably attached to the left and right fixing plates 38, and the rotation is transmitted in the direction of the arrow from a drive mechanism unit (not shown). The left fixing plate 38 has a movable gripper cam 25 for single-sided printing and a movable gripper cam 26 for double-sided printing centered on the cylinder shaft 19, and the right fixing plate 38 similarly has a fixed gripper cam 27 for single-sided printing. And a fixed gripper cam 28 for double-sided printing. The shapes of these cams are shown in FIGS. 9 (a) and 10 (a) and 9 (b) and 10 (b), respectively.

The cam followers 20 and 21 can be repositioned in a direction parallel to the cylinder shaft 19 so as to be engaged with one of the movable gripper cams 25 and 26 and the fixed gripper cams 27 and 28. Printing can be switched. FIG. 4 shows a state in which double-sided printing is set. The drive system of the fixed gripper 12 will be described. The gripper shaft 13 fixing the eight fixed grippers 12 is rotatably supported by the three bearings 31. A gear 32 is fixed to the right end of the gripper shaft 13, a gear 33 is engaged with the gear 32, and the gear 33 is screwed to a gear arm 34. The gear arm 34 is swingable around a fulcrum portion 41.

FIG. 5 shows a right side view of the CC position of FIG. The gear arm 34 has an escape hole 34a for the cylinder shaft 19 in the center. One end of a coil spring 40, the other end of which is fixed to a cylinder, is engaged with the right position of the fulcrum portion 41, and a biasing force is applied counterclockwise about the fulcrum portion 41. Further, the cam follower 21 is attached to the left position of the fulcrum portion 41 of the gear arm 34. During double-sided printing, as the cylinder rotates, the cam follower 21 is pushed up by the fixed gripper cam 28 in the direction of arrow 21a, and the gear 33 moves to the right around the fulcrum 41 as a fulcrum, and the fixed gripper 12 moves about + 180 ° ( Rotate counterclockwise about the gripper shaft in the figure). Since the fixed gripper cam 27 has a circular shape during single-sided printing, the cam follower 21 does not move in the direction of the arrow 21a, holds the position shown in FIG. 5, and the fixed gripper 12 does not rotate.

Next, the drive system of the movable gripper 11 will be described. Both ends of each of the two stays 30 that fix four movable grippers 11 are fixed to a gear 15 that is rotatably mounted around a gripper shaft 13. The gear 15 is engaged with the gear 16, and the other end of the gear 16 is fixed to the gear arm 17. The other end of the gear arm 17 is fixed to the drive shaft 18. FIG. 6 shows a right side view of the position D-D in FIG. The gear arm 17 has an escape hole 17a for the cylinder shaft 19 in the center. During double-sided printing, the drive shaft 18 rotates in the direction of arrow 18a as the cylinder rotates, and the gear 16 also moves to the right accordingly, and the movable gripper 11 moves about + 200 ° (counterclockwise around the gripper shaft in the figure). Rotate up to. During single-sided printing, the drive shaft 18 slightly rotates in the direction of arrow 18a, and the movable gripper 11 rotates about + 10 ° (counterclockwise around the gripper shaft in the figure).

FIG. 7 is a view of the EE position in FIG. 4 viewed from the left side. The configuration in the vicinity of the reversing gripper unit 4 is as shown in FIG. A drive shaft 18 rotatably extends through the cylinder. FIG. 8 is a view of the F-F position in FIG. 4 seen from the left side, and is a view for explaining the operation of the cam follower lever 22. The other end of the drive shaft 18 is fixed to the center of the cam follower lever 22. The left end of the cam follower lever 22 is engaged with one end of a coil spring 42, the other end of which is fixed to the cylinder, and a biasing force is applied clockwise about the drive shaft 18. During double-sided printing, the cam follower 20 is pushed up by the movable gripper cam 26 in the direction of the arrow 20a with the rotation of the cylinder, thereby transmitting the rotational force to the drive shaft 18.

FIG. 9 is a diagram showing the shape of a cam for single-sided printing, and is a diagram for explaining the rotation timings of the fixed gripper and the movable gripper in relation to the shape of the cam. As shown in FIG. 3B, since the cam follower 21 cannot be pushed up by the circular fixed gripper cam 27, the fixed gripper 12 does not move in the state of FIG. 3A. The rotation angle of the gripper is 0 ° when the direction of rotation of the cylinder is opposite to the direction of the sandwiching hole, and the position indicated by the chain double-dashed line is the position facing the impression cylinder 3 and the storage cylinder 2. The movable gripper 11 starts rotating when it faces the impression cylinder 3, and when the cylinder rotates about 10 °, it rotates about + 10 ° and ends. At this point, the movable gripper 11 is opened with respect to the fixed gripper, that is, the gripper base 10. In this state, when the cylinder further rotates and reaches about 10 ° before facing the storage cylinder 2, the movable gripper 11 rotates in the closing direction, that is, when the movable gripper 11 faces the storage cylinder 2, the movable gripper 11 completely pinches the tip of the closed paper. . Then, the paper is then conveyed to a position facing the impression cylinder 3, and the movable gripper 11 starts to open again at that position. The sandwiching is performed between the gripper base 10 and the movable gripper 11.

FIG. 10 is a diagram showing the shape of a cam for double-sided printing, and like the above, is a diagram for explaining the rotation timings of the fixed gripper and the movable gripper in relation to the shape of the cam. The movable gripper cam 26 has a radius R at a position facing the impression cylinder 3 and a position 10 ° before the facing position, and 2R at a position facing the storage cylinder 2 and a position 10 ° ahead of the facing position. In addition, the radius is slightly larger than 2R 10 ° before the position facing the storage cylinder 2. On the other hand, the fixed gripper cam 28 has a radius R at a position facing the impression cylinder 3 and a position 10 ° before the position facing the impression cylinder 3, and has a radius R at a position facing the storage cylinder 2 and positions 10 ° before and after the position. There is.

Therefore, the fixed gripper 12 rotates to about + 180 ° at a position 10 ° before facing the storage cylinder 2 after facing the impression cylinder 3, and stops rotating about 10 ° ahead of the position at which the storage cylinder 2 faces about +180. Maintain °. By the time it faces the impression cylinder 3, it reverses about -180 ° and returns to the original non-rotating state. The movable gripper 11 rotates up to 200 ° at a position 10 ° before the position facing the storage cylinder 2 after facing the impression cylinder 3, and rotates -20 ° in the opposite direction before facing the storage cylinder 2. It becomes + 180 °. By the time it faces the impression cylinder 3, it reverses about -180 ° and returns to the original non-rotating state. Therefore, the reversing gripper unit 4 starts to clamp the rear end of the paper in the vicinity of 10 ° before facing the storage cylinder 2 in the rotating state, and ends the clamping at the facing position. Then, thereafter, the nipping opening is gradually rotated in the direction opposite to the rotation direction of the cylinder, and the gripper of the impression cylinder 3 is delivered at a position facing the impression cylinder 3.

[0021]

[Effect of device]

 As described above, according to the present invention, during single-sided printing, the leading edge of the conveyed paper is pinched between the holding surface of the movable gripper and the upper surface of the gripper base fixed to the cylinder body, and the single-sided printing and double-sided printing are performed. At the time of printing, the end of the paper is released while being held between the holding surface of the movable gripper and the upper surface of the gripper base. Therefore, especially in single-sided printing, the position where the paper is pinched and released becomes constant, and the registration accuracy is improved. Also in double-sided printing, after the paper is pinched, the reversing gripper section is flipped back to its original rotation angle position, and after the state of being pinched between the gripping surface of the movable gripper and the upper surface of the gripper base, the leading edge of the paper is Since they are separated from each other, the register accuracy is also improved. Furthermore, since the paper passing operation becomes constant, the stability of paper feeding is improved.

[Brief description of drawings]

FIG. 1 is a diagram for explaining the movement of a reversing gripper unit of a reversing gripper device of a sheet-fed printing press with a reversing mechanism according to the present invention, which is a case of single-sided printing.

FIG. 2 is a view for explaining the movement of the reversing gripper unit of the reversing gripper device of the sheet-fed printing press with a reversing mechanism according to the present invention, which is the case of double-sided printing.

3A and 3B are views for explaining details of an inverted gripper portion of an embodiment of the present invention, in which FIG. 3A is an assembled state, FIG. 3B is a movable gripper, FIG. 3C is a fixed gripper, and FIG. Shows the states as viewed from the arrow 24 with the cylinder body omitted.

FIG. 4 is a front view showing a reverse cylinder of a sheet-fed printing press according to the present invention with only a necessary portion partially shown in section.

5 is a right side view of the position C-C in FIG. 4, showing the gear arm 3;
4 is a diagram for explaining the operation of FIG.

6 is a right side view of the D-D position in FIG. 4, showing the gear arm 1;
It is a figure for demonstrating operation | movement of 7.

FIG. 7 is a left side view of the position EE in FIG.

8 is a left side view of the FF position in FIG. 4 and is a view for explaining the operation of the cam follower lever 22. FIG.

FIG. 9 is a diagram showing a shape of a cam for single-sided printing, and is a diagram for explaining rotation timings of a fixed gripper and a movable gripper in relation to the shape of the cam.

FIG. 10 is a diagram showing a shape of a cam compatible with double-sided printing, and is a diagram for explaining rotation timings of a fixed gripper and a movable gripper in relation to the shape of the cam.

FIG. 11 is a schematic diagram showing a configuration of a sheet-fed printing press with a reversing function capable of single-sided printing and double-sided printing.

[Explanation of symbols]

 1 Reverse Cylinder (RC) 2 Storage Cylinder (SC) 3 Impression Cylinder (IC) 4 Inverting Gripper Part 5 Impressor Gripper 6,8 Tip Gripper 7,9 Rear Gripper 10 Gripper Stand 11 Movable Gripper 12 Fixed Gripper 13 Gripper Shaft 15 , 16, 32, 33 Gear 17, 34 Gear arm 18 Drive shaft 19 Cylinder shaft 20, 21 Cam follower 22 Cam follower lever 24 Arrows 25, 26 Movable gripper cam 27, 28 Fixed gripper cam 30 Stay 31 Bearing 34a Clearance hole 35 Cylinder body 36, 37 screw 38 fixing plate 39 part of storage cylinder side 40, 45 coil spring 41 fulcrum part 46 stopper screw

Claims (1)

[Scope of utility model registration request] 1. A reverse cylinder is provided with a reversing gripper portion composed of a fixed gripper and a movable gripper on an outer peripheral portion of the reverse cylinder, and a pinch of the reversing gripper portion is directed in a direction opposite to a rotation direction of the reverse cylinder during one-sided printing. In this state, the front end of the paper conveyed by the storage cylinder is pinched and received, and during double-sided printing, the paper conveyed by the storage cylinder is conveyed with the nipping opening of the reversing gripper section facing in the direction of rotation of the reverse cylinder. In a reversing gripper device of a sheet-fed printing press with a reversing mechanism, which sandwiches an end, receives the paper by turning it over, and delivers it to the next impression cylinder. At the same time, the upper surface of the reverse cylinder is fixed to the fixed cylinder during the single-sided printing. The gripper base is fixed so as to be approximately the same height as the gripping surface of the lid, and when the paper is received from the storage cylinder, the gripping of the leading edge of the paper during single-sided printing is performed on the upper surface of the gripper base and the movable gripper. With the protruding surface of the gripper, and when delivering the paper to the impression cylinder, separate the paper while sandwiching it between the upper surface of the gripper table and the protruding surface of the movable gripper during both single-sided and double-sided printing. A reversing gripper device of a sheet-fed printing press with a reversing mechanism, which is configured as described above.