Gripping-side plate vise device for sheet-fed printing press

Abstract

To provide a gripping-side plate vise device for a sheet-fed printing press that facilitates repair when the flatness of a clamping surface of a lower tooth deteriorates.SOLUTION: There is provided a gripping-side plate vise device 30 for a sheet-fed printing press that is disposed within a notch 11 of a plate cylinder 10 and clamps a gripping side end part of a plate 1 wound around an outer peripheral surface of the plate cylinder 10 between a lower tooth 31 and a movable upper tooth 41. The gripping-side plate vise device 30 includes: a plurality of pieces of fixing means 24 which are arranged at intervals in the axial direction of the plate cylinder 10 to fix the lower tooth 31 to a bottom surface 15 of the notch 11; a female screw hole 52 which is arranged between the adjacent pieces of fixing means 24 and formed to penetrate the lower tooth 31 in the vertical direction; and a pressing screw 51 which is screwed into the female screw hole 52 and can press the bottom surface 15 of the notch 11 by the operation from the upper surface 35 side of the lower tooth 31 where a clamping surface 33 is formed.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a gripper side plate clamping device for a sheet-fed printing press.

Background Art

[0002] A sheet-fed printing press includes a plate cylinder on which a plate is mounted. A groove-shaped notch extending in the axial direction is formed in a part of the outer peripheral portion of the plate cylinder. A plate clamping device for mounting the plate is disposed in the notch. The plate clamping device includes lower teeth and movable upper teeth, and clamps the circumferential end portion of the plate wound around the outer peripheral surface of the plate cylinder between the lower teeth and the upper teeth. The plate clamping device includes a gripper side plate clamping device that clamps the gripper side end portion of the plate in the circumferential direction of the plate, and a gripper tail side plate clamping device that clamps the gripper tail side end portion (see Patent Document 1 below).

[0003] The lower teeth of the gripper side plate clamping device have a clamping surface for clamping the gripper side end portion of the plate between the lower teeth and the upper teeth. The clamping surface is formed to extend in the axial direction of the plate cylinder. The clamping surface is configured as a plane parallel to the axis of the plate cylinder. Alternatively, the clamping surface is configured such that a plurality of locations for clamping the plate are located within a common plane parallel to the axis of the plate cylinder. The clamping surface is manufactured with high flatness so that the clamped plate does not deform.

[0004] Further, the gripper side plate clamping device is installed in the notch with the lower teeth fixed to the inner surface of the notch.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, the lower teeth of the gripper side plate chucking device may be deformed due to secular changes caused by internal stress, collisions with foreign objects, etc. In this case, the flatness of the clamping surface decreases. When the flatness of the clamping surface decreases, the amount of deformation of the clamped plate increases and the color registration becomes inaccurate. Therefore, repair is required. In the repair, the gripper side plate chucking device is removed from the notch in the plate cylinder and taken out of the printing machine, the lower teeth are corrected or replaced, and then it is reinstalled in the notch of the plate cylinder, which is a very laborious and time-consuming operation.

[0007] The present invention has been made to solve the above-described problems, and an object thereof is to provide a gripper side plate chucking device for a sheet-fed printing machine that is easy to repair when the flatness of the clamping surface of the lower teeth decreases.

Means for Solving the Problems

[0008] The gripper side plate chucking device for a sheet-fed printing machine according to the present invention is arranged in a notch of a plate cylinder, and is configured to clamp the gripper side end portion of a plate wound around the outer peripheral surface of the plate cylinder with a lower tooth and a movable upper tooth, and is arranged at intervals in the axial direction of the plate cylinder, and includes a plurality of fixing means for fixing the lower tooth to the bottom surface of the notch, a menji hole formed by penetrating the lower tooth in the vertical direction and arranged between adjacent fixing means, and a pressing screw that is screwed into the menji hole and can press the bottom surface of the notch by an operation from the upper surface side of the lower tooth where the clamping surface is formed.

[0009] In the gripper side plate chucking device for a sheet-fed printing machine according to the present invention, a menji hole that is formed by penetrating the lower tooth in the vertical direction and is arranged outside the fixing means at both ends in the axial direction of the plate cylinder can be further provided.

[0010] Also, in the gripper side plate chucking device for a sheet-fed printing machine according to the present invention, the menji hole can be arranged at the axial center between adjacent fixing means.

Effects of the Invention

[0011] According to the present invention, it is possible to provide a gripper-side plate clamp device for a single-sheet printing machine that is easy to repair when the flatness of the clamping surface of the lower teeth deteriorates.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0013] Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to FIGS. 1 to 7. It should be noted that the following embodiments do not limit the invention according to each claim, and not all combinations of the features described in the embodiments are essential for the solution means of the invention.

[0014] The gripper-side plate clamping device 30 of the single-sheet printing press according to this embodiment is arranged side by side in the circumferential direction together with the gripper-tail-side plate clamping device 60 within the notch 11 of the plate cylinder 10. The plate 1 mounted on the plate cylinder 10 has its gripper-side end portion in the circumferential direction clamped by the gripper-side plate clamping device 30 and its gripper-tail-side end portion clamped by the gripper-tail-side plate clamping device 60. Specifically, the plate 1 is clamped in a state where its gripper-side end portion is positioned by the gripper-side plate clamping device 30, and after being wound around the outer peripheral surface of the plate cylinder 10, its gripper-tail-side end portion is clamped by the gripper-tail-side plate clamping device 60. Further, the plate 1 is mounted in a state of being in close contact with the outer peripheral surface of the plate cylinder 10 by applying tension by the movement of the gripper-tail-side plate clamping device 60. Note that the plate 1 is a PS plate.

[0015] The plate cylinder 10 has a cylinder portion 12 around which the plate 1 is wound, and disk-shaped bearings 13, 14 fixed to both axial ends of the cylinder portion 12. The diameters of the bearings 13, 14 are slightly larger than the diameter of the cylinder portion 12. The notch 11 is formed as a groove-shaped recess extending in the axial direction within a predetermined circumferential range of the outer peripheral portion of the cylinder portion 12. As shown in FIG. 3, the inner surface of the notch 11 has a gripper-side bottom surface 15 located on the lower side (radially inner side) of the gripper-side plate clamping device 30, a gripper-side side surface 16 located on the gripper-tail-side plate clamping device 60 side opposite to the gripper-side plate clamping device 30, a gripper-tail-side bottom surface 17 located on the lower side of the gripper-tail-side plate clamping device 60, and a gripper-tail-side side surface 18 located on the gripper-side plate clamping device 30 side opposite to the gripper-tail-side plate clamping device 60. The gripper-side bottom surface 15, the gripper-side side surface 16, the gripper-tail-side bottom surface 17, and the gripper-tail-side side surface 18 are parallel to the axis of the plate cylinder 10.

[0016] As shown in Fig. 2, four spacers 21 are arranged on the holding-side bottom surface 15 at intervals in the axial direction. The four spacers 21 are arranged at the distributed positions with respect to the axial center of the plate cylinder 1. The spacer 21 has a rectangular parallelepiped appearance. As shown in Fig. 7, each spacer 21 is fixed to the holding-side bottom surface 15 by two bolts 23. The upper surface 21a of each spacer 21 is parallel to the lower surface 21b in contact with the holding-side bottom surface 15. The upper surfaces 21a of the four spacers 21 are located in a common plane parallel to the axis. The spacer 21 has an insertion hole 22 penetrating in a direction orthogonal to the upper surface 21a. Among the four spacers 21, the spacers 21 located at both axial ends are arranged within a predetermined distance inside (on the axial center side of the plate cylinder 10) from both axial ends of the holding-side plate chuck device 30.

[0017] The holding-side plate vise device 30 is configured to be slightly shorter than the entire length of the notch 11. The holding-side plate vise device 30 includes a lower tooth 31 and a movable upper tooth 41. The lower tooth 31 has a substantially rectangular cross-sectional shape and extends integrally over substantially the entire length of the holding-side plate vise device 30. The lower surface 32 of the lower tooth 31 is in contact with the upper surfaces 21a of the four spacers 21. The lower surface 32 of the lower tooth 31 and the holding-side bottom surface 15 of the notch 11 are separated by the vertical thickness of the spacer 21. The lower tooth 31 is fixed to the holding-side bottom surface 15 of the notch 11 by fixing bolts 24 which are fixing means at the positions of the four spacers 21. In the present embodiment, the fixing bolts 24 are hexagon socket head bolts. As shown in FIG. 7, the lower tooth 31 has bolt insertion holes 34 which penetrate the lower tooth 31 in the vertical direction as counterbores at positions facing the insertion holes 22 of the four spacers 21. Each fixing bolt 24 is screwed into the holding-side bottom surface 15 through the bolt insertion holes 34 and the insertion holes 22 of the spacers 21 from above. That is, the lower tooth 31 is fixed to the holding-side bottom surface 15 of the notch 11 by four fixing bolts 24 arranged at intervals in the axial direction of the plate cylinder 10. Also, spacers 21 are interposed between the lower surface 32 of the lower tooth 31 and the holding-side bottom surface 15 at the positions of the four fixing bolts 24. Incidentally, at a position facing the bolt insertion holes 34 of the upper tooth 41, holes 47 for inserting a tool for rotating the fixing bolts 24 from above are formed. The holes 47 are smaller in diameter than the heads of the fixing bolts 24.

[0018] On the upper surface 35 of the lower tooth 31, a clamping surface 33 for clamping the holding-side end portion of the plate 1 between the upper tooth 41 extends in the axial direction. The clamping surface 33 is formed on the holding-side side surface 16 side of the upper surface 35 of the lower tooth 31. The clamping surface 33 is a plane parallel to the axis of the plate cylinder 10 and is also parallel to the lower surface 32. The clamping surface 33 is formed over the entire length of the lower tooth 31. On the opposite holding-side side surface 16 side of the upper surface 35 of the lower tooth 31, a camshaft support recess 37 having a substantially semi-circular groove shape in cross-section for supporting a camshaft 45 for moving the upper tooth 41 extends in the axial direction. The camshaft support recess 37 is formed over the entire length of the lower tooth 31.

[0019] The upper teeth 41 are arranged above (radially outside) the lower teeth 31. The upper teeth 41 are formed to be smaller (thinner) in the vertical dimension (thickness) than the lower teeth 31 in cross-sectional view, and the tip portion (the end portion on the side of the holding side surface 16) becomes thinner toward the tip. The upper teeth 41 cover most of the upper surface 35 of the lower teeth 31. The upper teeth 41 have an integral structure having substantially the same overall length as the holding side plate chucking device 30 of the lower teeth 31, but have a divided structure that is substantially equally divided in the axial direction. Each upper tooth 41 is swingably supported by four fulcrum bolts 42 arranged side by side in the axial direction. The fulcrum bolts 42 are screwed into the lower teeth 31 through dish-shaped holes formed in the upper teeth 41 from above (radially outside). A spherical washer 43 is installed on the head of the fulcrum bolt 42. The upper teeth 41 swing with the dish-shaped portion of the dish-shaped hole supported by the spherical washer 43. By swinging the upper teeth 41 in the direction (closing direction) in which the lower surface 44 of the tip portion on the tip side approaches the clamping surface 33, the holding side end portion of the plate 1 located between the clamping surface 33 and the lower surface 44 of the tip portion is clamped. By swinging the lower surface 44 of the tip portion of the upper teeth 41 in the direction (opening direction) away from the clamping surface 33, the clamping of the plate 1 is released. The swinging (opening and closing movement) of the upper teeth 41 is executed by the rotation of a camshaft 45 rotatably supported in a camshaft support recess 37 of the lower teeth 31. Incidentally, the upper teeth 41 are biased in the opening direction by a spring (not shown).

[0020] As shown in Fig. 5, the gripping-side plate vise device 30 includes a pressing screw 51. The pressing screw 51 is screwed into a female screw hole 52 formed by penetrating the lower teeth 31 in the vertical direction. The female screw hole 52 is orthogonal to the clamping surface 33. The female screw hole 52 has a female screw 52a formed in a predetermined depth range from the lower surface 32 to the upper surface 35 of the lower teeth 31, and a small-diameter hole 52b that reaches the upper surface 35 of the lower teeth 31 from the upper end of the female screw 52a. The small-diameter hole 52b is a lower hole drilled for the formation of the female screw 52a. Therefore, the pressing screw 51 screwed into the female screw hole 52 can come out on the lower surface 32 side but cannot come out on the upper surface 35 side. The tip of the pressing screw 51 is a set screw with a hexagonal hole at the tip of a rod, and its hardness is increased by heat treatment. The pressing screw 51 is subjected to a process that exhibits a loosening prevention function at the longitudinal intermediate portion. The pressing screw 51 is screwed into the female screw hole 52 from the lower surface 32 side with the tip of the rod facing downward. Usually, the pressing screw 51 is housed in the female screw hole 52 as shown in Fig. 5.

[0021] As shown in Figs. 1 and 2, the female screw holes 52 are formed at a total of five locations, three locations between adjacent fixing bolts 24 in the axial direction and two locations further on the end side from the fixing bolts 24 at both axial ends. The three female screw holes 52 are arranged at the axial center between adjacent fixing bolts 24 in the axial direction. Among the three female screw holes 52, the female screw hole 52 at the axial center is located at the axial center of the plate cylinder 1. Also, the two female screw holes 52 are arranged close to the axial ends. The pressing screws 51 are screwed into the respective female screw holes 52.

[0022] Plates 53 are arranged on the gripping-side bottom surface 15 where the tips (lower ends) of the respective pressing screws 51 face each other. Each plate 53 is fixed to the gripping-side bottom surface 15 by two plate fixing bolts 54 arranged in the axial direction.

[0023] Among the four upper teeth 41, the upper teeth 41 on both axial ends cover two threaded holes 52 respectively. At the positions of the upper teeth 41 facing the small-diameter holes 52b of the threaded holes 52, tool insertion holes 46 are formed. The tool insertion holes 46 are for inserting a tool 55 for rotating the pressing screw 51 from above. The tool insertion holes 46 have a diameter larger than that of the small-diameter holes 52b. Note that the small-diameter holes 52b of the threaded holes 52 located at the axial center of the plate cylinder 1 are not covered by the upper teeth 41.

[0024] As shown in Fig. 6, the pressing screw 51 can protrude from the lower surface 32 of the lower teeth 31 by a rotation operation and press the holding-side bottom surface 15 of the notch 11 via the plate 53. The rotation operation of the pressing screw 51 is performed by a tool 55 inserted into the hexagonal hole at the upper end of the pressing screw 51 from above through the tool insertion hole 46 and the small-diameter hole 52b. Note that in the rotation operation of the pressing screw 51 screwed into the threaded hole 52 located at the axial center of the plate cylinder 1, the tool 55 does not pass through the tool insertion hole 46. When the pressing screw 51 presses the holding-side bottom surface 15, the lower teeth 31 around the position where the pressing screw 51 is located are displaced upward. The displacement amount of the lower teeth 31 can be adjusted by adjusting the pressing amount of the pressing screw 51. Note that the lower teeth 31 do not displace at the position of the fixing bolt 24.

[0025] For example, when the pressing screw 51 positioned between the adjacent fixing bolts 24 in the axial direction presses the gripping side bottom surface 15, the lower teeth 31 are displaced upward with the region between the fixing bolts 24 as the top with the position of the pressing screw 51 as the apex. Also, along with this displacement, the clamping surfaces 33 in the corresponding range are also displaced upward. At this time, since the pressing screw 51 is positioned at the axial center between the adjacent fixing bolts 24, in the region between the fixing bolts 24, the distribution of the displacement in the axial direction is substantially symmetric with the pressing screw 51 in between. On the other hand, in the regions adjacent to both axial ends with the fixing bolts 24 interposed therebetween in this region, the lower teeth 31 are displaced downward by the reaction of the upward displacement. And along with this displacement, the clamping surfaces 33 in the corresponding range are also displaced downward. Incidentally, Fig. 6 shows a state where the gripping side plate vice device 30 has opened the upper teeth 41 by operating the cam shaft 45. By setting it to the opened state, the displacement of the clamping surface 33 can be easily confirmed.

[0026] Also, for example, when the pressing screw 51 positioned at the axial end of the gripping side plate vice device 30 presses the gripping side bottom surface 15, from the fixing bolt 24 positioned closest axially to the pressing screw 51 to the end on the side of the pressing screw 51 is displaced upward like a cantilever beam. Along with this displacement, the clamping surfaces 33 in the corresponding range are also displaced upward. On the other hand, in the region adjacent to the center side in the axial direction of this region with the fixing bolts 24 interposed therebetween, the lower teeth 31 are displaced downward by the reaction of the upward displacement. And along with this displacement, the clamping surfaces 33 in the corresponding range are also displaced downward.

[0027] Thus, in each region of the lower teeth 31 partitioned by the four fixing bolts 24 arranged at intervals in the axial direction, due to the pressing of the gripping side bottom surface 15 by a specific pressing screw 51, the region where the pressing screw 51 is located is displaced upward, and the regions adjacent to this region are displaced downward.

[0028] Further, if the side bottom surface 15 is pressed simultaneously by the pressing screws 51 at a plurality of positions and the pressing amount of each pressing screw 51 is adjusted individually, the distribution of the displacement in the axial direction of the lower teeth 31 can be set freely to some extent. That is, the distribution of the displacement in the axial direction of the clamping surface 33 can be set freely to some extent. For example, it is also possible to displace both of two adjacent regions in the axial direction upward.

[0029] In this way, by displacing the lower teeth 31 using the pressing screws 51, the deformation of the lower teeth 31 can be corrected. That is, the flatness of the lowered clamping surface 33 can be increased using the pressing screws 51. Empirically, the deformation generated on the clamping surface 33 is partitioned by four fixing bolts 24 arranged at intervals in the axial direction, and in each region arranged side by side in the axial direction, the upward deformation and the downward deformation often exist alternately in the axial direction. When the side bottom surface 15 is pressed by the pressing screw 51 in the region deformed downward, this region deformed downward is displaced upward simultaneously, and the adjacent region deformed upward is displaced downward. Thereby, the flatness of the lowered clamping surface 33 can be easily increased. Further, since the pressing screw 51 located between the fixing bolts 24 adjacent in the axial direction is located at the axial center between the fixing bolts 24, the distribution of the displacement generated by the pressing of the pressing screw 51 can be easily imagined, so that the work of increasing the flatness of the lowered clamping surface 33 becomes easy. Further, the operation of the pressing screw 51 can be performed while the holding-side plate vise device 30 is attached in the notch 11, so that it does not become a large-scale correction work. That is, in the correction work, it is not necessary to remove the holding-side plate vise device 30 from the notch 11 and take it out of the printing machine. Furthermore, since the pressing screw 51 is subjected to a process that exhibits a loosening prevention function, the adjusted pressing amount does not change unintentionally. Still further, since a plate 53 is interposed between the pressing screw 51 and the side bottom surface 15, it is possible to prevent the side bottom surface 15 from being damaged by the pressing of the pressing screw 51 and the pressing amount from changing unintentionally.

[0030] As described above, embodiments of the present invention have been explained. However, the technical scope of the present invention is not limited to the scope described in the above embodiments. Various changes or improvements can be made to the above embodiments.

[0031] For example, in the above-described embodiment, the upper teeth 41 had a four-part configuration that was approximately equally divided in the axial direction of the plate cylinder 10, but it is not limited to this. For example, it may not be equally divided in the axial direction, or it may not be divided at all.

[0032] Also, for example, in the above-described embodiment, the pressing screw 51 was disposed further on the end side of the fixing bolt 24 on the axial end side of the plate cylinder 10. However, when the position of the fixing bolt 24 on the axial end side is close to the axial end of the lower teeth 31, this pressing screw 51 may be omitted.

[0033] Also, for example, in the above-described embodiment, there was a configuration in which four fixing bolts 24 and five pressing screws 51 were arranged, but the numbers of the fixing bolts 24 and the pressing screws 51 are not limited to this. For example, a configuration in which two fixing bolts 24 and three pressing screws 51 are arranged may be used, or a configuration in which three fixing bolts 24 and four pressing screws 51 are arranged may be used.

Explanation of Reference Numerals

[0034] 1: Plate 10: Plate cylinder 11: Notch 12: Cylinder part 13: Bearing 14: Bearing 15: Gripping side bottom surface 16: Gripping side side surface 17: Gripping rear side bottom surface 18: Gripping rear side side surface 21: Spacer 21a: Upper surface 21b: Lower surface 22: Insertion hole 23: Bolt 24: Fixing bolt 30: Gripping side plate vise device 31: Lower teeth 32: Lower surface 33: Clamping surface 34: Bolt insertion hole 35: Upper surface 37: Camshaft support recess 41: Upper teeth 42: Fulcrum bolt 43: Spherical washer 44: Lower surface of the tip 45: Camshaft 46: Tool insertion hole 47: Hole 51: Pressing screw 52: Female thread hole 52a: Female thread 52b: Small-diameter hole 53: Plate 54: Plate fixing bolt 55: Tool 60: Jaws-side plate vice device

Claims

1. In a gripper-side plate chuck device for a sheet-fed printing press that is disposed within a notch of a plate cylinder and sandwiches an end portion of a plate that is wound around an outer peripheral surface of the plate cylinder between a lower tooth and an upper tooth that is movable, a plurality of fixing means that are spaced apart in an axial direction of the plate cylinder and fix the lower tooth to a bottom surface of the notch; a menegi hole that is formed to penetrate the lower tooth in a vertical direction and is disposed between adjacent fixing means; and a pressing screw that is screwed into the menegi hole and can press the bottom surface of the notch by an operation from an upper surface side of the lower tooth where a clamping surface is formed. The gripper-side plate chuck device for a sheet-fed printing press is characterized by including these components.

2. The gripper-side plate chuck device for a sheet-fed printing press according to claim 1, further comprising a menegi hole that is formed to penetrate the lower tooth in a vertical direction and is disposed outside fixing means at both axial ends of the plate cylinder.

3. The gripper-side plate chuck device for a sheet-fed printing press according to claim 1, wherein the menegi hole is disposed at an axial center between adjacent fixing means.

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