JPH025953Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate holding device that presses one end of a plate attached to a plate cylinder in a sheet-fed rotary printing press.

When a printing plate is mounted on the peripheral surface of the plate cylinder of a sheet-fed rotary printing press, one of the pair of vise stands provided in the notch on the outer circumference of the plate cylinder is first placed on the gripping side in the direction of rotation of the cylinder. Hold one end of the plate in the vise stand on the leading side, wrap the plate around the circumference of the body, and then place the other end of the plate in the vise stand on the side that lags in the direction of rotation of the body, called the butt side. This is done by holding it in your mouth and tightening it.

FIG. 1 is a cross-sectional view of a conventional grip-side vise stand, and this will be explained based on the figure.A notch 2 is provided on the outer periphery of the plate cylinder 1 along its entire length.
A vice stand 3, which is slightly shorter than the entire length of the plate cylinder 1, is provided inside the plate cylinder 1, and is prevented from rising from the bottom of the notch 2 by a holding plate (not shown) for preventing lifting. A retaining plate 4, which is divided into a plurality of parts in the longitudinal direction, is attached to the vise stand 3 by being held down at two longitudinal points by the heads of bolts 5 screwed into the vise stand 3. ing. Further, a presser shaft 6 having a notch 6a is provided at the end edge of the vice stand 3 for each presser plate 4 over its entire length.
One end of the press plate 4 is engaged with the notch 6a.

In order to hold the plate 7 with the vise stand configured in this way, one end of the plate 7 is inserted between the presser plate 4 and the vise stand 3, and a separately prepared jig pin 8 is inserted into the presser plate. After temporarily holding the plate 7 by inserting it through the holes provided in the plate 4, the plate 7, and the vise stand 3, the handle 9 is inserted into the handle hole provided in the large diameter part of the presser shaft 6. Rotate in the direction shown by arrow A in the figure. Since the presser plate 4 and the bolt 5 are engaged with each other by the arc-shaped convex and concave surfaces, when the handle 9 is rotated, one end of the presser plate 4 is moved from the notch 6a of the presser shaft 6 to the circular arc portion. When twisted and pushed up, the presser plate 4
It rotates around the support provided by the bolt 5, and strongly clamps the plate 7 between the tip and the vice stand 3. By removing the pin 8, holding of the plate 7 is completed. Thereafter, the plate 7 is wrapped around the circumferential surface of the plate cylinder 1, and the other end of the plate 7 is held by a vise stand and a presser plate on the rear side in the same manner as described above.

In such a conventional plate holding device, as is clear from the figure, when the plate 7 is temporarily held by the pins 8, the tip is inclined so as to float above the gripping surface of the vice table 3. . Plate 7 tilted like this
Since the plate 7 is held down sequentially by a plurality of presser plates 4, the plate 7 moves in the circumferential direction of the plate cylinder 1 as the plate 7 is pressed down, and as the amount of movement differs for each presser plate 4, the plate The entire printing plate 7 was installed at an angle rather than parallel to the axial direction of the printing cylinder 1, resulting in a problem that the printing plate 7 was misregistered with respect to the printing paper. Further, as a result of investigating other factors that cause the plate 7 to be installed at an angle, the following was found. That is, in general, before the plate 7 is held in the vise stand 3, the vise stand 3 is
The vise stand 3 is positioned in parallel by inserting a plurality of block gauges between the wall surface of the cutout 2 and the wall surface of the notch 2, and pressing the vise stand 3 against the block gauges. There may be slight errors or you may forget to guess. In addition, in special cases where the pattern is printed in a way that is twisted relative to the outer shape of the plate 7, the parallelism of the pattern may be adjusted by intentionally moving the vice 3 after positioning it with the block gauge. Also, when replacing the plate with a normal plate, I sometimes forget to return the vise stand 3 to its normal position. Although the vise stand 3 itself may be distorted due to the reasons mentioned above, since the reference pin 8 is supported on the vise stand 3 side, the plate 7 can be held by the pin 8 even if it is not accurate. Even if this is done, the plate 7 will be installed in a distorted state.

The present invention was developed in view of the above points, and includes drilling a reference hole in the positioning member that is fixed to the plate cylinder side and engages with the vise table, and also steps the pins that temporarily hold the plate. The plate is temporarily inserted into the reference hole by inserting the tip of the pin into the reference hole while pressing the plate toward the vise table with the stepped part of the pin inserted from the presser plate side through the plate and vise table. The present invention provides a plate holding device for a sheet-fed rotary printing press that is configured to hold the plate, thereby making it possible to mount the plate on the plate cylinder with accurate registration accuracy. Embodiments of the present invention will be described in detail below with reference to the drawings.

2 to 5 show an embodiment of the plate holding device according to the present invention, FIG. 2 is a plan view of a plate cylinder in which this is implemented, FIG. 3 is a BB sectional view of FIG. 2, and FIG. 4 is a sectional view taken along CC in FIG. 3, and FIG. 5 is an operation explanatory diagram showing the cross section expanded for easy understanding. In the figure, the outer periphery of the plate cylinder 11 has a notch 12 on the gripping side.
and a notch 13 on the bottom side are provided in parallel to each other over the entire length of the plate cylinder 11 excluding the bearer 14,
In each of the notches 12 and 13, a grip-side plate holding device, generally designated by reference numeral 15, and a rear-side plate holding device, designated by reference numeral 16, are provided symmetrically to each other. Among these, in the plate holding device 15 on the gripping side, a vise 17 formed with a rectangular cross section and slightly shorter than the entire length of the notch 12 is attached to a bolt 18 whose head is in contact with the bearer 14. It is positioned and provided in the length direction. In addition, grooves 19 having stepped portions are provided at three locations in the longitudinal direction of the vise table 17, as shown in FIG. The stepped portion of the positioning plate 21 is inserted into and engaged with the stepped portion of the groove 19, thereby restricting the vise table 17 from floating up. Note that the vise stand 17 is movable in the front, back, left and right directions with respect to the positioning plate 21.
Further, bolts 22 for positioning the vise table 17 in the circumferential direction of the plate cylinder 11 are screwed into five locations in the longitudinal direction of the vise table 17 with their tips abutting against the wall surface of the notch 12.

Reference numeral 23 denotes a holding plate formed to have a length that divides the vise table 17 into five equal parts in the length direction, and each holding plate 23 has a pair of bolt holes each having a counterbore with an oval arcuate cross section. A bolt 26 having a semicylindrical washer 25 that engages with the counterbore is inserted into each bolt hole 24, and the threaded portion thereof is screwed into the screw hole of the vise stand 17. is included. Further, five presser shafts 28 corresponding to each presser plate 23 are supported in a groove 27 provided along the entire length of the edge of the vise table 17. The collar-shaped large diameter portion 29 is attached to each presser plate 2.
It is engaged with the notch provided in 3. Furthermore, each presser shaft 28 is provided with a notch 30 extending over its entire length and engaging the end edge of the presser plate 23 .
Then, by inserting the handle 31 into the handle hole provided in the large diameter portion 29 of the presser shaft 28 and rotating the presser shaft 28, the end edge of the presser plate 23 is aligned with the notch 30 of the presser shaft 28 and the circular arc portion. The retaining plate 23 is configured to selectively face either of the two and swing around the arcuate core of the washer 25. Further, a plurality of spring holes provided in the vise stand 17 corresponding to each presser plate 23 are loaded with a top 32 and a compression coil spring 33 that urges the top toward the presser plate 23. This allows the holding plate 23 to fit into the bolt hole 2.
The arcuate counterbore portion of No. 4 is pressed against the arcuate surface of the washer 25.

Further, pin holes 3 are provided at the ends of the presser plate 23, the vice stand 17, and the plate 7 inserted between them.
4, 35, and 36 are bored in the positioning plate 21, and a reference hole 37 is also bored in the positioning plate 21, and these holes 34, 35, 36, and 37 are connected to the presser foot as shown in FIG. 5b. The holes are positioned and drilled so that when the plate 7 is held between the plate 23 and the vise 17, the centers of the holes are substantially concentric. 38 is a pin formed in a T-shape for temporarily holding the plate 7;
8a and a large diameter portion 38b, it is formed in a stepped shape,
Small diameter portion 38a, reference hole 37 and pin hole 3 of plate 7
6 and the diameter is set so that it fits tightly. Further, the small diameter portion 38a is connected to the pin hole 3 of the vice stand 17.
5, the large diameter portion 38b penetrates the pin hole 34 of the press plate 23 in a loose state, and the plate 7 is held in a vise at the step between the small diameter portion 38a and the large diameter portion 38b. It is configured to be pressed against the stand 17. Note that the reference numeral 39 in FIG.
and 41 are a set screw for locking the bolt 26 and a braking member. In addition, vise stand 17
A plurality of block gauges 42 are inserted between the wall surface of the cutout 12 and the vise stand 17.
A pin 43 with a spring is provided to bias the wall in a direction that separates the wall from the wall surface.

Regarding the plate holding device 16 on the bottom side, the pin hole for the pin 38 that temporarily holds the plate 7 is not provided, and the shape of the member (not shown) that prevents the vise table 17 from floating is different. The other is the plate holding device 1 on the gripping side.
Since it has the same configuration as 5, the explanation thereof will be omitted.

The operation of mounting a plate on the plate cylinder configured as described above will be explained. First, the positioning plate 21 is fixed to the bottom surface of the notch 12 with bolts 20 before positioning the vise table 17. During this fixing, all the reference holes 37 are aligned parallel to the axis of the plate cylinder 11. Correctly positioned so that they are in a straight line. Therefore, the vise stand 17 is positioned using the block gauge 42 so that the pin hole 35 and the reference hole 37 almost coincide with each other, and the bolts 18, 2
Fix it at 2. At this time, each presser plate 23 is attached to the vice stand 17 with bolts 26, and a presser shaft 28 engages the end edge thereof, and presses the arcuate surface of the bolt hole 24 against the washer 25. Top 3
2 and a compression coil spring 33 are attached. Therefore, as shown in FIG.
8a fits into the reference hole 37 of the correctly positioned positioning plate 21 and the pin hole 36 of the plate 7, and also fits between the small diameter part 38a and the large diameter part 3 of the pin 38.
The plate 7 is pressed against the vise stand 17 at the step with the plate 8b.
FIG. 5a shows the state where the pin 38 has been inserted, and in this case, even if the pin 38 is released, the pin 38 will come out because the fit between the small diameter part 38a and the reference hole 37 is tight. Never. After the plate 7 is temporarily held by the pin 38 in this way, when the handle 31 is inserted into the handle hole of the presser shaft 28 and rotated counterclockwise in FIG. 5, the presser is held as shown in FIG. 5b. The end edge of the plate 23 faces the arcuate portion of the presser shaft 28, and the presser plate 23 swings around the arcuate center of the washer 25, and presses the plate between its tip and the gripping surface of the vice stand 17. Hold 7 firmly. In this case, since the end edge of the presser plate 23 is strongly pressed against the presser shaft 28 by the lever action, the presser shaft 28 will not rotate even if the handle 31 is pulled out. In this way, each presser shaft 28 is sequentially rotated to clamp the plate 7, and then the pin 38 is pulled out, thereby completing the plate-pressing operation on the gripping side. Therefore, wrap the plate 7 around the body circumference,
After inserting the other end between the vise stand 17 of the plate holding device 16 on the bottom side and the holding plate 23, the holding shaft 28 is rotated by the handle 31 to clamp the other end of the plate 7.
Then, the mounting of the plate 7 is completed by tightening the bolt 22 and pulling the plate 7 together with the vise stand 17 to bring it into close contact with the circumferential surface of the plate cylinder 11.

Among these plate mounting operations, in the plate holding operation on the gripping side, the reference hole 3 supporting the pin 38 is
7 is provided on the side of the positioning plate 21 that has been accurately positioned in advance, and the pin 38 is firmly fitted into the reference hole 37 and the pin hole 36 of the plate 7, and the plate 7 is held securely at the stepped portion of the pin 38. While pressing the plate 7 toward the force table 17 side, press the plate 7 between the press plate 23 and the vise table 17.
Since the plate 7 is held between the plate cylinder 11 and the plate cylinder 11,
It can be mounted with extremely accurate registration accuracy parallel to the axis of the machine.

6 and 7 are a side sectional view and a longitudinal sectional view of a plate holding device showing another embodiment of the present invention corresponding to FIGS. 3 and 4, in which the pin 38 is The small diameter portion 38a of the positioning plate 21
In contrast, in this embodiment, a bush 44 whose upper end surface is flush with the upper end surface of the vise table 17 is fitted into the reference hole 37A of the positioning plate 21. The small diameter portion 38a of the pin 38 is fitted into the inner hole of the bush 44, and the vise stand 17 is formed with a U-shaped groove through which the bush 44 is loosely inserted. The other configurations are the same as those of the previous embodiment. With this configuration, the same effect as in the embodiment described above is obtained, the small diameter portion 38a of the pin 38 can be shortened, and the inner hole of the bush 44, which serves as a reference hole, is close to the plate 7. , the pin 38 can be easily inserted, and the small diameter portion 38 does not bend, further improving the registration accuracy of the plate 7.

As is clear from the above description, according to the present invention, in the plate holding device of a sheet-fed rotary printing press, a reference hole is bored in the positioning member fixed to the plate cylinder side and engaged with the vise table, and A pin that temporarily holds the plate is formed into a step shape, and the tip of the pin is inserted from the presser plate side through the plate and the vise stand while pressing the plate toward the vise stand using the step part of the pin. By being configured to fit into the reference hole and support it, it is held by the pin that fits tightly between the reference hole that has been accurately positioned in advance and the pin hole of the plate, and is pressed toward the vise side by the stepped portion of the pin. Since the plate can be firmly clamped between the presser plate and the vise stand in this state, the plate is mounted extremely accurately without distortion, and the registration accuracy of the plate is significantly improved. It is easy and can shorten working time, improving work efficiency. Furthermore, since the pin holes in the plate are not deformed, the durability of the plate is improved in the case of reprinting. Furthermore, the reference hole for the pin is provided on the positioning member side so that the pin and vise stand are loose, so even if the plate vise is slightly distorted after using a special plate, the plate can be mounted accurately. can do.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional plate holding device, Figs. 2 to 7 show an embodiment of the plate holding device of a sheet-fed rotary printing press according to the present invention, and Fig. 2 is a plate cylinder in which this is implemented. 3 is a sectional view of BB in FIG. 2, FIG. 4 is a sectional view of CC in FIG. FIG. 4 is a side sectional view and a vertical sectional view showing another embodiment of the present invention corresponding to FIGS. 3 and 4; 7... Plate, 11... Plate cylinder, 15... Plate holding device, 17... Vise stand, 21... Positioning plate, 23
... Holding plate, 37 ... Reference hole, 38 ... Pin, 3
8a...Small diameter part, 38b...Large diameter part.

Claims (1)

[Scope of utility model registration request] The pin 3 inserted through the vice stand 17 and the presser plate 23 and the plate 7 with one end inserted between them
In the plate holding device which holds the plate 7 by temporarily holding the plate 7 at step 8 and pressing the presser plate 23 toward the vise stand 17, the plate holding device is fixed to the plate cylinder 11 and the vise stand 1 is fixed to the plate cylinder 11.
A reference hole 37 is formed in the positioning member 21 that engages with the plate cylinder 11 to prevent the vise table 17 from floating up, and the pin 38 is inserted into the pin hole 36 of the plate 7.
and a small diameter portion 38a that fits into the reference hole 37, and a large diameter portion 38b that passes through the pin hole 34 of the holding plate 23 and presses the plate 7 toward the vise table 17 at a step between the small diameter portion 38a and the small diameter portion 38a. A plate holding device for a sheet-fed rotary printing press, which is formed in a step-like manner with the vise table 17 and the pins 38 to temporarily hold the plate 7 in a substantially loose state.