JPH0966598A - Plate mounting structure for rotary press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate mounting structure for a rotary press which makes it possible to easily and effectively mount a plate and to increase a plate drawing load as well. SOLUTION: The plate mounting structure for a rotary press comprises a winding rod 2 rotatably inserted into the long slot 7 of a plate cylinder 6, and a retainer 1 made of a leaf spring and inserted into the slot 3 of the rod to hold the gripper side 8a of a plate 8 and the tail side 8b to the gripper side, wherein the end 1a for holding the plate gripper side of the retainer is bent in an L shape in the plate tension rotating direction of the rod 2 similarly to the end 1b for holding the tail side to the gripper side of the retainer to perform the guiding operation in case of mounting the plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate mounting structure for winding a printing plate around a plate cylinder in a web-fed rotary printing press.

[0002]

2. Description of the Related Art A plate of a web-fed rotary printing press, after being wound around a plate cylinder, has its gripping side and rear side engaged with a winding rod in an axial long groove formed on the outer peripheral surface of the plate cylinder. By rotating the winding rod in a predetermined direction, the winding rod is drawn into the long groove and is attached to the plate cylinder in a tensioned state. The plate mounted on the plate cylinder has equal tension in each direction,
In addition, it is required to be firmly held so as to prevent loosening and register errors during printing.

This plate mounting structure is conventionally shown in FIGS. 7 and 8.
(See Japanese Patent Laid-Open No. 5-6 of the present applicant)
9531, etc.). In FIG. 7, reference numeral 21 is a retainer, which is housed in a kerf 3 having a relatively large tapered cross section formed in the winding rod 2 and is positioned and fixed by a pin 4. The retainer 21 is a single V-shaped spring steel, and a plurality of retainers 21 are attached to the winding rod 2 at a predetermined distance in the axial direction in a compressed state. The end portion 21a on the left side in FIG. 7 of the retainer 1 is pressed by the spring force between the inclined surface 7a of the long groove 7 formed in the plate cylinder 6 and the plate 8
The holding side 8a is pressed. On the other hand, the end portion 21b on the right side in FIG. 7 of the retainer 1 is bent into an L-shape, and the plate 8 is also engaged with the tail side 8b bent in the L-shape in the plate tension direction. There is.

On the other hand, as shown in FIG. 8, a hexagonal portion 9 is formed at the end of the winding rod 2 so that the winding rod 2 can be rotated in any direction by a tool 15 such as a spanner. There is. A lever 10 is fitted to the base of the hexagonal portion 9, and a spring guide 12 for guiding the compression coil spring 11 is provided at the end thereof.
Are rotatably connected. Reference numeral 13 in the drawing denotes a spring holder attached to the bearer 14 on the end face of the plate cylinder.
Then, the hexagonal portion 9, that is, the winding rod 2 is rotationally biased counterclockwise (plate tension direction) by the spring force of the compression coil spring 11, and is balanced with the spring force of the retainer 21 in the state shown in FIG. 7. Therefore, at the time of mounting and separating the plate 8, the hexagonal portion 9, that is, the winding rod 2 is rotated clockwise (plate loosening direction) against the spring force by the tool 15 such as a wrench so that both ends of the retainer 21 are rotated. 21a and 21b are the holding side 8a and the butt side 8 of the plate 8.
It is necessary to once move them to positions that are sufficiently retracted with respect to b.

[0005]

However, in the plate mounting structure described above, the retainer 21 has an end portion 21a for holding the plate gripping side which is formed in an arc shape, and its tip faces the opening portion of the long groove 7. As it is designed to be inserted, the retainer 21
Since the end portion 21a for holding the plate holding side of the plate presses the holding side 8a of the plate 8 by surface contact, the plate pull-in load is small, and a so-called plate floating phenomenon may occur, which may lead to printing failure. .

Therefore, an object of the present invention is to provide a plate mounting structure for a rotary printing press which can increase the plate pulling load.

[0007]

A plate mounting structure of a rotary printing press according to the present invention for achieving the above object has a winding rod rotatably inserted into a long groove of a plate cylinder, and the winding rod. Has a retainer that is inserted into the cut groove of the retainer for holding the gripping side and the butt side of the plate, and has an end for holding the plate holding side of the retainer and an end for holding the plate butt side of the retainer. It is characterized in that the winding rod is bent in the plate rotation direction.

According to the above construction, the end portion of the retainer for holding the plate holding side is brought into line contact with the holding side of the plate at an acute angle, and the plate drawing load is increased.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a front sectional view of a main part of a plate cylinder adopting this structure, FIG. 2 is a view showing a mounting procedure of the plate, FIG. 3 is a front view of the main part of the plate cylinder, and FIG. FIG. 5 is a front view of the cylinder, and FIG. 5 is a side view of a part of the plate cylinder with a part thereof cut away. In these figures, the same members as those in FIGS. 7 to 9 are designated by the same reference numerals, and the duplicated description will be omitted.

As shown in FIG. 5, one long groove 7 is formed in the axial direction on the outer peripheral surface of the plate cylinder 6, and a plurality of retainers 1 for holding the plate are provided in the long groove 7 in the axial direction. The winding rod 2 penetrates rotatably. Reference numeral 14 in the drawing denotes a bearer fitted to the shaft end of the plate cylinder 6.

As shown in FIG. 4, a hexagonal portion 9 is formed at the shaft end of the winding rod 2, and a first lever 10 is fitted to the hexagonal portion 9. An upper end of a spring guide 12 for guiding the compression coil spring 11 is rotatably connected to a pin 15 at one end of the lever 10, and a lower end screw shaft portion 12a thereof is supported by a holder 13 via a spring receiver 16. There is. Therefore, the hexagonal portion 9, that is, the winding rod 2 is urged to rotate counterclockwise (plate tension direction) by the spring force of the compression coil spring 11, and balances with the spring force of the retainer 1.

As shown in FIG. 3, a second lever 17 is further fitted on the outside of the hexagonal portion 9, and the lever 17 is rotated clockwise (a plate loosening direction) by an air cylinder 18. Thus, the rotating operation of the winding rod 2 at the time of mounting the plate and separating the plate is automated.

In the present embodiment, as shown in FIG. 1, the retainer 1 housed in the cut groove 3 of the winding rod 2 and positioned by the pin 4 is a single V-shaped retainer. It is made of spring steel, and can be compressed and restored in the kerf 3 and is dimensioned to pass through the opening of the long groove 7 of the plate cylinder 6 when compressed.

The retainer 1 has an end portion 1a for holding the plate gripper side, and an end portion 1b for holding the plate tail side, which is L-shaped in the plate tension rotation (counterclockwise) direction of the winding rod 2. When the gripping side 8a of the plate 8 is clamped by the inclined surface 7a of the long groove 7, it makes line contact at an acute angle. Further, the edge 1a for holding the plate edge side and the edge 1b for holding the plate edge side are set to have substantially the same protruding height.

Next, the procedure of plate mounting in this structure will be described with reference to FIG.
This will be described with reference to FIG. First, from the plate-uninserted state shown in FIG. 2A, the lever 17 is rotated clockwise by the air cylinder 18 in FIG. 3 to rotate the winding rod 2 as shown in FIG. Rotate in the plate loosening direction. In this state, the gripping side 8a of the plate 8 is inserted into the long groove 7 of the plate cylinder 6.

Therefore, as shown in FIG. 9 (a) of the conventional example, when the tip of the gripping side 8a of the plate 8 is applied to the R portion (curved portion) 6a on the bottom side of the plate cylinder 6 and is inserted into the long groove 7. On the holding side 8
a Tip end 21a for holding the plate gripping side of the retainer 21
Both ends 2 of retainer 21
The gripper side 8a of the plate 8 may be inserted between 1a and 21b. This is because the more the rotation (return) of the winding rod 2 in the plate loosening direction is insufficient (see the position of the retainer 21 shown by the chain double-dashed line in the figure), the more the above-mentioned trouble becomes. 2B of the present embodiment, unlike the conventional example, the end 1a for holding the plate gripping side of the retainer 1 does not enter the opening of the long groove 7, so that the gripping side 8a of the plate 8 is smooth. Can be inserted into the gripping side of the plate 8 and the end portion 1a for holding the plate holding side has a guiding action due to its bent shape.
a is brought into close contact with the gripping side of the plate cylinder 6 (the inclined surface 7a of the long groove 7).

After that, as shown in FIG. 2 (c), the winding rod 2 is returned to the original position and the gripping side 8a of the plate 8 is held by the spring force of the compression coil spring 11 for holding the plate gripping side of the retainer 1. The end portion 1a of the groove 1 holds a slanting pressure between the inclined surface 7a of the long groove 7. At this time, the edge 1a for holding the plate gripper side of the retainer 1
Has a line contact with the gripping side 8a of the plate 8 at an acute angle, so that the drawing load is increased.

In this state, the end of the bottom side 8b of the plate 8 is grasped, the plate cylinder 6 is rotated once so that the plate 8 is in close contact with the plate cylinder 6, and then the winding rod 2 is moved to the position shown in FIG. ) Rotate in the plate loosening direction. At this time, the edge 1a for holding the plate gripping side of the retainer 1 is retracted to the plate butt insertion position while only the edge 1b for holding the plate trailing side is held while holding the gripping side 8a of the plate 8.

Thereafter, the bottom side 8b of the plate 8 is inserted into the long groove 7, and then, as shown in FIG. 2 (e), the bottom side 8b of the plate 8 is pressed by a pressing pad (not shown),
When the plate is returned to its original position, the end 1b for holding the plate bottom side is placed on the bottom side 8 of the plate 8.
Engage with b in the plate tension direction. As a result, the plate 8 is tightly wound around the plate cylinder 6 together with the increase in the drawing load by the end 1a for holding the plate gripping side.

On the other hand, when separating (removing) the plate 8, it is obvious that the procedure reverse to the above-mentioned procedure may be carried out, and the explanation thereof will be omitted.

The case where the retainer 1 is replaced will be described. First, in the state shown in FIG.
Loosen the bolt of the split tightening part and take out the lever 17.
After that, a wrench or the like is applied to the hexagonal portion 9 to rotate the winding rod 2 further in the clockwise direction (plate loosening direction) than the position shown in FIG. Then, the end 1b side of the retainer 1 for holding the printing plate side is detached from the pin 4.

Thereafter, the retainer 1 to be replaced is taken out from the opening of the long groove 7 while being compressed with tweezers or the like, and then a new retainer 1 is similarly inserted into the cut groove 3 of the winding rod 2. When the winding rod 2 is returned to its original position (rotated in the plate tension direction by the spring force of the compression coil spring 11) after this insertion, the pin 14 is inserted into the pin hole of the retainer 1 again, and the retainer 1 is cut into the groove of the winding rod 2. Positioned within 3. Therefore, as shown in FIG.
As shown in FIG. 9B, when the retainer 21 is removed, the winding rod 2 is further rotated in the plate loosening direction from the state of FIG. 9A (to remove the pin 4). Since the tip of the end 21a for holding the plate gripping side of the retainer 21 abuts the inclined surface 7b of the long groove 7 early, the end 21a of the retainer 21 is deformed with the corner of the cut groove 3 of the winding rod 2 as a fulcrum. After that, sufficient holding force cannot be exerted when holding the gripper side 8a of the plate 8, but in FIG. 1 of the present embodiment, the plate gripper side holding end 1a and the plate tail side holding end 1a. 1
Since the protrusion height is set to be substantially the same as that of “a”, the end of the retainer 21 for holding the plate gripping side does not hit the inclined surface 7b of the long groove 7, and thus the end 1 of the retainer 1
It does not deform a.

In this way, the retainer 1 can be easily replaced by operating tweezers or the like, which is effective for maintenance.

FIG. 6 is a sectional view of a winding rod showing another embodiment of the present invention. This is the retainer 1 in the previous embodiment.
Is divided into two pieces, the end 1a side for holding the plate grip side and the end 1b side for holding the plate bottom side, and the respective base ends are connected to the side surface of the kerf 3 with bolts 20a, 20b. The same action and effect as those of the previous embodiment can be obtained.

[0025]

As described above, according to the present invention, the winding rod rotatably inserted into the long groove of the plate cylinder, and the grip and butt of the plate inserted into the cut groove of the winding rod. A retainer for holding the side, and an end portion for holding the plate gripping side of the retainer,
Since the end of the retainer for holding the plate bottom side is bent in the direction of the plate tension rotation of the winding rod, the end of the retainer for holding the plate edge of the retainer makes a sharp line contact with the edge of the plate and pulls in the plate. It is possible to obtain an effect that the load is increased and it is possible to prevent the occurrence of a print failure due to a so-called plate floating phenomenon or the like.

[Brief description of drawings]

FIG. 1 is a front sectional view of a main part of a plate cylinder showing an embodiment of the present apparatus.

FIG. 2 is likewise an operational state diagram of FIG.

FIG. 3 is a front view of the main part of the plate cylinder.

FIG. 4 is a front view of the plate cylinder in which the outer lever is also removed.

FIG. 5 is a side view of the main part of the plate cylinder, which is partially cut away.

FIG. 6 is a sectional view of a winding rod showing another embodiment of the present device.

FIG. 7 is a sectional view of a main part of a conventional plate cylinder.

FIG. 8 is a front view of the plate cylinder.

FIG. 9 is an explanatory diagram similarly showing a defect of the conventional example.

[Explanation of symbols]

 1 Retainer 1a Edge for holding plate edge side 1b Edge for holding plate edge side 2 Rolling rod 3 Cutting groove 4 Pin 6 Plate cylinder 7 Long groove 8 Plate 8a Plate holding side 8b Plate bottom side 9 Rolling rod shaft end Hexagonal part 10 Lever 11 Compression coil spring

Claims (1)

[Claims] 1. A winding rod rotatably inserted into a long groove of a plate cylinder, and a retainer inserted into a cut groove of the winding rod to hold a grip and a trailing side of the plate. A plate mounting structure for a rotary printing press, characterized in that an end of the retainer for holding the plate gripping side and an end of the retainer for holding the plate trailing side are bent in the plate tension rotation direction of the winding rod.