JP2001213061A - Printing machine plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machine plate, which can be highly accurately mounted onto a plate cylinder. SOLUTION: Three positioning pinholes 2a, 2b and 2c are formed at equal intervals along the width direction of a form plate 1 at the gripping side edge part of the form plate. The middle pinhole 2b is an elongated hole elongated towards the longitudinal direction of the form plate 1. The two side holes 2a and 2c are slot holes elongated towards the width direction of the form plate 1. These pinholes 2a, 2b and 2c consisting of the slot holes absorb the mounting errors of three positioning pins provided on a plate cylinder. The machine plate is positioned horizontally through the engagement between the middle pinhole 2b and the positioning pin and is positioned vertically through both the side pinholes 2a and 2c and the positioning pins.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing plate mounted on the outer periphery of a plate cylinder of a printing press.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a plate cylinder of a printing press. The plate cylinder 10 is provided with an opening 11 extending in the axial direction. A claw base 12 is attached to one end of the opening 11 that is opposed in the circumferential direction. A plurality of positioning pins 13 are provided on the claw base 12 at equal intervals in the length direction of the claw base 12. The positioning pin 13 is formed of a round pin, and has a conical tip.

A claw shaft 14 and a hook shaft 15 are provided in the opening 11 so as to be rotatable, respectively.
A hook 16 is attached to the hook shaft 15, while a plurality of hooks 17 are attached to the hook shaft 15.

As a printing plate set on the plate cylinder 10,
The one shown in FIG. 4 is conventionally known. This printing plate A
₁ , a plurality of positioning pin holes 22 into which the positioning pins 13 are inserted are formed at an edge of a plate 21 on which a design is baked, and the hook 1
7 are provided with a plurality of engagement holes 23 to be engaged.

[0005] Mounting of the plate A ₁ is a Tsumejiku 14 After fitting the pin holes 22 of the leading edge to the positioning pins 13 provided on the plate cylinder 10 is rotated in the arrow direction, the grippers 16 to clamping the leading edge of the plate a ₁ at the tip and gripper pad 12. After the clamping, winding the printing plate A ₁ on its outer periphery by rotating the plate cylinder 10, engagement holes 23 provided on the trailing edge of FIG. 3 the hook shaft 15 in a state to be fitted to the hook 17 It is rotated in the arrow direction, so that tightening the plate a ₁ by a hook 17 which engages with the engaging hole 23.

Here, in the plate cylinder 10 shown in FIG.
Since the vertical adjustment of the outer wound on the printing plate A _1, has no adjusting mechanism for lateral adjustment and tilt adjustment, the plate cylinder 10
Is simple in configuration. But,
Mounting of the plate A ₁ because there is no adjustment mechanism, the precision is high mounting request for mounting the printing plate A ₁ especially printing a multi-color.

[0007]

[SUMMARY OF THE INVENTION Incidentally, in the conventional plate A _1, the pin holes 22 for positioning formed on the leading edge since consisting of round holes, provided on gripper pad 12 If there is a mounting error in the positioning pin 13, the error cannot be absorbed.
The printing plate A ₁ attached to 0 occur circumferential direction and lateral direction positional shift, it is impossible to mount the printing plate A ₁ with high accuracy.

An object of the present invention is to provide a printing plate which can be mounted with high accuracy on a plate cylinder provided with positioning pins on a claw base.

[0009]

In order to solve the above-mentioned problems, according to the present invention, a plurality of positioning pins provided on a plate cylinder are inserted into an edge of a plate on which a pattern is printed. In a printing plate in which a plurality of positioning pin holes are provided at intervals in the width direction of the printing plate, the number of the pin holes is three, and the pin hole located at the center is a long hole in the printing plate length direction. In this configuration, the pin holes on both sides were elongated in the width direction of the printing plate.

In mounting the printing plate having the above structure, the plate cylinder is provided with a claw mounted on one end of the opening.
A positioning pin composed of a round pin is provided, and three pin holes formed at the edge of the printing plate are fitted into the positioning pin to position the printing plate.

Here, since the pin holes provided on both sides of the plate are elongated holes in the width direction of the plate, the pin arrangement direction is set at the mounting position of the plurality of positioning pins provided on the claw base. If there is a mounting error, the mounting error can be absorbed by the pin holes on both sides.

Further, since the pin hole provided at the center of the printing plate is a long hole extending in the length direction of the plate, the center positioning pin provided on the claw base and the mounting positions of the positioning pins on both sides are provided. If there is a mounting error in the length direction of the printing plate, the mounting error can be absorbed by the central pin hole.

For this reason, the printing plate is positioned in the left and right direction by the positioning pins at the center, and is positioned in the vertical direction by the positioning pins at both sides.
The printing plate can be mounted with extremely high precision.

Here, the printing plate may be a paper plate or an aluminum plate.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As illustrated, the plate A ₀ has a printing plate 1 symbol has been baked, the printing plate 1
Three pin holes 2a, 2b, and 2c are formed at equal distances in the width direction of the plate 1 at the edge of the holding side. Of the three pin holes 2a, 2b, 2c, the center pin hole 2b is a long hole that is long in the length direction of the plate 1, while the pin holes 2a,
2c is a long hole elongated in the width direction of the plate 1. The width dimension of each pin hole 2a, 2b, 2c is set to a size that the positioning pin 13 shown in FIG. 3 fits exactly.

A plurality of engaging holes 3 with which hooks 17 shown in FIG.

Here, the printing plate A may be a paper plate or an aluminum plate.

Printing plate A shown in the embodiment₀Is the above structure
The printing plate A₀At the time of mounting, shown in FIG.
Three positioning pins 13 are equidistantly arranged on the claw rest 12 of the plate cylinder 10
And the positioning pin 13 has a pin hole 2a,
Printing plate A by fitting 2b and 2c ₀Position.

At this time, the three pin holes 2a, 2b, 2c
Of these, the pin holes 2a and 2c located on both sides are long holes long in the width direction of the plate 1, so that the pin holes 2a and 2c are mounted in the mounting direction of the three positioning pins 13 provided on the claw base 12 in the arrangement direction of the pins. If there is an error, the error is determined by the pin holes 2a, 2a on both sides.
is absorbed by c, the plate A ₀ by the engagement of the sides of the pin hole 2a, 2c and the positioning pins 13 are positioned in the vertical direction.

The center pin hole 2b of the three pin holes 2a, 2b, 2c is a long hole extending in the length direction of the printing plate 1, so that the positioning pins 13 on both sides of the three positioning pins 13 are provided. If there is a length direction of the mounting error of the plate a ₀ to the attachment position of the positioning pin 13 between each other in the center of the positioning pin 13, the center of the pin hole 2b will absorb the mounting error, the pin of the central The plate _A0 is positioned in the left-right direction by the engagement between the holes 2b and the positioning pins 13.

[0021] Therefore, after the positioning of the leading edge of the plate A _0, wound on the outer circumference of the plate cylinder 10 and the printing plate A _0, the hook 17 with the engaging hole 3 formed on the trailing edge By engaging and rotating the hook shaft 15 in the tightening direction, the plate cylinder 1 is rotated.
Plate A ₀ on the outer periphery of the 0 can be attached very accurately.

[0022]

As described above, according to the present invention, three pin holes for positioning are formed at the edge of the printing plate on the grip side, and the central pin hole is a long hole extending in the length direction of the printing plate. Since the pin holes on both sides are elongated in the width direction of the printing plate, if there are errors in the mounting positions of the three positioning pins provided on the plate cylinder side, the mounting errors are absorbed and the pin holes are absorbed. By using the positioning pins inserted into the plate, the grip side end of the plate can be positioned with high precision, and the plate can be mounted on the plate cylinder with extremely high precision.

[Brief description of the drawings]

FIG. 1 is a front view of a printing plate according to an embodiment of the present invention with a part thereof omitted.

FIG. 2 is a front view showing a pin hole formed at a grip side end of the printing plate shown in FIG. 1;

FIG. 3 is a longitudinal sectional front view showing a plate cylinder of the printing press.

FIG. 4 is a front view showing a conventional printing plate.

[Explanation of symbols]

 1 plate 2a, 2b, 2c pin hole

Claims (1)

[Claims] 1. A plurality of positioning pin holes, into which a plurality of positioning pins provided on a plate cylinder are inserted, are provided at intervals in a width direction of the plate at an edge portion on a grip side of the plate on which the pattern is baked. In the printing plate, the number of the pin holes is three, and the pin hole located at the center is a long hole long in the length direction of the printing plate,
A printing plate for printing, characterized in that the pin holes on both sides are elongated holes in the width direction of the plate.