JPS5822172A - Plate fitting register for lithographic printer - Google Patents

Abstract

PURPOSE:To attach a lithographic plate to a plate drum while maintaining the accuracy of the plate when being formed by a plate bender by a method in which a pattern reference face is provided on the end face of the plate of a lithographic printer, and a pattern reference face is also provided on the end face of the plate drum to be wound around the plate. CONSTITUTION:When a plate 10 baked with a pattern is held by a plate bender, its hip ortion is bent into a desired shape, and then the plate 10 is wound around a plate drum 11, the pattern reference face A of the plate 10 is projectionally contacted with the reference face B of a register block 12 buried in the plate drum 11, the chucking head H of the plate 10 is inserted into the chucking head of the groove 13 of the drum 11, and the plate 10 is wound around the drum 11 by turning the drum 11 while firmly tensing the chucking hip T of the plate 10. When the winding is about to come to an end, the chucking hip T of the plate 10 is inserted into the roll-in shaft 14, the roll-in shaft 14 is turned by a tool, and the plate 10 is closely wound around the drum 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the positioning of a plate when attaching it to a plate cylinder in a lithographic printing press, and the plate and plate are placed in the [ff1t] position of the plate.
It is related to plate installation in a lithographic printing press that it is necessary to collect the plate after bending the plate while maintaining the relationship accurately, and to mount the plate on the plate cylinder in the same condition as the plate bender.

In order to attach the plate of a lithographic printing press to the plate cylinder, it is necessary to bend both ends of the plate, and the position and parallelism of the bending line with respect to the plate end face must be maintained accurately.

For this reason, in order to obtain precision when bending a plate with a plate bender, a score line is placed in the center of the pen base surface of the plate bender near the non-bending side edge, and the plate's register mark and the score line are It is tailored to When attaching a plate with both ends bent in this way to a plate cylinder, the positioning of the plate in the direction of the plate length is done by inserting the gripping head of the plate into the gripping head of the plate gripping gap of the plate cylinder, and then The plate cylinder was rotated while holding the butt of the plate, and the plate cylinder was rotated while holding and pulling the butt of the plate, and the plate was inserted into the plate gap of the molded plate cylinder, and then wrapped around the plate cylinder. At this time, the widthwise position of the plate was determined by aligning the marking line at the longitudinal center of the plate cylinder with the marking line at the center of the image printed on the plate.

Conventionally, a printing plate with a pattern printed on it is bent into the desired shape using a printing machine, and then attached to the printing cylinder using the marking lines on the printing plate and the printing cylinder as a reference line. When it is wrapped around a cylinder, both ends of the plate are analyzed and bent using a plate bender to form the required shape, so-called stenciling dimensions, and the shape to which the stenciled plate is attached (the dimensions of the plate cylinder) are measured. When this happens, it takes a long time to match the pattern to the flow of the web during printing, or to register each color in the case of multi-color printing, resulting in a large amount of wasted paper on the web during printing.

The present invention has been developed in consideration of these points, and provides a plate mounting registration device for a lithographic printing press that can be mounted on a plate cylinder while maintaining the accuracy when a plate is stamped with a plate bender. .

Hereinafter, details of the present invention will be explained with reference to the drawings. Fig. 1 is a developed view of the plate 10, in which the plate 10 or the end face of either the horizontal direction (left/right direction in Fig. 1), for example, the left end face in this example, are at the same distance from the pattern center X. Then, the same end surface is used as the pattern reference surface A when printing the image area, and the plate is printed.

- When the plate 10 is wound around the plate cylinder 11, as shown in FIG. A register block] 2 is embedded with a reference surface B that is used as a reference surface for mounting.

After the plate 10 with the image printed thereon is bent into a desired shape at the top and bottom of the plate using a plate bender (not shown), the VC is wound around the plate cylinder 1 shown in FIG. ] The pattern reference surface A of 0 is brought into contact with the reference surface B of the register block 12 buried in the plate cylinder 11K shown in FIG. ) is inserted into the groove 3 of the plate cylinder 11, and the plate 10 is wound around the plate cylinder 11 by rotating the plate cylinder 11 while applying tension L7 to the bite end T1 of the plate 10. When the winding is near the end, insert the winding shaft 14 shown in FIG. and wrap it around.

Figures 4 and 5 show plate 10a1 plate cylinder showing other embodiments.
In FIG. 4, which is a schematic diagram of lla, the reference surface A of the plate 10a is cut out. Therefore, in FIG. 5 as well, the register block 12a is embedded in the plate cylinder 11a, and the reference surface B of the register block 12a is convex.

As explained below, the present invention provides a pattern reference surface on the plate, which eliminates twisting when installing the plate, and greatly reduces paper waste when printing. The installation work when attaching to version B14 has become easier.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a plate showing an embodiment of the present invention, Fig. 2 is a schematic diagram of a plate cylinder showing an embodiment of the present invention, and Fig. 3 is a state in which the plate is mounted on the plate cylinder. 4 and 5 are schematic views showing other embodiments of the present invention. 10... Plate, 11... Plate cylinder, 12... Register block, 13... Groove, 14...
・Involvement axis 0 scorer Toshiba Shinki Co., Ltd.

Claims (1)

[Scope of Claims] 1. In a lithographic printing machine, a pattern reference surface is provided on the end surface of the plate when printing the image portion on the plate, and a reference surface that matches the pattern reference surface is provided on the end surface of the plate cylinder around which the plate is wound. 1. A plate mounting registration device for a lithographic printing press, characterized in that a plate mounting registration device for a lithographic printing press is provided with a surface to simplify the registration accuracy when mounting the plate. 2. Plate mounting registration device 0 for a lithographic printing press according to claim 1, wherein the reference surface of the plate cylinder is a register block embedded in the plate cylinder.