JPH01152064A - Plate cylinder for offset press - Google Patents

Abstract

PURPOSE:To shorten the period of time required for switching a printing plate and enable accurate positioning for mounting to be performed easily and assuredly, by connecting a base part inclusive of a rotary shaft and a plate-adhering part to each other in a body, after mounting the plate on the plate-adhering part of a plate cylinder having a cylindrical shape. CONSTITUTION:A plurality of plate adhering parts 8 of the same shape are prepared for a single base part 7. The base part 7 and the plate-adhering part 8 are coupled in a body by guiding and positioning them by, for example, guide pins 7a and guide holes 8a. The coupling of the base part 7 and the plate- adhering part 8 can be easily achieved by, for example, a quick operation type clamp means provided at an end face part, both end parts of the outer periphery or the like of a plate cylinder 1. When a plate 2 mounted on the plate-adhering part 8 coupled to the base part 7 in a body is to be replaced by another one, another plate 2 is preliminarily positioned and fixed on another plate-adhering part 8 which is separated, and replacement of the plate 2 together with the plate-adhering part 8 is conducted for the base part 7.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a plate cylinder of an offset printing apparatus that is frequently used for various printed materials.

(Prior Art) FIG. 2 is a simplified explanatory diagram showing a conventional offset printing apparatus.

In the figure, reference numeral 11 denotes a cylindrical plate cylinder on which a plate 2 is wound and adhered, and on the outer periphery of the plate cylinder 11, ink is uniformly spread from an ink reservoir (not shown) through a large number of roller rows 3. However, the final stage of the roller row 3 is deposited by the rollers, for example, by several μm.
It is designed to be applied uniformly to a thickness of 10-odd micrometers. Although the illustration is simplified, the ink transferred to a blanket cylinder, etc., which is provided as necessary and rotates synchronously with the plate cylinder 11, is set on a base 41, which is transferred in the direction of the arrow shown in the figure. It is designed to be printed on a printing material 5.

(Problems to be Solved by the Invention) By the way, in the above-mentioned conventional offset printing device,
The plate 11j411 is attached within the device in such a way that it cannot be simply removed. For this reason, when replacing the plate 2, the operation of the offset printing machine 4'l& is stopped and the plate 2 is wound and fixed around the plate cylinder 11.

However, the cylindrical plate cylinder 1 in an offset printing device
Attaching plate 2 to plate 1 is a very difficult task, and the mounting, positioning, and positioning accuracy is poor.
After attaching it to the plate, make a test print, adjust the position M8WI on the base 4 side of the printed side, and then print the plate 2 and substrate 5.
It is designed to align the
It took 40 minutes.

Therefore, when setting a new plate 2 on the plate cylinder, the above-mentioned trial time increases, the non-operation time of the offset printing device increases, and especially for lines that require high-mix, low-volume production, such as LCD color filters. In lines for producing items such as light-shielding masks, the increase in setup time has been a major problem in terms of productivity.

Therefore, the technical problem to be solved by the present invention is to solve the problems of the above-mentioned prior art, and its purpose is to:
To provide a plate cylinder for an offset printing device in which the plate changeover time can be shortened and the plate can be attached to the plate cylinder with easy and reliable positional accuracy.

(Means for Solving the Problems) The above-mentioned object of the present invention is to divide a cylindrical plate cylinder into a base part including a rotating shaft and a plate adhering part that is detachably attached to the base part, This is achieved by attaching the plate to the plate sticking part and then coupling and integrating the base part and the plate sticking part.

<Function> As described above, if the plate cylinder is divided into the base part and the plate adhesion part, by preparing several plate adhesion parts for the base part, it is possible to Another plate can be attached to the plate attachment part offline. Moreover, since the plate can be attached off-line outside the offset printing apparatus, the plate can be accurately positioned in the plate-attached area using a length measuring device or the like. Therefore, the plate can be changed simply by replacing the plate attachment part to the base part of the plate cylinder, and the desired positional accuracy between the plate and the substrate can be maintained, making it possible to stop the operation of the offset printing device. The time required for version changeover is greatly reduced.

(Example) The present invention will be explained below using an example shown in FIG. In this figure, the same members as those in the conventional example are given the same reference numerals, and their explanations will be omitted to avoid duplication.

In FIG. 1, a cylindrical plate cylinder generally indicated by the reference numeral 1 includes a rotating shaft 6 and is attached to and detachable from a base portion 7 that is difficult to remove within the device. It is equipped with a plate sticking part 8.

A plurality of plate sticking parts 8 having the same shape are prepared for the base part 7, and both 7.8 are, for example, guide pins 7a.
and guide holes 8a, and are connected and integrated by appropriate means. The means for connecting the base portion 7 and the plate adhering portion 8 is provided at an end face portion of the plate cylinder 1 or at both outer circumferential end portions of the plate cylinder 1, and can be easily achieved by a known one-touch clamping means or the like.

Since the configuration of this embodiment is as described above, if it becomes necessary to replace the plate 2 of the plate attachment part 8, which is currently integrated with the base part 7, with a separate one, it can be separated. A separate plate 2 is positioned and fixed in advance to another plate-attached portion 8, and the plate 2 and the plate-attached portion 8 are replaced with respect to the base portion 7. That is, outside the offset printing line, the next necessary plate 2 is accurately positioned and fixed to the other plate attachment part 8, which has been separated separately in advance, using a length measuring device, etc. By simply replacing the other plate sticking part 8 to which the plate 2 has been pasted with the plate sticking part currently in use, the new plate 2 can be accurately positioned with respect to the base part 7, in other words, to the substrate 5. , mounting allows plate switching without subsequent relative positioning of the plate 2 and printing substrate 5.

As mentioned above, it is relatively easy to attach the plate 2 to the plate attachment part 8 off-line due to the work space and the ease of measuring and attaching the jig. Since positioning is possible and can be done while the offset printing device is in operation, the actual work of replacing the plate 2 is to maintain only the alignment accuracy between the base portion 7 and the plate-attached portion 8. If this is done, replacing the plate sticking portion 8 will only take a few minutes, and the plate switching setup work can be significantly shortened.

<Effects of the Invention> As described above, according to the present invention, the plate replacement time can be significantly shortened, and this contributes to improved productivity, especially in offset printing machines that require high-mix, low-volume production. It's large.

[Brief explanation of the drawing]

1M is a simplified explanatory diagram of an offset printing apparatus according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a conventional example. １・・・・・・・・・Plate cylinder, ２・・・・・・・・・Plate,
3・・・・・・・・・Roller row, 4・・・・・・・・・
Base, 5... Printing material, 6...
...Rotation axis, 7...Base part, 8.
・・・・・・・・・Plate pasting part. Figure 1 Figure 2

Claims (1)

[Claims] A cylindrical plate cylinder is divided into a base part including a rotating shaft and a plate attachment part that is detachably attached to the base part. After attaching a plate to this plate attachment part, the base part and the plate attachment part are separated. A plate cylinder for an offset printing device, characterized in that the plate cylinder is combined and integrated with a printing part.