JPH04355454A - How to print registration marks on printing plates - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved method of printing registration marks on printing plates.

0002

2. Description of the Related Art Conventionally, in offset printing and the like, so-called register marks for specifying the position are displayed on the printing plate to prevent misalignment on the printing press. Furthermore, in recent years, offset printing presses have begun to print so-called register marks on each printing plate in order to prevent misalignment of patterns in each color when performing multicolor printing. In order to print this register mark, conventionally, as shown in FIGS. 3 and 4, for example, a printing plate is supported at a predetermined location on the printing plate support part 2 of the printing apparatus main body 1, and then a predetermined position on the printing plate is A method is practiced in which a movable head 3, which is configured to be movable in the X-Y axis directions, is moved to the location, and then a register mark is displayed using a pen supported by the movable head 3. In addition, the register marks are 1, 1, and 1, as shown in Figure 4.
A method is used to display marks for red, blue, yellow, black, etc. inside a 5 mm square area.

0003

[Problems to be Solved by the Invention] According to the above-mentioned structure, in order to create the printing plate 3 for multicolor printing, when displaying the register mark for red among the displayed register marks, it is necessary to display the register mark for the other register marks such as blue, yellow, and black. The disadvantage of this is that the operator must erase register marks while enlarging them with a magnifying glass, which requires a considerable amount of work.

The present invention was devised in view of the above points, and it is an object of the present invention to accurately display register marks and register marks at predetermined locations, and to easily print and display register marks for each color even in multicolor printing. The purpose of the present invention is to provide a method for printing registration marks on a printing plate.

[0005]

[Means for Solving the Problems] In order to solve the above problems, the present invention employs the following method. That is, first, the printing plate is positioned at a predetermined location on the printing plate support using the movable arms at both ends of the printing device main body. Next, the movable head is moved to a predetermined location in the X-Y axis direction, and a registration mark is displayed at a predetermined location on the printing plate using a pen provided on the movable head. After this, a register mark is printed and displayed on each printing plate using a register mark display body which is separated into a plurality of parts and is supported by a movable head.

[0006]

[Operation] According to the above-described method of printing registration marks on a printing plate, the printing plate can be accurately supported at a predetermined location on the printing plate support, so that registration marks and register marks can be displayed accurately at the predetermined locations. can do. In addition, the disassembled register marks are displayed for each color printing plate provided on the movable head, so there is no need to erase register marks other than the designated colors even when printing in multiple colors, making it easy to print register marks. can be displayed

0
007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of printing registration marks on a printing plate according to the present invention will be explained below with reference to FIGS. 1 and 2. (a) First, the printing plate is positioned at a predetermined location on the printing plate support portion 13 using the movable arms 12 at both ends of the printing device main body 11. The printing plate support section 13 used in this method is, for example, 1150 mm long and 1410 mm wide. Furthermore, the movable arm 12 is configured to move horizontally from both ends toward the center.

(b) Next, the movable head 14, which is configured to be movable in the X-Y axis directions, is moved to a predetermined location on the printing plate. The registration mark is displayed using the pen 15. To display the registration marks here, remember the size of the printing plate in your computer.
Display at a designated location. Move to.

(c) After this, the register mark display body 16 is disassembled into a plurality of pieces and supported on the movable head 14.
A register mark is printed and displayed on each printing plate. here,
To print and display the register mark, move the movable head 1.
4 is provided with an optical fiber 17, and the same optical fiber 1 is further provided with an optical fiber 17.
A register mark display board which is separated into a plurality of parts is provided adjacent to the register mark display board 7, and is exposed to light using the fiber 17 at predetermined color locations such as red, blue, yellow, black, etc., and is printed and displayed. For example, a 200 watt ultra-high pressure discharge lamp is used as the light source. For the register mark, the size of the printing plate and a predetermined color such as red, blue, yellow, black, etc. are stored in the computer and selected and displayed at a predetermined location.

0010

Effects of the Invention As described above, the present invention positions a printing plate at a predetermined location on the printing plate support using a movable arm, and then marks a registration mark at a predetermined location on the printing plate using a pen provided on a movable head. This method prints and displays the register mark on each printing plate using a register mark display body that is separated into multiple pieces, so the printing plate is accurately supported at a predetermined location on the printing plate support, and the registration mark and Register marks can be accurately displayed at predetermined locations. Furthermore, even in multi-color printing, there is no need to erase register marks of colors other than those specified, and the unique effect is that register marks can be easily printed and displayed.

[Brief explanation of the drawing]

FIG. 1 is an external view of an apparatus used in the method of printing registration marks on printing plates of the present invention.

FIG. 2 is a perspective view of the movable head of FIG. 1;

FIG. 3 is an external view of an apparatus used in a conventional method for printing registration marks on printing plates.

FIG. 4 is a partially enlarged view of the register mark in FIG. 2;

[Explanation of symbols]

11　Printing device main body 12 Movable arm 13 Printing plate support part 14 Movable head 15 Pen 16 Register mark display 17 Optical fiber

Claims (1)

[Claims] Claim 1: First, the printing plate is positioned at a predetermined location on the printing plate support section using the movable arms at both ends of the printing device main body, and then the movable head is moved to a predetermined location in the X-Y axis direction, and the printing plate Display a registration mark at a predetermined location using a pen attached to a movable head.
Next, a method for printing registration marks on a printing plate, characterized in that a register mark is printed and displayed on each printing plate using a register mark display body which is supported by a movable head and is divided into a plurality of pieces.