JPH02304571A - Method and device for producing machine plate - Google Patents

Abstract

PURPOSE:To shorten the work process by exposing an alignment mark corresponding to a film negative by an exposure head. CONSTITUTION:An alignment mark film 39 is provided with only one alignment mark 5, and a PS plate 3 and the alignment mark film 39 are set to positional relations of the alignment mark 5 corresponding to a positive film 8 by a controller 43. Based on information in a ROM and a RAM and input information, the controller 43 performs the control of this setting and all of the control for device operation. That is, the extent of movement of a supply pallet 41 of the alignment mark film 39 is controlled based on position data, and the holding position of an exposure head 23 is changed to move the position of the exposure head 23 to the PS plate, and the extent of movement of a surface plate 13 is controlled. Thus, it is unnecessary to print the alignment mark by another printer, and the work to erase the alignment mark is eliminated to shorten the work process.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing a printing plate used in offset printing and an apparatus for producing the printing plate.

[Prior Art] In conventional offset printing, as shown in FIGS. 6 and 7, for example, Y (yellow) plate, M (red) plate, C (Ii
) and K (black) plates are produced, and each plate 3 is wrapped around the plate cylinder 1, which is the uppermost roll in the diagram of the units Y, M, C, and K arranged side by side. Each color is printed continuously in each unit Y, M% C1K. PS, which is a pre-sensitized plate
At least two location holes 4 are formed in the pre-sensitized plate 3,
A printing plate 3 having a location hole 4 is formed, and this printing plate 3 is attached to a locate pin (not shown) provided on the plate cylinder l.
is positioned and wrapped.

By the way, the registration marks 5 formed on the PS plate 3 shown in FIG. 7 are obtained by photographing the registration marks 5 provided on the registration mark film 6 shown in FIG. 8 in advance using another printing machine. For example, from the top, 5a for Y version, 5b for M version,
5c for C version and 5d for K version. For example, a positive film 8 for a Y-plate having an image information (including characters) part on a PS plate 3 on which a registration mark 5 is printed.
(See Figure 9) to capture the image information section for the Y version, and then
The printing plate 3 shown in the figure has been formed (2 plates), and the marks 5b, 5c, 5d, etc. are erased, leaving the topmost one in the figure, which is the registration mark 5a for the Y plate. The printing plate for the Y version was completed. M, C, K
Other versions are produced in the same way.

Therefore, each printing plate 3 produced in this manner is set as shown in FIG. 6 and printed. As a result of this printing, images of each color of Y, M, C, and K of each printing plate 3 and registration marks 5 are printed as shown in No. 1011. FIG. 10 shows a part of the printing section, and the printed matter 10
0 G,: Image information section 71.72 tY, M%G,
Registration marks 5 printed by each K version
゜a, 50b, 50c, and 50d are printed. At this time, there are cases where the color lines in the image information sections 71 and 72 are misaligned, resulting in an unfinished image. As a result of such trial printing, if the registration marks 50b are misaligned or the intervals are not aligned as shown in Fig. 10 (here, the abnormality is in the M plate), the unit Y, M, C, etc. The torsion angle of the M roll is
By adjusting the rotation angle, etc., the registration marks 5o are aligned in a predetermined positional relationship, so that correct printing can be performed.

[Problems to be Solved by the Invention] However, conventional printing of registration marks is
M, C, and K were all printed together in advance using a separate printing device, and it was necessary to erase unnecessary registration marks after completing printing of the original film such as positive film. Therefore, during the erasing process, the correct registration mark may be erased by mistake, the registration mark itself may be partially lost due to bleeding, or the image of the image to be printed may be rounded off. You may end up burning it out. In such a case,
Since the registration marks cannot be positioned properly and the printing is not overwhelming, these plates have to be rejected and remanufactured. The cost is high.

Therefore, the present invention aims to solve these problems.

[Means for Solving the Problems] In order to achieve this object, the present invention uses a registration mark film having registration marks to place a registration mark on a PS plate at a position corresponding to the film master and the film master. In addition, the registration mark film is positioned and exposed in the positional relationship of the registration marks corresponding to the film master plate of each plate, and is exposed to a plurality of predetermined relationships. I am trying to produce a certain printing plate.

[Example] ' The present invention will be explained below based on the drawings. Figure 1-1
Figure 0 shows an embodiment according to the present invention, and in the figure,
The same reference numerals are given to parts and members that are the same as or equivalent to those of the conventional art, and redundant explanation will be omitted.

FIG. 1 is a block diagram of a printing plate manufacturing apparatus according to the present invention. In FIG. 0, reference numeral 11 is a pedestal, and the pedestal 11 has a surface plate 13 in the longitudinal center thereof so as to be movable in the longitudinal direction of the pedestal 11. On the bottom of the surface plate 13, there are PS plates 3 classified into various sizes.
are positioned in the location hole 4 by a locate pin (not shown), and are stacked in the stacker 15, respectively. This stacker 15 is movable in the longitudinal direction of the base 11, and is opened at the top when pulled out toward the front in the figure.

The PS plate supply/discharge device 17 is movable in a direction perpendicular to the longitudinal direction of the pedestal 11 and in a vertical direction, and is provided with a suction cup 19 on its lower surface that holds the PS plate 3 by suction using, for example, air.

Further, the exposure device 21 is roughly as shown in FIG.
Like the S plate supply/discharge device 17, it is movable in the direction perpendicular to the pedestal 11. The exposure head 23 of the exposure device 21 emits light [
25 and a frame-shaped holder 27 as shown in FIG. 3, and is vertically movable. Therefore, the exposure head 23 is positioned vertically and vertically relative to the pedestal 11.
It is also movable in a direction perpendicular to the longitudinal direction of the 1. The lower surface of the holder 27 is provided with first air intake holes 29 aligned on the inside and second air intake holes 31 provided on the outside, here at the four corners, and further surrounded by a shield member 33 made of rubber or the like. are provided consecutively. Further, an automatic masking device 34 is provided below this holder 27, and a negative film may be used with a mask (not shown) if necessary, but here, a positive film 8 or a registration mark film 39 is exposed to a 25-plate image. It is shaded when doing so.

A positive film 8 is stored below the exposure head 23, and includes a pallet 35 for supplying the exposure head 23, a pallet 37 for receiving the positive film 8 discharged from the exposure head 23, and a registration mark film 39. (See FIG. 4) are housed in pallets 41 that are independently movable in a direction orthogonal to the base 11. Locating pins (not shown) are provided in each pallet A, C, 41, and location holes 8a, 39a of the positive film 8 and the registration mark film 39 are provided in the respective pallets A, C, 41.
are inserted and engaged and positioned. Pallet field, 4
1 and the exposure device 21 are entirely movable in the longitudinal direction of the pedestal 11, and as a result, the exposure head 23 can be moved in the longitudinal direction of the pedestal 11 and in the transversal direction, and can be set at any position on the plane. can do.

The registration mark film 39 is, as shown in FIG.
Only one registration mark 5 is provided, which is different from the conventional example in which a plurality of registration marks are provided as shown in FIG.

Reference numeral 43 denotes a control device, which is provided to automatically control the movement of each part of the device, and controls the positional relationship between the PS plate 3 and the registration mark film 39 with respect to the registration mark 5 corresponding to the positive film 8. This includes a CPU, ROM, and RAM, as well as input means such as a keyboard. And ROM, RA
control to set the PS plate 3 and the registration mark film 39 in the positional relationship of the registration mark 5 corresponding to the positive film 8 based on the information of M and the input information;
All controls for operating this printing plate manufacturing device are performed by the control device 43. In other words, the RAM and ROM store data on the position of the printing mark, which is predetermined based on the size of the PS plate and the color separation of the film original plate. The position of the registration mark film 39 with respect to the PS plate 3 is controlled based on the position data stored in the RAM or ROM from the size information and color separation information of the 25th plate inputted from the keyboard.

Specifically, this control includes controlling the amount of movement of the supply pallet 41 for the registration mark film 39 based on the position data, changing the holding position of the exposure head 23, and controlling the movement of the exposure head 23 for the 25th plate. and control the amount of movement of the surface plate 13.

Next, an example of such control will be explained with reference to a flowchart shown in FIG.

First, in step 101, the stacker 15 containing PS plates 3 of the specified size is pulled out on the pedestal 11 toward the front in FIG. , further lowered, and the PS plate 3 is sucked by the suction cup 19, and then raised.

After that, the surface plate 13 is moved to the lower side of the 25th plate supply/discharge device 17, and the PS plate supply/discharge device l117 is moved so that the location hole 4 is engaged with the locating pin (not shown) on the surface plate 13.
, release the suction force of the suction cup 19, and remove the PS version 3.
is set on the surface plate 13.

In step 102, for example, Y, M,
C.

A pallet 35 containing positive films 8 inserted into locating pins (not shown) and arranged in the order of each plate of K is moved below the exposure device 21, the exposure head 23 is lowered onto the pallet 35, and the positive films are 8 is suctioned to the holder 27 by the first suction hole 29 as shown by the two-dot chain line in FIG. 3, and the pallet 35 returns.

In step 103, the positive film 8 and P on the surface plate 13 are
The exposure head 23 is moved so that it is in a predetermined positional relationship with the S plate 3.

In step 104, a mask (in this case, the automatic masking device 34) is set so as to cover the area other than the area requiring exposure.

In step 105, the exposure head 23 is lowered onto the surface plate 13, the shield member 33 is brought into close contact with it, and the air surrounded by the shield member 33 is suctioned and removed from the second suction hole 31, and the positive film 8 is removed. Automatic mask device 34 and PS version 3
and the surface plate 13 are vacuum-adhered so that they are completely in contact with each other.

In step 106, the light source 25 is turned on and exposed for a predetermined time.

Step 10? Then, the suction of the suction hole 31 is stopped, the vacuum contact is released, and the exposure head 23 is raised from above the surface plate 13.

In step 10B, automatic masking device 34 is removed.

At step 109, the pallet 37 that receives the positive film 8 is moved to the lower side of the exposure head 23, the suction of the suction hole 29 is stopped, the vacuum adhesion is released, the positive film 8 is received on the pallet 37, and the pallet 37 is moved to the lower side of the exposure head 23. Restore 37.

In step 110, it is determined whether there is multiple exposure and if there is multiple exposure, the process moves to step 102, and the same process is repeated for the next positive film 8 in the pallet 35. If there is no multiple exposure, step 111 Move to.

In step 111, the pallet 41 in which the registration mark film 39 is positioned with its location hole 39a is moved below the exposure head 23, the exposure head 23 is lowered onto the pallet 41, and the registration mark film 39 is positioned by the location hole 39a. The film 39 is attached to the holder 27 using the first suction hole 29.
The pallet 41 returns to its original position.

In step 112, the exposure head 23 is moved so that the registration mark film 39 and the 25 plate 3 on the surface plate 13 are in a predetermined positional relationship. As means for moving to this predetermined positional relationship, the exposure head 2 of the conversion pallet 41 in this example is used.
There is an example in which the amount of movement to 3 is adjusted, and an example in which the amount of feed of the pallet 41 is kept constant, the exposure head 23 is moved, and the suction position of the registration mark film 39 to the holder 27 is adjusted.

In step 113, the automatic masking device 34 is set so as to cover the image information portion of the positive film 8.

In step 114, the exposure head 23 is lowered onto the surface plate 13, the shield member 33 is brought into close contact with the shield member 33, and the air surrounded by the shield member 33 is suctioned and removed from the second suction hole 31 to form the registration mark film. 39 and automatic mask device 11
34, the PS plate, and the surface plate 13 are vacuum-adhered so that they are completely in contact with each other.

In step 115, the light source 25 is turned on and exposed for a predetermined time.

In step 116, the suction of the suction hole 31 is stopped, the vacuum contact is released, and the exposure head 23 is raised from above the surface plate 13.

In step 117, automatic masking device 34 is removed.

In step 118, the pallet 41 that receives the registration mark film 39 is moved to the lower side of the exposure head 23,
The suction of the suction hole 29 is stopped, the vacuum adhesion is released, the registration mark film 39 is received on the pallet 41, and the pallet 41 is returned to its original position. At this time, the registration mark film 39 is positioned on the pallet 41 by the location hole 39a.

In step 119, the surface plate 13 is moved to the lower side of the PS plate supply/discharge device 17, the PS plate supply/discharge device 17 is lowered, and the exposed PS plate is sucked by the suction cup 19 and discharged to a predetermined position. do.

A printing plate can be manufactured by subjecting the PS plate 13 discharged in this manner to a development process and the like.

[Effects of the Invention] As explained above, according to the method and apparatus of the present invention, there is no need to burn the registration marks using a separate printing device, and there is no need to erase the registration marks. Man-hours are reduced. Furthermore, since the registration mark itself is not damaged or rounded, it is possible to eliminate plate defects, achieve accurate registration, and print with a beautiful finish.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view showing an embodiment of the printing plate manufacturing apparatus according to the present invention, FIG. 2 is a schematic explanatory view showing the positional relationship between the exposure device and the surface plate, and FIG. 3 is a diagram showing the holder of the exposure head. FIG. 4 is a plan view of the registration mark film, FIG. 5 is a flowchart, FIG. 6 is an explanatory diagram of offset printing, FIG. 7 is a plan view of the exposed PS plate, and FIG. FIG. 8 is a plan view of the registration mark film, FIG. 9 is a plan view of the poly film, and FIG. 10 is a state diagram showing an example of poor registration when trial printing is performed using a completed printing plate. 3...PS version, 4...location hole, 5...registration mark, 7...image information section, 8...positive film, 8a...location hole, 11...pedestal , 13... Surface plate, 15... Stacker, 17... PS plate supply/discharge device, 23... Exposure head, 27... Holder, 2
9... First suction hole, 31... Second suction hole, 33... Shield member, 34... Automatic mask device, 35.37.41... Pallet, 39... Register Registration mark film, 39a... Location hole, 50... Registration mark, 71.72... Image information section, 100... Printed matter. Figure 4 Figure 5 Figure 6 CMY Figure 7 Figure 8 '3Cbd Figure 9 Figure 10

Claims (10)

[Claims] (1) Set the PS plate and the film original plate with the image information part in a predetermined positional relationship, block the parts other than the exposed areas with a mask, expose with the exposure head, and remove the film original plate and the mask. After that, the exposed portion is shielded from light with another mask, and the PS plate and a registration mark film having registration marks are set in the positional relationship of the registration marks corresponding to the film original plate, A method for producing a printing plate, characterized in that the exposure head exposes registration marks corresponding to the film original plate. (2) In claim (1), the film original plate is for Y plate,
The registration mark film is for either the M plate, the C plate, or the K plate, and the registration mark film is exposed to each PS plate with the position of the registration mark in a predetermined positional relationship with respect to the film original plate for each plate. A printing plate production method characterized by: (3) The printing plate production according to claim (2), characterized in that the registration mark positions exposed on each PS plate are arranged in a straight line at equal intervals when printed. Method. (4) In claim (1), the registration mark film is provided with at least two location holes, and at least two location holes are engaged with the location holes at the supply position and the discharge position of the registration mark film. A printing plate production method characterized in that positioning is performed by providing locating pins. (5) A surface plate for setting the PS plate, a film original supply/discharge means for supplying and discharging the film master having an image information section, and a registration mark for supplying and discharging the registration mark film having the registration mark. a film supply/discharge means; a mask means for shielding light when exposing using the film master and the registration mark film; a registration mark setting means for setting a PS plate in a predetermined positional relationship; and holding the registration mark film or the film original plate positioned by the registration mark setting means, and shielding the film from light with the mask means. A printing plate production device consisting of an exposure head that exposes and prints onto a PS plate. (6) The printing apparatus according to claim (5), wherein the registration mark setting means sets the registration mark position by changing the supply position of the registration mark film to the exposure head. Plate making equipment. (7) The printing apparatus according to claim (5), wherein the registration mark setting means sets the registration mark position by changing the holding position of the registration mark film on the exposure head. Plate making equipment. (8) The printing plate production according to claim (5), wherein the registration mark setting means sets the registration mark position by changing the movement position of the exposure head onto the PS plate. Device. (9) The printing plate production according to claim (5), characterized in that the registration mark setting means sets the registration mark position by changing the movement position of the surface plate below the exposure head. Device. (10) In claim (5), claims (6) to (9)
1. A printing plate production device, characterized in that the registration mark position is set by a combination of at least two of the above.