JPH08224857A - Forming method for press plate having punched holes for setting to press - Google Patents

Abstract

PURPOSE: To form punched holes for setting a press plate to a press at certain fixed positions to a pattern at all times. CONSTITUTION: A right and a left register marks 12 and 12', which are printed together with a pattern 11 on a press plate 1, are detected with CCD cameras 6 and 6' so as to move the press plate 1 in order to position the register marks 12 and 12' on a horizontal line. Next, the middle line P-P between the register marks 12 and 12' coincides with the middle line O-O between a punch presses 4 and 4' by moving the press plate 1,. At the position of the press plate 1 as just mentioned above, the press plate 1 is fixed to a table 2 and, by actuating the punch presses 4 and 4', a pair of U-shaped punched holes are formed at the lower edge (the gripper margin to a press) of the press plate 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a printing plate provided with punched holes so that the printing plate can be properly set in a printing machine, and particularly, in the case of performing multicolor printing on both sides. The present invention relates to a method for producing a printing plate having punch holes for setting on a printing machine, which is suitable for printing.

[0002]

2. Description of the Related Art When performing multicolor printing, a printing plate for at least four colors of red, indigo, black and yellow is used. These printing plates are sequentially set on a multicolor printing machine and overprinted with each color ink. In that case, if the position of the design of the printing plate set in the printing machine is shifted even a little, the printed matter obtained will be a color shift. Therefore, conventionally, it has been necessary to repeat test printing before actual printing to align the positions of the patterns on each printing plate.

For this reason, a pair of U-shaped punch holes are formed at a fixed position on one side (holding side) of each plate with respect to the design, and each plate is utilized by utilizing the punch holes. What was set in a printing machine was developed by the present applicants (Japanese Patent Publication No. 7-78633) and put to practical use. In itself, the plate is first placed on a plate support table and centered on the table. Then, one of the left and right register marks that is printed on the printing plate together with the pattern, for example, the left register mark is detected, and the position of the register mark is stored. Next, the right registration mark is detected, and the printing plate is moved so that the position of the registration mark in the vertical direction matches the left registration mark. Then, the printing plate is fixed at that position, and a pair of U-shaped punch holes are formed at predetermined intervals on the lower side (holding side) of the printing plate. In the case of multi-color printing, after the second plate, the positions of the left and right registration marks stored in the first plate are set as reference positions, and the printing plates are arranged so that the left and right registration marks of each plate match the reference position. Once positioned, punching is performed at that position to form a pair of U-shaped punch holes.

By forming the punch holes in this way, the positions of the punch holes become constant with respect to the pattern of each printing plate, so that the punch holes are inserted into the positioning pins provided in the printing machine. When the printing plates are set in the printing machine in this manner, the positions of the patterns on the respective printing plates become constant, and color misregistration does not occur.

[0005]

However, even if the positions of the punch holes are determined in such a manner, the center line of the pattern printed on the printing plate does not always coincide with the center line between the punch holes. On the other hand, printed matter is often printed on both front and back sides. In the case of such double-sided printing, punch holes are formed in the front printing plate and the back printing plate as described above, and they are set in a printing machine to perform double-sided printing. The position on the back and the pattern on the back may be off by a few mm. If the positions of the patterns are deviated on both the front and back sides in this way, the patterns may be cut off by cutting or folding after printing. Therefore, it is necessary to align the center lines of the front and back patterns, which requires a lot of labor and time.

The present invention has been made in view of such circumstances, and an object thereof is to set a printing plate in a printing machine by utilizing punch holes formed in the printing plate. It is possible to obtain a method for producing a printing plate having punch holes for setting in a printing machine, which can make the positions of the patterns on each printing plate coincide with each other.

[0007]

In order to achieve this object, according to the invention of claim 1 of the present application, when the first plate is prepared, the left and right register marks which are printed on the plate together with the pattern. After moving the printing plate so that the center line between the punch holes and the center line between the pair of punch holes to be formed coincide with each other, the position of the register mark at that time is stored, and the plate is fixed at that position. , When a pair of U-shaped punch holes are formed on the edges of the printing plate to make printing plates for the second printing plate and thereafter, the position of the register mark printed on the printing plate is stored in the first printing plate. After the printing plate is positioned and fixed so as to match the position of the register mark of the printing plate, a pair of U-shaped punch holes are formed in the holding edge of the printing plate.

Further, in the invention of claim 2 of the present application, the register marks in which the center line between the left and right register marks previously printed on the printing plate together with the pattern and the center line between the pair of punch holes to be formed coincide with each other. The position of the plate is memorized, and when making a printing plate, after positioning and fixing the plate so that the position of the register mark printed on the plate matches the stored position of the register mark. , A pair of U-shaped punch holes are formed on the edges of the plate.

Further, in the invention of claim 3 of the present application, a pair of U-shaped punch holes are formed in advance in the gripping side of the unexposed printing plate, and the printing plate is positioned and fixed by these punch holes. After that, the center line between the punch holes and the center line of the pattern coincide with each other, and the pattern is printed on the plate so that the pattern is located at a predetermined distance from the punch hole.

With this structure, the center of the pattern printed on the printing plate is always located on the center line between the pair of punch holes. Therefore, the respective punch holes are used to make each printing plate. If is set in the printing machine, the center of the printed pattern is always at a fixed position. Therefore, even if the double-sided printing is performed, the deviation of the design on the front and back does not occur.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a schematic perspective view showing an example of a plate punching device used for carrying out the method for making a plate according to the present invention. This punch device has the same structure as that of the invention of Japanese Patent Publication No. 7-78633 described above, and has a vertical plate support table 2 on which the plate 1 is placed.
It has. Below the plate support table 2, the lower edge of the plate 1 is supported at a position equidistant from the vertical centerline OO of the table 2, and the left and right parts of the plate 1 are supported. Plate receiving bases 3 and 3'which are respectively moved in the vertical direction are provided. Those plate pedestals 3,
3'is vertically moved independently by a step motor. In addition, the plate support 3,
At positions adjacent to 3 ', punching devices 4, 4'for forming a U-shaped punch hole by cutting the lower side of the printing plate 1 supported by the pedestals 3, 3'into a U-shape are provided. ing.
The punches 4 and 4'are the center line OO of the table 2.
They are arranged at positions equidistant from each other, and the distance between them is adjusted stepwise to a predetermined size. In addition, the plate 1
Is provided with plate moving mechanisms 5 and 5'for centering the plate and moving the plate 1 left and right. The plate moving mechanisms 5 and 5 ′ are for sandwiching the plate 1 from the left and right sides and moving the plate 1 as it is, and are composed of a rack and pinion mechanism. The surface of the plate support table 2 can be vacuum-sucked by a vacuum pump (not shown), whereby the plate 1 is sucked and fixed on the surface of the table 2.

Further, on the surface of the plate support table 2, a pair of CCD cameras 6 and 6'is arranged on both the left and right sides thereof. The cameras 6 and 6'are vertically and horizontally moved by a horizontal movement mechanism 7 and vertical movement mechanisms 8 and 8 '. The images photographed by the cameras 6 and 6'are displayed on monitors 9 and 9'arranged on the sides of the plate support table 2, respectively. The monitors 9 and 9'are attached to a control panel 10 having a built-in arithmetic mechanism. A cross-shaped reference line is displayed on the monitors 9 and 9 '.

Next, the procedure for forming a pair of U-shaped punch holes in the printing plate 1 using the punching device thus constructed will be described. The printing plate 1 has a design 11 and the design 1
The left and right register marks 12, 12 'and the upper and lower register marks 13, 13' showing the center position of 1 are printed. Generally, the pattern 11 is twisted with respect to the plate 1 as shown in FIG. 2A (however, it is exaggerated for convenience of description), and moreover, from the center of the plate 1. It is printed in a shifted state. However, the picture 11
The positions of the register marks 12, 12 '; 13, 13' with respect to are accurate. In this example, those register marks 12, 12 ';
13, 13 'are cruciform.

When punch holes are formed in the printing plates 1, 1, ... For multi-color printing on both sides, first, the first printing plate 1 for front surface printing is placed on the printing plate support table 2 and The lower edge (holding edge) is supported by the plate receiving trays 3, 3 '. And
In that state, the switch of the punch device is turned on. Then, the plate moving mechanisms 5 and 5'actuate to center the plate 1. When the centering is completed, the plate moving mechanism 5, 5'is once released. Then C on the left
The CD camera 6 is moved and positioned on the register mark 12 on the left side of the printing plate 1. Then, the register mark 12 is displayed on the left monitor 9, and the position of the camera 6 is adjusted so that the center (intersection point) of the register mark 12 is located on the horizontal reference line marked on the monitor 9. On the other hand, the CCD camera 6'on the right side
Is moved to the same height position as the left camera 6 and moved to the right registration mark 12 'of the printing plate 1, and the registration mark 12' is displayed on the right monitor 9 '. And
The right plate support 3'is operated to slightly move the right part of the plate 1 up and down to position the center of the register mark 12 'on the horizontal reference line marked on the monitor 9'. Next, the left CCD camera 6 is slightly moved left and right to match the center of the registration mark 12 on the left side with the center (intersection point) of the reference line written on the monitor 9. And the position of the camera 6 at that time,
The coordinates in the horizontal direction and the vertical direction are temporarily stored in the memory in the control panel 10. Also, the CCD camera 6'on the right side
Is also finely moved to the left and right, and the horizontal position of the camera 6'is finely adjusted so that the center of the right registration mark 12 'coincides with the center of the reference line written on the monitor 9'. Then, the position of the camera 6'at that time is stored in the memory in the control panel 10.

In this state, the pattern 11 of the plate 1 is parallel to the horizontal line of the plate support table 2. However, as shown in FIG. 2B, the left and right centerlines of the pattern 11, that is, the centerline PP between the left and right register marks 12 and 12 'is the centerline between the punches 4 and 4'. That is, it is deviated from the vertical center line OO of the table 2 by a. Therefore, the shift mechanism a in the control panel 10 calculates the deviation a from the positions of the cameras 6 and 6'stored in the memory, that is, the positions of the left and right registration marks 12 and 12 '. Then, the camera 6, so that the deviation a is eliminated
6'moves to the left and right, and its position is corrected. The positions of the cameras 6 and 6'at that time are stored in the memory as reference positions. After that, the plate moving mechanism 5, 5'is driven to move the plate 1 in the left-right direction, and the left and right register marks 12, 1 are moved.
Align the center of 2'with the center of the reference line of the monitors 9, 9 '. By doing so, the center line P of the pattern 11
-P and the center line OO between the punches 4, 4'coincide. Then, the vacuum pump is operated to adsorb and fix the printing plate 1 on the surface of the table 2. And punch device 4, 4 '
2 to activate the printing plate 1 as shown in FIG.
A pair of U-shaped punch holes 14 and 14 'are formed in the lower holding edge.

When punch holes are formed in the second and subsequent printing plates, the printing plate 1 is placed on the table 2 in the same manner as the first printing plate, and the left and right cameras 6, 6'are placed in the control panel 10. Move to the reference position stored in memory. The plate 1 is moved vertically and horizontally by the plate receiving trays 3 and 3'and the plate moving mechanisms 5 and 5 ', and the left and right register marks 12 and 12' displayed on the monitors 9 and 9'are monitored. , 9 ′ to the reference line. Then, the printing plate 1 is suction-fixed at that position, and the punching devices 4 and 4'are operated to form punch holes 14 and 14 'in each printing plate 1.

When forming punch holes on the printing plate for backside printing, the left and right registration marks 12, 12 'printed on the first printing plate 1 are detected, and the registration marks 12, 12' are detected. The printing plate 1 is moved so that the position in the up and down direction coincides with the position in the up and down direction of the register marks 12, 12 'on the left and right of the printing plate 1 for the front side. Then, in the same manner as described above, the printing plate 1 is positioned so that the center line P-P between the register marks 12 and 12 'coincides with the center line O-O between the punches 4 and 4'. After that, punch holes 14 and 14 'are formed at the same intervals as those of the front plate 1. The second printing plate 1 and the subsequent printing plates 1 have left and right registration marks 12 stored in the first printing plate,
The 12 'position is used as a reference position, and each printing plate 1 is placed at the reference position.
The printing plate 1 is positioned so that the registration marks 12, 12 'on the left and right sides of the printing plate 1 are aligned, and punching is performed at that position.

When the punch holes 14, 14 'are formed in each of the printing plates 1, 1, ... In this way, the punch holes 14, 1 are formed.
4'is the pattern 11, 1 of each printing plate 1, 1, ...
It is formed at a fixed position with respect to the center of 1, .... Therefore, if each of the printing plates 1, 1, ... Is set in the printing machine by utilizing the punch holes 14, 14 ',
The centers of the printed patterns all coincide with each other, and even when double-sided printing is performed, the positions of the patterns do not shift between the front and back sides.

An example of manually moving and adjusting the CCD cameras 6, 6'and the like has been described above. However, if this punch device is used, the punch holes 14, 14 'can be formed semi-automatically. it can. In that case, the distance between the left and right registration marks 12, 12 'is obtained in advance from the size of the printing plate 1, and the left and right registration marks 12 are arranged so that the center line between them coincides with the center line between the punches 4, 4'. , 12 'in the horizontal direction are determined. In addition, the vertical coordinates of the left and right registration marks 12, 12 'are determined in consideration of the grip margin and the like. Then, the coordinates are input to the control panel 10. When forming punch holes in the multi-color printing plates 1, 1, ..., First, the first plate 1 is placed on the plate support table 2 and then underneath, as in the above example. The edges (edges) are supported by the printing plate trays 3 and 3 '. Then, in that state, the automatic mode switch of the punching device is turned on. Then, first, the plate moving mechanism 5, 5'centers the plate 1. Next, the left and right CCD cameras 6 and 6'move to respective coordinate positions. Therefore, the plate 1 is moved vertically and horizontally by the plate receiving trays 3 and 3'and the plate moving mechanisms 5 and 5 ', and the left and right register marks 12 and 12' displayed on the monitors 9 and 9'are monitored. , 9 ′ to the reference line. At that position, the printing plate 1 is adsorbed and fixed, and the punching devices 4 and 4'are operated so that the punching holes 14,
14 '. Even when punch holes are formed in the second and subsequent printing plates 1, if the printing plate 1 is placed on the printing plate support table 2 and the start button is pressed, the printing plate 1 is centered similarly. , The left and right CCD cameras 6 and 6'move to the same positions as in the case of the first plate. Therefore, the punch holes 14 and 14 'can be similarly formed.

Further, recently, a pattern layout or the like is performed on a display screen, the data is converted into a digital signal and stored in a compact disc or the like, and at the time of plate making, the data is printed on an unexposed plate. It is also possible to directly output and develop the printing plate, but by using such means, it is easier to match the center line of the pair of punch holes with the center line of the pattern. Becomes In that case, as shown in FIG. 3A, first, a pair of U-shaped punch holes 104 and 104 'are formed at a predetermined interval on one side (holding side) of the unexposed plate 101. To do. Then, as shown in FIG.
A pair of pins 10 at the same intervals as the positioning pins of the printing machine.
5 and 105 'are provided on the plate stand 102, and the pins 105 and 105' are used for positioning and setting,
The plate 102 is fixed. Then, punch holes 104,
The data stored in the compact disc or the like is directly output onto the printing plate 101 while controlling so that the center line between 104 ′ and the center line of the pattern coincide with each other, as shown in FIG. Pattern 111 is printed. Then, the plate 101 is subjected to development processing to make a plate for printing. According to such a method, all the plates made are highly accurate, and the patterns of the plates are surely matched even when set in the printing machine, so that there is no color misregistration for cutting. An easy double-sided printed matter can be obtained.

In this case, the plate base 102 is not limited to a flat plate type, but may be a drum type. Further, as a method of fixing the printing plate 101, any of a pin system, vacuum suction, adhesion, and sticking can be adopted. In particular, when the plate table 102 has a drum shape, the printing plate 101 can be wound and fixed. As the pattern data, an original plate read by a scanner, a digital camera or the like, color-separated, converted into a digital signal and stored in a compact disk, a floppy disk or the like can be used.

[0022]

As is apparent from the above description, according to the present invention, the center line of the design of the printing plate and the center line between the pair of left and right punch holes are made to coincide with each other. If the plate is set in the printing machine by using, the center of the pattern to be printed is always located in the center between the punch holes. Therefore, even when double-sided printing is performed, the design does not shift between the front and back, and cutting and folding are facilitated. As a result, the operating rate of the printing machine can be increased.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a punching device used to carry out a method of making a printing plate according to the present invention.

FIG. 2 is an explanatory diagram for explaining a procedure of a method for producing a printing plate according to the present invention.

FIG. 3 is an explanatory diagram for explaining a different procedure of the method for producing a printing plate according to the present invention.

[Explanation of symbols]

 1 plate 2 plate support table 3, 3'plate support 4, 4 'punch device 5, 5' plate moving mechanism 6, 6 'CCD camera 7 camera left and right moving mechanism 8, 8' camera up and down moving mechanism 9 , 9 'Monitor 10 Control board 11 Design 12, 12' Registration mark 14, 14 'Punch hole 101 Unexposed printing plate 102 Plate stand 104, 104' Punch hole 111 Design

Claims (3)

[Claims] 1. A method for producing a multicolor printing plate having a pair of U-shaped punch holes for setting in a printing press at the gripping side; producing a first plate. Occasionally, the plate is moved so that the center line between the left and right register marks printed with the design on the plate and the center line between the pair of punch holes coincide with each other, and the position of the register mark at that time is adjusted. After memorizing and fixing the printing plate at that position, the punch holes are formed in the gripping edge of the printing plate, and when creating the second and subsequent printing plates, The position where the position is stored
A punch for setting on a printing press, characterized in that after the printing plate is positioned and fixed so as to match the position of the register mark of the printing plate of the plate, the punch hole is formed in the holding edge of the printing plate. Method of making a printing plate having holes. 2. A method for producing a multicolor printing plate having a pair of U-shaped punched holes for setting in a printing press at the grips; the plate is previously printed with a pattern. The position of the register mark where the center line between the left and right register marks and the center line between the pair of punch holes are stored is stored, and when the plate is made, the register mark of the register mark printed on the plate is stored. The printing plate is characterized in that after the printing plate is positioned and fixed so that the position matches the stored position of the register mark, the punch hole is formed in the holding edge of the printing plate. A method for producing a printing plate having punch holes for setting. 3. A method for producing a multicolor printing plate having a pair of U-shaped punched holes for setting in a printing machine at the holding edge; the gripping of an unexposed printing plate in advance. After forming the pair of punch holes on the sides and positioning and fixing the printing plate by these punch holes, the center line between the punch holes and the center line of the pattern match, and A method for producing a printing plate having a punch hole for setting on a printing press, wherein the pattern is printed on the plate so that the pattern is located at a predetermined distance from the punch hole.