JPH057708B2 - - Google Patents

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) The present invention relates to a plate-making method for optically producing a printing plate for printing, and in particular, it relates to a plate-making method for optically producing a printing plate for printing. The present invention relates to a plate-making method in which a printing plate is exposed to light and a positioning portion such as a hole or notch is formed at a fixed position on the printing plate relative to an original portion of a film.

(Prior Art) When printing plates of various colors for multi-color printing are installed in a printing press, if there is an error in the positional relationship of the printing plates of each color, this appears as an error in the registration accuracy of the printed matter.

Therefore, a pin system is widely used as a means to minimize the deviation in the positional relationship of printing plates of each color. With this pin system, multiple positioning holes are drilled at fixed positions on the original part of the film that represents each color of the original individually, and these holes are fitted into positioning pins provided on the exposure machine. By doing this, each film is held in the exposure machine and its document part is positioned at a predetermined position.Also, holes and notches for positioning are formed in multiple locations on the unexposed printing plate, and these holes and By fitting the notches to positioning pins provided on the exposure machine, each film and unexposed printing plate are positioned, and in this state, the original of each film is exposed to the printing plate, and then removed from the exposure machine. After development, the printing plate of each color is bent to be mounted on a rotary press using the holes and notches as a reference, and when the printing plate of each color is mounted on a rotary press, the holes and notches are used as positioning standards. It is used.

(Problem to be solved by the invention) As mentioned above, in the conventional pin system, holes and notches for positioning are formed in advance at fixed positions on the printing plate of each color, and these holes and notches are used to The position of the printing plate is determined during each process of exposure, plate bending, and mounting.

By the way, in the case of printing plates for newspaper printing, etc., synthetic resin printing plates are used based on thin metal plates, so the synthetic resin swells around the holes and notches that have been formed, making the holes and notches narrower. During the exposure process, it is difficult to fit the holes and notches of the printing plate into the pins of the exposure machine.
It is difficult to automate and it takes time to do it manually, especially in the case of newspaper printing, where many printing plates are made from the same film, so it takes too much time to do it manually for each sheet.

The present invention was made in view of the above points, and it is possible to eliminate the need to fit positioning parts such as holes and notches of the printing plate into pins of an exposure machine during the exposure process. The purpose is to maintain a predetermined positional relationship between the original part exposed from the film onto the printing plate and the positioning parts such as holes and notches in the printing plate without using a positioning part such as a plate. In the process, positioning parts such as holes and notches in the printing plate can be used.

[Structure of the invention]

(Means for Solving the Problems) The present invention exposes the original represented on the film 2 to the printing plate 1, and at the same time, the holes 26, notches 25, etc. This relates to a plate-making method in which a positioning portion is drilled, the plate plate 4 having the printing plate 1 fixed on its upper surface, holding the film 2 and positioning the original part at a predetermined position, and placing the original on the plate. An exposure device 31 that exposes the printing plate 1 on the plate 4, and a printing plate 1 on the plate 4 that advances and retreats in the horizontal direction relative to the printing plate 1 on the plate 4.
The exposure device 31 is positioned in a predetermined positional relationship with respect to the printing plate 4 using punching machines 21 and 22 that punch positioning portions 25 and 26 at the plate 4, and the original of the film 2 is exposed on the printing plate 1. process, and the punching machine 2 for the printing plate 1 on the printing plate 4.
1 and 22 relative to each other, positioning the punching machines 21 and 22 in a predetermined positional relationship with respect to the printing plate 4, and punching positioning parts 25 and 26 in the printing plate 1. This is done continuously with the printing plate 1 fixed in place.

(Function) The plate making method of the present invention uses an exposure machine 31 positioned in a predetermined positional relationship with respect to the plate 4 while the printing plate 1 remains fixed on the plate 4. The original on the positioned film 2 is transferred to the printing plate 4.
The upper printing plate 1 is exposed to light, and punching machines 21 and 22 which are positioned in a predetermined positional relationship with respect to the printing plate 4 are used.
The positioning parts 25 and 26 are placed on the printing plate 1 on the printing plate 4 by
It is intended to create a hole.

(Example) An example of the plate making method of the present invention will be described with reference to the drawings.

1 to 4 show a first embodiment. In this embodiment, originals displayed on the same film 2 are printed on one printing plate 1 in parallel at different locations. This is an example of multiple exposure.

Reference numeral 3 denotes a horizontally provided base, and a plate 4 is provided on the upper surface of this base 3 so as to be horizontally movable in the left and right direction along a straight groove 5 with its upper surface aligned with the base 3, As shown in FIGS. 1 and 2, the plate 4 is moved to the right and comes into contact with the stopper 6 to be positioned at the right position.
As shown in the drawings and FIG. 4, when it is moved to the left, it comes into contact with the stopper 7 and is positioned at the left fixed position.

A first suction zone 11 is set on the upper surface of the plate 4, and a second suction zone 1 is set on the upper surface of the base 3 on both sides of the linear groove 5 in which the plate 4 moves.
2. Third adsorption zone 13 and 4 adsorption zone 1
4 are set sequentially from right to left, and each of these first to fourth adsorption zones 11, 12, 13,
14 are provided with independent suction grooves (not shown), and each suction zone 11, 12, 13, 1
By independently suctioning the air in the suction grooves 4, the printing plate 1 can be independently suctioned and fixed in each suction zone 11, 12, 13, 14.

Further, on the upper surfaces of the plate 4 and the base 3, there is a first suction zone 11 of the plate 4 that has been moved to the right position, and a second suction zone 12 and a third suction zone 13 of the base 3 on both sides thereof. Pins 15, 16, and 17 for positioning the printing plate 1 at a position covering the plate are provided so as to be retractable. In addition, this pin 15, 16, 17
When the printing plate 1, which is positioned at
The suction zone 13 and the fourth suction zone 14 are covered.

Further, punching machines 21 and 22 are provided on the upper right and left ends of the base plate 3 so as to be horizontally movable in the left and right direction along the straight grooves 23 and 24 adjacent to the straight groove 5. punching machine 21
As shown in FIG. 2, the plate advances to a fixed position on the right edge of the printing plate 1 located at the right fixed position, and at this fixed position, a rectangular notch 25 is formed in the printing plate 1 as a positioning part. , the left punching machine 22 is
As shown in FIG. 4, the printing plate 1 moves to the left-hand position and advances to a fixed position on the left edge of the printing plate 1, and at this fixed position, a circular hole 26 is formed in the printing plate 1 as a positioning part. ing.

Further, an exposure device 31 is provided at the upper center of the base 3, that is, above the third suction zone 13. This exposure machine 31 has a vertically movable light shielding hood 32 below a light source (not shown), and below this hood 32 there is a mechanism for holding and positioning the film 2, and a mechanism for holding and positioning the film 2, and a mechanism for holding and positioning the film 2, and a mechanism for holding and positioning the film 2. A well-known mechanism for bringing the plate 1 into close contact with the plate 1 on the plate 4 by squeezing or the like is provided.

Note that the positioning of the film 2 in the hood 32 of the exposure device 31 is similar to the conventional pin system, and a plurality of positioning holes are drilled at predetermined positions relative to the document portion of the film 2. The document portion of the film 2 is positioned at a predetermined position by fitting the hole into a positioning pin provided on the exposure device 31, and the right and left positions of the exposure device 31 and the printing plate 4 are connected to each other. By setting a predetermined positional relationship, the document portion of the film 2 and the right and left positions of the printing plate 4 are set in a predetermined positional relationship.

Then, first, the state shown in Figure 1, that is,
The plate 4 is located at the right position, the left and right punching machines 21, 22 are retreated outward, and each pin 15, 16,
17 protrudes above the plate 4 and the base 3, and the exposure machine 31
With the hood 32 raised, the unexposed printing plate 1
from the direction of arrow a onto the base plate 3 and platen 4,
The printing plate 1 is positioned in a fixed position with respect to the printing plate 4 by contacting each pin 15, 16, 17, and then the printing plate 1 covers the first suction zone 11 of the printing plate 4 and the base 3, The second suction zone 12 and the third suction zone 13 are turned on from the off state to fix the printing plate 1 by suction.

Then, as shown in FIG.
After burying 6 and 17 in the plate 4 and the base 3,
The punching machine 21 on the right side has been moved to the inside advancing position, and the printing plate 1 is located at the right position together with the plate plate 4.
At this advanced position, the punching machine 21 is operated to form a rectangular notch 25 in the printing plate 1, and at the same time, the light-shielding hood 32 of the exposure machine 31 is lowered. , the film 2, which has been previously held and positioned at the bottom of the hood 32, is placed on the printing plate 1.
The light source of the exposure device 31 is turned on for a predetermined period of time, and the document on the film 2 is placed in the right position on the printing plate 1.
The left side of the image is exposed.

Next, as shown in FIG. 3, the hood 32 of the exposure machine 31 is raised and the punching machine 21 is raised.
from the inner position to the outer position, and after this,
By leaving the first suction zone 11 of the printing plate 4 and turning off the other suction zones 12 and 13 that are in the on state, the printing plate 1 is fixed only to the printing plate 4, and in this state. , move the printing plate 4 from the right position to the left position and position the printing plate 1 at the left position,
After this, the third suction zone 13 and the fourth suction zone 14 of the base plate 3 covered by the printing plate 1 are transferred to the first suction zone of the printing plate 4.
The printing plate 1 is in the on state in the same way as the suction zone 11 of
Fix by suction.

Next, as shown in FIG. 4, the punching machine 22 on the left side is moved to the inward advancing position, and together with the printing plate 4, it is advanced to the left side edge of the printing plate 1, which is located at the left position. At the advance position, the punching machine 22 is operated to form a circular hole 26 in the printing plate 1,
Along with this, a light-shielding hood 32 of the exposure machine 31
The film 2, which has been previously held and positioned at the bottom of the hood 32, is brought into close contact with the printing plate 1.The light source of the exposure device 31 is turned on for a predetermined period of time, and the original on the film 2 is placed in the left position of the printing plate. Expose the right side of 1.

Then, as shown in FIG. 3 again, the hood 32 of the exposure machine 31 is raised and the punching machine 22 is raised.
from the inner position to the outer position, and after this,
By turning off the suction zones 11, 13, and 14 of the platen 4 and base 3 covered by the printing plate 1, the fixation of the printing plate 1 is released, and in this state, the printing plate 1 after exposure is released. It is carried out in the direction of arrow b and conveyed to a developing machine.

After carrying out the printing plate 1, the printing plate 4 moves to the right position, and each pin 15, 16, 1
7 protrudes above the plate 4 and the base 3,
Returning to the state shown in FIG. 1 again, the next printing plate 1 is received and exposed and punched.

In this way, the printing plate 1 fixed to the printing plate 4 does not change its position relative to the printing plate 4 until the exposure and punching are completed.
Although it moves left and right, it is accurately positioned at the left and right fixed positions, and the punching machines 21 and 22 advance accurately to the left and right fixed positions of this plate 4, and similarly, this plate The exposure machine 31 is positioned with respect to the left and right fixed positions of 4, and this exposure machine 31
The document portion of the film 2 is positioned accurately as in the conventional case. Therefore, in all printing plates 1, the positional relationship between the document portion exposed from the film 2 and the notches 25 and holes 26 is the same, and in the subsequent process of bending the plate and mounting it on the rotary press, the printing plate 1 The holes 26 and notches 25 can be used in the same way as before.

In this embodiment, a vacuum was used as a means for adhering the printing plate 1 to the printing plate 4, but static electricity may also be used.
It is not limited to movable type, but it can also be placed in a predetermined position (see Figures 2 and 4).
Further, in this embodiment, the width of the printing plate 4 can be increased and the suction zones 12, 13, 14 of the base 3 can be omitted.

5 and 6 show a second embodiment, and this embodiment is an example in which a document displayed on a film (not shown) is exposed only once for one printing plate 1. .

In addition, when explaining this example, the first
Components similar to those in the first embodiment described in FIGS. 4 through 4 are denoted by the same reference numerals, and detailed explanation thereof will be omitted.

In this embodiment, the printing plate 4, which fixes the printing plate 1 using vacuum or static electricity, is placed along the straight groove 5 of the base 3, at the exposure position where it abuts against the stopper 6 and at the punching position where it abuts against the stopper 7. Although not shown, an exposure machine similar to the exposure machine 31 shown in FIGS. 1 to 4 is provided above the exposure position, and an exposure machine similar to the exposure machine 31 shown in FIGS. Punching machines 21 and 22 are on the base 3 on the other side.
is fixedly provided.

Then, as shown in FIGS. 5 and 6, the printing plate 4 is located at the exposure position, and each pin 15, 16,
17 protrudes above the printing plate 4 and base 3, and the hood of the exposure machine is raised, move the unexposed printing plate 1 in the direction of arrow a.
Carry it onto the base 3 and plate 4 from the direction, and place each pin 1
5, 16, and 17, the printing plate 1 is positioned at a fixed position relative to the printing plate 4, that is, a fixed position relative to the exposure machine, and then the printing plate 1 is fixed to the printing plate 4.

Next, after each pin 15, 16, 17 is buried in the plate 4 and the base 3, the light-shielding hood of the exposure machine is lowered, and a film (not shown), which has been held and positioned in advance under the hood, is printed. The film original is brought into close contact with the printing plate 1, and the light source of the exposure machine is turned on for a predetermined period of time to expose the film original onto the printing plate 1.

Next, after raising the hood of the exposure machine, press plate 4.
is moved from the exposure position to the punching position to position the printing plate 1 at the position relative to the punching machines 21 and 22.

Next, the punching machines 21 and 22 on both sides are operated to form circular holes and rectangular notches (not shown) in the printing plate 1.

Next, after releasing the fixation of the printing plate 1 by the printing plate 4, the exposed printing plate 1 is carried out in the direction of arrow b and conveyed to a developing machine.

After carrying out the printing plate 1, the printing plate 4 moves to the exposure position, and each pin 15, 16,
17 protrudes above the printing plate 4 and base 3, the state returns to the state shown in FIGS. 5 and 6, and the next printing plate 1 is received for exposure and punching.

In this way, the printing plate 1 fixed to the printing plate 4 does not change its position relative to the printing plate 4 until the exposure and punching are completed.
is the punching machine 2 at the punching position.
1 and 22, and similarly, this printing plate 4 is positioned at a fixed exposure position with respect to an exposure machine, and the document portion of the film is precisely positioned in this exposure machine as before. Therefore, in all printing plates 1, the positional relationship between the original portion exposed from the film and the notches and holes matches, and in the subsequent process of bending the plate and mounting it on a rotary press, the holes and holes in the printing plate 1 The cutout can be used in the same way as before.

In this embodiment, the plate 4 on which the printing plate 1 is fixed is moved from the exposure position to the punching position,
Although the exposure was performed first, it is also possible to move from the punching position to the exposure position and perform punching first.Alternatively, the punching machine 21, 22 may be formed to be movable forward and backward.

Then, as in each of the above embodiments, when exposing the printing plate 1, the printing plate 1 which was an obstacle to automation.
There is no need to fit the pins into the notches 25 and holes 26, and furthermore, the loading (arrow a) and unloading (arrow a) of the printing plate 1 can be automated using an appropriate conveyance means, and other operations can be easily performed. Since it can be automated, it is possible to promote automation of the entire plate-making process, including not only the printing plate exposure process but also other processes.

(Effects of the Invention) As described above, according to the present invention, when exposing a film original to a printing plate, positioning portions such as holes or notches of the printing plate are fitted into pins of an exposure machine, etc. In other words, without using a positioning part such as a hole or notch in the printing plate, the part of the original that is exposed from the film to the printing plate and the positioning part such as a hole or notch in the printing plate are held in a predetermined positional relationship. Therefore, it becomes possible to automate the exposure process, and in the subsequent plate bending and mounting process, positioning parts such as holes and notches in the printing plate can be used in the same way as in the past.

[Brief explanation of the drawing]

Figures 1 to 4 show the first plate-making method of the present invention.
5 and 6 are explanatory diagrams showing a second embodiment of the plate-making method of the present invention, respectively, A is a plan view and B is a front view. FIG. 5 is a plan view, and FIG. 6 is a cross-sectional view taken from the side of FIG. 5. 1...Printing plate, 2...Film, 4...Plate plate, 2
1, 22... Punching machine, 25... Notch as a positioning part, 26... Hole as a positioning part,
31... Exposure machine.

Claims (1)

[Scope of Claims] 1. A plate-making method in which a document represented on a film is exposed to light on a printing plate, and a positioning portion is bored at a predetermined position on the printing plate relative to the document portion of the film, the printing plate having the above printing plate on the upper surface. a printing plate for fixing the film; an exposure machine for holding the film and positioning the original part in a predetermined position; and exposing the original to the printing plate on the printing plate; Using a punching machine that moves forward and backward in the horizontal direction to punch positioning portions in the printing plate on the printing plate, the exposure device is positioned in a predetermined positional relationship with respect to the printing plate, and the original of the film is transferred to the printing plate. and a step of advancing the punching machine relative to the printing plate on the printing plate, positioning the punching machine in a predetermined positional relationship with respect to the printing plate, and punching a positioning part in the printing plate. A plate-making method characterized in that the steps are continuously performed with the printing plate fixed on the plate.