JPS62287255A - Multiplane exposing method for plate making copying machine - Google Patents

Abstract

PURPOSE:To perform multiplane exposure correctly and adjacently without forming any double exposed part on a photosensitive material by providing an image formation optical system which runs between an original setting surface and a photosensitive material setting surface arranged in parallel. CONSTITUTION:An original rack 31 and a transparent plate 32 have the original setting surface and photosensitive material setting surface 2 in parallel to each other, and the scanning image formation optical system 4 is provided between both setting surfaces 1 and 2 so that it can run along both surfaces. Rolled master paper which in not exposed is fed onto the photosensitive material setting surface 2 by feeding device 7 and the optical system 4 is run to expose the master paper 6 to the image of an original picture 30; and this operation is repeated plural times to perform the multiplane exposure. The driving device 5 of the optical system 4 drives the optical system 4 by necessary distance from the origin position P0 of the original picture 30 according to the size of the picture on the basis of a position signal from a pulse encoder 38. The feeding device 7 for the master paper 6 feeds the master paper 6 by necessary length associatively with the forward movement of the optical system driving device 5.

Description

Detailed Description of the Invention 3-Details of On-Screening <Industrial Application Field> The present invention relates to a copying machine for plate making used to make plates for original plates for offset printing, and in particular to a copying machine for plate making used to make plates for original plates for offset printing. The present invention relates to a plate-making copying machine configured to perform multifaceted exposure on paper.

<Prior Art> Generally, when printed matter is small in size, two to three sides of the same pattern are printed on one printing plate at a time, and then cut. In this case, it is necessary to expose the same original image on a single sheet of master paper in advance.

In addition, it is said that printing plates such as master paper have a printing durability of approximately 10,000 copies, and as the number of copies printed increases, it becomes necessary to review and Q-penalize multiple printing plates. In this case as well, multiple exposures are performed on a single sheet of master paper from the viewpoint of improving work efficiency. Conventionally, it has been known that this multi-sided printing allows exposure to be easily performed using a copying machine for plate making.

For example, as this type of copying machine for plate making, the one shown in FIG. 6 is disclosed in Japanese Patent Application Laid-Open No. 61-4065.

A suction hook 104 is disposed in correspondence with an imaging optical system 103 consisting of a lens 101 and a mirror 102, and a master vapor 10 fed from a paper feeder 105 is
6 is held via the conveyor belt 107 of the succinct box 104, and is fed and stopped at a predetermined exposure position. 2 blackout curtain 108.1
When exposing the multi-faceted material to light, by pulling out the first light-shielding curtain 108 during the first image capture, the exposed portion of the master vapor 106 during the second image capture is shielded from light. and then continue with master vapor 1.
06 to a required length and stop it, and also pull out the second light shielding curtain 109 to remove the master vapor 106.
The latent image formed in the first imaging is shielded from light and the second exposure is performed.

<Problems to be Solved by the Invention> However, in the conventional example described above, when exposing a multi-faceted material, it is essential to shield the required part of the master vapor from light by pulling out the light-shielding curtain according to the image pickup size. The light-shielding curtain must be attached to the photographing section, and modification thereof is not easy.

Moreover, as the light-shielding curtain is driven, the multi-faceted material is difficult to improve the efficiency of exposure.

According to the present invention, the multi-sided material does not require special means that are used only for exposure, and the present invention discloses an exposure method for the multi-sided material, which is easy to modify and is efficient in modifying the current copying machine. That purpose.

<Means for Solving the Problems> In order to solve the above problems, the present invention is configured as follows.

In other words, as a copying machine for plate making, a scanning imaging optical system having an original illumination light is installed between the original placing surface and the photosensitive material (master vapor) placing surface, which are arranged parallel to each other. A device is used in which the original image is scanned and exposed onto a photosensitive material while traveling along the photosensitive material.

When exposing a multifaceted material, the optical system is moved forward by the required distance from its origin position to perform the first scanning exposure, and then the photosensitive material is exposed by moving the optical system back to its origin position. After feeding the optical system for the backward movement distance, the second
Perform the second scanning exposure. By repeating this process, the multifaceted material is exposed to light.

Function: Since the forward movement distance of scanning imaging optics from its origin position is determined by the size of the document, it is possible that the first scanning exposure will expose unnecessary parts of the photosensitive material. There isn't. Since the sensitive material is fed by the distance of the optical system's backward movement in response to the backward movement of the optical system, the original images are correctly adjacent to each other in the second scanning exposure without producing double exposed areas. The faceted material is exposed to light.

This eliminates the need for a light-shielding curtain as in the conventional example, and since the photosensitive material is fed by a predetermined distance when the optical system moves back, it is possible to drive the copying machine efficiently.
1-1+door 1; <Example> Hereinafter, the present invention will be described in detail based on the drawings.

FIG. 1 is a brochure diagram showing the main structure of a copying machine for plate making according to the present invention, and FIG. 2 is a schematic diagram of the copying machine for plate making.

This copying machine for plate making is provided with an original shelf 31 having an original placing surface 1 and a transparent plate 32 having a sensitive material placing surface 2 so as to be parallel to each other, and between both RM surfaces 1 and 2. is provided with a scanning imaging optical system 4 movable in a direction along both surfaces, and feeds an unexposed roll-shaped master vapor 6 onto the sensitive material mounting surface 2 by a feeding device 7. is run to expose the image of the original image 30 to the master vapor 6. This is repeated several times to expose the multifaceted material. After cutting the rear end of the exposed portion 6a of the master vapor 6 with a counter device 8, it is discharged. The device 9 sends the master original plate 6b to the development processing device 25 for development processing, and the processed master original plate 6b is discharged onto the tray 26.

In this copying machine for plate making, the control device 1
a feeding device 7 for the rolled master vapor 6 via;
It is configured to organically drive and control the driving device 5, cutter device 8, discharge device 9, etc. of the scanning and imaging optical system 4.

The scanning and imaging optical system 4 is also provided in a horizontally elongated manner in the width direction along with a document illumination lamp 3 including a pair of linear light sources arranged in parallel in the width direction intersecting the scanning direction (arrow D). It has a square mirror 33 and an in-mirror lens 34, and is configured to form a slit-shaped image of the original image 30 on the photosensitive material mounting surface 2.

The drive device 5 of the optical system 4 is connected to a drive motor 35, a pair of pulleys 36, 36 rotated by the drive motor 35, an endless belt 37 wrapped around both boars, and one of the pulleys 36. and a pulse encoder 38, and adjusts the origin position P according to the size of the original image 30 based on the position signal from the pulse encoder 38. from,
The optical system 4 is configured to travel and drive by a required distance.

The feeding device 7 for the master vapor 6 includes a large number of feeding rollers 41 that pull out the remaster vapor 6 from a reel 40 and place it on the transparent plate 32, an interlocking chain 42 that interlocks these feeding rollers 41, and a drive. It comprises a motor 43 and a pulse encoder 44, and is configured to feed the master vapor 6 by a required length in conjunction with the return movement of the optical system drive device 5.

The discharge device 9 of the master vapor 6 removes the exposed portion 6a.
a large number of conveyance rollers 46 for discharging the conveyance rollers 46, an interlocking chain 47 that interlocks these conveyance rollers 46, a sensor 10 that detects the presence or absence of the master vapor 6a provided near the drive motor 48 and the photosensitive material discharge port 49; , comprises a relaxing means 11 provided immediately after the cutter device 8, and when the sensor 10 detects the tip of the master vapor 6 during exposure, the drive motor 48 is stopped to release the master vapor. At the same time as stopping the discharge of the master vapor 6, a solenoid 51 operates the relaxing means 11 to guide the surplus portion 6c of the master vapor 6, which is longer than the length of the discharge path, to the lower part of the discharge path and loosen it. When the above-mentioned relaxation means 11 is attached, there is an advantage that multi-sided exposure becomes possible without being restricted by the length of the discharge path.

The control device 13 is a so-called microcomputer, and includes a central control unit (CPU) 13a, a ROM 13b that stores predetermined programs, and a ROM 13b that stores data and the like.
AM13c, input interface 14a
It is connected to each drive device via an output interface 7/8 14b.

As shown in FIG. 1, this control device 13 includes an optical control section 15 that drives and controls the drive motor 35 of the optical drive device 5;
A feed control section 17 that drives and controls the drive motor 43 of the feed device 7, a cutter control section 18 that drives and controls the drive motor 50 of the cutter device 8, and a drive motor 48 of the discharge device 9.
A discharge control section 19 that drives and controls the solenoid 51 of the relaxation means 11, and a relaxation control section 20 that drives and controls the solenoid 51 of the relaxation means 11.
This will be explained based on the flowcharts shown in FIGS.

FIG. 3 shows a flowchart showing the control mode of the entire apparatus. When the power is turned on, the entire device is initialized in step S1. In this state, the scanning imaging optical system 4 is at the origin position P, and the tip of the master vapor 6 is also at the origin position P, corresponding to the optical system 4. is set to

In step S2, the document size (movement distance of the optical system 4 from the origin position P0) is set using the processing board 12, and the exposure mode is selected. The A mode is a normal exposure mode (hereinafter referred to as single-sided exposure mode), the B mode is a multi-sided exposure mode, and the C mode is a master vapor discharge mode after exposure is completed.

FIG. 4 is a flowchart showing mode A. When exposure is started in step A1, the illumination lamp 3 lights up and the signal ■ from the optical control section 15 is output, and in step A2, in response to the signal ■, the drive motor 35 is activated. Driven in forward rotation. In step A1, the backlog control unit 15 uses the pulse encoder 38
It is determined that the moving distance has been reached based on the position signal P from , and in step A4, the illumination lamp 3 is turned off and the drive motor 35 is stopped to complete the exposure. Next, in step A, the drive motor 35 is reversed, and the scanning and imaging optical system 4 returns to its original position P. At the same time, the drive motor 43 of the feeding device 7 and the drive motor 48 of the ejecting device 9 rotate forward based on the command signal J from the feeding control section 17 to move the master vapor 6 to its exposed portion 6a. The paper is fed until the rear end of the paper reaches the canter device 8. In step A6, the optical system 4 is at the origin P. It is determined that the
Then, the drive motor 35 stops, and after a short delay step A8
Then, the drive motors 43 and 48 are stopped, and the mode shifts to the next discharge mode C.

In the C-mode stenoa'CI, the exposed portion 6a of the master vapor 6 is held between the conveyance rollers 46 of the discharge device 9 and conveyance is stopped. Next, in step C2, the drive motor 50 rotates in response to the command signal Q from the cutter control unit 18, and the rotary blade type cutter device 8 operates to cut the master vapor 6. In step C1, upon receiving the command signal M from the discharge control section 19, the discharge drive motor 48 rotates to transfer the master vapor 6a to the developing processing device 25.
send to. In step C1, it is determined by the timer in the discharge control section 19 that the tip of the master vapor 6a is held between the feed rollers 25a of the developing processing device 25, and in step C9, the rotation of the discharge drive motor 48 is stopped. .

In this state, the conveying roller 46 becomes free and the master vapor 6a is fed to the developing processing device 25.

FIG. 5 is a 70-chart showing the exposure mode of multiple exposure, which is a feature of the present invention.

When the first exposure starts in step B1, the illumination lamp is turned on, and in step B2, the drive motor 35 is driven in normal rotation in response to the control signal (2) from the optical control section 15. In step B, the optical control unit 15 determines that the moving distance has been reached based on the position signal P from the pulse encoder 38, and in step B, the illumination lamp 3 is turned off, and
The drive motor 35 stops and the first exposure ends.

Next, in step B, the drive motor 35 is reversed and the scanning and imaging optical system 4 returns to its original position P. At the same time, the feeding device 7 moves back to
The drive motor 43 and the drive motor 48 of the ejecting device 9 rotate in the forward direction, and feed the master vapor 6 by the distance of the backward movement of the optical system. In step B6, the optical system is at the origin position P. The drive motors 35, 43, and 48 of the balance B are simultaneously stopped. Step B
When the second exposure starts at step 8, the illumination lamp 3 is turned on in the same manner as described above, and in step B, the drive motor 35 is driven in normal rotation. In step B to, it is determined that the optical system 4 has reached the moving distance, and in step B l l the illumination lamp 3 is turned off and the drive motor 35 is stopped to complete the second exposure. In step B12, the drive motor 35 is reversed so that the scanning and imaging optical system 4 moves to the origin position P,
At the same time, the drive motors 43 and 48 rotate normally to feed the master vapor 6 by the required length. At this time, the sensor 10 is also connected to the master vapor 6 in the balance B 13.
When the tip of a is detected, the drive motor 4 is activated in step B14.
8 and the solenoid 5 of the relaxation means 11.
1, the master vapor 6 is longer than the discharge path length.
The surplus portion 6c of the discharge passage is made to sag below the discharge passage. In step BI, the optical system 4 is at the origin position P. After determining that the drive motors 35 and 4 have returned to
Stop 3. In step B16, the multi-sided printing mode moves to discharge mode C upon determining that the exposure mode has ended.

In addition, after cutting the master vapor 6 in the C-mode stem (2), the drive motor 43 is slightly reversed to move the tip of the unexposed part of the master vapor 6 to the origin position P.

This is to prevent the master vapor 6 from being used in vain.

Further, although not described in detail, a single drive motor is used for both the drive motor 43 of the feeding device 7 and the drive motor 48 of the ejecting device 9, and a clutch device is interposed between the feeding device 7 and the ejecting device 9. It is also possible to interlock/switch drive as appropriate.

<Effects of the Invention> As described above, according to the present invention, a copying machine for plate making is provided with a scanning imaging optical system that runs between a document placement surface and a sensitive material placement surface that are arranged in parallel. In addition, when performing multi-sided exposure, following the first scanning exposure,
Since the second scanning exposure is performed after the optical system is moved back to its original position and the photosensitive material is fed by the distance of the backward movement, double exposure of the photosensitive material can be avoided. Properly adjacent multi-sided exposure can be done. As a result, there is no need for a light-shielding curtain as in the conventional example, and since multi-sided printing does not require the provision of special means for exposure, it is possible to easily improve the current copying machine.

Furthermore, since the photosensitive material is fed by the length of the backward movement when the optical system moves backward, the alignment of the position of the photosensitive material is accurate and no waiting time is required. can be increased.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the main configuration of a copying machine for plate making according to the present invention, FIG. 2 is a schematic diagram of the copying machine for plate making, and FIGS. 3 to 5 show control modes of the copying machine for plate making, respectively. FIG. 6 is a schematic diagram of a conventional plate-making copying machine. 1...Original placement surface, 2...Sensitivity material placement surface, 3...
・Document illumination light, 4...Scanning and imaging optical system, 5...
Optical system drive device, 6...Sensitive material (master vapor),
7... Feeding device, 8... Cutter device, 9
...Discharge device, 10...Sensor, 11...
- Relaxation means, 12... scraping panel (input means),
13...Control device. Figure 3 Figure 40 5th EI

Claims (1)

[Claims] 1. An image of an original image placed on the document placement surface of a copying machine for plate making,
A first latent image is formed by exposing the photosensitive material supplied to the photosensitive material placement surface through the imaging optical system, and then the same photosensitive material is continuously fed to the photosensitive material placement surface for the required length. In a multi-surface exposure method in a plate-making copying machine configured to display images on multiple surfaces, scanning imaging using a document illumination light is performed between the document placement surface and the sensitive material placement surface, which are arranged parallel to each other. Scanning exposure is performed by moving the optical system forward a required distance from the origin position, and in response to the return movement of the scanning imaging optical system to the origin position, the sensitive material is fed by the distance of the backward movement of the optical system. A multi-sided exposure method for a plate-making copying machine characterized by