JPH01136156A - Contact printing device capable of operation in light chamber - Google Patents

Abstract

PURPOSE:To obtain the title device which uses a small light source, and also, can execute a light chamber operation by placing an original through a light shielding curtain in the boundary area of a first chamber, opening the curtain, and simultaneously, advancing an exposing base to the boundary area, aligning and overlapping a photosensitive material and the original, and thereafter, operating an exposing and scanning part. CONSTITUTION:The title device is provided with the first chamber whose light-shieldness to an external light is turned ON/OFF by opening and closing a light shielding cover, and a second chamber so that a light shielding relation between both chambers is turned ON/OFF by opening and closing a light shielding curtain 242 provided on a boundary area to the first chamber. An exposing and scanning part 300 is provided on the first chamber, a photosensitive material is placed and fixed automatically to the second chamber, an exposing base 201 by which the placed photosensitive material surface can move to the boundary area is provided, the original is placed through the light shielding curtain 242 on the boundary area of the first chamber, and as soon as the curtain is opened, the exposing base 201 is advanced to the boundary area and the photosensitive material and the original are aligned and overlapped, and thereafter, the exposing and scanning part 300 is operated. In such a way, the printing device becomes compact, and operations for adherence of an original film to the photosensitive material, positioning and an original conversion can be executed quickly and surely at a light place.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for producing a direct positive or negative color photosensitive material by accurately placing each printing plate original that has been developed and finished by spectral exposure in a predetermined position. This invention relates to an improvement in an exposure device, which is a technology of printing each separated color multiple times to create a color image copy with the same color scheme as the finished print, and inspecting the final original for printing plate production for abnormalities.

[Conventional technology]

Conventionally, scanning exposure type exposure devices have used a method in which light source light is irradiated onto the document through a long and narrow slit window, and an image is formed on the photosensitive material using a projection lens with an enlargement or reduction function.The light source is generally a rod-shaped light source. A single light source was provided. The light source in this case has a smaller capacity and is more compact than the light source for static exposure. On the other hand, scanning exposure has not conventionally been used in contact exposure in which a document and a photosensitive material are overlapped and irradiated with light from a light source. By the way, in the plate inspection process, in order to check the correctness of multiple originals of printing plates for color printed matter using an exposure device, the originals are stacked one by one on a color photosensitive material and exposed sequentially to create an image with the same color tone as the printed material. , checking to see if it's working as intended.

Since the photosensitive material handled in such a process is covered by external light, the work was done in a dark room by groping.

[Problem that the invention seeks to solve]

As described above, when exposing an original such as a printing plate to a color photosensitive material multiple times, the reproducibility of halftone dots and color tone is better when the original is exposed in close contact than when it is projected with a lens. However, in the case of contact exposure, if static exposure is used as in the past, a large light source is required, which increases the size of the apparatus and the power consumption. Furthermore, since the photosensitive material being handled is covered by external light, the above-mentioned operations had to be carried out by hand in a completely dark room, which made workability extremely difficult. It is an object of the present invention to solve these problems and provide a contact exposure apparatus that uses a small light source and can be operated in a bright room.

[Failure to solve the problem]

The purpose of this is to enable or disable the light tightness between the first room and the outside light by opening and closing the light-shielding cover, and to turn on and off the light-tight relationship between the two rooms by opening and closing the light-shielding curtain installed in the boundary area between the first room and the first room. A second chamber is provided in the first chamber, an exposure scanning section is provided in the first chamber, and a second chamber is provided in the second chamber.
An exposure table is provided in which a photosensitive material is automatically placed and fixed in a chamber, and the surface of the placed photosensitive material is movable to a boundary area, and an original is placed in the boundary area of the first chamber through a light-shielding curtain. , wherein the curtain is opened and the exposure table is advanced to the boundary area to align and overlap the photosensitive material and the original, and then the exposure scanning unit is operated. achieved by the device.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A printing plate inspection apparatus equipped with an exposure apparatus according to an embodiment of the present invention will be explained with reference to a front view in FIG. 1, a side view in FIG. 2, and a top view in FIG. However, the present invention is not limited to this example.

The printing plate inspection device uses each printing plate original film color-separated into 0 version, M version, Y version, and sumi version to check whether there are any mistakes in the layout of the original film or if the colors are different before creating the actual printing plate. This device is used to check whether there are any errors or errors in characters, etc., and it positions the original film one by one and overlays it on a color photosensitive material for multiple contact exposure to create a color photograph in the same condition as the printed matter. , which allows errors in the printed version of the manuscript to be detected and corrective action taken in advance.

The main body part 100 has an upper surface part 140 having a surface 141 for installing a registration bin (pin bar) 143 for document positioning on the upper surface of the main body frame 101 supported by legs 102. A light-shielding cover 120 is provided that can be opened and closed to make it possible to form a dark room.

Further, an exposure section 300 is provided in the first chamber for scanning and exposing the contact exposure surface of the upper surface. At the center of the exposure section, one or more (three in this embodiment) tubular light source lamps 302A are installed.
, 302B, and 302C are provided surrounded by a drum-shaped internal reflecting mirror 306 fixed to a housing 316 and a transmission window 304. Then, on the outside thereof, a polygonal cylinder 301 is provided approximately concentrically with the center portion, with B and G on each cylinder surface.

A filter such as RSND is arranged and rotatably provided, and the filter surface and the transmission window face the contact exposure surface. A housing 316 is provided on the outside thereof, and includes a shielding plate 308, a solenoid 312 for operating the shielding plate, a return spring 314, and an exposure window 310.

Then, the exposure 5300 is made to be able to travel on the rails 317A and 317B for scanning.

Inside the main body frame 101, there is an exposure table part 2 as a second chamber.
00 is set. The exposure table 201 is moved vertically by a motor 214.

On the other hand, an endless light-shielding belt 242 is wrapped around rollers 241, 242A, 243, and 244, and a length of 7 is a complete light-shielding curtain, with an exposure window having a size larger than the cross section of the exposure table moving area. In such a light shielding curtain section 240, a surface slightly lower than the document positioning surface, that is, a first chamber and a second chamber.
By running the light-shielding curtain in the boundary area of the chamber, it is possible to switch between forming and releasing light from the second chamber in which the exposure table section 200 is housed to the first chamber.

Further, a long roll 402 of positive silver salt color photosensitive material is loaded into a magazine 401 to form a photosensitive material loading section 400, and the leading end of the long roll of photosensitive material is fed out by a nipping roller 511, are aligned at the cutter 510 and are on standby. Then, the clamping roller 511 is used to hold the fixing base 5.
The tip is fed to the left end of the photosensitive material 27 and is sucked by a suction cup 523, and a traveling head 522 having the suction cup guides its rollers 525 and 526 to the traveling rails 521 on both sides, and the predetermined length of the photosensitive material is It moves to the position where it is measured, stops, is cut by a cutter 510, and then moves to the exposure table 2.
The moving head 522 moves so that the leading end of the photosensitive material is located at a predetermined position 01, and after the suction of the suction cup of the running head is removed, the running head 522 returns to its original position.

Here, solenoids 535 are attached to both sides of the traveling head 522, a frame 531 is fixed to the movable iron core, and a hose 52 is attached to the traveling head 522 and the frame 531.
A suction cup 523 is attached to the suction cup 523, and a holding pipe 537 of the suction cup is provided to pass through a hole made in the head and frame, and the thrust direction is fixed to the frame. It is slidably installed along the hole and floats above the exposure table surface via a helical spring 532 inserted between the traveling head 522 and a frame 531. When the solenoid is energized, the suction cup descends through the frame and attracts the photosensitive material,
Thereafter, by returning the solenoid, the suction cup lifts up and the photosensitive material is conveyed.

When the photosensitive material is transported and placed on the exposure table 201 in this way, suction pressure is applied to the suction hole drilled on the exposure table by the drive of the blower 204 via the flexible hose 205, and the photosensitive material is It is tightly fixed on the exposure table.

In this state, the light-shielding curtain 242 is in a light-shielding position, so that the second chamber in which the exposure table is located remains in a state where a dark room is formed.

Here, pass through the upper light-shielding cover 120, brighten the first chamber with external light, and attach the registration pin (bin bar) 143 set on the upper surface part 141 to the reference hole of the original (one of the black plate and MMC, for example, Y plate). A large part of the document is placed on the light-shielding curtain.

In this state, the light-shielding cover 120 is closed to make the first room dark and light-tight, and the light-shielding belt 242 is moved to open it.

Then, with the first chamber containing the upper surface portion and the second chamber containing the exposure table portion forming a common dark room, the exposure table 201 is raised to match the exposure surface, that is, the document reference surface. At this time, the airtight cushion provided around the exposure table in the second chamber comes into close contact with the lower edge of the window into which the exposure table is inserted, which is formed in the upper surface part 140 of the first chamber, and the gap between the insertion part becomes the suction flow path. A groove 204 is formed to maintain airtightness between the upper surface, the exposure table surface, and the original and photosensitive material sandwiched between the transparent cover sheet.

Then, a transparent cover sheet roll 274 is wound around a shaft 273, and its tip passes through a squeeze roller 276 and is stopped by a stopper 272 at the head 2 of the cover sheet device 270.
71 is guided by the rails 281A and 281B to the second
Cover sheet roll 27 by moving to the right in the figure.
The cover sheet 275 that is unwound from the cover sheet 275 is pressed by a spring 278 and squeezed by a squeeze roller 276 which is rotatably fixed to a shaft 277, and the document and photosensitive material are covered with the cover sheet until the right end is reached by the head. The suction hose 207 is activated when the blower 206 is lowered below the surface of the document table so as not to obstruct the movement of the exposure section.
The air interposed between the exposure table, the upper surface, and the cover sheet is sucked through the flow path groove 204, and the photosensitive material, each document, and the cover sheet are stacked and held in close contact with each other in a planar shape. Note that the squeeze roller 276 is not provided in the cover sheet device, but is provided at the lower part of the exposure section 300, and the same effect is obtained.

In this state, the exposure section 300 is connected to the guide rail 317A.
, 317B to perform scanning exposure, and complete the first color exposure using the filter.

Next, in order to perform a second image exposure using a different color original and a different color filter, the cover sheet is returned to its original position, and the exposure table is lowered to a position slightly below the traveling path of the light-shielding curtain.
By blowing in air and closing the light-shielding curtain, the original and the photosensitive material can be easily and completely separated and removed.

The first room remains a bright room, but the second room is light denser than the first room, forming a dark room.

In this state, set the second original (a black plate, one of YSM, C, for example, M plate) in the registration bin, cover it with a light-shielding cover, raise the exposure table to the top, cover it again with the cover sheet, and apply suction. Then, each sheet is brought into close contact with each other, the polygonal cylinder 301 is rotated, and the cylinder surfaces provided on another filter are made to face each other, and scanning contact exposure is performed using a second color filter, and the second exposure is completed.

Similarly, the third original (a black plate and one of Y, M, and C, for example, a C plate) is exposed using the filter corresponding thereto, and the third exposure is completed.

Finally, the exposure table is lowered to the lowest position, the suction is released to release the photosensitive material, and the nipping roller 5
The leading end of the photosensitive material is fed into 52 using a device (not shown).

The photosensitive material whose tip has reached the nipping roller 552 is guided by the guides 561 , 562 , 563 of the conveyance chute section 550 .
, 564, 565, the switching chute 566, and the guide rollers 552, 553, 554, 555, 556, and then the switching chute 566 is switched around the pivot shaft 568 to move the previous rear end to the leading edge. Then, it is conveyed by guide rollers 556, 557, 558, 559 on guides 564, 565, 567° 568, and sent to the development processing section 600. While being transported through the color developing tank 601, the exposure lamp 3 of the second exposure section 350
51 and filter device 352, reflection plates 353, 354,
Fog exposure is performed by an exposure box 356 consisting of an exposure window 355. Then, it passes through a bleach-fixing tank and a stabilizing tank, and is transferred to a drying section 680 by a conveying roller 681.
．． At 682, the photosensitive material is slowly transported and dried, and the developed photosensitive material is collected at the right end of the apparatus.

It should be noted that as soon as the exposure section photosensitive material begins to be conveyed through the conveyance chute section 550, the following photosensitive material is transferred to the exposure table 201.
The process of being conveyed upward, measured, cut by the cutter 510, and set in close contact is repeated as described above.

When using an internal latent image type direct positive, the photosensitive material is the second
Although exposure is necessary, when using a negative color photosensitive material, the second exposure is not necessary and the light remains off.

Of course, regarding the exposure of direct positive light-sensitive materials, each Y, M, and C version of the original is overlaid with a blackout plate, and the Y, blackout, and B1M plates are covered with G and C. The printing plate and the blackout printing plate are exposed three times with corresponding R filters, but when it comes to exposing negative color photosensitive materials, each Y, M, and C plate original is individually applied to the photosensitive material. Overlap the Y plate with a B filter, the M plate with a G filter, and the C plate with an R filter and expose three times, then overlap the black plate for the fourth time and ND.
Exposure is done by matching the filter.

Note that the photosensitive material in the exposed area once enters the guide chute 565 and is then turned over and enters the developing device with the emulsion side facing up; however, it can also be placed in the developing device without entering the guide chute 565 by turning the knee as it is. , the light source position for the second exposure must be located above the developing device and below the photosensitive material transport path, which makes maintenance and installation somewhat difficult.
This is not very preferable because it requires an exposure window to be opened on the side of the developer tank, making it difficult to clean up leakage.

By the way, for example, if negative color is used as a photosensitive material,
When a fluorescent lamp is used as a light source, the sensitivity to R light may be very low. Therefore, in this case, the exposure section 300
A plurality of light source lamps 302 of the polygonal tube 301 are provided and a large number of them are turned on so that the R exposure can be made stronger.

In addition, by using the measures of lowering the scanning speed and the measures of making the opening/closing of the exposure window 310 variable, in combination or alone, it is possible to perform high-quality exposure without worsening the reciprocity law failure condition.

〔Effect of the invention〕

According to the present invention, the exposure device can be made compact and the original film of each printing plate can be brought into close contact with the photosensitive material during multiple exposure.
Positioning and document conversion operations can now be performed quickly and reliably in bright light, making it possible to accurately inspect documents without damaging the document or photosensitive material.

[Brief explanation of the drawing]

FIG. 1 is a front view of a printing plate inspection device equipped with an exposure device of the present invention. FIG. 2 is a front view of the exposure apparatus of the present invention. FIG. 3 is a top view of the printing plate inspection apparatus shown in FIG. 1. 100----mm printing plate inspection device main body 120-1-・
- - Light-shielding cover 140 - - - - Main body upper surface part 200 - - - - Exposure stage part 215 - - - - Nozzle 240 - - - - Light-shielding curtain part 270 - - - - - - - - - - - - - One cover sheet Apparatus 300-----1 Exposure section 350--1 Second exposure section 400--1 Sensitive material loading section 510--1 Sensitive material cutting section 520--1 Sensitive material conveying section 550 --- One sensitive material conveying chute section 600 ---
-1 development processing section 680--1 drying section

Claims (1)

[Claims] A first chamber in which light tightness with outside light is turned on and off by opening and closing a light blocking cover, and a second chamber in which light tightness between both rooms is turned on and off by opening and closing a light blocking curtain provided in a boundary area between the first room and the first room. an exposure scanning section is provided in the first chamber, an exposure table is provided in the second chamber on which the photosensitive material is automatically placed and fixed, and the surface of the placed photosensitive material is movable to the boundary area; A document is placed in the boundary area of the chamber through a light-shielding curtain, the curtain is opened, and the exposure table is advanced to the boundary area to align and overlap the photosensitive material and the document, and then the exposure scanning section is activated. A contact exposure device that can be operated in a bright room.