JP2684043B2 - Multiple exposure system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is directed to a printing finish by positioning the color-separated original film of each printing plate a plurality of times and overprinting it on a direct positive or negative color photosensitive material. Among the techniques for making a color image copy having the same color arrangement as the above and inspecting the final document for making a printing plate for abnormalities, the present invention relates to improvement of an exposure device. [Prior Art] Conventionally, a photosensitive material is fixed and placed on a contact exposure table, and a document film is positioned on the contact exposure table and adhered by suction or the like, and after exposure, a suction cup is applied to the film and lifted on the exposure table. The operation of peeling from the photosensitive material was performed. Further, in order to prevent the deviation of the finished image formed by superposing and exposing a plurality of color-separated originals once on the same photosensitive material, a pin bar positioning system is used as a resist pin. That is, the positioning reference hole formed at a common predetermined position of each document is fitted to the pin of the pin bar which is fixed at a specific position in advance to maintain the correct positioning. [Problems to be Solved by the Invention] In order to replace the color separation original film after contact exposure, the exposure table on which the photosensitive material is fixed is moved in the direction opposite to the direction of the color separation original film with respect to the photosensitive material, and the color is separated. If you try to separate the disassembled original film and the photosensitive material,
Since only one end of the color separation original film is a pin bar, the edge on the opposite side is still in close contact with the photosensitive material.For this reason, the color separation original film and the photosensitive material cannot be separated completely, It was not easy to replace the disassembled original film. For example, if you try to replace the color separation original film by suction with a suction cup, the suction will not be performed reliably and the suction cup will come off from the color separation original film. In some cases, the suction cup may come off from the color separation original film due to the resistance between the photosensitive material and the end of the color separation original film that is fixed by the pin bar. An object of the present invention is to improve such problems, to reliably separate the color separation original film from the exposed light-sensitive material, and to easily replace the color separation original film. [Means for Solving Problems] The purpose is to bring a photosensitive material suction-fixed to an exposure table and a color separation original film whose one end is positioned by a resist pin into close contact with each other, and then expose the exposure table. The color separation original film is moved in the opposite direction with respect to the photosensitive material, and an endless belt is run between the photosensitive material suction-fixed to the exposure table and the color separation original film to move the photosensitive material and the color. The multiple exposure apparatus is characterized in that the operation of separating the separated original film is performed a predetermined number of times for each color separated original film. [Embodiment] A printing plate inspection apparatus equipped with an exposure apparatus according to an embodiment of the present invention will be described with reference to the front view of FIG. 1, the side view of FIG. 2 and the top view of FIG. However, the present invention is not limited to this embodiment. The printing plate inspection device uses the original films for each printing plate that have been color-separated into the C plate, M plate, Y plate, and Sumi plate to make sure there is no mistake in the layout of the original film before making the actual printing plate This is a device for inspecting whether there is any error in the characters, etc., position the original films one by one, overlay them on the color photosensitive material and perform multiple contact exposure to create a color photograph in the same state as the printed matter. , It is designed to detect an error in the manuscript for the printing plate so that an action to correct the manuscript can be taken in advance. The main body 100 is a main body frame 10 supported by legs 102.
Registration pin (pin bar) for document positioning on top of 1
A light blocking cover 120 capable of forming a dark room is provided on the upper surface portion 140 having a surface 141 on which the 43 is installed and which can be opened and closed. Further, an exposure unit 300 for scanning and exposing the contact exposure surface of the upper surface is provided. At the center of the exposure section, one or a plurality (three in the embodiment) of tubular light source lamps 302A, 302B, 302C are fixed to a casing 316, and a drum-shaped inner reflection mirror 306 and a transmission window.
It is surrounded by 304. A polygonal cylinder 301 is concentrically provided on the outer side of the central part and rotatably provided by disposing filters such as B, G, R and ND on each cylinder surface, and the filter surface and the transmission window are provided on the contact exposure surface. I'm facing each other. A housing 316 having a shielding plate 308, a solenoid 312 for operating the shielding plate 308, a return spring 314, and an exposure window 310 is provided on the outside thereof. The exposure unit 300 can run on the rails 317A and 317B for scanning. An exposure table section 200 is provided inside the main body frame 101. The exposure table 201 is driven by a motor 214 so that it can move up and down. On the other hand, the endless blackout curtain belt 242 has rollers 241, 242A,
Half of the length is hung on 243, 244, and a full blackout curtain is provided, and an exposure window having the size of the cross section of the exposure table moving area is opened at the center of the half length of the screen. . In such a light-shielding curtain portion 240, the light-shielding curtain travels on a surface slightly lower than the document positioning surface so that formation and release of the dark room of the exposure table 200 can be switched. Further, a long roll 402 of a positive type silver salt color photosensitive material is loaded in a magazine 401 to form a photosensitive material loading portion 400, and the leading end of the long roll of photosensitive material is sent out by a nipping roller 511, and a leading end portion thereof. Waits in line with the cutter 510. Then, the nipping roller 511 further feeds the tip to the left end of the fixed base 527, and the suction cup 523 adsorbs the tip,
The traveling head 522 having the suction cup moves its rollers 525 and 526 to the traveling rails 521 on both sides to a position where a predetermined length of the photosensitive material is measured and stops, and the cutter 510 cuts it, and further the exposure table 201 is exposed. The photosensitive material is moved so that the front end of the photosensitive material is located at a predetermined position, the suction cup of the traveling head is cut off, and then the traveling head 522 returns to the original position. Here, a solenoid 535 is attached to both sides of the traveling head 522, a frame 531 is fixedly mounted on a movable iron core of the traveling head 522, and a suction plate 523 connected to a hose 524 is attached to the traveling head 522 and the frame 531. The holding pipe 537 is provided so as to penetrate through a hole formed in the head and the frame, the thrust direction is fixed to the frame, and the head is slidably installed along the hole and the running head 522. Spiral spring inserted between frames 531
It rises from the exposure table surface via 532. When the solenoid is energized, the suction cup descends to adsorb the photosensitive material, and then the solenoid is returned to lift the suction cup to convey the photosensitive material. When the photosensitive material is conveyed and placed on the exposure table 201 in this way, the blower 204 is passed through the flexible hose 205.
Is applied, a suction pressure is applied to the suction hole formed on the exposure table, and the photosensitive material is fixed in close contact with the exposure table. In this state, the light-shielding curtain 242 is in the light-shielding position, so that the exposure table remains in the state where the dark room is formed. Here, the upper light-shielding cover 120 is passed through, and a resist pin (pin bar) 143 set on the upper surface portion 141 is inserted into a reference hole of a document (one of the Sumi plate and the YMC, for example, the Y plate), and most of the document is described above. Place it on the blackout curtain. In this state, the light blocking cover 120 is closed, and the light blocking curtain belt 242 is moved and opened. Then, the exposure table 201 is raised in a state where a dark room common to the upper surface portion and the exposure table portion is made to coincide with the exposure surface, that is, the original reference surface. At this time, the airtight cushion provided around the exposure table is in close contact with the lower surface edge portion of the exposure table fitting window opened in the upper surface portion 140, and the clearance of the fitting portion forms the suction flow channel groove 204, and Airtightness is maintained between the original and the photosensitive material sandwiched between the upper surface and the exposure table surface and the transparent cover sheet. Then, the transparent cover sheet roll 274 is wound around the shaft 273, and the leading end of the transparent cover sheet roll 274 is passed through the squeeze roller 276, and the head 271 of the cover sheet device 270 stopped by the stopper 272 is connected to the rail 281.
A, the cover sheet 2 being unwound from the cover sheet roll 274 by being guided to the right in FIG.
75 is pressed by a spring 278 and squeezed by a squeeze roller 276 rotatably fixed by a shaft 277, and the original and the photosensitive material are covered with a cover sheet, and the head reaches the right end of the original table and the exposure section moves. The blower 206 works where it is sunk below the original table surface so as not to straddle the suction table, and the suction hose 207 is sucked through the flow path groove 204 and the air existing between the exposure table and the upper surface and the cover sheet is sucked. The photosensitive material, the originals, and the cover sheet are overlapped and closely held in a planar shape. It should be noted that the squeeze roller 276 is not provided in the cover sheet device, but a means for providing the squeeze roller 276 in the lower portion of the exposure unit 300 is also implemented to obtain the same effect. Then, in this state, the exposure unit 300 becomes the card rails 317A and 317B.
The scanning exposure is performed by traveling above, and the first color exposure by the filter is completed. Next, in order to perform the second image exposure using the original of another color and the filter of another color, the cover sheet is returned to its original position and the exposure table is lowered to a position slightly below the path of the light-shielding curtain.
By blowing air and closing the light-shielding curtain, the original and the photosensitive material can be completely separated and removed easily. In this state, set the second document (Sumi plate and one of Y, M, and C, for example, M plate) on the resist pin, cover the light-blocking cover, raise the exposure table to the upper surface, cover the cover sheet again, and remove suction. Then, the sheets are brought into close contact with each other, the polygonal cylinder 301 is rotated, and the cylindrical surfaces provided in another filter are opposed to each other to perform scanning contact exposure by the second color filter, and the second exposure is completed. Similarly, exposure by the third original (Sumi plate and one of Y, M, and C, for example, C plate) and the filter corresponding thereto is also performed in the same procedure, and the third exposure is completed. Finally, lower the exposure table to the lowest position, release the suction of the contact state of the photosensitive material, and release the nip roller.
The tip of the photosensitive material is fed to 552 by a device (not shown). The photosensitive material, the tip of which has reached the nip roller 552, is fed downward by the guides 561, 562, 563, 564, 565 of the transfer chute unit 550, the switching chute 566 and the guide rollers 552, 553, 554, 555, 556, and is then switched around the swing support shaft 568 of the switching chute 566. Guide rollers 564,565,567,568 with the rear end up to the top as guide rollers 556,557,558,559
And is sent to the development processing unit 600. Then, while being transported in the color developing tank 601, the exposure lamp 351 of the second exposure unit 350, the filter device 352, the reflection plates 353 and 354, and the exposure window 3 are provided.
The fogging exposure is performed by an exposure box 356 composed of 55. Then, the photosensitive material passes through the bleach-fixing tank and the stabilizing tank, is dried while being slowly conveyed by the conveying rollers 681 and 682 through the drying section 680, and the photosensitive material after the development processing is collected at the right end of the apparatus. Incidentally, after the photosensitive material is started to be conveyed in the conveying chute section 550, the following photosensitive material is conveyed onto the exposure table 201, measured and cut by the cutter 510, and then a step of closely setting is performed. , As described above. The photosensitive material requires the second exposure when the internal latent image type direct positive is used, but when the negative color photosensitive material is used, the second exposure is not necessary and is kept off. As a matter of course, regarding the exposure to the direct positive photosensitive material, the sum plates are overlaid on the originals of the Y plate, the M plate, and the C plate, respectively, and B for the Y plate and the S plate, and G for the M plate and the S plate. , C
The plate and the stencil plate are exposed three times with the R filter corresponding to each other. For the exposure to the negative color light-sensitive material, the respective light sources of the Y plate, the M plate, and the C plate are independently exposed. The Y plate is overlaid with B filter, the M plate is overlaid with G filter, and the C plate is overlaid with R filter for three times, and the fourth overlaid with Sumi plate for exposure with corresponding ND filters. The light-sensitive material of the exposure agent once enters the guide chute 565, flips over, and enters the developing device with the emulsion surface facing up. However, without entering the guide chute 565, you can turn it as it is and insert it into the developing device. The light source position for the second exposure must be provided from above the developing device by the photosensitive material conveyance path, maintenance and installation are somewhat difficult, and an exposure window must be opened on the side of the developing tank, and liquid leakage can occur. It is not preferable because it is difficult to clean. Further, by using the treatment for lowering the scanning speed and the treatment for changing the opening / closing of the exposure window 310 in combination or alone, it is possible to perform high-quality exposure without deteriorating the failure condition on the reciprocal side. EFFECTS OF THE INVENTION According to the present invention, the operation of replacing the color separation original film in the multiple exposure of the color separation original film of each printing plate on the photosensitive material can be easily performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a printing plate inspection apparatus equipped with an exposure apparatus 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. 100 ... Printing plate inspection device main body 120 ... Shading cover 140 ... Main body upper surface 200 ... Exposure base part 215 ... Nozzle 240 ... Shading curtain part 270 ... Cover sheet device 300 ... Exposure part 350. 2 Exposure unit 400 ... Sensitive material loading unit 510 ... Sensitive material cutting unit 520 ... Sensitive material transport unit 550 ... Sensitive material transport chute unit 600 ... Development processing unit 680 ... Drying unit

   ────────────────────────────────────────────────── ─── Continuation of front page    (56) Reference JP-A-59-60432 (JP, A)                 Actual development Sho 48-14244 (JP, U)

Claims (1)

(57) [Claims] The photosensitive material suction-fixed to the exposure table and the color separation original film whose one end is positioned by the resist pin are brought into close contact with each other, and after exposure, the exposure table is perpendicular to the surface of the photosensitive material, In addition, the color separation original film is moved in a separating direction, and an endless belt is made to travel between the photosensitive material suction-fixed to the exposure table and the color separation original film to separate the photosensitive material and the color separation. A multiple exposure apparatus, wherein the operation of separating the original film is performed a predetermined number of times for each color separation original film.