JPH01161351A - Contact exposing device for multiexposure - Google Patents

Abstract

PURPOSE:To accomplish adhesion in the multiexposure of original film, positioning and the conversion of an original quickly and surely in a bright atmosphere by providing plural tapered pins and a fitting tapered pin. CONSTITUTION:The title device comprises an original platen 140 which possesses an aperture part 144 opened from a front surface 14 to a rear surface 142, and the surface 141 is provided so that an original placing location can be positioned, and a shielding member provided so as to open and close freely along the rear surface 142; a hitting surface 201b capable of ascending and hitting the rear surface 142 when the surface 201b ascends and fits in the opening part 144 of the original platen 140; a surface 201d fitted into the opening part 144, and a material placing table 201 positioning and placing photosensitive material on its front surface. The material placing table 201 is positioned vertically and horizontally with plural tapered pins 209 provided either on the original platen rear surface 142 or the hitting surface 201b and a fitting tapered pin hole 146 provided on the remaining surface. Thus, such a small-sized contact exposing device can be obtained that can overlap an original and photosensitive body safely and correctly to expose them, and moreover can be operated in a bright room.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is a method for placing each printing plate original, which has been subjected to decomposition exposure and development finishing, in a predetermined position and printing each original onto a positive color or negative color photosensitive material. A contact exposure device for multiple exposure is one of the technologies that directly inspects the final document for printing plate creation for abnormalities by repeatedly exposing it multiple times to create a color image copy with the same color scheme as the print finish. Regarding improvements.

[Conventional technology]

Conventionally, exposure devices have two methods: one method is to irradiate light source light onto the document surface and form an image on the photosensitive material using a projection lens that has the function of enlarging, reducing, or equal magnification, and the other method is to overlap the document and photosensitive material and irradiate the light source light. There was a method that involved close exposure.

Furthermore, there are scanning exposure and static exposure methods for irradiating light source light, and the former requires a small light source to create a compact exposure apparatus, while the latter requires a fairly large light source, resulting in a large exposure apparatus.

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 sequentially exposed to light to create an image with the same color tone as the printed material. We are creating a system and inspecting it to see if it is working as intended.

The exposure equipment used in such processes uses a projection lens, and although it is quite large, it is possible to work in a bright room.

On the other hand, with the contact exposure method, until now it has not been possible to operate in a bright room for photosensitive materials such as color photosensitive materials, which have a photosensitive region in the entire visible range, and they have been forced to fumble around in a dark room. was. However, the reproducibility of halftone dots and color tones is better with the contact exposure method.

[Problem that the invention seeks to solve]

As mentioned above, when exposing each printing plate's original to the same color photosensitive material multiple times, there are two methods: projection using a lens and contact exposure, but the latter provides better reproducibility of halftone dots and tones. . However, in this case, if static exposure is performed, the light source device will be large and the power will also be large.

Furthermore, although contact exposure has excellent quality performance, workability is poor if it involves operations in a darkroom as in the past.

Therefore, it is necessary to downsize the device and work in a bright room.

Further, the original and the photosensitive material must be placed on the exposure surface in a properly flat and close contact manner.

In order to do this, it is necessary to provide a suction device on the surface of the original table and the photosensitive material mounting table on which the original and photosensitive material are placed to maintain the flatness of the original and the photosensitive material.
A more important point is that the photosensitive material mounting table must always be positioned with the same relative dimensions with respect to the document table for each exposure in multiple exposures. Without such placement, exposure deviation will occur.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a compact contact exposure apparatus for multiple exposure, which can safely and correctly expose a document and a photosensitive material, and which can be installed in a bright room.

[Means for solving problems]

・This purpose is to provide a document table with an opening from the top surface to the bottom surface, the top surface of which can be positioned to place a document, and a light-shielding member that can be opened and closed along the bottom surface; A photosensitive material holder that is movable up and down, has a surface that abuts against the lower surface and a surface that fits into the opening when the light shielding member is opened, and has a surface that abuts against the lower surface and a surface that fits into the opening when the light shielding member is opened, and that the photosensitive material is positioned and placed on the upper surface. The photosensitive material mounting table has a mounting table, and a plurality of taper pins provided on either one of the lower surface of the document table and the abutting surface of the photosensitive material mounting table and fitting taper pin holes corresponding to the taper pins provided on the other side allow the photosensitive material mounting table to be This is achieved by a contact exposure device for multiple exposure, which is characterized by being able to perform positioning in the vertical and horizontal directions.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A printing plate inspection apparatus equipped with a old tube exposure apparatus according to a one-shot embodiment of the present invention will be described with reference to a front view in FIG. 1, a side view in FIG. 2, and a top view in FIG. 3. However, the present invention is not limited to this example.

The printing plate inspection device checks whether there are any errors in the layout of the original film before creating the actual printing plate using each printing plate manuscript film and film color-separated into 0, M, Y, and black plates. This device is used to check for color differences, character errors, etc., and it positions the original film one by one and overlays it on a color photosensitive material for multiple contact exposure to produce a color photograph in the same condition as the printed matter. The system was created so that errors in the printed version of the manuscript could be found, and actions could be taken to correct the manuscript in advance.

The main body 100 has a Kf+i stand 140 having an upper surface 141 and a lower surface 142 for installing a document positioning pinper 143 on the upper side of the main body frame 101 supported by legs 102, and a dark room serving as a first room is provided above the Kf+i stand 140. A light shielding cover 120 that can be formed is provided so as to be openable and closable.

Further, an exposure section 300 for scanning and exposing the contact exposure surface of the document table is provided in the first chamber. At the center of the exposure section, one or more (three in this embodiment) tubular light source lamps 302 are installed.
A, 302B, and 302C are provided surrounded by a drum-shaped internal reflecting mirror 306 fixed to a housing 316 and a transmission window 304. A polygonal cylinder 301 is rotatably provided on the outside of the cylinder concentrically with filters B, G, R, ND, etc. disposed on each cylinder surface, and the filter surface and the transmission window are connected to the contact exposure surface. += Toward! &It's like that. And, on the outside thereof, there is a shielding plate 308, a solenoid 312 for operating it, a return spring 314, and an exposure window 31.
A housing 316 is provided having a value of 0. The exposure section 300 can run on the rails 317A and 317B for scanning.

A photosensitive material mounting section 200 is provided inside the main body frame 101 as a second chamber. And the sensitive material mounting table 201 is
It is driven by a motor 214 and can be moved up and down.

On the other hand, as a light-shielding member, an endless light-shielding belt 242 is wrapped around rollers 241, 242A, 243, 244, and the length 7 is a complete light-shielding curtain, and then at least a photosensitive material is placed approximately in the middle of the length 7. An exposure window with a size larger than the cross section of the movement area of the table l is opened. In such a light-shielding member 240, the light-shielding belt runs on a surface slightly lower than the lower surface 142 of the document table, that is, the boundary area between the first chamber and the second chamber. The first chamber is provided so as to be able to switch between forming and releasing light tightness 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, and the leading end is are aligned at the cutter 510 and are on standby. Furthermore, the fixing base 52 is
The leading end is fed to the left end of the photosensitive material 7 and is sucked by a suction cup 523, and the 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 moved to the position where it was measured and stopped, and was cut by the cutter 510, and further moved so that the tip of the photosensitive material was located at a predetermined position on the photosensitive material mounting table 201, and the suction cup of the traveling head was cut. Above,
The running head 522 returns to its original position.

Here, solenoids 535 are attached to both sides of the traveling head 522 via brackets 534, and the movable iron core 53
A frame 531 is fixed to 6, and the traveling head 522,
A suction cup 5 coupled to the hose 524 on the frame 531
23 is attached to the suction cup (7) Holding high-1,53
71 is provided through a guide hole drilled in the RAD and frame, is fixed to the frame in the thrust direction, is installed in the head so as to be slidable along the hole, and is connected to the running head 522 and the frame. It floats above the surface of the exposure table via a helical spring 532 inserted between 531 and 531. When the solenoid is energized and the suction valve is opened, the suction cup descends to attract the photosensitive material, and then, when the solenoid is de-energized, the suction cup lifts up and the photosensitive material is conveyed.

When the photosensitive material is transported and placed on the photosensitive material mounting table 201 in this manner, suction pressure is applied to the suction hole made on the photosensitive material placing table by driving the blower 204A through the flexible hose 205. The photosensitive material is closely fixed on the photosensitive material mounting table.

This tightly fixed state is maintained until multiple exposures are completed and the photosensitive material begins to be transported to the developing section.

Furthermore, in this state, the light-shielding curtain 242 is in a light-shielding position, so that room @2, where the photosensitive material mounting table is located, remains in a state where a dark room is formed.

Here, the upper light-shielding cover 120 is passed through, the first chamber is brightened with external light, and the reference hole of the original (one of the black version and MMC, for example, Y version) is inserted into the registration pin (pin bar) 143 set on the upper surface part 141. 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 a dark room, making it light-tight, and after raising the photosensitive material mounting table to a position slightly below the light-shielding belt, the light-shielding belt 242 is moved to open it. Then, in a state where both the first room with the upper surface of the document table and the second room with the photosensitive material placement table become a common dark room, the photosensitive material placement table 2 is raised to substantially coincide with the exposure surface, that is, the document reference surface. At this time, the tip tapered portions 209a of the plurality of (two) guide taper pins 209 provided on the abutment surface 201b around the photosensitive material mounting table in the second chamber are inserted into the positioning taper pin holes 146 provided on the lower surface 142 of the document table 140. The light-sensitive material mounting table 201 is accurately positioned by fitting at the tapered portion. In other words, variations in position due to backlash when the photosensitive material mounting table 2 is raised are completely absorbed. Then, the airtight gasket 20IC provided on the abutment surface 201b around the photosensitive material mounting table in the second chamber is connected to the document table 140 in the first chamber.
The gap formed by the insertion surface 201d of the photosensitive material mounting base into the opening 144 forms a suction channel groove 204, and the space between the document table surface, the photosensitive material mounting base surface, and the transparent cover sheet is in close contact with the lower surface 142 of the paper sheet. The airtightness between the original document and the photosensitive material is maintained.

That is, 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.
71 is guided by the rails 281A and 281B and moves to the right of the second section, so that the cover sheet roll 274
The cover sheet 275 to be unwound is pressed by a spring 278 and the squeeze roller 2 is rotatably fixed to a shaft 277.
76, the original and the photosensitive material are covered with the cover sheet, and when the cover sheet reaches the right end, the blower 206 is activated, and the document and the photosensitive material are sucked through the passage groove 204 via the suction hose 207 and transferred to the exposure table. The air present between the upper surface portion and the cover sheet is sucked, and the photosensitive material, each document, and the cover sheet are stacked and held in close contact with each other in a planar shape.

At this time, as shown in FIG.
There is a slight step difference Δ between the upper surface 201a of the photosensitive material mounting table 2, and
The abutment surface 201b, the airtight gasket 201c attached thereto, and the lower surface 14 of the document table 140 so that H is generated.
The dimensional relationship between the two was adjusted. By doing this, air can flow smoothly between the transparent cover sheet, the document table and the photosensitive material mounting table through the flow path grooves,
Correct planar adhesion can be achieved without causing deformation to the cover sheet, document, and photosensitive material. ΔH
A suitable value is 0.05 to 0.3 mm.

In this state, the exposure section 300 is connected to the guide rail 317A.
, 317B to perform scanning exposure, and the first 7
Finish 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 photosensitive material mounting table is lowered to a position slightly below the travel path of the light-shielding curtain.
15 or by switching the blowing side of the blower 206 to blow air into the flow path groove 204 and then closing the light shielding curtain, the original and the photosensitive material can be easily and completely separated. When the light-shielding cover 120 is opened, the first room becomes a bright room, but the second room is light-dense compared to the first room, forming a dark room. In this state, set the second original (black version and one of Y, M, and C, for example, M version) on the registration pin, cover it with a light-shielding cover, and then
Open the light-shielding curtain, raise the photosensitive material mounting table to the original platen surface, cover the cover sheet again, apply suction, make each sheet stick together, and turn the polygonal tube 301 to make the tube surface provided on another filter face the first one. Scanning contact exposure is performed using the second color filter, and the second exposure is completed.

Similarly, the third original (black version and one of YSM and C, for example, 0 version) is exposed using the filter corresponding thereto, and the third exposure is completed.

Finally, the photosensitive material mounting table is lowered to the lowest position, the suction is released to release the photosensitive material, and the tip of the photosensitive material is fed to the nipping roller 552 by a device (not shown).

The photosensitive material whose tip has reached the nipping roller 552 is guided by the guides 561, 562, 563, 56 of the conveyance chute section 550.
4.565 and switching chute 566 and guide roller 5
52,553° 554.555.556, and then the swinging shaft 5 of the switching chute 566
By switching around 68, the guide roller 5 moves on the guide 564.565° and 567.568, starting from the rear end of the previous guide.
56, 557, 558, and 559 to the developing processing section 60(). While being transported through the color developing tank 6, fog exposure is applied by an exposure box 356 consisting of an exposure lamp 351, a filter device 352, a reflector 353, 354, and an exposure window 355 of the second exposure section 350. .

The photosensitive material then passes through a bleach-fixing tank and a stabilizing tank, and is dried while being slowly transported through a drying section 680 by transport rollers 681 and 682, and the developed photosensitive material is collected at the right end of the apparatus.

Incidentally, as soon as the exposed photosensitive material begins to be conveyed through the conveyance chute section 55θ, the subsequent photosensitive material is transferred to the photosensitive material mounting table 2.
The process of being conveyed onto 01, measured, cut by 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, it is a direct positive photosensitive material! = For the exposure, a black plate is overlaid on each Y, M, and C version of the original, and B is used for the Y and black versions, G is used for the M version and the black version, and G is used for the C and black versions. The image is exposed three times using an R filter, but when exposing a negative color photosensitive material, each Y, M, and C version of the original is individually superimposed on the photosensitive material.
The 81M plate is exposed with a G filter, and the C plate is exposed with an R filter three times, and then a black plate is layered and exposed with an ND filter for the fourth time.

Note that the photosensitive material in the exposure section) enters the guide chute 565, is turned over, and enters the developing device with the emulsion side facing up.
Although it is possible to make a knee turn and enter the developing device without entering the guide chute 565, the light source position for the second exposure must be placed from above the developing device to below the photosensitive material conveyance path, which makes maintenance and installation somewhat difficult. This is difficult and requires an exposure window to be opened on the side of the developer tank, which is not very preferable since it is difficult to clean up leakage.

There are two types of photosensitive materials: those with high sensitivity and those without. When using a photosensitive material with low sensitivity, the exposure area 30
A plurality of light source lamps 302 are provided in the polygonal cylinder 301, and a large number of light source lamps 302 are turned on so that the exposure can be made more powerful.

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, and the suction effect works smoothly to form images equivalent to printed matter without damaging the document or photosensitive material, allowing for accurate document inspection. Now I can do it accurately.

[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. FIG. 4 is a side sectional view showing the positional relationship between the document table and the photosensitive material mounting table. 100... Printing plate inspection device main body 120... Light-shielding cover 140... Original table 1
41...Top surface 142...Bottom surface 144.
・Opening 146 ・Positioning hole 200・
...Sensitive material mounting section 201...Sensitive material mounting table 201a
...Top surface golb...Abutment surface 20
1c...Airtight packing gild...Fitting surface 20
4...Suction channel groove 209...Taper pin 20
9a... Taper portion 215... Nozzle 240... Light shielding member 242... Light shielding belt 270...
Cover sheet device 275...Cover sheet 300...
-Exposure section 350...second exposure section 400...
-Sensitive material loading section 510...Sensitive material cutting section 520...
-Sensitive material transport section 55G...Sensitive material transport chute section 600...Developing and processing section 680...Drying section ΔH
···Step

Claims (1)

[Claims] a document table having an opening formed from the top surface to the bottom surface, the top surface being provided to enable positioning of a document to be placed, and a light-shielding member provided along the bottom surface so as to be openable and closable; A light-sensitive material mounting table is provided with an abutment surface of the lower surface and a surface that fits into the opening when the light-shielding member is raised and fitted into the opening of the document table, and a photosensitive material is positioned and placed on the upper surface; A plurality of taper pins provided on one of the lower surface of the document table and the abutment surface of the photosensitive material mounting table and fitting taper pin holes corresponding to the taper pins provided on the other side allow the vertical and horizontal directions of the photosensitive material mounting table to be adjusted. A contact exposure device for multiple exposure, characterized in that positioning can be performed.