JPH01171794A - Sending-out and cutting method for rollike photosensitive material - Google Patents

Abstract

PURPOSE:To prevent generation of cutting chips and to cut a photosensitive material cleanly so as to enable image formation with high image quality by setting back a cutting member at the fore end on a roll side of the photosensitive material at the time of returning, in a specified amount to a position such that it does not touch a rotary cutter. CONSTITUTION:A photosensitive material is drawn out to a specified length with the running of a running head 522 from a core 402 thereof in a roll form. Next, a rotary cutter 514 is reciprocated along a lower edge 513 fixed substantially perpendicular to the photosensitive material. At the time of reciprocation of this rotary cutter 514, the photosensitive material is cut with the cooperation of the rotary cutter 514 and the lower cutter 513, and the cutter 514 is returned to its original point with the returning action. Prior to this returning action, it is sent out, and a reholding roller 511 is slightly rotated reversely so that a cutting member at the fore end on a roll 402 side of the photosensitive material is set back in a specified amount to a position where the member does not touch the rotary cutter 514. It is thus possible to prevent generation of cutting chips so as to enable image formation with high quality.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to the use of a photosensitive material in an image forming apparatus that pulls out a predetermined length from a roll of photosensitive material, cuts it into photosensitive material of a predetermined size, and forms an image by exposing an image from an original onto the photosensitive material. Concerning improvements in feeding and cutting methods.

[Conventional technology]

A device that projects an original image onto a photosensitive material using silver halide to form a color image by enlarging or reducing it at the same size.Provided as a copying device or plate inspection device under the product names Hakonica Color 7 and Konica Consensus. There is. In such devices, the original roll of photosensitive material is placed in a magazine and set in the device, and a predetermined amount is fed out and cut with a cutter to form sheets of photosensitive material of the required size at the exposure position. Scanning exposure or static exposure is performed. The cutter is compact, quiet, and can cut accurately and accurately.The lower blade is a fixed blade placed perpendicular to the conveying direction of the photosensitive material, and the rotary cutter rotates while engaging with the lower blade and moves forward. After cutting, the device is moved back and forth so that it waits at the original position again for cutting the next photosensitive material.

[Problems to be solved by the invention]

By using this cutting method, accurate and very clean cuts can be made quietly and relatively stably, but the cutting line of the preceding photosensitive material with the rotary cutter is even worse when the rotary cutter moves back. There is no problem because it is moving forward, but the leading edge of the subsequent photosensitive material waiting for the next feed has recovered the slack that was pressed down by the rotary cutter during cutting and is now slightly above the lower blade. Sometimes it sticks out and gets covered. If the cutter is moved back in this condition, a 1 to 2 mm wide area of the leading edge of the subsequent photosensitive material that covers the lower blade may be cut off, resulting in thin ribbon-shaped chips. . This is carried along with the subsequent repeated conveyance of the photosensitive material, and is burned into the photosensitive material when imagewise exposed at the exposure position, resulting in a blemish phenomenon, which significantly impairs the quality of image formation. An object of the present invention is to provide a method for feeding and cutting a roll-shaped photosensitive material, which solves the above-mentioned problems.

[Means for solving the problem] The purpose of this is to pull out a predetermined length of the photosensitive material from the original roll of the photosensitive material wound into a roll, and then fix the lower blade of the roller cutter almost at right angles to the photosensitive material. In a cutting method in which the photosensitive material is cut in the forward motion by moving along the forward motion and returned to the original position in the backward motion, the cut portion at the top of the roll side of the photosensitive material is placed at a position where it does not touch the row cutter during the backward motion. This is achieved by a method for feeding and cutting a roll-shaped photosensitive material, which is characterized in that it is moved back by a predetermined amount.

【Example】

A printing plate inspection apparatus employing the method of the present invention will be explained with reference to a front view in FIG. 1, a partial side view in FIG. 2, and a top view in FIG. However, the method of the present invention is not limited to this example. The printing plate inspection device checks whether there are any mistakes in the layout of the original film before creating the actual printing plate using each printing plate original 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 includes a document table 140 having an upper surface 141 and a lower surface 142 on which a document positioning pinper 143 is installed above the main body frame 101 supported by legs 102.
A light-shielding cover 120 is provided above the light-shielding cover 120, which can be freely opened and closed to form a dark room as a first room. 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 302A are installed.
, 302B, and 302G are provided surrounded by a drum-shaped internal reflecting mirror 306 fixed to a housing 316 and a transmission window 304. A polygonal tube 301 is rotatably provided on the outside thereof with filters such as B, G, R, ND arranged on each tube surface concentrically, and the filter surface and the transmission window are arranged on the contact exposure surface. They are meant to face each other. 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. 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, an endless light-shielding curtain 242 is used as a light-shielding member.
are applied to rollers 241, 242A, 243, 244, and an opening window having a size at least larger than the cross section of the moving area of the photosensitive material mounting table is formed in the substantially middle portion of the long portion. In such a light shielding member 240, the lower surface 142 of the document table is
By running the light-shielding belt on a slightly lower surface, that is, the boundary area between the first chamber and the second chamber, the light-sensitive material mounting table 201
It is provided so that the formation and release of light tightness from the second chamber containing the first chamber to the first chamber can be switched. The light-shielding belt 242 can move only when the photosensitive material mounting table is lowered to a position where it does not touch the light-shielding belt, which is a light-shielding member.The light-shielding belt 242 can only move up to the document position when the light-shielding curtain is opened. Only when you are Further, the light shielding member may be a simple sliding light shielding plate instead of an endless light shielding belt to satisfy the above-mentioned closing and opening conditions. However, in the present invention, as shown in FIG. 2, the light-shielding belt is moved in a direction (
In this embodiment, the direction is perpendicular. As a result, although the explanation will be omitted, the size of the entire printing plate inspection apparatus can be greatly reduced. 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 section 510 and are on standby. As shown in FIGS. 5 and 6, the cutter section 510 has a lower blade 513, which is longer than the maximum width of the photosensitive material, fixed in the vicinity of the running surface of the photosensitive material in a direction perpendicular to the direction in which the photosensitive material 402 is sent out. A rotary cutter 514 is provided, and the rotary cutter 514, which corresponds to the upper blade, travels with its rotary blade in contact with the lower blade, thereby making it possible to cut the photosensitive material 402 that is stopped on the lower blade. The movement of the cutter is carried out by a traveling table 515, which is pivoted so that the cutter can rotate, guided by a guide bar 516, and a guide roller 5 attached to the traveling table.
18 is guided by the guide rail 517, so that the circumferential blade of the row cutter is brought into contact with the lower blade 513. The traveling drive is performed by driving a chain 519 connected to the traveling base 515. Further, the rotation of the rotary cutter is obtained by the transmission of frictional force when it moves in contact with the lower blade, and no separate drive device is particularly provided. The leading edge of the photosensitive material at the cutter position is further fed to the left end of the fixing table 527 by the pinching roller 511 and placed on the suction cup 52.
At step 3, the tip is attracted, and the running head 522 having the suction cup moves its rollers 525 and 526 to a position where the rollers 525 and 526 are guided by the running rails 521 on both sides to measure a predetermined length of the photosensitive material and then stops. The rotary cutter 514 of the upper blade of the force/7ta part 510 rotates on the lower blade 513 to cut the photosensitive material, and further moves so that the tip of the photosensitive material is positioned at a predetermined position on the photosensitive material mounting table 201. Then, the rotary cutter runs backwards over the lower blade again and returns to its original position. After the suction of the suction cup of the traveling head 522 is cut off, the traveling head 522 also returns to its original position. Here, cutting by the rotary cutter is done in forward travel, but the photosensitive material is cut at the upper surface of the lower blade. Therefore, after cutting, the leading end of the photosensitive material may inevitably protrude beyond the lower blade because the photosensitive material slackens during cutting. Therefore, if the rotary cutter is returned to its original position in this state, a small amount of ribbon-shaped debris of about 1 to 2 mm will be produced. Therefore, it was necessary to prevent this, and a measure was taken to reverse the feed-out nipping roller 511 even slightly before the backward motion to return the cut portion of the photosensitive material onto the lower blade. The amount of return is suitably 2.0 mm or more and 2.5 mm or less. However, it is not limited to this. By adopting this method, problems such as defective image formation due to cutting debris have been completely eliminated. Now, the suction cup running head 522 has brackets 534 on both sides.
A solenoid 535 is attached to the movable core 536 of the solenoid 535, a frame 531 is fixed to the movable iron core 536, a suction cup 523 connected to a hose 524 is attached to the frame 531, and a suction cup 523 connected to a hose 524 is attached to the frame 531. Holding pipe 537
is provided through a guide hole drilled in the head 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 traveling head 522 and the frame 531. It floats above the exposure table surface via a helical spring 532 inserted therebetween. Then, when the solenoid is energized and the suction valve is opened, the suction cup descends and attracts the photosensitive material.
Thereafter, the solenoid is de-energized so that 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, the blower 204A is driven through the flexible hose 205 to apply suction pressure to the suction hole bored in the photosensitive material mounting table. The photosensitive material is tightly 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 the second chamber in which 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 peeled off, the first chamber is illuminated with external light, and the reference hole of the original (black version and one of MMC, for example, Y version) is inserted into the registration bin (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 and the first room is taken out to make it light-tight.The light-sensitive material mounting table is raised slightly below the surface of the light-shielding curtain belt, and then the light-shielding curtain belt 242 is moved to open it. The circuit is configured so that the light-shielding belt 242 does not move to open unless the light-shielding cover is completely closed. Then, with the first room containing the upper surface of the original table and the second room containing the photosensitive material mounting table becoming a common dark room, the photosensitive material mounting table::oi is raised to match the exposure surface, that is, the original reference surface. At this time, the airtight gasket 201c provided on the abutting surface around the photosensitive material mounting table in the second chamber is pressed against the document table 1 in the first chamber.
40, and the gap created by the insertion surface of the photosensitive material mounting table into the opening forms a suction channel groove 204.
Moreover, airtightness is maintained between the document table surface, the photosensitive material mounting table surface, and the document and photosensitive material sandwiched between the transparent cover sheet. 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 rails 281A and 281B and moves to the right in FIG.
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 a cover sheet, and when the head reaches the right end of the document table and is sunk below the top surface of the document table so as not to obstruct the movement of the exposure section, the brief 206 is activated. Through the suction hose 207, 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 flat shape. be done. 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. At this time, as shown in FIG.
The dimensional relationship between the abutting surface 201b, the airtight packing 201c attached thereto, and the lower surface 142 of the document table 140 is adjusted so that the upper surface 201a of the photosensitive material mounting table 201 is on the same plane. By doing this, air can flow smoothly between the transparent cover sheet, the document table and the photosensitive material mounting table through the flow channel grooves, and the cover sheet, document and photosensitive material can be placed in the correct flat shape. Close contact is achieved. 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 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) in the registration bin, cover it with a light-shielding cover, open the light-shielding curtain, and place the photosensitive material 111: Place the table on the original platen surface. The polygonal tube 301 is rotated, and the cylindrical surfaces provided on another filter are faced to each other, and scanning contact exposure is performed using a second color filter. Finish the second exposure. Similarly, the third original (black version and one of Y, M, and C, for example, 6th 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° is sent downward by 554, 555, 556; and then, by switching around the swinging shaft 568 of the switching chute 566, the rear end of the switching chute 566 is sent downward to the guide 564,565°567,568. are conveyed by guide rollers 556, 557, 558, and 559 and sent to the development processing section 600. And color developing tank 6
01, the exposure lamp 35 of the 28th light section 350
1 and filter device 352, reflecting plate 353°354, E
Fog exposure is performed by an exposure box 356 consisting of an X-light 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.
, 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 exposed photosensitive material begins to be conveyed through the conveyance chute section 550, the subsequent photosensitive material is transferred to the photosensitive material mounting table 2.
The process of being conveyed onto the 01, measured, cut by the cutter section 510, and set in close contact is repeated as described above. When using a light-sensitive material with internal latent image direct positive or color reversal, a second exposure is required, but when a negative color light-sensitive material is used, the second exposure is not necessary and the light is left off. Of course, regarding exposure to direct positive light-sensitive materials, each Y, M, and C version of the original is overlaid with a black version, and B is used for the Y version and the black version, and G is used for the M version and the black version. , the C plate and the black plate are exposed to light three times using corresponding R filters, but when exposing a negative color photosensitive material, each Y plate, M plate, and C plate original is placed on the photosensitive material. Alone ° and stacked Y
The edition is B. For the M plate and the G1C plate, an R filter was layered and exposed three times, and then a black plate was layered and exposed with an ND filter for the fourth time. 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. There are two types of photosensitive materials: those with high sensitivity and those without. When using a photosensitive material with low sensitivity, the exposure section 300
A plurality of light source lamps 302 of the polygonal tube 301 are provided and a large number of light source lamps 302 are turned on so that the exposure can be made more powerful. Although the above has been an embodiment of a printing plate inspection device incorporating the method of the present invention, this method can also be applied to a color copying device using a silver salt photosensitive material in exactly the same manner as the embodiment.

【Effect of the invention】

By adopting the method of the present invention, in the measurement cutting process of silver salt photosensitive materials in printing plate inspection devices and color copying devices,
This eliminates the generation of cutting debris, eliminates problems such as imprinting of cutting debris on images, and allows the photosensitive material sheet to be cut accurately and beautifully, thus realizing high-quality image formation.

[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. FIG. 5 is a front view of the row cri cutter section. FIG. 6 is a plan view of the rotary cutter section. 100... Printing plate inspection device main body 120...
... Light-shielding cover 140 ... Document table 141
...Top surface 142...Bottom surface 200
...Sensitive material mounting section 201...Sensitive material mounting table 201a...Top surface 201b...Abutting surface 201c...Airtight panokin 204...Suction channel Groove 215... Nozzle 240...
- Light shielding members 241.242A, 243.244...
...Roller 242...Shading curtain belt 270...Cover sheet device 275...Cover sheet 300...Exposure section 350...Second exposure section 400 ...
...Sensitive material loading section 510...Cutter section

Claims (1)

[Claims] A predetermined length of the photosensitive material is pulled out from the original roll of the photosensitive material wound into a roll, and the rotary cutter is moved along the lower blade fixed at almost right angles to the photosensitive material, thereby cutting the photosensitive material in forward motion. A cutting method in which the photosensitive material is cut and returned to its original position in a backward movement, characterized in that during the backward movement, the cut portion at the top of the roll side of the photosensitive material is moved back a predetermined amount to a position where it does not touch the rotary cutter. A method for feeding and cutting roll-shaped photosensitive materials.