JPS6269270A - Method and device for contact printing of photosensitive material - Google Patents

Abstract

PURPOSE:To improve position precision by blowing air to a photosensitive material at least nearby a positioning pin from the mounting of the photosensitive material on a negative plate to the start of the spreading of a flexible sheet over the photosensitive material. CONSTITUTION:When the photosensitive material 90 is mounted on the negative plate 88, a carrier 14 is elevated to a position A shown by an alternate long dash and two short dashes line and stopped. Air is blown from a nozzle 86 continuously throughout said period, then a rubber sheet roller 34 and a squeeze roller 38 are run as shown by arrows to spread and extend a rubber sheet 36 over the photosensitive material 90, and the air between the glass plate 36 and rubber sheet 36 is discharged by a discharge part 48 to bring the negative plate 88 and photosensitive material into contact with each other. The photosensitive material nearby the positioning pin is pressed by blowing the air, so even when the flexible sheet is extended from an end part of the photosensitive material on the side of the positioning pin, there is no hindrance to the expansion of the flexible sheet and the positioning pin is prevented from coming out of the pinhole of the photosensitive material.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a contact printing method for photosensitive materials in which an image of an original plate is printed onto a photosensitive material such as a printing plate, and a contact printing apparatus for photosensitive materials used to carry out this method. This is a contact printing device with an automatic material supply mechanism, which is effective for M. [Prior Art] Conventionally, in a contact printing apparatus for photosensitive materials, a transparent plate made of glass ash or the like is used. Place a pin for position 1tj at z, and set this position i
The original plate and the photosensitive material can be positioned and mounted by engaging the Ir fixing pins with the holes of the original plate and the II3 optical material, or the original plate can be mounted in advance at a predetermined position on the translucent plate. Then, the photosensitive material is positioned and attached to the original plate using positioning pins, and then a flexible sheet such as a rubber sheet is rolled out and stretched over the photosensitive material using a roller or the like, and a transparent plate and a flexible sheet are placed on the photosensitive material. Flexible sea j・between 4J1:
The original plate and the light-sensitive material are brought into close contact with each other by careful attention, and then a light source disposed below the translucent plate is turned on to perform printing. - [- In the above-mentioned photosensitive material density/n printing device, if a recycled plate is used as the photosensitive material instead of a new printing plate such as a commercially available P3 plate, etc., the following will apply. There is a problem. A recycled plate was created by removing the photosensitive agent on the plate surface of a used printing plate used for proof + E printing etc. by polishing it, and applying new photosensitive agent on the polished surface using a coating device such as Whaler. Although it is a printing plate, the surface of this recycled plate is polished each time it is recycled, so it has a general photosensitivity of +1
It often has a curved hem. In addition, the height of the positioning pin for photosensitive material is limited due to the need to develop an 0I flexible sheet on its side.
It has a height of only about 1. Therefore, when using a recycled plate as a photosensitive material, even if the photosensitive material's bottle hole is once engaged with the positioning pin and its position is determined, the bottle hole will come off from the pin at position tk due to warping of the photosensitive material. Sometimes. If the flexible sheet 1- is expanded and stretched in this state, the photosensitive material will be pushed onto the flexible sheet 1, and the portion of the photosensitive material that does not have the bottle hole on the positioning pin will at least partially To! Not only will the position of the photosensitive material be shifted, but the iT
] When venting between the flexible seams 1~ and the translucent plate, the positioning pins may damage the bottle holes in the photosensitive material, dent the photosensitive material, or in extreme cases create holes other than the pin holes. Sometimes I put it away. These two problems occur not only when a recycled plate is used as a photosensitive material, but also when a curled photosensitive material is used. In order to solve this problem, until the flexible seam I- suppresses the end of the photosensitive member 4421 opposite to the bottle hole, the area around the pin hole is suppressed by a presser bar. A device that prevents the material's bottle hole from coming off from the positioning pin is disclosed in, for example, JP-A-57-2:
) No. 942. [Problems to be Solved by the Invention] According to the device disclosed in this Japanese Patent Application Laid-Open No. 57-23942, the positioning pin of the photosensitive material is placed at the end on the side where +if flexible part 1 starts tensioning. It is necessary to place it at the end opposite to the part. However, in general, photosensitive tt materials such as printing plates are not rigid bodies, but are made of flexible materials such as aluminum plates.
If the flexible sheet is not placed at the end on the side where tensioning starts, 'ii7 While the flexible sheet is being rolled out using rollers, etc., the photosensitive material is pushed toward the positioning pin side by the flexible sheet during tensioning. This causes a slight deflection, causing the photosensitive material to move toward the positioning pins with respect to the original plate, resulting in a problem in that positioning accuracy deteriorates. [Means for Solving the Problems] As a means for solving the problems described in -1, the present invention provides a method in which an original plate is mounted on a translucent plate i-, and then a photosensitive +4 material is applied to the original plate -■-. Position and install using positioning pins

[1.
A flexible sheet 1- is stretched over the photosensitive material 1-, and the space between the translucent plate and the flexible sheet is evacuated. In a contact printing method for a photosensitive material in which the original plate is brought into close contact with the photosensitive material and then printed, at least IJ:l
- a contact printing method for a photosensitive material in which air is blown onto the photosensitive material at least near the positioning pins from when the photosensitive material is attached to the photosensitive material until the flexible sheet starts to be stretched on the photosensitive material; A translucent plate to which the original plate is attached. A light source disposed below the translucent plate; a positioning pin disposed on the translucent plate; a means for stretching a flexible sheet on the translucent plate; an exhaust means for evacuating the space between the flexible sheet and the flexible sheet; a means for transporting the photosensitive material for attaching the photosensitive material to the translucent material in such a manner that the pin holes of the photosensitive material engage with positioning pins; The present invention provides a contact printing apparatus for photosensitive materials having a spraying means. [Operation] After the photosensitive material is positioned using the positioning pins and mounted on the original plate, air is blown onto the photosensitive material near the positioning pin 5 to press the photosensitive material against the translucent plate using air pressure, and the pins of the photosensitive material are Prevents the hole from coming off the positioning pin. In addition, since the photosensitive material near the positioning pin is pressed by air pressure, even when the positioning pin is placed at the end of the side where ・liT deflection↑1 sea 1- starts tensioning, the tensioning of the flexible sheet It does not interfere with the first death. If air is blown onto the positioning pin from the front of the rubber sheath 1-roller, the photosensitive material can be pressed until just before the flexible sheath 1- is stretched over the positioning pin. [Embodiments] Hereinafter, embodiments of the present invention will be described based on the attached drawings. FIG. 1 is a side view of the contact printing apparatus for photosensitive materials with the side plate removed. FIG. 2 is a front view including a partial cross section. In these figures, (IOA) is an original plate recovery barrel 1-2 for storing used original plates (1 (IB) is an original plate recovery barrel 1-2 in which original plates are stacked and stored in the order of use. (IO
C), (IOD), and (IOE) each have a valet for $11 of photosensitive material that is divided by size and stored separately, and each pallet (IOA), (IOB), (IOc),
(IOD) and (1, 0E) are not shown between the standby position of the ball knot shown in FIG. It is configured to be movable by driving an air cylinder. In addition, each ballen 1 to (10B), (IOC), (IOD>, (IO
Inside E), pallet positioning pins with a height comparable to the depth of the pallet are set up, and each pallet (10B), (IOC), (IOD), (IOE)
The original plate and the photosensitive material housed in are positioned and placed using positioning pins for the barrels 1 to 1. Further, (14) in the figure is a carrier for conveying the original plate and photosensitive material, and this carrier (14) is supported by a rail (16) and a linear bearing (18), and is driven by an air cylinder (not shown). A trolley (20
), the pallet can be moved in the left-right direction on the plane of FIG. The carrier (14) is configured to be movable vertically on the plane of FIGS. 1 and 2 by driving an air cylinder (22) provided on the truck (20). The carrier (14) has a first suction part (24) which will be described later.
and a second suction part (26), and each suction part (24), (26) has a suction cup (28) connected to an empty pump and a near compressor at 1° (not shown) below.
have. This second suction part (26) is connected to the motor (3).
The structure is such that it can be moved by one loaf to accommodate the size of the original plate and photosensitive material by the drive of the screw (32) rotated by the screw (32). (34) in Figure 1 is surrounded by Goj1 Sea + (36)
(38) is a squeegee roller that squeezes the rubber sheath h (36) with white i1. Both sides (34) and (38) of this item 1) are pivotally supported at both ends by a support plate (42) that moves along a guide rail (40), and the support plate (42)
can be moved to the right from the position shown in FIG. 1 by driving a chain (4G) connected to a motor (44) via a sprocket 1-, etc. Also, as the support plate (42) moves, the roller and sheet roller (34)
The rubber sheet (36) is spread out and stretched over one unit of the glass plate (12), and the squeegee roller (38) is configured to squeegee the stretched rubber sheet (36). In addition, (48) in the same figure is an exhaust part arranged on the glass plate (12), and as shown in the top view in Fig. 3 and the side sectional view in Fig. 4, there is a It has a ventilation hole (50) and a groove (52) at the top, and a gasket (50).
4), it is disposed in an airtight state with the glass plate (12). This exhaust section (48) is connected to a vacuum pump (not shown), and the exhaust section (48) evacuates between the rubber sheet (36) and the glass plate (12), thereby bringing the original plate and the photosensitive material into close contact. Let me. At this time, it is preferable to arrange a packing or the like around the glass plate (12) to improve airtightness. In addition, (92) in the same figure is a positioning pin fixed to a required part on the glass plate (12) with double-sided tape or the like. Further, (56) is a light source for printing disposed below the glass plate (12), and (58) is a reflecting mirror disposed around it. Further, (60) is a frame body (64) having a suction cup (62).
) is fixed in a cantilevered manner to a rotating arm (66).
), and the photosensitive material falling from the carrier (14) with the photosensitive layer downward at the standby position of the pallet is discharged onto the photosensitive material discharge belt conveyor (74) with the photosensitive layer upward. FIG. 5 is a perspective view showing the first suction part (2=1) disposed at a position corresponding to the positioning pin (92), and FIGS. 6 to 10 show the photosensitive material on the glass plate (12). FIG. 7 is an enlarged view showing the operation of the suction part (24) in FIG. There is. In these figures, (88) is an original plate, and (90) is a photosensitive material. Further, (76) is a support member fixed to the support rod (78), and has the above-mentioned suction cup (28) at its lower part. (80) is a bell-shaped holding member, and is an L-shaped metal fitting (80) fixed to the support member (76).
2) of the air cylinder (84) supported by the rond (
96), and can be moved northward between the position indicated by the solid line and the position indicated by the broken line shown in FIG. 5 by driving the air cylinder (84). (86) is a nozzle for blowing air onto the photosensitive material near the positioning pin (92), and the nozzle (86) is connected to the tube (94) provided at the end of the support rod (78) and the support rod (78). They communicate through internal ventilation holes, and the pipe (94) is connected to a near compressor (not shown). Next, the printing operation in the above-mentioned contact printing apparatus will be explained. First, the original plate ball I-(IOB) is moved from the standby position shown in FIG. 1 to the drawer position directly above the glass plate (2). Next, lower the carrier (14) and
) holds the original plate (88) by suction, and then the carrier (1
4) and raise the original board ball 1-(IOB).
Return to standby position. Next, the carrier (14) is lowered to the position (B) shown by the two-dot chain line in Fig. 2 (at this time, the first suction part (24) is lowered to the position shown in Figs. 6 and 7 ), and the positioning pin (92) is stopped at the position where it is inserted into the bottle hole of the original plate (88). In this state, the suction cup (28) blows out a small amount of air, releases the adsorption of the original plate (88), and causes the original plate (88) to fall under its own weight, and as shown in FIGS. 8 and 9, the suction cup (28) (80) is lowered to completely engage the pin hole of the original plate (88) with the positioning pin (92). Original plate (88
) is mounted on the glass plate (12), first the presser member (80) rises to the position shown in FIGS. 6 and 7,
Subsequently, the carrier (14) is raised to the position shown in FIG. Next, the photosensitive material palette (IOC), (100), (
One pallet (tOC) of the IOE) is moved from the standby position to the pull-out position, and the original plate (88) is moved from the standby position to the pull-out position.
As in the case of , the photosensitive material (90) is transferred to the carrier (14).
suction cup (28) to return the ballen 1- (10C) to the standby position. Next, carrier (14) is the second
Lower it to the position (B) shown by the two-dot chain line in the figure,
As shown in Figures 6 and 7, use the positioning pin (92
) is slightly inserted into the bottle hole of the photosensitive material (90) and then stopped. In this state, a small amount of air is blown out from the suction cup (28) to release the adsorption of the photosensitive material (90) and allow the photosensitive material (90) to fall under its own weight, as shown in FIGS. 8 and 9. The holding member (80) is lowered to completely engage the pin hole of the photosensitive material (90) with the positioning pin (92). Next, high-pressure air is blown from the nozzle (86) toward the photosensitive material (90) near the positioning pin (92), and the holding member (80) is raised to the position 1d shown in FIGS. 6 and 7. let At this time. Even if the photosensitive material (90) has warpage, the photosensitive material (90)
) will not come off the positioning pin (92). When the photosensitive material (90) is attached to the original plate (88) i,
The carrier (14) is raised to the position (A) shown by the two-dot chain line in FIG.
) rises to the position shown in Figure 1θ) and stops. During this time, the air blowing from the nozzle (86) continued, and then the rubber sheet roller (34) and the squeegee roller (38) were moved from the position shown in FIG. 1 in the direction of the arrow in FIG. The rubber sheet (3G) is spread and stretched over the photosensitive material (90), and the discharge tube 1 is
Glass plate (12) and rubber sheet (36) from part (48)
) 1m of air is exhausted and the original plate (88) and photosensitive material (90
) and bring them into close contact. When the tensioning of the rubber seal 1-(36) is completed, the blowing of air from the nozzle (86) is stopped, and the carrier (14) is raised by 1" to the position shown in FIG. Subsequently, the light source (56) is turned on for a required period of time to perform printing. When the baking is completed, return the rubber seal roller (34) and squeegee roller (38) to the position shown in Figure 1, and then move the carrier (14) onto the photosensitive material (90) on which the suction cup (28) has been baked. ), and after adsorbing and holding the photosensitive material (90), it is raised -J1. Next, the carrier (14) is moved to a position facing the reversing transport mechanism (60), and the photosensitive material (90) is moved to a position facing the reversing transport mechanism (60).
60)'s suction cup (28) l. The discharged photosensitive material (90) is reversed and discharged onto a discharge belt conveyor (74) by a reversing conveyance mechanism (60), and is conveyed to a photosensitive material processing apparatus (not shown) or the like. While the photosensitive material (90) is being discharged, the carrier (1
4) holds the original plate (88) by suction, and discharges the original plate (88) to the original plate collection pallet (IOA) that has been moved to the pull-out position. Thereafter, when the carrier (I4) rises to the position shown in FIG. 1 and the original plate collection pallet (10A) returns to the standby position, one cycle of photosensitive material contact printing is completed. In the above-described embodiments, a case has been described in which the printing of the photosensitive material is carried out fully automatically, but the present invention is not limited thereto. Furthermore, in the above-described embodiment, air is blown from the nozzle (86) only when attaching the photosensitive material (90) to the positioning pin (92).
You can also blow air when installing the device. In addition, the original plate (
88) may be positioned on the glass plate (12) by positioning means other than the positioning pin (92). In addition, in the embodiment described above, the presser member (8
0), the photosensitive material (90) is completely attached to the positioning pin (92), but when the suction cup (28) releases the suction holding of the photosensitive material (90), the nozzle (
86) By making it more air 'A & spraying configuration,
It is also possible to omit the holding member (80). Furthermore, instead of blowing air from the nozzle (86), air may be sprayed from a suction cup (28) or a holding member (80), or the nozzle (86) may be fixed to a part unrelated to the carrier (14). Good too. Furthermore, air may be blown not only onto the photosensitive material (90) near the first positioning pin (92) but also onto other parts of the photosensitive material (90). [Effects] In the contact printing method and device for photosensitive materials according to the present invention, since the photosensitive material near the positioning pin is pressed by blowing air, for example, the photosensitive material can be Even when the flexible sheet is stretched from the end on the positioning pin side, the tension of the flexible sheet is not affected and the pin hole of the photosensitive material can be prevented from coming off from the positioning pin. , it is possible to improve the printing position accuracy of the photosensitive material. In addition, when air is blown onto the positioning pin from the front of the rubber sheet roller, it is possible to press the photosensitive material until just before the flexible sheet 1- is stretched on the photosensitive material near the positioning pin. can.

[Brief explanation of drawings]

The drawings all show embodiments of the present invention, and FIG. 1 is a side view of the photosensitive material contact printing apparatus with the side plate removed, FIG. 2 is a front view including a partial cross section, and FIG. The figure is a top view of the exhaust part (48), Figure 4 is a side sectional view thereof, Figure 5 is a perspective view showing the first suction part (24), and Figures 6 to 1O are the first suction part. (24) is an enlarged view showing the operation. 12...Glass plate (translucent plate). 14...Carrier, 28...Sucker, 34...
・Rubber seam 1-roller, 36... Go 12 sheet (flexible seam 1-), 48...
Exhaust part, 56... Light source, 86/ Nozzle 2
88...Original plate, 90...Photosensitive material, 92...Positioning pin. Agent Buwo RifS Ma Miyatake tll: ・Figure 2

Claims (1)

[Claims] 1. An original plate is mounted on a translucent plate, a photosensitive material is positioned and mounted on the original plate using positioning pins, a flexible sheet is stretched over the photosensitive material, and the translucent In a contact printing method for photosensitive materials, in which the original plate and the photosensitive material are printed in close contact with each other by evacuating the space between the plate and the flexible sheet, after the photosensitive material is superimposed on the original plate, at least A method for contact printing a photosensitive material, characterized in that air is blown onto the photosensitive material until the flexible sheet starts to be stretched. 2. A translucent plate to which the original plate is attached, a light source placed below the translucent plate, a positioning pin placed upright on the translucent plate, and a flexible sheet placed on the translucent plate. means for stretching, an exhaust means for evacuating space between the translucent plate and the flexible sheet, and mounting the photosensitive material on the translucent plate in such a manner that the pin holes of the photosensitive material engage with the positioning pins. A contact printing apparatus for a photosensitive material, comprising a means for transporting the photosensitive material and a means for blowing air onto the photosensitive material. 3. A contact printing apparatus for photosensitive material according to claim 2, wherein means for blowing air onto the photosensitive material is arranged near the positioning pin. 4. A contact printing apparatus for a photosensitive material according to claim 2, wherein means for blowing air onto the photosensitive material is attached to the means for transporting the photosensitive material. 5. Any one of claims 2 to 4, wherein the means for blowing air onto the photosensitive material is arranged so as to blow air onto the positioning pins from a direction opposite to the direction in which the flexible sheet is stretched. A contact printing apparatus for the photosensitive material described above.