JPH0387834A - Device for processing photosensitive material - Google Patents

Abstract

PURPOSE:To prevent the bending of the rear end part of a photosensitive material by rubbing brush by disposing a means for preventing the bending near the rubbing brush. CONSTITUTION:The photosensitive material 12 is automatically transported in a processing liquid and while the material is rubbed with the brush, the material is processed. A kick preventive plate 80 is disposed near the rubbing brush 64. One end of the preventive plate 80 is disposed on the downstream in the transporting direction of the photosensitive material 12 to support the rear end of the photosensitive material 12 past the brush 64. The bending of the photosensitive material 12 by the kick of the rubbing brush 64 is, therefore, obviated. The kick preventive plate 80 may be a bar or a bar body attached with a mesh.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a photosensitive material processing apparatus in which a photosensitive material on which an image has been printed is automatically conveyed and immersed in a processing liquid and processed while being rubbed with a rubbing brush.

[Prior Art] A photosensitive material, such as a photosensitive lithographic printing plate, on which an image has been printed is sent to a photosensitive lithographic printing plate processor, which is a photosensitive material processing device, and is transferred to a developing tank equipped with the photosensitive lithographic printing plate. After being developed and washed with water in a rinsing tank or washing tank, a finisher liquid is applied.

A developer is supplied into the developer tank, and the photosensitive planographic printing plate is conveyed and immersed into the developer tank to be subjected to development processing. While being transported and immersed in the developer, the surface of the photosensitive planographic printing plate other than the exposed areas is scraped off by a rubbing brush placed in the developer. This leaves an image area or a non-image area which is an exposed area.

In general, in photosensitive materials that are developed by curing the light-irradiated areas upon image exposure, unnecessary areas other than the image areas are rubbed off by a rubbing member such as a brush.

[Problems to be Solved by the Invention] However, in the conventional photosensitive material processing apparatus described above, immediately after passing through the brush, the photosensitive material is pressed upward by the rotation of the brush, and the rear end of the photosensitive material is bent due to so-called vignetting. There was a problem.

In order to solve this problem, it has been considered to arrange an vignetting prevention bar at a position immediately after the brush passes the photosensitive material.

However, since the space between the brush and the photosensitive material immediately after passing through the brush is very narrow, the vignetting prevention bar cannot be placed close to the brush.

For this reason, this anti-sharp bar could not completely prevent the rear end from bending.

The present invention has been made in consideration of the above facts, and an object of the present invention is to provide a photosensitive material processing apparatus that can prevent the rear end of the photosensitive material from being bent by the brush.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, one end is disposed near the rubbing brush, and the other end is disposed downstream in the conveying direction of the photosensitive material, and passes through the brush. The present invention is characterized in that a bending prevention means is provided to support the rear end of the photosensitive material and prevent the rear end of the photosensitive material from being bent by the brush.

[Operation] The image-exposed photosensitive material is automatically conveyed and immersed in the processing liquid, and is processed while being rubbed with a brush. The rear end of the photosensitive material that has passed through the brush is supported by the bending prevention means. This prevents the photosensitive material from being bent by the brush at the rear end.

In this case, the rotation of the brush causes the rear end of the photosensitive material to
It is urged in the direction away from the regular conveyance path of the photosensitive material,
It will deform slightly, but since the photosensitive material has some elasticity,
Bending is prevented without causing plastic deformation.

[Effects of the Invention] In the present invention having the above configuration, one end side of the bending prevention means is disposed near the brush, so that the rear end of the photosensitive material immediately after passing through the brush is supported, and the rear end of the photosensitive material is An excellent effect can be obtained in that bending of the material can be prevented.

[Embodiment] FIG. 1 shows an embodiment of a photosensitive lithographic printing plate processor 1 (l) which is an example of a photosensitive material processing apparatus according to the present invention.

The photosensitive planographic printing plate processor 10 includes a first developer tank 14 for developing a photosensitive planographic printing plate (hereinafter referred to as "23rd plate") 12 on which an image has been printed by a printing device (not shown), and a 23rd plate 1.
a second developer tank 16 that performs auxiliary development processing on the PS plate 12; an overflow tank 18 disposed between the first developer tank 14 and the second developer tank 16; and a finisher tank 20 that applies finisher liquid to the PS plate 12. are provided.

1st developer tank> As shown in FIG.
A pair of conveyance rollers 22 is arranged on the insertion side of the paper. The 23rd plate 12, on which an image has been printed by a printing device (not shown), is inserted between the pair of transport rollers 22, and the inserted 23rd plate 12 is sent into the photosensitive planographic printing plate processing machine IO.

The first developer tank 14 has an approximately inverted mountain shape with an open top and a bottom central portion protruding downward.

A developer 24 is contained within the first developer tank 14 . Inside the first developing tank 14, guide rollers 26, 28, 30, 32, 34, 36, 38 having the same diameter are arranged along the bottom wall. These guide rollers 26 to 38 are skewer-shaped rollers in which a plurality of elastic rotating members are supported on the outer periphery of the shaft, and the shaft is supported by being stretched between a pair of side plates (not shown). .

Further, a guide roller 40 having a larger diameter than the guide roller 26 is arranged above the guide roller 26, a guide roller 42 is arranged above the guide roller 36, and a guide roller 40 is arranged above the guide roller 36.
A guide roller 44 is arranged above the roller 8 . These guide rollers 40, 42, 44 are the guide rollers 26
- 38, it is supported by a pair of side plates (not shown).

A pair of transport rollers 46 is arranged between the guide rollers 30 and 32 in the center of the first developer tank 14 . This conveyance roller pair 46 is supported by a pair of side plates (not shown), and is rotated by the driving force of a driving means (not shown) transmitted thereto.

A guide roller 48 having a larger diameter than the guide roller 30 is arranged between the conveyance roller 46 and the guide roller 30.

This guide roller 48 is a skewer-shaped roller and the guide roller 2
Similar to 4-38, it is supported by a pair of side plates. A guide 52 is attached to the shaft of the guide roller 48 via a bracket 50. One end of this guide 52 is fixed to the bracket 50, and the other end is arranged toward the pair of conveying rollers 46. As a result, the 23rd plate 12 is guided between the conveyance rollers 46.

Therefore, the 23rd printing plate 12 sent into the first developer tank 14 by the conveying roller pair 22 is inserted between the guide roller 24 and the guide roller 40, and the guide roller 28, 30, 48
The paper is guided by the guide 52 and is inserted between the pair of transport rollers 46 by the guide 52 . After passing through the pair of transport rollers 46, it is guided by guide rollers 32, 34, 36, 42, 38 and rises obliquely, and is guided by guide rollers 44 and sent onto the overflow tank 18. As a result, the 23rd plate 12 is immersed in the developer in the first developer tank 16 and developed.

The guide roller 32 is formed by a plurality of elastic rotating members pivotally supported on the outer periphery of a spray pipe 54 in which a plurality of discharge ports are formed along the axial direction.

This spray pipe 54 is communicated with one end of a conduit 56. The other end of the conduit 56 passes through the bottom of the second developer 16 and opens into the second developer tank 16 .

A supply pump 58 (7,) is disposed in the middle of the pipe line 56, and this supplies the developer 24 in the second developer tank 16 to the spray pipe 54.

Further, a spray pipe 60 is arranged above the guide roller 32. The spray pipe 60 is provided with a plurality of discharge ports opening toward the conveying roller pair 46 along the axial direction. This spray pipe 60 is also in communication with the pipeline 56, and the developer 24 in the second developer tank 16 is
is supplied by supply pump 58.

A brush 62 is arranged between the spray pipe 60 and the guide roller 42. This brush 62 has a rotating shaft 64 rotatably supported by a side plate (not shown), and is rotated by the driving force of a driving means (not shown) transmitted thereto.

The brush 62 is a long fibrous brush that is spirally wound around a rotating shaft 64 through a nylon sheet and bonded to the rotating shaft 64.

This fibrous brush is made of nylon, ETEF, PPS, PP, etc. Also, the outer diameter is 40mmΦ or less and 25~
40mmΦ is preferable, and the wire diameter of the fibrous brush 66 is 20~
It is set to 70μ. In addition, the rotation speed of this fibrous brush is set at 300 rpm or less, and 60~2,
OOr pm is preferred.

Alternatively, the brush 62 may be formed by providing a spiral groove on the rotating shaft, inserting a torsion brush into the groove, and winding the brush. In this case, the Nejiri Brush is a brush with bristles fixed to two wire rods, and when the wire of this Nejiri Brush is inserted into the groove, the bristles are evenly scattered outside the groove and protrude, and the radially erected bristles are attached to the rotating shaft. evenly distributed around it. This torsion brush is molded from the same material as the fibrous brush described above.

23 plate 1 between guide roller 36 and guide roller 38
A brush 78 having the same configuration as the brush 62 is provided at the bottom of the conveyance path No. 2.
is located.

A scraping prevention plate 80 is provided on the guide roller 42 side of the brush 62.
is located. As shown in FIG. 2, a plurality of rectangular notches 180 are formed on the downstream side in the direction in which the photosensitive material is transported. The guide roller 42 is inserted into this notch 180. A support portion 182 for the support shaft of the guide roller is formed at the end on the notch 180 side, and is supported to this rotation shaft by a bolt or the like (not shown).

The middle part of the vignetting prevention plate 80 is bent, and the brush 6
As shown in FIG. 1, a flat portion 184 is formed on the fourth side to be inclined with respect to the conveyance path of the photosensitive material. As shown in FIG. 3, the height 11 of the plane part from the conveyance path of the photosensitive material is set to 51XII11 or less, and the length 12 of the plane part is 5 to 50flIffl, preferably 20 to 50mm.
is set to . Further, the inclination angle θ with respect to the conveyance path is set to be greater than or equal to 110 degrees and less than or equal to +10 degrees.

Further, the distance I23 between the brush 64 and the tip 186 of the flat portion 184 is set to +1 to -5 mm, preferably 0 to -1 mm. Here, Q mm is the distance from the tip 18 to the brush 64.
6 is in contact with each other.

This vignetting prevention plate 80 prevents the 23rd plate even if the rear end of the 23rd plate 12 passing between the brush 62 and the guide roller 36 is pressed upward as the brush 64 rotates counterclockwise in FIG. The rear end of the plate 12 is supported to prevent the plate 23 from bending.

Furthermore, a scratch prevention plate 82 is arranged between the brush 78 and the guide roller 38. The vignetting prevention plate 82 has the same structure as the vignetting prevention plate 80, and supports the rear end of the 23rd plate 12 to prevent it from being bent downward.

A pipe line 84 that communicates with the bottom of the overflow tank 18 opens above the first developer tank 14 . A pump 86 (P,) is disposed in the middle of this conduit 84. Also the first
Above the developer tank 14 is a pipe line 9 communicating with a water supply tank 88.
0 is open, and a water supply pump 92 (P2) is disposed in the middle of this pipe line 90. This water supply pump 92
is connected to a conductivity replenishment controller 176, which will be described later. As a result, the timing of water supply to the first developer tank 14 is controlled.

Further, one end of a conduit 94 is connected to the lower part of the first developing tank 14 . A conductivity detector 96 (
S), a circulation pump 98, and a filter 100 (F) are arranged, and the other end is communicated again to the lower part of the first developer tank 14. Therefore, by the operation of the circulation pump 98, the developer 24 stored in the lower part of the first developer tank 14 passes through the pipe 94, passes through the conductivity detector 96 and the filter 100, and then returns to the first developer tank 14. sent inward. As a result, the conductivity of the developer 24 is detected, dust in the developer is removed, and the developer 24 in the first developer tank 14 is stirred.

Further, the conductivity detector 96 is connected to the conductivity replenishment controller 17.
6 detects the conductivity of the developer 24 passing through the pipe 94, detects the conductivity of the developer 24 in the first developer tank 14, and transmits this detection result to the conductivity charge controller 17.
6 Communicate.

Further, a liquid level lid 102 is arranged above the first developing tank 14 . The movement of the liquid level lid 102 in the transport direction of the 23rd plate 12 is regulated by a stopper (not shown), but the movement in the liquid level height direction is not regulated. Therefore, the amount of developer 24 in the first developer tank 14 decreases, and the amount of developer 24 in the first developer tank 14 decreases.
When the liquid level decreases, the liquid level lid 102 moves down to follow this decrease.

This liquid level lid 102 prevents deterioration of the developer caused by the developer absorbing carbon dioxide gas in the air and neutralizing the alkali'Jt content in the developer. It also prevents the developer from evaporating.

Further, a guide cover 104 for beam entry is arranged above the first developing tank 14. This guide cover 104
After the development process, the PS plate 12 is directly guided and inserted into the second developer tank 16 by jumping over the first developer tank 14 for performing development processing and finisher processing.

Overflow tank> The upper part of the side wall of the first developer tank 14 on the overflow tank 18 side is bent toward the overflow tank 18 side, and the developer 24 in the first developer tank 14 overflows the upper part of this side and overflows. It is collected into the tank 18.

A pair of conveying rollers 106 is arranged at the upper part of the side wall that partitions the overflow tank 18 and the second developer tank 16. These transport roller pairs 106 are rotatably supported by a side plate (not shown), and are rotated by the driving force of a driving means (not shown) transmitted thereto. The 23rd printing plate 12 sent out from between the guide rollers 38 and 44 is inserted between the pair of transport rollers 106.

The conveyance roller 106 located on the upper side has a small diameter roller 10.
8 are placed in contact with each other. This roller 108 is connected to the developer 24 in the second developer tank 16 adhering to the conveyance roller 106.
is prevented from entering the overflow tank 18.

Further, the transport roller 106 located further below has an overflow tank 18 and a roller 110.1 inside the second developer tank 16.
12 are arranged in contact with each other. The roller 110 is carried out by the 23rd printing plate 12 in the first developer tank 14 to prevent the developer 24 adhering to the transport roller 106 from entering the second developer tank 16 . Further, the roller 112 prevents the developer in the second developer tank from entering the overflow tank 18.

Inside the overflow tank 18 is a conduit 114 that penetrates the bottom.
One end of the pipe 114 extends from the bottom to a predetermined height, and the height of the developer in the overflow tank 18 is determined by the height of the pipe 114 from the bottom. The other end of this conduit 114 opens into a drain tank 116 .

Second developer tank> At the upper part of the second developer tank 16, a pair of transport rollers 118 are arranged on the side of the printer tank 20. These transport roller pairs 118 are rotatably supported by a side plate (not shown). The driving force of the driving means is transmitted and rotates. A pair of conveyor rollers 10 is disposed between these pairs of conveyor rollers 118.
The 23rd edition 12 sent out from between 6 and 6 is inserted. As a result, the 23rd plate 12 is conveyed substantially horizontally above the second developing tank 16.

23 plate 12 between conveyance roller 106 and conveyance roller 118
A spray pipe 120 having the same structure as the spray pipe 54 described above is arranged above the conveyance path. The outlet of the developer 24 of this spray pipe 120 is connected to the conveyor roller 1.
It is opened toward the 06 side, and discharges the supplied developer between the conveyance roller 106 and the upper surface side of the 23rd plate 12. This spray pipe 120 is connected to one end of a conduit 122. The other end of the conduit 122 communicates with the bottom of the second developer tank 16, and a supply pump 124 is disposed in the middle. A developer 24 is stored in the lower part of the second developer tank 16, and the developer 24 is stored in the lower part of the second developer tank 16.
4 is supplied to the spray pipe 120. As a result, the developer 24 is discharged and applied onto the surface of the 23rd plate 12.

A kite roller 126 is disposed at the bottom of the conveyance path for the 23rd plate 12 in correspondence with the spray pipe 120. Like the guide roller 32, this guide roller 126 is a spray pipe 12 having a plurality of discharge ports formed along the axial direction.
A plurality of elastic rotating members are pivotally supported on the outer periphery of 8. This spray pipe 128 is in communication with the conduit 122, and the developer 24 is supplied by the operation of the supply pump 124.

A plurality of discharge ports are opened in the spray pipe 128 along the axial direction between the conveyance roller 118 and the back side of the 23rd printing plate 12. The developer 24 thus supplied is discharged and applied to the back side of the 23rd plate 12.

One end of a conduit 130 is communicated with the bottom of the second developing tank (6). The other end of the pipe line 130 is connected to a developing solution tank 132. A stock solution supply pump 1 is located in the middle of the pipe line 130.
32 (P,) are arranged. This stock solution supply pump 1
32 is connected to a processing replenishment controller 164, which will be described later, and its operation is controlled.

Further, one end of a conduit 134 is communicated with the bottom of the second developing tank 16 . The other end of the pipe line 134 is connected to a water supply tank 88. A water supply pump 136 is arranged in the middle of the pipe line 134. This water supply pump 136 (P3) is connected to the conductivity replenishment controller 176 and the processing replenishment controller 164, and their operations are controlled.

Further, one end of a conduit 138 passes through the bottom of the second developer tank 16 and projects into the second developer tank. This second developing tank 16
The height of the inward protrusion sets the liquid level height of the developer 24 in the second developer tank 16 . The other end of the pipe line 138 is a drain tank 140
The developing solution 14 that has overflowed the pipe line 138 is discharged.

Finisher tank> A partition plate 142 is provided on the side wall that partitions the second developer tank 16 and the finisher tank 20.
The developing solution 24-4 attached to the pair of transport rollers 118 is prevented from being mixed into the finisher solution in the finisher tank 20.

A pair of conveyor rollers 144 is arranged on the exit side in the upper part of the finisher tank 20.
is rotatably supported by a side plate (not shown), and is rotated by the driving force of a driving means (not shown) transmitted thereto. The conveyance roller pair 144 is arranged at a slightly lower position than the conveyance roller 118. A pair of conveying rollers 11 is provided between the pair of conveying rollers 144.
The 23rd edition 12 sent out from between 8 and 8 is inserted. As a result, the 23rd plate 12 is transported with the upper part of the second developing tank 16 tilted.

23 plate 1 between the conveying roller pair 118 and the conveying roller 144
A spray pipe 146 having the same configuration as the spray pipe 54 described above is arranged above the conveyance path No. 2. A discharge port for the developer 24 of the spray pipe 146 is opened toward the conveyance roller 144 side, and the supplied developer is discharged between the conveyance roller 144 and the upper surface side of the 23rd plate 12. This spray pipe 146 is connected to one end of a conduit 148. The other end of the pipe line 148 is the finisher tank 2
0, and there is a supply pump 150 on the way.
is located. A finisher liquid 152 is stored in the lower part of the finisher tank 20, and the finisher liquid 152 is stored at the bottom of the finisher tank 20.
50 causes this finisher liquid 152 to be supplied to the spray pipe 146. As a result, the finisher liquid 152 is discharged and applied onto the surface of the 23rd plate 12.

A finisher liquid coating box 154 is arranged at the bottom of the conveyance path for the 23rd plate 12 in correspondence with the spray pipe 146 . The finisher liquid application box 154 has a substantially U-shaped cross section, and an opening 154A is formed toward the top. A spray pipe 156 is arranged within the finisher liquid application box 154. Similar to the spray pipe 146, this spray pipe 156 has a plurality of discharge ports formed along the axial direction toward the corners of the finisher liquid application box 154. This spray pipe 154 is in communication with a conduit 148, and when the supply pump 148 is operated, the finisher is sprayed.
Liquid 152 is supplied into finisher liquid application box 154 . The finisher liquid 152 supplied into the finisher liquid application box 154 overflows from the opening 154A and is applied to the back side of the 23rd plate 12 passing above.

One end of a conduit 158 is connected to the bottom of the finisher tank 20 . The other end of the pipe line 158 is connected to a finisher liquid tank 160. A stock solution supply pump 162 (P,) is arranged in the middle of the pipe line 158. This stock solution supply pump 162 is connected to a processing replenishment controller 164 to control its operation.

Further, one end of a conduit 166 is communicated with the bottom of the finisher tank 20. The other end of the pipe 166 is a water tank 88
is connected to. A water supply pump 1 is installed in the middle of the pipe 166.
68 (P3) is arranged. This water supply pump 136
is connected to the conductivity replenishment controller 176 and the process replenishment controller 164, and their operations are controlled.

Further, one end of a conduit 1170 passes through the bottom of the finisher tank 20 and projects into the finisher tank 20. The height of this protrusion into the finisher tank 20 sets the liquid level height of the finisher liquid in the finisher tank 20. The other end of the pipe line 170 opens to a drain tank 172, and the developer that has overflowed the pipe line 170 is discharged.

A detector 174 connected to the processing replenishment controller 164 is arranged on the insertion side of the transport roller pair 22. The detector 174 detects the passage time of the 23rd plate 12 at the insertion port of the photosensitive planographic printing plate processing machine IO, and detects the preset PS.
Using the processing speed of the plate and the width dimension of the PS plate, the processing replenishment controller 164 calculates the area of the 23 plate 12 to be inserted into the photosensitive planographic printing plate processor 10.

Next, the operation of this embodiment will be explained.

The 23rd plate 12 on which an image has been printed by a printing device (not shown) is inserted into a pair of transport rollers 22, and later inserted between the guide roller 40 and the guide roller 26 of the first developer tank 14, and then inserted into the first developer tank 14. sent to. The 23rd plate 12 is guided by guide rollers 28, 30, 48 and lowered to the center of the first development area.

The large-diameter idler roller 52 guides the tip of the 23rd plate 12 without deviating from the predetermined conveyance path, and the guide 52
It functions to insert the leading end of the third plate 12 between the pair of conveying rollers 46.

The 23rd plate 12 inserted into the pair of conveying rollers 46 and sent out from the pair of conveying rollers 46 is moved by the guide rollers 32, 34, .
36, 42, 38, and 44, rises, and is sent out from the first developer tank 14.

During this conveyance, both sides of the PS plate 12 are rubbed by brushes 62, 78, and unnecessary swollen or dissolved photosensitive layers are rubbed off. This ensures that the 23rd plate 12 is developed.

Since this brush 62.78 is formed with a small diameter, the rotating shaft 64.70 is placed in the developer, and the liquid level lid 102 reduces the contact of the developer 24 with air, resulting in deterioration of the developer 24. In addition, it is possible to reduce the size of the first developing tank 14, thereby reducing costs.

In addition, the rear end of the 23rd plate 12 that has passed the brush 62.78 is supported by the vignetting prevention plate 80.82 immediately after passing the brush 62.78, so the rear end of the 23rd plate 12 is bent. I can't get caught. Therefore, stable development processing is performed.

The developer 24 overflowing from the first developer tank 14 and discharged into the overflow tank 18 is inserted into the discharge tank 116 from the gas pipe 114 .

The 23rd plate 12 processed by being conveyed in the first developer tank 14 is almost completely developed, and then passes through the second developer tank 16 to be additionally developed.

Further, the 23rd plate 12 is squeezed when being conveyed by the pair of conveying rollers 46 in the developer 24 in the first developing tank 16.
Immediately thereafter, the developer 24 is sprayed by the spray pipe 60.54, and the developer in the first developer tank 14 is circulated.

The developer 24 that overflows from the first developer tank 14 and is discharged into the overflow tank 18 passes through the pipe line 84 by the pump 86 and is supplied again into the first developer tank 14, so that the developer 24 can be effectively used. can be used.

The 23rd printing plate 12 sent out from the first developing tank 14 is conveyed while being nipped by a pair of conveying rollers 106 , the developers 2 and 4 are squeezed out, and the plate 12 is sent out between a pair of conveying rollers 118 . The toner is sent out toward a pair of transport rollers 118 and transported in a substantially horizontal direction above the second developer tank 16 while being guided by guide rollers 126 .

During this conveyance, a developer is discharged and coated onto both sides of the 23rd plate 12 by the spray pipes 120 and 128. As a result, the 23rd plate 12 is completely developed.

The developing solution in the first developing tank 14 becomes exhausted due to the development process of the 23rd plate 12, and this exhausted developing solution 24 is discharged from the overflow tank 18 through the pipe line 134 into the discharge tank 116.

Further, the developing stock solution and water are replenished into the second developing tank 16 by the processing replenishment controller 164.
6, the developer is replenished into the first developer tank 14. As a result, the 23rd plate 12 to which the developer is applied in the second developer tank 16
has been developed in advance in the first developer tank 14, so there is little deterioration due to processing of the developer in the second developer tank 16. Therefore, since the developer 24 in the second developer tank is supplied into the first developer tank 14, the developer can be used for a long period of time, and long-term running is possible.

Further, since the upper surface of the developer 24 is covered by the liquid level lid 102, deterioration of the developer due to air can be reduced, and evaporation of the developer can be reduced.

Next, replenishment of the developing device 24 will be explained.

When a large number of 23 plates 12 are developed in the first developer tank 14, the developer becomes exhausted. The degree of fatigue of the developer can be determined by detecting the area of the 23 plates 12 to be processed by the detector 174, calculating by the processing replenishment controller 164, and replenishing the developer to prevent deterioration of the developer.

That is, the detector 174 detects 1. 23rd edition 1 inserted
Based on this detection result, the processing replenishment controller 164 calculates the operation time of the stock solution supply pump 132 and the water supply pump 136, and supplies the stock solution in an amount corresponding to the area of the plate 12. Supply pump 13
2. The water supply pump 136 is activated.

Further, the electrical conductivity of the developing solution 24 is detected by the electrical conductivity detector 96, and when the developing solution 24 is concentrated and the electrical conductivity increases and reaches a predetermined value or more, the electrical conductivity replenishment controller 176 is activated to supply water. The pump 92 is operated to supply the first developer tank 14 . In addition, the amount of water evaporated into the second developer tank 18 and finisher tank 24 is measured in advance, and the second developer water supply pump 136 and finisher water supply pump 168 are operated in proportion to the operation of the water supply pump 92. let This water replenishment amount is set to 1Qcc to 100Qcc/time.

Further, the finisher tank 20 is refilled with the finisher stock solution and water at a constant rate by the processing replenishment controller 164 using the finisher stock solution supply pump 162 and the water supply pump 168.

This prevents the developer 24 and finisher solution 152 from concentrating, and in addition to the area replenishment, the activity of the developer solution 24 and finisher solution 152 is kept constant, making it possible to perform stable development over a long period of time.

Next, other examples of bending prevention means will be explained using FIGS. 4 to 6.

As shown in FIG. 4, the vignetting prevention rod 190 has one end supported by the rotating shaft 42A of the guide roller and the other end formed long along the width direction of the PS plate 12. A portion 192 is formed. The tip portion 194 of this flat portion is located near the brushes 62, 78 as in the previous embodiment.

Since the outer shape of the shading prevention rod 190 is made of wire, it is lightweight.

Further, as shown in FIG. 5, one end of the curvature prevention rod 196 is fixed to the support shaft 42A of the guide roller 42. The middle part is bent to form a flat part, and the tip part is located close to the brushes 62, 78.

As shown in FIG. 6, a shading prevention body 202 whose external shape is formed by a rod 200 has a wire mesh 204 attached to a flat surface thereof.

In this embodiment, a photosensitive lithographic printing plate was used as an example of the photosensitive material, but the present invention is not limited to this, and the present invention can be applied to the development of other photosensitive materials such as waterless lithographic printing plates and other photosensitive recording materials. I can do it.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing an embodiment of a photosensitive planographic printing plate processing machine according to the present invention, Fig. 2 is a perspective view showing an vignetting prevention plate, and Fig. 3 shows the relationship between the brush and the vignetting prevention plate. cross section,
4 to 6 are perspective views showing other examples of bending prevention means. DESCRIPTION OF SYMBOLS 10... Photosensitive planographic printing plate processing machine, 12... Photosensitive planographic printing plate (28th plate), 14... First developer tank, 16... Second developer tank, 18... Overflow tank , 20... Finisher 24... Developer, 62.78... Brush, 80... Edge prevention plate, 190... Edge prevention rod, 196... Edge prevention rod, 202...Killing prevention body.

Claims (1)

[Claims] (1) A photosensitive material processing device that automatically transports and immerses an image-exposed photosensitive material in a processing solution and processes it while rubbing it with a rubbing brush, one end of which is disposed near the rubbing brush, and the other end of which is disposed near the rubbing brush. A bending prevention means is provided, which is disposed on the downstream side in the conveying direction of the photosensitive material and supports the rear end of the photosensitive material that has passed the brush, thereby preventing the rear end of the photosensitive material from being bent by the brush. Photosensitive material processing equipment.