JPH04280251A - Photosensitive planographic plate processing device - Google Patents

Abstract

PURPOSE:To provide a photosensitive planographic plate processing device the internal pipeline of which is simplified. CONSTITUTION:A photosensitive planographic plate processing device 10 has a first developing tank 12 and second developing tank 14 for developing a PS plate P, and an overflow tank 20 is disposed between the first developing tank and second developing tank to receive a developing solution overflown from the first developing tank and second developing tank. The overflow tank and the first developing tank are allowed to communicate to each other through a pipeline 48 and a pump 48A, and the treating solution stored in the overflow tank is supplied to the first developing tank. The overflow tank has an overflow pipe 46, and the developing solution of a determined level or more is discharged from the overflow tank.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a photosensitive lithographic printing plate processing apparatus for processing a photosensitive lithographic printing plate on which an image has been printed, and more particularly to a photosensitive lithographic printing plate processing apparatus that processes a photosensitive lithographic printing plate with a plurality of developing tanks. Related to plate processing equipment.

0002

[Prior Art] A photosensitive planographic printing plate on which an image has been printed in a printing device is sent to a photosensitive planographic printing plate processing device, developed in a developing tank of the photosensitive planographic printing plate processing device, and then processed in a rinsing tank or a water washing tank. After being washed with water, a finisher liquid is applied in a rinsing bath or a desensitization treatment bath to protect the surface of the treated photosensitive lithographic printing plate.

[0003] While the photosensitive lithographic printing plate is conveyed into the developer tank, it is immersed in a developer or the developer is sprayed onto the surface to be developed. For example, as described in Japanese Utility Model Publication No. 60-35072, a processing apparatus has been proposed that divides the developing process into at least two parts and changes the developing time into multiple stages. As the photosensitive lithographic printing plate is developed, the developer gradually becomes exhausted, but the developer replenisher is supplied from the replenisher to the developer tank of the processing device.

For example, as shown in FIG. 2, there is a first developing tank 82 which serves as a development treatment tank in which the photosensitive planographic printing plate P is immersed in a developer, and a first developing tank 82 in which the photosensitive planographic printing plate P is processed by immersing the photosensitive planographic printing plate P in a developer. A photosensitive lithographic printing plate processing apparatus 80 has been proposed which is provided with a second developer tank 84 that ejects water toward the surface. Furthermore, between the first developer tank 82 and the second developer tank 84,
The first developer tank 84 squeezes and stores the developer that has adhered to the photosensitive planographic printing plate P, and the overflow tank 86 stores the developer that overflows from the first developer tank 82.
is provided.

In this photosensitive planographic printing plate processing apparatus 80,
A transport path for the photosensitive lithographic printing plate P is formed by a plurality of skewer rollers 88, brush rollers 90, and a squeeze roller pair 92, and each processing tank is replenished with processing liquid by a pump via piping. The treatment liquid is circulated by a pump and a pump.

This overflow tank 86 and the first developer tank 8
2, there is a pipe 9 with a pump 96A installed in the middle part.
6, and the developer overflowing into the overflow tank 86 is sent back to the first developer tank 82. Further, the overflow tank 86 is provided with an overflow pipe 86A, which discharges a predetermined amount or more of the developer as waste liquid to a waste liquid tank (not shown).

[0007] Also, this photosensitive planographic printing plate processing device 80
Now, when replenishing the developer replenisher from the developer replenisher tank 97, the second developer tank 84 is replenished, and then the pump 98A is used to replenish the developer replenisher through the pipe 98 that communicates the second developer tank 84 and the first developer tank 82. A part of the processing liquid stored in the second developer tank 84 is supplied as a developer to the first developer tank 82 . Further, the second developer tank 84 is provided with an overflow pipe 84A for supplying a developer replenisher and discharging the developer in excess of a predetermined amount as waste to a waste solution tank (not shown). In addition, the concentration of each treatment liquid is determined by the water tank 9.
It is regulated by water supplied from 9.

[0008]

However, in the processing apparatus described above, the processing solution is not conveyed through the piping for each developer between the first developing tank 82, the second developing tank 84, and the overflow tank 86, and through each piping. The structure is complicated because it is necessary to arrange a large number of pumps for supplying the water, and there is also the problem that the product cost increases due to the piping and pumps.

In consideration of the above facts, the present invention aims to provide a photosensitive lithographic printing plate processing apparatus in which the piping is simplified without deteriorating the function of each developing tank and the number of pumps is reduced. .

0010

[Means for Solving the Problems] A photosensitive lithographic printing plate processing apparatus according to the present invention is a photosensitive lithographic printing plate processing apparatus that processes a photosensitive lithographic printing plate on which an image is recorded with a processing liquid while conveying it. a first developer tank for developing the photosensitive printing plate with a developer; and a first developer tank disposed downstream of the first developer tank and replenishing with a developer replenisher, and for developing the photosensitive lithographic printing plate with a developer. a second developer tank for performing development; and an overflow disposed between the first developer tank and the second developer tank to store the developer overflowing from the first developer tank and the second developer tank. The developing device is characterized by having a tank, a supply means for supplying the developer from the overflow tank to the first developer tank, and a discharge means for discharging the developer overflowing from the overflow tank.

[0011]

[Operation] In the photosensitive planographic printing plate processing apparatus having the above structure, the photosensitive planographic printing plate is developed using the first and second developing tanks. An overflow tank is provided between the first and second developer tanks to collect the developer overflowing from each tank. The developer collected in this overflow tank is returned as a developer to the first developer tank by a supply means, and a part of the developer collected in the overflow tank is discharged all at once from the overflow tank by a discharge means. are doing.

A new developer replenisher is always supplied to the second developer tank, and the overflow developer from the first developer tank and the second developer tank is collected in the overflow tank.

[0013] It is possible to eliminate the need for an overflow piping for the second developing tank and to supply the developer from the second developing tank to the first developing tank without deteriorating the function of the photosensitive lithographic printing plate processing apparatus. Piping and pumps can be eliminated. As a result, a photosensitive lithographic printing plate processing apparatus with simplified internal piping and reduced number of pumps can be obtained.

[0014]

Embodiment FIG. 1 shows a photosensitive planographic printing plate processing apparatus 10 according to this embodiment.

This photosensitive lithographic printing plate processing apparatus 10 includes:
A first developer tank 12, a second developer tank 14 for processing a photosensitive planographic printing plate P (hereinafter referred to as PS plate P) on which an image has been printed by a printing device (not shown), and a finisher liquid for the developed PS plate P. A finisher tank 16 for coating the PS plates P is disposed, and a drying section 18 for drying the PS plate P treated with each treatment liquid is disposed downstream of the finisher tank 16. Further, an overflow tank 20 is provided between the first developer tank 12 and the second developer tank 14.

A plurality of guide rollers 22 are provided on the upstream side of the first developing tank 12 of the photosensitive planographic printing plate processing apparatus 10, and the insertion opening 24 of the photosensitive planographic printing plate processing apparatus 10 is provided with a plurality of guide rollers 22.
The PS plate P inserted from there is fed diagonally downward into the first developing tank 12.

In the first developer tank 10, a guide 26, a squeeze roller pair 28, skewer rollers 30, 32, and a brush roller 34 are arranged along the transport path of the PS plate P, respectively. These rollers convey the PS plate P within the first developer tank 12 and further carry it out from the first developer tank 12 by being transmitted with the driving force of a drive means (not shown).

The first developer tank 12 is filled with a developer for developing the PS plate P, and the rear side is bent outward so that overflowing developer can be discharged to an overflow tank 20 on the rear side. ing. Furthermore, the first developer tank 12 is provided with a floating lid 12A to prevent the developer from coming into contact with the atmosphere.

A spray pipe 36 is arranged at the axial center of the skewer roller 30, and a spray pipe 36 is also arranged above the skewer roller 30. These spray pipes 36 are connected to piping 38 that communicates with the bottom of the first developer tank 12 . A filter 38A, a pump 38B, and a conductivity sensor 38 are located in the middle of this piping 38.
C is provided. Spray pipe 36 is pump 38
By the operation of B, the developer stored in the first developer tank 12 is transferred to P.
It is configured to eject toward the surface of the S plate P. Further, the conductivity sensor 38C measures the conductivity of the developer stored in the first developer tank 12, and operates the pump 42A provided in the piping 42 (only a part of which is shown) communicating with the water tank 40. is supplied so that the developer has a predetermined concentration.

A squeezing roller pair 44 is arranged above the overflow tank 20 located downstream of the first developing tank 12, and the lower end of the lower roller of this squeezing roller pair 44 is connected to the overflow tank 20. It is immersed in developer solution stored in Further, one end of an overflow pipe 46 is disposed near the lower end of the pair of squeeze rollers 44, which serves as a means for discharging the developer and communicates with a waste liquid tank (not shown), so that the developer stored in the overflow tank 20 can be kept at a predetermined level. When the amount exceeds that level, it is discharged as an overflow liquid.

A pipe 48 communicating with the bottom of the first developing tank 12 is provided at the bottom of the overflow tank 20, and a pump 48A is provided in the middle of the pipe 48. The developer stored in the overflow tank 20 via the piping 48 is transferred to the first developer tank 1 by driving the pump 48A.
Returned to 2.

Two pairs of squeezing rollers 44 are disposed above the second developing tank 14 located downstream of the overflow tank 20.
A skewer roller 30 is arranged between the squeezing rollers. The lower end of the lower roller of the squeezing roller pair 44 is
It is immersed in a developer stored in a second developer tank 14. Further, a spray pipe 50 is arranged at the axial center of the skewer roller 30 and above the skewer roller 30 .

A pipe 52 communicating with the bottom of the second developer tank 14 is connected to these spray pipes 50.
2, a filter 52A and a pump 52B are provided. In the second developing tank 14, the pump 52B operates to spray developer from the spray pipe 50 onto the lower surface on the downstream side and the upper surface on the upstream side of the PS plate P. P developed at 12
The S plate P is additionally developed in the second developing tank 14.

The second developer tank 14 is provided with a pipe 56 communicating with the developer replenishment tank 54 and a pipe 58 (only a portion of which is shown) communicating with the water tank 40. Pumps 56A and 58 are installed in the intermediate portions of these pipes 56 and 58, respectively.
A is provided.

Pumps 56A and 58 are connected to the second developing tank 14.
A developer replenisher and water are supplied through pipes 56 and 58. Further, the second developer tank 14 is configured to be replenished with a developer replenisher so that the overflowing developer flows into the overflow tank 20 . Also,
In the second developer tank 14 , the developer jetted from the spray pipe 50 is squeezed by a squeeze roller pair 44 .

A finisher tank 16 is provided downstream of the second developer tank 14. A skewer roller 30 and a squeezing roller 44 are provided at the upper part of the finisher tank 16, and a spray pipe 60 is arranged at the axial center of the skewer roller 30 and above the skewer roller 30. These spray pipes 60 are connected to piping 62 that communicates with the bottom of the finisher tank 16 and is provided with a filter 62A and a pump 62B in the middle. As the pump 62B operates, the finisher liquid stored in the finisher tank 16 is sprayed from the spray pipe 60 toward the surface of the PS plate P.

As a result, in the finisher tank 16, the surface of the PS plate P is rinsed and the processed plate surface is protected. The spray pipe 60 disposed above the skewer roller 30 is provided with a reflection plate 60A, and the processing liquid spouted from the spray pipe 60 is received by the reflection plate 60A and directed to the surface of the PS plate P. It is meant to be washed away.

A pump 66 is connected to the finisher tank 16 from the other end of a pipe 66 which has one end connected to the finisher replenisher tank 64 and a pump 66A provided in the middle.
The finisher liquid flows into the finisher tank 1 due to the operation of A.
6 will be replenished. Further, the finisher liquid that overflows due to replenishment is discharged to a waste liquid tank (not shown) via an overflow pipe 68.

In the drying section 18 disposed on the downstream side of the finisher tank 16, the PS plate P is conveyed by a plurality of skewer rollers 70, and the hot air discharged from the hot air outlet 72 is transferred to the PS plate.
P treated with each treatment liquid by spraying onto the surface of the plate P
The S plate P is dried.

The PS plate P dried in the drying section 18 is
It is discharged from the discharge port 74 to the outside of the photosensitive planographic printing plate processing apparatus 10 .

[0031] Furthermore, the piping 38 connected to the bottom of each treatment tank
, 48, 52, and 62, there is a drain valve 76.
and a drain pipe 78 are connected, so that the processing liquid in each of the pipes 38, 48, 52, 56 and each processing tank can be discharged.

Next, the operation of the photosensitive planographic printing plate processing apparatus 10 according to this embodiment will be explained.

Photosensitive lithographic printing plate processing apparatus 10 shown in FIG.
The image is printed on the P by a printing device (not shown).
The S plate P is supplied from the insertion port 24. This PS version P is
The guide roller 22 transports the image diagonally downward toward the first developer tank 12 .

In the first developer tank 12, the PS plate P is conveyed by the squeezing roller 28, skewer rollers 30, 32, and brush roller 34, while the developer is sprayed from the spray pipe 36 toward the surface of the PS plate P. ing. The PS plate P is developed in the first developer tank 12 using this developer.

The PS plate P carried out from the first developing tank 12 has the developer attached thereto wiped off by the squeezing roller 44 of the overflow tank 20.

In the second developing tank 14 disposed after the overflow tank 20, the PS plate P is held and conveyed by a squeeze roller 44. The PS plate P is developed by spraying a developer stored in the second developing tank 14 from the spray pipe 50 toward the surface thereof.

The PS plate P developed in the second developing tank 14 is
The developer adhering to the surface is squeezed out by a squeezing roller 44 and sent to the finisher tank 16.

In the finisher tank 16, the surface of the PS plate P is treated with a finisher liquid that is sprayed from a spray pipe 60 toward the surface, and the finisher liquid that has adhered to the surface is squeezed out by a squeezing roller 44.

PS plate P processed in finisher tank 16
is sent to the drying section 18 and subjected to drying processing. In the drying section 18 , hot air is blown toward the surface of the PS plate P to perform a drying process, and the dried PS plate P is discharged from the discharge port 74 .
From there, it is discharged to a pedestal (not shown) provided outside the photosensitive planographic printing plate processing apparatus 10.

Next, the supply of developer to the photosensitive planographic printing plate processing apparatus 10 will be explained.

In this embodiment, the second developer tank 14 is replenished with developer replenisher and water at a ratio of 1:1. The developer overflowing from the first developer tank 12 and the second developer tank 14 to the overflow tank 20 is returned to the first developer tank via the pipe 48 and the pump 48A.

The first developing tank 12, second developing tank 14, and finisher tank 16 of the photosensitive lithographic printing plate processing apparatus 10 are filled with the processing liquid of each processing tank before starting the processing.

The second developer tank 14 includes a developer replenisher tank 5.
4 through the piping 56 by the operation of the pump 56A, and water is supplied from the water tank 40 through the piping 42 by the operation of the pump 58A to replenish the second developer tank 14. is maintained at a predetermined concentration.

By replenishing the second developer tank 14 with the developer replenisher, the developer overflows into the overflow tank 20.

The overflow tank 20 stores the developer overflowing from the first developer tank 12 and the second developer tank 14, and the developer in the overflow tank 20 is pumped through the pipe 48 by the operation of the pump 48A. One developer tank 12 is supplied.

[0046] If the conductivity value detected by the conductivity sensor 38C deviates from the predetermined range due to evaporation of water,
Water is supplied from the water tank 40 to the first developer tank 12 via a pipe 42 and a pump 42A (not shown), so that the concentration of the developer in the first developer tank 12 becomes a predetermined concentration.

In the first developer tank 12, the stored developer is supplied to the spray pipe 36 by the pump 38B and sprayed out toward the surface of the PS plate P, thereby circulating the developer in the first developer tank 12. .

When the PS plate P is carried out from the first developing tank 12, the developer attached to the PS plate P is transferred to the overflow tank 20.
The water is squeezed out by the squeezing roller 44 and stored in the overflow tank 20. First developer tank 12 and second developer tank 14
The developer overflowing from the tank is also transferred to the overflow tank 20.
stored in As a result, when the developer in the overflow tank 20 reaches a predetermined amount, the overflow pipe 46
The liquid is discharged as waste liquid to a waste liquid tank (not shown).

As described above, in the photosensitive planographic printing plate processing apparatus 10 according to this embodiment, the developer is supplied to the second developer tank 14,
While storing the developer overflowing from the first developer tank 12 and the second developer tank 14 in the overflow tank 20,
The stored developer is supplied from the overflow tank 20 to the first developer tank 12 . Further, the developer overflowing from the overflow tank 20 is discharged as waste liquid via an overflow pipe 46.

That is, a relatively new developer is stored in the second developer tank 14 disposed on the downstream side of the transport path of the PS plate P, and an overflow tank 20 is stored in the first developer tank 12. Developing solution is supplied through. A developer solution of a predetermined level or higher is discharged from the overflow tank 20 via an overflow pipe 46.

[0051] This allows the overflow pipe of the second developer tank 12 to be omitted. Furthermore, the piping and pump that conventionally supplied processing liquid from the second developer tank 14 to the first developer tank 12 are no longer necessary. That is, compared to the conventional example, it is possible to reduce the overflow pipe of the second developer tank, the piping and the pump between the first developer tank and the second developer tank, and thereby the photosensitive lithographic printing plate processing apparatus 10 piping can be simplified and the number of pumps can be reduced, so product costs can be lowered.

Furthermore, in this embodiment, the overflow tank 2
Since a part of the squeeze roller 44 of the zero and second developing tanks 14 is always immersed in the developer, the surface of the squeeze roller 44 is prevented from drying, and the developer attached to the roller surface dries and becomes solid. This will prevent you from doing so. Therefore, cleaning of the squeezing roller 44 becomes easy, and it is possible to prevent dirt stuck to the surface of the squeezing roller 44 from adhering and being transferred to the surface of the PS plate P that is transported and developed.

In this embodiment, the finisher tank 16
Although the finisher liquid is applied to the PS plate P, the photosensitive lithographic printing plate processing apparatus may be provided with a separate finisher tank. Furthermore, PS according to this example
The plate P may be of a negative type or a positive type.

In this embodiment, if the conductivity value detected by the conductivity sensor 38C is out of a predetermined range, water is replenished from the water tank 40 to the first developing tank 12 via the piping 42 and the pump 42A. However, it is also possible to display the conductivity value on a display and manually add water to bring it within a predetermined conductivity range.

[0055]

Effects of the Invention As explained above, the photosensitive lithographic printing plate processing apparatus according to the present invention includes an overflow tank provided between the first developer tank and the second developer tank, and an overflow tank provided between the first and second developer tanks. The overflowing developer is collected and supplied to the first developer tank by a supply means. Further, the developer replenisher is supplied to the second developer tank, and the developer is discharged all at once by a discharge means provided in the overflow tank.

[0056] This simplifies the piping of the first and second developing tanks, reduces the number of pumps for supplying the developer, and has the excellent effect of lowering product costs.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing a photosensitive lithographic printing plate processing apparatus according to the present embodiment.

FIG. 2 is a schematic configuration diagram similar to FIG. 1 showing a conventional example.

[Explanation of symbols]

10 Photosensitive planographic printing plate processing device 12 First developer tank 14 Second developer tank 20 Overflow tank 38C, 42A, 52B, 56A, 58A, 62B, 6
6A pump 48A Pump (supply means) 38, 42, 52, 56, 58, 62, 66 Piping 48 Piping (supply means) 46 Overflow pipe (discharge means) 68
Overflow pipe 28, 44 Squeezing roller

Claims (1)

[Claims] 1. A photosensitive lithographic printing plate processing device that processes a photosensitive lithographic printing plate on which an image has been recorded with a processing liquid while conveying the plate, the first developing step developing the photosensitive printing plate with a developer. a second developer tank, which is disposed downstream of the first developer tank and is replenished with a developer replenisher and develops the photosensitive lithographic printing plate with the developer; the first developer tank and the second developer tank; an overflow tank that is arranged between the second developer tank and stores the developer overflowing from the first developer tank and the second developer tank, and supplies the developer from the overflow tank to the first developer tank. A photosensitive lithographic printing plate processing apparatus comprising: a supply means for discharging the developer overflowing from the overflow tank; and a discharging means for discharging the developer overflowing from the overflow tank.