JPH04328558A - Device for processing photosensitive planograhic printing plate - Google Patents

Abstract

PURPOSE:To improve stirring efficiency so as to eliminate precipitate and to improve the temp. control accuracy and temp. elevation characteristic of a processing liquid. CONSTITUTION:Circular holes 200 are provided at a prescribed pitch size on a spray pipe 60 and circular holes 202 are provided at the same pitch size as the pitch size of the circular holes 200 on the spray pipe 54. The ejection directions of the developers by the spray pipes 54, 60 are arranged zigzag from each other in the axial direction of the spray pipes 54, 60. The developers ejected from the circular holes 200, 202 do not, therefore, interfere with each other and do not negate the discharge pressures with each other in the state of not transporting PS plate. The stirring efficiency is consequently improved and the developers are stirred. The stagnation of the precipitate in the bottom of a developing tank does not arise any more. The spraying of a large amt. of the precipitate to the plate surfaces of the PS plates is thereby obviated. Further, the temp. control accuracy of the developers is improved and the temp. elevation characteristic is improved.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive lithographic printing plate processing apparatus having a circulation mechanism for treating a photosensitive lithographic printing plate on which an image has been printed with a processing liquid in a processing tank and for circulating the processing liquid.

0002

2. Description of the Related Art A photosensitive lithographic printing plate on which an image has been printed by a printing device is sent to a photosensitive lithographic printing plate processor for processing.

[0003] Such photosensitive lithographic printing plates include those in which a photosensitive material is coated on one or both surfaces of a rigid support such as an aluminum plate or a plastic plate.

[0004] A photosensitive lithographic printing plate processing machine is equipped with all or part of a developing tank, a washing tank, a rinsing tank, a desensitizing tank, etc. in this order. liquid is contained. The photosensitive lithographic printing plate is sequentially conveyed to each of these processing tanks, and is treated by being immersed in each of the processing liquids or by supplying each of these processing liquids to the surface of the photosensitive lithographic printing plate.

[0005] The processing liquid is circulated and agitated by a circulation mechanism constituted by a circulation pump or the like. In this circulation mechanism, a pair of spray pipes are disposed with a transport path for the photosensitive planographic printing plate sandwiched therebetween. The spray pipe is formed with a plurality of ejection nozzles, each of which is directed toward the surface of the photosensitive lithographic printing plate. Here, the processing liquid in the processing tank is sent to a spray pipe by a circulation pump, and is sprayed onto the plate surface of the photosensitive lithographic printing plate from an ejection nozzle.

In addition, especially when the photosensitive planographic printing plate is not processed, the spray effect of the processing liquid from this jet nozzle agitates the processing liquid, improving the temperature rise characteristics of the processing liquid and improving the temperature control accuracy. It's improving.

[0007]

[Problem to be Solved by the Invention] However, since the ejection nozzles formed in each spray pipe are opposed to each other, in the absence of a photosensitive planographic printing plate, their ejection forces are canceled out by each other's ejection pressure, making it difficult to improve efficiency. A problem arises in that the processing liquid cannot be stirred well. As a result, the temperature rise characteristics of the processing solution deteriorates, temperature control accuracy decreases, and sludge-like residue such as dissolved residual dust of the photosensitive layer of the photosensitive lithographic printing plate and precipitates of the developer solution forms at the bottom of the processing tank. May precipitate.

In consideration of the above facts, the present invention provides a photosensitive lithographic printing plate processing apparatus that can improve stirring efficiency, eliminate precipitates, improve temperature rise characteristics of processing liquid, and improve temperature control accuracy. The purpose is to obtain.

[0009]

[Means for Solving the Problems] The invention as set forth in claim 1 provides a pair of photosensitive planographic printing plates provided on both sides of a transport path for photosensitive planographic printing plates in a processing tank for processing photosensitive planographic printing plates on which images are printed. In a photosensitive planographic printing plate processing apparatus having a spray pipe provided with a plurality of jetting nozzles for spouting a processing liquid, the jetting directions of the processing liquid spouted from the jetting nozzles of the respective spray pipes are arranged so as not to intersect with each other. It is a feature.

[0010] The invention according to claim 2 is characterized in that the ejection nozzles of each of the spray pipes are arranged in a staggered manner along the axial direction of the spray pipe.

[0011] The invention according to claim 3 is characterized in that the ejection direction of the ejection nozzle is substantially parallel and directed toward the bottom of the processing tank.

0012

According to the first aspect of the invention, since the directions of the processing liquids ejected from the ejection nozzles of the respective spray pipes do not intersect, the discharge pressures do not cancel each other out and the flow velocity does not decrease. Therefore, the efficiency of stirring the processing liquid is improved, and the temperature rise characteristics are improved. This stirring effect also improves temperature control accuracy. Furthermore, since there is no precipitate, there is no possibility that residue will adhere to the surface of the photosensitive lithographic printing plate when the processing liquid is sprayed onto the surface of the plate.

According to the second aspect of the invention, the jet nozzles are arranged alternately along the axial direction of the spray pipe, that is, in a staggered manner, so that their discharge pressures do not cancel each other out.

According to the third aspect of the invention, since the jet direction from the jet nozzle is directed toward the bottom of the processing tank, it is possible to improve the stirring efficiency of the processing liquid without reducing the developing efficiency, and to Precipitates can be prevented from accumulating on the surface.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a photosensitive lithographic printing plate processing apparatus 10 according to the present invention.

The photosensitive planographic printing plate processing apparatus 10 includes a developing tank 14 for developing a photosensitive planographic printing plate (hereinafter referred to as "PS plate") 12 on which an image has been printed by a printing device (not shown), and a developing tank 14 for developing the photosensitive planographic printing plate (hereinafter referred to as "PS plate"). A developer recovery tank 16 for collecting the developer overflowing from the tank 14, a washing tank 18 for washing the developer attached to the PS plate 12, and a desensitizing tank 18 for applying a desensitizing treatment liquid to the PS plate 12. A processing tank 20 is provided.

As shown in FIG. 1, the PS to the developer tank 14 is
A pair of conveyance rollers 22 is arranged on the insertion side of the plate 12. A PS plate 12 on which an image has been printed by a printing device (not shown) is inserted between the pair of transport rollers 22 .

The developing tank 14 has an approximately inverted mountain shape with an open top and a bottom central portion protruding downward. The developing tank 14 contains a developing solution. Developer tank 14
Inside, along the bottom wall are guide rollers 24, 26, 28,
34, 36, 38, and 40 are arranged. These guide rollers 24 to 40 form skewer-shaped rollers in which a plurality of elastic rotating members are supported by shafts, and the shafts thereof are supported by being stretched between a pair of side plates (not shown).

Further, a guide roller 42 having a larger diameter than the guide roller 24 is arranged above the guide roller 24, a guide roller 44 is arranged above the guide roller 38, and a guide roller 46 is arranged above the guide roller 40. It is located. These guide rollers 42, 44, and 46 are skewer-shaped rollers like the guide rollers 24 to 40, and are supported by a pair of side plates (not shown).

A guide roller 2 is installed in the center of the developing tank 14.
A pair of conveyance rollers 48 is arranged between the conveyance roller 8 and the guide roller 34 . Like the guide rollers 24 to 46, the pair of conveyance rollers 48 are rotatably supported by the side plates, and are rotated by the driving force of a driving means (not shown) transmitted thereto.

A pair of conveyance rollers 48 and guide rollers 34
A guide roller 32 is arranged between them. The guide roller 32 forms a skewer-shaped roller in which a plurality of elastic rotating members are pivotally supported on the outer periphery of the roller shaft. Guide roller 3
The second roller shaft is made of a hollow pipe, and forms a spray pipe 54 with a discharge port opened between the elastic rotating members along the axial direction. The guide roller 32 is a skewer-shaped roller that also serves as a spray pipe.

Guide roller 28 and pair of conveyance rollers 48
A guide roller 30 is arranged between them, and is formed to have a larger diameter than the guide rollers 24 to 40. The guide roller 30 is a skewer-shaped roller and is supported by a pair of side plates like the guide rollers 44 to 46. A guide 52 is attached to the shaft of the guide roller 30 via a bracket 50. One end of this guide 52 is arranged toward the pair of conveyance rollers 48 . For this reason, the leading edge of the PS plate 12 is guided between the pair of transport rollers 48.

Therefore, the PS plate 12 which has been sandwiched and conveyed between the pair of conveyance rollers 22 and inserted into the developer tank 14 is conveyed diagonally through between the guide rollers 24 and 42, and is conveyed diagonally to the guide rollers 26, 28, 30, it is guided by the guide 52 and lowered obliquely, and is inserted between the pair of conveyance rollers 48. After passing between the pair of conveyance rollers 48, it is guided by guide rollers 32, 34, 36, 38, and 40 and rises diagonally, and is guided by guide roller 46 and sent above the developer recovery tank 16. ing. This allows P.S.
The plate 12 is immersed in a developer in a developer tank 14 to be developed.

A bent portion bent toward the outside of the developing tank 14 is formed on the downstream side wall of the developing tank 14 in the transport direction of the PS plate 12, and the height of this bent portion in the vertical direction is larger than that of the PS plate 12. It is lower than the side wall on the upstream side in the conveyance direction. Therefore, when the developer tank 14 is full and overflows, it overflows the bent portion and is always collected into the developer recovery tank 16.

A spray pipe 54 has a plurality of discharge ports formed along the axial direction of the roller shaft of the guide roller 32.
is in communication with one end of the conduit 56. The other end of the conduit 56 penetrates the bottom of the developer tank 14 and opens into the developer tank 14 . A circulation pump 58 is disposed in the middle of the pipe line 56, so that the developer in the developer tank 14 is supplied to the spray pipe 54.

A spray pipe 60 is also arranged above the guide roller 32. This spray pipe 60
is provided with a plurality of discharge ports opening along the axial direction. This spray pipe 60 is also communicated with the conduit 56, and the developer in the developer tank 14 is supplied by operation of the circulation pump 58.

Spray pipe 54 and spray pipe 60
The developing solution is supplied at a predetermined pressure by a circulation pump 58.

As shown in FIG. 5(A), the spray pipe 60 is provided with circular holes 200 communicating with the inside at a predetermined pitch along the axial direction, and serves as a spray nozzle. are doing. That is, the spray pipe 60
The developer flowing therein is ejected from the circular hole 200 at a predetermined ejection pressure. The axis of the circular hole 200 is slightly inclined toward the upstream side in the conveying direction with respect to the plate surface of the PS plate 12 being conveyed (see FIGS. 5(B) and (C)).

PS supported by guide roller 32
The spray pipe 54 disposed below the plate 12 is provided with circular holes 202 along its axial direction that communicate with the inside and have the same pitch as the circular holes 200 . This circular hole 202 also has a role as an injection nozzle. The axis of the circular hole 202 is slightly inclined toward the upstream side in the conveyance direction with respect to the plate surface of the PS plate 12 being conveyed (see FIGS. 3(B) and (C)), and the spray pipes 54, 60
When viewed from the axial direction, the direction intersects with the jetting direction from the circular hole 200. However, as shown in FIG. 3(A), one circular hole 200 is located at an intermediate position between the other circular holes 202, and they are staggered in the axial direction, resulting in a so-called staggered arrangement. That is, as shown in FIGS. 3(B) and 3(C), in the axis-perpendicular cross section of the spray pipes 54 and 60 passing through the axis of one circular hole 200, the other circular hole 200
02 is not shown in the figure, and it can be seen that the directions in which the developer is ejected from the circular holes 200 and 202 do not overlap in the axial direction of the spray pipes 54 and 60. Therefore, even when the PS plate 12 is not being transported, the discharge pressures of the developer jetted from the circular holes 200 and 202 do not cancel each other out, and the flow of the developer is smooth.

Further, in the middle of the pipe line 56, a filter 156 housed in a housing 158 is disposed upstream of the circulation pump 58, as shown in FIG.

As shown in FIG. 2, housing 158
The bottom of the housing 158 is in communication with the bottom of the developer tank 14 , and the middle part of the housing 158 is in communication with the suction side of the circulation pump 58 . Therefore, by operating the circulation pump 58,
The developer sucked from the bottom of the developer tank 14 is transferred to the housing 1.
The liquid passes through the filter 156 in the developer tank 58 and is sucked into the circulation pump 58, and is sent out from the discharge port of the circulation pump 58 to spray pipes 60 and 54 installed in the developer tank.

Furthermore, the pipe line communicating with the bottom of the housing 158 is branched into two, and a valve 160 is disposed in one of the two branches. By opening this valve 160, the developer in the pipe line 56, housing 158, and pipe line 162 is discharged. During this discharge,
The dirt adhering to the filter wall that is removed by the filter is discharged together with the developer because the developer flows backward. When the circulation pump 58 is in operation, the filter 156 is
The developer is sucked in from the inside of the pump 6, passes to the outside, and is sucked into the suction side of the circulation pump 58.

A nylon mesh filter is used for this filter 156, and the mesh number is #100.
~ #500 is used, more preferably #
400 are used. Note that the number after # indicates the pore diameter (unit: μ) of the filter.

Further, one end of a conduit 64 communicating with a developer replenishment tank 62 is opened above the developer tank 14. A replenisher pump 66 is disposed in the middle of this conduit 64. Further, one end of a pipe 70 communicating with a water supply tank 68 is opened above the developer tank 14.
A water supply pump 72 is disposed in the middle of 0. These replenisher pump 66 and water supply pump 72 supply the developer replenisher (undiluted solution) in the developer replenishment tank 62 and the water supply tank 68.
The water inside is supplied to the developer tank 14 at a predetermined ratio.

Further, one end of a conduit 74 is open above the developer tank 14. The other end of the pipe 74 penetrates the bottom of the developer recovery tank 16 and opens into the developer recovery tank 16 . Further, a pump 76 is arranged in the middle of the pipe line 74. As a result, the developer that overflows into the developer recovery tank 16 and is collected is returned to the developer tank 14.

Further, one end of a drain pipe 78 is opened at the bottom of the developer tank 14, and the other end is opened to a drain tank 80. A valve 82 is disposed in the middle of this drain pipe 78. By opening the valve 82, the developer in the developer tank 14 is discharged into the drain tank 80. Further, one end of a drain pipe 84 is opened at the bottom of the developer recovery tank 16, and the other end is opened to the drain tank 80. A valve 86 is disposed in the middle of this drain pipe 84. By opening the valve 86, the developer in the developer recovery tank 16 is discharged into the drain tank 80.

These circulation pump 58 and replenisher pump 6
6. The water supply pump 72 and the pump 76 are connected to a control section 88 provided in the photosensitive planographic printing plate processing apparatus 10, so that their driving is controlled.

A detector 90 connected to the control section 88 is arranged on the insertion side of the pair of transport rollers 22. This detector 90 detects the passage time of the PS plate 12 in the insertion slot of the photosensitive planographic printing plate processing device 10, and
The PS plate 12 is inserted into the photosensitive lithographic printing plate processing apparatus 10 by the control unit 88 with the plate processing speed and width dimension of the PS plate adjusted.
It is designed to calculate the area of .

Further, a concentration detector 92 is installed in the middle of the pipe line 56.
is arranged, and the degree of concentration of the developer is measured by detecting the impedance of the developer. This concentration detector 92 is also connected to the control section 88.

A heater 98 is arranged at the bottom of the developer tank 14 to heat the developer in the developer tank 14 to a predetermined temperature and keep it warm. Further, since this heater 98 is disposed over the entire area along the width direction of the PS plate 12, the developer in the developer tank 14 is uniformly heated at least in the width direction of the PS plate 12. This makes it possible to uniformly develop the PS plate while transporting it.

Further, the surface of the developer in the developer tank 14 is covered with a floating lid 100. This floating lid 100 prevents deterioration of the developer caused by the developer absorbing carbon dioxide gas in the air and neutralizing alkaline components in the developer. Since the lid 100 is molded from foamed nylon, it floats on the surface of the developer in the developer tank 14, and also reliably follows the rise and fall of the liquid level. This floating lid 100 may have a structure that is fixed in a fixed position.

As shown in FIG. 1, a pair of upper and lower conveying rollers 102 are arranged on the upper side walls of the developer recovery tank 16 and the washing tank 18 adjacent to each other. These pair of conveyor rollers 102 are supported by a pair of side plates (not shown), and are rotated by the driving force of a driving means (not shown) transmitted thereto. A recovery roller 104 disposed in a developer recovery tank 16 is in contact with the lower conveyance roller 102 . As a result, the developer carried out by the PS plate 12 and attached to the pair of transport rollers 102 is collected into the developer recovery tank 16.

[0043] Also, the upper conveyance roller 102 is provided with a water washing tank 1.
A metal roller 106 is placed in contact with the transport roller 1 on the 8 side.
The water adhering to 02 is squeezed and returned to the washing tank.

A pair of upper and lower transport rollers 108 are arranged in the washing tank 18 on the downstream side in the transport direction of the PS plate 12. These pair of conveyance rollers 108 are also the pair of conveyance rollers 1
Like 02, it is supported by a pair of side plates (not shown),
Like the pair of conveyor rollers 102, it is rotated by the driving force of a driving means (not shown).

Therefore, the P sent out from the developer tank 14
The S plate 12 is pinched and conveyed by a pair of conveyance rollers 102,
It is inserted between a pair of conveyance rollers 108 in the washing tank 18 and sent out to the desensitization treatment tank 20.

A guide roller 112 is arranged between the pair of transport rollers 102 and the pair of transport rollers 108, and a spray pipe 114 is arranged above it. The spray pipe 114 is formed as a hollow pipe, and has a plurality of discharge ports formed along the axial direction. Further, like the guide roller 32, the guide roller 112 includes a plurality of rollers that constitute an elastic rotating member attached to the outer periphery of the spray pipe. For this reason, spray pipe 11
4 also has the function of supplying washing water to the PS plate 12 and guiding the PS plate 12.

One end of a pipe line 110 is open at the bottom of the washing tank 18, and the other end communicates with a guide roller 112 that also serves as a spray pipe and a spray pipe 114. A circulation pump 116 is disposed in the middle of the pipe line 110, and supplies the washing water in the washing tank 18 to the guide roller 112 and the spray pipe 114 to wash the PS plate 12. Further, a collection roller 118 is disposed in contact with the lower conveyance roller 102 . Thereby, the washing water adhering to the pair of transport rollers 102 is collected into the washing tank 18.

Furthermore, a water supply tank 6 is provided above the washing tank 18.
One end of a conduit 120 that communicates with 8 is open, and a water supply pump 122 is disposed in the middle of this conduit 120. Therefore, the flush water in the water supply tank 68 is supplied into the flush tank 18 by the operation of the water supply pump 122.

[0049] Furthermore, a drainage pipe 124 is provided at the bottom of the washing tank 18.
One end is open, and the other end communicates with the drain tank 126. A valve 128 is located in the middle of this drain pipe 124.
is located. When the valve 128 is opened, the washing water in the washing tank 18 is discharged into the drain tank 126.

These circulation pumps 116 and water supply pumps 1
22 is connected to a control section 88 so that its operation can be controlled.

A pair of conveyance rollers 130 are disposed above the desensitization treatment tank 20, which is disposed on the downstream side of the washing bath 18 in the conveyance direction of the PS plate 12. The pair of conveyance rollers 130 are spanned between a pair of side plates (not shown) and are rotatably supported. A driving force from a driving means (not shown) is transmitted to the pair of conveying rollers 130 to rotate them. The PS plate 12 sent out from the pair of transport rollers 108 is inserted between the pair of transport rollers 130 .

A spray pipe 132 and a guide similar to the spray pipe 114 and guide roller 112 disposed in the washing tank 18 are installed between the pair of transport rollers 130 and the pair of transport rollers 108 at the upper part of the desensitizing treatment tank 20. roller 1
34 are arranged. These spray pipes 132
, the guide roller 134 is in communication with one end of the conduit 136. The other end of the pipe line 136 penetrates the bottom of the desensitizing tank 20 and projects into the desensitizing tank 20 to open. A circulation pump 138 is arranged in the middle of the pipe line 136, and the desensitization treatment liquid in the desensitization treatment tank 20 is supplied to the spray pipe 132 and the guide roller 134 by the operation of this circulation pump 138. It has become.

[0053] Also, above the desensitization treatment tank 20, there is a conduit 1.
One end of the pipe line 144 is open, and the other end of the pipe line 144 communicates with the inside of the desensitizing treatment liquid replenishment tank 146. Conduit 14
A replenisher pump 148 is disposed in the middle of the desensitizing treatment tank 2.
The desensitizing liquid from the desensitizing liquid replenishment tank 146 is supplied into the desensitizing liquid replenishing tank 146.

[0054] Also, above the desensitization treatment tank 20, there is a conduit 1.
One end of the pipe line 140 is open, and the other end of the pipe line 140 communicates with the inside of the water supply tank 68. A water supply pump 142 is disposed in the middle of the pipe line 140, and water is supplied to the desensitization treatment tank 20 by operating the water pump 142.

Further, one end of a drain pipe 150 is opened at the bottom of the desensitizing tank 20. The other end of this pipe line 150 communicates with a drain tank 152. Drainage tank 152
A valve 154 is placed in the middle. By opening this valve 154, the desensitizing treatment liquid in the desensitizing treatment tank 20 is discharged into the drain tank 152.

Circulation pump 138, replenisher pump 148,
The water supply pump 142 is connected to the control unit 88 so that its operation is controlled.

Next, the operation of this embodiment will be explained. The PS plate 12 on which an image has been printed by a printing device (not shown) is inserted into a pair of conveyance rollers 22 of the photosensitive planographic printing plate processing device 10 .

After the PS plate 12 is sent out from a pair of transport rollers 22, it is guided by a guide roller 42 and a guide roller 24 and sent into the developer tank 14. The PS plate 12 sent into the developing tank 14 is moved by guide rollers 26, 28,
30 and descends to the center of the developer tank 14.

PS plate 12 sent to the center of developer tank 14
is guided by a guide 52 and inserted between a pair of transport rollers 48 . The PS plate 12 sent out from this pair of transport rollers 48 is transferred to the guide rollers 32, 34, 36, 38, 4
0, 44, and 46, rises, and is sent out from the developer tank 14.

By this conveyance, the PS plate 12 is transferred to the developing tank 14.
The film is immersed in a developer solution and processed.

[0061] Since the upper surface of the developer is covered by the lid 100, deterioration due to exposure to air is prevented.

Further, the PS plate 12 is sprayed with a developer in the developer tank 14 by spray pipes 54 and 60, so that the PS plate 12 is reliably developed. Further, the developer discharged by the spray pipes 54 and 60 mixes with the developer in the developer tank 14, and the developer in the developer tank 14 is circulated by the circulation pump 58.
The liquid passes through the conduit 56 and is discharged from the spray pipes 54 and 60 again.

As shown in FIG. 3A, the spray pipes 54 and 60 eject the developer in alternate directions (staggered) in the axial direction of the spray pipes 54 and 60. Therefore, when the PS plate 12 is not being conveyed, the developer ejected from the circular holes 200 and 202 does not interfere with each other, and their ejection pressures do not cancel each other out.

The circulation of the developer is affected by the magnitude of this discharge pressure, but since the discharge pressures do not cancel each other out, the circulation efficiency is improved, and the developer is stirred and flows into the bottom liquid of the developer tank 14. This eliminates the accumulation of muddy precipitates such as residues of dissolved photosensitive layers and precipitates such as silicate from the developer. Therefore, a large amount of precipitate is not carried by the circulation pump 58 to the spray pipes 54, 60 together with the developer, and the precipitate does not adhere to the plate surface of the PS plate 12 and stain the plate surface.

Furthermore, as a result of improved stirring efficiency,
The temperature distribution of the developer in the developer tank is made uniform, the temperature control efficiency of the developer is improved, and unnecessary power consumption can be suppressed.

By the way, the precipitate floating in the developer is
When the developer is circulated, dirt is removed by passing through a filter 156. In this case, since the filter 156 is disposed upstream of the circulation pump 58, precipitates and residues in the developer do not directly enter the circulation pump 58. This makes it possible to prevent the circulation capacity of the circulation pump 58 from decreasing.

The filter 156 can also prevent precipitates and residues in the developer from adhering to or accumulating on spray pipes, detection sensors, etc. in the circulation path.

According to this embodiment, since the precipitates are not accumulated in the developing tank and can be efficiently removed, the cleaning work of the developing tank becomes easy and the frequency of cleaning can be reduced. Maintainability is also improved.

The PS plate 12 sent out from the developer tank 14 is inserted into a pair of transport rollers 102 of the developer recovery tank 16, and is nipped and transported. Due to this nipping, the developer adhering to the PS plate 12 is squeezed out by the pair of transport rollers 102 and drained. This squeezed developer is transmitted along the surface of the lower pair of conveyance rollers 102 and collected by the collection roller 104.
The developer is collected into the developer collection tank 16 by the following steps. The developer recovery tank 16 also collects the developer that overflows when the developer replenisher and water are replenished into the developer tank 14 by driving the replenisher pump 66 and the water supply pump 72. The developer collected in the developer recovery tank 16 in this way passes through the pipe 74 and is pumped into the developer tank 14 by the pump 76 as described above.
It is meant to be brought back inside.

[0070] The pair of conveyance rollers 102 are sent out.
The S plate 12 is guided by a guide roller 112 and is transported and inserted into a pair of transport rollers 108 .

During this conveyance, washing water is supplied to both sides of the PS plate 12 by a spray pipe that also serves as a guide roller 112 and a spray pipe 114. The developer, precipitates, foreign matter, etc. adhering to both surfaces of the PS plate 12 are washed away by this washing water.

[0072] The pair of transport rollers 108 are sent out.
The S plate 12 is guided by a guide roller 134 and inserted into a pair of transport rollers 130. A pair of conveyor rollers 1
Immediately before being inserted into the PS plate 30, a desensitizing treatment liquid is applied to both surfaces of the PS plate 12 by a spray pipe 132 and a spray pipe of a guide roller 134. By applying this desensitizing treatment liquid, the surface of the PS plate 12 is protected.

When a large number of PS plates are developed in a developer tank, the developer becomes exhausted. Since the fatigue concentration of this developer is approximately proportional to the area of the PS plate 12 to be processed, the width and length of the PS plate 12 inserted into the device are detected by the detector 90, and the area and replenishment are performed by the control unit 88. Calculate the amount. Based on this result, the controller 88 controls the replenisher pump 66 and the water supply pump 7.
2 is calculated, and the replenisher pump 66 is operated to supply an amount of developer replenisher (undiluted solution) from the developer replenishment tank 62 and water from the water supply tank 68 at a constant rate according to the degree of developer fatigue. Water supply pump 72 is activated. . On the other hand, the degree of concentration due to evaporation of water in the developer is determined by measuring the impedance value using the detector 92. Based on this detection result, the operating time of the water supply pump 72 is calculated and PS version 1
The replenisher pump 66 and the water supply pump 72 are operated to supply the developer replenisher in an amount corresponding to the area of 2.

On the other hand, the washing tank 18 is replenished with washing water by the water supply pump 122, and the desensitization treatment tank 20 is supplied with desensitization treatment liquid and the water supply pump 14 by the replenishment liquid pump 148.
2 allows water to be replenished at a constant rate.

After completing the series of operations described above, the developer in the pipe line 56, circulation pump 58, and pipe line 162 can be discharged by opening the valve 160. Further, by this discharge, components of the photosensitive material and other foreign substances eluted from the PS plate adhering to the filter 156 can be discharged at the same time.

In this embodiment, the circular holes 200 and 202 are arranged alternately in the axial direction for the spray pipes 54 and 60 in the developer tank 14, but the structures of the spray pipes in the other tanks are similarly arranged. Good too.

Furthermore, in this embodiment, the spray pipe 54
, 60 so as to alternate in the axial direction of the circular holes 200,
202, but as shown in Figure 4, PS version 12
The circular hole 202 of the spray pipe 54, which corresponds to the surface opposite to the photosensitive surface, may be directed downward, so that the direction in which the developer is ejected from the circular holes 200, 202 is the same. In this case, the circular holes 200 and 202 are connected to the spray pipe 54,
60 may be arranged alternately in the axial direction (Fig. 4 (
(see FIG. 4(B)).

Furthermore, as shown in FIG. 5, the flow rate of the developer flowing through both spray pipes 54 and 60 may be changed by constricting the inside of the base side of one of the spray pipes (for example, the spray pipe 54). good. That is, an orifice 204 with an inner diameter of L is provided inside the spray pipe 54.
A piece member 206 having a shape formed thereon is disposed. This results in
The circular hole 200 of the spray pipe 60 is smaller than the inner diameter dimension M of the other spray pipe 54 (M>L).
The discharge pressure of the developer jetted out from the tank increases. When the discharge pressure increases, the jetting direction changes along the flow direction in the spray pipe 60, and the circular hole 202 of the other spray pipe 54 changes.
It does not interfere with the direction in which the developer is ejected, and does not reduce circulation efficiency.

Furthermore, as shown in FIG. 6, one of the circular holes 2
A guide nozzle 208 may be attached to 00 to forcibly change the flow of the developer.

[0080]

[Effects of the Invention] As explained above, the photosensitive lithographic printing plate processing apparatus according to the present invention improves stirring efficiency, eliminates precipitates, improves temperature rise characteristics of processing liquid, and improves temperature control accuracy. The excellent effect of being able to do this can be obtained.

[Brief explanation of the drawing]

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

FIG. 2 is a piping diagram showing piping for a filter and a valve.

[Figure 3] (A) is a side view of the spray pipe in the developer tank, (B) is a sectional view taken along the line VB-VB in Figure 5 (A), (C)
is a cross-sectional view taken along the line VC-VC in FIG. 5(A).

FIGS. 4A and 4B are side views of the spray pipe when the jetting directions of the developer are made to match.

FIG. 5 is a side view of a spray pipe when an orifice is provided in one of the spray pipes.

FIG. 6 is a side view of a spray pipe in which a guide nozzle is provided on one of the spray pipes.

[Explanation of symbols]

10 Photosensitive planographic printing plate processing device 12 Photosensitive planographic printing plate (PS plate) 14 Developer tank 16 Developer recovery tank 54 Spray pipe 58 Circulation pump 60 Spray pipe 200 Circular hole (spout nozzle) 202 Circular hole (spout nozzle)

Claims (3)

[Claims] [Claim 1] A pair of jet nozzles are provided across the transport path of the photosensitive lithographic printing plate in a processing tank for processing the photosensitive lithographic printing plate on which an image has been printed, and a plurality of jetting nozzles are provided for spouting a processing liquid. 1. A photosensitive lithographic printing plate processing apparatus having a spray pipe, characterized in that the jetting directions of the processing liquid jetted from the jetting nozzles of the respective spray pipes do not intersect with each other. 2. The photosensitive planographic printing plate processing apparatus according to claim 1, wherein the ejection nozzles of each of the spray pipes are arranged alternately along the axial direction of the spray pipe. 3. The photosensitive planographic printing plate processing apparatus according to claim 1, wherein the ejection direction of the ejection nozzle is substantially parallel and directed toward the bottom of the processing tank.