JPH0738918Y2 - Structure of replenisher supply unit of photosensitive lithographic printing plate processor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a replenisher solution supply structure for supplying a replenisher solution to a photosensitive lithographic printing plate processor for developing a photosensitive lithographic printing plate in a processing tank. .

[Prior Art] A photosensitive lithographic printing plate having an image printed thereon is developed in a developing tank, washed with a washing tank, and then desensitized in a desensitizing tank.

The processing liquid filled in such a processing tank is agitated by being circulated by a circulation pump to be uniformly maintained, and when deterioration of the processing liquid is detected, the processing liquid or replenishing liquid with water is replenished. It is designed to be supplied to the processing tank by a liquid pump. The outlet of the replenisher supplied to the processing tank by this replenisher pump to the processing tank is located above the surface of the processing tank in order to prevent the processing solution in the processing tank from flowing backward from this outlet. The replenisher is arranged apart from the surface of the processing liquid, and the replenisher is supplied from above the surface of the processing liquid in the processing tank.

[Problems to be solved by the device]

However, due to the difference in specific gravity between the supplied replenisher and the processing solution in the processing tank, the supplied replenisher and the processing solution are not sufficiently mixed, that is, the specific gravity of the replenisher is smaller than that of the processing solution. There is a problem that the upper layer replenishing solution and the lower layer processing solution are separated into two layers and the processing solution cannot be sufficiently mixed by stirring the processing solution by operating the circulation pump.

In consideration of the above facts, the present invention prevents the processing liquid in the processing tank from flowing backward from the outlet of the replenishing liquid and mixing into the replenishing liquid pump or the replenishing liquid tank, and the processing liquid in the processing tank It is an object of the present invention to obtain a structure of a replenisher supply unit of a photosensitive lithographic printing plate processing machine which can surely and sufficiently mix the supplied replenisher.

[Means for Solving the Problems]

The present invention is a replenishment of a photosensitive lithographic printing plate processing machine for supplying a replenishing solution of a processing liquid to a photosensitive lithographic printing plate processing machine for processing a photosensitive lithographic printing plate having an image printed thereon with a processing solution in a processing tank. A liquid supply unit structure, a replenisher pump for supplying a replenisher, a sub-tank for arranging the replenisher supplied by the replenisher pump so that the head of the replenisher is larger than that of the treatment liquid in the treatment tank, and the replenishment from the sub-tank. Liquid introducing means for guiding the liquid to the suction side of a circulation pump for circulating and stirring the liquid in the processing tank.

[Operation] According to the present invention, the processing solution filled in the processing tank of the photosensitive lithographic printing plate processor is agitated by being circulated by a circulation pump, and the concentration of the processing solution and the processing ability of the photosensitive lithographic printing plate are improved. When the deterioration of the processing liquid is detected, the replenishing liquid by the processing liquid or water is supplied to the sub tank by the replenishing liquid pump, and then circulates by the head of the replenishing liquid itself and the negative pressure of the circulation pump. It is guided to the suction side of the pump, and is directly agitated and mixed with the processing liquid by the circulation pump and the liquid guiding section up to the spray pipe and the spray pipe.

[Advantage of the Invention] As described above, according to the present invention, the processing liquid in the processing tank is prevented from flowing backward from the outlet of the replenishing liquid and mixing into the replenishing liquid pump or the replenishing liquid tank, and the treatment of the processing tank is prevented. It has an excellent effect that the liquid and the replenisher supplied to the processing tank can be surely and sufficiently mixed.

[Embodiment of the Invention] FIG. 1 shows a photosensitive lithographic printing plate processor to which the present invention is applied.
Ten examples are shown.

The photosensitive lithographic printing plate processor 10 includes a developing tank 14 for developing a photosensitive lithographic printing plate (hereinafter referred to as PS plate) 12 on which an image is printed by a printing device (not shown), and the developing tank 14
Developer recovery tank 16 for recovering the developer overflowed from the tank, and a washing tank for washing the developer adhering to the PS plate 12 with water
18 and a desensitizing treatment tank 20 for coating the PS liquid 12 with the finnish solution.

As shown in FIG. 1, a pair of transport rollers 22 are arranged on the side of the PS plate 12 to be inserted into the developing tank 14. The PS roller 12 is transferred from the printing device (not shown) to the developing tank 14 by the transport roller 22.
It is designed to be transported inside.

The developing tank 14 has a substantially inverted mountain shape in which the upper part is opened and the central part of the bottom part is projected downward. A developing solution 24 is contained in the developing tank 14. In the developing tank 14, guide rollers 26, 28, 30, 32, 34, 36, 38 are provided along the bottom wall.
Are arranged. These guide rollers 26 to 38 are hung between a pair of side plates (not shown) and rotatably supported. Further, a skewer roller 40 having a guide function and a liquid discharging function is arranged between the guide rollers 34 and 36. As shown in FIG. 2, in this skewered roller 40, a guide roller 41C is rotatable around the outer periphery of a spray pipe 41B in which a plurality of discharge ports 41A are provided at predetermined intervals along the axial direction. It is supported and configured. Therefore, the skewered roller 40 discharges the developing solution from the discharge port 41A, and the guide roller 41C guides the PS plate 12. A guide roller 42 is arranged above the guide roller 26 near the transport roller 22. Further, a guide roller 44 is provided above the guide roller 28 and the guide roller 30, a guide roller 46 is provided above the guide roller 32 and the guide roller 34, and a skewer roller 40 and a guide roller 36.
A guide roller 48 is provided above the
Guide rollers 50 are arranged above the 38, respectively,
Like the guide rollers 26 to 38, it is supported by a pair of side plates (not shown).

A guide roller 34 and a skew roller 40 are provided in the center of the developing tank 14.
And a pair of conveyance rollers 52 are arranged between them. The carrying roller 52 is supported by the side plate like the guide rollers 26 to 38, and is rotated by transmitting the driving force of the driving means (not shown).

Therefore, the PS plate 12 nipped and conveyed by the conveyance roller 22 and inserted into the developing tank 14 is guided between the guide roller 44 and the guide rollers 28 and 30 by passing between the guide roller 42 and the guide roller 26. , Is obliquely lowered through the space between the guide roller 46 and the guide rollers 32, 34, and is inserted between the conveyance rollers 52,
After passing the conveyance roller 52, the skewer roller 40 and the guide roller 4
Guided by 8, 36 and 38, it rises diagonally and guide roller 5
It is guided to 0 and is sent out above the developer recovery tank 16. In this way, the PS plate 12 is immersed in the developing solution 24 in the developing tank 14 and developed.

A bending portion that is bent toward the outside of the developing tank 14 is formed on the side wall on the downstream side of the developing tank 14 in the conveying direction of the PS plate 12, and the vertical height of this bending portion is the conveying direction of the PS plate 12. It is lower than the upstream side wall. Therefore, the developer in the developing tank 14
Whenever 24 overflows, the developer recovery tank 16
It is supposed to be collected.

One end of a pipeline 54 communicates with the bottom of the developing tank 14. A circulation pump 56 is arranged in the middle of the pipe 54, and the other end communicates with the skewer roller 40 and the spray pipe 58 arranged in the developer 24 in the developing tank 14. As a result, the developer 24 in the developing tank 14 is circulated while being sprayed, so that more effective stirring is performed.

Further, one end of the pipeline 60 is opened at the bottom of the developer recovery tank 16, and the other end is opened above the developer tank 14 via a pump 62 in the middle. As a result, the developer collected by overflowing into the developer collecting tank 16 is returned into the developing tank 14.

Further, a drainage line is provided at the bottom of the developing tank 14 and the developer collecting tank 16.
55 and 61 are opened and communicate with the drainage tank 57, and valves 55A and 61A are arranged in the middle of the drainage pipes 55 and 61.

Further, a developing solution (stock solution) and a replenishing solution of water are supplied to the developing tank 14, and this supplying section will be described in detail with reference to FIG.

A developer (stock solution) replenisher tank 64 arranged below the developing tank 14 stores a developer (stock solution) replenisher solution, and a water supply tank 65 stores replenisher water. In this developer (stock solution) replenisher and replenisher water, a pipe made of hard vinyl chloride is used.
One end of 66, 67 is immersed. The pipelines 66, 67 are replenisher pumps 68 made of bellows pumps having check valves in the middle,
69 is interposed and extends above the developing tank 14, and the tip (the other end) is bent toward the surface of the developer 24 in the developing tank 14 to form bent portions 66A and 67A. In the developing tank 14, a sub tank 200 having an opening 200A opened toward the bent portion 67A is supported via a bracket 202. The opening 200A of the sub tank 200 is the developer 2 in the developing tank 14.
It is located above the liquid level of No. 4. Further, one end of a conduit 203 made of hard vinyl chloride is connected to the bottom opening 200B of the sub tank 200. The conduit 203 extends along the bottom wall of the developing tank 14, and the tip thereof is guided to the vicinity of the suction portion 54A of the conduit 54 by the circulation pump 56.

Therefore, when the replenisher pump 69 is stopped, the sub tank 200 is opened by the opening portion 200A, so that the developer 24 in the developing tank 14 flows into the sub tank 200 and the liquid level in the sub tank 200 becomes the liquid in the developing tank 14. It is the same as the surface. on the other hand,
When the replenisher pump 69 is operated, the replenisher water in the water supply tank 65 is supplied into the sub tank 200 via the pipe 67.
By supplying this replenishing water, the liquid level in the sub tank 200 becomes higher than the liquid level in the developing tank 14, that is, the head of the liquid in the sub tank 200 becomes larger than the head of the developing solution 24 in the developing tank 14, and Therefore, the replenishment water in the sub tank 200 is supplied to the suction portion 54A of the pipe 54 through the pipe 203. When the circulation pump 56 is further operated, the liquid in the sub-tank 200 is sucked into the pipeline 54 together with the developer 24 in the developing tank 14 and ejected into the developing tank 14 via the spray pipe 58 and the skew roller 40. It has become so.

In this embodiment, the sub tank 200 is the developing tank 14
Since it is located inside the sub tank 20
Even if it overflows from the opening 200A of 0, there is no possibility that it will flow out from the developing tank 14.

Further, in this embodiment, the replenishing water of the water supply tank 65 is the sub tank.
200 is supplied to the pipe 54 through the pipe 203, and the developer (stock solution) replenisher is supplied to the liquid surface of the developer 24 in the developing tank 14. This is because the specific gravity is smaller than that of the stock solution / replenisher, and in some cases the developer (stock solution) replenisher may be supplied to the sub-tank 200. Also, two sub-tanks are used to supply the replenisher water and the developer (stock solution) replenisher. It is also possible to do so. In this way, the replenisher and the developer in the developer tank 14 are surely mixed.

The driving of the replenisher pumps 68 and 69 is controlled so that the developer (stock solution) replenisher and the replenisher are constant. That is, the pump 62, the replenishing liquid pumps 68 and 69, and the circulation pump 56 are connected to the control unit 70 provided in the photosensitive lithographic printing plate processing machine 10 to control the driving.

Further, a detector 72 is arranged on the insertion side of the transport roller 22 so as to detect the insertion state of the PS plate 12 into the photosensitive lithographic printing plate automatic processing apparatus 10 and also detect the area of the PS plate 12. ing. The detector 72 is connected to the control unit 70.

Further, a fatigue detector 74 is arranged in the middle of the pipeline 54, and the fatigue of the developer is measured by detecting the electric conductivity of the developer. This fatigue detector
74 is also connected to the control unit 70.

As shown in the position, a pair of upper and lower transport rollers 76 are arranged above the side walls of the developer recovery tank 16 and the water washing tank 18 which are adjacent to each other. These transport rollers 76 are supported by a pair of side plates (not shown), and are rotated by transmitting the driving force of a driving means (not shown). Lower transport roller 76
A recovery roller 78 disposed in the developer recovery tank 16 is in contact with the. As a result, the developer 24 carried out by the PS plate 12 and attached to the transport roller 76 is collected in the developer collecting tank 16.

In the water washing tank 18, a pair of upper and lower transport rollers 82 are arranged on the downstream side in the transport direction of the PS plate 12. Like the transport roller 76, these transport rollers 82 are also supported by a pair of side plates (not shown), and are driven in the same manner as them.

Therefore, the PS plate 12 sent out from the developing tank 14 is nipped and carried by the carrying roller 76, inserted into the carrying roller 82, and sent to the desensitizing processing tank 20.

One end of a pipe line 88 is opened at the bottom of the water washing tank 18, and the other end is in communication with skewer rollers 84 and 86 arranged between the transport roller 76 and the transport roller 82. Further, a pump 90 is arranged in the middle of the pipe line 88 so that the washing water in the washing tank 18 is supplied to the skewer rollers 84 and 86 to wash the PS plate 12. These skewer rollers 84 and 86 are the skewer rollers 40 described above.
It has the same configuration and function as. A collecting roller 80 is in contact with the lower transport roller 76. As a result, the washing water attached to the lower conveying roller 76 is collected in the washing tank 18.

Further, a pipe 89 communicating with the water supply tank 65 is opened at the bottom of the washing tank 18, and a water supply pump 91 is arranged in the middle of the pipe 89.

Further, a drainage pipe 89A is opened at the bottom of the washing tank 18 and communicates with a drainage tank 89B. This drain line 89A
A valve 89C is arranged in the middle of the.

In the desensitizing tank 20, a pair of upper and lower conveying rollers 92 are suspended and supported between a pair of side plates (not shown). A driving force of a driving means (not shown) is transmitted to the conveying roller 92 and is rotated.

Further, on these side plates, between the transport rollers 92 and 82, a finisher liquid discharge pipe 98 is supported above the transport path of the PS plate 12, and below the transport path the lower surface of the PS plate 12 is supported. The skewer rollers 99 for discharging the finisher liquid, which are guided to the conveying rollers 92, are respectively provided. The finisher liquid discharge pipe 98 is provided with a plurality of discharge ports along the axial direction, and the finisher liquid supplied to the finisher liquid discharge pipe 98 is discharged.
The finisher liquid discharge pipe 98 has the same structure as the spray pipe 41B of FIG. 2 except that the guide roller 41C is not provided. The skewer roller 99 for discharging the finisher liquid is as shown in FIG. A circulation pump 1 is provided to the finisher liquid discharge pipe 98 and the finisher liquid discharge skewer roller 99 through a pipe line 102.
34 is connected, and the circulation liquid is supplied by the circulation pump 134 to the finisher liquid discharge pipe 98 and the finisher liquid discharge skewer roller 99.

Further, a pipeline 103 for supplementing and supplying the finisher liquid is also opened in the desensitizing treatment tank 20, and the pipeline 103 is also connected to the finisher replenishing pump 135A and the supplementary tank 135.

Next, the operation of this embodiment will be described.

PS that is nipped and conveyed by the conveyance rollers 22 into the developing tank 14.
The plate 12 is guided by the guide rollers 42 and 26 and fed.
The PS plate 12 fed into the developing tank 14 has guide rollers 44, 2
It is guided by 8, 30, 46, 32 and 34 and descends to be fed to the central portion of the developing tank 14 and inserted into the conveying roller 52. Conveyor roller
The PS plate 12 nipped and conveyed by the 52 is guided by the skewer roller 40 and the guide rollers 48, 36, 38, and 50 to move up to the developing tank 14
Sent out from within.

In this way, the PS plate 12 is immersed in the developing solution 24 in the developing tank 14 for development processing.

The developing solution 24 in the developing tank 14 is circulated to the developing tank 14 by a circulation pump 56 via a pipe 54.

The PS plate 12 sent out from inside the developing tank 14 is inserted into the carrying roller 76, and is nipped and carried. By this sandwiching, the developer 24 attached to the PS plate 12 is squeezed out by the transport roller 76 and is drained. The squeezed developer 24 travels along the surface of the lower transport roller 76 and is collected by the collecting roller 78 into the developer collecting tank 16. The developer 24 thus collected in the developer collecting tank 16 is pumped through the conduit 60 as described above.
By 62, it is returned to the inside of the developing tank 14.

The PS plate 12 transported into the washing tank 18 by the transport rollers 76 is guided by the skewer rollers 84 and 86, inserted into the transport rollers 82, and sandwiched. At this time, the wash water from the skewer rollers 84, 86
Since it is supplied onto the PS plate 12, the developer 24 attached to the surface of the PS plate 12 is removed. Rinsing water after washing with water
Recovered into 18 The washing water in the washing tank 18 is supplied to the skewered rollers 84, 86 by a pump 90 via a pipe line 88.

The PS plate 12 sent out from the carrying roller 82 is guided by the skewer roller 99 for discharging the finisher liquid and is inserted between the carrying rollers 92. During this transportation, the finisher liquid discharged from the finisher liquid discharge pipe 98 and the finisher liquid discharge skewer roller 99 is applied to the surface of the PS plate 12.
Excess finnish solution is collected in the desensitizing tank 20.

The PS plate 12 sent from the carrying roller 92 is sent to a drying device (not shown).

In this way, the PS plate 12 is developed in the developing tank 14 and washed with water 18.
The washing liquid is applied and the desensitizing tank 20 is applied with the finisher liquid.

Further, the fatigue caused by the processing of the developer 24 varies depending on the area of the image area and the area of the non-image area of the PS plate 12 (if the area of the image area is large, the fatigue of the developer is large). The electric conductivity of the developer 24 is detected by. Based on this result, the operating time of the replenisher pumps 68 and 69 is calculated by the control unit 70, and the replenisher and the replenisher of the replenisher and the replenisher of the replenisher amount corresponding to the degree of fatigue of the developer are supplied to the replenisher tank 64 and the water supply tank. Replenisher pumps 68, 69 are activated to supply from 65. The replenishing liquid pumps 68 and 69 supply the replenishing liquid (development liquid) to the surface of the developing liquid 24 in the developing tank 14 and the replenishing water to the sub tank 200. The head of the surface of the sub tank 200 whose liquid level has been raised and the operation of the circulation pump 56 guide the replenisher liquid in the sub tank 200 to the pipe 54 via the pipe 203 and the spray pipe 58 and the skewer roller 40. Therefore, it is sprinkled in the developer 24 so as to be surely mixed with the developer.

However, since the PS plate melt deposits, deposits of developer components, etc. adhere to the fatigue detector 74, an abnormality may occur in the detected value of electrical conductivity by the fatigue detector 74,
If the difference between the insertion area of the PS plate 12 detected by the detection sensor 72 and the value of the fatigue level of the developer due to electrical conductivity shows an abnormal value, an alarm is generated, or as described below. , The PS plate 12 can be automatically or manually switched to a replenishment method based on the insertion area.

That is, the detection sensor 72 detects the area of the PS plate 12 to be inserted, and the control unit 70 calculates the operation time of the replenisher pumps 68 and 69 based on the detection result, and replenishes in accordance with the area of the PS plate 12. Replenisher pumps 68, 69 to supply the required amount
Is activated and performed.

FIG. 4 shows the replenisher supply unit according to the second embodiment. In this embodiment, the same members and parts as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, and their detailed description will be omitted.

In this embodiment, the pipe 203 is provided outside the developing tank 14. That is, one end of the conduit 203 is opened in the bottom wall of the developing tank 14 and faces the bottom opening 200B formed in the bottom of the sub tank 200 so that the replenisher can flow in. Again pipeline
The other end of 203 is connected to one opening of a branch pipe 53 that connects the bottom opening 14A of the developing tank 14 and the suction side of the circulation pump 56 of the pipe 54.

Therefore, also in this embodiment, as in the first embodiment, the replenisher supplied to the sub-tank 200 by the replenisher pumps 68, 69 is circulated by the circulation pump 56 via the conduits 203, 54.
The spray pipe 58 sprays water into the developer in the developer tank 14 and mixes it with the developer.

FIG. 5 shows the replenisher supply unit according to the third embodiment. Also in this embodiment, the same members and parts as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, and detailed description thereof will be omitted.

In this embodiment, the sub tank 200 is arranged outside the developing tank 14. At the bottom opening 200B of the sub tank 200, the developing tank 14
One end of a pipe line 203 arranged outside is connected.
The other end of the pipe line 203 is connected to a nozzle 14B provided at a connecting portion between the developing tank 14 and the pipe line 54.

Therefore, also in this embodiment, as in the first and second embodiments, the replenisher supplied to the sub-tank 200 by the replenisher pumps 68 and 69 is circulated by the circulation pump 56 via the pipe 54 and the skew roller 40.
(Not shown) and the spray pipe 58 sprays water into the developer and mixes it with the developer.

In this case, the pipe 204 may be provided to prevent the liquid from flowing out of the sub tank 200 due to overflow.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a photosensitive lithographic printing plate processor to which the present invention is applied, FIG. 2 is a perspective view of a skewer roller, and FIG. 3 is an explanatory diagram showing a structure of a replenisher supply section. FIG. 4 is an explanatory view showing the function of the replenisher supply unit of the second embodiment, and FIG. 5 is an explanatory view showing the structure of the replenisher supply unit of the third embodiment. 10 …… Photosensitive lithographic printing plate processor, 14 …… Developing tank, 64 ……
Developer (stock solution) replenisher tank, 65 …… Water tank, 200
…… Sub tank, 203 …… Pipeline.

Claims (1)

[Scope of utility model registration request] 1. A photosensitive lithographic printing plate processing machine for supplying a replenishing solution of a processing solution to a photosensitive lithographic printing plate processing machine which processes a photosensitive lithographic printing plate having an image printed thereon with a processing solution in a processing tank. A replenisher supply structure, comprising a replenisher pump for supplying replenisher, a sub tank for arranging the replenisher supplied by the replenisher pump so that the head of the replenisher is larger than that of the treatment solution in the treatment tank, and the sub tank A replenisher supply unit structure for a photosensitive lithographic printing plate processor, comprising: a liquid guide means for guiding the replenisher to the suction side of a circulation pump that circulates and agitates the replenisher in the processing tank.