JPH08314128A - Automatic developing machine for photosensitive planographic printing plate - Google Patents

Abstract

PURPOSE: To make it possible rapidly and easily execute the processing of precipitate by automatically discharging a developer from a developing section before the generation of the precipitate in the developer and replenishing the developer with the fresh developer from a replenishing liquid replenishing section. CONSTITUTION: This developing machine has the replenishing liquid replenishing section A to a developing section 4 housing the developer, a developer discharging means B for automatically transporting the photosensitive planographic printing plates subjected to image exposure, continuously processing the photosensitive planographic printing plates and automatically discharging the developer from the developing section 4 before the generation of the precipitate in the developer and a developer supplying means C for supplying the fresh developer from the replenishing liquid replenishing section A. The machine described above detects the precipitation state of the precipitate of the components eluted from the photosensitive planographic printing plates, such as PS plates, of the developer and discharges the precipitate according the result of the detection. Whether the precipitate is generated or not when the developer processes the photosensitive planographic printing plates in about what quantity is previously investigated. This quantity at which the planographic printing plates are treated is detected and the planographic printing plates are automatically discharged according to the result of the detection.

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 automatic developing machine for automatically developing a photosensitive lithographic printing plate.

[0002]

2. Description of the Related Art A photosensitive lithographic printing plate automatic developing machine includes, for example, a developing unit for developing a photosensitive lithographic printing plate, a washing unit for washing with water or a washing solution, and a finishing unit for rinsing or gumming. Is provided, and the photosensitive lithographic printing plate is automatically developed while being conveyed to each processing section.

[0003]

The development of the photosensitive lithographic printing plate is to dissolve the exposed portion or the unexposed portion, and the developing solution in the developing portion is used for the development of the photosensitive lithographic printing plate. A large amount of dissolved resin accumulates. Further, the developing solution is a highly alkaline solution of silicate, and the silicate is difficult to be redissolved when deposited.

Further, the base material of the photosensitive lithographic printing plate is generally an aluminum plate, and aluminum is eluted in the developing solution. For this reason, precipitates intricately related to resin components, silicates, aluminum ions, calcium and magnesium components from dissolved water, and the like accumulate in the developer.

As a measure against this deposit, the user calls the periodic maintenance to update the developer and remove the deposit accumulated on the bottom of the developing section every 1 to 4 months or 5000 times.
Every 20000 sheets are carried out with a normal size photosensitive lithographic printing plate automatic developing machine.

For this reason, the photosensitive lithographic printing plate, the developing solution, and the like have been studied for the purpose of preventing precipitation.
Due to the basic composition, precipitation-free development cannot be realized, and there is only the effect of prolonging the replacement frequency of the developer.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a photosensitive lithographic printing plate automatic developing machine capable of rapidly and easily performing a precipitation treatment by dissolving an exposed portion or an unexposed portion. Has an aim.

[0008]

In order to solve the above-mentioned problems and to achieve the object, the invention according to claim 1 is provided with a replenisher replenishing section for a developing section containing a developing solution, and image exposure is carried out. In a photosensitive lithographic printing plate automatic developing machine that automatically conveys the photosensitive lithographic printing plate and continuously processes the photosensitive lithographic printing plate, the development from the developing unit is performed before a precipitate is generated in the developer. It is characterized in that it is provided with a developing solution discharging means for automatically discharging the solution and a developing solution supplying means for supplying a new developing solution from the replenishing solution replenishing section.

According to a second aspect of the present invention, the developing solution supplying means comprises a diluting water supplying means for supplying diluting water and a concentrated developing solution supplying means for supplying a concentrated developing solution.

According to a third aspect of the present invention, a replenisher replenishing section for a developing section containing a developing solution is provided, the photosensitive lithographic printing plate subjected to image exposure is automatically conveyed, and the photosensitive lithographic printing is continuously performed. In a photosensitive lithographic printing plate automatic developing machine for processing a plate, a developer discharging means for automatically discharging the developing solution from the developing section before a precipitate is generated in the developing solution, and replenishment of the replenishing solution replenishing section. It is characterized in that it is provided with an additive supply means for supplying an additive for adjusting a new developing solution by adding it to the liquid.

According to a fourth aspect of the present invention, the developing section is provided with cleaning solution supply means for supplying water or cleaning solution or cleaning drainage of a cleaning section following the developing section, and after the developing solution is discharged, a new developing solution is supplied. It is characterized in that it is configured such that water, a cleaning liquid, or cleaning drainage is previously supplied to the developing section to clean the developing section.

According to a fifth aspect of the present invention, a liquid circulating means is provided in the developing section, and after supplying the water or the cleaning liquid or the cleaning drainage to the developing section, the liquid circulating means is operated for a certain period of time so that the water or the cleaning solution is discharged. Alternatively, it is characterized in that after the cleaning waste water is discharged, a concentrated developer or a concentrated replenisher and a concentrated additive for adjusting the developer are added.

According to a sixth aspect of the present invention, a liquid level detecting sensor is provided in the developing section, and the completion of the filling of a new developing solution supplied after the developing solution is discharged is detected. .

According to a seventh aspect of the present invention, the photosensitive lithographic printing plate is conveyed in the air in the developing section, and a liquid circulating means for circulating the developing solution in the developing section and supplying it to the photosensitive lithographic printing plate is provided. It is characterized in that the amount of the retained liquid at the time of the liquid filling is increased by supplying the replenisher by the treatment of the photosensitive lithographic printing plate after the liquid is filled with the developing liquid.

According to a seventh aspect of the present invention, as a means for increasing the amount of the retained liquid at the time of the liquid filling, an outlet for overflowing the developing liquid is provided above the liquid surface for filling the new developing liquid or the liquid is drained. It is characterized in that the means is not operated until the amount of the retained liquid increases to a certain amount.

According to a ninth aspect of the present invention, a replenishing solution replenishing section for a developing section containing a developing solution is provided, the photosensitive lithographic printing plate subjected to image exposure is automatically conveyed, and the photosensitive lithographic printing is continuously performed. In a photosensitive lithographic printing plate automatic developing machine for processing a plate, a new liquid renewing means for the developing solution is provided, and the processing amount and / or the elapsed time of the photosensitive lithographic printing plate after the developing solution is renewed is detected and specified. When the processing amount and / or the prescribed time is reached, the developer is configured to be renewed with a new developer at any of the following timings.

In the operation stopped state, the liquid renewal control is immediately executed.

In the operation stopped state, the liquid renewal control is carried out at the start of operation or temperature control.

In the running state, the liquid renewal control is carried out by stopping the operation or controlling the low temperature protection temperature.

In the in-operation state, the liquid renewal control is executed at the next operation or the start of temperature control.

In the in-operation state, the developing section liquid is discharged and washed when the operation is stopped, and the update control is performed to supply a new developing solution at the next operation or temperature control start.

According to a tenth aspect of the invention, the liquid circulating means is provided in the developing section, and the liquid circulating means is driven for a certain period of time after the new liquid of the developing solution is renewed.

The invention according to claim 11 is provided with a replenisher replenishing section for a developing section containing a developing solution, which automatically conveys an image-exposed photosensitive lithographic printing plate, and continuously performs photosensitive lithographic printing. In a photosensitive lithographic printing plate automatic processor that processes the plate,
A liquid circulating means for circulating the developer in the developing section to supply it to the photosensitive lithographic printing plate, and a solution heating temperature adjusting means for heating the developer to adjust the temperature, and a new solution of the developer. A renewal means and a new solution renewal switch are provided, and by the operation of the renewal switch, the temperature of the developer is automatically adjusted after the new solution is renewed, and the photosensitive lithographic printing plate is warmed up for processing. It is characterized by having done.

According to a twelfth aspect of the present invention, a replenishing solution replenishing section for a developing section containing a developing solution is provided, and the imagewise exposed photosensitive lithographic printing plate is automatically conveyed to continuously perform photosensitive lithographic printing. In a photosensitive lithographic printing plate automatic processor that processes the plate,
A developing solution discharging means for automatically discharging the developing solution from the developing section before a precipitate is generated in the developing solution, and a cleaning solution for supplying water to the developing section or a cleaning solution or cleaning drainage of a cleaning section following the developing section. A supply unit and a cleaning switch for cleaning the developing unit are provided, and by operating this cleaning switch, at least one of water, cleaning liquid, and cleaning drainage is supplied to the developing unit after the developing solution is discharged. It is characterized in that it is configured to be washed.

According to a thirteenth aspect of the present invention, a replenisher replenishing section for a developing section containing a developing solution is provided, and the imagewise exposed photosensitive lithographic printing plate is automatically conveyed to continuously perform photosensitive lithographic printing. In a photosensitive lithographic printing plate automatic processor that processes the plate,
As a developing solution discharging means for automatically discharging the developing solution from the developing section before a precipitate is generated in the developing solution, a discharging pipe is directly or indirectly connected to the bottom of the developing section, and the discharging pipe is in the middle. Install a pump, solenoid valve, or motorized valve in
It is characterized in that at least one portion of the discharge pipe is bent upward and downward to form a pipe so that at least a part of the discharged liquid remains in the middle of the discharge pipe.

According to a fourteenth aspect of the present invention, the developing section is provided with a cleaning solution supply means for supplying water or cleaning solution or cleaning drainage of a cleaning section following the developing section.

According to a fifteenth aspect of the invention, a replenisher replenishing section for a developing section containing a developing solution is provided, the photosensitive lithographic printing plate subjected to image exposure is automatically conveyed, and the photosensitive lithographic printing is continuously performed. In a photosensitive lithographic printing plate automatic processor that processes the plate,
A developing solution discharging means for automatically discharging the developing solution from the developing section before a precipitate is generated in the developing solution is provided, and as the developing solution discharging means, a discharge pipe is directly or indirectly provided at the bottom of the developing section. , A solenoid valve or a motor-operated valve is installed in the middle of the discharge pipe, and the discharge port of this discharge pipe is guided to the inside of the waste liquid tank installed below the developing unit, and the discharge port from the bottom of the developing unit to the discharge port is connected. There is no liquid pool in the middle of the discharge pipe from the top to the bottom of the discharge pipe,
It is characterized in that the waste liquid tank is configured to be pseudo-sealed.

According to a sixteenth aspect of the present invention, a replenisher replenishing section for a developing section containing a developing solution is provided, the photosensitive lithographic printing plate subjected to image exposure is automatically conveyed, and the photosensitive lithographic printing is continuously performed. In a photosensitive lithographic printing plate automatic processor that processes the plate,
The amount of the developing solution with respect to the area obtained by multiplying the width of the processable photosensitive lithographic printing plate and the length of the transport path of the developing section is 3 mL / cm ² or less, and the difference in the type of the photosensitive lithographic printing plate It is characterized in that it is provided with a deterioration detecting means for detecting a difference in deterioration of the developing solution due to.

According to a seventeenth aspect of the present invention, the photosensitive lithographic printing plate is formed in a slit shape with respect to the conveyance path of the developing section so that the developing solution is retained in an amount of 3 mL / cm ² or less. It is characterized in that it is a developing unit having a dipping structure.

According to the eighteenth aspect of the invention, in order to keep the amount of the developing solution held at 3 mL / cm ² or less, the developing section conveys the photosensitive lithographic printing plate in the air and circulates the developing solution to circulate the developing solution. Equipped with liquid circulation means for supplying to the photosensitive lithographic printing plate,
It is characterized in that the amount of the developing solution held is an amount necessary for stable circulation of the developing solution.

According to a nineteenth aspect of the present invention, the deterioration detecting means for detecting the difference in the deterioration of the developing solution due to the difference in the type of the photosensitive lithographic printing plate, the conductivity of the developing solution, the resistance value, the impedance, and the pH value. At least one of them is used, and the amount of replenisher replenished per area of the photosensitive lithographic printing plate is corrected according to the detection result.

According to a twentieth aspect of the invention, in the developing section,
It is characterized in that a developing solution heating means and a solution temperature detecting means are provided and the temperature of the developing solution is controlled and controlled in the range of 33 ° C to 45 ° C.

According to a twenty-first aspect of the present invention, at least the upper space of the developing section is covered and is pseudo-sealed.

According to a twenty-second aspect of the invention, the air brought into contact with the developing solution is blown into the upper pseudo-closed space of the developing section.

According to the twenty-third aspect of the present invention, a replenisher replenishing section for a developing section containing a developing solution is provided, and the imagewise exposed photosensitive lithographic printing plate is automatically conveyed to continuously perform photosensitive lithographic printing. In a photosensitive lithographic printing plate automatic processor that processes the plate,
Deterioration detecting means for detecting a difference in deterioration of the developing solution due to a difference in the type of the photosensitive lithographic printing plate is provided, and the deterioration warning means such as displaying or alarming the deterioration of the developing solution is used to warn the replacement time of the developing solution. Is characterized by.

According to a twenty-fourth aspect of the present invention, the processing amount and / or elapsed time of the photosensitive lithographic printing plate after renewing the developing solution is detected, and when the prescribed processing amount and / or the prescribed time is reached, a display is made. Alternatively, it is characterized in that deterioration timing means such as an alarm is used to warn when the developer should be replaced.

[0037]

According to the first aspect of the invention, the developer is automatically discharged from the developing section before a precipitate is generated in the developer and a new developer is supplied from the replenisher replenishing section.

In the invention described in claim 2, the developing solution is supplied by supplying the diluting water and the concentrated developing solution.

According to the third aspect of the present invention, the developer is automatically discharged from the developing section before a precipitate is generated in the developer and is added to the replenisher to supply an additive for adjusting the novel developer. To do.

According to the fourth aspect of the invention, after discharging the developing solution and before supplying a new developing solution, water or a cleaning solution or cleaning drainage is supplied to the developing section to clean the developing section.

In the fifth aspect of the present invention, after supplying the water or the cleaning liquid or the cleaning drainage to the developing unit, discharging the water or the cleaning liquid or the cleaning drainage, and subsequently adjusting the concentrated developer or the concentrated replenisher and the developer. Add thick additive.

According to the sixth aspect of the present invention, the liquid level detection sensor provided in the developing unit detects the completion of the filling of a new developer supplied after the developer is discharged.

In the invention of claim 7, the photosensitive lithographic printing plate is conveyed in the air in the developing section, and the developing solution in the developing section is circulated to be supplied to the photosensitive lithographic printing plate, and after the new developing solution is filled with liquid. By supplying the replenishing liquid by the processing of the photosensitive lithographic printing plate, the amount of liquid retained at the time of liquid filling increases.

According to the present invention, the discharge port for overflowing the developing solution is provided above the liquid surface which is filled with the new developing solution, or the solution discharging means is operated until the retained solution amount increases to a certain amount. Do not let

In the invention according to claim 9, the processing amount and / or elapsed time of the photosensitive lithographic printing plate after renewing the developer is detected, and when the prescribed processing amount and / or the prescribed time is reached, a predetermined amount is reached. New developer solution is updated at the timing.

According to the tenth aspect of the invention, the liquid circulating means is driven for a certain period of time after the new liquid of the developing liquid is renewed.

According to the eleventh aspect of the present invention, the temperature of the developing solution is automatically adjusted after updating the developing solution with a new solution by operating the update switch, and the photosensitive lithographic printing plate is warmed up so that it can be processed.

In the twelfth aspect of the present invention, by operating the cleaning switch, the developing solution is discharged, and then at least one of water, cleaning solution and cleaning drainage is supplied to the developing section to clean the developing section.

According to the thirteenth aspect of the present invention, a discharge pipe is directly or indirectly connected to the bottom of the developing unit, and a pump, a solenoid valve, or an electric valve is installed in the middle of the discharge pipe, and at least one place of the discharge pipe is provided. By bending the pipe up and down to form an N-type pipe, at least a part of the discharged liquid remains in the middle of the discharge pipe.

In the fourteenth aspect of the present invention, the developing section is supplied with water or a cleaning liquid or cleaning drainage of the cleaning section following the developing section,
Clean the development area.

According to the fifteenth aspect of the present invention, the discharge pipe is directly or indirectly connected to the bottom of the developing unit, a solenoid valve or an electric valve is installed in the middle of the discharge pipe, and the discharge port of the discharge pipe is connected to the developing unit. Lead to the inside of the waste liquid tank installed at the bottom,
The drain pipe from the bottom of the developing unit to the drain port goes from top to bottom so that there is no liquid pool in the drain pipe, and the waste liquid tank is pseudo-sealed.

According to the sixteenth aspect of the present invention, the amount of the developing solution is less than 3 mL / cm ^{2 with} respect to the area obtained by multiplying the width of the photosensitive lithographic printing plate that can be processed by the length of the conveying path of the developing section. The difference in the deterioration of the developer due to the difference in the type of the photosensitive lithographic printing plate is detected.

According to a seventeenth aspect of the present invention, in order to keep the amount of the developing solution to be 3 mL / cm ² or less, the developing unit is slit-shaped with respect to the conveying path of the developing unit, and the dipping structure of the photosensitive lithographic printing plate is used. I am trying.

According to the eighteenth aspect of the invention, in order to keep the amount of the developing solution to 3 mL / cm ² or less, the developing section conveys the photosensitive lithographic printing plate in the air and circulates the developing solution to sensitize the photosensitive lithographic printing plate. The amount of the developer held is the amount necessary for stable circulation of the developer supplied to the plate.

According to the nineteenth aspect of the invention, in order to detect the difference in the deterioration of the developing solution due to the difference in the type of the photosensitive lithographic printing plate, the conductivity, resistance value, impedance and pH of the developing solution are detected.
At least one of the values is used and the detection result corrects the replenisher replenishment amount per area of the photosensitive lithographic printing plate.

In the twentieth aspect of the invention, the developing solution is 33
The temperature is controlled to be controlled within the range of ℃ to 45 ℃.

According to the twenty-first aspect of the invention, at least the upper space of the developing section is covered and pseudo-sealed.

In the twenty-second aspect of the invention, the air brought into contact with the developing solution is blown into the upper pseudo-closed space of the developing section.

According to the twenty-third aspect of the invention, the difference in deterioration of the developer due to the difference in the type of the photosensitive lithographic printing plate is detected,
A deterioration warning means such as a display or an alarm indicating deterioration of the developer is used to warn of the replacement time of the developer.

In the twenty-fourth aspect of the invention, the processing amount and / or elapsed time of the photosensitive lithographic printing plate after renewing the developer is detected, and when the prescribed processing amount and / or the prescribed time is reached, a display or Deterioration warning means such as an alarm warns the developer replacement time.

[0061]

EXAMPLES Examples of the photosensitive lithographic printing plate automatic developing machine of the present invention will be described below, but it goes without saying that the present invention is not limited to these examples.

First, the photosensitive lithographic printing plate automatic developing machine to which the present invention is applied will be described. FIG. 1 is a schematic side view of a photosensitive lithographic printing plate automatic developing machine.

The photosensitive lithographic printing plate automatic developing machine 1 includes a processing section 2
And a drying unit 3, and the imagewise exposed photosensitive lithographic printing plate is automatically conveyed and developed. The processing section 2 includes a developing section 4, a cleaning section 5, and a finisher section 6 arranged in this order, and further includes a replenisher replenishing section A. The developing section 4 is provided with a developing pipe 7 for supplying the developing solution to the photosensitive lithographic printing plate, and the developing pump 8 is operated to spray the developing solution onto the photosensitive lithographic printing plate for development processing. Further, the developing section 4 is provided with a heater 9, and the heater 9 is controlled by the controller J based on the temperature information of the temperature sensor 10 to adjust the temperature of the developing solution in the developing section 4.

The cleaning section 5 comprises a first tank 11, a second tank 12, a third tank 13 and a fourth tank 14, each of which has a water-washing pipe 15 through which a washing liquid is supplied to the photosensitive lithographic printing plate. 18
Is provided and is controlled by the control device J.
A multi-stage countercurrent method is used in which the washing liquid is sprayed onto the photosensitive lithographic printing plate by the operation of No. 22 to perform the washing treatment. Washing pump 1
For 9 to 22, for example, an electromagnetic pump is used. First tank 1
1 is provided with a liquid supply pipe 23 for supplying the cleaning liquid to the photosensitive lithographic printing plate in the developing section 4, and the cleaning liquid is supplied to the first tank 11 by the operation of the liquid supply pump 24 controlled by the controller J during cleaning.
Is supplied to the developing unit 4. The finisher section 6 is provided with a finisher pipe 25 for supplying the finisher liquid to the photosensitive lithographic printing plate, and the finisher pump 26 controlled by the controller J operates to eject the finisher liquid to the photosensitive lithographic printing plate. To process. Liquid delivery pump 2
As the 4 and the finisher pump 26, for example, bellows pumps are used.

A water reserving tank 30 is arranged in the replenisher replenishing section A of the photosensitive lithographic printing plate automatic developing machine 1, and a water level detecting sensor 31 for detecting the liquid level is provided in the water reserving tank 30. Liquid level information is sent to the control device J. Water storage tank 3
0 is connected to a water pipe 33 through a water supply pipe 32,
Based on the liquid level detection information from the liquid level detection sensor 31, the controller J operates the replenishment valve 34 to supply tap water to the water storage tank 30. Water may be supplied to the water storage tank 30 by connecting to the large water tank 39 instead of connecting to the water pipe 33.

The water storage tank 30 is connected to the developing unit 4 through a water supply pipe 41, and the controller J drives the water supply pump 43 based on the liquid level information of the liquid level detection sensor 42 to drive the water in the water storage tank 30. Are supplied to the developing unit 4. Further, the water storage tank 30 is connected to the fourth tank 14 of the cleaning unit 5 via the water supply pipe 44, and the controller J supplies the water supply pump based on the liquid level information of the liquid level detection sensor 45 provided in the first tank 11. The water in the water storage tank 30 is supplied to the fourth tank 14 by driving 46. Similarly, the water storage tank 30 has a water supply pipe 47.
Is connected to the finisher portion 6 via the liquid level detection sensor 48, and the water supply pump 4 is controlled by the controller J based on the liquid level information of the liquid level detection sensor 48.
9 to drive the water in the water storage tank 30 into the finisher section 6
Supplied to As the water supply pumps 43, 46, 49, for example, bellows pumps are used.

The replenisher replenishing section A is provided with a concentrated developer tank 50, a concentrated developer replenisher tank 51, and a concentrated finisher tank 52. The concentrated developer tank 50 is connected to the developing section 4 via a replenishment pipe 53, and the replenishment pump 54 controlled by the controller J operates to supply the concentrated developer solution from the concentrated developer tank 50 to the developing section 4. It
The concentrated developing replenisher tank 51 is connected to the developing section 4 through the replenishing pipe 55, and the replenishing pump 56 controlled by the control device J operates so that the concentrated developing replenisher tank 51 stores the concentrated developing replenisher solution. Is supplied to. Further, the thick finisher liquid tank 52 is connected to the developing unit 4 via the replenishing pipe 57, and the replenishing pump 58 controlled by the control device J operates so that the thick finisher liquid in the thick finisher liquid tank 52 is transferred to the developing unit 4. Supplied. Replenishment pumps 54, 56, 5
For 8, a bellows pump is used, for example.

A discharge pipe 70 is connected to the developing pipe 7 for supplying the developing liquid to the photosensitive lithographic printing plate, and a solenoid valve 71 controlled by the control device J is opened to store the developing liquid in the waste liquid tank 7.
Discharge to 2. The discharge pipe 70 is bent in the vertical direction to provide a liquid pool 70a.

FIG. 2 is a schematic front view of the photosensitive lithographic printing plate automatic developing machine. The photosensitive lithographic printing plate automatic developing machine 1 is provided with a pH detection unit 80 and an aeration unit 90. The pH detector 80 includes a detection tank 81, a pH detection sensor 82, a moving mechanism 83, and a motor 84. The detection tank 81 communicates with the developing unit 4, and the detection tank 81 is supplied with the concentrated developer from the concentrated developer tank 50 and the water is supplied from the water storage tank 30 to be mixed. The movement mechanism 83 is actuated by the drive of the motor 84 controlled by the controller J to move the pH detection sensor 82 between the developing unit 4 and the detection tank 81.

The aeration unit 90 is provided with an aqueous solution storage container 91, and the aqueous solution storage container 91 is open above the developing unit 4. The opening 91a of the aqueous solution storage container 91 and the developing unit 4 are connected via a discharge pipe 92, and the developing solution is discharged from the developing unit 4 to the aqueous solution storage container 91 by the operation of the discharging pump 93 controlled by the controller J. It Exhaust pump 93
For example, a bellows pump is used.

A filter 94 is arranged above the inside of the aqueous solution storage container 91, and a liquid level detection sensor 95 is arranged in this filter 94. Based on the liquid level information, the controller J drives the discharge pump 93 to discharge the developing solution. It is discharged to the aqueous solution storage container 91. Further, a heater 96 and a temperature sensor 97 are arranged in the lower portion inside the aqueous solution storage container 91, and the heater 9 is controlled by the controller J based on the temperature information from the temperature sensor 97.
Control 6 to heat the developer. Further, the aqueous solution storage container 91 is connected to the waste liquid tank 72 via a discharge pipe 98 below the filter 94. Discharge pipe 98
Is provided with a liquid pool 98a which is bent in the vertical direction. An air supply pipe 99 is connected to the aqueous solution storage container 91, and air is supplied from the air supply pipe 99 by the operation of the aeration pump 100 controlled by the controller J to perform aeration.

In this photosensitive lithographic printing plate automatic developing machine,
The replenishment of the developing solution at the time of usual processing is performed by the concentrated developing replenishing solution tank 5
1 to concentrated developing replenisher, for example 5 to 10 mL / m² ,
The cleaning liquid in the first tank 11 of the cleaning unit 5 is transferred to the developing unit 4 by, for example, 10
~ 30 mL / m² , The liquid level detection cell of the first tank 11 of the cleaning unit 5.
When the sensor 45 detects a lack of liquid, water is added to the fourth tank 14 of the cleaning unit 5.
Water is supplied from the storage tank 30, a thick finisher liquid tank
For example, the concentrated finisher liquid from KU 52 is 3 to 20 mL /
m² , When the liquid level detection sensor 48 detects insufficient liquid,
Supply.

The pH detection unit 80 is controlled by newly activating the concentrated developer tank 50 by emptying the pH reference solution detection tank 81 at the start of temperature control and after processing the photosensitive lithographic printing plate for 50 m ^2.
The reference solution is adjusted and supplied with the concentrated developer and water, the pH value is measured, and then the pH detection sensor 82 is moved to measure the pH value of the developer in the developing unit 4. When the pH value of the developing solution in the developing section 4 is vertically shifted as compared with the reference solution, the pH value is increased or decreased by increasing or decreasing the amount of the developing replenishing concentrated solution and the water from the concentrated developing replenishing solution tank 51 supplied thereafter. Keep the value. When the pH value is lowered at the start of temperature control, the pH is corrected by adding the developer replenishing concentrated liquid and water at that time.

The updating control of the developing solution in the developing section 4 is performed by, for example,
After renewing the liquid, the electromagnetic valve 71 for renewing the liquid is opened for 3 to 10 days or 50 to 500 m ² / tank capacity, the developing section 4 is emptied, and then the electromagnetic valve 71 is closed, so that the first tank 11 of the cleaning section 5 is closed. After the cleaning solution is transferred to the developing unit 4, it is circulated for 1 to 10 minutes, the electromagnetic valve 71 is opened and discharged, and then the concentrated developer and water in the concentrated developer tank 50 are supplied to activate the circulation system after the liquid filling.

FIG. 3 is a schematic side view showing another embodiment of the photosensitive lithographic printing plate automatic developing machine. The photosensitive lithographic printing plate automatic developing machine 1 of this example has the same structure as that of FIG.
The developing unit 4 is provided with a heater 110 and a temperature sensor 111, and the controller J adjusts the developing solution to a predetermined temperature by the heater 110 based on the temperature information.

The water in the water storage tank 30 is supplied to the storage tank 120 from the water supply pipe 41. The replenishing liquid is supplied to the storage tank 120 by the operation of the replenishing pump 123 which is connected to the replenishing liquid tank 122 via the replenishing pipe 121 and is controlled by the controller J. As the replenishment pump 123, for example, a bellows pump is used. The storage tank 120 is provided with a pH detection sensor 124, and the pH of the replenisher is detected by the pH detection sensor 124.
The value is measured, and the controller J controls the water supply pump 43 or the replenishment pump 123 based on the measurement information to adjust the pH.

The storage tank 120 is connected to the developing section 4 via a liquid supply pipe 125a and a return pipe 125b, and a replenishment pump 126 is arranged in the liquid supply pipe 125a.
A return pump 127 is arranged at 25b. The replenishment pump 126 and the return pump 127 are, for example, bellows pumps. The replenishing liquid is supplied to the developing unit 4 by controlling the replenishing pump 126 and the return pump 127 by the control device J based on the liquid level information of the liquid level detecting sensor 42 of the developing unit 4. As the replenishment pump 126 and the return pump 127, for example, bellows pumps are used.

Further, the storage tank 120 is provided with the supply pipe 130.
Is connected to the aqueous solution storage container 91 via the
By driving 31, the developing solution is supplied to the aqueous solution storage container 91. The developing unit 4 is connected to the waste liquid tank 72 via a discharge pipe 132, and the discharge liquid is discharged to the waste liquid tank 72 by driving the discharge pump 133 controlled by the controller J. As the supply pump 131 and the discharge pump 133, for example, bellows pumps are used.

FIG. 4 is a schematic side view showing the processing section of the photosensitive lithographic printing plate automatic developing machine. The photosensitive lithographic printing plate automatic developing machine 1 is provided with a processing section 2 and a drying section 3, and in the processing section 2, a developing section 4, a cleaning section 5 and a finisher section 6 are arranged in order. The developing section 4 and the cleaning section 5 are covered with a cover 200, and a valve section 200a is provided at the inlet of the photosensitive lithographic printing plate, and an outlet is also provided with a valve section 200b to close it.

In front of the developing section 4, a pair of carry-in rollers 201 is provided.
Is disposed inside, and the guide roller 202 and the transport roller 203 are disposed inside to face each other.
And the brush roller 205 are arranged to face each other, and then the squeeze roller pair 206 is arranged to face each other. The squeeze roller pair 206 squeezes the photosensitive lithographic printing plate and conveys it to the cleaning unit 5.

Injection pipes 208 to 211 for injecting the developing solution are arranged above the conveying path of the photosensitive lithographic printing plate of the developing section 4, and the developing solution is covered from the injection pipe 208 to the cover 200.
And the developer is ejected from the ejection pipes 209 and 211 to the conveying roller 203 and the squeeze roller pair 206.
And the developing solution is ejected from the ejection pipe 210 toward the brush roller 205.

In the cleaning unit 5, the first tank 11, the second tank 12, the third tank 13 and the fourth tank 14 are partitioned by the flexible members 220 to 223, and the photosensitive lithographic printing plate is the flexible member 220. ~ 22
3 can be conveyed through the valve portions 220a to 223a formed in the sheet. First tank 11, second tank 12, third tank 13
And, in the fourth tank 14, a pair of squeeze rollers 230-233.
Is arranged. Above the conveyance path of the photosensitive lithographic printing plate in the washing tank 5, jet pipes 240 to 24 for jetting the washing liquid are provided.
3 is arranged, and the washing liquid is jetted from the jet pipes 240 to 243 toward the rear of the squeeze roller pairs 230 to 233.

A squeeze roller pair 250 is arranged in the finisher section 6. A squeeze roller pair 251 for finishing the photosensitive lithographic printing plate again is arranged in the finisher section 6, and the squeeze pipe 25 is provided.
The finisher liquid is jetted again from 2, 253 toward the photosensitive lithographic printing plate. The photosensitive lithographic printing plate is conveyed by the guide plate 254 and the conveying roller 255.

A drying roller pair 260 is arranged in the drying section 3, and a drying roller pair 261 for drying the finisher-processed photosensitive lithographic printing plate again is arranged above the drying roller pair 260. A pair of carry-out rollers 262 is arranged at the subsequent stage of the drying unit 3.

Next, the inventions of claims 1 to 25 will be described in detail with reference to FIGS. 1 to 4.

The invention according to claim 1 is provided with a replenishing solution replenishing section A for the developing section 4 containing a developing solution, which automatically conveys the imagewise exposed photosensitive lithographic printing plate, and is continuously made photosensitive. A developer discharging means B for processing the lithographic printing plate and automatically discharging the developing solution from the developing section 4 before a precipitate is generated in the developing solution;
A replenishing solution replenishing section A is provided with a developing solution supplying means C for supplying a new developing solution.

The photosensitive lithographic printing plate is subjected to each processing in the developing section 4, cleaning section 5, finisher section 6 and the like. The development of the photosensitive lithographic printing plate is a development for dissolving the exposed portion or the unexposed portion, and a large amount of the dissolved resin component is accumulated in the developer in the developing portion 4. Further, the developing solution is a highly alkaline solution of silicate, and the silicate is difficult to be redissolved when deposited. Further, the base material of the photosensitive lithographic printing plate is generally an aluminum plate, and aluminum is eluted in the developing solution. For this reason, precipitates intricately related to resin components, silicates, aluminum ions, calcium and magnesium components from dissolved water, and the like accumulate in the developer.

For this reason, the photosensitive lithographic printing plate, the developing solution, and the like have been studied with the aim of preventing precipitation.
Due to the basic composition, precipitation-free development cannot be realized, and there is only the effect of prolonging the replacement frequency of the developer. Therefore, as a result of studying this precipitate, it was found that the higher the concentration of the components eluted from the photosensitive lithographic printing plate, the more the precipitate is generated. As a result of diligent research on this development, a developer discharge means B for automatically discharging the developer from the developing section 4 before a precipitate is generated in the developer and a new developer from the replenisher replenishing section A are supplied. Precipitation was prevented by providing the developing solution supply means C for

That is, the developing solution is automatically discharged from the developing section 4 before a precipitate is generated in the developing solution, and the developing section is automatically discharged when a predetermined period of time or a predetermined processing amount in a region where no precipitation occurs is reached. Prevent the precipitation by renewing the developer.

This is to detect the state of precipitation of the components of the developing solution, which are eluted from the photosensitive lithographic printing plate such as PS plate, and discharge according to the detection result. Further, it is preliminarily investigated how much the developing solution should process the photosensitive lithographic printing plate to generate the precipitate, and it is detected that the processing amount has been processed, and it is automatically discharged according to the detection result. Also,
It is preliminarily investigated how long the developer is retained in the developing section 4 to generate the precipitate, and the time is detected, and the precipitate is automatically discharged according to the detection result.

Conventionally, the developing tank liquid discharging mechanism is a manual valve or the like, and is manually operated. In the present invention, this is fully automated and carried out in a short time without precipitation.
This measure gives the impression that the amount of waste liquid in the developing section 4 increases significantly, but, for example, in the case of a large-sized photosensitive lithographic printing plate automatic developing machine, the amount of developing solution held is 60 liters, and conventionally, We are instructing to change this once every three months, but if we have a holding volume of 5 liters, the liquid will be renewed 12 times in three months and the same amount of waste liquid will be obtained.

This is liquid renewal once a week. Further, if the holding amount is 3 liters, it is possible to renew with the same amount of waste liquid once every 3 days. That is, in contrast to what was conventionally devised for prolonging the liquid exchange, it is an invention that does not require the user to perform the liquid exchange by automatically updating the liquid in a short time.

Further, by reducing the amount of the developing unit 4 held, the concentration of the components eluted from the photosensitive lithographic printing plate in the developing solution approaches the recovery concentration in a shorter period than before, but becomes a high concentration close to the recovery concentration. However, it has been found that precipitation does not occur unless the time elapses. For example, automatic liquid renewal is preferably performed within 3 weeks. It is more preferably within 10 days, and most preferably within 1 to 4 days.

According to the second aspect of the invention, the developing solution supply means C is used.
Is composed of a dilution water supply means D for supplying dilution water and a concentrated developer supply means E for supplying a concentrated developer. The developer is supplied by supplying diluted water of water from the water storage tank 30 and the concentrated developer in the concentrated developer tank 50. By using this developer supply system, the stock of the stored supply solution is stored. The space is small, which is preferable. Further, it is preferable that the fluctuation of the developing property due to the variation at the time of adjusting the developing solution can be suppressed.

According to the third aspect of the present invention, the developer is automatically added to the replenisher in the replenisher A and the developer ejecting means B for automatically ejecting the developer from the developing section before a precipitate is generated in the developer. And an additive supply means F for supplying an additive for adjusting a new developer.

The developing solution is automatically discharged from the developing section 4 to the waste liquid tank 72 before the precipitate is generated in the developing section.
When the method of adding an additive to the replenisher is used as a method of adjusting this new developer by supplying an additive that adjusts a new developer by adding it to the replenisher, It is preferable that the stock space of each liquid in the photosensitive lithographic printing plate automatic developing machine 1 can be reduced by increasing the temperature.

According to the fourth aspect of the invention, the developing section 4 is provided with a cleaning solution supply means L for supplying water or cleaning solution or cleaning drainage of the cleaning section 5 following the developing section 4, and after the developing solution is discharged, a new developing solution is supplied. Before supplying the water, the cleaning unit or the cleaning liquid is supplied to the developing unit to wash the developing unit.

After discharging the developing solution and before supplying a new developing solution, water or cleaning liquid or cleaning drainage is supplied to the developing section 4,
After the developing section 4 is washed and the developing solution is discharged from the developing section 4, it is necessary to introduce water, a cleaning solution, and cleaning drainage.
The inside is cleaned, which is effective in preventing the occurrence of precipitation. Further, in order to reduce the waste liquid, it is preferable to use a cleaning liquid (water washing step or the like) or its drainage rather than using new water such as tap water.

According to the fifth aspect of the invention, the liquid circulating means G is provided in the developing section 4, and after the water or the cleaning liquid or the cleaning drainage is supplied to the developing section 4, the liquid circulating means G is operated for a certain period of time so that the water or the cleaning liquid or After the cleaning waste water is discharged, a concentrated developer or a concentrated replenisher and a concentrated additive for adjusting the developer are added.

After supplying water or the cleaning liquid or the cleaning drainage to the developing section 4, after discharging the water or the cleaning liquid or the cleaning drainage, a concentrated developer or a concentrated additive for adjusting the concentrated replenisher and the developer is added, Introducing water, a cleaning liquid, and cleaning drainage after discharging the developing solution from the developing section 4 cleans the inside of the developing section 4, and is effective in preventing the occurrence of precipitation. Further, in order to reduce the waste liquid, it is preferable to use a cleaning liquid (water washing step or the like) or its drainage rather than using new water such as tap water.

According to the sixth aspect of the present invention, the developing unit 4 is provided with the liquid level detection sensor 42 to detect the completion of the filling of a new developing solution supplied after the developing solution is discharged. The liquid level sensor 42 provided in the developing unit 4 detects the completion of filling of a new developer supplied after discharging the developer. When the new developer is automatically filled with the liquid, it is preferable to use the liquid level detection sensor 42 as a structure for detecting the supply amount because it is reliable with respect to, for example, a method of supplying a constant amount pump. As the liquid level detection sensor 42, there are an electrode type and a float type, and any of them may be used.

According to a seventh aspect of the present invention, the photosensitive lithographic printing plate is carried in the developing section 4 in the air, and a liquid circulating means G for circulating the developing solution in the developing section 4 and supplying it to the photosensitive lithographic printing plate is provided. Further, as shown in FIG. 5, the bottom portion 4a of the developing section 4 is tapered to supply a replenisher by the process of the photosensitive lithographic printing plate after the new developing solution is filled with the developer, so that the amount of the retained solution at the time of the filling is increased. It is configured to do.

The photosensitive lithographic printing plate is conveyed in the air in the developing section 4, the developing solution in the developing section 4 is circulated and supplied to the photosensitive lithographic printing plate, and the new developing solution is filled with the photosensitive lithographic printing plate. The supply of the replenishing liquid by the process of 1 increases the amount of the liquid retained when the liquid is filled. In the developing section 4, the precipitate generated in the developer is particularly likely to occur on the wall surface at the gas-liquid interface, the conveying parts, etc.
On the other hand, by moving the liquid surface in the increasing direction, it is possible to more effectively prevent the precipitation generated at the gas-liquid interface. In addition, the supply of the replenishing liquid has the effect of diluting the eluted components from the photosensitive lithographic printing plate, and by increasing the retained amount, the concentration of the dissolved components in the photosensitive lithographic printing plate can be reduced. It can be lower than a certain level, and it is effective in preventing precipitation.

According to the eighth aspect of the present invention, in FIG. 5, as a means for increasing the amount of retained liquid at the time of liquid filling, the discharge port 300 for overflowing the developing liquid is provided above the liquid surface for filling the new developing liquid. This is a structure in which the liquid discharge means 301 is not provided or the liquid discharge means 301 is not operated until the amount of retained liquid increases to a certain amount. The liquid discharge means 301 is composed of, for example, a discharge pipe 302 and a solenoid valve 303, and the solenoid valve 303 increases the amount of retained liquid at the time of liquid filling, and does not operate until it reaches a certain amount. This is a preferable method of increasing the amount. For example, if a separate tank is provided and stored in it, the liquid level transfer effect is lost and precipitation cannot be prevented.

The invention according to claim 9 is provided with a new solution renewing means H for the developing solution, and this new solution renewing means H is constituted by a controller J and the processing amount of the photosensitive lithographic printing plate after the development solution is renewed. And / or the elapsed time is detected, and when the specified processing amount and / or the specified time is reached, a new solution of the developing solution is updated at any one of the following timings. Control commands are input to the control device J from the operation start switch S1, the temperature adjustment start switch S2, the operation stop switch S3, and the low temperature protection temperature adjustment switch S4.

In the operation stopped state, the liquid renewal control is immediately executed.

In the operation stop state, the operation start switch S
1 or the temperature control start switch S2 is turned on to perform the liquid renewal control.

In the in-operation state, the operation stop switch S3
Alternatively, the liquid renewal control is performed by turning on the low temperature protection temperature control switch S4.

In the in-operation state, the liquid renewal control is executed by turning on the next operation start switch S1 or the temperature adjustment start switch S2.

In the operating state, the developing section liquid is discharged and washed when the operation is stopped, and the next operation start switch S
1 or the temperature control start switch S2 is turned on to perform update control for supplying a new developer.

In this way, the processing amount and / or elapsed time of the photosensitive lithographic printing plate after the developer was renewed was detected,
When the prescribed processing amount and / or the prescribed time is reached, the developer is renewed at a predetermined timing of the above-mentioned, and the preferable timing of the renewal of the developer capable of effectively preventing the precipitation without affecting the development. Is.

Here, the elapsed time is preferably within 3 weeks, more preferably within 10 days, and most preferably 1 to 4
In the range of days, precipitation can be effectively prevented. Also, provision processing amount is preferably in the range of the developer holding amount per liter photosensitive lithographic printing plate 20～2000M ^2, more preferably from 50 to 500 m ² range, and most preferably the precipitation range of 100 to 200 m ² It can be effectively prevented.

According to the tenth aspect of the present invention, the liquid circulating means G is provided in the developing section 4, and the liquid circulating means G is driven for a certain period of time after the renewal of the developing solution. As described above, after the renewal of the developing solution, the controller J drives the solution circulating means G for a certain period of time to prevent the partial retention of the developing solution before the renewal in the developing section 4 and prevent the precipitation. .

According to the eleventh aspect of the present invention, a liquid circulating means G for circulating the developer in the developing section 4 to supply it to the photosensitive lithographic printing plate, and a liquid heating temperature adjusting means for heating the developer to adjust the temperature. K, and a new solution updating means H for the developing solution and a new solution updating switch S5 are provided. By operating the updating switch, the temperature of the developing solution is automatically adjusted after the developing solution is updated. It is configured to warm up the printing plate so that it can be processed. In this way, by operating the update switch, the temperature of the developing solution is automatically adjusted after updating the developing solution with a new solution, and the photosensitive lithographic printing plate is warmed up so that it can be processed.
Is a device that is used less frequently, for example, it is a device that enables precipitation prevention under severe usage conditions where the user normally turns off the power, such as one day / one week. Stable performance can be obtained in terms of sex.

According to a twelfth aspect of the present invention, a developing solution discharging means B for automatically discharging the developing solution from the developing section 4 before a precipitate is generated in the developing solution and water or developing section 4 in the developing section 4 are used. A cleaning liquid supply means L for supplying a cleaning liquid or cleaning drainage for the subsequent cleaning unit 5 and a cleaning switch S6 for cleaning the developing unit 4 are provided.
By this cleaning switch operation, after discharging the developing solution, at least one of water, cleaning solution, and cleaning drainage is supplied to the developing section 4,
The developing unit 4 is configured to be washed. in this way,
After the developing solution is discharged by operating the cleaning switch, at least one of water, cleaning solution, and cleaning drainage is supplied to the developing section 4, and the developing section 4 is cleaned. Even for a user who does not use the photosensitive lithographic printing plate automatic developing machine 1 for about 10 days, the occurrence of precipitation is reduced. That is, for example, by pressing the cleaning switch S6 before entering long holidays, the photosensitive lithographic printing plate automatic developing machine 1 is brought into a clean state.

According to the thirteenth aspect of the present invention, the developing solution discharging means B for automatically discharging the developing solution from the developing section 4 before a precipitate is generated in the developing solution is shown in FIG. 1 and FIG. The discharge pipes 70 and 132 are directly attached to the bottom portion, or are shown in FIGS.
A discharge pipe 98 is indirectly connected to the bottom of the developing unit 4, and a pump, a solenoid valve, or an electric valve is installed in the middle of the discharge pipes 70, 98, and at least one of the discharge pipes 70, 98, 132 is N-type. By bending the pipes up and down to form the liquid reservoirs 70a and 98a and piping, at least a part of the liquid to be discharged remains in the middle of the discharge pipes 70 and 98.

Further, as shown in FIG. 6, a discharge pipe 310 of the developing unit 4 is provided, and a discharge member 311 such as a pump, a solenoid valve, an electric valve or the like is installed in the middle of the discharge pipe 310, and the discharge member 311. By providing the liquid reservoirs 310a and 310b by bending the first and second stages up and down into an N-type, the developer remains in the discharge pipe 310 after the developer in the developing unit 4 is drained. It prevents the discharge member 311 such as a solenoid valve or a motor-operated valve from drying to generate precipitates. At least one of the discharge pipes 310
By bending the portion upward and downward to form an N type and providing the liquid pool, at least a part of the liquid to be discharged remains in the middle of the discharge pipe.

In the fourteenth aspect of the present invention, the developing unit 4 is provided with the cleaning liquid supply means L for supplying water or the cleaning liquid or the cleaning drainage of the cleaning unit 6 following the developing unit 4. When the developing solution in the developing section 4 is drained, water or a cleaning solution is supplied, and drain pipes 70, 9
By supplying water or the cleaning liquid to the liquid pool portions 70a, 98a, 310a of the 8, 310, it is possible to more effectively prevent the sedimentation of the discharge pipe or the like.

According to the fifteenth aspect of the present invention, there is provided a developing solution discharging means B for automatically discharging the developing solution from the developing section 4 before a precipitate is generated in the developing solution. The drainage pipe 70 is directly or indirectly connected to the bottom of the portion 4, a solenoid valve 71 or a motor-operated valve is installed in the middle of the drainage pipe 70, and the drainage port of the drainage pipe 70 is installed below the developing unit. The drain pipe 70 from the bottom of the developing unit 4 to the discharge port is guided from the top to the bottom so that there is no liquid pool in the discharge pipe 70, and the waste liquid tank 72 is pseudo-sealed. ing. It is possible to prevent the developer attached to the discharge pipe 70, the solenoid valve 71, or the motor-operated valve from evaporating and depositing a precipitate by pseudo-sealing including the path to the waste liquid tank 72. Pseudo-sealing means that it is possible to provide a small air vent hole in the waste liquid tank 72, which means that evaporation is not promoted in the open state.

According to a sixteenth aspect of the present invention, the amount of the developing solution is less than 3 mL / cm ^{2 with} respect to the area obtained by multiplying the width of the photosensitive lithographic printing plate that can be processed by the length of the conveying path of the developing section 4. A deterioration detecting means for detecting a difference in deterioration of the developing solution due to a difference in the type of the photosensitive lithographic printing plate is provided. The width of the photosensitive lithographic printing plate is detected by the width detection sensor S7 arranged in the width direction in the preceding stage of the developing unit 4, and the width information from the width detection sensor S7 is input to the control device J. Alternatively, the user may manually input the control device J during processing. The length of the transport path of the developing unit 4 is input in advance to the controller J, and the area obtained by multiplying the width of the photosensitive lithographic printing plate that can be processed by the controller J and the length of the transport path of the developing unit 4 is used. Calculate the amount of developer held against
It is less than mL / cm ² , and the difference in deterioration of the developer due to the difference in the type of the photosensitive lithographic printing plate is detected, and the developability is maintained stable to prevent the occurrence of precipitation in the developer. That is, the holding amount of the developing unit 4 is extremely reduced to 3 mL / cm ² or less to increase the renewal rate during the processing of the developing unit liquid, and to prevent the precipitation from occurring by shortening the retention of the developing liquid. However, the replenishment amount varies depending on the type of the photosensitive lithographic printing plate, whereas in the past, a constant replenishment amount was supplied to increase the holding amount of the developing unit 4 to provide a buffer property and stabilize the developability. However, since the holding amount of the developing unit 4 decreases, the fluctuation of the replenishment amount depending on the type of the photosensitive lithographic printing plate has an influence, and therefore a means for detecting the difference in the deterioration of the developing solution due to the difference in the photosensitive lithographic printing plate. It is necessary to use together.

According to the seventeenth aspect of the invention, in order to keep the amount of the developing solution to 3 mL / cm ² or less, as shown in FIG. The developing unit 4 having the immersion structure of the planographic printing plate is used, and the conveying roller pair 321 and the brush roller 322 are provided in the conveying path 320.
Is arranged. Further, as shown in FIG.
Of the photosensitive lithographic printing plate having a slit shape with respect to the transport path 330, the transport roller pair 331 is provided in the front stage of the transport path 330, and the transport roller pair 332 is provided in the rear stage.
And the brush roller pair 333 is arranged on the slit-shaped transport path 330.

As described above, the transport path 320 of the developing unit 4,
When the photosensitive lithographic printing plate having a slit shape is used for 330, the liquid amount in the developing unit 4 can be reduced. Further, it is preferable that stable development can be performed with a small amount of developing solution, and the slits of the developing unit 4 can be divided into upper and lower parts or easily removed and cleaned.

According to the eighteenth aspect of the present invention, the developing section 4 conveys the photosensitive lithographic printing plate in the air as shown in FIG. 9 in order to keep the amount of the developing solution to 3 mL / cm ² or less. Circulating means G for circulating and supplying liquid to the photosensitive lithographic printing plate
With the structure having the above, the amount of the developer held is the amount necessary to stably circulate the developer. As described above, it is preferable that stable development is possible by circulating a small amount of the developing solution, and the nozzles 208 to 211 for ejecting the developing solution sent from the developing pipe 7 are removable and washable.

In a nineteenth aspect of the present invention, at least one of the conductivity, resistance value, impedance and pH value of the developing solution is used as deterioration detecting means for detecting a difference in deterioration of the developing solution due to a difference in the type of the photosensitive lithographic printing plate. The amount of replenisher replenished per area of the photosensitive lithographic printing plate is corrected according to the detection result. FIG. 2 shows a method for comparing and detecting a PH value, which has a structure in which the pH reference solution in the detection tank 81 is measured every time, and the PH value of the developing solution in the developing section 4 is measured using this as a comparison.

That is, at the start of temperature control and after processing the photosensitive lithographic printing plate for 50 m ² , the pH reference liquid detection tank 81 is emptied, and the reference liquid is newly adjusted and supplied with the concentrated liquid and water in the concentrated tank 50. After measuring the pH value, the pH detection sensor 82 is moved to measure the pH value of the developer in the developing section 4. When the pH value of the developing solution in the developing unit 4 is vertically displaced from the reference solution, the pH value is maintained by increasing or decreasing the amounts of the developer replenishing concentrated solution and water to be supplied thereafter. When the pH value is lowered at the start of temperature control, the pH is corrected by adding the developer replenishing concentrated liquid and water at that time.

According to the twentieth aspect of the invention, the developing section 4 is provided with heaters 9 and 110 which are developing solution heating means and temperature sensors 10 and 111 which are solution temperature detecting means, and the developing solution is heated to 33 ° C.
To 45 ° C in the range of temperature control. The developing unit 4 generally has a temperature range of 25 to 30 ° C. in order to perform stable development.
The liquid temperature is adjusted with an accuracy of 0.3 to 1.0 ° C. This is due to the control of the temperature sensor and the heater. Further, it is preferable to further raise the temperature to 33 to 45 ° C. because the development is accelerated, but there is a drawback that the precipitation of the precipitate in the developing solution is accelerated due to the high temperature. However, in the present invention, in order to effectively suppress the occurrence of precipitation,
High temperature development of 5 ° C is possible. In the high temperature development of 33 to 45 ° C., it is preferable to add low temperature protection at the time of stopping operation so that the liquid temperature does not drop below 10 ° C. That is, it is not preferable that the temperature fluctuates up and down because it promotes the occurrence of precipitation. Therefore, it is preferable to perform low-temperature protection so that the temperature does not drop below a certain temperature.

According to the twenty-first aspect of the present invention, as shown in FIG. 4, at least the upper space of the developing section 4 is covered so as to be pseudo-sealed. Covering at least the upper space of the developing section 4 has a combined effect of suppressing evaporation of the developing solution and suppressing the occurrence of precipitation in the developing solution.

According to the twenty-second aspect of the invention, as shown in FIG. 4, the air brought into contact with the developing solution is blown into the upper pseudo-closed space of the developing section 4. In this way, by covering the upper space of the developing section 4 and making it pseudo-sealed, and blowing the air in contact with the developing solution into the upper space, the surface of the developing solution is cooled and evaporation can be further suppressed. As the developing solution, drainage of the developing solution of the developing section 4, tank solution, new solution, replenishing solution, etc. can be used. In addition, it is more preferable that the temperature of the developer to be contacted is adjusted to the same level as that of the developer. The removal of carbon dioxide gas in the blown air and the carbon dioxide gas of the developing portion liquid due to high humidity suppress the deterioration of pH and the deterioration of evaporation and concentration.

According to a twenty-third aspect of the present invention, there is provided deterioration detecting means for detecting a difference in deterioration of the developer due to a difference in the type of the photosensitive lithographic printing plate described above, and a deterioration alarm such as display or alarm of deterioration of the developer is provided. Means M warns when the developer should be replaced. This is another countermeasure against the precipitation of the developing solution, and the user is notified by the deterioration warning means M such as a display and an alarm so that the user does not forget to replace the solution.

The invention as set forth in claim 24, wherein the processing amount and / or elapsed time of the photosensitive lithographic printing plate after renewing the developer is detected, and when the specified processing amount and / or the specified time is reached, a display or Deterioration warning means such as an alarm warns the developer replacement time.

[0131]

As described above, according to the first aspect of the present invention, in the first aspect of the invention, the developer is automatically discharged from the developing unit before a precipitate is generated in the developer, and the replenisher is added. Since a new developer is supplied from the replenishing unit, the developer is automatically discharged from the developing unit before a precipitate is generated in the developer, and when a predetermined period of time or a predetermined processing amount in the area where precipitation does not occur is reached. Precipitation can be prevented by renewing the developing solution in the developing section, and the treatment of precipitation due to dissolution of the exposed section or the unexposed section can be performed quickly and easily.

According to the second aspect of the invention, the supply of the developing solution is
Since the dilution water and the concentrated developing solution are supplied, the stock space of the supply solution to be stored becomes small, and the fluctuation of the developability due to the dispersion at the time of adjusting the developing solution can be suppressed.

According to the third aspect of the invention, the developer is automatically discharged from the developing section before a precipitate is generated in the developer and the additive is added to the replenisher to adjust the novel developer. Therefore, the replenishment rate of the replenisher can be increased to reduce the stock space of each solution in the photosensitive lithographic printing plate automatic developing machine.

According to a fourth aspect of the invention, after discharging the developing solution,
Since water, a cleaning liquid, or cleaning waste water is supplied to the developing section before supplying a new developing solution, the inside of the developing section 4 is cleaned, which has the effect of preventing precipitation and reducing the amount of waste liquid.

According to a fifth aspect of the present invention, after supplying water or cleaning liquid or cleaning drainage to the developing section, discharging water or cleaning liquid or cleaning drainage, and subsequently adjusting concentrated developer or concentrated replenisher and developer. Since a rich additive is added, it has the effects of preventing precipitation and reducing waste liquid.

According to the sixth aspect of the present invention, the liquid level detection sensor provided in the developing unit detects the completion of the filling of a new developer supplied after the developing solution is discharged. Therefore, the completion of the filling of a new developer is detected. Is certain.

According to a seventh aspect of the present invention, the photosensitive lithographic printing plate is conveyed in the air in the developing section, and the developing solution in the developing section is circulated to be supplied to the photosensitive lithographic printing plate. By supplying the replenishing liquid by the treatment of the photosensitive lithographic printing plate of, the amount of the liquid retained at the time of liquid filling increases, so that the precipitation generated at the gas-liquid interface can be more effectively prevented, and by supplying the replenishing liquid, It has the effect of diluting the components eluted from the photosensitive lithographic printing plate, and by increasing the amount retained,
The concentration of the dissolved components of the photosensitive lithographic printing plate can be made lower than a certain amount, which is effective in preventing precipitation.

According to the present invention, the discharge port for overflowing the developing solution is provided above the liquid surface for filling the new developing solution, or the solution discharging means is operated until the retained solution amount increases to a certain amount. Because it is not allowed, it can be easily held.

According to a ninth aspect of the present invention, the processing amount and / or elapsed time of the photosensitive lithographic printing plate after the developer is renewed is detected, and when the prescribed processing amount and / or the prescribed time is reached, a predetermined amount is detected. A new developer can be renewed at a preferable timing.

According to the tenth aspect of the invention, since the liquid circulating means is driven for a certain period of time after the renewal of the developing solution, the pre-renewal in the developing section and the partial stagnation of the developing solution are prevented to prevent precipitation. Can be prevented.

In the eleventh aspect of the present invention, the temperature of the developing solution is automatically adjusted after updating the developing solution with a new solution by operating the update switch, and the photosensitive lithographic printing plate is warmed up so that it can be processed. It is possible to prevent precipitation below and to obtain stable performance in terms of developability.

According to the twelfth aspect of the invention, since the developing solution is discharged by operating the cleaning switch, at least one of water, the cleaning solution and the cleaning drainage is supplied to the developing section, so that the developing section can be cleaned.

According to a thirteenth aspect of the present invention, a discharge pipe is directly or indirectly connected to the bottom of the developing unit, and a pump, a solenoid valve, or an electric valve is installed in the middle of the discharge pipe, and at least one place of the discharge pipe is By bending the pipe up and down to form an N-type pipe, at least a part of the liquid to be discharged remains in the middle of the discharge pipe, so that the discharge member such as the solenoid valve and the motor-operated valve may be dried and precipitates may be generated. Can be prevented.

According to the fourteenth aspect of the invention, since the water is supplied to the developing section or the cleaning liquid or the cleaning drainage of the cleaning section following the developing section, the developing section can be cleaned.

According to a fifteenth aspect of the present invention, a discharge pipe is directly or indirectly connected to the bottom of the developing unit, a solenoid valve or an electric valve is installed in the middle of the discharge pipe, and the discharge port of this discharge pipe is connected to the developing unit. It leads to the inside of the waste liquid tank installed in the lower part, and the discharge pipe from the bottom of the developing section to the discharge port goes from top to bottom so that there is no liquid pool in the middle of the discharge pipe, and the waste liquid tank is pseudo-sealed, It is possible to prevent the developer from evaporating and depositing a precipitate by pseudo-sealing including the route to the waste liquid tank.

According to a sixteenth aspect of the present invention, the retained amount of the developer is 3 mL / cm ² or less with respect to the area obtained by multiplying the width of the photosensitive lithographic printing plate that can be processed by the length of the transport path of the developing section. Since the difference in the deterioration of the developer due to the difference in the type of the photosensitive lithographic printing plate is detected, it is possible to maintain the developability stably and prevent the occurrence of precipitation in the developer.

According to a seventeenth aspect of the present invention, the immersion structure of the photosensitive lithographic printing plate is such that the developing section has a slit shape with respect to the conveying path of the developing section in order to keep the amount of the developing solution to 3 mL / cm ² or less. Therefore, the amount of developer can be reduced.

According to the eighteenth aspect of the invention, in order to keep the amount of the developing solution to 3 mL / cm ² or less, the developing section conveys the photosensitive lithographic printing plate in the air and circulates the developing solution to perform the photosensitive lithographic printing. Since the amount of the developer that is supplied to the plate to stably circulate the developer is the retained amount of the developer, stable development is possible by circulating a small amount of the developer.

According to a nineteenth aspect of the present invention, in order to detect a difference in deterioration of the developing solution due to a difference in the type of the photosensitive lithographic printing plate, at least one of conductivity, resistance value, impedance and pH value of the developing solution is set. The amount of replenisher replenished per area of the photosensitive lithographic printing plate can be easily and accurately corrected by using the detection result.

According to the twentieth aspect of the invention, the developing solution is kept at 33 ° C.
Since the temperature is controlled to be in the range of from 45 to 45 ° C., development can be promoted and precipitation can be effectively suppressed.

The invention described in claim 21 has a combined effect of suppressing evaporation of the developing solution and suppressing precipitation in the developing solution because at least the upper space of the developing section is covered and pseudo-sealed.

According to the twenty-second aspect of the invention, the air brought into contact with the developing solution is blown into the upper pseudo-closed space of the developing section.
There is a combined effect of further suppressing the evaporation of the developing solution and suppressing the occurrence of precipitation in the developing solution.

According to a twenty-third aspect of the present invention, it is possible to detect the difference in the deterioration of the developing solution due to the difference in the type of the photosensitive lithographic printing plate, and display the deterioration of the developing solution or use a deterioration warning means such as an alarm to replace the developing solution. Since the alarm is issued, it is possible to prevent the user from forgetting to replace the liquid.

According to the twenty-fourth aspect of the invention, the processing amount and / or elapsed time of the photosensitive lithographic printing plate after renewing the developer is detected, and when the prescribed processing amount and / or the prescribed time is reached, a display or Since the deterioration warning means such as an alarm warns the replacement timing of the developing solution, the warning is given at an appropriate time, and the user can be prevented from forgetting to replace the solution.

[Brief description of drawings]

FIG. 1 is a schematic side view of a photosensitive lithographic printing plate automatic developing machine.

FIG. 2 is a schematic front view of a photosensitive lithographic printing plate automatic developing machine.

FIG. 3 is a schematic side view showing another embodiment of the photosensitive lithographic printing plate automatic developing machine.

FIG. 4 is a schematic side view showing a processing section of a photosensitive lithographic printing plate automatic developing machine.

FIG. 5 is a schematic side view showing another embodiment of the processing unit of the photosensitive lithographic printing plate automatic developing machine.

FIG. 6 is a schematic side view showing another embodiment of the developing section of the photosensitive lithographic printing plate automatic developing machine.

FIG. 7 is a schematic side view showing another embodiment of the developing unit of the photosensitive lithographic printing plate automatic developing machine.

FIG. 8 is a schematic side view showing another embodiment of the developing section of the photosensitive lithographic printing plate automatic developing machine.

FIG. 9 is a schematic side view showing another embodiment of the developing unit of the photosensitive lithographic printing plate automatic developing machine.

[Explanation of symbols]

 1 Photosensitive lithographic printing plate automatic developing machine 4 Developing section A Replenisher replenishing section B Developing solution discharging means C Developing solution supplying means

Claims (24)

[Claims] 1. A photosensitizer comprising a replenisher replenisher for a developer containing a developer, which automatically conveys an image-exposed photosensitive lithographic printing plate and continuously processes the photosensitive lithographic printing plate. In a lithographic printing plate automatic developing machine, a developing solution discharging means for automatically discharging the developing solution from the developing section before a precipitate is generated in the developing solution, and a new developing solution is supplied from the replenishing solution replenishing section. A photosensitive lithographic printing plate automatic developing machine comprising a developer supply means. 2. The photosensitive lithographic printing plate according to claim 1, wherein the developing solution supplying means comprises a diluting water supplying means for supplying diluting water and a concentrated developing solution supplying means for supplying a concentrated developing solution. Plate automatic processor. 3. A photosensitizer which comprises a replenisher replenisher for a developer containing a developer, automatically conveys an image-exposed photosensitive lithographic printing plate, and continuously processes the photosensitive lithographic printing plate. In a lithographic printing plate automatic developing machine, a developer discharge means for automatically discharging the developer from the developing section before a precipitate is generated in the developer, and a replenisher in the replenisher replenisher are added to add a new solution. An automatic developing machine for a photosensitive lithographic printing plate comprising an additive supply means for supplying an additive for adjusting a developing solution. 4. A cleaning solution supply means for supplying water or cleaning solution or cleaning drainage of a cleaning section following the developing section to the developing section,
4. The structure according to claim 1, wherein after the developing solution is discharged and before the new developing solution is supplied, water or a cleaning solution or cleaning drainage is supplied to the developing section to clean the developing section. 5. The photosensitive lithographic printing plate automatic developing machine described in any one of 1. 5. A liquid circulating means is provided in the developing section, and after supplying the water or the cleaning liquid or the cleaning drainage to the developing section, the liquid circulating means is operated for a certain period of time to discharge the water or the cleaning liquid or the cleaning drainage. 4. The photosensitive lithographic printing plate automatic developing machine according to claim 3, further comprising a concentrated developer or a concentrated replenisher and a concentrated additive for adjusting the developer. 6. The liquid level detecting sensor is provided in the developing section, and is configured to detect the completion of liquid filling of a new developing solution supplied after discharging the developing solution.
The photosensitive lithographic printing plate automatic developing machine according to claim 5. 7. A photosensitive lithographic printing plate is conveyed in the air at a developing section,
A liquid circulating means for circulating the developer in the developing section and supplying it to the photosensitive lithographic printing plate is provided. 7. The photosensitive lithographic printing plate automatic developing machine according to any one of claims 1 to 6, which is configured to increase the amount of retained liquid. 8. As a means for increasing the amount of retained liquid at the time of liquid filling, an outlet for overflowing the developer is provided above the liquid surface for filling a new developer, or liquid discharging means is provided for the amount of retained liquid. 8. The photosensitive lithographic printing plate automatic developing machine according to claim 7, wherein the photosensitive lithographic printing plate developing apparatus is configured so as not to be operated until it increases to a certain amount. 9. A photosensitizer which is provided with a replenisher replenisher for a developing section containing a developer, automatically conveys an image-exposed photosensitive lithographic printing plate, and continuously processes the photosensitive lithographic printing plate. An automatic developing machine for lithographic printing plates is provided with a new liquid renewing means for the developing solution, and the processing amount and / or elapsed time of the photosensitive lithographic printing plate after the developing liquid is renewed is detected to determine the prescribed processing amount and / or the prescribed processing amount. When the time is reached, the photosensitive lithographic printing plate automatic developing machine is characterized in that it is configured to update a new developer liquid at any of the following timings. In the operation stop state, liquid renewal control is executed immediately. In the operation stop state, the liquid renewal control is performed by the start of operation or temperature control. In the operating state, the liquid renewal control is performed by stopping the operation or controlling the low temperature protection temperature. In the in-operation state, the liquid renewal control is executed at the next operation or the start of temperature adjustment. In the in-operation state, the developing section liquid is discharged and washed when the operation is stopped, and update control is performed to supply a new developing solution at the next operation or temperature control start. 10. The photosensitive material according to claim 9, wherein the developing section is provided with a liquid circulating means, and the liquid circulating means is driven for a certain period of time after a new solution of the developing solution is renewed. Planographic printing plate automatic processor. 11. A photosensitive material comprising a replenishing solution replenishing section for a developing section containing a developing solution, which automatically conveys an image-exposed photosensitive lithographic printing plate and continuously processes the photosensitive lithographic printing plate. In the lithographic printing plate automatic developing machine, a liquid circulating means for circulating the developing solution in the developing section to supply the photosensitive lithographic printing plate, and a liquid heating temperature adjusting means for heating the developing solution to control the temperature, Further, a new liquid renewal means and a new liquid renewal switch for the developing solution are provided, and by the operation of the renewal switch, the temperature of the developing solution is automatically adjusted after updating the developing solution with the new solution, and the photosensitive lithographic printing plate A photosensitive lithographic printing plate automatic developing machine characterized by being warmed up so that it can be processed. 12. A photosensitive material comprising a replenishing solution replenishing section for a developing section containing a developing solution, which automatically conveys an image-exposed photosensitive lithographic printing plate and continuously processes the photosensitive lithographic printing plate. In a lithographic printing plate automatic developing machine, a developer discharge means for automatically discharging the developing solution from the developing section before a precipitate is generated in the developing solution, and a washing section following the developing section with water or the developing section. Cleaning liquid supply means for supplying cleaning liquid or cleaning drainage,
A washing switch for washing the developing section is provided, and by operating the washing switch, the developing solution is discharged, and then water, a washing solution,
An automatic developing machine for a photosensitive lithographic printing plate, characterized in that at least one of cleaning wastewater is supplied to the developing section to wash the developing section. 13. A photosensitizer which comprises a replenisher replenisher for a developing section containing a developer, automatically conveys an image-exposed photosensitive lithographic printing plate, and continuously processes the photosensitive lithographic printing plate. In a lithographic printing plate automatic developing machine, as a developer discharging means for automatically discharging the developing solution from the developing section before a precipitate is generated in the developing solution, a discharge pipe is directly or indirectly attached to the bottom of the developing section. , A pump, a solenoid valve, or a motor-operated valve is installed in the middle of the discharge pipe, and at least one portion of the discharge pipe is bent upward and downward to form an N-type pipe so that at least a part of the discharged liquid is discharged. A photosensitive lithographic printing plate automatic developing machine characterized in that it is configured to remain in the middle of piping. 14. The photosensitive lithographic printing plate automatic developing machine according to claim 13, wherein the developing section is provided with a cleaning solution supply means for supplying water or a cleaning solution or cleaning drainage of a cleaning section following the developing section. . 15. A photosensitizer which comprises a replenisher replenisher for a developing section containing a developer, automatically conveys an image-exposed photosensitive lithographic printing plate, and continuously processes the photosensitive lithographic printing plate. In the lithographic printing plate automatic developing machine, a developing solution discharging means for automatically discharging the developing solution from the developing section before a precipitate is generated in the developing solution is provided, and as the developing solution discharging means, a bottom part of the developing section is provided. Directly or indirectly connect the exhaust pipe to
A solenoid valve or a motor-operated valve is installed in the middle of the discharge pipe, the discharge port of the discharge pipe is introduced into the waste liquid tank installed below the developing unit, and the discharge pipe from the bottom of the developing unit to the discharge port is A photosensitive lithographic printing plate automatic developing machine, characterized in that there is no liquid pool in the discharge pipe from the top to the bottom, and the waste liquid tank is pseudo-sealed. 16. A photosensitive material comprising a replenishing solution replenishing section for a developing section containing a developing solution, which automatically conveys an image-exposed photosensitive lithographic printing plate and continuously processes the photosensitive lithographic printing plate. In the lithographic printing plate automatic developing machine, the retained amount of the developer is 3 mL / cm ² or less with respect to the area obtained by multiplying the width of the photosensitive lithographic printing plate that can be processed by the length of the transport path of the developing unit, A photosensitive lithographic printing plate automatic developing machine comprising a deterioration detecting means for detecting a difference in deterioration of a developing solution due to a difference in type of the lithographic printing plate. 17. A developing unit having a dipping structure of the photosensitive lithographic printing plate, wherein the developing unit has a slit shape with respect to a conveyance path of the developing unit so that the amount of the developing solution held is 3 mL / cm ² or less. The photosensitive lithographic printing plate automatic developing machine according to claim 16, wherein 18. The photosensitive lithographic printing plate is conveyed to the developing section in the air so that the amount of the developing solution held is 3 mL / cm ² or less, and the developing solution is circulated to form the photosensitive lithographic printing plate. 17. The photosensitive lithographic printing plate automatic developing machine according to claim 16, further comprising: a liquid circulating means for supplying the liquid, wherein the amount required for stably circulating the developing liquid is the amount of the developing liquid retained. 19. A deterioration detecting means for detecting a difference in deterioration of a developer due to a difference in type of the photosensitive lithographic printing plate,
17. The method according to claim 16, wherein at least one of conductivity, resistance value, impedance and pH value of the developing solution is used, and the replenishing solution replenishing amount per area of the photosensitive lithographic printing plate is corrected according to the detection result. The photosensitive lithographic printing plate automatic developing machine according to claim 18. 20. The developing section is provided with a developing solution heating means and a solution temperature detecting means, and the developing solution is temperature-adjusted and controlled within a range of 33 ° C. to 45 ° C. 5. The photosensitive lithographic printing plate automatic developing machine described in any one of 1. 21. The method according to claim 1, wherein at least an upper space of the developing unit is covered and is pseudo hermetically sealed.
0. The photosensitive lithographic printing plate automatic developing machine as described in 0. 22. The air brought into contact with the developing solution is blown into the pseudo-closed space above the developing section.
1. The photosensitive lithographic printing plate automatic developing machine described in 1. 23. A photosensitive material comprising a replenisher replenishing portion for a developing portion containing a developing liquid, which automatically conveys an image-exposed photosensitive lithographic printing plate and continuously processes the photosensitive lithographic printing plate. In the lithographic printing plate automatic developing machine, a deterioration detecting means for detecting a difference in deterioration of the developing solution due to a difference in the type of the photosensitive lithographic printing plate is provided, and the deterioration warning means such as displaying or alarming the deterioration of the developing solution is used for development. An automatic developing machine for photosensitive lithographic printing plates, which warns when the liquid should be replaced. 24. A deterioration warning such as a display or an alarm is detected when the processing amount and / or elapsed time of the photosensitive lithographic printing plate after updating the developing solution is detected and the specified processing amount and / or the specified time is reached. 24. The photosensitive lithographic printing plate automatic developing machine according to claim 23, wherein a warning is issued by means of the means for replacing the developing solution.