JPH0581843U - Post-development processing device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent backflow of the processing solution. [Structure] The post-processing tank 3 is a device for post-processing the printing plate X that has been developed in the developing tank 1. This device supplies a processing liquid to a printing plate on the downstream side of the roller pair in the printing plate transport direction, with a roller pair including a pair of transport rollers 28 that are inclined so as to receive the printing plate X and transport it obliquely downward. And a spray 29 for spraying.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a post-development processing apparatus that post-develops a photosensitive lithographic printing plate after development processing.

[0002]

[Prior Art]

 The automatic developing device disclosed in JP-A-1-105252 has a developing device and a rinsing device for rinsing a photosensitive lithographic printing plate after development (hereinafter referred to as a printing plate). The rinsing apparatus is provided with a rinsing tank for rinsing the printing plate after the development processing. Two pairs of transport rollers are arranged on the rinse tank, and a rinse liquid ejecting device is provided between the pair of transport rollers. The transport roller of the rinsing device is arranged at the same level as the transport roller of the developing device, whereby the printing plate is transported horizontally from the developing device for rinsing processing.

[0003]

[Problems to be solved by the device]

 In the above-described conventional configuration, since the printing plate is transported in the horizontal direction by the two pairs of transport rollers, the treatment liquid from the rinse treatment device easily flows back to the developing device side. In order to prevent the backflow, a configuration in which a liquid cutting blade is provided on the surface of one of the pair of transport rollers is adopted in the above-mentioned conventional configuration, but the backflow cannot be sufficiently prevented.

An object of the present invention is to prevent backflow of a processing liquid from a post-processing device after development.

[0005]

[Means for Solving the Problems]

 The post-development processing device according to the present invention is a device for post-development processing of a printing plate after development processing. This device includes a roller pair that is inclined so as to receive the printing plate and convey it obliquely downward, and a processing liquid supply unit that supplies the processing liquid to the printing plate downstream of the roller pair in the printing plate conveyance direction. I have it.

[0006]

[Action]

 In the post-development processing apparatus according to the present invention, the pair of rollers arranged on the upstream side of the processing liquid supply unit in the printing plate conveying direction is inclined so as to receive the printing plate and convey it obliquely downward. As a result, the contact portion of the roller pair becomes lower than the height of the uppermost end of the lower roller of the two rollers forming the roller pair, and the processing liquid that easily collects in the contact portion of the roller pair is in the printing plate transport direction. It does not move upstream. As a result, backflow of the processing liquid to the upstream side in the printing plate transport direction can be prevented.

[0007]

【Example】

 FIG. 1 shows an automatic developing device in which an embodiment of the present invention is adopted. This automatic developing device has a developing tank 1 for developing a printing plate on which an image is printed by a printing device (not shown), and a post-processing tank 3 including a washing tank 2a and a rinse processing tank 2b.

The developing tank 1 has a tank main body 1a for storing a developing solution, and a cover 1b for covering the tank main body 1a from above. A large number of guide rollers 7, 8, 9, 10, 14, 17, 17, 18 for guiding the printing plate in the developing tank 1 are arranged in the tank body 1a. Further, between the guide roller 10 and the guide roller 14, a pair of conveying rollers 13 for nipping and conveying the printing plate is provided. A pair of squeezing rollers 21 are arranged in the tank main body 1a at the downstream end in the printing plate conveyance direction.

A pair of brush rollers 15 a and 15 b are arranged between the guide roller 14 and the guide roller 17. The brush rollers 15a and 15b are arranged so as to be capable of being pressed against the printing plate from above and below, and the brush rollers 15a and 15b are brought into contact with the printing plate while rotating to promote the development of the printing plate. One end of the discharge pipe 16 is connected to the center of the lower end of the tank body 1a. The other end of the discharge pipe 16 is connected to the suction side of the circulation pump 12. The discharge side of the pump 12 is connected to the spray pipe 11 via a pipe 11a. The spray pipe 11 is arranged near the transport roller 13 in the tank body 1a. The developer can be sprayed from the spray pipe 11 toward the printing plate surface.

The discharge side of the circulation pump 12 is also connected to the spray 27. The spray 27 is arranged in the tank main body 1a near the lower brush roller 15b. In the tank main body 1a, a developer replenishing pipe 25 is arranged below the spray 27. The discharge port of the replenishment pipe 25 is directed toward the brush roller 15b. Further, the discharge port of the spray 27 is generally directed to the discharge port of the refill pipe 25. As a result, the developer replenished from the replenishing pipe 25 is agitated by the developer from the spray 27, and further agitated by the rotation of the brush rollers 15a and 15b. One end of the replenishment pipe 25 is connected to a replenisher tank 26 via a replenishment pump 36.

A printing plate mounting table 4 is arranged on the upstream side of the developing tank 1 in the printing plate conveying direction (on the left side in FIG. 1). At the end of the mounting table 4 on the tank body 1a side, a guide roller 5 for preventing the trailing edge of the printing plate from rising and a pair of conveying rollers 6 for conveying the printing plate from the mounting table 4 to the tank body 1a side. And are arranged. Although not shown, a sensor for detecting whether a printing plate is inserted and the area of the printing plate is provided on the mounting table 4 below the guide roller 5.

In the water washing tank 2 a of the post-treatment tank 3, a water spray 29, two pairs of conveying rollers 28 and 31 arranged with the water spray 29 interposed therebetween, and a spray function arranged below the water spray 29. A guide roller 30 is provided. Further, in the rinse treatment tank 2b, there are a rinse spray 33, a guide roller 32 for guiding the printing plate from the transport roller 31, and a pair of transport rollers 34 for discharging the rinsed printing plate to the outside. Are arranged.

The three pairs of transport rollers 28, 31, and 34 are arranged downward in the printing plate transport direction (rightward in FIG. 1). Further, the nip position of each pair of the transport rollers 28, 31, and 34 is arranged so as to be slightly inclined forward in the transport direction, whereby the transport roller 28 linearly extends from the transport roller 31 to the transport roller 34. Printing plates can be transported. Note that, in FIG. 1, arrows drawn from the water spray 29, the guide roller 30 with a spray function, and the rinse spray 33 respectively indicate the directions of jetting the cleaning water and the rinse liquid. As is clear from those arrows, the water spray 29 is arranged so as to eject toward the downstream side in the printing plate conveyance direction, thereby enhancing the effect of preventing backwash water from flowing backward.

Further, between the developing tank 1 and the washing tank 2a, once development, washing and rinsing treatments have been completed, and after that, adjustments such as dot etching have been applied. Therefore, only the washing and rinsing treatments are necessary. A bypass insertion port 24 for inserting the completed printing plate into the washing tank 2 is provided. Further, below the bypass insertion port 24, an overflow groove 23 is provided at a position adjacent to the transport roller 21, so that the level of the developing solution in the tank main body 1a is made constant. There is. A guide roller 22 is arranged above the overflow groove 23 and adjacent to the upper squeezing roller 21. Further, a floating lid 20 is floated on the developer in the tank body 1a. The floating lid 20 is for suppressing evaporation and oxidation of the developing solution.

The nip position of the transport roller 28 is arranged above the aperture roller 21. The line connecting the centers O ₁ and O ₂ of the pair of conveying rollers 28 is inclined to the downstream side in the printing plate conveying direction by an angle θ with respect to the vertical line A. Therefore, as shown in FIG. 3, the nip position N of the pair of conveying rollers 28 is arranged below the height T of the uppermost point of the lower conveying rollers 28.

Next, the operation of the above embodiment will be described. The printing plate is carried in from the mounting table 4 into the developing tank 1 in which the developing solution is stored. At this time, the printing plates are dipped in the image liquid in the tank body 1a by driving the conveying rollers 6 and 13. At this time, the brush rollers 15a and 15b rotate to rub the surface of the printing plate to accelerate the developing process. The printing plate that has undergone the development processing is carried into the post-processing tank 3 after the developing solution on the surface thereof has been squeezed by the pair of squeezing rollers 21 and 21.

In the post-treatment bath 3, first, the printing plate is sandwiched by the transport rollers 28 of the washing bath 2a as shown in FIG. At this time, immediately before the conveying direction of the conveying roller 28, the printing plate X bends so as to project upward. The nip position of the transport roller 28 is arranged above the aperture roller 21. Therefore, the printing plate X conveyed from the squeezing roller 21 to the conveying roller 28 is sandwiched between the conveying rollers 28 while being bent before the conveying roller 28 as shown in FIG. The line connecting the centers O1 and O2 of the pair of conveying rollers 28 is inclined to the downstream side in the printing plate conveying direction by an angle θ with respect to the vertical line A. Therefore, the nipping position N of the carrying roller 28 is arranged below the height T of the uppermost point of the lower carrying roller 28, as shown in FIG. As a result, even if the cleaning water adhering to the surface of the transport roller 28 collects between the transport rollers 28 as shown in FIG. 3 due to the rotation of the transport roller 28, it does not easily flow back to the developing tank 1 side. As a result, it is possible to prevent the wash water from flowing back to the developing tank 1 side from the washing tank 2 side along the printing plate X.

The printing plate X ejected from the transport roller 28 is washed with washing water from the water spray 29 and the guide roller 30. Then, the printing plate X is further transported into the rinse treatment tank 2b by the transport roller 31 and rinsed with the rinse liquid from the rinse spray 33. The printing plate X that has been rinsed is discharged to the outside by the transport roller 34.

When the printing plate that has already undergone the development process is washed again with water, the printing plate X is inserted from the bypass insertion port 24 and passed through the washing tank 2a and the rinse processing tank 2b. At this time, as shown in FIG. 2, since the conveying roller 28 is inclined forward by the angle θ, the inserting direction of the printing plate X is inclined as indicated by arrow B. As a result, the printing plate X can be easily inserted from the bypass insertion port 24. Further, since the printing plate X is transported obliquely downward by the transport roller 28, the rear end of the printing plate X is unlikely to contact the squeeze roller 21 and the guide roller 22, and the developer is unlikely to adhere to the back surface of the printing plate. .. Therefore, no problems will occur even if the printing plate is used for printing on both the front and back sides.

[0020]

[Effect of the device]

 The post-development processing device according to the present invention is provided with the inclined roller pair so as to receive the printing plate and convey it obliquely downward. It does not move and backflow of the processing liquid from the post-development processing device can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of an automatic developing device in which an embodiment of the present invention is adopted.

FIG. 2 is an enlarged schematic view of a conveyance roller in the water washing tank.

FIG. 3 is an enlarged partial view of the transport roller.

[Explanation of symbols]

 1 Development tank 2a Water washing tank 3 Post-treatment tank 28 Conveying roller 29 Water spray

Claims (1)

[Scope of utility model registration request] 1. A post-development processing device for post-developing a photosensitive lithographic printing plate after development, comprising a pair of rollers inclined so as to receive the photosensitive lithographic printing plate and convey it obliquely downward, A post-development processing apparatus comprising: a processing liquid supply unit that supplies a processing liquid to the photosensitive lithographic printing plate on the downstream side in the transport direction of the photosensitive lithographic printing plate.