JPH07281450A - Printing plate processor - Google Patents

Abstract

PURPOSE:To provide the compact processor in which the phenomenon of activity reduction or deactivation of the developer due to the prerinsing solution, that is associated with the miniaturization of the immersion developing type printing plate processor, can be inhibited from occurring and with which a reduction in the required installation space can be attained. CONSTITUTION:This processor has three tanks, namely the developing tank 21, the prerinsing tank 31 and the finisher tank 41 and also is provided with the pair of delivery/carrying rollers 24 for upwardly leading a printing plate carried into the developing tank 21 and the pair of receiving/carrying rollers 33 that is disposed at the inlet of the prerinsing tank 31 and used for introducing the printing plate led by the pair of rollers 24 into the prerinsing tank 31. In this processor, the front end of the printing plate is brought into contact with the pair of rollers 33 at the position of a part of the upper roller surface located in the region above the liquid accumulation region where both the upper and lower rollers of the pair of rollers 33 are allowed to contact with and to press on each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing plate processing apparatus for developing a printing plate (a planographic plate for printing, specifically a PS plate, etc.), and more specifically, a method for reducing the developer in a developing tank. For improvement to prevent power.

[0002]

2. Description of the Related Art In a printing apparatus, a developing tank, a pre-rinse tank, and a finisher tank are arranged, and a printing plate is developed while being conveyed in each tank in this order.

In many cases, the printing plate in each tank is processed while taking a spray shower, but recently, the shower in the developing tank is a dip of a liquid immersion type because it hinders the acceleration of oxidation due to the scattering of the developing solution. Development is becoming mainstream.

[0004]

However, there is a strong demand in the industry to make the developing tank a liquid immersion type and to make it as compact as possible to reduce the installation area.

In order to respond to this, the depth of the developing tank is increased and the conveying angle of the printing plate before and after the liquid immersion is set higher. This can considerably shorten the length of the developing tank.

However, in this case, since the inclination angle of the printing plate conveyed to the pre-rinse tank after the development is large, the pre-rinse solution spray-shown in the pre-rinse tank is 33A of the conveying roller pair 33 as shown in FIG. , 33B may form a liquid pool 301 at the upper and lower roller contact portions, which may flow along the upper surface of the printing plate and flow into the developing tank. As a result, the developing solution is depleted early and sunk.

The present invention eliminates such development and adopts a deeper developing tank to miniaturize the processing apparatus, thereby providing a printing plate processing apparatus in which the developing solution is not depleted. The purpose is to do.

[0008]

This object is achieved by any of the following technical means a, b, c and d.

(A) At least a developing tank, a pre-rinsing tank,
It has three tanks, a finisher tank, and a delivery / conveyance roller pair for guiding the printing plate conveyed into the developing tank upward, and a delivery / conveyance roller pair arranged at the inlet of the pre-rinsing tank. A printing plate processing device provided with a pair of receiving and conveying rollers for taking a printing plate into the pre-rinsing tank, wherein the contact position of the tip of the printing plate to the receiving and conveying roller pair is both upper and lower rollers of the receiving and conveying roller pair. A printing plate processing apparatus, which is an upper roller surface which is an area above a liquid pool area which is in contact with each other and pressed against each other.

(B) The printing plate processing apparatus according to item (a), wherein the contact position of the leading edge of the printing plate is determined by the positional relationship between the delivery / conveying roller pair and the receiving / conveying roller pair.

In addition to item (c) b, the contact position of the leading edge of the printing plate is regulated by a guide plate provided in the vicinity of the upper roller of the delivery / conveying roller pair. .

(D) A printing plate according to item c, characterized in that a guide roller is provided on the side of the guide plate facing the printing plate so that the printing plate comes into direct contact with the guide roller. Processing equipment.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described together with its operation with reference to the drawings.

FIG. 1 is a schematic view showing the whole printing plate processing apparatus of the present invention. Reference numeral 10 is a supply unit for a printing plate P, which is composed of a supply base 11 and upper and lower rollers 12A and 12B of a feed roller pair 12, and 20 is a developing unit for a developing tank 21 and two pairs of conveying roller pairs provided therein. Among them, the upper and lower rollers 23A and 23B of the conveying roller pair 23 on the inlet side and the upper and lower rollers 24A and 24B of the delivery and conveying roller pair 24 to the next tank are used to convey the printing plate P by immersion in the tank. is there. Reference numeral 30 denotes a pre-rinse portion, which is a pair of upper and lower rollers 24 of the delivery / conveyance roller pair 24 from the developing portion 20.
This is a tank in which the printing plate P carried out by A and 24B is washed with the pre-rinse liquid. That is, the pre-rinse tank 31 has both upper and lower rollers 33A of the receiving and conveying roller pair 33 provided at the inlet,
33B and the pair of upper and lower rollers 34A of the conveying roller pair 34 on the exit side,
34B and a pre-rinse liquid spray nozzle provided in between
Of the upper and lower rollers 33A and 33B of the pair of receiving and conveying rollers 33 at the entrance, the upper roller 33B is touched by the squeeze roller 37 so that the sprayed pre-rinse liquid does not come out. 40 is a finisher part, and the pre-rinse part 30 is provided in the finisher tank 41.
There are provided two pairs of conveying rollers for conveying the printing plate P conveyed from the above and a spray nozzle for spraying the rinse liquid.

The printing plate P finished in this way while being transported through the respective tanks is finally sent to the drying section 50,
It is dried and collected.

Here, in the pre-rinse section 30, the upper roller 33B of the receiving and conveying roller pair 33 provided above the pre-rinse tank 31.
On the inlet side of the pressing portion of the lower roller 33A, a liquid pool 301 is formed as shown in the partial view of FIG. This is sprayed with pre-rinse liquid from spray nozzles 35 and 36,
Droplets 302 and 303 are formed on 33A and 33B, and both rollers 33
The rotation of A and 33B forms a pool of 301.

The upper roller 33B has a squeeze roller 37.
Since it touches, the liquid pool 301 will not be generated and grow beyond it, but the lower roller
It is considered that the droplet 303 formed on the lower part of 33A forms the liquid pool 301 relatively stably by the rotation of the lower roller 33A.

When the leading edge of the printing plate P, which is conveyed by being inclined in the transfer roller pair 23 of the developing tank 21, enters the receiving roller pair 33 of the pre-rinsing tank 31, as shown in FIG. As shown in a), when the tip end hits the roller surface of the upper roller 33B above the liquid pool and then enters between the upper roller 33B and the lower roller 33A while touching the roller surface, the liquid pool As shown in FIG. 3 (b), 301 enters the lower side of the printing plate P, but is transformed into droplets 301 </ b> A together with the lower roller 33 </ b> A while being entrained and returned to the center of the pre-rinsing tank to go to the printing plate P. It was found that it did not mix with the developer in the developing tank 21 through the lower surface of the.

However, when the front end of the printing plate P is fed and touches the roller surface of the upper roller 33B, the liquid pool 30
When entering the area of 1, the at least a part of the liquid pool 301 quickly flows down along the upper surface of the printing plate P, mixes with the developing solution in the developing tank 21, and the developing solution is temporarily reduced. Will end up.

Therefore, the main part of the configuration of the present invention is to set the path so that the printing plate P is conveyed so that the droplet 301 is always on the lower side of the printing plate P to be conveyed. Yes, and it is what is shown in claim 1.

According to the second embodiment, as shown in FIG. 4, it is received by the delivery roller pair 24 that the leading end portion of the printing plate P always starts contact with the upper side of the droplet forming area of the upper roller 33B. This is made possible by the arrangement of the rollers 24A, 24B, 33A, 33B of the roller pair 33, and is useful when the bending properties of the printing plate do not change significantly.

In the third embodiment, as shown in FIG. 5, a guide plate 38A is provided to further secure the embodiment of the second embodiment, and the physical properties of the printing plate with respect to bending are slightly changed. Even then, it will be more stable.

Further, in the embodiment of claim 4, as shown in FIG. 6, the guide plate 38A of the embodiment of claim 3 is provided with the guide roller 38B, whereby the printing plate P and the guide plate 38A come into contact with each other. In this way, there is no need to worry about scratching the printing plate P.

Here, the guide plate 38A has a center of rotation on the left side of the drawing, and the right side of the drawing is elastically biased upward so that the printing plate is set to the upper roller of the roller pair 33. After contacting 33B, it may be balanced so that the right side is lowered.

[0025]

According to the present invention, when the printing plate is conveyed from the developing tank to the pre-rinsing tank at a considerable inclination angle, the pre-rinsing liquid flows through the printing plate into the developing tank to reduce the developing solution. The phenomenon of being lost has been resolved. As a result, it is possible to stably provide a rational printing plate processing apparatus that is compact and saves the layout area.

[Brief description of drawings]

FIG. 1 is an overall schematic diagram of a printing plate processing apparatus of the present invention.

FIG. 2 is a configuration diagram of a pool of pre-rinse liquid generated in a pair of receiving and conveying rollers.

FIG. 3 is a layout diagram showing the behavior of a liquid pool of a pair of receiving and conveying rollers and a printing plate.

FIG. 4 is a layout diagram showing a positional relationship between a delivery conveyance roller pair and a reception conveyance roller pair with respect to a printing plate.

5 is a layout drawing in which a guide plate is added to FIG.

FIG. 6 is a layout diagram in which a guide roller is added to FIG.

[Explanation of symbols]

 20 developing section 21 developing tank 24 delivery / conveying roller pair 24A lower roller 24B upper roller 30 pre-rinsing section 31 pre-rinsing tank 33 receiving / conveying roller pair 33A lower roller 33B upper roller 35,36 spray nozzle 37 squeeze roller 38A guide plate 38B guide roller 301 liquid Pool

Claims (4)

[Claims] 1. A delivery and conveyance roller pair which has at least three tanks of a developing tank, a pre-rinse tank, and a finisher tank, and which guides a printing plate conveyed in the developing tank upward, and an inlet portion in the pre-rinse tank. A printing plate processing apparatus provided with a receiving and conveying roller pair that is arranged and takes in the printing plate guided by the delivering and conveying roller pair into the pre-rinsing tank, wherein the printing plate leading end contacts the receiving and conveying roller pair. A printing plate processing apparatus, wherein the position is an upper roller surface which is an area above a liquid pool area in which the upper and lower rollers of the pair of receiving and conveying rollers contact and press each other. 2. The printing plate processing apparatus according to claim 1, wherein the contact position of the leading edge of the printing plate is determined by the positional relationship between the pair of delivery / conveyance rollers and the pair of reception / conveyance rollers. 3. The printing plate processing apparatus according to claim 2, wherein the contact position of the leading edge of the printing plate is regulated by a guide plate provided in the vicinity of the upper roller of the delivery and conveyance roller pair. . 4. A guide roller is provided on the opposite side of the guide plate to the printing plate, and the printing plate is in direct contact with the guide roller.
The printing plate processing apparatus described in 1.