JPH04158367A - Planographic plate developing device - Google Patents

Abstract

PURPOSE:To facilitate the draining work of a dipping pad and prevent the precipitation of sludge at the bottom section of a dipping pad by providing the tiltable roller dipping pad below a lower squeeze roller. CONSTITUTION:When a developing device is stopped after the development processing is completed, a lever 27 is set in the left direction, and a slide metal 24 is moved to the right accordingly. The nearly triangular notch section 24a of the metal 24 is removed from the center shaft of an upper developing squeeze roller 5a. The roller 5a is lifted up, and the upper and lower rollers 5a, 5b are separated. A pressing pin 29 is removed from the lower section of a pad 28 as the metal 24 is moved to the right. The pad 28 is tilted downward by the exciting force of a spring 30, and a processing solution is discharged. The rollers 5a, 5b are lifted up and the processing solution in the pad 28 is discharged concurrently by the operation of the lever 27.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an improvement of a roller dipping vat of a lithographic printing plate developing device for developing a lithographic printing plate.

<Background of the Invention> Since a lithographic printing plate is composed of an aluminum support and has a certain degree of rigidity, development is generally performed by applying or spraying a processing solution while transporting the plate in a horizontal state.

FIG. 9 is a block diagram showing the schematic structure of a conventional developing device. The lithographic printing plate 1, on which a film image has been exposed using a metal halide lamp (not shown), is developed by developing rollers 2a and 2b.
drawn in. Then, a swelling developer is sprayed by the developing nozzles 3a and 3b. As a result, the lithographic printing plate 1
The photosensitive resin layer in the non-image area swells or dissolves. and,
The rotation of the brush roller 4 peels off or promotes dissolution of the swollen photosensitive resin layer. After this, the developing squeeze roller 5a,
Squeeze with 5b.

Thereafter, it is drawn into the washing section by the washing inlet rollers lla and llb. Then, water for washing is sprayed from the washing shower nozzle 12. And the water washing squeeze roller 13a,
Squeeze with 13b.

Next, it is drawn into the gum processing section by the gum processing entrance rollers 16a and 16b, and the gum solution is sprayed from the gum solution shower nozzle 17. And gum processing squeeze rollers 18a, 18
Squeeze with b.

In such a developing device, a roller cleaning mechanism for cleaning the rollers may be provided.

As shown in FIG. 10, the lower part of the developing squeeze roller 5b is immersed in a roller immersion tank 22 filled with water for the purpose of preventing the roller from drying out and preventing dirt from adhering to the roller surface. .

<Problems to be Solved by the Invention> The above-mentioned immersion tank 22 is a processing tank in which a part of the tank is partitioned, and the lower part of the roller that requires immersion is immersed in the processing liquid. With such a structure of the immersion tank, the liquid in the immersion tank 22 must be drained after the development operation is completed.

For this work, it is necessary to operate a drain cock (not shown) provided at the bottom of the immersion tank 22.

There is also a method in which a removable dipping vat 23 is provided as shown in FIG. In this case, roller 5a.

At the same time as removing 5b, remove the dipping bat 23,
Drain the liquid.

However, either method has the problem that the burden of daily work is large. And immersion tank 22.
This method has a disadvantage in that precipitates such as sludge generated from the processing liquid tend to accumulate at the bottom of the dipping vat 23.

The present invention has been made to solve the above-mentioned problems, and its purpose is to facilitate the draining operation of a dipping vat, and to
The object of the present invention is to realize a lithographic printing plate developing device that can prevent sludge precipitation at the bottom of the immersion hunt.

<Means for Solving the Problems> The present invention, which solves the above-mentioned problems, is a planographic printing plate developing device equipped with squeeze rollers that sandwich a planographic printing plate from above and below, in which a tiltable roller dipping is provided at the bottom of the lower squeeze roller. It has a bat.

<Function> In the lithographic printing plate developing device of the present invention, a tiltable dipping vat is disposed below the lower squeeze roller.

In certain cases, the dipping vat is tilted and the processing liquid in the dipping vat is drained.

<Examples> Examples of the present invention will be described in detail below with reference to the drawings.

FIGS. 1 and 2 are block diagrams showing a schematic structure of an embodiment of the present invention. Note that the same numbers are given to those already explained in FIG. 9.

In these figures, 4 is a brush roller, 5a and 5b
is a squeeze roller. Note that the squeeze roller 5a can be lifted up when not in use. 24
25a, 25b, 25c are pins provided on the slide fitting 24, and 26 are pins 25a to 25c.
26a is the central axis of the gear, 27 is a lever that rotates the gear 26 around the central axis 26a, 2
Reference numeral 8 denotes a tiltable vat for dipping the processing liquid into the lower part of the lower squeeze roller 5b, 29 is a presser pin provided on one piece of the slide fitting and supports the vat 28 from below, and 30 is a spring for tilting the vat 28.

The operation of the apparatus of this embodiment configured as described above is as follows.

When the developing device is in use, the lever 27 is set to the right (as shown in FIG. 1), and the slide fitting 24 is moved to the left accordingly. At this time, the center axis of the developing squeeze roller 5a is inserted into the substantially triangular notch 24a of the slide fitting 24. In addition, the slide fitting 24
The holding pin 29 presses the lower part of the bat 28 as the bat 28 is moved to the left. Therefore, the vat 28 remains horizontal, and the lower developing squeeze roller 5b is immersed in the processing liquid. In this state, the swollen photosensitive resin layer of the planographic printing plate 1 is transferred to the brush roller 4.
scraped off by The developing squeeze rollers 5a are in contact with each other.

Squeezed by 5b.

When the developing process is completed and the developing device is stopped, the lever 27 is set to the left (the state shown in FIG. 2), and the slide fitting 24 is moved to the right accordingly. At this time, the approximately triangular notch 24a of the slide fitting 24
is off the center axis of the developing squeeze roller 5a. Therefore, the upper developing squeeze roller 5a is lifted up,
Parent statue squeeze Laura leaves. In addition, slide fitting 2
4 is moved to the right, the presser fin 29 comes off from the lower part of the bat 28. Therefore, the hat 28 is tilted downward by the biasing force of the spring 30, and the processing liquid is discharged.

Therefore, by operating the lever 27, lifting up of the developing squeeze rollers 5a and 5b and discharging the processing liquid in the vat 28 are performed simultaneously. Therefore, there is no need for any troublesome operation for discharging the processing liquid.

Incidentally, before starting the next operation, the processing liquid is supplied manually or automatically while the lever 27 is operated to the right to set the vat 28 in a horizontal state.

Furthermore, providing a dipping vat below the development entrance roller 2b is also effective in preventing uneven development.

FIGS. 3 and 4 are block diagrams showing the schematic structure of a second embodiment of the present invention.

In these figures, 16a and 16b are gum processing inlet rollers, 17 is a gum solution shower nostle for dispersing gum solution, 18a and 18b are gum processing squeeze rollers for squeezing, and 24 is held by a holding part (not shown), and the right and left sides are Slide brackets that can be moved to, 25'a, 25b, 25
c is a pin provided on the slide fitting 24, 26 is pin 2
Gears meshed with 5a to 25c, 26a the central axis of the gear, 27 a lever that rotates the gear 26 around the central axis 26a, and 30 a tilting mechanism that immerses the processing liquid into the lower part of the lower gum processing squeeze roller 5b. 31 is a holding pin provided on one piece of the slide fitting to support the bat 30 from below, and 32 is a spring for tilting the bat 30.

The operation of the apparatus of this embodiment configured as described above is as follows.

When the developing device is in use, the lever 27 is set to the right (the state shown in FIG. 3), and the slide fitting 24 is moved to the left accordingly. At this time, the central axes of the gum processing artificial roller 16a and the gum processing squeeze roller 18a are inserted into the approximately triangular notches 24b and 24c of the slide fitting 24. Further, as the slide fitting 24 is moved to the left, the holding pin 31 is adapted to press the lower part of the butt 3°. Therefore, the vat 30 remains in a horizontal state, and the gum liquid immerses the lower gum processing squeeze roller 18b.

In this state, the surface of the lithographic printing plate 1 is coated with the gum liquid sprayed from the gum treatment shower nozzle 17. The gum processing squeeze rollers 18a are in contact with each other.
, 18b. Further, at this time, since the gum liquid immerses the gum treatment squeeze roller 18b on the lower side, it is possible to prevent the gum treatment squeeze roller 18b from drying out.

Then, when the gum processing is completed and the device is stopped,
The lever 27 is operated to the left (the state shown in FIG. 4), and the slide fitting 24 is moved to the right in response. At this time, the approximately triangular notches 24b, 24 of the slide fitting 24
c is off from the center axis of the squeeze roller 5a. Therefore, the gum processing entrance roller 16a and the gum processing squeeze roller 18a are lifted up, and the respective rollers that were in close contact with each other are separated. Further, as the slide fitting 24 is moved to the right, the holding pin 29 is removed from the lower part of the bat 28. Therefore, the bat 28 is tilted downward by the biasing force of the spring 32, and the gum liquid is discharged. This can prevent the gum liquid from solidifying within the vat.

Therefore, by operating the lever 27, the squeeze roller 5a
, 5b are lifted up and the processing liquid in the vat 30 is discharged at the same time. Therefore, a troublesome operation for discharging the processing liquid becomes unnecessary.

Incidentally, when the mechanisms shown in FIGS. 1 and 2 and the mechanisms shown in FIGS. 3 and 4 are installed together, this is achieved by integrating the slide fittings 24.

By the way, in conventional gum processing, it has been common to shower not only the gum processing entrance roller 16g but also the gum processing squeeze roller 18a. However, when squeezing by the opposing rollers 18a and 18b, the fifth
As shown in the figure, the processing liquid flows around at both the left and right ends of the roller.

Therefore, by showering the gum liquid only on the gum processing artificial roller 16a as in this embodiment, it is possible to minimize the wraparound of the rollers from side to side, and to suppress squeezing defects as shown in FIG. can.

Incidentally, as shown in FIG. 7, it is also possible to configure the bat 28 so that it can be tilted in the axial direction. Furthermore, as shown in FIG. 8, the same effect can be obtained even if the bat 28 is rotated after being lowered once.

<Effects of the Invention> As described above in detail, in the developing device of the present invention, in the lithographic printing plate developing device equipped with squeeze rollers that sandwich the lithographic printing plate from above and below, a tiltable roller is provided at the bottom of the lower squeeze roller. It was configured to have a dipping vat.

As a result, the dipping vat is tilted in a predetermined case, and the processing liquid in the dipping vat is discharged.

Therefore, it is possible to realize a lithographic printing plate developing apparatus that facilitates the draining operation of the dipping vat and prevents sludge from settling at the bottom of the dipping vat.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the structure of a lithographic printing plate developing device according to an embodiment of the present invention; FIG. 2 is a block diagram showing another state of the lithographic printing plate developing device according to the embodiment shown in FIG. 1; FIG. 3 is a block diagram showing the configuration of a planographic printing plate developing device according to another embodiment of the present invention. FIG. 4 is a block diagram showing another state of the planographic printing plate developing device according to the embodiment shown in FIG. , FIG. 5 is an explanatory diagram showing how squeeze irregularities occur in the conventional device, FIG. 6 is an explanatory diagram showing how squeeze irregularities occur in the embodiment device shown in FIG. 3, and FIG. 7 is an explanatory diagram showing how squeeze irregularities occur in the embodiment device shown in FIG. Fig. 8 is a block diagram showing the structure of still another embodiment of the present invention;
- Figure 9 is a configuration diagram showing the entire conventional lithographic printing plate developing device; Figure 10 is an explanatory diagram showing the state of the immersion vat in the conventional device; Figure 11 shows another example of the immersion vat in the conventional device. It is an explanatory diagram. 1... Lithographic printing plate 4... Brush roller 5a
, 5b... Squeeze rollers 10a, 16b... Gum processing artificial roller 17... Gum processing shower nozzles 18a, 18b... Gum processing inlet ~24... Slide fittings 25a, 25b, 25cm... Pin 26...Gear 27...Lever 28...
・Bat 29... Holder pin 30... Spring 30... Bat 31... Holder pin 32
...spring

Claims (1)

[Scope of Claim] A lithographic printing plate developing device equipped with squeeze rollers that sandwich a lithographic printing plate from above and below, characterized in that it has a tiltable roller dipping vat below the lower squeeze roller. .