JP3356065B2 - Wet development equipment for plate making machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate making machine for producing a printing master, and more particularly to a wet developing device for a plate making machine for developing a latent image of a document image.

[0002]

2. Description of the Related Art As is well known, a conventional wet developing apparatus of a plate making machine for producing a printing master has a structure as shown in FIGS. That is, the developing solution is sprayed from the spray nozzle D onto the master paper X taken into the wet developing device B by the rotation of the developing unit entrance roller A while passing through the developing unit electrode C, and the electrostatic force on the surface of the master paper X is reduced. Although the latent image is developed, the excess developer on the surface of the master paper X is squeezed when passing through the squeezing roller E.

The wet developing apparatus B has a collecting tank F for collecting the developer dropped from the inclined developing section electrode C and the squeezing roller E, and an auxiliary tank G connected to one end of the collecting tank F. The developer collected in the collection tank F is recirculated by the developer pump H provided in the above. That is, in order to facilitate maintenance, the recovery tank F and the auxiliary tank G are supported by the body frame by the support / guide rails I ₁ and I ₂ so as to be able to be pulled out in a direction perpendicular to the plane of FIG. . Of course, the liquid level of the developer in the recovery tank F is maintained at a substantially constant state by adjusting means such as a float valve (not shown).

[0004]

Therefore, according to such a structure, the developing solution dropped from the developing electrode C and the squeezing roller E jumps on the surface of the developing solution in the collecting tank F and scatters around. Peripheral devices are soiled. That is, as shown in the drawing, the developing solution dropped from the developing unit electrode C and the squeezing roller E is dropped into the collecting tank F from the vicinity of the squeezing roller E, and the amount of the developing solution dropped as shown in FIG. , Recovery tank F
The number is larger at both end portions of the squeezing roller E corresponding to the peripheral portion of. For this reason, when the developer dropped from both ends of the squeezing roller E falls on the liquid surface in the peripheral portion of the recovery tank F, it jumps up at the same liquid level and scatters as a droplet to the outside of the recovery tank F, and the peripheral devices are developed. They are contaminated with liquid and must be cleaned quite frequently.

When the wet developing device B is maintained, the recovery tank F is supported along the supporting and guiding rails I ₁ and I _2.
And the auxiliary tank G may be quickly pulled out of the machine frame. However, when such a rapid withdrawal operation is performed, the developer inside the recovery tank F and the auxiliary tank G is moved in the direction opposite to the acceleration. In other words, the developer may move inside the recovery tank F, get over the opening of the recovery tank F and flow out to the outside, and similarly, the peripheral equipment may be contaminated with the overflowing developer.

SUMMARY OF THE INVENTION In view of the above-described problems of the conventional wet developing apparatus of a plate making machine, the object of the present invention is to prevent the developing solution dropped from the developing unit electrode and the squeezing roller from being scattered as surroundings. An object of the present invention is to provide a wet developing device of a plate making machine in which the contained developer does not overflow to the surroundings even when the recovery tank is rapidly moved from the outside.

[0007]

According to the present invention, a developing solution is sprayed on a latent image forming master sheet passing through a developing section electrode, and excess developing solution of the master sheet is squeezed by a squeezing roller. , in the wet developing device plate making machine for collecting the developer was dropped to position the collection tank below the developing unit electrode and the squeeze roller, the developing unit electrode and the diaphragm
The upper surface located immediately below the recovery roller is
Higher porous block is located in the recovery tank,
The same amount of developer dropped from the developing unit electrode and the squeezing roller
Wet development of a plate making machine that receives and absorbs on the upper surface of the porous block and also contains the developer in the recovery tank in the same porous block to prevent rapid movement of the developer when a sudden acceleration is applied to the recovery tank. A device is proposed.

In the following description of a preferred embodiment of the present invention, 1) the porous block is formed of urethane foam or sponge rubber, and 2) the porous block is a frame-shaped porous body having a space formed therein. Structures that are quality blocks are described.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. 1 to 3 show a plate making machine to which a wet developing apparatus according to a first embodiment of the present invention has been applied,
A master paper supply device in which a master paper X wound in a roll shape is loaded on a core Y is located at an upper portion of the machine body 1, and a leading end of the master paper X is fed out by a predetermined length by a paper feed roller 2. Is cut by the cutter 3.

[0010] The cut master paper X is charged by the charging device 5 by the rotational motion of the conveying roller 4 for removing the curl.
And is supplied to an exposure stage 6 having an endless feed belt 6a, and is temporarily stopped on the surface of the exposure stage 6. That is, a document table device 7 on which a document Z is set is positioned beside the exposure stage 6.
The original Z can be set in a state where the original Z is pulled out of the body 1 in a direction perpendicular to the paper surface of FIG. The image of the original Z on the original platen device 7 is taken into the taking lens 9 via the reflecting mirror 8,
An image is formed on the master paper X on the surface of the exposure stage 6 by the photographing lens 9.

The master paper X that has been exposed to the original image is
The wet developing device 1 of the present invention below the platen device 7
The developer is sprayed on the photosensitive surface in the developing device 10, and the latent image is developed while passing through the developing unit electrode 10a. The developed master paper X is heated and dried while passing through the heating plate 11a and the drying plate 11b of the fixing device 11 subsequent to the developing device 10, and after the toner image is fixed, is provided on the left side of the machine body 1. The paper is discharged to the paper discharge tray 12.

FIGS. 2 and 3 show the above-mentioned wet developing apparatus 10.
The surface of the master paper X taken into the wet developing device 10 by the rotation of the developing unit entrance roller 10b is sprayed with the spray nozzle 1 while passing through the developing unit electrode 10a.
The developer is sprayed from 0c. At the exit end of the developing unit electrode 10a that is slightly inclined with respect to the horizontal plane, a squeezing roller 10d that is driven to rotate in the direction of the arrow is located, and excess developing solution that has adhered to the surface of the master paper X by the squeezing roller 10d is located. A collecting tank 1 is provided below the developing unit electrode 10a and the squeezing roller 10d to collect the surplus developing solution dropped from the developing unit electrode 10a and the squeezing roller 10d.
3 are arranged.

The developer recovered in the recovery tank 13 is recirculated by a developer pump 15 provided in an auxiliary tank 14 connected to one end of the recovery tank 13. These recovery tanks 1
3 and the auxiliary tank 14 are provided to facilitate maintenance.
Support / guide rails 16A provided between the body frame and
16B can be pulled out in a direction perpendicular to the paper surface of FIG. Although not shown, the liquid level of the developer in the recovery tank 13 is maintained substantially constant by adjusting means such as a float valve, which is not shown, as in the prior art.

According to the present invention, the developing solution inside the recovery tank 13 and the auxiliary tank 14 whose upper part is opened toward the developing part electrode 10a and the squeezing roller 10d contains:
For example, the first porous block 17 and the second porous block 18 made of a water-containing material such as flexible urethane foam or sponge rubber are immersed. That is, the first porous block 17 and the second porous block 18 have a thickness W which is sufficiently larger than the liquid level L of the developing solution inside both the developing unit electrode 10a and the squeezing roller 10d. An electrode having approximately the same area as these is used so as not to move in the developing unit electrode 10a and the squeezing roller 10d. As a result, the upper surfaces 17a and 18a of the first porous block 17 and the second porous block 18 are located on the liquid level of the developing solution inside the corresponding developing unit electrode 10a and the squeezing roller 10d. The developer 17a, 18a dropped on the upper surface is received.

Since the wet developing device of the plate making machine according to the first embodiment has the structure described above, the developing unit electrode 1
0a and the developing solution from the squeezing roller 10d are collected by dropping into the collecting tank 13, but the dropped developing solution hits the flexible porous surface of the first porous block 17,
The shape of the droplet is distorted on the uneven upper surface 17a, the formation of the droplet is suppressed, and the droplet is naturally absorbed into the first porous block 17. For this reason, it is possible to prevent the developing solution flowing down from the developing unit electrode 10a and the squeezing roller 10d from jumping up on the level of the developing solution in the recovery tank 13 and contaminating peripheral devices with the scattered droplets.

Also, for maintenance and the like, the collection tank 1
When the developer 3 and the auxiliary tank 14 are drawn out along the body frame, even if the internal developer attempts to move in the opposite direction to the applied acceleration, the developer remains in the recovery tank 13 and the auxiliary tank 14.
First porous block 17 and second porous block 1 inside
8 and it is difficult to flow quickly, so that overflow from the ends of the recovery tank 13 and the auxiliary tank 14 is prevented. Thus, the first porous block 17 and the second porous block 18 which can be manufactured at low cost are collected in the collecting tank 13.
And squeezing roller 10d simply by placing it in auxiliary tank 14.
It is possible to prevent the developer from overflowing due to the scattering of the developer flowing down from the device or the rapid movement of the recovery tank 13 or the like, thereby preventing the developer from being contaminated by the peripheral device.

A wet developing apparatus 1 according to a second embodiment of the present invention.
FIG. 4 showing 0 is a sectional view corresponding to FIG. 3 described above, and the same components as those in FIG. 3 are denoted by the same reference numerals.
The feature of the wet developing apparatus 10 according to the second embodiment is that the frame-shaped porous block 17 used in place of the first porous block 17 is used.
A, like the first porous block 17, the frame-shaped porous block 17A is also made of a water-containing material such as flexible urethane foam or sponge rubber. That is, the outer dimensions and thickness of the frame-shaped porous block 17A are the first dimensions.
It is the same as the porous block 17, and a large open space 19 is formed at the center thereof. Therefore,
With the frame-shaped porous block 17A having such a structure, it is possible to receive the developing solution from the squeezing roller 10d and the like on the upper surface 17a of the frame-shaped porous block 17A, suppress the scattering thereof, and rapidly reduce the speed of the collection tank 13 and the like. It can correspond to movement.

[0018]

As is clear from the above description, according to the present invention, only the porous block which can be manufactured at low cost is located inside the recovery tank, and the developer scattered in the recovery tank is prevented from being scattered. At the same time, the overflow of the developer during the operation of rapidly moving the recovery tank can be prevented.

[Brief description of the drawings]

FIG. 1 is an overall sectional view of a plate making machine provided with a wet developing device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the wet developing device.

FIG. 3 is a sectional view of the wet developing device, taken along line 3-3 in FIG. 2;

FIG. 4 shows a wet developing apparatus according to a second embodiment of the present invention;
It is an equivalent sectional view.

FIG. 5 is a sectional view of a conventional wet developing device.

6 is a cross-sectional view of the wet developing device taken along line 6-6 in FIG.

[Explanation of symbols]

 X Master paper 10 Wet developing device 10a Developing unit electrode 10b Developing unit entrance roller 10c Spray nozzle 10d Squeeze roller 13 Recovery tank 14 Auxiliary tank 15 Developer pump 16A, 16B Support / guide rail 17 First porous block 17A Frame porous block

Continuation of front page (56) References JP-A-4-123077 (JP, A) JP-A-10-254246 (JP, A) JP-A-5-241431 (JP, A) Jpn. , U) Jpn. Sho 62-170962 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03G 15/10-15/11 G03G 13/26

Claims (3)

(57) [Claims] 1. A developer is sprayed on a latent image forming master sheet passing through a developing section electrode, and excess developing solution of the master sheet is squeezed by a squeezing roller. A collection tank is provided below the developing section electrode and the squeezing roller. In a wet developing device of a plate making machine for recovering a developer dropped and positioned, the developing unit electrode and the throttle
The upper surface located immediately below the recovery roller is
Higher porous block is located in the recovery tank,
The same amount of developer dropped from the developing unit electrode and the squeezing roller
The top surface of the porous block absorbs and absorbs the developer, and the developer in the recovery tank is included in the porous block to prevent rapid movement of the developer when a sudden acceleration acts on the recovery tank. Wet developing device for plate making machine. 2. The wet developing device of a plate making machine according to claim 1, wherein said porous block is made of foamed urethane or sponge rubber. 3. The wet developing apparatus for a plate making machine according to claim 1, wherein said porous block is a frame-shaped porous block having a space formed therein.