JPH09222714A - Processing solution filtering device for automatic developing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a processing solution filtering device capable of taking out a filter, ithout coming a hand in contact with a processing solution. SOLUTION: A cover 27 is screwed onto the top part of a filter case 23 into which the processing solution in a processing solution tank 20 is fed by the driving of a pump 22. An inner cover 29 provided in the rear part of the cover 27 is supported freely attachably to/detachably from the filter case 23. Plural plate pieces 36 are radially provided on the rear surface of the inner cover 29, and the top end part of a cylindrical filter 37 for filtering the processing solution is press-fitted to the outside of the plate pieces 36. Thus, the filter 37 is removed from the filter case 23 by the removal of the inner cover 29 to prevent the hand from coming into contact with the processing solution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing liquid filtering apparatus for an automatic developing machine for developing a photosensitive material such as a film or a printing paper.

[0002]

2. Description of the Related Art A plurality of processing solution tanks filled with various developing processing solutions such as a developing solution, a bleaching solution, a fixing solution and a stabilizing solution are arranged in the order of a developing process, and a photosensitive material is sequentially transferred into the processing solution tank. In an automatic developing machine that performs development processing by processing, a processing solution filtering device is provided for each processing solution tank to remove impurities such as dust contained in the processing solution.

As a treatment liquid filtering device, those shown in FIGS. 3 and 4 have been conventionally known. The filtration device shown in FIG. 3 is a circulation system in which the sub-tank 2 is communicated with the upper part of the treatment liquid tank 1 filled with the treatment liquid, and the treatment liquid outlet 3 formed in the bottom plate of the sub tank 2 is communicated with the lower portion of the treatment liquid tank 1. A pump 5 is installed in the passage 4, the processing liquid is circulated between the processing liquid tank 1 and the sub tank 2 by driving the pump 5, and impurities in the processing liquid are removed by a filter 6 incorporated in the sub tank 2. ing.

Further, the filter device shown in FIG. 4 includes a pump case 15 and a filter case 14 which is hermetically sealed by a detachable lid 13 in a circulation path 12 which connects a lower part and an upper part of a treatment liquid tank 11. The processing liquid in the processing liquid tank 11 is made to flow along the circulation path 12 by driving the pump 15, and the processing liquid sent into the filter case 14 is filtered by the filter 16 installed in the filter case 14. The filtered liquid that has passed through the filter 16 is returned to the processing liquid tank 11.

Here, in the filtering device shown in FIG.
The upper opening of the sub-tank 2 is closed by a cover 7 to prevent dust from entering. However, since the air layer is present between the liquid level of the processing liquid in the sub-tank 2 and the cover 7, the processing liquid is separated from the air. There is a problem that it is easily oxidized by the contact of

On the other hand, in the filtering device shown in FIG. 4, since the filter 16 is incorporated in the filter case 14 which is sealed by the attachment of the lid body 13,
There is almost no oxidation of the processing liquid flowing through the circulation path 12, and the function of the processing liquid can be maintained for a long period of time.

[0007]

By the way, in the filtering device in which the filter 16 is incorporated in the filter case 14, since the support for holding the filter 16 by mounting the lid 13 is provided, when cleaning or replacing the filter 16, The filter 16 in the filter case 14 needs to be grasped and taken out, and there is a risk that the processing liquid that infiltrates the filter 16 may come into contact with hands and cause sores.

An object of the present invention is to provide a treatment liquid filtering device which allows a treatment liquid to be taken out of a filter incorporated in a filter case without touching the treatment liquid with hands.

[0009]

In order to solve the above-mentioned problems, in the present invention, a circulation passage that connects the lower portion and the upper portion of the treatment liquid tank has a pump, and a treatment liquid outlet / inlet, By incorporating a filter case whose inside is sealed by attaching the lid, the processing liquid in the processing liquid tank sent into the filter case by driving the above-mentioned pump is filtered by the filter housed in the filter case and passed through the filter. In the processing liquid filtering device in the automatic developing machine adapted to return the processing liquid into the processing liquid tank, an inner lid which is held by a lid is detachably provided inside the filter case, and the filter is provided on the lower surface of the inner lid. The upper part of the is attached detachably.

As a means for detachably supporting the filter, it is possible to adopt a structure in which a plurality of plate pieces are radially provided on the lower surface of the inner lid and the plate pieces are press-fitted into the upper opening of the filter.

[0011]

As described above, since the filter is removably attached to the lower surface of the inner lid, the filter can be taken out from the filter case together with the removal of the inner lid, and the treatment liquid can be prevented from touching the hand. it can.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in the figure, a pump 22 and a filter case 23 on the discharge side of the pump 22 are incorporated in the circulation path 21 that connects the upper portion and the lower portion of the treatment liquid tank 20.

The filter case 23 has a processing liquid inlet 24 at the lower outer periphery and an outlet 25 at the center of the bottom. The inlet 24 communicates with the discharge side of the pump 22 and the outlet 25 communicates with the processing liquid tank 20. It is considered to be embedded.

A screw 2 is provided on the upper periphery of the filter case 23.
6 is provided, a lid 27 is screw-engaged with the screw 26, and the filter 27 is tightened by tightening the lid 27.
The inside of is sealed.

A fitting recess 28 is formed in the upper part of the inner periphery of the filter case 23, and an inner lid 29 is inserted into the fitting recess 28 so as to be freely inserted and removed. The inner lid 29 has a flange 30 supported on the upper end of the filter case 23, and a notch 31 formed on the flange 30 engages with a protrusion 32 provided on the upper end of the filter case 23. The lid 29 is prevented from rotating.

A recess 33 is formed on the upper surface of the inner lid 29, and radial ribs 34 are formed on the bottom surface of the recess 33.
The inner lid 29 can be held by gripping.

The inner lid 29 is pushed down by tightening the lid 27, and the seal ring 35 provided under the inner lid 29 is brought into close contact with the lower surface of the inner lid 29 and the bottom surface of the fitting recess 28 by the pushing down. Thus, the space between the inner lid 29 and the bottom surface of the fitting recess 28 is sealed.

Since the inner lid 29 is prevented from rotating, the seal ring 35 is distorted when the lid 27 is tightened,
It can prevent damage.

A plurality of plate pieces 36 are radially provided on the lower surface of the inner lid 29, and an upper portion of a cylindrical filter 37 is detachably supported on the plate pieces 36 by means of press fitting.
Here, the filter 37 includes a cylindrical porous core 38 made of synthetic resin and a filter element 39 provided on the outer side thereof, and the filter element 39 may be formed of, for example, fibers. .

When the inner lid 29 is attached to the filter case 23, the lower end of the filter 37 is brought into close contact with the upper surface of the bottom plate of the filter case 23, and the lower end opening of the porous core 38 covers the outlet 25. The filter 37
By mounting the processing liquid, a processing liquid supply space 40 is formed between the filter 37 and the inner peripheral surface of the filter case 23.

Now, when the pump 22 is driven, the processing liquid in the processing liquid tank 20 is pressure-fed from the circulation path 21 into the processing liquid supply space 40 formed in the filter case 23,
After being filtered by the filter 37, impurities in the treatment liquid are removed.

The filtered processing liquid that has passed through the inside of the filter 37 is returned from the outlet 25 to the inside of the processing liquid tank 20.

Here, in order to smoothly circulate the processing liquid between the processing liquid tank 20 and the filter case 23, the filter case 23 is provided with an air vent passage 41 communicating with the inside of the processing liquid tank 20. The air inside is exhausted from the air vent passage 41 into the processing liquid tank 20.

When the above-mentioned treatment liquid is filtered for a long period of time, the filter 37 is clogged and the filtration efficiency is lowered. For this reason, the filter 37 is taken out from the filter case 23 and cleaned periodically or when it becomes heavily soiled, and sometimes replaced with a new one.

When removing the filter 37, the lid 27 is removed and the inner lid 29 is pulled up from the inside of the filter case 23 when the pump 22 is stopped.

Here, a radial plate piece 36 is provided on the lower surface of the inner lid 29, and the upper portion of the filter 37 is press-fitted into the plate piece 36. Can be taken out.

The filter 37 taken out from the filter case 23 is washed while holding the inner lid 29, and at the time of replacement, a part of the outer circumference of the tip of the filter 37 is pressed against the fixing portion to remove the inner lid 29 and the filter 37. A bending load is applied to the connection portion of the two to separate them, and a new filter 37 is press-fitted into the plate piece 36 of the inner lid 29.

[0028]

As described above, according to the present invention, since the filter can be taken out from the inside of the filter case by gripping the inner lid, the processing liquid is not touched by the hand and the filter can be washed and replaced. You can do it safely.

Further, since the plate pieces radially arranged on the lower surface of the inner lid are press-fitted into the inner lower portion of the filter, the filter can be easily attached to and detached from the inner lid and can be stably attached. Moreover, since the filter is set at a predetermined position by setting the inner lid, the filter setting operation is easy.

[Brief description of drawings]

FIG. 1 is a schematic view of a filtration device according to the present invention.

FIG. 2 is an exploded perspective view showing an inner lid and a filter of the same.

FIG. 3 is a schematic view showing a conventional filtration device.

FIG. 4 is a schematic view showing another example of a conventional filtration device.

[Explanation of symbols]

 20 Processing Liquid Tank 21 Circulation Path 22 Pump 23 Filter Case 24 Inlet 25 Outlet 27 Lid 29 Middle Lid 36 Plate Piece 37 Filter

Claims (2)

[Claims] 1. A pump including a pump and a filter case having a processing liquid outlet / inlet, the inside of which is hermetically sealed by mounting a lid, in a circulation path that connects a lower portion and an upper portion of the processing liquid tank. The processing in the automatic processor that filters the processing liquid in the processing liquid tank sent into the filter case by the drive of the filter by the filter stored in the filter case and returns the processing liquid that has passed through the filter into the processing liquid tank. In the liquid filtering device, an inner lid to be pressed by a lid is detachably provided inside the filter case, and an upper portion of the filter is detachably attached to a lower surface of the inner lid. Liquid filtration device. 2. The means for detachably supporting the filter comprises a plurality of radially arranged plate pieces provided on the lower surface of the inner lid and press-fitted into the upper opening of the filter. The processing liquid filtering device in the automatic processor according to.