JPS58116560A - Liquid developing copying device - Google Patents

Abstract

PURPOSE:To obtain an economical reusing device for a developer by collecting liquid containing carrier liquid vaporized from a developing and a fixing part in a tank which has two bulkheads, and separating the liquid into carrier liquid and water by the difference of specific gravity. CONSTITUTION:The tank 28 for storing collected liquid by collecting developer carrier vapor has two bulkheads 281 and 282; the collected liquid is separated by the 2nd bulkhead 282 up to a specific amount and in the 1st right chamber, the carrier liquid and water collected by a collecting device and other impurities are mixed and drops in the tank 28 through a waste liquid opening 27. The 1st bulkhead 281 prevents the mixed liquid of the carrier liquid and water from overflowing the 2nd bulkhead 282. The mixed liquid is stored in the 1st chamber firstly and separated into the carrier liquid 41 at an upper part and water 42 at a lower part completely by their difference in specific gravity; and only the carrier liquid 41 is allowed to overflow the peak 282a of the 2nd bulkhead 282 and collected in the 2nd left chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electrophotographic copying apparatus using a liquid development method.
The present invention relates to a liquid development copying apparatus in which evaporated carrier liquid from a developing section and a fixing section is collected within the apparatus, and is circulated to the developing section for reuse.

Conventionally, in liquid development electrophotographic copying machines, a photoreceptor is introduced into a developing solution in which a toner is dispersed and a petroleum-based carrier liquid is used to visualize the photoreceptor. Most of the attached developer is squeezed out, and the remaining carrier liquid is evaporated in a fixing dryer to fix the toner. In the case of the transfer method, the toner image on the photoreceptor is transferred to a transfer material via a carrier liquid, and the remaining carrier liquid is similarly evaporated in a fixing dryer to fix the toner image.

In this case, the evaporated carrier vapor is generally directly discharged outside the machine and diffused into the room, but since the carrier liquid is a petroleum-based solvent and is not sanitary, even a small amount of accumulation cannot be ignored. Particularly when copying machines are used in a closed room, the amount of carrier vapor discharged per unit time tends to increase due to the increased speeds of recent times. be.

In addition, the carrier liquid carried away from i (#5) by the photosensitive material or transfer material is a very small amount (0.3~1c) per sheet.
However, if a large number of copies are made, the amount is considerable and cannot be ignored economically.

In view of the above points, the present invention is devised so that the carrier steam is recycled without being discharged outside the machine, and in the circulation system, the carrier steam is vertically compressed to a high concentration and collected and removed from the air. Hygiene by.

In addition, it also has economical features, as it allows the recovered carrier liquid to be reused for development.

The present invention relates to an apparatus that separates the carrier liquid collected and removed from the air from the moisture contained in the air and copying materials that are collected at the same time, and circulates only the carrier liquid to a developing tank for reuse. be.

To explain the embodiment shown in the drawings, in FIG. It is introduced through the inlet 2 and delivered to the tray 4 through the outlet 6.

The fixing drying chamber has a structure as airtight as possible. The outlet 3 is also sealed with sealing rollers 51, 51, 61 and a fist 61. Transfer material S led into the fixing drying chamber 1 from the entrance 2
Proceeds in close contact with the heating plate 7 which has a built-in heater on the back side,
The surface is blown with air from the duct 8 to be pre-dried. Next, it passes between a heat row 29 with a built-in heater and a push row 210 to completely evaporate the carrier liquid and dry and fix it.

A suction port 11 is provided in the rear half of the fixing drying chamber 1, and high-temperature air containing carrier vapor is guided to a recovery device 16 provided in a part of the stand 12 of the copying machine (into the recovery device 13). Air is sucked into the blower 16 via the heat exchanger/condenser 14 and the mist collector 15.

The air blown out from the blower 16 is guided from the duct 17 to the duct 8 through the heat exchanger 141, and is blown out into the fixing drying chamber 1 again, forming a circulation path.

A part of the air is branched from a duct 17 and guided to a cooling chamber 18 such as a refrigerator, and is discharged from an exhaust port 19 to the outside of the machine.

In the above configuration, the air containing carrier vapor in the fixing drying chamber 1 is circulated by the blower 16 and a portion is discharged outside the machine from the exhaust port 19, so that the pressure inside the fixing drying chamber 1 becomes below atmospheric pressure. . Therefore, the air in the fixing drying chamber 1 that contains carrier vapor at a high degree of permeability is practically unavoidable.
It does not leak outside, but rather due to the force of the opening)
You will be breathing in a small amount of air. An amount of air commensurate with that amount is discharged to the outside of the machine from the exhaust port 19.

A method for recovering gear fluid will be explained below. Second
The heat exchange condenser 14 shown in the figure is a cross-flow type heat exchanger in which thin plates 20 with good thermal conductivity are stacked with spacers 21 in between. In the first stage 141, the air that is cooled to room temperature, recovers the carrier liquid, and returns to the fixing/drying chamber 1 is used for cooling.

In addition, in the 2nd and 6th stages 14m and 141, fans 22
It is cooled by the outside air C drawn in by.

The high temperature air Al containing a high concentration of carrier vapor led from the fixing drying chamber 1 is passed through the heat exchange condenser 14 as described above.
As it passes through, it is immediately cooled to near room temperature. As a result, the carrier gas in the air becomes supersaturated, and some of the carrier gas condenses and adheres to the walls of the condenser, grows into large droplets, and falls. In addition, most of the remaining liquid becomes minute droplets in the air and floats in the air as mist. The air Am, which has been cooled to near room temperature and contains carrier vapor mist, is then led to the mist collector 15.

In the mist collector 15, as shown in Fig. 6, an electric plate 26 to which a direct current voltage is applied and a grounded electrode plate or electrode mesh 24 are insulated from each other and arranged at an excessive distance. Nearby high voltage electrode, temporary 23, needle end discharge electrode 2
5 is provided. 1. The mist is made to fluoresce by passing the needle end discharge through the corona discharge between the pole and the earth electrode.
When it passes through the electric field between the subsequent electrode plates, it is attracted to the ground electrode by Coulomb force, adheres to it, and falls down. With this mist collector, the mist in the air A2 is completely removed (more than 90%), but the remaining carrier mist can be easily removed by filter 2, such as a wire mesh installed next.
The air A5, which is completely removed in step 6 and containing only a small amount of carrier vapor (saturated vapor at room temperature), is returned to the fixing drying chamber by blower 16&C and used again. Heat exchanger/condenser 14
The carrier liquid liquefied in the mist collector 15 is collected in a tank 28 through a discharge port 27, and is returned to the developing device to form a trap for reuse.

is extremely cooled in the cooling chamber 1B, and almost all of the carrier vapor in the air is liquefied and released into the outside air. Therefore, this exhaust air A5 is not only small in volume but also completely cleaned, so it will not harm the health of the body.

The ridge a of the tank 28 is shown in FIG.

The tank 2B for recovering the current drug carrier vapor and storing the recovered liquid has a first partition wall 28+r and a 1g2 partition wall 282, and the recovered liquid is kept at a constant MV by the second partition wall 282.
In the first chamber (right 111), the carrier liquid collected by the recovery device described in Ad, mixed with moisture and other impurities, passes through 27 cultivation liquid chambers and drips into the tank 28. The first partition wall 281 is for protection to prevent the mixed liquid of the carrier liquid and water from directly running on the surface of the recovered liquid and exceeding the second partition wall, and the 70F end 281a is at least the upper end of the first partition wall. From 282a to 1ka. The above mixture number (carrier liquid +
Water) is first stored in the first chamber, and as time passes, the carrier liquid 41 is Unfortunately, the water 42 is completely below + m. - [As is already clear, the carrier liquid constituting the developer must be insulating, so water cannot be mixed in. Then, in the first vine, both of them are divided into all the beggars, and when it reaches a certain point, only the isoper 14 enemies who are above are overflowed the top 282a of the second partition wall 282 and gathered in the second chamber (left ventricle). The carrier rL collected in the second chamber passes through a pipe 32 by a bonder 31 driven by a motor 299 and a rotating shaft 30, and is transferred to a developing tank DK, which is a quasi-body developer storage wt and a final means. It is reused as a developer.However, in this case, since the carrier liquid does not contain a developer, it is safe to add the appropriate Itsumugi developer and control the concentration of the Itsumugi liquid with the toner #agricultural regulator. .

There is a history of WCf in the recovered liquid processing tank 28 of the W4 structure as described above.
fL direction detection hands and thighs respectively. It is located in the second room.

Since the recovered and stored water must not overflow the second partition wall 282, the liquid level of the lower layer in the upper) 2nd layer is lower than the liquid level in the lower layer. : If it is detected and this becomes - foot cover or higher, you can feel safe removing it.

This detection means, shown in Fig. 4, detects the level based on the difference in dielectric constant between the carrier liquid and water. Two conductive plates are placed close to each other and the change in intoxication rate between them is detected. This circuit is shown in Figure 6.

When the water in the lower layer reaches a certain level or higher, Oniki No. 16 opens the electric value box 1 for a certain period of time, and the water is dropped into a tank 36 located approximately below the tank 28. The 11Lm valve v1, which has been opened for a time when the moisture 42 has completely fallen off, is then closed and the recovered liquid is stored again. Also, in the second chamber, a float 66 is installed as a level detection means to control the liquid level within a certain range.
An actuator 64 actuated by the float 53 VC. Micro switch fMs operated by actuator 64 1. MS 2'1elf"j
, to MSl! i%k[ID(') is used to detect the upper limit value, MS2 is to detect the lower limit value, and the operating circuit 'Ijr: As shown in Fig. 7, the float 63 is floating and the actuator 64 is a micro switch as shown in Figure 7. MS2i
When it is separated, MS2 turns ON, and the liquid ■ further rises, and when the actuator 64 turns MS1 to 0NVC-f, the relay L is turned on.
-A is activated and - (relay contact a-1 is turned on, motor M29 is activated, and the pump 61 lifts the carrier & up to the boundary tank Drc. MS1 immediately became "OFk" and almost couldn't look up the carrier Q41Y, so relay 1 (, L-A
Contact a-2 of V-Y hold 1゜MS1 is 0FII
VC is set so that the motor continues to operate even when the temperature reaches ', and the motor M is turned off and the pump operation is stopped only when the lower limit detection microswitch MS2 of *tm is turned off. Also, Figure 5 shows the bell on the lower level of the Mi room!
Detection is performed using a float 40 and a microswitch M83, and a photo U-40 is placed at the interface between the two layers by utilizing the ratio difference (0.75:1) between the upper and lower two layers. When the float 4D reaches a certain level, MS6 is activated, and the electromagnetic valve ■1'Ia: opens and the lower layer liquid is poured into the lower tank 66.

Also, in this embodiment, the developing section D is 1721% [level detection micro switch M84. A J Kuchi unit 68° float 37 is installed, and the carrier liquid (IH) collected in advance in the second chamber of the tank 2F is mixed by overflowing from the first tube, and by the operation of the level detection device in the dust swimming area. The pump 51 is operated to supply the enemy to the developing section. In addition, not only the carrier book but also the developer may be stored in the second chamber, mixed with the recovered carrier g, and circulated to the developing device.

In this way, a constant amount of developer can always be held in the developer section, regardless of the amount of carrier solution recovered or its changes.

// , , > , , , J 7-'' Next, the electric circuit of Fig. 6 will be explained. 1 is a pace-tuned oscillation circuit, 2 is a voltage doubler detection circuit, 6 is a detection output voltage amplification circuit and a thyristor. The tuning frequency of the detection circuit is changed by the change in the capacitance of the intermediate jitter Ox using the citric circuit. In other words, water fills between the electrodes of Ox, and the capacitance of Cx is filled with air or iso/(-) between the electrodes. When the frequency increases, the tuning frequency decreases.

The closer this tuning frequency f is to the frequency f0 of the oscillation circuit, the higher the output voltage of the detection circuit can be obtained, and this can be used to detect the level. That is, if the oscillation frequency of the dotted line frame 1 is fo, now ♀I is filled with water and the tuning frequency f of T is 1. ;1.1 and its output voltage E1 and Kr
is adjusted by VR so that it becomes Kt) iCr, and an output voltage KO is generated at the amplification circuit. m so that this value is sufficient to trigger the Iristor SOR.
w has been done. When dayristor 5Of (F is triggered, K is energized and 6 is closed, motor U rotates and MS
, is closed, and the pulp opening/closing (DO SL is also energized and the pulp is opened.) When the motor M rotates and MS is pushed by cam 1, M81 fights, the iris-SOR is turned off, and K is also turned on at the same time. Cut KLI K, open S
L excitation 4 is cut and the pulp closes. Even if K1 opens, motor M continues to rotate because MS is closed, but when cam 2 presses MS, MS opens and motor M stops and prepares for the next operation.

The present invention has the above-mentioned structure, and the collected liquid containing the evaporated carrier liquid from the developing section and the fixing section is collected in the first stage.
It is collected in a tank with a partition wall and a second partition wall, and separated by a device that can perform complete pressure separation using the difference in specific gravity between the carrier liquid and water.The middle liquid is returned to the developing tank and can be reused, making it extremely economical. The present invention provides a developing solution reusing device.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of a duplication model employing an embodiment of the present invention, FIG. 2 is a perspective view of an example of a condensing means for heat exchange, and FIG. 6 is a perspective view of an example of a mist collection means. FIG. 4 is a schematic diagram showing a first embodiment of the invention, and FIG. 5 is a schematic diagram showing a second embodiment of the invention. FIG. 6 is an electric circuit diagram for detecting changes in the dielectric constant of the electrode plate, and FIG. 7 is an operating circuit diagram for detecting the upper and lower limits of the second chamber. 27 is a drain port, 28 is a tank, 281 is a first partition wall, 28
- is the second bulkhead, 29 is the motor, 51 is the pump, 52 is the pipe, ! 15, 57.40 is a float, 65 is an electrode plate, 66 is a drainage tank, 41 is a liquid, and 42 is water. Applicant: Yayanon Co., Ltd.

Claims (1)

[Claims] (1) A developing means for visualizing a latent wound in an M-body wound, a drying section for drying a copying material having a liquid developed image developed by the nuclear developing means, and separated by the recovered liquid storage means. A carrier liquid storage means for storing a carrier liquid; a developer level detection means for detecting a developer level in the developing means; and a developer level detection means for supplying the developer in the gear storage means to the developing means in response to detection by the detection means. 1. A liquid development copying apparatus, comprising: a supply means for maintaining a constant amount of developer in the development means.