JPH10198241A - Device for removing image forming material from image carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for removing an image forming material from an image carrier, capable of preventing deterioration in performance such as peelability and toner fixability at the time of reforming an image by controlling the concn. of an unstabilizing liquid. SOLUTION: The unstabilizing liquid in a first liquid tank 61 is circulated/ supplied to a concentration sensor 71, to detect the concn. of the unstabilizing liquid by using the refraction of light occurring on the interface between the plane of a prism and a liquid. When the detected value exceeds a previously set reference value, the supply of the unstabilizing liquid to the concentration sensor 71 is stopped and water 76 in a second liquid tank 77 is supplied to the first liquid tank 61 from a water supplying pipe 79 through the concentration sensor 71 and a flowmeter 81 by a third pump 78.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, a facsimile, a printer, or the like, which removes an image forming substance formed on the image holding body and reproduces the image from the image holding body. The present invention relates to a forming substance removing device.

[0002]

2. Description of the Related Art Heretofore, as an apparatus for removing an image forming substance from an image carrier, a sheet as an image carrier having a surface to which toner as an image forming substance is stably adhered is attached to the surface and the toner. After applying a destabilizing liquid that makes the state of adhesion to an unstable state, the toner is removed from the paper by pressing the paper against a heated release member and adhesively transferring the toner onto the release member. Things are known.

In general, the destabilizing liquid is costly,
A mixed solution of a surfactant and water is used from the viewpoint of safety, maintainability, and the like. The mixing ratio of the surfactant and water in the mixed solution determines the performance such as the releasability and the toner fixing property at the time of re-image formation, and when the mixing ratio deviates from the predetermined mixing ratio, the performance is significantly reduced. Therefore, it is optimized in consideration of the performance.

[0004]

However, when a mixed solution of a surfactant and water is used as a destabilizing solution,
During operation and stoppage of the apparatus, the water content in the mixed solution evaporates, and the mixing ratio of the surfactant and water, that is, the concentration, changes. Is reduced.

[0005] In particular, when a method of applying a small amount of the above-mentioned mixed solution is employed, since the high-concentration solution is used, the above-mentioned performance is significantly reduced due to evaporation of water. Further, when the concentration of the mixed solution changes, the viscosity generally also changes, which also affects the liquid supply property.

The present invention has been made in view of the above problems, and an object of the present invention is to control the concentration of a destabilizing liquid to improve the releasability and the toner fixing property during re-image formation. An object of the present invention is to provide an apparatus for removing an image forming substance from an image holding member, which can prevent a decrease in performance.

[0007]

In order to achieve the above object, the present invention is directed to an image holding member having a surface on which an image forming substance is stably adhered. An image holding apparatus having a liquid application unit for applying a destabilizing liquid for making the adhered state unstable, and a peeling unit for peeling and removing the image forming substance on the image holding body to which the destabilizing liquid has been applied. A destabilizing solution replenishing and collecting section for replenishing the liquid applying section with the destabilizing liquid and collecting the destabilizing liquid from the liquid applying section; A concentration detecting section for detecting the concentration of the destabilizing liquid circulated from the section; and an unstable section when the concentration of the destabilizing liquid detected by the concentration detecting section exceeds a preset reference value. The liquid supply and recovery section is provided with a diluting liquid supply section for supplying a diluting liquid.

According to the first aspect of the present invention, in the apparatus for removing an image forming substance from an image holding member, a destabilizing liquid to be applied to the image holding member by a liquid applying portion is supplied from a destabilizing liquid supply and recovery portion. Is collected in the destabilizing liquid supply and recovery section.
Separately from the circulation path of the destabilizing liquid, a circulation path for circulating the destabilizing liquid from the destabilizing liquid supply / recovery section to the concentration detecting section is provided, and the concentration is detected. When the moisture contained in the destabilizing solution evaporates during operation or stop of the apparatus and the detected value exceeds a preset reference value, the diluent supply unit continues until the detected value reaches the reference value. The diluent is supplied to the destabilizing liquid replenishment and recovery section from the above to keep the water content in the destabilizing liquid constant. Thereby, the concentration of the destabilizing liquid optimized in consideration of the performance such as the releasability and the toner fixing property at the time of re-image formation is maintained. Further, by maintaining this concentration, the viscosity which affects the liquid supply property depending on the concentration is also kept constant.

Here, generally, in an industrial plant or the like,
It is known that the concentration of components in a solution is controlled using an expensive concentration control device. Further, in a wet image forming apparatus, it is known that the toner density in a developer is detected and controlled by using a change in light transmittance or specific gravity or by using a density sensor. . It is also conceivable to apply these concentration control means to the concentration control of the destabilizing solution. However, when the above-mentioned expensive concentration control device is applied, a problem that the cost is increased occurs. In addition, when light transmittance is used, there is a problem that erroneous detection occurs due to paper dust or toner mixed in the destabilizing liquid. Also, when using the above change in specific gravity,
The change in the specific gravity with respect to the concentration of the destabilizing solution is extremely small, which causes a problem that the detection is difficult. In addition, the method of directly monitoring the sensor by inserting it into the destabilizing solution has the disadvantage that frequent maintenance is necessary because impurities in the destabilizing solution contaminate the sensor surface and erroneous detection is likely to occur. Occur. In order to avoid these problems, it is desirable that the concentration detecting section constantly samples the destabilizing liquid and detects a minute change in its physical property value (refractive index or conductivity).

According to a second aspect of the present invention, in the apparatus for removing an image forming substance from an image carrier according to the first aspect, the diluting liquid supplied from the diluting liquid supply section to the destabilizing liquid supply / recovery section is: It is characterized by passing through the density detecting section.

According to the second aspect of the present invention, the diluent supplied from the diluent supply section to the destabilizing liquid supply / recovery section passes through the concentration detection section. Thus, each time the diluting liquid is supplied, the concentration detecting section is washed to remove attached substances and the like.

According to a third aspect of the present invention, in the apparatus for removing an image forming substance from an image carrier according to the first aspect, the destabilizing solution circulated and supplied from the destabilizing solution supply / recovery section to the density detecting section. Is characterized in that the concentration detector is moved upward from below.

According to the third aspect of the present invention, the destabilizing solution circulated from the destabilizing solution replenishment and recovery section to the density detecting section moves the density detecting section upward from below. Move towards. This makes it difficult for air bubbles and the like that cause erroneous detection to stay around the density detection unit.

According to a fourth aspect of the present invention, in the apparatus for removing an image forming substance from an image carrier according to the first aspect, the internal destabilizing solution is applied to the destabilizing solution replenishing and collecting section at a constant temperature. It is characterized in that a heating control means for controlling the temperature and a stirring means for stirring the internal destabilizing liquid and the diluent supplied from the diluent supply part are provided.

According to a fourth aspect of the present invention, the destabilizing solution in the destabilizing solution replenishment and recovery section is heated to a constant temperature by the heating control means, and the stirring means is provided. Thereby, the mixture is uniformly stirred with the diluent supplied from the diluent supply unit. Thereby, the temperature of the destabilizing liquid is kept constant and uniform. Here, when the temperature of the destabilizing liquid decreases, the viscosity thereof also decreases, so that the adhered substance easily adheres to the concentration detecting unit. On the other hand, by keeping the temperature of the destabilizing liquid constant, its viscosity is also kept constant, and it becomes difficult for the deposits to adhere to the concentration detecting section.

According to a fifth aspect of the present invention, in the apparatus for removing an image-forming substance from the image carrier according to the first aspect, the density detecting means in the density detecting section is configured to refract light generated at the interface between the prism plane and the liquid. It is characterized by utilizing the above.

According to a fifth aspect of the present invention, in the apparatus for removing an image forming substance from an image holding member, the density detecting means in the density detecting section comprises:
This utilizes refraction of light generated at the interface between the prism plane and the liquid. This concentration detecting means is not affected by the contamination of the destabilizing solution. If the concentration detecting means is configured so that the prism plane is in contact with the destabilizing liquid, the concentration detecting means does not have to be immersed in the destabilizing liquid.

According to a sixth aspect of the present invention, in the apparatus for removing an image forming substance from an image carrier according to the first aspect, a circulation path is provided for circulating and supplying the diluent from the diluent supply to the concentration detector. It is characterized by the following.

In the apparatus for removing an image forming substance from an image carrier according to a sixth aspect of the present invention, a circulation path for circulating and supplying a diluent from a diluent supply to a density detector is provided. Thereby, the concentration detecting section is cleaned. Note that an output correction means for correcting the output of the concentration detecting section when the diluent circulates may be provided.
Thereby, even if the measured value shifts due to contamination of the concentration detecting unit, the value can be easily corrected, and it is not necessary to clean or replace the concentration detecting unit.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention removes a heat-fusible toner (hereinafter, referred to as toner) as an image forming substance from a sheet material such as plain paper or an OHP sheet as an image holding member on which an image is formed. An embodiment applied to an apparatus for removing an image forming substance from an image carrier (hereinafter, referred to as a toner removing apparatus) will be described.

First, the outline of the toner removing device according to the embodiment will be described. In FIG. 1, the toner removing device includes a sheet feeding unit 20 that separates and feeds sheet materials 10 on which toner images formed in a stacked state are formed one by one.
And a liquid supply unit 30 as a liquid supply device for supplying a destabilizing liquid to the sheet material 10 sent from the sheet supply unit 20, and a peeling unit as a peeling unit for peeling toner from the sheet material 10 to which the liquid has been supplied. A toner removing unit 40, a drying unit 50 for drying the sheet material 10 from which the toner has been removed, and a sheet material 1 discharged from the drying unit 50
The destabilizing liquid is supplied to the paper receiving unit (not shown) and the liquid supply unit 30 for receiving the destabilizing liquid.
A destabilizing solution storage unit 60 serving as a destabilizing solution replenishing and collecting unit for recovering the destabilizing solution from the apparatus, and a concentration control unit 70 for controlling the concentration of the destabilizing solution in the destabilizing solution storage unit 60. Have. The destabilizing liquid storage unit 60 and the concentration control unit 70 will be described later in detail.

The sheet feeding unit 20 separates the sheet materials 10 set with the surface on which the toner image is formed (hereinafter, referred to as a toner image surface) downward by separating rollers 21 one by one. The sheet is fed into the liquid supply unit 30 at a predetermined timing by the registration roller 22, and is, for example, similar to a sheet supply unit in an electrophotographic copying machine.

The liquid supply unit 30 includes the sheet material 10
A liquid container 32 containing a destabilizing liquid 31 as a liquid for destabilizing the adhesion between the surface of the sheet material 10 and the toner, the liquid container 32 being made of an aqueous solution containing a surfactant to improve the permeability to the toner; The sheet material 10 is provided so as to be partially immersed in the liquid in the liquid container 32, and pumps up the liquid by rotation.
And a regulating roller 34 as a paper regulating member provided to face the applying roller 33 across the paper transport path.

The toner peeling unit 40 includes a toner offset belt (hereinafter, referred to as a peeling member) wound around a heating block 43 with a built-in heater 43a opposed to the drive roller 41, the support roller 42, and the transfer path of the transfer paper 10. A pressure roller 45 with a built-in heating lamp 45 a provided so as to press against the heating block 43 with the offset belt 44 interposed therebetween;
A belt cleaning device (not shown) for removing toner from the surface of the offset belt 44 is provided. Here, the drive roller 41, the support roller 42, the heating block 43, the offset belt 44, the pressure roller 45, and the tension roller 46 function as a transport unit that transports the sheet material 10.

At least the surface of the offset belt 44 is made of PET having an adhesive force to the softened toner that is larger than the adhesive force between the surface of the sheet material 10 and the toner.
It is formed of a synthetic resin material such as PC, PEEK, and PI.

The corner of the heating block 43 on the downstream side in the sheet material 10 conveying direction is formed at substantially 90 degrees, and the portion of the offset belt 44 passing therethrough changes the moving direction rapidly, and The curvature separation of the sheet material 10 from the sheet material 44 is performed.

The heating block 43 and the pressure roller 45 adhere the toner image surface of the sheet material 10 sent from the liquid supply unit 30 to the offset belt 44 and adhere to the sheet material 10. Is to heat and soften the existing toner.

Further, the belt cleaning device removes toner from the peripheral surface of the belt and stores the removed toner in a unit casing (not shown).

The drying unit 50 is for drying the sheet material 10 so that, for example, the liquid holding amount of the sheet material 10 is 10% or less of the weight of the sheet material, and is made of, for example, aluminum with a built-in halogen lamp 51a. It comprises a heating drum 51 and a paper pressing belt 53 that is wound around a plurality of support rollers 52 and that moves endlessly while being wound around the peripheral surface of the heating drum 51 at a fixed angle. As the material of the paper pressing belt 53, a material having heat resistance and air permeability, for example, cloth such as canvas, cotton, and tetron can be used.

The paper receiving unit includes a drying unit 50.
, A separation roller 55 for separating the sheet material 10 which has exited from the holding area between the heating drum 51 and the paper pressing belt 53, a discharge roller pair 56 for discharging the sheet material 10, a discharge roller It can be constituted by a paper discharge tray (not shown) for accommodating the sheet material 10 sent from the pair 56.

In the above configuration, when the apparatus is powered on, the operator operates the start button 91 on the operation panel 90.
When is pressed, the sheet material 10 sent from the sheet feeding unit 20 is supplied with the destabilizing liquid 31 uniformly on the toner image surface thereof by the liquid supply unit 30, and is sent to the toner peeling unit 40. In the toner peeling unit 40, the toner fixed to the sheet material 10 is heated and softened in a nip portion between the heating block 43 and the pressure roller 45, and adheres to the surface of the offset belt 44. And heating block 4
3 is separated from the sheet material 10 and the offset belt 44 around the downstream corner of the
The toner attached to the surface is peeled off from the sheet material 10, whereby the toner is removed from the sheet material 10. The sheet material 10 from which the toner has been removed is dried in the drying unit 50 and discharged to the paper receiving unit.

According to the above configuration, the liquid is supplied to the sheet material 10 to which the toner has adhered, and the toner is peeled off in a state where the liquid permeates the interface of the sheet material 10 with the toner.
The toner can be removed without damaging the paper fibers.

Next, the concentration control of the destabilizing liquid according to the present embodiment will be described. The concentration control of this destabilizing solution
During operation and stoppage of the apparatus, the moisture contained in the destabilizing solution evaporates and the concentration of the destabilizing solution changes, thereby deteriorating performance such as releasability and toner fixability during re-image formation. This is done to prevent that.

The destabilizing liquid storage unit 60 includes a first liquid tank 61 for storing the destabilizing liquid and a first liquid tank 6.
1 to the liquid container 3 of the liquid supply unit 30
A liquid supply pipe 63 provided with a first pump 62 for replenishing the liquid 2, a recovery pipe 64 for recovering excess destabilizing liquid in the liquid container 32, and a sheath type detecting the temperature of the destabilizing liquid. A temperature sensor 65, a stirring blade 67 serving as stirring means that is rotated by a motor 66 to equalize the temperature and concentration of the destabilizing liquid, and a float sensor 68 that monitors the liquid level in the first liquid tank 61. A planar heater 69 is provided as heating means for heating the destabilizing liquid to a constant temperature.

The temperature of the destabilizing liquid in the first liquid tank 61 is monitored by the temperature sensor 65. If the value detected by the temperature sensor 65 is lower than a predetermined temperature, the temperature is not changed until the temperature reaches the predetermined temperature. The stabilizing liquid is heated by the heater 69, and when the temperature is higher than a predetermined temperature, the apparatus is put into a standby state until the temperature reaches the predetermined temperature.

The liquid level of the destabilizing liquid in the first liquid tank 61 is monitored by the float sensor 68, and when a liquid shortage is detected, a liquid shortage lamp 93 of the operation panel 90 is turned on. Then, a new destabilizing liquid is supplied from the supply pipe 100, and the liquid level position is maintained. After the operator presses the start button 91 on the operation panel 90,
If a shortage of the destabilizing liquid is immediately detected, the apparatus is not started until replenishment of the destabilizing liquid is completed. If the destabilizing liquid shortage is detected during the operation of the apparatus, the peeling process is continued while the destabilizing liquid is supplied. In addition, when an overflow in which the level of the destabilizing liquid rises to a predetermined value or more due to various abnormalities is detected, the operation of the apparatus is stopped. (Hereinafter, margin)

The concentration control unit 70 provided adjacent to the destabilizing liquid storage unit 60 includes a concentration detecting section for detecting the concentration of the destabilizing liquid, and the destabilizing state detected by the concentration detecting section. A diluting liquid supply unit for supplying diluting liquid into the first liquid tank 61 when the concentration of the liquid exceeds a preset reference value (threshold value).

The concentration detector includes a concentration sensor 71, a pumping pipe 73 provided with a second pump 72 for circulating and supplying a destabilizing liquid from the first liquid tank 61 to the concentration sensor 71, and a return pipe 74. And

FIG. 2 is a block diagram of a control unit including a refractometer as an example of the density sensor 71. The refractometer includes a light source 71a (for example, an LED), a prism 71b,
A light receiver 71c (for example, a CCD), a temperature sensor 71d,
It is composed of an arithmetic processing unit 71e and the like. In the above configuration, the angle (position) of total reflection of light emitted from the light source 71a and reflected at the interface between the prism 71b and the destabilizing liquid is detected by the light receiver 71c, and the arithmetic processing unit 86e detects this angle. At the same time that the value is calculated, the correction is made using the liquid temperature data measured by the temperature sensor 71d. Then, it is finally converted into a concentration% (Brick%) and
5 is output. The angle of the total reflection is determined by the refractive index of the destabilizing liquid. Further, a conductivity meter or the like may be used instead of the refractometer.

The diluent supply section includes a second liquid tank 77 for storing water (including tap water) 76 as a diluent,
A water supply pipe 79 and a water recovery pipe 80 provided with a third pump 78 for circulating and supplying water 76 from the second liquid tank 77 to the concentration sensor 71, and from the second liquid tank 77 to the first liquid tank 61. A water supply pipe 82 provided with a flow meter 81 for supplying water 76.

Note that the second liquid tank 77 supplies the concentration sensor 7
The first to third valves 83 and 84, which are electromagnetic valves, are a flow path for circulating and supplying the water 76 to the first and a flow path for supplying the water 76 from the second liquid tank 77 to the first liquid tank 61. , 8
5 can be switched.

Also, without using the flow meter 81,
A method of setting the operation time of the third pump 78 by the timer means may be adopted.

In the above configuration, the concentration control of the destabilizing solution is performed as follows. By driving the second pump 72, the destabilizing liquid in the first liquid tank 71 is pumped up,
It is supplied from below A of the density sensor 71 to above B. At this time, the first valve 83 and the third valve 85 are each in a non-energized state, and the destabilizing liquid is recovered to the original first liquid tank 71 through the return pipe 74. As described above, a part of the destabilizing liquid is constantly circulated and monitored by the concentration sensor 71.

The concentration of the destabilizing liquid in the first liquid tank 61 increases due to evaporation of water, and the concentration of the liquid destabilizes, and the concentration detected by the concentration sensor 71 exceeds a preset reference value (threshold). Then, the circulating supply of the destabilizing liquid to the concentration sensor 71 by the second pump 72 is stopped, and the supply of water 76 from the second liquid tank 77 to the first liquid tank 61 is started. The water 76 in the second liquid tank 77 is supplied from the water supply pipe 54 by the third pump 78 to the concentration sensor 71 and the flow meter 8.
1 and is supplied to the first liquid tank 61. At this time, the first valve 83 and the third valve 85 are in the energized state, the second valve 84 is in the non-energized state, and the second pump 72 is provided with a check valve, so that the water 76 flows to another path. No spills. Also, the amount of supplied water 76 is
The operation of the third pump 78 is stopped after a predetermined amount of water 76 is supplied, being measured by the integrating type flow meter 81.

Here, when the supply of the water 76 to the first liquid tank 61 is carried out in a small number of times, the fluctuation of the concentration value of the destabilizing liquid can be reduced. After the supply of the water 76, the destabilizing liquid and the water are sufficiently stirred by the stirring blade 67. Note that the concentration detection during that period is temporarily invalidated, and the concentration detection is restarted after the stirring is completed.

If the concentration does not become lower than the reference value even after the water 76 is supplied a predetermined number of times (a predetermined amount), the water shortage lamp 94 on the operation panel 90 is turned on to stop the operation of the apparatus. May be.

When cleaning the prism surface of the density sensor 71, the operator operates the cleaning button 92 on the operation panel.
Is pressed, the second pump 72 is not operated, and the first to third pumps are not operated.
The valves 83, 84, and 85 are all energized, and the third pump 78 operates. Thus, the water 76 as a cleaning liquid is circulated and supplied from the second liquid tank 77 to the concentration sensor 71, and the prism surface is cleaned.

When the water 76 is circulating through the concentration sensor 71, the output value of the concentration sensor 71 may be corrected automatically or manually. In the present embodiment, the output value is corrected so that the detected value of the refractive index during the water circulation becomes Brix 0%. For example, the detected value of the refractive index during the water circulation is Brix0.
If it is 5%, the output value is corrected to be Brix 0%.

As described above, in the present embodiment, the concentration of the destabilizing liquid supplied from the first liquid tank 61 to the liquid supply unit 30 is detected by the concentration sensor 71, and the detected value is set to a predetermined reference value. If the value exceeds the reference value, water 76 is supplied from the second liquid tank 77 to the first liquid tank 61 until the detected value reaches the reference value to keep the water content in the destabilizing liquid constant.
Thereby, the concentration of the unstable liquid optimized in consideration of the performance such as the releasability and the toner fixing property at the time of re-image formation is maintained, so that the performance can be prevented from lowering. Further, by maintaining this concentration, the viscosity which affects the liquid supply property depending on the concentration is also kept constant, so that a decrease in the oil supply property can be prevented.

In this embodiment, the first liquid tank 61
A path through which the destabilizing liquid is circulated and supplied to the concentration sensor 71 is provided. This makes it possible to dispose the concentration sensor 71 outside the first liquid tank 61, thereby facilitating maintenance of the concentration sensor 71 and, at the same time, causing a liquid flow on the sensor surface, so that the concentration sensor 71 is less likely to be contaminated. .

In this embodiment, the destabilizing liquid circulated from the first liquid tank 61 to the concentration sensor 71 moves the concentration sensor 71 upward from below. This makes it difficult for air bubbles and the like that cause erroneous detection to stay around the density sensor 71, thereby reducing erroneous detection.

In this embodiment, the first liquid tank 61
The destabilizing liquid therein is heated and controlled to a constant temperature by the heater 69, and is uniformly stirred by the stirring blade 67 with the water 76 supplied from the second liquid tank 77. Accordingly, the temperature of the destabilizing liquid is kept constant and uniform, so that the influence of the temperature sensor 71 having the temperature dependency can be removed, and the detection accuracy is improved. Further, by keeping the temperature of the destabilizing liquid constant, the viscosity thereof is also kept constant, so that it is difficult for the attached matter to adhere to the concentration sensor 71, so that the concentration sensor 71 is not easily contaminated and the stable circulation is achieved. Can be expected.

In this embodiment, the concentration detecting means utilizes refraction of light generated at the interface between the prism surface and the destabilizing liquid. Since this concentration detecting means is not affected by the contamination of the destabilizing solution, the concentration can be detected accurately even if the contamination occurs. Also, this concentration detecting means
If the prism plane is configured to be in contact with the destabilizing solution, the concentration detecting means does not need to be immersed in the destabilizing solution, so that the contamination of the surface of the concentration sensor 71 can be reduced.

In this embodiment, a circulation path is provided for circulating water 76 from the second liquid tank 77 to the concentration sensor 71. Accordingly, the concentration sensor 71 is cleaned, so that maintenance can be performed without removing the concentration sensor 71 outside the apparatus.

In this embodiment, the water 76 supplied from the second liquid tank 77 to the first liquid tank 61 passes through the concentration sensor 71. Thus, every time the water 76 is replenished, the concentration sensor 71 is washed to remove the deposits and the like, so that the maintenance interval of the concentration sensor 71 performed by circulating and supplying the water 76 can be extended, and further, the maintenance is unnecessary. Can be Further, by correcting the output value of the concentration sensor 71 by the output correction means during the circulation of the water 76, even if the measurement value shifts due to contamination of the concentration sensor 71, the value can be easily corrected. Since there is no need to wash or replace 71, maintenance time can be reduced.

[0056]

According to the first to sixth aspects of the present invention, the concentration of the destabilizing liquid optimized in consideration of the performance such as the releasability and the toner fixing property during re-image formation is maintained. There is an excellent effect that the deterioration of the performance can be prevented. Further, since the viscosity which influences the lubricating property depending on the concentration of the destabilizing liquid is kept constant, there is an excellent effect that a decrease in the lubricating property can be prevented. Also, by providing a path through which the destabilizing liquid is circulated and supplied from the destabilizing liquid supply / recovery section to the concentration detecting section, the concentration detecting section can be disposed outside the destabilizing liquid supply / recovery section, At the same time, maintenance of the concentration detecting section is facilitated, and at the same time, a liquid flow is generated in the concentration detecting section, so that there is an excellent effect that the concentration detecting section is hardly contaminated.

In particular, according to the second aspect of the present invention, the concentration detecting section is washed to remove extraneous matter every time the diluting liquid is replenished. There is an excellent effect that the maintenance can be extended and the maintenance can be made unnecessary.

In particular, according to the third aspect of the present invention, there is an excellent effect that bubbles and the like which cause erroneous detection hardly stay around the density detector, and erroneous detection in the density detector can be reduced.

In particular, according to the invention of claim 4, since the temperature of the destabilizing solution is kept constant and uniform, it is possible to eliminate the influence of the case where the concentration detecting section has temperature dependency, and to achieve the detection accuracy. There is an excellent effect that is improved. In addition, by keeping the temperature of the destabilizing liquid constant, the viscosity is also kept constant and it is difficult for the adhered substance to adhere to the concentration detecting unit, so that the concentration detecting unit is not easily contaminated and the stable circulation is achieved. There is an excellent effect that can be expected.

In particular, according to the invention of claim 5, since the concentration detecting means is not affected by the contamination of the destabilizing solution, there is an excellent effect that the concentration can be detected accurately even if the contamination occurs. In addition, if the prism plane is configured to be in contact with the destabilizing liquid, the concentration detecting means does not need to be immersed in the destabilizing liquid, so that an excellent effect that contamination of the surface of the concentration detecting unit can be reduced can be achieved. There is.

In particular, according to the sixth aspect of the present invention, since the concentration detecting section is provided with a circulation path through which the diluent is circulated and supplied to clean the concentration detecting section, the concentration detecting section can be maintained without being removed from the apparatus. There is an excellent effect that it can be done. Also, by providing the output correction means, even if the measured value is shifted due to contamination of the density detecting section, the value can be easily corrected, and it is not necessary to clean or replace the density detecting section, There is an excellent effect that maintenance time can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a toner removing device according to an embodiment.

FIG. 2 is a block diagram of a control unit including a bending meter as an example of a density sensor in the toner removing device.

[Description of Signs] 10 Sheet material 20 Paper feed unit 30 Liquid supply unit 40 Toner peeling unit 50 Drying unit 60 Destabilizing liquid storage unit 61 First liquid tank 62 First pump 63 Liquid supply pipe 64 Recovery pipe 65 Temperature sensor 66 Motor 67 Stirring blade 68 Float sensor 69 Heater 70 Concentration control unit 71 Concentration sensor 72 Second pump 73 Pumping pipe 74 Return pipe 75 Control unit 76 Water 77 Second liquid tank 78 Third pump 79 Water supply pipe 80 Water recovery pipe 81 Flow meter 82 Water supply pipe 83 First valve 84 Second valve 85 Third valve 90 Operation panel 91 Start button 92 Wash button 93 Low liquid lamp 94 Low water lamp 100 Supply pipe

Claims (6)

[Claims] A liquid application section for applying an instability liquid to an image carrier having a surface to which an image forming substance is stably adhered, the destabilizing liquid making the state of adhesion between the surface and the image forming substance unstable; An image forming substance removing device for removing the image forming substance on the image holding member to which the destabilizing liquid is applied from the image holding member. A destabilizing liquid replenishing and collecting section for replenishing and recovering the destabilizing liquid from the liquid applying section, a concentration detecting section for detecting the concentration of the destabilizing liquid circulated and supplied from the destabilizing liquid supplying and collecting section, When the concentration of the destabilizing liquid detected by the concentration detecting section exceeds a preset reference value, a diluting liquid supply section for supplying a diluting liquid to the destabilizing liquid supply / recovery section is provided. A device for removing an image forming substance from an image carrier. 2. The apparatus according to claim 1, wherein the diluting liquid supplied from the diluting liquid supply unit to the destabilizing liquid supply / recovery unit passes through the concentration detecting unit. An apparatus for removing an image forming substance from an image carrier, comprising: 3. An apparatus for removing an image forming substance from an image carrier according to claim 1, wherein said destabilizing liquid circulated from said destabilizing liquid replenishing and collecting section to said density detecting section passes through said density detecting section. An apparatus for removing an image forming substance from an image carrier, wherein the apparatus moves upward from below. 4. An apparatus for removing an image forming substance from an image carrier according to claim 1, wherein said destabilizing liquid replenishment and recovery unit controls the internal destabilizing liquid to a predetermined temperature. And an agitating means for agitating the internal destabilizing liquid and the diluting liquid supplied from the diluting liquid supply unit. 5. The apparatus according to claim 1, wherein the density detecting means in the density detecting unit utilizes refraction of light generated at an interface between the prism plane and the liquid. An apparatus for removing an image forming substance from an image carrier, comprising: 6. The image holding apparatus according to claim 1, further comprising a circulation path through which the diluent is circulated and supplied from the diluent supply to the concentration detector. A device for removing imaging substances from the body.