JP4384884B2 - Carrier liquid recycling equipment - Google Patents

Description

  The present invention relates to a carrier liquid recycling apparatus for use in a printing process of a liquid developing electrophotographic apparatus using a high-viscosity, non-volatile liquid developer as a developer, and uses a carrier liquid necessary for the apparatus with a simple structure. By separating and extracting solid components from spent carrier liquid and minimizing the amount of carrier liquid discarded at this time, a carrier liquid recycling device that enables highly efficient recycling is realized. is there.

  In a liquid developing electrophotographic apparatus that uses a high-viscosity, non-volatile liquid developer for image development, the liquid developer remaining on the surface of the photoreceptor or intermediate transfer member that has not been used in the printing process has been collected. An apparatus that recycles the recovered liquid developer is used.

  In such a liquid developer recycling apparatus, a process for separating the toner particles, which are solid components in the liquid developer, and the carrier liquid, which is a liquid component, is performed. When applying the liquid developer to the electrostatic latent image formed thereon, the electrostatic latent image on the photoconductor is a pretreatment for applying the liquid developer so that toner particles that are solid components do not adhere to non-image areas. It is also used as a pre-wet liquid applied to the surface.

  It is desired to completely remove toner particles that are solid components from the carrier liquid that is also used as such a pre-wet liquid, and as an apparatus for completely removing the solid components from the carrier liquid, FIG. A cylindrical pipe-shaped external electrode as shown in FIG. 21 and a conductive roller internal electrode inside are provided, and the untreated carrier liquid is injected into the gap between the external electrode and the internal electrode, and the conductive roller internal electrode is injected. The untreated carrier liquid is moved in the gap by rotating in the direction from the inlet to the outlet, and a bias voltage is applied between the external electrode and the internal electrode during this movement, so that An apparatus for separating a solid component from a carrier liquid and extracting a pure carrier liquid by adhering the solid component has been devised (see Patent Document 1).

  However, even when such a device can extract a sufficiently pure carrier liquid during normal printing processing, some abnormality occurs in the device, and the toner image remains on the printing member without being used. When the recovered untreated carrier liquid contains a large amount of solid components, the solid component removal ability from the carrier liquid is low in such an apparatus, and the solid components are removed from the carrier liquid. In some cases, it could not be completely removed.

  Moreover, in the conventional apparatus, since the carrier liquid separated in the upper layer portion near the treated carrier liquid suction port is taken out from the suction port, the treated carrier liquid not containing the solid component is extracted. Further, the solid component adhering to the inner electrode of the conductive roller is discarded while a considerable amount of the carrier liquid is contained, and there is a problem that the recycling efficiency of the carrier liquid is low.

Japanese Patent Application No. 2002-068307

As described above, the conventional techniques have the following problems.
In a liquid development electrophotographic apparatus that uses a high-viscosity, non-volatile liquid developer as a developer, the liquid development remaining on a printing member such as a photoreceptor or an intermediate transfer member without being conventionally used in a printing process. The agent is collected and recycled.

  In such a liquid developer recycling process, toner particles that are solid components in the liquid developer and carrier liquid that is liquid components are separated, and the recycled carrier liquid is pre-wet liquid. However, it is desirable that the solid component in the treated carrier liquid is completely removed.

  Conventionally, a carrier liquid recycling apparatus as shown in FIG. 21 has been devised as such a carrier liquid recycling apparatus. However, in such an apparatus, the liquid developer collected in the recycling process during a normal printing process is used. A pure carrier liquid can be extracted from the agent, but if any abnormality occurs in the equipment and the recovered liquid developer contains a large amount of solid components, the solid components should be completely removed. There was a case that could not be.

  In addition, in the conventional carrier liquid recycling apparatus, as a method for extracting the treated carrier liquid, an electric field force is applied in a direction to attach a solid component to the surface of the inner electrode of the conductive roller by applying a bias voltage, thereby Since only the upper layer carrier liquid that does not contain the solid component on the external electrode side of the carrier liquid injected between the electrodes is taken out, the lower layer carrier liquid is attached together with the solid component adhering to the internal electrode surface. There is a problem that the recycling efficiency of the carrier liquid is low due to being discarded.

  An object of the present invention is to recycle a liquid developer remaining on a printing member without being used in a printing process in a liquid development electrophotographic apparatus using a high-viscosity and non-volatile liquid developer as a developer. A carrier liquid recycling apparatus for extracting a carrier liquid, which can extract a pure carrier liquid even if an abnormality occurs during printing and a large amount of solid components are contained in the collected liquid developer. An object of the present invention is to provide a carrier liquid recycling apparatus capable of recycling the carrier liquid with high efficiency by removing the carrier liquid as much as possible from the solid components to be discarded.

  In order to solve the above problems, the present invention takes the following means.

  A cylindrical pipe-shaped external electrode and a conductive roller internal electrode inside it are formed with a predetermined gap, and the external electrode has an untreated carrier liquid inlet, a treated carrier liquid suction port, and a solid waste component. The conductive roller internal electrode has a structure that rotates in the direction opposite to the direction in which the carrier liquid flows from the inlet to the suction port. The carrier liquid recycling device.

  By providing means for applying a bias voltage between the external electrode and the internal electrode of the carrier liquid recycling apparatus until the untreated carrier liquid is injected from the carrier liquid injection port and sucked from the suction port as the processed carrier liquid In the meantime, an electric field force is applied so that the solid component in the untreated carrier liquid is pressed against the internal electrode side.

  As a result, the solid component adhered and deposited on the surface of the internal electrode moves toward the opening for discharging the solid component provided on the external electrode by the rotation of the internal electrode. A waste liquid component removal pressure applying means for removing the excess carrier component from the waste solid component by applying pressure to the internal electrode side with an elastic body is provided.

  The carrier in the waste solid component that removes the excess carrier component from the flow rate of the untreated carrier liquid injected from the untreated carrier liquid inlet provided in the cylindrical pipe-shaped external electrode, the rotation speed of the conductive roller internal electrode, and the waste solid component By variably controlling the pressure applied by the pressure removing means for removing liquid according to the concentration of the solid component contained in the untreated carrier liquid, the carrier liquid is almost completely contained in the untreated carrier liquid at any concentration. The solid components are removed from the product, only pure carrier liquid is extracted, and the carrier liquid contained in the waste solid components is minimized.

  As means for detecting the solid component concentration in the untreated carrier liquid, there is provided means for measuring the current flowing when the solid component in the carrier liquid moves to the internal electrode side by a bias voltage applied between the external electrode and the internal electrode. Alternatively, the concentration may be measured by an optical density sensor or an ultrasonic sensor before the untreated carrier liquid is injected.

  For controlling the injection flow rate of the untreated carrier liquid and the rotation speed of the inner electrode of the conductive roller, the value of the current flowing by the bias voltage applied between the outer electrode and the inner electrode while keeping the rotation speed of the inner electrode of the conductive roller constant. Alternatively, the concentration of the untreated carrier liquid may be estimated, the amount of untreated carrier liquid that can be processed by the carrier liquid recycling apparatus is calculated, and the injection flow rate of the untreated carrier liquid may be determined.

  In order to control the injection flow rate of the untreated carrier liquid and the rotation speed of the internal electrode of the conductive roller, the flow rate of the unprocessed carrier liquid is not determined from the current value flowing by the bias voltage applied between the external electrode and the internal electrode while keeping the injection flow rate of the untreated carrier liquid constant. The concentration of the treatment carrier liquid may be estimated, and the rotational speed of the conductive roller internal electrode necessary for the treatment may be calculated and determined from the injection amount and concentration of the untreated carrier liquid.

  As a control of the injection flow rate of the untreated carrier liquid and the rotation speed of the conductive roller internal electrode, the rotation speed of the conductive roller internal electrode is configured to have a plurality of rotation modes from low speed to high speed rotating at a constant speed. The concentration of the untreated carrier liquid can be estimated by estimating the concentration of the untreated carrier liquid for each rotation mode and the concentration of the untreated carrier liquid from the current value flowing by applying a bias voltage between the external electrode and the internal electrode. The amount of the untreated carrier liquid may be calculated and the flow rate of the untreated carrier liquid to be injected may be determined.

  Even if the injection flow rate of the untreated carrier liquid is minimized, if the current value of the upper limit predetermined for the rotation mode is exceeded, the rotation mode can be controlled to make a transition to a one-step high-speed rotation mode. Good.

  When the processing amount required by the liquid developing electrophotographic apparatus as the injection flow rate of the untreated carrier liquid is satisfied, the rotation mode is maintained, and when the processing amount of the untreated carrier liquid does not satisfy the required amount, You may comprise so that it may control preferentially that the processing amount of an un-processed carrier liquid satisfy | fills a required amount by changing to the rotation mode of one step high speed from the rotation mode.

  If the injection flow rate of the untreated carrier liquid satisfies the processing amount required by the liquid developing electrophotographic apparatus and falls below the lower limit current value predetermined for the rotation mode, the rotation mode Control may be made so as to make a transition to a one-step low-speed rotation mode.

  For each of the above rotation modes, the upper limit current value and the lower limit current value of the current generated by the solid component in the carrier liquid moving to the internal electrode side by the bias voltage applied between the external electrode and the internal electrode are set in advance. The lower limit current value may be set to be equal to or lower than the upper limit current value and the optimum current value of the one-stage low-speed rotation mode.

  Since the solid component concentration of the injected untreated carrier liquid is high, when the current flowing due to the bias voltage between the external electrode and the internal electrode exceeds the upper limit current value, the untreated carrier liquid is injected and the treated carrier liquid By temporarily stopping the suction and continuing the rotation of the conductive roller internal electrode and the application of the bias voltage between the external electrode and the internal electrode, the removal of the solid component in the untreated carrier liquid is not in time, and the treated carrier You may make it prevent discharge | emission in the state in which the solid component was contained in the liquid.

  The treated carrier liquid is again injected into the carrier liquid recycling device, and the current value measured by applying a bias voltage between the external electrode and the internal electrode due to a factor other than the solid component is measured, and the measured current value Is added to the upper limit current value and the lower limit current value of each rotation mode, and the injection flow rate of the untreated carrier liquid and the rotation mode of the conductive roller internal electrode are controlled using these as the true upper limit current value and the lower limit current value. It may be.

  If the concentration of solid components contained in the untreated carrier liquid is very high and exceeds the solid component removal capability of the carrier liquid recycling device, the untreated carrier liquid is untreated when the untreated carrier liquid is injected. You may comprise so that it can mix with carrier liquid and inject | pour into the said carrier liquid recycling apparatus.

  When mixing the untreated carrier liquid and the treated carrier liquid and injecting them into the carrier liquid recycling apparatus, the mixing ratio of the untreated carrier liquid and the treated carrier liquid and the current value flowing between the external electrode and the internal electrode thereby The injection flow rate of the necessary processed carrier liquid may be determined and variably controlled to enable injection.

  The solid component concentration measuring means for measuring the concentration of the solid component contained in the untreated carrier liquid injected from the untreated carrier liquid injection port provided in the cylindrical pipe-shaped external electrode before the injection is provided. According to the solid component concentration measured by the above, the injection flow rate of the untreated carrier liquid and the rotation speed of the conductive roller internal electrode are determined so that the solid component can be completely removed from the untreated carrier liquid by the carrier liquid recycling apparatus. You may comprise.

  It is configured to include solid component detection means for detecting whether or not a solid component is contained in the treated carrier liquid sucked from the treated carrier liquid suction port provided in the cylindrical pipe-shaped external electrode. If the solid component detection means provided detects that the treated carrier liquid contains a solid component, it is determined that a recycling process failure has occurred, and the treated carrier liquid is again treated as an untreated carrier liquid. You may comprise so that it can reinject | pour into a carrier liquid recycling apparatus.

  In addition, when the solid component detection means provided in the suction port detects that the solid component is contained in the treated carrier liquid, the rotational speed of the conductive roller internal electrode is increased, and the untreated carrier You may comprise so that the removal of the solid component in an un-processed carrier liquid can be performed completely by reducing the injection quantity of a liquid.

  Part or all of the cylindrical pipe-shaped external electrode is made of a transparent conductive material, and is installed by an optical density sensor installed from the outside of the cylindrical pipe-shaped external electrode toward the carrier liquid flow path between the external electrode and the internal electrode. , Detecting a boundary position where the solid component concentration in the untreated carrier liquid flowing through the carrier flow path is less than a predetermined solid component concentration at which it can be determined that the solid component has been removed, and this boundary position is a predetermined distance from the treated carrier liquid suction port. You may comprise so that the injection | pouring flow volume of a non-processed carrier liquid and the rotational speed of an electroconductive roller internal electrode may be determined so that it may become the position kept.

  An optical density sensor in which part or all of the inner electrode of the conductive roller is made of a transparent conductive material and is installed from the inner side of the inner electrode of the conductive roller toward the carrier liquid flow path between the outer electrode and the inner electrode. Detects a boundary position where the concentration of the solid component in the untreated carrier liquid flowing through the carrier liquid flow path is less than or equal to a predetermined solid component concentration at which it can be determined that the solid component has been removed. You may comprise so that the injection | pouring flow volume of a non-processed carrier liquid and the rotational speed of an electroconductive roller internal electrode may be determined so that it may become a position which kept the distance.

  An ultrasonic sensor is placed in contact with the carrier liquid flow path between the external electrode and the internal electrode, and the concentration of the solid component in the carrier liquid flowing in the carrier liquid flow path is measured by this ultrasonic sensor, so that the untreated Detects a boundary position where the solid component concentration is less than or equal to a predetermined solid component concentration at which it can be determined that the solid component in the carrier liquid has been removed, and unprocessed so that this boundary position is a position that maintains a predetermined distance from the treated carrier liquid suction port You may comprise so that the injection | pouring flow rate of carrier liquid and the rotational speed of an electroconductive roller internal electrode may be determined.

  An ultrasonic sensor is installed between the untreated carrier liquid inlet and the waste solid component outlet provided on the cylindrical pipe-shaped external electrode, and the solid components are discharged by the pressure means for removing the carrier liquid in the waste solid components. Detects the boundary position where the concentration exceeds the predetermined concentration by depositing before the outlet, and removes the carrier liquid in the waste solid component so that the boundary position is at a predetermined distance from the untreated carrier liquid inlet. The pressure applied to the pressure means, the rotation speed of the inner electrode of the conductive roller, and the injection flow rate of the untreated carrier liquid may be determined.

  A forward blade with light pressure applied to the inner electrode side of the conductive roller is installed between the inlet of the untreated carrier liquid provided on the cylindrical pipe-shaped outer electrode and the outlet of the waste solid component. It is configured to include means for measuring the pressure between the pressurized forward blade and the pressure means for removing the carrier liquid in the waste solid component, and the light pressure forward blade and the carrier liquid removal in the waste solid component are attached. The pressure applied to the pressure means for removing the carrier liquid in the waste solid component, the rotation speed of the inner electrode of the conductive roller, and the injection flow rate of the untreated carrier liquid so that the pressure between the pressure means does not exceed the predetermined pressure. You may comprise so that it may determine.

  According to the present invention, the following effects can be expected.

  In a liquid development electrophotographic apparatus using a high-viscosity, non-volatile liquid developer as a developer, the carrier liquid, which is a liquid component in the liquid developer, is used as a diluent for adjusting the concentration of the liquid developer. Because it is also used as a pre-wet liquid, it collects the liquid developer remaining on the printing member without being used in the printing process, and separates it into a carrier liquid and a solid component to recycle and use the carrier liquid Has been done.

  In such a carrier liquid recycling apparatus, since the recycled carrier liquid is also used as a pre-wet liquid at the time of development, it is necessary to completely remove solid components from the processed carrier liquid.

  For this purpose, a cylindrical pipe-shaped external electrode and a conductive roller internal electrode inside are provided, and an untreated carrier liquid is injected from an untreated carrier liquid injection port provided in the cylindrical pipe-shaped external electrode to process the conductive roller internal electrode. Rotate toward the finished carrier liquid outlet, and this rotation allows the untreated carrier liquid to flow from the inlet to the outlet between the external electrode and the internal electrode, while the bias voltage is applied between the external electrode and the internal electrode. A carrier liquid recycling apparatus has been devised that removes the solid component from the untreated carrier liquid by applying an electric field force that presses the solid component against the surface side of the inner electrode of the conductive roller.

  However, in such an apparatus, since the solid component contained in the untreated carrier liquid collected when the liquid developing electrophotographic apparatus is performing normal printing processing is small, the solid component is completely removed from the untreated carrier liquid. However, in the situation where some abnormality occurs in the printing process and a large amount of solid components are contained in the recovered untreated carrier liquid, the solid components are completely removed from the untreated carrier liquid. I couldn't.

  Further, in the conventional apparatus, in the recycling process of the carrier liquid, when separating the carrier liquid and the solid component, the separation can be performed only in a state where the carrier liquid is contained in a substantial amount in the solid component. However, a considerable amount of the carrier liquid is contained in the solid component to be discarded, and there is a problem that the recycling efficiency of the carrier liquid is low.

  By utilizing the present invention, the liquid developer remaining on the printing member without being used in the printing process of the liquid developing electrophotographic apparatus using a high-viscosity, non-volatile liquid developer as the developer is recovered, In the carrier liquid recycling device that recycles and uses the carrier liquid by removing the solid components from the carrier liquid, an abnormality occurs in the printing process, and the recovered untreated carrier liquid contains a large amount of solid components Even if it is, the solid component can be completely removed from the untreated carrier liquid, and the carrier liquid is hardly contained in the solid component discharged in the recycling process, so that the carrier liquid is highly efficient. It is possible to realize a carrier liquid recycling apparatus that can recycle.

  The present invention takes the following embodiments.

  A cylindrical pipe-shaped external electrode and a conductive roller internal electrode inside it with a predetermined gap, a means for applying a bias voltage is provided between the external electrode and the internal electrode, and the external electrode has an untreated carrier liquid. An inlet for discharging the treated carrier liquid, and an opening for discharging the waste solid component. The conductive roller internal electrode is disposed inside the external electrode from the carrier liquid inlet to the suction inlet. The carrier liquid recycling apparatus has a structure that rotates in the direction opposite to the direction in which the carrier liquid flows toward the head.

  As a result, the untreated carrier liquid injected from the untreated carrier liquid injection port flows through the gap provided between the external electrode and the internal electrode until it is sucked from the suction port as the processed carrier liquid. In the meantime, a solid component is pressed from the untreated carrier liquid to the internal electrode side by a bias voltage applied between the external electrode and the internal electrode, and an electric field force is applied so as to adhere and deposit, so that the carrier liquid and It becomes possible to separate the solid component.

  Here, the amount of the solid component that adheres to and deposits on a certain area of the internal electrode surface is more than a certain amount because the solid component having a charge accumulates on the internal electrode and the voltage between the external electrode and the internal electrode decreases. Although the solid component of the conductive roller cannot be separated and deposited, the conductive roller internal electrode rotates in the direction opposite to the direction in which the untreated carrier liquid flows, so that the inside of the untreated carrier liquid is in contact before being sucked from the suction port. The surface area of the electrode can be increased, and a larger amount of solid components can be removed from the untreated carrier liquid.

  The electrode surface layer of the conductive roller internal electrode is configured to include a semiconductive layer having a volume resistivity of 1 + E4 to 1 + E10 (Ω · cm) and good peelability.

  As a result, a bias voltage applied between the external electrode and the internal electrode generates a discharge between the external electrode and the internal electrode, and the electric field force applied to the untreated carrier liquid is reduced, so that the solid component in the untreated carrier liquid is reduced. Incomplete removal can be prevented, and solid components deposited on the internal electrode surface can be easily removed with a blade or the like.

  When discarding the solid component deposited on the surface of the conductive roller internal electrode at the notch, which is the solid component discharge port provided in the cylindrical pipe-shaped external electrode, the elastic roller is applied to the surface of the conductive roller internal electrode. And a pressure means for removing the carrier liquid in the waste solid component for removing the carrier liquid contained in the waste solid component.

  As a result, the carrier liquid contained in the solid component at the time of disposal can be reduced as much as possible by squeezing out the carrier liquid contained in the solid component from the solid component separated from the untreated carrier liquid. Recycling efficiency can be increased.

  You may comprise so that the pressurization pressure added to the said pressurization means for carrier liquid removal in the said waste solid component can be made variable.

  As a result, when the rotational speed of the conductive roller internal electrode is set to a high speed, the carrier liquid contained in the waste solid component can be squeezed out more by applying a larger pressure, and the carrier to be discarded. By reducing the amount of liquid, it becomes possible to perform highly efficient carrier liquid recycling treatment, and when the rotation speed of the conductive roller internal electrode is set to a low speed, a smaller pressure can be applied. Deterioration due to friction on the surface of the internal electrode of the conductive roller due to the means can be reduced.

  Untreated carrier in which the suction flow rate of the treated carrier liquid sucked from the treated carrier liquid suction port provided in the cylindrical pipe-shaped external electrode is injected from the untreated carrier liquid inlet provided in the cylindrical pipe-shaped external electrode You may comprise so that it may always control more than the injection | pouring flow volume of a liquid.

  As a result, the pressure on the suction port side of the carrier channel formed by the external electrode and the internal electrode becomes lower than the pressure on the injection port side, so that the untreated carrier liquid provided on the cylindrical pipe-shaped external electrode The untreated carrier liquid injected from the injection port can be made to flow toward the suction port, which is opposite to the rotation direction of the conductive roller internal electrode.

  Bias current measuring means for measuring a current generated when a solid component in the untreated carrier liquid moves to the internal electrode side by a bias voltage applied between the external electrode and the internal electrode is provided. And a means for variably controlling the flow rate of the untreated carrier liquid injected from the untreated carrier liquid injection port provided on the outer electrode, and a means for variably controlling the rotation speed of the conductive roller internal electrode. May be.

  This detects a change in the value of the bias current flowing between the external electrode and the internal electrode due to the difference in the solid component concentration contained in the untreated carrier liquid collected from each printing member of the liquid developing electrophotographic apparatus. Therefore, the concentration of the solid component contained in the untreated carrier liquid injected into the carrier liquid recycling apparatus can be estimated from this current value. Based on the estimated solid component concentration in the untreated carrier liquid, the rotational speed of the conductive roller internal electrode necessary for recycling the untreated carrier liquid and the injection flow rate of the untreated carrier liquid are appropriately controlled to Even when the component concentration is high, the solid component can be completely removed from the treated carrier liquid.

  As a control method according to the solid component concentration in the untreated carrier liquid by the bias current measurement, only the injection flow rate of the untreated carrier liquid may be controlled to be variable according to the bias current, or the conductive roller internal electrode Only the rotation speed may be controlled to be variable according to the bias current.

  In addition, it is configured to have multiple rotation modes from low speed to high speed that rotate the inner electrode of the conductive roller at a constant rotation speed, and the upper limit current value and lower limit current value of the bias current are preset for each rotation mode. In the case where the measured bias current value is between the upper limit current value and the lower limit current value, control is performed so that the injection flow rate of the untreated carrier liquid is variably controlled in the rotation mode. If the upper limit current value or lower limit current value is exceeded even if the injection flow rate of the untreated carrier liquid is varied within the rotation mode, change to another rotation mode (if the upper limit current value is exceeded, switch to the high-speed side rotation mode). It may be configured to change to a low-speed rotation mode when the value is lower than the lower limit current value).

  As a result, the rotational speed of the conductive roller internal electrode can be changed according to the concentration of the solid component contained in the untreated carrier liquid injected into the carrier liquid recycling apparatus, and the injected untreated When the concentration of the solid component in the carrier liquid is high, the solid component can be completely removed from the untreated carrier liquid by using a high-speed rotation with a high solid component removal capability. When the concentration of solid components in the liquid is low, low-speed rotation with a low solid component removal capability allows sufficient solid component removal processing and reduces the amount of carrier liquid contained in the waste solid components to a small amount Thus, a highly efficient carrier liquid recycling process can be made possible.

  As a selection control of the rotation mode of the conductive roller internal electrode, when operating in a certain rotation mode, when controlling the injection flow rate of the untreated carrier liquid so that the bias current value is lower than the upper limit current value, If the injection flow rate satisfies the recycle processing amount required for the liquid development electrophotographic apparatus, control is performed so that the rotation mode is maintained. If the injection flow rate is less than the required recycle processing amount, the rotation mode is changed to the high speed side rotation mode. You may comprise so that it may control.

  In setting the lower limit current value of the bias current in each of the above rotation modes, the lower limit current value of the bias current in a certain rotation mode is set to be equal to or less than the upper limit current value and the optimum current value of the rotation mode at one stage lower than the rotation mode. You may make it set so that it may become.

  By setting the lower limit current value of the bias current in the rotation mode in this way, the injection flow rate of the untreated carrier liquid satisfies the processing amount necessary for the liquid developing electrophotographic apparatus while the recycling process is being executed in a certain rotation mode. When the bias current is lower than the lower limit current value and the rotation mode is changed to the one-step low-speed rotation mode, injection is performed by providing a margin before the upper limit current value of the bias current in the changed rotation mode. A subtle increase in the concentration of the untreated carrier liquid prevents the need to change to the one-step high-speed rotation mode again, and such rotation mode change processing is frequently performed due to subtle concentration differences in the untreated carrier liquid. Can be prevented.

  When the bias current value exceeds the predetermined upper limit current value, the injection of the untreated carrier liquid and the suction of the treated carrier liquid are stopped, the rotation of the conductive roller internal electrode, and the bias voltage between the external electrode and the internal electrode In this case, the injection of the untreated carrier liquid and the suction of the treated carrier liquid can be resumed when the bias current value falls below a predetermined current value below the upper limit current value. Good.

  As a result, an abnormality occurs in the printing process, the concentration of the solid component contained in the collected untreated carrier liquid is rapidly increased, and the process of removing the solid component from the untreated carrier liquid by the carrier liquid recycling apparatus is performed. It becomes possible to prevent the solid component from being mixed into the treated carrier liquid in time.

  The carrier liquid that has been treated by the carrier liquid recycling apparatus is again injected into the carrier liquid recycling apparatus, and the bias current value that flows due to a factor other than the factor due to the movement of the solid component in the carrier liquid is measured. The value is added to the upper limit current value and the lower limit current value used in the control of the rotation mode of the inner electrode of the conductive roller and the injection flow rate of the untreated carrier liquid described above, and the value after addition is the true upper limit current value. And you may comprise so that it may use for control as a minimum electric current value.

  As a factor of the bias current generated by applying an electric field force by applying a bias voltage to the carrier liquid, in the control of the rotation mode and the injection flow rate described above, only the current generated when the solid component moves to the internal electrode side is used. Although it has been considered, the carrier liquid contains a charged substance such as a dispersant in addition to the solid component, and more accurately by taking into account the current generated by the movement of the electric field force. The injection flow rate of the untreated carrier liquid and the rotation speed of the conductive roller internal electrode can be controlled in accordance with the concentration of the solid component contained in the carrier liquid.

  When the solid component concentration in the untreated carrier liquid is high and exceeds the solid component removal capability of the carrier liquid recycling apparatus, when the untreated carrier liquid is injected, the treated liquid treated by the carrier liquid recycling apparatus has been processed. You may comprise so that a carrier liquid may be mixed and inject | poured with an untreated carrier liquid.

  As a result, when a large amount of solid component is contained in the untreated carrier liquid, even if the conductive roller internal electrode is rotated at the highest speed, the solid component cannot be completely removed from the untreated carrier liquid. In this case, by mixing the treated carrier liquid with the untreated carrier liquid, the ratio of the solid components can be lowered, so that the untreated carrier liquid containing a large amount of the solid components can be recycled. Become.

  When the untreated carrier liquid is injected, as a means for mixing and injecting the treated carrier liquid, the mixing ratio of the untreated carrier liquid and the treated carrier liquid, and when the carrier liquid of the mixing ratio is injected The concentration of the solid component in the untreated carrier liquid is estimated from the value of the bias current and mixed with the untreated carrier liquid so that the solid component concentration in the untreated carrier liquid can be processed by the carrier liquid recycling apparatus. You may comprise so that the mixing flow volume of a used carrier liquid may be determined.

  Provided with solid component concentration measuring means for measuring the concentration of the solid component contained in the untreated carrier liquid before injecting the untreated carrier liquid from the untreated carrier liquid inlet provided on the cylindrical pipe-shaped external electrode The flow rate of the untreated carrier liquid that can be processed by the carrier liquid recycling device is calculated from the solid component concentration measured by the solid component concentration measuring means, and is included in the discarded solid component and discarded. The injection flow rate of the untreated carrier liquid and the rotation speed of the internal electrode may be determined by calculating the rotation speed of the conductive roller internal electrode that can minimize the loss of the carrier liquid caused by this.

  Accordingly, an untreated carrier liquid containing a large amount of the solid component is calculated by calculating an injection amount according to the concentration of the solid component contained in the untreated carrier liquid to be injected from the processing capacity of the carrier liquid recycling apparatus in advance. Can be prevented from being injected beyond the processing capacity, and a stable unprocessed carrier liquid can be recycled, and the amount of lost carrier liquid contained in the waste solid component can be reduced. The rotational speed of the conductive roller internal electrode can be determined so as to be minimized, and a highly efficient carrier liquid recycling process can be performed.

  A solid component detection unit configured to detect a solid component contained in the processed carrier liquid sucked from the suction port of the processed carrier liquid provided on the cylindrical pipe-shaped external electrode, and the solid component detection unit When it is detected that the solid component is contained in the treated carrier liquid, it is judged that the recycling process is defective, and the treated carrier liquid sucked from the suction port of the treated carrier liquid is again used as the carrier liquid recycling apparatus. A means for reinjecting the untreated carrier liquid may be provided.

  As a result, the solid component is completely removed from the untreated carrier liquid, and the solid component is completely detected from the carrier liquid by reliably detecting that the solid component has been mixed into the treated carrier liquid without being completely removed. Can be removed.

  When the solid component detection means provided in the treated carrier liquid suction port detects that the solid component is contained in the treated carrier liquid, the rotational speed of the conductive roller internal electrode is increased, and Alternatively, a process for reducing the injection flow rate of the untreated carrier liquid may be performed.

  This reduces the injection amount of the untreated carrier liquid having a solid component concentration in the untreated carrier liquid that exceeds the processing capacity of the carrier liquid recycling apparatus, and further recycles the carrier liquid by rotating the conductive roller internal electrode at a high speed. The ability of the apparatus to remove the solid component in the carrier liquid can be enhanced, and the occurrence of a recycling process failure in which the solid component is mixed into the treated carrier liquid can be prevented.

  A part or all of the cylindrical pipe-shaped external electrode is made of a transparent conductive material, and an untreated carrier is formed by an optical density sensor installed from the outside of the cylindrical pipe-shaped external electrode toward the carrier liquid flow path between the external electrode and the internal electrode. Detect a boundary position where the concentration is below a predetermined concentration at which it can be determined that the solid component in the liquid has been removed, and the unprocessed carrier liquid so that this boundary position is at a predetermined distance from the processed carrier liquid suction port. The injection flow rate and the rotational speed of the conductive roller internal electrode may be determined.

  Thereby, according to the concentration change of the solid component contained in the untreated carrier liquid injected into the carrier liquid recycling apparatus, the injection flow rate of the untreated carrier liquid injected into the carrier liquid recycling apparatus and the untreated carrier liquid The solid component in the untreated carrier liquid is removed at a predetermined position in the middle of the carrier liquid flow path of the carrier liquid recycling apparatus by changing the rotation speed of the internal electrode of the conductive roller that determines the solid component removal ability of the carrier liquid. It is possible to ensure that the process is completed, and it is possible to prevent the occurrence of a recycling process failure in which solid components are mixed in the processed carrier liquid.

  A part or all of the inner electrode of the conductive roller is made of a transparent conductive material, and an untreated carrier is formed by an optical density sensor installed from the inner side of the inner electrode of the conductive roller toward the carrier liquid flow path between the outer electrode and the inner electrode. An untreated carrier liquid is detected such that a boundary position that is equal to or lower than a predetermined concentration at which it can be determined that the solid component in the liquid has been removed is detected, and the boundary position is located at a predetermined distance from the treated carrier liquid suction port. The injection flow rate and the rotation speed of the conductive roller internal electrode may be determined.

  An ultrasonic sensor is installed in contact with the carrier liquid flow path between the external electrode and the internal electrode, and by measuring the solid component concentration of the carrier liquid flowing in the flow path with this ultrasonic sensor, Detecting a boundary position where the concentration is below a predetermined concentration at which it can be determined that the solid component has been removed, and the untreated carrier liquid injection flow rate so that this boundary position is a position that maintains a predetermined distance from the processed carrier liquid suction port The rotational speed of the conductive roller internal electrode may be determined.

  An ultrasonic sensor is installed between the inlet of the untreated carrier liquid provided on the cylindrical pipe-shaped external electrode and the discharge port of the waste solid component, and the solid component adhering to the surface of the conductive roller internal electrode is in front of the discharge port. The boundary position where the concentration of the solid component is equal to or higher than the predetermined concentration is detected by being deposited by the pressure means for removing the carrier liquid in the waste solid component at a predetermined distance from the untreated carrier liquid inlet. The pressure applied to the pressure means for removing the carrier liquid in the waste solid component, the rotational speed of the inner electrode of the conductive roller, and the injection flow rate of the untreated carrier liquid may be determined so that the position is maintained. Good.

  Thereby, the solid component exceeds the amount of the solid component discarded from the discharge port of the solid component and is deposited by the pressure means for removing the carrier liquid in the discarded solid component, and the external electrode and the internal electrode of the carrier liquid recycling apparatus It is possible to prevent solid components from accumulating in the carrier liquid flow path between them and affecting the recycling process of the carrier liquid.

  A forward blade with a light pressure is installed between the inlet of the untreated carrier liquid of the cylindrical pipe-shaped external electrode and the outlet of the waste solid component, and the pressure for removing the carrier liquid in the forward blade and the waste solid component is installed. Configured to include a means for measuring the pressure between the waste blade and the solid waste so that the pressure between the forward blade and the pressure means for removing the carrier liquid in the solid waste component does not exceed a predetermined pressure. You may comprise so that the pressurization applied to the pressurization means for carrier liquid removal in a component, the rotational speed of an internal electrode of an electroconductive roller, and the injection | pouring flow rate of an untreated carrier liquid may be determined.

  Also in this manner, the solid component is accumulated by the pressure means for removing the carrier liquid in the waste solid component exceeding the amount of the solid component discarded from the discharge port of the solid component in the same manner as described above. It is possible to prevent solid components from accumulating in the carrier liquid flow path between the external electrode and the internal electrode and affecting the recycling process of the carrier liquid.

  A typical embodiment according to the present invention will be described. In the following, the same portions are denoted by the same reference numerals, and detailed description may be omitted.

  As shown in FIG. 2, this carrier liquid recycling apparatus is a liquid developer containing a carrier liquid remaining on a printing member (photosensitive member, intermediate transfer member, etc.) without being used in the printing process of the liquid developing electrophotographic apparatus. Carrier liquid recycling that collects the agent and uses it as an untreated carrier liquid to recycle the carrier liquid by removing solid components (toner particles) contained in the untreated carrier liquid Device.

  As shown in FIG. 1, the carrier liquid recycling apparatus includes a cylindrical pipe-shaped external electrode 1 and a conductive roller internal electrode 2 with a predetermined gap therebetween, and the cylindrical pipe-shaped external electrode 1 includes An untreated carrier liquid injection port 3, a treated carrier liquid suction port 4, and a waste solid component discharge port 6 are provided, and the conductive roller internal electrode 2 has an untreated carrier liquid injection port 3 between the external electrode and the internal electrode. To the processed carrier liquid suction port 4 so as to rotate in the direction opposite to the direction in which the carrier liquid flows.

  As shown in FIG. 3, the untreated carrier liquid containing solid components used in the printing process is continuously injected from the untreated carrier liquid inlet 3 by a pump, and from the treated carrier liquid inlet 4 by a pump. By being sucked, the carrier liquid flow path, which is a gap between the external electrode and the internal electrode, is configured to flow from the untreated carrier liquid inlet 3 toward the treated carrier liquid inlet 4. By applying a bias voltage by the bias voltage applying means 7 between the external electrode and the internal electrode while flowing through the path, an electric field force is applied so that the solid component in the carrier liquid is pressed against the surface side of the internal electrode. ing.

  As a result, the solid component contained in the untreated carrier liquid is separated from the carrier liquid, adhered to the surface of the conductive roller internal electrode 2, and deposited to remove the solid component from the untreated carrier liquid. Yes.

  On the surface of the conductive roller internal electrode 2, a semi-conductive layer having a volume resistivity of 1 + E4 to 1 + E10 (Ω · cm), which is formed by heat sealing, painting, coating, dipping, tubing, rubber crosslinking, etc. By providing, a high bias voltage can be applied without generating a spark discharge between the external electrode and the internal electrode when the bias voltage is applied, and solid components attached to the surface of the internal electrode can be easily removed. It is good also as a structure.

  The solid component separated from the untreated carrier liquid and deposited on the surface of the conductive roller internal electrode 2 is carried to the waste solid component discharge port 6 of the cylindrical pipe-shaped external electrode 1 by the rotation of the conductive roller internal electrode 2. , It will be discharged out of the carrier liquid recycling device, but since the accumulated solid component contains a considerable amount of carrier liquid, if it is discharged as it is, it will be discarded up to a considerable amount of carrier liquid. Thus, the recycling efficiency of the carrier liquid is reduced.

  Therefore, the waste solid component for squeezing and removing the carrier liquid from the waste solid component by applying pressure to the surface of the conductive roller internal electrode 2 with an elastic body such as rubber before the waste solid component discharge port 6. The medium carrier liquid removing pressure applying means 5 is provided.

  The pressure means 5 for removing the carrier liquid in the waste solid component is pressed against the surface of the conductive roller internal electrode 2 to form a pressure nip, and the solid component adhered and deposited on the surface of the conductive roller internal electrode 2 Even if an attempt is made to pass through the nip portion due to the rotation of the conductive roller internal electrode 2, the conductive roller internal electrode 2 is prevented from passing by being blocked by the pressure of the nip portion in a state of containing a large amount of carrier liquid and having a low viscosity.

  The pressure means for removing the carrier liquid in the waste solid component from the solid component drawn into the nip portion by the rotation of the conductive roller internal electrode 2 by applying pressure on the surface side of the internal electrode by the pressure means. The carrier liquid is squeezed out by the pressure of 5 and can pass through the nip portion only after the viscosity becomes high, so that the carrier liquid is removed from the solid waste component.

  By applying an electric field force to the untreated carrier liquid, the solid component contained in the carrier liquid is deposited on the surface of the conductive roller internal electrode 2 so as to be separated and removed. The electric field force is weakened by the charge of the deposited solid component, and the solid component contained in the carrier liquid cannot be further separated and deposited.

  When the concentration of the solid component contained in the untreated carrier liquid is high, the conductive roller internal electrode 2 is rotated at a high speed in the direction opposite to the direction in which the carrier liquid flows, thereby providing a wider area where no solid component is deposited. The solid component can be completely removed from the untreated carrier liquid by bringing the inner electrode surface of the substrate into contact with the untreated carrier liquid and quickly discharging the deposited solid component from the waste solid component discharge port 6. At this time, the processing for squeezing out the carrier liquid from the waste solid component discharged from the waste solid component discharge port 6 by the pressure means 5 for removing the carrier liquid in the waste solid component becomes insufficient, and a considerable amount of the carrier liquid is discarded. there is a possibility.

  In order to prevent this, by increasing the pressure applied to the pressure means 5 for removing the carrier liquid in the waste solid component, it becomes possible to remove more carrier liquid contained in the waste solid component, Although it is possible to prevent a large amount of carrier liquid from being discarded, there is a problem in that if too much pressure is applied, the contact portion between the pressure application means and the internal electrode deteriorates due to friction, shortening the life of the internal electrode. Come out.

  Therefore, in this apparatus, the liquid developing electrophotographic apparatus secures a recycling amount of the carrier liquid necessary for continuously performing the printing process, and the solid component concentration contained in the untreated carrier liquid is low. In this case, the injection flow rate of the untreated carrier liquid and the rotation speed of the conductive roller internal electrode are reduced to prevent the solid component from being mixed into the treated carrier liquid, and to reduce the discarded carrier liquid as much as possible. By controlling the number of times the contact portion of the internal electrode is rubbed, the carrier liquid recycling apparatus can take out the high-purity carrier liquid from the untreated carrier liquid with high efficiency and extend the life of the internal electrode.

  In order to detect the change in the concentration of the solid component contained in the untreated carrier liquid injected into the carrier liquid recycling apparatus, a bias voltage is applied between the external electrode and the internal electrode by a bias voltage applying means 7 as shown in FIG. Bias current measuring means 8 for measuring the current value that flows when the solid component in the untreated carrier liquid moves to the inner electrode surface side when applied is provided.

  This means that when the value of the current that flows when a bias voltage is applied is large, it means that many solid components have moved due to the electric field force, so that the concentration of the solid components contained in the untreated carrier liquid is high. Judgment can be made.

  Therefore, when the value of the current that flows when a bias voltage is applied is large, the carrier liquid recycling apparatus is configured by reducing the flow rate of untreated carrier liquid and increasing the rotation speed of the conductive roller internal electrode. By increasing the removal capability of the solid component in the carrier liquid, it is possible to cope with the treatment of the untreated carrier liquid containing many solid components.

  Conversely, when the value of the current that flows when a bias voltage is applied is small, the injection flow rate of the untreated carrier liquid is increased so that more carrier liquid is recycled, and the conductive roller By reducing the rotation speed of the internal electrodes, the amount of discarded carrier liquid is reduced as much as possible so that highly efficient recycling processing can be performed.

  As a specific control means according to the value of the current flowing when the bias voltage is applied to the injection flow rate of the untreated carrier liquid and the rotation speed of the conductive roller internal electrode, the rotation speed of the conductive roller internal electrode is set as follows. It is configured to have a plurality of rotation modes from low speed to high speed rotating at a constant speed, and in each rotation mode, an upper limit current value and a lower limit current value of the rotation mode are set in advance, and an untreated carrier liquid The injection flow rate may be varied within a predetermined range within the rotation mode, and the injection flow rate may be controlled so that the current value generated by applying the bias voltage is within the upper limit current value and the lower limit current value.

  In this case, the upper limit current value exceeds the upper limit current value by setting the current value to flow when a bias voltage is applied when the maximum amount of solid components that can be separated in the rotation mode is injected into the carrier liquid recycling apparatus. By controlling the injection flow rate of the untreated carrier liquid and the rotation speed of the inner electrode of the conductive roller so as not to occur, the occurrence of a recycling process failure in which solid components are mixed in the treated carrier liquid is prevented.

  The lower limit current value is included in the untreated carrier liquid injected into the carrier liquid recycling apparatus by setting the lower limit current value to be equal to or less than the upper limit current value and the optimum current value of the rotation mode one step lower than the rotation mode. When the solid component concentration decreases and the rotation mode is changed to the one-stage low-speed rotation mode, a margin is provided between the rotation mode and the upper limit current value, so that the rotation mode can be changed due to subtle changes in the solid component concentration. The repetition of the rotation mode changing operation of returning to the high-speed side rotation mode again is prevented.

  Hereinafter, a control example in the case of configuring as a carrier liquid recycling apparatus having three rotation modes of a low speed mode, a medium speed mode, and a high speed mode will be described.

  When the carrier liquid recycling apparatus is started, as shown in FIG. 4, it starts from the high speed mode. The injection flow rate of the untreated carrier liquid is set to the minimum flow rate, the concentration of the solid component contained in the untreated carrier liquid is estimated from the current value at this time, and the injection flow rate is increased so that the optimum current value is obtained. Go.

  As shown in FIG. 5, even if the injection flow rate is increased to the maximum flow rate in the high-speed mode, the current value may not reach the lower limit current value if the concentration of the solid component contained in the untreated carrier liquid is low. . In this case, although the solid component removal capability is one step lower, the amount of the carrier liquid contained in the waste solid component can be reduced, and the medium speed mode is changed to enable more efficient recycling.

  Similarly to the above, in the medium speed mode, the flow rate is increased from the minimum flow rate, and the injection flow rate is controlled so that the current value becomes the optimum current value. As shown in FIG. The flow rate satisfies the recyclable amount of the carrier liquid required for the liquid developing electrophotographic apparatus, and the current value at this time is between the lower limit current value and the upper limit current value, preferably the optimum current value (solid component of the carrier liquid recycle apparatus) In the range that does not exceed the removal capability, the rotation mode is controlled so that the rotation mode is maintained.

  If the concentration of solid components contained in the untreated carrier liquid is further reduced, and the injection flow rate is maximized and falls below the lower limit current value in the medium speed mode, it operates in the low speed mode on the lower speed side as described above. The amount of the carrier liquid contained in the waste solid component is discarded, and the highly efficient recycling process can be performed.

  Conversely, the concentration of solid components contained in the untreated carrier liquid increases, and as shown in FIG. 7, the flow rate of untreated carrier liquid must be reduced below the recycle processing amount necessary for a liquid developing electrophotographic apparatus. When the current value cannot be lowered below the upper limit current value, control is performed so that the mode is changed to the one-stage high-speed mode having a high solid component removal capability.

  In this way, it has multiple rotation modes that rotate the rotation speed of the conductive roller internal electrode at a constant rotation speed such as low speed mode, medium speed mode, high speed mode, etc. Even if the concentration of solid components contained in the untreated carrier liquid changes, the optimal control corresponding to this can be achieved by variably controlling the rotation mode so that it falls within the preset upper limit current value and lower limit current value. The carrier liquid recycling process can be performed.

  Here, as an example, an example in which a three-stage rotation mode including a low-speed mode, a medium-speed mode, and a high-speed mode is shown. However, as the rotation mode, a rotation mode with more detailed multi-stage rotation speeds is provided. By configuring, it is possible to select a more appropriate rotation mode in accordance with the change in the concentration of the solid component contained in the untreated carrier liquid, and to enable highly efficient recycling processing.

  In the case of a change in the concentration of the untreated carrier liquid collected by the normal printing process, there is no problem in controlling the rotation mode of the conductive roller internal electrode and the injection flow rate of the untreated carrier liquid as described above. If any abnormality occurs in the device and the toner image remains on the photoconductor or intermediate transfer member without being used at all, and this has been recovered as an untreated carrier liquid, it is included in the untreated carrier liquid. In some cases, the concentration of the solid component is rapidly increased.

  When such an untreated carrier liquid containing a large amount of solid components is injected into the carrier liquid recycling apparatus, it is not enough to change to the high-speed rotation mode or to reduce the amount of untreated carrier liquid injected. The solid component contained in the processing carrier liquid cannot be completely removed, and a recycling process defect mixed in the processed carrier liquid occurs.

  Therefore, as shown in FIG. 8, when an untreated carrier liquid containing a large amount of solid components is injected into the carrier liquid recycling apparatus, the current value due to application of a bias voltage exceeds the upper limit current value of the rotation mode. In this case, by stopping the injection of the untreated carrier liquid from the inlet and the suction of the processed carrier liquid from the inlet, and maintaining the rotation of the conductive roller internal electrode and the application of the bias voltage, the current value becomes the upper limit. It may be configured to wait for the current value to decrease to a predetermined restart current value equal to or lower than the current value, and to resume the injection of the untreated carrier liquid and the suction of the processed carrier liquid when the current value becomes lower than the predetermined restart current value. Good.

  By performing the recovery operation from such irregular high-concentration solid component injection, even if the solid component concentration in the untreated carrier liquid suddenly increases, the treated carrier liquid containing the solid component is recovered. Solid component adheres and accumulates on the surface of the rotating conductive roller internal electrode without being sucked from the suction port by the electric field force due to the bias voltage, and the solid component is discarded from the discharge port by rotation of the conductive roller internal electrode. By configuring so as to resume the injection of the untreated carrier liquid and the suction of the treated carrier liquid after the amount of solid components that can be processed is reached, the occurrence of a recycling process failure can be prevented.

  As described above, by measuring the current value generated by applying a bias voltage between the external electrode and the internal electrode, the concentration of the solid component contained in the injected untreated carrier liquid is estimated, and the conductive roller internal electrode The rotation mode and the injection flow rate of the untreated carrier liquid are controlled, but the current value generated by applying a bias voltage between the external electrode and the internal electrode is when the solid component contained in the untreated carrier liquid moves. In addition to the generated current, there may be included a current generated by the movement of a liquid semiconductive material such as a dispersant contained in the untreated carrier liquid. If the control is performed without taking the above into consideration, the concentration of the solid component cannot be estimated accurately, resulting in a decrease in the processing capacity of the carrier liquid recycling apparatus. Agents can adversely affect to development by being contained in a large amount in the carrier liquid.

  Therefore, in this apparatus, the treated carrier liquid is again injected into the carrier liquid recycling apparatus, and the treated carrier liquid is reprocessed in each rotation mode, thereby biasing the treated carrier liquid containing no solid component. The current value generated when a voltage is applied is measured, and the current value flowing by a liquid semiconductive material other than the solid component is measured, and this is measured with the rotation mode of the conductive roller internal electrode and the untreated carrier liquid. The upper limit current value and the lower limit current value in the control of the injection flow rate are added, and the upper limit current value and the lower limit current value after the addition are controlled as the true upper limit current value and the lower limit current value.

  If the concentration of the solid component contained in the untreated carrier liquid is very high and exceeds the solid component removal capability of the carrier liquid recycling apparatus, the untreated carrier liquid is injected as it is, and the solid component is removed from the untreated carrier liquid. It is necessary to carry out irregular processing such as recovery operation to prevent this from occurring due to the occurrence of a recycling process failure in which the solid component is mixed into the processed carrier liquid without being removed, reducing the efficiency of the recycling process. May end up.

  In this apparatus, when the concentration of the solid component contained in such an untreated carrier liquid exceeds the solid component removal capability of the carrier liquid recycling apparatus, as shown in FIG. The treated carrier liquid is mixed when the untreated carrier liquid injecting means 9 injects the untreated carrier liquid into the carrier liquid recycling apparatus, and the treated carrier liquid can be injected after reducing the concentration of the solid component. You may comprise so that the carrier liquid mixing means 12 may be provided.

  The treated carrier liquid mixing means 12 is provided with a check valve 13 for preventing the untreated carrier liquid from flowing back into the treated carrier liquid tank 11 when the treated carrier liquid is mixed with the untreated carrier liquid. You may do it.

  In the treated carrier liquid mixing means 12, the concentration of the solid component contained in the untreated carrier liquid is estimated from the mixing ratio of the untreated carrier liquid and the treated carrier liquid and the current value flowing by applying the bias voltage at that time, and recycled. You may comprise so that the mixing flow volume of the processed carrier liquid required for a process may be determined.

  In the carrier liquid recycling device, the optimal recycling according to the concentration is achieved by variably controlling the injection flow rate of the untreated carrier liquid and the rotation speed of the conductive roller internal electrode according to the solid component concentration contained in the untreated carrier liquid. As a means for measuring the concentration of the solid component contained in the untreated carrier liquid, in addition to the means for measuring the current value generated by applying the bias voltage as described above, the following can be performed. You may comprise so that a simple means may be provided.

  As shown in FIG. 10, before injecting the untreated carrier liquid from the untreated carrier liquid injection port provided in the cylindrical pipe-shaped external electrode, the concentration of the solid component contained in the untreated carrier liquid to be injected is measured. You may comprise so that the solid component density | concentration measurement means 15 to be provided may be provided.

  Based on the solid component concentration information in the untreated carrier liquid by the solid component concentration measuring means 15, the printer controller 17 that controls the carrier liquid recycling apparatus controls the pump 16 that injects and sucks the carrier liquid. By controlling the injection flow rate of the untreated carrier liquid and controlling the rotation speed of the internal electrode of the conductive roller, an appropriate untreated carrier according to the concentration of the solid component contained in the untreated carrier liquid You may enable it to select the injection | pouring flow volume of a liquid, and the rotational speed of an electroconductive roller internal electrode.

  As the solid component concentration measuring means, as shown in FIG. 11, an AC voltage generated by an AC voltage generator 18 is applied to the untreated carrier liquid before the untreated carrier liquid is injected into the carrier liquid recycling apparatus. The solid component concentration may be measured by passing between the planar electrodes 20 and measuring the moving current of the solid component flowing between the electrodes with the current monitor 19.

  A part or all of the untreated carrier liquid transport tube for transporting the untreated carrier liquid to the untreated carrier liquid injection port provided in the carrier liquid recycling apparatus is constituted by a transparent tube, as shown in FIG. Thus, you may comprise so that the solid component density | concentration contained in an untreated carrier liquid may be measured using an optical density sensor.

  In this case, as shown in FIG. 12A, the light emitting element 22 and the light receiving element 23 are installed so as to sandwich the carrier liquid transporting transparent tube 21, and the light irradiated from the light emitting element 22 transmits the untreated carrier liquid. By measuring the amount with the light receiving element 23, it may be configured as a transmission type for measuring the concentration of solid components contained in the untreated carrier liquid, or as shown in FIG. The light emitting element 22, the light receiving element 23, and the light reflector 24 are installed so as to sandwich the tube 21, and the light irradiated from the light emitting element 22 toward the light reflector 24 is reflected by the light reflector 24 and is in the untreated carrier liquid. Alternatively, the light-receiving element 23 may be used to measure the amount of light transmitted through the light-receiving element 23 so as to measure the solid component concentration contained in the untreated carrier liquid.

  When the concentration of the solid component in the untreated carrier liquid is high, the light irradiated from the light emitting element cannot pass through the untreated carrier liquid at all, so the concentration cannot be measured by the optical density sensor. Therefore, as shown in FIG. 13, an ultrasonic sensor oscillator 25 and a receiver 26 are installed so as to be in contact with the untreated carrier liquid transport tube, and the ultrasonic wave emitted from the oscillator 25 causes ultrasonic waves in the untreated carrier liquid. By oscillating the solid component and measuring the damped vibration after the ultrasonic wave from the oscillator 25 is stopped by the receiver 26, the solid component concentration in the untreated carrier liquid is measured according to the length of time until the vibration converges. You may comprise.

  By measuring the concentration of the solid component contained in the untreated carrier liquid and controlling the amount of untreated carrier liquid injected into the carrier liquid recycling apparatus, or by controlling the rotation speed of the conductive roller internal electrode, Recycling failure due to mixing of solid components in the treated carrier liquid is prevented, but the solid components may be mixed into the treated carrier liquid without being removed due to a very rapid concentration change. There is.

  Therefore, in the present apparatus, as shown in FIG. 14, it is possible to detect whether or not a solid component is contained in the treated carrier liquid sucked from the treated carrier liquid suction port 4 provided in the cylindrical pipe-shaped external electrode. The solid component detection means 27 is provided, and when it is detected that the solid component is contained in the processed carrier liquid, the processed carrier liquid sucked from the processed carrier liquid suction port 4 is again unremoved. The treatment carrier liquid may be configured to have means for reinjecting into the carrier liquid recycling apparatus.

  As the solid component detecting means, the same means as the means for measuring the solid component concentration in the carrier liquid shown in FIGS. 11, 12, and 13 is used, and no solid component is mixed in the treated carrier liquid. To detect.

  In FIG. 14, when the solid component detection means 27 detects that the processed carrier liquid contains a solid component, the printer controller 17 sucks the processed carrier liquid from the processed carrier liquid suction port 4. The switching valve 28 that can be switched to transport the carrier liquid to the untreated carrier liquid tank 14 instead of the treated carrier liquid tank 11 is controlled, and the treated carrier liquid containing the solid component is transferred to the untreated carrier liquid tank 14 side. An example in the case of being configured to be conveyed is shown.

  Thereby, the untreated carrier liquid exceeding the solid component concentration that can be processed by the carrier liquid recycling apparatus was injected, and the solid component was contained in the treated carrier liquid without completely removing the solid component from the untreated carrier liquid. By reliably detecting the state of recycle processing failure that remains, injecting the treated carrier liquid containing solid components into the device again and removing the solid components from the carrier liquid, Even when an untreated carrier liquid having a concentration exceeding a possible solid component concentration is injected, the solid component is completely removed from the carrier liquid so that only a pure carrier liquid can be extracted.

  As shown in FIG. 15, when the solid component detecting means 27 provided in the processed carrier liquid suction port 4 detects that a solid component is contained in the sucked processed carrier liquid, The switching valve 28 is controlled so that the treated carrier liquid containing the components is conveyed to the untreated carrier liquid tank 14, and the rotational speed of the conductive roller internal electrode is increased to reduce the injection flow rate of the untreated carrier liquid. You may comprise so that a process may be performed.

  As a result, the amount of solid components injected into the carrier liquid recycling device is reduced, the rotational speed of the conductive roller internal electrode is increased, and the processing capability is improved by separating and removing the solid components from the carrier liquid. You may make it possible to prevent more reliably the generation | occurrence | production of the recycling process defect in which a solid component remains contained in a carrier liquid.

  In order to prevent a recycling process failure in which a solid component is mixed into the treated carrier liquid, a predetermined position of the carrier liquid flow path between the external electrode and the internal electrode (a predetermined distance from the suction port of the treated carrier liquid). It is only necessary to control so that the solid component is removed from the untreated carrier liquid at a position just before this.

  Therefore, as shown in FIG. 16, part or all of the cylindrical pipe-shaped external electrode is made of a transparent conductive material, and is installed from the outside of the cylindrical pipe-shaped external electrode toward the carrier liquid flow path between the external electrode and the internal electrode. The optical density sensor 29 detects a boundary position that is equal to or lower than a predetermined concentration at which it can be determined that the solid component in the untreated carrier liquid has been removed, and this boundary position maintains a predetermined distance from the processed carrier liquid suction port 4. The injection flow rate of the untreated carrier liquid and the rotation speed of the inner electrode of the conductive roller may be determined so as to be in the predetermined positions.

  As shown in FIG. 17, a part or all of the conductive roller internal electrode is made of a transparent conductive material, and is installed from the inside of the conductive roller internal electrode toward the carrier liquid flow path between the external electrode and the internal electrode. A position at which the concentration sensor 29 detects a boundary position that is equal to or lower than a predetermined concentration at which it can be determined that the solid component in the untreated carrier liquid has been removed, and the boundary position is a position at a predetermined distance from the processed carrier liquid suction port 4. The injection flow rate of the untreated carrier liquid and the rotation speed of the conductive roller internal electrode may be determined so as to be.

  As shown in FIG. 18, an ultrasonic sensor 30 is installed so as to be in contact with the carrier liquid flow path between the external electrode and the internal electrode, and the solid component concentration of the carrier liquid flowing in the flow path is measured by the ultrasonic sensor 30. Thus, the boundary position where the solid concentration contained in the untreated carrier liquid is determined to be equal to or lower than a predetermined concentration at which it can be determined that the solid component has been removed is detected, and the boundary position is maintained at a predetermined distance from the processed carrier liquid suction port 4 The injection flow rate of the untreated carrier liquid and the rotation speed of the conductive roller internal electrode may be determined so as to be.

  The solid component separated from the untreated carrier liquid and deposited on the surface of the conductive roller internal electrode is transported to the solid component discharge port and discarded as the conductive roller internal electrode rotates. In order to remove the carrier liquid contained in the solid component before disposal, it is dammed by the pressure means for removing the carrier liquid in the waste solid component, and a large amount of solid component is deposited before the discharge port.

  When the solid component that has been blocked is transported more than the discharged solid component and is accumulated beyond the untreated carrier liquid inlet, the solid component blocks the carrier liquid flow path. Therefore, there is a possibility that the solid content removal process cannot be executed normally.

  Therefore, in this apparatus, as shown in FIG. 19, an ultrasonic sensor 30 is provided between the untreated carrier liquid inlet 3 provided on the cylindrical pipe-shaped external electrode and the pressure means 5 for removing the carrier liquid in the waste solid component. Install and measure the solid component concentration contained in the carrier liquid to detect the boundary position where the solid component concentration in the vicinity of the waste solid component outlet is equal to or higher than the predetermined concentration. The pressure applied to the non-pressure means for removing the carrier liquid in the waste solid component, the injection flow rate of the untreated carrier liquid, and the rotation speed of the inner electrode of the conductive roller are determined so as to be at a predetermined distance from the inlet 3. You may comprise as follows.

  Specifically, when the above-described means detects a situation in which the waste solid component accumulates near the untreated carrier liquid inlet, the pressure applied to the pressure means for removing the carrier liquid in the waste solid component In order to reduce the amount of solid components injected into the device by reducing the amount of solid components that can be discharged and reducing the injection flow rate of the untreated carrier liquid, Control is performed so as to reduce the amount of the solid component deposited before the pressure means for removing the carrier liquid.

  As shown in FIG. 20, between the untreated carrier liquid inlet 3 provided in the cylindrical pipe-shaped external electrode and the pressure means 5 for removing the carrier liquid in the waste solid component, light pressure is applied to the surface of the conductive roller internal electrode. And a pressure measuring means 31 for measuring the pressure between the light pressure forward blade and the pressure means for removing the carrier liquid in the waste solid component. The pressure applied to the pressure means 5 for removing the carrier liquid in the waste solid component and untreated so that the pressure between the direction blade 32 and the pressure means 5 for removing the carrier liquid in the waste solid component does not exceed a predetermined pressure. By configuring the carrier liquid injection flow rate and the rotational speed of the conductive roller internal electrode to determine the boundary position with the above ultrasonic sensor, the solid solution is passed beyond the untreated carrier liquid injection port. Ingredients It may be able to prevent the going to the product.

It is a block diagram of the present invention. It is a block diagram of the carrier liquid recycling apparatus in a liquid development electrophotographic apparatus. It is explanatory drawing of the solid component removal process in a carrier liquid. It is process explanatory drawing at the time of starting. It is processing explanatory drawing when a solid component density | concentration is low. It is processing explanatory drawing in the case of being settled in a suitable bias current value. It is processing explanatory drawing when an upper limit electric current value is exceeded. It is recovery processing explanatory drawing when an upper limit electric current value is exceeded. It is explanatory drawing in the case of mixing and inject | pouring a processed carrier liquid. It is explanatory drawing in the case of measuring a solid component density | concentration before un-processed carrier liquid injection | pouring. It is explanatory drawing at the time of utilizing electroconductivity as a solid component density | concentration measuring means. It is explanatory drawing of the example which uses the optical density sensor as a solid component density | concentration measuring means. It is explanatory drawing of the example which uses the ultrasonic sensor as a solid component density | concentration measurement means. It is explanatory drawing of the recovery process Example 1 at the time of recycling process defect generation | occurrence | production. It is explanatory drawing of the recovery process Example 2 at the time of recycling process defect generation | occurrence | production. It is the structural example 1 which calculates | requires a solid component removal boundary with an optical density sensor. It is the structural example 2 which calculates | requires a solid component removal boundary with an optical density sensor. It is a structural example which calculates | requires a solid component removal boundary with an ultrasonic sensor. It is an example of a structure in the case of measuring the accumulation amount of a waste solid component with an ultrasonic sensor. It is an example of a structure in the case of measuring the accumulation amount of a waste solid component with a pressure sensor. It is explanatory drawing of the conventional carrier liquid recycling apparatus.

Explanation of symbols

1: cylindrical pipe-shaped external electrode 2: conductive roller internal electrode 3: untreated carrier liquid injection port 4: treated carrier liquid suction port 5: pressure means for removing carrier liquid in waste solid component 6: waste solid component discharge port 7: Bias voltage applying means 8: Bias current measuring means 9: Untreated carrier liquid injection means 10: Treated carrier liquid suction means 11: Treated carrier liquid tank 12: Treated carrier liquid mixing means 13: Check valve 14: Untreated carrier liquid tank 15: Solid component concentration measuring means 16: Pump 17: Printer controller 18: AC voltage generator 19: Current monitor 20: Planar electrode 21: Transparent tube for carrying carrier liquid 22: Light emitting element 23: Light receiving element 24 : Light reflector 25: Oscillator 26: Receiver 27: Solid component detection means 28: Switching valve 29: Optical density sensor 30: Wave sensor 31: pressure measuring means 32: Forward blade

Claims (12)

An untreated carrier liquid injection port and a treated carrier liquid suction port are used in a carrier liquid recycling apparatus for recycling used carrier liquid in a liquid developing electrophotographic apparatus that uses a non-volatile high viscosity liquid developer as a developer. And a cylindrical pipe-shaped external electrode provided with a discharge port for discharging a solid component separated from the untreated carrier liquid, and a predetermined gap in the cylindrical pipe-shaped external electrode. A conductive roller internal electrode that rotates in a direction opposite to the flow of the carrier liquid from the inlet to the treated carrier liquid suction port, means for applying a bias voltage between the external electrode and the internal electrode, and a cylindrical pipe-shaped external electrode Means for variably controlling the injection amount of the untreated carrier liquid from the untreated carrier liquid injection port provided on the surface, and variably controlling the rotation speed of the inner electrode of the conductive roller. In the carrier liquid recycle and means,
A current measuring means for measuring a current flowing between the electrodes when a bias voltage is applied between the cylindrical pipe-shaped external electrode and the conductive roller internal electrode;
The solid component concentration in the injected untreated carrier liquid is estimated from the current value between the cylindrical pipe-shaped outer electrode and the conductive roller inner electrode measured by the current measuring means, and can be processed by the carrier liquid recycling apparatus. Necessary to calculate the amount of untreated carrier liquid injected from the untreated carrier liquid inlet provided in the cylindrical pipe-shaped external electrode by calculating the untreated carrier liquid, or to process with the carrier liquid recycling device By calculating the rotational speed of the conductive roller internal electrode, the rotational speed of the conductive roller internal electrode is determined.
A carrier liquid recycling apparatus characterized by that. In the carrier liquid recycling apparatus according to claim 1,
As variable control of the rotation speed of the conductive roller internal electrode, it has multiple rotation modes from low speed to high speed rotating at a constant rotation speed,
In each rotation mode, the lower limit current value and the upper limit current value of the current value between the cylindrical pipe-shaped outer electrode and the conductive roller inner electrode are set in advance,
The injection amount of untreated carrier liquid and the rotation mode are determined by the relationship between the current value measured by the current measuring means between the cylindrical pipe-shaped outer electrode and the conductive roller inner electrode, and the lower limit current value and the upper limit current value.
A carrier liquid recycling apparatus characterized by that. In the carrier liquid recycling apparatus according to claim 2,
In each rotation mode of the conductive roller internal electrode, the lower limit current value set in advance for the current value between the cylindrical pipe-shaped external electrode and the conductive roller internal electrode is the upper limit of the rotation mode one step lower than the rotation mode. Set to be less than the current value and the optimal current value,
A carrier liquid recycling apparatus characterized by that. In the carrier liquid recycling apparatus according to claim 1,
When the current value between the cylindrical pipe-shaped external electrode measured by the current measuring means and the conductive roller internal electrode exceeds a predetermined upper limit current value, the untreated carrier liquid is injected and the treated carrier liquid is sucked. When the current value between the cylindrical pipe-shaped external electrode and the conductive roller internal electrode falls to a predetermined value below the upper limit current value by stopping and maintaining the rotation of the conductive roller internal electrode and the application of the bias voltage. , Restart the injection of the untreated carrier liquid and the suction of the treated carrier liquid,
A carrier liquid recycling apparatus characterized by that. In the carrier liquid recycling apparatus according to claim 2,
The treated carrier liquid was reinjected into the carrier liquid recycling apparatus, and the current value flowing between the cylindrical pipe-shaped outer electrode and the conductive roller inner electrode was measured by factors other than the solid component contained in the carrier liquid. The value obtained by adding the current value to the predetermined upper limit current value and lower limit current value set in advance in each rotation mode is set as the true upper limit current value and lower limit current value. Used to control the rotation mode,
A carrier liquid recycling apparatus characterized by that. In the carrier liquid recycling apparatus according to claim 1,
When injecting the untreated carrier liquid from the untreated carrier liquid injection port provided in the cylindrical pipe-shaped external electrode, it comprises means for mixing and injecting the treated carrier liquid.
A carrier liquid recycling apparatus characterized by that. In the carrier liquid recycling apparatus according to claim 6 ,
When injecting the untreated carrier liquid, the injection flow rate of the treated carrier liquid mixed with the untreated carrier liquid by means of mixing and injecting the treated carrier liquid is the mixing ratio of the untreated carrier liquid and the treated carrier liquid. Determined from the current value between the cylindrical pipe-shaped external electrode and the conductive roller internal electrode,
A carrier liquid recycling apparatus characterized by that. An untreated carrier liquid injection port and a treated carrier liquid suction port are used in a carrier liquid recycling apparatus for recycling used carrier liquid in a liquid developing electrophotographic apparatus that uses a non-volatile high viscosity liquid developer as a developer. And a cylindrical pipe-shaped external electrode provided with a discharge port for discharging a solid component separated from the untreated carrier liquid, and a predetermined gap in the cylindrical pipe-shaped external electrode. A conductive roller internal electrode that rotates in a direction opposite to the flow of the carrier liquid from the inlet to the treated carrier liquid suction port, means for applying a bias voltage between the external electrode and the internal electrode, and a cylindrical pipe-shaped external electrode Means for variably controlling the injection amount of the untreated carrier liquid from the untreated carrier liquid injection port provided on the surface, and variably controlling the rotation speed of the inner electrode of the conductive roller. In the carrier liquid recycle and means,
Comprising solid component concentration measuring means for measuring the solid component concentration of the untreated carrier liquid injected from the untreated carrier liquid injection port provided in the cylindrical pipe-shaped external electrode before injection;
Determine the untreated carrier liquid injection flow rate and the rotational speed of the conductive roller internal electrode from the solid component concentration of the untreated carrier liquid measured by the solid component concentration measuring means,
A carrier liquid recycling apparatus characterized by that. An untreated carrier liquid injection port and a treated carrier liquid suction port are used in a carrier liquid recycling apparatus for recycling used carrier liquid in a liquid developing electrophotographic apparatus that uses a non-volatile high viscosity liquid developer as a developer. And a cylindrical pipe-shaped external electrode provided with a discharge port for discharging a solid component separated from the untreated carrier liquid, and a predetermined gap in the cylindrical pipe-shaped external electrode. A conductive roller internal electrode that rotates in a direction opposite to the flow of the carrier liquid from the inlet to the treated carrier liquid suction port, means for applying a bias voltage between the external electrode and the internal electrode, and a cylindrical pipe-shaped external electrode Means for variably controlling the amount of untreated carrier liquid injected from the untreated carrier liquid injection port provided on the substrate, and variably controlling the rotational speed of the conductive roller internal electrode. In the carrier liquid recycle and means,
Solid component detection means for detecting whether or not a solid component is contained in the treated carrier liquid sucked from the treated carrier liquid suction port provided in the cylindrical pipe-shaped external electrode;
When the solid component is contained in the treated carrier liquid by the solid component detection means, the solid carrier detection means comprises a means for reprocessing the treated carrier liquid as an untreated carrier liquid again as a recycling failure.
A carrier liquid recycling apparatus characterized by that. In the carrier liquid recycling apparatus according to claim 9 ,
When the solid component detection means detects that a solid component is contained in the treated carrier liquid, a process of increasing the rotation speed of the conductive roller internal electrode and decreasing the injection flow rate of the untreated carrier liquid is performed. ,
A carrier liquid recycling apparatus characterized by that. An untreated carrier liquid injection port and a treated carrier liquid suction port are used in a carrier liquid recycling apparatus for recycling used carrier liquid in a liquid developing electrophotographic apparatus that uses a non-volatile high viscosity liquid developer as a developer. And a cylindrical pipe-shaped external electrode provided with a discharge port for discharging a solid component separated from the untreated carrier liquid, and a predetermined gap in the cylindrical pipe-shaped external electrode. A conductive roller internal electrode that rotates in a direction opposite to the flow of the carrier liquid from the inlet to the treated carrier liquid suction port, means for applying a bias voltage between the external electrode and the internal electrode, and a cylindrical pipe-shaped external electrode Means for variably controlling the amount of untreated carrier liquid injected from the untreated carrier liquid injection port provided on the substrate, and variably controlling the rotational speed of the conductive roller internal electrode. In the carrier liquid recycle and means,
At the solid component discharge port of the cylindrical pipe-shaped external electrode, pressure is applied to the conductive roller internal electrode surface side with an elastic body to remove the carrier liquid component in the waste solid component. With means,
Furthermore, an ultrasonic sensor is installed between the untreated carrier liquid injection port of the cylindrical pipe-shaped external electrode and the discharge port of the waste solid component, and the concentration of the solid component is increased to a predetermined concentration or more by deposition on the surface of the conductive roller internal electrode. The pressure applied to the pressure means for removing the carrier liquid in the waste solid component and the rotation of the roller internal electrode so that the boundary position is located at a predetermined distance from the untreated carrier liquid inlet. Determine the velocity, the flow rate of injection from the untreated carrier liquid inlet,
A carrier liquid recycling apparatus characterized by that. An untreated carrier liquid injection port and a treated carrier liquid suction port are used in a carrier liquid recycling apparatus for recycling used carrier liquid in a liquid developing electrophotographic apparatus that uses a non-volatile high viscosity liquid developer as a developer. And a cylindrical pipe-shaped external electrode provided with a discharge port for discharging a solid component separated from the untreated carrier liquid, and a predetermined gap in the cylindrical pipe-shaped external electrode. A conductive roller internal electrode that rotates in a direction opposite to the flow of the carrier liquid from the inlet to the treated carrier liquid suction port, means for applying a bias voltage between the external electrode and the internal electrode, and a cylindrical pipe-shaped external electrode Means for variably controlling the injection amount of the untreated carrier liquid from the untreated carrier liquid injection port provided on the surface, and variably controlling the rotation speed of the inner electrode of the conductive roller. In the carrier liquid recycle and means,
At the solid component discharge port of the cylindrical pipe-shaped external electrode, pressure is applied to the conductive roller internal electrode surface side with an elastic body to remove the carrier liquid component in the waste solid component. With means,
Furthermore, a forward blade with light pressure applied to the inner electrode side of the conductive roller is installed between the untreated carrier liquid inlet of the cylindrical pipe-shaped external electrode and the discharge port of the waste solid component, and the light pressure is applied. Means for measuring the pressure between the forward blade and the pressure means for removing the carrier liquid in the waste solid component,
The pressure of the pressure means for removing the carrier liquid in the waste solid component and the inside of the conductive roller so that the pressure between the forward blade and the pressure means for removing the carrier liquid in the waste solid component does not exceed a predetermined pressure. Determine the rotational speed of the electrode, the injection flow rate from the untreated carrier liquid injection port,
A carrier liquid recycling apparatus characterized by that.