摘要:
A developing device, process cartridge, and image forming apparatus that use ETH development, and are capable of forming good multi-color images with a simple construction, and are capable of preventing the dispersal of powder. The developing device is for developing latent images on a latent image carrying member by applying powder to the latent image carrying member, and comprises: a transport member disposed in opposition to the latent image carrying member and having a plurality of transport electrodes that generate a progressive wave electric field to move the powder; a voltage supply device for applying a multi-phase voltage to the transport electrodes; and a transport member surface potential determination device for determining the surface potential of the transport member. The voltage supply device in the developing device according to the present invention applies a multi-phase voltage to the transport electrodes so that the surface potential on the transport member is between the potential of the image portions and the potential of the non-image portions of the latent image carrying member.
摘要:
A development device includes an open-ended housing, a rotatable roller, an array of multiple primary electrodes, a voltage source, a sealing member, and a secondary electrode. The housing accommodates toner for application to the photoconductive surface through an end opening thereof. The roller has an outer circumferential surface to deliver the toner from within the housing to a development zone. The array of multiple primary electrodes are aligned with each other on the roller surface. The voltage source applies a periodic pulse voltage to at least a subset of the primary electrodes to generate an oscillating primary electric field. The sealing member seals clearance between the roller surface and an edge of the end opening downstream from the development zone. The secondary electrode generates a secondary electric field to force the toner from the sealing member toward the roller surface to prevent premature removal of the toner.
摘要:
A powder transferring apparatus provided with a powder electrostatic transferring device includes a plurality of transferring electrodes configured to generate an electric field for transferring the powder by an electrostatic force including a powder transferring amount detecting device to detect an amount of powder on a surface of the powder electrostatic transferring device.
摘要:
A developing device constituted to be capable of reliably making toner flare, and carrying out developing normally in the developing area, by preventing toner from adhering to the toner carrier. A developing device having a toner carrier which is disposed in opposition to a latent image carrier and which carries toner for developing an electrostatic latent image on the latent image carrier, the developing device including: a plurality of electrodes aligned at a predetermined interval within the toner carrier; voltage application means for applying a voltage to the electrodes so that the electric field between the plurality of electrodes varies with time, wherein the electric field between the electrodes causes the toner on the toner carrier to hop and form a cloud; and a toner adhesion prevention member that is provided upstream of a developing area where the latent image carrier is in opposition to the toner carrier and that prevents adhesion of toner to the toner carrier. According to the developing device, it is possible to prevent toner from adhering to the toner carrier, and it is possible to make the toner flare reliably.
摘要:
An image forming apparatus is capable of specifying the type of an occurring abnormality to a certain extent while avoiding the increasingly complicated control that is caused when a plurality of abnormalities is detected individually according to the presence of their respective causes. A normal group data set, which is a collection of normal value combinations relating to grouped information constituted by a plurality of information of differing types, is stored in RAM or ROM serving as information storage device of a control unit. At least two or more sets of grouped information, including first grouped information constituted by a plurality of different types of information, and second grouped information constituted by a plurality of information in a different combination to that of the first grouped information, are obtained from the RAM, the ROM, various sensors, and an operation display unit.
摘要:
A charging device includes a case that surrounds a charging unit and has plural ventilating sections, a gas separating unit that varies a component ratio of the air near an opposed portion of a photosensitive member and the charging unit, and a gas electrolyzing unit that electrolyzes moisture of the area near the opposed portion. The gas separating unit has a nitrogen enriching unit that includes a nitrogen enriching film set in a ventilating section and a pressurizing chamber for forming a pressure difference between the inside and the outside of the case and supplies a nitrogen enriched air to the inside of the case or an oxygen enriching unit that includes an oxygen enriching film set in another ventilating section and a depressurizing chamber for forming a pressure difference between the inside and the outside of the case and exhausts an oxygen enriched air to the outside of the case.
摘要:
A disclosed development device includes: a latent image carrier; a conveying member disposed so as to face the latent image carrier, the conveying member having plural electrodes insulated from one another and arranged at predetermined intervals so as to generate an electric field for moving toner on the conveying member; a voltage application unit applying a voltage of n phases (n is a positive integer not less than one) to the electrodes so as to form a cloud of the toner and the toner is adhered to the latent image carrier so as to form a visualized toner image; a toner supply unit supplying the toner to the conveying member; and a height adjusting member adjusting a uniform height for a toner layer of the toner immediately before a development area on the conveying member in which development is performed.
摘要:
An image forming apparatus is capable of specifying the type of an occurring abnormality to a certain extent while avoiding the increasingly complicated control that is cause when a plurality of abnormalities is detected individually according to the presence of their respective causes. A normal group data set, which is a collection of normal value combination relating to grouped information constituted by a plurality of information of differing types, is stored in RAM or ROM serving as information storage device of a control unit. At least two or more sets of grouped information, including first grouped information constituted by a plurality of different types of information, and second grouped information constituted by a plurality of information in a different combination to that of the first grouped information, are obtained from the RAM, the ROM, various sensors, and an operation display unit.
摘要:
A powder transferring apparatus provided with a powder electrostatic transferring device includes a plurality of transferring electrodes configured to generate an electric field for transferring the powder by an electrostatic force including a powder transferring amount detecting device to detect an amount of powder on a surface of the powder electrostatic transferring device.
摘要:
An image forming apparatus having a developing apparatus using a development system in which toner is moved by means of a traveling wave electric field. The image forming apparatus comprises a plurality of developing apparatuses having toner conveyance members which convey toner by means of a phase-shift electric field created by voltages of n phases applied to a plurality of electrodes, to a region opposing an image carrier on which an electrostatic latent image is formed; and a voltage application device which applies a voltage having an average potential value between the potential of the image portions of the latent image on the image carrier and the non-image portions of same, to the electrodes of the toner conveyance members of the respective developing apparatuses.