Abstract: An image forming apparatus comprises an image bearing member on which a latent image is formed, a plurality of developing devices for developing the latent image, each of the developing devices containing developer, and a turnable turning member on which the plurality of developing devices are mounted. The turning member is caused to turn based on a turn history of the turning member.

Abstract: An image forming apparatus comprises an image bearing member on which a latent image is formed, a plurality of developing devices for developing the latent image, each of the developing devices containing developer, and a turnable turning member on which the plurality of developing devices are mounted. The turning member is caused to turn based on a turn history of the turning member.

Abstract: A color image forming apparatus has a plurality of developing devices. Each developing device has developer that includes a predetermined ratio, in volume of developer particles having a diameter of a predetermined value or less, with respect to an entire volume of toner. Each developing device is capable of developing a latent image using the developer. A color image is formed by successively performing development operations so as to superimpose different kinds of developer.

Abstract: In an image forming apparatus, a patch image is formed on the surface of a belt-like image support for supporting a toner image on the surface and is detected with a patch sensor placed facing a placing part on a roller for stretching the belt-like image support. An angle adjustment mechanism for adjusting the attachment angle of the patch sensor rotates the patch sensor with an intersection point of an optical axis of the patch sensor and a sensing face as the center for adjusting the attachment angle of the patch sensor. The patch sensor is attached to one member forming a part of a support frame of the image support and the attachment angle of the member is adjusted, whereby the attachment angle of the patch sensor is adjusted.

Abstract: An image formation apparatus includes a cleaning device capable of coming into and out of contact with the front surface of a toner image carrier which rotates with toner images adhering on its front surface, and for removing toners adherent on the front surface of the toner image carrier during the contact. A toner reception portion is disposed on a downstream side than the contact position between the cleaning device and the toner image carrier as viewed in the moving direction of the front surface of the toner image carrier, and it is partitioned into a plurality of chambers by a partition plate which extends in a direction substantially orthogonal to the moving direction of the front surface of the toner image carrier.

Abstract: An image forming apparatus with an image bearing member on which a latent image is formed, with a plurality of developing devices for developing the latent image, each of the developing devices containing developer, and with a turnable turning member on which the plurality of developing devices are mounted. The turning member is caused to turn based on a turn history of the turning member.

Abstract: A recording medium carrier system of an image forming apparatus is constituted by independent units as a paper supply cassette, a paper feed unit, a transfer unit, a fixing unit, and a paper ejecting unit. An intermediate transfer unit in the transfer unit is provided with an intermediate transfer belt to which a toner image formed on a photoconductive drum is primarily transferred at a primary transfer position and which secondarily transfers the toner image on a recording medium at a secondary transfer position, and a driving roller for circulating the intermediate transfer belt. The primary transfer position is arranged close to the driving roller.

Abstract: An image forming apparatus comprises an image bearing member on which a latent image is formed, a plurality of developing devices for developing the latent image, each of the developing devices containing developer, and a turnable turning member on which the plurality of developing devices are mounted. The turning member is caused to turn based on a turn history of the turning member.

Abstract: An image forming apparatus comprises: a latent image carrier which carries an electrostatic latent image; a developing unit which visualizes with toner the electrostatic latent image carried by the latent image carrier and forms a toner image; an intermediate transfer medium to which the toner image is transferred from the latent image carrier and which rotates and transports the toner image to a predetermined transfer position and transfers the toner image to a recording medium; a cleaner which abuts on the surface of the intermediate transfer medium and removes toner which adheres to the surface of the intermediate transfer medium after the transfer to the recording medium; and a controller which, assuming that the direction which is orthogonal to the travel direction in which the intermediate transfer medium moves is a width direction, executes toner accumulating processing during which predetermined toner images are formed as end patch images in end areas of the surface of the intermediate transfer medium

Abstract: A transfer device includes a pair of transfer frames, a belt member, a pair of transfer roller levers which are respectively arranged on inner sides of the transfer frames pivotably, a transfer roller which is provided between first ends of the transfer roller levers rotatably, a pair of first urging members, which are respectively provided on second ends of the transfer roller levers to energize the transfer roller toward the belt member and a pair of transfer pressure controlling members which are respectively provided on the transfer frames movably to control urging power of the first urging members.

Abstract: A transfer device includes a pair of transfer frames, a belt member, a pair of transfer roller levers which are respectively arranged on inner sides of the transfer frames pivotably, a transfer roller which is provided between first ends of the transfer roller levers rotatably, a pair of first urging members, which are respectively provided on second ends of the transfer roller levers to energize the transfer roller toward the belt member, and a pair of transfer pressure controlling members which are respectively provided on the transfer frames movably to control urging power of the first urging members.

Abstract: A cleaning blade is arranged such that a tip end thereof is brought into contact with a toner image carrying member in an upwardly directed state, to scrape off residual toner from the toner image carrying member. A casing body defines a waste toner chamber accommodating the scraped toner therein. The casing body is formed with an air passage communicated to an exterior of the casing body, so that an air stream is created within the waste toner chamber.

Abstract: The first invention is characterized that, in a transfer device of an image forming apparatus, charge removing cloth (27) is integrally attached to an attraction plate (26) for separating a transfer medium after transfer. The second invention is characterized in that, in image forming apparatus in which a transfer bias is applied between a transfer roller (15) and an intermediate transfer medium (5) by a constant-current control means (50), a leak member (40) is arranged in the vicinity of the transfer roller (15) to allow current to leak from the transfer roller to the leak member.

Abstract: A recording medium carrier system of an image forming apparatus is constituted by independent units as a paper supply cassette, a paper feed unit, a transfer unit, a fixing unit, and a paper ejecting unit. An intermediate transfer unit in the transfer unit is provided with an intermediate transfer belt to which a toner image formed on a photoconductive drum is primarily transferred at a primary transfer position and which secondarily transfers the toner image on a recording medium at a secondary transfer position, and a driving roller for circulating the intermediate transfer belt. The primary transfer position is arranged close to the driving roller.

Abstract: An image forming apparatus has a transfer part for transferring a toner image from an intermediate transfer belt whose surface is white to a recording medium. An outer cover for forming a part of a transport path of the recording medium is openable and closeable. A paper-guide cover for covering the intermediate transfer belt and guiding a recording medium passing through the transfer part is provided and is openable and closeable. When the outer cover is opened, the paper-guide cover covers the intermediate transfer belt.

Abstract: In an image forming apparatus, a patch image is formed on the surface of a belt-like image support for supporting a toner image on the surface and is detected with a patch sensor placed facing a placing part on a roller for stretching the belt-like image support. An angle adjustment mechanism for adjusting the attachment angle of the patch sensor rotates the patch sensor with an intersection point of an optical axis of the patch sensor and a sensing face as the center for adjusting the attachment angle of the patch sensor. The patch sensor is attached to one member forming a part of a support frame of the image support and the attachment angle of the member is adjusted, whereby the attachment angle of the patch sensor is adjusted.

Abstract: An image formation apparatus includes a cleaning device capable of coming into and out of contact with the front surface of a toner image carrier which rotates with toner images adhering on its front surface, and for removing toners adherent on the front surface of the toner image carrier during the contact. A toner reception portion is disposed on a downstream side than the contact position between the cleaning device and the toner image carrier as viewed in the moving direction of the front surface of the toner image carrier, and it is partitioned into a plurality of chambers by a partition plate which extends in a direction substantially orthogonal to the moving direction of the front surface of the toner image carrier.

Abstract: A recording medium carrier system of an image forming apparatus is constituted by independent units as a paper supply cassette, a paper feed unit, a transfer unit, a fixing unit, and a paper ejecting unit. An intermediate transfer unit in the transfer unit is provided with an intermediate transfer belt to which a toner image formed on a photoconductive drum is primarily transferred at a primary transfer position and which secondarily transfers the toner image on a recording medium at a secondary transfer position, and a driving roller for circulating the intermediate transfer belt. The primary transfer position is arranged close to the driving roller.

Abstract: A transfer device includes a pair of transfer frames, a belt member, a pair of transfer roller levers which are respectively arranged on inner sides of the transfer frames pivotably, a transfer roller which is provided between first ends of the transfer roller levers rotatably, a pair of first urging members, which are respectively provided on second ends of the transfer roller levers to energize the transfer roller toward the belt member, and a pair of transfer pressure controlling members which are respectively provided on the transfer frames movably to control urging power of the first urging members.

Abstract: The first invention is characterized that, in a transfer device of an image forming apparatus, charge removing cloth (27) is integrally attached to an attraction plate (26) for separating a transfer medium after transfer. The second invention is characterized in that, in image forming apparatus in which a transfer bias is applied between a transfer roller (15) and an intermediate transfer medium (5) by a constant-current control means (50), a leak member (40) is arranged in the vicinity of the transfer roller (15) to allow current to leak from the transfer roller to the leak member.