Kyocera Document Solutions Inc.

Ryosuke Kimura

Takahisa Nakaue

An image forming apparatus includes an image forming unit, a transfer member, a density detection device, and a control unit. The image forming unit includes an image carrier, a charging device, an exposing device, and a developing device. The control unit is capable of executing a calibration mode to correct density of a toner image. When the calibration mode is executed, a datum image is formed by the developing device, a developing voltage is adjusted on the basis of density of the datum image detected by the density detection device, and a transfer voltage is adjusted on the basis of the adjusted developing voltage.

Image forming apparatus

An image forming apparatus includes a plurality of image forming portions, an intermediate transfer belt, a plurality of primary transfer members, a belt cleaning device, a secondary transfer member, a voltage application device, an image density sensor, and a control section, and executes calibration based on a result of detection by the image density sensor. The control section is capable of executing a cleaning assist mode in which, at the time of executing the calibration, a part of patch images on the intermediate transfer belt is transferred to the secondary transfer member. In a case of forming a toner image on the intermediate transfer belt after one belt revolution, the control section executes the cleaning assist mode, and in a case of not forming the toner image after one belt revolution, the control section continuously applies a reverse transfer voltage to the secondary transfer member.

An image forming apparatus includes a plurality of image carriers, an intermediate transfer body, a plurality of primary transfer members, a secondary transfer member, a first guide member, and a controller. The first guide member guides a recording medium along a conveying direction. The controller controls a primary transfer bias and a secondary transfer bias. A plurality of the primary transfer members include an upstream side primary transfer member and a downstream side primary transfer member. The controller makes an absolute value of the primary transfer bias applied to the downstream side primary transfer member larger than an absolute value of the primary transfer bias applied to the upstream side primary transfer member. The controller lowers an absolute value of the secondary transfer bias when the recording medium separates from the first guide member.

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Osaka, Japan

Ryosuke Kimura