Patent ID: 8600255
Filing Date: 2013-12-03
Classification: G03G

Abstract:
1. An image forming device that performs an image forming operation in either one of a color mode for forming a color image with developers of a plurality of colors including black and a monochrome mode for forming a monochrome image with black developer, comprising: a plurality of photosensitive members for the respective colors; a plurality of developing rollers, each configured to supply the developer to the corresponding photosensitive member to form a visible image on the photosensitive member; an endless bearing member disposed in confrontation with the plurality of photosensitive members; a plurality of collecting members, each configured to collect excrescences from the corresponding photosensitive member, the excrescences clinging on the photosensitive members after the visible images are transferred away from the photosensitive members; a reverse-transfer member that performs a reverse-transfer operation to transfer the excrescences collected by the collecting members back onto the photosensitive members and further onto the endless bearing member; and a control unit configured to control the reverse-transfer member to perform the reverse-transfer operation at a frequency when the image forming operations are performed in succession in the monochrome mode, the control unit setting the frequency based on an image forming condition.