Mehrfarbige Entwicklungsvorrichtung für ein Bildaufzeichnungsgerät.

摘要

A multi-color developing device for an image forming apparatus comprising: a first developing unit (31) retractable with respect to a photosensitive drum (20); a second developing unit (32) adjacent to the first developing unit and retractable with respect to the photosensitive drum; a cam mechanism (37) for bringing either one of the first or second developing units to a position remote from the photosensitive drum when the other one, either the first or second developing units is positioned adjacent to the photosensitive drum; a pair of driving gears (66,166) provided between the first and second developing units for receiving power to drive the respective developing units; a first joint gear (64) which engages one of the driving gears (66) to transmit power to the first developing unit; a second joint gear (164) which engages the other one of the driving gears (166) to transmit power to the second developing unit; a first joint member (66) which rotatably supports the first joint gear (64) and which moves the first joint gear to the position to engage with or disengage from the corresponding driving gear (66) in synchronization with the moving of the first developing unit (32) close to or away from the photosensitive drum (20); and a second joint member (163) which rotatably supports the second joint gear (164) and which moves the second joint gear to the position to engage with or disengage from the corresponding driving gear (166) in synchronization with the moving of the second developing (32) unit close to or away from the photosensitive drum (20).