| 摘要 |
A process cartridge suitable for use in a multi-color image forming apparatus has an image carrier such as an electrophotosensitive drum, a plurality of developing units which act on the image carrier to form developed images of different colors, and a developing unit change-over device for performing change-over between the developing units so as to put one of the developing units into an operative state. The developing unit change-over device is controlled in accordance with a signal from a sensor mounted in the body of the image forming apparatus that senses the state of the developing unit change-over device. The image forming apparatus which operates with the process cartridge has a mounting structure for mounting the process cartridge, a driving device for driving the developing unit change-over device in the process cartridge mounted on the mounting structure, a sensor for sensing the state of the developing unit change-over device in the process cartridge mounted on the mounting structure, and a control device for controlling the operation of the developing unit change-over device in accordance with a signal output from the sensor.
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