Process cartridge having plural developing units and image formi

Details Process cartridge having plural developing units and image formi Process cartridge having plural developing units and image formi

1992-03-02

1994-01-04

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355210, 355245, 355326, G03G 1500, G03G 1501

Patent

active

052764796

ABSTRACT:
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.

REFERENCES:
patent: 4500195 (1985-02-01), Hosono
patent: 4933718 (1990-06-01), Furuya
patent: 5099278 (1992-03-01), Sato

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