The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 1994
Filed:
Mar. 02, 1992
Mitsugu Inomata, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
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.