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:
Jul. 21, 1992
Filed:
Nov. 13, 1990
Yutaka Koizumi, Yokohama, JP;
Kenichi Mizuma, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus having an image carrier for forming an electrostatic latent image thereon, and a plurality of developing units each facing the image carrier and movable toward and away from the image carrier. A developing roller driving mechanism serves two different functions at the same time, i.e., causing any of the developing units to move between a developing and a non-developing position and driving the developing roller associated with the developing unit. When the developing roller driving mechanism is operated, the developing unit is moved to the developing position in the event of development and to the non-developing position in the event of non-development.