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:
Sep. 03, 1991
Filed:
Mar. 05, 1990
Applicant:
Inventor:
Yukio Nishio, Tama, JP;
Assignee:
Fujitsu Ltd., Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
355245 ; 355200 ; 74 96 ;
Abstract
In an image forming apparatus, a mechanism is provided between an upper frame and a lower frame, rotatably connected to each other so that the upper frame can be opened for separating a developing unit in the upper frame, closely united with an image forming drum in the upper frame when the developing unit operates, from the image forming drum so as to have a gap as wide as that the developing unit and/or a drum unit including the image forming drum can be mounted or demounted without damaging a cylindrical surface of the image forming drum, when the upper frame is opened for exchanging the drum unit and/or the developing unit.