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. 02, 1990
Filed:
Jun. 10, 1988
Akiyoshi Iwamasa, Zama, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A developing device includes a developing agent holding vessel; and a developing roller having a rotating non-magnetic sleeve and a magnetic roller which is surrounded by the sleeve and has magnetic poles. A blade is disposed at an outlet of the vessel and a stirring roller stirs the developing agent which includes a toner and a carrier in the vessel. The developing roller is provided with a moving mechanism for shifting the position of the magnetic pole of the magnetic roller, wherein one of the magnetic poles is facing a surface of a photosensitive drum during normal use of the developing agent, and no magnetic pole faces the photosensitive surface during a replacement of the developing agent.