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:
Nov. 23, 1999
Filed:
Mar. 17, 1998
Taizo Nozawa, Kanagawa-ken, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A developing device using developer and an image carrier has of a developing roller to carry developer, to feed developer to image carriers and to form a developer image. The developing device also has an upper mixer screw, which conveys, developer to the developing roller while stirring it, and a lower mixer screw provided under the upper mixer screw, which circulates and conveys developer jointly with the upper mixer also, the developing device has a drawing up roller with first and second magnetic poles formed to draw up developer when the lower mixer screw feeds developer to the upper mixer screw. The drawing up roller has magnetic matter provided in contact with the drawing up roller so as to form an angle 90.degree. or below to the horizontal line passing through the center of axis of the developing roller between the first and second magnetic poles so that developer which is drawn up by the drawing up roller, separates so that it is re-circulated by the upper mixer screw.