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:
Apr. 18, 1978
Filed:
Jun. 07, 1977
Applicant:
Inventors:
Ryuzo Okada, Ebina, JA;
Yoshikazu Okamoto, Ebina, JA;
Assignee:
Rank Xerox, Ltd., London, EN;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
118658 ;
Abstract
An improved magnetic brush developing device mounted adjacent to a photosensitive member has a magnet and a cylinder mounted to rotate around the periphery of the magnet. The magnet is stationary during operation of the device, but the magnet is mounted so that its position relative to the photosensitive member can be changed each time a predetermined number of copies has been made. This arrangement solves two problems caused by developer which has deteriorated from use, the problems being (1) poor reproduction of a low contrast image, and (2) staining the background of an image.