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. 27, 2001
Filed:
May. 11, 2000
Yasuhiro Funayama, Tokyo, JP;
Tsutomu Uezono, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A drive roller is rotated and a high voltage periodically alternating between plus and minus based on the potential of a conductive portion of the drive roller,is applied by a high voltage power source,to an electric charger, so that the surface of the drive roller,is charged plus and minus alternately. Since the drive roller,is charged, a sleeve,is absorbed to and held by the drive roller,so as to be rotated and fed together with the drive roller. Moreover, the sleeve,is separated from the drive roller,by a separator so as to obtain a sag. When the drive roller rotates further, the sleeve,is again absorbed to and held by the drive roller,charged periodically plus and minus, so as to be rotated together with the drive roller. Thus, the present invention eliminates scratches which may be caused by friction on a developing roller or on a photosensitive body surface and also eliminates contamination with oil.