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. 07, 2006
Filed:
Jul. 29, 2004
Applicant:
Yoshihiro Sakai, Tokyo, JP;
Inventor:
Yoshihiro Sakai, Tokyo, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G03G 15/01 (2006.01); G03G 15/00 (2006.01); B41J 2/385 (2006.01); G01D 15/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
A belt device includes a belt as an endless belt that has a scale with a large number of scale marks formed along the whole circumference of the belt. A sensor reads the scale to obtain scale information. A control device provides control to correct a belt speed, based on scale information read. A scale-mark degradation determining unit determines whether the scale mark is degraded. A belt drive controller continuously provides control to correct the belt speed for a degraded portion until the scale-mark degradation determining unit determines that there is no degradation.