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:
Dec. 20, 2011
Filed:
Jan. 29, 2009
Hiroki Ohkubo, Yokohama, JP;
Hiromichi Matsuda, Isehara, JP;
Toshiyuki Andoh, Sagamihara, JP;
Yuji Matsuda, Inagi, JP;
Yuichiro Ueda, Zama, JP;
Kazuhiko Kobayashi, Tokyo, JP;
Takuya Uehara, Tokyo, JP;
Takuya Murata, Tokyo, JP;
Hiroki Ohkubo, Yokohama, JP;
Hiromichi Matsuda, Isehara, JP;
Toshiyuki Andoh, Sagamihara, JP;
Yuji Matsuda, Inagi, JP;
Yuichiro Ueda, Zama, JP;
Kazuhiko Kobayashi, Tokyo, JP;
Takuya Uehara, Tokyo, JP;
Takuya Murata, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A belt drive control unit controls a rotation of belt supported by first and second rollers. Each of rotations of the first and second rollers are detected as first and second results. A rotation of the first roller is controlled in connection with thickness fluctuation in the belt using the first and second results. The belt drive control unit includes a sampling data acquisition unit, a correction value generator, a correction value storage, and a correction value reading controller. The sampling data acquisition unit obtains sampling data by sampling a difference value between the first and second results. The correction value generator generates correction value data for the belt based on the sampling data. The correction value storage stores the correction value data. The correction value reading controller reads the correction value data based on a rotation number of the belt to control a rotation of the first roller.