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. 15, 2011
Filed:
May. 22, 2008
Toshiyuki Andoh, Kanagawa, JP;
Hiromichi Matsuda, Kanagawa, JP;
Satoru Tao, Ibaraki, JP;
Noritaka Masuda, Ibaraki, JP;
Yuji Uozaki, Ibaraki, JP;
Yuichi Hirose, Kanagawa, JP;
Toshiyuki Andoh, Kanagawa, JP;
Hiromichi Matsuda, Kanagawa, JP;
Satoru Tao, Ibaraki, JP;
Noritaka Masuda, Ibaraki, JP;
Yuji Uozaki, Ibaraki, JP;
Yuichi Hirose, Kanagawa, JP;
Ricoh Company, Limited, Tokyo, JP;
Abstract
A control unit calculates a difference between a displacement of a belt detected by an encoder and a predetermined target value, calculates a pulse frequency of a driving pulse signal based on a feedback control based on the difference and a feed-forward control based on a reference driving pulse frequency, sets a control range of the feedback control to be equal to or smaller than a frequency of one rotation of a driven roller, and controls driving of a pulse motor such that the belt moves at a constant speed.