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:
Oct. 16, 2012
Filed:
Sep. 09, 2010
Masato Kobayashi, Kanagawa, JP;
Nobuyuki Satoh, Kanagawa, JP;
Norikazu Taki, Kanagawa, JP;
Tatsuhiko Okada, Saitama, JP;
Daisuke Sawada, Saitama, JP;
Daisaku Horikawa, Saitama, JP;
Masato Kobayashi, Kanagawa, JP;
Nobuyuki Satoh, Kanagawa, JP;
Norikazu Taki, Kanagawa, JP;
Tatsuhiko Okada, Saitama, JP;
Daisuke Sawada, Saitama, JP;
Daisaku Horikawa, Saitama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A conveying distance control device includes a conveying roller; a first detecting unit detecting rotational positions of the conveying roller; a line sensor sequentially detecting marks arranged on a test chart; a calculation unit, and a control unit. The calculation unit calculates a skew angle between a line passing through positions of a first mark and a second mark and a conveying direction of the conveying roller. The control unit obtains conveying distance errors indicating differences between corrected conveying distances not including errors caused by the skew angle and theoretical conveying distance of the marks in association with the rotational positions of the conveying roller, calculates a correction value for correcting a conveying distance of the conveying roller based on relationships between the conveying distance errors and the rotational positions of the conveying roller, and controls the conveying distance of the conveying roller based on the correction value.