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:
Mar. 10, 2009
Filed:
Oct. 06, 2006
Yoshinobu Takeyama, Kanagawa, JP;
Yoshinobu Takeyama, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus of the present invention includes a plurality of belt position sensors adapted to sense the position of an intermediate image transfer belt in a direction perpendicular to the direction of movement of the belt each. The belt position sensors are located between rollers over which the intermediate image transfer belt is passed at positions different from each other in the plane of the belt in the direction of movement. A displacement calculator produces a difference between sensed values output by the belt position sensors at a plurality of desired belt positions of the intermediate image transfer belt and sequentially adds the differences to a difference between sensed values output from the belt position sensors at belt positions different from the above desired belt positions for thereby determining a displacement of the belt in the direction perpendicular to the direction of movement of the belt.