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. 10, 2013
Filed:
Feb. 18, 2011
Takashi Hiratsuka, Tokorozawa, JP;
Shinji Yamamoto, Kawasaki, JP;
Yasumi Yoshida, Yokohama, JP;
Toshihiro Fukasaka, Kawasaki, JP;
Tadashi Matsumoto, Tokyo, JP;
Sumitoshi Sotome, Yachiyo, JP;
Takashi Hiratsuka, Tokorozawa, JP;
Shinji Yamamoto, Kawasaki, JP;
Yasumi Yoshida, Yokohama, JP;
Toshihiro Fukasaka, Kawasaki, JP;
Tadashi Matsumoto, Tokyo, JP;
Sumitoshi Sotome, Yachiyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image forming apparatus includes a rotatable belt member; an image forming station; first and second detecting members for detecting widthwise positions of the belt member; first and second steering rollers for correcting the widthwise positions of the belt member by inclination; a control portion configured to control inclinations of the first and second steering rollers on the basis of an output of the first or second detecting member; a first executing portion configured to execute, in a period other than an image formation period, an operation in a correction mode of, in a state that the first steering roller is at a first reference inclination, controlling the second steering roller to correct a second reference inclination of the second steering roller; and a second executing portion configured to execute, in a period other than that of the correction mode operation, an operation in a control mode of controlling the first and second steering rollers on the basis of the first and second reference inclinations.