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. 12, 2013
Filed:
Jul. 31, 2008
Shigeo Aoyagi, Moriya, JP;
Shigeo Aoyagi, Moriya, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
An image forming apparatus which is capable of suppressing damages to a plurality of photosensitive drums and an intermediate transfer belt, and reducing loads on drive sources of the photosensitive drums and the intermediate transfer belt, during control for making the respective rotational phases of the photosensitive drums in phase. The intermediate transfer belt is driven for rotation in a state in contact with the photosensitive drums. Sensors detect the rotational speeds of the photosensitive drums and the intermediate transfer belt. Control sections control the rotational speeds and rotational phases of the photosensitive drums based on the results of detections by the sensors. When each control section performs rotational phase control, a limiter thereof limits the speed difference between the associated photosensitive drum and the intermediate transfer belt when the speed difference exceeds a predetermined range.