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:
Aug. 10, 2010
Filed:
Mar. 26, 2007
Hiroki Takayanagi, Abiko, JP;
Hiroki Takayanagi, Abiko, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image forming apparatus includes an image bearing member, a rotatable transfer roller, a contact separation unit, a driving force transmission portion, a cleaning member, and a control portion. The cleaning member cleans the transfer roller in: (i) a first mode in which the transfer roller rotates with a first peripheral velocity difference while the transfer roller is in contact with the image bearing member, and (ii) a second mode in which the transfer roller rotates with a second peripheral velocity difference while the transfer roller is separated from the image bearing member. The control portion controls a voltage applied to the cleaning member such that a value of the voltage in the first mode or the second mode, which has a smaller peripheral velocity difference between the first peripheral velocity difference and the second peripheral velocity difference, is smaller than the value of the voltage in the other mode.