Patent ID: 7773907
Filing Date: 2010-08-10
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image bearing member which bears a toner image; a rotatable transfer roller which is grounded and forms a transfer portion to transfer the toner image formed on the image bearing member onto a recording material; a contact separation unit which brings the transfer roller into contact with the image bearing member and separates the transfer roller from the image bearing member; a driving force transmission portion which transmits a driving force to the transfer roller at least while the transfer roller is separated from the image bearing member; a cleaning member for removing toner adhering to the transfer roller by contacting with the transfer roller when the transfer roller is in contact with and separated from the image bearing member, wherein the cleaning member cleans the transfer roller in: a control portion which controls a voltage applied to the cleaning member such that a value of the voltage applied to the cleaning member 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 applied to the cleaning member in the other mode.