Patent ID: 8682189
Filing Date: 2014-03-25
Classification: G03G

Abstract:
1. An image transfer system comprising: an image bearer to bear an image to be transferred onto a recording medium; an opposed member opposed to the image bearer to form a transfer nip therebetween, said opposed member having a contact surface contacting the recording medium at the transfer nip; a pressing device to apply pressure to the transfer nip; an engaging and disengaging device to engage and disengage the contact surface of the opposed member from a surface of the image bearer; and a transfer bias device to apply an image transfer bias transferring the image from the image bearer to the recording medium conveyed and pinched at the transfer nip, wherein said engaging and disengaging device disengages the contact surface of the opposed member from the surface of the image bearer to make a gap therebetween when an adjustment pattern is formed on a portion of the image bearer corresponding to an interval between recording mediums successively conveyed through the transfer nip and passes therethrough, wherein said transfer bias device applies a different bias than the image transfer bias between the image bearer and opposed member when the adjustment pattern passes therebetween, wherein said engaging and disengaging device includes: a cam having at least two different diameter portions changing a size of the gap when rotated; a cam driving device to rotate and stop the cam; and a cam controller to control the cam driving device, said cam controller controls the cam driving device to rotate and stop the cam at a first rotation angular position minimizing the gap when the adjustment pattern passes therethrough.