Patent ID: 7043170

Claim:
An image forming apparatus for forming a toner image on a sheet, said apparatus comprising: a photoreceptor holding said toner image; an intermediate transfer member rotatable at a speed; a primary transfer device facilitating primary transfer of said toner image from said photoreceptor onto said intermediate transfer member, wherein completion of said primary transfer occurring during a primary rotation of said intermediate transfer member; a secondary transfer device facilitating secondary transfer of said toner image from said intermediate transfer member onto said sheet; a controller controlling said intermediate transfer member; wherein said controller controls said intermediate transfer member to rotate at a first speed during said primary transfer; wherein for a predetermined sheet, said controller determines, based on an image formation mode, during which rotation of said intermediate transfer member, including said primary rotation and a following rotation following said primary rotation, to change the speed of said intermediate transfer member from said first speed to a second speed, and wherein the image formation mode includes number of images on an entire loop of the intermediate transfer member.