Patent ID: 9557689
Date: 2017-01-31
CPC Classifications: G03G

Claim:
1. An image forming apparatus comprising: an intermediate transfer belt onto which toner images formed on a plurality of image carriers are transferred; a plurality of belt rollers including a driving roller that causes the intermediate transfer belt to run, and extending rollers on and between which the intermediate transfer belt is extended; a plurality of transfer rollers holding the intermediate transfer belt between the transfer rollers and the respective image carriers; a cleaning member disposed in contact with a surface of the intermediate transfer belt; a first driving portion capable of causing the respective transfer rollers to come into contact with or separate from the intermediate transfer belt; a second driving portion capable of changing orientation of predetermined one or a plurality of movable rollers among the plurality of belt rollers; and a running control portion configured to execute a running process including: causing the first driving portion to separate the respective transfer rollers from the intermediate transfer belt; causing the second driving portion to change the orientation of the movable roller to orientation different from that during execution of an image forming process; and causing the intermediate transfer belt to run.