Patent ID: 8326181
Filing Date: 2012-12-04
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a photosensitive member; a rotatable intermediate transfer belt configured to carry a toner image transferred from the photosensitive member; a supporting roller configured to support the intermediate transfer belt and to form a transfer portion at which the toner image formed on the intermediate transfer belt is transferred to a recording material; a driving roller disposed in an upstream side of the photosensitive member and in a downstream side of the transfer portion in a rotational direction of the intermediate transfer belt and configured to transmit a driving force to the intermediate transfer belt; a motor configured to supply a driving force to the driving roller; a first frame configured to rotatably support two ends of the supporting roller; a second frame disposed to be tiltable relative to the first frame and configured to rotatably support two ends of the driving roller; a belt position sensor disposed on the second frame and configured to detect a position of the intermediate transfer belt in a longitudinal direction of the driving roller; a tilt driving unit configured to tilt the second frame to the first frame so as to tilt the driving roller relative to the supporting roller; a tension roller disposed on the second frame and at a position adjacent the driving roller in the downstream side of the driving roller in the rotational direction of the intermediate transfer belt and configured to supply a tension to the intermediate transfer belt; an elastic unit configured to elastically support the tension roller; and a control unit configured to control the tilt driving unit based on the belt position detected by the belt position sensor.