Patent ID: 8306469
Filing Date: 2012-11-06
Classification: G03G

Abstract:
1. A belt unit, comprising: an endless belt configured to carry an image and wrapped around at least three rollers including a drive roller and a driven tension roller, wherein the drive roller rotates the endless belt and the driven tension roller applies tension to the endless belt and is indirectly driven in accordance with movement of the endless belt; a cleaning apparatus including a case which includes a gear, a screw which conveys discharged toner to a toner path, and a cleaning member configured to clean a surface of the endless belt; and a side plate configured to support the driven tension roller, the side plate including an elongated hole, wherein: the driven tension roller is at a position opposing the cleaning apparatus, and the driven tension roller includes a gear mounted thereto and is configured to directly transmit a driving force to the gear of the case so that the case discharges using a rotational force from the drive roller which rotates the endless belt, which rotates the gear mounted to the driven tension roller, which rotates the gear of the case, and the cleaning apparatus further includes: a positioning unit that is positioned with an axis of the driven tension roller; and a projection that is inserted into the elongated hole for positioning.