Patent ID: 9261823
Filing Date: 2016-02-16
CPC Classification: G03G

Claim Text:
1. A belt unit comprising: an endless belt; a plurality of rollers that include a tension roller applying a tension to the belt and around which the belt is stretched; a support member that supports the plurality of rollers; a set of two bearings that are movably provided to respective portions of the support member, the portions corresponding to longitudinal ends of the tension roller, and that rotatably support the tension roller, wherein after one of the bearings is detached from the support member, the tension roller is able to be pulled out from the belt unit, and then the belt to be replaced is able to be pulled out from the belt unit; urging members one of which is provided between the support member and one of the bearings while the other of which is provided between the support member and the other one of the bearings and that urge, to the belt, the tension roller supported by the bearings; and at least two protrusions that are provided in the support member at a portion facing the tension roller, configured to keep a position of the tension roller so as not to be inclined in a direction intersecting an urging direction of the urging members, in cooperation with the belt, in a state where the belt unit is placed so that a direction of an axis of the tension roller is parallel to a substantially vertical direction and the bearing located above in the vertical direction is detached from the support member, during an operation of replacing the belt.