Patent ID: 9229391
Filing Date: 2016-01-05
CPC Classification: G03G

Claim Text:
1. A belt drive device that restricts, with respect to an endless belt laid under tension over a drive roller and a driven roller, meandering of the belt in a roller axis direction, comprising: a roller member that is arranged at each of both end portions of the driven roller in an axis direction thereof and restricts meandering of the belt in the roller axis direction, wherein the roller member has: the elastic roller portion is constituted by having: the clearance is configured to be smaller than a thickness of the belt, and when the end portion of the belt has entered the clearance against an elastic force of the elastic roller portion, a rotational load of the belt at the end portion is increased by using a braking force of the brake portion so as to restrict meandering of the belt in the roller axis direction.