Patent ID: 8346140

Claim:
A belt driving apparatus for rotationally driving a belt member, said belt driving apparatus comprising: a stretching member for stretching the belt member; steering means including a steering member having a rotatable portion which is rotatable with rotation of the belt member, frictional portions slidable relative to the belt member and provided at each of longitudinal outsides of said rotatable portion, and further including supporting means supporting said steering member, and a rotation shaft rotatably supporting said supporting means, said steering means being effective to steer the belt member by tilting said steering member by a force produced by sliding between said frictional portions and the belt member; and resisting force applying means for applying a resisting force against the force to tilt said steering member, the resisting force increasing with increase of an angular velocity of said steering member which is a rate of change of a tilt angle of said steering member around said rotation shaft per unit time.