| 摘要 |
A belt driving apparatus includes a rotatable belt member; a stretching member for stretching the belt member; a steering device for stretching and steering the belt member, wherein the steering device includes a rotatable portion which is rotatable with rotation of the belt member, a frictional portion provided at each of longitudinal outsides of the rotatable portion with respect to a widthwise direction and slidable relative to the belt member by being prevented from rotating, supporting member for supporting the rotatable portion and the frictional portion, and a rotation shaft for rotatably supporting the supporting member, and wherein the steering device is capable of moving the belt member in the widthwise direction by rotating the supporting member by a force produced by sliding between the belt member and the frictional portion; and an urging member, provided at each of longitudinal end portion sides of the rotatable portion with respect to the widthwise direction, for urging the belt member against the frictional portion in contact with an outer peripheral surface of the belt member.
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