| 摘要 |
A belt driving apparatus includes a first rotatable belt member; a first supporting member rotatably supporting the first belt member; a first steering roller, rotatably supporting the first belt member, for adjusting a position, with respect to a widthwise direction perpendicular to a rotational direction, of the first belt member, wherein one end of the first steering roller is fixed, and the other end thereof is movable; control means for controlling movement of the other end of the first steering roller; a second rotatable belt member contacted to the first belt member; a second supporting member rotatably supporting the second belt member; a second steering roller, rotatably supporting the second belt member, for adjusting a position, with respect to the widthwise direction, of the second belt member, wherein an end of the second steering roller remote from the one end of the first steering roller is fixed, and an end thereof adjacent the other end the second steering roller is movable; and control means for controlling movement of the end of the second steering roller adjacent the other end the second steering roller.
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