Patent ID: 8391763

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