| 摘要 |
An oblique movement preventing device for an endless belt, the inner surface of the belt supported by rollers, and at least one roller circulating the belt on the rollers, includes a contact angle changing unit. The changing unit selectively presses either side part of the outer surface of the belt at a position near to the one roller on an upstream side of the one roller in the predetermined belt circulating direction, thereby changing a contact angle of the belt on the one roller along the width direction of the belt. A measuring unit measures a direction and distance of displacement of the belt caused by the oblique movement thereof, and a control unit controls the operation of the changing unit to cease the oblique movement of the belt, based on the measured direction and distance of displacement of the belt.
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