| 摘要 |
An image forming apparatus includes; an image forming unit; an annular belt that moves circularly; a detection unit that detects a state of a surface of the belt; and a tension increase 5 unit that increases a tension of the belt, at a detection position by the detection unit, when detection is performed by the detection unit, as compared with the tension of the belt before detection at the detection position is performed by the detection unit.
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