| 摘要 |
An image forming apparatus of the present invention includes a plurality of belt position sensors adapted to sense the position of an intermediate image transfer belt in a direction perpendicular to the direction of movement of the belt each. The belt position sensors are located between rollers over which the intermediate image transfer belt is passed at positions different from each other in the plane of the belt in the direction of movement. A displacement calculator produces a difference between sensed values output by the belt position sensors at a plurality of desired belt positions of the intermediate image transfer belt and sequentially adds the differences to a difference between sensed values output from the belt position sensors at belt positions different from the above desired belt positions for thereby determining a displacement of the belt in the direction perpendicular to the direction of movement of the belt.
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