Image forming apparatus

摘要

An image forming apparatus includes a stretch roller and a steering roller rotatably supporting an intermediate transfer belt and a control portion executing a meandering control operation of controlling a widthwise position of the intermediate transfer belt by operating a tilting portion tilting the steering roller. The control portion tilts the steering roller to a reference position when transfer biases are applied to first and second transfer members in forming an image to perform the meandering control operation from the reference position. The control portion is also configured to be able to update the reference position stored in a storage portion based on an inclined position of the steering roller during the meandering control operation in the state in which the transfer members are applied.

主权项

1. An image forming apparatus comprising:
an image carrier; a rotatable endless intermediate transfer belt on which a toner image is transferred from the image carrier; a first transfer member configured to transfer the toner image to the intermediate transfer belt while facing the image carrier with the intermediate transfer belt between the first transfer member and the image carrier; a second transfer member configured to transfer the toner image on the intermediate transfer belt to a recording medium; a stretch roller and a steering roller rotatably supporting the intermediate transfer belt; a tilting unit configured to tilt the steering roller; a first detecting portion configured to detect an inclined position of the steering roller; a second detecting portion configured to detect a position in a width direction orthogonal to a rotating direction of the intermediate transfer belt; a storage portion configured to store a reference inclined position of the steering roller in a state in which transfer biases are applied to both of the first and second transfer members as a reference position; a control portion configured to execute an operation of controlling a tilt of the steering roller based on a detection result of the second detecting portion by operating the tilting unit, the control portion setting an inclined position of the steering roller to the reference position in response to the application of the transfer biases to the first and second transfer members in forming an image, executing the operation from the reference position, and updating the reference position stored in the storage portion based on the inclined position of the steering roller during the operation in the state in which the transfer biases are applied.