Patent ID: 8712288

Claim:
An image forming apparatus comprising: a first belt rotatable and configured to bear a toner image; an image forming unit configured to form a toner image on the first belt; a second belt rotatable and configured to bear and convey a recording material; a transfer unit configured to transfer the toner image formed on the first belt to the recording material borne by the second belt at a nip portion formed between the first belt and the second belt; a first steering roller configured to adjust a position of the first belt in a width direction orthogonal to a moving direction of the first belt by inclining an axis; a first supporting roller arranged adjacent to the first steering roller on an upstream side of the first steering roller in a rotation direction of the first belt and configured to suspend the first belt, the first steering roller and the first supporting roller forming a first traction surface including an area of the first belt suspended by the first steering roller and the first supporting roller and contact areas where the first steering roller and the first supporting roller are in contact with the first belt; a second steering roller configured to adjust a position of the second belt in a width direction orthogonal to a moving direction of the second belt by inclining an axis, and configured to be an external supporting roller which forms a wrapping portion on an outer peripheral surface of the second belt; and a second supporting roller adjacent to the second steering roller on an upstream side of the second steering roller in a rotation direction of the second belt and configured to suspend the second belt, the second steering roller and the second supporting roller forming a second traction surface including an area of the second belt suspended by the second steering roller and the second supporting roller and contact areas where the second steering roller and the second supporting roller are in contact with the second belt, the first traction surface and the second traction surface not being in contact with each other.