| 主权项 |
1. An image forming apparatus comprising:
an image carrier; a toner image forming unit configured to form a toner image on the image carrier; an endless transfer belt configured to convey a recording medium; a transfer roller forming a transfer portion configured to urge toward the image carrier from an inner circumferential surface of the transfer belt across the transfer belt; a first stretch roller stretching the transfer belt, disposed at a position adjacent to and downstream in a moving direction of the transfer belt of the transfer portion, and including a first straight area disposed at a center part in a direction of axis of rotation thereof where a diameter is substantially constant and first tapered areas disposed on both end parts in the direction of axis of rotation where the diameter is smaller than the first straight area such that the closer to the both ends, the smaller the diameter become; and a second stretch roller stretching the transfer belt, disposed at a position adjacent to and downstream in the moving direction of the transfer belt of the first stretch roller, and including a second straight area disposed at a center part in a direction of axis of rotation thereof where a diameter is substantially constant and second tapered areas disposed on both end parts in the direction of axis of rotation where the diameter is larger than the second straight area such that the closer to the both ends, the larger the diameter become. |
