| 摘要 |
To achieve the reduction in size and cost of a transfer belt unit and can prevent fluctuation of the cleaning performance. A unit comprises: a transfer belt 14, a plurality of rollers around which the transfer belt 14 is laid with certain tension, wherein at least one of the rollers is a tension roller 13 for tensioning to the transfer belt; frames 50 supporting the plurality of rollers; tensioning mechanisms 53, 56, 57 which are disposed on the side faces of the frames to bias the tension roller in a belt tensioning direction; a cleaning means being in contact with the transfer belt at a position opposing the tension roller; rotation preventing members 52, 62 which prevent the rotational torque from being transmitted to the cleaning means; and position restricting members 63 which restrict the relative position between the cleaning means and the tension roller.
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