| 摘要 |
While a first cleaning bias (600 V) is applied to a cleaning roller, a bias applied to a transfer roller is switched between a second transfer bias and a first transfer bias. The surface potential of a photosensitive drum changes depending on the bias applied to the transfer roller. When the photosensitive drum contacts the transfer roller while the second transfer bias is applied to the transfer roller, the surface potential of the photosensitive drum becomes the second surface potential (approximately 900-1000 V). When the photosensitive drum having the second surface potential contacts the cleaning roller, the cleaning roller collects toner remaining on the photosensitive drum. When the photosensitive drum contacts the transfer roller while the first transfer bias is applied to the transfer roller, the surface potential of the photosensitive drum becomes the first surface potential (approximately 200-400 V). When the photosensitive drum having the first surface potential contacts the cleaning roller, the cleaning roller releases the collected toner to the photosensitive drum.
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