| 摘要 |
A toner pattern image is formed on a surface of a photoreceptor, and an amount of toner adhering to a transferring belt is estimated in accordance with a concentration detecting signal of the toner pattern image, and a time or a voltage at which a bias having the same polarity as the toner is applied to the transferring belt is determined, so as to perform the cleaning step of the transferring belt. The amount or the concentration of the toner that actually adheres to the transferring body is detected. Further, feedback can be carried out with respect to the cleaning operation according to the detection result.
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