| 摘要 |
PROBLEM TO BE SOLVED: To provide such an image forming apparatus in which the time required for cleaning of a transfer means can be shortened, a lifetime is high and a satisfactory image free of the occurrence of back staining can be obtained with high efficiency. SOLUTION: The image forming apparatus has an image carrier for carrying a toner image on its surface, the transfer means for transferring the toner image on the image carrier to the transfer means by coming into contact with the rear surface of the transfer means to transfer the toner image to the transfer material, a transfer means cleaning bias applying means for applying a bias to the transfer means to the transfer means in order to move the toner sticking to the surface of the transfer means to the image carrier, and a transfer material width detecting means for detecting the transverse direction size of the transfer material, in which the cleaning operation of the transfer means is performed at least in the start and end of image formation and the presence or absence of the cleaning operation is determined by the transfer width detected by the transfer material width detecting means and the number of feeding paper in the start and end of the image formation. COPYRIGHT: (C)2007,JPO&INPIT
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