| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming apparatus improved to lessen the discharge of waste toner to the outside by collecting the waste toner to the inside of the apparatus, and a waste toner collecting method. SOLUTION: In the tandem type image forming apparatus, the waste toner stuck to an intermediate transfer belt 50 is collected by a cleaning brush 1. Alternating voltage is applied to the cleaning brush 1 so as to discharge the waste toner to the intermediate transfer belt 50. The waste toner is collected by a photoreceptor (image carrier) 41K in a K (black) image forming station, its polarity is made uniform by electrifying the image carrier 41K again, and then the waste toner is collected to a developing device 44K and stored in a toner tank or the like. In such a case, bias voltage of Y, M and C primary transfer rollers 45 (Y, M and C) is controlled so that the waste toner on the intermediate transfer belt 50 may not adhere to the Y, M and C image carriers. COPYRIGHT: (C)2007,JPO&INPIT
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