| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming apparatus, performing cleaning for a black spot and filming generated on an image carrier, which will cause deterioration of image quality, in a suitable timing without shortening the life due to abrasion of the image carrier surface more than needed. SOLUTION: When an integrated value of integrating values obtained by multiplying the number (n) of prints of a print job by a coefficient set larger as the system speed of image formation in the print job becomes lower is A, and if the A exceeds a predetermined threshold value (e.g. 1000), the cleaning process for rotating a photoreceptor drum and an intermediate transfer belt in the same direction as a direction during the image formation for a predetermined time (e.g. 90 seconds) without exposure is performed. COPYRIGHT: (C)2011,JPO&INPIT
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