Patent ID: 6766120
Filing Date: 2004-07-20
Classification: G03G

Abstract:
An image forming apparatus, comprising:a conveying unit conveying a recording medium; a trouble-detecting unit detecting whether some trouble occurs against conveyance of the recording medium; a trouble-clearing-up judging unit judging whether the trouble detected by the trouble-detecting unit has been cleared up; an image bearing body bearing thereon a visible image, which is made from a developing agent electrically charged in a predetermined polarity; a transfer unit located opposing the image bearing body and transferring the visible image onto the recording medium; a cleaning roller located opposing and contacting the image bearing body and collecting the developing agent from the image bearing body; and a control unit applying the transfer unit with a bias voltage of a polarity opposite to that of the developing agent when the trouble-detecting unit detects no trouble, the control unit applying, when the trouble-judging unit detects some trouble, the transfer unit with a bias voltage of a polarity the same as that of the developing agent after the trouble-clearing-up judging unit judges clearing-up of the trouble, wherein the control unit controls at least one of the cleaning roller and the image bearing body in a first condition when the trouble-detecting unit detects no trouble, the control unit controlling, when the trouble-judging unit detects some trouble, the at least one of the cleaning roller and the image bearing body in a second condition that is different from the first condition after the trouble-clearing-up judging unit judges clearing-un of the trouble, and the control unit changes the second condition in accordance with an image-forming number indicative of the number of images which the image bearing body has produced until the trouble-detecting unit detects the trouble.