| 摘要 |
PROBLEM TO BE SOLVED: To prevent electrification unevenness and to always obtain an optimum image by estimating the soiled state of an electrifying member, for changing the cleaning interval of the electrifying member with a cleaning member. SOLUTION: An electrifying roller 3 as the electrifying member in contact with a photoreceptor drum 2 as an image carrier, for electrifying it is arranged and the cleaning member 1 is pressed on the electrifying roller 3. As cleaning sequence, the number of the operation times of the cleaning member 1 is changed with a cumulative use frequency for copying as the number of image forming times from the new use start, of a drum cartridge. In other words, the cleaning member 1 is operated by a copying operation after the power of a copying machine main body is turned on, to clean the electrifying roller 3; the cleaning member 1 is operated every time all copies are made, when the cumulative number of the copies is up to 20 sheets, because fine powder from a cleaning blade is easily stuck to the photoreceptor drum 2, every time three copies are made, when the cumulative number of the copies is up to 50 sheets and every time two copies are made, when the cumulative number of the copies is up to 100 sheets. Thus, after the drum cartridge is exchanged, the cleaning interval of the electrifying roller 3 by the cleaning member 1 is made smaller as the number of the copies is smaller. |
