| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately decide the cleaning state of an image carrier. <P>SOLUTION: In a state where the cleaning circumstances of the image carrier are excellent, a torque difference F made between a state where developer exists at a rubbing part with a blade on the image carrier and a state where the developer does not exist at the rubbing part with the blade on the image carrier becomes larger than a prescribed value. Meanwhile, in a state where the cleaning circumstances of the image carrier get worse, the torque difference F made between a state where the developer exists on the image carrier and a state where the developer does not exist on the image carrier becomes small. When the cleaning circumstances of the image carrier get worse further, the driving torque of a motor in the state where the developer exists on the image carrier becomes smaller than that in the state where the developer does not exist on the image carrier. A control part detects the driving torque for driving the image carrier for both of the state where the developer exists on the image carrier and the state where the developer does not exist thereon, and predicts the exchange time of the blade. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
