| 摘要 |
PURPOSE:To reduce the consumption of grinding materials to reduce the running cost, by detecting points of time when the grinding treatment of an image carrier is required and executing the grinding treatment only at these points of time. CONSTITUTION:A pair of electrode plate faces 102 and 103 are exposed at an interval on the front end face of an insulating high polymer material body 101, and this front end face of the body is pressed to a face where the surface resistance should be measured, and the surface resistance is detected by the quantity of current flowed between electrode plates 102 and 103 through the face to be measured. Since the surface of a drum 1 as the image carrier is damaged if said front end face of the body 101 is pressed to the surface of the drum during the rotation of the drum 1, said front end face of the body 101 is separated from the surface of the drum and is set to the escape state by a contacting/ separating mechanism while the drum 1 is rotated, and said front end face of the body 101 is pressed to the surface of the drum 1 to measure the surface resistance of the drum 1 when the rotation of the drum 1 is stopped. In case that a pair of contacting electrodes 102 and 103 for the face to be measured are formed into rotating rolls, roll electrodes 102 and 103 are always pressed to the surface of the drum 1 and are rotated while following up the rotation of the drum 1 to measure and detect the surface resistance of the drum continuously in real time even during the rotation of the drum. |
