| 摘要 |
PURPOSE:To prevent the toner dirt for the back side of copy paper, by providing the copy member holding means having the holding plane to hold the copy member and the means making the copy bias from the back of the copy member holding plane of the copy member holding means. CONSTITUTION:Polyester film 243 in 200mu thickness is wound on the notch of the metallic frame 242 of the copy drum 24. At copying, the toner charge and opposite polarity of corona discharge current are given to the back side of the film 243 with the copy charger 25. The copy drum 24 is turned by a given number of revolutions while gripping the tip of copy paper 20 at the gripper 241 and the image with required color number can be copied. At cleaning, the discharge corona current with the same polarity as the toner charge is given at the copy charger 25 and recopy is made on the surface of the toner sensing drum 1 offset for the surface of the film 243 for cleaning. |
