| 摘要 |
PURPOSE:To compensate the diameter decrease of an Si rubber roll at the center part and to prevent copying paper which is used at a low frequency from being crumpled by impregnating the Si rubber roll with oil at the center part within a specific range after polishing to hold the center part at a sweeling-out state. CONSTITUTION:Both end parts of a press-contacting roll 6' which are about one- fifth an overall length l are covered with oil proof coating bodies 7a and 7b. This press-contacting roll is dipped in silicone oil to impregnate the center part 6' with the silicone oil. The roll is then taken out and the coating bodies 7a and 7b at both ends are removed to form a projection body S' which has a 0.1-0.3mm. stepped difference between the radiuses at the center part of the roll by the impregnation of the silicone oil. Therefore, the crumpling which occurs when the roll diameter of a specified part decreases at the time of copy size with a high frequency of use and the crumpling caused by the paper of different size is prevented by said roll. |
