| 摘要 |
PURPOSE:To make a device only for cleaning unnecessary and obtain one copy in one rotation, by providing a toner supply device on the side of a developing roll other than the first developing roll out of plural developing rolls and providing a developer intercepting wall between the first developing roll and other developing rolls. CONSTITUTION:A toner supply device 20 is provided on the side of the second developing roll, and a toner percentage of content alpha of the first developing roll 15 is made lower than a toner percentage of content beta of the second developing roll. Since the development efficiency of the developing roll 15 is higher than that of the developing roll 16, the toner percentage of content alpha is held in a value smaller than the toner percentage of content beta. However, since the residual toner to a print master is removed mainly by the developing roll 15, the toner percentage of content alpha is not lowered in excess. The flow-out of the developer from the side of the developing roll 16 to the side of the developing roll 15 is intercepted by an inercepting wall 21. Consequently, a device only for cleaning is unnecessary, and one copy is obtained in one rotation. |
