| 摘要 |
PURPOSE:To apply a constant amount of toner uniformly and stably without any streak and irregularity on a developing roll by arranging a coating blade where the toner falls by gravity. CONSTITUTION:A rubber blade 7 is provided on a side where the toner is scooped up onto the developing roll 3, and the end part of the blade 7 causes the toner to fall along the developing roll 3 or in the air. When the contacting point between the end part of the blade 7 and the roll 3 is provided more left on the developing roll 3 than the vertical line running in the center of the developing roll 3, more toner stays in the space A surrounded by the blade 7 and developing roll 3. The toner tends to stay ununiformly in the lengthwise direction of the roll and also tends to increase in layer thickness, but the blade 7 is fitted where the toner falls, thereby preventing those phenomena. |
