| 摘要 |
PURPOSE:To obtain an image for high quality by providing an opening for passing developer extending over axial direction in opposite side of a carrier at the end of a scraper facing the carrier and dropping developer from the upper developer carrying means side to the lower developer carrying means side. CONSTITUTION:Developer participated once in developing and lowered in concentration is carried by a lower screw 4 into a tube are C having curvature and then carried to an upper screw 4'. At this time, proper quantity of toner is supplied from a toner hopper 11 through a toner replenishing port 13 by a toner concentration detector and a toner agitating rod 12, and mixed by a screw in the area C, and developer made to prescribed concentration is carried to the upper part of a developing sleeve 3. At this time, the upper screw 4' carries developer from the front to inner part of the sleeve 3 by a partition 5 with a fixed quantity of developer accumulated in it. An opening 5' is provided in the partition 5, and developer above a fixed quantity is supplied from the opening 5' to the sleeve 3. |
