| 摘要 |
PROBLEM TO BE SOLVED: To achieve a configuration capable of sufficiently suppressing outflow of a developer due to flip-up.SOLUTION: A first transport screw 25 for transporting a developer in a development container has blades 51 formed into a spiral shape on a rotary shaft 50. The developing container has a developer outflow port 40 for flowing out a surplus developer caused by supplying the developer from the developing container. The blades 51 rotate to move from an upper side to a lower side of a vertical direction in an installation state, on facing parts facing the developer outflow port 40. At least the facing parts of the blades 51 are formed so as to direct upward toward a downstream side of the developer transport direction, with respect to the rotary shaft 50. The developer outflow port 40 has an area where a position of a lower end u becomes upper toward the downstream of the developer transport direction, at a downstream side of the developer transport direction from a position where height of the lower end u in the vertical direction is the lowest.SELECTED DRAWING: Figure 4 |
