DEVELOPING DEVICE

• Main Author: SAKAMAKI TOMOYUKI
• Format: Patent
• Language: English; Japanese
• Published: 28.04.2016
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

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 【課題】跳ね上げによる現像剤の排出を十分に抑制できる構成を実現する。【解決手段】現像容器内で現像剤を搬送する第１の搬送スクリュー２５は、回転軸５０上に螺旋状に形成された羽根５１を有する。現像容器は、現像剤の補給に伴う余剰現像剤を現像容器から排出するための現像剤排出口４０を有する。羽根５１は、現像剤排出口４０に対向する対向部分で、設置状態における上下方向の上方から下方に向かうように回転する。また、少なくとも羽根５１の対向部分が回転軸５０に対して現像剤搬送方向下流に向かうほど上方に向かうように形成されている。現像剤排出口４０は、上下方向の下端ｕの高さが最も低くなる位置よりも現像剤搬送方向下流側で、下端ｕが現像剤搬送方向下流に向かうほど上方に位置する領域を有するように構成されている。【選択図】図４