DEVELOPING DEVICE

To sufficiently suppress discharge of developer by jump-up in a configuration in which a developer discharge port is arranged at a position opposed to a portion where a blade of a screw is rotates so as to move from a lower side to an upper side.SOLUTION: A developing device has a spiral blade 51 on...

Full description

Saved in:
Bibliographic Details
Main Author SAKAMAKI TOMOYUKI
Format Patent
LanguageEnglish
Japanese
Published 18.06.2020
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
Online AccessGet full text

Cover

More Information
Summary:To sufficiently suppress discharge of developer by jump-up in a configuration in which a developer discharge port is arranged at a position opposed to a portion where a blade of a screw is rotates so as to move from a lower side to an upper side.SOLUTION: A developing device has a spiral blade 51 on a rotary shaft 50 and has a conveying screw 25 for conveying developer in a developer container 22 along the rotary shaft 50 by rotation. The developer container 22 has a developer discharge port 40 for discharging surplus developer accompanied by supply of the developer from the developer container 22 at a position facing the blade 51. The blade 51 rotates vertically from downward to upward in an installation state at a portion opposed to the developer discharge port 40. The developer discharge port 40 has a bottom side 61 where a lower end 41 in a vertical direction is positioned at a lowermost side in the vertical direction, and an upper end portion 62 that is located at a downstream side in a developer conveyance direction D1 than the bottom side 61 and is positioned above the bottom side 61.SELECTED DRAWING: Figure 7 【課題】スクリューの羽根が下方から上方に向かうように回転する部分に対向する位置に現像剤排出口が配置されている構成において、跳ね上げによる現像剤の排出を十分に抑制する。【解決手段】現像装置は、回転軸５０上に螺旋状の羽根５１を有し、回転することで回転軸５０に沿って現像容器２２内の現像剤を搬送する搬送スクリュー２５を有する。現像容器２２は、羽根５１と対向する位置で、現像剤の補給に伴う余剰現像剤を現像容器２２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下方から上方に向かうように回転する。現像剤排出口４０は、上下方向の下端４１が、上下方向に関して最も下側に位置する底辺６１と、底辺６１よりも現像剤搬送方向Ｄ１の下流側に位置すると共に底辺６１よりも上側に位置する上端部６２と、を有する。【選択図】図７
Bibliography:Application Number: JP20180232719