DEVELOPING DEVICE

• Main Authors: YAMADA HIDENAO, ISHIDA YOSHIO
• Format: Patent
• Language: English; Japanese
• Published: 05.07.2023
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

To positively return toner excessively put on a developing roller into a housing.SOLUTION: A developing device includes: a housing; a developing roller 20 extending in an axial direction; a lower film 60 that extends in the axial direction and contacts an outer peripheral surface of the developing roller 20; and a side seal 70 that contacts one end portion in the axial direction of the outer peripheral surface of the developing roller 20. The side seal 70 has an upstream seal 72 that overlaps one end portion in the axial direction of the lower film 60. The upstream seal 72 has a plurality of upstream convex portions 72A extending in a direction inclined so as to be positioned inside in the axial direction as it goes downstream in a moving direction on a surface contacting the outer peripheral surface of the developing roller 20. The lower film 60 has an inclined portion Eg inclined so as to be positioned inside in the axial direction as it goes downstream in the moving direction at an edge overlapping with the upstream seal 72. An inclination angle θ1 with respect to the moving direction of the upstream convex portion 72A is larger than an inclination angle θ2 with respect to the moving direction of the inclined portion Eg.SELECTED DRAWING: Figure 3 【課題】現像ローラ上に過剰に載ったトナーを筐体内に積極的に戻すことを目的とする。【解決手段】現像装置は、筐体と、軸方向に延びる現像ローラ２０と、軸方向に延びて現像ローラ２０の外周面と接触するロアフィルム６０と、現像ローラ２０の外周面の軸方向の一端部と接触するサイドシール７０を備える。サイドシール７０は、ロアフィルム６０の軸方向の一端部と重なる上流側シール７２を有する。上流側シール７２は、現像ローラ２０の外周面と接触する表面に、移動方向下流側にいくにつれて軸方向内側に位置するように傾斜する方向に延びる複数の上流側凸部７２Ａを有する。ロアフィルム６０は、上流側シール７２に重なる縁に、移動方向下流側にいくにつれて軸方向内側に位置するように傾斜する傾斜部Ｅｇを有する。上流側凸部７２Ａの移動方向に対する傾斜角度θ１は、傾斜部Ｅｇの移動方向に対する傾斜角度θ２よりも大きい。【選択図】図３