DEVELOPING ROLLER AND DEVELOPING DEVICE USING THE SAME, AND IMAGE FORMING APPARATUS

• Main Authors: TOKUTAKE SHINYA, SHIMA TOSHIAKI
• Format: Patent
• Language: English; Japanese
• Published: 22.08.2016
• Subjects: BEARINGS; BLASTING; CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FLEXIBLE SHAFTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HOLOGRAPHY; LIGHTING; MAGNETOGRAPHY; MECHANICAL ENGINEERING; PHOTOGRAPHY; PHYSICS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; THERMAL INSULATION IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To provide a developing roller that prevents a significant reduction in developer conveyance performance due to a long-term use, and enables a regulating member to easily adjust the amount of developer to be conveyed to a developing area.SOLUTION: A developing roller comprises: a rotatable cylindrical developing sleeve 42 that conveys a developer D while carrying the developer on its surface to a developing area facing a photoreceptor drum 21; and a magnet roller 41 that is provided inside the developing sleeve 42. A plurality of two-stage V-shaped grooves 45 each having a first V-shaped groove 451 that further has a second V-shaped groove 452 formed therein and extending in the axial direction, are formed on the surface of the developing sleeve 42 at a predetermined interval in the circumferential direction. The vertex angle α of the first V-shaped groove 451 is made larger than the vertex angle β of the second V-shaped groove 452.SELECTED DRAWING: Figure 6 【課題】現像剤の搬送性能が長期間の使用によって大きく低下することがなく、しかも規制部材による現像領域への現像剤の搬送量の調整を容易にできる現像ローラを提供する。【解決手段】感光体ドラム２１と対向する現像領域に現像剤Ｄを表面に担持して搬送する回転自在で筒状の現像スリーブ４２と、この現像スリーブ４２内に設けられたマグネットローラ４１とを備える。そして、現像スリーブ４２の表面に、第１のＶ字溝４５１内にさらに第２のＶ字溝４５２が形成された、軸方向に延びる２段Ｖ字溝４５を円周方向に所定間隔で複数本形成し、第１のＶ字溝４５１の頂角αを第２のＶ字溝４５２の頂角βよりも大きくする。【選択図】図６