| 摘要 |
PURPOSE:To form a magnetic brush between a magnet member and a ferromagnetic material and to easily prevent the leakage of a developer by providing the magnet member on the inner side of a bearing member of a screw, etc., in a developing container and providing the ferromagnetic material in the part of the bearing member facing the magnet member. CONSTITUTION:A cylindrical magnet ring 8 is provided on the side nearer the inner side of the developing container 2 than the bearing 6 of the screw, etc., and is fixed to a container side wall 2a. The ring 8 is magnetized in the radial direction of a revolving shaft 1 consisting of a ferromagnetic material. The shaft 1 is magnetized by the magnet 8 of this constitution, by which a magnetic circuit is formed and the dense magnetic brush M consisting of a developer 11 is formed in the spacing part between the magnet 8 and the shaft 1. Since the brush M is mostly restrained to the magnet 8, the magnet acts as an immobile brush even if the shaft 1 revolves. The leakage of the developer to the bearing 6 along the shaft 1 is, therefore, prevented. The effect is higher if an elastic sealing member 7 is provided. |
