| 摘要 |
PURPOSE:To prevent a developer from deteriorating and excessive triboelectrification from being caused by arranging a magnetic pole which faces an opening part closer to a magnetic member than the center of the angle that the contact part of a control member and the magnetic member contains so as to reduce the control force to the developer in a downstream side. CONSTITUTION:The magnetic member 10 is arranged in a developer container 4 and the position of the magnetic member 10 is set in the magnetic field area of one of two poles of a magnet roll 3, i.e. a magnetic pole 3a which is directed to the inside of the developer container 4 and on the upstream side of a develop ing sleeve 2 as compared with the maximum magnetic force line position of the magnetic pole 3a. Thus, the magnetic member 10 is arranged on the entrance side of the developer container, so control force operates on the developer here, so control force to the developer further on a downstream side is reducible. Consequently, the developer is prevented from deteriorating owing to partially intense control by the control member 5 and excessive triboelectrification is precluded. |
