| 摘要 |
PROBLEM TO BE SOLVED: To suppress and prevent the slipping of a developer in the longitudinal direction of a developer carrier and further, the leakage of the developer caused by impact, etc. SOLUTION: In the opening part of a developing container 30, a composite sleeve 31 provided with a magnet roller 32 inside and consisting of a nonmagnetic member and a magnetic member are arranged. A magnet seal member 34 for regulating the movement of toner is arranged in a noncontact state with a developing sleeve 31, on the outer periphery on the side of the developing container 30, of the composite sleeve 31. Further, the magnetic member of the composite sleeve 31 is arranged in the vicinity of the magnet seal member 34 and a magnetic field is generated between the magnet seal member 34 and the magnetic member, to form the napping of a magnetic brush between the magnet seal member 34 and the magnetic member by the working of the magnetic field. |
