MAGNETIC TONER CONVEYING DEVICE

PURPOSE:To prevent mutual interference in a magnetic field which occurs between mutual polyphase armature coils by making an alternating current (AC) for energizing the armature coil as an intermittent AC so that the polyphase armature coils may not be simultaneously excited by polyphase AC. CONSTITUTION:In a developing sleeve 10, on the inner surface of a thin cylindrical member 11 made of non-magnetic material, a 1st armature coil 12 is disposed outside and a 2nd armature coil 13 is disposed inside. The polyphase AC whose phases are mutually deviated only by a prescribed quantity is made to be the intermittent AC provided with a fixed no-current interval between the positive direction current and the negative direction current of the AC in the armature coils 12 and 13. And the mutual temporal overlapping of the positive direction current or the negative direction current of each phase is prevented by the int1ermittent AC. Then, the polyphase armature coils 12 and 13 are not simultaneously energized by the polyphase AC. Thus, the interference in the magnetic field which occurs between the mutual polyphase armature coils 12 and 13 can be prevented.