| 摘要 |
PURPOSE:To form pictures of good quality without white stripes by setting the half-amplitude level of a magnetic pole, which is placed in an aperture part of a developing vessel, of a magnetic member to a specific ratio to the aperture width of the developing vessel to cause a great agitating action without providing an agitating mechanism. CONSTITUTION:A magnetic body 20 is provided as the magnetic member in the position of a magnetic pole S2 in the lengthwise direction of a magnet roller 2, and a half-amplitude level 23 of the magnetic pole S2 is set to 40-80% of an aperture width 11 of a hopper. Therefore, a tuft 24 is formed in a wide range to strength the diffusing action of a toner current E; and when the toner current E is circulated once to try to contact with a sleeve 1, it is agitated by the diffusing action of the tuft 24, and a toner block is loosened, and a surface layer is not generated. As the result, sufficient trioelectrification is given to the whole of a toner 5, and a sufficient quantity of toner is supplied to a blade part 3, and generation of white stripes is prevented. |
