| 摘要 |
PROBLEM TO BE SOLVED: To prevent the deterioration of development, attributable to developer clogging, tailing, and obscuring of thin lines in a development machine of the center field method. SOLUTION: In a development machine which has a plurality of developing rolls of a developing roll, that rotates in the same direction as the peripheral velocity direction of the photoreceptor, and a developing roll that rotates in the direction reverse to it, and uses a two-component developer constituted to include a toner and a carrier of which average particle diameter is 80μm or smaller; a doctor gap of the developing roll, that rotates in the direction reverse to the peripheral velocity direction of the photoreceptor, is made smaller than the doctor gap of the developing roll that rotates in the same direction as the peripheral velocity direction of the photoreceptor, concerning the doctor gap, which is the gap between a developer amount control member and the developing rolls. A magnetic force of the development main pole of the developing roll that rotates, in a direction reverse to the peripheral velocity direction of the photoreceptor is set at 50-70% of the magnetic force of the development main pole of the developing roll, that rotates in the same direction as the peripheral velocity direction of the photoreceptor. COPYRIGHT: (C)2007,JPO&INPIT |
