| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnet roller capable of restraining uneven developer sticking quantity in the roller axis direction in a main pole, by imparting the function of carrying and agitating a developer in the roller axis direction to a magnetic brush type developing roller having a fixed magnet type magnet roller. SOLUTION: The magnetic force distribution is changed in the axial direction of a roller only in a part of a magnetic pole. A part of the magnetic pole indicates one pole or four poles in five poles, and indicates one pole or the whole poles except for the main pole P1. The magnetic force distribution is imparted in the direction along a roller shaft 11 on a magnetic pole P4 being a pole for pumping up the developer. When a sleeve roller rotates in such a constitution, after the developer is pumped up by the P4 pole, the waveform developer quantity distribution of rising the developer in a saddle shape is formed in response to a magnetic force strong area. The distribution is flatly levelled in the vicinity of the P5 pole, and is sent to the P1 pole. The developer is agitated by flatly leveling by rising this developer. COPYRIGHT: (C)2009,JPO&INPIT |
