DEVELOPING DEVICE AND IMAGE FORMING APPARATUS

摘要

PROBLEM TO BE SOLVED: To realize uniform conveyance of developer and to prevent poor printing such as image density unevenness even when a developing device is used for a full color printer for which high printing density is required or a printer with fast print speed by using the on-pole bristle cutting development in which a doctor blade which is a restriction member of developer is arranged so as to face a magnetic pole to a fountain type developing device. SOLUTION: In the fountain type developing device of two-component developer system in which at least one pair of a plurality of development rolls are arranged by making development rolls which rotate in the reverse direction and the same direction of the direction of rotation of an image carrier adjacent to each other and providing the restriction member for restricting an amount of conveyance of the developer between the paired development rolls, development is the on-pole bristle cutting development opposite to magnets of two development rolls of which the restriction members are adjacent to each other and polarity of magnet of the development rolls opposite to a doctor blade part is made into the opposite polarity. COPYRIGHT: (C)2007,JPO&INPIT