Electrophotography – Image formation – Development
Patent
1996-11-25
1998-05-12
Ramirez, Nestor R.
Electrophotography
Image formation
Development
399273, 399278, 399288, G03G 1509, G03G 15095
Patent
active
057521395
ABSTRACT:
A dual-component magnetic brush developing device using a dual-component developer containing magnetic carriers and toner electrically attracted to the magnetic carriers. The dual-component magnetic brush developing device comprises: a magnetic field generation member being formed with a plurality of magnetic poles almost equally spaced from each other on a peripheral surface; a developer transport member being supported outside the magnetic field generation member for circumferential rotation and moving together with the magnetic field generation member at least in a developing area facing the image carrier in the proximity thereof; toner supply means for supplying an excess of new toner to magnetic carriers supported on the developer transport member and passing through the developing area; magnetic field reduction unit for reducing a magnetic field strength in the vicinity of a surface of the developer transport member by an agitation section for agitating the developer to which the excessive toner is supplied; and excessive toner separation unit being disposed downstream from the agitation section in a circumferential rotation direction of the developer transport member for separating excessive toner from the magnetic carriers supported on the developer transport member.
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Ito Isao
Sumikawa Takeshi
Fuji 'Xerox Co., Ltd.
Ramirez Nestor R.
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