Electrophotography – Image formation – Development
Reexamination Certificate
2007-12-12
2011-11-08
Ngo, Hoang (Department: 2852)
Electrophotography
Image formation
Development
C399S256000
Reexamination Certificate
active
08055161
ABSTRACT:
An image forming apparatus, a developing unit thereof and a method of controlling the developing unit. The image forming apparatus includes a photosensitive body on which an electrostatic latent image is formed, a light scanning unit which scans a beam onto the photosensitive body, a developing unit which includes a housing having an agitating space and a supply space, the agitating space and the supply space communicating with each other through two gates to circulate a developer, an agitating auger rotatably mounted in the agitating space to transfer the developer, a supply auger rotatably mounted in the supply space to transfer the developer, and a magnetic roller which receives the developer by the supply auger and adheres the developer to the photosensitive body, a rotation control unit which controls rotation of the agitating auger and the supply auger, and a transfer unit which transfers a visible image formed on the photosensitive body onto a printing medium. When the developer is concentrated on any one of two gates, one of the augers, which is positioned on a downstream side of the gate on which the developer is concentrated, temporarily stops rotating by the rotation control unit, and the developer concentrated on the gate is transferred from the gate by the other one of the augers, which is positioned on an upstream side of the gate on which the developer is concentrated.
REFERENCES:
patent: 2006-106114 (2006-04-01), None
Ngo Hoang
SAMSUNG Electronics Co., Ltd.
Stanzione & Kim LLP
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