Photocopying – Contact printing – Light boxes
Patent
1987-11-18
1989-08-08
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355 3DD, 355260, 355245, 118658, G03G 1500
Patent
active
048557838
ABSTRACT:
A developing device in which toner fed from a toner cartridge is caused to flow down by a toner supply roller and, then, mixed with a developer by an agitating roller unit which is made up of a spiral blade and a plurality of radial blades. The spiral blade of the roller unit is greater in outside diameter than the radial blades. Those parts of the spiral blade where the individual chambers are located are notched at one side of the spiral blade and intermittently with respect to an order in the circumferential direction, and those parts of the radial blades where the individual chambers into which the developer from the notched parts of the spiral blade flows are notched. The developing device further comprises a developing roller, a paddle wheel for supplying the developer to the developing roller, a doctor blade for regulating the developer on the developing roller to a predetermined thickness, a separator for returning the developer scraped off by the doctor blade toward the paddle wheel and roller unit, a restricting member extending from a developer outlet side of the separator to a position between the paddle wheel and the developer agitating roller unit for blocking a part of the developer collected from the separator. The developer is moved away from the paddle wheel in response to rotation of the roller unit.
REFERENCES:
patent: 4559898 (1985-12-01), Fukuchi et al.
patent: 4583843 (1986-04-01), Ohata et al.
patent: 4601259 (1986-07-01), Yamashita
Sawayama Noboru
Takashima Masayuki
Beatty Robert
Grimley A. T.
Ricoh & Company, Ltd.
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