Image forming apparatus having rotary developing device

Details Image forming apparatus having rotary developing device Image forming apparatus having rotary developing device

1995-04-20

1997-04-01

Brase, Sandra L.

Electrophotography

Diagnostics

Consumable

399119, 399262, G03G 1501

Patent

active

056171986

ABSTRACT:
In an image forming apparatus, a rotary developing unit or revolver is loaded with a removable black developer container at the center thereof. The container is formed with a toner outlet. A receptacle assigned to black toner is provided at the end of the axis of the revolver and formed with a toner inlet. The receptacle constitutes a hopper portion. A supply roller is disposed in the receptacle. A screw conveyor extends out from a black developing chamber defined in the revolver into a communication chamber which communicates the receptacle to the developing chamber. A shutter is located at the loner inlet of the receptacle and rotatable due to its own weight while the revolver is in rotation. When more than a predetermined number of printings are produced by use of the black developing chamber, printing is interrupted. Then, the revolver is rotated to transfer the toner from the container to the hopper portion. The revolver may be rotated every time a single printing is produced.

REFERENCES:
patent: 3987756 (1976-10-01), Katayama et al.
patent: 4615612 (1986-10-01), Ohno et al.
patent: 4620783 (1986-11-01), Tanaka et al.
patent: 4782360 (1988-11-01), Iwamoto et al.
patent: 4821075 (1989-04-01), Saito et al.
patent: 4922301 (1990-05-01), Katoh et al.
patent: 5198866 (1993-03-01), Kimura et al.

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