Image forming apparatus having a toner concentration control cap

Details Image forming apparatus having a toner concentration control cap Image forming apparatus having a toner concentration control cap

1994-04-29

1995-09-12

Royer, William J.

Photocopying

Contact printing

Light boxes

118689, 355208, G03G 2100

Patent

active

054501776

ABSTRACT:
In an image forming apparatus, a toner concentration sensor senses the concentration of a toner contained in a developer which is stored in a developing unit. A toner concentration controller controls a toner replenishing member in response to the output of the toner concentration sensor, thereby replenishing the toner from a toner container to the developing unit. Despite that a single toner concentration sensor is located in a position relatively close to a replenishing position, the apparatus insures stable image quality by effecting toner concentration control in harmony with the balance of toner in the entire developing unit.

REFERENCES:
patent: 4032227 (1977-06-01), Hubbard et al.
patent: 4758861 (1988-07-01), Nakamaru et al.
patent: 5005517 (1991-04-01), Fukui et al.
patent: 5065190 (1991-11-01), Nakagama et al.
patent: 5216470 (1993-06-01), Asanuma et al.
patent: 5331377 (1994-07-01), Matsuura et al.
patent: 5353102 (1994-10-01), Sato et al.

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