Toner concentration control device for a developing apparatus

Details Toner concentration control device for a developing apparatus Toner concentration control device for a developing apparatus

1987-10-21

1990-02-13

Braun, Fred L.

Photocopying

Contact printing

Light boxes

118689, G03G 2100

Patent

active

049011154

ABSTRACT:
A developing apparatus which includes a toner replenishing device for replenishing toner into the developing apparatus, a toner concentration detecting sensor for generating an output coresponding to the toner amount in a developing material stirred and transported through the developing apparatus, with the output containing a varying output periodically produced and stable output, a discriminating element for deriving the stable output of the outputs from the toner concentration detecting element, and a comparator for outputting a feeding signal to the toner replenishing device through comparison between the output from the discriminating element and a preliminarily set reference value.

REFERENCES:
patent: 3778146 (1973-12-01), Knapp
patent: 4423948 (1984-01-01), Kimura et al.
patent: 4447145 (1984-05-01), Snelling et al.
patent: 4579442 (1986-04-01), Minejima
patent: 4592645 (1986-06-01), Kanai et al.
patent: 4662313 (1987-05-01), Jeromin et al.
patent: 4708458 (1987-11-01), Ueda et al.
patent: 4711551 (1987-12-01), Fujio et al.

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