Powder density control circuit for a photocopier

Details Powder density control circuit for a photocopier Powder density control circuit for a photocopier

1979-02-02

1980-02-26

Hoffman, James R.

Coating apparatus

Control means responsive to a randomly occurring sensed...

Responsive to condition of coating material

G03G 1509

Patent

active

041900189

ABSTRACT:
A powder density control means is provided for use in a photocopier machine of the type in which a photoconductor is charged in accordance with an image to be recorded thereon and is developed by contact with a toner powder attracted thereto from a mixture of carrier particles and toner powder carried by a developer assembly including a replenishment means for periodically adding toner powder. A high value resistance and a bias supply are serially coupled to a magnetic brush of the developer assembly. The voltage across the magnetic brush provides an indication of how heavily the latent image on the photoconductor is being toned. The change in magnitude of the voltage on the brush is sensed and when a predetermined amount of voltage change is detected, an additional amount of toner powder is supplied by the replenisher to the developer unit for such change.

REFERENCES:
patent: 3719165 (1973-03-01), Trachienberg et al.
patent: 3892672 (1975-07-01), Gawron
patent: 3893408 (1975-07-01), Lamel
patent: 3941084 (1976-03-01), Kurita
patent: 4064834 (1977-12-01), Sund

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