Toner concentration sensing using auger mounted magnet

Details Toner concentration sensing using auger mounted magnet Toner concentration sensing using auger mounted magnet

1991-07-30

1992-05-05

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355245, 366142, G03G 1506, B01F 1500

Patent

active

051112477

ABSTRACT:
A toner concentration sensing system is disclosed for controlling the dispensing of toner into a developer sump. A toner concentration sensor is located in the bottom of the mixing area of the developer sump adjacent one of the mixing augers. The toner concentration sensor can be positioned flush with the bottom of the mixing chamber or the sensor can project slightly from the bottom of the chamber. A magnet is positioned on the rotating mixing auger for rotating with the auger past the toner concentration sensor. As the auger rotates, the magnet with developer material adhering thereto, sweeps the top of the toner sensor to improve the accuracy of the toner concentration readings. A toner dispenser is actuated when the detected toner concentration goes below a predetermined limit.

REFERENCES:
patent: 4075977 (1978-02-01), Williams
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patent: 4378754 (1983-04-01), Rasekhi et al.
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patent: 4868601 (1989-09-01), Morimoto et al.
patent: 4956669 (1990-09-01), Nakamura
patent: 4959690 (1990-09-01), Trainor et al.
patent: 4963929 (1990-10-01), Ueda et al.

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