Toner level detection system

Details Toner level detection system Toner level detection system

1989-11-30

1991-02-05

Kashnikow, Andres

Dispensing

With recorder, register, indicator, signal or exhibitor

Audible

222 66, 222167, 222325, 222DIG1, B67D 508

Patent

active

049897543

ABSTRACT:
A toner cartridge is modified by the addition of a low toner sensing mechanism internal to the cartridge. An arm is pivotably mounted within the cartridge; the suspended end of the arm having a magnet secured thereto. When the cartridge is filled to a relatively high level with toner and rotated, the suspended arm is at least partially submerged in the toner bed and is subjected to a viscous drag force which moves the arm from the vertical position and prevents the arm from returning to the vertical or plumb orientation until a sufficiently low toner level occurs. At this point the arm is sufficiently free from the viscous drag effects of the rotating toner bed and attains a plumb position which brings it into alignment with a switching circuit which is closed by action of the proximate magnet. The switching circuitry generates signals which are used to produce a visible or audible signal to the operator, and/or which cause machine shut down to occur.

REFERENCES:
patent: 3920155 (1975-11-01), Whited
patent: 3979022 (1976-09-01), Whited
patent: 4690540 (1987-09-01), Manno
Xerox Disclosure Journal, vol. 5, No. 1, Jan./Feb. 1980.

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