Apparatus for detecting a residual quantity of toner

Details Apparatus for detecting a residual quantity of toner Apparatus for detecting a residual quantity of toner

1979-08-30

1982-02-02

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

73290V, 310321, 310323, 310338, 340621, G08B 2100

Patent

active

043142427

ABSTRACT:
An apparatus for detecting a residual quantity of toner remaining in the supply hopper of a copying machine includes a piezoelectric vibrating element disposed in a wall of the hopper and having a surface normally positioned in contact with toner in the hopper, and an electronic circuit for causing vibration of the element at a predetermined frequency and for detecting changes in operating characteristics of the element as representative of a decrease in the amount of toner in the hopper to operate a warning device.

REFERENCES:
patent: 2932818 (1960-04-01), Lubkin
patent: 2990543 (1961-06-01), Rod
patent: 3110890 (1963-11-01), Westcott et al.
IBM Tech. Discl. Bull., vol. 15, No. 5, Oct. 1972, "Material Presence Detector", by Kudsi et al., pp. 1545-1546.

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