Developer material level sensor

Details Developer material level sensor Developer material level sensor

1980-03-03

1981-09-29

Caldwell, Sr., John W.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350 61, G01N 2126

Patent

active

042925304

ABSTRACT:
Apparatus for providing an electrical signal when developer material for a copy machine recedes to predetermined level in a container for the material. The apparatus is positioned within the container and includes a light generating means directing light to a light to electric transducer. A cleaning member carried by a rotating arm is included which with rotation of the arm displaces any developer material that is present between the light generating means and the transducer means.

REFERENCES:
patent: 1937721 (1933-12-01), Simon et al.
patent: 1937722 (1933-12-01), Simon et al.
patent: 1969626 (1934-08-01), Simon et al.
patent: 2866379 (1958-12-01), Veit
patent: 2892378 (1959-06-01), Canada
patent: 3593842 (1971-07-01), Berg
patent: 3644914 (1972-02-01), Veasaw et al.
patent: 3731091 (1973-05-01), Rosso et al.
patent: 3873197 (1975-03-01), Whited
Bilevel Optical Ink Level Detector by J. T. Loiselle; IBM Tech. Discl. Bull.; vol. 18, No. 4; p. 1095-1096; Sep. 1975.

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