Photosensitive switch with circuit for indicating malfunction

Details Photosensitive switch with circuit for indicating malfunction Photosensitive switch with circuit for indicating malfunction

1990-08-06

1992-09-01

Coles, Sr., Edward L.

Communications: electrical

Condition responsive indicating system

Specific condition

340644, 250571, 2502221, G08B 2100

Patent

active

051442868

ABSTRACT:
An alarm for a photosensitive detector used for detecting registration marks on a web or the like measures the voltage levels of an intensity signal derived from the registration marks and the background as it moves past the photosensitive switch. Pulses that are sufficient to operate the photosensitive switch but are below a level deemed to indicate reliable operation are counted and set an alarm if a predetermined number occur without an intervening pulse of a higher amount.

REFERENCES:
patent: 4119843 (1978-10-01), Hinds
patent: 4347438 (1982-08-01), Spielman
patent: 4388527 (1983-06-01), Fukuyama et al.
patent: 4465998 (1984-08-01), Durand
patent: 4559453 (1985-12-01), Muggli et al.
patent: 4757306 (1988-07-01), Kimura
patent: 4782224 (1988-11-01), Haas et al.
patent: 4982412 (1991-01-01), Gross

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