Web defect monitor for abrupt changes in web density

Details Web defect monitor for abrupt changes in web density Web defect monitor for abrupt changes in web density

1975-08-06

1977-03-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214RC, 356200, G01N 2132

Patent

active

040114570

ABSTRACT:
An electro-optical scanner for detecting variations in a web and generating output signals representative of the variations is provided with discriminator logic and alarm circuitry that indicates when the output signals shift from a value exceeding a predetermined positive (negative) threshold value to a value beyond a predetermined negative (positive) threshold value within a prescribed minimum period of time as an occurrence of an abrupt change in web density and processing circuitry for determining and indicating when the number of such occurrences per unit time exceeds a threshold or predetermined number.

REFERENCES:
patent: 2812447 (1957-11-01), MacMartin et al.
patent: 3056032 (1962-09-01), Cannon
patent: 3257563 (1966-06-01), Laurent
patent: 3389789 (1968-06-01), Watson et al.

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