Method and apparatus for detecting and for counting any instanta

Details Method and apparatus for detecting and for counting any instanta Method and apparatus for detecting and for counting any instanta

1992-07-14

1993-03-23

Smith, Jerry

Boots, shoes, and leggings

369563, 36957105, 356376, 356430, 250560, 250562, G01N 2189, G01N 2186

Patent

active

051970120

ABSTRACT:
The invention consists in using a transmitter (23) of light to reproduce, in the plane of an optical detector (24), the profile of an object or a set of objects in contact or overlapping on a conveyor belt (21), e.g. newspapers (20), the profile being reproduced in the form of a function Y=f(X), then in scanning the profile by means of two receivers (27, 28) delimited by two slots (30, 31) in such a manner that the intersections of the function Y and the lines representing the two receivers are reduced approximately to two points with the distance between the two points being as small as possible, and finally in permanently determining the derivative Y'(X) and in actuating an electronic circuit associated with the detector (24) to generate an output signal proportional to the value of the derivative Y'(X). When used for detecting and counting, the output signal is compared with a predetermined value representative of an intantaneous variation (22) of the profile, and a pulse is emitted when the output signal exceeds the predetermined value. The invention is also applicable to detecting breaks in threads.

REFERENCES:
patent: 3594558 (1971-07-01), Koepfe
patent: 3907439 (1975-09-01), Zanoni
patent: 4450352 (1984-05-01), Olsson
patent: 4549086 (1985-10-01), Herzer
patent: 4894551 (1990-01-01), Kishimoto et al.

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