Method and apparatus for counting overlapping obects

Details Method and apparatus for counting overlapping obects Method and apparatus for counting overlapping obects

1989-04-26

1990-11-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250223R, 377 53, G01V 904

Patent

active

049720716

ABSTRACT:
Apparatus and a method for counting primarily printed copy being advanced along a path in an overlapping manner is arranged to direct two beams of infra-red radiation on to a predetermined region in the path of advancement of the copy. The two beams are distinguishable and are directed from positions respectively upstream and downstream of said region. Two detectors are disposed above said region, to receive radiation from two distincts areas respectively, both within said region, but spaced in the direction of the path of advancement of the copy. Suitable processing of the detector outputs, to determine the gradients of the said areas, allows the generation of a count signal as the leading edge of an object passes through said region.

REFERENCES:
patent: 3414732 (1968-12-01), Stegenga
patent: 3737666 (1973-06-01), Dutro
patent: 4027155 (1977-05-01), Rappaport
patent: 4217491 (1980-08-01), Dufford, Jr. et al.
patent: 4286149 (1981-08-01), Ben-Nathan et al.
patent: 4365151 (1982-12-01), Fasig et al.
patent: 4450352 (1984-05-01), Olsson
patent: 4778986 (1988-10-01), Lundberg et al.

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