Method and device for counting sheet material

Details Method and device for counting sheet material Method and device for counting sheet material

1983-10-05

1984-05-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

377 8, 377 53, G06M 706

Patent

active

044503520

ABSTRACT:
A laser beam, directed by mirrors at a conveyor belt with overlapping sheet products, is reflected against at least two measuring cells. Each paper edge passing the point of reflection is shown in the signals from the measuring cells, and by compositing the signals in various ways in a computer, disturbances due to varying amounts of color, thickness and form of the edges, folds etc. can be eliminated, producing a curve which exactly shows how many products have passed on the belt. Using a laser as a light source provides a parallely focusable, very powerful light beam, which makes it possible to count thin, tightly spaced and heavily colored products.

REFERENCES:
patent: 4027155 (1977-05-01), Rappaport
patent: 4112309 (1978-09-01), Nakazawa et al.
patent: 4217491 (1980-08-01), Dufford, Jr. et al.
patent: 4286149 (1981-08-01), Ben-Nathan et al.
patent: 4296314 (1981-10-01), Dabisch

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