Method and apparatus for detecting overlapping products in a sin

Details Method and apparatus for detecting overlapping products in a sin Method and apparatus for detecting overlapping products in a sin

1992-04-06

1993-04-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250560, 235462, G01N 904

Patent

active

052025578

ABSTRACT:
A singulated stream of products comprised of both single and overlapping products is transported through a scanning zone along a transport path. Each single or overlapping product defines a shadow on the transport path that is analyzed to determine the presence of product multiples in the product shadow by measuring the width and length of the product shadow. If the length of the product shadow exceeds by more than a predetermined amount the average length of previously measured shadows having a similar width, the shadow likely contains two or more overlapping products. As the product shadow moves through the scanning zone, each product included therein is scanned for affixed bar codes by a plurality of bar code scanners. If two different bar codes or two identical bar codes from mutually exclusive scanners are recorded for a single product shadow, then the shadow likely contains two or more overlapping products.

REFERENCES:
patent: 3745354 (1973-07-01), Vargo
patent: 3822009 (1974-07-01), Richards
patent: 4193540 (1980-03-01), Dougados et al.
patent: 4634849 (1987-01-01), Klingen
patent: 4717026 (1988-01-01), Fischer
patent: 4832204 (1989-05-01), Handy
patent: 5118929 (1992-06-01), Scata

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