Bar code reader

Details Bar code reader Bar code reader

1979-05-21

1981-06-30

Cook, Daryl W.

Registers

Coded record sensors

Particular sensor structure

235493, 250569, G06K 710, G06K 1906, G08C 906

Patent

active

042764700

ABSTRACT:
A single sensor system reads a traveling bar code comprising a plurality of marks separated by spaces. Each of the marks may have either of two durations and each of the spaces has a uniform duration. The bar codes are transported, relative to the sensor, at any of many different speeds so that the signals generated by the sensor may have unpredictable durations. The inventive reader determines the speed at which the bar code is being transported and interprets the signals generated by the bar code marks according to the determined speed. As used herein, the reference to "any of many different speeds" recognizes that different bar code transport devices, owing to their own inherent characteristics, may operate at different speeds although the speed for any given code transport device will tend to be fairly uniform. In some embodiments, the invention accommodates speed fluctuations in the operation of a single transport device.

REFERENCES:
patent: 3229073 (1966-01-01), Macker
patent: 3331947 (1967-07-01), Johnson
patent: 3700858 (1972-10-01), Murthy
patent: 3701886 (1972-10-01), Jones
patent: 3752963 (1973-08-01), Herrin
patent: 3783245 (1974-01-01), Howell
patent: 3798458 (1974-03-01), Buckingham
patent: 3891831 (1975-06-01), Coles
patent: 4114031 (1978-09-01), Bushman
patent: 4127770 (1978-11-01), Baader

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