Method for controlling the operation of an optical scanner

Details Method for controlling the operation of an optical scanner Method for controlling the operation of an optical scanner

1981-11-13

1984-02-14

Pellinen, A. D.

Registers

Coded record sensors

Particular sensor structure

235463, 235462, 235457, 235455, G06K 710

Patent

active

044319126

ABSTRACT:
An optical scanner in a retail store checkout stand includes a single item detector upstream of the scanner window. Output signals from the item detector and from symbol recognition logic are used to open and close a shutter in the beam path of the scanner laser. The shutter is opened and a first time out sequence is started when the beam path is interrupted. A second, short time out sequence is restarted each time a valid symbol is recognized. A third time out sequence of intermediate length supersedes the first time out sequence when the beam path is cleared. The laser shutter is closed and the symbol is transferred to a terminal or controller upon the completion of any active time out sequence or upon recognition of a predetermined number of identical symbols, whichever comes first.

REFERENCES:
patent: 3582617 (1971-06-01), Berler
patent: 3961162 (1976-06-01), Wells
patent: 3973107 (1976-08-01), Walter
patent: 4157783 (1979-06-01), Muster et al.
patent: 4298859 (1981-11-01), Feilchenfeld
patent: 4329574 (1982-05-01), Jordan, Jr.
patent: 4342050 (1982-07-01), Traino

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