Monitoring device for monitoring the passage of objects through

Details Monitoring device for monitoring the passage of objects through Monitoring device for monitoring the passage of objects through

1994-05-26

1996-03-19

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340568, G01V 904

Patent

active

055005268

ABSTRACT:
A supermarket trolley monitoring system is provided for detecting shopping items on a lower shelf of the trolley as the trolley moves through a check-out station. Three transmitter/receivers are provided. The first and third at level A respond to light reflected by a panel 36 on the side of the trolley. The system is turned on when the panel 36 passes the first transmitter/receiver and off when the panel 36 passes the third transmitter/receiver. The second transmitter/receiver is mounted above A and if any object is detected while the system is ON, by reflection of the beam from the object, a warning is provided to alert a check-out assistant and/or a shopper that an item is present on the lower trolley shelf which may not have been entered in a till.

REFERENCES:
patent: 3457423 (1969-07-01), Gravely
patent: 3725894 (1973-04-01), Geisler
patent: 4338594 (1982-07-01), Holm

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