| 摘要 |
A monitoring system for a shopping trolley in a self-service store, the trolley having a support surface below the basket for the goods, which support surface is not normally visible to the check-out operator, comprises a transmitter/ receiver (F2) to detect an article (7) on the support surface, a further transmitter/receiver (F1) disposed at a lower level than (F2) to block operation of the transmitter/receiver (F2) in response to detection of the legs of the customer, parts of the trolley running gear and the like, and a device to provide a visual and/or audible signal in response to operation of the transmitter/receiver (F2). <IMAGE> |
