Importance

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Abstract

In a label-sensing device that detects movement of a label reel during a label-feeding operation of a labeling machine, an infrared transmitter generates a sensing light output with an intensity that corresponds to a predetermined regulated DC voltage output that is supplied by a power supplying circuit. The sensing light output is directed by the transmitter so as to pass through one end of the label reel before being received by an infrared receiver. The receiver has a detected output with a weaker first intensity upon detection of a first portion of the label reel where a label overlaps with a backing paper strip, and with a stronger second intensity upon detection of a second portion of the label reel where no label overlaps with the backing paper strip. A voltage amplifier amplifies the detected output of the receiver. A controller converts the output of the voltage amplifier into a corresponding detected value, and compares the detected value with an initial reference value to determine which of the first and second portions of the label reel was sensed by the receiver.

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First Claim