System and method for sensing a paper roll ultrasonically
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United States of America Patent
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Dec 16, 2008
Grant Date -
Mar 27, 2008
app pub date -
Sep 21, 2006
filing date -
Sep 21, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for sensing paper on a paper roll is disclosed. The method comprises transmitting an ultrasonic signal into the paper roll and detecting an ultrasonic return echo transmit signal from the paper roll, the ultrasonic return echo transmit signal resulting from the ultrasonic signal interacting with the paper roll. Moreover, the method comprises determining an amount of paper remaining on the paper roll in response to the ultrasonic return echo transmit signal. Furthermore, the method may comprise indicating that the paper roll needs to be replaced in response to determining the amount of paper remaining on the paper roll.
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