Apparatus and method for sensing the presence of moving objects
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United States of America Patent
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Jul 14, 1992
Issued Date -
N/A
app pub date -
Sep 19, 1990
filing date -
Apr 22, 1987
priority date (Note) -
Expired
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Abstract
A sensor, especially for detecting misfeeds in a stream of sheets of paper, comprises a pair of sensing plates sensing changes in the capacitance between the plates, a first oscillator providing an output signal at a frequency representative of the capacitance, a second oscillator set to a reference frequency which is the same as or close to that frequency generated by the first oscillator when no object is between the sensing plates, gating means to produce an output representative of the frequency difference between the oscillator outputs, a low-pass filter, and a microprocessor which responds to changes in the difference frequency.
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