Apparatus and method for sensing the presence of moving objects

Details Apparatus and method for sensing the presence of moving objects Apparatus and method for sensing the presence of moving objects

1990-09-19

1992-07-14

Heyman, John S.

Oscillators

With device responsive to external physical condition

271263, 340562, 307526, 307308, 377 8, B65H 706, G06K 1100

Patent

active

051306727

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.

REFERENCES:
patent: 3020473 (1962-02-01), Cauley
patent: 3683351 (1972-08-01), Wilcox
patent: 3720934 (1973-03-01), Sibeud
patent: 4228393 (1980-10-01), Pile
patent: 4243216 (1981-01-01), Mazumder
patent: 4358749 (1982-11-01), Clark
patent: 4368438 (1983-01-01), Stienstra
patent: 4567437 (1986-01-01), Hubbard

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