Conveyors: power-driven – With alarm or indicator – Means for measuring dimensions of load on a conveyor
Patent
1982-03-01
1984-03-13
Heyman, John S.
Conveyors: power-driven
With alarm or indicator
Means for measuring dimensions of load on a conveyor
198810, 198856, 340676, 364550, 307311, 307515, B65G 4306
Patent
active
044361980
ABSTRACT:
Existing conveyor belt rip detection systems presently incorporate a synchronous detector circuit for increasing the rejection of electrical noise. In order for the detector circuit to work at peak efficiency, the input signal occurring when an antenna is over the detector probes must be tuned in phase with the reference signal. The circuit to effect such tuning includes a light emitting diode as an indicator for determining the optimum phase tuning of the oscillator signal through the probes and antennae to a related synchronous detector for achieving maximum signal to noise ratio. A thumb wheel switch is employed to shift the phase of one of the signals with respect to the other to effect the tuning while the light emitting diode is utilized to detect when the thumbwheel switch has shifted the signals into an optimum synchronous relationship.
REFERENCES:
patent: 3731113 (1973-05-01), Lowe et al.
patent: 3845375 (1974-10-01), Stiebel
patent: 4106005 (1978-08-01), Asakawa
patent: 4228513 (1980-10-01), Doljack
Houck Robert J.
King Kevin J.
Colitz, Jr. M. J.
Heyman John S.
The B. F. Goodrich Company
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