Communications: electrical – Systems – Call station
Patent
1976-05-04
1978-02-07
Swann, III, Glen R.
Communications: electrical
Systems
Call station
57 81, 66163, 1393701, G08B 2100
Patent
active
040729354
ABSTRACT:
A plurality of signal generators are provided, one signal generator being associated with each object for example threads, strips, or the like whose motion is to be detected. Each signal generator generates an electric signal upon detection of movement of its associated object. The signal generators are connected in a series circuit, each end of which is connected to the input of a separate signal amplifier. The connections between adjacent signal generators in the series circuit are successively grounded. The signal amplifiers have their outputs connected to a gate circuit, the output of which is connected to the device for successively grounding the signal circuit connections so that, if a signal is generated simultaneously by at least one signal generator on each side of the grounded connection, operation is interrupted.
REFERENCES:
patent: 2711093 (1955-06-01), Edelman et al.
patent: 3688958 (1972-09-01), Rydborn
patent: 3911969 (1975-10-01), Rydborn
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