Communications: electrical – Systems – Call station
Patent
1975-05-05
1976-02-10
Swann, III, Glen R.
Communications: electrical
Systems
Call station
66163, 139336, 226 11, 242 37R, G08B 2100
Patent
active
039381196
ABSTRACT:
A sensing lever, preferably a double-arm lever, is journalled over a fulcrum; one arm is engaged by the thread to be supervised, and further connected to operate an electrical switch; the other arm is subject to electromagnetic force derived from an interrupted, pulsed electromagnet. Pulsed operation of the electromagnet can be obtained by a signal derived from the switch of the lever itself, or from an extraneous source; upon attraction by the magnet, the contacts are opened; during a pulse gap, the thread tension depresses the lever, thus closing the contacts; the lever will, therefore, continuously vibrate and presence of an a-c signal across the switches will be indicative of: (a) presence of thread; (b) thread tension below a predetermined limit (excessive tension would overcome the pulsed reset force of the electromagnet); and (c) proper operation (jamming of the lever would likewise result in a d-c output from the switch).
REFERENCES:
patent: 2863276 (1958-12-01), Breuning
patent: 3343008 (1967-09-01), Bancroft
patent: 3521265 (1970-07-01), Bancroft
patent: 3562734 (1971-02-01), Hotchkiss
patent: 3611342 (1971-10-01), Raaben et al.
patent: 3633197 (1972-01-01), Dunlap
patent: 3688958 (1972-09-01), Rydborn
patent: 3764773 (1973-10-01), Merkle
patent: 3890810 (1975-06-01), Domig
Siegfried Peyer
Swann III Glen R.
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