Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control
Patent
1982-05-24
1985-01-08
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Returned signal used for control
101228, 226 11, 340675, 367108, G01S 1588
Patent
active
044930658
ABSTRACT:
Method and apparatus for web break detection employing a sonic signal generator to generate regularly repetitive sonic signals of selected frequency, duration and time spacing between signals and disposed to direct the sonic signals toward a moving web of selected material so the signals are reflected from the web, a receiver device to receive the reflected signals, a time signal generating device to generate signal pulses during the time period between the generation of a sonic signal and receipt of the reflected signal a counter device to count the time generated between the transmission of the sonic signal and the reflected signal so that the number of time signals generated is indicative of the presence of the web as well as the distance of the web from the signal generator and receiver and a logic system to actuate a cutter mechanism to cut the web if it should fall outside a preselected "window" in which the web is positioned.
REFERENCES:
patent: 3588795 (1971-06-01), Linardos et al.
patent: 3733582 (1973-05-01), Eck et al.
patent: 3928844 (1975-12-01), Meihofer
patent: 4121094 (1978-10-01), DiVito et al.
patent: 4122429 (1978-10-01), Hatai
Schall et al., IBM Tech. Disclosure Bulletin, vol. 24, No. 7B, Dec. 1981, pp. 3590, 3591.
Farley Richard A.
Steutermann Edward M.
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