Photoelectric barrier, particularly useful as an accident-preven

Details Photoelectric barrier, particularly useful as an accident-preven Photoelectric barrier, particularly useful as an accident-preven

1979-08-14

1982-01-12

Swann, III, Glen A.

Communications: electrical

Condition responsive indicating system

Specific condition

250221, 340512, 340515, 340516, 340679, 361176, G08B 2100

Patent

active

043108369

ABSTRACT:
A photoelectric barrier comprises an emitter emitting a movable modulated beam which scans periodically at a high rate an area to be protected. The beam is then redirected to a photoelectric receiver supplying the signal deactivating the machine controls. The barrier also comprises a circuit generating pulses which are effective to suppress some of the pulses emitted by the photoelectric emitter in order to monitor the machine operation during scanning, the suppression pulses being produced by detecting the correct rotation of the scanning motor.

REFERENCES:
patent: 3119103 (1964-01-01), Fertig
patent: 3509359 (1970-04-01), Embling
patent: 3543260 (1970-11-01), Engh
patent: 3928849 (1975-12-01), Schwarz
patent: 3970846 (1976-07-01), Schofield, Jr. et al.
patent: 4127771 (1978-11-01), Sick

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