Trouble detecting unit in an optical security device

Details Trouble detecting unit in an optical security device Trouble detecting unit in an optical security device

1978-06-26

1982-01-05

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

With particular system function

340516, 340518, 340555, 340679, 250200, 361174, 192129R, 192134, G08B 2900, F16D 900

Patent

active

043096964

ABSTRACT:
A trouble detecting unit in an optical security device intentionally produces a state which is equivalent to a state in which the security system is out of order so as to check whether an emergency stop signal is produced or not and judges that the security system is in order if the emergency stop signal is produced and that the security system is out of order if the emergency stop signal is not produced. This checking is made while the security system need not be in operation. In a press, for example, the checking is made while the press is being lifted from a bottom dead center. A state which is equivalent to the one in which the security system is out of order is produced by intercepting, one by one, signals to light emitting elements or signals from light receiving elements.

REFERENCES:
patent: 3668674 (1972-06-01), Westendorf
patent: 3886413 (1975-05-01), Dow et al.
patent: 3970846 (1976-07-01), Schofield
patent: 4118688 (1978-10-01), Glennon

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