Intrusion detector for press brake

Details Intrusion detector for press brake Intrusion detector for press brake

1978-06-06

1981-02-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340556, H01J 3900

Patent

active

042490740

ABSTRACT:
An intrusion detection system is disclosed for safeguarding an operator of an industrial machine such as a press brake. A light screen barrier (420) comprises sequentially pulsed beams (422) which are spaced far enough apart to permit penetration by a work piece (144) without obstructing more than one beam whereas penetration by the operator's hand will obstruct at least two adjacent, successively pulsed beams. A pulse train of regularly spaced signal pulses (BRS) with each pulse corresponding to a light beam is produced when none of the light beams are obstructed. A missing pulse detector (600, 40') with a logic circuit (502) produces a control signal for stopping the machine only when two or more adjacent light beams are obstructed causing two or more successive missing pulses in the pulse train.

REFERENCES:
patent: 3723738 (1973-03-01), Brenner et al.

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