Intrusion detector for press brake

Details Intrusion detector for press brake Intrusion detector for press brake

H - Electricity

04

B

340/102, 340/77,

H04B 1/62 (2006.01) H04B 1/10 (2006.01) H04B 3/00 (2006.01) H04B 3/28 (2006.01) H04B 15/00 (2006.01)

Patent

CA 1128161

INTRUSION DETECTOR FOR PRESS BRAKE 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 stop- ping the machine only when two or more adjacent light beams are obstructed causing two or more successive miss- ing pulses in the pulse train.

344806

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