Safety apparatus determining whether a detected presence is a wo

Details Safety apparatus determining whether a detected presence is a wo Safety apparatus determining whether a detected presence is a wo

1994-03-02

1995-06-27

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With protective or reliability increasing features

318467, 318445, 901 47, 901 49, 340507, 3644742, 361 78, G05B 902, G06F 1546

Patent

active

054282799

ABSTRACT:
A safety apparatus wherein a sensor (10.sub.n through 15.sub.n, 16) for transmitting object (M) detection information as a reduction in the output signal energy, is used as a human detection sensor, while a sensor (21-26) for transmitting object (M) detection information as an increase in the output signal energy is used as a work piece detection sensor, and drive of a mechanical moving portion is permitted only when the logical OR output of both sensors has a logical value of "1" corresponding to the high energy condition, thereby reliably ensuring excellent operator safety in a fail-safe manner.

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patent: 4994977 (1991-02-01), Tsujido
patent: 5161107 (1992-11-01), Mayeaux et al.
patent: 5212645 (1993-05-01), Wildes et al.

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