Protective arrangement for a longitudinally extendible machine c

Details Protective arrangement for a longitudinally extendible machine c Protective arrangement for a longitudinally extendible machine c

1989-10-03

1991-08-13

Will, Thomas B.

Geometrical instruments

Gauge

Coordinate movable probe or machine

33501, 409134, 901 49, G01B 520

Patent

active

050384880

ABSTRACT:
The invention is directed to a protective arrangement for a longitudinally extendible machine component such as the measuring arm of a machine such as a coordinate measuring apparatus. The protective arrangement includes a bellows which at least partially surrounds the machine component and has a plurality of structural parts at least one of which is deflectable relative to the longitudinal axis of the machine component in response to a contact of the bellows with an object or person. Each of the structural parts has a cutout formed therein and the parts are disposed in the bellows so as to cause the cutouts to be mutually aligned in the undeflected condition of the bellows. A light barrier directs a light beam through the cutouts which becomes at least partially shaded in response to a deflection of the one structural part. The light barrier generates a signal in response to the shading and this signal is supplied to a protective circuit in the control unit of the machine which can, for example, initiate an emergency stoppage of the machine component thereby preventing damage.

REFERENCES:
patent: 4175327 (1979-11-01), Herzog
patent: 4332989 (1982-06-01), Nicolaisan
patent: 4575947 (1986-03-01), Stauber
patent: 4713892 (1987-12-01), Strauss
patent: 4915574 (1990-04-01), Park et al.

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