Apparatus for detecting abnormalities in a work holder

Details Apparatus for detecting abnormalities in a work holder Apparatus for detecting abnormalities in a work holder

1997-10-16

1999-07-27

Raevis, Robert

Measuring and testing

Dynamometers

Responsive to force

G01L 100

Patent

active

059293462

ABSTRACT:
An apparatus that improves safety by detecting work gripping abnormalities in a work holder. A rod 21a of an air cylinder 21 vertically moves and a work holder 34 opens and closes by the movement of the upper movable gripping arm 34a using the rotation point 34c as a fulcrum. A strain gauge 4 is affixed to the upper surface of the upper movable gripping arm 34a. The detection results of this strain gauge 4 are sent to a determination device 2 via a strain amplifier 3. When this detection result exceeds an abnormal level, the determination device 2 determines a work gripping abnormality and transmits a work holder abnormality signal to an NC device 1. When the NC device 1 receives an abnormality signal, is quickly carries out processes which stop the machine.

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patent: 5467656 (1995-11-01), Teare et al.
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