Chuck apparatus
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United States of America Patent
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Jan 24, 2012
Grant Date -
Jul 17, 2008
app pub date -
Jan 15, 2008
filing date -
Jan 16, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A piston is displaced by a pressure fluid supplied to a chuck body, whereupon a pair of first and second fingers that constitute a gripping member are operated to open and close along a base body. Further, a shaft-shaped bobbin is inserted through the interior of the first and second fingers, and a coil is wound around a small diameter portion of the bobbin. Accompanying opening/closing operations of the first and second fingers, an opening/closing amount thereof is detected based on a change in impedance of the coil.
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