Magnetic workpiece handling devices
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United States of America Patent
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Nov 5, 2013
Grant Date -
Jun 21, 2012
app pub date -
Dec 15, 2011
filing date -
Dec 17, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
In some aspects, a magnetic workpiece handling device includes a housing, a housing bottom having an end face, a magnetic piston, and a fluid connection for delivering a working fluid into the housing for moving the piston between an operating position and a rest position. The working fluid is delivered at at least first and second working pressures, the first working pressure transferring the piston into the operating position near the housing bottom and the second working pressure transferring the piston into the rest position away from the housing bottom. The handling device includes a detection device to detect the presence of a workpiece and to determine a pressure of the working fluid. The piston has a vertically movable holding magnet that faces the housing bottom for holding the workpiece. The holding magnet controls a valve arrangement of the detection device.
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