Position detector for workpiece-machining apparatus
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United States of America Patent
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-
Jan 18, 1994
Grant Date -
N/A
app pub date -
Dec 9, 1992
filing date -
May 4, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A workpiece-position detector used in combination with a workpiece having a face and with a support having a surface adapted to engage the workpiece face has an element at the surface formed with a passage having a mouth open generally at the surface and blockable by the face of the workpiece, a flexible hose connected to the passage of the element, and a feed line connected to the hose. A pump connected to the feed line supplies a gas under pressure to the hose so that the gas exits from the passage mouth when same is not blocked. A restriction is provided in the feed line and a pressure sensor in the feed line downstream of the restriction produces an output corresponding to pressure in the conduit so that when the mouth is blocked the pressure at the sensor is relatively high and when not blocked it is relatively low. A controller connected to the pressure sensor takes action when the pressure sensor detects the relatively low pressure.
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