Proximity sensor having a bridge circuit with a voltage controlled resistance
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United States of America Patent
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Jan 7, 1992
Issued Date -
N/A
app pub date -
Mar 2, 1990
filing date -
May 16, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Proximity sensors for detecting the presence of metal objects such as sheet metal workpieces within workpiece engaging devices such as grippers and shovels. The proximity sensors are jacketed in a stainless steel casing, making them rugged and resistant to impact damage. Monitor circuits are used with the sensor which enable the devices to sense objects through their metal casing, these objects being disposed upon the sensor casing. A thresholding circuit and a delay circuit are further disclosed and which reduce erroneous indications of the presence of the metal objects upon the sensor. Other embodiments are disclosed which allow for the proper alignment of metallic workpieces within an area and for the determination of the height of a stack of workpieces.
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