Measuring and testing – With fluid pressure – Dimension – shape – or size
Patent
1995-04-21
1996-07-30
Brock, Michael J.
Measuring and testing
With fluid pressure
Dimension, shape, or size
34081545, G01B 1312
Patent
active
055400825
ABSTRACT:
A positioning detector detects whether a workpiece has been positioned on a reference surface even when the pressure of a fluid supplied from a fluid pressure source and applied to the workpiece varies. A fluid is jetted from a nozzle toward a surface of the workpiece, and a back pressure of the fluid developed behind the nozzle is detected. A fluid pressure bridge is composed of the nozzle, a variable restriction, and a pair of fixed restrictions, and is connected to a semiconductor pressure sensor for detecting the difference between the back pressure and the pressure of a fluid vented through the variable restriction. The semiconductor pressure sensor has output terminals connected to a plurality of comparators for comparing the pressure difference detected by the semiconductor pressure sensor with respective different thresholds. Depending on the detected pressure difference, the comparators produce a different combination of output signals to selectively energize a plurality of light-emitting diodes for allowing the user to visually confirm the positioning of the workpiece with respect to the reference surface.
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Okuyama Tomoyuki
Takebayashi Takashi
Brock Michael J.
SMC Kabushiki Kaisha
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