Pressure sensor device and suction release apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Oct 23, 2001
Grant Date -
N/A
app pub date -
Jan 18, 2000
filing date -
Jan 18, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
When a suction/breakdown instruction signal is changed over from a high state to a low state, a vacuum generating electro-magnetic valve is turned on (the vacuum release electro-magnetic valve is closed). If the negative pressure in the pressure tube is equal to or greater than a determining value, suction breakdown confirmation output is turned on. When the delay time has lapsed from this time, the vacuum generating electro-magnetic valve is turned off. When the pressure in the pressure tube is smaller by a predetermined value than the suction determining value, the output of the suction breakdown confirmation is turned off. When the delay time has lapsed since the change-over time from the low state to the high state, the vacuum release electro-magnetic valve is turned on. When the positive pressure in the pressure tube is equal to or greater than the breakdown determining value, the output of the suction breakdown confirmation is set to the high state. When the breakdown time has passed from this time T6, the vacuum release electro-magnetic valve is turned off.
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