Vacuum sizing apparatus with controlled vacuum
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United States of America Patent
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-
Aug 23, 1994
Grant Date -
N/A
app pub date -
Jul 19, 1993
filing date -
Jul 19, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A vacuum sizing apparatus with a controlled vacuum is provided. The vacuum is precisely controlled by the use of a variable speed motor driven vacuum pump and a step motor controlled vent valve. An electrical circuit containing a microprocessor coordinates the speed of the motor driven vacuum pump with the position of the vent valve to give precise vacuum control within the vacuum chambers of the sizing apparatus. A closed sump tank contains water for the water system of the apparatus and is maintained at the same vacuum level as the vacuum chambers within the sizing apparatus.
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