Hot wire control apparatus and method
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United States of America Patent
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Aug 12, 2008
Grant Date -
Aug 23, 2007
app pub date -
Dec 26, 2006
filing date -
Dec 27, 2005
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Control system and apparatus for controlling current input to an electrical resistance element such as a seal wire. The system and apparatus of the present invention is a closed loop feedback modification to conventional systems, and takes advantage of the inherent expansion of the seal wire as it is heated. The feedback mechanism monitors both the actual current passing through the wire, and the length of the sealing wire, and adjusts the current applied to the wire, responsive to those monitored inputs. The usage of the sealing machine is also monitored and the application and amount of current flowing to the wire is varied based on this usage.
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