Method for initializing the position of a linear drive system
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United States of America Patent
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Jun 10, 1997
Grant Date -
N/A
app pub date -
Nov 28, 1994
filing date -
Nov 28, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A thermoplastic bag making machine having a sealing bar assembly driven by two separate linear drive units is initialized following full shutdown by traversing the linear drive units at constant velocity against mechanical stops, and then resetting position error signals and traversing the bar a known distance to a home position. This procedure is also useful for single linear drive units, as well as multiple linear drive units that must be coordinated for position and motion. In the case of multiple drive units, procedure for offsetting travel distances off the stop for non-uniformity in stop positions is utilized.
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