AUTOMATED UPPER/LOWER HEAD CROSS DIRECTION ALIGNMENT BASED ON MEASUREMENT OF SENSOR SENSITIVITY
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United States of America Patent
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Issued Date -
Feb 25, 2016
app pub date -
Aug 22, 2014
filing date -
Aug 22, 2014
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Abstract
A method includes moving a first sensor assembly to a plurality of cross direction positions relative to a second sensor assembly, where the first and second sensor assemblies are configured to move in the cross direction relative to a web of material. The method also includes, for each of the plurality of cross direction positions, determining a sensor value associated with a sensor source disposed at the second sensor assembly as measured by a sensor receiver disposed at the first sensor assembly. The method further includes determining a starting alignment position of the first sensor assembly to be a first cross direction position where a difference between the sensor value at the first cross direction position and a corresponding sensor value at one or more adjacent cross direction positions is a minimum.
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