Print pitch correcting apparatus for plastic film
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United States of America Patent
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Jan 19, 2016
Grant Date -
Apr 10, 2014
app pub date -
Oct 2, 2013
filing date -
Oct 5, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
It is intended to correct print pitches P at which a pattern A is printed on a plastic film 1 repeatedly. A first optical sensor detects positions at which the pattern A is printed on the plastic film 1 repeatedly, to measure the print pitches P individually. A first stretching device 4 stretches the plastic film 1 after measuring the print pitch P to correct the print pitches P individually. A second optical sensor detects the positions after correcting the print pitch P to measure a sum of print pitches P(1)+P(2)+ - - - +P(N) of a number of patterns A. A second stretching device 10 stretches the plastic film 1 after measuring the sum of print pitches to correct the sum of print pitches.
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