Method of and apparatus for controlling lateral deviations of a travelling fabric web
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United States of America Patent
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Oct 24, 1995
Grant Date -
N/A
app pub date -
Oct 27, 1993
filing date -
Oct 28, 1992
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Abstract
The travel of a fabric web is corrected by an image acquisition from a region thereof including a guidance criterium which can be interrupted to produce a single row of image points, the signals of which are digitalized and compared with a reference signal by relative shifting of the stored signals in two shift registers. The number of shifts required to bring about correlation is determined as a measure of the actual position of the web and compared to a setpoint position for operation of an effector restoring the web to its set point position.
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