Method of and apparatus for controlling lateral deviations of a

Details Method of and apparatus for controlling lateral deviations of a Method of and apparatus for controlling lateral deviations of a

1993-10-27

1995-10-24

Stodola, Daniel P.

Advancing material of indeterminate length

With material-responsive control means

To position material laterally

226 3, B65H 23032, G05D 320

Patent

active

054603129

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.

REFERENCES:
patent: 4075604 (1978-02-01), Degasperi
patent: 4135664 (1979-01-01), Resh
patent: 4600837 (1986-08-01), DiStefano et al.
patent: 4782238 (1988-11-01), Radl et al.
patent: 4922337 (1990-05-01), Hunt et al.
patent: 5058793 (1991-10-01), Neville et al.

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