Method and apparatus for web steering

Details Method and apparatus for web steering Method and apparatus for web steering

1998-09-11

2000-12-26

Hilten, John S.

Printing

Rolling contact machines

Rotary

101219, 226 21, B41F 1354

Patent

active

061642010

ABSTRACT:
The present invention is directed to providing apparatus and methods for lateral position control using a web guide which detects a relative lateral shift of a web upstream of a control device. Error correction is thereby implemented using a phase advance rather than a phase lag. The lateral displacement control can be implemented continuously, or can be activated at certain times (e.g., when a new roll is spliced to an old roll, or when disturbances enter the system). The invention eliminates wasted time and wasted paper, by eliminating misalignment of a web with respect to a printing unit.

REFERENCES:
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patent: 4598849 (1986-07-01), Frye et al.
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patent: 5667123 (1997-09-01), Fukuda
patent: 5711470 (1998-01-01), Thompson
1 page illustration of Quad Tech System 2000, dated Jan. 1987.
Baldwin Web Guide Controls, Models 901/902/903, 2 pages, MC 2M Dec. 1990.
MicoTrak Series 4400, Linear Web Guide, Web Printing Controls Co., Inc. 2 pages.
CMI.CMB Digital Web Guides, Automatic Web Alignment For Maximum Productivity, Meg document, 1 page.
Extensive Range Allows Detection of Microparts, Keyence, LX2.sub.-13, Laser through-Beam Photo-Sensor Wide-Beam Type, Cat. No. NLX2-13, 2 pages.

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