Method and apparatus for controlling a moving web

Details Method and apparatus for controlling a moving web Method and apparatus for controlling a moving web

1975-10-24

1978-01-17

Stoner, Jr., Bruce H.

Advancing material of indeterminate length

Processes

Involving registration of material

26 515, 26105, 198840, 226 15, 226 17, B65H 2302

Patent

active

040687899

ABSTRACT:
Apparatus is disclosed for controlling the position of a moving web. The web passes between a driven roll and a pair of pressure applicators that are positioned on either side of center of the web path. Edge sensors are located adjacent the driven roll and are operatively connected with the pressure applicators. Once the web misalignment is sensed, the opposite pressure applicator is actuated to apply pressure against the web. The driven roll, preferably a scroll roll, then drives the web in the direction of the pressure applicator until the web returns to proper alignment and the pressure applicator is deactuated. The pressure applicator is preferably a device that is brought into contact with the web and applies frictional forces thereon to cause movement of the web along the roll, while avoiding any substantial frictional forces axially with respect to the normal web path. Structure is also disclosed to uncurl rolled selvages of a moving web. A method of controlling lateral position of a moving web is also disclosed and claimed herein.

REFERENCES:
patent: 739781 (1903-09-01), Green
patent: 1005801 (1911-10-01), Birch
patent: 1678925 (1928-07-01), Tackaberry
patent: 1769687 (1930-07-01), Hamilton
patent: 3727820 (1973-04-01), Braun
patent: 3774271 (1973-11-01), Depuy et al.
Sorsen S. L., "17 Ways to Track the Edge", Control Engineering, May 1964, pp. 77-80.

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