Web aligning apparatus for multi-level web material

摘要

A web aligning apparatus for use with multi-level web material such as carpeting, tufted fabrics and the like having a backing web and a pile on the backing web inwardly of a side edge of the backing web. The web aligning apparatus includes a pile engaging member mounted at a sensing location along the course of travel of the web for movement along a first path crosswise of the course of web travel and generally parallel to the face of the web at the sensing location to sense lateral deviations of the course of travel of the pile edge from a preselected position. The pile engaging member is also mounted for movement along a second arcuate path generally tangent to the web from a first position extending alongside the web backing at the sensing location toward a second position displaced along the arcuate path in the direction of travel of the web when the pile engaging member rides onto the pile. A first motion detector detects movement of the pile engaging member along the first path and a second motion detector detects movement of the pile engaging member along the second arcuate path.