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Apparatus for controlling the alignment, in a lateral (cross-track) direction, of a web moving along a path to minimize lateral deviation between successive discrete areas of such web. The apparatus includes a steering roller for supporting the web for movement along such path. The steering roller i

Apparatus for controlling the alignment, in a lateral (cross-track) direction, of a web moving along a path to minimize lateral deviation between successive discrete areas of such web. The apparatus includes a steering roller for supporting the web for movement along such path. The steering roller is rotatable about an axis perpendicular to the plane of the span of the web approaching the steering roller. As the web moves along the path, the lateral position of a marginal edge of the web relative to a reference plane is sensed. When such lateral edge position is at either of two spaced predetermined locations relative to such reference plane, signals indicative of the presence of such edge at such locations are produced. The steering roller, in response to such signals, is rotated about the axis perpendicular to the plane of the span of the web approaching the steering roller to steer the web and thereby cause the lateral position of the edge of the web to progress from the predetermined location at which the edge was sensed to the other predetermined location as the web moves along its path.

대표청구항 ▼

Apparatus for controlling alignment, in a lateral direction, of a web moving along a path, said apparatus comprising: at least one roller for supporting said web for movement along such path, said roller being a web steering roller mounted for rotation about an axis perpendicular to the plane of the

Apparatus for controlling alignment, in a lateral direction, of a web moving along a path, said apparatus comprising: at least one roller for supporting said web for movement along such path, said roller being a web steering roller mounted for rotation about an axis perpendicular to the plane of the span of said web approaching said steering roller; means for sensing the lateral position of an edge of said web relative to a reference plane, as said web moves along such path, said sensing means producing a first signal proportional to the lateral position of said edge at or beyond a first predetermined location spaced from such reference plane and producing a second signal proportional to the lateral position of said edge at or beyond a second predetermined location spaced from such reference plane and from said first location; and means for rotating said steering roller about said axis in either of two opposite directions, said rotating means being responsive to said first signal to rotate said steering roller in one direction an amount proportional to said first signal to steer said web for moving said edge toward said second location, and responsive to said second signal to rotate said steering roller in the other direction an amount proportional to said second signal to steer said web for moving said edge toward said first location, whereby said edge progresses laterally substantially between said first and second locations as said web moves along such path.