Advancing material of indeterminate length – Plural material-moving means – With bight former
Patent
1994-07-26
1996-09-24
Darling, John P.
Advancing material of indeterminate length
Plural material-moving means
With bight former
226 15, 226 21, 226199, B65H 23035
Patent
active
055582630
ABSTRACT:
A moving web in a conveyance machine is tensioned and steered without contact of the web to the machine a pair of parallel air bars in a single moveable frame which is adapted to pivot controllably about two intersecting orthogonal axes in a plane through the air bars. Separate feedback control systems monitor the tension and position of the web and adjust the orientation of the frame about each axis to adjust tension and lateral position of the web independently and continuously. Additional fixed air bars on opposite sides of the web in the web path between the moveable air bars provide high and unvarying web wrap angles on the moveable air bars to increase the tension and steering operating range and sensitivity. An additional moveable air bar is provided downstream of the pair of moveable air bars and is adapted to pivot controllably about another axis orthogonal to the direction of the tensioning and steering axes whereby the axial direction of the moving web can be changed.
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Technical Brochure dated Apr. 1991, by the Kohler Coating Machinery Corp., Greentown, OH 44630 USA.
Darling John P.
Eastman Kodak Company
Parulski Susan L.
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