Method and apparatus for aligning a fabric ply in a sewing machine
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United States of America Patent
Stats
-
Jun 4, 1991
Issued Date -
N/A
app pub date -
May 1, 1989
filing date -
May 20, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus are provided for aligning one or more plies of material moving in a predetermined direction, and preferably through a desired path of travel, prior to stitching in a sewing machine. A friction wheel or other guide element is provided for applying a force to the ply having a component in a direction transverse to the direction of travel and sensors are provided for sensing the transverse position of the ply at the point where the sensor is located relative to the desired transverse position at that point. The sensor outputs are weighted, and where two or more sensors are provided, the sensor outputs are combined in a predetermined manner. The combined and weighted outputs are then utilized to control the transverse force applied by the guide element to the ply. The operating speed of the sewing machine may be utilized either as an additional input to control transverse force or to control the rate at which adjustments are made to the transverse force.
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Cited Art Landscape
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