Sewing – Elements – Frames
Patent
1989-05-01
1991-06-04
Nerbun, Peter
Sewing
Elements
Frames
112153, 112306, 226 17, D05B 3510, D05B 2100
Patent
active
050204602
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.
REFERENCES:
patent: 3013513 (1961-12-01), Judelson
patent: 4159687 (1979-07-01), Masuda et al.
patent: 4653414 (1987-03-01), Harrington
patent: 4660481 (1987-04-01), Spickermann
patent: 4757773 (1988-07-01), Nomura et al.
patent: 4825787 (1989-05-01), Babson et al.
Babson Edward S.
Brophy Thomas G.
Porter Michael R.
Nerbun Peter
Porter Sewing Machines, Inc.
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