Sewing machine having top and bottom feed synchronizing means Patent #: 3954071
ApplicationNo. 05/709051 filed on 07/27/1976
US Classes:112/470.28, Having drag clamp112/311, Clamp type112/470.31, For sewing plural workpieces under tension112/470.32, Differential feed of plural workpieces112/470.33, Elongated article226/111With means to independently vary mover speed
ExaminersPrimary: Hunter, H. Hampton
Attorney, Agent or Firm
Abstracta sewing machine apparatus for aligning one side of a series of fabric panels in a predetermined position. The apparatus includes measuring devices which associate with and continually monitor the position of one side of the fabric panels with respect to each other. A control means, responsive to the output of the measuring means, selectively advances or retards the top feeding mechanism engaging with the top layer or fabric or the bottom feed mechanism engageable with the bottom layer of fabric, as may be necessary, whereby aligning one side of the fabric panels at the completion of the sewing operation.