Method of forming a folded hem and system for guiding a multiple

Details Method of forming a folded hem and system for guiding a multiple Method of forming a folded hem and system for guiding a multiple

1997-12-02

1999-05-04

Nerbun, Peter

Sewing

Method of sewing

Material sensing

112 63, 112306, 112143, 11247506, 226 17, D05B 3504, D05B 3510

Patent

active

058991590

ABSTRACT:
A guiding system for use with translucent textile work pieces is disclosed. A free edge (52) of a tubular work piece extends along a continuous processing path and is folded under the work piece to form a hem in the work piece. The work piece is then advanced along the processing path toward a downstream sewing machine (11), whereupon the hem is sewn in the work piece. A lower ply sensing opposed beam sensor (76) upstream of the sewing machine detects a multiple ply leading edge of the folded hem, and is moved by a pneumatic cylinder (88) into a position laterally with respect to the processing path where it will detect the free edge of the folded and sewn hem, and will control a lower work piece guide assembly (34) so as to maintain a proper depth of the hem. This enables the sewing needles (20) of the sewing machine to align the two spaced parallel lines of stitching (68) at the beginning and end of the hem line for minimizing waste in such hem forming operations.

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