Blind stitch sewing assembly for trouser seams straddles a gap between two plates forming a bulge where it is exposed to pressure from below by a jack

摘要

A blind stitch sewing machine has an has a mechanism (1) which progressively forms a bulge in an advancing feed of material (7) consisting of a number of layers of fabric. The fabric (7) straddles a gap (9) between two plates (8), where it is exposed to pressure from below by a jack (19). The fabric advances in steps, following each of which the jack oscillates from side-to-side in a circular route while simultaneously subject to the action of a sewing needle (11). The bulge-forming mechanism (1) has a capping plate (5) which is held in place by a constant force (F). The force (F) is generated by a pneumatic- or electro-magnetic unit and is adjustable.