Improvements in the manufacture of spading feet for sewing machines with double needle, intended for the production of spiral wire closures (Machine-translation by Google Translate, not legally binding)

摘要

Improvements in the manufacture of stitching feet for double-needle sewing machines for the production of spiral wire fasteners, in which two interlocking spiral wires provided with longitudinal and winding threads on their outer sides are sewn with two fastening tapes using guide cords that cover the longitudinal threads, characterized in that the stitching foot consisting of a lower plate (1) and an upper plate (2) has a guide (8) on the intake side between the two plates, in which the two fastening tapes (B1, B2), crossing in plane, slide along with the inner edges in the finished closure of the two tapes and are immediately driven straight and parallel through a guide space (1a) corresponding to the thickness and the total width of the closure between the two plates, because the lower plate behind the cross guide is provided with two perforations (7) for the passage of the needle; because the upper plate from the front edge to the passage (18) of the needles is provided with a cut or incision (19) corresponding to the width of the two interlocking spiral wires and which enter in the longitudinal direction and in whose area in front of the needles there are two guides (23,24) for the entrance of the two guide cords (C) that cover the longitudinal and wound threads (a) of the spiral wires, and because the passage (18) of the needle is joined by the lower face of the upper plate a groove (20) extended rearward, the width and height of which correspond to the width and height of the two spiral wires with the stitched guide cords. (Machine-translation by Google Translate, not legally binding)