GB200536A - Improvements in and relating to sewing machines - Google Patents

Abstract

200,536. Baker, F. Jan. 17, 1922. Stitches; sewing-machines; loop stitching.-A single thread locked loop-stitch, Fig. 7, is formed by drawing out a subsidiary loop B, Fig. 2, from one arm of the loop A formed by the needle, passing the loop B through the loop C, Fig. 3, projecting from the last stitch, twisting the main loop A and passing it over and tightening it upon the root of the loop B. The loop B then lies ready for engagement in the next stitch. The stitch can be made by means of an adaptation of a rotary lock-stitch shuttle mechanism and the mechanism readily re,converted for lock-stitching. In one form of mechanism shown in Fig. 3, the last loop C is penetrated by a curved looper 1 actuated by a rack-bar and one limb a<1> of the needle-loop is bent round the notched end of the looper by a part 14. The looper is then withdrawn and carries a subsidiary loop formed in the needle-thread loop through the loop C. The main needle-thread loop A is then carried round by the part 6, which is an adapted rotary shuttle with its spool case, and slips over the back of the looper 1 on to the root of the subsidiary loop.