GB222721A - Overedge sewing machine - Google Patents

Abstract

222,721. Fairweather, W., (Singer Manufacturing Co.). Dec. 11, 1923. Sewing-machines; loop-stitching; needles, driving; needle guides. - In an overedge sewing- machine in which the thread carried by an eyepointed work-penetrating needle 14, Fig. 1, is enchained at the margin of the work by a bearded needle 15 in conjunction with loop spreaders 37, 20 above and below the work, the spacing of the needles and the throw of the loop spreaders can be adjusted to a number of predetermined positions for substantially differing widths of seam. The needle-bar 16 carries a cam block 11, which coacts with a crank 8 on the main-shaft 6 to reciprocate the needle-bar, and a needle-holder 151 which carries the needles 14, 15, the latter of which is clamped in any one of a series of apertures in the holder. The loop-spreader 20 is carried by member 26 pivoted at 24 and oscillated by a link 28 adjustably connected to a lever 30, which is actuated from a cam 35 on the mainshaft 6. The loop spreader 37, Figs. 1 and 2, is adjustably clamped to a bell-crank 40, 58 pivoted on the free end of the arm 44 of a bell-crank 44, 47 which is adjustably connected by a link 48 to an arm 51 of a shaft 53 which is rocked from a cam 57 on the main-shaft. The bell-crank 40, 58 is linked to an arm 60 of a second shaft 61 rocked from a cam 64 on the main-shaft. While the needles are at the upper end of their stroke and the work is being fed, the spreader 37 is drawing a thread-loop to present to the needle 15. When the needles descend, and the spreader 37 completes its movement, the needle 15 descends between the arm of the upper loop a as shown in Fig. 6 carrying a loop b from under the work. The loop b slips past the beard 15<1> which is then closed between a back-guide 72, Fig. 2, mounted on the cloth plate 2 and a beard-closing block 74 mounted on an edge-guide 77. As the needles rise, the spreader 20 seizes a fresh loop b, thrown by the needle 14 and presents it to the beard of the needle 15, which seizes it as shown in Fig. 9 and is then closed to pass through the work and the two loops on its shank. The lateral stress produced by the drawing of the lower loop b is taken by a stitch-retaining finger 69, Fig. 2, having a bevelled edge slightly spaced from the bevelled edge 68 of the needle-hole 67 so that the loops will feed readily on to the work-plate. Work supporters and guides.-A circular throat plate 65 having a substantially rectangular needlehole 67 is secured in an opening in the cloth plate. An edge-guide 77 is adjustably secured upon the cloth-plate by screws 78 and a slot 79.