GB220882A - Looper actuating mechanism for sewing machines - Google Patents

Abstract

220,882. Fairweather, W., (Singer Manufacturing Co.). Jan. 9, 1924. Chain-stitching and double-loop stitching.-A sewing-machine looper-carrier 31 is given endwise and sidewise movements from an adjustable eccentric 14 and from a rotary inclined crank 41 respectively so as to permit of variation in the relative timing of the eccentric and the crank. A sleeve 24 loosely mounted on a rod 25 carries a bracket 28 on which is fixed the looper-carrier 31. A spherical-headed pin 20 is secured in a slotted arm 23 of the sleeve 24 and pivots in a pitman 16. A yoke on the pitman is pivotally connected by a bolt 19 to a split. strap 15 of an eccentric 14. A sleeve 51 journaled for oscillatory movement on the sleeve 24 is held from axial movement thereon between the arm 23 and a split. nut 52 clamped upon the threaded end of the sleeve 24 by a band 53. An arm of the, sleeve 51 is universally jointed to an arm 44 of the crank 41, which has a circumferential rib 43 to prevent axial movement of the split crank-arm sleeve 45, 48. The eccentric 14 carries a flange 33 which contains a spring-closed oil passage 34 communicating by a number ot passages 37, 38 with the bearing surface. The bolt 19 is hollow and contains radial passages for passing oil to its bearing surface.