GB190166A - Improvements in or relating to hand-embroidering machines - Google Patents

Abstract

190,166. Klaiber, C., and Rohner, E., (Assignees of Eberhardt, H.). Dec. 9, 1921, [Convention date]. Embroidery machines.-In Heilmann embroidery-machines, the thread take-up is decreased after each stitch by mechanism actuated by the movement of the material as it yields when the thread is tautened. Festoon forks 14, and shears 15, mounted on bell-crank levers 16, or other parts engaging the cloth, are normally held vertical by a spring and, when shifted by movement of the material, transmit a slight rotation to axiallymovable spindles 27, 28 through levers 20 and ratchet-and-pawl connections 24, 25. The inner ends of the spindles 27, 28 engage in a fixed sleeve 29 and the members are oppositely threaded so that movement of the material produces uniform intermittent motion of stops 32, 33 towards each other. The stops 32, 33, and also a nut 41 mounted on a screwed spindle 35, loosely engage a rod 34. Chain-wheels 9, 10, alternately, are coupled to a continuously-driven shaft by means of clutches 12, 13 and through the free-wheel gears 39, 38 and 36, respectively and rotate the spindle 35 in opposite directions. The, wheels 9, 10 also drive, through bevel gears 8, the thread take-up mechanism. Arms 42, 45 of levers pivoted at 44 engage respectively in grooved collars 31, fixed to the spindles 27, 28 and in the members 12, 13. The clutches 12, 13 are held open alternately by means of a pivoted angle-part 62, projections 64 on which engage behind pins 65 depending from the lever-arms 45. The part 62 has an arm 61 rocked by a crank 58 on a shaft 57, which is oscillated intermittently from a switch-cam 48 on a continuously-running shaft 47. When the nut 41 strikes the stop 32 it moves the spindle 28 axially, so de-clutching the wheels 9. The wheel 10 is then coupled to the shaft 11 and the spindle 35 oppositely rotated until the nut 41 strikes the stop 32. The take-up mechanisms on opposite sides of the material are thus driven alternately, the takeup decreasing with the travel of the nut 41.