GB234261A - Lock stitch sewing machine - Google Patents

Abstract

234,261. Fairweather, W., (Singer Manufacturing Co.). May 3, 1924. Sewing - machines; lockstitching by hooks; governing needle thread.-A take-up of the kind comprising an arm operated by a crank and pivoted to an anchor link is arranged to draw up the needle-loop to the work before the needle begins its down stroke, and to give slack before the needle has descended through a distance equal to the distance between its eye and point. The take-up comprises a bent arm 23, 24 connected to a crank pivot 7 lying outside and slightly to the rear of the pivot 6 of the needle-bar actuating crank. A link 26 connects the arm 23, 24 to the frame. The needle-thread passes through a tension device 29 and under a check-spring 31 before passing through the eye 25 of the take-up. An arm 32 extends below the spring 31 to limit its movement and is adjustable in accordance with the thickness of the work. The take-up is employed in conjunction with a rotary book making three revolutions to one reciprocation of the needle. Specification 233,812 is referred to.