GB196388A - Interlocks for sewing machines - Google Patents

Abstract

196,388. Fairweather, W., (Singer Manufacturing Co.). Jan. 24, 1922. Starting and stopping gear.- Power-operated sewing machines are provided with starting and stopping means having interlocking devices whereby starting is prevented while a work-clamp, presser-foot, &c. is displaced from sewing position and accidental displacement of such part is prevented when the machine is running. In the application to a label-cutting and sewing machine, a presserbar 6 co-operates with a clampfoot 12 and a feed-slide 53. The main shaft carries fast and loose pulleys 17, 18 associated with a belt-shipper 22 mounted on a stop-lever 19 manually operated by a lever 28 against the pressure of a spring 27 to throw the belt on the fast pulley. The stop-lever is held in driving position by a spring latch 25, which is released to effect the stoppage of the machine by a lug 26 on the pattern-wheel 15. A stop-arm 33, pivoted at 31, carries in a lateral extension a stop-screw 35, which lies in the path of the lever 19. The arm 33 is connected by a link 38 to one arm 40 of a three-armed lever, another arm 43 of which is connected by a link 44 to a lever 45, 48 engaging the presser-bar 6. A spring 51 tends to hold the lever 45, 48 in the position corresponding to the stitching position of the presser-bar. The lever may be moved to lift the presser-bar when the machine is not running by a chain 50, by which the toggle 38, 40 is straightened, the stop screw 35 being consequently moved to prevent the inward motion of the stop-lever 19 to start the machine. When the machine is running, the lever 19 is locked in position to prevent the movement of the arm 33 and the lifting of the presserbar. The feed-slide 53 is controlled through connection with the third arm 52 of the lever.