GB185710A - Driving and controlling mechanism for power-operated machines - Google Patents

Abstract

185,710. Fairweather, W., (Singer Manufacturing Co.). June 17, 1921. Clutches, friction; gearing for stopping and starting machinery.-In order to facilitate the use of high-speed electric motors for driving sewing and other small machines the mechanism for declutching the motor from the machine is arranged to cut in resistances into the motor circuit so that the motor runs at reduced speed during the idle period of the machine. A motor C is secured by housing 11, 12 on an outwardly projecting bearing-boss 10 of the main shaft 9. The shaft 16 of the motor carries a worm 17 meshing with a gear wheel 18 secured on a clutch. disc 19 turning freely on the shaft 9. A hand-. wheel 20 fast on the shaft 9 is clutched to the disc 19 by a ring 21 carrying pins 22 which slide in holes in the wheel 20 and are engaged by a pusher 24 to force the ring into contact with a loose ring 23 of compressed cork, &c. which frictionally engages the disc 19. The pusher is actuated by the engagement therewith of an adjustable stud 36 of anti-friction material, such as oil-soaked hard wood, mounted in a lever 34, pivoted on the frame and also carrying a brake shoe 39. The lever 34 is connected by a link 42 to a lever 44 on a shaft 45 rotatable against the action of a spring by a tread rod 48. Connected to the treadle rod by a chain 57 is a rheostat arm 53 held by a spring 55, when the machine is at rest, on the uppermost of three contacts 54 so as to include in the motor circuit resistances r<11>, r<1>. When the treadle rod is depressed to start the machine the resistances are successively cut out, and immediately after the arm 53 meets the lowest contact the clutch is engaged.