GB250835A - Improvements in or relating to electrical driving arrangements for sewing and other machines - Google Patents

Abstract

250,835. Fairweather, W., (Singer Manufacturing Co.). Oct. 8, 1925. Actuated or applied by driving-mechanism disengagers; acting on flat sides of discs and the like. - In an electrical motor drive, more especially for sewing- machines, one end of the induction motor shaft 5, Fig. 1, is supported by rotary and thrust bearings 10, 24, and the other runs in an axially-movable sleeve shaft 12 which is journaled in a bushing 11 in the motor end-plate 9<1>. The sleeve 12 carries the driven clutch member 13 co-operating with the driving member 7 formed on a flywheel 6 rigid on the motor shaft. The member 13 also has a braking surface 15 which, as shown in Fig. 3, co-operates with a stationary brake block 16 secured in the end-plate 9' by screws 18, 19 which allow adjustment for wear. The outer end of the sleeve shaft 12 carries the driving-pulley 20 and is covered by a stud 22 forced into the pulley hub. A spring 23 bears on this stud and, through the reaction of the thrust-bearing 24, normally keeps the clutch members disengaged and the brake surface 15 in engagement with the brake. An operating lever pivoted at 28 on the end-plate 9<1> has one arm 27 for attachment to a treadle, an arm 25 for pushing in the sleeve shaft to engage the clutch member 13 with the rotating flywheel, and a third arm 26, covered with leather to bear against the pulley and assist the spring 23 when the clutch is to be disengaged.