GB206374A - Stop motion mechanism - Google Patents

Abstract

206,374. Fairweather, W., (Singer Manufacturing Co.). Nov. 21, 1922. Sewing - machines; starting and stopping gear.-In stop mechanism for machines for sewing on buttons, barring, tacking &c. a positive stop is associated with a brake. which is applied at the inception of the stopping action and released at its completion. The apparatus is described as applied to a machine of known type for attaching buttons and compris. ing a stop-lever 16 carrying a belt-shifter 18 and a, spring plunger (not shown in Fig. 3) which engages a positive stopping-cam 20 on the main shaft, this lever being also mounted so as to have a limited sidewise or shock-absorbing movement after engaging the cam. The lever 16 is held out of operative position by a catch 22 released at the close of a stitching operation by a lug 23 on the cam-wheel 12. At starting the lever 16 is moved out of alignment with the cam 20 and into re-engagement with the catch by the manual operation of a bell-crank lever 27, 28 connected to a spring-pressed rod 26. The brake 32 is mounted on a spring-controlled lever 33. A lever 39 is mounted so that one end may be engaged by the lever 16 in its sidewise motion, the other end engaging a stud on a sliding bar 41, a cam-lug 42 on which engages a cam-lug 43 on the brake lever 33. The bar 41 has a projection 44 engageable by a spring pressed latchlever 45 carrying a trip 48 held yieldingly at right-angles to, the lever 45 by a spring 49. On starting the machine by moving the lever 16, the brake being then inoperative, the slide 41 is latched in its right hand position in Fig. 5 and the trip 48 is in position to be moved by the initial stopping movement of the lever 16 to release the lever 45 from the bar 41 and free the brake from detention by the lug 42. The catch 22 being tripped to release the lever 16 and the) brake lever 33, the stopping cam comes into contact with the lever 16 and moves it sidewise against the action of a plunger b. This motion of the lever 16 acting through the lever 39 effects the resetting of the slide 41 and puts the brake out of action the catch 45 being allowed to engage the stop 44 owing to release of the trip 48 from the lever 16. The sidewise movement of the lever also effects the final thread-cutting movement of a thread-cutter by its action on a bell-crank lever 57, 59, engaging a stud 56 on an operating-slide 50.