GB242788A - Improvements in and relating to sewing machines - Google Patents

Abstract

242,788. Imrie, H., (Reece Button Hole Machine Co.). Nov. 13, 1924. Sewing-machines; loopstitching.-In a machine in which a needle operating above the work co-operates with two loopers 14, 15 and two spreaders 16, 17 below the work, the loopers, which are independently pivoted, are given the usual irregular movement through cam-means from an actuating-member 34 having an harmonic movement The looper arm 18 is pivoted at 19 to the turret 6 of a button-hole sewing machine and is held by a spring 39 in engagement with an actuating-lever 35, which is formed with a cam-surface 40 in engagement with a pin 41 on the member 34. The looper arm 20, pivoted at 21 on the turret, has a tail 42 formed with a cam 43 and held by a spring 46 in engagement with a pin 44 on an arm 45 adjustably fixed to the member 34. The member 34 is fixed to a sleeve 33 vertically reciprocated from an eccentric on the main-shaft. Spreaders 16, 17 pivoted on the looper-arms 18, 20 are actuated in the usual manner by the bevelled arms 27 of a bell-crank pivoted at 26 in the turret and actuated through a link 47 from a rod 49 which is reciprocated from a cam on the main-shaft. To adjust the timing of the loopers the member 34 can be adjusted on the sleeve 33. In a modification, the cam 40 of the lever 35 is formed on a member 59, Fig. 7, adjustably pivoted to the lever. Specification 10156/93 is referred to.