GB203676A - Trimming mechanisms for sewing machines - Google Patents

Abstract

203,676. Singer Manufacturing Co., (Assignees of Ringe, J. C.). Sept. 8, 1922, [Convention date]. Sewing-machines; trimming and cutting.-Mechanism for trimming the edge of the lowest of a number of plies of material which are being sewn together comprises a trimmer-bar 34, Fig. 5, slidingly pivoted in the machine, head at 37 and oscillated during reciprocation by the interaction of surfaces 42, 43 thereon with a cam-incline 44 and an adjustable screw 47 respectively. The bar is reciprocated by a strut 71, Figs. 1 and 5, on an arm 72 of a shaft 73 which is oscillated from a cam 76 on the needle-shaft 6. An arm 33 on the bar 34 rests on a. rod 32 spring-pressed upwards within the presser. bar 29. A slotted lug 78, Fig. 1, on a hand-lever 79 pivoted at 80 engages a groove 77 on the shaft 73. Actuation of the lever 79 against a spring 83 the shaft 73 endwise to disengage the stud 71 from the trimmer-bar which is immediately forced out of action by the rod 32 to an extent limited by a stud 85 on the trimmer-bar. A bracket 57 is fixed on the bar 34 and carries an adjustable cutter 60 which coacts with a reversible ledger-plate 66 fixed to the throatplate. The throat-plate is recessed at 68, Fig. 5, to provide clearance and is apertured to receive the cutter-guiding finger 62. A slight clearance is provided between the screw 47 and the surface 43 at the time of cutting. Needdes, vibrating laterally; feed by wheels.- The needle-bar 11 is vertically reciprocated in a frame 13 pivoted at 14, Fig. 1 and oscillated from a rock-shaft 17 in time with a continuouslyrotating feed-wheel 25. u