Patent GB-435188-A (GB)
Title: Improvements in or relating to sewing machines
IPC: A47G1/02
Filed: 1934-03-12
Abstract: 435,188. Sewing-machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., Belgrave Road, Leicester.-(United Shoe Machinery Corporation ; 140, Federal Street, Boston, U.S.A.) March 12, 1934, No. 7737. [Class 112] In a curved hooked needle machine of the outsole boot-stitching type, the needle-actuating mechanism includes a rotary shaft 23, a crank 35 on the shaft, a pitman 45 pivoted to the crank 35 and a radius arm 46 pivoted to a fixed pivot and limiting the movement of the pitman, a link 48 connecting the pitman with a pivoted lever having pivoted to it a link 52 operating an oscillating carrier to which the needle is secured. In the form illustrated, the main shaft 22 actuates the stitching shaft 23 by a system of cranks and rods. The shaft 23 has a hand wheel for hand actuation when desired. The shaft 23 carries a crank 35 for connection with the needle-actuating mechanism and cranks 36, 37 for actuating the awl, feed and looper. The shaft 23 also carries a gear 38 for actuating the shuttle, and a cam 39 for effecting a shifting movement of the slide block carrying the needle and needle guide. An eccentric 41 on the shaft 23 actuates the take-up. The positions of the parts shown in the drawings are the final positions which they would occupy on stopping the machine. Needle actuation. The needle is actuated from the crank 35 by a short pitman 45, Fig. 5, a radius arm 46 on a fixed pivot 47. This arm limits the movements of the pitman 45 as the crank 35 revolves. From the pivot connecting the pitman 45 and the arm 46 extends a link 48 pivoted to the rear end of the arm 49 of a rocking lever pivoted on a fixed fulcrum 50 and having a forward arm 51 connected to a link 52. This link oscillates the needle carrier C<1> on the axis 53. The needle guide D on the carrier D<1> is actuated from the crank 35 by levers 48, 49, 51, 55, link 56, block 57 sliding in a curved guide 58 in a fixed bracket 59, link 60, arm 61 and shaft 62. The shaft 62 is connected to arm 63 carrying a roller 64 engaging a curved slot 65 in a lever 66 with an extension 68 connected by a link 69 to the carrier D<1>. The slide block E on which the needle and needle guide are mounted is reciprocated by the cam 39 on the shaft 23 by the following connections, frame 71, arm 72, and slide block extension 73. Awl and feed actuation. The awl F is oscillated from the crank 36 by the pitman 80 and radius arm 81 pivoted at 82 on an adjustable lever 83 pivoted at 84. An adjusting device is provided at 85, Fig. 6. The feed motion of the slide G on which the awl F and its carrier F are mounted is obtained from the same crank 36 through a pitman 92 pivoted at 93<a> to an arm 93. A pair of eccentric discs 94 at the junction of the pitman 92 and arm 93 operate a link 95 to cause the link 95 to move a block which in turn, by suitable connections, operates the feed slide G. Looper actuation. The looper H, Fig. 8, is mounted on a carrier H<1> with a circular hub H<2> turning freely on an eccentric 125 mounted on a spindle 126. The eccentric is oscillated by a flange 128 connected to the crank 37 by suitable linkage. Take-up. The take-up J consists of a thin rotary disc carrying a grooved thread wheel J<1> co-operating with a pair of thread guides 164, 165. The take-up disc is rotated at predetermined but variable speeds by connection to an eccentric 41 on the main shaft 22, Fig. 3.