Patent GB-107475-A (GB)
Title: Improvements in or relating to Shoe Welt Sewing Machines.
Inventor: MELLERSH-JACKSON WILLIAM JOHN
IPC: D05B15/00
Filed: 1916-08-31
Abstract: 107,475. Jackson, W. J. Mellersh-, (Re@cee Shoe Machinery Co.). Aug. 31, 1916. Boot-sole sewing machines; welting and turnshoc ; chain-stitching.-In shoe-welt sewing-machines, all the operating instruments are actuated bv a link-and-lever mechanism. The invention is described as applied to a machine for stitching the welt to the shoe upper and preferably also the insole. The main shaft 53, Figs. 2 and 7, is mounted in a standard 51 and two vertical walls 52 and has two cranks 56, 57, the crank 56 being 'timed 60 degrees behind the other. The crank 56 drives a crank-rod 61 which is controlled by a swinging lever 81 and is connected by a link 62 with an arm 75 secured to a rock-shaft 76. The crank 57 drives a crank-rod 63 which is controlled by a swinging-lever 71 and is connected by a link 72 with a lever 73 pivoted on the shaft 76 and having integral arms 87, 74. The needle c is driven directly by the lever 73 through a curved link. The looper D is carried by a threaded shank d and is actuated, by reciprocating the nut d<1> by the link-connexion 86 with a. swinging lever 83 which is actuated from the lever 81 by the link 82. The thread hook E carried by the pivoted shank e is actuated bv link-connexion 90 with the junction of the link 89, pivoted to the link 81, and the link 88 pivoted to the arm 87 of the lever 73. The channel guide B, Figs. 7 and 14, is carried by a shank b pivoted on the shaft 101 and provided with a spring-controlled sliding connexion with slide 79 driven by a link 78 from an arm 77 on the rock-shaft 76. The feed-point passes through an aperture in the channel guide and is carried bv the shank g pivoted alongside the channel-guide shank on the shaft 101. The work-engaging movements of the point are derived from the arm 87 which is connected by the link 93 to a bell-crank 94, which is in turn connected to the feed-point shank by the link 95 having a spring- controlled sliding connexion with the shank. The feed-point and channel-guide shanks are secured between collars on the shalt 101 and obtain their lateral feeding movements from the endlong movements of the shaft derived from the arm 96, Fig. 21, on the shaft 76, link 97, slide 98, link 99, and bell-crank 100. The welt-guide H is carried by a slide h and is adapted to be moved into operative position by a spring and withdrawn by the link connexion 110 with a lever 108 pivoted at 109 to the frame. The lever 108 is operated by contact of an adjustable screw carried by the lever 107 pivoted on the same fulcrum and actuated through a link 106. bell-crank 105, link 104, crank-rod 65 driven from the crank 57, and link 103 pivoted to the lever 73. The work-support A is carried by a slide a and is kept up to the work by a spring a<3>. The work-support and welt-guide are locked when the needle is in the work by a dog A<1> pivoted to the frame, forced into action by a spring and disengaged by a roller on the end of the arm 74 engaging an incline on the tail of the shank a<1>. The take-up F, Figs. 2 and 18, is carried by a pivoted lever f operated from the crank 57 by the rod 64 controlled by the swinging lever 91 pivotally mounted on the shaft 76 and connected by a link 92 to the take-up lever. Associated with the take-up is an auxiliary take-up F<1> carried by a swinging arm f<1> mounted on the same pivot as the lever f, and having a, rearward extension 113 connected by a link 114 to a swing- ing arm 115 for the purpose of keeping the thread taut. When the main take-up acts to set the stitch, the tension of the thread lifts the auxiliary take-up, pressing the lever 115 rearwardly against a spring-pressed buffer 117 until it comes into contact with the frame whereby the stop of the auxiliary take-up is cushioned. Adjustments are provided for the various working parts wherenecessary.