Patent GB-133377-A (GB)
IPC: A43D43/02
Abstract: 133,377. Marks, E. C. R., (Blake, Inc., C. C.). Aug. 8, 1918. Boot - sole sewing - machines; feed by devices to which work is fixed; stitching by locking thread loops with tongues of leather; welting and turn. shoe; lasts, mounting.-Relates to sewing-machines for securing together the com. ponent parts of articles such as shoes, of the kind in which the needle - thread loops are locked by tongues formed in the body of the material, and consists in the provision of means for ensuring the formation of the tongues of uniform width and thickness throughout their length. The means described comprise gauges which determine the extent of action of the tongue-forming tools and their position relative to the work. The Specification also describes a construction of the stitch-forming, work-holding, feeding and welt-guiding devices. The tongue-forming devices consist of a knife 94, Fig. 19, designed to make a furcular slash on the surface of the in-sole, and an awl 95, Fig. 21, which enters the edge of the in-sole at right-angles to the line of action of the knife 94, and severs the material between the tines 97 from the body of the material to form the tongue. A depth gauge 101 is placed between the forks of the knife to determine the depth of the. cut. The knife slides on a carrier 105, Figs. 6 and 8, which also carries an arm 141 to which is pivoted at 140, Fig. 3, the carrier 139 in which is mounted the awl 95 and stitch-forming devices. The carrier 105 is supported, by sets of rollers 107 bearing on its periphery and another roller bearing under a flange, from a slide 110 so that it has free vertical and lateral angular movements to accommodate itself to the shape of the surface of the sole, and is provided with a pair of gauges or feet 152 having rounded bottoms to engage the sole. An adjustable gauge 203 may be provided on the carrier 139 to determine the depth at which the awl and needle operate on the sole edge, The slide 110 is given an impulse during each cycle to ensure its free movement by a pawl 155, Fig. 8, engaging a rack 154 and carried by an arm of a bell-crank lever resiliently connected as shown to a camactuated swinging lever 162. The pawl is stripped from the rack at the end of each operation by a fixed abutment 160. The carrier 105 is locked in its adjusted positions by a spring-controlled sliding pawl 172 engaging a rack on the periphery of the carrier. The pawl carries a roller 175 which is actuated during each cycle to free the carrier, by a sliding cam 184 actuated by the lever 162 through sliding connexions 188, 185. The knife 94 is actuated by a lever 118 resiliently connected to a swinging arm 121 having a ratchet connexion with a cam-actuated lever 129. The pawl 127 is disengaged from the ratchet 136 during each cycle by a cam-actuated lever 196 to allow free movement of the carrier 105 in adjusting itself to the thickness and surface of the sole. The awl 95 is secured to a slide 137 actuated by a pivoted block 146 and slotted cam-actuated lever 148. The threaded needle 211 reciprocates in the same plane as the awl and in a direction inclined thereto so as to emerge from under the tongue of material in the sole, and is secured to a slide 214 actuated by a pivoted block 217 and slotted cam-actuated lever 219. The looper 212 has a shank which is mounted in a bearing in the bracket 206 on the carrier 139, and is acted on by a spring tending to move it upwards. The shank is connected by a universal coupling with a shaft 236, which is rocked by a reciprocating rack 242 and a pinion 240 splined on the shaft, and is reciprocated by the controlling-spring and a continuouslyvibrating cam-actuated lever 255, 254 with a pawl 249 adapted to engage a rack 248 formed on one side of the shaft. The looper thus derives movements for placing the loops of needle-thread over the tongues and then wiping over them to press them flush with the surface of the sole. In machines used for attaching a welt to the upper and insole, a welt guide 262 is provided with a, V- shaped guiding-face adapted to enter a longitudinal cut formed in the edge of the welt. The guide is apertured for the passage of the needle and coacts with upper and lower presser members. The guide is carried by a bar 267 sliding on the carrier and held up to the work by a spring 268. Springs 141<a>, 201 are provided to balance the weight of the parts. The work is mounted on a jack 6, Fig. 14, comprising a spindle 2 and toerest 3 which is normally under the influence of a spring 12 and can be jacked up by means of a worm 15 and rack 13. The toe-rest is adjustable to suit different dimensions of the work. A pattern plate 27, Fig. 16, is clamped to the jack by means of beaded studs 30 and a plate spring 32 adapted to be bowed by a cam 33. The flanged edge 28 of the pattern plate is provided with holes which are engaged by a pin-wheel 37 intermittently rotated to feed the work by the bevel-gears 43, horizontal shaft 40, Fig. 1, bevel-gears 44, and vertical shaft 45 which is driven from the cam shaft by the worm 47 and pin-wheel 46. The worm 47 consists of a straight central groove with the ends oppositely curved. A guide-roller 69 engages the inside of the flange of the pattern plate, and two guide-rollers 70, 71 carried by a spring- controlled frame 85 bear on the outside of the flange. The roller 69 is depressed and the rollers 70, 71 moved sideways to permit removal of the work, by a slide 77 with suitable cam-slots engaging rollers 75, 93. The slide is actuated by a lever 80 which has a lost-motion connexion with a lever for lifting the slide 110 carrying the cutting and stitch-forming devices.