Patent GB-141597-A (GB)
Title: Improvements in and relating to shoe sewing machines
IPC: D05B15/00
Filed: 1918-08-08
Abstract: 141,597. Marks, E. C. R., (Blake, Inc., C.C.). Aug. 8, 1918. Boot-sole sewing-machines ; feeding work by devices to which work is fixed; stitching by locking thread loops with tongues of leather; welting and turnshoe; lasts, mounting.-Relates to machines for sewing together members such as the parts of a shoe, of the type in which loops of'thread are locked by tongues formed in the material of the work, and consists in the construction of the stitch-forming devices and in the means for maintaining them in proper relation to the work irrespective of variations in the thickness and contour thereof. The invention is described as embodied in a machine having means for forming the tongues in the material of the work as described in Specification 133,377. The straight eyed needle 211, Fig. 3, is secured to a slide 214 which works in a carrier 139 pivoted at 140 to an arm 141 extending from a carrier 105, Fig. 8, which has free vertical and angular movements to accommodate itself to the shape of the sole and carries a pair of gauges 152. The carrier 105 is supported by sets of rollers 107 bearing on its periphery and another roller 113. Fig. 5, bearing under a flange, from the vertically movable slide 110, which 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 cam-actuated 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. An adjustable gauge 203 may be provided on the carrier 139 to determine the depth at which the needle enters the sole edge. The needle slide 214 is 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 a 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 the tongues to press them flush with the face of the sole. The needle-thread is drawn from the supply through a tension 224, round a pulley 225 carried by an arm 226 adjustably carried by the needle-actuating bell-crank lever 219, around a fixed pulley 227 and through a tension 228 carried by the lower end of the arm 226 and a slot 229 to the eye of the needle. The Specification also describes weltguiding and work-feeding devices. In order to enable the welt. to be attached edge on to the sole, it is split lengthways and the welt guide 262 is provided with a V-shaped guiding-face adapted to enter the slit. The guide is apertured for the passage of the needle and co-acts 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 are provided to balance the weight of the parts. The work is mounted on a jack 6, Fig. 14, comprising a spindle 2 and toe-rest 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 headed 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 intermittingly 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 guideroller 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 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.