Patent GB-112267-A (GB)
Title: Improvements in or relating to Fastener-inserting Machines for use in the Manufacture of Boots or Shoes.
IPC: A43D69/04
Filed: 1917-12-17
Abstract: 112,267. United Shoe Machinery Co., (Assignees of Mackenzie, F. L., and Goddu, G.). Dec. 18, 1916, [Convention date]. Slugging; welts, attaching.-A string-nailing machine for use in the manufacture of boots and shoes comprises cutting means which shear the point of the second nail in the string across and against the head of the first nail. The machine comprises a main frame 8 pivotally supporting a swinging head 4 in which are mounted the operative parts of the nail-inserting and awl mechanisms. The nail driver 42, Figs. 1 and 3, is clamped in a bar 30, which is raised by cam-operated means from a main shaft 12 and forcibly driven downwards by a spring 36, and slides through a guide 44 integral with a plate 46 screwed to the head 4 so that it operates through a passage in a nail throat 60. The awl 52 is carried by a bar 50, which is reciprocated through rack and segmental gearing 54, 56 from a rock-shaft 57 actuated from a cam block on the shaft 12. The machine is described as equipped with two nail strings w, which are coiled around reels 70, 72, Figs. 1 and 16, carried on a shaft 76 journaled in a bracket 78 fixed to the head 8, the ends of the wires being led through tubular guides 82, which are adjustably supported in blocks pivoted to the outer ends of levers 86, to grooves in a common guide 74. Each lever 86 is pivoted on a pin 88 passing through a post 90 adjustably carried in an extension 92 of the bracket 78, and the rear arm 96 of each lever carries a brake shoe 98 adapted to be forced yieldingly against the periphery of the corresponding reel by a spring 100; the tension of the spring is adjusted so that the pull on the wire during feed is just sufficient to release the brake. Each nail passage in the guide 74 is partly covered by a spring 110, Fig. 3, the lower end of which serves as a pawl to engage with the heads of the nails to prevent them from being dragged up wards upon the upward movement of the nai feeder. The guide 74 has an integral plate 11 screwed to an arm 122 last on a rock shaft 124, which is operated through an arm 128, Fig. 1@ from a cam block 10 so as to swing the guide into and out of the line of drive. In order to shift the guide to change from one nail string to the other the shaft 124 is provided with rack teeth gearing with a segment secured to one end of a rock shaft 136, the other end of which carries a shifter 138 formed with arms 140, 142 adapted to be engaged by a plunger 144. This plunger is adjustably secured in a sleeve 146 which is connected to the awl-bar operating-lever 58; the sleeve carries, in an off-set clamp arm 150, a stud 152 which passes loosely through a block pivoted on one arm of a shift lever 156. When this lever is moved, the plunger 144 is swung into line with one or other of the arms 140, 142 so that, upon the next down stroke of the awl, the plunger engages that arm and moves the guide 74 in one or the other direction. Afterwards, the plunger recipro. cates idly until a change of nail string is desired, when the shift lever 156 is moved in the opposite direction to swing the plunger so that it engages the other arm 140, 142 on the next descent of the awl following such movement. The nail string is advanced by a feeder 180, Figs. 1 and 3, adjustably secured to an arm 184 pivoted to a rocker arm 188, which has an adjustable connexion 192 with a cam-operated lever 194. A spring 206 tends to force the feeder towards the guide 74, while a roll 202 on the feed arm travels over a guide surface 200 on the plate 118. After the nail string has been advanced, the end nail in the nail throat is severed by a cutter 230, Figs. 3 and 7, which is adjustably clamped in the guide 74. This cutter operates on the return stroke of the guide so that the nail is severed by moving the point of the second nail across the head of the nail in the throat; during this movement the feeder 180 is forced backwards, its controlling- cam being shaped to give it a slight lift so that it will yield freely. To control the nails as they pass through the nail passage in the throat 60, the latter is provided with a spring-pressed finger 212, Figs. 3 and 8, which has a blade end 222 projecting through a slot in the throat to force the shank of the nail against the back wall 216 of the nail passage; a slight swell 226 formed on the blade engages the head of the nail tq press the upper part of the nail against the wall 216. The work is clamped between a horn 240, Fig. 9, and a fixed abutment 242, the horn being, in the usual way, spring-pressed upwards and dropped intermittently during feed. The lower end of the horn is received in a split eccentric sleeve 264 adjustably disposed and secured by a screw 246 in a yoke 244, which is rotatably mounted on a shaft 248 between a fixed collar 254 and an adjustable cap nut 250. The eccentric sleeve 264 provides means for accurately centring tha horn and at the same time setting it to compensate in any position of rotation of the horn for the springing tendency of the horn tip. To limit the turning movement of the horn, particularly when the machine is used for welt nailing, its lower end carries a threaded stud 266 adapted to engage either end 268, 270 of a yoke 272 adjustably held by a screw 274 on a cross pin 276 passing through arms 278, 280 of a bracket clamped to a projection 282 on the machine column 2 ; the yoke may be swung into inoperative position, as shown in dotted lines, when unrestricted movement of the horn is desired. To adapt the machine for nailing-on welts it is provided with a multiple welt holder 290, Figs. 1, 14, and 15, comprising three spiders 302. 304, 306 adjustably secured on a rod 308, the end spider 306 being clamped to a bracket 336 projecting from the machine head; a pin 316 6 prevents any relative rotation of the spiders about the rod 308, or any lateral twisting. The rod 308 carries. rolls 320, 322 to facilitate unwinding of the welting, which also passes over grooved guide rolls such as 324. To provide for an accurate relative adjustment of the head 8 and the horn, the head and the machine column 2 carry respectively plates 340, 342, Figs. 11 and 12, which are slotted at 344 to receive clamping-bolts 346 and are provided with a pair of opposed adjustable locking- devices. Each device comprises a shouldered bolt 348 having a key 350 adapted to enter a keyway 352 in a hole 354 in the lower plate, the hole being just large enough to receive the reduced and threaded end 356 of the bolt, which is fitted with a nut 349. The bolt passes through an adjusting collar 358 having an eccentric portion 360 which is received in an oblique slot 362 in the plate 340. When the collar is turned, its eccentric portion bears against the walls of the slot and causes the plate 340 and head 8 to turn relatively to the column 2, the parts being secured after adjustment by the nuts 349 and bolts 346. Specification 115,243 is referred to.