Patent GB-460228-A (GB)
Title: Improvements in or relating to shoe upper conforming machines
IPC: A43D21/12
Filed: 1935-07-24
Abstract: 460,228. Shoe - making machines. UNITED SHOE MACHINERY CORPORATION. July 24, 1935, No. 20982. Convention date, July 28, 1934. [Classes 17 (i) and 89 (iii)] Lasting and pulling-over; nailing.-Relates to machines of the kind described in Specification 419,938 and consists in detail improvements. The fore part of the shoe is supported in a predetermined position both heightwise and laterally of the machine by a plate, the margin of which abuts against the inside of the insole lip. An end gauge acts as a stop or abutment for the toe-end of the last, depression of a treadle releasing the fore-part -supporting plate to the action of springs which urge it forward. The same treadle causes a heel support to move up to the shoe, this support being, later, forced, by power, more firmly against the shoe and locked against retraction. Modified grippers are described, which open wide and close quickly, both jaws moving towards and from each other while closing and opening, respectively. Provision is made for the correct positioning of the tip seam. The side grippers are arranged to receive the margin of the upper with the ends of the tip seam presented in a definite relation to their jaws, a definito foredraw is then imparted to these grippers and the intermediate portion of the seam positioned by a pull at the toe end. A tip gauge is then moved into contact with the upper so that the position of the seam may be checked, and, if necessary, rectified by manual movements of the grippers. Prior to the actuation of the wipers a shoe holder clamps the forepart of the upper firmly against the last, the toe gripper then imparting a further pull to assist the heightwise wiping of the wipers. The side grippers, after their release of the upper, are swung inwardly, widthwise of the shoe, to avoid interference with the tacking means. Means for feeding binder wire to a groove in the inner edges of the wipers is mounted on one of the wiper carriers, and the binder is secured to the shoe by fasteners inserted by mechanisms mounted on the wiper carriers to move relatively to the wipers to positions determined by stop faces on the wipers. A fore-part support 2, Fig. 6, is secured by dowel-pins to a slide 10 adjustable longitudinally of the shoe by a thumb nut 22 with respect to a slide 24 urged rearwardly by springs 28 but normally held forwardly by a latch 34 connected by links 40, 52 and 60, Fig. 3, with a treadle 62, depression of which frees the slide which is moved rearwardly by its springs until the toe of the last abuts against a stop 4, Fig. 6. Later, this stop is removed to out-of-the-way position by a cam. Depression of the treadle also advances a heel support 96, which is slid rearwardly by a rack 104, Fig. 3, actuated by a pinion 100 gearing with a sector 106 linked to a lever 114 actuated by a rod 122 resiliently connected to a bar 132 moved longitudinally by an arm 136 actuated by the treadle. A pawl 152 holds the mechanism in operative position. To ensure against displacement of the shoe during the toelasting operation, the heel support is given a positive thrust during the power operation of the machine by a cam-operated lover 182 pivoted to the bar 132 and carrying a pair of pawls 158 which at this time are in engagement with rack teeth on the yoke member of. the bar 122. To assist in positioning the shoe, a pivoted arm 78 carries at its free end a horizontal bar spring pressed upwardly to a limit such that the too end of the shoe properly seats on the toe-plate. The slide 24, Fig. 6, carries a second latch 68 for holding it in operative position against the thrust of the wipers, the tip of the latch co-operating with a notch in a bar 72. A bell-crank lever 1354 frees the latch prior to the end of the machine's cycle. Each of the grippers comprises a casing 234, Fig. 13, guiding a jaw 236 movable axially of the casing and a jaw 238 pivoted to the casing and provided with a roll engaging cam surfaces on the shank of the other jaw. The first jaw is urged upwardly by a spring 254 threaded over a rod carrying a pin 260 engaging a slot in the slide to which the jaw is secured, the rod projecting from a slide 250 formed at its lower end with a spiral track engaging a similar track on a member 278 rotated as described in the prior Specifications to open and close the grippers. The slide 250 is positively depressed on reverse rotation of the member 278 by an axial rod carried by this member and provided with a pin engaging a spiral slot in the upper member. The three grippers at the end of the shoe are operated to pull the upper heightwise of the last by a lever 350, Fig. 6, connected by links 362, Fig. 63, to a sleeve 364 slidable on an enlarged portion of a rod 373, the sleeve and enlarged portion being engaged by a washer urged upwardly by a spring 374 threaded over the rod and confined by a nut on the rod. A cam-actuated lever 380 moves the rod 372 longitudinally to exert a pull on the upper through the spring, the strength of the spring being adjusted by turning a cap 398 in which the rod can slide but not rotate. The position of the nut member 378 and, therefore the setting of the spring strength, is indicated by a pointer 402. For adjusting the tip seam manually, if necessary, the forked arm 410 of a lever is connected to the links 362 and to a rotatably supported member 422, Fig. 3, normally disconnected from a hand lever 428 so that the power pull of the grippers will not swing the hand lever with possible danger to the operator. A hand grip 436 controls a plunger which can connect the member 422 with the handle, and when these are connected the toe grippers may be moved manually to adjust the tip seam. A lug on the casing of each of the side grippers actuates a bellcrank lever to swing the grippers inwardly under the shoe to out-of-the-way position as they are pulled downwardly after they have released the upper. Fore-draw is imparted by mechanism similar to that described in the prior Specification, but to all the grippers instead of only those at the side of the shoe. To adjust the amount of fore-draw a screwed rod 672, Fig. 3, serves as a stop to a bell-crank lever 674 pivoted to an arm which moves as the gripper rock-shafts swing to produce foredraw in the manner described in the prior Specification. The rod 672 is rotated by a handle 706, Fig. 39, and to indicate the position of its end, and, therefore the amount of foredraw given, teeth are formed on its upper end gearing with a pinion 712 which drives an indicator 708 provided with numbers and graduations visible through an opening in a cover plate provided with an arm. When the toe wipers begin to move inwardly over the insole the lever 674 is swung to allow a short further fore-draw. Near the end of the pulling-over operation, a tip-seam gauge is carried into engagement with the shoe, so that the position of the seam may be adjusted, if necessary. The gauge comprises a graduated plate 720, Fig. 43, adjustably clamped to a slide 726 formed with teeth gearing with a pinion actuated by a segment 748 moved by a spring 752 on release of a latch 754 provided with a tail 766 co-operating with a finger 764 carried by the wiper carrier. The gauge is returned by a plate 800 carried by an arm 776 on which the fore-part pad described in the prior Specification is mounted, the plate engaging a member 802 on the gear sector as the pad is moved to operative position. The wipers 844, Fig. 16, are detachably secured in slots in wiper carriers 846 by spring-pressed pins having heads 852. The pins engage holes in the wipers, and can be entered only when spring-pressed plungers in the slots have been pushed inwardly by the edges of the wipers. The wipers are closed by bars 882 slidable in blocks 890 swivelled to a camactuated cross-bar 892, springs 896 allowing yield to the wiper carriers. The forward end of the wiper carrier is supported by a rod 914, Fig. 49, threaded into a member engaging an eccentric portion of a pin 918 supported by lugs on the wiper head, the lower end of the rod extending through a pin 920 carried by a cam-actuated lever 922. Surrounding the rod is a heavy spring 926 and a light spring 934, the first abutting against a nut 928 on the rod and a member 930 engaging a flange on the rod, and the second against a ring 936 threaded on the nut and a cylindrical member 938 mounted on the pin 920. The pin 918 carries a worm wheel rotatable by a worm having a head 948 for adjusting the eccentric. The construction provides a light pressure through the spring 934 while the wipers are wiping over the feather of the insole, and a heavy pressure through the spring 926 at the end of the inward movement of the wipers. The left-hand wiper carrier supports means for feeding binder wire into a groove in the wipers, situated near the top face of the wipers and in their wiping edges. The wire w, Fig. 21 is drawn from a reel and over a guide wheel 997 to feed wheels provided with thin peripheral flanges entering the groove and driven by gear wheels 1012. The pressure of the feed wheels on the wire is adjusted by a screw 1014 at the end of a lever carrying the feed wheel 994 at its other end. These wheels are driven by a rod 1018, Fig. 16, having a slidable connection with a sleeve 1022 driven by a rod 1026 passing through a bearing pivoted to the wiper carrier and driven through a second telescopic connection by bevel gearing 1048, Fig. 29, driven by a worm wheel 1076 on the shaft of the electric motor driving the machine. Normally, the drive to the gears 1048 is interrupted by a clutch having a spring 1088 controlled by a lever 1086 adjustably linked to a lever 1096 actuated by a cam 1102 adjustable by slots 1103 on a cam shaft 810. By adjusting the length of the link 1092 by a nut 1094 the length of wire fed to the wipers can be regulated. A brake stops the feed when the clutch is released. A shear member 982, Fig. 21, is automatically reciproca