Patent GB-118288-A (GB)
Title: Improvements in or relating to Machines for Working Uppers Over Lasts.
IPC: A43D21/16
Filed: 1918-08-14
Abstract: 118,288. United Shoe Machinery Corporation, (Assignees of Pym, C. F.). Aug. 15, 1917, [Convention date]. Lasting. - In a pulling-over and lasting machine, an arm 18, Fig. 2, corresponding to the usual front tacker arm of a pulling-over machine pivotally supports at 20 a plate 22 carrying a block 26, Figs. 2, 5, and 6, which is formed with guideways 28 to receive segments 30 geared through pinions 32 to racks 36. The segments support wipers 42 which are notched at 62 to engage positioning-pins 60 on the segments and are detachably held in place by headed pins 44; the heads of these pins have a sliding engagement with the grooved heads of larger pins 52, which serve as a means for withdrawing the pins 44 and are held in place by spring plungers 58 engaging one or other of recesses 56. The wipers 42 are pivoted together at 64 and carry pivot pins 68 for spaced side plates 66, between which and the wipers are arranged pivoted binder-applying plates 70; headed screws 76 pass through slots in the plates 66, 70, which are normally held open by springs 82. The binder is in the form of a bent piece of wire a having inturned ends which are located inside the inner edges of the plates 66, the rear end of the binder being supported on a spring-pressed member 88 mounted in the block 26 and adapted to yield backwards on contact with the shoe. The lasting-mechanism is carried rearwards towards the shoe by a rearward swinging movement of the arm 18, which is slotted at 114, Fig. 2, to receive projections from a slide 94 mounted in a. holder 96 supported on a shaft 98; the slide is formed with a rack 102 to engage a pinion 100 on the shaft 98, which receives a rocking movement from a cam 12 on the main cam-shaft 6. The closing of the wipers is effected through members 116 which are pivoted at 118 to a frame member 120 and are forked to engage rounded extensions 40, Fig. 5, of the racks 36; these extensions are surrounded by adjustable springs 122. As the arm 18 swings inwards, the members 116 are stopped by the engagement of adjustable stops 130, Fig. 2, with lugs 132 on a casting 134 secured to the frame member 120; and when this takes place, the springs 122 also arrest the racks 36 so that, on the continued movement of the arm 18, the pinions 32 and segments 30 are rotated to cause the wipers 42 to close inwards over the shoe margin and the plates 66 to close against the shoe. The plat.e 22, Fig. 2, has an extension 142 carrying a bolt 144, which projects through an opening in a lug 146 on the arm 18 and is surrounded by an adjustable spring 148. This spring tends to swing the wiper carrier in a direction to depress the wipers relatively to the shoe to an extent limited by an adjustable nut 154 on a second bolt 152, which projects from the extension 142 through the lug 146 and carries stop nuts 156. The nut 154 provides means for adjusting the normal angular relation of the wipers to the shoe bottom, the wipers being preferably inclined toward the plane of the shoe bottom from the toe end rearwardly, while the spring 148 enables the wipers, when closing, to yield to compensate for differences in the thickness of the upper materials. In order to cause the toe gripper to release the upper as late as possible, the usual trip mechanism 158 is connected by a rod 160 to a lever 162 on the gripper, the lever being positioned to be engaged by a member 164 adjustably carried on the side of the arm 18; this member is angularly arranged so as to cause the gripper to be tripped sooner or later according to tne position it occupies after the pulling-over operation. Springs 166 connected to the gripper and to bars 168 pivoted on the casting 134, tend to move the gripper forwards to an amount limited by the engagement of cam lugs 170 on the gripper casing with rolls 172 on fixed brackets 174; the lugs are shaped to permit the usual forward movement of the gripper during the updraw, and the springs 166, while serving to operate the gripper yieldingly to draft the upper forwardly on the last, yield to avoid breakage should the wipers accidentally engage the gripper. The bars 168 are connected by a cross bar 176, which carries an adjustable stop screw 178 held by the springs 166 in engagement with the arm 18. As the later swings rearwards the tension of the springs is relaxed, and the toe gripper, under the influence of its updraw spring, yields backwards in a direction to carry the upper towards lasting position. To secure the binder, the driver plates 70, Fig. 5, are operated by drivers 180 extending from the hubs of pinions 182 in gear with pinions 184 on shafts 186, which are mounted in brackets 188 secured to the wipercarrier. The shafts 186 carry arms 190 arranged to be operated through a rod 196, Fig. 2, from the slide 94, which, for this purpose, has imparted to it a downwardly swinging movement caused by the carrier 96 being swung about the shaft 98 by the action of a cam on the shaft 6 on a roll carried by an arm 194 projecting from the carrier; the slots .114 in the arm 18 permit this downward movement of the slide. The connexions between each arm 190 and the slide 94 include a clutch roll and yielding members so arranged that the operative connexion between the arm and slide is broken after the binder ends are driven into the work and a predetermined resistance to the inward movement of the driver plates is reached. After the wipers have closed over the shoe margin they receive a positive downward movement to press the upper materials firmly down upon the sole margin and into the angle between the rib and feather. For this purpose, the arm 18 is mounted on an eccentric portion 228 of a rock shaft 230, to which is adjustably secured a lever 232 carrying a trunnion block slidable on a rod 234, which is connected to the slide 94 at the same point as the rod 196; a spring is arranged between the trunnion block and a nut on the end of the rod 234 to hold the block normally in engagement with a stop 246 on the rod. When the slide 94 is swung downwards the shaft 230 is rocked to force the arm 18 in a lengthwise downward direction just before the binder is driven. By reason of the angular relation of the slots 114 to the slide 94, the arm 18 at this time is also pulled slightly backwards and a further pressure of the wipers against the stock in the direction of the rib is effected; as this takes place while the binder is driven, the effect is to bend the inturned ends of the binder forwards towards the toe of the shoe. To clamp the shoe, and to support it against the downward pressure of the wipers, each of the usual side clamp arms 16, Fig. 2, carries members 248 for engaging the upper at the sides of the shoe, and a pair of universally supported members 254, one to engage the shoe near the toe and the other farther back upon the upper; the members 254 which engage the upper near the toe on either side of the shoe are movable into positions substantially contiguous to each other. The machine is provided with a last-positioning member 264, Fig. 9, to determine the location of the toe end of the last when the work is presented to the machine, and with a hold-down 268, both devices being curved to embrace the toe, and both being mounted on a pivot 266 on the usual sole rest 10. The member 264 is formed on opposite sides with curved slots 288, the front portions of which extend upwards at an angle to the shoe bottom, and the hold-down 268 with straight slots 290 substantially parallel to the shoe bottom, both sets of slots being engaged by a pin 284 which extends on opposite sides of a rod 270 into cam slots 286 formed in upward projections 287 of the sole rest 10. The rod 270, Fig. 2, is mounted for endlong movement against the action of a spring 282 in a pivoted block 272, which has secured to it cam-plates 276 provided with camslots 278 engaged by rolls 280 on the arm 18. The arrangement is such that first the member 264 and afterwards the hold-down 268 are swung upwards and rearwards as the wipers advance, the member 264 wiping over the inner surface of the upper which is held by the toe gripper so that it tends to smooth out any wrinkles that there may be in the tensioned upper. Specifications 633/01, 9793/08, 11222/08, 114,433, 128,573, and 131,376 are referred to.