Patent GB-283978-A (GB)
Title: Improvements in or relating to lasting machines for boots or shoes
IPC: A43D21/02
Filed: 1926-07-15
Abstract: 283,978. British United Shoe Machinery Co., Ltd., (United Shoe Machinery Corporation). July 15, 1926. Lasting and pulling over. - A step-by-step gripper lasting machine which is adapted to fasten the lasted upper without the fasteners penetrating to the foot-engaging face of the sole or insole and which has an actuating cam or crank rotating on an axis extending on the machine head in a direction from side to side of the operator has the following provisions; gripperoperating means causing the gripper to approach the insole face, then to move upwardly and outwardly to clear the insole rib, and then to move downwardly and outwardly to ensure a proper grip of the upper materials; means causing the gripper to move outwardly during updraw to bring the upper materials clear of the insole feather and means causing the gripper to move downwardly towards the insole face during overdraw; a two-part or compound spring-connected updraw lever to prevent excessive tension on the upper; a longitudinally movable push rod pivotal with the updraw lever for closing the gripper jaws; separate controlling means for the gripper and fastening mechanisms so that the gripper may remain idle while fastenings are inserted; an anvil member adapted to clamp the upper materials and rib against an overlaying and fastening member and to yield to accommodate varying thickness of work; and a driver operated by a spring adapted to be loaded by forward movement of the overlaying and fastening member and to be released when such movement is completed. As shown, for example in a machine of the general type described in Specifications 228,578 or 236,566, the machine includes a base 30, Fig. 1, and hollow column 32 on which is adjustable a head 34. A cam shaft 42, Fig. 4, extending from side to side of the head carries a stapling cam-wheel 44 and a gripper cam-wheel 46 respectively fast and loose on the shaft. A driving gear 48 is adapted to be clutched to the shaft 42 by a cone-clutch 50 and is driven by shafts 54, 58, gear 62, Fig. 1, shaft 64 and motor 72. The clutch 50 is operated by a clutch drum 76, Fig. 4, and wedge 84 operated by adjustable levers 90, 92. The lever 92 carries an adjustable brake shoe 102 adapted to engage a flange 104 on the drum 76. A spring normally holds the lever 92 in a position to open the clutch and apply the brake shoe, the lever being moved to start the machine by a treadle 120, rod 126, rock shaft 130 and link 136. The clutch cannot reopen until the cycle of operations is completed. When the treadle 120 is depressed, the cam-wheel 44 only is operative and stapling alone is performed. To render the gripper also operative, the cam-wheel 46 is clutched to the shaft 42 by a treadle 160, Fig. 1, rod 186, rockshaft 130, link 178, Fig. 4, and pin-clutch 162, 170. The gripper, Fig. 2, comprises jaws 198, 200. The inner jaw 198 is secured on a holder 202 pivoted at 208 to the front end of an overdraw lever 210. The upper end of the holder 202 is gripped in a holder 214 pivoted on an updraw lever 218 mounted on a rock shaft 220. The lever 218 and a lever 224 are pivoted together at 222 so as normally to work together as a unit. The lever 224 is operated by a roll and a track in the cam-wheel 46. To provide relative movement against yielding resistance between the levers 218, 224 when the force of the updraw exceeds a predetermined amount, a rod 232 is pivoted at 230 to the lever 224. An updraw spring 240 is arranged on the rod 232 between an adjustable washer 242 and a nut 246. The latter is readilv adjustable by the operator to vary the tension of the spring 240. For quick adjustment, the washer 242 is moved by a lever 248, link 254, and hand-lever 260. The jaw 200, Fig. 2, is operated by a rod 270 slidable in the holder 202 and also by a cam member as set out in Specification 228,578. The rod 270 is operated against a spring 308 by a rocker 286 and a rod 288 slidable through the rock shaft 220 and operated yieldingly by a rod 296, lever 292 roll 304 and cam-wheel 46. The overdraw rod 210 is operated by a lever 318, Fig. 2, roll 324, and cam-wheel 46, the overdraw movement being performed by a torsion spring. The gripper is so controlled by the updraw and overdraw levers that before it grips the upper it approaches the insole to below the level of the insole rib, and then follows the path indicated at a, Fig. 19, to ensure proper reception of the upper materials between the jaws. During the updraw the gripper is moved outwardly from the shoe edge to reduce friction against the insole feather, Fig. 20, and then the overdraw occurs in timed relation to the operation of the overlaying and fastening mechanisms. During pulling over the shoe is positioned by a rib-engaging anvil 340. The overlaying and fastening mechanism. Figs. 2 and 10, includes means for forming staples above the line of drive and for transferring them to alignment with the driver. These mechanisms are mounted on a slide 348 movable in an inclined guideway 346 in the head 34. The slide is moved by a roll 350 and cam wheel 44. Secured to the guideway 346 is a plate having a finger 352, Fig. 13, to serve as an inside staple former, and a wire guide 354. Wire is fed over a block 358, which serves as an overlaying member, to a stop 356, is cut off by a cutter 366, and is shaped by outside formers 362 as the slide 348 moves forwardly. A finger 370 on the slide 348 holds the staple cross bar firmly on the former 352 and a plate 372 which, when the slide 348 has advanced, is in alignment with the inside former, serves for the transfer of the staple to driving position. The formers 362 are operated by a rod 364, Fig. 10, link 376, lever 374, roll 378 and cam-wheel 44 acting through a spring. The movement of the formers 362 is limited by stops 384, 386. The driver 388, Fig. 14, is carried by a slide 390, Fig. 10, in a guideway on the slide 348. The end of the driver advances along a ledge 394 which receives and supports the transferred staple and is aligned with guide slots 396 in a cap 398 on the block 358. The driver is operated by an arm 400 and a tension spring, not shown, the tension of which is adjustable by an apertured member 412 and a pin. To retract the driver against the spring, the arm 400 is held back as the slide 348 advances by a latch 428 pivoted to a lever 424 which is pivoted at 422 to the machine head. The latch is released to allow the spring to operate the driver by a screw 436 and tongue 438 when the slide 348 has advanced fully and when, further, the lever 424 is rocked by a roll 442 and a track on the cam-wheel 44. The staple legs are held straight during driving by a pawl 445 held in the driving nozzle by a spring plunger 446. The staple is clinched by depressions 447 in the anvil 340 which turn the legs outwardly. The anvil 340 is carried by a holder 448, Fig. 10, so that its lower end is offset laterally so that the staple is driven through a portion of the upper directly in the line of the pulling strain. The holder 448 is carried by a laterally adjustable sleeve and the anvil is held up to the work by a spring 458 allowing yielding for varying thickness of work. The anvil is adjusted by a screw 460 and arm 462. A wire feed is provided similar to that described in Specification 228,578 and is illustrated in Fig. 3, not shown. In operation, both the treadles 120 and 160 are depressed and the shoe is held with its rib engaging the anvil 340. The shoe is lasted, the gripper moving in each cycle through the path described. At the end of the gripper movement the overlaying member 358 tucks the upper into the rib of the insole and a staple is driven. For stapling alone, for example at the rear end of the rib adjacent the heel seat, the treadle 120 only is depressed and the gripper remains idle.