Patent GB-419938-A (GB)
Title: Improvements in or relating to shoe-upper shaping machines
IPC: A43D75/00
Filed: 1933-03-22
Abstract: 419,938. Boot-making machines. UNITED SHOE MACHINERY CORPORATION, 140, Federal Street, Boston, U.S.A.-(Assignees of Pym, C. F. ; Beverly, and Pym, A. F., Swampscott, both in Massachusetts, U.S.A.) March 22, 1933, No. 8609. Convention date, March 24, 1932. [Classes 17 (i) and 89 (iii).] Lasting.-A pulling-over machine has end lasting wipers provided with openings through which a gang of fastenings are driven into shoe upper material wiped on to the shoe bottom by the wipers. One of the openings coincides with the common axis about which the wipers swing, so that a fastening is driven at the centre of the toe end. The fasteners are driven from passages in a guiding device which engages the edge of the insole during pulling over, is retracted to allow overwipe, and is returned to serve as an abutment backing the wipers when these are pressed against the upper margin when overwiping is complete. The guiding device is also moved longitudinally of the shoe to correctly align the passages and openings. The machine stops, as usual, with the grippers holding the upper under tension, and means are provided for reversing the machine, when desired, from this point, for releasing an improperly positioned upper. A last locating plate 50, Fig. 5, is provided with pins 52 arranged in triangular formation to engage sockets in the last as described in Specification 252,252, [Class 17 (i)]. The plate is adjustable longitudinally of the shoe by a hand-wheel 60. The grippers are constructed, closed and guided as described in Specification 400,599. The three forward grippers are given updraw by a lever 240 linked to a plate 256 to which the shafts 122 of the grippers are connected by thrust bearings to allow the rotation described in the prior Specification. The other end of the lever 240 is linked to a sleeve 264 on a rod 266 over which is threaded an updraw spring 268 bearing against the sleeve and a bush 270 threaded into a sleeve pivoted to a cam actuated lever 276. The rod has sliding engagement with a thimble 288 which is rotated to adjust the tension of the updraw spring. The sleeve 264 is connected by a lever 304 and link 302 to a hand lever 298 for the usual hand manipulation of the grippers. The two rear grippers on each side are connected by an equalizing lever to an updraw lever 318 similarly connected to a cam lever 320 and provided with similar adjusting means, except that a separate updraw spring and hand lever is provided for each pair. The rock shafts of the side grippers described in the prior Specification are provided with mechanism for imparting movement lengthwise of the shoe. The rock shafts 394, Fig. 2, of the toe corner grippers are each provided with a collar having a lug 398 engaging a spring plunger 400 urging the lug against a stop for pressing the gripper towards the rear of the shoe. The rock shafts 376, 392 of the rear grippers have arms 404, 406 to impart foredraw to these grippers. The two arms are connected by a rod 408 adjustable lengthwise and also along a slot in the arm 404. The arm 406 is connected by an adjustable link, a spring 444 allowing yield in both directions, with a lever 422 linked to a cam actuated lever 450, a slot in the lever allowing adjustment of the amount of fore draw. A toe support 474, Fig. 4, for taking the thrust of the wipers and fastener inserting mechanism is threaded in a flanged sleeve 478 rotatable by a handle 486 in an arm 480 pivoted at 482. A pin 488 engages a curved slot to allow limited self-adjustment. The toe support is, normally, held raised by a spring 492 on a rod 494 slidable in bearings on a lever 502 also pivoted at 482, the rod having at its forward end a latch 504 co-operating with a plate 506 on the arm 480 to hold the toe-support depressed when it has been swung down by hand. The lever 502 is actuated by a bell-crank lever 512, one arm of which engages a slot 510 in the lever 502 eccentric with the pivot of the bell-crank lever to give a power pressure to the toe pad. The other arm of the bell-crank lever is engaged by a spring 524 threaded over a rod 520 pivoted to a cam actuated arm 526. At the conclusion of the lasting the latch 504 is withdrawn by a lever 536 actuated by a cam lever 550. A cushioning member 560 supported by a spring plunger limits the upward swing of the arm 480. A wiper and toe band carrier 568 is movable lengthwise of the shoe, and also mounted for swing about its rear end for up-wipe by the toe band, and for pressing the wipers firmly against the overwiped upper margin. At its rearward end the carrier is supported by arms 574 pivoted to the carrier and acutated by arms 580, 588 engaging cams. At its forward end the carrier is pivoted by an eccentric portion of a shaft 592, rotatable by a worm for adjustment, to a composite yielding link comprising a block 570 housing a light spring 602 threaded over the reduced end of a rod having a collar forming an abutment for a heavy spring 614 engaging a cam actuated arm 608. A leather toe band 564, Fig. 17, is screwed to a central plunger 626 backed by a spring, and for the remainder of its length is engaged by spring plungers 634, Fig. 18, all the plungers being guided in recesses in a toe band slide 628 and holders 638 which latter are guided by curved ribs 640 to close round the toe as the slide 628 is advanced. The plungers 634 extend over the upper edge of the band, but are not secured to it. The band is closed over the toe by rods pivoted to arms 646, Fig. 16, on a rock shaft 648 actuated by a cam lever 670, yield being provided by a spring 676 and a spring 662, the first being threaded over a link connecting the lever with an arm on the rock-shaft and the second providing a yielding connection between arms 654 on the rock-shaft and extensions 652 of the arms 646. The toe band is actuated by an arm 688 and cam lever 714, a yield being provided by a spring 706 functioning similarly to the spring 662. To prevent damage when the machine is operated with no shoe in position, a spring plunger is provided whereby the members 628, 638 may be locked together. The wipers 566, Fig. 14, are supported under the toe-band slide by a plate 734 formed with a curved recess housing two wiper holders 736 guided by tongues and grooves 738. Along the edges of the wipers are openings 740 through which tacks are driven into the overwiped upper margin, one opening a being provided at the axis about which the wipers swing. The wipers are closed about the toe end by rack bars 742 actuated by sectors 748, Fig. 31, from a cam lever 764, a lost motion connection 758 being provided to allow advance of the wiper carrier toward the shoe. The tack block 774, Fig. 5, extends round the shoe supporting plate 50. Parallel passages therein house drivers 778 carried by a plate 780 secured by a spring plunger 784 to a sleeve 786. The tack block has a stem 792 extending into this sleeve and threaded for an adjusting screw 796, the head of which rests on a rod 794. These parts are secured together by a concentric screw 798 which is removed for change of block. The rod 794 is linked to a lever 802 yieldingly connected to a cam operated lever 806, Fig. 29, the connection including light and heavy springs 816, 818 in a casing arranged so that the springs yield in succession. The tack drivers are actuated by a lever 838, Fig. 5, connected by a yielding coupling to a cam actuated lever 842. After serving as a holder for the edge of the insole the tack block is retracted and moved forwardly of the shoe, then moved upwardly into engagement with the wipers and then rearwardly of the shoe to bring the drivers into alignment with the holes in the wipers, to prevent trapping of the upper margin between the tack block and wipers. The fore and aft components of these movements are produced by a cam lever linked to a sleeve 788 surrounding the sleeve 786 and provided with guide plates 874 sliding in fixed bearings. Just after the points of the tacks enter the upper, the wipers and tack block are moved slightly, rearwardly of the shoe, to straighten the tacks in the driver passages so that the tacks are driven perpendicular to the shoe bottom. To align the openings in the wipers with the driver passages in the tack block, the latter has pins 892 backed by springs which engage triangular recesses 896, Fig. 14, in the wipers. Two tack transferring devices are provided, on opposite sides of the tack block, one for the tacks at the toe end and the other for those at the sides. A transfer block 898, Fig. 25, is detachably secured by a pin 904, provided with flats which release the block on partial rotation, to a slide 900 guided in a casing 902 provided with a cross-bar 916 engaging blocks 920, 922 to limit the movements of the slide. The slide is reciprocated by rack and pinion gearing with yield in both directions. A shutter 954 on the slide retains the tacks while they travel from the tack tubes 912 to the tack block 774 and is urged by a spring towards its open position, the tail of a latch 964 being tripped by the bar 916 on the transfer block reaching the tack block. The shutter is returned by a stop on the casing as the slide is returned, and relatched. To support the thin shutter on the side adjacent to the other transfer block, a slide 978 is held frictionally against movement by a spring 980, and engages the under side of the shutter except when it is pushed aside by the tack block, this slide being returned by a pin on the casing on return of the main slide. The tack supplying mechanism is similar to that described in Specification 7005/00, a pair of tack hoppers oscillated by racks reciprocated through yielding couplings delivering to raceways provided with tack separators and flexible tack tubes connected to the blocks 914. After leaving the separator the tacks are inverted in a member 1072, Fig. 19<a>, provided with a pocket 1078 for each raceway the member being oscillated between limit stops by a gear segm