Patent GB-339935-A (GB)
Title: Improvements in or relating to heel attaching by machines
IPC: A43D79/00
Filed: 1929-07-16
Abstract: 339,935. British United Shoe Machin ery Co., Ltd., Gouldbourn, J., and Elliott, H. E., (United Shoe Machinery Corporation). July 16, 1929. Heels, machines for.-An inside heel attaching machine is provided with means for clamping the heel at a plurality of points near the heel seat, these clamping means being so inter-connected that they accommo.- date themselves automatically to the shape of a particular heel,with a driver assembly so arranged that inclined nails can be driven very near the edge of the heel, and, in a modification, with a driver assembly such that selected ones of a series of drivers may readily be rendered operative to suit varying nail designs. As shown applied to a machine of the kind described in Specification 23031/11, a jack 1 comprises a shoe-entering member 8 and guides a driver plunger 2. Inclined driver bars 5, 6, 7, Fig. 7, are connected to a head 3 on the plunger by means of inclined, undercut, recesses 4. The driver bar 5 carries two short drivers which are offset from the bar by means of plates 12, so that the drivers can operate, very close to the edge of the jack. The jack carries an adjustable gauge 14. Preferably, the drivers are hollowed out at their ends for use with round-headed nails, which may be threaded as described in Specifications 134,883 and 158,657, [both in Class 83 iv), Metals, Working]. The heel clamping means comprise a tread-engaging member 16, rear and side clamps 17, 18, and a breast clamp 19. The tread clamp comprises a plate 20 angularly adjustable on a block 21, Fig. 3, longitudinally adjustable in a slideway 22 on a screw 23 vertically adjustable in a rod 25 slidable in a plunger 26 of the machine. The rod 25 is moved, for vertical adjustment of the plate 20, by a wheel 27. The rear clamp 17 comprises a pad 28 freely slidable in guideways on a block 30 pivoted to a slide 32 adjustable along a longitudinal guideway on a shaft 34 slidable in a housing 29 on the lower end of the plunger 26. A spring 36 just raises the shaft 34 and rear clamp. A compensating lever 40 rests, with the interposition of part - spherical washers 42, 41, on the rod 25 and shaft 34. Each side clamp, Fig. 2, comprises a pad 43 pivoted by a link 45 to a curved bar 46 movable in a curved guideway in the housing 29 and held upwardly by a spring 49. Each bar 46 has a rack 50 operated by a gear and pinion 51, 53 and a toothed segment 54 on the end of lever 55. The inner ends of the levers 55 have ball ends 57 which engage in a bore in the lever 40. The breast clamp 19, Fig. 1, is carried by a screw 60 adjustably pivoted to a frame 63 which is pivoted to an arm 67 pivoted at 68 to the machine frame. A spring 69 tends to swing the clamp away from the heel. A bar 73 pivoted to the arm 67 and surrounded by a spring 74 has a slotted upper end in which engages a pin 71 on the plunger 26. The upper end of the frame 63 carries a spring plunger 77 engaging a cam surface 80 on the plunger 26. In operation, the tread clamp 16 is adjusted to engage the heel first when the plunger 26 is lowered. The rear and breast clamps are then moved in to engage the heel. After this, the lever 40 is stationary, so the levers 55 are rocked to move in the side clamps 18. Continued movement of the plunger 26 then presses the breast clamp firmly against the heel through the cam surface 80 and plunger 77. In a modified form of machine, described as applied to a machine of the kind described in Specification 100,111, the heel clamping devices are carried on a reciprocable head 102, Fig. 12. The jack comprises a base 110, a front bar 118, a top 122, and a curved shield 124. The driver assembly includes a plunger 126 and drivers 128 arranged in sets for use with different nailing designs. A spindle 140, Fig. 15, with different eccentric portions 138 is arranged below each set of drivers. Rotation of the spindles to a position fixed by a spring plunger 148 causes a particular driver of each set to project further from the jack top and so be operative. A rear nail is driven very close to the edge of the jask by arranging a short driver 162 to be operated by a link 168, slide 172, and striking screw 176 in the plunger 126. A clamp carrier 184 longitudinally adjustable in the head 102 carries, by means of a vertical slide 186, a transversely-adjustable slide 190 on which rear and side clamps are carried by a slide 196. Bell-crank levers 200 pivoted to the slide 190 carry adjustably on their outer ends side clamping pads 208. Their inner ends 210 are rounded and engage in depressions in a vertical slide 212 in the slide 196, Fig. 16. The slide 212 is urged downwardly by a spring 214 and carries, by a universal pivot 217, a rear clamp 216. The slide 196 is held rearwardly, away from the. heel of a jacked shoe, by a spring 220, and carries a roll 224 engaging a pivoted lever 222 which has a roll 226 engaging an adjustable cam surface 228 on the machine frame. When the head 102 descends, the lever 222 moves the slide 196, with its clamps, in to heelengaging position. The rear clamp 216 first engages the heel, and the levers 200 are then swung to press the side clamps against the hoot The breast clamp 234 is adjustably carried by a lever 232' which has at its rear end a toothed segment engaging rack-teeth 238 on the slide 186. This holds the breast clamp normally raised, but turns it into breast-engaging position when the rear and side clamps have engaged the heel. The breast clamp is locked in clamping position. by a ratchet segment 248 and pawl 250.