Patent GB-495437-A (GB)
Title: Improvements in or relating to heel-seat fitting machines
IPC: A43D8/34
Filed: 1937-05-11
Abstract: 495,437. Heel-seat fitting-machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation) May 11, 1937, No. 13349. [Class 17 (i)] In a machine for trimming the heel-seat portion of a sole to leave a tab suitable for reception within a cupped attaching face of a heel, the length and width of the attaching face of the heel are measured and the machine automatically adjusted to vary the length and width of the tab correspondingly. The margin of the heel-seat portion of a sole is forced by a U-shaped clamp against plates comprising a pair of opposing front crease plates and a pair of opposing back crease plates, the back plates having sole-supporting faces inclined to the front plates so that the rear end of the sole is bent upwardly. The sole reducing knives comprise a pair, each arched transversely of its path of movement. On each side of the longitudinal median line of the sole is a unit comprising a front crease plate, a back crease plate and a guide way for a heel seat reducing knife. This unit moves angularly about the meeting point of the two back crease plates, to adjust the width of the tab. On each side are, also, sole clamping units, each comprising a front and a back presser member angularly movable with the first mentioned units, the back presser members being adjustable longitudinally of the shoe with the corresponding crease plates. Filler plates are provided at the gap between front and back presser members. The crease plates comprise a pair of forward plates 42, Fig. 5, each formed with a rib 116 engaging a groove 114 in an extension of a back presser plate 44, the two extensions being bolted to arcuate plates 104 formed with ribs depending from their edges engaging arcuate grooves in a carrier slide 108, Fig. 6. Knife carriers 78, Fig. 5, guided by grooves 84, carry curved knives each having a cutting edge at its forward edge, and one a cutting edge 62 to connect the incisions made by the front edges. A notch 89 opposite the edge 62 prevents fouling. The curved knives, in their movement, pass along the edges of both front and rear crease plates. The margin of the sole at the heel end is clamped down on the crease plates by right and left presser units 52, Fig. 4, each comprising a front presser foot 208, Fig. 11, a rear presser foot 172, and one or more presser plates 210 if a gap is present between front and rear pressers. Each back plate 44 has a vertical shank 138 carrying a trunnion 142, the two trunnions being connected by a right-and-left hand screw 148, Fig. 13, held against axial movement by spaced collars 156 engaged by arms carried by a slide 152, Fig. 11, carrying an adjustable abutment 162 intended to be brought into contact with the rear edge of the heel. Each of the shanks 138 has a vertical guide way receiving the corresponding back presser member 172, which member is formed with vertical slots for receiving depending flanges 176 of suspension blocks 178 having arcuate top flanges 182, Fig. 13, and opposing recesses to receive a pin 188 secured to the slide 152. This pin is in line with the meeting edges of the plates 44 and forms the pivot about which the units on each side of the sole are adjusted. Front presser members 190 are recessed to receive the flanges 176, and are pivotally connected by pins 194, Fig. 11, to slides 196, Fig. 10, which carry the gauges 222 for the sides of the heel. Springs 202, Fig. 11, urge the members 172 downwardly to a limit determined by a pin 204. The slide 108 is advanced, to bring the abutment 162 into contact with the heel, by a handle 226, Fig. 1, carrying a sector gearing with rack teeth on the slide and provided with a pawl 230 for retaining the slide in forward position. The shoe positioning means comprises a bifurcated gauge 232, Fig. 16, for centring the rear end of the shoe and a back gauge 234. The side gauge members are urged forwardly by spring plungers 246, and the heel end gauge by a spring plunger 258. The latter gauge has a rear extension carrying a bar 242 engaging the rear of the slide 108 and carrying a finger 244, Fig. 7, co-operating with an indicator 264 to show that the shoe has been pushed well back into position. The knife slides carry cam rolls 272, engaging arcuate grooves in cam-operated slides 276 to ensure that angular adjustment of the slides does not vary their extreme forward position. Rolls 130 moving with the crease plates 42 engage cam-ways secured to the frame to maintain the corners 124 of the plates in a fixed line 122. To ensure that the shouldering knives 126, Figs. 4 and 6, also reach this line at the end of their stroke, their starting position is adjusted by pins 312 carried by the plates 42 engaging grooves in members secured to slides 300 carrying the shouldering knives and their operating mechanism, the latter comprising a bell-crank lever 322 for each knife formed with a sector 320 gearing with rack teeth on a slide 316 guided in the slide 300. Secured to the slide 316 is a block formed with a slot 330 co-operating with a roll 332 secured to a knife carrying slide 334 engaging a T-shaped guide 336. The path of movement of the knife 126 may be varied by adjusting this bar, the inner end of which engages a groove 352 and the outer end is clamped in adjusted position along the arcuate outer edge of the slide 300. In operation, a heel is positioned with its breast against a bar 166, and the handle 226 is depressed until the abutment 162 contacts with the heel. The slide 108 moves with the abutment, carrying with it the back plates 44 and the rear clamping units 172. The screw 148 is then rotated by its handwheel 155 until the side abutments 222 first centralize and then both contact with the heel, this movement adjusting the plates 42, 44, clamping units and guide-ways 84 angularly. The shoe is then positioned, and pushed rearwardly until the back gauge reaches its stop, proper positioning being indicated by the finger 244. A treadle is then depressed rocking a lever 386 to lower the heel holder in its slide 98. The clamps 42, 44 thus descend on the sole margin and as many of the plates 210 as the corner of the flange 176 engages. The treadle is then depressed further, to connect a cam-shaft to a one revolution clutch, a groove 286, Fig. 1, actuating the trimming knives and a groove 370 the shoulder forming knives 126. On release of the treadle the heel rises, the sole is released and the work can be removed from the machine. In a modification, the handle 226 is arranged to advance the abutments for the sides of the heel as well as that for the rear of the heel, this being provided with a wedging-ball look to prevent undue pressure being exerted.