Patent GB-1096553-A (GB)
Title: Heel seat lasting
IPC: A43D13/00
Filed: 1966-07-26
Abstract: 1,096,553. Boots &c. J. S. KAMBORIAN. July 26, 1966 [Aug. 9, 1965], No. 33546/66. Heading A3B. A heel seat lasting machine has a heel clamping pad which is operated by a mechanism arranged so that the forward ends of the pad are initially moved lengthwise of the shoe to stretch the upper and pad about the last and are then moved inwardly to clamp the upper against the last. As described the heel seat lasting machine has a shoe supporting and tensioning unit and a wiper which houses the clamping pad 210, wipers 394, a hold down 314 and a gauge 468. The shoe supporting and tensioning unit is of the type described in Specification 1,040,222 but includes a modified last pin 184 (Fig. 1). The last pin is carried at the upper end of a column which is screwed into the pedestal 42 and can move in a transverse slot. The last pin 184 is also rearwardly inclined so that the last does not ride up the last pin 184 when the upper is pulled forwardly by the upper tensioning unit 44. The wiper head 196 houses a main slide plate 200 (Fig. 29) which carries the heel clamping pad 210 and the wipers 394 and which can be moved from a rearward out of the way position to a forward operative position by a hydraulic piston and cylinder 204. The heel clamping pad 210 (Fig. 26), which may be of rubber and may be inflatable, is carried at its rearward end by a slide 218 and at its forward ends by bars 242. Each bar 242 is pivoted to the piston rod 228 of an air motor 226 and is connected by a link 250 to an arm 230 which is pivoted to the slide 218 at 232. Each arm 230 carries at its outer end a pin 240 which engages a slot 244 in the bar 242. On actuation of the air motors 226 the bars 242 move forwardly, being guided by the pin and slot 240, 244, thus moving the legs 216 of the band forwardly to stretch the band 210 about the last, until the links 250 engage bolts 254 on the arms 230 which causes the bars 242, links 250 and arms 230 to swing about the pivots 234 so that the legs 216 of the band 210 are moved inwardly to clamp the upper against the last. The wipers 394 (Fig. 28) are carried by wiper cams 392 having cam slots 400 which are engaged by rollers 398 on the slide plate 200. The cam plates 392 are connected by links 396 to a slide 370 which in turn is connected to the piston rod of an air motor 388, actuation of the air motor 388 causing the wipers 394 to perform their advancing and closing movements. The wipers 394 carry knurled plates 418 which engage the breastine of the upper to draw it tightly about the last. The hold-down mechanism 312 (Fig. 29) is carried by a slide 316 on the wiper head 196 and can be moved from a rearward out of the way position to a forward operative position by an air motor 330. The hold down foot 314 is carried by a rod 340 mounted in a block 334 which is pivoted to the slide 316 at 333. The block 334 can be rotated about the pivot 333 to raise the hold-down 314 by a toggle 358 which is operated by an air motor 352. To assist in the correct positioning of the upper on the last a gauge 468 (Figs. 1, 36) is mounted on the wiper head 196. The gauge 468 can be swung into its operative position by an air motor (490), a screw 484 on the gauge 468 engaging the insole. When the upper is correctly positioned the edge of the upper should just touch the gauge 468 at opposite sides of the last at points 486. The machine has an automatic control circuit and operates as follows:-on depression of the pedal 602 (Fig. 1) the grippers close and the gauge 468 is lowered to position the upper. On further depression of the pedal 602 the grippers move forwardly to pull the heel end of the upper about the last and the gauge is raised. On still further depression of the pedal 602 the hold-down 314 moves forward to its operative position and the shoe supporting assembly is raised by air motor 16 to clamp the shoe against the hold down 314. The main slide plate 200 then moves forwardly until the heel pad 210 contacts the shoe when the slide plate 200 stops and is locked in position. At the same time the grippers are raised to complete the tensioning of the upper. The heel pad 210 is then operated, the legs 216 of the pad 210 being moved lengthwise of the shoe and then swinging inwardly, the pad 210 being inflated at the same time. The wipers 394 then advance and close and towards the end of this movement the grippers release the upper, hold down 314 is raised and the air motor 16 exerts increased bedding pressure. After a predetermined time lag the various parts then return to their initial positions.