Patent GB-1040222-A (GB)
Title: Heel seat lasting
IPC: A43D21/12
Filed: 1965-02-25
Abstract: 1,040,222. Lasting machines. J. S. KAMBORIAN. Feb. 25, 1965 [March 20, 1964], No. 8168/65. Heading A3B. In a heel seat lasting machine having a shoe support for supporting bottom up a shoe assembly, a toe rest, grippers and wipers, the grippers are positioned forwardly of the heel region and move first forwardly and then upwardly to stretch the upper about the last before the wipers are operated. As described the machine also includes a heel clamping pad and a hold down unit. The last support (Fig. 1) comprises a last pin 224 and a last supporting plate mounted on a screw threaded sleeve in a column 208 to enable the heightwise position of the last pin to be adjusted. The column 208 is mounted on a platform 68 which can be moved heightwise by a pneumatic piston and cylinder 20 and can be rotated about the axis of the cylinder 20 to adjust the angular position of the last with respect to the wiping head, the platform being locked in this adjusted position by a brake ring (not shown) operated by piston and cylinder 60. The last pin houses a plunger which can be raised by a piston and cylinder to eject the last at the completion of the lasting operation. A slide 74, having a frame 90 which houses the toe rest and grippers, can be moved lengthwise in the platform 68 by a reversible motor 82 through a gear train and a rod which is screwed into the slide 74. The machine has two sets of grippers, each of which is mounted in a housing 186, is opened and closed by a piston and cylinder 206 and are mounted at either end of a cross bar 174 (Fig. 12 not shown). The cross bar 174 is mounted on a carriage 96 which has rollers 98 which run in the frame 90, and which can be moved lengthwise to tension the upper by a piston and cylinder 100. The cross bar 174 is carried by a slide which moves in a guide 126 on the carriage and can be moved heightwise to tension the upper by a piston and cylinder 146. The guide 126 can itself slide heightwise in the carriage 96 to adjust the initial position of the grippers and is moved by a handle 114, sprockets 116, 120 and chain 118 and a threaded sleeve 111. The toe rest 170 is carried by a slide 150 which can move heightwise in the frame 90 and whose height can be adjusted in unison with the grippers by a prong 160 on the guide 126 which can slide in an aperture in the slide 150. The heightwise position of the toe rest 170 can also be adjusted independently of the grippers by a screw threaded sleeve 166. The heel clamping pad 348 (Fig. 25 not shown) and wiping mechanism are carried on a main slide plate 260 which is movable between a rearward remote position and a forward working position. The slide plate 260 is moved by a piston and cylinder 268 (Figs. 1 and 26 not shown) mounted between a bracket 275 on the machine frame and a lug 264 on the slide plate 260. The lug 264 also carries two tangs 284, 286 (Fig. 26 not shown) which slide between struts 272, 280, 274 on the bracket 275. Operation of a piston and cylinder 308 causes a cam surface on a lever 302 to jam the tangs 284, 286 and struts 272, 280, 274 together to lock the slide plate in position. The heel pad 348 (Fig. 25 not shown) consists of an inflatable U-shaped pad which is carried by levers 318 which are pivoted to a beam 328 which is slidably mounted on the slide plate 260. The engagement of the heel pad with the shoe when the slide plate is being moved forward causes the beam 328 to move rearwardly with respect to the slide plate and causes a valve actuator 338 on a bar 336, attached to the beam 328, to actuate a valve 340 which operates the cylinder 308 to lock the slide plate in position. The pad 348 is then closed about the heel end of the last by a pair of piston and cylinders 312, the pad 348 being inflated at the same time. The wipers 388 are mounted on wiper cams 386 mounted on a slide plate 356 which slides along guides 358 on the main slide plate 260. The wipers 388 are moved forwardly by a piston and cylinder 360 via a connector 366 and the wipers are closed by a piston and cylinder 396 via a connector 402, a drive bar 382 and links 384, these two movements being performed independently, one after the other. The wipers 388 have prongs on the underside of their forward regions which clear the shoe upper when the wipers move forwardly but which engage the upper when the wipers close inwardly to drag the upper and stretch it tightly about the last in the region of the breast line. The hold down unit 448 is mounted on a slide 450 (Fig. 38 not shown) in the machine frame and can be moved from a rearward remote position to a forward working position by a piston and cylinder 454. The hold down foot 470 is carried by an arm 464, pivoted to the slide 450 at 466 and is held at the correct level by the high portion 488 of a cam 486 which is interposed between a roller 478 on the arm 464 and a roller 462 on the slide 450. The hold-down foot 470 is raised by moving the low portion 490 of the cam 486 between the rollers 462, 478 by means of a piston and cylinder 480. The machine has a pneumatic contrrol circuit and operates as follows:- With the shoe support, toe rest 170 and grippers in their lowered position and the heel pad, wipers and hold down in their rearward remote position the operator places a shoe assembly bottom up on the last pin 224 and places the margins of the upper in the grippers. On depression of a treadle 498 the grippers close and on further deprression the grippers move forwardly to stretch the upper about the last. On further depression of the treadle 498 the hold down 470 is moved to its forward working position and the piston and cylinder 20 is actuated to raise the shoe support, toe rest and grippers to clamp the shoe assembly between the shoe support and the hold down. The clamping pad 348 and wipers 388 are then moved forwardly until the clamping pad 348 engages the heel end of the shoe which causes the main slide plate 260 to be locked in position as described above. The grippers are then raised to stretch the upper against the last and the clamping pad 348 is then inflated and closed around the heel end of the last. The wipers 388 are then moved forwardly to cause the portion of the wipers adjacent their vertex 392 to wipe the upper, and the wipers are then swung inwardly, the prongs on the wipers engaging the upper in the region of the breastline as described above. At the same time as the inward movement of the wipers the grippers are opened and at or near the end of the inward movement of the wipers the hold down is raised and the piston and cylinder 20 exerts an increased upwards force to provide bedding pressure between the insole and the wipers. After a predetermined time the various parts return to their initial positions after which the plunger in the last pin is raised to eject the last.