Patent GB-1346313-A (GB)
Title: Heel lasting machine
IPC: D03J5/16
Filed: 1971-05-14
Abstract: 1346313 Boots &c. J S KAMBORIAN 14 May 1971 [28 May 1970] 14965/71 Headings B2L and L26H1 In a heel seat lasting machine having symmetrically disposed heel wipers, the line of symmetry of the heel end of the last is brought into coincidence with the line of symmetry of the wipers, by placing the last on a last pin 150, swinging the last until it contacts sensing member 80 or 82 (depending on whether the shoe is for a left or right foot) at which stage the line of symmetry of the last is parallel to, but offset from, the line of symmetry of the wipers (owing to the fact that the last thimble hole is offset from the centre line of the last) and finally shifting the last pin 150 sideways to bring the two lines of symmetry into coincidence. As described the machine also includes a toe rest 110, a heel band, and a hold-down and adhesive applying assembly 235. The last supporting assembly Fig. 3 is mounted on a platform 26 which can be raised and lowered by a piston-rod 20. The last pin 150 is mounted for limited universal movement on a column 126 by means of pivots 144, 146. The column 126 is carried by a slide 128 which can be moved sideways by an air motor 130, the end positions of the slide being determined by adjustable stop nuts (not shown). The toe rest and sensing assembly, Figs. 3, 5 is mounted on a slide 30 which can be moved lengthwise by a screw 32 which can be rotated by electric motor 44 via sprockets 40, 36 and chain 42. A column 46 is mounted on the slide 30 and carries an air motor 48. A bar 52 is connected to the piston-rod 50 of the air motor 48 and carries at its upper end a cross-bar 96. A toe rest 110 has rollers 112 which run in tracks 114 in the cross-bar 96. A brake pad 118 carried by a lever 116 can be pressed against the bar 52 by air motor 122 to lock the toe rest 110 against heightwise movement. The column 46 also carries a cross-bar 54 on which can slide blocks 56. Secondary blocks 66 can slide within the blocks 56 and carry brackets 74 on which are mounted the sensing members 80 and 82 and their associated valves 76, 78. The position of the secondary blocks 66 relative to the blocks 56 can be adjusted by screws 68 which are rotated by knob 396 to adjust the lateral position of sensing member 80, 82 according to the style of shoe. The blocks 56 can be moved sideways by links 58 which are pivoted to the blocks 56 and to crank pins 60 on a gear-wheel 64. The gear-wheel 64 is connected by pinion 92, shaft 90 and pinion 88 to a rack 86 fixed to the platform so that as the slide 30 is moved along the platform 26 to accommodate different lengths of shoe, the sensing members 80, 82 are automatically moved sideways by the crank pins 60 and links 58 to compensate for the different sizes of shoe. When the slide 30 is moved towards the last pin 150 the sensing members 80, 82 are moved towards each other and when the slide 30 moves away from the last pin 150 the members 80, 82 move away from each other. In use the operator places a last on the last pin 150 with the vamp resting on the toe rest 110 and swings the last into contact with the sensing member 80 or 82 depending on whether the shoe is a left or a right shoe, the position of the members 80, 82 being such that the line of symmetry of the heel end of the last is then parallel to, but offset from, the line of symmetry of the wipers (not shown). When the last contacts the member 80 or 82 the valve 76 or 78 is operated and causes the motor 130 to move the last pin 150 to the left or right so that the line of symmetry of the last is in coincidence with the line of symmetry of the wipers. The hold-down assembly 235 Fig. 9 which includes a rear hold-down foot 242 and two front hold-down feet 244, is carried by a bracket 228 which is pivoted to a slide 202 at 230. The slide 202 is moved forwardly by an air motor 204 to move the hold-down assembly 235 from a retracted position to a position above the last. The bracket 228 is then tilted by a toggle linkage 220, 220 operated by air motor 212 to bring the hold-down feet 242, 244 into a plane parallel to, and just below, the wipers. The platform 26 is then raised by piston-rod 20 to bring the heel seat of the last into contact with the feet 242, 244 thus causing the last to tilt so that the toe of the last if lifted away from the toe rest 110. The toe rest 110 is  then raised by air motor 48 and when it contacts the last the brake 118 is applied by air motor 122 to lock the toe rest 110 in position. The heel band and wipers (not shown), which operate as described in Specification 1096553, then move from a retracted position to an operative position and the heel band is applied around the heel end of the last. The machine also includes an adhesive applying device mounted on the hold-down assembly 235. A hub 268 Figs. 9 and 11 is mounted for rotation on the shaft 240 which carries the rear hold-down foot 242 and has a nozzle 280 through down foot 242 and has a nozzle 280 through which adhesive is sprayed. The nozzle 280 is connected to an adhesive supplying pump 326 Fig. 1 by a hose 358, filter 360, passageways 288 in the shaft 240, annular groove 286, chamber 284 and passage 282 leading to the nozzle. The supply of adhesive to the nozzle is controlled by a valve stem 278 which is connected to a rocker arm 270. The rocker arm 270 Figs. 11 and 13) has a ball 276 which is spring loaded into contact with a cam plate 246. In its inoperative condition the ball 276 contacts a raised cam face 262 so that the valve stem 278 closes the passage 282. The hub 268 can be rotated by an air motor 300 connected to the hub by gears 296, 294. As the hub 268 rotates the ball 276 rides down an incline 266, and around a lower face 264 which raises the valve stem 278 so that adhesive is applied around the lasting margin at the heel end of the shoe. The ball then rides up an incline 266 at the opposite side of the plate 246 to the raised portion 262 to cut off the supply of adhesive. The position at which the valve 278 is opened and closed can be adjusted by moving the cam plate 246 by screw 250 operated by knob 260. After the adhesive has been applied the wipers are operated to complete the lasting operation.