Patent GB-996113-A (GB)
Title: Method and apparatus for pulling over and lasting shoes
IPC: A43D21/18
Filed: 1963-10-03
Abstract: 996,113. Lasting machines. J. S. KAMBORIAN. Oct. 3, 1963 [Oct. 19, 1962], No. 39016/63. Heading A3B. A method of pulling over and lasting the toe of a shoe comprises supporting bottom-down a shoe assembly which includes a last having an upper draped about its toe and an insole on its bottom with the bottom of the insole located below the top surfaces of wipers, gripping the lasting margin at its toe end portion and at each of its forepart portions and pulling downwardly at the gripped portions to stretch said portions of the upper about the last and create dogs ears between the gripped portions that extend outwardly of the last, raising the shoe assembly by an amount sufficient at least to bring the bottom of the insole to the level of the top surfaces of the wipers, pressing the dog ears against the bottom of the wipers during the rise of the shoe assembly and then advancing the wipers across the bottom of the last to wipe the lasting margin against the insole. A machine for performing the above method is described. The machine has a gripper head 174 (Fig. 16) which is mounted on a base plate 172 and which carries a toe rest 188, a toe gripper 196, two side grippers 216 (Fig. 14) and two retarders 250 (Fig. 15). The gripper head 174 is carried for height-wise movement by a piston and cylinder 168 mounted on the machine frame 10 (Fig. 16). The toe gripper 196 has a fixed jaw 202 carrying a toe gauge 204, a movable jaw 214 carried by a piston and cylinder 206 and is carried by a piston and cylinder 197 for heightwise movement with respect to the gripper head 174. Each side gripper 216 (Fig. 14) is mounted for movement widthwise of the shoe on an angled bracket 220, pivoted at 221 to the gripper head, and is swung about its pivot by a piston and cylinder 222. Each side gripper 216 is closed by a piston and cylinder 240 and is moved heightwise with respect to the gripper head by a piston and cylinder 226. Each retarder 250 (Fig. 15) is adjustably mounted on a slide 254 on the gripper head and has a blade 268 which is moved heightwise with respect to the gripper head by a piston and cylinder 220. The piston and cylinders 197, 226 which move the toe and side grippers heightwise are each controlled by a manually operated three-way valve (not shown) which in its first and normal position connects the cylinders to a low pressure air line, but in its second and third positions connects the cylinders to a high pressure air line or the atmosphere respectively thus allowing each gripper to be independently raised or lowered to adjust the position of the upper on the last. The machine has wipers 20 (Fig. 4) carried by cam plates 18 which can slide on pins 24 on a wiper head 16 which is mounted for sliding movement in the machine frame 14. A piston and cylinder 36 moves a slide 28 which is connected by a link 38 to one end of a lever 40 which is pivoted at 42 to the wiper head and is connected at its other end to a link 46 which is resiliently connected to the machine frame 14 by a piston and cylinder 56. This arranged causes the slide 28 to move forward at a greater speed than the wiper head 16. The slide 28 is also connected by links 26 to the cam plates 18 to move the wipers 20 inwards. A toe band 124 (Fig. 12) is resiliently mounted above the wipers. The band 124 may be of polytetrafluoroethylene and is attached to a cross-head 88 by spring steel strips 118, 130 and to the machine frame by spring-loaded bolts 100. A carriage 278 (Fig. 2), moved lengthwise by a piston and cylinder 280, carries a toe clamp 292 on a rod 290 which is moved down by a lever 286. Light clamping pressure is exerted by means of piston and cylinders 302 and heavy clamping pressure is exerted by means of a wedgeshaped cam 312 moved by a piston and cylinder 308. A heel clamp 336 (Fig. 2) is mounted on a rod 330 which is pivoted to the machine frame at 332 and is moved lengthwise of the shoe by a piston and cylinder 358. The machine has an automatic fluid control circuit (not shown). At the beginning of the automatic cycle the operator places an upper and insole on a last in the machine using the toe gauge 204 to position the last and places the margin of the upper in the toe and side grippers, the gripper head being in its lowest position. On depression of a treadle 426 (Fig. 2) the toe gripper 196 is closed and lowered and then the side grippers are closed and lowered and the machine stops to allow the operator to adjust the positions of the upper on the last by means of the threeway valves. On further depression of the treadle the gripper head is raised and during this rise the retarders are raised to press the margin of the upper against the bottom surface of the wipers. The toe of the upper is also pressed against the toe band 124 during the upward movement of the gripper head. The toe clamp then moves forward from an out of the way position to an operative position and applies light clamping pressure by means of piston and cylinders 302 and the heel clamp moves rearwards to clamp the heel. The side grippers are then swung inwards by piston and cylinders 222 and the wipers advance. As the wipers 20 engage the upper the grippers open, the retarders are lowered and the gripper head is lowered leaving the shoe supported on the wipers. The toe clamp then applies heavy bedding pressure for a predetermined time at the end of which the various parts return to their initial positions. Specifications 963,723; 963,727; 970,604; 996,115 and 996,116 are referred to.