Patent GB-174401-A (GB)
Title: Improvements in or relating to mechanism for conforming shoe uppers to lasts
IPC: A43D21/16
Filed: 1920-09-25
Abstract: 174,401. British United Shoe Machinery Co., Ltd., (United Shoe Machinery Corporation). Sept. 25, 1920. Lasting and pulling-over. - In a pulling-over and end-lasting machine, having means for fastening the upper in lasted position, the shoe, after being pulled-over by power, is shifted by power to another position more convenient for endlasting. Two shoes may be simultaneously treated in the machine, one being pulled-over while the lasting of the other is being completed. The pulling-over devices accompany the shoe in its displacement from one position to the other. As shown, the shoe is first positioned against a solerest 1, Fig. 2, with the margin of the upper between grippers 35. The updraw is produced by levers 30, 31 oscillated by cams on a shaft 20, up-draw springs 32 being adjusted by wedgemembers 34 shifted by a handle 38. The cams are turned by a gear-segment 19 operated by a rack 16 having a similar rack at its lower end gearing with a segment on a lever oscillated by the main cam shaft. Out-draw and over-draw are produced in the case of the side-grippers by a cam-operated wedge member 60, Fig. 3, engaging rollers 52 on levers 50 having pressure blocks 51 acting as stops against overdraw springs 59. Preliminary adjustment of the side-grippers is made by a handle 55 on a pinion 56 gearing with racks on slides 54 carrying the pivots of the levers 50. Preliminary lateral adjustment of the toe-grippers, for right or left shoes, is produced by a handle 70 operating a pinion 68 gearing with a rack on the gripper guiding slide; while outdraw is produced by a pressure member 65 moved by a cam through a compression spring. A handlever 75, Fig. 2, carries a pinion gearing with a segment on a rocking lever 74 connected with the up-draw levers 30 by an equalizer bar 76, formanual adjustment of the upper during pulling- over. The bar 76 is extended to form handles for adjusting the lace-opening of the shoe. When the pulling-over is complete, a cam on the lower shaft raises a rod 6 turning the whole pulling- over head about the cam-shaft 20, carrying the shoe to toe-lasting mechanism comprising side wiper plates 182, Fig. 6, pivoted to a toe-wiper plate 180 and thrust bars 185. The plate 185 is free to slide laterallv as the shoe contacts with the wiper plates, and is pressed towards the shoe by a spring 172, Fig. 7. Handles 156, 166 enable preliminary longitudinal and vertical adjustment of the wiper plates to be effected. The heel-rest 100 is self-adjustable laterally by parallel links 104, and is pressed against the shoe by a spring 112 engaging a lever 111 having a gear segment meshing with a pinion 113 gearing with a rack slide on the heel rest. When the shoe is positioned, a final slight forward movement is given to the rest 100 by a cam-operated pawl 115 engaging a ratchet wheel 114 connected to the pinion 113. Similar mechanism is provided for the toe-rest, which comprises two pressure blocks 132, Fig. 9, on levers 130 provided with a centring-blade 135 and a spring 134 tending to press the blocks together. The cam causing the transfer of the shoe from the pulling-over to the wiping position is so formed that the shoe is given short reciprocations up and down in the wipers. As the toe-wiper plate 180 is pressed forwardly against its spring 172, the side-wipers 182 are caused by the thrust bars 185 to give an inward wipe at the sides of the toe. Finally, the wipers are advanced over the shoe bottom by movement of their carrying arm 150, Fig. 7, actuated by a cam on the power shaft. This upwipe, over-wipe, and the pressing down of the over-wiped margin by uplift of the toe rest, or any two of these operations, may be repeated. In the rear of the wipers 182 are further side wipers 210, Fig. 9, having top and bottom guides 206, 208 between which the wipers slide and rock vertically restrained by spring-held rollers 215. These side wipers are moved inward over the shoe by rack slides 238, Fig. 10, until gauges 242 on the adjustable lower guides 206 contact with the shoe. Further movement of each slide 238, allowed by the yielding of a spring-supported wedge 245 removes a trip from a shoulder 240 on a tack-driver bar and allows a spring 230, Fig. 9, to depress drivers 224 to drive tacks (which were brought down by the pulling-over head) from tack blocks 220 into the shoe. The tack driver bars have adjustable stops 232, to allow holding tacks to be partially driven only. The toe end of the lasted upper may be secured by tacks or a binder; but, preferably, the toe stiffener placed between upper and lining is of the kind stiff and hard at normal temperatures but soft and pliable and adhesive at a slightly higher temperature. This stiffener is heated before assemblv and hardens while the upper is held in lasted position by the wipers and another shoe is being pulled over. Fig. 12 shows the clutch-operating mechanism. The end of the rod 271 from the treadle is bevelled to operate a pivoted finger moving a tripping slide 275. On displacement of this slide a spring 284 removes a brake and moves a wedge 282 to engage the clutch. At the conclusion of each part-cycle a cam 270 raises a roll 272 to free the clutch and apply the brake. Specification 149,964 is referred to.