Patent GB-129063-A (GB)
Title: Improvements in or relating to Pulling-over or Pulling-over and Lasting Machines.
IPC: A43D13/00
Filed: 1918-05-28
Abstract: 129,063. British United Shoe Machinery Co., (United Shoe Machinery Corporation). May 28, 1918. Pulling-over. - Machines, such as those of the type described in Specifications 7005/00 and 920/15, are provided with means for moving the side grippers automatically heelwards of the last after they have released the upper, so as to avoid any interference between the grippers and the wiping and tacking devices. Machines of this type are also provided with an improved construction of mechanism for effecting the adjustment of the side grippers lengthways of the last. Each of the side grippers, which are constructed and operated substantially as described in Specification 920/15, is connected by a pair of pivoted slides 26, 24, Fig. 1, to a rack-bar 34 in engagement with a pinion 36 on a rock-shaft 38. This shaft carries a plate 44 which is connected by a slotted link 46 and pin 42 to a slide 40 operated from the main cam shaft of the machine. During the updraw, the shaft 38 is held against movement by a spring catch 58 in engagement with a lug 60 on one of the side tacker arms; but, as these arms are closed inwards, the catch is released, and a spring 56, acting through the link 46, turns the shaft 38 to move the grippers heelwards as soon as they are tripped to release the upper. The mechanism is reset as the various operative parts of the machine return to their normal positions. To provide for initial adjustment for various sizes &c. of shoes, the plate 44 is connected to the shaft 38 through a link 48 pivoted to the end of the shaft and carrying a stud 50 adapted to engage one or other of a series of holes in the plate 44. In the construction shown in Figs. 2 and 3, in order that either of the side grippers may be adjusted lengthways of the last independently of the other, each pinion 210 is formed on a sleeve 218 surrounding a shaft 220, the right-hand sleeve being journaled in a bracket 222 bolted to a portion 223 of the machine frame, while the other sleeve is journaled in a bracket 224 on a frame member 225. Each sleeve has clamped to it a disk 226 which is connected by bolts passing through distance-pieces 232 and a ring 230 to a handle 228. To retain each gripper in its adjusted position, a friction member in the form of a leather washer 238 is arranged between each disk 226 and a casting 240 secured on the end of the shaft 220; these washers are nipped on movement into operative position of a wedge 242 arranged between an inclined bearing 243 on the bracket 222 and the right-hand disk 226. When either hand-lever 228 is turned, the tendency of the shaft 220 to rotate is overcome by means which are associated with mechanism for moving the side grippers to effect foredraw. This mechanism comprises an adjustable plate 248 loosely mounted on the left-hand sleeve 218, but connected to the casting 240 by means of a spring pin 254. A treadle rod 256 controlled by a spring 257 is connected to the plate. After depression of the treadle to effect the foredraw, a lug 266 on the plate 248 engages a pin 264, and so prevents movement of the shaft 220 in the one direction, movement in the other direction being prevented by a spring pin 258 engaging under a lug 260 on one of the usual side tacker arms. When these arms move inwards, the pin 258 is released and the side grippers, after being tripped open, are moved rearwards by the spring 257 until a second lug 262 on the plate 248 engages the pin 264, in which position the shaft 220 is again held against rotation. The wedge 242 is controlled bv connexions with the usual lever for moving the side grippers and tackers laterally of the last. As the lever is moved to cause the side grippers and tackers to close inwards, the wedge 242 is withdrawn by the engagement of a stop 272 on a rod 270 with a lug 274 on the wedge member; this releases the pressure on the friction members 238. permitting springs 276 in the castings 240 to act on pins 278 projecting from the disks 226 in such a manner that the sleeves 218 are turned relatively to the shaft 220, and the side grippers are restored to their normal relative positions. The reverse movement of the lever for returning the side grippers and tackers causes the wedge to be drawn again into operative position.