Patent GB-761465-A (GB)
Title: Improvements in or relating to machines suitable for use in performing lasting or analogous operations on shoes
IPC: A43D21/16
Filed: 1953-11-07
Abstract: 761,465. Lasting and like machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., and FRAMPTON, S. E. Nov. 8, 1954 [Nov. 7, 1953], No. 30873/53. Class 17 (1). In a machine for performing lasting or analogous operations on shoes having an intermittently operating gripper for tensioning the stock successively in different locations along the marginal edge of the shoe bottom, the gripper reciprocating across the edge of the shoe in a plane extending transversely to the edge of the shoe bottom member, and a wiping device to lay the tensioned margin inwardly across the edge of the shoe bottom member and to press it thereon so as to secure the margins to the bottom member by adhesive applied to the margin and/or member, the gripper is given a movement towards the wiper so as to impart a feeding movement to the stock. The marginal portion gripped in the jaws is presented to the wiper closely adjacent the latter and close to the shoe bottom member. The gripper after seizing the stock is first moved inwardly over the shoe and upwardly away from the shoe bottom, and then downwardly towards the shoe to position the tensioned margin. Front jaw 8 is fixed to a rod 10 slidable without turning in sleeve 14 which bears the carrier 16 for the rear jaw 10, sleeve 14 being journalled in a tubular portion 17 of the gripper-supporting member 18. The jaws are offset laterally from the axis of parts 12 and 14. Eccentrics 33, 58 act via stud 28 and member 18 to reciprocate the gripper and by tilting the axis of parts 12/14 causes the gripper to move in the path a b c a, Fig. 7a. Jaw 8 is urged toward jaw 10 by spring 60 which is adjusted by positioning the rear abutment of the spring by means of latch 174 and toothed member 176, and the opening and closing movements are controlled by eccentrics 82 and 96 which move stud 79 as at PQRSP, Fig. 7c, and through link 78 &c. bring about relative movement of parts 12, 14 along their axis. The work feeding movement of the gripper is obtained by rotating carrier 16 about the-axis of parts 12 and 17, with parts 44, connected to sleeve 14, 46, 48, 50, and 54, the latter bemg connected to stud 28. The wiper comprises a continuously rotating disc 108, having helical ribs or grooves at its periphery, which is secured to a shaft 112 journalled in a pivoted lever 114/120 which is urged by spring 118 to press the disc downwardly, the spring being adjusted, by means of a handle 143, by engaging a wedge member 137 at the front of the spring with a selected one of a plurality of notches in an arm 120. (The ribs or grooves assist the gripper in feeding the work.) The holddown foot 102, which is pivotally mounted on a system including a pivoted bell crank 142/144, may yield upwardly against a spring 138 to a limit determined by the engagement of sleeve 134 with a shoulder on pin 136, movement in the opposite direction being limited by engagement of the sleeve with a collar 140. The action of spring 138 permits the holddown to follow the contour in the scooped waist of the shoe, but if the work is flat, 138 is rendered inactive by rotating sleeve 134 to engage pin 136. Repression of the treadle acts through 245, 236 to rotate lever 230/234 anticlockwise so that (a) link 238 moves downwardly and swings lever 240/242 so that a screw on the latter engages a member on the hub of clutch disc and causes the clutch to engage, and (b) via 228, 220, 226, 216, rod 208 and abutment 210 are moved forwardly swinging arm 67 so as to free the front jaw to the action of spring 60, and straightening toggle 206/200 to swing lever 142/144 anticlockwise so that the holddown foot is moved downwardly into work supporting position. When the treadle is raised the rearward movement of rod 208 causes the jaw 8 to be held fully forward, and the breaking of toggle 206/200 swings the holddown forwardly and slightly upwardly to inoperative position. Means to stop the machine with the jaws fully open includes a three-armed lever 260/ 262/264. A stop finger 268 is pivoted to arm 260 to swing widthwise of the machine. Arm 262 is connected, via a pin and slot connection with link 272, to lever 222/220. Arm 264 is connected to the upper end of piston 284 of a dashpot arrangement which is slidable in cylinder 286 and urged downwardly by spring 288. Cylinder 286 connects via a downwardly seated ball valve 290 with the oil reservoir, and via an upwardly seated ball valve 294 with a pipe 300 for distributing the oil for lubrication. A disc 304 on shaft 42 has a helical cam face 306 (not shown) around two thirds of its periphery. A disc 307 on the hub of disc 304 and adjacent thereto has a projecting lug 310 presenting a stop face 308 for engagement by finger 268. A pin 312 on disc 307 projects into a slot 314 in disc 304 and limits relative rotation, and pin 316 on disc 307 projects into a groove 318 in disc 304 and abuts the end of a spring 320. Repression of the treadle acts through 220/222 and 272 to swing lever 260/ 262/264 so that finger 268 moves out of engagement with face 308, and shaft 42 is freed for rotation, piston 284 moving upwardly and drawing oil through valve 290. Release of the treadle permits spring 288 to turn lever 260/262/264, the rate being controlled by the escape of oil through valve 294, and disengages the clutch, but shaft 42 continues to rotate and slows down while lever 260/262/264 brings the end of finger 268 into engagement with cam face 306 (not shown) which it follows until it engages face 308 when disc 307 is arrested, spring 320 providing a cushioning effect. Shaft 42 comes to rest with the gripper fully retracted. The shoe is positioned forwardly and rearwardly of the machine by means of an edge gauge 104. In the Provisional Specification a different arrangement of levers and springs &c. is described to bring about the movement of grippers, holddown, and wiper described above. Specification 682,021 is referred to.