Patent GB-684410-A (GB)
Title: Improvements in or relating to machines for conforming shoe uppers to the shapes of lasts therein
IPC: A43D13/00
Filed: 1949-12-14
Abstract: 684,410. Lasting and pulling over machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). Dec. 13, 1950 (Dec. 14, 1949], No. 32060/49. Class 17 (i). The gripper of a step-by-step lasting machine is so operated that it may engage successive portions of the upper in closely spaced locations, of the order of “ inch, so as to get even lasting stress and stretching all round the shoe upper without seriously disturbing that portion which has been secured to the shoe bottom. This is done by moving the gripper with the jaws opened longitudinally of the shoe, along a full line a, Fig. 16, after a portion of the upper has been tensioned and secured to an insole by an overlaying member, then moving it downwards on line b, outwards along line c to the edge of the insole, at a point where the lasting margin is nearly vertical, and then returning along line d to a position in line with the overlaying member, so that the gripper is ready to operate at a location near where it was last secured, the shoe having been fed automatically during the cycle in time relation with the gripper. The direction of feed is reversible for operating on opposite sides of a shoe from the toe end, the gripper operation being similarly reversible by the same controlling hand lever. The work may alternatively be fed by the operator. An illustrative form of machine having certain of its parts arranged similarly to those in Specification 283,978, [Class 17 (i)], is described. It has a gripper with jaws 30, 32, Figs. 2, 3, 16, an overlaying member 34, in time relation with which the gripper is operated, for securing in overlasted position portions of an upper to an insole, e.g., by adhesive, an automatic feed wheel 36 which engages the shoe bottom and feeds it in time relation to the gripper and an edge gauge roll 38. These are mounted on a head 40, Fig. 2, and operated cyclically by cams mounted on a camshaft 44 driven from a power source through a clutch under control of a pair of treadle rods 46, 48. The gripper is suspended from a two-part updraw lever 50, Fig. 2, on the head 40 and carries a closing rod 72 to close the jaws 30, 32 against a spring 74 during the working cycle, when the gripper is adjacent to or in line with the member 34, for seizing, updrawing, overdrawing and releasing portions of the upper, the gripper action being controlled by a hand nut 76 and lever 78 (not shown). A screw 58, Fig. 2, moves the jaws 30, 32 longitudinally of the shoe bottom. It is turned by a rack 82, which engages a pinion 80 on the screw, to one of two positions, according to the direction in which the shoe is to be fed, according as whether links 96, 98 are raised or lowered. This is done by a cam roll 109 and cam 111 (not shown), on main shaft 44 through rods 120, 122 pivoted to the links 96, 98, under the control of an operating hand lever 128. The member 34, Fig. 3, slides in time relation to the gripper in a guide block 150 which may be tilted to vary the angular path of movement of a nose 181 of a surface 180 on the member. A hammer 182, Fig. 3, carried by a plunger 184 is downwardly projected by a spring 194 (not shown), through an opening 185 in the operating surface 180 of the member 34 to strike a sharp blow to the overlaid lasting margin and assist its adhesion to the insole. The hammer 182 is then slightly raised so as not to interfere with the work feed. The feed wheel 36 is carried on a spindle 298, Fig. 10, in the head 40 and is rotated through a double-faced ratchet wheel 312 and pinion 340 movable to engage one or other of racks 342, 344 linked by a member 350 to a block 352 secured in a groove in an arm 356 mounted on a shaft 154 and operated by a cam 362 (not shown), on shaft 44 and reciprocated once for each revolution in time relation to the gripper and member 34. The wheel 36 also holds the work stationary against movement in the direction of feed when the gripper is returning lengthwise of the shoe. The guide roll 38 is rotatably supported on a member 420 pivoted on a stud 422 on a block 424 adjustably secured to head 40 so as to be adjustable vertically and laterally. The gripper jaws 30, 32 are closed on the upper just before their return to mid-way position has been completed, when the shoe is stationary, so that as the movement is completed a fulness is formed in the margin between the gripper and that portion of the upper which has been secured to the insole which tends to prevent disturbance of the attachment without pleating the upper.