Patent GB-131122-A (GB)
Title: Improvements in or relating to Lasting Machines for use in the Manufacture of Boots or Shoes.
IPC: A43D21/16
Filed: 1918-08-09
Abstract: 131,122. British United Shoe Machinery Co., (United Shoe Machinery Corporation). Aug. 9, 1918. Lasting.-Relates to end-lasting machines of the type described in Specification 25492/13 and 14831/09, wherein opposed shoe-clamping members engage the top and bottom of the shoe, wipers or the like embrace the end, and relatively movable grippers draw the upper subsequently to the clamping, and consists in grippers moving outwardly from the edge of the last to spread the upper for the action of the wiping-means, a side-gripper mounted to swing about an axis perpendicular to the last bottom so that side-draw is reduced to a minimum at the tip seam, and closing mechanism for the gripper jaws such that the movable jaw describes a path of varying curvature to reach out over and gather the upper materials against the fixed jaw. The shoe is held between a jack 38, Fig. 7, .engaging the toe and a. hold-down 142 engaging the sole, a semicircular feather 164 supporting the edge of the sole. Wipers 114, Fig. 4, pivoted at 116 are carried by plates 110 guided by rollers 118 and provided with teeth driven by rackbars 128 to close the wipers in when a plunger 106 moves in the direction of the arrow. Each pincer comprises a fixed jaw 256, Fig. 11, and a movable jaw 264 closed bv downward movement of a plunger 262 and having a link 266 to the fixed jaw, such that it describes a path of varying curvature while closing. A spring 282 is adjusted to allow the grippers to yield to prevent tearing of the upper. Two side grippers, Fig. 3, are mounted to move about adjustable pivots 207, are adjustable along slots 216 by spring-controlled dogs 222, and are resiliently connected by levers 228 with a plunger 224 which moves the end pincer. The various mechanisms are driven in timed relation by three cam disks 80, 82, 90 each having a shaped periphery and a groove in one side, so that six cams are provided operating the wipers, jack, hold-down, sole control foot, the horizontal movement of the fixed pincer jaw, and the vertical movement of the movable jaw, respectively. The cam-shaft is driven by spur-gearing from a pulley through a clutch normally spring- pressed out of engagement, but engaged by wedgemechanism operated by a pedal. On the camshaft is a disk having two peripheral recesses into which enter a roller on a sliding bar carrying the clutch-operating wedge, to stop the machine at one position in the cycle, and at the end of a complete cycle. The operator attaches a wire to a tack at one side of the tip seam of a shoe to be lasted, draws the wire across a guide, presents the sole to the hold-down 142 and sole control foot 164 and starts the machine. The shoe is then clamped, the grippers closed on the edges of the upper which is foredrawn and outdrawn from the edge of the last over the now stationary wipers 114, Fig. 12. The clamps are then lowered so that the sole is below the wipers, which are then closed on the shoe and advances over the edge of the sole, the foot 164 being raised to clear them, the pincers also moving inward and the jack rising to exert pressure against the wipers. The wipers then slightly retract and the jack is slightly lowered and the cam-shaft is stopped to allow the wire to be tightened about the toe. The machine is restarted and the wipers force the wire against the shoulder formed at the base of the sole lip, when the wipers retreat, the pincers open and all parts return to their original position, the operator twisting the wire over the tack on the other side of the tip seam. Ordinarily the upper is pulled from between the pincers by the time of the first automatic stop. The jack 38, hold-down 142, and sole-control 164 can vield away from the shoe against adjustable springs.