Patent GB-191213609-A (GB)
Title: Improvements in or relating to Mechanism, applicable for use in connection with Machines for Working Boot and Shoe Uppers Over Lasts, for Securing Uppers in Overworked Position.
Inventor: BOULT ALFRED JULIUS
IPC: A43D13/00
Filed: 1912-06-10
Granted: 1913-08-11
Abstract: 13,609. Boult, A. J., [United Shoe Machinery Co.]. June 10. Lasting.-Automatically - operated means are provided for tightening and securing the toe binding-in wire or tape to secure a lasted upper in its overworked position. The invention is shown applied to the pulling-over and lasting machine described in Specifications 7005/00 and 9793/08. Binder-supporting means comprising clamps formed on the arms 50 of angle-levers 50, 51 are pivoted at 52 to carriers 42, which carry the pressers 40 for pushing the sides of the upper into position between the channel lip and the feather of the insole. Each angle-lever is formed by a pair of bell-crank levers having two arms yieldingly-pressed to each other by a spring 55. The free arms form the arms 50, 51 of the angle-lever. Each clamp comprises a rigid jaw 60, the lower gripping-face of which is downwardly and forwardly inclined, and a loose roll 62, which is guided between walls 63, 64 and is pressed forwardly by a spring 65 to wedge the binder against the rigid jaw. The roll is moved rearwardly to permit the insertion of the binder by a finger lever 66. A fixed shear blade 70 is attached to the presser 40, and a sliding blade 72, having a pin-and-slot connexion with the presser, has its end connected to the member 51 of the supporting angle-lever. The member 51 is normally pressed outwards by a spring plunger 75, so that the clamp is held forwards and the movable blade of the shears is held overlapping the fixed blade. The blades hold the binder, in this case a tape, above its straight course from the clamp, so that, when they are opened, the tape drops between them into position for cutting. The binder passes through a groove 76 in the presser, the groove having a high inner wall 78 and the lower wall of the groove being tapered towards the toe part of the shoe. The binder is drawn from a reel, passed round the toe of the upper by the operator, and gripped in the two clamps. It is secured by tacks driven by devices which are movable from an outer position into position over the shoe bottom. Each tacking-mechanism is provided with an abutment which is arranged to engage the arm 51 of the angle - lever and to press it inwards, thus moving the arm 50 outwards and straining the binder round the toe. The position of the tacking- mechanism is defined by the engagement of the arm 51, with the abutment on the tacking- mechanism pressing it, with the side face of the carrier 40. This position is arranged so that when the tacks are driven they pass through the tape binder. Staples which straddle the binder may be substituted for tacks. If the staples are used, a wire binder may replace the tape. In a modification shown in Figs. 13, 15, and 16, a wire binder is used, the ends of which are bent round anchoring-tacks. In this case, each wire-clamp, comprised by a fixed jaw 160 and a spring jaw 162, is supported on a lever 150 operated as in the first modification through a spring connexion with a second lever 151. The levers are pivoted on a projection from the tack block-carrying arm 107, and the lever 151 carries a cam-roll which moves along a spring- supported cam-surface and so causes the wire to be drawn tight as the tacking-mechanism moves in over the sole. The arm 107 may be given a slight rearward movement, which further tensions the wire. Each arm carries two tack holders, from which tacks are driven by hammers 172. The one holder 176 is of ordinary construction, and the other 175 is shown in Fig. 16. The tack passes from a shoot 174 into a throat 179, at the bottom of which it is held by spring jaws 178. The lower part of the throat is formed by a tube 180, which can rotate in the holder 175. One end of a strong spiral spring is connected to the tube and the other is connected to a pinion 190 engaged by a rack 191, which is yieldingly secured to a stop 192, Fig. 13, on the machine frame. As the tack arm moves inwards, the pinion is drawn past the rack and the spring put under tension, the tube 180 being prevented from rotating by a pawl 197 on a lever 198 engaging a recess in a disk attached to the tube. The lower end of the tube carries a bending- device 185 comprising a groove between two projections situated to one side of the tack opening. The binder wire passes through the groove, and when the pawl 197 is tripped, the wire is bent round the tack as it is driven, by the rapid rotation of the tube 180 caused by the unwinding of the spiral spring. The lever 198 is moved to trip the pawl, and also to cut the wire, by the hammer block striking an adjustable stop 199 on its upper end. The lower end of the lever carries one knife which co-operates with a second secured to the tack-holder 175. In a modification of the means for bending the wire, the block carrying the bending-device can rotate in the tube, its movement being limited by a pin on the tube engaging the ends of a slot in the block. One of the projections of the bending-device forms one member of the wirecutting device, and co - operates with a fixed cutter. When the tube is released, it attains a high speed of rotation during its short period of free movement before bringing the bending- device into operation. In a further modification, the wire is given a sharp turn between the bending-device and the cutter, thus preventing the binder from slipping back after being cut.