Patent GB-190717665-A (GB)
Title: Improvements in or relating to the Supporing and Positioning of Work in Machines used in the Manufacture of Boots and Shoes.
Filed: 1907-08-02
Granted: 1908-11-02
Abstract: 17,665. Bates, A., and British United Shoe Machinery Co. Aug. 2. Nailing; paring; burnishing; ornamenting.-Boot and shoe machines in which there is a work-holder and an operating-tool, and particularly trimming, finishing, and nailing or slugging &c. machines for the heel or heel seat, are provided with mechanism which, without assistance from the tool, controls or automatically effects relative movement between the holder and tool, so that the point of operation of the tool is transferred in the necessary path round the work. The invention is shown as applied to a tacking-machine, X, Fig. 2, being the driver nozzle. The automatic mechanism comprises a pair of cranks C, D secured to shafts C<1> D<1> Figs. 2 and 3, rotatably mounted in a bracket B. The pin D<2> of the crank D has pivoted to it an extension E<1> of a member E carrying a self-centring work-holder, which comprises two spring-controlled fingers F geared together at their rear ends, and a support comprising two portions E<4> secured to arms E<5> pivoted on studs E<3>, The pin C<2> of the crank C passes through a slot E<2>in the member E. The cranks C, D are geared together, and their pins may be adjusted along them, so that when they are moved the work-holder will be caused to travel in a heel-shaped path beneath the nozzle X. Obviously, the work may be stationary, and the operating-tool mounted at the point on the holder that moves in the path corresponding substantially to that of the curvature of the heel. The crankshafts C', D<1> are geared together through a train of wheels, and the mechanism for driving them comprises a double-ended pawl H, Figs. and 3, pivoted on an oscillating carrier H<1> loosely mounted on a shaft J", which is located within the crankshaft D'. The carrier H<1> is coupled up to a reciprocating part of the machine, and controls the pawl H so that it engages with one or other of two oppositely-disposed ratchet-wheels J, J<1> fast on the shaft J*; it is yieldingly held in engagement with these wheels by a toggle device comprising a ballended strut K and a spring-plunger K<1>. Movement of the pawl therefore rotates the shaft J*, and a clutch or locking-device is provided between this shaft and the first of the train of gear-wheels connecting the shafts C', D<1 >so that this movement is communicated to the shaft D' and so to the cranks. The clutch comprises two spring-pressed balls Q, Fig. 5, adapted to be moved into or out of wedgeshaped recesses P<1> between a block P supported on the gear-wheel above mentioned and a casing B<1> secured to the bracket B, this movement being effected by arc-shaped sliders P' adapted to be engaged by an extension J<3> on the shaft J*. Alternatively, the wheel M may be rotated by the engagement of the shaft J* with the pin that secures the crank D to its shaft and extends loosely through the shaft J*. A split plate surrounding a collar on the shaft J* prevents over-running of the shaft at the end of the driving movement of the pawl H. With the arrangement above described, the work-holder is held rigidly at all times, except during its feed by the pawl H. An adjustable reversing device, comprising two projections R', R<2>, Fig. 3, secured to a member R which surrounds the shaft D' and is coupled up to the pawl H, is arranged in the path of the crank D so that, at the end of the path of movement required for nailing one shoe, the pawl H will be tipped to cause it to engage its other ratchet-wheel, with the result that the next shoe is operated upon in the reverse direction. In order that the machine may be used for operating upon parts of the shoe other than the heel or heel seat, the bracket B carrying the automatic mechanism is mounted on a shaft B<2>, Fig. 2, coupled up with a knee-lever, a movement of which turns the bracket into such a position that the mechanism it carries becomes inoperative. A spring-pressed plunger forms a locking-device to hold the bracket in its operative or inoperative positions. The invention may be readily applied to other machines, for instance to " quarter-slugging " machines. This may be effected by omitting the reversing projections R<1>, R<2> and substituting a pair of removable spring stops, which may be arranged to indicate to the operator how many slugs have been driven, when by suitable mechanism the wire feed may be stopped.