Patent GB-190217120-A (GB)
Title: Improvements in Nail Making Machines.
Filed: 1902-08-02
Granted: 1903-07-23
Abstract: 17,120. Dorman, W. H., and Dorman & Co., W. H. Aug. 2. Nails.-Relates to a machine for making nails, particularly hob nails for boots and shoes, from a continuous length of wire. The end a, Fig. 1, of a coil of wire is passed upwards between two grooved discs a<1>, a<2> ; the disc a' is fast on the shaft a<3>, and a cone on the shaft carries a lever a<6> jointed to a cam-actuated link, which reciprocates the shaft to feed the wire upwards. The lever a<6> is secured by a winged nut a<8>, and may be adjusted to vary the reciprocation of the disc a'. The disc a' rotates freely on the spindle a'‹ in the link a<11>, which is mounted on a pivot a<12> and is actuated by means of a cam and link a<13> and a spring a<14>, so that the disc a' grips the wire, while the other disc moves it upwards, but is moved away from the wire on the return stroke. The shaft a<3> has a hand-wheel, by which it may be turned when the nut a<8> is slackened. The feeding-device is placed below the shank-forming and shearing device shown in Fig. 3, to feed the wire a through the die b, which is bevelled on one side, as shown in Fig. 5, to fit sliding dies b<3>, b<4>, which grip the wire to form a nail shank. The dies are actuated by toggles b<5>, b<6> jointed to a cam-actuated rod b<7>; the lever b<5> is jointed to a slide b<9> carrying the die b<4>; and the lever b<6> is jointed to the slide b<10> carrying the die b<3>. While the dies grip the wire, they are moved bodily along the face b, to shear off the piece between them, by means of a pivoted cam b<12> operated from a second cam by the rod b<15>, the slot b<16> engaging a roll and pin b<17> carried in a slide b<18>. The slide has vertical grooves carrying blocks which support the ends of the toggle spindle b<23>. From the dies b<3>, b<4>, the blank is raised by pincers c, c', Fig. 7, and carried through a quarter of a revolution to dies d, d', which grip it, while a slide d' pushes the portion b<2>, Fig. 5, forward to stand centrally over the shank. The slide is actuated by means of toggles d<16>, d<17> and a cam-actuated rod d<21>. To raise the blank from the dies b<3>, b<4>, Fig. 3, the rod c<3>, Fig. 7, carrying the arm c<9> and the pincers, is raised by means of a pivoted bell-crank lever, connected at one end to a collar on the rod, and at the other end to a link actuated by a cam. A lever on the rod, connected to a cam actuated link, turns the rod through the quarter revolution after it has been raised. A quadrant c<10> on the arm c<9>engages a notch in a lever c<12>, to raise the lever with the arm ; the lever is used to operate the finger c<1>, and is connected by a link c<15> to an arm c<14> on the finger. The finger is opened and closed by means of a cam-operated lever secured to a tube surrounding the rod c<3>. A lever c<19> is secured to the upper end of the tube, and is connected by links c<20>, C<21> to the spindle c<22>, upon which the lever c<12> is mounted. The joint pin c<24> of the links c<15>, c<12> is vertically over the rod c<3> when the pincers grip the nail, so that the nail is not released when the arm swings. The dies d, d' are opened by means of toggle-levers, and are closed by rolls d<7>, d<8> pressing against inclined ends of the dies. After the die d<2> has operated, a header is driven downwards by a cam to form the nail head roughly, and the nail is then carried to the finishing-header by an apparatus consisting of two pairs of jaws e<15>, e<16>, Figs. 8 and 12, sliding in boxes e<17> attached to the frame e', and actuated by cam projections e<9>, e'‹ on a sleeve e<24> on the horizontal shaft e' engaging projections on the jaw levers. The shaft e<1> is reciprocated by means of the lever e<4> and a cam-actuated lever e<3>, and the shaft e serves as a guide for the gripping jaws. The travel of the nail from the rough header to the finishing-header is divided into two parts, and a stationary jaw is provided half way to receive the nail from one pair of jaws at one stroke and deliver it to the other pair at the next stroke. The carrier e<2> is operated by means of the lever e<21> from the vertical rocking shaft e<20>. The finishing-header is provided with a stationary die f<1> and a movable die f<12>, which is actuated from the toggles f<2>, f<6> by means of draw - rods connecting the slides f<7>, f<11>, to the latter of which the die f<12> is connected. The header f<18> moves downwards to finish the head, the gripping-jaws then open, and a cam-actuated lever g pivoted on the stud g<1> strikes the nail head to discharge the nail down a shoot. According to the Provisional Specification, two rough - heading tools may be used before finishing the head.