Patent GB-155361-A (GB)
Title: Improvements in or relating to machines for arranging nails
IPC: A43D71/00
Filed: 1919-09-12
Abstract: 155,361. British United Shoe Machinery Co., (United Shoe Machinery Corporation). Sept. 12, 1919. Loose-nailing.-Relates to detail improvements in machines for arranging heel nails, such as those of the type described in Specification 4369/08, particularly to adapt them for loading nail supply blocks for use in the heel-attaching machine described in Specification 155,360, [Class 17 (i), Boots and shoes, Apparatus for making &c.]. The usual rotating nail-drum 10, Fig. 1, delivers nails upon the upper sections 12 of a series of raceways, from which they pass over the usual adjustable nail-balancing bar 14 and proceed, head first, along the lower sections 16 of the raceways. The raceways are mounted in a frame 18 supported on rocker arms 20, Fig. 4, mounted to oscillate about axes 22. The lower ends of the front pair of rocker arms are connected by a rod 24 carrying a sleeve 26 for an adjusting-screw 28, which passes loosely through a yoke 30 acted upon by tension springs 32. The rod 24 rests in slots in eccentric-rods 40 surrounding straps on a shaft 44, which is driven as described in Specification 4369/08. The rearward movement of the rod 24 is limited by stop screws 46, which may be adjusted to stop the rod 24 before the eccentric-rods 40 reach the rearward limit of their movement, with the result that, in their forward movement, the rods 40 impart a blow to the rod 24. To remove improperly-positioned nails from the raceways before they reach the usual delivery roll, the machine is fitted with two clearers comprising cross-bars 48, 66, Fig. 1, having fingers 50, 68 depending from them and entering the spaces between the raceways. These clearers are operated in unison by connexions with a stepped cam 62 on the gear-wheel 64 which drives the nail drum 10, the cam causing the rearward stroke of the fingers to be in the nature of a blow. The nails pass from the raceways into a series of holes 74, Fig. 2, in the delivery roll 76, and are stopped by the usual stop bar 78. The roll is rotated at the proper time by connexions with a face cam on a cam-disk 80, Fig. 1, so that the nails fall into shoots 94, Fig. 2, the cam being shaped to impart a rapid shaking movement to the connexions to dislodge the nails. At the lower ends of the shoots the nails are arrested by a spring-pressed gate 114, beneath which is located a reverser 100 geared at 104, 106, Fig. 1, to the delivery roll. As the reverser moves in one direction it causes the gate 114 to be withdrawn to allow the nails to pass into the reverser, and as it moves in the opposite direction it delivers the nails, points foremost, to nail tubes 120. These are made of coiled spring wire and carry at their upper ends flanged heads which, with the coils in tension, are passed through slots in a bar 124, Fig. 2, so that the flanges are seated in countersunk recesses in the bar. The lower ends of the tubes are secured in a foot-piece 128, Figs. 2 and 3, supported by pivoted arms 130, which are bridged by a yoke-piece 134 connected by a rod 136 and a lost-motion connexion 138 to a lever 140 operated from the cam disk 80. The nails pass from the foot-piece 128 to a nail-supply block 168, Figs. 1 and 2, adapted to be fed intermittingly past the foot-piece, which is raised and lowered in timed relation to the feed to clear any nails which may project above the block. This block is positioned by an abutment 166 in a support 152 mounted to slide in guides 148 in castings 150 secured to or forming part of the base of the machine. A spring 156 tends to move the support rearwards, and a dash-pot 162 is provided to cushion the movement, which is limited by an adjustable stop screw; this screw arrests the support with any desired row of holes in the block 168 in register with the openings in the foot-piece 128. The support 152 is provided with a ratchet plate 172, which is engaged by a spring-pressed feeding-pawl 190, Fig. 6, carried by a slide 174 operated through connexions with the cam-disk 80; an adjustable spring-pressed pawl 194 prevents backward movement of the support during the retraction of the feeding pawl 190. Both pawls may be released by a cam-member 212 operated by a spring plunger 208. The feed of the support is controlled by a stop-bar 218, Fig. 7, engaging a projection 220 on the cam-disk 80. The feed is started by raising a hand-lever 236, which operates through adjustable connexions 228, 226, 224 to withdraw the stop bar and free the cam. The number of revolutions of the cam-disk, and consequently the number of rows in the block loaded with nails, is automaticallv controlled by a spring-pressed plate 242 which normally stands beneath the rod 228 and supports it at such a height that the cam-disk 80 is free to rotate. As the support 152 moves forwards, however, a pin 262 inserted in one of a series of holes 260 in one edge of the support trips the plate 242 from beneath the rod 228, whereupon a spring moves the stop-bar 218 into the path of the projection 220 on the cam-disk. If it is desired to deliver the nails points upwards the reverser is replaced by a similar device with the nail holes running right through it, and the gate 114 and reversing mechanism are dispensed with. Specification 5405/02, [Class 17, Boots &c.], also is referred to.