Patent GB-1047991-A (GB)
Title: Improvements in or relating to fastener-inserting machines
Inventor: WILLBOND WILLIAM FRANK
IPC: A43D69/04
Filed: 1962-05-24
Abstract: 1,047,991. Nailing. BRITISH UNITED SHOE MACHINERY CO. Ltd. May 22, 1963 [May 24, 19621, No. 19947/62. Heading B4C. A nailing machine, such as for securing soles to shoes, comprises means 250, 270, Fig. 8, for severing the nails from a reel of wire 192 by shearing the wire obliquely of its axis and means 294, 296, Fig. 15 (not shown), for operating on the leading end of the stock to turn the point left by the shearing operation on to the axis of the wire before severing the next fastener therefrom. The shearing means are mounted in an operating head 26, Fig. 1 (not shown), and include a vertically reciprocable jaw 250 having an inclined shearing face 266 and a co-operating jaw having a corresponding inclined shearing face 268 and arranged to be pivotally movable in a horizontal plane. The jaw 250 is connected to an arm 254 having a shoulder 259 adapted to be acted upon by a cam surface 264 on a slide member 260, the slide being reciprocated by a pin 262 on the slide engaging with a cam slot 238 formed in a bar 190. The jaw 270 is secured to a lever 274 which is pivoted on a bolt 272, the lever being given a rocking movement during movement of the bar 190 by means of a cam surface on the latter engaging with a hardened block 277, Fig. 12 (not shown), secured to the lever. The operating head also includes a wire-feeding device comprising a feed block 204, Fig. 8, slidable in a guideway 205, the block being reciprocated by means of a lever 210 having an end 212 engaging with the block and its other end pivoted on a pin 214 attached to a plate 216, Fig. 11 (not shown). The lever is given a rooking movement via a cam surface 234 on a slide 232 engaging with a lug 230 on the lever, the slide being reciprocated by a pin 236 thereon co-operating with the cam slot 238 in the bar 190. The stroke of the lever 210 is varied by adjusting the position of the pivot-pin 214 via a handle 222 secured to a shaft 218 carrying the plate 216, the handle being locked in the adjusted position by means of a spring-urged pawl 227 engaging in teeth formed in a graduated member 226. A driver 310 is connected to an arm 320 bolted to the top end of the bar 190, the driver having a driving pin 312, Fig. 18 (not shown), adapted to contact the top of the nail. A work support member 28, Fig. 5 (not shown), is provided with a spindle 100 mounted in a slidable sleeve 104 moved up and down by means of links 139, each connected at one end, to a collar 136 and, at their other ends, to a bar 140, the centre of the links being pivoted on an adjustable collar 156. A rod 146, connected at its upper end to the bar 190, slidably passes through the bar 140 and a second bar 144 the two bars being coupled together by tension springs 148. The work support is connected with the sleeve 104 by means of spring-loaded pawls engaging with teeth 102 formed in the spindle 100; the work support may be initially positioned manually by releasing the spring-loaded pawls via a depressible plunger. The drive for the machine comprises an electric motor 54, Fig. 2 (not shown), coupled by a belt 52 to a pulley 42 freely rotatable on a crank-shaft 32, the latter being connected to the pulley for rotation therewith by means of a pawl-and-ratchet device 40, 46, Fig. 3 (not shown). In operation, by depressing a foot pedal 80, a cam 48 is moved out of contact with the pawl 40 thereby allowing the latter to engage the ratchet and so rotate the crank-shaft. Rotation of the crankshaft via a rod 36, pulls the bar 190 downwardly, thereby lifting the work holder so that a shoe positioned thereon is pressed into contact with the bottom face of the jaw 270. Movement of the bar also causes the jaw 250 to move downwardly so that the end of the wire W, obliquely cut during the previous operation of the machine, is forced into contact with a groove 296, Fig. 17 (not shown), in an anvil 294 thereby bending the point on to the axis of the wire. Continued downward movement of the bar causes the feed block 204 to feed a length of wire into a bore 286 in the shear block 270, the latter then being rocked by the lever 274 so as to shear a short piece of wire forming the nail and be brought into a position in which the bore 286 is aligned with the drivepin 312. During the final part of the downward movement of the bar 190, the drive pin forces the nail into the sole of the shoe; the depth of penetration of the nail is varied by means of an adjustable stop-pin 326, Fig. 8, the height of which may be controlled by screw-and-nut device, Fig. 19 (not shown. The pressure applied by the work-holder to the shoe against the jaw 270 is controlled by a spring device 158, the tension of the spring being adjustable by means of a gear-and-pinion arrangement 170, 172.