Patent GB-324682-A (GB)
Title: Improvements in or relating to machines for inserting fastenings or the like
IPC: A43D69/04
Filed: 1928-08-01
Abstract: 324,682. British United Shoe Machinery Co., Ltd., (United Shoe Machinery Corporation). Aug. 1, 1928. Pegging; slugging.-A fastener-inserting machine is provided with means for supplying automatically a fastener of an exact length in accordance with a measurement of the thickness of a work-piece made by a part of the machine. The machine is particularly for use with the paper twine fastener stock described in Specification 253,117, the penetrating movements of an awl controlling the length of fastener stock fed to the inserting instrumentalities. In one form of machine, Figs. 1, 2, and 5, a cam shaft 30 is driven by a belt 37 under control of a clutch and' brake element 38 and a treadle rod 54. A driver bar 60 carrying a driver 62 is reciprocated by a lever 68 and cam slot 72. An awl bar carrier 80, Fig. 2, is reciprocated horizontally, for work feeding, by a lever 100 and cam disc 102, and has guides for an awl bar 82 carrying an awl 84. The awl bar is reciprocated vertically by a gear segment 88 on a lever 90 formed with two rearwardly extending arms 94, 96. The arm 96 is connected to the operating cam lever 104, Fig. 1, through the intermediary of a link 120 which includes a stiff spring 112 and which is adjustably secured to the lever 104 by means of a nut 128 and a graduated slot 126. The spring connection allows the cam lever 104 to complete its stroke even if the awl is arrested, for example by the steel plate 110 of the last 18, before the said stroke has been completed, and the adjustable connection allows the normal full stroke of the awl to be varied. The fastener stock 140 is fed by a feed dog 146, Fig. 2, and is held from retrograde movement by a dog 148. It passes through a passage-way 150 to a throat 152 which is reciprocated by a bar 154, toothed segment 158, and cam levers 160 to cut off a fastener length and move it below the driver. The feed dog 146 is carried by a tubular member 176 which is reciprocated lengthwise of the fastener stock to feed it to an extent controlled by the penetrating movements of the awl. The member 176 is connected to a block 179 mounted in slideways at the end of a lever 180, Fig. 5, which is fulcrummed at 182 and pivoted to a link 186. The latter is pivoted midway of its length to a link 188 which is adjustably pivoted at 190 to a cam lever 192. The rear end of the link 186 is pivoted to a block 207 slidable in a guide slot 200 formed in a lever 202 which has a forwardly extending arm formed with a gear segment 206 in mesh with a gear segment 208 formed on the arm 94 of the lever 90. Thus, the lever 202 is rocked, as the lever 90 moves, through an angle which is determined by the extent of the downward movement of the awl. This rocking changes the relative positions of the links and levers connecting the cam lever 192 with the feeding member 176, and hence the length of fastener stock fed to the throat member 152 is varied in accordance with the movements of the awl. The adjustable connection 190 allows of an initial setting of the normal feed stroke. In another form of machine, Fig. 7, the fastener forming and inserting mechanism is carried by an arm 220 mounted to swing in vertical and horizontal planes on a standard 222 and counterbalanced by a weight W. At the rear of the arm 220 is a motor 226 driving a cam wheel 228 formed with two cam paths 229, 230 for operating two rods 238, 240. The rod 238 operates a bell-crank lever 242 which controls the feeding and fastener-forming mechanism, and the rod 240 operates a bell-crank 244 which controls a rod 260 carrying a tool 30 serving both as awl and driver. The bell-cranks 242, 244 are pivoted on a bracket 250 from which depends a tube 252 carrying a housing 254 with a hand-grip 298. A sleeve 256 pivoted to the bell-crank 242 is slidable within the tube 252 and surrounds the rod 200. A collar 262 secured to the rod 260 carries a latch member 264 normally urged by a spring 266 so that a shoulder on it engages a shoulder on a second latch member 272 carried by a sleeve 276 slidable on the rod 260 and pivoted to the bellcrank 244 at 278. The latch 264 is normally held to disengage the latch 272 by means of an arm 280 and a latch 282 and stiff wire 290. Hence, when the motor 226 is running, the sleeve 276 is merely reciprocated idly on the rod 260 by the bell-crank 244. To engage the latches 264, 272, and so cause the sleeve 276 to drive the rod 260, the latch 282 is released by a trigger device 294 on the hand grip 298. When the latches are so engaged, the rod 260 moves downwardly and the tool 304 first acts as an awl to penetrate the work until it is arrested by the work support, for example the steel plate of a last. When so arrested, the latches 264, 272 can tilt about their pivots against a spring 312, allowing their shoulders to disengage and the bell-crank 244 to complete its working stroke. Thus, the extent of the downward movement of the awl is dependent upon the thickness of the work-piece. The fastener stock 225 passes through a guide 324 secured to the sleeve 256 and is held to it by a feeding dog 328 on a bell-crank lever 330 pivoted to the guide. The upper arm of the bell-crank has a projection 336 which can be moved by a spring 334 into a vertical groove 338 in the rod 260 just before the completion of the downward stroke of the rod. While the tool 304 is in work-penetrating position, the sleeve 256 is moved downwardly by the bellcrank 242. The fastener stock is fed until the projection 336 strikes the lower end of the slot 338, so that the extent of the feed depends upon the position of the slot, that is, upon the thickness of the work-piece. Retrograde movement of the fastener stock is prevented by a dog 340. The fastener stock is fed into a passage-way 362 in a rocking lever 356 which is provided with a second passage-way 364 normally aligned with the tool 304 to permit its descent as an awl. The guide 324 is arranged to depress a spring-pressed rod 372 to rock the lever 356 to sever a fastener length and bring it below the tool 304 for its driving stroke. Specifications 130,616 and 278,404 are referred to in the Provisional Specifications.