Patent GB-155360-A (GB)
Title: Improvements in or relating to heel-nailing machines
IPC: A43D79/00
Filed: 1919-09-12
Abstract: 155,360. British United Shoe Machinery Co., (United Shoe Machinery Corporation). Sept. 12, 1919. Heels, machines for.-Heel-attaching machines, particularly of the type described in Specifications 3314/91, 5084/03, and 2393/15, are provided with means controlled by movement of the heel-holder to prevent movement of the nail-loader to deliver a second load of nails until the holder has been moved to carry a new heel into attaching position, and with means to prevent the nail block from discharging a second load of nails to the loader until the loader has been moved to discharge its first load. Fig. 1 is a general view of a machine, the shoe to be heeled being mounted on a jack 6 adapted to be raised against a dieplate 4 by a screw and rack 26, 28 to measure the work, and then by eccentric cams to clamp the work while the nails are driven. The measuring operation is effected by a spring 42 which is elon. gated by connexions 50, 52 with a rod 54 adapted to be raised and then locked during the power operation of the machine; the rod 54 is connected by a triangular lever 30 and link 29 to the rack 28. When the starting treadle 70 is depressed, the rod 54 is released and the spring 42 then becomes operative-to raise the jack.; movement of the treadle is prevented however until the jack has been slid into operative position determined by an adjustable back gauge 80, during which movement a safety lever 74 is moved from beneath a locking-piece 76 on the treadle rod. The heel and top lift to be attached are positioned respectively in clamping-arms 7, 90, Figs. 1 and 5, of an oscillating holder, which is connected by an arm 92.. rod 94, and an adjustable link 96 to a two-part lever 98 pivoted.about a stud 100 depending from a bracket 102 and surrounded by an operating. spring 104. The front end of the lever 98 carries a pin 110 adapted to be engaged by a locking. lever 106, which is controlled from the right-hand side rod 12 in such a way as to be operated only as the rod is moved upwards. As soon as the locking-lever is raised, the forward end of the lever 98 is moved by a spring pin 112 relatively to its rear end to move the pin 110 rapidly out of the path of the locking-lever, and the spring 104 then swings the holder to carry the top lift clamp-, ing-arms 90 beneath the die-plate 4. The movement of the holder is cushioned by a dash-pot mechanism 122, 124, 126. The nail-loader 130, Figs. 3 and 5, is carried by an arm 132 which is pivoted about the side rod 12 and carries a block 136 notched to receive a locking-pin 138 operable through a flexible wire connexion 142, a spring- pressed rod 146, Fig. 8, a bell-crank 148, and a one-way tripping piece 150 adapted to be engaged by a plate 152 secured to the heel and top-lift holder. With this arrangement, the nail loader is locked in nail-receiving position by the pin 138 when the heel-holder is out of nailing position ; as the holder is swung to move first the top lift clamping-arms 90 and then the clamping-arms 7 beneath the die-plate 4, the plate 152 moves idly past the trip 150 and on its return is operative to withdraw the locking-pin 138, whereupon the nail-loader arm 132 is displaced from beneath the pin by a spring plunger carried at the lower end of a ratchet lever 156, Fig. 3. The nails are supplied to the nail-loader from a nail-block 172 which is held by spring pins 174 and a spring latch 176 in a carriage 168- bridged by a handle 170. This carriage is slipped into ways 166 in a frame 162 supported by rods 160 rising from the bracket 102, and is pushed backwards to the position shown in Fig. 3; during this movement a bottom cover plate 178 of the nail-block is stripped from it until its rear edge just covers a row of openings 182 leading to nail-guiding tubes 184. In the rearward position of the carriage, the points of the nails rest on a resilient plate 186, the forward end of which may be raised, when desired, by cams on a shaft operated from a finger piece 198; this finger-piece serves also to move the cover-plate 178 rearwards to cover the openings.182 to prevent discharge of the nails when the block 172 is moved forwards for removal. The carriage 168 is provided with a rack 202, Figs. 1, 3 and 5. with which co-operates a dog 206 pivoted to the ratchet lever 156, which is formed with a recess to receive a.locking-pin 232 adapted to be actuated through a flexible connexion 230, and a bell-crank lever 228 similar in construction to the bell-crank lever 148 from a slide bar 224. This bar carries a pin 222 arranged to be engaged by a cam 220 on the nailloader bar 132, the arrangement being such that the locking-pin 232 holds the ratchet lever 156 against movement until the nail-loader has been moved through a sufficient distance to discharge its nails to the die-plate. When the nail-loader is moved into nail-receiving position, it engages the lower end of the ratchet lever 156 and swings it so that the carriage 168 is advanced through one step by the rack 202 and dog 206 to bring the next row of nails into register with the openings 182. The carriage is prevented from overthrow by a friction block housed in a post 210, Fig. 3, and automatically rendered operative as the carriage is moved rearwards; when the carriage reaches the limit of its forward movement, the friction block is automatically retracted. The nailguiding tubes 184, Fig. 3, are mounted in a removable frame 240 fitting in a .guideway on the lower side of the frame 162 ; the arms of the frame are flanged to receive a removable foot plate 252, which receives the lower end of the tubes 184. The plate 252 is arranged to discharge the nails to the nail-loader 130, which is made in two sepa. rated sections for inspection purposes.