Patent GB-190711883-A (GB)
Title: Improvement in Lasting Machines for Boots and Shoes.
Inventor: JUSTICE PHILIP MIDDLETON
Filed: 1907-05-22
Granted: 1908-08-20
Abstract: 11,883. Justice, P. M, [Manufacturers' Machine Co.]. May 22. Lasting; nailing.-Relates to lasting-machines of the type described in Specifications No. 4680, A.D. 1890, and No. 24,405, A.D. 1893. The pincer mechanism is hung from a pin 18, Fig. 11, in the front end of a forked up-draw lever 3, which is pivoted in an S-shaped carrier 105. The lever 3 is vertically oscillated from a cam 16 on the main shaft, the amount of oscillation being adjusted by an eye-bolt 5. The pin 18 supports a tubular guide 20, which is encircled by a boss 21 on a pincercarrier 22. This receives the lower detachable end 24 of a hanger rod 26, which is surrounded by an adjustable up-draw spring 28. The position of this rod, and consequently the pull of the pincers, may be varied as required while the machine is running, by mechanism coupled up with a kneelever. The lower end of the carrier 22 is bifurcated to receive the forked shank of the lower pincer jaws 34. The upper and movable pincer jaw 36 is mounted on a short link 37 jointed to the carrier 22, and its upper end is connected by links 39 to the slotted end of a rod 42. When this rod is lowered, a spring 43, which always tends to draw the movable jaw towards the left, Fig. 11, and the link 37, cause an approximate closing of the pincers. Afterwards, however, the rod 42 continues its downward movement, so that a wedge surface 44, which it carries, co-operates with rollers 45, 46 to jam the movable jaw down firmly on to the upper materials. To effect these two movements, the rod 42 is coupled up by adjustable link and bell crank connexions 48, 52, 54, 55, 61, Fig. 11, and a pair of short links 63, Fig. 8, with a lever 64 fulcrumed in the upper arm of a lever 66. These two levers are actuated respectively from cams 74, 77 on the main shaft. The cam 77 controls a spring 78, which actuates the lever 66 and, through the connexions described, lowers the rod 42 to effect the approximate closing of the pincers, during which movement the other cam 74 controls the lever 64 so as to hold a strong spring 69, Fig. 8, under compression. Later, however, the cam permits this spring to expand so as to give the rod 42 the final movement requisite to bring the wedge 44 into play. The whole movement of the pincers is thus spring-actuated, and the whole of the pincer-closing connexions are arranged within the up-draw lever 3 so that their action is a longitudinal and central one. After the up-draw movement, the pincers are moved to the left, Fig. 11, to effect the over-draw. For this purpose, the carrier 22 is engaged by an actuator 84, Figs. 3 and 11, fulcrumed in a yoke 86 and coupled up by adjustable connexions 88, 89, 91 to a lever 92 under the control of a strong coiled spring 94. The lever 91 is controlled by a cam 96 on the main shaft ; but, at the proper time, this cam permits the spring 94 to expand to effect the desired movement of the pincers. The machine is designed so that the tacker is moved toward and from the last, with and by the pincers. To overcome the inertia of all the moving parts of this part of the machine, so that the latter may be run at a high speed, the cam 96 is made as a closed cam for a short distance sufficient to set these parts in motion, the actuation then being transferred to the spring 94. The return movement is positive throughout, but a slight excess movement is allowed to ensure that the tacker shall be brought ioto proper position. In some cases, the pincers are given, while at work, a transverse movement to facilitate the feed of the work. For this purpose, the S - shaped carrier 105 is bolted to the yoke 86 of the actuator 84. A universal connexion 107<a>, 107<b>, Fig. 8, is provided between the levers 88, 89, to permit the actuator to partake of the swinging movement of the carrier 105 without interfering with the movement of the lever 89 to effect the over-draw. The carrier 105 is oscillated from a shaft 113, Fig. 8, driven from the main shaft, and the direction of its oscillation, whether to right or left of centre, and also its extent of movement, are controlled by slide blocks under the control of the operator. On each side of the pincer is mounted a pointed sole-rest 148, Fig. 19, which is actuated from the main shaft of the machine. These sole-rests partake of a vertically-reciprocating movement to engage and release the sole-channel ; this engagement is facilitated by also giving the rests a slight in-andout movement as they rise and fall. To assist in holding the work firmly, and also to resist the thrust of the sole-rests, an inverted frustoconical back gauge 167, Fig. 11, is provided. This rest is normally pressed forwards by a spring and a spring-controlled bell-crank, but it is also coupled up to the S-shaped carrier 105 so that it partakes of the movements of the latter and feeds the work whilst the upper is being pulled by the pincer, After the back gauge is pressed backwards against its spring by the operator in positioning the work it is automatically locked against further backward movement by a double pawl-and-ratchet device 186, 188,191, Figs. 8 and 11, under the control of the bellcrank 66. Simultaneously with this locking movement, a slide 201, Fig. 11, is moved forwards to lock the gauge 167 against rotation. The upper is then secured to the insole, and, preferably, tacks are supplied two at a time, one on each side of the pincers. The tacker carrier 203, Figs. 3, 11, and 74, is supported from the pivot stud 106 of the S-shaped carrier 105, and is made in two parts to form a channel for the driver-bar 204. This driverbar is raised by a cam 204<a>, and is forcibly depressed, to drive the tacks, by a spring-controlled arm 206 working through the side of the driver-bar, which is coup'ed-up by links to a second bar 213 carrying the drivers 216. These move up and down through a tack block 218 at the lower end of a pivoted V-shaped hanger 214, which is coupled-up by spring- controlled links to the pin through which the over-draw movement of the pincers is imparted. When the pincer-carrier is swung forward, it actuates these links to start the forward movement of the hanger 214 and its connected parts ; but, as soon as they are under way, a throw-out breaks these positive connections, and the remainder of the movement is entirely effected by a spring 229, Fig. 3. In its rearmost position, the tacker contacts with a face plate 248, Fig. 82, on a diagonal arm 249, Fig. 74, which is secured at its upper end to the carrier 203. This plate 248 is provided with two vertical slots 253, and a rearward and upwardlyinclined table 254, and behind it are arrangad, in turn, a separator 256, a separator support 257, and a gate 259, Fig. 82, for closing the raceways behind the separator, all slotted as shown. Tacks gravitate down raceways and through the gate and support to the separator, which then moves so that its inclined walls 260 act on the tacks and move them into a position ready to pass into the tack block. From this position, they are pushed into the tack block by swinging fingers 267, Fig. 73, which hold the tacks against the drivers 216 as they are rising, and yield to one side as the drivers descend. The fingers are spring-controlled, while the movement of the separator is also spring-controlled in both directions, to prevent breakage of parts should a tack get jammed. The manner of mounting the tacker allows it to move inward and outward relative to the last, and also to swing transversely for fullowing-up the side movement of the pincers whatever their position may be. Mechanism is also provided for swinging the tacker transversely to cause it to register with the raceways, and then to carry it to behind the pingers at one or the other side of the centre of the machine. This mechanism is hung from the S-carrier 105, and is also coupled up with the pincer-oscillating shaft 113, and it is so proportioned that white being flexible enough to follow the movements of the pincers, yet the tacker is always brought back to one invariable mid-position for receiving tacks from the raceways. The tacks are fed into the raceways, which are provided with hinged covers, from a tack pot, in which they are raised and dropped into the raceways by a rotating wheel driven by gearing from a short shaft, which is rotated by a belt from the main shaft. A rotary clearer brushes off misplaced tacks. To facilitate the introduction of the work between the pincers, a pair of deflectors 346, Fig. 3, are provided to bend the edges of the material into approximate alinement with the jaw opening. These deflectors are spring-controlled, and are moved towards and away from the work by mechanism operated from the starting-treadle. In addition, however, they are coupled-up to the lever which actuates the tack-moving fingers 267, so that they are withdrawn periodically from the work to permit it to be fed freely. The machine is provided with an ordinary starting and stopping clutch mechanism, and with a barke mechanism for bringing it to rest quickly. A roller, adapted to engage a gap in a ring carried by the main driving-pulley, ensures that the machine is stopped only at the end of one of its cyclic movements. In a modification, the pincer carrier 22 and the tacker are coupled together by an arrangement of links which automatically adjust themselves to the fulness or smallness of the upper, so that, whatever the amount of overdraw, the tacker is always in the proper position when the pincers open. The machine is adapted for use on both " McKay" boots and " welted work ; but, in the case of the former, the insole is preferably channelled to form a guide for the sole rests. When used on " welted" work, the tack block 218 is slotted in front of its driver passages, to permit the tacker to free itself when the tacks are only partly driven. Specifications No. 7026, A.D. 1892, and No 13,029, A.D. 1893, are referred to.