Patent GB-190914831-A (GB)
Title: Improvements in Lasting Machines.
IPC: A43D21/12
Filed: 1909-06-24
Granted: 1910-06-23
Abstract: 14,831. Pym, C. F., and Krentler Bros. Co. June 24. Lasting.-A lasting-machine for wiping ehverotupper at the toe or heel comprises essentially a pair of self - adjusting wiper plates, a pair of spreading-arms for opening the e upper and clamping it to the wipers, a. pair of curved fingers to engage the edge of the sole, a presser-foot, a last support, and power-operated d means for drawing a binder round the toe or heel. All the parts are actuated from a cam shaft 5, Fig. 3, which is driven by gearing from a main shaft 4. The wipers consist of curved plates 25, Fig. 15,pivoted to a centre plate 28, and mounted in guides in crossed levers 24 so as to be movable freely to seat themselves snugly round the work; springs 29 hold the wipers in their guides. The levers 24 are pivoted to the cylindrical end of a square post 23 carried by a bar 18, Fig. 3, which is slidably mounted d in a rocker 16. The rear ends of the levers are connected by pins and slots to a spring- controlled bar 34, which is normally positioned to hold the wipers closed. The rocker 16 also forms a guide and holder for a sliding- bar 45, the front end of which supports a spring- pressed post 49. This post carries a head 51, Fig. 26, which is formed with h bearings to receive stems 52, Fig. 29, of the e spreading or clamping arms 53. The stems 52 are formed w i t h fingers 54, which are adapted to be engaged by cam plates 56, Fig. 26, yieldingly secured to the post 23, to spread the arms 53 from their closed position in which they are normally held by springs 55. The fingers for engaging the edge of the sole consist of spring- pressed members 69, Fig. 26, pivotally carried by a head 68, Figs. 3 and 26, on a spring-pressed post 67, which is actuated by a rocking-arm 62 pivoted about the shaft 17 of the rocker 16. The head 68 engages under a shoulder 72 on the post 49, and lifts the clamping arms when the post 67 is raised. Lost motion is provided between the two devices, to enable the arms 53 to clamp the work against the wipers before the fingers engage the sole. The presser-foot consists of two serrated and relativelyadjustable members 77,81, Fig. 3, yieldingly carried in the front end of a frame 74, which receives a rocking movement about the shaft 17. The worksupport consists of an adjustable padded head 91 carried by a spring-pressed post 83, which passes through a frame 84 mounted so as to be adjustable lengthwise and rotatably in one end of a frame 85, which is also oscillated about the shaft 17. The means for automatically binding in the lasted upper consist of a head 102 formed with a grooved bill, into which the wire is led from a suitable tension device. This head is formed on a spring plunger housed in a bar 98, which is pivoted between ears 99 projecting from a stud passing through a bracket and carrying a pinion 96. At the proper time, this pinion is oscillated by a sector 107 actuated through the connexions shown from the cam shaft, to move the bar 98 round the work, the spring plunger forcing the wire-carrying bill against the underside of the wipers so that the wire will be properly positioned. The various parts of the machine, when inoperative, are arranged so as to give free access for positioning the shoe. When the machine is started, the clamping arms 53 are first opened to spread the upper, and then the fingers 69 are lowered on to the work. During their movement, the head 68 permits a spring 73 to lower the clamping-arms so that they clamp the edge of the upper upon the wipers. The fingers continue their downward movement to grip the edge of the sole firmly, and, simultaneously, the work-support is raised and the presser-foot lowered to secure the last and work firmly in the machine, These movements take place during one rotation of the shaft 4, which makes three revolutions to one of the cam shaft. The machine then comes to rest, to enable the operator to fasten the binder to a tack on one side of the shoe. During the second revolution of the shaft 4, the rocker 16 is actuated to raise the wipers and clamping-arms to stretch the upper, and, at the same time, the wipers commence to move forwards and close inwards for the wiping operation. When the wipers are on the point of moving over the sole, the fingers 69 are raised slightly, but not sufficiently to lift the clamping-arms 53. When the wiping-over operation is completed, however, the continued upward movement of the fingers 69 causes them to lift the arms 53 clear of the wipers, thus freeing the upper. During this part of the operation, the presser-foot is forced downwards to depress the work-support slightly, so as to leave room beneath the wiper for the binder to be drawn round the toe. The machine then stops again, and the operator secures the binder to a tack on the opposite side of the shoe. During the third revolution of the shaft 4, the wipers are opened, the clamping-arms closed, and the various parts of the machine are moved to their original positions, leaving the work free. When the machine is to be used for " turned work, some of the cams are exchanged for others which ensure that the wipers will remain open until, in their forward movement, they have cleared the edge of the sole. A modified arrangement of the lasting-devices is shown in Figs. 30, 32, and 34. The spreading means consist of members 126 pivoted to arms 124, which are pivotally secured to the shanks of independent rockers 123 mounted on a pivot pin projecting from a block 122 secured to the rocker 16. The members 126, which are thus capable of universal adjustment, are adapted to be opened, to spread the upper, by the engagement of a wedge 131, Figs. 32 and 34, with independently-adjustable latches 133 pivoted in the arms 124 ; the wedge 131 is actuated by a spring-controlled rod 134 secured to the bar 45 and passing through an ear on the side of the rocker 16. The extreme toe of the upper is clamped against the wipers by a finger 118<a>, Fig. 30, depending from a spring-pressed collar 118 on a rod 116, which is adjustably secured in the eye of a bolt 115 freely movable in the forward end of the rocking-arm 62. At the lower end of the rod 116, which is pressed against a stop 120 by a spring 121, is a collar 117 having a depending finger which engages the extreme end of the sole. A positioning-stop for the last is provided by pivotally securing a serrated footpiece to the presser-foot 77 ; the forward end of this foot engages the back of the lip of the insole. Fig. 40 shows a modified arrangement of the worksupport, in which a cam-ended lever 140 is connected by a turn-buckle 144 to the extended end of the actuating-arm 138, which is connected to the post 83 through the links 141, 142. At the end of its upward movement, the work-support is locked by the engagement of the cam-end of the lever 140 with the post 83. In a modified construction of wiring-mechanism, the pinion which is rotated by the oscillating sector is connected to the bill carrying the wire by a crank and a series of pivoted links so arranged that the bill is caused to travel in an elliptical path round the toe. A modified arrangement of the wiping-mechanism consists in providing the wipers with a detachable cover-plate, against which the upper is clamped by the spreading-arms 126 and the finger 118<a>. This plate, which may consist of two hinged parts relatively adjustable, does not move with the closing-in of the wipers, so that the upper is held spread throughout the whole lasting operation.