Patent GB-191311463-A (GB)
Title: Improvements in or relating to Pulling-over or Pulling-over and Lasting Machines.
Inventor: WADE HAROLD
IPC: A43D13/00
Filed: 1913-05-16
Granted: 1914-07-16
Abstract: 11,463. Wade, H., [United Shoe Machinery Co.]. May 16. Lasting.-Relates to pulling-over or pulling-over and lasting machines of the type described in Specifications 7005/00 and 12,304/03, and in Specification 9793/08, respectively, as distinguished from lasting-machines which work progressively around the shoe, as described in Specification 14,453/97 ; and consists in detail improvements in the shoeengaging, upper-tensioning, overlaying, and securing mechanisms to adapt these machines to fulfil present requirements. For conforming and securing the toe portion of the upper to the last, each side tack arm 8 carries an attachment 10, Fig. 2, which is loosely connected at its upper end to the arm by a spring-pressed ball-headed pin 11, Fig. 3, located in a slot 12, and at its lower end by a ballheaded rod 14 ; this rod is surrounded by a spring 151, which tilts the lower end of the attachment inwards. The attachment moves inwards with the automatically-moving side tack arm 8, and rides over the edge of the shoe until stopped by an abutment 17, with the result that the inner edge of the attachment, or a wiper plate 16 which it carries, tips downwards and compresses the upper down on the feather of the insole. In this position, the attachment can be manipulated by a handle 15, Fig. 2, so that the wiper, which extends toward the middle of the toe, may work the upper into the angle of the insole. The usual tack-driver is omitted from the front arm of the machine, and in its place two tack tubes 20 from the multiple tack-supplying apparatus are diverted to the attachments 10, each of which contains a swinging tack-delivery tube 22, Fig. 3, and a spring-pressed tack-driver bar 25 adapted to be operated from a hand-lever 34, Fig. 2. At one side of the machine, the attachment carries a holder 40, Fig. 3<a>, for the looped end of a binding- wire, which is led through a guide 41, Fig. 2, in an arm 42 connected to a plate 45 on the lower end of the front arm. The wire passes under a tension lever 46 to a reel 48 carried by the arm 42, which can be moved by means of a handle 50 for placing the wire around the shoe under the wipers 16. The loop of wire is stripped from the holder 40 by a spring-pressed blade 39, Fig. 3<a>, which is lowered by the descending driver-bar 25 to a level slightly beyond the tack-driving face of the driver. In a modified construction, the wiper plates 16 are carried by the usual side clamp-carrying arms, instead of being mounted on the attachments 10 ; each is pressed forwards yieldingly, and can turn angularly about an horizontal axis extending across the last and located near the rear end of the wiper, and about a vertical axis also located near the rear end of the wiper. In a modified arrangement of this last construction, each wiper plate is mounted on a slide located in the side clamp and connected to a hand-lever by means of which the wiper can be moved longitudinally of the last ; a second band-lever located adjacent to the first is connected by a rod to a projection at the back of the wiper for turning this about its pivot. Fig. 6 shows an improved gripper for use in place of the toe-gripper described in Specification 12,304/03. It comprises three pairs of gripper jaws, a central pair 102, 103, and two corner pairs 104, 105. Each pair of jaws is provided with a separate tension spring 124, which can be adjusted so that the pulling-force of the several pairs of grippers may be independently regulated. With the exception of the multiplicity of parts, the means for closing, raising, and tripping the grippers are substantially the same as those described in Specification 12,304/03, but if the springs of the corner jaws are under less tension than that of the toe, the upper may slip between the corner jaws after being lightly pulled, and while the upper is being held and more strongly pulled by the centre jaws. Fig. 7 illustrates another construction of multiplegripper mechanism in which there are two pairs of grippers 224, 225 engaging the upper at each corner of the toe ; they are adapted to be moved outwards as well as forwards to spread the upper widthwise across the top of the toe end of the last. These corner grippers, which may be constructed as described in Specification 12,304/03, are carried by operating-bars 128, which are suspended from the opposite ends of an equalizing-lever pivoted at 222 to the usual arm 217. This arm is yieldingly lifted up by the usual cam-actuated lever 220, from the front end of which is suspended a link 230 having roll studs 231 which slide in inclined slots 232 in a bracket 235 ; a stiff adjustable spring 234 tends to pull this bracket to the front of a machine to a position determined by a stop 233 in a holder 240. The lower end of the link 230 pivotally carries two struts 236, which engage guides 238 in the bars 128 and force the bars and corner grippers outwards away from the corners of the last during the updraw. Additional outdraw may be effected by moving the holder 240 by means of a rack and pinion 242 actuated by a hand-lever 245 ; provision is also made for positioning the corner grippers laterally, either initially, or while the upper is held. After the upper has been stretched by the grippers, it may be worked over the last by wipers 260, in the known manner. To assist in this, a treadlemechanism is provided to trip a connexion from the operating-cam to the lever 220 to permit both the updraw and outdraw to be relaxed as the wipers are raised toward the edge of the shoe bottom. A connexion 282 from the same treadle is also adapted to actuate through a rack and pinion a slide frame 286, 287 carrying a pivoted yoke 288, which is adapted, at the proper time, to trip the corner grippers. In another construction of multiple toe-gripper, Fig. 11, a forward movement is given to the upper before there is substantially any updraw. The toe-gripper is of the curved sectional type, and its suspension bar 360 is formed with a head 362 held by a plate 363 in a recess in the updraw lever 126 ; a spring 364 serves to press the bar down. A cam block 365 for operating a gripper-spreading bar 366, which forms part of the spreading-mechanism described in Specification 12,304/03, is slidingly mounted on the bar 360, and is connected by a bolt 369 to an adjustable unyielding rod 368 connected to the lever 126. As this lever is raised, and after the grippers have been closed, the cam-block 365 is drawn upwards on the stationary rod 360 to effect a forward movement of the grippers before the rod 360 is moved to start the updraw. A hand-lever 370 is provided for effecting additional foredraw during the usual period of rest of the machine, or for moving the grippers round the toe of the last to straighten the tip. The side grippers are arranged so that they grasp the upper with a light grip to enable the upper to slip through them during an initial upperpulling movement, but afterwards the grip is increased,and the upperis stretched to a predetermined amount. Each of the side grippers, which are positioned in upper-gripping position by adjustable wedge-shaped abutments 353, Fig. 14, is furnished with a light jaw-closing spring 355, which is of sufficient strength only to cause the upper to be straightened as the usual updraw levers 126, 131, Fig. 13, are raised, but after the jaws have risen through a predetermined amount, the rise of the jaws is checked by the contact of stop-nuts 391, Fig. 14, with the foot of a rod 390 connected to a spring-pressed piston 384. Fig. 13, in a pneumatic cylinder 386. This causes the jaws to bite strongly into the upper, and the final stretching by the usual updraw springs 314 occurs slowly and without shock. Stops 395 are carried by the updraw levers 126, 131 and adjustably limit the amount of updraw. Treadle-connexions are provided for lifting the side grippers by an additional amount, if necessary, after the initial pull; the treadles are arranged adjacent to each other for separate or simultaneous manipulation. Another means for causing the last to be bedded properly in the upper consists in providing the sole rest with a forward foot 413, Fig. 16, and laterally-extending feet 414, and to give it a number of transverse rocking movements while the upper is held by the grippers, These feet are mounted on a spring-pressed rack slide 415 dovetailed in a carrier 416 and movable longitudinally of the shoe by a spherical pinion 418 mounted on a shaft 420 ; the carrier 416 has a yielding pivotal movement about this shaft by means of a cam 405 on the main shaft, and receives a transverse rocking-movement from the same cam through a fork 419. The sole rest moves the last and shoe backwards relatively to the grippers to effect the foredraw, and to enable this properly to be effected, the heel rest is advanced into engagement with the shoe after the backward movement of the sole rest. The rack mechanism controlling the heel rest is the same as that described in Specification 12,304/03, but the usual rack slide 446, Figs. 16 and 19, is, according to the present invention, connected by a lateral arm 448 to the pistonrod of a plunger 450 working in a cylinder 452. The plunger is engaged by a pivoted latch 455, which normally holds the heel rest 440 retracted. The latch is adapted to be tripped by a camactuated block 435, in which the rack slide 446 is mounted, as this block reaches the end of its rearward movement, during which movement the sole rest is actuated ; the latch is furnished with a handlever 458 for manual manipulation of the heel rest, if desired. The cam-block 405 for actuating the sole rest is shaped so that, after the side clamps have closed inwards, the last is forced downwards to bring the face of the insole level with the top faces of the usual friction pads 462, Fig. 17, and after the tacks have been inserted, the cam depresses the last still further for the tackers to back off the shoe