Patent GB-482666-A (GB)
Title: Improvements in or relating to machines for lasting veldtschoen
IPC: A43D113/00
Filed: 1936-10-03
Abstract: 482,666. Lasting-machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., RICKS, F., BOOTHROYD, H., and JAMES, C. H. Oct. 3, 1936, No. 26830. [Classes 17 (i) and 89 (iii)] Relates to machines of the kind described in Specification 467,669, wherein a machine for lasting Veldtschoen embodies a treadle-operated arrangement of three grippers for tensioning the toe portion of an upper heightwise and lengthwise of the shoe, and holding it in outspread relation while wipers of the machine are moved, by power, downwardly around the toe of the shoe to shape the upper to the last and press the margin of the upper to the margin of the sole. The shoe is positively located in the machine by a toe end gauge and a heel end support ; the grippers are power operated ; the machine comes to rest before the wipers are actuated, to enable the operator to adjust the upper, or to release it and start the operation again. The pull of the grippers is relieved to allow the wipers to bed the upper well into the crease, a shoe-support for the sole margin rising to force the margins of sole and upper together. Notches in the wipers allow the insertion of fasteners, the notch at the toe end being provided by retraction of a narrow auxiliary wiper at this portion. Three grippers are provided, one, 13, at the toe end, and one, 15, at each side of the toe portion. Each gripper comprises wide upper and lower jaws pivoted at 21 to a plate 23 itself pivoted to a shoe fore-part support 11. The lower jaw is supported by a spring plunger 29, and the plate 23 by a spring plunger 39. The tail 35 of each upper jaw co-operates with a roll 18 engaging a surface 22 on the plate and carried on a link 20 actuated by slides 113 for the side grippers and a slide 81 for the toe gripper. Normally, the rolls 18 engage recesses 24 adjacent to the pivots 21. In the case of the side grippers, their plates 23 have slotted engagement with their pivots 59, so that there is less outward pull than there is forward pull in the case of the toe end gripper. The pivots for the plates 23 of the side grippers are carried by arms 57 secured to rods 55 converging towards the toe and adjustable for size of shoe. Teeth on racks 77 engage screws 75 for holding the grippers in adjusted position, spring plungers 71 maintaining the points of the screws in engagement with the racks. The slides 113 for the side grippers are connected by an equalizing lever, which, at the usual machine stop with the grippers under tension can be tipped by a hand lever for shifting the upper transversely, or depressed for increasing the pull of both grippers. A second hand lever is provided for increasing or decreasing the pull of the toe end gripper. The toe gripper closes before the side grippers, the slide 81 having pivoted thereon an arm 8.7 formed with a cam surface 89 co-operating with a roll 100 on an arm 91 rocked clockwise when the gripper .controlling treadle 80 is repressed. As the arm 87 is swung rearwardly, an arm 101 pivoted thereto releases a latch 95 and allows a spring 167 to depress the slide. When the machine is started, a cam-operated slide 111 depresses a slide 123 connected, by the equalizing lever mentioned, to the slides actuating the side grippers, and also further depresses the slide 81, both slides 81 and 123 being resiliently connected to the slide 111 by the springs 167. The upper end of the slide 81 supports the spring 43 of the plunger 39 on which the plate 23 of the toe gripper rests, descent of the slide thus relieving the pressure of the spring against the plate. The slides are retained, in the position to which they have been moved, by pawls which may be freed by a lever 235. Depression of the treadle 80 lifts a rod 253 carrying a roll 257 actuating a finger 259 swinging the arm 91 clockwise. The rod also carries a block 275 co-operating with a pin 277 on a latching lever 279 normally supporting a clutch tripping lever 281 carrying a roll 309 normally engaging the tail. of a pawl 305. When the tail is released the pawl connects a constantly driven ratchet wheel 299 with a sleeve carrying the pawl and rotating with a pinion 315 driving the cam-shaft 151 of the machine. The treadle is held depressed by a latch 319 which may be released by a pedal 329. The latching lever 279 depends from a lever 285 cam-actuated to free the clutch and stop the cam-shaft at one-fifth and again at three-fifths of its revolution, the first stop being while the grippers are exercising their pulling and spreading action on the upper. Heated wipers are used, and their normal position is above and well back from the shoe. A wiper head 341 rises and falls in a guide-way 339, this movement being imparted by a camoperated link connected to the head by an angularly adjustable eccentric bush 345. The head is formed with a guide-way 353 in which a wiper-enclosing box 357 moves longitudinally of the shoe. The box contains a pair of sidewipers 361 and an auxiliary wiping member 365 between them. The outer edges of the side-wiper holders engage curved guide-ways, and the holders are each provided with a roll 375 engaging a slot in a slide 373 for opening and closing the wipers, as usual. The wiper head is advanced toward the shoe by a treadle, at the side of the treadle 80, connected by links and levers and a spring 397 to a lever 393 engaging a groove in the wiper carrying slide 355. The forward motion so produced is arrested by a roll 403 engaging a flange 401 on the slide. Normally, the wipers are held closed by springs 405, but, in the advance of the head, lugs 407 on th'eslides 373 contact with a roll 411, adjustable forwardly and rearwardly of the machine by a hand wheel 431. Spaced forwardly of the projection 401 is a projection 433 which is engaged by the roll 403 when the upper head has reached its forward position and is then lowered to cause the wipers to wipe the toe end of the upper towards the sole. A flange 435 similarly co-operates with each flange 407 and the roll 411. When the wipers have reached their lowest position, the rolls 403, 411 are moved forwardly by cam-actuated mechanism, the latter roll advancing faster than the other so that the wipers are closed as they advance. The wiper controlling treadle is linked to a rod at the side of the rod 253, which is provided, like the rod 253, with a V-shaped block co-operating with the pin 277 to release the clutch tripping lever to impart a further partial rotation to the cam-shaft. This second partial rotation draws the wipers down by power and, later, advances and closes them. The treadle has a latch device similar to that on the gripper-controlling treadle, the pedal 329 being arranged to release both treadles. Means are provided to prevent the wipercontrolling treadle being depressed sufficiently to cause engagement of the clutch unless the gripper-controlling treadle 80 is fully depressed and latched. A toe gauge is provided, comprising a pair of outwardly and forwardly extending arms 491 secured to opposite sides of an arm 493 pivoted to the frame and connected by a link 497 to a spring 501 normally retaining the gauge in out-of-the-way position. The link is slotted to engage a roll on a slide 503 carrying a roll 505 at its upper end engaging the arm 493 and connected with the arm 91, which is swung by depression of the treadle 80. The gauge is retracted before the wipers ad-. vance. A heel-end abutment is supported by a slide 531, urged rearwardly by a chain 563 and weight 569. The slide carries an arm 543, universally mounted and urged forwardly by a spring plunger 545. A tooth on the arm engages a rack 551, to maintain the lateral adjustment. The arm carries an adjustable fork 555. The fork is moved rearwardly to assist the toe gauge to hold the shoe against displacement under the pull of the grippers. A double-ended pawl 571 engages teeth on the slide 531 and carries a pin 577 engaging a notch in a link 581 actuated to rock the pawl by connections to the gripper controlling treadle and cam-shaft. To enable the wipers to tuck the upper well into the angle between the last and sole to form a well-defined crease, the sole support comprises a central portion 603 and a surrounding portion 605 normally below the portion 603. Near the toe-ward end the portion 605 has a recess engaged by a plunger 617 for pressing the margins of the sole and upper together when the wipers have reached their fully advanced position. The plunger is actuated by the cam-shaft. The auxiliary wiper blade is retracted, to enable a staple to be driven in the notch formed by this retraction, by a pin on an arm 643, the pin engaging a slot in the carrier for the blade and the arm moving with an arm carrying a pin 657 struck by the end of an arm 663 moved simultaneously with the rising of the plunger 617. To ensure that the wipers are closed when they are retracted, the springs 405 are supplemented by levers 675, each linked to a pin 681 secured to the wiper head, slots 683 allowing the lost motion necessary to the advance of the wipers. The tension of the grippers is relaxed as the wipers reach their lowermost position by contact of the wipers with fingers 693, each mounted on the pivot 21 and abutting against a pin 691 to depress the plate 23 and relieve the grip of the jaws on the upper by reducing the jamming effect of the rolls 18. Simultaneously, the tension of the toe gripper is relieved by the rising of the slide 81, a pawl 711 actuated by the cam-shaft engaging teeth carried by the slide. The grippers are completely released by rise of the slide 111 prior to the final advance of the wipers. Means are provided for cutting out the second stop, to bring the machine parts to starting position, if the pulling-over is to be repeated. In operation, the work piece is positioned, and the treadle 80 partially depressed. The upper jaw of the toe-end gripper descends to close the jaws on the upper margin, and the toe-end gauge rises and