Patent GB-520378-A (GB)
Title: Improvements in or relating to machines for preparing welted boots or shoes for the application of outsoles
IPC: A43D44/00
Filed: 1938-09-21
Abstract: 520,378. Welt-butting &c. machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., (United Shoe Machinery Corporation). Sept. 21, 1938, No. 27488. [Class 17 (i)] Relates to machines of the kind described in Specifications 213,594, 236,141, [both in Class 17 (i)], and 437,607, for preparing welted shoes for the application of the outsole. So that the skiving cut at the ends of the welt may be as long as possible, the knife commences to cut from its extreme forward position. The last part of its movement toward the work has no forward component to prevent contact moving the work forwardly. The welt is supported and held at a predetermined elavation for inseam flattening by hydraulic locking means. A hold - down. positions the shoe heightwise. If a last-pin is used in the work support this latter is pivoted so that the positioned shoe may be moved rearwardly into engagement with the crease-finder. If no last-pin is used the last support has a corrugated upper surface to prevent slip. Shear members which co-operate with the welt-cutting knives are readily removable to facilitate replacement when worn. The. end portions of the inseam are forced inwardly before they are tacked to the insole. The tackers are caused to pound the inseam to flatten the same and work it inwardly. The tackers are adjustable lengthwise, and independently widthwise of the shoe. The shoe is ejected at the end of the operation. The work support is pivoted to arms 42, Figs. 2 and 4, of a carriage 44 having limited lateral swing about a lever 46 pivoted on a cross shaft 48. The forward movement of the support is limited by a slotted link 66 engaging a cross shaft 70 also pivotally carrying a lock which may be used to hold the support in operative position when a last-pin is not being used. The last-pin is urged upwardly by a spring 92 and guided by a sleeve 80 sliding in a post 36 itself slidably adjustable in a sleeve 34 pivoted to the arms 42. A pivoted arm 96 has a lug which engages a groove in the post to prevent turning. The shoe is pressed against the hold-down by a cam-actuated lever 136, Fig. 8, resiliently connected to the lever 46. For supporting the work during the pounding of the inseam, a cylinder 156 supported by the lever 46 contains liquid. and a fixed hollow piston 158 carrying a valve 160 maintained open by a lever 176 actuated by a cam roll 186 engaging a cam secured to an arm 143, a recess in the cam allowing the valve to close at the appropriate time, locking the work support against yield. Welt-cutting knives 208, Figs. 9 and 12, are secured in holders 210 each pivoted at 216 to a main slide 218. A camoperated slide 236 is transversely grooved to engage blocks secured to the main slides. Each main slide carries a secondary slide formed with a cam slot 252 housing a roll pivoted to the rear end of the knife holder, the secondary slide being frictionally actuated by the main slide and working between stops. A slide 274 carries teeth 288 geared, to slides 282 mounted in grooves in swinging arms 220 that carry the main slides: These slides have each a shoulder engaging a lug on the secondary slide 250, to move this rearwardly. This mechanism is so arranged that the knives are first moved forwardly, then forwardly and downwardly, and then downwardly into contact with the welt supported on the crease-finders. The knives are then dragged rearwardly'to perform their cutting stroke, and finally, raised to starting position, this being sufficiently'rearward to clear the tackers as they are swung inwardly. Pressers 302 lay the welt down flat on the crease plates. To scrape off wax and other matter which may adhere to the knives, wipers 312 move along the knives after the cutting operation. Each crease-finder 38, Fig. 15, has its shank secured in a slide 328 guided in ahead 330 removably mounted in a swinging bracket 332 at the forward end of a slide 454 mounted in an arm 452 journalled on a shaft 334. The arm is swung by a cam-actuated arm secured to rock-shafts carrying gear segments which swing shafts 366, 432, to which they are connected by universal joints ; a ball locks the slides to their carrying bracket after the slides are projected and before the arms are swung. Prior to the pounding of the inseam the crease-finders are retracted. Anvils 406 are secured to slides actuated by the rock-shafts 432. Adjustment of the head 330 lengthwise of the shoe is effected by an eccentric 462 on a pin secured in the arm 452 and engaging a slot in the arm 454. The tacker heads and creasefinder brackets are swung by a cam-actuated lever 492, Fig. 22. An arm 500 carries on each side gear segments 542 freely mounted on a shaft 494. A lever 502 is also free on this shaft, and is connected to the tacker head by a link 504. The arm and lever are connected by a right - and - left - hand screw which adjusts the heads towards and from each other. A lever 508 is geared to' the lever 502, and actuates the other tacking head. An extension 518 of the operating lever 492 is connected to the arm 500 by a resilient link 520. The extension 518 carries a spring-pressed pin 536 co-operating with an arm 532 to force the crease-finders firmly inwardly through the segments 542 and their pawls 548, these being pivoted to the arm 532. A peg 566 normally holds the pawls out of engagement, the peg being carried by an extension of the lever 492. A roller clutch inside a gear 578 meshing with a segment on the lever 502 prevents further inward movement of the tacker heads after the advance of the crease-finders, while these are retracted for the pounding and tacking operation. The gear is locked at the appropriate time by a cam-actuated lever. Each tacking and inseam pounding mechanism comprises two slides 608, Fig. 31, actuated by heavy springs 610 through levers 612. The springs are tensioned by a cam-actuated lever 646 linked to a slide 656. Normally, the tack drivers 700 are held up by latches 688 having an arm 692 co-operating with a lever 690 which releases the latch on downward movement of the slide 656, the outer end of the lever contacting a stop. A back stop 746, Fig. 2, is secured to a horizontal slide 748 urged forwardly by a spring. Its rearward movement is arrested by an arm 756 adjustable by a head 826. Pawls hold the back stop against movement during the cutting stroke ofthe knives, the pawls being released when the tacker heads and crease-finders swing away from the shoe. The back stop is finally advanced by a cam-actuated lever to eject the shoe.