Patent GB-404640-A (GB)
Title: Improvements in or relating to fastener inserting machines for use in heel attachingand other operations
IPC: A43D79/00
Filed: 1932-07-14
Abstract: 404,640. Boot - making machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., Belgrave Road, Leicester.-(United Shoe Machinery Corporation ; 140, Federal Street, Boston, U.S.A.) July 14, 1932, No. 19883. [Classes 17 (i) and 89 (iii).] Heels, machines for.-Relates to machines for inserting fasteners into shoes, such as heel - attaching machines, wherein a device moves to transfer gangs of fasteners from a loading station to a shoe supporting member containing a group of fastener-receiving elements of which the pattern or spread is adjustable for different sizes of shoes, and consists in transfer mechanism adjustable, preferably automatically, to the adjustment of spread, so that alignment of each fastener holder and receiver is effected at each end of the travel without the necessity for changing of transfer parts. The loading device may have fastener holders which are spring pressed to the position of the holders at the loading station but are caused to yield to the spread of the holders in the jack before the fasteners are delivered. Alternatively, the holders in the jack, may be automatically brought into alignment with those in the loader, and, after fastener delivery, allowed to return to adjusted position. The jack may be of the general form described in Specification 186,126, [Class 17 (i), Boots and shoes, Apparatus for making &c.], with two breast tubes 18, two side tubes 20, and a rear tube 22, a screw 23 moving a cam plate to adjust simultaneously all but the rear tube. The surfaces of the upper ends of the tubes are inclined downwardly from front to rear of the jack, and the side tubes may have their top surfaces inclined downwardly and outwardly. The loader L may be traversed between nail receiving and delivering positions by the mechanism described in Specification 286,780, [Class 17 (i), Boots and Shoes, Apparatus for making &c.]. Its holder 38 has a slot 50 at its forward end in which is slidable a block 60 having vertical passages 66 for the breast nails, the block being urged forwardly of the slot by a spring 72. To retain the nails in the passages, a plate 76 guided to move to and from the passages and urged forwardly by a spring has shutter projections 74 and a lug 84 for moving the projections from under the nails. The passages 108 for the side nails are clamped to pins 114 each pivoted in a slide block 110 urged forwardly of the holder by a spring 112. The two holders are urged inwardly by a spring 130 but each provided with a contact arm 122 outstanding from a curved portion 124. A spring-pressed shutter 128 has a tripping step 132. The passage 96 for the rear nail is carried by a sliding block urged forwardly by a spring. Its shutter and tripping lug are similar to those on the side passages. In operation, the nail delivery passages at the loading station are arranged to correspond with the positions to which the passages in the loader are urged by their springs. As the loader reaches the jack, each shutter lug in turn contacts with the tube in the jack to which the nail is to be delivered, the shutter is opened releasing the nail, and thereafter, the unit may yield to allow other units to align with their tubes in the jack. In the case of the side units, the contact arms 122 swing the passages into position, with or without yield of the blocks carrying the side units. In a modification, the passages in the jack are shifted by the loader to the position of minimum spread before the tacks are released, the passages in the loader corresponding to this position. The cam plate 208 adjusting the spread is urged rearwardly by a spring 224 to a limit determined by an adjusting screw 226. As the loader reaches the jack, shoulders 230 contact with the cam plate and shift the passages to the position of minimum spread. As the loader recedes, the plate returns the passages to adjusted position. In another modification, the jack passages are shifted to the position of minimum spread by retraction of the nail driving plunger and allowed to return to adjusted position on retraction of the loader, the passages in which correspond to the position of minimum spread. The plunger 204 is resiliently connected to a lever 250 normally connected by a pawl 246 with a bell crank lever 237 carrying at one end a pin 238 actuating the cam plate and at the other end co-operating with an adjusting screw 236. On retraction of the loader, a latch 244 is tripped to release the pawl and allow a spring to return the lever 237 to adjusted position, the next descent of the plunger shifting the plate to the position of minimum spread.