Patent GB-567845-A (GB)
Title: Improvements in or relating to shoe upper conforming machines or to fastener-inserting arrangements suitable for use therein
IPC: A43D13/00
Filed: 1943-05-19
Abstract: 567,845. Lasting-machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., and ROBERTS, W. T. B. May 19, 1943, No. 7931. [Classes 17 (i) and 89 (iii)] Lasting; nailing.-A machine for conforming an end portion of a shoe upper to a last supported on a work support adapted to yield during at least part of period of operation of the wipers, has means automatically to lock such support against yielding movement during insertion of the fasteners, to ensure clenching of the tacks when the machine is operating on stout and harsh upper materials. The fastener inserting devices are shaken to assist in avoiding failure of any fastenings to enter the driver passages and means are provided to indicate visually to an operator if a fastener becomes wedged in its passage from separator to driver. The invention is described as applied to a machine of the kind described in Specifications 470,749, 482,275 and 489,649, comprising poweroperated wipers movable both heightwise of a shoe and inwardly of the shoe bottom, automatic means for spreading out upper material around the margin of the toe portion of the upper over the wipers and exercising a restraining action thereon as the wipers act on it, and tackinserting mechanism for driving a plurality of tacks through the wiped-over marginal parts of the upper. A pair of plates 3, Fig. 1, against the inner edges of which the tacker nozzles 1 of the machine described in the earlier Specifications are spring - urged, and which are advanced and closed similarly to the wipers by a pair of two-part levers 7, so that during driving of the tacks the tacker nozzles lie in contact with the inner edges of the wipers, are detachably carried on a table 5 connected to a camoperated lever. This table is rapidly reciprocated, to agitate the tacker nozzles and clear them of foreign matter, by engagement of a rearward projection 13 of link 7 attached to table 5 with a projection 17 from a collar 19 clamped on a transverse horizontal shaft 21 of the machine, and on which is a rocker arm 23, which is oscillated by engagement in its slotted end of a block 25 carried on an eccentric pin 37 on a shaft 29 which is driven from a main driving pulley of the machine through a friction disc 33. During tack driving, the projection 13 is moved forwardly out of engagement with the projection 17 and agitation of the tacker nozzles ceases. The work-supporting jack arrangement is of the kind described in Specification 470,749, modified as described in Specification 489,649, with a ratchet-wheel 39 and pawls 41 to hold the upwardly extending slidable jack post in raised position during operation of the machine in such manner as to allow the jack post to yield downwardly during the operation of the wipers. When tacks are being driven into the shoe bottom, the jack post is locked against yielding movement by engagement of a second ratchet-and-pawl device 67, 77 associated with the first mentioned device, but which functions after it, when movement of a cam-operated lever 93, produced by lowering of the spreading fingers of the earlier mechanism to permit the tacking nozzles to move into fastener driving position, causes one of a pair of pawls 77 to engage one of the teeth of the toothed sector 67. The pawls 77 are arranged so that one lies a distance equal to half the distance between the teeth on sector 67 in advance of the other. Electric lamps are arranged in the vicinity of the working locality of the machine in parallel circuit, the circuit of each lamp being completed through connections to the separator slides and the actuating members of tack separating and feeding devices for supplying tacks to the tacker nozzles, to indicate visually to a machine operator, by opening the circuit of a lamp, if a fastening becomes wedged in the movable means for delivering the separated fastener to a fastener driver passage. The lamp affected indicates the locality of likely trouble.