GB460023A - Improvements in or relating to boot or shoe lasting machines - Google Patents

Abstract

460,023. Boot - making machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., PRATT, J. W., and LANE, H. July 19, 1935, No. 20553. Addition to 340,310. [Class 17 (i)] Lasting.-Relates to heel seat lasting machines of the kind described in Specification 391,451, and consists in improvements in the mechanism described in Specifications 340,310 and 416,871 for clamping the upper materials against the opposite sides of the last just toe-ward of the heel seat before the heel band and wipers act on the upper, and holding these materials in their correct positions during the lasting operation. The clamping pads are moved into contact with the shoe by depression of a treadle, and are automatically pressed more firmly against the shoe by power, as described in the latest prior Specification. Means are provided to ensure that the power pressure is substantially the same for successive shoes independent of the length of travel of the pads produced by the treadle. Also, the pads are coupled to the heel-band so that adjustment of the heel-band for width of shoe produces corresponding adjustment of the pads. The bell-crank levers 7, described in the latest of the prior Specifications as actuated by links 35 from a lever 39, swung by a cam-operated link 41 over which is threaded a strong spring 51 and a weak spring 53 forming yielding means between the lever and clamping pads, are provided with dove-tail grooves 9 in which slide brackets supporting the posts carrying the pads. These brackets are each held in adjusted position by a plunger 17 formed with teeth engaging teeth on the bracket. The plunger is grooved to engage the end of a lever 19 co-operating with a spring 23 normally holding the plunger in operative position. Each bracket supports a post carrying at its upper end a shoe-engaging pad 31 similar to those described in the latest of the prior Specifications. The forward ends of the heel band 1 are connected to levers 54, similar to those described in Specification 391,451, coupled by links 55 with levers 57 automatically swung inwards to close the heel band about the shoe. The links 55 are connected to the levers 54 by vertical pins 63 which depend downwardly to engage faces on the levers 7, which are, normally, urged outwardly by the light spring 53. The pads, therefore, follow the adjustment of the heel band. To facilitate this adjustment, the links 55 are in two parts, one being screwthreaded to engage a nut formed with teeth 69 on its periphery and held against side-ways movement in the main portion of the link. A second pinion beneath the pinion 69 is rotated by a knurled head 79. The treadleoperated lever described in the latest prior Specification as actuating the lever 39 for approaching the pads to the shoe is connected to this lever by a pin 103, and is normally free from the treadle, depression of the treadle freeing a pawl connecting these parts. This construction prevents the prior adjustment for width of shoe from varying the final pressure applied to the shoe by the pads, or the time in the cycle at which it is applied. A similar device is inserted in the link 41, for the same purpose.