Patent GB-416871-A (GB)
Title: Improvements in or relating to boot or shoe lasting machines
IPC: A43D21/12
Filed: 1933-03-24
Abstract: 416,871. Boot-making machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., ROBERTS, W. T. B., LANE, H., and DYSON, H. H., Belgrave Road, Leicester. March 24, 1933, Nos. 8912 and 33413. Addition to 340,310. [Class 17 (i).] Lasting.-The machine described in the parent Specification, having power operated heel seat lasting wipers, an upper conforming heel band, a gang of fastener-inserting devices adapted to insert into a shoe on a last support of the machine and auxiliary means engaging the upper somewhat toeward of the heel seat to prevent the formation of pleats in this position, is modified by mounting the auxiliary means independently of the last support, providing means to urge them automatically by power into operative position after the last support has received its shoe presenting movement but prior to any substantial clamping action of the heel band on the upper, coupling them by a pressure equalizing device to last side-supports of the kind described in Specification 391,451, and providing manual means for moving them to operative position before the machine is started, the power means causing them to engage the upper more firmly during the lasting operation. The cam operated lever 49, described in the later prior Specification, for moving the last side supports is connected by an equalizing lever 47 and links to a pair of bellcrank levers 11, one on each side of the operative position of the last. Each lever 11 carries an adjustable block 13 having an inwardly extending cylinder housing a spring 19 urging a second block 25 against the block 13, a tongue and groove connection maintaining the block 25 in the position shown. The block has clamped therein a stem 27 normally extending upwardly in front of the end of the heel band. The stems can be pulled forwardly to allow access to the band. Each stem is formed with slideways to receive upper and lower slides 29, 33 coupled by an equalizing lever 37, the slides carrying rubber pads 31, 35. When operating on small shoes advance of the pads 35 may be undesirable. A hook 41 is pivoted so that it may be swung beneath the head of the slide 29 to maintain the lower slide retracted. In operation, a shoe is positioned on the jack and this first pushed rearwardly into operative position and then lifted by treadle into contact with the hold-down 9. The machine is then started whereupon the levers 11 swing to carry the pads into engagement with the shoe. The yielding rubber pads expand to press the upper just toeward of the heel breast line over relatively large areas and against the edge of the insole and prevent the formation of pleats at the waist of the shoe. The pads 35 prevent tipping of the last. The heel-band and wipers are then advanced and closed and tacks are driven through openings in the wipers. When lasting veldtschoen the pads may be caused to advance before the machine is started. For this purpose a lever 57 is provided to engage the arm 49, the lever being connected by a link 59 with a double-arm lever engaged by the jack-operating treadle 7 during the final portion of its depression. According to the first Provisional Specification, the auxiliary upper engaging members comprise vertical cranked levers each having a rounded upper arm overlying the edge of the upper and a lower arm to which is pivoted a horizontal lever carrying at each end a last supporting pad, the vertical levers being pivoted to an arm normally maintained vertical by a spring plunger engaging a recess in the arm. According to the second Provisional Specification, the compensating means between the upper and lower slides may consist of a pinion gearing with a rack on each slide, the means for locking the lower slide out of action when desired may comprise a pin engaging a hole in the slide.