Patent GB-514309-A (GB)
Title: Improvements in or relating to shoe upper shaping machines
IPC: A43D21/12
Filed: 1938-05-02
Abstract: 514,309. Lasting-machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., and ROBERTS. W. T. B. May 2, 1938, No. 13005. [Class 17 (i] Relates to machines of the kind described in Specifications 470,749 and 482,275. which describe an automatic power operated toe-lasting machine having mechanism for moving toe-embracing wipers height wise of a shoe in time relation to inward movement of the wipers over the shoe bottom, and consists in the provision of means for readily varying the heightwise position of the wipers at certain points only of the cycle, leaving the remainder of the cycle unaffected. In particular, means are provided for allowing the wipers to rest by gravity only on the upper during their retraction after their first inward movement, with or without a positive lift of less magnitude than that described in the prior Specification. The height which the wipers reach at the end of the up-wipe may be similarly varied; also the point in their advance at which they are caused to bear firmly on the upper. The flexible toe-clamping band described in the prior Specification is supplemented by clamping members urging the band against the shoe about halfway between the toe end and the toe-cap line, prior to the over-wipe. A supplementary cam and lever are provided, to ensure that adequate pressure during the successive advancing movements of the wipers may be exerted even if the main mechanism is worn The heightwise movements of the wipers are determined mainly by the cam groove 3 cooperating with a roll 13 on a lever 51 connected to the wiper support 15. To allow the wipers to rise during their retraction so that they press on the upper with the weight of their connected parts only, the part of the cam operative at this time is cut away, at 11. A small positive lift may be given at this period, if desired, by an interchangeable block 21 inserted in a cam on a driven shaft 17 co-operating with a roll 23 on a lever 27 linked to the wiper support. An interchangeable plate 57 secured to the same cam determines the height reached by the wipers at the end of the upwipe and the point during the overwipe at which they are urged against the upper margin. The appropriate part of the cam 3 is cut away so as to allow the plate to take charge. A cam surface 67 cooperates with a roll 73 on a second lever linked to the wiper supports, to press the wipers firmly on to the upper during the overwipe. The cam 67 is adjustable about the shaft 17, the cam being carried by a plate slotted to engage a block 85 adjustable about a centre 89 and held by a screw engaging one of a number of holes 95. To supplement the mechanism which causes the wipers to press firmly down on the upper, to negative wear, supplementary raised portions 261, 263 on the disk of the path cam 3 co-operate with a roll on a lever 253 connected to the wipers through screws 257 provided for taking up play. At each side of the toe band a clamping member 101 is pivoted to an arm 137 secured to a rod 135 having a twisted slot at its lower end to engage a pin on a lever 125 resiliently actuated by a push rod 111 as the wipers commence to advance, as described in the prior Specifications.