Patent GB-618844-A (GB)
Title: Improvements in or relating to machines adapted for lasting shoes
IPC: A43D25/053
Filed: 1946-11-16
Abstract: 618,844. Lasting-machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. Nov. 16, 1946, No. 34039. Convention date, Nov. 17, 1945 [Class 17 (i)] Consists in improvements in the construction and operation of the wiper and presser members of a lasting machine of the kind wherein the margin of stock to be lasted is continuously wiped inwardly of the last and is pressed into adhering relation with the shoe bottom, as the shoe leaves lasting means which comprise a presser member and a driven arm between which the stock is gripped and progressively tensioned in a direction substantially perpendicular to the shoe bottom and then inwardly from the edge towards lasting position. Frictional drag imposed in a direction to feed the work causes it to move continuously past the lasting means. The invention is described as applied to a machine of this kind similar to that described in Specification 585,121 as modified by Specification 611,972, and has a friction roll 10 for tensioning and overdrawing the stock, the lasting margin of which is yieldingly pressed against the operative face 11 of the roll at two circumferentially spaced points by a presser member comprising a body 12 and a hinged portion 14. A rotary wiper 16, edge gauge roll 18 and shoe bottom rest 20 are also provided. The wiper 16 comprises a relatively thin disc secured to the end of a shaft 182 journalled in a block 184 mounted in a housing 190, in an angularly adjustable manner, and is continuously driven in the direction of the arrow marked thereon in Figure 1. It has a plurality of circumferentially disposed helical ribs 300 with rounded leading ends each in substantially axial alignment with the trailing end 304 of the next preceding rib so that hammer-like blows are struck on the lasting margin of the stock by the rotary movement of the wiper. The roll 10 is mounted at the lower end of a shaft 30 so as to be adjustable in relation to the wiper 16, without altering the vertical position of the roll in its bearing block 32, bracket 36 of which is slidably mounted in a member 42 secured to a slide 45 supported in a guide bracket 52. The roll is also movable forwardly and rearwardly of the machine by the operation of a treadle which moves a rod 64 to move a cam groove 60 formed in a cam bar 62, and thus move a cam roll 58, carried by a bracket 59 secured to the slide 45. The roll 10 is driven through a main input gear 78. The body portion 12 of the presser member is mounted on an arm 112 pivoted on the bearing block 32 of shaft 30 to permit its adjustment laterally of the machine and relatively to the roll 10. The part 14 of the presser member is pivoted on a pin on the portion 12 under the action of a spring 122. As the slide 45 is moved, by depression of the treadle referred to above, the arm 112 is swung on its pivot 114 by rod 130 and spring 148 until the presser member almost contacts the roll 10, after which the spring 148 is compressed. A stop screw 155 prevents actual contact. Release of the treadle causes the cam bar 62 to move upwards under spring action to permit the reverse action, the presser member 12, 14 being adjusted relatively to the role so that the hinged part 14 contacts the lasting margin just prior to the part 12. In a modified construction of presser member, Fig. 4, the portion which presses the lasting margin against the roll at a locality inwards of the edge is omitted and the side face of the wiper 16 is used for this purpose. The body portion 12 of the presser member which is in direct engagement with the upper stock may be electrically heated by a unit 500, Fig. 4, in order to activate the cement. The wiper may be heated by radiation from an electric heating unit 514 adjustably mounted on the bracket 36. Both forms of heating unit may be thermostatically controlled.