Patent GB-507490-A (GB)
Title: Improvements in or relating to shoe upper conforming machines
IPC: A43D21/12
Filed: 1937-12-15
Abstract: 507,490. Lasting-machines. UNITED SHOE MACHINERY CORPORATION. Dec. 15, 1937, No. 34680. Convention date, Dec. 18, 1936. Addition to 475,127. [Class 17 (i)] The machine described in the parent Specification is improved in details. The toe clamping band is provided with means for increasing its pressure at the sides of the toe. The shoe is depressed as the wipers advance over the upper margin, to prevent the pressure of the wipers increasing on account of the convexity of the last bottom. Stops on the wipers limit their closing movements by engagement with the clamping band. The heel clamping band is self-adjusting about an axis longitudinal of the shoe. The clamp co-operating with the toe wipers to tension the toe end of the upper is self-adjustable about an axis extending heightwise of the last. The toe band 106, Fig. 4, is supported in slots in members 102 at its ends, 108 at its centre at the toe end, and 110, 112 and 114 at the sides of the toe. These members are backed by a spring 116, and the end blocks are pivoted to levers adjustable by a hand wheel 130 as described in the prior Specification. On the pivots 104 of the end blocks are mounted levers 134 each carrying a block 142 bearing against the spring behind the blocks 110, 112 and 114 at the sides of the toe. An adjustable spring 150 urges each block 142 inward, and a screw stop 152 determines its innermost position. The tension of the spring 116 is adjustable by screws 158. The inner meeting edges of the two wipers 164, Fig. 13, are formed with a plurality of interfitting fingers 172 and have an underlying thin plate. The rack bars are connected to the slides they actuate by springs, so that when the inward movement of the wiper is stopped by a roll 210, Fig. 5, thereon engaging the toe band carrier, further movement of the racks may be allowed by the springs. To prevent the wipers, during their advance, from pressing too hard on the upper margin because of the convex shape of the last bottom, the cam determining the descent of the shoe hold-downs, described in the prior Specification, is shaped to depress the shoe further during the advance. To allow the heel-band to tip laterally of the shoe, during the automatic levelling of the fore-part prior to lasting described in the prior Specification, the arms 274, Fig. 8, supporting the heelband are supported by a member which can swing about an axis 283 and is, normally, centralized by a spring 302. The heel band may be adjusted vertically by an arm 290 having a roll 294 engaging a groove in a vertical slide supporting the arms 274, and held in adjusted position by a spring pin 298. The member 250, Figs. 12 and 13, co-operating with the wipers to tension the upper at the toe as the wipers advance, in the manner described in the prior Specification, is constructed so that it can swing about a pin 260 and assume correct position for right or left shoes. The pin is carried by a block on a pin 262 providing a lateral horizontal pivot for the member 250, a spring 264 retaining the pin 260 in its socket and urging the member clockwise. The mechanism for removing the shoe from the machine is connected to linkages ensuring that the heel band is withdrawn from the shoe before the shoe is gripped, and that the last holder is not retracted to starting position until the shoe has been removed. Specification 355,817 is referred to.