Patent GB-622357-A (GB)
Title: Improvements in or relating to machines for trimming the margins of shoe uppers
IPC: A43D23/06
Filed: 1947-03-18
Abstract: 622,357. Lasting-machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., ELLIOTT, H. E., and MOORE, E. March 18, 1947, No. 7433. [Class 17 (i)] A machine for reducing the amount of upper material around the toes of pulled-over shoes (which may also have been side lasted), and which will deflect the margins, even of harsh upper materials, into such a relation to trimming means as to avoid these materials being too much cut into, has a number of devices which act on the upper margin at opposite sides of the toe forepart and, by repeated movements outwardly, lift and turn it progressively outwards on to a shearing block, which co-operates with the trimming means. In an illustrative form of machine similar in some respects to that described in Specification 506,270 as modified by Specification 530,981, a pair of rotary disc knives 18, Fig. 6, of equal diameter are mounted on parallel axes 20, Figs. 2, 6, substantially perpendicular to 'the plane in which a slide 8, on which they are carried, is reciprocated, and spaced approximately so that the knives cover the width of a toe of average size at the toe cap and with the cutting edges almost in contact. These knives are driven in opposite directions to sweep outwardly across the opposite margins of the shoe upper as the slide 8 is moved toewards of a shoe clamped in the machine by a heel end stop 3 and bottom engaging plate 5. Each knife operates along one of the opposite sides of the toe and half-way round the toe end. Two sets, each comprising three members, 48, are mounted on opposite sides of the slide, each set moving in advance of its associated knife rapidly to and fro at right-angles to the knives to engage the upper margin and lift and outturn it and also press it down with a firm wiping pressure against a hollow shearing block 2 supported below the cutting edges of the knives and encircling the toe end of the shoe. The block 2 has an outwardly flared upper face on which the margin is supported, and also relatively thin ears 94 which extend heelwards of the machine and also inwards over the margin of the shoe bottom adjacent where the toeward pulling over tacks normally lie. The slide 8 is reciprocated in guides 6 by a lever 12 operated by an eccentric 14 on a cam shaft 6. The members 48 of each set are mounted close together and are moved to and fro laterally of the machine by eccentrics 54 set at 120 degrees to one another and which engage sheaves 52 formed in the outer ends of the members 48. Downturned noses at the inner ends of the members 48 engage the shoe insole under spring pressure well inwards of the edge of the upper when the members are at the inner limit of their' movement. Thirteen upper-pressing fingers 34 are supported on a carrier 36 for movement perpendicular to the insole face to press against the block 2, through a spring, that portion of the margin of the upper which lies towards the toeward end, the fingers being of varying widths so as to approximate in outline to the curved portions of the knives 18 where they are closest together; so as to lie close to the adjacent portions of the two knives. The bank of fingers 34 is raised to inoperative position, when the slide 8 is at the forward limit of its stroke, and is lowered to operative position, by cam rolls 40, 42 and tracks 44, 46, after the slide has commenced its rearward movement. Rollers 96, mounted on a slide which runs in a guide in the carrier 36, track along the out-turned upper margin and press it firmly against the block 4 to aid the members 48 in urging the margin against the block in advance of the knives. When the members 48 have performed their lifting and turning operations, they are raised before commencing to return forwardly with the slide 8, by a sloping portion 114 on each of fixed cam faces 80 formed on a member 82 fixed on the machine frame, on which track cam rolls 72 mounted on camcontrolled pivoted yoke members 70. The members 70 are retained in outwardly tilted position by latches 116 to hold the inner ends of the members 48 in raised inoperative position, from which position they are released, to return to operative position, substantially when the slide 8 commences to move rearwardly for operating on the next shoe, i.e. when a treadle controlling the power operation of the machine, and to which the latches 116 are coupled, is actuated. An insole-engaging roll 150, which moves to and fro with the slide 8, is mounted centrally of the insole to the rear of the fingers 34, on a rod 154 guided in a lug 160 and adjustable heightwise relatively to the insole by a screw 166 on a stop lever 164. A tension spring 162 holds the upper ear of the rod 154 against the lever 164, which is pivoted on a pin 168 on the slide 8 and on a slot 172 in a downwardly extending limb 170, of which is a pin 174 projecting eccentrically from the end of a shaft 176 mounted transversely of the machine on the slide 8. A cam roll 180, on an arm 178 on the opposite side of the shaft 176, tracks in the forward part of a cam track 146 in a fixed part of the frame, to rock the shaft and raise the lever 164 and roll 150 to clear the margin of the out-turned upper without interfering with it, both during advancing and rearward movements of the slide 8. Specifications 470,749, 539,234, 546,671 and 561,060 also are referred to.