Patent GB-741565-A (GB)
Title: Improvements in or relating to shoe upper trimming apparatus organised for operatingon over-lasted marginal portions of shoe uppers
IPC: A43D23/06
Filed: 1953-01-01
Abstract: 741,565. Trimming lasted uppers. BRITISH UNITED SHOE MACHINERY CO., Ltd., (United Shoe Machinery Corporation). Dec. 31, 1953 [Jan. 1, 1953], No. 8/53. Class 17 (1). A shoe upper trimming apparatus has a flexible shoe-bottom engaging plate 10 which overlies the marginal portions of the bottom of the forepart of the shoe and leaves the surplus portions of the overlasted margin projecting upwardly at the inner edge 30 of the plate, a trimming knife 12 extending widthwise of the shoe above the plate 10, knife supporting means including two holders 52 in which the ends of the knife are secured, and an arrangement for sliding the holders lengthwise of the shoe and, at the same time, urging the holders independently into engagement with opposite side portions of the plate, so that an intermediate portion of the knife is maintained in sliding engagement with the plate in the vicinity of the inner edge thereof. The inverted shoe is pressed upwardly against the plate by a toe rest 32, and the holders have independent pivoted movement about widthwise axes 64 so that the knife may accommodate its shape to the height-wise curvature of the shoe bottom. Toe rest 32 on piston 34 in cylinder 36 is actuated by fluid pressure, e.g. on presentation of the shoe which through 44, 39, 41, 43, &c., controls the fluidcontrol valve, and is returned by springs 38. The knife is removably held in slots 56 in holders 52 by leaf springs 58 engaging pins 60 extending through holes in the holders and the knife. Pins 64 are rotatable in levers 66 pivoted on arms 68 of bell cranks 70 mounted on a fixed shaft 72. The cutting edge 50 of the blade is urged upwardly by weak springs 74, while strong springs 78, adjustable at 84, connecting levers 66 and arms 82 of bell cranks 70 tend to lower the knife. Pivotal movement of levers 66 is limited by stop screws 86. To operate the knife from the inoperative position of Fig. 1, the bell crank 70 is swung through 89, 90, 94 by piston 96 actuated in cylinder 98 by fluid under pressure, and is returned by spring 102. As arms 68 are lowered portions 54 of holders 52 contact plate 10 to effect independent pivotal movement of the holders about pins 64 to engage edge 50 with plate 10 against the influence of springs 74. Levers 66 are consequently moved clockwise (Fig. 1) against the tension of springs 78. Waste material is removed into shoot 110 by an ejector 14 driven, in timed relation and with rapid relative pivotal movement to knife 12, on lever 112 pivoted on yoke 114 through 118, bell crank 120, 126, link 128 and bell crank 130 which is actuated by a projection 138 adjustably secured on arms 89, 90. The ejector sweeps quickly through an operative arc in grazing relation to knife 12 as the latter has completed its trimming stroke but is still advancing toewards. The ejector linkage is returned by spring 140, stop pin 144 limiting movement. Conveniently an adjacent fluid pressure operated toe lasting machine develops and maintains adequate fluid under pressure in an accumulator 16. The actuation of the fluid control valves is described. The shoe may be released without actuating the trimming knife by pushing knob 125 rearwardly to release the shoe clamping control valve. The knife may be operated without operation of the lasting machine by pulling knob 99, which through 103 and 105 depresses valve stem 101 to admit fluid into cylinder 98 from accumulator 16. Specifications 553,881 and 630,407 are referred to.