Patent GB-736799-A (GB)
Title: Improvements in or relating to shoe upper conforming machines
IPC: A43D21/12
Filed: 1952-07-04
Abstract: 736,799. Lasting-machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). July 3, 1953 [July 4, 1952], No. 16795/52. Class 17 (1). A shoe upper conforming machine has toe-end wipers 74, power mechanism for operating the wipers, upper trimming means 84 (operated automatically) to remove marginal portions from all but the outer layer of materials forming the upper while the materials are outspread on the wipers prior to the wiping, a support 82 movable to carry the wipers heightwise of the last in the shoe, and power operated means which move the wipers past the edge of the insole into a first position suitable for supporting the upper for the trimming operation and, after the trimming operation, again move the support heightwise of the last but to a second position, short of the first position, suitable for the inwiping operation. A lost motion connection may be arranged, between the support and power operated means for moving the support, which permits the wipers to be moved further heightwise relatively to the power operated member in response to resistance offered by the upper during wiping, and means provided to substantially eliminate the lost motion when the power operated member is moved to relieve this pressure and thus cause the wipers to be lifted. The particular machine described is generally similar to that disclosed in Specification 553,881, with wipers as described in Specification 574,397, but has means for quickly varying at will the width of the margin left on the trimmed layers of upper to overlap the bottom face of the insole. The upper is pulled outwardly by grippers 72 during both upward movements of the wipers and is wiped upwardly by toe former 76. The shoe, bottom upwards, is clamped against a rest plate 2 by a toe rest 4, and prevented from heelward displacement by heel rest 28. The toe rest 4 is moved upwardly by a piston 6 in cylinder 8, and the heel rest 28 swung with carrier 38 by piston 30 in cylinder 32, by fluid from manifold 12, the pressure being maintained by pump 14 and valve 22. The pressures of the fluid flowing to cylinders 8 and 32 are independently adjustable by means of devices 44 each including a piston 52, 56 with a valve 58 movable under the control of a spring 62, the compression of which is regulated by a screw 66. Any force applied to the shoe during lasting which tends to press the shoe more firmly against rests 4, 28 will serve to hold valve 58 more firmly closed. The trimming means 84 includes a lengthwise movable end knife 86 carried by an arm 90 which is swung downwardly to position the cutting edge, and a pair of side knives 88 movable widthwise and associated with vertical knives which detach the waste portion. The carrier 94 for the trimming means is fast on a post 96 rotatable and vertically movable in the frame to position the trimming means, this movement being limited by adjustable stop member 98. In proper time relation, carrier 94 is moved upwardly and swung about the axis of post 96 to position cement-applying means 100, supported on post 96, whereupon the carrier moves downwardly to engage means 100 with the insole and apply cement. Wipers 74 then wipe inwardly. The wipers 74 are mounted on holders 78 on a carrier 80 movable lengthwise of the shoe relatively to support 82 on which it is mounted. When carrier 80 is moved forwardly by fluid pressure, holders 78 and the wipers are swung inwardly over the insole. The support 82 is moved upwardly by a pair of pistons 102 movable in cylinders 104, the left-hand piston being connected by pin 112 and slot 110 to a link 106 pivoted to the support at 108, and the right-hand piston having a pin 120 engaged in a slot 118 in a link 114 fast on shaft 116 in the support. The slots provide the lost motion connection previously referred to. Lugs 124 on sleeves 122 engage pins 112, 120 to limit downward movement of the pistons. At the proper time, fluid from pipe 126 under the control of valve 127 passes to the annular chamber 125 to cause the wipers to apply increased downward pressure on the margin of the upper, the pins 112, 120 acting on the lower ends of slots 110, 118, but before the wipers are withdrawn the pressure is terminated in 125 and again applied below the piston to relieve the pressure of the wiper on the upper. The wiper support is then lowered by gravity. Upward movement of the pistons is limited by flanges 128 engaging sleeves 122. The weight of the support 82 &c. is partially counterbalanced by pins 130 subjected through springs 131 to the pressure of the fluid in the lower ends of cylinders 104 and arranged to engage the lower ends of links 106, 114. Initially, to raise the support to the higher first position, pin 120 engages a portion b of slot 118, pin 112 .being initially slightly below the top of slot 110, and assuming this position also when the pistons are in their uppermost positions. When the support is to be raised to the second lower position link 114 is swung so that pin 120 engages a stepped portion a of slot 118. The means to swing link 114 includes a latch 136 pivoted at 132 initially held by spring 138 as in Fig. 5. Between the two upward movements of support 82 the latch is swung by piston 146 of cylinder 148, the latter conveniently being in communication with the pipe leading to the means for swinging carrier 94, so that it overlies a roll 142 on an arm 144 fast on shaft 116. In response to the second upward movement of the support the latch then swings the link, which is later returned by spring 150. Latch 136 may be held in the operative position over roll 142, so that the wiper support is raised to the same lower second position on both operations, by means of a link 154 and lever 160 which is swung against the resistance of spring 164 through a latch 166 which is operated normally and secured by engagement of shoulder 170 and plate 172. In order that the trimming means 84 may be moved to corresponding positions, the position of carrier 94 may be varied by means of a member 174 normally interposed between stop 98 and the lower end of post 96, but removed therefrom when latch 166 is operated through 160, 178, 180, 182, 184, and 186 which pivots member 174 about 176. Movement of member 174 to its normal position, under influence of spring 164, is limited by member 190. Slot 156 prevents movement of lever 160 from the position shown in Fig. 5 when piston 146 is actuated. A member 194 may be swung under post 96 to prevent the trimming means moving downward sufficiently to act on the shoe. Screw 198 limits the downward movement of the wiper support, pin 120 being then only lightly in contact with portion b of the slot. The force applied by the wipers to the overwiped margin may be varied by supplementing the pressure of the fluid forcing the wipers on the margin by means of a mechanism including a spring 200, and by a valve 202 which may be positioned to admit fluid to both chambers 125, or to the chamber 125 in the left-hand cylinder only. The wipers are raised to a higher plane for retraction, as follows. A lever 210 pivoted on a bracket 208 on the support 82 has a lug 212 on one arm extending upwardly in front of the carrier 80, and a downwardly extending lug 214 on the other bent arm engaging the end of pin 112. A rod 216 on carrier 80 extends through lug 216 and a spring 218 on the rod is compressed by forward movement of the carrier, pressing lug 214 against pin 112. When the left-hand piston moves downwardly to increase the, pressure of the wipers on the upper and the pin 112 moves down slot 110 a notch 220 in the pin is entered by lug 214, taking up lost motion. Therefore when the left-hand piston moves to relieve the pressure on the upper there is no lost motion at 112, 110, the pin 112 acting through lever 210 to raise the support an amount equal to the movement of the piston, and the wipers then applying no pressure to the upper. This ensures prompt removal of the toe rest. When the carrier moves to retract the wipers a head 222 on rod 216 engages lug 212 and withdraws lug 214 from notch 220. A series 226 on a bar 224 on support 82 engages carrier 80 to limit the forward movement thereof. Specification 661,764 also is referred to.