Patent GB-769316-A (GB)
Title: Improvements in or relating to shoe upper conforming machines
Inventor: CHOICE FRANK COLEMAN
IPC: A43D21/16
Filed: 1954-02-04
Abstract: 769,316. Shoe upper conforming machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. Feb. 3, 1955 [Feb. 4, 1954], No. 3274/54. Addition to 732,060. Class 17 (1). A shoe upper conforming machine in accordance with claims 1 or 2 of the parent Specification is modified as follows:- 1. The antifriction means comprises a single rotatable element 70 interposed between the jawclosing means 40 and the gripper carrier 24 to engage them both at a locality in which side thrust is developed by engagement of the closing means and a tail 34 of one of the jaws. The roller 70 engages the jaw closing roll 36. 2. The device for restraining the carrier 24 against movement relative to the actuating member 20 towards the shoe when the jaws release the upper comprises a member 90, 92, connected to the carrier 24 and arranged to lie along the actuating member 20 and a locking arrangement for automatically locking this member against movement relative to the actuating member in a direction which would permit that relative movement of the carrier. In the normal position, Fig. 2, tacker arms 118 act through adjustable set screws 142 to position pivoted arms 120 so that levers 104 are spaced from members 90, 92, so that the latter with carriers 24 are free to move, levers 104 being pivoted at 102 to U-members 100 and connected to arm 120 by stirrup 116 which is adjustable in length and pivoted to arm 120. The spacing of lever 104 from members 90, 92 is adjusted by screw 112 which moves wedge 110 between member 100 and the gripper bar 20. In the second stage of the operation movement of the tacker arms 118 to positions beneath the shoe permits springs 136 to swing arms 120 so that noses 106 of levers 104 squeeze together members 90, 92, plates 96, and carriers 20 to lock the carrier against movement relative to bar 20. The lock is released by return of arms 118. 3. The toe gripping arrangement includes operator actuated means 154, 156, for moving the gripper carrier relatively to the actuating means during a pause in the operation while tension is being applied to the upper, so that the operator can cause the jaws to release the upper if desired and take a fresh grip, the device comprising a locking arrangement, associated with the operator actuated means, which is ineffective during the pause but automatically rendered effective to restrain the carrier against movement relative to the actuating member in a direction towards the shoe when the jaws release the upper at a later stage. Movement of hand grip lever 154 moves, through 172, 164, rocking lever 156 which overlies the upturned end of an extension of the toe gripper casing to move that casing and so open the jaws, the jaws close again when lever 154 is released. Hand lever 150 is secured to an extension 152 of the front gripper updraw lever, and at the end of the first stage may be manipulated to vary the pulling action of the toe gripper. During the first stage and the early part of the second stage of the operation a block 200 on the tacker arm engages roll 198 on pivoted lever 190 so that lug 188 on the lever supports a slidable rod 186, as in Fig. 4, and the rod, in turn, supports locking member 176, pivoted at 178, in such a position that rod 164 can pass freely through a bore 174 in member 176. When the tackers move inwards during the second stage block 200 moves away from roll 198, and spring 194 moves member 176 about its pivot to lock rod 164 against downward movement (Fig. 4). When the jaws release the upper the gripper casing is held against movement towards the shoe relative to the gripper bar, since lever 156 is engaged with portion 158 (Fig. 3, not shown) and is prevented from moving by the fact that rod 164 is locked. The locking arrangement is initially set by adjustment of the overall length of link 180. 4. The cam controlling the movement of the actuating cycle member 20 is so shaped that at the conclusion of a movement of the member, in a direction to connect with the jaw closing means, is not complete, but the member is moved to make the connection before being moved in the opposite direction to close the jaws, this ensures that spring 54 is not heavily compressed while the machine is at rest. Thus cam wall 210 at a-b, Fig. 5, does not follow the outer wall, but rises more slowly so that cam roll 214 is positioned as shown, i.e. not its outermost position, at the end of a cycle. The cam-shaft may be reversed at the end of the first stage to restore the parts to initial positions, the cam roll 214 following a different path in this reverse direction so that at the completion of the cycle the actuating member is positioned so that the jaws are open. In the forward direction roll 214 follows wall 210, depressing the spring pressed member 216, but in the reverse rotation the roll follows path b-x, and remains at its outermost position at the end of the cycle. Specifications 12304/03 [Class 17] 396,086 and 550,831 also are referred to.