Patent GB-153353-A (GB)
Title: Improvements in or relating to shoe upper-pulling machines
IPC: A43D13/00
Filed: 1919-07-17
Abstract: 153,353. British United Shoe Machinery Co., (United Shoe Machinery Corporation). July 17, 1919. Lasting and pulling-over.-Relates to shoe upper-pulling machines, and particularly to pulling-over machines such as those of the type described in Specifications 7005/00 and 12304/03, and comprises an arrangement whereby power mechanism for pulling the upper is under such control as to enable the operator to check the pull instantly when he sees that the desired or permissible tension has been reached. Figs. 1, 4, and 6 show one construction according to the invention applied to a machine of the type described in the above-mentioned Specifications, each side gripper being connected to an up-draw lever 8, which is operated in the usual manner by a cam-slide 10 through yieldable connexions, including a spring 12. The slide 10 is actuated by a cam 14 on a shaft 16, which is inclined upwardly and forwardly with respect to an horizontal plane and carries a large bevel-wheel 212 in gear with a pinion 214 on a shaft 216. This shaft carries fixed and loose clutch members 218, 222, which can be forced into engagement with each other by connexions 226, 228, 230, 232, 240 with a treadle. As usual in this type of machine, a clutch is tripped to cause power mechanism to drive the shaft 16, which makes a partial rotation and then automatically comes to rest with the upper under tension to permit inspection and adjustment of the work; when the clutch is again closed, the shaft 16 completes a revolution to actuate mechanisms for the overlaying and tacking operations. In order that the tension of the upper may be increased or relaxed, each side gripper is arranged to be operated through a. supplementary mechanism controlled from a hand lever 246. the two hand levers being arranged in close proximity so that they can be operated by one hand. Each hand lever is connected through a link 284 with a bell crank 286 engaging trunnions on a spring-pressed slide 280. which is provided with flanges fitting into grooves 282 in rack members 270, 278 mounted respectively in guides on slide members 264, 272: these members are geared together through an idler pinion, and the member 264 is connected to the rear portion of the lever 8. The rack members 270, 278 are adapted to be moved into engagement with a worm 262 on a shaft 260, which is continuously driven through bevel wheels 258, 256, a shaft 252, and a pinion 250 engaging a gear wheel 248 on the hub of the pulley 222. Movement of the hand lever 246 therefore causes the slide member 264 to be moved to increase or decrease the pull on the upper. The slide member 264 is locked in the position into which it is moved bv a spring-pressed toothed catch 296 engaging teeth 298 on the slide; a controlling slide 306 prevents the catch from engaging the teeth until after the main upper-pulling movement of the grippers has been effected. The catches 296 provide for the unyielding strain on the upper to be maintained during the earlier portion of the second step of the machine cycle. Figs. 8 and 9 show another construction. A shaft 1 carries a large gear wheel 2 which is formed on a constantly running pulley and gears with a pinion 4 associated with the toe and left hand side grippers, a similar pinion also gearing with the wheel 2 being arranged on the opposite side of the shoe in association with the other side gripper. The wheel 4 through worm .gearing and a vertical shaft 100 drives a shaft 116 which, through a worm and wheel 110, 122 drives a short vertical shaft 126 carrying a bevel wheel 118 in gear with two bevel wheels 130, 132 loose on a transversely-movable shaft 134. This shaft carries a fixed pinion 136 having clutch teeth on its opposite faces for engagement with similar teeth on the wheels 130, 132 and gearing through a wheel 137 with a segmental rack on a lever 140. which is fulcrumed on a plate 142 and is provided with a toothed hub meshing with a. gear segment 143 secured to the updraw lever 144 of the toe gripper 145. This lever is pivoted on a rod 146 and is connected at its rear end through an adjustable spring 148 to a slide 147, which is operated from a cam 150 on a shaft driven at times by a pulley 129 belted to a pulley 131 on the shaft 1; the usual treadle and machine controlled clutch is provided between the pulley 131 and the constantly running pulley-carrying pinion 2. The side grippers 47 are carried by updraw levers 45 fulcrumed on the rod 146 and connected through springs 48 with a slide 49, which is operated from a brake cam 50 on the cam shaft by which the machine is stopped automatically with the upper under tension and again at the end of a full cycle of operations. The machine can be operated, if desired, in the usual way and independently of the mechanism now to be described. This mechanism for the toe gripper is controlled by a hand lever 160 pivoted on a stud 162 and connected to the inner end of the shaft 134 for moving this shaft endwise. In practice, the spring 148 may be adjusted so that during the first movement of the machine, the upper is pulled yieldingly about the last to straighten it, the final pull being effected by the power mechanism under the control of the hand lever 160; the final pull is unyielding, and the tension is increased or diminished by movement of the hand lever 160 to clutch the pinion 138 to one or other of the bevel wheels 130, 132. The shaft 134 is held in its endwise adjusted position bv a brake 195, while the position of toe gripper is maintained by one or other of two spring-pressed pawls 170, 172 cooperating with ratchet teeth on the outer end of the shaft 134. For operating the side grippers, the shaft 116 carries a clutch member.178 movable by means of a hand lever 180 into driving engagement with one or other of two bevel wheels 184, 185 in gear with a wheel 182 on a vertical shaft which carries a screw 183 working in a block 186 connected through a slide 188 and fork members 191, 192 with the updraw lever 145. A similar mechanism is provided for the other side gripper, and the two hand levers 180 are arranged in close proximity for manipulation by the same hand. To restore the hand lever 160 automatically to normal position after each use, an arm 197 connected to the brake rod 198 is swung upwardly when the brake is released and the machine started for the overlaying and tacking operations and through a link 199 swings a pivoted cam 200 so that guideways in the cam acting on a roll 204 depending from the hand lever, wedge the roll and lever to central position. At the same time, the walls of a tapering recess in the arm 197 engage a roll 206 on the hand lever 180 and restore this lever and its associated parts to normal position. Specification 3958/11 also is referred, to.