Patent GB-253202-A (GB)
Title: Improvements in or relating to shoe upper conforming machines
IPC: A43D21/12
Filed: 1925-03-13
Abstract: 253,202. British United Shoe Machinery Co., Ltd., (United Shoe Machinery Corporation). March 13, 1925. Lasting and pulling over.-In a machine having upper-gripping tensioning means acting at least at each side of the toe end of the last and poweroperated wiping means adapted to upwipe and overwipe the upper at the toe end, the up-wiping device and the over-wiping device are mounted on a common carrier adapted, prior to wiping, to be moved automatically from out-of-the way position to a position close to the work. These devices are automatically moved in company heightwise of the shoe during the up wiping, the overwipe is then automatically performed, and lasting fasteners are driven. The movement of the overwiping device is limited by the upwiping device, and the upwiping device acts as a clamp during the overwipe, the overwiping devices increasing this clamping pressure at the end of their movement. The gripper mechanism is of the general type described in Specification 12304/03. The toe gripper 4, Fig. 6, has jaws 16 adapted to embrace the upper about the end of the toe. A short lever 10 fulcrummed at one end on a fixed pin 12 is interposed between the gripper and its cam-actuated lever 8. On this lever 10 is mounted a bracket 66, Fig. 8, in which is mounted a rock-shaft 64 carrying an arm 68 for operating the usual jaw-opening slide 72. This mechanism is operated by bringing handles 56, 74 together, by one hand of the operator, during the usual halt for adjusting the upper. Preferably, the last is positioned in the machine with the aid of a pin 46, Fig. 6, as described in Specification 230,433. The machine is provided with a main cam-shaft 6, Fig. 1, driven by a large bevel 18 normally braked by a shoe 40 interconnected with means for operating a clutch driving a pinion 20 from a constantly running pulley 26, this mechanism being controlled by a treadle 28. A pad 80 backed by a spring 86 is provided to engage the top of the fore part of the shoe. This pad may be manually swung laterally about a rod 90 carried on an arm 92 pivoted at 94. The pad is automatically pressed hard against the shoe at the second depression of the treadle 28 by a link 96 actuated by a cam slide 98. The wiper carrier 110 swings heightwise of the toe on a bearing rod 112, Fig. 9, in a vertically movable slide 114 and is yieldably depressed by a spring 124. The upwiping wipers 130 are faced with leather 132. These wipers are interchangeable with others of different shapes, and are held in position by pins 142, Fig. 10, provided with heads engaging slots in members 146 which are fitted with handles 148 for freeing the wipers when they are to be changed. For moving the wipers from their out-of-the-way position to the proximity of the work a crank-pin 152, Fig. 6, on a shaft 154 rotates half a revolution to depress the slide 114. The shaft 154 is turned by toothed gearing through a clutch on a shaft 166 which clutch is operated by a bell-crank lever 204, Fig. 1, connected by a link 202 to an arm provided with a cam piece 198 engaged by a pin 196 on the arm 92, so that the half rotation of the shaft 154 occurs when the presser 80 is heavily pressed against the shoe immediately prior to the wiping operation. This mechanism is arranged to cause one rotation of the shaft 166, and half a rotation of the shaft 154. At the end of this movement a rib 248, Fig. 2, on a disc 250 geared to the shaft 166 engages a roll 246 and releases a catch 234 engaging a clutch 218, Fig. 6, with a wheel driven from the constantly rotating pulley 26. The clutch 218 is geared to a cam-shaft 208, which thus commences to rotate, a cam thereon rocking a lever 258 linked to a slide 156 on which the shaft 154 is mounted in bearings. The wipers 130 are thus pressed hard against the toe end of the shoe. To close the wipers 130 about the toe end, their rack bars 138, Fig. 9, are then actuated by arms 268 on a shaft 270, Fig. 2, actuated by links and levers from the cam shaft 208. For the upwiping movement a cam on the shaft 208 rocks a shaft 260 connected by arms and links 298, Fig. 1, to horizontal slides 296 engaging the wiper carrier 110 by a vertical slide 294, this slide allowing for the vertical movement of the wiper carrier. One of the links 298 is arranged, during this horizontal movement, to operate a lever 312, Fig. 6, engaging a lever 310 to trip the gripper by the usual finger 308 during the up-wipe. The overwiping wipers 324, Fig. 12, are movable lengthwise of the shoe in the carrier 110 and are detachably secured to gear segments 328. Their rack bars 334 have off-set adjustable portions engaged and operated by spring plungers 340, Fig. 9, on downward movement of the wipers 324 relative to the carrier 110. The overwiping movement is limited by pins 343, Fig. 12, on the wipers 324 engaging shoulders on the wipers 130. The downward movement of the overwiping carrier is caused by toggle links 249, 350, Fig. 6, operated by a slide 347 from the cam shaft 208. For moving the toe gripper out of the way of the advancing wipers, rack teeth on the slide 347 gear with segments operating a vertical slide 366 which guides the gripper by upper and lower rolls 358. The shafts of the two rolls are connected by springs so arranged that a cam surface 375 on the gripper causes movement of the gripper lengthwise of the last during updraw. At the end of the overwiping movement the wiper carrier 110 is swung to press the wipers 324 firmly against the last. To fasten the lasted upper in position, tacking mechanism is provided. Tacker supporting plates 378, Fig. 12, are secured to the gear segments 328. A removable holder 384 holds a gang of tackers 388, one for each tack to be driven. Each tacker is normally pressed upwardly by a spring to a position determined by a shoulder 400 on the wipers 324, in which position holes 372 in the wipers are properly aligned with the tack holders. Each tacker is pivoted at 414 to a finger 412, the fingers being clamped together and the whole enclosed by a bar 410. A driver bar for each tacker slides in guides to allow of movement of the tackers with the wipers, and the tacks are driven in the usual manner by spring plungers 432, Fig. 6, raised by a cam on the shaft 208. When the tacks are driven all parts of the machine are automatically returned to starting position.