Patent GB-940741-A (GB)
Title: Improvements in or relating to shoe upper conforming machines
IPC: A43D21/16
Filed: 1960-01-20
Abstract: 940,741. Shoe upper conforming machines. BRITISH UNITED SHOE MACHINERY CO. Ltd. Jan. 22, 1960 [Jan. 22, 1959], No. 2154/60. Heading A3B. A shoe upper conforming machine for performing pulling over and lasting operations on the toe and forepart portions, at least, comprises a support arranged to engage an insole on the bottom of a last within an upper, fluid-pressure operated upper controlling means for engaging marginal portions of the upper so as to exert a restraining action thereon while movement of the support relative to the upper controlling means takes place to tension the upper over the last, and a fluid-pressure operated wiper arrangement. The shoe is supported by a movable rest 20 (Fig. 10) mounted on a post 50 and comprising a pair of arcuate members 22, 24 and two pairs of springs having capped upper ends 36. The arcuate members 22, 24 are pivotally mounted on a pin 26 and urged apart by a spring 32. The springs having caps 36 are mounted in blocks 38 which can be adjusted widthwise of the shoe to accommodate different sizes of shoes by turning a knurled disc on a stud 40 threaded in the blocks 38. The members 22, 24 are carried by a block 28 pivoted at 52 and can be swung to an out of the way position (Fig. 12, not shown) against the influence of a spring 58 acting through a plunger 56. The lower end of the post 50 carrying the shoe rest 20 carries a piston 68 (Fig. 3) in a cylinder 70, and a spring 72 urges the post 50 downwardly. The machine has air pressure operated upper controlling means 90 including a toe end distributer member 94 and side distributer members 96. The member 94 is secured to a block 106 (Fig. 3) and operated through pivoted linkage 108, 110, 112 by a pneumatic piston and cylinder 114 against the action of a return spring 121. The upper end of the link 112 is connected to a diaphragm 119 in a cylinder 120 of larger diameter than the cylinder 114. The distributer members 96 are detachably secured by angle brackets to non-rotary piston rods operable by air cylinders 126 (Fig. 5). Two distributer grippers 98 are provided, each comprising a fixed jaw 100, and a pivoted jaw 102 having a cam surface 138 engaged by a roller 140 mounted on a piston rod 142. The rod 142 is urged downwardly by a spring acting on a piston in an air cylinder 148. The cylinder 148 is pivoted by a pin 158 to a lever 160 so that the distributer gripper is supported for swinging movement lengthwise of the shoe about the pin 158. The lever 160 is pivoted on a pin extending lengthwise of the shoe, for swinging movement towards the shoe limited by a stop nut 188 threaded on a rod 174 extending through a slot in the lever 160. The initial position of the distributer gripper can be adjusted by means of a knob 190 on a rod 174. The distributer grippers 98 can be moved toewardly of the shoe by a composite lever 192 fulcrumed on pins 194 and comprising spaced arms 198 supporting members 200 against which the cylinders 148 are urged by springs 162 (Figs. 4, 8, not shown). The lever 192 is operated by a piston rod 202 and cylinder 204 and its movement is limited by studs 206, 208. Ball grippers 104 (Figs. 2, 3) comprise levers 212, 214 provided with jaws and pivoted at 220. The jaws are closed together against the action of a spring 228 by means of an air cylinder 224 whose piston rod 226 carries an actuator 230 for urging rolls 232 on the levers 212, 214 apart. Each ball gripper is mounted for free rotation about the axis of its cylinder 224 on a strap 234 pivoted at 235 on an equalising lever 236. The spacing apart of the ball grippers can be adjusted by means of a threaded stud 246. The lever 236 is pivoted at 238 on a rod 240 which is movable in a block 248 and urged downwardly by a spring 262. The block 248 is adjustable heightwise in a bracket 252 which is adjustable forwardly and rearwardly in, the machine. Interchangeable wipers 92 (Fig. 5) are operated by a piston 298 and cylinder 300 (Fig. 3), a piston rod 294 being connected through an equalising lever 292 and links 290 to carriers 280 supporting the wipers. Each carrier 280 is provided with a pair of rolls 282 guided for movement in cam slots 284, 286 (Fig. 5) in a bed plate 288. The wipers are operated by air admitted to the cylinder 300 against the action of a return spring 302, a sleeve 304 limiting the stroke of the piston 298. The position of the wipers can be adjusted by turning a threaded rod 310 to move a lever 306 about a pivot 308. The rod 294 has a spear like end forming a flat auxiliary wiper 320 which slides forward on shoulders 319 on the main wiper 92 when the latter are closing. Electric heaters 322 are mounted in the carriers 280. A toe holddown 330 (Fig. 3) is operated through a pivoted lever 334 and link 338 by a piston 342 and cylinder 344 against the action of a spring 346. A heel embracing flexible band 332 is operated by an air cylinder 350 and double acting pistons 352. The piston 352 is fixed, and the cylinder 350 connected to two telescopically adjustable rods 356. The heel band 332 is adjustably clamped in slotted arms 362 carried by the rods 356. Air operated plungers and ratchets (Fig. 9, not shown) which are normally disengaged, lock the band 332 in shoe engaging position. A detector finger 384 (Fig. 11) ensures that a variable predetermined margin of the upper at the toe end of the shoe will be available for wiping purposes. The detector finger 384 is secured to a lever 386 which is pivoted at 388 (Fig. 6, not shown) for movement in a plane extending heightwise of the shoe, finger 384 being biased upwards by a spring acting on lever 386 but restrained by a wire 396. This wire is adjustably connected by a screw to the block 106 carrying the toe end distributer member 94. On commencement of upwards movement of the shoe rest 20 the distributer member 94 yieldingly presses the margin of the upper U against the wipers 92 and spaced projections 380 of an L-shaped member 382 (Fig. 11). This upward movement of the member 94 and block 106 allows the finger 384 to engage the upper. When the edge of the upper is withdrawn from engagement with the finger 384, the spring moves the finger 384 further up so as to allow a trigger on the lever 386 to operate a switch to energise a solenoid 438. This causes the member 94 more firmly to restrain the upper against further withdrawal (see below). The pivot 388 (not shown) is supported by a lever which can itself be pivoted about a heightwise extending axis by turning a threaded rod so that the position of the finger 384 lengthwise of the shoe can be adjusted. While the distributer member 94 is exerting maximum pressure on the upper and the post 50 continues to rise, the distributer members 96 are exerting a de-wrinkling action on the upper which is also held tensioned by the distributer grippers 98. Operation. After positioning the upper U and last L on the shoe rest 20, the operator closes a foot switch to energize solenoids 418, 420 (Fig. 22) which operate valves 426, 428 respectively. Air under pressure is thereby admitted to cylinders 148, 224 for operating the grippers 98, 104 to grip the upper. By means of a restrictor valve 430 air is then admitted to the cylinder 204 to swing the lever 192 so as to exert a toeward tension on the upper as well as the downward pull. Air pressure then builds up to actuate a pressure switch 432 which energizes a solenoid 434 to shift a valve 436 and supply air under pressure to cylinders 114, 126 and 70. The distributer members 94, 96 are thus moved upwardly to engage the margin of the upper against the wipers 92, and the post 50 is moved upwardly to tension the upper. When the margin of the upper clears the detector finger 384 the solenoid 438 is energized and operates a valve 440 to admit air to the cylinder 120 to apply increased pressure on the distributer member 94. Near the end of the upward movement of post 50 a nut 452 thereon (Fig. 2) engages a loosely mounted plate 444 and causes it to actuate a switch 450 and hence energize a solenoid 454 (Fig. 22). A valve 456 is consequently shifted and air supplied to cylinder 346 to operate the hold down 330. Air is also admitted to cylinder 350 to operate the heel band 332 which is then locked in position by plungers 374. In addition, air is admitted to the cylinder 300 through a sequence valve 458 and the wipers 92 begin to close. Closure of switch 450 also energizes a timer coil 5TR (Fig. 23, not shown). Just before the wipers reach the upper, an actuator 416 (Fig. 5) on the piston rod 294 operates a switch 414 to de-energize solenoids 418, 438 (Fig. 22). De-energizing solenoid 438 releases the high pressure exerted by the toe end distributer member 94, but the upper is still releasably held due to pressure in cylinder 114. De-energizing of solenoid 418 permits the distributer gripper operating pressure in cylinders 148 to start diminishing, air escaping through a restrictor valve 431. Control of the upper is thus gradually transferred from the upper controlling means to the wiping means. A cam 425 (Fig. 5) on the piston rod 294 then operates a switch 424 to de-energize timer coil 5TR and solenoids 434, 420 permitting return of the members 94, 96 and grippers 104 to their inoperative positions. The shoe rest 20 also moves away from the insole leaving the shoe supported between the wipers 92 and the hold down 330. A dumping valve 460 (Figs. 5, 22) actuated by a cam 462 on the piston rod 294 ensures quick return of the shoe rest after the wipers have moved approximately two-thirds of their travel The holddown now exerts increased (bedding-down) pressure on the upper due to the deenergized solenoid 434 being effective through a sequence valve 463 to shift a two way valve 464 to admit air under pressure through a valve 465 to the cylinder 344. After a predetermined interval the timer operates to de-energize holding circuits (Fig. 23, not shown) and allow the holddown, heel band