Patent GB-803330-A (GB)
Title: Improvements in or relating to machines suitable for attaching heels to shoe bottoms
IPC: A43D79/00
Filed: 1955-12-07
Abstract: 803,330. Heel attaching machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). Dec. 6, 1956 [Dec. 7, 1955], No. 35079/55. Class 17(1) A heel attaching machine having a nailing die 48, a shoe supporting jack 46 movable by fluid operated means 58 to press a shoe 34 and heel 30 against the die, and nail drivers 56 operated by second fluid operated means 62 to drive nails through the heel and shoe bottom, has the following additional features. (1) Operation of the driver operating means causes a reactive force, substantially equal to the driver operating force, to be transmitted to the jack to press the work firmly against the die. (2). Both fluid operated means are controlled by means responsive to the movement of the nail drivers to predetermined positions. (3) When a top-piece is to be attached the nails are driven so that they protrude from the heel, the top piece on a carrier is moved into position over the die, the drivers are then rendered inactive, and pressure is applied to the jack to cause the top-piece to become attached to the heel. (4) The pressure applied to the jack is light for pressing the work against the die, high for nail driving, but lower for attaching the top piece. Jack 46 pivoted to an adjustable bar 74 carries an adjustable last pin 82 on which the last 36 with shoe 34 is located, and is presented manually so that the round crease of the shoe engages crease band 90 of backguage 60. Loader block 92 receives nails from distributer 104 via tubes 100, 102 at the position shown in Fig. 2, and is then moved to a loading position, to deliver the nails to passages 64 in die 48, by a one revolution clutch 172, tripped by striking knob 174, which acts via drum 186, adjustable pin 188, telescopic rod 190, 192, and 194, 196, 202, 204, 206 to rotate arm 156 about 170. Near the end of such movement screw 213 engages frame 78 and swings bell-crank 101, 103 so that a latch pin is disengaged from shutter 210 which is then swung clear by a spring allowing the rails to drop. The replaceable driver head 54 is moved vertically beneath replaceable die 48 by piston 132 in cylinder 136. Carrier 50, with heel 30 and top-piece 32 positioned by adjustable rear and breast gauges 162 162a, 164, 164a, is moved transversely against spring 157 (not shown), by arm 156, to enable the die 48 to be loaded from block 92 and as arm 156 returns carrier 50 also returns until it is latched in heel attaching position by latch 384. Depression of treadle 214 against weak spring 209 sufficient to engage stud 215 (not shown) on a stronger spring results in the closing of switch 220 and energization of solenoid S1. On further depression switch 222 is closed and energizes solenoid S2. Spools 244, 314, 340 of valves 234, 316, 336 respectively are normally urged to the right, Fig. 5, but are moved to the left when respective solenoids S1 S2, S3 are energized. When the machine is powered and treadle 214 raised fluid from pump 226 passes via relief valve 240, 238, 248, 250 to chamber 252 forcing piston 258 downwardly and the latter via rod 262 and rocking beam 264 holds jack 46 raised. The fluid passes from 252 via 270 to chamber 268, keeping piston 132 and drivers 56 depressed, and via relief valve 276, 274, to reservoir 272 and exhaust at 278, 242. Pipe 288 exhausts through 287. When S1 is energized fluid passes via 238, 248, 288, and sequence valve 290 to chamber 282, acting on small face 304 to raise piston 258 so that the jack is moved to hold the shoe on the heel. When the pressure in 288 is sufficient, fluid passes via 300 to raise spool 292 against the adjustable spring 298, and hence to 302, 302a, and from the latter via 322, 326, to relief valve 328, 334 to valve 336, and to exhaust at 352. 250 exhausts through 291. Fliud enters chamber 306 via valve 312 as piston 258 rises with S2 not energized, exhaust 355 is cut off, and chamber 367 exhausts via 365, 359. If the operator is satisfied he depresses treadle 214 further to energize S2. Thereupon 367 and 306 are cut off from exhaust, and fluid passes from 302a, via 322, and 365 to chamber 367 raising piston 132 with drivers 56 to drive the nails. As the drivers meet resistance pressure builds up in 367 and a reactive force is imparted via 302a, 302, 376, 378 (366 being raised) and chamber 306 to face 371 of piston 258. The areas of faces 369, 371 are equal so that the force added to the holddown force on jack 46 is equal to the force driving drivers 56. When the nails are driven a striker 375 closes switch 381, de-energizing S1 and S2, the heightwise adjustment of the striker controlling the degree to which the nails are driven. With the return of spools 244, 314, pistons 258, 132 are depressed by fluid passing to 252, 268. Return of fluid from 306 via 302 &c. is restricted at valve 364, sleeve 366 being lowered the fluid passes through 380 past throttle screw 382. Valve 301 permits flow from 302 to 288 but prevents the reverse flow. When rod 262 is lowered after nailing the latch 384 is released. whereupon a spring moves the carrier to position the top-piece for attachment, and plunger 354 of switch 356 is moved to open contacts 358 and close contacts 358a. When treadle 214 is then depressed S2 is not energized so that drivers 56 are inactive, but S1 and S3 are energized and the latter moves spool 340, shutting off 334 from exhaust at 352, and the pressure builds up to a limit controlled by the adjustment of screw 362, and via 302, 306, and face 371 of piston 258 augments the hold-down pressure applied to the jack so that the top-piece is secured to the protruding nails. When the treadle is released S1 and S3 are de-energized, 288 and 302 exhaust, and piston 258 is returned. When he has removed the shoe from the jack the operator strikes knob 174 to trip the clutch, so that arm 156 is moved for die loading and moves carrier 50. When a complete heel, i.e. with no separate top-piece, is to be attached, latch 384 is retained in an inoperative position and a carrier 50a (not shown), with a replaceable heel holder, is used. The carrier is moved, so that die 48 may be loaded, by arm 156 acting via an adjustable coupling, being raised slightly by cam roll and groove to avoid friction. For such operation valve 316 is not necessary, and pipe 302 could be connected directly to pipe 365. The electrical circuit for the apparatus, Fig. 6, includes a starting switch 480, an energizing stop switch 468, and a safety switch 474 which is opened when cover 144 is lowered for the replacement of die 48 &c. Specification 14719/11 [Class 17] is referred to.