Patent GB-525566-A (GB)
Title: Improvements in or relating to machines adapted for use in the manufacture of pre-welted boots or shoes
IPC: A43D25/08
Filed: 1939-02-23
Abstract: 525.566. Lasting machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). Feb. 23, 1939, No. 5982. Addition to 470,768. [Class 17 (i)] Relates to improvements in the machine described in Specification 470,768. Improved welt engaging members work the upper margin over the bottom of the last, and insole holding down fingers are provided outside the last depressor. The work support comprises fingers 20 engaging the crease between the welt and upper. Resilient upper-spreading fingers 22 are mounted on a crosshead 36 slidable on vertical shafts 35. A second crosshead 32 (not shown) is linked to a lever 42 linked to a treadle. The crosshead 36 is connected to the crosshead 32 by a spring so that its movement can be arrested by a nut 68 engaged by a stop 66 carried by the crosshead. The crosshead is retained in its lower position by a latch 56 engaging the lever 42. A handle 64 releases the latch and a spring 40 returns the lever 42 and crosshead to starting position. Insole hold-down fingers 80 are carried by a crosshead 84. Downward movement of the last depressor 24 is effected by a second treadle linked to a rotary member 110 linked by an arm 116 to a second rotary member 120, a cam thereon actuating a lever 130 linked to a crosshead 92 latched at 98 to the crosshead 84 normally urged upwardly by a spring 104. The latch is released by a cam-operated link 142, which also pushes the crosshead 84 positively upward. The heel end of the last and shoe is engaged by a pad 182 on a lever 184 connected by a yieldable link including a spring 196 to an arm 186 moving with the lever 130. Toe-end gripper plates 26 are secured in carriers 27 with arc-shaped shanks slotted to engage guide rolls 212. The plates are advanced by a lever actuated by a cam secured to the rotary member 110. A torsion spring 216 urges the plates towards each other and adjustable springs 224 urge them away from each other. Side portions of the upper are engaged by plates 248 actuated by levers 264 swung by cams 256 secured to the member 110, yield being provided by springs 274. A lever carrying a pad 290 has a hook engaging a shoulder on a disc carried by the member 120 for stopping the member for inspection of the upper. The work supporting fingers 20 are in five groups, the forward side members being adjustable on a bed-plate 326 adjustable on a table 298. The rear side plates 338 are quickly releasable for exchange. The front of the table is supported on pins 300. and the rear by an arm 302, which is tilted to enter a hole in the table and allow it to drop by a screw in an arm 320 moving with the member 120. In operation, an upper with welt attached having been positioned on the fingers 20, the first treadle is depressed, causing the fingers 22 to descend so that the lower ends of the fingers enter the supported upper. As the fingers descend they spring outwards to engage the inner surface of the welted upper margin as described in the prior Specification, and the latch 56 maintains the fingers in their lowest position. A last is then inserted, and the operator depresses the second treadle, moving the last depressor 24 downwardly to force the forepart of the last into the supported upper. The insole hold-down fingers move downwardly to prevent the edge of the insole being lifted, and the rear pad is brought up to the shoe. The toe-end gripper plates advance, and then the side gripper plates advance. As the plates advance they separate from each other, which prevents puckering of the upper. The plates move independently so that a right or a left shoe may be operated on. The fingers 22 are released by a cam as the plates 26 begin to advance. The fingers 80 are allowed to rise as the upper reaches the concave lower parts of the fingers. Before the plates 26, 248 have completed their advance the operation of the machine is stopped so that the operator may inspect the upper. The operator then strikes the pad 290 to allow the second treadle to be further depressed to complete the advance of the plates. The table is then dropped at the rear, the second treadle is allowed to return, and all parts return to starting position.