Patent GB-548071-A (GB)
Title: Improvements in or relating to shoe upper conforming machines
IPC: A43D13/00
Filed: 1941-03-11
Abstract: 548,071. Lasting machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., and ROBERTS W. T. B. March 11, 1941. No: 3282. [Class 17 (i)] Machines of the kind described in Specifications 470,749, 482,275 and 489,649 are modified to permit of their being set to perform either one or two cycles, the latter being sometimes desirable for uppers of harsh or stout nature. When the machine is set to perform two cycles, only one set of tacks are driven, and the upper spreading and retarding fingers are lifted to outof-the-way position during the second cycle. An additional cam-shaft is provided whereon one cam prevents tacks being driven in the first cycle, a second raises the hold-down slightly during the second cycle for increasing the pressure of the wipers on the upper, and a third prevents the machine being stopped and the toe-rest being lowered at the end of the first cycle. A knob 35 is rotated to right or to left to cause the machine to be set for one or two cycles, respectively. Rotation to the right clutches a gear-wheel 5 to a cam-shaft 7, the wheel 5 being driven by a gear-wheel 3 of half the number of teeth of the wheel 5 and mounted on the main cam-shaft. One cam on the shaft 7 swings a threaded sleeve 63 co-operating with right and left screw-threads on stems 65 of eyes forming a link of variable length in the mechanism described in the prior Specifications for actuating the hold-down. A second cam carries a block away from a toe-rest actuating lever, to prevent the toe-rest being lowered at the end of the first cycle, and also actuates a rod 99 carrying a collar co-operating with a pawl 103 which has a tail normally abutting a step 107 in a slide 109 urged downwardly by a spring 261, the slide actuating a lever 263 connected to a main clutch control rod 265 and a brake control rod 113. A knee-lever provided for starting the power operation swings a shaft 108 freeing the pawl 103 and allowing the slide 109 to descend to start the machine, which is stopped by a cam-operated lever 105 as described in the prior Specification. At the end of the first cycle the collar 101 is depressed, thus preventing the slide being raised by the lever 105. A third cam actuates a link 123, slotted to co-operate with a pin 125 on an arm moving with the handle 129 described in the prior Specifications as preventing tack separation and driving. The links supporting the upper-spreading and retarding fingers are made extensible, each having an upper part 143 having a projection 141 normally held in a slot 139 in a lower part 135 by a spring 145. When the projection is released from its slot by a pull on a link 155, a spring plunger 147 lengthens the link and the upper-spreading fingers are elevated so that they clear the upper during the second cycle. The links 155 are actuated by a swinging frame 159 itself actuated by a rod 161 connected by a lever 163 to a hook 165 of a rod 167 reciprocated by a cam roll 171 and formed with a right-angled slot co-operating with a pin 175 for actuating the sole engaging plate as described in the prior Specifications. The rod is urged upwardly by a spring 183 and may be held down clear of the pin 175 by a latch 185. Normally, the pin is positioned in the horizontal slot, but the insertion of a shoe shifts a lever having an end 201 above a vertical slide 197 carrying a roll 195 bearing on the rod to depress it so that the pin is in the vertical slot when work is positioned in the machine, so that the insole hold-down is swung to operative position by the pin 175. When the machines is set for two cycles, the usual stop for inspection at the end of the first advance of the wipers will not occur. When the machine comes to a stop in the second cycle with the wipers in their over-wiped position, the hand lever 129 may be operated to prevent the driving of tacks. The knob 35 is geared to an eccentric actuating a link 207 to lower the link 123 when the machine is set for one cycle. If improper tacking renders an additional cycle necessary, the operator will depress the rod 167 to elevate the upperspreading fingers so that they may not foul the partly conformed upper.