Patent GB-555731-A (GB)
Title: Improvements in or relating to shoe upper conforming machines
IPC: A43D21/12
Filed: 1942-02-28
Abstract: 555,731. Lasting machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., and ROBERTS, W. T. B. Feb. 28, 1942, No. 2647. [Classes 17 (i) and 89 (iii)] Relates to toe-lasting machines of the kind described in Specifications 470,749, 482,275, 489,649 and 510,086, which comprise power operated wipers movable both heightwise of a shoe and inwardly of the bottom thereof, automatic means for spreading out upper material over the wipers, and tack-inserting mechanism for driving a plurality of tacks through the wiped over upper material into the shoe bottom to hold the upper in lasted position. The machines are modified to deal with stout uppers-in which looseness of the upper may occur just toewardly of the toe-cap line, and the leading end portions of the wipers may tend to spring upwardly. The tacker arms are controlled during change of tacker-aligning plates, consequent on change of wipers. Auxiliary spreading fingers 5 are provided at the ends of arms 7 pivoted to arms 9 each formed with a cam track for a roll 13 carried by a vertical slide 19 spring pressed downwardly and guided by a vertical slide 23 which carries the hold-down described in the prior Specifications. The slide 23 also carries a guide rail 41 supporting a roller 35 at the end of the arm 9. The fingers thus move vertically with the hold-down but can yield upwardly against their springs. They are swung inwardly and outwardly by arms 49 connected by a link 53 and actuated by a cam-track 69 co-operating with an arm 71 connected by a yielding coupling with an arm 89 linked to one arm 49. The coupling comprises a pair of shouldered levers 77 urged by a spring 87 to engage a pin 91 vertically movable by a handle 101 to disengage the coupling when desired. The pin co-operates with a recess in a boss 81 depending from the lever 71. The coupling yields should the fingers foul machine parts in their return to initial position. To control the tacker arms 113 while the tacker-aligning plates 111 described in the prior Specifications are changed, each end of a wire 149 is secured to the end one of a pair of lugs 147 on a plate 143 pivoted to a curved bar 135 pivoted to the table moving forwardly and rearwardly to actuate the tacker-aligning plates as described in the prior Specifications. The two curved bars are swung about their pivots by a right and left hand screw on a shaft 139 to remove the tacker-arms from the plates 111 to allow these to be changed. The tack passage in each tacker arm comprises an arcuate passage 153, the open side of which is covered by a leaf spring 155 pivoted at 159 and held in operative position by a latch 169. If two tacks should enter the passage yield of the spring prevents the breaking of the driver. To prevent upward yield of the leading end portion of the wiper an inverted U- shaped bridge has projections backing these portions of the wipers. The bridge is pivoted on one vertical post and swung to operative position where a spring plunger locks it around a second post. The bridge cannot be swung to operative position unless the arms 135 have been returned to normal position. The auxiliary spreading fingers clamp the upper materials against the wipers during at least the latter part of the upwiping movement. To vary the time when the fingers commence to move outwardly to compensate for different sizes of wipers the actuating cam-path 69 may be limited by a wear piece 193 secured to a segment 189 urged outwardly by springs 195 to a limit determined by a hand-nut 197 held in adjusted position by a spring plunger 205. Specification 489,675, [Group XXV], also is referred to.