Patent GB-267998-A (GB)
Title: Improvements in or relating to shoe-upper conforming machines and methods
IPC: A43D13/00
Filed: 1925-11-24
Abstract: 267,998. British United Shoe Machinery Co., Ltd., Gouldbourn, J., and Roberts, W. T. B. Nov. 24, 1925. Pulling-over. - In a pulling-over machine, " jointing " grippers are provided for conforming the upper to the last adjacent to or rearward of the ball line without additional manipulation of the shoe. These grippers operate after the upper has been strained by the usual toe and side grippers, and, preferably, merely draw over the edge of the last and lay on the last bottom the margin of the upper tensioned by previous pulling-over. The margin of the upper is automatically introduced into the jointing grippers by the said previous tensioning. On each side of the last a bracket 11, Fig. 2, is provided, pivoted at 13 for adjustment for length of shoe. The bracket may be guided or clamped by lugs 15, the former construction facilitating adjustment in opposite directions by a lever when, for example, a right shoe follows a left shoe in the machine. The jointing grippers slide laterally of the shoe in a floating bracket 41 pivoted at 43 and restrained by a spring 49, Fig. 5, on a link pivoted to the floating bracket and engaging the bracket 11 by adjusting nuts 48. The floating bracket 41 is formed with an extension 55 for supporting a jaw carrier 51 which slides in a rectangular guideway in the floating bracket. The inner jaw 59 is pivoted at 57 to the jaw carrier and is provided with a tail 60 slotted to engage a slide fixed to the outer jaw 63, this slide also engaging a slot 69, Fig. 4, shaped to allow the jaws to swing about the pivot 57 so that in their closed position they may be parallel with the edge of the last bottom. A jaw actuator 73, Fig. 5, is provided with a roll 135 engaging a slot in a bell-crank lever 125 provided at its other end with a swivelling shackle 123 having a pin 121 through which slides a rod 115, Fig. 2, also passing through a block 113 pivoted in a similar swivelling shackle on one arm of a bell-crank lever, the other arm of which is operated by the usual side trip-spring casing of the driver bar arm. The rod 115 is gripped, in the block 113, by two pins 117 pressed together by a spring 119, and actuates the upper bell-crank lever by a further yielding means comprising an adjustable spring 127, the arrangement being that as the driver bar arm moves in, at the early part of the second half cycle, the bevelled end of the actuator 73 engages the outer jaw 63 to close the jaws and simultanously swing them into parallelism with the side of the last bottom, further movement of the actuator laying the margin of the upper over the last. To retain the jaws in their innermost position, a pawl 81, Fig. 4, pivoted on the cover of the slideway for the carrier 51 engages teeth 83 on the carrier. To prevent the floating bracket 41 yielding under the thrust of the fastener inserting means, a second pawl 141, Fig. 5, pivoted to this bracket engages teeth 145 carried by the bracket 11, this pawl being normally held out of engagement with the teeth by a nose 131, Fig. 4, formed on the end of the pin 121. The fastening mechanism comprises a driver bar carrier 155, Fig. 5, operated by toggle links 161 actuated by a ball-ended nut 167 engaging a quick thread on the shank of a member 165 pivoted to the toggle. The nut is rotated in opposite directions in timed relation to the overdraw by a flexible shaft on which is secured a pinion 185, Fig. 2, gearing with a rack operated by a lever 173 pivoted on the pivot of the usual driver bar cocking plate and bolted to this plate at 177. In operation, the toe end of the upper is pulled over as usual by toe and side grippers, the margin of the upper, in this movement, engaging the tails 60 of the jointing grippers and rocking them away from the last bottom. After the usual stop for tip straightening the jointing grippers close, swing to parallelism with the side of the last bottom, and lay the upper over the last in the region of the ball line. Meanwhile the pawls 81 and 141 have been allowed to operate to lock the jointing gripper jaws in their innermost position and support the floating bracket against the thrust of the driver bar. The fastener is then inserted and the parts return to normal position. In a simpler mechanism, wherein the jointing grippers do not swing into parallelism with the adjacent side of the last, the actuator 273, Figs. 7 and 9, engages the outer jaw 261 by interengaging hooks 275. The outer end of the actuator is provided with a guideway 277 in which is a slide 279 having a lateral extension connected to a bell crank lever operated similarly to the bell crank lever 125 but unprovided with yielding means. The actuator moves with the slide until predetermined tension on the upper has been reached, further movement of the slide disengaging the connection comprising a plunger 284 with a chamfered end engaging a corresponding recess in the slide. This slide is normally pressed home by a link 295, the free end of which is restrained by an adjustable spring 301 and the other end pivoted to a driver arm 291. A shoulder 305 on the link is freed when the plunger 284 is operated, allowing the driver arm to drive a tack under the thrust of a spring 309. This mechanism is reset by a stop 313 on the floating bracket on return of the actuator 273. Specifications 178,919, 213,263, and 248,071 are referred to.