Improvements in or relating to machines for effecting relative movement between shoes and lasts

摘要

616,674. Boot-making machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., and PRATT, J. W. (United Shoe Machinery Corporation, in part). Sept. 21, 1946, No. 28331. Addition to 614,363. [Class 17 (i)] Putting shoes on lasts.-The machine of the parent Specification is modified to permit engagement of the friction tool at different localities longitudinally of the shoe 'bottom during the operation of the machine to force a shoe on a last by mounting the last support in a movable manner on its carrier. The last support may be in two relatively movable parts which support, respectively, the heel and forepart portions of -a hinged last, and which, after being moved to suit the size of last are prevented from further relative movement by the thrust which results from operative engagement of the tool and the shoe bottom. In the first of two modified forms of machine described in the Specification and shown in Fig. 1 a pair of supports 23 are rigidly connected to a block 164 mounted for tilting movement about an axis at right angles to, but not quite intersecting, the axis of a last pin 22 mounted in the block 164. The bevelled inner faces of the supports 23 engage lateral edge portions of the cone of the heelward end portion of a last mounted on the pin 22 and prevent rotation of the last on the pin, and a cushion pad 27 in a channel in a block 24 is engaged by, and takes the thrust of, the friction tool 20. The sides 28 of the channel limit turning movement of the last on its pin. The block 24 is clamped between plates 160 bolted to the sides of a block 148 which is pivoted on a pin 144 extending forwards from a block 130 at right angles to a pin 128 on which the block 130 is pivotally mounted. The pin 128 is fixed in a block 124 secured at the upper end of a slide 100 above a collar 122 thereon. The bearing 98 for the slide is carried by a lever 68 similar in construction and operation to the lever 68 of the parent Specification. An adjustable stop collar 104 on the slide 100 is held against the lower end of the bearing 98 by a spring 118, and is set in such position that, on the last being moved rearwardly by depression of the operating treadle 94, the belt 20 operates on the toe end of a shoe on the last. An adjustable multiplate clutch allows the roll 32 to come to rest in the event of undue resistance being encountered. The bearing 98 is of such length that, while long enough to permit free running under normal conditions it cramps the slide 100 in a position in which the last is situated for operation by the belt on a desired point longitudinally of the shoe bottom by force exerted transversely during the operation of the belt on the bottom. The last may be held in one of a number of positions, into which it may be turned for placing a shoe thereon or for operating on the bottom of a shoe placed thereon, by engagement of a spring- pressed detent 166 in one of a number of recesses 170 in the block 164. In the second modified form which affects mainly the carrier of the machine shown in Figs. 9, 10, the forepart of the last is engaged by one member 246 of the last support and the heel end portion is supported by the last pin 212, the forepart engaging member 246 being moved relatively to the heel end engaging member 212 to suit the size of the last for shoe being operated on. The last pin 212 is carried by a block 214 pivotally mounted on a pin 226 on an extension 224 of a sleeve 218 on a pin 216. The block 246 is mounted for movement longitudinally on the block 214 within limits afforded by stops 262 and plates 254, the cone of the forepart of the last being adapted to be received in a V-shaped notch 248 in the member 246 to prevent the last from being " broken " in operation. Serrations 258 on the member 246 are normally held out of engagement with serrations 244 on the block 214 by spring-pressed plungers 260 but when the operating treadle is depressed and the last support is swung rearwardly towards the friction belt, the plungers are depressed and the member 246 is locked to the block 214 during the operation of the tool. The rod 216 is slidably mounted in a bearing in a lever corresponding to the lever 68 of the first form of machine. The machines are intended more particularly for use on slip-lasted shoes.