Patent GB-580814-A (GB)
Title: Improvements in or relating to machines adapted for attaching heels to shoes
IPC: A43D79/00
Filed: 1944-02-04
Abstract: 580,814. Making boots. BRITISH UNITED SHOE MACHINERY CO., Ltd., CLARKE, T. B., and RIVINGTON, A. A. Feb. 4, 1944, No. 2037. [Class 17 (i)] Heel attaching.-A machine for attaching heels by driving fastenings into the heel seat so that a part of each fastening projects, and then pressing the heel against the projecting parts, in the manner described in Specifications 552,565 and 579,680, is provided, as is the machine described in Specification 555,979, with a shoesupporting device and fastening-inserting and heel-supporting devices movable alternately into operative relation with the shoe-supporting device, and also with means for pricking fastening-receiving holes in the heel before it is moved on its support into position to be pressed on to fastenings previously driven into the heel seat. Means are provided for ensuring that the heel does not move on its support after the holes have been pricked and that the machine shall not be started by power unless a a workpiece therein is in proper operative position, and also for varying the relative amount of pressure exerted on the shoe when the fastenings are being inserted and when the heel is being pressed on to the fastenings. The machine comprises a movable frame 1 carrying a heel support 3 and a fastening-inserting device 5 either of which, as in Specification 555,979, can be positioned beneath a shoe positioned by crease-engaging clamps 235, 249 and a lastengaging abutment. The device 5 is adapted, in its right-hand position, to receive nails from a nail-feeding mechanism, e.g., nails such as are described in Specifications 522,417, 552,565 or 579,680, which are driven into the heel seat when the device is in its left hand position. The heel, support 3 is adapted in its left hand position to hold. a heel beneath a pricking device 17 and in its right hand position to press the heel on to the nails 'projecting from the heel seat. The pricking device comprises a hollow head 17 carried bv a reciprocable sleeve 15, a pressure block-33, and prickers 43 carried by a reciprocable spindle 49, the block and prickers being readily replaceable. When a heel'is positioned below the pricking device, the head 17 is pressed against the heel first by a treadle and then by power, by mechanism generally similar to that described in Specification 23031/11, [Class 17 (i)], acting through a toothed lever 61. Fig. 2. The power pressure is exerted yieldingly through a toggle 85, 83, spring 73, and rod 69 slidable in a boss 67 on the lever 61, and when it has become operative, the prickers are driven down by a toggle 135. 133, lever 117 and the spindle 49.. The latter is connected adjustably to the lever 117. The head 17 is locked in heelclamping position, while the prickers are being withdrawn, by means of a locking lever '147 adapted to engage a rib 143 on the boss 67 and operated by connections from the prickeractuating lever 117. The heel support 3 comprises a heel supporting plate in two parts 35, 37, the part 35 carrying heel clamping means and being slidable forwardly on the part 37 to facilitate the positioning of a fresh heel at the pricking station. The two parts can be locked together with the part 35 in rearward, operative, position by'a, slidable bolt 177 adapted to enter a recess 179 in the part 35 and having depending flanges 181. The latter engage the head of one arm 185 of a three-armed lever pivoted on the frame 1. A second arm 191 carries a pivoted latch 195. When the heel support 3 is moved to the left, the latch engages a pin 227 on a lever 215 and rotates the three-armed lever to unlock the bolt 177 so that the part 35 can be pulled forward to receive a heel at the pricking station. So long as the part 35 is in forward position, the end 197 of the third arm 193 of the lever overlies the rounded-end of the lever 215 and is thereby operative to prevent the power operation of the machine being started. When the part 35 has been pushed back and the power operation is started, the lever 215 is rocked to rock the lever 193 and thereby move the bolt to its left, locking, position, in which it remains, to lock the part 35 in operative position, while the heel support is moved to the right and the heel is pressed on to the nails. The crease-engaging clamps 235. 249 are carried by mountings somewhat similar to those described for the band clamp in Specification 525,959. The member 249 has a yielding part to engage the crease and a rigid face 251 to engage the upper. The members 235 have swivelling crease-engaging portions. The machine also has means for preventing power operation if the heel support and fastening-inserting devices are not in correct operative position, and a last-engaging abutment generally similar to those described in Specification 555,979. The means for moving the last-supporting abutment down first by treadle and then by power, to press the heel seat alternatively against the fastening-inserting device 5 and a heel on the heel support are generally similar to mechanism described in Specification 23031/11. The present machine comprises, however, adjustable mechanism, Fig. 2, not shown, whereby the position of the frame 1 controls the point in the power cycle of the machine at which power pressure is applied to the lastengaging abutment. The arrangement is such that pawls which co-operate with a rack on the abutment-operating lever to give it its operating stroke are held from engagement with the rack until a later stage in the cycle during fastening-inserting than during heel pressing, so that a lighter pressure is imparted to the last and shoe during the former operation than during the latter.