Patent GB-411448-A (GB)
Title: Improvements in or relating to machines for operating upon heels
IPC: A43D87/00
Filed: 1932-10-01
Abstract: 411,448. Boot - making machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., BATES, A., BARCLAY, W. R., and HAZELTON, G., Union Works, Belgrave Road, Leicester. Oct. 1, 1932, No. 11661/34. Divided on 412,599. [Class 17 (i).] Trimiming.-An unattached heel is clamped in a pivotally mounted jack and rotated to transfer the locality of operation of a rotary cutter along a surface of the heel, template means controlling the relative aspect of presentation of heel and tool to each other. A pair of templates are used, and the jack is pivoted about two axes at right-angles. A guard hood covers the tool while work is being changed, and is moved to uncover the opertive portion of the tool prior to the trimming-operation. The heel is located by a yieldable plunger engaging a recess in the attaching face of the heel. A grinding wheel is provided for sharpening the cutter, and a cam for determining the curve to which the blades will be ground. The machine column 1 carries a platform 5 on which is slidably adjustable, forwardly and rearwardly of the machine, a rectangular plate 7 clamped in adjusted position by nuts 11 The plate 7 carries a stud 23 serving as a pivot for a plate 25 provided with lugs 35, 37 which house adjustable pins with eccentric portions carrying rollers supporting a shaft 39 carrying the jack 47. The jack carries a heel clamp comprising a heel seat engaging member and a member engaging the tread face. The latter comprises a hard rubber pad 103 carried by a block screwed into a sleeve 87 journalled in bearings 89, 91 and keyed to a spur wheel 99. Keyed to this sleeve is a sleeve 81 carrying a templet 61. Within the sleeve 87 is a rod 105 carrying a pin 115 slidable in slots in the sleeve and carrying a member 112 having a cut-out portion of the shape of the tread face of the heel. This member determines the position of the heel when inserted into the clamp. On the machine being started and the wheel 99 rotated, the member is withdrawn by a cam 119 keyed to the shaft 105 and engaging a fixed cam 121. The opposing heel seat engaging member 127 is of fibre with outstanding steel points 129 and a spring-pressed locating plunger 141 engaging a jig hole in the heel. The block is supported on a member 133 screwed to a sleeve 145 itself screwed to a sleeve 143 the screw threads being such as to provide a double movement of approach or separation on rotation of the sleeve 145, which adjusts the clamp for height of heel. The member 127 is pinned to the member 133 which is keyed to a shaft 139 also keyed to a spur wheel 155. The chuck is urged to the left by a spring 173 and moved to the right to clamp the heel after this has been positioned by a handle 161 on a collar secured to cam surfaces 163 engaging fixed cams 165. A second templet 59 is secured to a sleeve 179 keyed to a shaft 55 driven from a shaft 57 in line therewith, the shaft being in two parts to permit exchange of templet. Normally, the assembly is held together by a shaft 190 having a hand-wheel 191 at one end and screw-threaded at the other to engage the shaft 57, the shaft 190 being threaded through a connecting member 185 slotted at each end for transmitting the drive. The spur wheels 99, 155 for rotating the clamped heel are driven by idle pinions 77 from the shaft 55, 57 which is rotated by a handle or a bevel pinion engaging a bevel wheel 63. The templets 59, 61 engage rolls 193, 211 respectively, on shafts adjustable toward and away from the templets by hand-wheels 203, 221, the rolls being kept in contact with the templets by springs. The cutter comprises an aluminium body 279 having three flat faces each engaging a blade 281 held thereto by a screw 289. The rear edge of each blade has a tongue 285 engaging one of a series of grooves in the body to allow adjustment to compensate for wear The cutter is positioned between screw-threaded clamping rings, its shaft being tapered at its free end and supported by a corresponding bearing in a bracket 295 slidable to allow removal of the cutter from its shaft but, normally, clamped in position by a nut 299. A hood 314 is supported by an arm 307 pivoted on a sleeve concentric with the cutter shaft, the arm 307 being, normally, urged upwardly by a spring connected to a treadle rod 319 so that on workchanging the hood is swung over the cutter. To ensure that the hood is raised, by depression of the treadle, before trimming is commenced, a collar 329 on the rod engages a pivoted arm 323 carrying a pawl 331 engaging teeth on a plate secured to the plate 25, to lock the plate against swing about the pivot 23 until the treadle has been depressed. For grinding the cutter when desired, a grinding wheel 291 is mounted on the cutter shaft, an adjacent spindle 385 holding the cutter while its blades are ground in succession. A spring plunger 392 holds the cutter against rotation, and is retracted by a handle while the cutter is rotated to bring the next blade into grinding position. The spindle 385 is adjustable about a rod 381, a scale 389 being provided to facilitate this adjustment. This assembly is adjustable towards and away from the grinding wheel by a hand-wheel 375 and is mounted on a carriage 349 guided to move vertically by rollers 353 and adjustably supported by a roll 359 engaging a cam 409. The carriage 349 is traversed horizontally by a handle 413 linked to a carriage 345 on which the rollers are mounted, the carriage 345 sliding on rails 343, 346. As the latter carriage reciprocates, a lever 419 pivoted to the column 1 causes the cam 409 to reciprocate in the opposite direction, this construction allowing the cam 409 to be longer than if fixed. A trueing diamond is adjustable in the end of an arm 433 movable by a handle 441 about a shaft 431 carried by a member 429 on a shaft 427 journalled in a bracket 425. A spring 439 urges a lug on the member 429 against the end of a screw 437 which is turned to feed the diamond inwardly during the trueing. A hood 443 covers the grinding wheel. For giving the jack a movement longitudinal of the heel during its rotation, when desired, a cam track engages a barrel-shaped member 273 carried by the rod 39. The cam is adjustable transversely of a member 239 rotatable in ball bearings and driven by universal joints and a telescopic rod from a bevel pinion 257 geared to the shaft 55. When this cam is adjusted to an eccentric position, the innermost part of the neck of the heel is higher at the sides than at the back. The size of the heel is adjusted by a hand-wheel 17, which moves the plate 7 relatively to the fixed platform 5. Adjustment of the rolls 193, 211, respectively, varies the size of the top piece and the attaching face of the heel separately. Specifications 310,822, [Class 17 (i)], and 412,599 are referred to.