Patent GB-926661-A (GB)
Title: Improvements in or relating to machines suitable for operating on shoe heels
Inventor: MURPHY BRIAN JULIAN MAURICE
IPC: A43D87/00
Filed: 1958-03-27
Abstract: 926,661. Heel trimming machines. BRITISH UNITED SHOE MACHINERY CO. Ltd. June 25, 1959 [March 27, 1958; June 19, 1959], Nos. 9800/58 and 21059/59. Class 17 (1). A machine for operating on shoe heels comprises a work support having a last peg, means to co-operate with positioning means on a last to orientate the last above the last peg, and a readily detachable template positioned in relation to the last peg, a tool support including a member co-operative with the template, and means whereby relative movement may be caused to take place between the heel of a shoe on a last on the work support and the tool so that the tool operates progressively around the periphery of the heel under the control of the template. The work support includes a last pin with a further pin to engage a further hole in the last, or with a further two pins to engage positioning means on the last. In the construction shown in Figs. 1 and 2 the work support is carried by pivoted arms 30, 26 which are adjustable laterally on shaft 18 to locate the counter guard 8 at the crease of the shoe. The last is normally locked to the last pin 40 by means of a tapered spring-pressed plunger 48 which is slidable in the last pin and presses balls 50 outwardly of radial holes in the pin into locking contact with the thimble of the last. For loading and unloading the last the plunger is moved against spring 46, to release balls 50, by endwise movement of a rod 52 by means of handle 54. The detachable template 66 is mounted on the last pin 40 and has two further holes through which pass pins 64 which are carried by the template locating plate 62 and engage the faces of a positioning plate on the last. The template is engaged by a freely rotatable follower roll 68 coaxial with, and of the same diameter as, the cutter. An adjustable spring-pressed plunger 70 engages the tread face of the heel to take up any play in the work support. In the construction shown in Fig. 3 pins 64 and the positioning plate are replaced by a single pin 82 which is carried by the locating plate 80 and engages in an auxiliary hole in the last. To permit offset heels to be trimmed the template is adjustable about the last pin by means of a screw 90 passing through a slot 88 in plate 80 into the template, the hole 84 in the template being larger than pin 82 to permit this adjustment. When the upper is bunched at the rear of the hub seat, causing canting of the heel, a cam arrangement may be fitted to parts 20, 14, to cause the work support and last to be moved to the right, Fig. 1, as the last is turned. In the construction shown in Fig. 7, the work support is carried by a single laterally adjustable arm. The work support 140 includes a shaft 142 carrying the locating plate 150 which in turn carries a last pin 154, a subsidiary plate 158 with a pin 160 to enter an auxiliary hole 162 in the last and a template 164 with a cut-away portion 172. The shaft is normally urged leftwardly, Fig. 7, by spring 148 to an inoperative position in which plate 150 engages face 176, but is moved to the operative position shown by manual movement of lever 178 to the dotted line position, when the rim 106a of the counter guard may be engaged in the crease of the shoe and hold the shoe and last in the operative position, and lever 178 being returned by spring plunger 183. In the position shown the last is locked to the work support by means of spring 188 acting via tapered plunger 190 and balls 194, but in the inoperative position of the supporting unit plunger 190 is moved to the right by engagement with face 176 to release the locking means. To permit the last to be oriented about the last pin 154, plate 158 is slotted as at 170 for the passage of screws 166a, 166b, 166c securing plates 150, 158, 164 together. Thus by first slackening the screw plate 158 with pin 160 can be adjusted about the last pin, scales on plates 150, 158 indicating the adjustment. When the supporting unit is at the inoperative position, removal of the last is facilitated by rotation of hand lever 218 which acts via cam 216 to move rod 210 endwise to push the last from the unit. In a further construction pin 160 is replaced by a pair of pins which pass through the cutaway 172 and engage a positioning plate on the last, i.e. as in Fig. 2. Specifications 15092/1908 and 863,464 are referred to.