Patent GB-668204-A (GB)
Title: Improvements in or relating to machines for trimming the margins of shoe uppers
Inventor: BARKER WILLIAM ARTHUR
IPC: A43D23/06
Filed: 1949-08-24
Abstract: 668,204. Shoe-upper trimming machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. Aug. 23, 1950 [Aug. 24, 1949], No. 21979/49. Addition to 622,357. Class 17 (i). Comprises detail improvements in the machine described in the parent Specification for trimming unwanted material from toe of shoe which has been pulled over but not yet lasted wherein the upper margin is lifted and out-turned at opposite sides of the toe over a shearing block across which a pair of disc knives advance to cut the material, whereby (1) the disc knives are ad justable to and from one another, e.g. for compensating for reduction in size due to re-grind ing, (2) the out-turning members for the shoe upper margin are adjustable widthwise of the machine in accordance with the shoe width, (3) a lining member for the shearing block is adjustable so that the depth of cut of the trimming knives, which depends on the stoutness of the upper material, may be varied, (4) the heel-end abutment of the machine and the carrier for the disc knives are moved to out-of-way positions, at the end of the trimming operation, where operator's view and rearward movement of disc knives are not obstructed. The illustrative form of the machine operates in very similar manner to that of the parent Specification. The shoe is presented to the machine, bottom up, by the operator so that the bottom engages a shoe bottom abutment plate (corresponding to that referred to as 5 in the parent Specification), and an insole engaging roll 213, Figs. 1, 8, which limits the upward movement of the knife carrier 77, Figs. 7, 8, the toe fitting snugly into the shearing block 1 which has been adjusted to the toe shape. On depression of the operating treadle, the roll 213 is raised to shoeengaging position where it is locked against upward yielding, due to thrust which occurs when the knives 69 cut into the upper material. The clutch is prevented from being tripped until the heel end abutment 297 bears firmly against the shoe so that the machine may not be started when no shoe is in position in the machine. Wiping plates, similar to those referred to as 9 in. Specification 539,234, which are thrust upward by 'power operated means in contact with the shoe and between the toe and the inner lining members 47, 49 of the shearing block 1, at about the time the heel end abutment 297 is urged rearwards by power operated means, prevent the pulled-over upper from returning to its unstretched condition.. The heel end abutment 297 is caused to descend from its inoperative out-of-the-way position and move rearwardly to hold the shoe against the locating devices, and the clutch engaged by movement of a hand lever. The abutment 297 is then power operated to hold the shoe, and the wiping plates are thrust upwards to hold the upper, and the carriage 77 which supports the knives 69 is moved idly forward in an elevated position with the knives rotating and the outturning members 149 making rapid "pawning movements, until, at the end of the idle stroke in the most forward position, the carriage 77 is lowered and returned on its operating stroke to cause these members to lift the upper margin at the sides of the toe and turn it outwardly over the upper surfaces of the inner lining members of the shearing block 1. The members 149 are relatively adjustable inwardly and outwardly. Upper pressing rollers 209 and fingers 193 follow the out-turning members 149 closely, the latter turning back the upper margin at the point of the toe, the outturning members 149 having been moved into an elevated inoperative position. The knives 69 follow clearly on the fingers 193 to trim away the surplus upper material. The insole engaging roll 213 returns to its forward position from an inoperative position out of th'e way of the knives and the sliding carriage 77 is raised, as the machine comes automatically to rest. Removal of pressure on the treadle enables the operator to free the trimmed shoe from the machine.