Patent GB-339258-A (GB)
Title: Improvements in or relating to the trimming of heel covers and the like
IPC: A43D27/00
Filed: 1929-09-03
Abstract: 339,258. British United Shoe Machinery Co., Ltd., (United Shoe Machinery Corporation). Sept. 3, 1929. Trimming.-A trimming - machine comprises driven flexible cutting means and means for flexing a trimming portion thereof. For bevelling the marginal portions of a. cover which has been applied to a heel at the parts which overlap the edges of the breast and attaching faces, a band knife 22 passes over a pair of drums one of which is driven and the other mounted in a sliding bearing urged away from the driven drum by a suspended weight. Pulleys 76, Fig. 2, support the knife on each side. of the operative position, between which pulleys it is flexed by a pressure foot 124, Fig. 4, adjustable, vertically by a thumb nut 128 engaging a screwed shank carrying the foot. The foot is adjustable across the width of the knife, the shank and adjusting nut 128 being secured to a slide, 134 adjustable by a thumb nut 138 and clamped in adjusted position by a nut 142. The work is guided by gauges engaging the breast and side edges, the gauges being carried by members 150, Fig. 2, pivoted on the shafts of the pulleys 76 and adjustable about these pivots by thumb nuts 158. Each breast gauge 162 is adjustable, vertically by a thumb nut 176 and widthwise of the knife by a thumb nut 188, the gauge being normally positioned just in advance of the cutting edge. The side gauges 164 are each carried on a slide slotted at 204 to be guided by part of the member 150, a pin 218 on each slide engaging a slot 220 in one of a pair of plates 222 the ends of which are slotted and overlap to engage a pin 228 guided by a vertical slide 236 operated by a lever 238 linked to a treadle. On depression of the treadle, the side gauges are moved toward each other to centralise the work in relation to the flexed portion 26 of the knife. Normally, the cut is commenced at about the middle of the breast, and the heel reversed for the second half of the breast trimming operation. To enable the knife to reach the extreme end of the tread when the heel has an attached top lift 250. Fig. 7, projecting beyond the breast face, a lever 254 is provided on the right-hand member 150. This lever is normally held in inoperative position by a spring, but when swung by the operator, as indicated, a thimble 258 on the lever engages the back of the knife and causes this to advance under the gauges 162 to complete the cut. For bevelling the edges of the cover on the attaching face, the foot 124 is substituted by an off-set foot 270, Fig. 9, and the left hand roll 76 by a larger roll 271. The bevel can then be cut progressively from one breast corner to the other around the sides and end of the heel. The knife may be long enough to span several operators positions, sets of gauges and flexing means being provided at each position. Along its upper run the knife is encased and passes through cleaning material. A scraper 80, Fig. 2, engages opposite sides of the knife after it has passed the operator's position to remove material which may stick to the knife. A grinding wheel may be brought into contact with the knife when required. According to the Provisional Specification the tension of the band knife may be adjusted by a screw engaging the sliding bearing; the pressure foot may engage the knife by a roller, and may carry a guard bevelled to register with the cutting edge of the knife; the rollers 76 may be adjustable along the path of the knife; vertical guide rollers may be provided; a work gauge may comprise a horizontal bar carrying a rod at an angle to the vertical, the heel being held against the end of the bar and the rod, the gauge being movable during operation by a knee or foot lever.