Patent GB-412259-A (GB)
Title: Improvements in or relating to machines for trimming shoes or parts therefor
IPC: A43D49/00
Filed: 1932-12-23
Abstract: 412,259. Boot - making machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., Union Works, Belgrave Road, Leicester.-(Assignees of Brostrom, C. G. ; Lynn, Massachusetts, U.S.A.) Dec. 23, 1932, No. 36408. Convention date, Dec. 24, 1931. Addition to 339,258, [Class 17 (i)]. [Class 17 (i).] Trimming.-A trimming machine especially adapted to trim off folds and pleats of crimped upper material that lie on the toe ends of the insoles of lasted shoes comprises a driven band knife, means for curving the knife at its trimming portion, and shoe gauges for locating the shoe in appropriate relation to the knife. Alternate knife guiding members are provided, for causing the knife to make a convex or concave cut, for rubber or leather soled shoes, respectively. The cutting portion of the knife is positioned in the stretch moving from the driving to the driven pulley, to facilitate the curving of the cutting portion, and the knife is given a twist toward the work at the cutting point. A knife cleaner is provided, and grinding means provided with a spark quencher. The shoe gauges and knife guides are vertically adjustable as a unit but the gauges are capable of lateral relative movement so that the shoe can be thrust forward to enable the knife to operate over the whole of the toe portion. A band knife 15 passes over a pulley 16, driven clockwise, and a loose pulley 17 urged to the right by a weight 23 to keep the knife at a moderate tension. The pulleys are flanged at their rear sides and are tapered forwardly to cause the knife to hug the flanges. A cam lever 26 shifts the pulley 17 inwardly when the knife is to be removed. Guide pulleys 86 support the knife on either side of the operating part. A bracket 38 above the operating part supports a slide 34, vertically adjustable by a screw 40, and carrying the knife guiding members. For making a convex cut, a finger 31 below the knife and a member 32 above it are clamped by a screw 35. The bracket 38 is adjustable forwardly and rearwardly by a screw 46 and carries a slide 50 supporting the shoe gauges. The slide is urged forwardly by a spring 52 and is provided with adjustable stops 55, 56 engaging leather plugs to determine its extreme positions. A felt pad 60 engages the toe end of the shoe, tongues 68 on either side of the finger 31 engage the toe margin, a member 77 engages two opposite marginal points of the ball portion, and a post covered by a rubber tube 73 supports the shoe against the drag of the knife. These members move rearwardly with the shoe as this is fed against the knife by the operator. When it is desired to make a concave cut, the members 31, 32, 68 are substituted by others shaped accordingly and the bracket 34 is lowered to deflect the knife into concave form at its operating part. The guide pulleys 86 are tapered to twist the knife so that its edge may penetrate the work. Beyond the work the knife is cleaned, an inclined scraper blade being followed by felt pads above and below the knife fed with water from a reservoir 93. The upper pad is weighted to exert a frictional drag on the knife. A grinding disc 104 may be brought into contact with the knife when desired by operation of a screw 124. The grinding disc is driven by belts and carried by an extensible arm so that it can be adjusted rearwardly as the knife wears. To extinguish sparks, a felt pad 135 supplied with water from the reservoir 93 is carried by a brass strip adjustable toward the disc by a screw 143. The felt dips into a well positioned to catch falling sparks. Below the disc, a block 145 supports the knife and carries a roll engaging its rear edge. The grinding mechanism is covered by a removable cowl.