Patent GB-727202-A (GB)
Title: Improvements in or relating to skiving machines
IPC: C14B11/00
Filed: 1953-03-26
Abstract: 727,202. Skiving-machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). March 25, 1954 [March 26, 1953], No. 8335/53. Class 31 (1). A skiving-machine, more particularly for preparing the edge of a shoe upper part for a folding operation, comprises a feed roll 10, Figs. 1 and 8, having a ridge and narrow rim 14 over which the margin of the work-piece W can be abruptly bent by means of a presser foot 22 whereby the work-piece is given a well-defined bend close to its edge and adjacent the position of operation of a tubular cutter 24; the cutter is then effective on each side of the bend so as to leave a feather portion 28, Fig. 6, which straightens out into the upper dotted-line position after cutting. The rim 14 of the feed roll joins a frusto-conical portion 16 and forms with it an obtuse-angled ridge, and the presser foot has its work-engaging face substantially complementary to the sectional form of the rim 14 and portion 16 of the feed roll. The feed roll and presser foot, together with an edge gauge 18 and feed disc 26, are carried by a frame 70 which is adjustably mounted so as to present the operating members in correct relation to the cutter. The frame is angularly adjustable to vary the taper of the feather portion 28 by reason of the engagement of an arcuate groove 114 in the frame with a similar rib 116 on a slide 118; the slide is adjustable vertically in an upright 122 which can be adjusted to and from the cutter in a guideway 128. The presser foot is pivoted at 20, Figs. 1 and 8, on the edge gauge 18 and urged towards the feed roll by a spring 152a, adjusted by a thumb-screw 154. The edge gauge has its work-engaging face disposed adjacent the end face of the feed roll and a throat portion 144 which guides the work-piece up to the workengaging face as it is fed over a projection 150 of the gauge. Provision is made for adjusting the position of the gauge and presser foot by mounting the gauge on a plate 162 which is slidable on a rib 166 arranged to be angularly adjusted on a plate 168 hinged at 170 on the frame 70; screws 171, 177 with knurled clampnuts secure the rib 166, plate 162 and plate 168 in desired position. The feed disc 26 is fixed on a shaft 72 which is rotatable in a bracket 76 mounted by means of a slide 78 on the frame 70 for adjustment axially of the roll. The shaft 64 of the feed roll is rotated through a belt-drive 60 from the output shaft of a driven reduction unit 52, an adjustably-mounted idler pulley maintaining the tension of the belt drive in the various positions of adjustment of the frame 70. The shaft 72 of the feed disc 26 is driven from the shaft 64 through gearing and shafting 84 ... 92, spring-urged friction clutch 98, gearing 104 and spring 110 connected to a collar 112 adjustably fixed on the shaft 72; the spring 110 and clutch 98 constitute a yielding drive which reduces the tendency of the work-piece to become jammed. The cutter 24, Fig. 7, is screwed into a sleeve 32 which is rotatable in a housing 38, being driven by a belt drive 44 from the input shaft of the reduction unit 52. Waste material arising from the cutting operation is withdrawn through a tube 174, Fig. 7, adjustably mounted in the sleeve 32 and reaching almost to the cutting edge, the material being blown into the tube by an air stream directed past the cutting edge by a nozzle 176, Fig. 1, carried by a plate 178 hingedly mounted on the frame 70 so as partially to cover the end of the cutter; a flexible tube connected to the end of the tube 174 conveys the waste to a storage chamber. The cutting edge of the cutter is sharpened by a grinding-wheel mounted on the shaft of a motor 194 carried by a slide 190 which is so constructed as to provide for adjusting the motor and grinding-wheel both axially and laterally of the cutter. The subsequent folding operation on the skived edge may be effected as described in Specification 687,861.