Patent GB-190911472-A (GB)
Title: Improvements in Machines for Skiving Leather and the like.
Inventor: BOULT ALFRED JULIUS
IPC: C14B1/00
Filed: 1908-07-24
Granted: 1909-10-25
Abstract: 11,472. Boult, A. J., [Booth, Q. W.]. July 24, 1908. Skiving &c.-In a leather or like skiving-machine of the type comprising a rotary disk cutter and an angularly adjustable rotary work support, the mechanism by which the work support is driven comprises a friction clutch, one of the members of which yields in the first instance to check the initial speed of rotation of the work support. The supporting-surface of the work support is of concave formation to ensure an absolutely rectilinear cut, and, to vary the inclination of cut, the support is tilted angularly about an axis near to the outermost edge of the stock and at or just beyond the radius of the outer circumference of the work support. Other improvements relate to the use of a spring- pressed segmental presser-finger which is adjustable circularly around the cutter, and a guard disk which is adjustable longitudinally of the worksupport. The work-support S is secured on a shaft 184 which passes through a carrier 180 and an extension 182 thereof. This carrier is mounted for angular adjustment within a chamber 178 by the engagement with a curved channel 190 in the carrier of a curved guiding-flange formed in the rear part of the chamber 178. The curvature of the channel 190 is that of a circle struck from a centre X in the front face of an edge gauge 232, which is secured to the upper outer edge of the carrier 180 and adjacent to the edge of the worksupport S. The adjustment of the work-support is effected by the rotation by means of a handwheel thereon of a spindle 198 passing through the carrier extension 182, this spindle being provided with a pinion 196 adapted to engage with, and travel up, a curved rack bar 194. A butterfly nut on the spindle 198 serves to clamp the actuating hand-wheel, and so secure the work-support in its adjusted position. The shaft 184 carries a gearwheel 186 and is engaged by a worm 214, Fig. 4, on a shaft 206 which is rotated from the main driving-shaft by a belt 226, which passes round the lower member 220 of a friction clutch 216, 220, actuated by a treadle-operated lever. The member 216 is resiliently supported, as shown in Fig. 4, so as to secure for the shaft 206, and consequently for the work-support S, a slow but gradually increasing speed of rotation when the coupling is effected. The surface of the work-support is such as would be generated by the inter-section of the revolving work-support with the circular knife when the work-support is adjusted to its least angle with the knife. To assist in the feeding of the material, a guard-disk 296 on a spring-pressed shaft 294 loosely mounted in a sleeve 292 is provided. This disk is kept in engagement with the material on the work-support by an adjustable spring 300, and is frictionally rotated by the moving material. To permit adjustment of the guard-disk longitudinally of the work - support, the shaft 286 which carries the sleeve 292 is loosely mounted in a cylindrical bearing 284, and may be clamped in position longitudinally thereof by the device 290, 288. A spring-controlled adjustable segmental presser-finger 252 serves to keep the material down on the work-support as it passes to the knife, In a modification shown in Fig. 14, the presser-finger 322 is so mounted as to be adjustable circularly around the knife.