Improvements in and relating to apparatus including a tool for milling shears with profiled teeth

摘要

849,159. Making pinking shears; tools; face-plates. BRISKMAN, S. Jan. 18, 1957 [Nov. 2, 1956], No. 1977/57. Classes 83 (2) and 83 (3). [Also in Group XIV] Apparatus for cutting teeth on a pinking shear-blade 32, Fig. 8, comprises a support 27 for rotating the blade about its pivot-point, and a tool 33 comprising a cylindrical body having a series of annular grooves in its periphery and a recess transverse to the grooves and defining a profiled cutting-edge. A blade blank 32, Fig. 8, is mounted on an inclined holder 28 on a face-plate 27 by a clamp 31 acting on the pivot-point, and a clamp 30 acting on a lug 29 which is subsequently removed from the blade. The tool is mounted on a rod 37 and is clamped by screws 43, 44 so that the cutting- edge 41, Fig. 15, which makes an acute angle with the tangent plane T, is perpendicular to the face-plate (R). The tool is fed in gradually on a slide 42. By repositioning the blade, the blade teeth may be chamfered as at 26a, 26b, Fig. 7. The tool is sharpened along lines 41SP1/SP, 41SP11/SP, Fig. 15, and when this is no longer possible, new grooves are cut and a tool of smaller diameter is produced. The grooves may be of any configuration, and the tool may be composed of discs 236, Fig. 14, secured together by bolts 246. Complementary edges 123, 223, Figs. 5, 5a, are formed on the parts of material cut by the shears of Fig. 3, and consequently, the handles are made of identical shape so that the shears may be reversed conveniently in use. Specification 849,160 is referred to.