GB250649A - Improvements in or relating to the manufacture of cutting blades - Google Patents

Abstract

250,649. Salerni, P. M. Jan. 10, 1925. Cutlery and like blades.-In a machine for milling hollow-ground razor and like blades, particularly safety-razor blades, prior to grinding, a forged blank A is traversed by a holder C between two oppositely-rotating milling-cutters B. The base and ends of the blanks are first machined and holes A<1> are provided for engagement with conical pins C<5> in the jaws of the holder to force the base into contact with projections C<2>. The jaw C<1> is formed integral with the holder and the jaw C<3> is pivoted thereto and adjusted for engagement with the blank by a screw C<4>, the holder being fed horizontally between the cutters by hand or otherwise. The cutters are rotated about horizontal parallel axes and one is adjustable by means of a slide B<3> and screw B<5> to compensate for grinding of the teeth. Each cutter has side teeth B<1> and also peripheral teeth for finishing the surfaces of the blank as it is traversed, the teeth being arranged in the same plane and opposite each other so that the cutting pressure is balanced and chattering is avoided. In modifications a multiple holder may be employed to traverse a succession of blanks between the cutters, or a number of pairs of cutters may be mounted on parallel spindles, each pair acting on a single blank. The holes A<1> serve for locating the blade during the grinding and polishing operations and during the drilling of holes for the attachment of other parts of the razor.