GB918617A - Improvements in knife grinding devices for cigarette machine cut-offs - Google Patents

Abstract

918,617. Grinding cigarette-machine cutters. MASON, J. A., and MOLINS MACHINE CO. Ltd. May 9, 1961 [June 23, 1960], No. 21983/60. Class 60. A grinding device for the sickle-shaped knife 20 of a cigarette cut-off machine comprises a convex-faced disc 21 which has fine abrasive material applied to its convex face in spaced whorl-shaped patches 21a extending in generally radial direction and increasing in width from the inner to the outer ends, and means for rotating the disc at a speed such that the sickle edge of the knife contacts abrasive throughout its length when passing across the disc. A second, similar, sharpening disc 30, Fig. 1, is provided for burr removal; this may be rotated by contact with the knife or mechanically driven. The main disc 21 is driven in timed relation with the cut-off. The knife 20 is mounted on an adjustable carrier 14 which is pivoted at 15 to a fork 16 on a shaft rotatable in an adjustable bearing-block 18 whereby the traverse of the knife may be varied; an adjustable support 26A permits corresponding repositioning of the disc 21 relative to the knife 20. Suitable natural or artificial abrasives are diamond dust, emery, carborundum, aloxite, tungsten, corundum, tungsten carbide powder, or powdered diamond and other precious stones. They may be attached to the disc by an electrolytic process in which the particles are embedded in electrically-deposited metal. Specification 324,379 is referred to.