Patent GB-448027-A (GB)
Title: Improvements in or relating to the scraping, planing or cleaning of metal and other surfaces
IPC: B23D1/00
Filed: 1934-11-23
Abstract: 448,027. Planing or milling strip material. MALAM, J. E., 249, Brandwood Road, Kings Heath, Birmingham, and IMPERIAL CHEMICAL INDUSTRIES, Ltd., Millbank, London. Nov. 23, 1934, No. 33767. [Class 83 (iii)] [See also Group XXIII] In a machine for scraping, planing, grinding or milling the surface of plate or strip material, the tool which moves longitudinally relatively to the material is rigidly mounted with a roller or like engaging the surface, the roller being mounted substantially on the centre line of the tool and being resiliently urged against the surface to control the depth of cut. The invention may be applied to the treatment of copper or copper alloys, nickel and its alloys, aluminium and its alloys, zinc and its alloys, iron, steel, ebonite or plastic materials such as synthetic resins or cellulose derivatives. In one form, a metal table 1 is composed of a number of bolted up sections and a stack of hot rolled brass strips 3 is arranged so that the top sheet may be fed to the table over rollers 4 on a frame 5 adjustable from a hand wheel 8 and screw 9. The strip is secured at one end by a number of clamps 12 fixed in a transverse table groove 13. At the other end the adjustable clamps 4 comprise eccentric grooved rollers 18 and are operated by hydraulically-actuated rods 19, which are moved away from the strip to rotate the rollers 18 and grip the strip. Wedges may be used instead of the gripping rollers. A travelling tool carriage 22 has wheels 23 running on inlaid rails 24 and has also vertical rollers 25 engaging the sides of the table to prevent lateral movement. The carriage is provided with vertical tool posts 27 comprising a tool 28 secured by a wedge 36 and a roller 29 engaging the work, the tool and roller assembly being pressed downwards by a spring 30. A micrometer 35 is provided for adjusting the amount of projection of the tool beyond the roller to determine the depth of cut. The tool is set obliquely so as to direct the cuttings outwardly from the work. The carriage is traversed along the strip by means of a wire rope 41 which is wound round a drum 42 driven by a motor 43 and passes over end pulleys 47, 46, a tensioning device being provided at 49. The carriage travel may be determined by automatic limit switches. The rails 24 are elevated at the ends so as to lift the carriage at the end of its travel and apply the tools to the cut without shock. During the backward travel the tools may be lifted clear of the work by means of arms 56 carrying rollers 52 which trail in the full line position, Fig. 4, on the operative stroke but at the end of the stroke the rollers ride down inclines 55 and swing into a vertical position against an abutment to maintain the carriage in raised position during return. In a modification, the carriage-raising rollers may ride on elevated rails attached to the table frames. On completion of a cut the strip is unclamped and moved laterally by hand by the width of the cut until the whole surface has been treated. A V-shaped brush 58 or a rubberized canvas member may be arranged to remove swarf from the strip surface. The strip may be turned over to treat its opposite side. In a modification the tool holders may be fitted with automatic cross-traversing means instead of moving the strip laterally. In another modification, Fig. 8, a number of cutting tools 60 with coacting rollers are arranged in staggered formation in a fixed holder to cover the whole width of the strip which is uncoiled from a drum 63, passes through pinch rolls and straightening rolls 65, and is then drawn past the tools on to a drum 68 driven by a motor. The tool assemblies are pressed downwardly by springs 77 arranged beneath a hinged plate 78 held down by a screw 81. In this form the strip may be carried on a moving table consisting of a travelling belt. In some cases rotary cutters or grinding wheels may be employed. Such cutters or grinding wheels may be journalled in tool posts associated with work-engaging rollers as described above and mounted either in a travelling or a fixed carriage. The wheels are driven from one or more electric motors by flexible or belt drives.