GB206218A - Improved means for grinding or polishing file, cutlery and other blanks - Google Patents

Abstract

206,218. Moore, F. July 31, 1922. Files and file blanks, treating; cutting-edges, shaping and treating.-A machine for grinding and polishing file, cutlery, and other blanks comprises a circular worktable 1 rotatably supported on slides or rollers on a standard 2 which also supports the spindle of a grinding-wheel 3. On the grinding-wheel spindle is a bush 6<a> carrying a loose pulley 6 and a fast pulley 5 which rotates the table through gearing 7, 8, 9. The blanks are supported, singly or in sets, by holders 11 adjustable on slides 13 adjust ably carried by vertical spindles 14 slidable vertically in bearings 14b in the table, a series of slides being arranged around the table. The bearings 14<b> have caps 14<a> or loather or rubber covers or felt rings to protect them against swarf or water. The spindles carry rollers 15 bearing on a cam 16 clamped to a disc 18, which is supported by a pendant pin 17 hung from the table; each holder is associated with a pin 17 and cam 16, the form of the various cams being the same or different according to the form required for each set of blanks. On the disc 18 is an arm 19, the radial position of which can be adjusted, the arm engaging once in each revolution of the table, when the blanks are passing beneath the grinding-wheel, with a fixed tappetpin 20. The consequent rotation of the cam 16 causes the spindles 14 to rise or fall, and thus give the required form to the blanks; on release ot the arm 19 from the pin 20 a spring 21 returns the arm to the normal position. Beneath the arm 19 is a disc 22 having two projections resting on a feed cam 23, which is clamped to a sleeve 24 carried on the pin 17, and fixed to the sleeve are detachable projecting arms 25. As the table rotates the arms engage a bracket 26 on the standard 2, causing partial rotation of the feedcam and a corresponding upward feed of the blanks; the arrangement may be such that after five revolutions of the table, and five feeds, the blanks are finished, the cam being shaped to allow the blanks then to fall clear of the grinding- wheel, and a short arm 25 being presented to the bracket 26, no action takes place. When a quicker feed is required, a second set of arms, operating similarly with a bracket 27, may be provided on the sleeve 24. The relative positions of the disc 22 and cam 23 may be reversed. To compensate for wear of the grinding-wheel, a hand-wheel 28 screws on the pin 17 to lift the cam gears. Water or other cooling medium is supplied by a pipe and runs away to the inside of the standard through holes 39, 40. In operation, as the table rotates, the sets of blanks come successively beneath the grinding-wheel. When complete]y ground the blanks are turned over to present unground faces, or replaced by other blanks. The holders may be detachable; the grinding-wheel may be on a separate standard. The table may have a to and fro rotating or semirotating movement or may have intermittent rotation.