GB354729A - Improvements in or relating to centerless grinding machines - Google Patents

Abstract

354,729. Centreless grinding. CINCINNATI GRINDERS, Inc., 3058, South Street, Cincinnati, Ohio, U.S.A.- (Assignees of Johnston, G. V. ; Loveland, Ohio, U.S.A.) May 12, 1930, No. 14574. Convention date, May 20, 1929. Addition to 309,413, [Class 60, Grinding or abrading &c.]. [Class 60.] A centreless grinding machine for grinding headed articles, or articles not readily introduced axially, has a pivoted head, adjacent the work rest, which lifts a work-piece from a table and positions it upon the work rest, and also, after grinding, removes the work. The machine consists of a base 10 upon which is mounted a grinding-wheel 12 and a slide 14, upon which is slidably mounted a regulating-wheel unit 15 carrying a wheel 17. On the slide 14 is mounted a bracket 18 having adjustably secured thereon, by bolts 21, a workrest blade 20, and supporting, adjacent the grinding-throat, a table 23 carrying undercut guides 24. On a spindle 25 mounted in the bracket 18 is a work-head 28 having therein a slot 29 and a recess 30, so that a valve head 31 placed on the table 23 and slid along the guides 24, moves into the recess 30 and, by rotation of the head, is moved to carry the valve stem 32 to rest on the blade 20 where it is ground; after grinding, the head 28 is rotated to lift the valve stem from the blade 20. The spindle 25 is rotated by a pinion 26 engaged by a rack 34 secured to a slidable rod 37 moved in one direction, to position the work between the wheels, by a spring 39, and in the opposite direction by a crank pin 43 on a rock-shaft 44. The rock-shaft is actuated, in timed relation to the in-feed of the regulating wheel, by a cam projection on a cam which moves the regulating wheel, the cam and a driving motor therefor being located in a casing 46.