Patent GB-804406-A (GB)
Title: Improvements relating to wheel dressing devices
Inventor: FUMIA ARTHUR
IPC: B24B53/08
Filed: 1956-10-10
Abstract: 804,406. Trueing devices. GLEASON WORKS. Oct. 10, 1956, No. 30906/56. Class 60. A device for trueing an abrasive wheel employed for grinding gears comprises a carrier for a diamond trueing tool mounted to have angular motion about an axis 21, Figs. 5 and 6, a cam follower 27 on the carrier co-operating with a cam 29 so as to move the carrier along the axis in time with its angular movement, and means for adjusting the cam about an intermediate point along the arc 68, Fig. 6, of angular motion of the follower. The opposite faces 23, 24, Fig. 1, of a cup wheel 11 are respectively and simultaneously trued by two dressing diamonds 14, 15 carried on the ends of a telescopic shaft consisting of a central shaft 12, Fig. 5, and sleeve member 13. The diamond 14 is supported on the shaft 12 by an arm 16, and the diamond 15 on the sleeve 13 by a two-part arm 17, 18 which can be adjusted to set the spacing of the diamonds 13, 14 along the axis 21 of the shafts. The cam follower 27 is carried at the outer end of an arm 26 secured to the shaft 12 and engages a plane surface 28 on the cam 29 which is carried by a bracket 32 in the main housing 10. The cam can be adjusted about an axis 30 to set the plane surface 28 to the desired angle relative to the axis 21 by rotating the cam in its journals 31 in the bracket 32 as desired by means of an arm 33. The bracket 32 is journalled in the housing 10 so as to be adjustable about a vertical axis 45, Fig. 6, for the purpose of setting the axis 30 to the desired angle relative to the axis 21. The sleeve member 13 is similarly provided with an arm 26 and cam follower cooperating with a cam mounted in a bracket 321, adjustment in this case being about axes 30<SP>1</SP>, 45<SP>1</SP>, Fig. 5, corresponding to the axes 30, 45. The two cam followers are urged apart and into contact with their respective cams by spring- backed plungers 39, 39<SP>1</SP> co-operating with surfaces 41, 41<SP>1</SP> on the arms 26, 26<SP>1</SP>. The arms are rocked on the axis 21 in opposite directions in engagement with their cams so that each cam follower describes an arc 68, Fig. 6, by hydraulically-actuated pistons 51, 52 having rack teeth 53 engaging gears 54 on the arms 26, 26<SP>1</SP>; the pistons are also geared together by providing them with rack teeth 55 meshing with a common gear 56. Hydraulic fluid for operating the pistons is fed by a pump through a manuallyreversible valve ; a throttle valve controls the rate of feed in the dressing direction while allowing a quick return in the opposite direction. Adjustment of the two cams about the axes 45, 45<SP>1</SP> results in the cam followers urging the shafts 12, 13 axially during rocking of the arms 26, 261 so that the diamonds 14, 15 will move along the straight lines 23, 24, Fig. 3, the pressure angles A and B depending upon the adjustment of the cam surfaces. By suitably adjusting the cams about the axes 30, 30<SP>1</SP>, the cam followers in describing their arcs can be made to impart a component of axial movement to the diamonds to produce concave or convex surfaces.