GB855250A - Means for feeding elongated workpieces to and/or from a centreless grinding machine - Google Patents

Abstract

855,250. Centreless grinding. CLIFFORD MACHINE TOOLS Ltd. Sept. 2, 1959 [Sept. 8,1958], No. 28718/58. Class 60. Means for feeding elongated workpieces 10 Fig. 1 into and removing from a centreless grinding machine of the kind having a work seat 9 between the grinding wheel 6 and a control wheel comprises at least one frame 22 adapted for connection to the main slide 7 and to extend therefrom below the work, antifriction bearings 17 supporting the frame for movement with the slide 7, a plurality of spaced pairs of power-driven work-supporting rollers 33, and means for locking the ends of the frame remote from the slide against lateral movement. The axes of each pair of the rollers 33 are so arranged relatively, that they move the workpiece carried between them at an axial speed through the grinding throat substantially equal to the rate for which the control wheel is set, the rollers being positively driven by a motor 37, gearing 34 and shafts 35 and 26, the former being splined to permit vertical adjustment of the frame 22. A bridge-piece 14 secured to the slide 7 and extending laterally therefrom has secured at one or both ends the lower member or members 16 of the frame or frames, if work-supports on both sides of the slide are required. Each end of the member 16 is supported on a pedestal 18 having an accurately machined transverse surface 19, with levelling screws 20, for the bearing rollers 17. Jacks 21 operated by a handwheel 23, shafts 24 and rack and pinion mechanisms 25, 26, Fig. 3, raise or lower the frame member 22, with the work 10, relative to the work-rest 9 and the lower member 16. Slotted arms 27 depending from the member 22 and clamped by levers 30, 31 and bolts 28, 29 to secure the frame members together after adjustment of the work. Lateral movement of the outer end of the frame is prevented by a clamping device 38, which is mounted on the outer pedestal 18, and is operable from a position adjacent to the adjusting means of the slide 7 by electro-magnetic or fluid pressure to close the clamp on to a cylindrical member 39 extending transversely of the frame member 16. The slide 7 carrying the work-rest 9 may be locked in position on the machine bed 5, the control wheel being carried by a second slide which is movable to or from the grinding wheel 6 and lockable to the slide 7, the control wheel being mounted on the slide for angular adjustment relative to the axis of the grinding wheel to determine the rate of feed.