| 摘要 |
An apparatus for the surface machining of the workpieces by grinding, polishing, lapping or the like, comprising a frame, a lower and an upper working wheel supported by the frame, at least one thereof being rotatably driven by driving means, at least one runner wheel between the working wheels, that runner wheel having apertures for the accommodation of the workpieces and having further teeth at the circumference thereof, an inner and an outer ring radially outwardly and radially inwardly of the working wheels, respectively, adapted to accommodate a row of circularly arranged pins, at least the outer pin ring being rotatably supported by the frame and driving by second driving means, the runner wheel camming with the outer and the inner row of pins, the improvement being characterized by the pin ring being rotatably supported by an outer annular bearing ring stationarily supported by the frame through a plurality of circumferentially spaced rollers, the rollers being rotatably supported by the bearing ring about a stationary axis, the cross section of the circumference of the rollers being conically shaped and the pin ring having a circumferential groove conical in cross section and cooperating with the circumference of the rollers.
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