| 摘要 |
To center optic lenses in a mechanical mounting, in particular during edge cutting and bevelling, the invention includes a device with a housing (10), in which a motor drive (M, R) acts through a torque part (50), drive shafts (14, 14') and drive elements (16, 16') onto aligned centering spindles (18, 18'). These are arranged in guide bearings (22, 22') on projecting parts of the C-shaped housing (10) and are constructed as air bearings. In this manner, it is possible to hold the clamping angle ( alpha ) on the lens (L) in the range below 2x8 DEG , preferably below 2x6 DEG . In particular the lower centering spindle (18) is smoothly axially adjustable in the air bearing (22), for which purpose axially parallel and/or partial-ring-shaped grooves (90) are provided at the ends of a thin-wall guide sleeve (76), between which ends peripheral air-cushion fields build up when pressurized air is being supplied. The axial closing of the clamping spindle (18) is done by a clamping device (24) having a crossbar plate (26) and a membrane piston (32).
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