| 摘要 |
To centre optical lenses for mechanical clamping, especially during bevelling and facetting, the invention proposes a device with a housing (10) in which a motor drive (M, R) acts via a torque divider (50), drive shafts (14, 14') and transmission elements (16, 16') on centring spindles (18, 18') in alignment with one another. The latter are arranged in guide bearings (22, 22') on projecting parts of the C-shaped housing (10) and are designed as an air bearing. The clamping angle ( alpha ) at the lens (L) can thereby be kept in the range below 2 x 8 DEG , preferably below 2 x 6 DEG . The lower centring spindle (18) in particular is axially adjustable in a free-running manner in the air bearing (22), for which purpose axially parallel and/or index-ring-shaped grooves (90) are provided at the ends of a thin-walled guide sleeve (76), between which peripheral air-cushion zones build up when compressed air is supplied. The axial infeed of the clamping spindle (18) is effected by a clamping device (24) with a yoke plate (26) and a diaphragm piston (32). …<IMAGE>… |
