Device for the fine machining of optically active surfaces on, in particular, spectacle lenses

A polishing machine for simultaneous polishing of two spectacle lenses comprising:

• a machine housing bounding a work space,
• two workpiece spindles, which project into the work space and by way of which two spectacle lenses to be polished are drivable to rotate about substantially mutually parallel extending workpiece axes of rotation by a common rotary drive,
• a first linear drive unit, by which a first tool carriage is movable along a linear axis extending substantially perpendicularly to the workpiece axes of rotation,
• a pivot drive unit, which is arranged on the first tool carriage and by which a pivot yoke is pivotable about a pivot setting axis extending substantially perpendicularly to the workpiece axes of rotation and substantially perpendicularly to the linear axis,
• a second linear drive unit, which is arranged on the pivot yoke and by which the at least one second tool carriage is movable along a linear setting axis extending substantially perpendicularly to the pivot setting axis, and
• two devices for fine processing of optically active surfaces of spectacle lenses comprising a spindle shaft, which has a tool mounting section and which is mounted in a spindle housing to be rotatable about a tool axis of rotation, and an electric rotary drive, which comprises a rotor and a stator and by which the spindle shaft operatively connected with the rotor is drivable to rotate about the tool axis of rotation and the tool mounting section is axially displaceable in the direction of the tool axis of rotation, wherein the rotor and the stator of the electric rotary drive and the spindle shaft are coaxially arranged in the spindle housing, which in turn is guided in a guide tube to be capable of defined axial displacement in the direction of the tool axis of rotation, wherein the spindle shaft is constructed as a hollow shaft by way of which the tool mounting section constructed for mounting a diaphragm chuck tool, can be acted on by a fluid;
• said two devices project into the work space by their tool mounting sections each associated with a respective one of the workpiece spindles, the respective spindle housing of which is flange-mounted on the at least one second tool carriage while the respective guide tube is mounted on the pivot yoke, so that the tool axis of rotation of each of said two devices forms together with the workpiece axis of rotation of the associated workpiece spindle a plane in which the respective tool axis of rotation is axially displaceable and tiltable with respect to the workpiece axis of rotation of the associated workpiece spindle.