Abstract: Arrangement for releasably fastening a grinding wheel or a group of grinding wheels on a wheel spindle, for example, a group of grinding wheels in a spectacle-lens-edging machine. The machine has a grinding-wheel-retaining shaft that is arranged, in an axially displaceable manner, in a coaxial bore of the wheel spindle, a retaining disk that may be fastened in a releasable manner at the free end of the grinding-wheel-retaining shaft, and clamping elements arranged between the wheel spindle and the grinding-wheel-retaining shaft for axially bracing and releasing the grinding wheel or the group of grinding wheels between the wheel spindle and the retaining disk.

Abstract: The invention relates to an installation for the machining of the edges of spectacle lenses, comprising at least one CNC-controlled processing machine (1) for machining a spectacle lens, at least one device (3, 4) for determining the optical values, the optical focus, the axis position of a cylindrical or prismatic polish, the position of the near portion and/or the position of a progression channel of a spectacle lens (6) that is configured as a continuous vision lens. The installation also comprises at least one handling device (9) for removing blanks (6) from a conveyer device (8), for inserting a blank into the device, for removing said blank from said device, for introducing a blank into a respective processing machine, for removing a finished machined spectacle lens from the respective processing machine (1) and for replacing said lens on the conveyer device (8).

Abstract: Retaining device (1) for a block or suction element (10) in a centering device for spectacle lenses, having a support, which has a longitudinal axis (2), having a spherically dome-shaped bearing surface (3) on the support, having a spherical dome (5), which is mounted cardanically on the support and is complementary to the bearing surface, having a holding element (6) in the spherical dome for the block or suction element with a contact surface (11) for the spectacle lens, and having a radius (R) of the bearing surface and of the spherical dome, the mid-point (M) of which is located on the longitudinal axis of the support (1) on the contact surface for the spectacle lens.

Abstract: The invention relates to a method and a device for machining the peripheral edge of spectacle lenses and for optionally applying a subsequent facet thereto. The device comprises a driven spectacle-lens holding shaft which holds the spectacle lens and a machining tool which can be moved in a controlled manner in relation to the spectacle-lens holding shaft. The torque of the spectacle-lens holding shaft is measured and said holding shaft is driven at a constant rotational speed if and for the length of time that the torque is less than or equal to a predetermined value. The torque of the spectacle-lens holding shaft is decreased optionally to a standstill if and for the length of time that the torque exceeds the predetermined value.