Patent ID: 8550883

Claim:
An apparatus for machining a lens of rimless spectacles, comprising: a holding device to hold the lens, a tool in the form of a face cutter or face grinder; and a drive unit, supporting the tool, to rotate the tool about an axis of rotation, wherein the holding device comprises two plane surfaces aligned at right angles with respect to each other, wherein a first one of the two plane surfaces is formed at a support member and constitutes a support surface, wherein a second one of the two plane surfaces is formed at a contact member and constitutes a contact surface, wherein a hold-down device is configured to press the lens when located on the support surface against the contact surface, wherein the drive unit supports the tool such that the axis of rotation thereof extends perpendicularly to the support surface, wherein the holding device and the tool are movable relative to each other in such a manner that during the relative movement the axis of rotation of the tool covers a reference plane relative to the holding device, wherein the support surface and the contact surface extend perpendicularly to the reference plane, wherein a slot is formed in the support member which interrupts the support surface and into which the tool can enter during the relative movement between the holding device and the tool, wherein at least one stop member includes a stop edge that is associated with the holding device, and wherein the stop edge extends perpendicularly to the support surface and has a presettable distance from the contact surface as well as a distance from the reference plane, the distance of the stop edge from the reference plane being variable.