Abstract: A tool drive unit for a turning device for machining workpieces has a tool holder driven in a displaceable manner along an infeed direction by a first linear motor and driven in a pendular/displaceable manner in a direction transverse to the infeed direction by a second linear motor. Both linear motors have a moving coil/piezo element. The turning device has a main infeed drive, which produces a primary infeed movement of a turning tool in an infeed direction, and has a main transverse drive which produces a primary transverse movement in a transverse direction transversely to the infeed direction. The turning device has a secondary transverse drive whose movements are oriented in the same direction as the main transverse drive, wherein the turning tool and the axis of rotation can be moved towards one another and away from one another by the superimposition of primary and secondary transverse movements.

Abstract: A blocking piece for vacuum blocking a lens blank is disclosed. The blocking piece includes a blank contacting element formed of a rigid fluid-permeable material having an upper surface for contacting the lens blank. The blocking piece further includes a support element having an upper part tightly enclosing the blank contacting element on a peripheral surface of the blank contacting element and a lower part adapted to engage with a clamping device for clamping the blocking piece. The lens blank is fixed to the upper surface of the blank contacting element by applying a vacuum within the blocking piece to provide suction through essentially the entire upper surface of the blank contacting element. The disclosure further relates to a method for blocking a lens blank and a use of an element formed of a rigid fluid-permeable material as a part of a blocking piece.

Abstract: A tool drive unit for a turning device for machining workpieces has a tool holder driven in a displaceable manner along an infeed direction by a first linear motor and driven in a pendular/displaceable manner in a direction transverse to the infeed direction by a second linear motor. Both linear motors have a moving coil/piezo element. The turning device has a main infeed drive, which produces a primary infeed movement of a turning tool in an infeed direction, and has a main transverse drive which produces a primary transverse movement in a transverse direction transversely to the infeed direction. The turning device has a secondary transverse drive whose movements are oriented in the same direction as the main transverse drive, wherein the turning tool and the axis of rotation can be moved towards one another and away from one another by the superimposition of primary and secondary transverse movements.

Abstract: A milling device having a first milling station with a first workpiece spindle capable of rotating about a first spindle axis A1 intended to receive a first lens blank and with a first milling tool with first cutters capable of rotating about a first milling axis FA1 intended for machining a received first lens blank. At least one second milling station with a second workpiece spindle capable of rotating about a second spindle axis A2 receives a second lens blank, and with a second milling tool with second cutters capable of rotating about a second milling axis FA2 machining the received second lens blank, the spindle axes A1, A2 being aligned parallel to one another, the milling axes FA1, FA2 being aligned parallel to one another, and obliquely aligned to the spindle axes A1, A2. The invention also includes a method for the operation of the milling device.

Abstract: A polishing device for polishing curved lens faces of optical lenses has a workpiece holder for receiving an optical lens and a polishing tool. The polishing tool has a support element, an elastic substructure and a curved polishing surface on the elastic substructure. The polishing tool, with the polishing surface, is driven in a rotating manner about a rotation axis, the workpiece holder being driven in a rotating manner about a first axis, in order to rotate the optical lens. A distance between the workpiece holder and the polishing tool is adjustable along a second axis. An offset between the workpiece holder and the polishing device is adjustable along a third axis, which is aligned transversely in relation to the first axis. A pitch angle between the rotation axis and the first axis is adjustable by tilting about a fourth axis. A method of operating the device is also disclosed.

Abstract: An optical lens blank includes a first and a second lens surface, which are arranged opposite each other and which are delimited at a lens circumference, wherein the first lens surface has a surface geometry that corresponds to a first partial cutout from a first melon shape. A range of blanks consisting of such lens blanks have first lens surfaces of varying degrees of curvature, wherein the different degrees of curvature are based on different melon shapes. Finally, a method for producing a spectacle lens from such an optical lens blank includes mechanically shaping at least the first or second surface, and separating a cutout from the mechanically shaped lens blank.

Abstract: A workpiece has an optical lens blank with a first lens face and a second lens face, which are arranged opposite each other and are delimited at a lens circumference, and a cover film on the first lens face, wherein a first recess in the lens blank is formed, which is open in the direction of the first lens face and which is at least partially spanned in the direction of the first lens face by the cover film. A method for the production thereof and a method for the machining thereof. The machining method is distinguished, in particular, by the cover film being gripped for the purpose of pulling it off in the area that spans the first recess.

Abstract: A turning device has two turning stations, each with a rotatable work piece spindle to hold a lens blank and each with a turning tool for the machining of a lens blank. A fabrication mechanism for the manufacturing of eyeglass lenses from lens blanks includes a milling device and the turning device, wherein the milling device has at least one milling station with a work piece holder to hold a lens blank and a milling tool for the machining of the lens blank. A loading device is configured to remove lens blanks from the milling device and load them into the turning device. A method for operating such a fabrication mechanism includes simultaneous machining of a third lens blank with the milling tool and a first and a second lens blank with the turning tools.

Abstract: A turning device has two turning stations, each with a rotatable work piece spindle to hold a lens blank, each lens blank with a turning tool for the machining of a lens blank. A method for the operation of the turning device, wherein first and the second lens blanks are simultaneously machined with the turning tools is disclosed. Control electronics attune drive signals to each other such that certain drive signals for fast tool servomotors of the turning tools accomplish at least a temporary or phase-wise opposite running of the fast tool servomotors for vibration dampening. A fabrication mechanism is provided for the manufacturing of eyeglass lenses from lens blanks with a milling device and a turning device along with a method for operating the fabrication mechanism.

Abstract: Manufacturing spectacle lenses using lens blanks blocked onto holding elements is laborious and time-consuming. Furthermore the manufacture is rendered difficult by different surface curvatures on the receiving side of the lens blanks. The purpose of the invention is to remedy such drawbacks. Accordingly this invention relates to equipment for processing lens blanks comprising a workpiece turret supported rotatably about a main axis of rotation, said turret being fitted with at least two workpiece receptacles configured each outside the main axis of rotation and being rotatable about spindle axes, each workpiece receptacle comprising a workpiece receiving surface having a surface curvature rotationally symmetrical about the spindle axis, whereby said surface curvatures of the workpiece receiving surfaces being different from each other.

Abstract: An optical lens blank includes a first and a second lens surface, which are arranged opposite each other and which are delimited at a lens circumference, wherein the first lens surface has a surface geometry that corresponds to a first partial cutout from a first melon shape. A range of blanks consisting of such lens blanks have first lens surfaces of varying degrees of curvature, wherein the different degrees of curvature are based on different melon shapes. Finally, a method for producing a spectacle lens from such an optical lens blank includes mechanically shaping at least the first or second surface, and separating a cutout from the mechanically shaped lens blank.

Abstract: A workpiece has an optical lens blank with a first lens face and a second lens face, which are arranged opposite each other and are delimited at a lens circumference, and a cover film on the first lens face, wherein a first recess in the lens blank is formed, which is open in the direction of the first lens face and which is at least partially spanned in the direction of the first lens face by the cover film. A method for the production thereof and a method for the machining thereof. The machining method is distinguished, in particular, by the cover film being gripped for the purpose of pulling it off in the area that spans the first recess.

Abstract: A polishing device for polishing curved lens faces of optical lenses has a workpiece holder for receiving an optical lens and a polishing tool. The polishing tool has a support element, an elastic substructure and a curved polishing surface on the elastic substructure. The polishing tool, with the polishing surface, is driven in a rotating manner about a rotation axis, the workpiece holder being driven in a rotating manner about a first axis, in order to rotate the optical lens. A distance between the workpiece holder and the polishing tool is adjustable along a second axis. An offset between the workpiece holder and the polishing device is adjustable along a third axis, which is aligned transversely in relation to the first axis. A pitch angle between the rotation axis and the first axis is adjustable by tilting about a fourth axis. A method of operating the device is also disclosed.

Abstract: A milling device having a first milling station with a first workpiece spindle capable of rotating about a first spindle axis A1 intended to receive a first lens blank and with a first milling tool with first cutters capable of rotating about a first milling axis FA1 intended for machining a received first lens blank. At least one second milling station with a second workpiece spindle capable of rotating about a second spindle axis A2 receives a second lens blank, and with a second milling tool with second cutters capable of rotating about a second milling axis FA2 machining the received second lens blank, the spindle axes A1, A2 being aligned parallel to one another, the milling axes FA1, FA2 being aligned parallel to one another, and obliquely aligned to the spindle axes A1, A2. The invention also includes a method for the operation of the milling device.

Abstract: A turning device has two turning stations, each with a rotatable work piece spindle to hold a lens blank, each lens blank with a turning tool for the machining of a lens blank. A method for the operation of the turning device, wherein first and the second lens blanks are simultaneously machined with the turning tools is disclosed. Control electronics attune drive signals to each other such that certain drive signals for fast tool servomotors of the turning tools accomplish at least a temporary or phase-wise opposite running of the fast tool servomotors for vibration dampening. A fabrication mechanism is provided for the manufacturing of eyeglass lenses from lens blanks with a milling device and a turning device along with a method for operating the fabrication mechanism.

Abstract: A polishing method for machining an optical surface of an optical lens uses a polishing wheel which has a wheel axis and a polishing face. The polishing wheel is moved in relation to the lens over the surface of the latter along a spiral machining path. The polishing wheel is rotated about the wheel axis, and is (simultaneously) rotated about an axis of rotation oriented perpendicularly to the wheel axis. The rotational speed of the polishing wheel about the wheel axis and/or the axis of rotation is reduced at the spiral center of the movement path. A workpiece fixture for receiving an optical lens stands opposite the polishing wheel, with the workpiece fixture and the polishing wheel being mounted movably in relation to one another along a spiral movement path. The rotational speed of the wheel axis can be coupled kinematically to the rotational speed of the axis of rotation.

Abstract: A turning device has two turning stations, each with a rotatable work piece spindle to hold a lens blank and each with a turning tool for the machining of a lens blank. A fabrication mechanism for the manufacturing of eyeglass lenses from lens blanks includes a milling device and the turning device, wherein the milling device has at least one milling station with a work piece holder to hold a lens blank and a milling tool for the machining of the lens blank. A loading device is configured to remove lens blanks from the milling device and load them into the turning device. A method for operating such a fabrication mechanism includes simultaneous machining of a third lens blank with the milling tool and a first and a second lens blank with the turning tools.

Abstract: The invention relates to a method for processing a plastic part by using a lathe system and comprises the following steps: rotating the plastic part mashing of a tools cutting edge with the plastic part, generating a gaseous and a liquid flow, whereby the chip, which is lifted of the plastic part, is first surrounded by the gas flow and subsequently by the liquid flow Moreover the invention relates to a lathe system to carry out the said method which comprises a rotatable workpiece receptacle, a tool fitted with a tool cutting edge, and a chip removal device. The chip removal device is fitted with a gas flow generator, having a gas nozzle which points towards the tool and with a liquid flow generator having a liquid channel configured below the tools cutting edge.

Abstract: A method for manufacture of spectacle glasses from prefabricated blanks made without cutting. Each prefabricated blank has a front side not to be finished and an opposite back side. The front side and the back side have at least one optical focus in common. The method includes finishing the back side by calculating a prescription surface based on a prescription of a person. The prescription describes the vision defects of a left and a right eye of the person. The machined back side and the front side together form a first prescription lens and a second prescription lens. The method further includes making first and second spectacle glasses from the first and second prescription lenses. Focal points of the first spectacle glass correct the vision defect of the left eye and focal points of the second spectacle glass correct the vision defect of the right eye of the person.

Abstract: A processing machine that has a lens retaining device for retaining a raw lens in a processing machine has a tool mount for immobilizing the lens retaining device in a processing tool, and a workpiece mount for receiving a raw lens to be processed. The workpiece mount has a curved surface and is connected to the tool mount. An air channel extends from the tool mount to the curved surface of the workpiece mount. Furthermore, the workpiece mount has an adhesion element which at least to some extent forms the curved surface, wherein the adhesion element has adhesive properties on the curved surface. When processing raw lenses with such a retaining device, the raw lens is retained on the retaining device by means of the adhesion element and by generating a vacuum so that the raw lens is retained solely by means of the adhesion element during processing.