Abstract: A device for supplying a liquid cooling lubricant to a cutting edge of a lathe tool is operatively connected with a fast-tool servo by way of a tool holder in order to be able to execute oscillating movements in an advance direction in common with the tool holder. A first connection is stationary with respect to a housing of the fast-tool servo, for a cooling lubricant source and an outlet, which is in fluid connection with the first connection, for delivery of a cooling lubricant jet to the lathe tool. The outlet is provided at the tool holder and is in fluid connection with the first connection by way of a hose portion so that the cooling lubricant jet delivered via the outlet always impinges at a predetermined point on the cutting edge of the lathe tool even when stroke movements of the tool holder take place.

Abstract: The present invention relates to a dry wipe comprising a woven or knitted microfiber fabric having hydrophilic polymer microfibers and lipophilic polymer microfibers, which is impregnated with at least one surfactant, the hydrophilic/lipophilic balance (HLB) of which is greater than or equal to 5. These wipes can be used to clean the surface of substrates and/or to confer demisting properties on hydrophilic surfaces.

Abstract: A device for deblocking optical workpieces, having a first moving device for rotating a workpiece, which is blocked on a blocking piece, about a workpiece rotational axis and a nozzle for dispensing a pressurized stream in a direction that is essentially transverse to the workpiece rotational axis onto a point of incidence in an edge region between the blocking piece and the workpiece. The device also has a second moving device for generating a relative movement between the nozzle and the workpiece. The second moving device has a nozzle guiding portion on which the nozzle is mounted and by which the nozzle can be positioned with respect to the blocking piece in a cam-controlled manner in order to aim the pressurized stream towards the point of incidence in a defined manner.

Abstract: The proposed polishing tool has a base body with an open interior space with which the polishing tool can be slidably fitted onto a holder of a tool spindle, initially as far as a latching position. A retaining ring placed in an annular groove of the interior space engages in a counter-groove of the holder. The polishing tool can then be slid further onto the holder under the polishing work pressure, until, under the simultaneous action of torque, driver elements of the base body engage in driver counter-elements of the holder for transmitting rotary movement. At least in the latter relative position between the polishing tool and tool spindle, the retaining ring provides a seal against penetration of the abrasive polishing agent.

Abstract: The invention relates to a machine for processing plastic workpieces. A machine housing surrounds a working chamber located between a workpiece spindle for rotationally driving the workpieces about a workpiece axis of rotation and a fast tool servo for producing an oscillating feeding movement of a rotary tool in the direction of the workpieces. The workpiece spindle is provided with a carriage which can be driven and is guided on at least two guide surfaces of a guiding arrangement in order to produce a relative advancing movement between the workpiece and the rotary tool. The advancing movement runs transversely with respect to the feeding movement and defining therewith a processing plane in which during processing the rotary tool engages with the workpiece. The guiding arrangement is mounted on the machine housing such that the processing plane extends between the two guide surfaces.

Abstract: The invention relates to a deblocking device and an associated method for deblocking optical workpieces, for example, eyeglass lenses. The deblocking device has a first moving apparatus for rotating a workpiece blocked on a block piece about a workpiece rotational axis, a nozzle assembly having a nozzle for discharging a high-pressure pressure medium jet in a direction substantially perpendicular to the workpiece rotational axis onto an edge area between the workpiece and block piece, and a second moving apparatus for generating a relative motion between the workpiece and the nozzle along the workpiece rotational axis.

Abstract: A block piece for holding a spectacle lens blank has a basic body with a workpiece mounting face portion against which the workpiece can be blocked with a blocking material, and a clamping portion via which the blocked workpiece can be fixed in a machine/apparatus for processing it. The basic body is made substantially of a material having a defined low water absorption and/or is sealed to at least reduce outgassing of water moisture under vacuum conditions, so that the block piece can be used also in vacuum coating processes. Alternatively or in addition, the clamping portion is constructed to be clamped by forces directed essentially perpendicular to the radial direction to cancel out each other and not deform the basic body, and/or the workpiece mounting face portion is provided with a predetermined amount of prism.

Abstract: The invention discloses a device (10) for clamping particularly an eye glass lens blocked on a block piece for processing and/or coating said eye glass lens, comprising a receiving space (34) having a center line (M) for a clamping section of the block piece, and a plurality of clamping surfaces (36) provided in a boundary region of the receiving space, which may optionally be engaged in the clamping section of the block piece in order to clamp the block piece. In order to avoid excessive deformation of the clamped block piece, the clamping surfaces are positioned opposite of each other in pairs at a radial distance to the center line and can be displaced optionally toward or away from each other by a clamping piece (38) in order to clamp the clamping section of the block piece by way of clamping forces (F), which are substantially oriented in a tangential direction at a radial distance to the center line, or in order to release the block piece.

Abstract: An apparatus for the machining of optical workpieces of materials of non-brittle hardness, particularly of plastics material spectacles lenses, has a holder, which is operatively connected with an actuator for reciprocating movement, and a support, which is fixable to the holder and to which a cutting tip of monocrystalline diamond, which has an arcuate cutting edge, is fastened. In order to be able to use the cutting edge over its curve length to avoid of premature wear in the rotary machining, provision is made for a positioning device, by which the support is fixable in at least two different relative positions with respect to the holder to dispose substantially different circumferential sections of the cutting edge for the rotary machining.

Abstract: A method for manufacturing spectacle lenses includes the steps of: providing a lets blank having a first face that possesses a final curvature and is coated with an antireflection coating as an outer layer, a second face, and an edge; blocking with a blocking material the lens blank with its first face on a block piece; processing the blocked lens blank on the second face and to obtain a processed lens; deblocking the processed lens from the block piece; and applying on top of the first face antireflection coating of the processed lens a top coating selected from at least one of hydrophobic, oleophobic or dust repelling coatings.

Abstract: The present invention relates to an optical article comprising a substrate coated with a coating preferably comprising silanol groups on its surface and, directly contacting this coating, an antifog coating precursor coating, said precursor coating preferably having a static contact angle with water of more than 10° and of less than 50° and being obtained through the grafting of at least one organosilane compound possessing a polyoxyalkylene group and at least one silicon atom bearing at least one hydrolyzable group, and is further coated with a film obtained by applying a composition containing at least one surfactant of formula F(CF2)y—(CH2—CH2O)x+1H (VIII), wherein x is an integer ranging from 1 to 14, y is an integer lower than or equal to 10, compounds of formula (VIII) in which y=6 representing at least 90% by weight by weight, relative to the weight of compounds (VIII) present in the composition, so as to form an antifog coating, having preferably a static contact angle with water lower than or equal t

Abstract: A device for finish-machining of the optically effective surfaces of, in particular, spectacle lenses has a spindle shaft, which has a tool mount section and which is mounted in a spindle housing to be rotatable about a workpiece rotational axis (A). An electric rotary drive has a rotor and a stator by which the spindle shaft operatively connected with the rotor is drivable to rotate about the tool rotational axis. An adjusting device axially displaces the tool mount section with respect to the spindle housing in the direction of the tool rotational axis (linear movement Z). The rotor and the stator are arranged coaxially with the spindle shaft, wherein at least the rotor together with the spindle shaft is axially displaceable with respect to the spindle housing in the direction of the tool rotational axis by the adjusting device.

Abstract: A device (10) for finish-machining of optically effective surfaces of workpieces, in particular spectacle lenses (L, L?), is disclosed, comprising at least one workpiece spindle (30, 30?), to which a workpiece can be clamped, at least one tool spindle (28, 28?), which is movable relative to the workpiece spindle and at which a tool (46) for machining the workpiece can be mounted, and a loading system (22) for bringing a workpiece to and taking it away from the workpiece spindle and bringing a tool to and taking it away from the tool spindle. The loading system comprises a loading head (82), which is separate from workpiece spindle and tool spindle, with at least one loading section (102, 102?) equipped with at least one mount (106, 106?) for a workpiece and at least one mount (104, 104?) for a tool, so that both the tool and the workpiece can be loaded in a time-saving single loading process.

Abstract: A device for blocking workpieces for the processing and/or coating thereof, has a support surface for positioning the workpiece to be blocked, a blocking station in which the workpiece can be blocked on a blocking piece by a temporarily deformable blocking material, and a transport device which has a retaining head for the workpiece and by which a relative movement can be created between the workpiece being retained at the retaining head, and the support surface and the blocking station. The transport device has at least four position-controlled movement axes, by which to position the workpiece in a defined manner in consideration of the orientation and geometric information relative to a blocking piece located in the blocking station, and can be retained in the defined relative position to the blocking piece during blocking while leaving a blocking material accommodation gap between the workpiece and the blocking piece.

Abstract: A device for the fine machining of optically active surfaces in particular spectacle lenses, has a spindle shaft which has a tool-holder portion and is mounted in a spindle housing such that it can rotate about a tool rotation axis. The device has an electric rotary drive with a rotor and a stator that rotates the spindle shaft operatively connected to the rotor about the tool rotation axis. The tool-holder portion can be displaced axially in the direction of the tool rotation axis. The rotor and the stator parts are axially guided in a guide tube along the tool rotation axis. The spindle shaft is in the form of a hollow shaft, via which the tool-holder portion, which is configured to hold a membrane chuck, can be subjected to a fluid.

Abstract: A device for deblocking optical workpieces, having a first moving device for rotating a workpiece, which is blocked on a blocking piece, about a workpiece rotational axis and a nozzle for dispensing a pressurized stream in a direction that is essentially transverse to the workpiece rotational axis onto a point of incidence in an edge region between the blocking piece and the workpiece. The device also has a second moving device for generating a relative movement between the nozzle and the workpiece. The second moving device has a nozzle guiding portion on which the nozzle is mounted and by which the nozzle can be positioned with respect to the blocking piece in a cam-controlled manner in order to aim the pressurized stream towards the point of incidence in a defined manner.

Abstract: A new lens blocking material (adhesive composition 78) is proposed that essentially overcomes the drawbacks of previous blocking materials. This new material combines traditional UV and/or visible light (VIS) curable polymer materials with specially selected filler (s) as a non polymerizing solid in order to achieve or improve certain desirable material properties, including those of low shrinkage, low exothermic heat of polymerization, and improving the ability to deblock, while simultaneously reducing the high cost associated with such UV/VIS radiation curable materials. The new material is being used in methods for blocking a lens blank (54) onto a lens block (62) with a lens mounting face (64) that has a predetermined block curve, in which the number of different block curves required to cover the full range of standard lenses is minimized.