EP3206833A1

EP3206833A1 - Device for finely machining optically effective surfaces on, in particular, eyeglass lenses

Info

Publication number: EP3206833A1
Application number: EP15766400.4A
Authority: EP
Inventors: Steffen Wallendorf; Holger Schäfer; Peter Philipps; Andreas Kaufmann
Original assignee: Satisloh AG
Current assignee: Satisloh AG
Priority date: 2014-10-15
Filing date: 2015-09-17
Publication date: 2017-08-23
Anticipated expiration: 2035-09-17
Also published as: WO2016058663A1; CN107107298B; US20170246720A1; US10583540B2; DE102014015053A1; CN107107298A; EP3206833B1

Abstract

The invention relates to a device (10) for finely machining optically effective surfaces on, in particular, eyeglass lenses as workpieces, comprising a workpiece spindle (14), which protrudes into a working space (13) and by means of which a workpiece to be polished can be rotationally driven about a workpiece axis of rotation (C), and two tool spindles (16, 16'), which are associated with the workpiece spindle and which protrude into the working space oppositely to the workpiece spindle. On each tool spindle, a polishing tool (18, 18') can be rotationally driven about a tool axis of rotation (A, A') and is retained in such a way that the polishing tool can be axially advanced (advancing axis Z, Z') along the tool axis of rotation. Furthermore, the tool spindles can be moved together in relation to the workpiece spindle along a linear axis (X) extending substantially perpendicularly to the workpiece axis of rotation and can be pivoted about different pivoting adjustment axes (B, B'), which extend substantially perpendicularly to the workpiece axis of rotation and substantially perpendicularly to the linear axis. The tool spindles are arranged one behind the other as viewed in the direction of the linear axis. As a result of the chosen arrangement, the device is very compact and can be used in a versatile manner for various polishing processes and polishing strategies.

Description

DEVICE FOR FINE PROCESSING OF OPTICALLY ACTIVE SURFACES, IN PARTICULAR GLASSES OF GLASSES

TECHNICAL AREA

The present invention relates generally to a device for fine machining optically effective surfaces. In particular, the invention relates to a device for fine machining the optically effective surfaces of spectacle lenses, as used in so-called "RX workshops", i. Production facilities for the production of individual spectacle lenses are widely used according to prescriptions.

If, by way of example, workpieces with optically effective surfaces of "spectacle lenses" are mentioned below, not only spectacle lenses made of mineral glass but also spectacle lenses made from all other common materials such as polycarbonate, CR 39, HI index, etc., that is also be understood plastic.

STATE OF THE ART

The machining of the optically active surfaces of spectacle lenses can be roughly subdivided into two processing phases, namely first the pre-processing of the optically active surface to produce the macrographic recipe and then the fine machining of the optically effective surface to eliminate pre-processing traces and the desired micro-geometry receive. While the preprocessing of the optically effective surfaces of spectacle lenses takes place, inter alia, as a function of the material of the spectacle lenses by grinding, milling and / or turning, the optically effective surfaces of spectacle lenses during fine machining are usually subjected to a fine grinding, lapping and / or polishing process what to do uses a corresponding machine. In this respect, in the language of the present application, the term "polishing", including in word compositions such as "polishing tool" or the like., Fine grinding and lapping operations include, in the example so fine grinding or lapping.

In particular, hand-fed polishing machines in RX workshops are usually designed as "twin machines", so that advantageously the two lenses of an "RX job" - a spectacle glass recipe always consists of a pair of spectacle lenses - can be simultaneously finished. Such "twin" polishing machines are known, for example, from the publications DE 10 2009 041 442 A1 and DE 10 2011 014 230 A1, which form the closest state of the art in terms of machine kinematics.

According to such as the latter document (see there in particular Figs. 1 to 5), such a polishing machine on a machine housing which defines a working space, projecting into the two workpiece spindles, on the two lenses to be polished by means of a rotary drive substantially parallel to each other Workpiece axes of rotation Cl, C2 can be driven in rotation. On the tool side, the polishing machine has a first linear drive unit, by means of which a first tool carriage is movable along a linear axis X, which is substantially perpendicular to the workpiece axes of rotation Cl, C2 ₍ a pivot drive unit, which is arranged on the first tool carriage and by means of a pivot yoke about a pivot axis B can be pivoted, which is substantially perpendicular to the workpiece axes of rotation Cl, C2 and substantially perpendicular to the linear axis X, a second linear drive unit, which is arranged on the pivot yoke and by means of a second tool carriage along a Linear adjusting axis Z is movable, which is substantially perpendicular to the pivoting adjustment axis B, as well as two tool spindles each having a tool receiving portion, wherein the tool receiving portions each one of the workpiece spindles assigned projecting into the working space. Each tool spindle has a spindle shaft, on which the respective tool receiving portion is formed and which is rotatably mounted about a tool axis of rotation AI, A2 in a spindle housing which in turn is guided axially displaceably in a guide tube in the direction of the tool axis of rotation. While the spindle housings of the two tool spindles are flanged to the second tool carriage, the guide tubes are attached to the pivoting yoke so that as a result the tool rotation axis AI or A2 of each tool spindle with the workpiece rotation axis C1 or C2 of the associated workpiece spindle forms a plane in which the respective tool rotational axis AI or A2 with respect to the workpiece axis of rotation Cl or C2 of the associated workpiece spindle axially displaceable (linear axis X, linear adjustment axis Z) and tiltable (pivoting adjustment axis B) ..

Because of the given possibilities of movement, the previously known polishing machine allows pairwise processing of spectacle lenses with a so-called "tangential polishing kinematics" in which the (Z) polishing tools axially delivered with the tool spindles have a pre-set but fixed pivoting angle (B). the tool spindles are oscillated with relatively small strokes transversely (X) over the lenses, as well as with a polishing kinematics in which the supplied (Z) polishing tools during their oscillating transverse movement (X) at the same time continuously pivot (B) to the surface curvature of the lenses to follow, with the lenses and polishing tools the same or opposite directions with the same or different speeds around their axes of rotation (AI, A2, Cl, C2) can be driven (at least in the case of polishing tools but not need). In this respect, this polishing machine can already be advantageously used manifold. However, in certain difficult to polish materials, such as polycarbonate or HI index materials, it is still desirable to work to reduce polishing times and / or to achieve certain surface qualities with different polishing grounds, which in the above-described prior art Would require change of polishing tools. The same applies if the spectacle lenses to be polished successively differ in their geometry (surface curvature, diameter). Such conditional tool change times could be significantly reduced for industrial production through the use of automated tool changer tool magazines, but this would be associated with a high device complexity.

OBJECT OF THE INVENTION It is the object of the invention to provide a device, which is as simple and compact as possible, for the fine machining of optically effective surfaces on, in particular, spectacle lenses which can be used as widely as possible and thus permits different machining strategies, without requiring longer process times.

SUMMARY OF THE INVENTION This object is solved by the features specified in patent claim 1. Advantageous or expedient developments of the invention are subject matter of the claims 2 to 21.

According to the invention, a device for fine machining optically effective surfaces on, in particular, spectacle lenses as workpieces comprises a workpiece projecting into a working space. piece spindle, over which a workpiece to be polished about a workpiece axis of rotation C is rotationally driven, and two of the workpiece spindle associated and opposite in the

Working space projecting tool spindles, on each of which a polishing tool about a tool axis of rotation A, A 'rotationally driven and along the tool rotation axis A, A ¹ axially deliverable (Z) is held and the relative to the workpiece spindle along a substantially perpendicular to the Workpiece axis of rotation C extending linear axis X are movable and pivotable about different pivoting adjusting axes B, B ', which extend substantially perpendicular to the workpiece axis of rotation C and substantially perpendicular to the linear axis X, the tool spindles seen in the direction of the linear axis X. arranged one behind the other.

Because the tool spindles are initially arranged one behind the other in the direction of the linear axis X, the device according to the invention advantageously has a compact construction, which predestines it for use as a polishing cell in a polishing machine with a plurality of devices according to the invention. It is conducive to a simple design of the device as well as in terms of energy efficiency, that both tool spindles are movable both along the linear axis X and about the various pivoting adjusting axes B, B ¹ , because for each of these linear or Pivoting movements thus only one drive is needed.

Even a polishing machine, in which only a device according to the invention is used (basic version), allows different processing methods and is thus very flexible: Here it should first be noted that due to the axis constellation (A, B, C, X, Z) all Polishing processes already described above with the device according to the invention can be carried out on a workpiece, possibly even without its own rotary drive for the tool. If different polishing tools are used on the two tool spindles of a device, for example, pre-polishing and fine polishing with different polishing pads can be carried out in a single-piece clamping, which enables very short polishing times with simultaneously increased surface quality.

It is also possible to increase the working range of the device as compared to the prior art described at the outset by using differently sized (tool diameter) and / or differently curved (tool radius of curvature) polishing tools on the two tool spindles of a device. Thus, for example, very small or very large workpieces with possibly highly curved surfaces can be machined with the device without having to make a tool change, which consequently serves to obtain short overall processing times.

When using the device in the prescription production of spectacle lenses, both concavely curved and convex curved spectacle lenses can be polished with the same polishing tool or with polishing tools shaped according to the respective spectacle lens curvature (cc or cx). Such a mixed operation in the polishing processing is particularly advantageous in the now increasingly occurring eyeglass lenses with both sides aspherical or progressive surfaces.

Furthermore, it is possible to use an identical polishing tool on both tool spindles of a device so that an automatic spindle and thus tool change can be made when a tool is worn, for example after a previously determined number of polished workpieces. Another processing variant with a device and identical polishing tools would be to use the tool spindles alternately during the machining of a workpiece or from workpiece to workpiece. This would have the advantage that the respectively unused polishing tool and the corresponding tool spindle together with drive could cool down in the break, with the effects of uniform wear, a controlled engine heat and / or increased tool life.

If at least two devices according to the invention are used as polishing cells in a polishing machine for the simultaneous polishing of at least two spectacle lenses corresponding to the number of spectacle lenses to be polished at the same time (expansion version), which can be done suitably by modular arrangement in a common machine frame, the possible processing strategies become even more diverse. First, in contrast to a polishing machine according to the above-described prior art, in which the two tool spindles are always linearly (X) or pivotally moved (B) relative to their associated two workpiece spindles, only one spectacle lens must be processed - Which may be necessary for rework - the other tool spindle not be moved without function and in an energetically unfavorable manner.

In addition, in each device or polishing cell of the polishing machine of the optimum for each lens prescription polishing process, with individually selectable Oszillationshüben, oscillation frequencies, angles of attack, speeds, polishing times and polishing pressures, are driven. Unlike in the above prior art, no compromise has to be made here, which in the case of the previously known polishing machines can ultimately lead to longer processing times than necessary and to poorer surface qualities as possible. If, for example, three devices according to the invention used as a polishing cells in a polishing machine, a spectacle lens can ^¬ few be processed by individual process parameters per spectacle lens in two polishing cells simultaneously, while in the third polishing cell - (also "special services" as the processing of special geometries - with suitable tooling eg large diameters and / or high curvatures), rework, or recipes with only one prescription glass (if the second spectacle lens is a standard glass) can be performed.

In the above-described expansion version of a polishing machine, the individual devices according to the invention can be arranged in the machine frame, for example in a star shape around a central operator position, which can have advantages for the machine feed. However, it is currently preferred if the devices are arranged side by side in such a polishing machine, so that the respective linear axes X, X ', X ¹¹ are substantially parallel to each other, which not only represents a space-saving arrangement, but also an automation in particular of the workpiece change simplified.

Thus, the polishing machine in a further developed, automated version of a transfer station with possibly one

Conveyor belt, for the storage of prescription boxes for receiving polished and polished lenses, a washing station for washing the polished lenses and - to further increase productivity - include a portal handling system by means of which the lenses automatically transported between the stations and the devices and in the respective station or device can be positioned. If no conveyor belt is used, the transfer station could also be designed such that several recipient boxes could be stored in an accessible position by the portal handling system, or in / on the transfer station would be possible to move the recipe boxes using the portal handling system. In principle, a robot handling or hexapod system would also be conceivable for workpiece handling, which could be displaceably arranged on a rail in front of the polishing cells or on a carriage above the polishing cells, but such a solution would be much more expensive.

In one advantageous refinement, the portal handling system can have a suction unit movable in space for holding a spectacle lens to be polished on the optically active surface to be polished and a multi-finger gripper movable in space for holding a polished spectacle lens at its edge. The advantage of using a multi-finger gripper is that it does not touch the polished surface, but only acts on the edge of the spectacle lens, so that the workpiece handling the risk of imprints or scratches on the polished surface is banned. The suction unit, on the other hand, can easily be used on raw parts as a reliable and robust solution.

Basically, it would be possible with the device according to the invention as such that the pivoting adjusting axes B, B 'of a device on - relative to the linear axis X - lent differing heights, which - assuming constant height of the workpiece spindle - from tool spindle to tool spindle different Axialhübe and / or tilt angle of the polishing tools permit or require. However, with regard to the possibility of using identical parts, it is also preferred if the pivoting adjusting axes B, B 'lie in an imaginary plane which extends along the linear axis X or parallel thereto. Thus, each tool spindle has the same kinematic boundary conditions; Tool strokes and thus stiffness are identical, which thus freedom of choice the positioning of the polishing tools on the front and rear tool spindle consists.

In a simple and compact design of Werkzeugoszilla- tion and tool pivoting movement possibilities with the shortest possible travel distances, the arrangement is preferably made so that the one tool spindle is mounted on a front pivot yoke pivotally articulated about a pivot axis B defined on a tool slide is, while the other tool spindle is mounted on a rear pivot yoke, which is pivotally articulated about the other pivoting adjusting axis B ¹ hinged to the same tool carriage, which in turn is guided along the linear axis X drivable with respect to a frame which surrounds the working space.

Preferably, in this case for moving and positioning of the tool slide guided on two guide rails connected to the frame, a stationary rotary drive is provided with respect to the frame, which is drivingly connected to a ball screw having a rotatably mounted ball screw, which engages with a rotatably connected to the tool slide nut. In principle, although the use of other linear guides and drives, e.g. of linear motors or the like., Conceivable, the above preferred embodiment of leadership and drive is, however, cheaper, with high rigidity and insensitivity to dirt.

In principle, it would be possible to provide a separate drive, for example a respectively assigned torque motor, for the pivoting movement of each pivoting yoke. Preferably, however, a linear drive is provided for the defined pivoting of the two tool spindles about the pivoting adjusting axes B, B ', which at one end adjoins the one pivoting yoke at a distance from the corresponding pivoting adjusting axis B and at its other end the tool carriage is articulated, wherein the one pivot yoke is also drivingly connected to the other Schwenkj och via a coupling rod, the distance from the pivot axes B, B 'with its one end to the one Schwenkj och and with its other end to the other pivot yoke is articulated. Thus, in a preferred embodiment, the device advantageously has only a simple drive for pivoting both tool spindles. With regard to the axial advancing movement of the polishing tools, it is preferred if each tool spindle has a piston-cylinder arrangement along the associated tool rotation axis A, A 'for the axial feed of the respective polishing tool, with a piston accommodated in a cylinder housing coaxial arrangement with a spindle shaft is operatively connected, which is rotatably mounted together with the piston-cylinder assembly in a spindle housing about the respective tool axis of rotation A, A ¹ . This construction is characterized in particular by a low weight, which in particular axial movements can be driven with high dynamics, which in turn allows short processing times with very high polishing quality, since the polishing tool can always follow the workpiece, even with relatively large deviations from the rotational symmetry on the workpiece.

Here, the cylinder housing of the pneumatically actuated piston-cylinder arrangement is preferably formed in two parts and lined with a barrel sleeve made of mineral glass, in which the existing on its tread of a graphite material piston is received longitudinally displaceable. An essential advantage of such a "glass cylinder" results from its very low stick-slip tendency: Thus, the device can work sensitively even with very low polishing pressures. According to an advantageous development of the piston of the piston-cylinder assembly can also be connected via a thin rod made of a spring steel tensile and pressure resistant to the spindle shaft. Such a very light and play-free power transmission element provides in a simple manner for a radial compensation possibility, which can not lead to jamming, if the center axes of the piston or the piston-cylinder assembly and the spindle shaft are not aligned correctly. Is a rotary drive desired on the polishing tool that Zy ^¬ relieving housing may be the outer peripheral side provided with a toothing for engagement of a toothed belt which is driven by a flanged to the respective Schwenkj och motor pulley to the piston-cylinder assembly and thus the spindle shaft about the respective tool rotation axis A, A 'to rotate. Such a rotary drive means of standard drive elements is not only inexpensive, but has - compared to a likewise conceivable coaxial with the spindle shaft arranged rotary drive, as shown and described in the generic prior art - the advantage of low moving masses, which in turn high quality of the polished surface in short Process times is conducive. As a further, particularly low-wear alternative for transmitting the torque from a parallel to the spindle shaft arranged rotary drive to the spindle shaft and the use of a gear transmission is conceivable. In this case, a gear made of steel can be provided on the drive side, which meshes with a spindle-side, made of plastic gear of the same size (ratio 1: 1), both gears can be seen with a helical gear ver, so that the gear pair as a result also very quiet running.

Corresponding mass advantages apply to a preferred construction, in which for torque transmission from the cylinder housing of the piston-cylinder assembly to the spindle shaft a Grooved shaft guide - so again low-cost standard elements - is provided with trained in the spindle shaft guide and thus engaging via an axial bearing element flange nut, the rotation with the cylinder housing is connected.

In the further pursuit of the inventive concept, the polishing tool may have a tool holder head which can be fastened to the respective spindle shaft in an axial and rotational manner and on which a polishing plate is exchangeably held, for which purpose a

Base body of the polishing plate and the tool holder head are provided with complementary structures for axial locking and for rotational drive of the polishing plate with the tool holder head. This causes, on the one hand, an uncomplicated interchangeability of the polishing plate and a secure hold of the polishing plate on the respective tool spindle, and on the other hand a defined, positive torque transmission between the tool holder head and polishing plate during the polishing process.

Here, the tool holder head may have a ball joint, with a ball socket received in a ball socket, which is formed on a spindle shaft of the respective tool spindle attachable ball pin, while the ball socket is formed in an on ahmeplatten-, with which the polishing plate can be locked. This allows in a simple manner a tilting of the polishing plate relative to the spindle shaft of the respective tool spindle in the polishing, so that the polishing plate can easily follow the most diverse spectacle lens geometries, even for example cylindrical surfaces or progressive surfaces with high additions. In addition, the tiltability of the polishing plate advantageously allows the carrying out of polishing processes with the "tangential polishing kinematics" already mentioned, wherein the polishing plate is able to align itself angularly with the lens glass. In a preferred embodiment, the ball head may have a receiving bore for a cross pin, which extends through the ball head and engages on both sides of the ball head with associated recesses in the ball socket to connect the receiving plate rotatably with the ball pin. Such a design of the ball joint as a universal joint allows in a simple manner to drive the polishing plate rotating, which, compared to a also conceivable, merely friction-driven rotational drive of the polishing plate with the lens allows much shorter polishing times. With regard to tiltability and rotary drive possibility Although similar could basically be realized by means of a homokinetic joint, but this would be associated with a much greater effort and higher costs.

Furthermore, it is preferable for the receiving plate to be resiliently supported on a ball pin side support flange by way of an elastic ring element in such a way that the polishing plate latched with the receiving plate endeavors to align with its central axis with the ball pin and thus with the spindle shaft of the respective tool spindle. As a result, the polishing plate is prevented from excessive tilting movements, which on the one hand especially during the reversal of motion in the mentioned oscillation of the polishing plate on the lens has a favorable effect, since the polishing plate does not buckle and can jam in the sequence on the lens. On the other hand, such an elastic support of the receiving plate of the polishing tool when mounting or placing the polishing plate of advantage, because the receiving plate assumes a defined position with slight compulsion. The merging of polishing plate and spectacle lens can also due to the elastic

(Vor) Orientation of the Aufhmeplatte done so that the polishing plate touches substantially axially oriented on the spectacle lens, and not tilted, which in particular thick or high-build polishing plates could cause problems. In principle, it would also be possible to make such a (pre) orientation of the polishing plate by means of a pneumatically actuated rubber bellows on the receiving plate, but this would be much more complex.

In a further preferred embodiment of the device of the tool holder head is in an axially retracted position of the spindle shaft with the cylinder housing or a rotatably connected part by means of a latching device latched. In the retracted position of the spindle shaft thus advantageously no energy must be expended - such. when applying a negative pressure to the above-described piston-cylinder arrangement of the tool spindle - to keep the tool holder head for example, a change of the polishing plate in the retracted position. While this would be possible other measures, such as a holding solution with permanent or electrically generated magnetic force, but these would be more complex and possibly problematic in terms of easy achievement of low breakaway moments.

In expedient, because cost-effective and lightweight design, the locking device can have a plurality of distributed over the circumference of the tool holder head, along the respective tool axis of rotation A, A 'protruding spring projections which engage positively with lugs in an annular groove which on the cylinder housing or the so that rotatably connected part is formed. Such parts can be easily made of plastic, with larger quantities possibly also injection molding technology.

Finally, it is particularly preferred if a lower region of the working space, into which the workpiece spindle protrudes, is delimited by a trough, which is integrally deep-drawn from a plastic material and has step-free wall surfaces. Advantages of a Such, possibly also hydrophobic coated tub consist in addition to their corrosion resistance in that - in comparison to an equally conceivable welded stainless steel tub - the polish runs very well, the work space is easy to clean and easy to keep tight.

BRIEF DESCRIPTION OF THE DRAWINGS

In the following the invention will be explained in more detail by means of a preferred embodiment with reference to the attached, partly simplified or schematic and not to scale drawings. In the drawings show:

Fig. 1 is a perspective view of a polishing machine for

Eyeglass lenses obliquely from above / front right with three arranged in parallel, inventive devices for fine machining the optically effective surfaces of the lenses as polishing cells, a lens washing station right next to it, a conveyor belt for recipe boxes and a portal handling system for

Transport of the lenses, to release the view of essential components or assemblies of the machine and to simplify the presentation, in particular the control unit and control, parts of the panel, door mechanisms and discs, other shelves for workpieces and tools, the utilities (including lines, hoses and pipes) for electricity, compressed air and polishing agents, the polishing agent return as well as the measuring, maintenance and safety devices have been omitted;

2 is a perspective view of the device according to the invention separated from the polishing machine according to FIG. 1 obliquely from the top / left as a separated polishing cell, wherein a tool carriage (linear axis X) for the tool spindles is in a retracted position and a downwards is closed by a tub limited working space by means of a bellows-like work space cover and a sliding door; Fig. 3 is a perspective view of the device according to

2 obliquely from the top / rear right, in which, compared to the illustration in FIG. 2, the parts delimiting the working space (tub, sliding door, bellows-type working space covers) and the workpiece and tool spindles have been omitted, in particular to illustrate a linear drive for the pivoting Control axes B, B ';

Fig. 4 is a perspective view of the device according to

Fig. 2 obliquely from above / front right, again omitting the working space limiting parts and the tool spindles and also the linear drive for the pivot axes B, B ', but with illustrated workpiece spindle (workpiece axis of rotation C), in particular for the purpose of illustrating Pivoting yokes (pivoting adjusting axes B, B ') for the tool spindles arranged one behind the other in the tool carriage (linear axis X);

Fig. 5 is a perspective view of the device according to

Fig. 2 obliquely from bottom / front right, with representation of all axes of movement or possibilities (tool axes of rotation A, A ', pivot axes B, B', workpiece axis of rotation C, linear axis X, Z delivery Z, Z ') for the polishing process;

Fig. 6 is a longitudinal sectional view of the device of Fig. 2 without omitting components shown in Fig. 2, with the tool carriage (linear axis X) in the retracted position, wherein the workpiece loading in the front region of the working space, the sliding door opened and the front bellows-like working space cover withdrawn is; 2 with the tool carriage (linear axis X) in a position advanced for a tool change, in which the tool spindles are pivoted forward (pivot adjustment axes B, B '). FIG. ) and also the tool on the rear tool spindle is extended (infeed axis Z ') _# · when the sliding door is opened again in the front region of the working space, with bellows being omitted with respect to FIG. 6 to simplify the representation of the tool spindles;

Fig. 8 is a longitudinal sectional view of the partially broken shown in the front Schwenkj och the device of FIG. 2 recorded front tool spindle with a polishing tool on the tool holder head a polishing plate is releasably held, which is in machining engagement with a surface to be machined, wherein the Polishing tool in a relation to the tool spindle extended (Z delivery axis), lower position and the associated bellows has been omitted for ease of illustration; and

FIG. 9 shows a half section of the front tool spindle with a polishing tool according to FIG. 8 in the unassembled state, again without a bellows between the polishing tool and the tool spindle, wherein the polishing tool with the polishing plate is in an upper position in which it is inserted in relation to the tool spindle (infeed axis Z) the tool receiving head of the polishing tool is latched to the tool spindle. DETAILED DESCRIPTION OF THE EMBODIMENT

In Fig. 1 is - as a preferred application or location of a device 10 for fine machining of optically active surfaces cc, cx on workpieces, such as lenses L (see Fig .. 8) - a polishing machine with 11 numbered. In the illustrated embodiment, according to the number of lenses L to be polished, three such devices 10, 10 ', 10'', each having an identical construction, are arranged in a common machine frame 12 as polishing cells. As will be explained in more detail below with reference to FIGS. 2 to 7 representative of all three devices 10, 10 ', 10''with reference to the right in Fig. 1 device 10, the device 10 has a projecting into a working space 13 factory - Piece spindle 14, via which a lens to be polished L, which is usually held by a block material M on a block piece S for inclusion in the workpiece spindle 14 (see again Fig. 8), a workpiece rotation axis C can be driven to rotate. Furthermore, the device 10 has two associated with the workpiece spindle 14 and opposite in the working space 13 projecting tool spindles 16, 16 ', on each of which a polishing tool 18, 18' about a tool axis of rotation A, A 'rotationally driven and along the tool axis of rotation A, A 'axially deliverable (Zustellachsen Z, Z') is held. The tool spindles 16, 16 'are movable relative to the workpiece spindle 14 together along a linear axis X extending substantially perpendicular to the workpiece rotation axis C and pivotable about different pivoting adjustment axes B, B' which are substantially perpendicular to the workpiece rotation axis C and extend substantially perpendicular to the linear axis X. The tool spindles 16, 16 'arranged in the direction of the linear axis X are arranged one behind the other. This essential for the device 10 construction is best seen in Fig. 5. Before the individual device 10 is described in detail, further details of its installation situation in the polishing machine 11 will first be explained with reference to FIG. 1. 1, the individual apparatuses 10, 10 ', 10' ¹ , which can be operated independently of one another, are arranged in a modular manner in the machine frame 12 and, if necessary, separately exchangeable as a respective module, arranged in a compact manner next to one another such that the respective linear axes X, X ', X' ¹ are substantially parallel to each other. This modular design allows identical assembly with the same number of advantages due to identical components, as well as allowing flexible assembly of various manual or automated variants.

Thus, in the embodiment shown in FIG. 1 to the right of the device 10, a known washing station 20 for washing the polished lenses L mounted in the machine frame 12, and right next to a transfer station 21, here provided with a conveyor belt 22, for the storage of Reciprocating boxes 23 for picking up and polishing lenses O which are to be polished are used in spectacle lens production. By means of the conveyor belt 22, the prescription boxes 23 can be moved back and forth in the polishing machine 11 in accordance with the movement arrow shown in FIG. Furthermore, the automated variant of the polishing machine 11 shown here has a portal handling system 24, by means of which the lenses L are automatically transported between the stations 20, 21 and the devices 10, 10 ', 10''and in the respective station 20, 21 or. Device 10, 10 ', 10''can be positioned. For this purpose, the portal handling system 24 has a suction unit 25 movable in space for holding a lens L to be polished on the optically effective surface cc to be polished and a multi-finger gripper 26 movable in space for holding a polished lens L at its edge. The mentioned movement possibilities in the room are in Fig. 1 by movement arrows x, y, z (horizontal or vertical linear movements) and b (tilting movement about a parallel to the horizontal direction of movement y transverse axis) indicated. More specifically, the gantry handling system 24 has two x-type x-linear motion generating units 28, 28 'disposed on the upper side of the polishing machine 11 on both sides of the machine frame 12. Their x-carriages 29, 29 'each carry a swiveling holder 30, 30' which, with the aid of a pneumatic cylinder 31, tilts a y-linear unit 32 forming the "portal" attached to the swiveling holders 30, 30 ' Generation of the y movement possible by approx. 20 °. By virtue of this measure, a z-linear unit 34 attached to a y-carriage 33 of the y-linear unit 32 can be tilted from the vertical in order to be adapted to a workpiece spindle inclination, which can not be recognized in the drawings Machine frame 12 mounted state of the devices 10, 10 ', 10''results. On the z-linear unit 34, the suction unit 25 and the Mehrfingergreifer 26 are longitudinally displaceable, in such a way that they can be moved in opposite directions by means of a common drive, ie when the suction unit 25 is driven down the multi-finger gripper 26 moves upwards at the same time and vice versa. In that regard, it will be apparent to those skilled in the art that a lens L to be polished by means of the suction unit 25 of the portal handling system 24 from a recipe box 23 on the transfer station 21 can be lifted (z) by moving the z-linear unit 34, then moved in space (b, x , y) and at the inclined workpiece spindle 14 of the desired device 10, 10 ', 10''used for polishing (z) can be. After polishing, the finished polished spectacle lens L can be lifted out of the respective device 10, 10 ', 10 "by means of the multi-finger gripper 26 (z), transported to the washing station 20 (b, x, y) and inserted therein (z), to remove scraps by washing. The clean spectacle lens L can finally lifted out of the washing station 20 by means of the multi-finger gripper 26 (z), moved to the respective recipe box 23 on the transfer station 21 (x, y) and deposited there (z). Accordingly, the spectacle lenses L can be transported back and forth between the devices 10, 10 ', 10' ¹ and stations 20, 21 as it is or in an analogous manner by means of the portal handling system 24.

For further description of the device 10, reference is now made to FIGS. 2 to 7. According to particular Fig. 4, the working space 13 of the device 10 is surrounded by a frame 36, which may be designed as a welded construction of steel parts, for example. At the top, the working space 13 can be covered by a folding bellows-type working space cover 38, which can be closed at the front by a sliding door 39. To open the working space 13 for access from the outside, the laterally suitably guided working space cover 38 can be moved or withdrawn by means of a pneumatic cylinder 40. Also for the movement of the laterally guided sliding door 39, a pneumatic cylinder 41 is provided, which is suitably articulated between the sliding door 39 and the frame 36. Downwardly, the working space 13 is delimited by a tub 42 integrally deep-drawn from a plastic material and suitably secured to the frame 36 with step-free wall surfaces and a receiving opening 43 for the workpiece spindle 14 (see FIGS. 6 and 7), through which the Workpiece spindle 14 extends suitably sealed on the circumference from below, in order to project into a lower region of the working chamber 13. FIGS. 6 and 7 likewise show a drain opening 44 for the liquid polishing agent which, in the state of the device 10 mounted in the machine frame 12 and tilted to the left as shown in FIGS Tray 42 is located. As can be seen in FIGS. 3 to 7, the frame 36 has a bottom plate 45, on which the workpiece spindle 14 is flanged from below above the receiving opening 43 in the trough 42 (see in particular FIGS. 4, 6 and 7) ). At its projecting into the working space 13 end of the workpiece spindle 14 has a collet 46 which can be actuated via an actuating mechanism not shown in order to clamp a blocked on a block piece ^' S lens L axially fixed and capable of rotation on the workpiece spindle 14. 47 is a pneumatic cylinder fastened below the base plate 45 for said actuating mechanism (see FIGS. 5 to 7), by means of which the collet 46 can be opened or closed in a manner known per se. As can also be seen in FIGS. 5 to 7, is a

Rotary drive 48 - in the illustrated embodiment, a speed-controlled asynchronous three-phase motor - flanged from below to the bottom plate 45. Likewise below the base plate 45, the rotary drive 48 is drive-connected at 49 by means of a toothed belt drive with the roller shaft of the workpiece spindle 14, so that the rotary drive 48 can rotationally drive the workpiece spindle 14 with a predetermined speed and direction of rotation (workpiece rotation axis C). Above the workpiece spindle 14, a tool slide 50 is provided for the common movement of the tool spindles 16, 16 ', which is guided along the linear axis X drivable with respect to the frame 36. More specifically, for moving and positioning the tool carriage 50 guided on two parallel guide rails 51, 52 guided on the frame 36 on opposite sides, a stationary, mounted rotary drive 53 is provided, which is drive-connected to a ball screw drive 54. The latter has a rotatably mounted at both ends, axially fixed ball screw 55, which rotatably connected to the tool slide 50 Mother 56 intervenes. Here, the tool slide 50 is guided according to FIGS. 3 to 5 on the one guide rod 51 only via a thrust bearing 57 (ball bushing), while on the other guide rod 52 via two in the direction of the guide rod 52 axially spaced thrust bearings 58 (ball bushings ), of which in Figs. 2 and 4, only the front thrust bearing 58 can be seen. The rotary drive 53 for moving the tool carriage 50 is a servomotor, which is connected to the ball screw spindle 55 via, for example, a metal bellows coupling 59. The so constructed in the

Essentially horizontal linear axis X is CNC-controlled; however, to simplify the illustration, the associated displacement measuring system is not shown. As best seen in FIGS. 2, 4 and 5, the tool carriage 50 is designed as a frame construction, with a substantially rectangular, seen in a plan view, inner opening 60 for receiving the two pivotable tool spindles 16, 16 '. Here, the one, front tool spindle 16 is mounted on or in a front Schwenkj och 61 which is pivotally about the one pivot axis B defined hinged to both sides of the opening 60 on the tool carriage 50, while the other tool spindle 16 ' is mounted on a rear pivot yoke 62, which behind the front pivot yoke 61 around the other pivoting adjusting axis B 'defined pivotable - again on both sides of the opening 60 - is hinged to the tool carriage 50. The corresponding, present on both sides of the opening 60, slide side or yoke side bearings can be seen in Figs. 4 and 5 at 63 and 64, respectively. From the schematic view in this regard in FIGS. 6 and 7 results for the height of the bearing points 63, 64, that the two pivoting adjusting axes B, B 'lie in an imaginary plane extending along the linear axis X and parallel thereto. For the drive of the swivel yokes 61, 62, ie for the defined common pivoting both tool spindles 16, 16 'about the pivot axes B, B ¹ , a further linear drive 65 is provided, with its one end to the front pivot yoke 61 at a distance to the corresponding pivoting adjusting axis B and hinged at its other end to the tool carriage 50. More precisely, in the illustrated embodiment, the linear drive 65 is a commercially available, so-called "electric cylinder", with an actuating rod 66 which can be extended or retracted via a rotary drive 67 and a gear 68 with appropriate energization of the rotary drive 67 , If the rotary drive 67 is not energized, the transmission 68 is subject to self-locking, ie the actuating rod 66 remains in its (not excessive) external forces in its respective extended position; An integrated measuring system can report the respective position. This linear drive 65 is pivotally mounted at its drive end to a mounted on the tool carriage 50 retaining fork 69, while at the other end of the linear drive. 65 the actuating rod 66 pivotally engages a fork-shaped pivot arm 70 which is fixed to the front pivot yoke 61 (see in this area the screws in Figs. 2 to 4). To transmit the pivoting movement from the front pivot yoke 61 to the rear pivot yoke 62, the two pivot yokes 61, 62 are drive connected via a coupling rod 71 spaced from the pivot axes B, B ¹ , namely above the latter with their one. End at the front pivot yoke 61 (bearing 72) and hinged at its other end to the rear pivot yoke 62 (bearing 73).

In that regard, it can be seen that in the articulated chain formed as described above, a defined axial extension or retraction of the actuating rod 66 results in that the

Schwenkjoche 61, 62 are pivoted in a defined manner about the pivot axes A, B ¹ , whereby the centrally in each Weil pivoting yoke 61 and 62 arranged tool spindles 16, 16 '- in always parallel alignment to each other - are pivoted. Further details on the tool spindles 16, 16 'are shown in FIGS. 8 and 9, which show the front tool spindle 16 (also) cut by way of example for the two identically designed tool spindles 16, 16 connected to the respective pivot yoke 61, 62.

The tool spindle 16 has a spindle housing 74, via which the tool spindle 16 according to FIG. 8 is flanged onto the pivot yoke 61 from below. The dot-dash lines shown in FIG. 8 indicate a screw connection. The other components or assemblies of the tool spindle 16 are rotatably mounted in the spindle housing 74 via a bearing assembly of rolling bearings, which comprises a lower bearing 75 and an upper floating bearing 76, which are mounted by means of a spacer sleeve 77 spaced from each other in the spindle housing 74.

For the axial infeed (infeed axes Z, Z ') of the respective polishing tool 18, 18' along the associated tool axis of rotation A, A ', each tool spindle 16, 16' has a piston-and-cylinder arrangement 78, 78 '(also in FIGS FIGS. 6 and 7 are indicated). The piston-cylinder arrangement 78 has a piston 80 accommodated in a cylinder housing 79, which is operatively connected in a coaxial arrangement to a spindle shaft 81 which can be moved out of the spindle housing 74 as shown in FIG. 8 (and FIG. 7). To extend the spindle shaft 81 from the spindle housing 74, the piston-cylinder arrangement 78 can be acted upon pneumatically via a commercially available rotary feedthrough 82 at the upper end of the cylinder housing 79 in the figures. In this case, the piston-cylinder arrangement 78, together with the spindle shaft 81 in the spindle housing 74, can be rotated around the tool rotation axis A, as already indicated. The cylinder housing 79 is further formed in two parts according to FIGS. 8 and 9, with an upper housing part 83 and a lower housing part 84, which are screwed together at 85 centered each other. In this case, a running sleeve 86 made of mineral glass is accommodated in the interior to the lining of the cylinder housing 79, which is fastened in the housing upper part 83 with the aid of a 0-ring 87 and in which the existing on its tread of a graphite material piston 80 is received longitudinally displaceable. Such, very smooth and essentially stick-slip-free "glass cylinders" are commercially available, for example, from Airpot Corporation, Norwalk, CT, USA. To avoid jamming, which can result from axial alignment errors of the (ideally) coaxially arranged components, the piston 80 of the piston-cylinder arrangement 78 is connected to the spindle shaft 81 in a tension-proof and pressure-tight manner via a thin rod 88 made of spring steel, and Although the screw connections shown in FIGS. 8 and 9 at the top and bottom of the rod 88.

The lower housing part 84 of the cylinder housing 79 is supported at the top of the figures rotatably via the floating bearing 76 in the radial direction on the spindle housing 74. In the figures below, a labyrinth part 89 is flange-mounted on the lower housing part 84 by means of a screw connection 90 which, together with the housing lower part 84, axially clamps the inner ring of the fixed bearing 75. The labyrinth part 89 forms, as the name implies, with the underside of the spindle housing 74 at 91 a sealing labyrinth with narrow gaps and also has radially within the labyrinth seal 91 a ring recess 92 for receiving a sealing ring 93, the sealing lip also with the underside of the spindle housing 74 cooperates sealingly.

As shown in FIG. 8 shows the upper housing part 83 of the cylinder housing 79 engages through an opening formed in the pivot yoke 61 94 and projects beyond them in Fig. 8 upwards. There, the housing upper part 83 of the cylinder housing 79 is provided on the outer peripheral side with a toothing 95 (cf., FIG. 9) for the engagement of a toothed belt 96. The toothed belt 96 can be driven via a swivel yoke 61 from above flanged, for each swivel yoke 61, 62 also identical motor 97 with pulley 98 to the piston-cylinder assembly 78 and thus the spindle shaft 81 in the spindle housing 74 about the tool axis of rotation A. to be controlled in speed and direction of rotation.

For torque transmission from the thus rotatably drivable cylinder housing 79 of the piston-cylinder assembly 78 to the spindle shaft 81, a groove shaft guide 99 is further provided with trained in the spindle shaft 81 guide grooves 100 and thus a thrust bearing 101 - in Figs. 8 and 9 only indicated by a thick line, because per se known-engaging flange nut 102 which is received in the labyrinth part 89 and flanged thereto by means of a screw connection 103, so that the flange nut 102 is rotatably connected to the cylinder housing 79. Such groove shaft guides are for example from the company Nippon

Bearing Co., Ltd., Ojiya City, Japan.

In that regard, it should be noted that the spindle shafts 81, 81 'of the tool spindles 16, 16' at a given time independently in rotation and rotational direction controllable about the tool axes of rotation A, A 'are rotationally driven and / or independently along the tool axes of rotation A, Α ', if necessary, also very sensitively deliverable (Zustellachsen Z, Z').

FIGS. 8 and 9 also show details of the polishing tool 18, which is currently preferred for use with this device 10. Accordingly, the polishing tool 18 has a tool receiving head 104 with a receiving plate 105, the axially and rotationally capable - yet releasably - is attached to the spindle shaft 81 of the tool spindle 16.

A polishing plate 106 is held exchangeably on the tool receiving head 104, for which purpose a base body 107 of the polishing plate 106 and the tool receiving head 104, more precisely its receiving plate 105 with complementary structures 108 for axial latching and rotational driving of the polishing plate 106 are provided with the tool holder head 104 , This interface between polishing plate 106 and tool receiving head 104, which is formed by the complementary structures 108, is the subject of EP 2 464 493 B1, to which express reference is made at this point with regard to the structure and function of the interface for avoiding repetitions.

On the side facing away from the polishing plate 106 side of the receiving plate 105 of the tool holder head 104 has a ball joint 109, with a received in a ball socket 110 ball head 111 which is fastened to a screw on the spindle shaft 81 of the tool spindle 16, more precisely at the end screwed ball pin 112. The ball socket 110, however, is formed in the receiving plate 105, with which the polishing plate 106 can be latched. The ball head 111 has in the illustrated embodiment, a receiving bore 113 for a transverse pin 114 which extends through the ball head 111 with rounded ends and engages on both sides of the ball head 111 with associated recesses 115 in the ball socket 110 to the receiving plate 105 in the Art a cardan joint capable of rotation with the ball head 111 and thus with the spindle shaft 81 of the tool spindle 16 to connect.

Between the ball pin 112 and the free end of the spindle shaft 81, an annular Abstützflansch 116 is further inserted and fixed by means of the ball pin 112 to the spindle shaft 81. On the Abstützflansch 116 is an elastic Ring element 117 of, for example, a suitable foam over which the receiving plate 105 of the tool holder head 104 can support the ball pin side Abstützflansch 116 so resilient that the latched with the receiving plate 105 polishing plate 106 endeavors, with its central axis with the ball pin 112 and thus the spindle shaft 81 of the tool spindle 16 auszufluchten.

Furthermore, it can be seen in Figures 8 and 9 that the tool receiving head 104 in an axially retracted position of the spindle shaft 81 (cf., Figure 9) with the labyrinth part 89 - as part rotatably connected to the cylinder housing 79 - by means of a latching device 118 can be locked. The latching device 118 has a plurality of distributed over the circumference of the tool receiving head 104, along the tool axis of rotation A protruding spring projections 119 which form-fitting with lugs 120 engage in an annular groove 121 which is formed on the labyrinth part 89. Thus, the polishing tool 18 can be held powerless by latching in a retracted position on the tool spindle 16. To detect the raised position of the polishing tool 18 - and thus a tool loading position of the tool spindle 16 - a ring magnet RM is glued into the piston 80 of the piston-cylinder assembly 78, which with a magnetic sensor MS (see FIGS. 2, 6 and 7 ) cooperates in the vicinity of the rotary feedthrough 82.

On the main body 107 of the polishing plate 106 shown here, a softer intermediate layer 122 of an elastic material is fastened in relation to the main body 107, on which a polishing agent carrier 123 rests, which forms the actual, outer processing surface 124 of the polishing plate 106. This embodiment of the polishing plate 106 is particularly advantageous in that the intermediate layer 122 has at least two regions of different hardness, which are arranged one behind the other in the direction of the center axis of the polishing plate 106. in the region of the intermediate layer 122 which adjoins the base body 107 is softer than the region of the intermediate layer 122 on which the polish carrier 123 rests.

More specifically, the two regions of the intermediate layer 122 are formed here by mutually different foam layers 125, 126 of constant thickness, seen along the central axis of the polishing plate 106, namely a softer foam layer 125 on the base 107, more precisely its spherical end surface 127, and a harder foam layer 126 under the polish carrier 123. The individual components (107, 125, 126, 123) of the polishing plate 106 are glued together. This polishing plate 106, which can be used universally for a large range of workpiece curvatures, in particular its specific design and dimensioning, is the subject of the parallel, ie filed with the same filing date German patent application DE 10 2014 XXX XXX.X, to which at this point in this regard to avoid repetition is expressly referenced. Of course, other polishing tools or polishing plates with the device 10 can be used in accordance with the respective polishing requirements. For example, it would be possible to use tools according to document US Pat. No. 7,559,829 B2 without their own rotary drive. In this case, in the ball head of a slightly longer ball pin receiving bore and transverse pin would be omitted as well as the Abstützflansch and the elastic ring member of the polishing tool shown here. Instead, a similar but slightly larger diameter flange would be used with an outer radial groove to receive a bellows. Since the device 10 has the two tool spindles 16, 16 'arranged one behind the other, a "mixed operation" would also be possible, with an actively rotationally driven polishing tool 18, as shown in the figures, on a tool spindle 16 and a polishing tool "only" passively rotated. Tool according to about the document US 7,559,829 B2 on the other tool spindle 16 '.

The various, with the above-described kinematics of the device 10 feasible polishing processes - where a liquid polishing agent provided on the workpiece spindle 14 polishing agent nozzles 128 (see Figs. 4 to 7, in which such an example of several on the circumference of the workpiece spindle 14 distributed nozzles is shown) is supplied to the engagement point between the tool and the workpiece - are well known to those skilled in the art and are therefore not described in detail here.

A device for fine machining of optically effective surfaces on, in particular, spectacle lenses as workpieces comprises a workpiece spindle projecting into a working space, by means of which a workpiece to be polished can be driven to rotate about a workpiece axis of rotation (C), and two of the workpiece spindle are arranged and opposite one another Working space protruding tool spindles. The tool spindles are each one

Polishing tool about a tool axis of rotation (A, A ¹ ) rotatably driven and along the tool rotation axis axially deliverable (infeed Z, Z ') held. Furthermore, the tool spindles are movable relative to the workpiece spindle together along a linear axis (X) extending essentially perpendicular to the workpiece rotation axis and pivotable about different pivoting adjustment axes (B, B ') which are substantially perpendicular to the workpiece rotation axis and substantially perpendicular to the linear axis. The tool spindles are arranged one behind the other as seen in the direction of the linear axis. As a result of the arrangement made, the device is very compact and can be used in a variety of different polishing processes and strategies. REFERENCE OVERLIST, ιο, 10 'device

polisher

machine frame

working space

Workpiece Spindle, 16 'Tool Spindles, 18' Polishing Tool

washing station

Transfer station

conveyor belt

recipe box

Portal handling system

suction unit

Multi-finger grippers, 28 'x linear units, 29' x slides

, 30 'Schwenkhaiterung

Pneumatic cylinder y-linear unit y-slide

z-linear unit, 36 ', 36' frame

, 38 ', 38' workspace cover, 39 ', 39' sliding door

'40', 40 'pneumatic cylinder, 41', 41 'pneumatic cylinder

tub

receiving opening

drain hole

baseplate

collet

Pneumatic cylinder, 48 ', 48' rotary drive toothed belt drive

tool slide

guide rod

rotary drive

Ball Screw

Ballscrew

mother

thrust

Metal Bellows

opening

front swing yoke

rear swing yoke

Slide-side bearing yoke-side bearing point, 65 ', 65' 'linear drive

actuating rod

rotary drive

transmission

holding fork

swivel arm

coupling rod

depository

spindle housing

fixed bearing

movable bearing

Distanzbuchse

, 78 'piston-cylinder arrangement

cylinder housing

piston

, 81 'spindle shaft

, 82 'rotary union

Housing top 84 housing base

85 screw connection

86 barrel sleeve

87 O-ring

88 staff

89 labyrinth part

90 screw connection

91 sealing labyrinth

92 ring recess

93 sealing ring

94 opening

95 toothing

96 toothed belt

97 engine

98 Pulley

99 groove shaft guide

100 guide groove

101 thrust bearing element

102 Flange nut

103 screw connection

104 Werkzeugaufnähmeköpf

105 receiving plate

106 polishing plates

107 basic body

108 complementary structures

109 ball joint

110 ball socket

111 ball head

112 ball pin

113 receiving bore

114 cross pin

115 recess

116 support flange

117 elastic ring element

118 RaSteinrichtung 119 spring projection

120 nose

121 ring groove

122 interlayer

123 polish carrier

124 processing area

125 softer foam layer

126 harder foam layer

127 face

128 polish nozzle

A rotary axis front polishing tool (speed-controlled)

A 'rotary axis rear polishing tool (speed-controlled) b tilting movement portal handling system

B Swivel actuator front polishing tool

B 'pivoting axis rear polishing tool

C workpiece axis of rotation (speed-controlled)

cc second optically effective area

cx first optically effective surface

L spectacle lens

M block material

MS magnetic sensor

RM ring magnet

S block piece

x linear motion portal handling system

X linear axis tool carriage (position-controlled)

y linear motion portal handling system

z Linear motion portal handling system

Z infeed axis front polishing tool (uncontrolled) Z 'infeed axis rear polishing tool (uncontrolled)

Claims

1. Device (10) for fine machining of optically active surfaces (cc, cx) on in particular spectacle lenses (L) as workpieces, with a workspace (13) projecting into a workpiece spindle (14) via which a workpiece to be polished to a workpiece Rotary axis (C) is rotationally driven, and two of the workpiece spindle (14) associated with and opposite in the working space (13) projecting tool spindles (16, 16 ') / on each of which a polishing tool (18, 18') about a tool axis of rotation ( A, A ') is rotatably driven and along the tool axis of rotation (A, A') held axially deliverable and relative to the workpiece spindle (14) along a substantially perpendicular to the workpiece axis of rotation (C) extending linear axis (X) are movable and pivotable about various pivot Stellach- sen (B, B '), which are substantially perpendicular to the workpiece axis of rotation (C) and substantially perpendicular to the linear axis (X), wherein the tool spindle n (16, 16 ') in the direction of the linear axis (X) arranged one behind the other.

A device (10) according to claim 1, wherein the pivotal adjustment axes (B, B ') lie in an imaginary plane extending along or parallel to the linear axis (X).

The apparatus (10) according to claim 1 or 2, wherein said one tool spindle (16) is mounted on a front pivot yoke (61) articulated pivotally about a pivotal adjustment axis (B) on a tool carriage (50). while the other tool spindle (16 ') on a rear pivot yoke (62') is mounted, which is pivotally articulated about the other pivoting adjusting axis (B ¹ ) hinged to the tool carriage (50), in turn along the linear axis (X) drivable is guided with respect to a frame (36) which surrounds the working space (13).

4. Device (10) according to claim 3, wherein for moving and positioning of the tool carriage (50) guided on two guide rods (51, 52) connected to the frame (36), a rotary drive (53) fixed relative to the frame (36) is provided. is provided which is drivingly connected to a ball screw (54) having a rotatably mounted ball screw (55) which engages with a rotatably connected to the tool slide (50) connected nut (56).

5. Device (10) according to claim 3 or 4, wherein for the defined pivoting of both tool spindles (16, 16 ') to the pivot axes (B, B'), a linear drive (65) is provided, with its one end to the a Schwenkj och (61) at a distance from the corresponding pivoting adjusting axis (B) and with its other end to the tool carriage (50) is articulated, and wherein the one pivot yoke (61) with the other

Pivoting yoke (62) is drivingly connected via a coupling rod (71) spaced from the pivoting adjusting axes (B, B ') with its one end to the one pivot yoke (61) and hinged with its other end to the other pivot yoke (62) is.

6. Device (10) according to any one of the preceding claims, wherein each tool spindle (16, 16 ') for the axial feed of the respective polishing tool (18, 18') along the associated tool rotation axis (A, A ') a piston-cylinder Assembly (78, 78 ') having a piston (80) received in a cylinder housing (79) operatively connected in coaxial arrangement to a spindle shaft (81, 81') cooperating with the piston-cylinder assembly (78, 78 ') in a spindle housing (74) about the respective tool rotation axis (A, A') is rotatably mounted.

7. Device (10) according to claim 6, wherein the cylinder housing (79) of the pneumatically actuated piston-cylinder Arrangement (78, 78 ') formed in two parts and lined with a barrel sleeve (86) made of mineral glass, in which the existing at its tread of a graphite material piston (80) is received longitudinally displaceable.

8. Device (10) according to claim 6 or 7, wherein the piston (80) of the piston-cylinder arrangement (78, 78 ') via a thin rod (88) made of a spring steel tensile and pressure resistant with the spin ^¬ Delwelle ( 81, 81 ') is connected.

9. Device (10) according to any one of claims 6 to 8, wherein the cylinder housing (79) is provided on the outer peripheral side with a toothing (95) for engagement of a toothed belt (96) via a on the respective pivot yoke (61, 62) flanged motor (97) with pulley (98) is drivable to rotate the piston-cylinder assembly (78, 78 ') and thus the spindle ^{shaft ■} (81, 81') about the respective tool rotation axis (A, A ').

10. Device (10) according to any one of claims 6 to 9, wherein for torque transmission from the cylinder housing (79) of the piston-cylinder arrangement (78, 78 ') on the spindle shaft (81, 81') provided a groove shaft guide (99) is, with in the spindle shaft (81, 81 ') formed guide grooves (100) and thus a via a thrust bearing member (101) engaging flange nut (102) which is non-rotatably connected to the cylinder housing (79).

11. Device (10) according to any one of claims 6 to 10, wherein the polishing tool (18, · 18 ') has an axially and rotationally engageable on the respective spindle shaft (81, 81') attachable tool holder head (104) on which a polishing plate (106) is held interchangeable, including a base body (107) of the polishing plate (106) and the tool receiving head (104) with complementary structures (108) for axial locking and to Rotational drive of the polishing plate (106) with the tool holder head (104) are provided.

12. The device (10) according to claim 11, wherein the tool holder head (104) has a ball joint (109), with a ball socket (110) received ball head (111) which at one of the spindle shaft (81, 81 ' ) of the respective tool ^¬ spindle (16, 16 ') attachable ball pin (112) is formed, while the ball socket (110) in a receiving plate (105) is formed, with which the polishing plate (106) can be latched.

13. Device (10) according to claim 12, wherein the ball head (111) has a receiving bore (113) for a transverse pin (114) which extends through the ball head (III) and extends on both sides of the ball head (III). with associated recesses (115) in the ball socket (110) engages to connect the receiving plate (105) rotatably connected to the ball pin (112).

14. Device (10) according to claim 12 or 13, wherein the receiving plate (105) via an elastic ring member (117) on a ball pin side Abstützflansch (116) so resiliently supported, that with the receiving plate (105) latched polishing plate (106). endeavors, with its central axis with the ball pin (112) and thus the spindle shaft (81, 81 ') of the respective tool spindle (16, 16') auszufluchten.

15. Device (10) according to any one of claims 11 to 14, wherein the tool receiving head (104) in an axially retracted

Position of the spindle shaft (81, 81 ') with the cylinder housing (79) or a non-rotatably connected part (89) by means of a latching device (118) can be latched.

16. Device (10) according to claim 15, wherein the latching device (118) has a plurality of over the circumference of the Werkzeugauf- receiving head (104) distributed along the respective tool axis of rotation (A, A ') projecting spring projections (119) positively engage with lugs (120) in an annular groove (121) formed on the cylinder housing (79) or the non-rotatably connected part (89).

17. Device (10) according to any one of the preceding claims, wherein a lower region of the working space (13), in which the workpiece spindle (14) protrudes, is bounded by a one-piece deep drawn from a plastic material tub (42) with stepless wall surfaces.

18. polishing machine (11) for simultaneously polishing at least two spectacle lenses (L), with a machine frame (12) in which at least two devices (10, 10 ', 10' ') corresponding to the number of the same time to polie-generating spectacle lenses (L). ) are arranged according to one of the preceding claims.

19. polishing machine (11) according to claim 18, wherein the devices (10, 10 ', 10' ') are arranged side by side, so that the respective linear axes (X, X', X '') are substantially parallel to each other.

20. polishing machine (11) according to claim 18 or 19, with a transfer station (21), which optionally has a conveyor belt (22) for the storage of recipe boxes (23) for receiving polie-saving and polished lenses (L), a washing station (20) for washing the polished lenses (L) and a Por talhandlingsystem (24), by means of which the lenses (L) automatically between the stations (20, 21) and the Vorrichtun gene (10, 10 ', 10'' ) and transportable in the respective tion (20, 21) or device (10, 10 ', 10'') are positionable.

21, polishing machine (11) according to claim 20, wherein the gantry handling system (24) movable in space suction unit (25) for holding a to be polished spectacle lens (L) on the optically active surface to be polished (cc) and a movable in space Multi-finger gripper (26) for holding a polished spectacle lens (L) at its edge.