Machine for machining optical work pieces, in particular plastic spectacle lenses

TECHNICAL FIELD

p0001The present invention relates to a machine for machining optical workpieces according to the preamble of claim 1. In particular, the invention relates to the industrial processing of prescription surfaces of lenses of plastics, such as polycarbonate, CR39 and so-called "high-index" materials.

STATE OF THE ART

p0002Is normally found in the machining of plastic spectacle lenses, an injection molded lens blank made of plastic, also called "Blank", above, which has a standardized endbearbeitete convex outer surface with, for example spherical or progressive form. The generally concave inner or prescription surfaces obtained by machining a spherical, aspherical, toric, atoroidal, progressive or free-form geometry (eg progressive surfaces), depending on the desired optical effect. The typical conventional sequence for inner surface machining looks after frame mounting spectacle lens blank with its outer surface on a block piece a milling or turning machining process for preparing the optically active form, usually followed by a fine grinding or polishing process to achieve the necessary surface finish.

p0003For the preparation of the optically active form of plastic spectacle lenses have been proposed:<ul><li>(A) Pure milling [<patcit id="pcit0001" dnum="EP0758571A"><text>EP-A-0758571</text></patcit>], In particular for pre-processing of the lenses,</li><li>(B) pure fast tool turning machines where for fine machining of the lenses a turning tool either</li><li>(B.1) linear reciprocal travel [<patcit id="pcit0002" dnum="WO0206005A"><text>WO-A-02/06005</text></patcit>. <patcit id="pcit0003" dnum="EP1719573A"><text>EP-A-1719573</text></patcit>] or</li><li>(B.2) in rotation [<patcit id="pcit0004" dnum="WO9933611A"><text>WO-A-99/33611</text></patcit>] Can be moved highly dynamically, so that non-rotationally symmetrical lens surfaces can be generated in the rotation process, and</li><li>(C) combined milling and turning machines</li><li>(C.1) combined milling and turning tools [<patcit id="pcit0005" dnum="EP1291106A"><text>EP-A-1291106</text></patcit>] or</li><li>(C.2) separate milling and (linear or rotary working) rotary machining units that either the lenses</li><li>(C.2.1) series [<patcit id="pcit0006" dnum="EP1719585A"><text>EP-A-1719585</text></patcit>] - One and the same lens is milled first in the working area of ​​the machine and then rotated - or</li><li>(C.2.2) parallel [<patcit id="pcit0007" dnum="EP1719582A"><text>EP-A-1719582</text></patcit>] - Different lenses are processed in the working area of ​​the machine at the same time, one is cut, while the other is rotated - edit.</li></ul>

p0004Although hereafter of a machine according to point (C.2.1) is considered, this is not restrictive in view of a machine type, rather presented here machine concept for different types of machines can be used, including the types of machines according to points (B.1 ) and (C.2.1) thereof, to any combination, for example, (C.1) and (C.2.1), ie a machine whose specially trained milling machining unit (with controlled angle of rotation spindle) a combined mill-turn tool for rough machining of the spectacle lens carries, while at the same time a rotation processing unit with one (or more) fast tool arrangement (s) is provided which is used to finishing the spectacle lens (serve).

p0005From the prior art in accordance with the <patcit id="pcit0008" dnum="EP1719585A"><text>EP-A-1719585</text></patcit> is therefore a serially operating combined milling and turning machine is known, which generally has the following modules: a workpiece spindle, by means of which the workpiece to a workpiece rotation axis is driven in rotation, at least one processing unit having a tool by means of which the at workpiece spindle held workpiece is machinable, and an adjusting mechanism for producing a relative movement between the workpiece spindle and the tool to selectively allow a loading / unloading or machining the workpiece.

p0006More specifically, the prior art machine on one side of the working space in a parallel arrangement a milling machining unit with a milling spindle and a rotation processing unit with two fast tool arrangements, with the provided on the opposite side of the working space adjusting mechanism by supporting the workpiece spindle cross table arrangement is formed, by means of which is held on the workpiece spindle workpiece on the one hand parallel to the processing units (X-axis) and on the other hand can be moved to or away from them (Y-axis) to these. Although this machine concept has been well proven in practice - this machine is under the name VFT Ultra sold by Satisloh AG, on the market - but it seems in need of improvement in the following respects.

p0007When machining plastic spectacle lenses according to prescription considerable workpiece portions are machined while supplying large coolant flows, which is why a sufficient encapsulation of the working space and an unobstructed chip evacuation are essential. Furthermore, in the machining of such "high index" materials arise unpleasant fumes that should be extracted and filtered.

p0008For the encapsulation of the work space relatively large and expensive Naßschutz is in the above-machine provided in stainless steel sheet due to the relatively long X-axis. Since the Naßschutzgehäuse must allow the movement of the workpiece spindle along the long X-axis, a slot-like opening in Naßschutzgehäuse exists for the workpiece spindle. This opening is closed by a combined slide and blind-cover which cooperates with the housing side scrapers. Apart from the fact that the seal achieved with such covers is not always satisfactory, subject to such covers also considerable wear and cause friction, which can be detrimental in the concrete application of both the travel speed and the positioning of the machine in the X axis.

p0009A machine according to the preamble of claim 1 is known from <patcit id="pcit0009" dnum="DE19751750A"><text>DE-A-197 51 750</text></patcit> known.

TASK

p0010The invention has the object of providing a compact design for machining optical workpieces, in particular plastic spectacle lenses, provide, in particular, can be the working space as simply encapsulate or seal.

SUMMARY OF THE INVENTION

p0011This object is achieved by the features specified in patent claim 1. Advantageous or expedient developments of the invention are the subject of claims 2 to. 13

p0012According to the invention comprises in a generic machine for machining optical workpieces, in particular plastic spectacle lenses, the adjustment mechanism is a linear drive unit and a pivoting drive unit, on which the linear drive unit is arranged, wherein the linear axis Y parallel substantially perpendicular to the pivot axis A and substantially the workpiece rotation axis B runs, which means the pivot drive unit the workpiece from one processing unit to another processing unit movable and wherein it is a turning unit with a fast tool arrangement at least one processing unit by means of the tool in relation to the pivot axis radially is movable.

p0013That the linear axis Y is parallel to the workpiece rotation axis B substantially perpendicular to the pivot axis A and substantially, in view of the number of degrees of freedom at the workpiece advantageous because it allows the modular design, a machine with a variety of processing units with the least effort.

p0014From the fact that according to the invention - compared to eingangsgeschilderten prior art - one of the linear axes on the workpiece side (X-axis) to a certain extent by a pivot axis (A-axis) "replaced" is, there are several advantages. Initially the swivel drive unit can be compared to the previously known linear drive unit considerably simpler "seal", ie not in the working area of ​​the machine above components of the swivel drive unit can be easily separated or isolate themselves from the working area, as by means of suitable rotary unions, sealing arrangements with commercial lip seal profiles, measures to Sperrluftbeaufschlagung etc., which is also common that they can be made very minimum wear and friction.

p0015Furthermore, the machine according to the invention builds due to the superimposed arrangement of the linear drive unit very compact on the swivel drive unit; long travel, as required in the above prior art, in the X-axis, even be able to approach to the individual processing units are not available. This also leads to an acceleration of the processing, namely a reduction of processing idle times because the moving machine components have to cover on the side of the workpiece compared to the above prior art, shorter distances.

p0016Furthermore, it allows the superimposed arrangement of the linear drive unit on the swivel drive unit, the respective guides very close or close together to place, resulting in a high stiffness of the adjusting mechanism. This is also a high processing quality conducive.

p0017Further machine concept of the invention allows a very flexible modular design of the machine may be in the respective processing requirements according to processing units, handling units, measuring stations, etc. selected in the manner of a modular system and grouped around the adjustment around. Finally machine concept of the invention is advantageous from an ergonomic point; the individual machine components can easily be arranged so that they are easily accessible for installation, maintenance and setup procedures.

p0018The fact that the linear drive unit is arranged on the swivel drive unit, makes for a machine design in terms of the possible machine configurations more flexible; on the other hand a smaller space is required for the adjustment mechanism and the linear drive unit can be easily sealed.

p0019In this context, it is also preferable that the workpiece spindle controlled by the swivel drive unit in the rotational angle, ie, angle position control is pivotable about the pivot axis A. However, if the swivel drive unit primarily the workpiece exchange is used as described above, it may be sufficient to provide only one not in the rotation angle-controlled turning capability of the workpiece spindle on end stops instead of a CNC-controlled swiveling axis A.

p0020In a very compact and rigid design of the machine, the swivel drive unit include a pivot table, mounted on the parallel guide rails for a Y slide of the linear drive unit, a linear motor is disposed between the guide rails by means of which the Y carriage is movable relative to the swivel table , Even such guide systems and linear motors are cost available on the market.

p0021It is further preferred that the pivot drive unit for producing the pivoting movement about the pivot axis A comprises a torque motor. This makes a transmission in producing the pivotal movement dispensable, so that no transmission (reverse) play may occur resulting in a high and reproducible precision of pivotal movements of the workpiece spindle about the pivot axis A and thus the angle adjustment is achieved.

p0022It has already been indicated at the outset, that machine concept of the invention is flexible, which may be in one of the processing units at a milling machining unit with a tool spindle.

p0023It is particularly preferred that the adjusting mechanism supporting the workpiece spindle is arranged at a central location in the machine frame, while the at least two processing units, a load / unload station for loading / unloading of workpieces and at least one further unit or station asteroid is - eg crosswise, X- or Y-shaped, or even relative to the pivot axis a unevenly angularly - to the adjustment mechanism are arranged around, the latter, that the one further unit or station is chosen from a group at least comprising the following units or stations: a rotary -Bearbeitungseinheit with a fast tool arrangement, a milling machining unit with a tool spindle, an engraving station for placing a mark on the workpiece and a measuring station for measuring the workpiece.

p0024in a possible expansion variant of the machine as machining units two rotary machining units are provided each having a fast tool arrangement, it is advantageous if the latter opposed positions are arranged in respect of the adjustment to each other, so that the effective directions F1, F2 of the Fast- tool arrangements and the swivel axis a lie in a plane substantially. Then namely the fast tool arrangements can be eg driven so that a fast tool arrangement rotating edited the rotating workpiece with reziprozierenden movements (F1-axis), while the other fast tool arrangement with respect to the pivot axis A in opposite directions the first fast tool arrangement swings to prevent vibration compensation by excessive vibration excitation of the machine frame.

p0025It is also preferable if the effective direction F1 (F2) of the fast tool arrangement of the at least one rotary machining unit with respect to a plane that is substantially perpendicular to the pivot axis A, is so inclined that the fast tool arrangement of the adjustment mechanism as seen from falling radially outward. First, can be represented by said skew of the fast tool arrangement in connection with the optionally present at the machine infeed of the workpiece spindle in the workpiece rotation axis B plane containing (Y-axis in the first inventive alternative), more precisely in the direction of the workpiece spindle achieve a highly accurate height adjustment of the cutting edge of the fixed to the fast tool arrangement turning tool to the workpiece rotation axis B, without requiring height displacements of the turning tool cutting edge with respect to the fast tool arrangement required, mechanical positioning systems or the like. are no longer necessary for height adjustment of the turning tool. The amount of the infeed of the workpiece spindle in the direction of its axis (Y-axis in the first inventive alternative) and therefore the thus achieved height adjustment between the workpiece rotation axis B and the operating point of the turning tool cutting edge takes place here in accordance with the sine function of the predetermined angle between the pivot axis A plane perpendicular and the direction of action F1 (F2) of the fast tool arrangement. That, moreover, the inclination of the fast tool arrangement is such that the latter seen from the adjusting mechanism of decreases radially outwards, has the advantage that the turning tool when switching off the current supply to the fast tool arrangement in a respect of the working space of the machine running back retracted position and there remains in the energized state of the fast tool arrangement, so that the risk is reduced that the operator of the machine in any setting up work or the like. in the machine's workspace injured at the very sharp turning tool cutting edge.

p0026Continuing the concept of the invention may be mounted on a swivel table of the swivel drive unit a cover, which also covers the workpiece spindle and the linear drive unit, so that no separate sealing and / or protective measures are advantageously required.

p0027Here, the cover may have an opening through which the workpiece spindle movably extends therethrough, between an inner periphery of the opening and an outer periphery of the workpiece spindle, a rolling bellows is arranged which seals the interior of the cover with respect to the working space of the machine. Such a bellows is inexpensive, reliable seal, is not susceptible to wear and sets the linear movement of the workpiece spindle only a very low resistance.

p0028In this context it is also advantageous if the workpiece spindle having an aerostatic bearing. The exhaust air of such storage serves namely simultaneously as sealing air, which prevents coolant or the like. can penetrate from the working area of ​​the machine by any existing gaps or cracks in the cover or the workpiece spindle.

p0029In a preferred embodiment of the machine may further include a relative to a machine frame pivotable machine head can be provided which defines, together with the machine frame the working area of ​​the machine, the machine head has a lower substantially annular cylindrical rim, the form-fitting assigned to a closed state of the machine head , substantially annular recess engages in the machine frame. Thus, it is on the one hand possible to expose the entire working area of ​​the machine for any maintenance, repair and / or set-up work by pivoting the machine head, the respective machine parts are easily accessible, on the other hand, the machine head in the downwardly pivoted state by said engagement with the machine frame ensures a reliable sealing of the working space from the environment.

p0030Finally, the machine frame may preferably monolithic polymer concrete - also referred to as mineral casting - be formed. This material, in which it is a composite material consisting of a mineral filler and a binder based on reactive resin has, among other things, a high mass and a low thermal expansion coefficient, is very rigid and has very good damping properties, which particularly in the case of the insert a rotation processing unit with a fast tool arrangement is beneficial to prevent electricity generated by the fast tool arrangement vibrations will interfere on the machine frame on the adjustment mechanism, and thus the workpiece spindle.

BRIEF DESCRIPTION OF THE DRAWINGS

p0031In the following the invention based on a preferred embodiment with reference to the accompanying, partly diagrammatic drawings is explained in more detail in which, like reference characters designate like or corresponding parts. In the drawings:<dl id="dl0001"><dt>Fig. 1</dt><dd>a perspective view of an inventive machine for machining optical workpieces, in particular plastic spectacle lenses, obliquely from the front / above, without the machine head (which has been removed for a better insight into the interior of the machine), the tool-standard equipment a milling machining unit with a tool spindle and two rotary machining units comprising each having a fast tool arrangement;</dd><dt>FIG. 2</dt><dd>a plan view of the machine <figref idrefs="f0001">Fig. 1</figref> viewed from above <figref idrefs="f0001">Fig. 1</figref>;</dd><dt>Fig. 3</dt><dd>a partial sectional view of the machine according to <figref idrefs="f0001">Fig. 1</figref> along the section line III-III in <figref idrefs="f0002">FIG. 2</figref>Wherein for ease of illustration with respect to the <figref idrefs="f0001">Fig. 1</figref> and <figref idrefs="f0002">2</figref> a cabinet and a transport device of the machine have been omitted;</dd><dt>Fig. 4</dt><dd>a partial sectional view of the machine according to <figref idrefs="f0001">Fig. 1</figref> along the section line IV-IV in <figref idrefs="f0002">FIG. 2</figref>Wherein for ease of illustration with respect to the <figref idrefs="f0001">Fig. 1</figref> and <figref idrefs="f0002">2</figref> a cabinet of the machine has been omitted;</dd><dt>Fig. 5</dt><dd>Compared to the partial sectional views in accordance with the <figref idrefs="f0003">FIGS. 3 and 4</figref> enlarged scale, fragmentary longitudinal sectional view of a workpiece spindle bearing central adjusting mechanism of the machine according to <figref idrefs="f0001">Fig. 1</figref>Comprising a swivel drive unit, and having thereon a linear drive unit;</dd><dt>Fig. 6</dt><dd>a fragmentary sectional view of the workpiece spindle bearing central adjustment of the machine according <figref idrefs="f0001">Fig. 1</figref> along the section line VI-VI in <figref idrefs="f0004">Fig. 5</figref>;</dd><dt>Fig. 7</dt><dd>a perspective view of the machine according to <figref idrefs="f0001">Fig. 1</figref> obliquely from the front / top, with the upper machine part, which is located in a lower, closed position, for ease of illustration over the <figref idrefs="f0001">Fig. 1</figref> a transport device of the machine has been omitted;</dd><dt>Fig. 8</dt><dd>an enlarged scale, fragmentary sectional view of the machine according to <figref idrefs="f0001">Fig. 1</figref> along the section line VIII-VIII in <figref idrefs="f0006">Fig. 7</figref> in a region in which the machine frame and the upper machine part adjacent to each other;</dd><dt>Fig. 9</dt><dd>one of the <figref idrefs="f0006">Fig. 7</figref> similar perspective view of the machine according to <figref idrefs="f0001">Fig. 1</figref> obliquely from the front / above, in which a retractable into the machine frame sliding door at the front of the machine is opened to allow an intervention into the working area of ​​the machine for an operator; and</dd><dt>Fig. 10</dt><dd>a perspective view of the machine according to <figref idrefs="f0001">Fig. 1</figref> obliquely from the front / top, with the upper machine part, which is located in an upper, open position, wherein for ease of illustration over the <figref idrefs="f0001">Fig. 1</figref> a transport device and a loading / unloading station of the machine have been omitted.</dd></dl>

DETAILED DESCRIPTION OF THE EMBODIMENT

p0032In the <figref idrefs="f0001 f0002 f0003">FIGS. 1-4</figref>. <figref idrefs="f0006">7</figref>. <figref idrefs="f0008">9</figref> and <figref idrefs="f0009">10</figref> is numbered plastic with 10 a CNC-controlled machine in particular for the surface machining of spectacle lenses L. The machine 10 generally has<ol><li>(A) a workpiece spindle 12, by means of the spectacle lens L to a workpiece rotation axis B is rotatingly drivable,</li><li>(B) at least two, in the illustrated embodiment, even three processing units for the machining of the held on the workpiece spindle 12 spectacle lens L, namely two rotary machining units 14, 16, each having a fast tool arrangement 18, 20 for generating a linear movement in the direction F1 and F2, respectively for a respective associated turning tool 19, 21 as a tool and a milling machining unit 22 having a tool spindle 24 for generating a rotational movement about a tool axis of rotation C for a milling tool 25, and</li><li>(C) to (at least) selectively to enable a generally with 26 numbered adjustment mechanism for producing a relative movement between the workpiece spindle 12 and the respective tool 19, 21, 25 charging / discharging or the spectacle lens L.</li></ol>

p0033It is essential, as will be explained in more detail, that the adjusting mechanism 26 comprises a linear drive unit 28 and a swivel drive unit 30 (see the <figref idrefs="f0003 f0004 f0005">FIGS. 3-6</figref>) Which are arranged in succession, wherein the workpiece spindle 12 by means of the pivot drive unit 30 is pivotable about a pivot axis A which is substantially perpendicular to the workpiece rotation axis B, while the workpiece spindle 12 by means of the linear drive unit 28 along a linear axis Y is movable in the substantially perpendicular parallel to the workpiece rotation axis B to the pivot axis A and substantially.

p0034The machine 10 has a monolithic molded polymer concrete machine frame 32 which is provided on the basis of its top 34 center with a ring trough-like recess 36 which defines a working space 38 of the machine 10 down and sideways. In the center of the recess 36 a bearing eye 40 is provided for adjusting 26th In<figref idrefs="f0002">FIG. 2</figref> two diametrically opposite with respect to the bearing eye 40 drains 42 for the coolant and chip removal in the bottom of the recess 36 are also visible. Around the recess 36 around a plurality of flange surfaces are in a star-like arrangement, starting from the top 34 44 recessed into the machine frame 32, which serve for the mounting of the machining units 14, 16, 22, and other units or stations, which will be described below. The<figref idrefs="f0001">Fig. 1</figref> and <figref idrefs="f0002">2</figref> show yet the side of the machine frame 32 mounted transport device 46 for transporting work boxes 48 in which to edit the / machined lenses L are transported. Finally, on the machine frame 32 is also a control panel 50 is mounted, which contains the necessary control and supply assemblies.

p0035The <figref idrefs="f0003 f0004 f0005">FIGS. 3-6</figref> are details of the adjustment to take 26th It should be appreciated that the linear drive unit 28 is arranged on the swivel drive unit 30th The latter is mounted in the bearing eye 40 of the machine frame 32 by means of a two-part bearing flange 52 which has a lower part 54 and an upper part 56th

p0036The swivel drive unit 30 has a torque motor 58, which - like all the other main drives of the machine 10 also - is water cooled (not shown in detail) and serves the workpiece spindle 12 CNC-controlled angle of rotation to be pivoted about the pivot axis A. According to the<figref idrefs="f0004">Fig. 5</figref> and <figref idrefs="f0005">6</figref> the stator 60 of the torque motor 58 mounted in the lower part 54 of the bearing flange 52, while the rotor 62 of the torque motor is rotatably supported 58 by a combined axial-radial needle bearing assembly 64 in the lower part 54 of the bearing flange 52nd Alternatively, however, could be 62 provided a aerobic or hydrostatic bearing of the rotor.

p0037Between the lower part 54 and the upper part 56 of the bearing flange 52, an annular measuring system 66 is further provided, which the rotor 62 of the torque motor surrounds 58 and by means of which the angular position of the rotor 62 relative to the stator 60 can be detected for the angular position control of the torque motor 58th Alternatively, would a hollow shaft encoder into consideration.

p0038Above the bearing flange upper part 56 a swivel table 68 is fixed the torque motor 58 on the rotor 62, between the rotary table 68 and the stationary upper part 56 of the bearing flange 52 annular seals 70 are provided, the 30 seal the swivel drive unit relative to the working space 38 of the machine. In addition, here take place Sperrluftbeaufschlagung (not shown in detail), which also prevents the coolant from entering the swivel drive unit 30th

p0039to mention to swivel drive unit 30 would finally that by the executed as a hollow shaft rotor 62 all electrical power and signal lines, and air and coolant hoses led to the mounted on the swing table 68 components through are (not shown in detail).

p0040especially the <figref idrefs="f0004">Fig. 5</figref> and <figref idrefs="f0005">6</figref> further show that two guide rails 72 are mounted on a Y-carriage 74 of the linear drive unit 28 on the swing table 68 in a parallel arrangement. Here, the Y carriage 74 is guided by means of a total of four carriages 76 slidably mounted on the guide rails 72, in close spatial proximity to the axial-radial needle bearing assembly 64 of the swivel drive unit 30th

p0041Between the guide rails 72, a linear motor 78 is arranged, by means of which the Y carriage 74 relatively moving to swivel table 68 and can be adjusted, and not CNC positionally controlled manner in both directions of the Y-axis (the associated measuring system is to simplify the representation shown). is mounted while the stator 80 of the linear motor 78 on the swivel table 68, the rotor 82 of the linear motor 78 is mounted on the Y carriage 74, on which in turn the work spindle 12 is secured.

p0042The workpiece spindle 12 is known per se and therefore need not be described at this point. should also be mentioned only that the workpiece spindle 12 having an aerostatic bearing (not shown in detail), whose exhaust contributes advantageous for sealing against the working chamber 38, and provided with a double-acting piston-cylinder assembly 84 for operating a chuck 86 (see<figref idrefs="f0004">Fig. 5</figref>), By means of which on a block piece (not shown) aufgeblockte spectacle lens L may be clamped on the workpiece spindle 12th With the help of the electric motor 88 of the workpiece spindle 12 Finally, the spectacle lens L in the angular position is CNC-controlled to the workpiece rotation axis B rotationally driven (the associated measuring system is again not shown for simplicity of illustration).

p0043In particular, in the <figref idrefs="f0003 f0004 f0005">FIGS. 3-6</figref> can also be seen that on the swivel table 68 of the pan drive unit 30, a cover 90 is mounted, which at the same time, the workpiece spindle 12 and the linear drive unit cover 28, the interior 92 of the cover 90 by means of sealing profiles 94 arranged between the cover 90 and the swing table 68 are arranged, is sealed off from the working chamber 38 of the machine 10th On the in<figref idrefs="f0004">Fig. 5</figref> right side, the cover 90 to an opening 96, through which the workpiece spindle 12 movable extending therethrough, so that the collet 86 is with the strained mind spectacle lens L in the working space 38 of the machine 10th Between an inner circumference of the opening 96 and an outer periphery of the workpiece spindle 12, a bellows 98 is finally disposed, which is suitably attached to the workpiece spindle 12 and cover 90, and (also) serving to seal the interior 92 of the cover 90 opposite the working chamber 38 of the engine 10 ,

p0044From the above description is applicable seen that the workpiece spindle 12 by means of consisting of linear drive unit 28 and swivel drive unit 30 adjusting 26 CNC position control (A-axis, Y-axis) in a respect to the pivot axis A perpendicular plane can be moved while the spectacle lens L in the rotation angle CNC position control (B-axis) is rotatable about the workpiece rotation axis B. Thus the spectacle lens L can or the like of a processing unit. or the like to the next processing unit. be moved (A-axis) with respect to a processing unit or the like. transversely to this (A-axis, possibly combined with Y-axis, in particular for feed movements) and / or with respect to a machining unit or the like. towards or away from this to (Y-axis, in particular for feed movements). This concept not only leads to a very compact structure of the machine 10, but also to a - compared to a provided for the movement of the workpiece spindle cross table assembly having relative long linear guides - increased accuracy in handling.

p0045especially the <figref idrefs="f0001">Fig. 1</figref> and <figref idrefs="f0002">2</figref> now show different units or stations arranged star-like around a central place in the machine frame 32 provided, the workpiece spindle 12 bearing adjustment mechanism 26 around. In the<figref idrefs="f0001 f0002 f0003">FIGS. 1-3</figref> contrasts with the workpiece spindle 12 of the rotary machining unit 14th In the respect of the adjustment mechanism 26 diametrically opposite side of the machine frame 32, the rotation processing unit is 16, so that the effective directions F1, F2 of the arranged in opposing positions fast tool assemblies 18, 20 and the pivot axis A is substantially in a plane lie, which can be used by suitable control of the fast tool arrangements 18, 20 for vibration compensation. The internal structure and the function of the shown here fast tool assemblies 18, 20 are in the<patcit id="pcit0010" dnum="EP1779967A"><text>EP-A-1779967</text></patcit> described in detail, which is incorporated to avoid repetition, reference is expressly made.

p0046As shown in particular in the <figref idrefs="f0003">Fig. 3</figref> is easy to recognize, extend the measures provided on the machine frame 32 flange 44 for the fast tool arrangements 18, 20 obliquely, so that they fall off, starting from the working chamber 38 of the machine 10 radially outward. This results in that the effective directions F1, F2 of the flange 44 mounted on the fast tool assemblies 18, 20 with respect to a plane which is substantially perpendicular to the pivot axis A, are correspondingly tilted. The purpose of the inclination are in the<patcit id="pcit0011" dnum="EP1719585A"><text>EP-A-1719585</text></patcit> described in detail, which is incorporated to avoid repetition reference is likewise expressly made. The dropping of the flange 44 for the fast tool arrangements 18, 20 with respect to the working chamber 38 is effected, moreover, that the turning tool 19, 21 procedure 38 retracted positions in the currentless state of the fast tool arrangements 18, 20 in respect of the working space or remain in this.

p0047Viewed in the direction of rotation counterclockwise about the pivot axis A follows according to the particular <figref idrefs="f0001">Fig. 1</figref> and <figref idrefs="f0002">2</figref> to the rotation processing unit 14, a load / unload station 100 for loading / unloading of spectacle lenses L into / out of the machine 10. The loading / unloading station 100 has a loading mechanism 102 which is adapted in terms of its degrees of freedom and gripping facilities, a spectacle lens L to be removed from an operating box 48 and inside move after opening a provided on the machine frame 32 door 104 into the working chamber 38 of the machine 10 in order to clamp the blocked spectacle lens L on the workpiece spindle 12, and vice versa.

p0048On the load / unload station 100 in turn followed in the direction of rotation seen counterclockwise about the pivot axis A, the milling machining unit 22 (see in particular the <figref idrefs="f0003">Fig. 4</figref>In which the workpiece spindle 12 is by means of the adjusting mechanism 26 process such that the tensioned on the workpiece spindle 12 spectacle lens L of the machine frame 32 fixedly provided milling machining unit 22 faces). Structure and function of milling machining unit 22 are in the<patcit id="pcit0012" dnum="EP0758571A"><text>EP-A-0758571</text></patcit> described in detail, which is incorporated to avoid repetition reference is likewise expressly made.

p0049After the second rotation processing unit follows 16. This is basically the first rotation-processing unit 14, but may be the the machining requirements provided in accordance with another turning tool 21, optionally also with an engraving tool, as in the <patcit id="pcit0013" dnum="DE102006026524A"><text>DE-A-10 2006 026 524</text></patcit> described to which the engraving or marking function is expressly made hereby with respect.

p0050To engrave or mark the spectacle lenses L could, if you ever wanted or needed, but also other means are used, such as a laser or an engraving tool, like a button is mounted aerostatic similar and driven by a voice coil actuator is, the latter could also be dimensioned significantly smaller than the fast tool arrangements illustrated here 18, 20. such a device could be mounted for example on the still free flange 44 of the machine frame 32 (see <figref idrefs="f0001">Fig. 1</figref>, Front left or <figref idrefs="f0002">FIG. 2</figref>, bottom left).

p0051seen counterclockwise about the pivot axis A after the second rotation-processing unit 16 is finally followed by a measuring station 106 for measuring the lenses L. It may be a known form of switch, by means of which the spectacle lens L can be measured in situ. Also conceivable are devices for non-contact, for example optical measurement of the lenses L. If such a measuring station 106 exists, the machine 10 - notably the rotary machining units 14, 16 - are automatically calibrated, as in the<patcit id="pcit0014" dnum="EP1719584A"><text>EP-A-1719584</text></patcit> described in detail.

p0052On the machine frame 32 could also be an additional cribbing spindle with be provided in the working space 38 preceding milling tool for (pre) Randen the lenses L (not shown) whose axis of rotation would preferably lie in the same plane as the workpiece rotation axis B such as from the <patcit id="pcit0015" dnum="EP1719573A"><text>EP-A-1719573</text></patcit> known.

p0053Further details of the encapsulation of the working space 38 of the machine 10 are the <figref idrefs="f0006 f0007 f0008 f0009">Fig. 7-10</figref> refer to. In<figref idrefs="f0006">Fig. 7</figref> front with 108 designates a slide door, which is suitably guided on the machine frame 32 and can be sunk in this (see the <figref idrefs="f0008">Fig. 9</figref> and <figref idrefs="f0009">10</figref>) To allow an operator access to the work space of the machine 38 10th On the machine frame 32 patch and attached covers 110 cover in particular the rotation processing unit 14 and the measuring station 106; between the latter and the working chamber 38 can protect the measuring station 106 also sit an optionally openable door (not shown). A control panel 112 with integrated screen is on in the<figref idrefs="f0006">Fig. 7</figref>. <figref idrefs="f0007">8th</figref> and <figref idrefs="f0009">10</figref> left cover 110 arranged.

p0054Furthermore, the machine has a 10 machine head 114, which is articulated with respect to the machine frame 32 by means of hinges 116 in the area of ​​the cabinet 50 pivotable, between a lower, closed position (<figref idrefs="f0006">Fig. 7</figref> and <figref idrefs="f0008">9</figref>), In which the working space 38 of the machine 10 is hermetically sealed, and an upper, open position (<figref idrefs="f0009">Fig. 10</figref>). The machine head 114 has an elliptical window 118 which provides the operator in the closed position of the machine head 114 free view into the working area of ​​the machine 38 10th The oblique mounting of the viewing window 118 ensures a targeted drainage of splashing during the processing from the inside against the viewing window 118 cooling lubricant. The machine head 114 finally comprises a lower substantially annular cylindrical rim 120, which in accordance with<figref idrefs="f0007">Fig. 8</figref> positively engages in the closed state of the machine head 114 into an assigned substantially annular recess 122 in the machine frame 32nd To further seal can between the edge 120 of the machine head 114 and the corresponding recess 122 in the machine frame 32 a circumferential seal be arranged 124 (see<figref idrefs="f0007">Fig. 8</figref>).

p0055It is a machine for machining optical workpieces according to claim 1 offenbart.Im result creates a very compact machine in which can be especially in the working space easily encapsulate.

LIST OF REFERENCE NUMBERS

p0056<dl id="dl0002" compact="compact"><dt>10</dt><dd>machine</dd><dt>12</dt><dd>Workpiece spindle</dd><dt>14</dt><dd>Rotary machining unit</dd><dt>16</dt><dd>Rotary machining unit</dd><dt>18</dt><dd>Fast tool arrangement</dd><dt>19</dt><dd>turning tools</dd><dt>20</dt><dd>Fast tool arrangement</dd><dt>21</dt><dd>turning tools</dd><dt>22</dt><dd>Milling machining unit</dd><dt>24</dt><dd>tool spindle</dd><dt>25</dt><dd>milling</dd><dt>26</dt><dd>adjustment</dd><dt>28</dt><dd>Linear drive unit</dd><dt>30</dt><dd>Swivel drive unit</dd><dt>32</dt><dd>machine frame</dd><dt>34</dt><dd>top</dd><dt>36</dt><dd>recess</dd><dt>38</dt><dd>working space</dd><dt>40</dt><dd>bearing eye</dd><dt>42</dt><dd>outflow</dd><dt>44</dt><dd>flange</dd><dt>46</dt><dd>transport means</dd><dt>48</dt><dd>work box</dd><dt>50</dt><dd>cabinet</dd><dt>52</dt><dd>Lagerflansch</dd><dt>54</dt><dd>lower part</dd><dt>56</dt><dd>top</dd><dt>58</dt><dd>torque motor</dd><dt>60</dt><dd>stator</dd><dt>62</dt><dd>rotor</dd><dt>64</dt><dd>Axial-radial needle bearing assembly</dd><dt>66</dt><dd>measuring system</dd><dt>68</dt><dd>pivot table</dd><dt>70</dt><dd>ring seal</dd><dt>72</dt><dd>guide rail</dd><dt>74</dt><dd>Y slide</dd><dt>76</dt><dd>carriages</dd><dt>78</dt><dd>linear motor</dd><dt>80</dt><dd>stator</dd><dt>82</dt><dd>runner</dd><dt>84</dt><dd>Piston-cylinder assembly</dd><dt>86</dt><dd>collet</dd><dt>88</dt><dd>electric motor</dd><dt>90</dt><dd>cover</dd><dt>92</dt><dd>Home Affairs</dd><dt>94</dt><dd>sealing profile</dd><dt>96</dt><dd>opening</dd><dt>98</dt><dd>bellows</dd><dt>100</dt><dd>Load / unload station</dd><dt>102</dt><dd>loading mechanism</dd><dt>104</dt><dd>door</dd><dt>106</dt><dd>measuring station</dd><dt>108</dt><dd>sliding door</dd><dt>110</dt><dd>cover</dd><dt>112</dt><dd>control panel</dd><dt>114</dt><dd>Machine head</dd><dt>116</dt><dd>hinge</dd><dt>118</dt><dd>window</dd><dt>120</dt><dd>edge</dd><dt>122</dt><dd>recess</dd><dt>124</dt><dd>poetry</dd></dl><dl id="dl0003" compact="compact"><dt>A</dt><dd>pivot axis</dd><dt>B</dt><dd>Workpiece rotation axis</dd><dt>C</dt><dd>Tool axis of rotation</dd><dt>F1</dt><dd>Linear axis 1. fast tool arrangement</dd><dt>F2</dt><dd>Linear axis 2. fast tool arrangement</dd><dt>L</dt><dd>lens</dd><dt>Y</dt><dd>linear axis</dd></dl>