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

(57) Abstract: MACHINE FOR PROCESSING OPTICAL WORK PARTS, SPECIFICALLY OF GLASS PLASTIC LENSES. A machine (10) for processing optical workpieces (L) is described, comprising a workpiece spindle (12) whereby the workpiece can be rotatably driven about an axis of rotation. from the workpiece (B), at least one processing unit (14, 16, 22) comprising a tool (19, 21, 25) with which the workpiece may be machined, and an adjusting mechanism (26) to cause relative movement between the workpiece spindle and the tool to selectively enable workpiece loading / unloading and processing. A special feature is that the adjusting mechanism has a linear drive unit (28) and an oscillating drive unit (30) which are stacked on top of one another, wherein the workpiece spindle can be rotated by means of the oscillating drive unit about an oscillating axis (A) that is perpendicular to the workpiece rotation axis, while the workpiece spindle can be moved by means of the linear drive unit along an axis (...).

<td colspan="2"> •</td><td>DESCRIPTION REPORT FOR MACHINE INVENTION PATENT FOR THE PROCESSING OF OPTICAL WORK PARTS, SPECIFICALLY OF GLASS PLASTIC LENSES. TECHNICAL FIELD</td><td></td>

<td></td><td> 5</td><td>The present invention relates to a machine for processing</td><td></td>

<td></td><td></td><td>optical workpiece arrangement according to the preamble portion of claim 1 of the patent. The invention particularly relates to the industrial manufacture of prescription lens surfaces made of plastics materials such as polycarbonate, CR39 and the so-called</td><td></td>

<td> •</td><td> 10</td><td>High index materials. TECHNICAL STATE Typically, in the manufacture of plastic eyeglass lenses, an injection-molded blank of the eyeglass lens, also known as a blank, is used which comprises</td><td></td>

<td></td><td> 15</td><td>It has a standard convex outer surface finished with, for example, a spherical or progressive conformation. The usually concave internal or prescription surfaces achieve a spherical, aspheric, toric, atoric, progressive or freeform geometry (e.g. varifocal lenses) by turning, each according to the desired optical effect.</td><td></td>

<td> •</td><td> 20</td><td>The typical conventional procedure for the inner surface process includes, after locking the blank of the eyeglass lens with its outer surface over a block part, a crimping or milling process for producing the optically active conformation, generally followed. by a grinding or polishing process to achieve the highest quality</td><td></td>

<td></td><td> 25</td><td>of the required surface. Suggestions for manufacturing optically active shaping of plastic eyeglass lenses include: (A) Pure milling machines [EP-A-0 758 571], specifically for gross processing of spectacle lenses,</td><td></td>

<td></td><td> 30</td><td>(B) Pure quick tool lathes with a lathe tool which, for fine processing of spectacle lenses, can be moved in a highly dynamic manner, or</td><td></td>

(Β.1) reciprocal linear [WO-A-02/06005, EP-A-1 719 573] or revolving (B.2) [WO-A-99/33611], so that the surfaces of the

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non-symmetrical lenses with respect to rotation can be generated in the lathe process, and also (C) grinding and lathe machines combined with (C.1) a combined grinding and lathe tool [EP-A-1 291 106] or (C.2) milling and lathe units (linear or rotary operation), where spectacle lenses are processed or (C.2.1) in series [EP-A-1 719 585] - one and the same spectacle lens is ground and subsequently machined around in the machine's workspace or (C .2.2) Parallel spectacle lenses [EP-A-1 719 582] - Different are worked at the same time in the machine's working space, 15 where one is ground and the other is machined around.

Even if the following describes a machine according to item (C.2.1) as the general state of the technique, it is not limited with respect to

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With respect to one type of machine, the machine concept proposed herein may preferably be used by various types of machines, in particular machine types 20 according to (A), (Β.1), (B.2 ), (C.1) and (C.2.1) and also¹ Their combinations are also possible, for example, (C.1) and (C.2.1), ie a machine whose specially designed grinding unit (with a controlled grinding spindle at its angle of rotation) carries a tool milling and lathe combination for the rough process of the spectacle lens, which at the same time comprises a lathe unit with one (or several) quick tool arrangement (s) ensuring finish.

Accordingly, a series of combined milling and lathe machines are known from the state of the art according to EP30 A-1 719 585 forming the preamble portion of patent claim 1, which generally includes the following subassemblies: a workpiece spindle whereby the workpiece may be rotated about a workpiece rotation axis, at least one processing unit comprising a tool with which the workpiece is retained in the workpiece. The workpiece spindle can be machined, and an adjusting mechanism generates relative movement between the workpiece spindle and the tool to enable both loading / unloading and workpiece processing.

More precisely, the known machine has a unit of

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go grinding with a grinding spindle and a lathe unit with two parallel-set quick tool arrays on one side of a workspace 10, wherein the adjusting mechanism that is provided on the opposite side of the workspace is formed by a sliding arrangement that supports the workpiece spindle, and whereby the workpiece that is held in the workpiece spindle can be moved parallel to the processing units (X-axis) and towards or away from them (Y-axis). Admittedly, this machine concept proved itself already in practice that this machine is on the market under the name VFT Ultra, produced by Satisloh AG - however, it seems to require refinements as described hereinafter.

In the manufacture of plastic spectacle lenses according to

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In the prescription, considerable parts of the workpiece are machined while applying large amounts of refrigerant, which becomes essential to sufficiently isolate or enclose the workspace and ensure unobstructed chip reduction. In addition, unpleasant vapors are formed during machining of, for example, High Index materials which must be suctioned off and filtered.

For encapsulation of the workspace a spray shield made of stainless steel blade material is provided on the machine described above, which shield is relatively large and expensive because the X-axis is relatively long. Due to the fact that the shield is shielded for the workpiece spindle. This opening is closed by having to make possible the movement of the workpiece spindle along the long X-axis, an elongated opening is provided in the casing with a combined sliding and cylindrical casing that cooperates with contacts on the casing side. In addition to the fact that the encapsulation obtained with such covers is not always satisfactory, these covers are also subject to considerable wear and friction, which in actual practice 5 may be detrimental to both movement speed and machine positioning accuracy. along the X-axis.

OBJECT OF THE INVENTION

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The invention aims to provide a compact machine version for machining optical workpieces, in particular plastic spectacle lenses, in which the particular workspace can be easily wrapped and insulated.

SUMMARY OF THE INVENTION

This object is solved by the features specified in claim 1. Advantageous and functional further developments of the invention form the subject matter of claims 2 to 14.

According to the invention, in a generic machine for processing optical workpieces, in particular plastic spectacle lenses, the adjusting mechanism comprises a linear oscillating unit and a rotary drive unit which are stacked on one side.

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another, wherein the workpiece spindle can be rotated by means of the oscillating drive unit about an oscillating axis A which is substantially perpendicular to the axis of rotation of workpiece B, while the workpiece spindle may be moved by the linear drive unit along a linear axis Y which is substantially perpendicular to the oscillating axis A and substantially parallel to the axis of rotation of workpiece B, or substantially parallel to the oscillating axis A and substantially perpendicular to the axis of rotation of workpiece B.

Even if the first alternative mentioned, wherein the axis lies parallel to the axis of rotation of the workpiece B, is - in comparison to the second alternative mentioned, wherein the linear axis Y is substantially linear Y is substantially perpendicular to the oscillating axis A and substantial5

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parallel to the oscillating axis A and substantially perpendicular to the axis of rotation of workpiece B - preferred with intention of the number of degrees of freedom of movement of the workpiece as it makes it possible to modularly design a machine with multiple workpieces. With minimal cost processing, the second alternative is entirely suitable for the construction of, for example, a quick tool lathe, where the tool has a controlled position (grinding) axis in any case, which can compensate in most processing cases

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lack of corresponding movement possibility on the workpiece side. For the construction of a grinding machine, however, the second alternative would be less appropriate because it would require an additional controlled position linear axis on the tool side, which is not required in the first alternative grinding tool.

Several advantages result from the fact that according to the invention - compared to the general state of the art - one of the linear axes on the workpiece side (X-axis) is virtually replaced by an oscillating axis (A-axis). First, the oscillating drive unit can be more easily closed or isolated compared to the

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known linear drive means that parts of the oscillating drive unit that do not protrude into the machine workspace can be separated and / or isolated more easily from the workspace, possibly through suitable rotary transmissions, sealing arrangements. with commercially available edge seals, provisions for applying compressed air, etc., They also have in common that they can be produced to standards that ensure minimal wear and friction.

technique, if only to be able to find the individual processing units, are not present. This also leads to an acceleration

Additionally, the machine according to the invention has a very compact construction due to the stacked arrangement of the linear drive unit and the oscillating drive unit; the long motion paths, which are required for the X-axis in the general state of processing, particularly a reduction in auxiliary processing times, because of machine movement parts on the travel side of the workpiece over shortened distances. compared to the general state of the art.

In addition, the stacked arrangement of the linear drive unit and the oscillating drive unit allows guideways / sliders to be arranged closely together, which leads to high rigidity of the adjusting mechanism. This is also beneficial for a high

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processing quality.

Moreover, the inventive machine concept provides a very flexible modular machine design whereby, depending on the respective processing requirements, processing units, handling units, measuring stations etc. can be chosen in the manner of an assembly. parts of the prefabricated machine and can be arranged around the adjusting mechanism. And last but not least the concept of the machine according to the invention is advantageous from an ergonomic point of view; Individual machine parts can be easily arranged to ensure optimum accessibility for

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assembly, maintenance and adjustment.

Basically, it is possible to develop the stacked arrangement of the linear drive unit and the oscillating drive unit such that the oscillating drive unit is located on the linear drive unit or supported by the latter, for example if in the case of the second alternative. discussed above, wherein the linear axis Y is substantially parallel to the oscillating axis A and substantially perpendicular to the axis of rotation of workpiece B, the linear drive unit is aligned with respect to a lathe unit such that it can generate relative feed movement between the workpiece and the lathe tool in the direction of the workpiece rotation axis (radial augmentation). ). In this case, the oscillating drive unit could in particular serve to exchange workpieces. However, a design where the linear drive unit is arranged in the oscillating drive unit is preferred. This on the one hand makes the machine concept more flexible with respect to the possible stages of machine construction; On the other hand, the adjustment mechanism requires less construction space and the linear drive unit can be isolated more easily.

In this context it is also preferred that, by means of the oscillating drive unit, the workpiece spindle can be rotated about the oscillating axis A with rotation angle control, i.e. in a controlled angular position manner. If the oscillating drive unit,

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however, it is mainly used for workpiece exchange, as described above, it may be sufficient to merely provide an oscillating possibility of the workpiece spindle against end stops without rotation angle control, rather than a CNC controlled oscillating shaft A.

In a very compact and rigid version of the machine, the oscillating drive unit may comprise an oscillating platform on which guide rails parallel to a linear drive unit Y cursor are mounted, wherein a linear motor is arranged between the rails.

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by means of which the cursor Y can be moved relative to the oscillating platform. In addition, such guide systems and linear motors are economically available at the place of trade.

In addition, it is preferred that the oscillating drive unit has a torque motor to generate oscillating motion around the oscillating axis A. This produces a gear system to generate expendable rotation, so a gear retreat is avoided. , whereby a high and reproducible precision of the oscillating movements of the workpiece spindle about the oscillating axis A is obtained, and thus also the angle adjustment.

It is mentioned from the outset that the concept of the inventive machine is so flexible that at least one processing unit can / or a grinding unit with a tool spindle, where the most modest type of machine contains only one of those units. to understand a lathe unit with a quick tool arrangement

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processing.

In particular it is preferred that the adjusting mechanism carrying the workpiece spindle is arranged in a central part of the machine body, while at least one processing unit has a loading / unloading station for loading / unloading workpieces. and at least one additional unit or station is arranged in a star conformation - for example, cross, X- or Y- or also at different angles with respect to the oscillating axis A - around the adjusting mechanism, wherein the latter, ie at least one additional unit or station is chosen from a group containing the following units. and / or stations: a lathe unit with a quick tool arrangement, a grinding unit with a tool spindle, an engraving station for marking the workpiece and a measuring station for measuring the workpiece.

If in one of the possible machine constructions two lathe units are provided as processing units, each comprising a quick tool arrangement, it is an advantage if the quick tool arrangements are arranged opposite each other relative to the turning mechanism. adjust so that the working directions F1, F2 of the quick tool arrangements and the oscillating axis A are substantially in the same plane. In this way the quick tool arrangements can be actuated such that, for example, one of the lathe quick tool arrangements machines the reciprocating rotary workpiece (F1-axis), while the other relative quick tool arrangement to the oscillating axis A swings in the opposite direction with respect to the first quick tool arrangement to prevent excessive oscillating excitation of the machine body by oscillating compensation.

Moreover, it is preferred that the working direction F1 (F2) of the at least one lathe tool arrangement is inclined with respect to a plane which is substantially perpendicular to the oscillating axis A, so that the quick tool arrangement , seen from the adjusting mechanism, tilts in the radial outward direction. The mentioned slope of the

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rapid tool arrangement, in conjunction with, if present on the machine, feed movement of the workpiece spindle in the plane containing the workpiece rotation axis B (Y axis in the first alternative according to the invention), more precisely towards the 5 workpiece spindle, first provides a very precise height adjustment of the lathe tool cutting edge that is fixed to the quick tool arrangement with respect to the workpiece B axis of rotation, without the need to adjust the height of the cutting tool edge. lathe

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relative to the quick tool arrangement, which produces mechanical adjustment systems 10 or the like for height adjustment of the dispensable lathe tool. The amount of feed movement of the workpiece spindle in the direction of its axis (Y axis in the first alternative according to the invention) and therefore the height compensation between the workpiece B axis of rotation and the work point of the lathe cutting edge 15 obtained in addition, results attached according to the function of the predetermined angle sine between the plane which is perpendicular to the oscillating axis A and the working direction F1 (F2) of the quick tool arrangement . So at the top of it the inclination of the quick tool arrangement is such that the latter, seen from the adjusting mechanism, tilts in the radial outward direction, has the advantage that the lathe tool can withdraw in a retracted position with respect to work space on the machine when electricity is disconnected from the quick tool arrangement, and remains there in the de-energized state of the quick tool arrangement, thereby reducing the risk that the machine operator will cut into the cutting edge of the lathe too sharp during adjustment operations or the like in the machine workspace.

In additional concepts of the invention, a cover dome may be mounted to an oscillating drive unit oscillating platform, which covers the workpiece spindle and the linear drive unit at the same time, which has the advantage that no separate sealing or protective measures are required.

In this case, the cover dome may have an opening through which the workpiece spindle movably extends, wherein a fan is disposed between an internal circumference of the opening and

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an outer circumference of the workpiece spindle, which isolates the inside of the machine workspace cover dome. Such a fan is economical, sufficiently insulated, not susceptible to wear and offers very little resistance to linear movements of the workpiece spindle.

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In this context it is also an advantage if the workpiece spindle has an aerostatic bearing. Exhaust air from such a bearing acts at the same time, that is, as a blocking air that prevents the cooling lubricant or the like from entering the cover dome or the workpiece spindle of the machine through possible cracks or crevices.

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In another preferred development of the machine a pivotable upper part of the machine with respect to the machine body may be provided, which limits the working space of the machine along with the machine body, wherein the upper part of the machine has a substantially annular lower cylindrical edge positively engaging a designated substantially annular recess in the machine body when the upper part of the machine is closed. In this way it is possible, on the one hand, to open the entire workspace of the machine for maintenance, repair and / or adjustment operations by swinging the top of the machine upwards, which makes the respective machine parts highly accessible, while on the other hand. the upper part of the machine when lowered isolates and closes the workspace of the surroundings precisely by engaging the machine body as described above.

And finally, the machine body is preferably formed of mineral filler mixture and an agglutination material in a resin reaction base, has among others a high mass and also a low thermal expansion coefficient, is very rigid and has good A solid block of polymer concrete also known as mineral casting. That material, which is a composite material, comprising a

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This is especially advantageous when the lathe unit with a quick tool arrangement is used because it avoids the transfer of vibration disturbance generated by the quick tool arrangement via the machine body in the adjusting mechanism and therefore in the workpiece spindle,

BRIEF DESCRIPTION OF DRAWINGS

In the following the invention will be further explained using a preferred embodiment example with reference to the partially enclosed schematic drawings wherein the same numerals represent the same or similar parts. In the drawings:

Figure 1 is a perspective view of a machine according to the invention for processing optical workpieces in particular plastic spectacle lenses from an angle in front of and above the machine without the top of the machine (which is removed to allow a better view inside the machine), the tooling equipment of which includes a grinding unit with a tool spindle and two lathe units with each quick tool arrangement;

Figure 2 is a plan view of the machine according to Figure 1 as viewed from above the machine in Figure 1;

Figure 3 is a partial sectional view of the machine according to Figure 1 along line 11-1 in Figure 2, wherein to simplify the representation compared to Figures 1 and 2 a control cabinet and a machine transport device have been left out;

Figure 4 is a partial sectional view of the machine according to Figure 1 along line IV-IV in Figure 2, where for simplicity of representation compared to Figures 1 and 2 a machine control cabinet has been omitted;

Figure 5 is a portion of a proportionally enlarged longitudinal section of the sections as in Figures 3 and 4 of a central adjusting mechanism supporting a machine workpiece spindle according to Figure 1, comprising a drive unit. oscillating and a linear drive unit arranged therein;

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Figure 6 is a part of a section of the central adjustment mechanism supporting the machine workpiece spindle according to Figure 1 along line VI-VI in Figure 5;

Figure 7 is a perspective view of the machine according to Figure 1 from an angle in front of and above the machine, with the top of the machine in a closed, lowered position in which to simplify representation compared to Figure 1 a machine transport device has been left out;

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Figure 8 is a proportionally enlarged part section of the machine according to Figure 1 along line VIII-VIII in Figure 7 in an area where the machine body and upper part of the machine are adjacent to each other;

Figure 9 is a perspective view of an angle in front of and above the machine according to Figure 1, similar to one in Figure 7, wherein the front sliding door that can be deposited on the machine body is open to allow access to the machine's workspace by an operator; and

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Figure 10 is a perspective view of an angle at the front and above of the machine according to Figure 1, with the upper part of the machine being in an open, raised position in which to simplify representation compared to the Figure 1 A conveyor device and a machine loading / unloading station have been left out.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

In Figures 1 to 4, 7, 9 and 10 a particular CNC controlled machine for processing the surface of plastic spectacle lens L is indicated with 10. Machine 10 generally has (a) a workpiece spindle 12 whereby the spectacle lens L can be rotatably rotated about a workpiece B axis of rotation, even three processing units for machining the spectacle lens L which is retained in the workpiece spindle 12, i.e. two tor30 units (b) at least one, in the example of the embodiment shown up to * 5 φ 20 at 14, 16 each comprising an arrangement quick tool 18, 20 to cause linear movement in the F1 or F2 direction of a lathe tool 19, 21 respectively designated as the tool, as well as a grinding unit with a tool spindle 24 to cause a rotary movement of a grinding tool 25 around a tool rotation axis C, and (c) an adjustment mechanism generally indicated with 26 to cause relative movement between the workpiece spindle 12 and the respective tool 19, 21, 25 so (at least) be able to selectively load / unload or process the L-lens.

It is essential, as will be further made clear hereinafter, that the adjusting mechanism 26 has a linear drive unit 28 as well as an oscillating drive unit 30 (see Figures 3 to 6) which are stacked on top of each other. whereas the workpiece spindle 12 may be pivoted by means of the oscillating drive unit 30 about an oscillating axis A which is substantially perpendicular to the axis of rotation of the workpiece B, while the workpiece spindle 12 may be moved by the linear drive unit 28 along a linear axis Y which, in the example of the embodiment shown, is substantially perpendicular to the oscillating axis A and substantially parallel to the axis of rotation of the workpiece Working B.

The machine 10 contains a solid machine body 32 made of polymer concrete, which starting from the upper side 34 is provided with a gap-shaped ring channel 36, which limits a working space 38 of the lower and side machine 10 . In the center of the gap 36 is provided a bearing bore 40 for the adjusting mechanism 26. In Figure 2, two coolant and chip removal drains 42 can be seen at the bottom of the gap 36 which are diametrically opposed with respect to the bearing bore 40. Starting from the upper side 34 several flange facings 44 are embedded in the machine body 32 in a star-shaped arrangement around the clearance 36, which serve to assemble the processing units 14, 16, 22 and additionally units or stations, which

SN will be described in the following. Moreover, Figures 1 and 2 show a transport device 46 for transporting service trays 48,

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which is mounted along the body of the solid machine 32, on whose service trays the spectacle lenses that need to be processed or have been processed may be carried. Finally, a control cabinet is also mounted on machine body 32, which contains the necessary control and supply subassemblies.

Figures 3 to 6 show details of the

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adjustment 26. First of all it can be seen that the linear drive unit 10 is arranged on top of the oscillating drive unit 30. The latter is mounted on the bearing bore 40 of the machine body 32 by means of a bearing flange 52 which is divided into two and comprises a lower part 54 and an upper part 56.

Oscillating drive unit 30 has a torque motor

58 which is - just like all the other major drives of the machine

- cooled with water (not shown additionally) and pivots workpiece 12 spindle around oscillating axis A with

CNC of the angle of rotation. According to Figures 5 and 6 the torque motor stator 60 is fixed to the lower part 54 of the bearing flange 52, while the torque motor rotor 62 is pivoted to the lower part 54 of the bearing flange 52 by FIG. means of a combined axial / radial needle bearing arrangement 64. As an alternative an aero- or hydrostatic bearing could also be used for the rotor 62.

Between the lower part 54 and the upper part 56 of the man 25 cal flange 52 there is provided an annular travel measuring system 66 which surrounds the rotor 62 of the torque motor 58, and whereby the angular position of the rotor 62 in Relation to stator 60 can be detected for controlling the angular position of the torque motor 58. As an alternative, a hollow shaft rotary encoder could also be considered.

Above the upper 56 of the bearing flange a platform 70 is provided between the oscillating platform 68 and the upper oscillation 68 is mounted to the rotor 62 of the torque motor 58, wherein gasket 15 is fixed to the bearing flange 52 which isolate the oscillating drive unit 30 against the machine workspace 38. In addition someone can

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provide the compressed air supply (not shown), which also prevents refrigerant leakage to the oscillating drive unit 5 30.

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It must be noted about the oscillating drive unit that all electrical and signal cables as well as air and refrigerant pipes are running through the hollow rotor shaft 62 to reach the subassemblies that are mounted on the oscillating platform 68 (not additionally shown).

In particular Figures 5 and 6 further show that two guide rails 72 for a slider Y 74 of the linear drive unit 28 are mounted in a parallel arrangement on the oscillating platform 68. Here the slider Y 74 is slidably guided on the guide rails. 72 by means of four trolleys 76 in total, and in particular in the vicinity of the combined axial / radial needle bearing arrangement 64 of the oscillating drive unit 30.

Between the guide rails 72 is arranged a linear motor 78 whereby the slider Y 74 can be moved and adjusted with respect to the oscillating platform 68, and in particular the CNC position controlled in both directions of the Y axis ( the designated path measurement system is not represented for simplification). While the stator 80 of the linear motor 78 is fixed to the oscillating platform 68, the slider / slider 82 of the linear motor 78 is mounted to the slider Y 74, to which the workpiece spindle 12 is fixed.

The workpiece spindle 12 is known per se and therefore needs no further description here. It should be noted, however, that the workpiece spindle 12 has an aerostatic bearing (not shown further), which exhaust air advantageously contributes to relative isolation for the workspace 38, and is equipped with an arrangement piston-cylinder bore 84 for the operation of a stapling sleeve 86 (see Figure 5) whereby the lens for

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L-glasses that are in block on a block part (not shown) can be clipped to the workpiece spindle 12. With the help of the workpiece spindle 12 electric motor 88, finally the L-glasses lens can be actuated pivotally about the axis of rotation of the workpiece 5 with the angular position being controlled by CNC (the designated path measurement system is again omitted to simplify the design).

It can be seen in particular from Figures 3 to 6 that a cover dome 90 is attached to the oscillation platform 68 of the power unit.

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oscillating drive 30, which covers both the workpiece spindle 12 10 and the linear drive unit 28, wherein the interior 92 of the cover dome 90 with respect to the working space 38 of the machine 10 is isolated by means of 94 which are disposed between the cover dome 90 and the oscillating platform 68. On the right-hand side in Figure 5 the cover dome 90 has an opening 96 through which the spindle of workpiece 15 extends movably so that the stamping sleeve 86 with the eyeglass lens L clipped to it is located in workspace 38 of machine 10. Between the inner circumference of aperture 96 and an outer circumference of the workpiece spindle 12 is arranged a fan 98 which is suitably fixed to the workpiece spindle 12 and the cover dome 90 and (also) has the function of insulating the interior 92 of the cover dome 90 from the working space 38 of the machine 10.

From the above description it is therefore apparent that the workpiece spindle 12 can be moved with CNC position control (axis A, Y axis) in a plane that is perpendicular to the oscillating axis A by means of the locking mechanism. setting 26 including linear drive unit and oscillating drive unit 30, while the spectacle lens L may be transversely moved with respect to a processing unit it may be rotated about the rotation axis of workpiece B with the rotation angle being controlled by the CNC position (axis B). Therefore, the spectacle lens L can be transferred from one processing unit to the next processing unit or the like (axis A),

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s 20 itchy or similar (A-axis, possibly combined with Y-axis, in particular for feed motions), and / or may be moved relative to a processing unit or the like towards or away from it (Y-axis). , in particular for grinding movements). This concept not only results in a very compact machine design 10, but also increased processing accuracy - when compared to a system with a cross-cursor arrangement to move the workpiece spindle, which requires relatively longer linear guides. .

In particular Figures 1 and 2 show just various units and stations which are arranged in a star shape around the adjusting mechanism 26 which is provided in a central location on the machine body 32 and carries the workpiece spindle 12. In Figures 1 to 3 the workpiece spindle 12 faces the lathe unit 14. On the body side of the machine 32 which is diametrically opposed with respect to the adjusting mechanism 26 the lathe unit 16 is located so that the working directions F1, F2 of the oppositely positioned quick tool arrangements 18, 20 and the oscillating axis A are substantially in the same plane which can be used by proper control of the quick tool arrangements 18, 20 for oscillatory compensation. The internal design and function of the quick tool arrangements 18, 20 presented herein are described in more detail in EP-A-1 779 967 by the same applicant, which is expressly referred to herein, to avoid repetition.

In Figure 3 it can be seen in particular that the flange facings 44 provided on the machine body 32 for the quick tool arrangements 18, 20 are inclined such that they, starting from the workspace 38 of the machine 10, decline in radial direction outwards. This leads to the fact that the working directions F1, F2 of the quick tool arrangements 18, 20 which are mounted on the flange facings 44 are correspondingly inclined with respect to a plane extending substantially perpendicular to the oscillating axis A. The ratio and the function of this inclination are described in EP-A-1 719 585 by the same applicant, which is

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φ 20 expressly referred to in this context to avoid repetition. Due to the fall of flange facings 44 for the quick tool arrangements 18, 20 relative to the working space 38 it is further realizable that the lathe tools 19, 21 in the de-energized state of the quick tool arrangements 18, 20 withdraw to positions that are retracted from and remain in the workspace 38.

In particular according to Figures 1 and 2, and viewed counterclockwise about the oscillating axis A loading / unloading station 100 follows after lathe unit 14 for loading / unloading spectacle lenses L into or of the machine 10. The loading / unloading station 100 has a loading mechanism 102, which is then adapted with respect to its degrees of freedom in movement and its grasping capabilities, which can obtain an L-lens out of a service tray 48 and place it into the working space 38 of the machine 10 after opening a door 104 provided on the machine body 32, for stapling the block glass lens L to the workpiece spindle 12, and vice versa.

After the loading / unloading station 100 follows, again counterclockwise, the oscillating axis A, the milling unit 22 (see in particular Figure 4, in which the workpiece spindle 12 has thus been moved by means of of the adjusting mechanism 26, that the spectacle lens L attached to the workpiece spindle 12 faces the grinding unit 22 which is supplied stationary on the machine body 32). The design and function of the milling unit 22 are described in more detail in EP-A-0 758 571 by the same applicant, which is expressly referred to in this context to avoid repetition.

Thereafter follows the second lathe unit 16. This corresponds in principle to the first lathe unit 14, but may be equipped with another lathe tool 21 according to respective processing requirements, possibly also with an engraving tool as described. in previous German patent application 10 2006 026

524.6 by the same applicant, which is expressly referred to with respect to the function of recording and marking.

To record or mark the L-glasses another

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This could be used if this were desired and / or required, for example, a laser or engraving tool, which is supported by an aerostatic bearing just like a bore pin and is driven by means of a movable coil driver. wherein the lathe could be sized considerably smaller than the quick tool arrangements 18, 20 described herein. Such a device could, for example, be mounted to the still free flange face 44 of the machine body 32 (see Figure 1, front left and Figure 2, left below).

Finally, viewed counterclockwise around the oscillating axis A, then the second vise unit 16 follows a metering station 106 for measuring the spectacle lenses L. In this case it is possible to use a conformation detector known per se, with which the lens for glasses L can be measured in situ. It may also be envisioned to use non-contact gauging devices, for example optical measurement of L-glasses. If such a measuring station 106 is present, it is possible to calibrate the machine 10 - in particular its lathe units 14, second lathe unit 16 - automatically, as described in more detail in EP-A-1.

<img file="BRPI0803511B1_D0035.tif" />

719 584 by the same applicant.

An additional shoring spindle could also be provided in the machine body 32 with a grinding tool projecting into the workspace 38 to (pre) edge the spectacle lens L (not shown), whose rotation axis would preferably be in the same plane as the axis of rotation of workpiece B as is known from the document

EP-A-1,719,573 to the same applicant.

Further details of the encapsulation of the workspace 38 of machine 10 can be obtained from Figures 7 to 10. On the front of Figure 7, 108 indicates a sliding door which is suitably guided into and can be deposited on the machine body 32 (see Figures 9 and 10) so as to allow access to workspace 38 of machine 10 by an operator.

The covers 110 that are placed and attached to the machine body 32 in particular cover the lathe unit M and measuring station 106;

φ 20 between the last and the workspace 38 a door that can be selectively opened and closed may also be suitable (not shown) to protect metering station 106. An operation panel 112 with an integrated control screen , is disposed on the left side cover 110 in Figures 7, 8 and 10.

Moreover, the machine 10 has an upper part of the machine 114 which is pivotably articulated 116 in the control cabinet area 50 in the machine body 32 and can be pivoted therein, in particular between a lower, closed position ( Figures 7 and 9) wherein the working space 38 of the machine 10 is hermetically closed, and an upper position open (Figure 10). The upper part of the machine 114 has an elliptical window 118, which allows the operator an unobstructed view into the workspace 38 of the machine 10 when the upper part of the machine 114 is in its closed position. The slanted installation of the window 118 ensures functional drainage. of refrigerant spraying against the interior of window 118 during processing. According to Figure 8, the upper part of the machine 114 finally has a lower substantially annular cylindrical edge 120, which positively engages a designated substantially annular recess 122 in the machine body 32 when the upper part of the machine 114 is closed. For an additional seal, a surrounding seal 124 may be disposed between the edge 120 of the upper part of the machine 114 and the designated recess 122 in the machine body 32 (see Figure 8).

A machine for processing optical workpieces is described, comprising a workpiece spindle whereby the workpiece can be rotatably driven about a workpiece rotation axis (B) by the least one processing unit comprising a tool with which the workpiece may be machined, and an adjusting mechanism for causing relative movement between the workpiece spindle and the tool to selectively enable workpiece loading / unloading and processing. A special feature is that the adjusting mechanism has an inline drive unit and an oscillating drive unit that are stacked on top of each other, wherein the workpiece spindle can be rotated by means of the oscillating drive unit around. of an oscillating axis (A) which is perpendicular to the axis of rotation of the 5 workpiece, while the workpiece spindle can be moved by the linear drive unit along a linear axis (Y) which, in particular, is perpendicular to the oscillating axis and parallel to the workpiece rotation axis. As a result a very large machine is supplied.

<img file="BRPI0803511B1_D0036.tif" />

<img file="BRPI0803511B1_D0037.tif" />

especially where the workspace can be easily involved.

NUMBER REFERENCES

<td></td><td> 10</td><td>machine</td>

<td></td><td> 12</td><td>workpiece spindle</td>

<td></td><td> 14</td><td>lathe unit</td>

<td> 15</td><td> 16</td><td>lathe unit</td>

<td></td><td> 18</td><td>quick tool arrangement</td>

<td></td><td> 19</td><td>lathe tool</td>

<td></td><td> 20</td><td>quick tool arrangement</td>

<td></td><td> 21</td><td>lathe tool</td>

<td> 20</td><td> 22</td><td>grinding unit</td>

<td></td><td> 24</td><td>tool spindle</td>

<td></td><td> 25</td><td>grinding tool</td>

<td></td><td> 26</td><td>adjustment mechanism</td>

<td></td><td> 28</td><td>linear drive unit</td>

<td> 25</td><td> 30</td><td>oscillating drive unit</td>

<td></td><td> 32</td><td>machine body</td>

<td></td><td> 34</td><td>upper side</td>

<td></td><td> 36</td><td>day off</td>

<td></td><td> 38</td><td>work space</td>

<td> 30</td><td> 40</td><td>bearing hole</td>

<td></td><td> 42</td><td>drain</td>

<td></td><td> 44</td><td>flange facings</td>

<img file="BRPI0803511B1_D0038.tif" />

<img file="BRPI0803511B1_D0039.tif" />

<img file="BRPI0803511B1_D0040.tif" />

<td></td><td> 46</td><td>transport device</td>

<td></td><td> 48</td><td>service trays</td>

<td></td><td> 50</td><td>control cabinet</td>

<td></td><td> 52</td><td>bearing flange</td>

<td> 5</td><td> 54</td><td>lower part</td>

<td></td><td> 56</td><td>top</td>

<td></td><td> 58</td><td>torque motor</td>

<td></td><td> 60</td><td>stator</td>

<td></td><td> 62</td><td>rotor</td>

<td> 10</td><td> 64</td><td>axial / radial needle roller bearing arrangement</td>

<td></td><td> 66</td><td>path measurement system</td>

<td></td><td> 68</td><td>oscillation platform</td>

<td></td><td> 70</td><td>gasket</td>

<td></td><td> 72</td><td>guide rails</td>

<td> 15</td><td> 74</td><td>Y cursor</td>

<td></td><td> 76</td><td>guide car</td>

<td></td><td> 78</td><td>linear motor</td>

<td></td><td> 80</td><td>stator</td>

<td></td><td> 82</td><td>cursor / slider</td>

<td> 20</td><td> 84</td><td>piston / cylinder arrangement</td>

<td></td><td> 86</td><td>clipping bushing</td>

<td></td><td> 88</td><td>electric motor</td>

<td></td><td> 90</td><td>cover dome</td>

<td></td><td> 92</td><td>inland</td>

<td> 25</td><td> 94</td><td>sealing profile</td>

<td></td><td> 96</td><td>opening</td>

<td></td><td> 98</td><td>fan</td>

<td></td><td> 100</td><td>loading / unloading station</td>

<td></td><td> 102</td><td>charge mechanism</td>

<td> 30</td><td> 104</td><td>door</td>

<td></td><td> 106</td><td>measuring station</td>

<td></td><td> 108</td><td>sliding door</td>

<img file="BRPI0803511B1_D0041.tif" />

<img file="BRPI0803511B1_D0042.tif" />

<img file="BRPI0803511B1_D0043.tif" />

<td colspan="2"> 110</td><td>roof</td>

<td></td><td> 112</td><td>operation panel</td>

<td></td><td> 114</td><td>machine top</td>

<td></td><td> 116</td><td>articulation</td>

<td> 5</td><td> 118</td><td>window</td>

<td></td><td> 120</td><td>edge</td>

<td></td><td> 122</td><td>recess</td>

<td></td><td> 124</td><td>seal</td>

<td></td><td>Α</td><td>oscillating shaft</td>

<td> 10</td><td>Β</td><td>workpiece rotation axis</td>

<td></td><td>W</td><td>tool rotation axis</td>

<td></td><td>F1</td><td>1 linear shaft, quick tool arrangement</td>

<td></td><td>F2</td><td>2. linear axis quick tool arrangement</td>

<td></td><td>L</td><td>glasses lens</td>

<td> 15</td><td>Υ</td><td>linear axis</td>

CLAIMS