EP1243380B1 - Device for grinding edges of optical lenses - Google Patents

Abstract

The device grips the lens (L) between two turnable holding shafts (10,12). It has a Z slide (14) which is pushed along onto a stand (16) in a Z direction parallel to the workpiece axis and an X slide which is pushed onto the Z slide (18) in a X direction vertical to the Z direction so that the edge treatment tool (22)is brought into reach with the lens. For industrial use, an extra manipulation device is put on the X slide with an additional edge treatment tool which moves it from a resting into an operational position.

Description

The present invention relates to a device for edge processing of an optical lens according to the preamble of claim 1. In particular, the invention relates to a suitable for industrial use, CNC-controlled Device for edge processing of spectacle lenses, the It allows glasses to be used in larger quantities the required accuracy in very short processing times finished at the edge.

Whenever "eyeglass lenses" are mentioned below optical lenses or lens blanks for glasses from the common materials, such as polycarbonate, mineral glass, CR 39, HI index, etc. and with any shape of the peripheral edge the lens or the lens blank to understand before the Processing of its edge already at one or both optically effective surface (s) may be processed but not need.

In the field of spectacle lens edging whose goal is is to finish the edge of a spectacle lens so that the spectacle lens can be inserted into a spectacle frame, Recently, a trend is emerging, this demanding Processing especially for reasons of rationalization of the Opticians workshops away to the eyeglass manufacturers too relocate. For spectacle lens manufacturers, this requires spectacle lens edging machines, also called "Edger", the without a large set-up of the most varied lenses with can process the required accuracy quickly at the edge and reliable for long periods of time are.

In the prior art, there is no lack of proposals, such as Edge processing of spectacle lenses can be accelerated. Thus, the generic EP-A-0 917 929 discloses an edging machine for spectacle lenses that increase efficiency when machining has two tool spindles, the parallel to the vertical axis of rotation at the edge processing spectacle lens arranged and each with a Grinding wheel package are equipped. The one grinding wheel package includes a coarse grinding wheel and one with different Grooves for faceting provided intermediate grinding wheel, while the other grinding wheel package is just that Coarse grinding wheel and a provided with facetted grooves Fine grinding wheel for finishing has. For every tool spindle an (X-Z) cross slide assembly is provided, with a vertical slide and a horizontal slide. Of the Vertical slide is on one side on a machine frame slidably guided in the vertical direction while on the other side of the vertical slide of the horizontal slide slidably guided in the horizontal direction. On the away from the vertical slide carries the horizontal slide the respective tool spindle. By CNC controlled Slide drives are every tool package in terms of to be processed spectacle lens radial direction and parallel movable to the axis of rotation of the spectacle lens. The work to be done Spectacle lens is between two coaxial spectacle lens holding shafts clamped, of which the lower spectacle lens holding shaft is stationary while the upper lens support shaft only in the direction of the workpiece axis relative to the lower lens holding shaft can be moved. For every Eyeglass lens holding shaft is finally a CNC-controlled Rotary drive provided so that the known edge processing machine controlled in a total of 6 CNC axes. The Rotary drives are here for a simultaneous rotation of the zu machining glasses CNC-technically coupled.

Also was used to speed up the edge processing of eyeglass lenses proposed a spectacle lens edge grinding machine (US-A-4 179 851, DE-A-34 18 329), in reversal of the above conditions a rotatable about a horizontal axis of rotation, otherwise but stationary grinding wheel package has. Of Further, this machine for simultaneous edge processing of two lenses two pairs of coaxial lenses support shafts on, aligned parallel to the tool axis of rotation are. Every pair of eyeglass lens holding shafts is here associated with a (X-Y) cross slide assembly, so that the respective to be machined on the edge and between the spectacle lens holding shafts of a pair of clamped spectacle lenses in respect of the grinding wheel package radial direction and parallel to Rotary axis of the grinding wheel package can be moved.

Finally, DE-U-298 23 464 discloses a concept in which for accelerated production of left and right lenses for a spectacle frame a conventional processing machine for molding the left lens and a another conventional processing machine for molding of the right spectacle lens via a conveyor and a Handling device are linked together.

Although with the known solutions described above Edge processing of spectacle lenses accelerated in principle become. For industrial use, in which over longer Periods also relatively large numbers to edit are without any problems in terms of processing quality, In particular, the known solutions seem in the face However, their mechanical structure is only very suitable.

For the sake of completeness, it should be mentioned in this context that there are also proposals in the art a spectacle lens edge processing machine an additional Provide tool that serves to grooves on the circumference of the machined spectacle lens or holes or grooves to attach to the lens and / or the edges of the lens chamfer. This additional tool makes a move or re-clamping the spectacle lens into another (s) Processing machine dispensable and accelerated insofar also the edge processing. Solutions are known here, in which (1) the additional tool with respect to a cross slide assembly in two mutually perpendicular Directions is movable main tool and is driven by the rotary drive of the main tool with (DE-A-43 08 800), (2) the additional tool with respect to a fixed main tool from a rest position to a machining position is pivotable to the main tool in drive connection and the spectacle lens in machining engagement to arrive (EP-A-0 820 837), as well as solutions in which (3) the additional tool with its own rotary drive provided with respect to a stationary main tool of one Rest position is pivotable in a machining position, in order to work with the spectacle lens (DE-A-198 34,748).

The invention is based on the prior art according to the EP-A-0 917 929 is based on the object, as simple as possible and compact trained edge processing device to provide an optical lens, in particular a spectacle lens, in terms of throughput and processing quality meets industrial requirements.

This object is achieved by the specified in the patent claim 1 and 13, respectively Characteristics solved. Advantageous or expedient developments The invention are the subject of claims 2 to 12 and 14 to 20.

In a device for edge processing of an optical Lens, in particular a spectacle lens, between two aligned, about a workpiece axis rotatable support shafts is clamped, with a first slide, which is connected to a Base frame in a first parallel to the workpiece axis of rotation Direction is guided longitudinally displaceable, and a tool spindle with an edge processing tool for the optical Lens carrying second carriage, which at the first Carriage in a second direction perpendicular to the first direction Direction is guided so longitudinally displaceable that the edge processing tool with the optical lens in machining engagement can be brought, according to the invention, the base frame in formed essentially O-shaped and surrounds the first Carriage, wherein the first carriage also substantially O-shaped and surrounds the second carriage. With In other words, the sleds are with respect to the base frame in an open rectangular frame construction telescopically nested.

Such a configured device has a compact design due to the through the O-shaped configuration of the base frame and the first sled conditional closed Force flow has a very high rigidity, which allows in the case of delivery movements and - where technologically possible - also at the feed movements higher speeds and Accelerations to drive than in conventional edging machines was possible. Investigations of the applicant have shown that the times required for edge processing contrasted by the inventive design of the device the known edge processing machines in comparable Edge processing tools (grinding wheels, milling cutters or combinations thereof) significantly reduced and thus productivity can be increased significantly without this would be detrimental to the quality of the processing. Even with longer Use, as usual in industrial production, becomes one consistently good machining quality achieved because the O-shaped Training the base frame and the first carriage also provides for a thermal symmetry in which by the heating of the involved drive and processing components compensate each other occurring thermal expansion.

The claims 2 to 5 give in particular for a thermal invariant behavior advantageous embodiments of Edge processing device again. So is according to the claim 2 on each side of the base frame each have a linear guide provided for the first carriage, wherein the linear guides on the base frame parallel to each other. The claim 3 provides that each linear guide for the first carriage a mounted on the base guide rail and two guide shoes engaging with the guide rail having in symmetrical arrangement at the first Sleds are attached. According to the teaching of claim 4 is on both sides of the first carriage each a linear guide provided for the second carriage, wherein the Linear guides on the first carriage parallel to each other. According to the patent claim 5 finally each linear guide for the second carriage one at the first Slide-mounted guide rail and two with the guide rail engaging guide shoes that are in symmetrical Arrangement are attached to the second carriage.

Preferably, the first carriage and / or the second Slide by means of a hollow shaft servo motor movable, the a rotatable nut having with a non-rotatable ball screw is in operative engagement, as in claim 6 specified. This embodiment of the device allows in Advantageously, a further optimization of the speeds and accelerations of the feed and feed movements, at the same time good linear positioning accuracy and over known constructions with additional transmission elements, such as drive belts or clutches, reduced Space requirement. This optimization potential in the delivery and feed movements is primarily due to in that the rotationally fixed arrangement of the ball screw, which required for rotating spindles, the Axialkraft limiting end bearing makes dispensable, for a increased axial rigidity and higher torsional rigidity the ball screw ensures. In addition, the problem occurs bending-critical speeds at a rotationally fixed ball screw not up. In the sum are higher speeds and accelerations possible.

According to the patent claim 7, the hollow shaft servomotor for the first carriage attached to the base frame while the Ball screw preferably centrally on the first carriage is rotatably attached. This has the advantage that the thus stationary hollow shaft servo motor for delivery and Feed movements are not accelerated or decelerated got to. On the other hand ensures the central attack of the ball screw advantageously on the first carriage, that no tilting moments are introduced into the first slide, the u.a. the smoothness of the adjustment detrimental could be. The same applies to the design the device according to claim 8, according to which Hollow shaft servo motor for the second carriage preferably mounted centrally on the second carriage while the ball screw rotatably attached to a yoke plate, the firmly connected to the first carriage.

According to the teaching of claim 9, the with the hollow shaft servo motor for the second carriage cooperating Ball screw spindle in relation to usual spindle pitches, which are about 5 mm, large slope, the between 20 and 35 mm, more preferably between 25 and 30 mm lies. The gear effect of this large pitch of the ball screw allows the peripheral edge of the machined Spectacle lenses quickly and without the risk of breaking or damaging the spectacle lens can, where due to the low on the ball screw on second carriage applied axial force also slipping of the spectacle lens clamped between the support shafts reliably avoided during processing. Such Slipping may occur e.g. by no means occur if that too processing lens with respect to the optical axis angularly aligned near part or a cylindrical one or prismatic grinding whose axis position in a to the position of the spectacle frame mounted in the spectacle lens predetermined Relationship must stand. In addition to this sensitivity of the Feed movement during machining, that of control the machining process is conducive, has the transmission effect the great pitch of the ball screw yet the advantage that the Zustellbewegungen the second slide very can be done quickly.

According to the patent claim 10 is the tool spindle with the edge processing tool appropriate in the working space, the one comprising the base frame and the carriages Axis structure by means of a mounted on the first carriage Slider and the second carriage surrounding roll or Bellows is separated, which between the slide and the tool spindle is arranged. These separation measures are advantageously the ease of delivery and Feed movements conducive.

The claim 11 provides that the first direction vertically runs while the second direction is horizontal. Due to the parallelism between the first direction and Workpiece rotation axis vertical arrangement of the support shafts for the to be processed optical lens has the advantage that in particular an automatic loading of the device by means suitable handling equipment, as in industrial Manufacturing would be appropriate, easier to accomplish leaves.

According to the teaching of claim 12 is in advantageous Way for weight balance for the carriage a weight compensation device provided, one end preferably is supported centrally on the base frame, while the other end preferably centrally connected to the first carriage. Due to this configuration, the drive for the first Sled so not the full weight of the sled and the lift or hold components attached to it, which in particular in terms of the maximum possible speeds and accelerations of the vertical movements is advantageous. The central arrangement of the weight compensation device with respect prevents the base frame and the first carriage again advantageously the introduction of tilting moments in the first slide, the ease of vertical movements could be detrimental. As weight compensation device can e.g. a pneumatic cylinder that over a pressure regulator is optionally druckbeaufschlagbar, or a Spring element used. Alternatively to this embodiment would also be a counterweight for the sledges with appropriate Force deflection via, for example, a lever conceivable; Such an embodiment is compared to a only linear acting counterbalancing device due to larger space requirements and because of the higher moving Masses less preferred.

According to another aspect of the present invention is at a device for edging an optical lens, in particular a spectacle lens which is aligned between two can be clamped about a workpiece axis rotatable support shafts is, with a first slide, attached to a base frame in a first parallel to the workpiece axis of rotation Direction is guided longitudinally displaceable, and a tool spindle with a (first) edge editing tool for the optical lens carrying the second carriage, which on the first carriage in a direction perpendicular to the first direction second direction is guided so longitudinally displaceable, that the (first) edge processing tool with the optical lens can be brought into machining engagement, on the second carriage an additional processing device attached, the at least another edge processing tool for the optical Lens, which from a parking position to a processing position between the optical lens and the (first) Edge processing tool on the tool spindle is movable.

With the additional processing device can depending on Design of the other edge processing tool in addition for provided on the tool spindle first edge processing tool possibly necessary further processing operations, like attaching holes or grooves to a lens, be performed without the optical lens off their clamping should be removed, what the edge processing also accelerated. This is in an advantageous Way the existing, the base frame and the sled comprehensive Axis construction used, i. additional controlled Axes for the other edge processing tool and the so associated costs are expendable. The processing is done the optical lens with the provided on the tool spindle first edge processing tool is the other Edge processing tool in its parking position. For another Processing the optical lens with the other edge processing tool This will be from his parking position in moves its machining position, in which it is between the optical lens and the first edge processing tool on the Tool spindle, i. in the direction of the machining feed seen before the first edging tool is located, so that the latter is not in the way of further processing. It can be seen that now the feed and feed movements further edge processing tool as the movements of the first edge editing tool can be controlled, where only the distance between the first edge processing tool and the other edge processing tool control technology is to be considered.

In an advantageous embodiment according to the claim 14, the additional processing device has its own Housing on which is flanged to the second carriage. This modular design allows the device to be optional without difficulty with the additional processing facility be retrofitted.

The claim 15 provides that the additional processing device having a pivot mechanism, by means of the rest of the edge processing tool from the parking position is pivotable in the machining position. Such a Swing mechanism allows in an advantageous manner with only one degree of freedom, a movement of the other edge processing tool in the space between the first edging tool and the optical lens to be processed, i. a movement of the further edging tool around the first edge processing tool around. It has the pivot mechanism according to the patent claim 16 expedient one on the housing mounted pivoting lever as well as a simple linear Swivel drive, with one end on the housing and with his the other end is articulated on the pivot lever, which is at the linear pivot drive preferably to a pneumatic cylinder is.

According to the teaching of claim 17, the further edge processing tool by means of a particular of the rotary drive the first edge processing tool independent rotary drive rotated about a rotation axis. In a rotating further edge processing tool may be here, for example around a drill or end mill for training Drill holes or grooves in the edge region of a spectacle lens, for fixing the spectacle lens in a spectacle frame needed become. Also grinding wheels for attaching roof facets and / or Sicherheitsfasen on the lens edge are conceivable; of additional tools for attachment of grooves or grooves on the peripheral edge of the spectacle lens, with geometrically indeterminate Cutting, such as sintered diamond discs, or geometric certain cutting edges, such as saw blades or disc cutters. According to The patent claim 18 here runs the axis of rotation the edge processing tool expedient parallel to the axis of rotation of the provided on the tool spindle first edge editing tool.

According to claim 19, the rotary drive for the additional edge processing tool attached to the pivot lever, what the transmission of torque to the other edge processing tool relieved, the axis of rotation of the Rotary drive perpendicular to the axis of rotation of the other edge processing tool runs. The latter is a compact one Construction conducive, with a reversal of torque simple way by means of, for example, a bevel gear pairing or a flexible shaft can take place.

In an advantageous embodiment of the device according to the Claim 20 has the additional processing device finally a rotationally driven by means of the rotary drive Tool holder, which has a first clamping mechanism for radial Clamping a margining tool and a second Clamping mechanism for axially clamping at least one Edge processing tool has. By providing these different Clamping mechanisms may be both e.g. Drill or End mill radially clamped as well as e.g. Grinding wheels, Saw blades or disc cutters, possibly also in combination, be axially clamped, so that the additional processing device according to the respective requirements of the intended Edge processing can be equipped.

At this point it should be mentioned that the above described Construction of the device with a tool spindle for a first edge processing tool and an additional processing device for at least one other edge processing tool the most diverse tool combinations and thus the implementation of different processing methods allowed. Thus, e.g. as first edging tool a combination tool with a grooved cutter for Production of the peripheral contour and possibly a Dachfacette a Spectacle lens and a grinding wheel for polishing the possibly provided with a Dachfacette provided spectacle lens circumference while the additional processing facility as above described with tools for the formation of holes, grooves, Grooves and / or bevels in the edge region of the spectacle lens can be equipped. It is also conceivable to manufacture the peripheral contour of spectacle lenses on the additional processing device to shift, being another edge processing tool also laser or water jet cutting heads can be used, in particular the implementation of separating cuts serve to form the peripheral contour. The faceted and polishing processing of the spectacle lens periphery and the Formation of chamfers could in this case by means of the first Edge processing tool done. Not least, this flexibility in terms of suitable tools and feasible Method makes the device described here especially attractive for industrial use.

Fig. 1

eine perspektivische, teilweise aufgebrochene Ansicht einer erfindungsgemäßen Vorrichtung von seitlich/oben,

Fig. 2

eine perspektivische Ansicht der Vorrichtung gemäß Fig. 1 von vorne/oben, wobei zur Veranschaulichung gegenüber der Darstellung in Fig. 1 einige Komponenten weggelassen worden sind, so daß im wesentlichen das Grundgestell, der erste und der zweite Schlitten sowie die zum ersten Schlitten gehörenden Führungs- und Antriebskomponenten der Vorrichtung gezeigt sind,

Fig. 3

eine perspektivische, teilweise aufgebrochene Ansicht der Vorrichtung gemäß Fig. 1 von hinten/oben, wobei zur Vereinfachung der Darstellung gegenüber Fig. 1 der Antrieb für den ersten Schlitten, die am zweiten Schlitten befestigte Werkzeugspindel für das erste Randbearbeitungswerkzeug sowie die von unten an den zweiten Schlitten angeflanschte zusätzliche Bearbeitungseinrichtung weggelassen worden sind,

Fig. 4

eine teilweise geschnittene und abgebrochene Seitenansicht der Vorrichtung, die Details der Antriebskomponenten für den zweiten Schlitten in einem gegenüber den Fig. 1 bis 3 vergrößerten Maßstab zeigt,

Fig. 5

eine teilweise geschnittene Seitenansicht der vom zweiten Schlitten abgenommenen zusätzlichen Bearbeitungseinrichtung, deren Randbearbeitungswerkzeuge sich in ihrer Parkposition befinden, wobei auch die Werkzeugspindel für das erste Randbearbeitungswerkzeug angedeutet und ein zwischen den Haltewellen eingespanntes, zu bearbeitendes Brillenglas gezeigt ist,

Fig. 6

eine vergrößerte Darstellung des Details VI in Fig. 5,

Fig. 7

eine teilweise aufgebrochene Draufsicht auf die zusätzliche Bearbeitungseinrichtung gemäß Fig. 5, wobei sich deren Randbearbeitungswerkzeuge in ihrer Parkposition befinden, und

Fig. 8

eine teilweise aufgebrochene Draufsicht auf die zusätzliche Bearbeitungseinrichtung gemäß Fig. 5, wobei sich deren Randbearbeitungswerkzeuge in ihrer Bearbeitungsposition befinden.

In the following the invention with reference to a preferred embodiment with reference to the accompanying, partially schematic drawing will be explained in more detail. Show:

Fig. 1

a perspective, partially broken view of a device according to the invention from the side / top,

Fig. 2

a perspective view of the device of FIG. 1 from the front / top, with some components have been omitted for illustrative purposes over the representation in Fig. 1, so that essentially the base frame, the first and the second carriage and the guide belonging to the first carriage and drive components of the device are shown,

Fig. 3

a perspective, partially broken view of the device of FIG. 1 from the rear / top, wherein for ease of illustration with respect to FIG. 1, the drive for the first carriage, the second carriage mounted tool spindle for the first edge processing tool and the bottom of the second Carriage flanged additional processing device have been omitted,

Fig. 4

2 is a partially sectioned and broken side view of the apparatus showing details of the drive components for the second carriage in an enlarged scale compared to FIGS. 1 to 3;

Fig. 5

a partially sectioned side view of the removed from the second carriage additional processing device, the edge processing tools are in their parking position, wherein also the tool spindle for the first edge processing tool indicated and a clamped between the support shafts to be processed spectacle lens is shown,

Fig. 6

an enlarged view of the detail VI in Fig. 5,

Fig. 7

a partially broken plan view of the additional processing device according to FIG. 5, wherein the edge processing tools are in their parking position, and

Fig. 8

a partially broken plan view of the additional processing device according to FIG. 5, wherein the edge processing tools are in their processing position.

In Figs. 1 to 3 is a device for edge processing an optical lens L in the form of a spectacle lens, that for his editing between two only schematically shown axially aligned, i. coaxial holding shafts 10, 12 is clamped around a CNC-controlled workpiece axis of rotation R are rotatable. The device has a first one or Z-slide 14 which is connected to a base frame 16 in a for Workpiece axis of rotation R parallel first direction - in the illustrated Embodiment, the vertical direction Z - longitudinally displaceable is guided. Furthermore, the device has a second or X-carriage 18, the one generally as a tool spindle 20 designated processing device contributes to the one shown only schematically in Fig. 1 first Edge processing tool 22 for the optical lens L mounted is. This carriage 18 is on the Z-carriage 14 in a to the first direction Z vertical second direction - in the illustrated Embodiment, the horizontal direction X - guided longitudinally displaceable. It can be seen that the first Edge processing tool 22 by means of a movement of the carriage 18 and 14 in relation to the optical to be processed Lens L radial direction or parallel to the axis of rotation R of optical lens L can be moved to a specific Longitudinal section of the first edge processing tool 22 with the bring the optical lens L in machining engagement.

As best seen in Fig. 2, the base frame 16 seen in cross-section substantially O-shaped and surrounds or encloses the Z-carriage 14, so that this in a substantially O-shaped opening 24 of the base frame 16 in the vertical direction Z, i. moved up and down can be. The Z-slide 14 is in turn in cross section Seen substantially O-shaped and surrounds or encloses the X-carriage 18, so that this in a substantially O-shaped recess 26 of the Z-carriage 14 in the horizontal direction X, i. be moved back and forth can. Due to the substantially O-shaped design of the Base frame 16 and the Z-carriage 14 is a result of thus given given power flow high rigidity as well as due to the symmetries present in the result achieved very good thermal stability, what the one described here Device predestined for industrial use.

Regardless of it is further important that the second or X-carriage 18 an additional processing device 28 is attached - as in particular with reference to the Fig. 5 to 8 will be described in more detail below - the at least one further, in the illustrated embodiment several other edge processing tools 30 for the optical Lens L, which of a in Figs. 1, 5 and 7 parking position or rest position in a in Fig. 8 shown processing position can be moved in the the other edge processing tools 30 between the optical lens L and the first edge processing tool 22 or the tool spindle 20 are located. Thus, the delivery and Feed movement of the further edge processing tools 30 in radial direction with respect to the optical lens L to be processed Direction or parallel to the rotation axis R of the optical lens L. with the intended for the first edge processing tool 22 X-Z axis control, i. without much extra Control effort for the other edge processing tools 30th

The device shown in the figures is an integral part a lens edge processing machine whose other components not shown here for simplicity of illustration. So this is done as a welded or cast construction Base frame 16 shown in FIGS. 1 to 3, on both sides the base frame 16 provided flange portions 32nd by means of suitable fasteners, such as screws on a machine frame (not shown) attached. On the machine frame is also a workpiece drive and tensioning device attached to the optical lens L to be processed, from that in Figs. 1 and 5, only the support shafts 10 and 12th are shown schematically, synchronously about the workpiece axis of rotation R can be driven and for tensioning the optical Lens L by means of a lifting device in the axial direction are adjustable relative to each other. Further contributes the machine frame covers the complete panel of the lens edge processing machine, an operating unit with input devices (e.g., keyboard, data readers, etc.) and output devices screen, printer, etc.) and, if applicable, handling or transport equipment or systems for the to be processed or processed optical lenses L, as they are e.g. in the older German patent application 100 29 966.0-22 of the Applicant to be discribed. Finally, on the machine frame a control cabinet to accommodate a common industrial control attached, all the movements of the lens edge processing machine controls.

According to Fig. 1, the tool spindle 20 has a spindle housing 34, with which the tool spindle 20 is flanged to a best seen in Fig. 2 end face 36 of the X-carriage 18 so that the axis of rotation C _{1 of} the edge processing tool 22 parallel to the Workpiece axis of rotation R runs. In the spindle housing 34, a tool shaft is rotatably mounted, on which the first edge processing tool 22 is attached and which can be driven by means of a rotary drive 38 which is flanged to the spindle housing 34 at the upper end of the spindle housing 34 in FIG. The first edge processing tool 22 is formed in the illustrated embodiment as a combination tool with different processing sections, which may include milling, grinding and / or polishing sections. The tools that are possible here and the edgebanding methods that can be carried out with them are well known to the person skilled in the art and will therefore not be described in greater detail here.

Furthermore, a nozzle arrangement 40 is shown in FIG Spindle housing 34 is attached and serves, during the Processing the optical lens L Coolant in the area between the optical lens L and the first edge processing tool 22 to spray to tool and workpiece too cool and remove chips or the machining abrasion.

The support lenses 10, 12 clamping the optical lens L protrude in a working space, in which also the tool spindle 20 is located with the first edge processing tool 22 and the outward through the not shown in the figures Panel of the lens edge processing machine separately is. Of which the base frame 16 and the carriage 14, 18 comprehensive Axle structure is the working space by means of a Z-slide 14 attached telescopic plate or slider 42 as well one of the X-carriage 18 and the additional processing device 28 surrounding bellows 44 separately. The bellows 44 is seen in the horizontal direction X between the slider 42 and the tool spindle 20 and arranged with its ends on the slider 42 and the spindle housing 34 of the Tool spindle 20 attached. In Fig. 1, the bellows 44th shown broken to a housing 46 of the additional Processing device 28 to show which from below to the X-carriage 18 is flanged. The other edge processing tools 30 of the additional processing device 28 finally stand in their parking position by a corresponding Recess in the spindle housing 34 of the tool spindle 20 in the workspace before. There are suitable ones here Sealing measures taken to prevent the in the work space cooling fluid spouting during processing in the housing 46 of the additional processing device 28 penetrates.

As can be seen in particular FIGS. 2 and 3, is too both sides of the O-shaped opening 24 of the base frame 16th in each case a vertically arranged linear guide 48 for as Weld or cast construction formed Z-carriage 14th intended. The linear guides 48 are symmetrical Arrangement on the base frame 16 parallel to each other. Each of the linear guides 48 for the Z-carriage 14 has a on the base frame 16 by means of screws, for example, fastened guide rail 50 and two engaging with the guide rail 50 Carriage or guide shoes 52. The guide shoes 52 are in turn in symmetrical arrangement below and above with help from e.g. Screws on the Z-carriage 14 attached.

Further, on each side of the Z-carriage 14 is one each Linear guide 54 for as a welded or cast construction trained X-carriage 18 is provided. The linear guides 54 run in a symmetrical arrangement on the Z-carriage 14 in parallel to each other and in a to the course of the linear guides 48 on the base frame 16 vertical direction. Each of the linear guides 54 for the X-carriage 18 has an on by ribs additionally stiffened Z-carriages 14 from below by means of e.g. Screw-mounted guide rail 56 and two with the guide rail 56 engaging carriage or guide shoes 58 on. The guide shoes 58 are in turn in a symmetrical arrangement from the top of the X-carriage 18 with the help of example Fastened screws.

In the linear guides 48 for the Z-carriage 14 and the linear guides 54 for the X-carriage 18 may be in the Trading available purchase modules or parts, where the guide shoes 52 and 58 each with lubricated ball chains can be equipped, the smooth in the longitudinal direction and in the transverse direction play in each assigned Longitudinal grooves of a dovetail-shaped section in cross-section the corresponding guide rail 50 and 56 run.

For generating the linear movements of the carriages 14 and 18 are provided CNC-controlled hollow shaft servo motors 60 and 62, each one rotatable nut, not shown here have, which with a respective associated, end rotatably clamped ball screw 64 and 66 in operative engagement stands. As shown particularly in FIG. 2, the Hollow shaft servo motor 60 for the Z-carriage 14 at the top of the base frame 16 flanged. The associated ball screw 64 is rotatably attached to the Z-carriage 14. It engages in the illustrated embodiment, the ball screw 64th on the Z carriage 14 in a direction perpendicular to the X and Z directions Direction seen in the middle.

The hollow shaft servomotor 62 for the X-carriage 18 is as Fig. 3 shows, in the illustrated embodiment in seen in a direction perpendicular to the X and Z directions mounted centrally on the X-carriage 18, so that the hollow shaft servomotor 62 together with the X-carriage 18 can proceed. The the hollow shaft servomotor 62 associated ball screw 66 is non-rotatably by means of a nut 68 on a yoke plate 70th fixed in a direction perpendicular to the X and Z directions Direction to the remote from the tool spindle 20 End of the X-carriage 18 like a bridge over the X-carriage 18th extends and is firmly connected to this.

While the ball screw 64 for the linear movement of the Z-slide 14 has a common thread pitch of e.g. 5 mm stroke has per revolution, as shown in FIG. 4, the ball screw 66 for the linear movement of the X-carriage 18th a contrast, significantly larger slope, the between 20 and 35 mm stroke per revolution and in the here shown Embodiment at about 30 mm stroke per revolution is, so that due to the transmission effect of the ball screw 66 via the hollow shaft servo motor 62 only relatively small Forces can be applied in the X direction.

As best seen in Fig. 3, is to balance the weight for the carriages 14 and 18 and the attached Components here a linear-acting counterbalancing device 72 provided one end over a on the base frame 16 fixed welding frame 74 centered on the base frame 16 is supported while the other end of the counterbalancing device 72 attached via a on the Z-carriage 14 Bearing 76 is centrally connected to the Z-carriage 14 is. In the illustrated embodiment, it is at the weight balancer 72 about a in a parallel arrangement to the hollow shaft servo motor 60 for the Z-carriage 14th arranged gas tension spring. But instead of a gas tension spring is The use of a pneumatic cylinder conceivable, the over a pressure regulator optionally be pressurized can to the carriages 14 and 18 to the respective requirements according to variable to brake or hold.

Finally, it should also be noted at FIGS. 1 to 4 that that also signal generator 78 are shown, in cooperation with encoders, not shown here on the hollow shaft servomotors 60 and 62 of the situation recording and control the carriages 14 and 18 serve.

Figs. 5 to 8 are details of the additional processing device 28, the housing 46 on the in FIG. 5 left end has a stop surface 80, with the additional Processing device 28 when mounted on the X-carriage 18 at a stop surface 82 shown in Fig. 3 on the X-carriage 18 comes to the plant to the additional processing facility 28 in the X direction defined on the X-carriage 18 to position.

Referring particularly to Figs. 7 and 8, the additional processing means 28 a pivot mechanism 84, by means the other edge processing tools 30 of their in Parking position shown in Fig. 7 shown in FIG Machining position can be pivoted. The swivel mechanism 84 has a pivot lever 86, which with a End at the in Figs. 7 and 8 upper right corner of the substantially cuboidal housing 46 pivotally about a Swivel axis S is mounted, which runs in the Z direction. At its other end is the pivot lever 86 of FIG. 7 for Recording a rotary drive 88 for the other edge processing tools 30 formed, which via a drive housing 90th is flanged to the pivot lever 86. The rotation axis D the rotary drive 88, which is an electric or can operate pneumatically driven engine, runs vertically to the pivot axis S.

Between the pivot axis S and the rotary drive 88 is on Swivel lever 86 is a linear pivot drive 92 with his one end articulated while the other end of the pivot drive 92 substantially in the center of the in Figs. 5, 7 and 8 left wall of the housing 46 of the additional processing device 28 is articulated. In the pivot drive 92 acts it is in the illustrated embodiment to a Pneumatic cylinder whose cylinder housing 94 on the housing 46 of additional processing device 28 and its length-adjustable Piston rod 96 hinged to the pivot lever 86 is. It can be seen that the piston rod 96 through via connections 98 taking place, optionally opposing pressurization of the piston received in the cylinder housing 94 out of the cylinder housing 94 and retractable to the Pivot lever 86 through an opening 100 in the housing 46 of the additional Processing device 28 from the parking position in to pivot the machining position and vice versa.

Finally, it must be noted that the pivoting mechanism 84 in the vicinity of the pivot axis S, an arm 102 on the pivot lever 86 is attached, the end carries a shock absorber 104, whose housing is adjustable in length or adjustable on the arm 102nd is attached. The shock absorber 104 may pivot during pivoting of the pivot lever 86 from the parking position to the processing position with a on the housing 46 of the additional processing device 28 provided stop surface 106 to the plant reach. As the the machining position of the pivot lever 86 together with the stop surface 106 determining end stop serves a screwed onto the housing of the shock absorber 104 Threaded sleeve 108. From Fig. 7 it can be seen that the shock absorber 104 in the parking position of the pivot lever 86 from the Threaded sleeve 108 protrudes, so that the shock absorber 104 at a Pivoting the pivot lever 86 in the processing position the stop of the threaded sleeve 108 on the stop surface 106th can dampen.

As can be seen in particular FIGS. 5 and 6, is connected to the Drive housing 90 an angle head 110 flanged, the two having interconnected bore portions 112 and 114, whose center axes enclose a right angle. In the bore portion 112 projects a shaft 116 of the rotary drive 88 in the end provided with a bevel gear 118 is. The bevel gear 118 meshes with a bevel gear 120 same Diameter, which at one end of a in the bore section 114 rotatably mounted shaft 122 attached is. The fixed bearing 124 of the shaft 122 is by means of a in a threaded portion 126 of the bore portion 114 screwed Ring member 128 against an annular shoulder 130 of the bore portion 114 braced. The two floating bearings 132 of the shaft 122 are by means of a on a bevel gear side threaded portion 134 of the shaft 122 screwed on shaft nut 136th clamped by a spacer sleeve 138 with the fixed bearing 124. The shaft 122 finally extends by means of a sealing element 140 on the ring member 128 sealed therethrough.

At the lower end of the shaft 122 in FIG. 6, a tool holder 142 rotationally driven by the rotary drive 88 about the rotation axis C _{2 of} the shaft 122 via the shaft 116, the bevel gear pair 118, 120 and the shaft 122 is mounted for the further edge processing tools 30. From Figs. 5 to 8 it can be seen that the axis of rotation C _{2 of} the other edge processing tools 30 at a right angle to the axis of rotation D of the rotary drive 88 and parallel to the axis of rotation C _{1 of} the first edge processing tool 22 and thus parallel to the axis of rotation R of the optical lens L extends , Further, as is apparent from a comparison of FIGS. 7 and 8, the further edge processing tools 30 can be pivoted by means of the pivoting mechanism 84 from the parking position virtually around the tool spindle 20 and the first edge processing tool 22 into the processing position in which the axes of rotation C ₁ and C _{2 of} the tools 22, 30 and the axis of rotation R of the optical lens L lie in a plane extending parallel to a plane spanned by the X and Z directions.

The tool holder 142 has a first clamping mechanism 144 for radially tensioning one of the further edge processing tools 30 and a second independent clamping mechanism 146 for axially tensioning at least one other of the others Edge processing tools 30, as described below shall be.

The first clamping mechanism 144 has a collet 148, the starting from its lower in Fig. 6, with a longitudinal slot 150 provided end outer peripheral side a key surface portion 152, a conical surface portion 154 and a Has threaded portion 156 and the inner peripheral side with a bore is provided for receiving the here as end mill 158 trained further edge processing tool 30 serves. From Fig. 6 it is seen that when screwing the threaded portion 156 of the collet 148 in a mating threaded portion a basic body 160 of the tool holder 142 the conical surface portion 154 of the collet 148 at a conical counter surface on the inner circumference of the base 160 to Plant arrives. In another screwing the collet 148 in the body 160 allows in the axial direction extending across the conical surface portion 154 Longitudinal slot 150 a radially inwardly directed Deformation of the collet 148, whereby the end mill 158 is clamped radially. Instead of the end mill 158 can here corresponding to the respective requirements of edge processing also another tool, e.g. a drill used become.

The second tensioning mechanism 146 is replaced by an annular shoulder 162 on the base body 160, possibly spacers 164 and a Threaded ring 166 formed on the inner circumference with a threaded portion provided on an outer peripheral side counter-threaded portion at the lower end of the main body 160 in FIG. 6 can be screwed on. It can be seen that one or several other edge processing tools 30, in the illustrated Embodiment, a sintered diamond wheel 168, the is arranged between the spacers 164, axially tensioned can be, by the / from the spacers 164 and the diamond wheel 168 existing sandwich or package by screwing the threaded ring 166 on the counter-threaded portion of the base 160 against the annular shoulder 162 of the Main body 160 is stretched. Instead of the diamond wheel 168 can here the respective requirements of the edge processing accordingly another tool, e.g. a saw blade or a disc milling cutter can be clamped axially. In this Context should be mentioned that the spacers 164 formed in the present case as grinding wheels are, i. outer peripheral side with grinding wheels 170 are provided, which form a conical outer peripheral surface. By means of the grinding wheels 170 chamfers can be at the edge of the optical Lens L are attached.

It will be apparent to those skilled in the art that with little setup effort by means of the described further edge processing tools 30 according to the requirements of drilling, Grooves, grooves and / or bevels in the edge region of the optical Lens L can be attached. Instead of rotating Tools are as more edging tools too Cutting heads conceivable for laser or water jet cutting, which could be attached to the pivot lever 86.

It is a device for edge processing of an optical Lens that is between two aligned, about a workpiece axis of rotation rotatable holding shafts is clamped, disclosed with a Z-slide mounted on a base frame in a to Workpiece rotation axis parallel Z-direction longitudinally displaceable is guided, and a tool spindle with an edge processing tool carrying X-carriage, which on the Z-slide in a direction perpendicular to the Z-direction X-direction such guided longitudinally displaceable that the edge processing tool can be brought into machining engagement with the lens. For industrial use of the device is according to the invention the base frame formed substantially O-shaped and surrounds the Z-slide, which is also essentially O-shaped and surrounds the X-carriage. In addition or alternatively it is provided that on the X-carriage an additional processing device is attached, which has at least one further edge processing tool, which from a parking position to a processing position between the lens and the edge processing tool on the Tool spindle is movable.

LIST OF REFERENCE NUMBERS

10

upper support shaft

12

lower support shaft

14

Z slide

16

base frame

18

X slide

20

tool spindle

22

first edge processing tool

24

opening

26

recess

28

additional processing device

30

further edge processing tools

32

flange

34

spindle housing

36

face

38

rotary drive

40

nozzle assembly

42

pusher

44

bellow

46

casing

48

linear guide

50

guide rail

52

guide shoe

54

linear guide

56

guide rail

58

guide shoe

60

Hollow shaft servomotor

62

Hollow shaft servomotor

64

Ball screw

66

Ball screw

68

mother

70

yoke plate

72

Weight balancer

74

welding frame

76

bearing block

78

signaler

80

stop surface

82

stop surface

84

swivel mechanism

86

pivoting lever

88

rotary drive

90

drive housing

92

Rotary actuator

94

cylinder housing

96

piston rod

98

connections

100

opening

102

poor

104

shock absorber

106

stop surface

108

threaded sleeve

110

angle head

112

bore section

114

bore section

116

wave

118

bevel gear

120

bevel gear

122

wave

124

fixed bearing

126

threaded portion

128

ring part

130

annular shoulder

132

movable bearing

134

threaded portion

136

shaft nut

138

Stand Off

140

sealing element

142

tool holder

144

first clamping mechanism

146

second clamping mechanism

148

collet

150

longitudinal slot

152

Key surface section

154

conical surface section

156

threaded portion

158

end mill

160

body

162

annular shoulder

164

spacer

166

threaded ring

168

diamond wheel

170

abrasives

C ₁

Rotation axis of the first edge processing tool

C ₂

Rotation axis of the other edge processing tools

D

Rotation axis of the rotary drive 88

L

optical lens

R

CNC-controlled workpiece axis of rotation

S

swivel axis

X

CNC-controlled horizontal axis

Z

CNC-controlled vertical axis

Claims (20)

1. A device for edge-machining an optical lens (L), in particular a spectacle lens, which may be clamped between two aligned holding shafts (10, 12) rotatable about a rotational axis (R) of a workpiece, having a first slide (14), which is guided longitudinally displaceably on a base frame (16) in a first direction (Z) parallel to the rotational axis (R) of the workpiece, and a second slide (18) bearing a tool spindle (20) with an edge-machining tool (22) for the optical lens (L), which slide (18) is guided longitudinally displaceably on the first slide (14) in a second direction (X) perpendicular to the first direction (Z) in such a way that the edge-machining tool (22) may be brought into machining engagement with the optical lens (L), characterized in that the base frame (16) is of substantially O-shaped construction and surrounds the first slide (14), wherein the first slide is likewise of substantially O-shaped construction and surrounds the second slide (18).
2. A device according to claim 1, characterized in that a linear guide (48) for the first slide (14) is provided on each side of the base frame (16), the linear guides (48) extending parallel to one another on the base frame (16).
3. A device according to claim 2, characterized in that each linear guide (48) for the first slide (14) comprises a guide rail (50) attached to the base frame (16) and two guide shoes (52) engaging with the guide rail (50), which guide shoes (52) are fixed to the first slide (14) in symmetrical arrangement.
4. A device according to one of the preceding claims, characterized in that a linear guide (54) for the second slide (18) is provided on each side of the first slide (14), the linear guides (54) extending parallel to one another on the first slide (14).
5. A device according to claim 4, characterized in that each linear guide (54) for the second slide (18) comprises a guide rail (56) attached to the first slide (14) and two guide shoes (58) engaging with the guide rail (56), which guide shoes (58) are fixed to the second slide (18) in symmetrical arrangement.
6. A device according to one of the preceding claims, characterized in that the first slide (14) and/or the second slide (18) is movable by means of a hollow shaft servo motor (60, 62), which comprises a rotatable nut, which is in active engagement with a non-rotatable ball screw (64, 66).
7. A device according to claim 6, characterized in that the hollow shaft servo motor (60) for the first slide (14) is attached to the base frame (16), while the ball screw (64) is attached non-rotatably and preferably centrally on the first slide (14).
8. A device according to claim 6 or 7, characterized in that the hollow shaft servo motor (62) for the second slide (18) is attached preferably centrally to the second slide (18), while the ball screw (66) is attached non-rotatably to a yoke plate (70), which is connected firmly to the first slide (14).
9. A device according to one of claims 6 to 8, characterized in that the ball screw (66) interacting with the hollow shaft servo motor (62) for the second slide (18) exhibits a relatively large pitch, which is between 20 and 35 mm, more preferably between 25 and 30 mm.
10. A device according to one of the preceding claims, characterized in that the tool spindle (20) with the edge-machining tool (22) is located in the working chamber, which is separated from the axis system encompassing the base frame (16) and the slides (14, 18) by means of a sliding member (42) fixed to the first slide (14) and a rolling lobe or expansion bellows (44) surrounding the second slide (18), the bellows being arranged between the sliding member (42) and the tool spindle (20).
11. A device according to one of the preceding claims, characterized in that the first direction (Z) extends vertically, while the second direction (X) extends horizontally.
12. A device according to claim 11, characterized in that a weight counterbalancing means (72) is provided for weight counterbalancing for the slides (14, 18), the one end of which means is supported preferably centrally on the base frame (16) while the other end thereof is connected preferably centrally with the first slide (14).
13. A device according to one of the preceding claims, characterized in that an additional machining means (28) is fixed to the second slide (18), which means comprises at least one further edge-machining tool (30) for the optical lens (L), which may be moved from a parked position into a machining position between the optical lens (L) and the edge-machining tool (22) on the tool spindle (20).
14. A device according to claim 13, characterized in that the additional machining means (28) comprises a housing (46), which is flange-mounted on the second slide (18).
15. A device according to claim 13 or 14, characterized in that the additional machining means (28) comprises a swivel mechanism (84), by means of which the further edge-machining tool (30) may be swivelled from the parked position into the machining position.
16. A device according to claim 15, characterized in that the swivel mechanism (84) has a swivel lever (86) mounted on the housing (46) and a linear swivel drive (92), which is coupled at one end to the housing (46) and at its other end to the swivel lever (86), wherein the linear swivel drive (92) is preferably a pneumatic cylinder.
17. A device according to one of claims 13 to 16, characterized in that the further edge-machining tool (30) is driven rotationally about an axis of rotation (C₂) by means of a rotary actuator (88).
18. A device according to claim 17, characterized in that the axis of rotation (C₂) of the further edge-machining tool (30) extends parallel to the axis of rotation (C₁) of the edge-machining tool (22) provided on the tool spindle (20).
19. A device according to claim 17 or 18, characterized in that the rotary actuator (88) for the further edge-machining tool (30) is fixed to the swivel lever (86), the axis of rotation (D) of the rotary actuator (88) extending perpendicularly to the axis of rotation (C₂) of the further edge-machining tool (30).
20. A device according to one of claims 17 to 19, characterized in that the additional machining means (28) has a tool holder (142) driven rotationally by means of the rotary actuator (88), which holder (142) comprises a first clamping mechanism (144) for radial chucking of an edge-machining tool and a second clamping mechanism (146) for axial chucking of at least one edge-machining tool.

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