EP3135430A1 - Device for edging an optical lens and process for producing optical lenses - Google Patents
Device for edging an optical lens and process for producing optical lenses Download PDFInfo
- Publication number
- EP3135430A1 EP3135430A1 EP16001791.9A EP16001791A EP3135430A1 EP 3135430 A1 EP3135430 A1 EP 3135430A1 EP 16001791 A EP16001791 A EP 16001791A EP 3135430 A1 EP3135430 A1 EP 3135430A1
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- EP
- European Patent Office
- Prior art keywords
- edge
- lens
- block piece
- processing device
- tool
- Prior art date
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- 238000007688 edging Methods 0.000 title description 6
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
- B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
- B24B9/146—Accessories, e.g. lens mounting devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
- B24B13/005—Blocking means, chucks or the like; Alignment devices
- B24B13/0057—Deblocking of lenses
Definitions
- the present invention relates generally to a device for processing an edge of a blank for a lens according to the preamble of patent claim 1.
- the invention relates to a device for edge processing of spectacle lenses, as nowadays also in so-called "RX workshops", ie Production facilities for the production of individual spectacle lenses according to prescription on an industrial scale is used.
- the present invention further relates to a method for producing spectacle lenses according to the preamble of patent claim 10.
- the respective “blocked” spectacle lens is known to be on its rear or front surface in terms of their optical effect (especially by prescription) and / or at the edge for fitting in an associated spectacle frame with geometrically defined cutting edge (milling / Turning) and / or geometrically indeterminate cutting (grinding / polishing) machined and / or coated on its back or front surface to achieve additional effects (increase in scratch resistance, anti-reflection properties, mirroring, hydrophobic properties, etc.).
- blocking in optical production generally refers to the process in which an optical workpiece is temporarily fixed on a so-called “block piece” by means of a suitable material (low-melting alloy - so-called “alloy” or adhesive) or the block material is applied to the workpiece to form itself the block piece, which then serves to hold the workpiece in the respective processing machine and / or coating system.
- a suitable material low-melting alloy - so-called “alloy” or adhesive
- that process is called “blocking off”, in which the optical workpiece is separated from the block piece / block material after its (end) processing (on surface and / or edge) and / or coating.
- the preferred field of application is generally referred to as "spectacle lenses” below are optical lenses or blanks for spectacles made of conventional materials such as polycarbonate, mineral glass, CR 39, HI index, etc and with any (pre) shape of the peripheral edge of the lens or of the lens blank, which already processes (pre) and / or (pre-) before blocking on one or both optically active surface (s) and / or edge but you do not have to be.
- the spectacle lens on its surface on which it is blocked, with a film, a paint or the like. be provided to protect this surface from contamination and damage and / or to improve the adhesion properties between the spectacle lens and the block material, without being specifically mentioned in the following.
- This known edge processing device generally comprises a receiving device (holding shafts) for holding the lens blank blocked on the block piece in a working space of the edge processing device, a processing device (tool spindle), by means of a tool (eg a combination tool with milling, grinding and / or polishing sections) for the processing of the lens edge can be driven, and finally a movement means (X and Z carriage) for generating a relative movement between the lens blank and the tool during the processing of the lens edge in the working space of the device.
- a receiving device holding shafts
- a processing device tool spindle
- a movement means X and Z carriage
- the blocked, finished-handed spectacle lens is to be removed from the edge-processing device, whereupon the spectacle lens is still to be blocked by the block piece.
- the prior art in particular also Abblockvoriquesen with a rotatable about a workpiece rotation axis recording for the blocked spectacle lens, in which after insertion of the blocked spectacle lens in the recording via a nozzle, a high-pressure fluid jet in one direction Substantially transversely to the workpiece axis of rotation is delivered to an edge region between the spectacle lens and the block piece to separate the spectacle lens from the block piece.
- the block-piece lens pair has to be removed from the workpiece chuck and possibly held on the lens side, so that the coupling part can be slotted by means of a saw or a milling cutter.
- the slot is so deep (residual wall thickness of the block piece of about 1 to 2 mm in front of the lens) that closes during the subsequent deformation or compression of the coupling part of the slot at least partially and thereby dissolves the lens at least from a part of the receiving surface.
- the invention has the object of developing the above-described prior art device and process side so that the handling in connection with the blocking of the treated, in particular the edge processed lens is simplified and improved by the block piece, while minimizing the risk of lens damage.
- an apparatus for processing an edge of a blank for a lens comprising a receiving device for holding the blocked on a block piece lens blank in a working space of the edge processing device, a processing device by means of a tool for the Machining of the edge is drivable, and a moving means for generating a relative movement between the lens blank and the tool during the processing of the edge in the working space of the edge processing device, also comprises a blocking device by means of which the edge-processed lens in the working space of the edge processing device from the block piece can be blocked off.
- the arrangement is preferably made such that the receiving device is adapted to the blocked on the block piece lens blank around a workpiece axis of rotation to rotate.
- the blocking device may comprise a pencil-shaped or disc-shaped cutting tool which is narrow at the end or circumference such that it supports the block piece held on the receiving device with the edge-processed lens blocked therefrom, starting from an edge surface of the block piece near the lens to machine without touching the lens or the receiving device.
- a predominantly radial groove can be formed in the block piece / block material , which acts as a separating point between the lens and the block piece during further blocking.
- the processing device of the edge processing device preferably has a tool spindle with a tool holder, wherein the cutting tool accommodated in the tool holder of the blocking device can be driven to rotate about a tool rotation axis by means of the tool spindle.
- a rotationally driven cutting tool of the blocking device has the advantage of a larger removal rate, so that the lens can be blocked off more quickly.
- the rotary-driven, cutting-off tool of the blocking device is a milling cutter or a disc-shaped cutting tool, such as a disc milling cutter, a (circular) saw blade or a cutting disc, which are readily available commercially.
- the blocking device may comprise a nozzle assembly with a nozzle for the delivery of a high pressure fluid jet, in particular a high pressure water jet, in a direction substantially transverse to the workpiece axis of rotation on an edge region between the lens and the block piece.
- the processing device of the edge processing device may comprise a tool spindle with a tool holder which is rotatably connected to a spindle shaft, wherein the nozzle assembly is receivable in the tool holder of the tool spindle or mounted laterally on the tool spindle, so that the nozzle assembly together with the tool spindle movable is.
- the movement axes and / or tool connection geometries of the edge processing device which are present anyway for edge processing can also be used for the pressure-fluid-supported blocking device.
- the fluid supply can be effected in a simple manner such that the nozzle assembly receivable in the tool holder of the tool spindle is either provided with a hose connection running transversely to the spindle shaft for connection to a hose fluid-connected to a pressure medium source or fluid-connected to the pressure medium source via the spindle shaft formed as a hollow shaft is.
- the procedural side that, in the case of a production of spectacle lenses, in which the above-described device for edging can be used, provided that it is not intended to block it by means of a pressure medium high-pressure jet following (a) providing a lens blank having a first surface, a second surface opposite the first surface, and an edge between the first surface and the second surface; (b) blocking the lens blank a block piece, wherein the first surface of the lens blank faces a block face of the block piece followed by an edge face of the block piece, (c) treating the blocked lens blank at the second face and / or the edge, the treating at least one machining the second one Surface for generating a geometry according to a recipe and / or processing the edge to create a rim geometry that allows insertion of the treated spectacle lens into a rack or a lens holder, and (d) blocking the treated spectacle lens from the block piece; the main step (d) of blocking the treated spectacle lens from the block piece comprises a piercing sub-step
- Such a piercing sub-step can be performed simply and easily, in particular in the edge-processing device with the already existing machine axes and a suitable tool, which compared to a high-pressure Abblockclar the treated spectacle lens is spared, ie there is no risk that the partially tempered optical outer surfaces are damaged in the edge region of the spectacle lens by possibly existing, with high velocity impinging particles in the high-pressure jet (no "sandblast effect").
- the treated spectacle lens initially remains at the teilzerspanten (rest) block piece, which in turn is held in the receiving device of the processing device.
- the (remainder) block piece When removing the treated spectacle lens from the processing device After the piercing substep, the (remainder) block piece also advantageously serves for the automated handling of the treated spectacle lens, ie it can be removed from the processing apparatus while engaging the (remaining) block piece, the latter covering the entire area of the treated surface Eyeglass lens protects. After removal from the processing device, the treated spectacle lens can be removed at the end of the Abblock Colours only by hand, by gently tipping and pulling, from the (rest) block piece. The risk of damage to the treated spectacle lens is also extremely low here.
- the puncture can be generated by means of a pin-shaped or disc-shaped, cutting tool, which dips into the block piece by cutting.
- the cutting tool can be moved radially relative to the block piece and possibly also axially such that it essentially follows a curvature of the first face of the treated spectacle lens. This makes it possible that after performing the piercing sub-step in the region of the recess only a very thin block material or adhesive layer remains, which can be removed very easily manually by peeling off the spectacle lens.
- the treated spectacle lens can be supported on the block piece over a first, larger support surface and after the puncture is created via a second, smaller support surface, wherein according to investigations by the inventor, an area ratio of first to second support surface between 1, Should be 5 and 100.
- an area ratio of first to second support surface between 1, Should be 5 and 100.
- the piercing substep may be followed by a final step of blocking in which the treated spectacle lens is pulled off the block piece with mechanical force, e.g. by an automatic charging system, but preferably can be applied by hand by hand.
- mechanical force e.g. by an automatic charging system, but preferably can be applied by hand by hand.
- the Fig. 1 to 7 show a device 10 for processing an edge E of a blank for a lens L, in particular a spectacle lens, in a rectangular Cartesian coordinate system, in which the letter x denotes the width direction, the letter y the length direction and the letter z the height direction of the edge processing device 10.
- the edge processing device 10 - also called “edger" in spectacle optics - generally comprises a holding device 12 for holding the lens blank blocked on a block piece S in a working space 14 of the edge processing device 10, a processing device 16 by means of which a tool W for processing the edge E can be driven, and a movement device 18 for generating a relative movement between the lens blank and the edge processing tool W during the processing of the edge E in the working space 14 of the edge processing device 10.
- this edge processing device 10 has a blocking device 20, by means of which the edge-processed lens L in the working space 14 of the edge processing device 10 can be blocked by the block piece S.
- Fig. 1 and 4 to 7 can be seen includes the movement means 18 in the illustrated embodiment, a workpiece-side part and a tool-side part, both of which are attached to a machine bed 22, which in turn is elevated on the bottom side by means of a machine frame, not shown.
- the machine bed 22, which is substantially L-shaped in cross-section, has a top side 24 on which the tool-side part of the movement device 18 is arranged, and a front side 26 to which the workpiece-side part of the movement device 18 is attached and which the work space 14 as the rear wall bounded at the back.
- the tool-side part of the movement device 18 generally has three carriages, which allow tool-side movement in the three mutually perpendicular directions x, y, z, namely an X-carriage 28 and a Y-carriage 30, which in the manner of a cross table arrangement the upper side 24 of the machine bed 22 are stacked on top of each other, and a Z-slide 32, which is arranged movably on a front side of the Y-slide 30 facing the working space 14.
- the workpiece-side part of the movement device 18 generally comprises a pivot drive unit 34 with a pivot drive 36 flanged on the front side 26 of the machine bed 22 for pivoting a substantially L-shaped pivot head 38 seen in a side view about a pivot axis B in the length direction y of the edge processing device 10, and a workpiece spindle 40, which is mounted on a protruding into the working space 14 end of the swivel head 38 and by means of a collet 42 as part of the receiving device 12 about a workpiece axis of rotation A is rotationally driven, which is perpendicular to the pivot axis B.
- the receiver 12 is adapted to rotate the lens L blocked on the block piece S about the workpiece rotation axis A.
- FIG. 1 and 4 Further details of the tool-side part of the movement device 18 are in particular the Fig. 1 and 4 refer to.
- the Fig. 1 and 4 Accordingly, on the upper side 24 of the machine bed 22 two in the width direction x of the edge processing device 10 extending and parallel to each other guide rails 44, 44 mounted ', which serve the axial guidance of the X-carriage 28, including the X-carriage 28 on its underside with two pairs of carriages 46, 46 'is fitted, of which one pair (carriage 46) engages with one guide rail 44 and the other pair (carriage 46') with the other guide rail 44 '.
- a servo motor 50 is provided, which is flanged to the top 24 of the machine bed 22 and a toothed belt drive 52 in a bearing blocks 54th , 54 'on the upper side 24 of the machine bed 22 mounted threaded spindle 56 drives, in turn, with a mounted on the underside of the X-carriage 28 threaded nut (not visible in the figures) engages.
- two guide rails 58, 58 'extending in the longitudinal direction y of the edge processing device 10 are mounted on the underside of the Y carriage 30 and serve for the axial guidance of the Y carriage 30, for which purpose on the upper side of the X carriage Schlitten 28 two pairs of carriages 60, 60 'are mounted, of which the one pair ( Fig. 4 : Guide carriage 60) with one guide rail 58 and the other pair ( Fig. 1 : Carriage 60 ') with the other guide rail 58' engages.
- a servo motor 62 is also provided, which is mounted in the X-carriage 28 and a further toothed belt drive 64 in bearing eyes 66 (in the Fig. 1 and 4 is only the rear bearing eye 66 can be seen) of the X-carriage 28 mounted, further threaded spindle 68th drives, in turn, with a mounted on the bottom of the Y-carriage 30 threaded nut 70 (see Fig. 4 ) intervenes.
- a laterally mounted on the Y-carriage 30 stop 72 cooperates with associated, provided on the X-carriage 28 stops 73, 74 to limit the path of the Y-carriage 30 in the direction of y the edge processing device 10.
- two guide rails 76, 76 ' extending in the height direction z of the edge processing device 10 are mounted, which serve for the axial guidance of the Z-carriage 32 on the front side of the Y-carriage 30, for which purpose the Y-carriage 30 has on its front guide carriages or shoes (not visible in the figures), which engage with the guide rails 76, 76 '.
- a servomotor 78 is again provided, which is flanged from below to the Y-carriage 30 and a third toothed belt drive 80 on the top of the Y-carriage 30 a rotatably mounted on the Y-carriage 30 threaded nut 82nd drives, in turn, with a rotatably mounted on the Z-slide 32, in the height direction z of the edge processing device 10 extending threaded spindle 84 engages. At the upper, free end of the threaded spindle 84, this is provided with a stop nut 86 for Wegbegrenzung for the Z-slide 32 down.
- the processing device 16 of the edging device 10 has a tool spindle 88 flanged on the front side of the Z-carriage 32, by means of which a tool holder, i. in the illustrated embodiment, a chuck 90 for receiving the edge processing tool W, which is non-rotatably connected to a spindle shaft 91 of the tool spindle 88, controlled in rotational speed about a tool axis of rotation C can be driven to rotate in the height direction z of the edge processing device 10.
- the individual, known per se edge processing tools W grinding tools, drills, Form cutter, etc.
- clamp holders 96 see Fig. 1 ), that under a suitable method of the tool spindle 88 in the linear axes X, Y and Z individually clamped on the chuck 90 and removed from the open tool magazine 92 and can be returned to the open tool magazine 92 back.
- edge processing device 10 With the extent described kinematic structure of the edge processing device 10 can be processed on the edge E, held on the block piece S in the collet 42 of the workpiece spindle 40 lens L and the respective, the chuck 90 of the tool spindle 88 stretched and possibly to the tool rotation axis C rotationally driven edge processing tool W CNC-technically in the five axes (A, B, X, Y, Z) are moved relative to each other that all the usual edge processing steps can be performed (see, for example, the above-discussed document EP 1 243 380 A2 ), which requires no further explanation for the expert.
- the workpiece holding unit 98 comprises a preferably pneumatically driven cylinder arrangement 100, by means of which a holding arm 102 running transversely to the cylinder arrangement 100 and the workpiece spindle 40 can be moved at least axially in a direction parallel to the workpiece rotation axis A (see the arrow in FIG Fig. 3 ) and possibly also about a workpiece axis of rotation A parallel pivot axis (not shown) is pivotable.
- a free-running at the free end of the support arm 102 about its central axis mounted vacuum cleaner 104 with the workpiece axis of rotation A is aligned (or aligned) and can also in the direction of the collet 42 of the workpiece spindle 40 or moved away from it become.
- it may be at the sucker 104 is a suction cup, as in the FIGS. 2 and 3 shown;
- a suction head which can optionally be evacuated via a vacuum connection from the outside, such as in the publication mentioned above DE 10 2009 048 590 A1 described.
- the nipple 104 of the workpiece holding unit 98 can be lowered by the cylinder assembly 100 onto the lens L held on the collet 42 of the workpiece spindle 40 such that the nipple 104 on the second optically effective surface cc of FIG Lens L comes to the plant and is sucked on this (see Fig. 2 ). If the lens L is now blocked by the block piece S in the edge processing device 10, then the sucker 104 can securely hold the blocked lens L over the block piece S or in the working space 14, as in FIG Fig. 3 shown.
- At least the cutting tool eg the end mill 106 or the nozzle D as a separating effective part of the blocking device 20 by means of the movement device 18 of the edge processing device 10 with respect to the edge surface of the held on the receiving device 12 block piece S or relative thereto can be positioned, by means of the above-described movement axes A, B, X, Y, Z, so that the blocking device 20 in the illustrated embodiments does not require their own axes of movement.
- the blocking device 20 in each case comprises a nozzle assembly 108, which has the nozzle D for discharging the high-pressure printing fluid jet in a direction substantially transverse to the workpiece axis of rotation A to an edge region between the lens L and the block piece S, these variants with regard to Arrangement of the nozzle assembly 108 and the supply of the pressure medium (eg water) differ.
- the nozzle assembly 108 is designed so that it can be received in the tool holder, ie the chuck 90, on the spindle shaft 91 of the tool spindle 88.
- the nozzle assembly 108 When not in use, ie in the normal edge processing operation of the edge processing device 10, the nozzle assembly 108 then - like the edge processing tools W - are stowed in the tool magazine 92. In the variant according to Fig. 7 however, the nozzle assembly 108 is mounted laterally on the tool spindle 88 so that the nozzle assembly 108 can be moved together with the tool spindle 88.
- hose connection 110 for the connection of a with a pressure medium source (in the Fig. 5 and 6 schematically indicated at P) fluid-connected hose 112 may be provided, the hose connection 110 would then actually sit slightly lower than in Fig. 5 represented, namely below the chuck 90 on the nozzle assembly 108. Shown in FIG Fig.
- the hose connection 110 is provided with a rotary feedthrough not shown in the region of the chuck 90, so that the nozzle assembly 108 can be supplied via the chuck 90 with the pressure medium.
- the spindle shaft 91 is formed as a hollow shaft, wherein the in Fig. 6 the upper end of the tool spindle 88, a rotary feedthrough 114 is provided, to which the fluidically connected to the pressure medium source P hose 112 is connected, so that the pressure medium from the pressure medium source P via the hose 112, the rotary feedthrough 114 and the hollow spindle shaft 91 to the nozzle D of the Chuck 90 held nozzle assembly 108 can pass.
- the stowage of the nozzle assembly 108 in the tool magazine 92 is simpler, because the tube 112 is not firmly connected to the nozzle assembly 108 and also does not extend in the region of the chuck 90.
- a suitable, preferably automatically actuated shut-off device is provided at the pressure medium source P or the hose 112, which for simplifying the representation in the Fig. 5 and 6 however not shown.
- the nozzle D of the blocking device 20 and held over the block piece S on the receiving device 12 lens L by means of the axes of movement (A, B, X, Y, Z) of the moving means 18 CNC technically so relative to each other in Working space 14 of the edge processing device 10 can be positioned so that the high pressure jet discharged from the nozzle D impinges at a predetermined location on the edge region between the lens L and block piece S to block off the lens L held by the nipple 104 of the workpiece holding unit 98 from the block piece S.
- How such a positioning can be done in detail is in the above-mentioned document DE 10 2009 048 590 A1 under Reference to their Fig. 5 explained in detail, which is hereby expressly referenced to avoid repetition.
- the blocking of the lens L from the block piece S with the aid of a cutting tool in a special embodiment of the method will be explained below with reference to FIGS Fig. 8 to 16 be explained.
- the above-described edge processing device 10 can be used.
- FIG. 8 a flowchart of a method for producing spectacle lenses L from a semi-finished product, which is usually already finished on its first optically active surface cx and provided with an AR, ie anti-reflection layer and a protective layer.
- This process generally comprises the following four main steps (a) to (d) taking place in the order indicated (see also the references in US Pat Fig.
- the main step (d) of blocking the treated spectacle lens L of the block piece S comprises a first step, namely a piercing substep (d.1), starting from the edge surface R of the block piece S adjacent to or near the first surface cx has a groove N (see Figs Fig. 12 and 16 ) is generated, which serves during further blocking (d.2) as a predetermined separation point between the spectacle lens L and block piece S.
- the main step (c) of treating the blocked lens blank may comprise the following sub-steps in a manner known per se: (c.1) generating, that is to say, in the case of plastic lens blanks, generally milling and turning to produce the desired macrogeometry as prescripted on the second surface cc of the lens blank and then polishing to obtain the desired microgeometry on the second surface cc of the lens blank; (c.2) cleaning the blocked surface of the lens blank finished on the second surface cc; (c.3) coating on the second surface cc of the blocked lens blank, namely spin coating or dip coating, to form, in particular, a hard layer and sub-coating steps under vacuum to produce the desired AR and protective layers; and (c.4) machining the edge E of the blocked lens blank for fitting in an associated spectacle frame.
- a side milling cutter 116 (FIG. Fig. 13 to 16 ) or saw blade, which can be mounted on one end of a edge processing tool W, more precisely its shaft.
- the respective tool 106 or 116 is clamped in the chuck 90 of the tool spindle 88 and then driven in rotation about the tool rotation axis C by means of the tool spindle 88 in order to produce the relative speed between tool and workpiece required for machining.
- the respective tool is frontally (end mill 106) and peripherally (disc cutter 116) formed so narrow that it held on the receiving device 12 block piece S with it, edge-processed lens L starting from the edge surface R of the block piece S near the lens L. is able to machine, ie by cutting into the block piece S, without touching the lens L or the receiving device 12 (cf. Fig. 12 and 16 ).
- block piece S and lens L are also rotationally driven about the workpiece rotation axis A to circumferentially produce the groove N on the block piece S.
- such a movement of the respective tool 106 or 116 relative to the block piece S takes place here, so that it substantially follows a curvature of the first surface cx of the treated spectacle lens L.
- This is in the process variant according to the Fig. 9 to 12 achieved by a coordinated movement in the axes B, X and Z, in the process variant according to the Fig. 13 to 16 however, by a coordinated movement in the axes X and Z.
- FIGS. 9 and 12 on the one hand and the Fig. 14 and 16 On the other hand, it can be further seen that the treated spectacle lens L before blocking (d) via a first, larger support surface Q 1 and after generating the recess N on a second, smaller support surface Q 2 on the block piece S, more precisely, the block area F (as far as remaining) is supported, wherein an area ratio of first to second support surface Q 1 / Q 2 - depending on the circumferential contour of the lens L - can be between 1.5 and 100.
- the area ratio Q 1 / Q 2 in the circular peripheral contour of the lens L is according to FIGS Fig. 9 to 12 about 3.2 and in the oval peripheral contour of the lens L according to Fig. 13 to 16 about 1.5.
- a last step (d.2) of blocking (d) (cf. Fig. 8 ), in which the treated spectacle lens L is pulled off the block piece S with mechanical force, wherein the recess N defines the predetermined separation point between the lens L and the block piece S.
- the removal of the lens L from the block piece S can either be done by hand or with a possibly provided charging system or - with a suitable design - with the in the FIGS. 2 and 3 If the block material M or a remainder of it still remains on the first surface cx of the lens L, it is finally to be removed from the lens L by hand.
- An apparatus for processing an edge of a blank for a lens comprises a receiving device for holding the lens blank blocked on a block piece in a working space of the edge processing device, a processing device by means of which a tool for machining the edge can be driven, and a movement device for generating a relative movement between the lens blank and the tool during the processing of the edge in the working space.
- the edge processing device has a blocking device, by means of which the lens in the working space from the block piece can be blocked off.
- the Abblock main step comprises a piercing sub-step in which, starting from the edge surface of the block piece adjacent to or near a first surface of the lens, a puncture is generated, the further blocking as a predetermined separation point between the spectacle lens and block piece serves.
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Abstract
Eine Vorrichtung (10) zur Bearbeitung eines Rands (E) eines Rohlings für eine Linse (L), insbesondere Brillenlinse, umfasst eine Aufnahmeeinrichtung (12) zum Halten des auf einem Blockstück (S) geblockten Linsenrohlings in einem Arbeitsraum (14) der Randbearbeitungsvorrichtung, eine Bearbeitungseinrichtung (16), mittels der ein Werkzeug (W) für die Bearbeitung des Rands antreibbar ist, und eine Bewegungseinrichtung (18) zum Erzeugen einer Relativbewegung zwischen Linsenrohling und Werkzeug während der Bearbeitung des Rands in dem Arbeitsraum. Zur Vereinfachung und Verbesserung des Handlings im Zusammenhang mit dem Abblocken der behandelten, insbesondere am Rand bearbeiteten Linse weist die Randbearbeitungsvorrichtung eine Abblockeinrichtung (20) auf, mittels der die Linse im Arbeitsraum vom Blockstück abblockbar ist. Außerdem wird ein Herstellverfahren für Brillenlinsen vorgeschlagen, dessen Abblock-Hauptschritt einen Einstech-Unterschritt umfasst, bei dem ausgehend von der Randfläche des Blockstücks angrenzend an oder nahe einer ersten Fläche der Linse ein Einstich erzeugt wird, der beim weiteren Abblocken als Solltrennstelle zwischen Brillenlinse und Blockstück dient.A device (10) for processing an edge (E) of a blank for a lens (L), in particular spectacle lens, comprises a receiving device (12) for holding the lens blank blocked on a block piece (S) in a working space (14) of the edge processing device, a machining device (16) by means of which a tool (W) for the machining of the edge can be driven, and a movement device (18) for producing a relative movement between the lens blank and the tool during the machining of the edge in the working space. To simplify and improve handling in connection with the blocking of the treated, in particular edge-processed lens, the edge processing device has a blocking device (20) by means of which the lens in the working space can be blocked off from the block piece. In addition, a manufacturing method for spectacle lenses is proposed, the Abblock main step comprises a piercing sub-step in which, starting from the edge surface of the block piece adjacent to or near a first surface of the lens, a puncture is generated, the further blocking as a predetermined separation point between the spectacle lens and block piece serves.
Description
Die vorliegende Erfindung bezieht sich allgemein auf eine Vorrichtung zur Bearbeitung eines Rands eines Rohlings für eine Linse gemäß dem Oberbegriff des Patentanspruchs 1. Insbesondere bezieht sich die Erfindung auf eine Vorrichtung zur Randbearbeitung von Brillenlinsen, wie sie heutzutage auch in sogenannten "RX-Werkstätten", d.h. Produktionsstätten zur Fertigung von individuellen Brillenlinsen nach Rezept in einem industriellen Maßstab zum Einsatz kommt. Die vorliegende Erfindung bezieht sich ferner auf ein Verfahren zur Herstellung von Brillenlinsen gemäß dem Oberbegriff des Patentanspruchs 10.The present invention relates generally to a device for processing an edge of a blank for a lens according to the preamble of
In solchen "RX-Werkstätten" wird die jeweilige "aufgeblockte" Brillenlinse bekanntermaßen an ihrer Rück- oder Frontfläche im Hinblick auf ihre optische Wirkung (insbesondere nach Rezept) und/oder am Rand zur Einpassung in ein zugeordnetes Brillengestell mit geometrisch bestimmter Schneide (Fräsen/Drehen) und/oder geometrisch unbestimmten Schneiden (Schleifen/Polieren) spanend bearbeitet und/oder auf ihrer Rück- bzw. Frontfläche zur Erzielung zusätzlicher Wirkungen (Erhöhung der Kratzfestigkeit, Antireflexionseigenschaften, Verspiegelung, hydrophobe Eigenschaften, etc.) beschichtet.In such "RX workshops" the respective "blocked" spectacle lens is known to be on its rear or front surface in terms of their optical effect (especially by prescription) and / or at the edge for fitting in an associated spectacle frame with geometrically defined cutting edge (milling / Turning) and / or geometrically indeterminate cutting (grinding / polishing) machined and / or coated on its back or front surface to achieve additional effects (increase in scratch resistance, anti-reflection properties, mirroring, hydrophobic properties, etc.).
Dabei wird als "Aufblocken" oder kurz "Blocken" in der Optikfertigung allgemein der Vorgang bezeichnet, bei dem ein optisches Werkstück mittels eines geeigneten Materials (niedrig schmelzende Legierung - sogenanntes "Alloy" - oder Klebstoff) auf einem sogenannten "Blockstück" temporär befestigt wird, oder aber das Blockmaterial auf dem Werkstück aufgebracht wird, um selbst das Blockstück auszubilden, welches dann dazu dient, das Werkstück in der jeweiligen Bearbeitungsmaschine und/oder Beschichtungsanlage zu halten. Dementsprechend heißt in der Optikfertigung derjenige Vorgang "Abblocken", bei dem das optische Werkstück nach dessen (End)Bearbeitung (an Fläche und/oder Rand) und/oder Beschichtung wieder vom Blockstück/Blockmaterial getrennt wird.In this context, the term "blocking" or "blocking" in optical production generally refers to the process in which an optical workpiece is temporarily fixed on a so-called "block piece" by means of a suitable material (low-melting alloy - so-called "alloy" or adhesive) or the block material is applied to the workpiece to form itself the block piece, which then serves to hold the workpiece in the respective processing machine and / or coating system. Accordingly, in optics production, that process is called "blocking off", in which the optical workpiece is separated from the block piece / block material after its (end) processing (on surface and / or edge) and / or coating.
Wenn nachfolgend im Zusammenhang mit der vorliegenden Erfindung als bevorzugtem Anwendungsgebiet allgemein von "Brillenlinsen" die Rede ist, sind darunter optische Linsen bzw. Linsenrohlinge (Blanks) für Brillen aus den gebräuchlichen Materialien, wie Polycarbonat, Mineralglas, CR 39, HI-Index, etc. und mit beliebiger (Vor)Form des Umfangsrands der Linse bzw. des Linsenrohlings zu verstehen, die vor dem Blocken bereits an einer oder beiden optisch wirksamen Fläche(n) und/oder am Rand (vor)bearbeitet und/oder (vor)beschichtet sein können aber nicht müssen. Auch kann die Brillenlinse auf ihrer Fläche, an der sie geblockt wird, mit einer Folie, einem Lack od.dgl. versehen sein, um diese Fläche vor Verunreinigung und Beschädigung zu schützen und/oder die Haftungseigenschaften zwischen Brillenlinse und Blockmaterial zu verbessern, ohne dass dies im Folgenden jeweils eigens erwähnt wird.If, in the context of the present invention, the preferred field of application is generally referred to as "spectacle lenses" below are optical lenses or blanks for spectacles made of conventional materials such as polycarbonate, mineral glass, CR 39, HI index, etc and with any (pre) shape of the peripheral edge of the lens or of the lens blank, which already processes (pre) and / or (pre-) before blocking on one or both optically active surface (s) and / or edge but you do not have to be. Also, the spectacle lens on its surface on which it is blocked, with a film, a paint or the like. be provided to protect this surface from contamination and damage and / or to improve the adhesion properties between the spectacle lens and the block material, without being specifically mentioned in the following.
In der den Oberbegriff des Patentanspruchs 10 bildenden Druckschrift
Für die eigentliche Randbearbeitung kann hierbei grundsätzlich eine Randbearbeitungsvorrichtung - in dieser Branche auch "Edger" genannt - zum Einsatz kommen, wie sie aus der den Oberbegriff des Patentanspruchs 1 bildenden Druckschrift
Nach der Randbearbeitung ist die geblockte, fertiggerandete Brillenlinse aus der Randbearbeitungsvorrichtung zu entnehmen, worauf die Brillenlinse vom Blockstück noch abzublocken ist. Hierfür bedient man sich im Stand der Technik insbesondere auch Abblockvorrichtungen mit einer um eine Werkstück-Drehachse drehbaren Aufnahme für die geblockte Brillenlinse, bei denen nach Einsetzen der geblockten Brillenlinse in die Aufnahme über eine Düse ein Druckmittel-Hochdruckstrahl in einer Richtung im Wesentlichen quer zur Werkstück-Drehachse auf einen Randbereich zwischen der Brillenlinse und dem Blockstück abgegeben wird, um die Brillenlinse vom Blockstück zu trennen. Derartige Abblockvorrichtungen werden z.B. in den Druckschriften
Ein alternatives Vorgehen beim Abblocken wird schließlich in der Druckschrift
Derartige Abblockverfahren sind indes relativ aufwendig; außerdem besteht beim Handling des Blockstück-Linsenpaars vor dem Abblocken die Gefahr einer Beschädigung der fertig bearbeiteten Brillenlinse auf dem Blockstück.However, such blocking methods are relatively expensive; In addition, when handling the block-piece lens pair before blocking, there is a risk of damaging the finished-processed spectacle lens on the block piece.
Der Erfindung liegt die Aufgabe zugrunde, den vorbeschriebenen Stand der Technik vorrichtungs- und verfahrensseitig derart weiterzubilden, dass das Handling im Zusammenhang mit dem Abblocken der behandelten, insbesondere am Rand bearbeiteten Linse vom Blockstück vereinfacht und verbessert wird, bei gleichzeitiger Minimierung der Gefahr einer Linsenbeschädigung.The invention has the object of developing the above-described prior art device and process side so that the handling in connection with the blocking of the treated, in particular the edge processed lens is simplified and improved by the block piece, while minimizing the risk of lens damage.
Diese Aufgabe wird durch die im Patentanspruch 1 bzw. 10 angegebenen Merkmale gelöst. Vorteilhafte oder zweckmäßige Weiterbildungen der Erfindung sind Gegenstand der Patentansprüche 2 bis 9 und 11 bis 14.This object is achieved by the features specified in
Vorrichtungsseitig ist gemäß der Erfindung vorgesehen, dass eine Vorrichtung zur Bearbeitung eines Rands eines Rohlings für eine Linse, insbesondere eine Brillenlinse, umfassend eine Aufnahmeeinrichtung zum Halten des auf einem Blockstück geblockten Linsenrohlings in einem Arbeitsraum der Randbearbeitungsvorrichtung, eine Bearbeitungseinrichtung, mittels der ein Werkzeug für die Bearbeitung des Rands antreibbar ist, und eine Bewegungseinrichtung zum Erzeugen einer Relativbewegung zwischen dem Linsenrohling und dem Werkzeug während der Bearbeitung des Rands in dem Arbeitsraum der Randbearbeitungsvorrichtung, auch eine Abblockeinrichtung aufweist, mittels der die randbearbeitete Linse im Arbeitsraum der Randbearbeitungsvorrichtung vom Blockstück abblockbar ist.On the device side is provided according to the invention, that an apparatus for processing an edge of a blank for a lens, in particular a spectacle lens, comprising a receiving device for holding the blocked on a block piece lens blank in a working space of the edge processing device, a processing device by means of a tool for the Machining of the edge is drivable, and a moving means for generating a relative movement between the lens blank and the tool during the processing of the edge in the working space of the edge processing device, also comprises a blocking device by means of which the edge-processed lens in the working space of the edge processing device from the block piece can be blocked off.
Infolge des Kerngedankens der Erfindung, das Abblocken in derselben Vorrichtung durchzuführen, in der auch die Randbearbeitung erfolgt, nämlich im Edger, entfallen in vorteilhafter Weise die im oben geschilderten Stand der Technik zwingend vorhandenen Schritte des Handlings des Blockstück-Linsenpaars zwischen der Randbearbeitungsvorrichtung und der Abblockvorrichtung. Dies führt nicht nur zu einer erheblichen Verkürzung der Gesamtprozesszeit, sondern verringert insbesondere gegenüber dem vorbeschriebenen Vorgehen mit Längsschlitzen des Blockstücks auch deutlich das Risiko einer Beschädigung der randbearbeiteten Linse. Darüber hinaus wird eine separate Abblockvorrichtung gänzlich eingespart; die ohnehin vorhandenen Bewegungsachsen des Edgers wie auch dessen gekapselter Arbeitsraum können auch zum Abblocken verwendet werden, was zum einen den hierfür zu betreibenden Aufwand gering hält und zum anderen Bauraumvorteile hat, weil ein gesonderter Maschinenstellplatz zum Abblocken nicht notwendig ist.As a result of the core idea of the invention to perform the blocking in the same device, in which also the edge processing takes place, namely in Edger, eliminates the mandatory in the above-described prior art in an advantageous manner Steps of handling the block-piece lens pair between the edge processing device and the blocking device. This not only leads to a considerable reduction in the overall process time, but also significantly reduces the risk of damage to the edge-processed lens, in particular in comparison to the above-described procedure with longitudinal slots of the block piece. In addition, a separate blocking device is completely saved; the already existing movement axes of the edger as well as its encapsulated working space can also be used for blocking, which on the one hand keeps the effort to be operated low and on the other space advantages, because a separate machine storage space for blocking is not necessary.
Grundsätzlich ist es zwar denkbar, einen eigenen geeigneten Bewegungsmechanismus für die Abblockeinrichtung der Randbearbeitungsvorrichtung vorzusehen. Im Hinblick auf einen vorrichtungstechnisch besonders geringen Aufwand ist es jedoch bevorzugt, wenn wenigstens ein trennwirksamer Teil der Abblockeinrichtung mittels der Bewegungseinrichtung der Randbearbeitungsvorrichtung bezüglich einer Randfläche des an der Aufnahmeeinrichtung gehaltenen Blockstücks positionierbar ist, so dass nicht nur der Arbeitsraum, sondern auch die Bewegungsachsen des Edgers für die Randbearbeitung und das Abblocken "geteilt" bzw. "doppelt" verwendet werden.In principle, it is conceivable to provide its own suitable movement mechanism for the blocking device of the edge processing device. With regard to a device technology particularly low effort, however, it is preferred if at least one separating effective part of the blocking device is positionable by means of the movement device of the edge processing device with respect to an edge surface of the held on the receiving block piece, so that not only the working space, but also the axes of movement of the edger used for edging and blocking "split" or "double".
Wenngleich es prinzipiell möglich ist, die Ausgestaltung derart zu treffen, dass der auf dem Blockstück geblockte Linsenrohling im Arbeitsraum stationär gehalten ist, während das Werkzeug der Bearbeitungseinrichtung oder ein trennwirksamer Teil der Abblockeinrichtung mittels der Bewegungseinrichtung bei der Randbearbeitung bzw. dem Abblocken um den Linsenrohling herum bewegt wird, ist die Anordnung vorzugsweise so getroffen, dass die Aufnahmeeinrichtung dazu angepasst ist, den auf dem Blockstück geblockten Linsenrohling um eine Werkstück-Drehachse zu drehen. Hierdurch werden insbesondere kürzere Verfahrwege der Bewegungseinrichtung und damit auch eine kostengünstigere und kompaktere Ausgestaltung der Randbearbeitungsvorrichtung ermöglicht.Although it is in principle possible to make the design such that the lens block blocked on the block piece is held stationary in the working space, while the tool of the processing device or a separating effective part of the blocking device by means of the moving device in the edge processing or blocking around the lens blank is moved, the arrangement is preferably made such that the receiving device is adapted to the blocked on the block piece lens blank around a workpiece axis of rotation to rotate. As a result, in particular shorter travel paths of the movement device and thus also a more cost-effective and more compact design of the edge processing device are made possible.
In einer ersten Variante kann die Abblockeinrichtung ein stift- oder scheibenförmiges, spanabhebendes Werkzeug umfassen, das stirn- oder umfangsseitig derart schmal ausgebildet ist, dass es das an der Aufnahmeeinrichtung gehaltene Blockstück mit daran geblockter, randbearbeiteter Linse ausgehend von einer Randfläche des Blockstücks nahe der Linse zu zerspanen vermag, ohne die Linse oder die Aufnahmeeinrichtung zu berühren. Somit lässt sich auf einfache Weise während des Abblockens der gerandeten bzw. behandelten Linse von dem Blockstück in einem Einstech-Unterschritt ausgehend von der Randfläche des Blockstücks angrenzend an oder nahe der dem Blockstück zugewandten Fläche der Linse ein vornehmlich radial verlaufender Einstich im Blockstück/Blockmaterial erzeugen, der beim weiteren Abblocken als Solltrennstelle zwischen Linse und Blockstück fungiert.In a first variant, the blocking device may comprise a pencil-shaped or disc-shaped cutting tool which is narrow at the end or circumference such that it supports the block piece held on the receiving device with the edge-processed lens blocked therefrom, starting from an edge surface of the block piece near the lens to machine without touching the lens or the receiving device. Thus, in a simple manner, during blocking of the treated lens from the block piece, in a piercing sub-step, starting from the edge face of the block piece adjacent to or near the block piece facing surface of the lens, a predominantly radial groove can be formed in the block piece / block material , which acts as a separating point between the lens and the block piece during further blocking.
Hierbei weist die Bearbeitungseinrichtung der Randbearbeitungsvorrichtung vorzugsweise eine Werkzeugspindel mit einer Werkzeugaufnahme auf, wobei das in der Werkzeugaufnahme aufgenommene spanabhebende Werkzeug der Abblockeinrichtung mittels der Werkzeugspindel um eine Werkzeug-Drehachse drehend antreibbar ist. Gegenüber einer ebenfalls denkbaren Ausgestaltung der Abblockeinrichtung mit einem relativ zum drehenden Blockstück nur zustellbaren Drehmeißel hat ein drehangetriebenes spanabhebendes Werkzeug der Abblockeinrichtung insbesondere den Vorteil eines größeren Zeitspanvolumens, so dass die Linse schneller abgeblockt werden kann. Bevorzugt handelt es sich bei dem drehangetriebenen, spanabhebenden Werkzeug der Abblockeinrichtung um einen Fingerfräser oder ein scheibenförmiges Schneidwerkzeug, wie einen Scheibenfräser, ein (Kreis)Sägeblatt oder eine Trennscheibe, die problemlos im Handel erhältlich sind.In this case, the processing device of the edge processing device preferably has a tool spindle with a tool holder, wherein the cutting tool accommodated in the tool holder of the blocking device can be driven to rotate about a tool rotation axis by means of the tool spindle. In contrast to a likewise conceivable embodiment of the blocking device with a turning tool that can only be delivered relative to the rotating block piece, a rotationally driven cutting tool of the blocking device has the advantage of a larger removal rate, so that the lens can be blocked off more quickly. Preferably, the rotary-driven, cutting-off tool of the blocking device is a milling cutter or a disc-shaped cutting tool, such as a disc milling cutter, a (circular) saw blade or a cutting disc, which are readily available commercially.
In einer zweiten Variante kann die Abblockeinrichtung eine Düsenbaugruppe mit einer Düse für die Abgabe eines Druckmittel-Hochdruckstrahls, insbesondere eines Hochdruck-Wasserstrahls, in einer Richtung im Wesentlichen quer zur Werkstück-Drehachse auf einen Randbereich zwischen Linse und Blockstück umfassen. Ein Vorteil dieser Variante ist u.a. darin zu sehen, dass das Blockstück - sofern es nicht bereits während des Randbearbeitungsvorgangs in der Randbearbeitungsvorrichtung mit zerspant bzw. abgearbeitet wurde - wieder verwendet werden kann.In a second variant, the blocking device may comprise a nozzle assembly with a nozzle for the delivery of a high pressure fluid jet, in particular a high pressure water jet, in a direction substantially transverse to the workpiece axis of rotation on an edge region between the lens and the block piece. An advantage of this variant is u.a. to be seen in that the block piece - unless it was already machined or processed during the edge processing operation in the edge processing device - can be used again.
Bei dieser Variante kann die Bearbeitungseinrichtung der Randbearbeitungsvorrichtung eine Werkzeugspindel mit einer Werkzeugaufnahme aufweisen, die mit einer Spindelwelle drehfest verbunden ist, wobei die Düsenbaugruppe in der Werkzeugaufnahme der Werkzeugspindel aufnehmbar ausgebildet oder seitlich an der Werkzeugspindel angebracht ist, so dass die Düsenbaugruppe zusammen mit der Werkzeugspindel bewegbar ist. Vorteilhaft lassen sich hier also wiederum die für die Randbearbeitung ohnehin vorhandenen Bewegungsachsen und/oder Werkzeuganschlussgeometrien der Randbearbeitungsvorrichtung auch für die druckfluidgestützte Abblockeinrichtung verwenden. Die Fluidzufuhr kann hierbei auf einfache Weise so erfolgen, dass die in der Werkzeugaufnahme der Werkzeugspindel aufnehmbar ausgebildete Düsenbaugruppe entweder mit einem quer zur Spindelwelle verlaufenden Schlauchanschluss für den Anschluss eines mit einer Druckmittelquelle fluidverbundenen Schlauchs versehen ist oder über die als Hohlwelle ausgebildete Spindelwelle mit der Druckmittelquelle fluidverbunden ist.In this variant, the processing device of the edge processing device may comprise a tool spindle with a tool holder which is rotatably connected to a spindle shaft, wherein the nozzle assembly is receivable in the tool holder of the tool spindle or mounted laterally on the tool spindle, so that the nozzle assembly together with the tool spindle movable is. Advantageously, in this case, the movement axes and / or tool connection geometries of the edge processing device which are present anyway for edge processing can also be used for the pressure-fluid-supported blocking device. In this case, the fluid supply can be effected in a simple manner such that the nozzle assembly receivable in the tool holder of the tool spindle is either provided with a hose connection running transversely to the spindle shaft for connection to a hose fluid-connected to a pressure medium source or fluid-connected to the pressure medium source via the spindle shaft formed as a hollow shaft is.
Des Weiteren ist erfindungsgemäß verfahrensseitig vorgesehen, dass bei einer Herstellung von Brillenlinsen, bei der insbesondere die vorbeschriebene Vorrichtung zur Randbearbeitung - soweit in dieser nicht vermittels eines Druckmittel-Hochdruckstrahls abgeblockt werden soll - Verwendung finden kann und die folgenden Verfahrenshauptschritte in der angegebenen Reihenfolge durchlaufen werden: (a) Bereitstellen eines Linsenrohlings, der eine erste Fläche, eine bezüglich der ersten Fläche entgegengesetzte, zweite Fläche und einen Rand zwischen der ersten Fläche und der zweiten Fläche aufweist, (b) Blocken des Linsenrohlings auf ein Blockstück, wobei die erste Fläche des Linsenrohlings einer Blockfläche des Blockstücks zugewandt ist, an die sich eine Randfläche des Blockstücks anschließt, (c) Behandeln des geblockten Linsenrohlings an der zweiten Fläche und/oder dem Rand, wobei das Behandeln wenigstens ein Bearbeiten der zweiten Fläche zur Erzeugung einer Geometrie gemäß einem Rezept und/oder ein Bearbeiten des Rands zur Erzeugung einer Randgeometrie umfasst, die ein Einsetzen der behandelten Brillenlinse in ein Gestell oder eine Linsenhalterung gestattet, und (d) Abblocken der behandelten Brillenlinse von dem Blockstück; der Hauptschritt (d) des Abblockens der behandelten Brillenlinse von dem Blockstück einen Einstech-Unterschritt (d.1) umfasst, bei dem ausgehend von der Randfläche des Blockstücks angrenzend an oder nahe der ersten Fläche ein Einstich erzeugt wird, der beim weiteren Abblocken als Solltrennstelle zwischen Brillenlinse und Blockstück dient.Furthermore, according to the invention, it is provided on the procedural side that, in the case of a production of spectacle lenses, in which the above-described device for edging can be used, provided that it is not intended to block it by means of a pressure medium high-pressure jet following (a) providing a lens blank having a first surface, a second surface opposite the first surface, and an edge between the first surface and the second surface; (b) blocking the lens blank a block piece, wherein the first surface of the lens blank faces a block face of the block piece followed by an edge face of the block piece, (c) treating the blocked lens blank at the second face and / or the edge, the treating at least one machining the second one Surface for generating a geometry according to a recipe and / or processing the edge to create a rim geometry that allows insertion of the treated spectacle lens into a rack or a lens holder, and (d) blocking the treated spectacle lens from the block piece; the main step (d) of blocking the treated spectacle lens from the block piece comprises a piercing sub-step (d.1) in which, starting from the edge face of the block piece adjacent to or near the first face, a puncture is created which, when further blocked, acts as a predetermined break point between eyeglass lens and block piece is used.
Ein solcher Einstech-Unterschritt lässt sich insbesondere in der Randbearbeitungsvorrichtung mit den ohnehin vorhandenen Maschinenachsen und einem geeigneten Werkzeug einfach und problemlos ausführen, wobei im Vergleich zu einem Hochdruck-Abblockverfahren die behandelte Brillenlinse geschont wird, d.h. es besteht keine Gefahr, dass die zum Teil vergüteten optischen Außenflächen im Randbereich der Brillenlinse durch ggf. vorhandene, mit hoher Geschwindigkeit auftreffende Partikel im Hochdruckstrahl beschädigt werden (kein "Sandstrahleffekt"). Dabei verbleibt die behandelte Brillenlinse zunächst am teilzerspanten (Rest)Blockstück, welches seinerseits in der Aufnahmeeinrichtung der Bearbeitungsvorrichtung gehalten ist. Beim Entnehmen der behandelten Brillenlinse aus der Bearbeitungsvorrichtung nach dem Einstech-Unterschritt dient das (Rest)Blockstück weiterhin vorteilhaft dem ggf. auch automatisierten Handling der behandelten Brillenlinse, d.h. diese kann aus der Bearbeitungsvorrichtung unter Angreifen am (Rest)Blockstück entnommen werden, wobei Letzteres über seine volle Fläche die erste Fläche der behandelten Brillenlinse schützt. Nach Entnahme aus der Bearbeitungsvorrichtung kann die behandelte Brillenlinse am Ende des Abblockschritts lediglich von Hand, durch leichtes Abkippen und Ziehen, vom (Rest)Blockstück abgezogen werden. Die Gefahr einer Beschädigung der behandelten Brillenlinse ist auch hierbei äußerst gering.Such a piercing sub-step can be performed simply and easily, in particular in the edge-processing device with the already existing machine axes and a suitable tool, which compared to a high-pressure Abblockverfahren the treated spectacle lens is spared, ie there is no risk that the partially tempered optical outer surfaces are damaged in the edge region of the spectacle lens by possibly existing, with high velocity impinging particles in the high-pressure jet (no "sandblast effect"). In this case, the treated spectacle lens initially remains at the teilzerspanten (rest) block piece, which in turn is held in the receiving device of the processing device. When removing the treated spectacle lens from the processing device After the piercing substep, the (remainder) block piece also advantageously serves for the automated handling of the treated spectacle lens, ie it can be removed from the processing apparatus while engaging the (remaining) block piece, the latter covering the entire area of the treated surface Eyeglass lens protects. After removal from the processing device, the treated spectacle lens can be removed at the end of the Abblockschritts only by hand, by gently tipping and pulling, from the (rest) block piece. The risk of damage to the treated spectacle lens is also extremely low here.
In zweckmäßiger Weise kann der Einstich mittels eines stift- oder scheibenförmigen, spanabhebenden Werkzeugs erzeugt werden, welches in das Blockstück spanend eintaucht. Das spanabhebende Werkzeug kann bei Erzeugung des Einstichs relativ zum Blockstück radial und ggf. auch derart axial bewegt werden, dass es einer Krümmung der ersten Fläche der behandelten Brillenlinse im Wesentlichen folgt. Hierdurch ist es möglich, dass nach Durchführung des Einstech-Unterschritts im Bereich des Einstichs nur eine sehr dünne Blockmaterial- bzw. Klebstoffschicht verbleibt, die sich besonders leicht manuell durch Abziehen von der Brillenlinse entfernen lässt.Conveniently, the puncture can be generated by means of a pin-shaped or disc-shaped, cutting tool, which dips into the block piece by cutting. When the puncture is created, the cutting tool can be moved radially relative to the block piece and possibly also axially such that it essentially follows a curvature of the first face of the treated spectacle lens. This makes it possible that after performing the piercing sub-step in the region of the recess only a very thin block material or adhesive layer remains, which can be removed very easily manually by peeling off the spectacle lens.
Im weiteren Verfolg des Erfindungsgedankens kann sich die behandelte Brillenlinse vor dem Abblocken über eine erste, größere Abstützfläche und nach Erzeugung des Einstichs über eine zweite, kleinere Abstützfläche auf dem Blockstück abstützen, wobei nach Untersuchungen des Erfinders ein Flächenverhältnis von erster zu zweiter Abstützfläche zwischen 1,5 und 100 betragen sollte. Hierbei stehen eher größere Flächenverhältnisse für große, kreisrunde Brillenlinsen (bis zu maximal 85 mm Durchmesser), während eher kleinere Flächenverhältnisse für kleine, elliptisch gerandete Brillenlinsen stehen (mit Hauptachsenmaßen bis minimal 15 mm und 30 mm). Diese Flächenverhältnisse lassen erwarten, dass die behandelte Brillenlinse bezüglich des teilzerspanten (Rest)Blockstücks geringfügig abgekippt und damit hiervon leicht gelöst werden kann, d.h. ohne dass für das mechanische, endgültige Trennen von Brillenlinse und (Rest)Blockstück ein großer Kraftaufwand benötigt würde.In the further pursuit of the inventive concept, the treated spectacle lens can be supported on the block piece over a first, larger support surface and after the puncture is created via a second, smaller support surface, wherein according to investigations by the inventor, an area ratio of first to second support surface between 1, Should be 5 and 100. Here are rather larger area ratios for large, circular eyeglass lenses (up to a maximum of 85 mm in diameter), while rather smaller area ratios for small, elliptically filed eyeglass lenses are (with major axis dimensions to a minimum of 15 mm and 30 mm). Leave these area ratios expect that the treated spectacle lens with respect to the teilzerspanten (remainder) block piece can be slightly tilted and thus easily solved, ie without the mechanical, final separation of spectacle lens and (rest) block piece a great effort would be required.
Schließlich kann sich an den Einstech-Unterschritt ein letzter Schritt des Abblockens anschließen, bei dem die behandelte Brillenlinse mit mechanischer Kraft von dem Blockstück abgezogen wird, die z.B. durch ein automatisches Ladesystem, vorzugsweise aber gefühlvoll von Hand aufgebracht werden kann.Finally, the piercing substep may be followed by a final step of blocking in which the treated spectacle lens is pulled off the block piece with mechanical force, e.g. by an automatic charging system, but preferably can be applied by hand by hand.
Im Folgenden wird die Erfindung anhand bevorzugter Ausführungsbeispiele unter Bezugnahme auf die beigefügten, teilweise schematischen Zeichnungen näher erläutert, in denen gleiche Bezugszeichen gleiche bzw. entsprechende Teile kennzeichnen. In den Zeichnungen zeigen:
- Fig. 1
- eine perspektivische Ansicht einer Randbearbeitungsvorrichtung (Edger) für Brillenlinsen von schräg oben / vorne links nach einem bevorzugten Ausführungsbeispiel der Erfindung, mit einer oberen, über drei senkrecht zueinander verlaufende Linearachsen X, Y, Z im Raum verfahrbaren Werkzeugspindel, einer unteren, über einen Schwenkkopf um eine Schwenkachse B verschwenkbaren Werkstückspindel und einem Werkzeugmagazin rechts daneben, wobei zur Freigabe der Sicht auf wesentliche Bauteile bzw. Baugruppen der Vorrichtung und zur Vereinfachung der Darstellung insbesondere eine an einer Flanschfläche des Schwenkkopfs neben der Werkstückspindel angeflanschte Werkstückhalteeinheit einer Abblockeinrichtung, das Maschinengestell, die Bedieneinheit und Steuerung, Teile der Verkleidung und Arbeitsraumumhausung, Ablagen, Türmechanismen und Scheiben, die Versorgungseinrichtungen (einschließlich Leitungen, Schläuche und Rohre) für Strom, Druckluft und Kühlschmierstoff sowie die Mess-, Wartungs- und Sicherheitseinrichtungen weggelassen wurden;
- Fig. 2
- eine abgebrochene, perspektivische Ansicht der Randbearbeitungsvorrichtung gemäß
Fig. 1 im Bereich des Schwenkkopfs, mit der am Schwenkkopf neben der Werkstückspindel angeflanschten Werkstückhalteeinheit, wobei ein Sauger der Werkstückhalteeinheit von oben an einer Brillenlinse anliegt, die ihrerseits vor dem Abblocken über ein Blockstück an der Werkstückspindel gehalten ist; - Fig. 3
- eine abgebrochene, perspektivische Ansicht der Randbearbeitungsvorrichtung gemäß
Fig. 1 im Bereich der Werkstückhalteeinheit vonFig. 2 , die die Brillenlinse vermittels ihres Saugers nach dem Abblocken über dem an der Werkstückspindel gespannten Blockstück hält; - Fig. 4
- eine perspektivische Ansicht der Randbearbeitungsvorrichtung gemäß
Fig. 1 von schräg oben / hinten links mit den Vereinfachungen vonFig. 1 , insbesondere zur Veranschaulichung von Details zu den drei Linearachsen X, Y, Z für die Werkzeugspindel der Vorrichtung; - Fig. 5
- eine Vorderansicht der Randbearbeitungsvorrichtung gemäß
Fig. 1 mit geschlossenem Werkzeugmagazin und ansonsten den Vereinfachungen vonFig. 1 , wobei in einer ersten Variante der Abblockeinrichtung, die mit einem Druckmittel-Hochdruckstrahl arbeitet, eine Düsenbaugruppe in einer Werkzeugaufnahme der Werkzeugspindel auswechselbar gehalten ist, deren Düse über einen quer zur Spindelwelle verlaufenden Schlauchanschluss mit dem Druckmittel versorgt wird; - Fig. 6
- eine der Darstellung in
Fig. 5 im Wesentlichen entsprechende Vorderansicht der Randbearbeitungsvorrichtung gemäßFig. 1 , wobei in einer zweiten Variante der mit einem Druckmittel-Hochdruckstrahl arbeitenden Abblockeinrichtung die Düse der in der Werkzeugaufnahme der Werkzeugspindel abnehmbar gehaltenen Düsenbaugruppe über die als Hohlwelle ausgebildete Spindelwelle der Werkzeugspindel mit dem Druckmittel versorgt wird; - Fig. 7
- eine der Darstellung in
Fig. 5 im Wesentlichen entsprechende Vorderansicht der Randbearbeitungsvorrichtung gemäßFig. 1 , wobei in einer dritten Variante der mit einem Druckmittel-Hochdruckstrahl arbeitenden Abblockeinrichtung deren Düsenbaugruppe seitlich an der Werkzeugspindel fest angebracht und somit zusammen mit der Werkzeugspindel bewegbar ist; - Fig. 8
- ein Ablaufdiagramm eines Verfahrens zur Herstellung von Brillenlinsen aus einem Halbfabrikat, bei dem die Brillenlinse während des gesamten Prozesses auf ein und demselben Blockstück verbleibt und der abschließende Hauptschritt des Abblockens der behandelten Brillenlinse vom Blockstück zweigeteilt ist, mit einem das Abblocken einleitenden Einstech-Unterschritt, bei dem ausgehend von einer Randfläche des Blockstücks angrenzend an oder nahe einer dem Blockstück zugewandten Fläche der Brillenlinse ein Einstich erzeugt wird, der beim weiteren Abblocken als Solltrennstelle zwischen Brillenlinse und Blockstück dient;
- Fig. 9 - 12
- Schnittansichten einer auf einem Blockstück geblockten, behandelten Brillenlinse, die in zeitlicher Abfolge veranschaulichen, wie bei dem vorerwähnten Einstech-Unterschritt ausgehend von der Randfläche des Blockstücks mittels eines nicht geschnitten dargestellten Fingerfräsers nahe der ersten Fläche der Brillenlinse der Einstich als Solltrennstelle für das Abblocken im Blockstück erzeugt wird, wobei die
Fig. 9 den Fingerfräser kurz vor dem spanenden Eingriff mit dem Blockstück zeigt, während in derFig. 12 der Fingerfräser am Ende des Einstech-Unterschritts dargestellt ist; - Fig. 13
- eine perspektivische Ansicht einer auf einem Blockstück geblockten, behandelten Brillenlinse und eines Randbearbeitungswerkzeugs, welches auch mit einem Scheibenfräser ausgerüstet ist, mittels dessen beim Abblocken in dem Einstech-Unterschritt der Einstich im Blockstück erzeugt wird, wobei sich in der prinzipiellen Darstellung von
Fig. 13 der Scheibenfräser in einem Bearbeitungseingriff mit dem Blockstück befindet; - Fig. 14
- eine Draufsicht auf die auf dem Blockstück geblockte, behandelte Brillenlinse und den Scheibenfräser gemäß
Fig. 13 kurz bevor der Scheibenfräser in Bearbeitungseingriff mit dem Blockstück gelangt; und - Fig. 15 & 16
- Seitenansichten der auf dem Blockstück geblockten, behandelten Brillenlinse und des Randbearbeitungswerkzeugs gemäß
Fig. 13 , dessen Scheibenfräser im Einstech-Unterschritt des Abblockens den Einstich im Blockstück erzeugt, wobei dieFig. 15 einen Zustand während der Erzeugung des Einstichs illustriert, während dieFig. 16 das Ende des Einstech-Unterschritts zeigt.
- Fig. 1
- a perspective view of an edge processing device (Edger) for eyeglass lenses obliquely from above / left front according to a preferred embodiment of the invention, with an upper, over three mutually perpendicular linear axes X, Y, Z movable in space tool spindle, a lower, about a swivel head a pivot axis B pivotable workpiece spindle and a tool magazine right next to it, to release the view of essential components or assemblies of the device and to simplify the presentation in particular a flanged to a flange of the swivel head next to the workpiece spindle workpiece holding unit a The blocking device, the machine frame, the operating unit and control, parts of the cladding and workspace enclosure, shelves, door mechanisms and washers, the utilities (including pipes, hoses and pipes) for electricity, compressed air and cooling lubricant, as well as the measuring, maintenance and safety devices have been omitted;
- Fig. 2
- a broken, perspective view of the edge processing device according to
Fig. 1 in the region of the swivel head, with the workpiece holding unit flanged to the swivel head next to the workpiece spindle, a sucker of the workpiece holding unit resting against a spectacle lens from above, which in turn is held against the workpiece spindle by a block piece before blocking; - Fig. 3
- a broken, perspective view of the edge processing device according to
Fig. 1 in the area of the workpiece holding unit ofFig. 2 holding the spectacle lens by means of its teat after blocking over the clamped on the workpiece spindle block piece; - Fig. 4
- a perspective view of the edge processing device according to
Fig. 1 from diagonally up / back left with the simplifications ofFig. 1 in particular for illustrating details of the three linear axes X, Y, Z for the tool spindle of the device; - Fig. 5
- a front view of the edge processing device according to
Fig. 1 with closed tool magazine and otherwise the simplifications ofFig. 1 , where in a first variant of the blocking device, which operates with a pressure medium high pressure jet, a nozzle assembly is held interchangeable in a tool holder of the tool spindle, the nozzle is supplied via a transverse to the spindle shaft hose connection with the pressure medium; - Fig. 6
- one of the illustration in
Fig. 5 essentially corresponding front view of the edge processing device according to FIGFig. 1 , In a second variant of the working with a high-pressure fluid jet blocking device, the nozzle of the tool holder removably held in the tool spindle nozzle assembly is supplied via the trained as a hollow shaft spindle shaft of the tool spindle with the pressure medium; - Fig. 7
- one of the illustration in
Fig. 5 essentially corresponding front view of the edge processing device according to FIGFig. 1 , In a third variant of the working with a high-pressure fluid jet blocking device whose nozzle assembly is fixedly mounted on the side of the tool spindle and thus movable together with the tool spindle; - Fig. 8
- a flow chart of a process for the production of spectacle lenses from a semi-finished product in which the spectacle lens remains on one and the same block piece during the entire process and the final main step of blocking the treated spectacle lens from the block piece is divided into two, with a blocking initiating sub-step starting from an edge surface the block piece adjacent to or near a surface of the spectacle lens facing the block piece, a puncture is created which serves as a predetermined separation point between the spectacle lens and the block piece during further blocking;
- Fig. 9 - 12
- Sectional views of treated on a block piece, treated spectacle lens illustrated in time sequence, as in the aforementioned piercing substep starting from the edge surface of the block piece by means not shown end mill near the first surface of the spectacle lens of the recess as a predetermined separation point for blocking in the block piece is generated, the
Fig. 9 shows the end mill just before the cutting engagement with the block piece, while in theFig. 12 the end mill is shown at the end of the piercing sub-step; - Fig. 13
- a perspective view of a blocked on a block piece, treated spectacle lens and a peripheral processing tool, which is also equipped with a disc milling cutter, by means of which the blocking is made in the puncturing sub-step of the puncture in the block piece, which is in the basic representation of
Fig. 13 the side milling cutter is in machining engagement with the block piece; - Fig. 14
- a plan view of the blocked on the block piece, treated spectacle lens and the disc milling cutter according to
Fig. 13 just before the side milling cutter comes into machining engagement with the block piece; and - FIGS. 15 & 16
- Side views of the treated on the block piece treated eyeglass lens and the edge processing tool according to
Fig. 13 whose disc milling cutter in the piercing sub-step of blocking produces the puncture in the block piece, wherein theFig. 15 illustrates a condition during the generation of the puncture, while theFig. 16 shows the end of the piercing sub-step.
Die
Wie den
Der werkzeugseitige Teil der Bewegungseinrichtung 18 weist allgemein drei Schlitten auf, die eine werkzeugseitige Bewegung in den drei senkrecht zueinander verlaufenden Richtungen x, y, z ermöglichen, nämlich einen X-Schlitten 28 und einen Y-Schlitten 30, die in der Art einer Kreuztischanordnung auf der Oberseite 24 des Maschinenbetts 22 aufeinander gestapelt sind, sowie einen Z-Schlitten 32, der bewegbar an einer dem Arbeitsraum 14 zugewandten Frontseite des Y-Schlittens 30 angeordnet ist. Der werkstückseitige Teil der Bewegungseinrichtung 18 hingegen umfasst allgemein eine Schwenkantriebseinheit 34 mit einem an der Frontseite 26 des Maschinenbetts 22 angeflanschten Schwenkantrieb 36 zum Verschwenken eines in einer Seitenansicht gesehen im Wesentlichen L-förmigen Schwenkkopfs 38 um eine Schwenkachse B, die in der Längenrichtung y der Randbearbeitungsvorrichtung 10 verläuft, sowie eine Werkstückspindel 40, welche an einem in den Arbeitsraum 14 vorkragenden Ende des Schwenkkopfs 38 montiert ist und mittels der eine Spannzange 42 als Bestandteil der Aufnahmeeinrichtung 12 um eine Werkstück-Drehachse A drehend antreibbar ist, die senkrecht zur Schwenkachse B verläuft. Demnach ist die Aufnahmeeinrichtung 12 dazu angepasst, die auf dem Blockstück S geblockte Linse L um die Werkstück-Drehachse A zu drehen.The tool-side part of the
Weitere Details des werkzeugseitigen Teils der Bewegungseinrichtung 18 sind insbesondere den
In analoger Weise sind an der Unterseite des Y-Schlittens 30 zwei sich in Längenrichtung y der Randbearbeitungsvorrichtung 10 erstreckende und parallel zueinander verlaufende Führungsschienen 58, 58' montiert, die der axialen Führung des Y-Schlittens 30 dienen, wozu auf der Oberseite des X-Schlittens 28 zwei Paare von Führungswagen 60, 60' angebracht sind, von denen das eine Paar (
Schließlich sind auf der Rückseite des Z-Schlittens 32 zwei sich in Höhenrichtung z der Randbearbeitungsvorrichtung 10 erstreckende und parallel zueinander verlaufende Führungsschienen 76, 76' montiert, die der axialen Führung des Z-Schlittens 32 an der Vorderseite des Y-Schlittens 30 dienen, wozu der Y-Schlitten 30 an seiner Vorderseite Führungswagen oder -schuhe aufweist (in den Figuren nicht zu erkennen), die mit den Führungsschienen 76, 76' eingreifen. Für den linearen Antrieb des Z-Schlittens 32 ist erneut ein Servomotor 78 vorgesehen, der von unten am Y-Schlitten 30 angeflanscht ist und über einen dritten Zahnriementrieb 80 auf der Oberseite des Y-Schlittens 30 eine am Y-Schlitten 30 drehbar gelagerte Gewindemutter 82 antreibt, die ihrerseits mit einer drehfest am Z-Schlitten 32 befestigten, sich in Höhenrichtung z der Randbearbeitungsvorrichtung 10 erstreckenden Gewindespindel 84 eingreift. Am oberen, freien Ende der Gewindespindel 84 ist diese mit einer Anschlagmutter 86 zur Wegbegrenzung für den Z-Schlitten 32 nach unten versehen.Finally, on the rear side of the Z-
In den
Darüber hinaus weist die Bearbeitungseinrichtung 16 der Randbearbeitungsvorrichtung 10 eine auf der Vorderseite des Z-Schlittens 32 angeflanschte Werkzeugspindel 88 auf, mittels der eine Werkzeugaufnahme, d.h. im dargestellten Ausführungsbeispiel ein Spannfutter 90 zur Aufnahme des Randbearbeitungswerkzeugs W, das mit einer Spindelwelle 91 der Werkzeugspindel 88 drehfest verbunden ist, in der Drehzahl gesteuert um eine Werkzeug-Drehachse C drehend angetrieben werden kann, die in Höhenrichtung z der Randbearbeitungsvorrichtung 10 verläuft.In addition, the
In den
Mit dem insoweit beschriebenen kinematischen Aufbau der Randbearbeitungsvorrichtung 10 können die am Rand E zu bearbeitende, über das Blockstück S in der Spannzange 42 der Werkstückspindel 40 gehaltene Linse L und das jeweilige, am Spannfutter 90 der Werkzeugspindel 88 gespannte und ggf. um die Werkzeug-Drehachse C drehend angetriebene Randbearbeitungswerkzeug W CNC-technisch in den fünf Achsen (A, B, X, Y, Z) so relativ zueinander bewegt werden, dass sämtliche üblichen Randbearbeitungsschritte durchgeführt werden können (siehe hierzu beispielsweise die eingangs diskutierte Druckschrift
Wie ferner den
Für den Fachmann ist ersichtlich, dass der Sauger 104 der Werkstückhalteeinheit 98 mittels der Zylinderanordnung 100 auf die an der Spannzange 42 der Werkstückspindel 40 über das Blockstück S gehaltene Linse L abgesenkt werden kann, so dass der Sauger 104 an der zweiten optisch wirksamen Fläche cc der Linse L zur Anlage gelangt und sich an dieser festsaugt (siehe
Die
Bei den verschiedenen Varianten der Abblockeinrichtung 20 gemäß den
Was die Versorgung mit dem Druckmittel angeht, kann bei der Variante der Abblockeinrichtung 20 gemäß
Für den Fachmann ist ersichtlich, dass die Düse D der Abblockeinrichtung 20 und die über das Blockstück S an der Aufnahmeeinrichtung 12 gehaltene Linse L vermittels der Bewegungsachsen (A, B, X, Y, Z) der Bewegungseinrichtung 18 CNC-technisch so relativ zueinander im Arbeitsraum 14 der Randbearbeitungsvorrichtung 10 positioniert werden können, dass der von der Düse D abgegebene Druckmittel-Hochdruckstrahl an vorbestimmter Stelle auf den Randbereich zwischen Linse L und Blockstück S auftrifft, um die mittels des Saugers 104 der Werkstückhalteeinheit 98 gehaltene Linse L vom Blockstück S abzublocken. Wie eine solche Positionierung im Einzelnen erfolgen kann, wird in der eingangs erwähnten Druckschrift
Wie weiter oben schon erwähnt soll nachfolgend noch das Abblocken der Linse L vom Blockstück S unter Zuhilfenahme eines spanabhebenden Werkzeugs in besonderer Verfahrensausgestaltung unter Bezugnahme auf die
In diesem Zusammenhang zeigt die
Gemäß
In den hier veranschaulichten Verfahrensvarianten werden ferner Blockstück S und Linse L drehend um die Werkstück-Drehachse A angetrieben, um den Einstich N am Blockstück S umlaufend zu erzeugen. Darüber hinaus erfolgt hier in beiden Fällen eine derartige Bewegung des jeweiligen Werkzeugs 106 bzw. 116 relativ zum Blockstück S, dass es einer Krümmung der ersten Fläche cx der behandelten Brillenlinse L im Wesentlichen folgt. Dies wird bei der Verfahrensvariante gemäß den
Den
An den in den
Wenngleich oben das Abblocken unter Zuhilfenahme eines radialen Einstichs N als Solltrennstelle zwischen Linse L und Blockstück S im Zusammenhang mit einem Verfahren zur Herstellung von Brillenlinsen L beschrieben wurde, bei dem der Linsenrohling während der verschiedenen Flächen- und Randbearbeitungs- bzw. -behandlungsschritte auf ein und demselben Blockstück S verbleibt, kann das beschriebene Abblocken natürlich ebenso in anderen Brillenlinsen-Herstellverfahren zum Einsatz kommen, z.B. in solchen, bei denen erst die Flächenbearbeitung auf einem Blockstück und später - vor oder nach etwaigen Beschichtungsschritten - die Randbearbeitung auf einem anderen Blockstück erfolgt.Although above the blocking with the aid of a radial recess N as a predetermined separation point between the lens L and block piece S in connection with a method for producing spectacle lenses L has been described in which the lens blank during Of course, as the various surface and edge processing steps remain on one and the same block S, the described blocking can of course also be used in other eyeglass lens manufacturing methods, for example, those in which only the surface treatment on a block piece and later - before or after any coating steps - the edging is done on another piece of block.
Eine Vorrichtung zur Bearbeitung eines Rands eines Rohlings für eine Linse, insbesondere Brillenlinse, umfasst eine Aufnahmeeinrichtung zum Halten des auf einem Blockstück geblockten Linsenrohlings in einem Arbeitsraum der Randbearbeitungsvorrichtung, eine Bearbeitungseinrichtung, mittels der ein Werkzeug für die Bearbeitung des Rands antreibbar ist, und eine Bewegungseinrichtung zum Erzeugen einer Relativbewegung zwischen Linsenrohling und Werkzeug während der Bearbeitung des Rands in dem Arbeitsraum. Zur Vereinfachung und Verbesserung des Handlings im Zusammenhang mit dem Abblocken der behandelten, insbesondere am Rand bearbeiteten Linse weist die Randbearbeitungsvorrichtung eine Abblockeinrichtung auf, mittels der die Linse im Arbeitsraum vom Blockstück abblockbar ist. Außerdem wird ein Herstellverfahren für Brillenlinsen vorgeschlagen, dessen Abblock-Hauptschritt einen Einstech-Unterschritt umfasst, bei dem ausgehend von der Randfläche des Blockstücks angrenzend an oder nahe einer ersten Fläche der Linse ein Einstich erzeugt wird, der beim weiteren Abblocken als Solltrennstelle zwischen Brillenlinse und Blockstück dient.An apparatus for processing an edge of a blank for a lens, in particular spectacle lens, comprises a receiving device for holding the lens blank blocked on a block piece in a working space of the edge processing device, a processing device by means of which a tool for machining the edge can be driven, and a movement device for generating a relative movement between the lens blank and the tool during the processing of the edge in the working space. To simplify and improve handling in connection with the blocking of the treated, in particular edge-processed lens, the edge processing device has a blocking device, by means of which the lens in the working space from the block piece can be blocked off. In addition, a manufacturing method for spectacle lenses is proposed, the Abblock main step comprises a piercing sub-step in which, starting from the edge surface of the block piece adjacent to or near a first surface of the lens, a puncture is generated, the further blocking as a predetermined separation point between the spectacle lens and block piece serves.
- 1010
- RandbearbeitungsvorrichtungCurling device
- 1212
- Aufnahmeeinrichtungrecording device
- 1414
- Arbeitsraumworking space
- 1616
- Bearbeitungseinrichtungprocessing device
- 1818
- Bewegungseinrichtungmover
- 2020
- AbblockeinrichtungAbblockeinrichtung
- 2222
- Maschinenbettmachine bed
- 2424
- Oberseitetop
- 2626
- Frontseitefront
- 2828
- X-SchlittenX slide
- 3030
- Y-SchlittenY carriage
- 3232
- Z-SchlittenZ slide
- 3434
- SchwenkantriebseinheitSwivel drive unit
- 3636
- SchwenkantriebRotary actuator
- 3838
- Schwenkkopfswivel head
- 4040
- WerkstückspindelWorkpiece spindle
- 4242
- Spannzangecollet
- 44, 44'44, 44 '
- Führungsschieneguide rail
- 46, 46'46, 46 '
- Führungswagencarriages
- 48, 48'48, 48 '
- Endanschlagend stop
- 5050
- Servomotorservomotor
- 5252
- Zahnriementriebtoothed belt drive
- 54, 54'54, 54 '
- Lagerbockbearing block
- 5656
- Gewindespindelscrew
- 58, 58'58, 58 '
- Führungsschieneguide rail
- 60, 60'60, 60 '
- Führungswagencarriages
- 6262
- Servomotorservomotor
- 6464
- Zahnriementriebtoothed belt drive
- 6666
- Lageraugebearing eye
- 6868
- Gewindespindelscrew
- 7070
- Gewindemutterthreaded nut
- 7272
- Anschlagattack
- 7373
- Anschlagattack
- 7474
- Anschlagattack
- 76, 76'76, 76 '
- Führungsschieneguide rail
- 7878
- Servomotorservomotor
- 8080
- Zahnriementriebtoothed belt drive
- 8282
- Gewindemutterthreaded nut
- 8484
- Gewindespindelscrew
- 8686
- Anschlagmutterstop nut
- 8888
- Werkzeugspindeltool spindle
- 9090
- Werkzeugaufnahme / SpannfutterTool holder / chuck
- 9191
- Spindelwellespindle shaft
- 9292
- Werkzeugmagazintool magazine
- 9494
- Klappeflap
- 9696
- KlemmhalterTool holders
- 9898
- WerkstückhalteeinheitWork holding unit
- 100100
- Zylinderanordnungcylinder arrangement
- 102102
- Haltearmholding arm
- 104104
- Saugersucker
- 106106
- Fingerfräserend mill
- 108108
- Düsenbaugruppenozzle assembly
- 110110
- Schlauchanschlusshose connection
- 112112
- Schlauchtube
- 114114
- DrehdurchführungRotary union
- 116116
- Scheibenfräserrouters disc
- AA
- Werkstück-Drehachse (winkellagegeregelt)Workpiece rotation axis (angular position-controlled)
- BB
- Schwenkachse Werkzeug (winkellagegeregelt)Swivel axis tool (angular position-controlled)
- CC
- Werkzeug-Drehachse (drehzahlgesteuert)Tool rotation axis (speed-controlled)
- cccc
- zweite optisch wirksame Fläche am Brillenglassecond optically effective surface on the spectacle lens
- cxcx
- erste optisch wirksame Fläche am Brillenglasfirst optically effective surface on the spectacle lens
- DD
- Düsejet
- Ee
- Rand der LinseEdge of the lens
- FF
- Blockflächeblock face
- LL
- Linse, insbesondere BrillenlinseLens, in particular spectacle lens
- MM
- Blockmaterialblock material
- NN
- Einstichpuncture
- PP
- DruckmittelquellePressure medium source
- Q1, Q2 Q 1 , Q 2
- Abstützflächesupporting
- RR
- Randflächeedge surface
- SS
- Blockstückblock piece
- WW
- RandbearbeitungswerkzeugEdge-machining tool
- XX
- Linearachse X-Schlitten (lagegeregelt)Linear axis X-carriage (position-controlled)
- xx
- Breitenrichtungwidth direction
- YY
- Linearachse Y-Schlitten (lagegeregelt)Linear axis Y-slide (position-controlled)
- yy
- Längenrichtunglength direction
- ZZ
- Linearachse Z-Schlitten (lagegeregelt)Linear axis Z-slide (position-controlled)
- zz
- Höhenrichtungheight direction
Claims (14)
einer Aufnahmeeinrichtung (12) zum Halten des auf einem Blockstück (S) geblockten Linsenrohlings in einem Arbeitsraum (14) der Randbearbeitungsvorrichtung (10),
einer Bearbeitungseinrichtung (16), mittels der ein Werkzeug (W) für die Bearbeitung des Rands (E) antreibbar ist, und
einer Bewegungseinrichtung (18) zum Erzeugen einer Relativbewegung zwischen dem Linsenrohling und dem Werkzeug (W) während der Bearbeitung des Rands (E) in dem Arbeitsraum (14) der Randbearbeitungsvorrichtung (10),
dadurch gekennzeichnet, dass die Randbearbeitungsvorrichtung (10) eine Abblockeinrichtung (20) aufweist, mittels der die randbearbeitete Linse (L) im Arbeitsraum (14) vom Blockstück (S) abblockbar ist.Device (10) for processing an edge (E) of a blank for a lens (L), in particular a spectacle lens, with
a holding device (12) for holding the lens blank blocked on a block piece (S) in a working space (14) of the edge processing device (10),
a processing device (16) by means of which a tool (W) for the machining of the edge (E) can be driven, and
a movement device (18) for generating a relative movement between the lens blank and the tool (W) during the processing of the edge (E) in the working space (14) of the edge processing device (10),
characterized in that the edge processing device (10) has a blocking device (20) by means of which the edge-processed lens (L) in the working space (14) from the block piece (S) can be blocked off.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015011031.4A DE102015011031A1 (en) | 2015-08-22 | 2015-08-22 | Device for edge processing of a lens blank and method for producing spectacle lenses |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3135430A1 true EP3135430A1 (en) | 2017-03-01 |
EP3135430B1 EP3135430B1 (en) | 2018-03-21 |
Family
ID=56686609
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16001791.9A Active EP3135430B1 (en) | 2015-08-22 | 2016-08-12 | Device for edging an optical lens and process for producing optical lenses |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3135430B1 (en) |
DE (1) | DE102015011031A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108907964A (en) * | 2018-08-20 | 2018-11-30 | 临海市中创自动化设备有限公司 | Lens edge grinding machine |
CN113829173A (en) * | 2021-09-22 | 2021-12-24 | 上饶市桐宇光电科技有限公司 | Based on high-efficient grinding device of optical lens piece |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017001679B4 (en) | 2017-02-22 | 2019-05-09 | Schneider Gmbh & Co. Kg | Device and method for blocking a lens |
CN110052916A (en) * | 2019-04-22 | 2019-07-26 | 中国工程物理研究院激光聚变研究中心 | Heavy caliber wedge optical element ultraprecise combined shaping grinding attachment and processing method |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1243380A2 (en) | 2001-03-22 | 2002-09-25 | Loh Optikmaschinen AG | Device for grinding edges of optical lenses |
DE102005038063A1 (en) | 2005-08-10 | 2007-02-15 | Schneider Gmbh + Co. Kg | Preformed block piece with three support points |
EP2093018A1 (en) | 2008-02-25 | 2009-08-26 | Satisloh AG | Block piece for holding an optical workpiece, in particular a spectacle lens, for processing thereof, and method for manufacturing spectacle lenses according to a prescription |
DE102009048590A1 (en) | 2009-10-07 | 2011-04-21 | Satisloh Ag | Apparatus and method for blocking optical workpieces, in particular spectacle lenses |
US20110102739A1 (en) * | 2008-02-14 | 2011-05-05 | Lefort Pascal | Methods and machines for lens deblocking |
EP2542383B1 (en) | 2010-03-04 | 2014-04-16 | Satisloh AG | Device for deblocking optical workpieces, in particular eyeglass lenses |
-
2015
- 2015-08-22 DE DE102015011031.4A patent/DE102015011031A1/en not_active Withdrawn
-
2016
- 2016-08-12 EP EP16001791.9A patent/EP3135430B1/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1243380A2 (en) | 2001-03-22 | 2002-09-25 | Loh Optikmaschinen AG | Device for grinding edges of optical lenses |
DE102005038063A1 (en) | 2005-08-10 | 2007-02-15 | Schneider Gmbh + Co. Kg | Preformed block piece with three support points |
US20110102739A1 (en) * | 2008-02-14 | 2011-05-05 | Lefort Pascal | Methods and machines for lens deblocking |
EP2093018A1 (en) | 2008-02-25 | 2009-08-26 | Satisloh AG | Block piece for holding an optical workpiece, in particular a spectacle lens, for processing thereof, and method for manufacturing spectacle lenses according to a prescription |
DE102009048590A1 (en) | 2009-10-07 | 2011-04-21 | Satisloh Ag | Apparatus and method for blocking optical workpieces, in particular spectacle lenses |
EP2542383B1 (en) | 2010-03-04 | 2014-04-16 | Satisloh AG | Device for deblocking optical workpieces, in particular eyeglass lenses |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108907964A (en) * | 2018-08-20 | 2018-11-30 | 临海市中创自动化设备有限公司 | Lens edge grinding machine |
CN108907964B (en) * | 2018-08-20 | 2023-08-22 | 临海市中创自动化设备有限公司 | Lens edging machine |
CN113829173A (en) * | 2021-09-22 | 2021-12-24 | 上饶市桐宇光电科技有限公司 | Based on high-efficient grinding device of optical lens piece |
CN113829173B (en) * | 2021-09-22 | 2024-01-02 | 上饶市桐宇光电科技有限公司 | Efficient polishing device based on optical lenses |
Also Published As
Publication number | Publication date |
---|---|
DE102015011031A1 (en) | 2017-02-23 |
EP3135430B1 (en) | 2018-03-21 |
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