EP3135430B1 - Machine pour l'usinage du bord de lentilles ophtalmiques et procede de fabrication de lentilles - Google Patents

Machine pour l'usinage du bord de lentilles ophtalmiques et procede de fabrication de lentilles Download PDF

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Publication number
EP3135430B1
EP3135430B1 EP16001791.9A EP16001791A EP3135430B1 EP 3135430 B1 EP3135430 B1 EP 3135430B1 EP 16001791 A EP16001791 A EP 16001791A EP 3135430 B1 EP3135430 B1 EP 3135430B1
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EP
European Patent Office
Prior art keywords
edge
block piece
lens
tool
processing device
Prior art date
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Application number
EP16001791.9A
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German (de)
English (en)
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EP3135430A1 (fr
Inventor
Ernst Michael Leitz
Marc Savoie
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Satisloh AG
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Satisloh AG
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Publication of EP3135430A1 publication Critical patent/EP3135430A1/fr
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    • 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 6.
  • 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 such 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 movement device 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 a Abblock noise, by means of which the edge-processed lens in the working space of the edge processing device from the block piece is blockable and the a pin-shaped or disc-shaped, cutting tool comprises the front or circumference is formed so narrow that it held on the receiving block piece with it blocked, edge processed lens starting from an edge surface of the Blockpiece near the lens can machine without touching the lens or the recording device.
  • the blocking device further comprises a pin-shaped or disc-shaped, cutting tool
  • the front or circumference is so narrow that it held on the receiving block piece with it blocked, edged lens starting from an edge surface of the block piece near the lens Can be machined without touching the lens or the receiving device, can be easily during the blocking of the treated lens of the block piece in a piercing sub-step from the edge surface of the block piece adjacent to or near the block piece facing surface of Lens generate a primarily radially extending recess in Block Gla / block material, which acts as a predetermined separation point between the lens and block piece in further blocking.
  • the arrangement is preferably made such that the receiving device is adapted to rotate the blocked on the block piece lens blank around a workpiece axis of rotation.
  • the processing device of the edge processing device 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.
  • the blocking device with a relative to the rotating block piece only deliverable turning tool has a rotationally driven cutting Tool of the blocking device in particular the advantage of a larger Zeitspanvolumens so that the lens can be blocked faster.
  • 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 invention it is provided on the procedural side that, in the production of spectacle lenses, in which the above-described device for edge processing is used and the following main procedural steps are performed in the order given: (a) providing a lens blank having a first surface, one with respect to the first (B) blocking the lens blank onto a block piece, the first face of the lens blank facing 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 surface and / or the edge, wherein the treating comprises at least one machining of the second surface to produce a geometry according to a recipe and / or machining the edge to produce a rim geometry that includes inserting the beh and allowing the eyeglass lens to be placed in a rack or lens mount, and (d) blocking the treated eyeglass 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
  • 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, the treated spectacle lens being spared in comparison with a high-pressure blocking method, ie. there is no danger that the partly tempered outer optical surfaces in the edge region of the spectacle lens will be damaged by particles which may be present at high speed 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 also advantageously serves the possibly also automated handling of the treated spectacle lens, i. this can be removed from the processing device while engaging the (rest) block piece, the latter protecting over its entire area the first surface of the treated spectacle lens.
  • 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 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.
  • These area ratios allow the treated spectacle lens to be slightly tilted with respect to the partially ridged (remainder) block piece and thus easily detached therefrom, i. without the mechanical, final separation of spectacle lens and (rest) block piece a great effort would be needed.
  • the piercing sub-step may be followed by a final blocking step, in which the treated spectacle lens is pulled off the block piece with mechanical force, which can be applied, for example, by an automatic loading system, but preferably 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Eyeglasses (AREA)

Claims (9)

  1. Dispositif (10) d'usinage d'un bord (E) d'une ébauche pour une lentille (L), en particulier une lentille ophtalmique, comprenant
    un système de réception (12) destiné à retenir l'ébauche de lentille glantée sur une molette de glantage (S) dans une chambre de travail (14) du dispositif d'usinage de bord (10),
    un système d'usinage (16), au moyen duquel un outil (W) pour l'usinage du bord (E) peut être entraîné, et
    un système de déplacement (18) destiné à produire un mouvement relatif entre l'ébauche de lentille et l'outil (W) pendant l'usinage du bord (E) dans la chambre de travail (14) du dispositif d'usinage de bord (10), et un système de déglantage (20), au moyen duquel la lentille (L) dont le bord est usiné peut être déglantée de la molette de glantage (S) dans la chambre de travail (14),
    caractérisé en ce que le système de déglantage (20) comporte un outil d'enlèvement de copeaux (106, 116) en forme de tige ou de disque, qui est étroit frontalement ou sur sa circonférence, de manière à être en mesure d'usiner la molette de glantage (S) retenue sur le système de réception (12) et sur laquelle la lentille (L) dont le bord est usiné est glantée, à partir d'une surface marginale (R) de la molette de glantage (S) à proximité de la lentille (L), sans entrer en contact avec la lentille (L) ou le système de réception (12).
  2. Dispositif d'usinage de bord (10) selon la revendication 1, caractérisé en ce qu'au moins une partie ayant une action de séparation du système de déglantage (20) peut être positionnée au moyen du système de déplacement (18) du dispositif d'usinage de bord (10) par rapport à la surface marginale (R) de la molette de glantage (S) retenue sur le système de réception (12).
  3. Dispositif d'usinage de bord (10) selon la revendication 1 ou 2, caractérisé en ce que le système de réception (12) est adapté à amener en rotation l'ébauche de lentille glantée sur la molette de glantage (S) autour d'un axe de rotation de pièce (A).
  4. Dispositif d'usinage de bord (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que le système d'usinage (16) du dispositif d'usinage de bord (10) comprend une broche porte-outil (88) pourvue d'un porte-outil (90), dans lequel l'outil d'enlèvement de copeaux (106, 116) du système de glantage (20), lequel outil est logé dans le porte-outil (90), peut être entraîné en rotation autour d'un axe de rotation d'outil (C) au moyen de la broche porte-outil (88).
  5. Dispositif d'usinage de bord (10) selon la revendication 4, caractérisé en ce que l'outil d'enlèvement de copeaux est une fraise à queue (106) ou un outil de coupe en forme de disque, tel qu'une fraise à disque (116) ou une lame de scie.
  6. Procédé de fabrication de lentilles ophtalmiques (L) au moyen d'un dispositif (10) selon l'une quelconque des revendications précédentes, comprenant les étapes principales suivantes, se déroulant dans l'ordre indiqué :
    (a) la fourniture d'une ébauche de lentille, qui présente une première surface (cx), une deuxième surface (cc) opposée à la première surface (cx) et un bord (E) entre la première surface (cx) et la deuxième surface (cc),
    (b) le glantage de l'ébauche de lentille sur une molette de glantage (S), dans lequel la première surface (cx) de l'ébauche de lentille est tournée vers une surface de glantage (F) de la molette de glantage (S), surface de glantage dans le prolongement de laquelle se situe une surface marginale (R) de la molette de glantage (S),
    (c) le traitement de l'ébauche de lentille glantée sur la deuxième surface (cc) et/ou le bord (E), dans lequel le traitement comprend au moins un usinage de la deuxième surface (cc) pour produire une géométrie conformément à une prescription et/ou un usinage du bord (E) pour produire une géométrie marginale autorisant l'insertion de la lentille ophtalmique (L) traitée dans un châssis ou un porte-lentille, et
    (d) le déglantage de la lentille ophtalmique (L) traitée de la molette de glantage (S),
    caractérisé en ce que l'étape principale (d) du déglantage de la lentille ophtalmique (L) traitée de la molette de déglantage (S) comprend une sous-étape de perforation (d.1), selon laquelle une entaille (N) est ménagée à partir de la surface marginale (R) de la molette de glantage (S) de manière adjacente à la première surface (cx) ou à proximité de celle-ci, laquelle entaille sert, en cas de déglantage supplémentaire, de point destiné à la séparation entre la lentille ophtalmique (L) et la molette de glantage (S), dans lequel l'entaille (N) est ménagée au moyen de l'outil d'enlèvement de copeaux (106, 116) en forme de tige ou de disque, lequel s'enfonce dans la molette de glantage (S) de manière à enlever des copeaux.
  7. Procédé selon la revendication 6, caractérisé en ce que l'outil d'enlèvement de copeaux (106, 116), lorsque l'entaille (N) est ménagée, est déplacé radialement et le cas échéant axialement par rapport à la molette de glantage (S), de manière à sensiblement suivre une courbure de la première surface (cx) de la lentille ophtalmique (L) traitée.
  8. Procédé selon la revendication 6 ou 7, caractérisé en ce que la lentille ophtalmique (L) traitée s'appuie sur la molette de glantage (S), avant le déglantage (d), sur toute l'étendue d'une première surface d'appui (Q1) plus importante et, une fois l'entaille (N) ménagée, sur toute l'étendue d'une deuxième surface d'appui (Q2) plus petite, dans lequel un rapport de surface de la première à la deuxième surface d'appui (Q1, Q2) est compris entre 1,5 et 100.
  9. Procédé selon l'une quelconque des revendications 6 à 8, caractérisé en ce qu'une dernière étape (d.2) du déglandage (d), au cours de laquelle la lentille ophtalmique (L) traitée est retirée de la molette de glandage (S) au moyen d'une force mécanique, fait suite à la sous-étape de perforation (d.1).
EP16001791.9A 2015-08-22 2016-08-12 Machine pour l'usinage du bord de lentilles ophtalmiques et procede de fabrication de lentilles Active EP3135430B1 (fr)

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DE102015011031.4A DE102015011031A1 (de) 2015-08-22 2015-08-22 Vorrichtung zur Randbearbeitung eines Linsenrohlings und Verfahren zur Herstellung von Brillenlinsen

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DE102017001679B4 (de) 2017-02-22 2019-05-09 Schneider Gmbh & Co. Kg Vorrichtung und Verfahren zum Abblocken einer Linse
CN108907964B (zh) * 2018-08-20 2023-08-22 临海市中创自动化设备有限公司 镜片磨边机
CN110052916A (zh) * 2019-04-22 2019-07-26 中国工程物理研究院激光聚变研究中心 大口径楔板光学元件超精密复合成形磨削装置及加工方法
CN113829173B (zh) * 2021-09-22 2024-01-02 上饶市桐宇光电科技有限公司 一种基于光学镜片高效打磨装置

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DE10114239A1 (de) 2001-03-22 2002-10-02 Loh Optikmaschinen Ag Vorrichtung zur Randbearbeitung von optischen Linsen
DE102005038063A1 (de) 2005-08-10 2007-02-15 Schneider Gmbh + Co. Kg Vorgeformtes Blockstück mit drei Auflagepunkten
GB0802651D0 (en) * 2008-02-14 2008-03-19 3M Innovative Properties Co Methods and machines for lens deblocking
EP2093018B2 (fr) 2008-02-25 2017-11-01 Satisloh AG Pièce de bloc pour maintenir une pièce de travail optique, en particulier un verre de lunette, pour traitement associé, et procédé de fabrication de verres de lunettes selon une prescription
DE102009048590B4 (de) 2009-10-07 2020-06-18 Satisloh Ag Vorrichtung zum Abblocken von optischen Werkstücken, insbesondere Brillengläsern
DE102010010334B4 (de) 2010-03-04 2012-01-19 Satisloh Ag Vorrichtung zum Abblocken von optischen Werkstücken, insbesondere Brillengläsern

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