EP2214865B1 - Device for correcting the edging of an ophthalmic lens and method for edging an ophthalmic lens - Google Patents

Device for correcting the edging of an ophthalmic lens and method for edging an ophthalmic lens Download PDF

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Publication number
EP2214865B1
EP2214865B1 EP08856411A EP08856411A EP2214865B1 EP 2214865 B1 EP2214865 B1 EP 2214865B1 EP 08856411 A EP08856411 A EP 08856411A EP 08856411 A EP08856411 A EP 08856411A EP 2214865 B1 EP2214865 B1 EP 2214865B1
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EP
European Patent Office
Prior art keywords
ophthalmic lens
blocking
bevel
lens
axis
Prior art date
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Application number
EP08856411A
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German (de)
French (fr)
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EP2214865B9 (en
EP2214865A2 (en
Inventor
Thomas Aenishanslin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EssilorLuxottica SA
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Essilor International Compagnie Generale dOptique SA
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Publication of EP2214865B1 publication Critical patent/EP2214865B1/en
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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
    • B24B9/148—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 electrically, e.g. numerically, controlled
    • 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
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
    • B24B47/225—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation for bevelling optical work, e.g. lenses

Definitions

  • the present invention relates generally to the machining of ophthalmic lenses and more particularly to the recovery of the trimming of beveled ophthalmic lenses to facilitate their interlocking in eyeglass frame circles.
  • It relates more particularly to a device for recovering the trimming of a beveled ophthalmic lens. It also relates to a method of trimming an ophthalmic lens comprising a step of beveling the lens and a step of taking up the edge of this beveled lens.
  • machining we are more particularly interested in the third operation known as machining. This is specifically for the optician to cut the ophthalmic lens so that it can mechanically and aesthetically adapt to the shape of the corresponding circle of the selected frame, while ensuring the best optical function for which it was conceived.
  • This machining operation includes, in the case of rimmed frames, a beveling step for forming on the edge of the lens a rib commonly called bevel able to fit into a bezel of the rim of the frame, that is, ie in the groove running along the inner face of the circle.
  • the bevel is generally made close to the front face of the lens, so that it is bordered on its rear side by the remaining part of the edge of the lens which has a width that is often large and which is commonly called back bevel foot.
  • the strongly arched frames enveloping the faces of the carriers are experiencing a growing success.
  • the circles of this type of strongly arched frames are then twisted, especially in their temporal zones, to adapt to the shapes of the lenses.
  • the interlocking of the lens in the corresponding circle of the frame is achieved by bringing the lens through the front of the frame and inserting it by pressing into the circle to engage the bevel of the lens in the bezel of the circle of the mount.
  • the rear bevel foot extends along a cylindrical surface.
  • the optician proceeds to a recovery of the entire portion of the ophthalmic lens, reducing its radius, so as to machine in particular the aforementioned conflict zones.
  • the device comprises a frame a lens holder and two lens machining tools arranged on either side of this lens. It also comprises means for actuating each machining tool, including a first worm to allow the tool to translate parallel to the locking axis of the lens a second worm to allow the tool to radially translate relative to this locking pin and a motor to allow the tool to pivot relative to the axis of locking of the lens
  • the method described comprises sweating a first step of beveling the lens during which the two sides of the bevel are respectively machined by the two machining tools. It also comprises a second step of machining the bevel feet during which the front and rear bevel feet are machined in an inclined manner with respect to the locking pin. of the lens which facilitates the subsequent interlocking of the lens in its circle. If finally has a third step of chamfering the peripheral edges front and rear of the lens,
  • the present invention proposes a device and a reliable and inexpensive method, to reduce the conflict zones without degrading the quality of the maintenance of the lens in its circle.
  • the bevel foot resulting from the clipping recovery extends in a quasi-conical surface of shape close to that the inner face of the corresponding circle of the mount. As a result, this recovery makes it possible to plane the zones of conflict which prevented the insertion of the lens in its circle.
  • the axial mobility of the lens and the first abutment means can mechanically maintain the only rear foot of the ophthalmic lens facing the machining tool. In this way, only the rear bevel foot is machined by the tool. The bevel is left intact, so that the quality of the maintenance of the lens in the frame remains unchanged.
  • the first rigid abutment means being fixed relative to the machining tool, they allow to guide the edge of the lens when the latter rotates, so that the only rear foot of bevel remains facing the work surface of the machining tool.
  • a first advantageous characteristic of the trimming method according to the invention is mentioned in claim 2.
  • the first abutment means are elastic and form means for returning the lens in contact with the tool.
  • the axial mobility of the lens and the return of the locking means and rotational drive of the lens then allow to mechanically maintain a stop connected to the machining tool in contact with the rear flank of the bevel.
  • the machining tool is then guided mechanically by the bevel to machine the only rear foot of bevel.
  • the inclination of the working generatrix with respect to the locking axis remains constant and between 5 and 40 degrees, preferably equal to 12 degrees, or varies to reach a maximum value. within this range of values.
  • said recovery step comprises machining the entire surface of the rear bevel foot.
  • This recovery device 1 is intended to machine a portion of the edge of an ophthalmic lens 100 previously bevelled, so that this lens is mountable in one of the circles of the eyeglass frame chosen by the future carrier of this lens.
  • bevel is understood to mean a lens whose contour has been cut in order, on the one hand, to have a shape identical to the contour of the corresponding circle of the frame, and, on the other hand, to have a bevel along its edge.
  • bevel we mean of course the conventional interlocking ribs of triangular sections such as those shown on the Figures 5 and 6 but also those conceivable sections of different shapes, for example rectangular or rounded.
  • the bevel 101 has a leading edge 106 turned on the side of the optical front face 104 of the ophthalmic lens 100 and a rear flank 103 turned on the opposite side. This bevel 101 is further bordered, at least on the side of its rear flank 103, a rear foot 102 bevel initially cylindrical.
  • the bevel 101 of the ophthalmic lens 100 is anyway shaped to fit into a bezel 111 of the frame 110 of the frame, that is to say in a groove running along the inner face of the circle 110. As represented on the Figures 5 and 6 this groove has a triangular section. Alternatively, it may also have a section of different shape, for example rectangular or rounded.
  • the inner face of the circle 110 further comprises, on either side of the bezel 111, a front rim 113 and a trailing edge 112.
  • the recovery device 1 is more particularly intended for machining the rear bevel foot 102 of the ophthalmic lens 100 in order to avoid, during the engagement of the ophthalmic lens 100 in its circle 110, any contact between the rear bevel foot 102 and the trailing edge 112 of the inner face of the circle 110.
  • this recovery device 1 mainly comprises a frame 2 on which are mounted a machining tool 7 and a lens holder 10.
  • the lens holder 10 is connected to the frame by mechanical connection means allowing a variation of the spacing between the lens holder 10 and the machining tool 7.
  • the lens holder comprises a base which forms a rocker freely pivotally mounted on the frame 2 about a horizontal axis A5, called the rocker axis.
  • the rocker 14 has a through bore which is engaged on a shaft 3 secured to the frame.
  • the flip-flop 14 is also freely mounted in translation on the shaft 3 along the flip-flop axis A5 between two abutment positions, including a right abutment position and a left abutment position.
  • the lens holder 10 further comprises biasing means of the rocker 14 in the right stop position, constituted by a compression spring 4 engaged on the shaft 3, in compression between the rocker 14 and a portion of the frame 2.
  • the lens holder 10 is equipped with transverse return means for reminding the lens holder 10 during machining towards the machining tool 7 and thus keeping the edge of the lens in contact with the working surface of the lens. machining tool 7.
  • These return means are here gravitational, that is to say that they result from the sole weight of the rocker 14.
  • the center of gravity of the latch 14 is located at a distance of the rocker axis A5 and the rocker 14 is weighted so that its weight allows it to naturally rotate around the rocker axis A5, towards the machining tool 7.
  • these transverse biasing means may be elastic (torsion spring type), electro-mechanical, or electro-magnetic.
  • the lens holder 10 is finally equipped with locking means and rotational drive of the ophthalmic lens 100.
  • These means comprise two shafts 11 for blocking the lens, aligned with each other along an axis A1 called axis blocking, which is parallel to and distinct from the flip-flop axis A5.
  • axis blocking which is parallel to and distinct from the flip-flop axis A5.
  • the two shafts 11 are mounted on the rocker 14 to turn around the locking pin A1 and are rotated synchronously by a motor (not shown) via a common drive mechanism (not shown) embedded in the latch 14.
  • a motor not shown
  • a common drive mechanism not shown
  • it can be provided to drive the two shafts by two separate motors synchronized mechanically or electronically. It will also be possible to provide manual drive means for the two shafts in rotation.
  • Each of the shafts 11 has a free end which faces the free end of the other shaft and which is equipped with a locking nose 12 of the ophthalmic lens 100.
  • the two locking noses 12 are generally of revolution around each other.
  • the locking pin A1 and each have a generally transverse application face arranged to bear against the corresponding optical face of the ophthalmic lens 100.
  • the two shafts 11 are movable in translation along the blocking axis A1 to effect the compression in axial compression of the ophthalmic lens 100 between the two locking noses 12.
  • These translations are here manually controlled by means of rollers 13 arranged with either side of the rocker 14, in the axis of the shafts 11, to be accessible to the user.
  • These knobs are here linked to worms screwed into threaded bores of the shafts 11, so that the pivoting of the knobs 13 brings the two shafts 11 closer to one another to rigidly block the ophthalmic lens 100.
  • these axial translations of the shafts 11 may be controlled otherwise, for example by ad hoc drive motors housed in the latch. In another variant, it may be provided that only one of these two trees is movable in translation.
  • the machining tool is in this case constituted by a grinding wheel 7 rotatably mounted about an axis of rotation A3.
  • the machining tool may be constituted by a cutter or a knife rotatably mounted about the axis of rotation A3.
  • a machining tool A6 is defined on this machining tool ( figure 3 ) as being the axis which is coplanar with the axis of rotation A3, which belongs to or is tangent to the working surface of the machining tool and which is closest to the ophthalmic lens locking shafts 11
  • this generating work corresponds to the line of contact between the machining tool and the lens.
  • the tool is a cutter or a knife, this contact is not continuous but rather periodic.
  • the grinding wheel 7 is here cylindrical of revolution and is rotated about the axis of rotation A3 by an electric motor 8 whose body is fixed to the frame 2 and whose output shaft directly carries the grinding wheel.
  • the motor 8 is mounted on the frame so that the axis of rotation A3 is inclined at an angle ALPHA with respect to the locking pin A1.
  • the work generator A6 of the grinding wheel 7 is inclined at the same angle with respect to the locking pin A1. Due to this inclination, the grinding wheel 7 is adapted to machine the edge of the ophthalmic lens 100 by "breaking" its rear edge and conferring on its rear foot 102 bevel a quasi-conical shape, that is to say a shape approximated to that of a cone.
  • the angle of inclination ALPHA of this work generator A6 with respect to the blocking axis A1 is preferably between 5 and 40 degrees. It is here equal to 12 degrees.
  • the axis of rotation of the grinding wheel is parallel to the locking axis of the lens and that the grinding wheel is conical of revolution about its axis of rotation, so that its work generator is inclined relative to the locking pin A1.
  • the axis of rotation of the grinding wheel is inclined relative to the locking axis of the lens and that the grinding wheel is conical of revolution about its axis of rotation, so that its generator working angle is inclined relative to the blocking axis A1.
  • the machining tool may comprise a set of grinding wheels, with in particular a beveling grinding wheel, in such a way that the recovery device is able to cut out and take back the ophthalmic lenses of initially circular contours (semi-circular lenses). finite).
  • means for moistening the grinding wheel which are constituted by a sponge 6 fixed to the frame 2 and located under the grinding wheel 7, in contact with its working surface.
  • the recovery device 1 furthermore comprises first rigid or elastic axial abutment means 30 for, during machining, opposing the displacement of the ophthalmic lens 100 in the direction opposite to the point P1 which is defined as the point blocking pin A1 which is closest to the work generator A6 ( figure 3 ).
  • the first axial stop means 30 are rigid and are shaped to form a mechanical stop axially adjustable relative to the grinding wheel 7, along the blocking axis A1. This mechanical stop is more precisely arranged so that the periphery of the front face 104 of the ophthalmic lens 100 can bear against it.
  • the lens being naturally returned to its right abutment position by the compression spring 4, it is provided that the lens is constantly resting against these first axial abutment means 30.
  • the first axial abutment means 30 are here mounted on a plate 20 provided with a single pivotal mobility relative to the frame 2 about an axis A2, called the pivot axis, parallel to the flip-flop axis A5.
  • the plate 20 comprises a rectangular plate 21, one of whose edges is provided with a sleeve traversed by a shaft 5 which is fixed on the frame 2, below the shaft 3 and parallel thereto .
  • the sleeve 22 is locked in translation on this shaft 5, for example by means of circlips.
  • the plate 20 can pivot about the pivot axis A2 to rise in the direction of the lens holder 10 or to lower towards the grinding wheel 7.
  • the plate 21 is perforated to allow, in the lowered position, the passage of the grinding wheel 7 through said plate, so that it can perform its machining function.
  • the first axial abutment means 30 comprise an arm 31, formed here by a metal rod. This arm 31 is provided at mid-length with a bore engaged on a pin of the plate 20, so that it is rotatable relative to this plate 20 about an abutment axis A4 normal to the plane of the plate 20.
  • This arm is further extended by a forearm 32 provided at its free end with a nylon wheel 33 adapted to roll on the front optical side of the lens, without scratching it, when the lens pivots about the axis blocking A1.
  • the forearm 32 is rotatably mounted on the arm 31 about an axis parallel to the abutment axis A4.
  • a vernier adjustment 34 is arranged on the forearm 32 so that its pivoting allows fine adjustment of the orientation of the forearm 32 relative to the arm 31.
  • a screw can block the rotation of the front -arm relative to the arm.
  • the first axial abutment means 30 further comprise a lever 25 rotatably mounted on the plate 20 about an axis parallel to the abutment axis A4.
  • This lever 25 is provided with a cam adapted to abut against the end of the arm 31 opposite to the forearm 32.
  • This lever is provided to have two stable positions, including an engaged position in which the cam is in position. transverse support against the arm and a disengaged position in which the cam is set back from the arm.
  • the first axial stop means 30 are axially adjustable to change the position of the wheel 33 relative to the grinding wheel 7, by changing the angular position of the arm 31 relative to the platen 20 (around the locking pin A4) and the forearm 32 relative to the arm 31. More specifically, the combination of the vernier 34 and the lever 25 allows the user to fine tune the position of the roulette 33 and hence the axial position of the edge of the lens relative to the grinding wheel.
  • the first axial abutment means 30 may be elastic, to remind during machining ophthalmic lens 100 locked in the locking means and rotational drive 11, 12 in the direction of point P1.
  • these first elastic axial abutment means 30 are arranged to exert a return force on the front optical face 104 of the ophthalmic lens 100, along an axis substantially parallel to the blocking axis A1, so as to maintain the trailing edge 103 of the bevel 101 of the ophthalmic lens 100 in contact with second abutment means 51 associated with the machining tool 7.
  • first axial abutment means 30 are able to exert a return force on the lens of intensity less than the intensity of the force exerted by the transverse biasing means of the latch 14 on the lens. Therefore, when the lens is rotated about the locking pin A1 and is brought into contact with the grinding wheel by the transverse return means, the contact of the rear flank 103 of the bevel 101 against the second stop means 51 allows axially guiding the lens relative to the machining tool, so that the working surface of the grinding wheel 7 remains in contact with the rear bevel foot 102.
  • the second abutment means are formed by a flank 51 of the machining tool 7.
  • the first elastic axial abutment means 30 allow the rear flank 103 of the bevel 101 of the lens 100 to be pressed directly against this flank 51 7.
  • the flank 51 of the grinding wheel 7 is not abrasive to ensure that the grinding wheel slides without effort of removal of material against the rear flank 103 of the bevel 101.
  • said second abutment means may be formed by an additional member separate from the grinding wheel.
  • this additional member 50 may be constituted by a rigid disk mounted free to rotate on the shaft of the grinding wheel 7, at a distance from the latter. Thus the rigid disk does not turn against the ophthalmic lens 100, so that it preserves the geometric integrity of the bevel 101.
  • this additional member may be directly attached to the frame 2, in a fixed position relative to the grinding wheel 7.
  • the recovery device 1 comprises a cross depth stop 26 which is adjustable in height relative to the grinding wheel 7, to limit the capacity of machining depth of this millstone.
  • This stop depth 26 pass is reported on the plate 20, above a circular opening (not visible in the figures) which is formed in the plate and by which the grinding wheel 7 protrudes.
  • the stop is here constituted by a cover 26 having a flat peripheral portion 27 which is fixed by screw to the plate 20, and a curved central portion 28 which extends above said circular opening.
  • This curved central portion 28 is opened by a rectangular window 29 designed so that only a radial end portion of the grinding wheel 7 protrudes above the plate 20.
  • This depth stop 26 is adjustable in height by changing the angular position of the plate 20 about the pivot axis A2.
  • the frame 2 comprises an adjustment knob 9 graduated angularly which is accessible to the user and whose adjustment of the angular position allows to change the height relative to the frame 2.
  • This adjustment wheel 9 is located under the platen 20, in contact with the end edge of the plate 20 opposite the pivot axis A2.
  • the plate 20 is pierced with a threaded bore hosting a screw 24 whose operating head is accessible to the user and whose free end is supported against the upper face of the adjustment wheel 9. The association of this screw 24 and this adjustment wheel 9 then allows the user to fine tune the position of the plate 20 about the pivot axis A2 and hence the depth of recovery.
  • the recovery device 1 comprises control means 40 of the actuating motors of the grinding wheel 7 and the locking shafts 11 of the ophthalmic lens 100.
  • These control means here comprise two switches 41, 42 which make it possible to start or stop each motor.
  • the method according to the invention consists in cutting the ophthalmic lens 100 so that its bevel 101 is easily nestable in the bezel 111 of the circle 110 of the eyeglass frame selected by the wearer.
  • This method comprises three successive main steps, including a first step of bevelling of the ophthalmic lens 100, a second step of blocking this lens on the lens holder 10 of the recovery device 1, and a third step of recovery of the back foot of bevel 102 of this lens by the grinding wheel 7 of the recovery device 1.
  • a beveling apparatus which is not the subject of the present invention.
  • a beveling apparatus well known to those skilled in the art, is for example described in the document US 6,327,790 or marketed by the plaintiff under the trademark Kappa. It generally comprises shafts for holding and rotating the ophthalmic lens to bevel around a first axis, and a beveling wheel which is provided with a bevelling groove and which is rotatably mounted around a second axis substantially parallel to the first axis.
  • the lens is locked on the holding shafts and then is cut off by the beveling wheel by varying, for each angular position of the lens around the first axis, the spacing between the first axis and the second axis.
  • the axial position of the lens relative to the beveling groove is also controlled. For aesthetic reasons, this axial control is carried out so that the bevel 101 extends close to the front optical face 104 of the ophthalmic lens 100.
  • the bevel 101 is machined at the edge of the optical front face 104 of the lens, so that at the end of this beveling step, the edge of the lens is devoid of foot before bevel and it comprises a 102 cylindrical bevel rear foot of large width.
  • the bevel 101 may be machined at a distance from the edge of the optical front face 104 of the lens, so that at the end of this beveling step, the edge of the lens comprises, besides a cylindrical bevel rear foot 102 of large width, a cylindrical bevel fore foot 105 of smaller width.
  • the lens is then extracted from the clipping apparatus to be nested in the circle 110 of the eyeglass frame.
  • high-arched lens means a lens whose radius of curvature of the front optical face is less than 120 millimeters.
  • significant thickness is understood to mean a lens whose maximum thickness of the wafer is greater than 7 millimeters.
  • the detection of such a problem can be performed directly after the beveling of the lens, without attempting to nest the lens in the frame. For example, it will be possible to acquire the thickness of the slice of the lens and / or its camber, and then compare these acquired values with predetermined threshold values beyond which the risk that a nesting problem appears is great.
  • the user raises the rocker 14 by rotating it around the rocker axis A5, then it proceeds to lock the lens between the two shafts 11 of the door
  • the shafts 11, movable in translation along the blocking axis A1 are actuated by means of the knurls 13 to firmly grip the ophthalmic lens 100 between the application faces of the locking noses 12.
  • the position of the lens relative to the blocking pin A1 does not matter. In particular, it is not necessary to center the lens on this axis. On the other hand, it is important to check that the locking noses 12 do not protrude from the lens.
  • the user actuates the lever 25 so as to move the wheel 33 away from the grinding wheel 7. Then he descends the rocker 14 by positioning the rear flank 103 of the bevel 101 and the rear bevel foot 102 of the ophthalmic lens 100 against the grinding wheel 7. Finally, it returns the lever 25 to the initial position so that the first axial stop means 30 maintain the lens near the grinding wheel.
  • the user adjusts the position of the lens relative to the grinding wheel 7, positioning the rear of the bevel flush with the right flank of the grinding wheel 7. In other words, it turn the vernier so that only the rear bevel foot of the lens is facing the work surface of the grinding wheel 7.
  • the rear flank 103 of the bevel 101 of the ophthalmic lens 100 is held in abutment against the edge of the grinding wheel 7 by the first axial stop means 30 while the rear bevel foot 102 of the ophthalmic lens 100 is maintained. resting against the work generator A6 of the machining tool 7 by the transverse return means (that is to say in this case by the weight of the rocker 14).
  • the user adjusts the depth of the grinding wheel 7 by turning the adjustment wheel 9, so as to set the depth stop 26 to the desired height.
  • the screw 24 will be used only occasionally, in order to calibrate the recovery device 1 so that the graduations marked on the adjustment wheel 9 correspond to the actual pass depths, in millimeters.
  • the "zero" of the adjustment wheel 9 will be adjusted by positioning, with the aid of the screw 24, the opening 29 of the depth-of-depth stop 26 at the outcrop of the working surface of the grinding wheel 7.
  • the user starts the motor 8 for actuating the grinding wheel 7, so as to start machining the rear bevel foot 102. Then, when the apex of the bevel 101 of the When the lens comes into contact with the depth stop 26, the user verifies that the chosen depth of passage D1 corresponds to that desired. If it is not, it adjusts the height of the stop.
  • the user controls the stopping of the two motors and then extracts the ophthalmic lens 100 from the shafts 11 with the help of the knobs 13.
  • the lens thus recovered is then easily nested in the circle 110 of the selected frame, without any interference no longer appears between the rear bevel foot 102 of the ophthalmic lens 100 and the rear flange 112 of the inner face of the circle 110.
  • the user may again install the lens in the device so as to re-machine its rear bevel foot with a greater depth of pass.
  • the first resilient axial abutment means to remind the ophthalmic lens against the grinding wheel, can directly act on the locking shafts of the lens.
  • the rocker has no translational mobility.
  • the axial translation mobility of the shafts is used to elastically and synchronously return the two shafts to the left, so as to maintain the trailing edge of the bevel of the ophthalmic lens in contact with the edge of the grinding wheel.

Abstract

The method involves beveling an ophthalmic lens (100) to form a bevel on edge of the lens surrounded by a rear foot of the bevel, and blocking the ophthalmic lens beveled in a rotatably driving and blocking shaft (11) and a blocking nose (12) around a blocking axis (A1). The edge is retrieved from the ophthalmic lens blocked in the shaft and the nose. The edge retrieving process is carried by machining the rear foot, excluding the bevel, on a portion of surface of the foot using a grinding wheel (7) whose work generator is inclined with respect to the axis (A1). An independent claim is also included for a device for retrieving trimming of an ophthalmic lens.

Description

La présente invention concerne de manière générale l'usinage des lentilles ophtalmiques et plus particulièrement la reprise du détourage des lentilles ophtalmiques biseautées pour faciliter leur emboîtement dans des cercles de montures de lunettes.The present invention relates generally to the machining of ophthalmic lenses and more particularly to the recovery of the trimming of beveled ophthalmic lenses to facilitate their interlocking in eyeglass frame circles.

Elle concerne plus particulièrement un dispositif de reprise du détourage d'une lentille ophtalmique biseautée. Elle concerne également un procédé de détourage d'une lentille ophtalmique comportant une étape de biseautage de la lentille et une étape de reprise de la tranche de cette lentille biseautée.It relates more particularly to a device for recovering the trimming of a beveled ophthalmic lens. It also relates to a method of trimming an ophthalmic lens comprising a step of beveling the lens and a step of taking up the edge of this beveled lens.

ARRIÈRE-PLAN TECHNOLOGIQUETECHNOLOGICAL BACKGROUND

La partie technique du métier de l'opticien consiste à monter une paire de lentilles ophtalmiques correctrices sur une monture de lunettes sélectionnée par un porteur. Ce montage se décompose en trois opérations principales :

  • la mesure de la forme des contours intérieurs des cercles de la monture,
  • le centrage de chaque lentille qui consiste à positionner et orienter convenablement chaque lentille en regard de chaque oeil du porteur, puis
  • l'usinage de chaque lentille qui consiste à découper ou détourer son contour à la forme souhaitée, compte tenu des mesures réalisées sur la monture et des paramètres de centrage définis.
The technical part of the optician's profession is to mount a pair of corrective ophthalmic lenses on a spectacle frame selected by a wearer. This assembly is broken down into three main operations:
  • the measurement of the shape of the inner contours of the circles of the mount,
  • the centering of each lens which consists of positioning and orienting each lens correctly facing each eye of the wearer, then
  • the machining of each lens which consists of cutting or contouring its contour to the desired shape, taking into account the measurements made on the frame and defined centering parameters.

Dans le cadre de la présente invention, on s'intéresse plus particulièrement à la troisième opération dite d'usinage. Il s'agit concrètement pour l'opticien de détourer la lentille ophtalmique de manière à ce qu'elle puisse mécaniquement et esthétiquement s'adapter à la forme du cercle correspondant de la monture sélectionnée, tout en assurant au mieux la fonction optique pour laquelle elle a été conçue.In the context of the present invention, we are more particularly interested in the third operation known as machining. This is specifically for the optician to cut the ophthalmic lens so that it can mechanically and aesthetically adapt to the shape of the corresponding circle of the selected frame, while ensuring the best optical function for which it was conceived.

Cette opération d'usinage comprend, dans le cas des montures cerclées, une étape de biseautage permettant de former sur la tranche de la lentille une nervure communément appelée biseau apte à s'emboîter dans un drageoir du cercle de la monture, c'est-à-dire dans la rainure qui court le long de la face intérieure du cercle.This machining operation includes, in the case of rimmed frames, a beveling step for forming on the edge of the lens a rib commonly called bevel able to fit into a bezel of the rim of the frame, that is, ie in the groove running along the inner face of the circle.

Pour des raisons esthétiques, le biseau est généralement réalisé à proximité de la face avant de la lentille, de sorte qu'il est bordé de son côté arrière par la partie restante du chant de la lentille qui présente une largeur souvent importante et qui est communément appelée pied arrière de biseau. protection des yeux contre les rayonnements, les montures fortement cambrées enveloppant les visages des porteurs connaissent un succès grandissant. Les cercles de ce type de montures fortement cambrées sont alors vrillés, notamment dans leurs zones temporales, afin de s'adapter aux formes des lentilles.For aesthetic reasons, the bevel is generally made close to the front face of the lens, so that it is bordered on its rear side by the remaining part of the edge of the lens which has a width that is often large and which is commonly called back bevel foot. protection of the eyes against radiation, the strongly arched frames enveloping the faces of the carriers are experiencing a growing success. The circles of this type of strongly arched frames are then twisted, especially in their temporal zones, to adapt to the shapes of the lenses.

L'emboîtement de la lentille dans le cercle correspondant de la monture est réalisé en amenant la lentille par l'avant de la monture et en l'insérant par pression dans le cercle pour engager le biseau de la lentille dans le drageoir du cercle de la monture. Or, contrairement à la face intérieure des cercles des montures, le pied arrière de biseau s'étend selon une surface cylindrique. En conséquence, lors de cet emboîtement, des interférences mécaniques apparaissent souvent entre le cercle de la monture et le pied arrière de biseau de la lentille, empêchant ainsi la lentille d'être insérée dans son cercle.The interlocking of the lens in the corresponding circle of the frame is achieved by bringing the lens through the front of the frame and inserting it by pressing into the circle to engage the bevel of the lens in the bezel of the circle of the mount. However, unlike the inner face of the frame circles, the rear bevel foot extends along a cylindrical surface. As a result, during this interlocking, mechanical interferences often appear between the frame of the frame and the rear bevel foot of the lens, thus preventing the lens from being inserted into its circle.

Actuellement, en présence de telles interférences, l'opticien procède à une reprise de l'ensemble de la tranche de la lentille ophtalmique, en réduisant son rayon, de manière à usiner en particulier les zones de conflit précitées.Currently, in the presence of such interference, the optician proceeds to a recovery of the entire portion of the ophthalmic lens, reducing its radius, so as to machine in particular the aforementioned conflict zones.

L'inconvénient majeur d'un tel procédé est que cette étape de reprise suppose, outre l'usinage du pied arrière de biseau, l'usinage du biseau lui-même. De ce fait, la position du biseau n'est, suite à cette reprise, plus optimale, si bien que le maintien de la lentille dans le cercle de la monture est mal assuré. En outre, pour ne pas usiner plus que nécessaire la lentille, l'opticien est contraint de procéder à de multiples retouches et essais d'emboîtement, si bien que le temps nécessaire à cette étape de reprise est important.The major disadvantage of such a method is that this recovery step supposes, besides the machining of the rear bevel foot, the machining of the bevel itself. Therefore, the position of the bevel is, following this recovery, more optimal, so that the maintenance of the lens in the frame of the frame is poorly secured. In addition, not to machine more than necessary the lens, the optician is forced to make multiple retouching and nesting tests, so that the time required for this step of recovery is important.

On connaît par ailleurs du document US 2006/0240747 un dispositif et un procédé de détourage de lentilles ophtalmiques permettant de réduire ces phénomènes d'interférence.It is also known from the document US 2006/0240747 an ophthalmic lens trimming device and method for reducing such interference phenomena.

Le dispositif comporte un châssis un porte-lentille et deux outils d'usinage de la lentille disposés de part et d'autre de cette lentille. Il comporte également des moyens d'actionnement de chaque outil d'usinage, dont une première vis sans fin pour permettre à l'outil de se translater parallèlement à l'axe de blocage de la lentille une seconde vis sans fin pour permettre à l'outil de se translater radialement par rapport à cet axe de blocage et un moteur pour permettre à l'outil de pivoter par rapport à l'axe de blocage de la lentilleThe device comprises a frame a lens holder and two lens machining tools arranged on either side of this lens. It also comprises means for actuating each machining tool, including a first worm to allow the tool to translate parallel to the locking axis of the lens a second worm to allow the tool to radially translate relative to this locking pin and a motor to allow the tool to pivot relative to the axis of locking of the lens

Le procédé décrit comporte suant à lui une première étape de_ biseautage de la lentille au cours de laquelle les deux flancs du biseau sont respectivement usinés par les deux outils d'usinage. Il comporte également une_ seconde étape d'usinage des pieds de biseau au cours de laquelle les pieds avant et arrière de biseau sont usinés de manière inclinée par rapport à l'axe de blocage de la lentille ce qui facilite l'emboîtement ultérieur de la lentille dans son cercle. If comporte enfin une troisième étape de chanfreinage des arêtes périphériques avant et arrière de la lentille,The method described comprises sweating a first step of beveling the lens during which the two sides of the bevel are respectively machined by the two machining tools. It also comprises a second step of machining the bevel feet during which the front and rear bevel feet are machined in an inclined manner with respect to the locking pin. of the lens which facilitates the subsequent interlocking of the lens in its circle. If finally has a third step of chamfering the peripheral edges front and rear of the lens,

Dans ce document, le pilotage de la position relative des outils d'usinage par rapport à la lentille doit nécessairement être réalisé numériquement et avec une grande précision, au détriment du coût du dispositif d'usinage Le nombre de degrés de liberté nécessaires au bon fonctionnement des outils d'usinage se fait par ailleurs au détriment de la fiabilité du dispositif d'usinage.In this document, the control of the relative position of the machining tools relative to the lens must necessarily be performed numerically and with great precision, to the detriment of the cost of the machining device The number of degrees of freedom required for proper operation machining tools is also at the expense of the reliability of the machining device.

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

Afin de remédier aux inconvénients précités de l'état de la technique, la présente invention propose un dispositif et un procédé fiables et peu onéreux, permettant de réduire les zones de conflit sans dégrader la qualité du maintien de la lentille dans son cercle.In order to overcome the aforementioned drawbacks of the state of the art, the present invention proposes a device and a reliable and inexpensive method, to reduce the conflict zones without degrading the quality of the maintenance of the lens in its circle.

Plus particulièrement, on propose selon l'invention un procédé de détourage d'une lentille ophtalmique selon la revendication 1.More particularly, it is proposed according to the invention a method of trimming an ophthalmic lens according to claim 1.

On propose également un dispositif de reprise du détourage d'une lentille selon la revendication 7.There is also provided a device for recovering the clipping of a lens according to claim 7.

Puisque la génératrice de travail de l'outil d'usinage est inclinée par rapport à l'axe de blocage de la lentille, le pied de biseau issu de la reprise de détourage s'étend selon une surface quasi-conique de forme proche de celle de la face intérieure du cercle correspondant de la monture. En conséquence, cette reprise permet de raboter les zones de conflit qui empêchaient l'insertion de la lentille dans son cercle.Since the working generator of the machining tool is inclined relative to the locking axis of the lens, the bevel foot resulting from the clipping recovery extends in a quasi-conical surface of shape close to that the inner face of the corresponding circle of the mount. As a result, this recovery makes it possible to plane the zones of conflict which prevented the insertion of the lens in its circle.

En outre, la mobilité axiale de la lentille et les premiers moyens de butée permettent de maintenir mécaniquement le seul pied arrière de la lentille ophtalmique en regard de l'outil d'usinage. De cette manière, seul le pied arrière de biseau est usiné par l'outil. Le biseau est donc laissé intact, si bien que la qualité du maintien de la lentille dans la monture reste inchangée.In addition, the axial mobility of the lens and the first abutment means can mechanically maintain the only rear foot of the ophthalmic lens facing the machining tool. In this way, only the rear bevel foot is machined by the tool. The bevel is left intact, so that the quality of the maintenance of the lens in the frame remains unchanged.

Les premiers moyens de butée rigides étant fixes relativement à l'outil d'usinage, ils permettent de guider la tranche de la lentille lorsque celle-ci pivote, de manière que le seul pied arrière de biseau reste en regard de la surface de travail de l'outil d'usinage.The first rigid abutment means being fixed relative to the machining tool, they allow to guide the edge of the lens when the latter rotates, so that the only rear foot of bevel remains facing the work surface of the machining tool.

Une première caractéristique avantageuse du procédé de détourage conforme à l'invention, est mentionnée dans la revendication 2.A first advantageous characteristic of the trimming method according to the invention is mentioned in claim 2.

Ici, les premiers moyens de butée sont élastiques et forment des moyens de rappel de la lentille au contact de l'outil. La mobilité axiale de la lentille et le rappel des moyens de blocage et d'entraînement en rotation de la lentille permettent alors de maintenir mécaniquement une butée liée à l'outil d'usinage au contact du flanc arrière du biseau. L'outil d'usinage est alors guidé mécaniquement par le biseau pour usiner le seul pied arrière de biseau.Here, the first abutment means are elastic and form means for returning the lens in contact with the tool. The axial mobility of the lens and the return of the locking means and rotational drive of the lens then allow to mechanically maintain a stop connected to the machining tool in contact with the rear flank of the bevel. The machining tool is then guided mechanically by the bevel to machine the only rear foot of bevel.

Avantageusement, au cours de l'étape de reprise, l'inclinaison de la génératrice de travail par rapport à l'axe de blocage reste constante et comprise entre 5 et 40 degrés, préférentiellement égale à 12 degrés, ou varie pour atteindre une valeur maximum comprise dans cet intervalle de valeurs. En outre, ladite étape de reprise comprend l'usinage de la totalité de la surface du pied arrière de biseau.Advantageously, during the recovery step, the inclination of the working generatrix with respect to the locking axis remains constant and between 5 and 40 degrees, preferably equal to 12 degrees, or varies to reach a maximum value. within this range of values. In addition, said recovery step comprises machining the entire surface of the rear bevel foot.

Ainsi, la reprise de la tranche de la lentille est réalisée de manière uniforme et esthétique.Thus, the recovery of the edge of the lens is performed uniformly and aesthetically.

D'autres caractéristiques avantageuses et non limitatives du procédé de détourage conforme à l'invention sont mentionnées dans les revendications 4 à 6.Other advantageous and non-limiting features of the trimming method according to the invention are mentioned in claims 4 to 6.

Par ailleurs, d'autres caractéristiques avantageuses et non limitatives du dispositif de reprise de détourage conforme à l'invention sont mentionnées dans les revendications 8 à 15.Furthermore, other advantageous and non-limiting features of the clipping recovery device according to the invention are mentioned in claims 8 to 15.

DESCRIPTION DÉTAILLÉE D'UN EXEMPLE DE RÉALISATIONDETAILED DESCRIPTION OF AN EXEMPLARY EMBODIMENT

La description qui va suivre, en regard des dessins annexés, donnée à titre d'exemple non limitatif, fera bien comprendre en quoi consiste l'invention et comment elle peut être réalisée.The description which follows, with reference to the accompanying drawings, given by way of non-limiting example, will make it clear what the invention consists of and how it can be achieved.

Sur les dessins annexés :

  • les figures 1 et 2 sont des vues en perspective, sous deux angles différents, d'un dispositif de reprise de détourage de lentilles ophtalmiques selon l'invention;
  • les figures 3 et 4 sont des vues en coupe partielle de deux variantes de réalisation d'un outil d'usinage du dispositif de reprise de la figure 1, et d'une lentille ophtalmique en cours d'usinage bloquée sur un porte-lentille ;
  • les figures 5 et 6 sont des vues en coupe de la tranche de deux lentilles ophtalmiques emboîtées dans des drageoirs de montures de lunettes et issues de deux variantes de mise en oeuvre d'un procédé de détourage selon l'invention.
In the accompanying drawings:
  • the figures 1 and 2 are perspective views, from two different angles, of a device for recovering ophthalmic lens trimming according to the invention;
  • the Figures 3 and 4 are partial sectional views of two variants of a machining tool of the recovery device of the figure 1 , and an ophthalmic lens being machined locked on a lens holder;
  • the Figures 5 and 6 are sectional views of the edge of two ophthalmic lenses fitted into bezels of eyeglass frames and issued from two variants of implementation of a clipping method according to the invention.

Dispositif de repriseRecovery device

Sur les figures 1 et 2, on a représenté schématiquement un dispositif de reprise 1 du détourage de lentilles ophtalmiques 100, tel qu'il se présente à son utilisateur.On the figures 1 and 2 Diagrammatically, a recovery device 1 of the ophthalmic lens trimming 100, as it is presented to its user.

Ce dispositif de reprise 1 est destiné à usiner une partie de la tranche d'une lentille ophtalmique 100 préalablement biseautée, de manière que cette lentille soit montable dans l'un des cercles de la monture de lunettes choisie par le futur porteur de cette lentille.This recovery device 1 is intended to machine a portion of the edge of an ophthalmic lens 100 previously bevelled, so that this lens is mountable in one of the circles of the eyeglass frame chosen by the future carrier of this lens.

On entend par lentille biseautée une lentille dont le contour a été découpé pour, d'une part, présenter une forme identique au contour du cercle correspondant de la monture, et, d'autre part, comporter le long de sa tranche un biseau. Par biseau, on entend bien sûr les nervures d'emboîtement classiques de sections triangulaires telles que celles représentées sur les figures 5 et 6, mais aussi celles envisageables de sections de formes différentes, par exemple rectangulaires ou arrondies. Ici, le biseau 101 présente un flanc avant 106 tourné du côté de la face optique avant 104 de la lentille ophtalmique 100 et un flanc arrière 103 tourné du côté opposé. Ce biseau 101 est en outre bordé, au moins du côté de son flanc arrière 103, d'un pied arrière de biseau 102 initialement cylindrique.The term "beveled lens" is understood to mean a lens whose contour has been cut in order, on the one hand, to have a shape identical to the contour of the corresponding circle of the frame, and, on the other hand, to have a bevel along its edge. By bevel, we mean of course the conventional interlocking ribs of triangular sections such as those shown on the Figures 5 and 6 but also those conceivable sections of different shapes, for example rectangular or rounded. Here, the bevel 101 has a leading edge 106 turned on the side of the optical front face 104 of the ophthalmic lens 100 and a rear flank 103 turned on the opposite side. This bevel 101 is further bordered, at least on the side of its rear flank 103, a rear foot 102 bevel initially cylindrical.

Le biseau 101 de la lentille ophtalmique 100 est quoi qu'il en soit conformé pour s'emboîter dans un drageoir 111 du cercle 110 de la monture, c'est-à-dire dans une rainure qui court le long de la face intérieure du cercle 110. Telle que représentée sur les figures 5 et 6, cette rainure présente une section de forme triangulaire. En variante, elle pourra également présenter une section de forme différente, par exemple rectangulaire ou arrondie. La face intérieure du cercle 110 comporte en outre, de part et d'autre du drageoir 111, un rebord avant 113 et un rebord arrière 112.The bevel 101 of the ophthalmic lens 100 is anyway shaped to fit into a bezel 111 of the frame 110 of the frame, that is to say in a groove running along the inner face of the circle 110. As represented on the Figures 5 and 6 this groove has a triangular section. Alternatively, it may also have a section of different shape, for example rectangular or rounded. The inner face of the circle 110 further comprises, on either side of the bezel 111, a front rim 113 and a trailing edge 112.

Le dispositif de reprise 1 est plus particulièrement prévu pour usiner le pied arrière de biseau 102 de la lentille ophtalmique 100 afin d'éviter, lors de l'emboîtement de la lentille ophtalmique 100 dans son cercle 110, tout contact entre le pied arrière de biseau 102 et le rebord arrière 112 de la face intérieure du cercle 110.The recovery device 1 is more particularly intended for machining the rear bevel foot 102 of the ophthalmic lens 100 in order to avoid, during the engagement of the ophthalmic lens 100 in its circle 110, any contact between the rear bevel foot 102 and the trailing edge 112 of the inner face of the circle 110.

Comme le montrent les figures 1 et 2, ce dispositif de reprise 1 comporte principalement un châssis 2 sur lequel sont montés un outil d'usinage 7 et un porte-lentille 10.As shown by figures 1 and 2 , this recovery device 1 mainly comprises a frame 2 on which are mounted a machining tool 7 and a lens holder 10.

Le porte-lentille 10 est relié au châssis par des moyens de liaison mécanique permettant une variation de l'écartement entre le porte-lentille 10 et l'outil d'usinage 7.The lens holder 10 is connected to the frame by mechanical connection means allowing a variation of the spacing between the lens holder 10 and the machining tool 7.

Dans l'exemple illustré, le porte-lentille comporte un socle qui forme une bascule montée librement pivotante sur le châssis 2 autour d'un axe A5 horizontal, appelé axe de bascule. A cet effet, la bascule 14 présente un alésage traversant qui est engagé sur un arbre 3 solidaire du châssis.In the illustrated example, the lens holder comprises a base which forms a rocker freely pivotally mounted on the frame 2 about a horizontal axis A5, called the rocker axis. For this purpose, the rocker 14 has a through bore which is engaged on a shaft 3 secured to the frame.

La bascule 14 est en outre montée libre en translation sur l'arbre 3 suivant l'axe de bascule A5 entre deux positions de butée, dont une position de butée droite et une position de butée gauche.The flip-flop 14 is also freely mounted in translation on the shaft 3 along the flip-flop axis A5 between two abutment positions, including a right abutment position and a left abutment position.

Le porte-lentille 10 comporte en outre des moyens de rappel de la bascule 14 en position de butée droite, constitués par un ressort de compression 4 engagé sur l'arbre 3, en compression entre la bascule 14 et une partie du châssis 2.The lens holder 10 further comprises biasing means of the rocker 14 in the right stop position, constituted by a compression spring 4 engaged on the shaft 3, in compression between the rocker 14 and a portion of the frame 2.

Le porte-lentille 10 est équipé de moyens de rappel transversal pour rappeler en cours d'usinage le porte-lentille 10 vers l'outil d'usinage 7 et maintenir ainsi la tranche de la lentille au contact de la surface de travail de l'outil d'usinage 7. Ces moyens de rappel sont ici gravitationnels, c'est-à-dire qu'ils résultent du seul poids de la bascule 14. A cet effet, le centre de gravité de la bascule 14 est situé à distance de l'axe de bascule A5 et la bascule 14 est lestée de manière que son poids lui permette de naturellement pivoter autour de l'axe de bascule A5, en direction de l'outil d'usinage 7. En variante, ces moyens de rappel transversal pourront être élastiques (du type ressort de torsion), électro-mécaniques, ou encore électro-magnétiques.The lens holder 10 is equipped with transverse return means for reminding the lens holder 10 during machining towards the machining tool 7 and thus keeping the edge of the lens in contact with the working surface of the lens. machining tool 7. These return means are here gravitational, that is to say that they result from the sole weight of the rocker 14. For this purpose, the center of gravity of the latch 14 is located at a distance of the rocker axis A5 and the rocker 14 is weighted so that its weight allows it to naturally rotate around the rocker axis A5, towards the machining tool 7. Alternatively, these transverse biasing means may be elastic (torsion spring type), electro-mechanical, or electro-magnetic.

Le porte-lentille 10 est enfin équipé de moyens de blocage et d'entraînement en rotation de la lentille ophtalmique 100. Ces moyens comportent deux arbres 11 de blocage de la lentille, alignés l'un avec l'autre selon un axe A1 appelé axe de blocage, qui est parallèle à et distinct de l'axe de bascule A5. Dans la suite de la description, les termes axial et transversal seront utilisés en référence à la position de cet axe de blocage A1.The lens holder 10 is finally equipped with locking means and rotational drive of the ophthalmic lens 100. These means comprise two shafts 11 for blocking the lens, aligned with each other along an axis A1 called axis blocking, which is parallel to and distinct from the flip-flop axis A5. In the remainder of the description, the terms axial and transverse will be used with reference to the position of this locking pin A1.

Les deux arbres 11 sont montés sur la bascule 14 pour tourner autour de l'axe de blocage A1 et sont entraînés en rotation de façon synchrone par un moteur (non représenté) via un mécanisme d'entraînement commun (non représenté) embarqué dans la bascule 14. En variante, on pourra prévoir d'entraîner les deux arbres par deux moteurs distincts synchronisés mécaniquement ou électroniquement. On pourra également prévoir des moyens d'entraînement manuel des deux arbres en rotation.The two shafts 11 are mounted on the rocker 14 to turn around the locking pin A1 and are rotated synchronously by a motor (not shown) via a common drive mechanism (not shown) embedded in the latch 14. Alternatively, it can be provided to drive the two shafts by two separate motors synchronized mechanically or electronically. It will also be possible to provide manual drive means for the two shafts in rotation.

Chacun des arbres 11 possède une extrémité libre qui fait face à l'extrémité libre de l'autre arbre et qui est équipée d'un nez de blocage 12 de la lentille ophtalmique 100. Les deux nez de blocage 12 sont globalement de révolution autour de l'axe de blocage A1 et présentent chacun une face d'application globalement transversale agencée pour prendre appui contre la face optique correspondante de la lentille ophtalmique 100.Each of the shafts 11 has a free end which faces the free end of the other shaft and which is equipped with a locking nose 12 of the ophthalmic lens 100. The two locking noses 12 are generally of revolution around each other. the locking pin A1 and each have a generally transverse application face arranged to bear against the corresponding optical face of the ophthalmic lens 100.

Les deux arbres 11 sont mobiles en translation suivant l'axe de blocage A1 pour réaliser le serrage en compression axiale de la lentille ophtalmique 100 entre les deux nez de blocage 12. Ces translations sont ici commandées manuellement à l'aide de molettes 13 disposées de part et d'autre de la bascule 14, dans l'axe des arbres 11, pour être accessibles à l'utilisateur. Ces molettes sont ici liées à des vis sans fin vissées dans des alésages taraudés des arbres 11, de sorte que le pivotement des molettes 13 permet de rapprocher les deux arbres 11 l'un de l'autre pour bloquer rigidement la lentille ophtalmique 100. Bien sûr, en variante, ces translations axiales des arbres 11 pourront être commandées autrement, par exemple par des moteurs d'entraînement ad hoc logés dans la bascule. En variante encore, on pourra prévoir qu'un seul de ces deux arbres soit mobile en translation.The two shafts 11 are movable in translation along the blocking axis A1 to effect the compression in axial compression of the ophthalmic lens 100 between the two locking noses 12. These translations are here manually controlled by means of rollers 13 arranged with either side of the rocker 14, in the axis of the shafts 11, to be accessible to the user. These knobs are here linked to worms screwed into threaded bores of the shafts 11, so that the pivoting of the knobs 13 brings the two shafts 11 closer to one another to rigidly block the ophthalmic lens 100. of course, these axial translations of the shafts 11 may be controlled otherwise, for example by ad hoc drive motors housed in the latch. In another variant, it may be provided that only one of these two trees is movable in translation.

L'outil d'usinage est en l'espèce constitué par une meule 7 montée rotative autour d'un axe de rotation A3. En variante, l'outil d'usinage pourra être constitué par une fraise ou un couteau montés rotatifs autour de l'axe de rotation A3.The machining tool is in this case constituted by a grinding wheel 7 rotatably mounted about an axis of rotation A3. Alternatively, the machining tool may be constituted by a cutter or a knife rotatably mounted about the axis of rotation A3.

On définit sur cet outil d'usinage une génératrice de travail A6 (figure 3) comme étant l'axe qui est coplanaire avec l'axe de rotation A3, qui appartient ou qui est tangent à la surface de travail de l'outil d'usinage et qui est le plus proche des arbres 11 de blocage de la lentille ophtalmique 100. En d'autres termes, lorsque la tranche de la lentille est au contact de l'outil d'usinage, cette génératrice de travail correspond à la ligne de contact entre l'outil d'usinage et la lentille. Bien sûr, si l'outil est une fraise ou un couteau, ce contact n'est pas continu mais plutôt périodique.A machining tool A6 is defined on this machining tool ( figure 3 ) as being the axis which is coplanar with the axis of rotation A3, which belongs to or is tangent to the working surface of the machining tool and which is closest to the ophthalmic lens locking shafts 11 In other words, when the edge of the lens is in contact with the machining tool, this generating work corresponds to the line of contact between the machining tool and the lens. Of course, if the tool is a cutter or a knife, this contact is not continuous but rather periodic.

La meule 7 est ici cylindrique de révolution et est entraînée en rotation autour de l'axe de rotation A3 par un moteur électrique 8 dont le corps est fixé au châssis 2 et dont l'arbre de sortie porte directement la meule. Le moteur 8 est monté sur le châssis de manière à ce que l'axe de rotation A3 soit incliné d'un angle ALPHA par rapport à l'axe de blocage A1. En conséquence, la génératrice de travail A6 de la meule 7 est inclinée du même angle par rapport à l'axe de blocage A1. Du fait de cette inclinaison, la meule 7 est adaptée à usiner la tranche de la lentille ophtalmique 100 en « cassant » son arête arrière et en conférant à son pied arrière de biseau 102 une forme quasi-conique, c'est-à-dire une forme approchée à celle d'un cône.The grinding wheel 7 is here cylindrical of revolution and is rotated about the axis of rotation A3 by an electric motor 8 whose body is fixed to the frame 2 and whose output shaft directly carries the grinding wheel. The motor 8 is mounted on the frame so that the axis of rotation A3 is inclined at an angle ALPHA with respect to the locking pin A1. As a result, the work generator A6 of the grinding wheel 7 is inclined at the same angle with respect to the locking pin A1. Due to this inclination, the grinding wheel 7 is adapted to machine the edge of the ophthalmic lens 100 by "breaking" its rear edge and conferring on its rear foot 102 bevel a quasi-conical shape, that is to say a shape approximated to that of a cone.

L'angle d'inclinaison ALPHA de cette génératrice de travail A6 par rapport à l'axe de blocage A1 est préférentiellement compris entre 5 et 40 degrés. Il est ici égal à 12 degrés.The angle of inclination ALPHA of this work generator A6 with respect to the blocking axis A1 is preferably between 5 and 40 degrees. It is here equal to 12 degrees.

En variante, on pourra prévoir que l'axe de rotation de la meule soit parallèle à l'axe de blocage de la lentille et que la meule soit conique de révolution autour de son axe de rotation, de sorte que sa génératrice de travail soit inclinée par rapport à l'axe de blocage A1. Selon une autre variante, on pourra prévoir que l'axe de rotation de la meule soit incliné par rapport à l'axe de blocage de la lentille et que la meule soit conique de révolution autour de son axe de rotation, de sorte que sa génératrice de travail soit inclinée par rapport à l'axe de blocage A1. En variante encore, l'outil d'usinage pourra comporter un train de meules, avec en particulier une meule de biseautage, de manière que le dispositif de reprise soit apte à détourer et à reprendre les lentilles ophtalmiques de contours initialement circulaires (lentilles semi-finies).Alternatively, it may be provided that the axis of rotation of the grinding wheel is parallel to the locking axis of the lens and that the grinding wheel is conical of revolution about its axis of rotation, so that its work generator is inclined relative to the locking pin A1. According to another variant, it may be provided that the axis of rotation of the grinding wheel is inclined relative to the locking axis of the lens and that the grinding wheel is conical of revolution about its axis of rotation, so that its generator working angle is inclined relative to the blocking axis A1. As a further variant, the machining tool may comprise a set of grinding wheels, with in particular a beveling grinding wheel, in such a way that the recovery device is able to cut out and take back the ophthalmic lenses of initially circular contours (semi-circular lenses). finite).

Quoi qu'il en soit, il est prévu des moyens d'humidification de la meule qui sont ici constitués par une éponge 6 fixée au châssis 2 et située sous la meule 7, au contact de sa surface de travail.Anyway, it is provided means for moistening the grinding wheel which are constituted by a sponge 6 fixed to the frame 2 and located under the grinding wheel 7, in contact with its working surface.

Le dispositif de reprise 1 comporte par ailleurs des premiers moyens de butée axiale 30 rigides ou élastiques pour, en cours d'usinage, s'opposer au déplacement de la lentille ophtalmique 100 dans la direction opposée au point P1 qui est défini comme étant le point de l'axe de blocage A1 qui est le plus proche de la génératrice de travail A6 (figure 3).The recovery device 1 furthermore comprises first rigid or elastic axial abutment means 30 for, during machining, opposing the displacement of the ophthalmic lens 100 in the direction opposite to the point P1 which is defined as the point blocking pin A1 which is closest to the work generator A6 ( figure 3 ).

Selon un premier mode de réalisation de l'invention, représenté sur les figures 1 et 2, les premiers moyens de butée axiale 30 sont rigides et sont conformés pour former une butée mécanique réglable axialement par rapport à la meule 7, suivant l'axe de blocage A1. Cette butée mécanique est plus précisément agencée pour que la périphérie de la face avant 104 de la lentille ophtalmique 100 puisse venir en appui contre elle.According to a first embodiment of the invention, represented on the figures 1 and 2 , the first axial stop means 30 are rigid and are shaped to form a mechanical stop axially adjustable relative to the grinding wheel 7, along the blocking axis A1. This mechanical stop is more precisely arranged so that the periphery of the front face 104 of the ophthalmic lens 100 can bear against it.

En l'espèce, la lentille étant naturellement rappelée vers sa position de butée droite par le ressort de compression 4, il est prévu que la lentille reste constamment en appui contre ces premiers moyens de butée axiale 30.In the present case, the lens being naturally returned to its right abutment position by the compression spring 4, it is provided that the lens is constantly resting against these first axial abutment means 30.

Les premiers moyens de butée axiale 30 sont ici montés sur une platine 20 pourvue d'une unique mobilité de pivotement par rapport au châssis 2 autour d'un axe A2, appelé axe de pivotement, parallèle à l'axe de bascule A5. A cet effet, la platine 20 comporte une plaque 21 rectangulaire dont l'un des bords est pourvu d'un manchon traversé par un arbre 5 qui est fixé sur le châssis 2, en dessous de l'arbre 3 et parallèlement à celui-ci. Le manchon 22 est bloqué en translation sur cet arbre 5, par exemple au moyen de circlips. De cette manière, la platine 20 peut pivoter autour de l'axe de pivotement A2 pour se lever en direction du porte-lentille 10 ou pour s'abaisser vers la meule 7. La plaque 21 est ajourée pour permettre, en position abaissée, le passage de la meule 7 au travers de ladite plaque, afin qu'elle puisse exercer sa fonction d'usinage.The first axial abutment means 30 are here mounted on a plate 20 provided with a single pivotal mobility relative to the frame 2 about an axis A2, called the pivot axis, parallel to the flip-flop axis A5. For this purpose, the plate 20 comprises a rectangular plate 21, one of whose edges is provided with a sleeve traversed by a shaft 5 which is fixed on the frame 2, below the shaft 3 and parallel thereto . The sleeve 22 is locked in translation on this shaft 5, for example by means of circlips. In this way, the plate 20 can pivot about the pivot axis A2 to rise in the direction of the lens holder 10 or to lower towards the grinding wheel 7. The plate 21 is perforated to allow, in the lowered position, the passage of the grinding wheel 7 through said plate, so that it can perform its machining function.

Les premiers moyens de butée axiale 30 comportent un bras 31, formé ici par une tige métallique. Ce bras 31 est pourvu à mi-longueur d'un alésage engagé sur un pion de la platine 20, de manière qu'il est mobile en rotation relativement à cette platine 20 autour d'un axe de butée A4 normal au plan de la platine 20.The first axial abutment means 30 comprise an arm 31, formed here by a metal rod. This arm 31 is provided at mid-length with a bore engaged on a pin of the plate 20, so that it is rotatable relative to this plate 20 about an abutment axis A4 normal to the plane of the plate 20.

Ce bras est en outre prolongé par un avant-bras 32 pourvu à son extrémité libre d'une roulette 33 en nylon apte à venir rouler sur la face optique avant de la lentille, sans la rayer, lorsque la lentille pivote autour de l'axe de blocage A1.This arm is further extended by a forearm 32 provided at its free end with a nylon wheel 33 adapted to roll on the front optical side of the lens, without scratching it, when the lens pivots about the axis blocking A1.

L'avant-bras 32 est monté à rotation sur le bras 31 autour d'un axe parallèle à l'axe de butée A4. Un vernier de réglage 34 est agencé sur l'avant-bras 32 de manière que son pivotement permette de régler finement l'orientation de l'avant-bras 32 par rapport au bras 31. Une vis permet de bloquer la rotation de l'avant-bras par rapport au bras.The forearm 32 is rotatably mounted on the arm 31 about an axis parallel to the abutment axis A4. A vernier adjustment 34 is arranged on the forearm 32 so that its pivoting allows fine adjustment of the orientation of the forearm 32 relative to the arm 31. A screw can block the rotation of the front -arm relative to the arm.

Les premiers moyens de butée axiale 30 comportent en outre un levier 25 monté à rotation sur la platine 20 autour d'un axe parallèle à l'axe de butée A4. Ce levier 25 est pourvu d'une came apte à venir en appui contre l'extrémité du bras 31 opposée à l'avant-bras 32. Ce levier est prévu pour présenter deux positions stables, dont une position engagée dans laquelle la came est en appui transversal contre le bras et une position désengagée dans laquelle la came est en retrait par rapport au bras.The first axial abutment means 30 further comprise a lever 25 rotatably mounted on the plate 20 about an axis parallel to the abutment axis A4. This lever 25 is provided with a cam adapted to abut against the end of the arm 31 opposite to the forearm 32. This lever is provided to have two stable positions, including an engaged position in which the cam is in position. transverse support against the arm and a disengaged position in which the cam is set back from the arm.

En résumé, grâce au vernier 34 et au levier 25, les premiers moyens de butée axiale 30 sont réglables axialement pour modifier la position de la roulette 33 par rapport à la meule 7, en modifiant la position angulaire du bras 31 par rapport à la platine 20 (autour de l'axe de blocage A4) et de l'avant-bras 32 par rapport au bras 31. Plus précisément, l'association du vernier 34 et du levier 25 permet à l'utilisateur de régler finement la position de la roulette 33 et, partant, la position axiale de la tranche de la lentille par rapport à la meule.In summary, thanks to the vernier 34 and the lever 25, the first axial stop means 30 are axially adjustable to change the position of the wheel 33 relative to the grinding wheel 7, by changing the angular position of the arm 31 relative to the platen 20 (around the locking pin A4) and the forearm 32 relative to the arm 31. More specifically, the combination of the vernier 34 and the lever 25 allows the user to fine tune the position of the roulette 33 and hence the axial position of the edge of the lens relative to the grinding wheel.

Selon un deuxième mode de réalisation de l'invention, non représenté sur les figures mais qui sera décrit à l'aide des figures 1 à 3, les premiers moyens de butée axiale 30 pourront être élastiques, pour rappeler en cours d'usinage la lentille ophtalmique 100 bloquée dans les moyens de blocage et d'entraînement en rotation 11, 12 dans la direction du point P1.According to a second embodiment of the invention, not shown in the figures but which will be described using the Figures 1 to 3 , the first axial abutment means 30 may be elastic, to remind during machining ophthalmic lens 100 locked in the locking means and rotational drive 11, 12 in the direction of point P1.

En l'espèce, ces premiers moyens de butée axiale 30 élastiques sont agencés pour exercer un effort de rappel sur la face optique avant 104 de la lentille ophtalmique 100, selon un axe sensiblement parallèle à l'axe de blocage A1, de manière à maintenir le flanc arrière 103 du biseau 101 de la lentille ophtalmique 100 au contact de seconds moyens de butée 51 associés à l'outil d'usinage 7.In the present case, these first elastic axial abutment means 30 are arranged to exert a return force on the front optical face 104 of the ophthalmic lens 100, along an axis substantially parallel to the blocking axis A1, so as to maintain the trailing edge 103 of the bevel 101 of the ophthalmic lens 100 in contact with second abutment means 51 associated with the machining tool 7.

Ces premiers moyens de butée axiale 30 sont aptes à exercer un effort de rappel sur la lentille d'intensité inférieure à l'intensité de l'effort exercé par les moyens de rappel transversal de la bascule 14 sur la lentille. Par conséquent, lorsque la lentille est entraînée en rotation autour de l'axe de blocage A1 et est rappelée au contact de la meule par les moyens de rappel transversal, le contact du flanc arrière 103 du biseau 101 contre les seconds moyens de butée 51 permet de guider axialement la lentille par rapport à l'outil d'usinage, de manière que la surface de travail de la meule 7 reste au contact du pied arrière de biseau 102.These first axial abutment means 30 are able to exert a return force on the lens of intensity less than the intensity of the force exerted by the transverse biasing means of the latch 14 on the lens. Therefore, when the lens is rotated about the locking pin A1 and is brought into contact with the grinding wheel by the transverse return means, the contact of the rear flank 103 of the bevel 101 against the second stop means 51 allows axially guiding the lens relative to the machining tool, so that the working surface of the grinding wheel 7 remains in contact with the rear bevel foot 102.

Dans l'exemple illustré par la figure 3, les seconds moyens de butée sont formés par un flanc 51 de l'outil d'usinage 7. Ainsi, les premiers moyens de butée axiale 30 élastiques permettent de plaquer le flanc arrière 103 du biseau 101 de la lentille 100 directement contre ce flanc 51 de la meule 7. Éventuellement, on pourra prévoir que le flanc 51 concerné de la meule 7 ne soit pas abrasif afin de s'assurer que la meule glisse sans effort d'enlèvement de matière contre le flanc arrière 103 du biseau 101.In the example illustrated by the figure 3 , the second abutment means are formed by a flank 51 of the machining tool 7. Thus, the first elastic axial abutment means 30 allow the rear flank 103 of the bevel 101 of the lens 100 to be pressed directly against this flank 51 7. Optionally, it can be provided that the flank 51 of the grinding wheel 7 is not abrasive to ensure that the grinding wheel slides without effort of removal of material against the rear flank 103 of the bevel 101.

En variante, lesdits seconds moyens de butée pourront être formés par un organe supplémentaire distinct de la meule. Par exemple, comme le montre la figure 4, cet organe supplémentaire 50 pourra être constitué par un disque rigide monté libre en rotation sur l'arbre de la meule 7, à distance de celle-ci. Ainsi le disque rigide ne tourne-t-il pas contre la lentille ophtalmique 100, de manière qu'il préserve l'intégrité géométrique du biseau 101. En variante encore, cet organe supplémentaire pourra être directement fixé au châssis 2, dans une position fixe par rapport à la meule 7.Alternatively, said second abutment means may be formed by an additional member separate from the grinding wheel. For example, as shown in figure 4 this additional member 50 may be constituted by a rigid disk mounted free to rotate on the shaft of the grinding wheel 7, at a distance from the latter. Thus the rigid disk does not turn against the ophthalmic lens 100, so that it preserves the geometric integrity of the bevel 101. As a variant, this additional member may be directly attached to the frame 2, in a fixed position relative to the grinding wheel 7.

Quel que soit le mode de réalisation des premiers moyens de butée axiale 30, le dispositif de reprise 1 comporte une butée transversale de profondeur de passe 26 qui est réglable en hauteur par rapport à la meule 7, pour limiter la capacité de profondeur d'usinage de cette meule.Whatever the embodiment of the first axial abutment means 30, the recovery device 1 comprises a cross depth stop 26 which is adjustable in height relative to the grinding wheel 7, to limit the capacity of machining depth of this millstone.

Cette butée de profondeur de passe 26 est rapportée sur la platine 20, au-dessus d'une ouverture circulaire (non visible sur les figures) qui est réalisée dans la platine et par laquelle la meule 7 fait saillie. La butée est ici constituée par un capot 26 présentant une partie périphérique 27 plane qui est fixée par vis à la platine 20, et une partie centrale bombée 28 qui s'étend au-dessus de ladite ouverture circulaire. Cette partie centrale bombée 28 est ouverte par une fenêtre 29 rectangulaire conçue pour que seule une portion d'extrémité radiale de la meule 7 fasse saillie au-dessus de la platine 20. Ainsi, lorsque le porte-lentille 10 est ramené vers la meule par ses moyens de rappel transversal, la meule usine le pied arrière de biseau 102 sur une hauteur D1 (figure 5) prédéfinie, puis le sommet du biseau 101 de la lentille ophtalmique 100 vient au contact de la partie centrale bombée 28 du capot 26, ce qui limite le rapprochement de l'axe de blocage A1 vers la meule 7.This stop depth 26 pass is reported on the plate 20, above a circular opening (not visible in the figures) which is formed in the plate and by which the grinding wheel 7 protrudes. The stop is here constituted by a cover 26 having a flat peripheral portion 27 which is fixed by screw to the plate 20, and a curved central portion 28 which extends above said circular opening. This curved central portion 28 is opened by a rectangular window 29 designed so that only a radial end portion of the grinding wheel 7 protrudes above the plate 20. Thus, when the lens holder 10 is brought back to the grinding wheel by its transverse return means, the wheel mills the rear bevel foot 102 on a height D1 ( figure 5 ), then the top of the bevel 101 of the ophthalmic lens 100 comes into contact with the curved central portion 28 of the cover 26, which limits the approach of the locking pin A1 to the grinding wheel 7.

Cette butée de profondeur de passe 26 est réglable en hauteur en modifiant la position angulaire de la platine 20 autour de l'axe de pivotement A2. A cet effet, le châssis 2 comporte une molette de réglage 9 graduée angulairement qui est accessible à l'utilisateur et dont le réglage de la position angulaire permet de modifier la hauteur par rapport au châssis 2. Cette molette de réglage 9 est située sous la platine 20, au contact du bord d'extrémité de la platine 20 opposé à l'axe de pivotement A2. En correspondance, la platine 20 est percée d'un alésage taraudé accueillant une vis 24 dont la tête de manoeuvre est accessible à l'utilisateur et dont l'extrémité libre est en appui contre la face supérieure de la molette de réglage 9. L'association de cette vis 24 et de cette molette de réglage 9 permet alors à l'utilisateur de régler finement la position de la platine 20 autour de l'axe de pivotement A2 et, partant, la profondeur de la reprise.This depth stop 26 is adjustable in height by changing the angular position of the plate 20 about the pivot axis A2. For this purpose, the frame 2 comprises an adjustment knob 9 graduated angularly which is accessible to the user and whose adjustment of the angular position allows to change the height relative to the frame 2. This adjustment wheel 9 is located under the platen 20, in contact with the end edge of the plate 20 opposite the pivot axis A2. Correspondingly, the plate 20 is pierced with a threaded bore hosting a screw 24 whose operating head is accessible to the user and whose free end is supported against the upper face of the adjustment wheel 9. The association of this screw 24 and this adjustment wheel 9 then allows the user to fine tune the position of the plate 20 about the pivot axis A2 and hence the depth of recovery.

Enfin, le dispositif de reprise 1 comporte des moyens de pilotage 40 des moteurs d'actionnement de la meule 7 et des arbres 11 de blocage dé la lentille ophtalmique 100. Ces moyens de pilotage comportent ici deux interrupteurs 41, 42 qui permettent de mettre en marche ou d'arrêter chaque moteur.Finally, the recovery device 1 comprises control means 40 of the actuating motors of the grinding wheel 7 and the locking shafts 11 of the ophthalmic lens 100. These control means here comprise two switches 41, 42 which make it possible to start or stop each motor.

ProcédéProcess

Le procédé selon l'invention consiste à détourer la lentille ophtalmique 100 de manière que son biseau 101 soit facilement emboîtable dans le drageoir 111 du cercle 110 de la monture de lunettes sélectionnée par le porteur. Ce procédé comporte trois étapes principales successives, dont une première étape de biseautage de la lentille ophtalmique 100, une deuxième étape de blocage de cette lentille sur le porte-lentille 10 du dispositif de reprise 1, et une troisième étape de reprise du pied arrière de biseau 102 de cette lentille par la meule 7 du dispositif de reprise 1.The method according to the invention consists in cutting the ophthalmic lens 100 so that its bevel 101 is easily nestable in the bezel 111 of the circle 110 of the eyeglass frame selected by the wearer. This method comprises three successive main steps, including a first step of bevelling of the ophthalmic lens 100, a second step of blocking this lens on the lens holder 10 of the recovery device 1, and a third step of recovery of the back foot of bevel 102 of this lens by the grinding wheel 7 of the recovery device 1.

Pour la mise en oeuvre de la première étape dite de biseautage, on pourra utiliser un appareil de biseautage qui ne fait pas en propre l'objet de la présente invention. Un tel appareil de biseautage, bien connu de l'Homme du métier, est par exemple décrit dans le document US 6 327 790 ou commercialisé par la demanderesse sous la marque Kappa. Il comprend généralement des arbres de maintien et d'entraînement en rotation de la lentille ophtalmique à biseauter autour d'un premier axe, ainsi qu'une meule de biseautage qui est pourvue d'une gorge de biseautage et qui est montée rotative autour d'un deuxième axe sensiblement parallèle au premier axe.For the implementation of the first so-called beveling step, it will be possible to use a beveling apparatus which is not the subject of the present invention. Such a beveling apparatus, well known to those skilled in the art, is for example described in the document US 6,327,790 or marketed by the plaintiff under the trademark Kappa. It generally comprises shafts for holding and rotating the ophthalmic lens to bevel around a first axis, and a beveling wheel which is provided with a bevelling groove and which is rotatably mounted around a second axis substantially parallel to the first axis.

En résumé, au cours de cette étape, la lentille est bloquée sur les arbres de maintien puis est détourée par la meule de biseautage en faisant varier, pour chaque position angulaire de la lentille autour du premier axe, l'écartement entre le premier axe et le deuxième axe.In summary, during this step, the lens is locked on the holding shafts and then is cut off by the beveling wheel by varying, for each angular position of the lens around the first axis, the spacing between the first axis and the second axis.

La position axiale de la lentille par rapport à la gorge de biseautage est également pilotée. Pour des raisons esthétiques, ce pilotage axial est réalisé de manière que le biseau 101 s'étende à proximité de la face optique avant 104 de la lentille ophtalmique 100.The axial position of the lens relative to the beveling groove is also controlled. For aesthetic reasons, this axial control is carried out so that the bevel 101 extends close to the front optical face 104 of the ophthalmic lens 100.

Plus précisément, en référence à la figure 5, le biseau 101 est usiné au bord de la face optique avant 104 de la lentille, de manière qu'à l'issue de cette étape de biseautage, la tranche de la lentille soit dépourvue de pied avant de biseau et qu'elle comporte un pied arrière de biseau 102 cylindrique de largeur importante.More specifically, with reference to the figure 5 , the bevel 101 is machined at the edge of the optical front face 104 of the lens, so that at the end of this beveling step, the edge of the lens is devoid of foot before bevel and it comprises a 102 cylindrical bevel rear foot of large width.

En variante, en référence à la figure 6, le biseau 101 pourra être usiné à distance du bord de la face optique avant 104 de la lentille, de manière qu'à l'issue de cette étape de biseautage, la tranche de la lentille comporte, outre un pied arrière de biseau 102 cylindrique de largeur importante, un pied avant de biseau 105 cylindrique de largeur moindre.Alternatively, with reference to the figure 6 , the bevel 101 may be machined at a distance from the edge of the optical front face 104 of the lens, so that at the end of this beveling step, the edge of the lens comprises, besides a cylindrical bevel rear foot 102 of large width, a cylindrical bevel fore foot 105 of smaller width.

Quoi qu'il en soit, la lentille est ensuite extraite de l'appareil de détourage pour être emboîtée dans le cercle 110 de la monture de lunettes. Lors de cet emboîtement, si un problème dû à une interférence entre le pied arrière de biseau 102 de la lentille ophtalmique 100 et le rebord arrière 112 de la face intérieure du cercle 110 est détecté, on procède à la deuxième étape dite de blocage de la lentille ophtalmique 100 sur le porte-lentille 10.Anyway, the lens is then extracted from the clipping apparatus to be nested in the circle 110 of the eyeglass frame. During this interlocking, if a problem due to interference between the rear bevel foot 102 of the ophthalmic lens 100 and the trailing edge 112 of the inner face of the circle 110 is detected, the second step of the blocking of the ophthalmic lens 100 on the lens holder 10.

Un tel problème est généralement détecté sur les lentilles qui présentent de fortes cambrures et/ou des tranches d'épaisseurs importantes. Plus précisément, on entend par lentille à forte cambrure une lentille dont le rayon de courbure de la face optique avant est inférieur à 120 millimètres. On entend en outre par épaisseur importante une lentille dont l'épaisseur maximale de la tranche est supérieure à 7 millimètres.Such a problem is generally detected on lenses that have strong camber and / or slices of significant thickness. More precisely, the term "high-arched lens" means a lens whose radius of curvature of the front optical face is less than 120 millimeters. In addition, significant thickness is understood to mean a lens whose maximum thickness of the wafer is greater than 7 millimeters.

En variante, la détection d'un tel problème pourra être réalisée directement à l'issue du biseautage de la lentille, sans tentative d'emboîtement de la lentille dans la monture. Par exemple, il sera possible d'acquérir l'épaisseur de la tranche de la lentille et/ou sa cambrure, puis de comparer ces valeurs acquises avec des valeurs seuil prédéterminées au-delà desquelles le risque qu'un problème d'emboîtement apparaisse est grand.Alternatively, the detection of such a problem can be performed directly after the beveling of the lens, without attempting to nest the lens in the frame. For example, it will be possible to acquire the thickness of the slice of the lens and / or its camber, and then compare these acquired values with predetermined threshold values beyond which the risk that a nesting problem appears is great.

Quoi qu'il en soit, lorsqu'un tel problème est détecté, l'utilisateur soulève la bascule 14 en la faisant pivoter autour de l'axe de bascule A5, puis il procède au blocage de la lentille entre les deux arbres 11 du porte-lentille 10. Ces arbres 11, mobiles en translation suivant l'axe de blocage A1, sont actionnés au moyen des molettes 13 pour enserrer fermement la lentille ophtalmique 100 entre les faces d'application des nez de blocage 12. On notera ici que la position de la lentille par rapport à l'axe de blocage A1 n'a aucune importance. Il n'est en particulier pas nécessaire de centrer la lentille sur cet axe. Il est en revanche important de vérifier que les nez de blocage 12 ne débordent pas de la lentille.Anyway, when such a problem is detected, the user raises the rocker 14 by rotating it around the rocker axis A5, then it proceeds to lock the lens between the two shafts 11 of the door The shafts 11, movable in translation along the blocking axis A1, are actuated by means of the knurls 13 to firmly grip the ophthalmic lens 100 between the application faces of the locking noses 12. It will be noted here that the position of the lens relative to the blocking pin A1 does not matter. In particular, it is not necessary to center the lens on this axis. On the other hand, it is important to check that the locking noses 12 do not protrude from the lens.

Une fois ce blocage de la lentille effectuée, l'utilisateur actionne le levier 25 de manière à écarter la roulette 33 de la meule 7. Puis, il redescend la bascule 14 en positionnant le flanc arrière 103 du biseau 101 et le pied arrière de biseau 102 de la lentille ophtalmique 100 contre la meule 7. Enfin, il replace le levier 25 en position initiale de manière que les premiers moyens de butée axiale 30 maintiennent la lentille à proximité de la meule.Once this blocking of the lens has been performed, the user actuates the lever 25 so as to move the wheel 33 away from the grinding wheel 7. Then he descends the rocker 14 by positioning the rear flank 103 of the bevel 101 and the rear bevel foot 102 of the ophthalmic lens 100 against the grinding wheel 7. Finally, it returns the lever 25 to the initial position so that the first axial stop means 30 maintain the lens near the grinding wheel.

A l'aide du vernier 34, l'utilisateur ajuste la position de la lentille par rapport à la meule 7, en positionnant l'arrière du biseau à l'affleurement du flanc droit de la meule 7. En d'autre termes, il tourne le vernier de manière que seul le pied arrière de biseau de la lentille se trouve en regard de la surface de travail de la meule 7.Using the vernier 34, the user adjusts the position of the lens relative to the grinding wheel 7, positioning the rear of the bevel flush with the right flank of the grinding wheel 7. In other words, it turn the vernier so that only the rear bevel foot of the lens is facing the work surface of the grinding wheel 7.

A ce stade, le flanc arrière 103 du biseau 101 de la lentille ophtalmique 100 est maintenu en appui contre la tranche de la meule 7 par les premiers moyens de butée axiale 30 tandis que le pied arrière de biseau 102 de la lentille ophtalmique 100 est maintenu en appui contre la génératrice de travail A6 de l'outil d'usinage 7 par les moyens de rappel transversal (c'est-à-dire en l'espèce par le poids de la bascule 14).At this stage, the rear flank 103 of the bevel 101 of the ophthalmic lens 100 is held in abutment against the edge of the grinding wheel 7 by the first axial stop means 30 while the rear bevel foot 102 of the ophthalmic lens 100 is maintained. resting against the work generator A6 of the machining tool 7 by the transverse return means (that is to say in this case by the weight of the rocker 14).

Avant de procéder à la reprise de la lentille, l'utilisateur ajuste la profondeur de passe de la meule 7 en tournant la molette de réglage 9, de manière à placer la butée de profondeur de passe 26 à la hauteur souhaitée. On notera ici que la vis 24 ne sera utilisée qu'occasionnellement, afin d'étalonner le dispositif de reprise 1 de manière que les graduations marquées sur la molette de réglage 9 correspondent aux profondeurs de passe réelles, en millimètres. Pour cela, on réglera le « zéro » de la molette de réglage 9 en positionnant, à l'aide de la vis 24, l'ouverture 29 de la butée de profondeur de passe 26 à l'affleurement de la surface de travail de la meule 7.Before resuming the lens, the user adjusts the depth of the grinding wheel 7 by turning the adjustment wheel 9, so as to set the depth stop 26 to the desired height. It will be noted here that the screw 24 will be used only occasionally, in order to calibrate the recovery device 1 so that the graduations marked on the adjustment wheel 9 correspond to the actual pass depths, in millimeters. For this, the "zero" of the adjustment wheel 9 will be adjusted by positioning, with the aid of the screw 24, the opening 29 of the depth-of-depth stop 26 at the outcrop of the working surface of the grinding wheel 7.

Au cours de la troisième étape dite de reprise, l'utilisateur met en marche le moteur 8 d'actionnement de la meule 7, de manière à commencer à usiner le pied arrière de biseau 102. Puis, lorsque le sommet du biseau 101 de la lentille rentre en contact avec la butée de profondeur de passe 26, l'utilisateur vérifie que la profondeur de passe D1 choisie correspond à celle souhaitée. Si ce n'est pas le cas, il ajuste la hauteur de la butée.During the third so-called resumption step, the user starts the motor 8 for actuating the grinding wheel 7, so as to start machining the rear bevel foot 102. Then, when the apex of the bevel 101 of the When the lens comes into contact with the depth stop 26, the user verifies that the chosen depth of passage D1 corresponds to that desired. If it is not, it adjusts the height of the stop.

Il met ensuite en marche le moteur d'actionnement des arbres 11 de blocage de la lentille, de manière que la meule usine l'ensemble de la périphérie du pied arrière de biseau 102.It then activates the actuating motor 11 of the locking shafts of the lens, so that the grinding wheel mills the entire periphery of the rear bevel foot 102.

Lorsque l'ensemble de la périphérie du pied arrière de biseau 102 est usiné, l'utilisateur commande l'arrêt des deux moteurs puis il extrait la lentille ophtalmique 100 des arbres 11 à l'aide des molettes 13. La lentille ainsi reprise est ensuite aisément emboîtée dans le cercle 110 de la monture sélectionnée, sans qu'aucune interférence n'apparaisse plus entre le pied arrière de biseau 102 de la lentille ophtalmique 100 et le rebord arrière 112 de la face intérieure du cercle 110.When the entire periphery of the rear bevel foot 102 is machined, the user controls the stopping of the two motors and then extracts the ophthalmic lens 100 from the shafts 11 with the help of the knobs 13. The lens thus recovered is then easily nested in the circle 110 of the selected frame, without any interference no longer appears between the rear bevel foot 102 of the ophthalmic lens 100 and the rear flange 112 of the inner face of the circle 110.

Si malgré cette reprise, des interférences subsistent, l'utilisateur pourra à nouveau installer la lentille dans l'appareil de manière à ré-usiner son pied arrière de biseau avec une profondeur de passe plus importante.If despite this recovery, any interference remains, the user may again install the lens in the device so as to re-machine its rear bevel foot with a greater depth of pass.

Les premiers moyens de butée axiale élastiques, permettant de rappeler la lentille ophtalmique contre la meule, pourront directement agir sur les arbres de blocage de la lentille. Dans cette variante, la bascule ne présente aucune mobilité de translation. En revanche, la mobilité de translation axiale des arbres est utilisée pour rappeler élastiquement et de manière synchronisée les deux arbres vers la gauche, de manière à maintenir le flanc arrière du biseau de la lentille ophtalmique au contact de la tranche de la meule.The first resilient axial abutment means, to remind the ophthalmic lens against the grinding wheel, can directly act on the locking shafts of the lens. In this variant, the rocker has no translational mobility. On the other hand, the axial translation mobility of the shafts is used to elastically and synchronously return the two shafts to the left, so as to maintain the trailing edge of the bevel of the ophthalmic lens in contact with the edge of the grinding wheel.

On pourra par ailleurs prévoir de bloquer le porte-lentille et la lentille en translation axiale par rapport au châssis et de conférer à la meule une mobilité de translation axiale par rapport à la lentille suivant un axe sensiblement parallèle à l'axe de blocage. Les premiers moyens de butée axiale élastiques de la lentille contre la meule seront alors agencés pour rappeler l'outil d'usinage dans une direction opposée à la direction du point P1.It will also be possible to block the lens holder and the lens in axial translation with respect to the frame and to give the wheel an axial translational mobility relative to the lens along an axis substantially parallel to the locking axis. The first axial axial abutment means of the lens against the grinding wheel will then be arranged to return the machining tool in a direction opposite to the direction of the point P1.

L'étendue de protection de l'invention est définie dans les revendications ci-jointes.The scope of protection of the invention is defined in the appended claims.

Claims (15)

  1. A method of shaping an ophthalmic lens (100), the method comprising:
    · a step of chamfering said ophthalmic lens (100) to form a bevel (101) on its edge face, the bevel being adjacent to at least one bevel rear flat (102);
    · a step of blocking the beveled ophthalmic lens (100) in blocking and rotary drive means (11, 12) for blocking the lens and driving it in rotation about a blocking axis (A1); and
    · a step of reworking the edge face of the blocked ophthalmic lens (100) in said blocking and rotary drive means (11, 12), which step comprises machining the bevel rear flat (102), excluding the bevel (101) itself, over at least a fraction of its surface by means of a machining tool (7) having a working generator line (A6) that is inclined relative to said blocking axis (A1);
    wherein, during the reworking step, the blocking and rotary drive means (11, 12) are urged axially along the blocking axis (A1) in such a manner that the periphery of the front face (104) of the ophthalmic lens (100) or a front flank (106) of the bevel of the ophthalmic lens (100) comes to bear against rigid first abutment means (30).
  2. A method according to the preceding claim, wherein, during the reworking step, the blocking and rotary drive means (11, 12) and/or the machining tool (7) are urged axially along the blocking axis (A1) in such a manner that a rear flank (103) of the bevel of the ophthalmic lens (100) comes to bear against second abutment means (50; 51) associated with the machining tool (7).
  3. A method according to any preceding claim, wherein said reworking step comprises machining all of the surface of the chamfer rear flat (102).
  4. A method according to any preceding claim, wherein, during said beveling step, the bevel is machined to the edge of the front face (104) of the ophthalmic lens (100) in such a manner that the edge face of said ophthalmic lens (100) does not include a front bevel flat.
  5. A method according to any one of claims 1 to 3, wherein said beveling step includes, in addition to machining the bevel rear flat (102), machining a bevel front flat (105).
  6. A method according to any preceding claim, wherein the ophthalmic lens (100) presents a front optical face of radius of curvature that is less than 120 millimeters and/or an edge face of maximum thickness that is greater than 7 millimeters.
  7. A device for reworking the shaping of a beveled ophthalmic lens (100), the device comprising:
    · a structure (2);
    · a machining tool (7) mounted to rotate on the structure (2) about an axis of rotation (A3);
    · a lens carrier (10) mounted on the structure (2) and provided with blocking and rotary drive means (11, 12) for blocking the ophthalmic lens (100) and driving it in rotation about a blocking axis (A1); and
    · mechanical connection means (3, 4, 14) for mechanically connecting the lens carrier (10) and/or the machining tool (7) to the structure (2) while allowing the spacing between the blocking axis (A1) and the machining tool (7) to be varied;
    the machining tool (7) presenting a working generator line (A6) that is inclined relative to said blocking axis (A1) and including movement means (3) for enabling the ophthalmic lens (100) to move axially relative to the machining tool (7) along said blocking axis (A1),
    the device being characterized by rigid or elastic first axial abutment means (30) serving, during machining, to oppose axial movement of the ophthalmic lens (100) blocked in the blocking and rotary drive means (11, 12) in a direction away from the point (P1) of the blocking axis (A1) that is closest to the working generator line (A6), and/or to oppose movement of the working tool (7) towards said point (P1).
  8. A device according to the preceding claim, wherein said first axial abutment means (30) are elastic and, during machining, urge the ophthalmic lens (100) blocked in the blocking and rotary drive means (11, 12) towards said point (P1) and/or urge the machining tool (7) away from said point (P1).
  9. A device according to the preceding claim, wherein said first axial abutment means (30) are arranged to exert a force on the front face (104) of the ophthalmic lens (100) along an axis that is substantially parallel to the blocking axis (A1), in such a manner as to keep a rear flank (103) of the bevel (101) of said ophthalmic lens (100) in contact with second abutment means (50; 51) associated with the machining tool (7).
  10. A device according to the preceding claim, wherein said second abutment means are formed by a flank (51) or an edge of the machining tool (7).
  11. A device according to either one of the two preceding claims, wherein said second abutment means (50) are non-abrasive and/or movable in rotation relative to the machining tool (7) about the axis of rotation (A3).
  12. A device according to claim 7, wherein the first axial abutment means (30) are rigid and axially adjustable along the blocking axis (A1).
  13. A device according to the preceding claim, including resilient return means (4) for urging the ophthalmic lens (100) against the first axial abutment means (30).
  14. A device according to any one of claims 7 to 13, wherein said first axial abutment means (30) comprise a wheel (33) adapted to bear against the ophthalmic lens (100) so as to roll against the periphery of the front optical face (104) of said ophthalmic lens (100).
  15. A device according to any one of claims 7 to 14, including an adjustable depth-of-pass transverse abutment (26) that is adapted to co-operate in transverse contact with the bevel (101) of the ophthalmic lens (100) blocked in said blocking and rotary drive means (11, 12) in order to limit the capacity of the machining tool (7) to machine in depth.
EP08856411A 2007-09-24 2008-09-19 Device for correcting the edging of an ophthalmic lens and method for edging an ophthalmic lens Active EP2214865B9 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0706660A FR2921285B1 (en) 2007-09-24 2007-09-24 DETOURAGE RECOVERY DEVICE AND METHOD OF DISTRESSING AN OPHTHALMIC LENS
PCT/FR2008/001314 WO2009071771A2 (en) 2007-09-24 2008-09-19 Device for correcting the edging of an ophthalmic lens and method for edging an ophthalmic lens

Publications (3)

Publication Number Publication Date
EP2214865A2 EP2214865A2 (en) 2010-08-11
EP2214865B1 true EP2214865B1 (en) 2011-06-29
EP2214865B9 EP2214865B9 (en) 2012-01-18

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Application Number Title Priority Date Filing Date
EP08856411A Active EP2214865B9 (en) 2007-09-24 2008-09-19 Device for correcting the edging of an ophthalmic lens and method for edging an ophthalmic lens

Country Status (4)

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EP (1) EP2214865B9 (en)
AT (1) ATE514524T1 (en)
FR (1) FR2921285B1 (en)
WO (1) WO2009071771A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106826459A (en) * 2017-03-31 2017-06-13 陈世平 Glasses lens edge polishing beveler
CN114951776B (en) * 2022-06-18 2023-08-08 北京加钛加固技术有限公司 Manufacturing device and manufacturing method for building support steel template

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0639697A (en) * 1992-04-14 1994-02-15 Wernicke & Co Gmbh Processing machine for eyeglass lens edge
JP4131842B2 (en) * 2003-08-29 2008-08-13 株式会社ニデック Eyeglass lens processing equipment
FR2878969B1 (en) * 2004-12-03 2007-04-27 Essilor Int DEVICE FOR AUTOMATICALLY PREPARING THE MOUNTING OF OPHTHALMIC LENSES COMPRISING IMMOBILIZATION AND TRANSFER MEANS
JP4873878B2 (en) * 2005-03-31 2012-02-08 株式会社ニデック Eyeglass lens peripheral processing equipment
JP4397367B2 (en) * 2005-10-11 2010-01-13 株式会社ニデック Lens grinding machine
FR2893524B1 (en) * 2005-11-24 2009-05-22 Essilor Int METHOD AND APPARATUS FOR DISRUPTING AN OPHTHALMIC LENS FOR MACHINING THE LENS OF THE LENS FOLLOWING A WANTED CURVE

Also Published As

Publication number Publication date
EP2214865B9 (en) 2012-01-18
FR2921285B1 (en) 2010-02-12
EP2214865A2 (en) 2010-08-11
FR2921285A1 (en) 2009-03-27
ATE514524T1 (en) 2011-07-15
WO2009071771A3 (en) 2009-08-13
WO2009071771A2 (en) 2009-06-11

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