EP2964423A1

EP2964423A1 - Device for cutting an ophthalmic lens

Info

Publication number: EP2964423A1
Application number: EP14713184.1A
Authority: EP
Inventors: Michel Nauche; Laurent Geysels
Original assignee: Essilor International Compagnie Generale dOptique SA
Current assignee: EssilorLuxottica SA
Priority date: 2013-03-08
Filing date: 2014-02-25
Publication date: 2016-01-13
Anticipated expiration: 2034-02-25
Also published as: US20160008945A1; ES2819225T3; FR3002871B1; WO2014135761A1; CA2904024C; EP2964423B1; FR3002871A1; US9855634B2; CA2904024A1; CN105026106A; CN105026106B; BR112015021775A2

Abstract

The invention relates to a device (1) for cutting an ophthalmic lens (L1) to be mounted onto a spectacle frame, comprising: means (10) for locking and rotating the ophthalmic lens about a locking axis (A1); a tool holder which supports at least one first tool (60) rotatable about a rotational axis (A2) and a second tool (80) rotatable about a finishing axis (A6) and which has a spacing mobility (ESC) for the spacing apart thereof from the locking axis, a shifting mobility (TRA) for the axial positioning thereof along the locking axis, and a pivoting mobility (PIV) for adjusting the orientation of the rotational axis relative to the locking axis; and means for controlling the three mobilities of the tool holder. According to the invention, said rotational and finishing axes are separate from one another.

Description

DEVICE FOR DISRUPTING OPHTHALMIC LENSES

TECHNICAL FIELD TO WHICH THE INVENTION RELATES The present invention relates generally to the trimming of an ophthalmic lens for mounting on an eyeglass frame.

It relates more particularly to a clipping device comprising:

means for blocking and driving in rotation of the ophthalmic lens around a locking pin,

a tool holder which embeds a first rotary tool around an axis of rotation and a second rotary tool around a finishing axis and which is movable relative to said locking and driving means according to three mobilities, of which:

a spreading mobility for adjusting the radial spacing of said first and second tools to the locking pin,

a shift mobility for adjusting the axial position of said first and second tools with respect to said locking and driving means along the locking axis, and

a pivotal mobility about a pivot axis transverse to or orthogonal to the locking pin, for adjusting the orientation of said axes of rotation and finishing with respect to said locking pin, and

- Means for controlling the three mobilities of the tool holder relative to the locking and driving means.

It also relates to a method of using such a clipping device.

BACKGROUND

Document EP 1 679 153 discloses a trimming device of the aforementioned type, wherein the means for clamping and driving in rotation of the lens comprise two coaxial shafts arranged to grip the ophthalmic lens.

The trimming device described in this document comprises a set of roughing wheels and beveling of the lens and two probe rods respectively adapted to come into contact with the front and rear optical faces of the lens in order to measure the geometry .

The mill train and the two probes are for this reason each equipped with motorization means and measuring means of their own.

In this document, the tool holder of the trimming device comprises a support flanked, on one side, of a creasing wheel (the "first tool") and, on the other, a drill bit (the "Second tool"). These two finishing tools are then selected by rotating the support 180 degrees around the pivot axis with the aid of means of motorization that are specific to it.

A disadvantage of this device is that it comprises a large number of motorization means, to the detriment of its cost of manufacture and assembly as well as its size.

The major disadvantage of this device is that the toolholder has a footprint such that it does not bring as close as desired the grinding wheel and the drill bit of the clamping shafts of the ophthalmic lens. Therefore, when the lens has a reduced height, it may be impossible to crimp the lens over its entire contour or drill, the tool holder coming into contact with the clamping shafts.

The Applicant has also found that, even if it would reduce the size of this tool holder, it would not be possible to bring as close as desired the drill bit of the clamping shafts of the lens. Indeed, the diameter of the creasing wheel being greater than that of the drill bit, it may happen that the creasing wheel comes into contact with the clamping shafts before the drill bit reaches the desired position.

OBJECT OF THE INVENTION

In order to overcome the aforementioned drawback of the state of the art, the present invention proposes a new clipping device, in which the first and second tools are positioned differently.

More particularly, it is proposed according to the invention a trimming device as defined in the introduction, wherein said axes of rotation and finishing are distinct.

Thus, thanks to the invention, the first and second tools are positioned relative to one another so that when a tool is selected to machine the lens, the other tool does not interfere with the shafts. tightening the lens, which makes it possible to machine the lens as close as possible to its clamping shafts.

Advantageously, the toolholder also embeds means of measuring the geometry of the ophthalmic lens, and the control means are adapted to select the measuring means or one of said first and second tools, by controlling the pivoting mobility of the tool holder relative to the locking means and driving so as to place said measuring means or one of said first and second tools in position for measuring or machining said ophthalmic lens.

Thus, the motorization means of the tool holder not only position the tools opposite the ophthalmic lens in order to detour, but also to place the measuring means facing the lens to measure the geometry.

This architecture, which reduces the number of engines used, therefore has the advantage of being less expensive and less cumbersome.

Other advantageous and non-limiting features of the clipping device according to the invention are the following:

- The first tool having an outer diameter greater than the outer diameter of the second tool, the projections of the working surfaces of said first and second tools in a plane orthogonal to the finishing axis are at least partly disjoined;

- said axes of rotation and finishing are parallel to each other; said axes of rotation and finishing are inclined relative to one another;

said first and second tools are rotated respectively about the axis of rotation and the finishing axis by a single motor, at different speeds of rotation;

said first tool comprises at least one roughing wheel;

said first tool comprises at least one finishing wheel;

said second tool comprises a creasing wheel and / or a chamfering grinding wheel and / or a drilling bit and / or a cutting bit;

- The tool holder and the locking and driving means are movably mounted on the same frame member;

said spacing mobility is obtained by a pivoting mobility of said locking and driving means with respect to a frame element, around a retraction axis parallel to the locking pin;

the offset mobility is a translational mobility of said tool holder relative to a frame member, along a transfer axis parallel to the locking pin; and

said measurement means comprise a probe which is equipped with a probing tip adapted to bear against at least one of the optical faces of the ophthalmic lens.

The invention also relates to a method for controlling the mobilities of a tool holder with respect to means for locking and driving a machining device as mentioned above, comprising steps of:

selecting a first probe nose by controlling the mobility of pivoting and translation, so as to place this first nose opposite a first optical face of the ophthalmic lens,

measuring the geometry of a first contour located on said first optical face, coordinately controlling the rotational mobility of the locking and driving means and the spreading mobility of the tool holder,

selecting a second probe nose by controlling the mobility of pivoting and translation, so as to place this second nose opposite a second optical face of the ophthalmic lens,

measuring the geometry of a second contour located on said second optical face, coordinately controlling the rotational mobility of the locking and driving means and the spreading mobility of the tool holder,

selecting one of said first and second tools by controlling the pivoting mobility, so as to place this tool opposite the edge of the ophthalmic lens,

- Trimming of the ophthalmic lens by coordinately controlling the rotational mobility of the locking and driving means and the spacing and offset mobilities of the tool holder.

Advantageously, during the trimming step, the pivoting and translation mobility of the tool holder is controlled according to the measured geometries of said two contours.

DETAILED DESCRIPTION OF AN EXEMPLARY EMBODIMENT

The following description with reference to the accompanying drawings, given as non-limiting examples, will make it clear what the invention consists of and how it can be achieved.

In the accompanying drawings: FIG. 1 is a diagram illustrating the different mobilities of the components of the trimming device according to the invention,

FIGS. 2 and 3 are diagrammatic perspective views of the clipping device of FIG. 1, represented without its lower frame, under two different angles,

FIGS. 4 and 5 are detailed views of the probe and the machining tools of the clipping device of FIG. 1,

FIGS. 6A and 7A are diagrammatic views of two embodiments of the tool holder of the trimming device of FIG. 1,

FIGS. 6B and 7B are plan views of projections of the working surfaces of the tools of the tool holders of FIGS. 6A and 7A,

FIGS. 8A and 8B are schematic views of the main motor and the two tools of the tool holder of the trimming device of FIG. 1,

FIGS. 9A and 9B are schematic views of the feeler of the trimming device of FIG. 1, resting against one and the other of the two optical faces of an ophthalmic lens, and

- Figure 10 is a schematic view of an alternative embodiment of the probe of the clipping device of Figure 1, bearing against the edge of an ophthalmic lens.

In Figure 1, there is shown very schematically a trimming device 1 according to the invention.

The clipping device according to the invention could be made in the form of different cutting machines or material removal capable of modifying the initial contour of an ophthalmic lens L1 to adapt to that of an entourage of a eyeglass frame selected.

Here, as shown in Figure 1, the clipping device is constituted by an automatic grinder 1, commonly called digital.

This grinder includes in this case:

a fixed lower frame (not shown),

an upper frame 2 which delimits with the lower frame a housing for receiving the various components of the grinder and which is pivotally mounted on the lower frame to allow access to these different elements,

- Locking means and rotational drive 10 of the ophthalmic lens L1 about a locking pin A1, in practice a horizontal axis, a tool holder 50 which carries at least one tool 60 set in rotation around an axis of rotation A2, as well as measuring means 70 of the geometry of the ophthalmic lens L1, and

control means in position of these different elements. Here, the locking and rotational drive means 10 and the tool holder 50 are mounted on the upper frame 2, which facilitates access to these elements to install an ophthalmic lens to be cut or to repair the grinder. .

Locking means and rotational drive

As shown in FIG. 1, the locking and rotational driving means 10 of the ophthalmic lens L1 comprise a rocker 11 which is rotatably mounted on the upper frame 2 about a parallel retraction axis A3. to the locking pin A1. This mobility of the flip-flop 1 1 is called ESC retraction mobility. It makes it possible to bring the ophthalmic lens L1 closer to or away from the tool holder 50.

The locking and rotational drive means 10 also comprise two shafts 12, 13 aligned with each other along the blocking axis A1, and which are rotatably mounted around this locking pin A1. This mobility of the trees 12, 13 is called ENT training mobility. It makes it possible to present any point of the field of the ophthalmic lens L1 opposite the tool holder 50.

A first of the two shafts 12 is fixed in translation along the blocking axis A1 while the second of these two shafts 13 is conversely mounted to move in translation along the blocking axis A1 relative to the first shaft 12. the shaft 13 is called SER clamping mobility. It makes it possible to achieve the compression in axial compression and the blocking of the ophthalmic lens L1 between these two shafts 12, 13.

Specifically, in the embodiment of the grinder 1 shown in Figures 2 and 3, the architecture of the locking means and rotational drive 10 is as follows.

The upper frame 2 carries a main shaft 3, of axis coinciding with the retraction axis A3, on which is mounted the latch January 1.

As shown in FIG. 3, this rocker January 1 comprises two parallel pillars 14, 15, which are rotatably mounted on the main shaft 3 around of the retraction axis A3, to achieve ESC retraction mobility.

The two shafts 12, 13 are then rotatably mounted on these two pillars 14, 15 to achieve the driving mobility ENT in rotation of the lens around the locking pin A1. These pillars 14, 15 internally house synchronized motorization means, to actuate this drive mobility ENT.

One of the two pillars 14, 15 is also slidably mounted on the main shaft 3 along the axis A3 to achieve the clamping mobility SER in axial compression of the ophthalmic lens L1 between the two shafts 12, 13. 16 is then provided between these two pillars 14, 15 to actuate this SER clamping mobility and to ensure perfect parallelism of the pillars 14, 15.

The rocker January 1 is also flanked by a link 17 whose end is attached to one of the pillars 14 and the other end has a threaded nut (not visible in the figures).

The threaded nut is articulated on the rod 17 to pivot about an axis A8 parallel to the locking pin A1. It is screwed in with a threaded rod 5 which is rotated by a motor 4. This motor 4 is itself rotatably mounted on the upper frame 2 about an axis A9 parallel to the locking pin A1.

Thus, when the motor 4 controls the rotation of the threaded rod 5, the threaded nut is translated on the threaded rod 5 according to a restitution mobility RES. In this way, this ball screw-nut system causes the flip-flop 1 1 to tilt according to the ESC retraction mobility.

Toolbox

As shown diagrammatically in Figure 1, the tool holder 50 comprises a multifunction module 51 which is movably mounted on the upper frame 2 according to a mobility of translation and rotational mobility.

Its translational mobility, called TRA transfer mobility, allows the multifunction module 51 to move along a transfer axis A5 parallel to the locking pin A1 in order to adjust the axial position of the tool holder 50 along the axis. blocking A1.

Its rotational mobility, called pivot mobility PIV, allows the multifunction module 51 to pivot about a pivot axis A4 perpendicular to the locking pin A1 to present one or other of its opposite faces of the ophthalmic lens L1 held between the two shafts 12, 13.

Specifically, in the embodiment of the grinder 1 shown in Figures 2 and 3, the architecture of the tool holder 50 is as follows.

As shown in Figure 3, the upper frame 2 carries two shafts 8 axes parallel to the transfer axis A5, on which is mounted a slide 90 which supports the multifunction module 51.

The multifunction module 51 of the tool holder 50 has a massive shape, generally parallelepiped with an upper face facing the slide 90, an opposite lower face, and four side faces.

The slider 90, which here has a parallelepiped shape, has two through-wells engaged on the two shafts 8 to achieve the transfer mobility TRA of the multifunction module 51 on the upper frame 2 along the transfer axis A5. A motor 9A attached to the upper frame 2 is provided to drive in rotation a ball screw-nut 9B which is engaged with a threaded bore provided in the slider 90, to actuate this transfer mobility TRA.

The multifunctional module 51 carries, projecting from its upper face, a shaft 52 which is engaged through a bore provided in the slider 90, to achieve the pivoting mobility PIV of the multifunction module 51 with respect to the upper frame 2 around the pivot axis A4. A motor 6 attached to the slider 90 rotates a worm 7 which is engaged with a pinion 53 fixed to the upper end of the shaft 52, to actuate this pivotal mobility PIV.

Tools and means of measurement

As shown in Figure 1, the multifunction module 51 of the tool holder 50 carries two tools 60, 80 and here measuring means 70 of the ophthalmic lens L1.

As shown in Figure 6, the first tool here is a grinding wheel 60 and the second tool is a finishing implement 80. The finishing implement 80 has a maximum outside diameter D2 which is smaller than the maximum outside diameter D1 of the grinding wheel 60. .

According to the invention, the wheel 60 is rotatably mounted on the multifunctional module 51 about an axis of rotation A2 which is distinct from the finishing axis A6 around which the finishing accessory 80 is rotatably mounted. Preferably, the projections P60, P80 of the working surfaces of the grinding wheel 60 and the finishing accessory 80 in a projection plane orthogonal to the finishing axis A6 are at least partially disjoint.

In this way, when the finishing accessory 80 approaches the lens L1 for machining, in the immediate vicinity of the two shafts 12, 13 for clamping this lens, the grinding wheel 60 remains at a distance from these two shafts 12, 13 .

In the present case, as shown in FIGS. 1 and 6A, the axes of rotation A2 and finishing A6 are parallel to each other and, as shown in FIG. 6B, the projections P60, P80 of the working surfaces of these tools in the projection plan are completely disjoined.

One could alternatively provide that the projection P80 of the finishing accessory 80 is partially covered by the projection P60 of the grinding wheel 60. However, for this covering is not complete, the diameters D1, D2 of the tools and the distance between E1 between axes of rotation A2 and finishing A6 shall be chosen in such a way that:

D1 <D2 + 2.E1

Still in a variant, as shown in FIG. 7A, it is possible for the axes of rotation A2 and of finishing A6 to be inclined with respect to one another.

In this variant, it will be preferred that these two axes of rotation A2 and finishing A6 are not coplanar.

As shown in FIG. 7B, the projections P60, P80 of the working surfaces of these tools in the projection plane are completely disjoint. It could of course be otherwise, provided that the projection P80 of the finishing accessory 80 is only partially covered by the projection P60 of the grinding wheel 60.

Here, so that there is not complete recovery, it is preferred that the grinding wheel 60 does not cut the finishing axis A6.

As shown diagrammatically in FIG. 1, the multifunction module 51 of the tool holder 50 has only one cylindrical grinding wheel 60.

In practice, as shown in FIG. 5, it comprises rather a set of wheels 60 mounted coaxially on the same axis, each grinding wheel being used for a specific machining operation of the ophthalmic lens L1.

This grinding wheel 60 is here pivotally mounted around the grinding wheel axis A2 (which is orthogonal to the pivot axis A4) and is properly rotated about this axis by a motor 57 housed inside the multifunction module 51.

The grinding wheel 60 here comprises two grinding wheels 61, 64 of the same cylindrical shape of revolution about the grinding wheel axis A2, which make it possible to roughen the ophthalmic lens L1, that is to say to bring back its contour. initial circular to an intermediate contour close to the desired final contour. These two roughing wheels 61, 64 have different grains, optimized for machining lenses made of different materials.

The grinding wheel 60 here also comprises at least one finishing grinding wheel (for chamfering and / or polishing and / or grooving the lens).

The finishing wheels are distinguished from the roughing wheels in particular by their grains (less than 100 microns), which is much smaller than that of the roughing wheels (of the order of 150 to 500 microns).

More specifically, it comprises two beveling wheels 62, 63, of the same shape of revolution around the grinding wheel axis A2, each having a beveling groove in the form of a dihedron. These two grinding wheels make it possible to produce an engagement rib (or "bevel") along the edge of the lens, to allow it to fit into a circle of a set of rimmed spectacles. These two beveling wheels 62, 63 have different grains, optimized for machining lenses made of different materials.

The finishing accessory 80 is more specifically shown in FIG. 4.

It is supported by a mandrel 84 which is pivotally mounted about the finishing axis A6 (orthogonal to the pivot axis A4) and which is duly rotated by a motor 57 housed inside the multifunction module 51.

The finishing accessory 80 comprises in particular a chamfering grinder 83, a grooving grinder 82 and a drill bit 81.

The chamfering grinder 83 has a cylindrical central portion of revolution about the finishing axis A6, flanked by two conical side portions also of revolution about the finishing axis A6. These conical side portions are shaped to machine the sharp edges of the ophthalmic lens L1.

The crease grinder 82 has a thin disc shape. It is shaped to make an interlocking groove along the edge of the ophthalmic lens L1, to allow it to fit into an arcade of a frame of semi-rimmed spectacles.

The drill bit 81 is in turn adapted to make drill holes in the ophthalmic lens, to allow its mounting on a frame of no-circle spectacles.

Alternatively, one could provide to replace the drill bit with a cutting cutter adapted to cut the lens in full material (by cutting rather than removal of material).

One could alternatively provide on the multifunction module 51 a drill bit and a cutter.

The pivoting mobility PIV of the multifunctional module 51 then makes it possible to tilt these different tools 60, 81, 82, 83 with a variable angle with respect to the ophthalmic lens L1, which makes it possible in particular to incline the nesting rib along of the lens field or to pierce the lens along an axis normal to the plane tangent to the front face of the lens at the piercing point.

Here, as shown in FIGS. 8A and 8B, grinding wheel 60 and finishing implement 80 are rotated about their axes of rotation A2 and finishing A6 by the same single motor 57, at different speeds of rotation. .

These rotational speeds are chosen as a function in particular of the material of the lens L1 to be machined and the material of the tool used for this purpose.

Here, the motor 57 drives, on the one hand, the grinding wheel 60 by means of a first transmission mechanism 56, and, on the other hand, the finishing accessory 80 by means of a second transmission mechanism 58. As shown in FIGS. 8A and 8B, these are belt transmission mechanisms, but of course they could be otherwise. It could for example be gear drive mechanism.

While the first transmission mechanism 56 is a continuous (i.e. non-disengageable) torque transmission mechanism, the second transmission mechanism 58 is a disengageable torque transmission mechanism.

In this way, it is possible, during the trimming of the lens L1 by the grinding wheel 60, to disengage the finishing accessory 80, which preserves the bearings and the joints associated with this finishing accessory 80. For this, it is here provided that the second transmission mechanism 58 comprises a freewheel. Thus, when it is desired to use the grinding wheel 60, the motor 57 is driven so that its output shaft rotates in a first direction and only rotates the grinding wheel (FIG. 8A). On the contrary, when it is desired to use the finishing implement 80, the motor 57 is driven so that its output shaft rotates in the opposite direction and rotates the grinding wheel 60 and the finishing implement 80 (FIG. 8B). . This inexpensive system is particularly reliable.

Alternatively, it could be provided that the two transmission mechanisms are disengageable, for example by providing a free wheel in each of them. In this way, when the motor output shaft rotates in one direction, it would rotate only the grinding wheel and, when it rotates in the opposite direction, it would rotate only the finishing implement.

The measuring means 70, which make it possible to acquire the three-dimensional coordinates of points situated on at least one of the optical faces of the ophthalmic lens L1, are more particularly represented in FIG. 5.

They are here designed to record the three-dimensional coordinates of a plurality of characteristic points of the shape of the final contour (according to which it is desired to cut the lens) on each of the two optical faces of the ophthalmic lens L1.

Here, these measuring means are probing means, which are therefore adapted to come into contact with different points of the ophthalmic lens to reveal the three-dimensional coordinates.

Alternatively, it could of course be provided that these measuring means are adapted to perform telemetric measurements on the ophthalmic lens L1, that is to say without contact, for example by laser telemetry.

As shown in FIGS. 4 and 5, these measuring means 70 here comprise a support rod 71 which extends in length along an axis A7 parallel to the axes of rotation A2 and finish A6, and which is equipped with a nozzle of probing 72 adapted to bear against one or other of the optical faces of the ophthalmic lens L1.

As shown in FIG. 5, this probing tip 72 comprises at this effect two identical nozzles 73, 74 which point in directions symmetrical with respect to the axis A7 forming an obtuse angle, and which are thus respectively arranged to palpate one and the other of the two optical faces of the ophthalmic lens L1.

As shown in FIGS. 9A and 9B, the support rod 71 is mounted quasi-fixed on the multifunction module 51 of the tool holder 50.

It only has mobility in rotation around a neutral position, of reduced amplitude (of the order of 1 degree on either side of this neutral position). Feedback means 75 (here springs) are provided on either side of the support rod 71 to return it to the neutral position.

Then, so that the drive means of the grinder 1 can detect a contact between the ophthalmic lens L1 and one of the nozzles 73, 74 of the probe tip, there is provided a position sensor 76 located opposite the internal end of the support rod 71, able to detect any movement of this support rod 71.

Given the stiffness of the springs 75, this position sensor also makes it possible to determine the force applied by the probe tip 72 on the ophthalmic lens L1.

Thus it is possible to palpate the optical faces of the ophthalmic lens L1 by applying a reduced force to the latter, to avoid deforming it and thereby distorting the measurements.

Alternatively, one could also provide to mount the fixed support rod on the multifunction module of the tool holder, and to place a strain gauge on the shaft around which rotates this multifunction module (depending on PIV mobility). Thus, by detecting a torsion of this shaft thanks to this strain gauge, the control means can detect the contact of the probe tip 72 on the ophthalmic lens L1.

In another variant, as shown in FIG. 10, it could be envisaged that these measuring means 70 are adapted to palpate the field of the ophthalmic lens L1, for example to determine the shape of the contour of this lens and the exact position of this lens. contour with respect to the shafts 12, 13.

In this variant, the support rod will be elongate along the axis A7, and have an end bent with respect to this axis A7, preferably an angle equal to 45 degrees. In this way, the position sensor 76 will be able to detect a contact of the probe tip 72 against one of the optical faces of the lens L1 as against the field of the lens L1.

As clearly shown in FIGS. 1 and 2, the measuring means 70, the finishing accessory 80 and the grinding wheel 60 are distributed around the periphery of the multifunction module 51 of the tool holder 50.

Thus, the pivoting mobility PIV of the multifunction module 51 makes it possible to place, according to the angular position of this multifunction module 51 around the pivot axis A4, only one of these different elements 60, 70, 80 facing the lens. ophthalmic L1 blocked between the two shafts 12, 13.

Here, the finishing accessory 80 and the grinding wheel set 60 are in particular located opposite one another with respect to the pivot axis A4, on two opposite lateral faces of the multifunction module 51. The measuring means 70 are in turn located on a third lateral face of the multifunction module 51, between the finishing accessory 80 and the grinding wheel train 60.

Means of control

The control means are designed to control in position the different mobilities of the grinder 1.

They are for this purpose implemented on an electronic control unit and / or computer housed in the upper chassis 2.

They allow in particular to control:

- The cylinder 16 for clamping in axial compression of the ophthalmic lens L1 between the two shafts 12, 13 according to the clamping mobility SER;

the motors driving in rotation of the two shafts 12, 13 according to the driving mobility ENT;

- The drive motor 4 pivoting of the lever 1 1 according to ESC retraction mobility;

the motor 9A driving in translation of the slide 90 according to the transfer mobility TRA;

the pivoting drive motor 6 of the multifunction module 51 according to the pivoting mobility PIV;

- The drive motor in rotation of the wheel train 60;

the drive motor in rotation of the mandrel 84.

Advantageously, these control means are notably arranged to select the measuring means 70 or the finishing accessory 80 or the set of grinding wheels 60 by means of the PIV pivoting of the tool holder 50. Otherwise formulated, the pivoting mobility PIV is controlled by the control means to place the the probe tip 72 or the finishing accessory 80 or the set of grinding wheels 60 facing the lens so that it can perform its machining or measuring function.

However, as explained above, this PIV pivot mobility was already necessary to correctly orient the tools 60, 81, 82, 83 relative to the ophthalmic lens L1. It is thus understood here that the addition of the probing function of the lens on the multifunction module does not require any additional motorization.

The control unit also comprises acquisition means making it possible to record the positions of the various moving components of the grinder 1. These acquisition means also make it possible to record the value of the force exerted by the probe tip 72 on the ophthalmic lens L1.

The grinder 1 finally has a human-machine interface which here comprises a touch screen. This Human Machine Interface allows the user to enter numerical values on the screen to control the grinder 1 accordingly.

These control means then allow, under the control of the optician, to implement four blocking, probing, roughing and finishing operations of the ophthalmic lens L1.

Blocking operation

During the blocking operation, the optician seizes an ophthalmic lens L1 equipped with a locking accessory and then engages it between the two shafts 12, 13 of the grinder 1, taking care to correctly place said locking accessory against the nose of one of the two shafts 12, 13. It then controls, thanks to the touch screen that it has at its disposal, the axial clamping of the lens.

The locking accessory makes it possible to precisely position the ophthalmic lens L1 between the two arms 12, 13, so that the control unit of the grinder 1 can know the exact position of this lens.

The control unit can thus precisely determine the position of the final contour according to which the lens must be cut off, in the reference frame of the grinder 1. Probing operation

At this stage, only the three-dimensional shape of this final contour is known.

However, for the reasons that will be explained in the remainder of this presentation, it is desired to know the three-dimensional shapes of the projections of this final contour on each of the two optical faces of the ophthalmic lens L1.

It is appropriate for this to palpate the two optical faces of the lens using the measuring means.

The probing operation then consists in sequentially palpating the two optical faces of the ophthalmic lens L1 along the final contour, using the two nozzles 73, 74 of the probe tip 72.

Specifically, the control unit then selects a first nozzle 73 of the probe tip 72 by controlling the pivoting mobility PIV and the translational mobility TRA of the multifunction module 51, so as to place the first nozzle 73 at a height of a first of the optical faces of the ophthalmic lens L1.

It then controls the retraction movements ESC and ENT drive to jointly rotate the latch 1 1 and the shafts 12, 13 so that the first optical face of the lens slides on the first spout 73 along the desired contour. These two movements are controlled in coordination with the transfer movement TRA, as a function of the detected position of the support rod 71, so that the first nozzle 73 exerts a reduced but non-zero force on the ophthalmic lens L1, which ensures that the probe tip 72 to remain in continuous contact with the lens.

During this movement, the control unit records the three-dimensional coordinates of a plurality of characteristic points of the projected shape of the final contour on the first optical face of the lens.

The control unit then selects the second spout 74 of the probe tip 72 by controlling the pivoting mobility PIV (about 180 degrees) and the translational mobility TRA of the multifunction module 51, so as to place this second nozzle 74. opposite the second optical face of the ophthalmic lens L1.

It then controls again ESC retraction movements, ENT drive and TRA transfer to record the three-dimensional coordinates of a plurality of characteristic points of the projected shape of the final contour on the second optical face of the lens. Draft operation

For the roughing of the ophthalmic lens L1, one or other of the two roughing wheels 61, 64 is used, depending on the material of the lens to be cut, in order to roughly reduce the outline of the lens to a minimum. intermediate shape that is close but distinct from that of the desired final outline.

In concrete terms, the control unit selects the roughing wheel 61, 64 by controlling the pivoting mobility PIV and the translational mobility TRA of the multifunction module 51, so as to place this roughing wheel 61, 64 opposite the field ophthalmic lens L1.

It then controls the retraction movements ESC and ENT drive to jointly rotate the rocker January 1 and the shafts 12, 13 so as to machine the ophthalmic lens L1 to the intermediate form.

Finishing operations

Finishing operations can be carried out in different ways, depending on whether the ophthalmic lens L1 is intended to be mounted on a frame rimmed glasses, semi-rimless, or without a circle.

Consider first the case where the ophthalmic lens L1 is intended to be mounted on a rimmed spectacle frame.

The finishing operation then consists, during a first step, in machining an engagement rib along the field of the lens, then, in a second step, in chamfering the two sharp cutting edges of the lens. lens.

For the bevelling step, one or other of the two beveling wheels 62, 63 is used, depending on the material of the lens to be cut.

Specifically, the control unit selects for this purpose the beveling wheel 62, 63 by controlling the pivoting mobility PIV and the translational mobility TRA of the multifunction module 51, so as to place the beveling wheel 62, 63 opposite the ophthalmic lens field L1.

It then controls the retraction movements ESC and drive ENT to jointly rotate the rocker January 1 and the shafts 12, 13 so as to machine the interlocking rib according to the desired contour.

These two movements ESC, ENT are controlled in coordination with the transfer movement TRA, so that the nesting rib extends along the front optical face of the lens. This transfer movement TRA is then controlled taking into account the three-dimensional coordinates acquired from the characteristic points of the projected shape of the final outline on the front optical face of the lens.

These two movements ESC, ENT are also controlled in coordination with the pivoting movement PIV, so that the nesting rib has a variable inclination along the field of the lens, depending on the curvature of the lens. This PIV pivoting movement is then controlled taking into account the three-dimensional coordinates acquired from the characteristic points of the projected shape of the final contour on the two optical faces of the lens.

For the chamfering step, the chamfering grinder 83 is used.

Specifically, the control unit selects one of the two conical parts of the chamfering grinder 83 by controlling the pivoting mobility PIV and the translational mobility TRA of the multifunction module 51, so as to place this conical part of the grinding wheel. chamfering 83 opposite one of the two sharp edges of the ophthalmic lens L1.

It then controls the transfer movements TRA, ESC retraction and ENT drive to break this sharp edge along the entire contour of the lens.

The control unit then selects the other of the two conical parts of the chamfering grinder 83 by controlling the pivoting mobility PIV and the translation mobility TRA of the multifunction module 51, so as to place this other conical part of the grinding wheel. chamfering 83 facing each other sharp edges of the ophthalmic lens L1.

It then controls the transfer movements TRA, ESC retraction and ENT drive to break this second sharp edge along the entire contour of the lens.

Thus the ophthalmic lens is ready to be mounted in one of the entourages of the selected rimmed eyeglass frame.

Now consider the case where the ophthalmic lens L1 is intended to be mounted on a spectacle frame without a circle.

The finishing operation then consists, during a first step, of precisely machining the contour of the lens to the desired shape, then, during a second step, chamfering the two sharp cutting edges of the lens, and finally, during a third step, piercing the lens. To implement the first step, the cylindrical zones of one or other of the two beveling wheels 62, 63 (whose grains are finer than those of the roughing wheels) are used, depending on the material of the the lens to be cut.

Specifically, the control unit then selects the beveling wheel 62, 63 by controlling the pivoting mobility PIV and the translational mobility TRA of the multifunction module 51, so as to place one of the cylindrical areas of the beveling wheel 62 , 63 opposite the field of the ophthalmic lens L1.

As a variant, if the set of grinding wheels contained an ice grinding wheel, ie a cylindrical grinding wheel, the driving unit would then select this grinding wheel by controlling the pivoting mobility and the translational mobility of the multifunction module, to place it next to the field of the ophthalmic lens in order to use it.

The control unit then controls the retraction movements ESC and ENT drive to jointly rotate the rocker January 1 and the shafts 12, 13 so as to precisely machine the lens to the shape of the desired contour.

These two movements ESC, ENT are also controlled in coordination with the pivoting movement PIV, so that the field of the lens has an aesthetic inclination, a function of the curvature of the lens. This PIV pivoting movement is then controlled taking into account the three-dimensional coordinates acquired from the characteristic points of the projected shape of the final contour on the two optical faces of the lens.

The second chamfering step is implemented in the same manner as for an ophthalmic lens intended to be mounted on a circled spectacle frame. It will not be redescribed here.

To implement the third step, use the drill bit

81.

The control unit then selects this drill bit 81 by controlling the pivoting mobility PIV and the translation mobility TRA of the multifunction module 51, so as to place this drill opposite a piercing point previously identified on the front face. ophthalmic lens L1.

It also controls the PIV pivoting movement to tilt the drill bit in the desired manner with respect to the lens ophthalmic lens L1, along an axis normal to the plane tangent to the front face of the lens at the piercing point.

It then controls the transfer movements TRA, retraction ESC and drive ENT to pierce the lens along this normal axis tangent plane to the front of the lens at the piercing point.

Thus the ophthalmic lens is ready to be mounted on the lugs of the eyeglass frame without a selected circle.

Consider finally the case where the ophthalmic lens L1 is intended to be mounted on a semi-rimmed eyeglass frame.

The finishing operation then consists, during a first step, in precisely machining the contour of the lens to the desired shape, then, during a second step, in grooving the field of the lens, and finally, during a third step, to chamfer the two sharp sharp edges of the lens.

The first and third steps will then be implemented in the same way as for an ophthalmic lens intended to be mounted on a circle-free spectacle frame. They will not be redescribed here.

To implement the second step, the crease grinder 82 is used so as to be able to machine an interlocking groove along the field of the lens.

Specifically, the control unit selects for this purpose the crimping wheel 82 by controlling the pivoting mobility PIV and the translational mobility TRA of the multifunction module 51, so as to place this creasing grinding wheel 82 opposite the field of the lens ophthalmic L1.

It then controls the retraction movements ESC and ENT drive to jointly rotate the rocker January 1 and the shafts 12, 13 so as to groove the field of the lens.

These two movements ESC, ENT are controlled in coordination with the transfer movement TRA, so that the interlocking groove extends at a constant distance from the front optical face of the lens. This transfer movement TRA is then controlled taking into account the three-dimensional coordinates acquired from the characteristic points of the projected shape of the final contour on the front optical face of the lens.

Thus the ophthalmic lens is ready to be engaged against one of the arcades of the selected semi-circled spectacle frame, before being held against it by a nylon thread provided for this purpose.

Finally, at the end of these finishing operations, the ophthalmic lens L1 is extracted from the shafts 12, 13 of the grinder 1 with the aid of the SER clamping mobility which makes it possible to move the two shafts 12, 13 away. one of the other.

The present invention is not limited to the embodiments described and shown, but the skilled person will be able to make any variant within his mind.

In particular, it could be expected that the grinder has a different shape. Thus, it could be arranged in such a way that the pivot axis (A4) of the tool holder is not orthogonal but inclined with respect to the locking pin (A1).

It could further be provided that the tool holder supports other tools, such as for example an engraving tool, a knife or a cutter.

Claims

1. Device for trimming (1) an ophthalmic lens (L1) for mounting on an eyeglass frame, comprising:

- means for locking and driving (10) in rotation of the ophthalmic lens (L1) around a locking pin (A1),

- a tool holder (50) which embeds a first tool (60) rotatable about an axis of rotation (A2) and a second tool (80) rotatable about a finishing axis (A6) and which is movable by ratio to said locking and driving means (10) according to three mobilities, of which:

a spacer mobility (RES) for adjusting the radial spacing of said first and second tools (60, 80) to the locking pin (A1),

an offset mobility (TRA) for adjusting the axial position of said first and second tools (60, 80) with respect to said locking and driving means (10) along the blocking axis (A1), and

a pivoting mobility (PIV) about a pivot axis (A4) transverse to or orthogonal to the locking pin (A1), for adjusting the orientation of said axes of rotation (A2) and finishing (A6) by report to said blocking axis (A1), and

means for controlling the three mobilities of the tool holder (50) with respect to the locking and driving means (10),

characterized in that said axes of rotation (A2) and finishing (A6) are distinct.

2. Trimming device (1) according to the preceding claim, wherein, the first tool (60) having an outer diameter (D1) greater than the outer diameter (D2) of the second tool (80), the projections of the working surfaces of said first and second tools (60, 80) in a plane orthogonal to the finishing axis (A6) are at least partly disjoint.

3. Trimming device (1) according to one of claims 1 and 2, wherein said axes of rotation (A2) and finishing (A6) are parallel to each other.

4. Trimming device (1) according to one of claims 1 and 2, wherein said axes of rotation (A2) and finish (A6) are inclined relative to each other.

5. Clipping device (1) according to one of the claims wherein said first and second tools (60, 80) are rotated respectively about the axis of rotation (A2) and the finishing axis (A6) by a single motor at different speeds of rotation. .

6. trimming device (1) according to one of the preceding claims, wherein said first tool (60) comprises at least one rough wheel (61, 64).

7. trimming device (1) according to one of the preceding claims, wherein said first tool (60) comprises at least one finishing wheel (62, 63).

The trimming device (1) according to one of the preceding claims, wherein said second tool (80) comprises a creasing wheel (82) and / or a chamfering wheel and / or a drill bit (81) and / or a cutter.

9. Trimming device (1) according to one of the preceding claims, wherein the tool holder (50) and the locking and driving means (10) are movably mounted on the same frame member (2).

10. Trimming device (1) according to one of the preceding claims, wherein said spacing mobility (RES) is obtained by a pivotal mobility (ESC) of said locking and driving means (10) relative to a frame member (2) around a retraction axis (A3) parallel to the locking pin (A1).

1 1. Trimming device (1) according to one of the preceding claims, wherein the offset mobility (TRA) is a mobility of translation of said tool holder (50) relative to a frame member (2), along an axis of transfer (A5) parallel to the blocking axis (A1).

12. Trimming device (1) according to one of the preceding claims, wherein the tool holder (50) also includes means for measuring (70) the geometry of the ophthalmic lens (L1), and wherein the means are adapted to select the measuring means (70) or one of said first and second tools (60, 80), by controlling the pivotal mobility (PIV) of the tool holder (50) relative to the locking means and drive (10) so as to place said measuring means (70) or one of said first and second tools (60, 80) in position for measuring or machining said ophthalmic lens (L1).

13. Trimming device (1) according to the preceding claim, wherein said measuring means (70) comprise a probe (71) which is equipped with a probe tip (72) adapted to bear against one of the less optical faces of the ophthalmic lens (L1).

14. Method for controlling the mobilities of a tool holder (50) relative to locking and driving means (10) of a machining device (1) according to one of claims 12 and 13, comprising steps of:

selecting a first nosepiece (73) of the feeler (71) by controlling the pivoting mobility (PIV) and translation mobility (TRA), so as to place this first nose (73) facing a first optical face of the ophthalmic lens (L1),

measuring the geometry of a first contour located on said first optical face, by coordinately controlling the rotational mobility (ENT) of the locking and driving means (10) and the distance mobility (RES) of the door tool (50),

selecting a second spout (74) of the probe (71) by controlling the pivoting mobility (PIV) and translational mobility (TRA), so as to place this second spout (74) facing a second optical face of the ophthalmic lens (L1),

measuring the geometry of a second contour located on said second optical face, by coordinately controlling the rotational mobility (ENT) of the locking and driving means (10) and the distance mobility (RES) of the door tool (50),

selecting one of said first and second tools (60, 80) by controlling the pivoting mobility (PIV), so as to place this tool (60, 80) facing the edge of the ophthalmic lens (L1),

- Trimming of the ophthalmic lens (L1) by coordinately controlling the rotational mobility (ENT) of the locking and driving means (10) and the spacing (RES) and offset (TRA) displacements of the tool holder (50).

15. Control method according to the preceding claim, wherein, during the trimming step, the pivoting mobility (PIV) and translation (TRA) of the tool holder (50) are controlled according to the measured geometries of said two outlines.