FR2557000A1 - GRINDING STATION FOR GRINDING MACHINE, IN PARTICULAR FOR BEING OR GROOVING AN OPHTHALMIC LENS - Google Patents

Abstract

THIS GRINDING STATION IS OF THE COMPACT TYPE, ROTATING MOUNTED IN A CASING 10 FOR ACTION IN A WORK ZONE 11 ACCESSIBLE FROM THE EXTERIOR OF THIS, A 12 GRINDING WHEEL, AND, ASSOCIATED WITH THIS, IRRIGATION MEANS 29 SUITABLE TO FORM A FLUID FILM ON ITS SURFACE. FOLLOWING AN ASPECT OF THE INVENTION, WITH RESPECT TO THE DIRECTION OF ROTATION OF THE WHEEL 12, THE SAID WATERING MEANS 29 ARE AVAILABLE WIDELY UPSTREAM OF THE WORK ZONE 11 THEREOF, AND BETWEEN THE CORRESPONDING WATERING ZONE AND THE SAID WORK ZONE 11, THERE IS PROVIDED, INSIDE THE CASING 10, AT LEAST ONE DEFLECTOR 33. APPLICATION IN PARTICULAR TO GRINDING MACHINES INTENDED FOR BEVELING OR GROOVING AN OPHTHALMIC LENS.

Description

The present invention relates generally to grinding, and it

  more specifically, but not necessarily exclusively, the case where, after disruption

  an ophthalmic lens around or around the circle

  If it is necessary to equip eyeglass frames, it is necessary to form, on the peripheral edge of this ophthalmic lens, a rib, generally bevelled, or a groove, suitable for holding it in such a circle or surrounding, by interlocking in a complementary groove, or bezel, provided for this purpose on it, or by engagement on a tongue or a wire, which is

  then equipped such a circle or entourage.

  The grinding machines used for this purpose,

  commonly referred to as bevelers, generally comprise at least one grinding station to which a grinding wheel,

  whose slice is contoured to the desired contour, is

rotating head in a housing.

  In practice, for its approach to such a grinding wheel, the ophthalmic beveling or grooving lens is carried by a support pin, which, arranged parallel to the axis of said grinding wheel and itself rotatably mounted on itself, is mounted relative to said axis, for example by

  pivoting about an axis parallel to it, which

  the definition of a specific work area,

  accessible from the outside, for the wheel thus put into

  fever. At the same time, it is customary to associate with this grinding wheel watering means capable of forming a film of fluid on its surface, in particular to ensure cooling,

  and, most often, to convey at the same time to his

  tact, in suspension, any abrasive product

  improve working conditions.

  Most often, these watering means are located in the immediate vicinity of the working area of the grinding wheel and

  imply a simple gravitational spill of the cor-

respondent on this one.

  Such a provision presents, at least, a double

Convenient.

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  First of all, it inevitably results in

unpleasant burrs.

  In addition, it results in the formation of a fog,

  which hinders the observation of the work done6.

  This disadvantage is all the more noticeable since, most often, with respect to the frontal zone, or before, the

  grinding station, where the operator is located to intervene

  nir, the working area of the grinding wheel extends as far as possible to the vertical plane passing through its axis, and usually, in front of this plane, ensorts that the ophthalmic lens

  in the course of occult work itself at least partial-

  for the operator, the direct observation of the said

do not work.

  All of these conditions make it difficult for the observer to control the work

  in progress, as and when the execution of it.

  The present invention generally has the

  object to minimize or even cancel such disadvantages.

  More specifically, it relates to a grinding station for a grinding machine, in particular for beveling

  or the grooving of an ophthalmic lens, of the kind

  both rotatably mounted in a housing, for action in a working area accessible from outside said housing, a grinding wheel, and, associated with said grinding wheel, means for spraying suitable for forming a film of fluid on its surface; grinding station being, according to a first aspect, characterized in that, relative to the direction of rotation of the grinding wheel, said sprinkling means are disposed substantially upstream of the working zone thereof, with a solid angle around the axis of the grinding wheel at least equal to 900, and, between the area

  watering system served by said watering means and

  the work area, it is provided, inside the housing,

at least one deflector.

  Thanks to such an arrangement, and taking into account also that, preferably, the watering sheet of the grinding wheel extends tangentially with respect to it, in

  the direction of rotation of this wheel, the formation of splash-

  in the work area is minimized or even canceled.

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  In a second aspect, the following grinding station

  the invention is further characterized in that it is preferably

  expected an inflow of hot gaseous fluid, air

  example, above the working area of the grinding wheel.

  This advantageously results in any possible formation of fog in the working area, in contact with

  between the ophthalmic lens during work and the

  the, is systematically broken.

  In a third aspect, the grinding station follows

  the invention is further characterized in that, in

  In contrast to its frontal zone, or before, that where the operator is placed to intervene, the working zone of the grinding wheel extends beyond the vertical plane passing through its

  axis, behind this plane, and is for example sensi-

  45th of the plan.

  Thus, the ophthalmic lens during work is not in itself interposed on the normal observation direction of the observer, which on the contrary advantageously has in direct view the contact zone of this object.

ophthalmic lens with the grinding wheel.

  It follows generally from the foregoing that the

  advantageously enjoys excellent conditions of observation of the working area, and more precisely of the contact zone of the ophthalmic lens with the grinding wheel, which enables it to optimally control

  the work in progress for this ophthalmic lens.

  In a fourth aspect, the grinding station follows

  the invention is further characterized in that its grinding wheel

  is generally eccentric in the casing associated with it.

  cié, this one sparing between her and him a space which is

  greater below the plane passing through its axis than

  above. Such an arrangement advantageously makes it possible to break

  systematically the depression likely to take birth

  the grinding of grinding wheel in the fluid bath, which is present in the housing, is stirred by this grinding wheel, and thus avoids any fogging, turbulence, or cavitation, to which 2ss557o0o

  can usually lead such depression.

  The features and advantages of the invention

  out of the description that follows, at

  For example, with reference to the schematic drawings of

  FIGS. 1 is a perspective view of a grinding station according to the invention, and more specifically, essentially of the housing used at this grinding station, with figuration, in fine lines. , of the opening hood associated with it; Figure 2 is a cross-sectional view of the housing, along the line II-II of Figure 1, with, as previously, thin line representation of the opening cover associated therewith; Figure 3 is a plan view along the arrow III of Figure 2; FIG. 4 is a view in axial section, according to the

line IV-IV of Figure 2.

  As illustrated in these figures, and globally-

  the grinding station according to the invention comprises, rotatably mounted in a housing 10 alone shown in solid lines in these figures, for action in a working zone 11 accessible from outside said housing 10, a grinding wheel 12 , which, in the figures, and more precisely only in FIGS. 2, 3, 4, is diagrammatically

  interrupted features, only by its outline.

  In practice, such a grinding station is intended for beveling, or grooving, of an ophthalmic lens 13, which, too, has been schematized only by its outline,

  and in broken lines, in the figures, and more precisely

only in Figure 2.

  According to one aspect of the invention, with respect to

  front, or front, AV of the housing 10, the one where the operator is to intervene, the working area 11 of the grinding wheel 12, o must be arranged the ophthalmic lens 13 to work, extends beyond the plane vertical V passing through the axis A of the wheel 12, behind this plane V. For convenience, the vertical plane V in question has been shown schematically by its trace in Figure 2, and it is

likewise of the axis A of the grinding wheel 12.

  In practice, the working zone 11 of the grinding wheel 12 is located substantially, according to the invention, at 45 behind the vertical plane V previously defined. Overall, in the embodiment shown, the housing 10 forms a cylindrical volume, of generators

  parallel to the axis A of the grinding wheel 12.

  It therefore comprises, from this point of view, an axial wall 15, generally around the axis A of the grinding wheel 12, and two transverse cheeks 16, substantially perpendicular to said axis A. Conjointly, this axial wall 15 and these transverse cheeks 16 form, on the one hand, around the axis A of the grinding wheel 12, a body 17, and, on the other hand, to the right of the working zone 11, a trough 18, projecting from said

body 17.

  In practice, said trough 18 extends towards the rear,

beyond the work area 11.

  Moreover, the housing 10, and more precisely the upper part of its axial wall 15, forms, above the working zone 11 of the grinding wheel 12, for the support of an opening cover 19, a plane P, said here by simple convenience working plane, which, perpendicular to the vertical plane V defined above, and substantially tangentially to the body 17, extends essentially to the right of the trough 18,

  by partially closing it upwards.

  Of course, this work plan P comprises, for ac-

  from the ophthalmic lens 13 to the inner volume of the

  housing 15, an opening 21, which, in the form of

  represented, has a rectangular outline.

  It is this opening 21 that allows the lens

  ophthalmic 13 access to the work area 11.

  At the right of the trough 18, the transverse cheeks 16 of the housing 10 are each perforated, in correspondence of one to the other, for the passage, parallel to the axis A of the grinding wheel 12, a pin 23 adapted to ensure the maintenance and rotation of the ophthalmic lens 13 to work, a buttonhole 24, which elongated arcuate

  circle, extends towards said axis A of the grinding wheel 12.

  Of course, sealing means are preferably

  this associated with each of these buttonholes 24 to ensure tightness despite the passage of the pin 23.

  In practice, these sealing means fall within the scope of

  of art, and not forming part of the present

  vention, they will not be described in detail here.

  In parallel, at the right of the body 17, the transverse cheeks

  versales 16 of the casing 10 are each perforated, in corres-

  with each other, with an opening 26, for the

  passage of the support and drive shaft 27 on the-

  which is stalled in rotation the wheel 12.

  As before, sealing means are preferably

  seen accordingly, which, falling within the competence of the person skilled in the art,

will not be described in detail here.

  Moreover, and as shown, the housing 10 may be generally formed of two shells 10A, 10B, one

  superior, the other inferior, who, properly

  following a joint surface J practically passing through both the axis A of the grinding wheel 12 and the center line of the

  buttonholes 24 of the transverse cheeks 16 are suitable for

  firmly united to each other.

  It will be appreciated by those skilled in the art that the corresponding connecting means will not be described here, and they do not have

  have been shown in the figures.

  Anyway, and according to one aspect of the invention, the grinding wheel 12 is generally eccentric in the housing 10,

  the latter arranging between her and him a space, respectively

  28B, 28A, which is larger below the horizontal plane

  zontal H passing through its axis A than above.

  In other words, the half shell 0lB of the housing 10 is

  deeper than the half-shell 10A is high, the

  28B, 28A corresponding seats being preferred between these half-shells 10B, 10A and the grinding wheel 12 * It is associated with the grinding wheel 12, in the housing 10, sprinkler means 29 adapted to form a film of fluid to

the surface of this grinding wheel 12.

  According to the invention, with respect to the direction of rotation

  grinding wheel 12, as indicated by the arrow F1 in FIG.

  2, said watering means 29 are disposed widely

  upstream of the working zone 11, with a solid angle S,

  turn of the axis A of the grinding wheel 12, at least equal to 90. In practice, in the embodiment shown, the solid angle S, measured between the implantation zone of the watering means 29 and the working zone 11, itself supposed to be reduced to the contact zone between the lens

  ophthalmic 13 and the wheel 12, is of the order of 180.

  In other words, while work zone 11 is

  generally kills 45 behind the vertical plane V,

  above the axis A of the grinding wheel 12, the implantation zone of the watering means 29 is situated at 45 in front of

  this vertical plane V, below said axis A of the grinding wheel 12.

  In practice, in the embodiment shown, the watering means 29 comprise a spray boom 30, which is elongated parallel to the axis A of the grinding wheel 12, of one of the transverse flanges 16 of the casing 10 to another, and a tip 31, which, through the axial wall 15 of the housing and connected to the irrigation boom 30, allows the service

of it.

  In practice, the nozzles of the irrigation ramp 29

  staggered according to the superior governor of that

  ci, so that, as shown schematically by an arrow in broken lines in Figure 2, the watering table N1 corresponding extends tangentially relative to the

  grinding wheel 12, in the direction of rotation thereof.

  In practice, also, the irrigation ramp 30 is disposed vertically above the front generator of the grinding wheel 12, below it, so that the watering zone 32 of this grinding wheel 12 extends downwards. -so substantially following

  said generator before it.

  According to the invention, and in association with the watering means 29 thus constituted, there is provided, inside the housing 10, between the watering zone 32 of the grinding wheel 12 and the working zone 11 thereof. In practice, a plurality of deflectors 33 extend from the watering zone 32 to the working zone 11, and more specifically from the front zone of the casing 10 to the zone 11.

  top of it, around the wheel 12.

  Transversally, that is to say perpendicular to the axis of the grinding wheel 12, each of them has a curved profile, with a concavity turned away from the working zone 11

of said grinding wheel 12.

  Together, longitudinally, that is to say paral-

  Like the axis of the grinding wheel 12, each of them also has a curved profile, with a concacity also turned A

the opposite of the work area 11.

  But, transversely, that is to say perpendicular-

  At the axis A of the grinding wheel 12, they all extend from the inner surface of the housing 10, and more specifically, the relevant part of the axial wall 15 thereof,

  between its front zone and its upper zone.

  According to the invention, an inlet of hot gaseous fluid, for example air, is also provided above the

working area 11 of the grinding wheel 12.

  In practice, in the embodiment shown, there is provided, in the housing 10, for the hot gaseous fluid thus used, a conduit 35, which opens flush with the work plane P, in the interior volume of the opening hood 19. For example, formed in the same thickness of the corresponding portion of the axial wall 15 of the housing 10, in the

  front part thereof, this duct 35 extends from the

  lower part of said casing 10, o a nozzle 36 allows the serving, at its upper part, flush with the work plane P. Preferably, and as shown, the conduit 35 opens obliquely relative to the working plane P, upstream of the working zone 11 of the grinding wheel 12, extending upwardly as it approaches said working plane P, and it opens in the vicinity of a wall 37 of the opening cowl 19 having a skew similar to

hers.

  In practice, in the embodiment shown, the outlet 38 of the duct 35 in the working plane P is elongated in a slot parallel to the axis of the grinding wheel 12.

  immediate proximity to the forward axial edge of the said work plan.

P.

  According to arrangements which do not fall within

  This invention will not be described in detail here, the hot gaseous fluid used is for example hot air taken in the vicinity of the motor driving the training

of the grinding wheel 12.

  It is also provided, in the housing 10, downstream of the working zone 11 of the grinding wheel 12, watering means 40,

clean it.

  In the embodiment shown, these watering means 40 comprise two spray bars 41, which are arranged behind the vertical plane V, below the axis A of the grinding wheel 12, substantially at 45 relative to this axis

  A, and which, like the irrigation ramp 30, extend parallel

  the axis A of one of the transverse cheeks 16 of the car-

  ter 10 to the other, being circumferentially discarded

one from the other.

  The watering means 40 further comprise, for each irrigation boom 41, a nozzle 42, which, connected to this irrigation ramp 41, passes through the axial wall 15 of the housing 10 for its service, in practice by means of pressurized water. Each irrigation ramp 41 has staggered nozzles along a generatrix located on the vertical plane V side.

  The corresponding N 2 cleaning layer is therefore directly

  to the vertical plane V, substantially horizontally for one of the irrigation ramps 41, the one closest to the working zone 11 of the grinding wheel 12, and slightly

  oblique upward for the other of these.

  In combination with the sprinkler means 40 thus formed, it is preferably provided, as shown, at least one deflector 44, or 44 ', adapted to direct towards the lower part of the housing 10, which opens outwardly towards

  the bottom by an evacuation tip 45, the possible gaps

  bursts, to join these with the general reflux of the

  appears. The deflectors 44 are located behind the plane

  vertical V, and the deflectors 44 'in front of it.

  Like the deflectors 33, these deflectors 44 and 44 '

  extend from a transverse cheek 16 of the housing 10 to the

be.

  In addition, like them, they have, transversely, that is-

  perpendicularly to the axis A of the grinding wheel 12, a

curved wire.

  Their concavity is in practice turned towards the vertical plane V. That of the deflectors 44 'is therefore opposite to that of the

deflectors 44.

  But, unlike the deflectors 33, deflections

  44 and 44 'have, longitudinally, parallel to

  the axis A of the grinding wheel 12, a rectilinear profile, and they

  all tend to distance themselves from the corresponding portion of the

  axial wall 15 of the housing 10, to leave a free flow

  between them and this one, at the general ebb of the whole

  ble, towards the exhaust tip 42.

  Finally, in the embodiment shown, there is provided, at the end of the trough 18 that forms the housing 10, watering means 46, constituted in practice by a watering ramp, which, elongated parallel to the axis A of the grinding wheel 12, extending from one transverse cheek 16 of the housing 10 to the other, has its nozzles directed towards the bottom

of said trough 18.

  Moreover, and as will be noted, in the embodiment shown, each of the transverse cheeks

  16 of the casing 10 is reinforced by a rib canceling

  re 48, which, projecting axially towards the grinding wheel 12, has, circularly, an outline substantially similar to that of the latter, and forms a clean deflector to avoid

splashing water.

  The opening cover 19, for its part, has, overall, a

  bell, with, for its outlet, a rectangular outline

  re in the image of that of the worktop P of the housing 10.

the

  As indicated above, its front face 37 is oblique.

  By cons, in the embodiment shown, its other faces extend substantially transversely

  relative to the worktop P of the housing 10.

  Preferably, this opening cover 19 is made of transparent material.

  parent, and, for example, it is made of synthetic

tick.

  In the embodiment shown, it is

  fitted to the housing 10 by a hinge 50, along the transverse edge of the working plane P of this housing 10 furthest from the vertical plane V; so it opens from the front towards

  the rear, following the arrow F2 of Figure 2.

  It follows from the foregoing that, in operation, the opera-

  always has in direct view the working area 11, in

  excellent conditions of visibility.

  In particular, the obliqueness of the duct 35 at its outlet

  close to the worktop P, as well as that of the

  front wall 37 of the opening hood 19 which follows,

  vorisant the drawdown towards the working area 11 of the grinding wheel 12 of the hot gaseous fluid entering the

  interior volume of said opening hood, because of the inci-

  dence that results for this incoming fluid vis-à-vis the

  wall of the latter, and any possible training

  the fog in said work area 11 is located

thus more surely broken.

  Similarly, thanks to the resulting sweep for the hood

  opening 19, any deposit on this opening cover 19 is advantageous

happily avoided.

  Together with the watering means 40 all

  grinding of the grinding wheel 12 is systematically discarded.

  Of course, the present invention is not limited to

  the embodiment described and shown, but

be any variant of execution.

Claims (20)

  1. grinding station for a grinding machine, in particular   for bevelling or grooving an ophthalmic lens   that of the kind comprising, rotatably mounted in a housing (10), for action in an accessible working area (11)   from outside said housing (10), a grinding wheel (12), and,   said sprinkler means (29) adapted to form a fluid film on its surface, characterized in that, with respect to the direction of rotation of the grinding wheel (12), said means for watering (29) are disposed substantially upstream of the working zone (11) thereof, at a solid angle (S) around the axis (A) of the grinding wheel (12) at least equal to 90, and, between the watering zone (32) served by said watering means (29) and said working zone (11), it   is provided, Inside the housing (10), at least one deflec- (33).   2. Grinding station according to claim 1, characterized   in that the solid angle (S) between the area of   tation of the watering means (29) and the working area (11)   of the grinding wheel (12) is of the order of 180.   3. Grinding station according to any one of the   1, 2, characterized in that, transversely,   perpendicular to the axis (A) of the grinding wheel (12), the deflection   (33) has a curved profile, with a concavity turned A   the opposite of the working area (11) of the grinding wheel (12).   4. Grinding station according to any one of the   1 to 3, characterized in that, longitudinally, parallel to the axis (A) of the grinding wheel (12), the deflector   (33) has a curved profile, with a concavity turned to the op-   placed in the working area (11) of the grinding wheel (12).   5. Grinding station according to any one of the   1 to 4, characterized in that, transversely,   perpendicular to the axis (A) of the grinding wheel (12), the deflection   (33) extends from the inner surface of the housing (10).   6. Grinding station according to any one of the   1 to 5, characterized in that, from the zone of ar-   (32) The working area (11) of the grinding wheel (12) is   ring several deflectors (33).   7. Grinding station according to any one of the   1 to 5, characterized in that the watering layer (N1) corresponding to the watering means (29) of the grinding wheel (12) extends tangentially with respect to the latter, in   the direction of rotation of said grinding wheel (12).   8. Grinding station according to any one of the   1 to 7, characterized in that the watering means   ge (29) have a parallel elongate watering boom (30)   parallel to the axis (A) of the grinding wheel (12).   9. Grinding station according to claim 8, characterized   characterized in that said irrigation ramp (30) is arranged   above the front generatrix of the grinding wheel (12), under it.   10. Grinding station according to any one of the   1 to 9, characterized in that there is provided a   of hot gaseous fluid, air for example, above the   working area (11) of the grinding wheel (12).   Grinding station according to claim 10, characterized   characterized in that, the housing (10) forming, above the working area (11) of the grinding wheel (12), for the support of a   opening cover (19), a plane (P), said here for simple convenience   in said casing (10), for the hot gaseous fluid used, a duct (35) is provided,   which opens flush with said work plane (P), in the volume.   me inside said opening cover (19).   12. Grinding station according to claim 11, characterized   characterized in that said duct (35) opens obliquely by   work plan (P), upstream from the area of vail (11) of the grinding wheel (12).   13. Grinding station according to claim 10,   characterized in that said duct (35) emerges in the vicinity of   ge of a wall (37) of the opening hood (19) having a obliquity similar to his.   14. Grinding station according to any one of the   11 to 13, characterized in that the outlet (38) of said duct (35) in the work plane (P) is elongated   slit parallel to the axis (A) of the grinding wheel (12).   15. Grinding station according to any one of the   1 to 14, characterized in that, relative to the front zone (AV), or front, the housing (10), the o is placed the operator to intervene, the working area (ll) of the wheel ( 12) extends beyond the vertical plane (Y)   by its axis (A), behind this plane (V).   16. Grinding station according to claim 15,   characterized in that the working area (11) of the grinding wheel (12) is substantially 450 behind the vertical plane (V) passing through its axis (A).   17. MACHINING POST according to any one of the   1 to 16, characterized in that, in line with the work area (11) of the grinding wheel (12), the housing (10) forms   a trough (18), said trough (18) extends rearwardly,   beyond said working zone (11), and at the end of said trough (18), there are provided in said housing (10), watering means (46).   18. Grinding station according to any one of the   1 to 17, characterized in that, in the housing (10), downstream of the working zone (11) is provided   grinding wheel (12), watering means (40) suitable for cleaning   of the latter, preferably in combination with at least one deflector (44) adapted to direct towards the part   low case (10) possible splashing.   19. Grinding station according to any one of the   1 to 18, characterized in that the grinding wheel (12) is   overall eccentric in the housing (10), the latter   between her and him a space that is larger than   below the plane passing through its axis (A) above.   20. Grinding station according to any one of the   1 to 19, characterized in that each of the transverse cheeks (16) of the housing (10) is reinforced by an annular rib (48) projecting axially towards the grinding wheel (12). contour   substantially similar to that of the latter and deflect tor.