EP2686135B1 - Piece of casing for a time piece and system for manufacturing same - Google Patents

Piece of casing for a time piece and system for manufacturing same Download PDF

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Publication number
EP2686135B1
EP2686135B1 EP12705111.8A EP12705111A EP2686135B1 EP 2686135 B1 EP2686135 B1 EP 2686135B1 EP 12705111 A EP12705111 A EP 12705111A EP 2686135 B1 EP2686135 B1 EP 2686135B1
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EP
European Patent Office
Prior art keywords
curvature
piece
blank
axis
drum
Prior art date
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Active
Application number
EP12705111.8A
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German (de)
French (fr)
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EP2686135A1 (en
Inventor
Gilles Derriey
Jean-Paul Tassetti
Patrice Dumont
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Comadur SA
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Comadur SA
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Publication date
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Priority to EP12705111.8A priority Critical patent/EP2686135B1/en
Publication of EP2686135A1 publication Critical patent/EP2686135A1/en
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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B39/00—Watch crystals; Fastening or sealing of crystals; Clock glasses
    • G04B39/004—Watch crystals; Fastening or sealing of crystals; Clock glasses from a material other than glass
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D3/00—Watchmakers' or watch-repairers' machines or tools for working materials
    • G04D3/06—Devices for shaping or setting watch glasses
    • G04D3/065—Shaping by removing material, e.g. cutting out from a plate, milling the edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/06—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of lenses, the tool or work being controlled by information-carrying means, e.g. patterns, punched tapes, magnetic tapes
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies

Definitions

  • the invention relates to a dressing part for a timepiece and its manufacturing system.
  • the object of the present invention is to overcome all or part of the disadvantages mentioned above by proposing a new manufacturing system allowing the mass production of special glasses whose longitudinal curvatures are independent of the transverse curvatures.
  • the invention relates to a system for manufacturing a trim piece for a timepiece comprising a fixing device comprising a drum rotatably mounted along a first axis and carrying at least one blank of said piece, a machining device comprising abrasive means rotatably mounted along a second axis and intended to machine said at least one blank to form a first curvature characterized in that the machining device further comprises means for moving said second axis so that the latter is movably mounted in a curved director to selectively form a second curvature at said at least one blank and in that said first axis and said second axis are perpendicular to intersect the machining lines.
  • the invention relates to a trim piece having an upper surface and a lower surface characterized in that at least one of the faces has a longitudinal curvature and a transverse curvature which are different and in that at least one one of said longitudinal and transverse curvatures is asymmetrical.
  • the covering part can be complex and allows, for example, to form an asymmetrical ice or whose curve appears visually asymmetrical to adapt for example to timepiece displays that are not centered by compared to its case.
  • the invention relates to a timepiece characterized in that it comprises a dressing part according to one of the previous variants.
  • the invention relates to a non-symmetrical trim piece such as an ice, a case or a dial based on crystallized alumina such as sapphire, corundum or ruby.
  • a non-symmetrical trim piece such as an ice, a case or a dial based on crystallized alumina such as sapphire, corundum or ruby.
  • new manufacturing systems have been developed to adapt for example to timepiece displays that are not centered relative to its housing.
  • the housing may be substantially water drop-shaped and / or non-planar requiring for the harmony of the timepiece to be provided with an off-center display.
  • a manufacturing system 1 has been developed in order to produce trim parts 3 comprising surfaces whose curvatures C 1 , C 2 are concave.
  • the manufacturing system 1 comprises a fixing device 5 and a machining device 7.
  • the fixing device 5 comprises a drum 11 rotatably mounted along a first axis A 1 and carrying at least one blank 3 'of the future part 3.
  • the drum 11 is a ring having a faceted internal wall, that is to say provided with successive planes P x .
  • each successive plane P x receives a blank 3 'which can be fixed, for example, by gluing.
  • the machining device 7 comprises abrasive means 13 which are rotatably mounted along a second axis A 2 and which are intended to machine each blank 3 '.
  • the abrasive means 13 are moved in the hollow of the drum 11 in the form of a ring.
  • the abrasive means 13 presented to the figure 1 are formed by a conventional grinding wheel, that is to say without any particular shape of its contact zone.
  • the abrasive means 13 may be different and, for example, take the form of a curved or conical shoe.
  • the machining device 7 comprises displacement means 15 of the second axis A 2 so that the latter is movably mounted in a curved director C 2 to selectively form a second curvature to each blank 3 '. It is therefore clear that the manufacturing system 1 makes it possible to form first and second curvatures C 1 , C 2 concave.
  • the displacement means 15 may be, without limitation, formed by an actuator moved back and forth against the profile of a fixed cam corresponding to the second curvature C 2 or, for example, a controller programmed to move along said second curvature.
  • the first curvature C 1 is generated perpendicularly to the axis A 1 by the radius extending between the axis A 1 and the contact zone between the abrasive means 13 and each blank 3 '. Because the drum 11 is rotated along the axis A 1 , each blank 3 'is thus transversely excavated along a single radius forming the first curvature C 1 concave.
  • the second curvature C 2 is directly obtained by the selective displacement of the second axis A 2 .
  • the contact area between the abrasive means 13 and each blank 3 ' is progressively displaced with respect to the thickness of the ring-shaped drum 11. Therefore, each blank 3 'is hollowed longitudinally along a curved director forming the second curvature C 2 concave.
  • the director curve of the displacement means 15 may be symmetrical or not to form the second curvature C 2 in one or more rays.
  • first axis A 1 and the second axis A 2 are perpendicular in order to cross the machining lines. This feature advantageously facilitates the subsequent polishing of the trim pieces 3.
  • a manufacturing system 21 has been developed in order to produce trim parts 23 comprising surfaces whose curvatures C 3 , C 4 are convex.
  • the manufacturing system 21 comprises a fixing device 25 and a machining device 27.
  • the fixing device 25 comprises a drum 31 rotatably mounted along a first axis A 3 and carrying at least one blank 23 'of the future part 23.
  • the drum 21 is a disk against the outer wall of which each blank 23 'is fixed, for example, by gluing.
  • the machining device 27 comprises abrasive means 33 which are rotatably mounted along a second axis A 4 and which are intended to machine each blank 23 '.
  • the abrasive means 33 are moved in front of the drum 31.
  • the abrasive means 33 shown in FIG. figure 2 are formed by a conventional grinding wheel, that is to say without any particular shape of its contact zone.
  • the abrasive means 33 may be different and, for example, take the form of a curved or conical shoe as will be explained below.
  • the machining device 27 comprises displacement means 35 of the second axis A 4 so that the latter is movably mounted in a curved director C 4 to selectively form a second curvature to each blank 23 '. It is thus clear that the manufacturing system 21 makes it possible to form first and second curvatures C 3 , C 4 which are convex.
  • the displacement means 35 may be, in a nonlimiting manner, formed by an actuator moved back and forth against the profile of a fixed cam corresponding to the second curvature C 4 or, for example, a controller programmed to move along said second curvature.
  • the first curvature C 3 is generated perpendicular to the axis A 3 by the radius extending between the axis A 3 and the contact zone between the abrasive means 33 and each blank 23 '. Because the drum 31 is rotated along the axis A 3 , each blank 23 'is thus transversely excavated along a single radius forming the first curvature C 3 convex.
  • the second curvature C 4 is directly obtained by the selective displacement of the second axis A 4 .
  • the contact area between the abrasive means 33 and each blank 23 ' is progressively displaced with respect to the thickness of the disk-shaped drum 31. Therefore, each blank 23 'is hollowed longitudinally along a curved director forming the second curvature C 4 convex.
  • the director curve of the displacement means 35 may be symmetrical or not to form the second curvature C 4 in one or more rays.
  • the first axis A 3 and the second axis A 4 are perpendicular in order to cross the machining lines.
  • This feature advantageously facilitates the subsequent polishing of the covering parts 23.
  • the polishing may for example be carried out using fastening and machining device close to the fastening devices 25 and machining 27 realizing the outline of the parts 23 explained above.
  • a polishing step is less aggressive as to the thickness to be removed, only the abrasive means are mainly modified.
  • a manufacturing system 41 has been developed in order to polish parts 43 covering having surfaces whose curvatures C 3 , C 4 are convex.
  • the manufacturing system 41 comprises a fixing device 45 and a machining device 47.
  • the fixing device 45 comprises a rotatably mounted drum 51 which carries at least one piece 43 to be polished.
  • the machining device 47 comprises abrasive means 53 rotatably mounted and intended to polish each piece 43.
  • the abrasive means 53 are moved in front of the drum 51.
  • the abrasive means 53 presented in FIG. figure 3 are preferably formed by a conical shoe, for example of metal, regularly coated with a polishing liquid. Of course, other types of abrasive means such as substantially flat shape may also be suitable.
  • the machining device 47 comprises displacement and plating means 55 in order to force the friction of the abrasive means 53 against each piece 43 for the purpose of selectively polishing them according to the second curvature C 4 . It is therefore clear that the manufacturing system 41 makes it possible to polish first and second curvatures C 3 , C 4 which are convex.
  • the displacement means 55 may be, without limitation, formed by an actuator moved back and forth against the profile of a fixed cam corresponding to the second curvature C 4 or, for example, a controller programmed to move along said second curvature.
  • a manufacturing system 61 has been developed for polishing trim parts 63 having surfaces whose curvatures C 3 , C 4 are convex.
  • the manufacturing system 61 comprises a fixing device 65 and a machining device 67.
  • the attachment device 65 comprises a rotatably mounted drum 71 which carries at least one workpiece 63 to be polished.
  • the machining device 67 comprises abrasive means 73 intended to polish each piece 63.
  • the abrasive means 73 are moved in front of the drum 71.
  • the abrasive means 73 presented in FIG. figure 4 are preferably formed by a curved shoe, for example of metal, regularly coated with a polishing liquid.
  • the machining device 67 comprises displacement and plating means 75 in order to force the friction of the abrasive means 73 against each piece 63 for the purpose of selectively polishing them according to the second curvature C 4 . It is therefore clear that the manufacturing system 61 makes it possible to polish first and second curvatures C 3 , C 4 convex.
  • the displacement means 75 may be, without limitation, formed by an actuator moved back and forth against the profile of a fixed cam corresponding to the second curvature C 4 or, for example, a controller programmed to move along said second curvature.
  • first and second embodiments and their variants can be used alone or in combination. Therefore, a wide variety of dressing part can be obtained in particular that its upper surface and / or its lower surface are machined. It is therefore understood that advantageously according to the invention, at least one of the upper and lower faces may comprise a longitudinal curvature and a transverse curvature which are different.
  • each piece 3 ', 23', 43, 63 may be symmetrical or asymmetrical. It is therefore understood that such a non-symmetrical cladding piece can perfectly form an ice, a case or a dial based on crystallized alumina such as sapphire, corundum or ruby for, for example, a timepiece.
  • the covering part 83 has an upper surface 82 and a lower surface 84 which are machined in order to obtain a substantially constant thickness e 1 despite the complex shape of the part 83.
  • the figure 5 is a representation, seen from above, of the piece 83 substantially ovoid.
  • the longitudinal curvature C 4 intersects the transverse curvature C 3 at the point O 1 .
  • the point O 1 is not centered with respect to the substantially ovoid shape but is closer to the flared portion than the tip.
  • the piece 83 is very curved and allows, for example, to form a glass that appears visually asymmetrical to adapt for example to timepiece displays that are not centered relative to its housing.
  • the covering part 103 comprises an upper surface 102 and a lower surface 104 of which only the upper face is machined so as to obtain a substantially constant thickness e 2 on its edges despite the complex shape of the part 103.
  • the figure 9 is a perspective representation of the substantially ovoid piece 103.
  • the longitudinal curvature C 4 intersects the transverse curvature C 3 at the point O 2 .
  • the point O 2 is not centered with respect to the substantially ovoid shape but is closer to the flared portion than the tip.
  • the curvature C 4 is asymmetrical.
  • the curvature C 3 forms a single radius R 3 and that the curvature C 4 forms two adjacent radii R 4 and R ' 4 .
  • the radius R 4 between the edge of the flared portion and the point O 2 is greater than the radius R ' 4 between the edge of the tip and the point O 2 .
  • the piece 103 is complex and allows, for example, to form an asymmetrical ice to adapt for example to timepiece displays that are not centered relative to its housing.
  • the maximum thickness e 3 of the piece 103 is located vertically above the imaginary point O 2 and the minimum thickness e 2 all around the edge of the piece 103.

Description

Domaine de l'inventionField of the invention

L'invention se rapporte à une pièce d'habillage pour une pièce d'horlogerie et son système de fabrication.The invention relates to a dressing part for a timepiece and its manufacturing system.

Arrière plan de l'inventionBackground of the invention

Il est connu de former des glaces de montre en saphir qui sont très résistantes aux rayures. De telles glaces sont généralement fabriquées par la mise en contact d'une meule rotative contre la surface d'un tambour supportant plusieurs glaces. Le meulage résultant permet de former une glace cylindrique ou sphérique. Toutefois, il devient nécessaire de former des glaces asymétriques pour s'adapter par exemple à des affichages de pièce d'horlogerie qui ne sont pas centrés par rapport à son boîtier ce qui n'est pas possible à partir des techniques actuelles de fabrication en série. Le document WO-98/15876 divulgue un système de fabrication d'une pièce d'habillage pour une pièce d'horlogerie selon le préambule de la revendication 1 et une pièce d'habillage selon le préambule de la revendication 10.It is known to form sapphire watch glasses which are very resistant to scratching. Such ice creams are generally made by contacting a rotating grinding wheel against the surface of a drum supporting a plurality of windows. The resulting grinding makes it possible to form a cylindrical or spherical ice. However, it becomes necessary to form asymmetrical windows to adapt for example to timepiece displays that are not centered relative to its housing which is not possible from the current series of manufacturing techniques. . The document WO-98/15876 discloses a system for manufacturing a trim piece for a timepiece according to the preamble of claim 1 and a trim piece according to the preamble of claim 10.

Résumé de l'inventionSummary of the invention

Le but de la présente invention est de pallier tout ou partie les inconvénients cités précédemment en proposant un nouveau système de fabrication autorisant la fabrication en série de glaces spéciales dont les courbures longitudinales sont indépendantes des courbures transversales.The object of the present invention is to overcome all or part of the disadvantages mentioned above by proposing a new manufacturing system allowing the mass production of special glasses whose longitudinal curvatures are independent of the transverse curvatures.

A cet effet, l'invention se rapporte à un système de fabrication d'une pièce d'habillage pour une pièce d'horlogerie comportant un dispositif de fixation comprenant un tambour monté à rotation selon un premier axe et portant au moins une ébauche de ladite pièce, un dispositif d'usinage comportant des moyens abrasifs montés à rotation selon un deuxième axe et destinés à usiner ladite au moins une ébauche afin de former une première courbure caractérisé en ce que le dispositif d'usinage comporte en outre des moyens de déplacement dudit deuxième axe afin que ce dernier soit monté mobile selon une directrice courbe pour former sélectivement une deuxième courbure à ladite au moins une ébauche et en ce que ledit premier axe et ledit deuxième axe sont perpendiculaires afin de croiser les raies d'usinage.For this purpose, the invention relates to a system for manufacturing a trim piece for a timepiece comprising a fixing device comprising a drum rotatably mounted along a first axis and carrying at least one blank of said piece, a machining device comprising abrasive means rotatably mounted along a second axis and intended to machine said at least one blank to form a first curvature characterized in that the machining device further comprises means for moving said second axis so that the latter is movably mounted in a curved director to selectively form a second curvature at said at least one blank and in that said first axis and said second axis are perpendicular to intersect the machining lines.

On comprend donc qu'au moins une des courbures de la pièce d'habillage est directement formée par le déplacement sélectif, c'est-à-dire totalement libre et maîtrisé, de l'axe de rotation des moyens abrasifs. Par conséquent, il devient possible de fabriquer des glaces très complexes en série avec un taux de rebut avantageux tout en facilitant une étape postérieure de polissage.It is therefore clear that at least one of the curvatures of the dressing part is directly formed by the selective displacement, that is to say completely free and controlled, of the axis of rotation of the abrasive means. As a result, it becomes possible to manufacture very complex ice creams in series with an advantageous scrap rate while facilitating a subsequent polishing step.

Conformément à d'autres caractéristiques avantageuses de l'invention :

  • la directrice des moyens de déplacement est symétrique afin de former ladite deuxième courbure selon un rayon unique ;
  • la directrice des moyens de déplacement est asymétrique afin de former ladite deuxième courbure selon plusieurs rayons ;
  • selon un premier mode de réalisation, le tambour est un anneau contre la paroi interne duquel ladite au moins une ébauche est fixée et en ce que les moyens abrasifs sont déplacés dans le creux dudit anneau afin de former des première et deuxième courbures concaves ;
  • selon un deuxième mode de réalisation, le tambour est un disque contre la paroi externe duquel ladite au moins une ébauche est fixée et en ce que les moyens abrasifs sont déplacés devant ledit disque afin de former des première et deuxième courbures convexes ;
  • les moyens abrasifs sont formés par une meule ;
  • selon une première variante, les moyens de déplacement sont formés par un actionneur déplacé en va-et-vient contre le profil d'une came fixe correspondant à ladite deuxième courbure ;
  • selon une deuxième variante, les moyens de déplacement sont formés par un automate programmé pour se déplacer selon ladite deuxième courbure ;
  • ladite pièce est formée à partir d'alumine cristallisée.
According to other advantageous features of the invention:
  • the director of the displacement means is symmetrical to form said second curvature in a single radius;
  • the director of the displacement means is asymmetrical so as to form said second curvature according to several radii;
  • according to a first embodiment, the drum is a ring against the inner wall of which said at least one blank is fixed and in that the abrasive means are moved in the hollow of said ring to form first and second concave curvatures;
  • according to a second embodiment, the drum is a disk against the outer wall of which said at least one blank is fixed and in that the abrasive means are moved in front of said disk to form first and second convex curvatures;
  • the abrasive means are formed by a grinding wheel;
  • according to a first variant, the displacement means are formed by an actuator moved back and forth against the profile of a fixed cam corresponding to said second curvature;
  • according to a second variant, the displacement means are formed by an automaton programmed to move along said second curvature;
  • said piece is formed from crystallized alumina.

De plus, l'invention se rapporte à une pièce d'habillage comportant une surface supérieure et une surface inférieure caractérisée en ce qu'au moins une des faces comporte une courbure longitudinale et une courbure transversale qui sont différentes et en ce que au moins l'une desdites courbures longitudinale et transversale est asymétrique.In addition, the invention relates to a trim piece having an upper surface and a lower surface characterized in that at least one of the faces has a longitudinal curvature and a transverse curvature which are different and in that at least one one of said longitudinal and transverse curvatures is asymmetrical.

On comprend donc que la pièce d'habillage peut être complexe et permette, par exemple, de former une glace asymétrique ou dont le galbe apparaît visuellement asymétrique pour s'adapter par exemple à des affichages de pièce d'horlogerie qui ne sont pas centrés par rapport à son boîtier.It is therefore understood that the covering part can be complex and allows, for example, to form an asymmetrical ice or whose curve appears visually asymmetrical to adapt for example to timepiece displays that are not centered by compared to its case.

Conformément à d'autres caractéristiques avantageuses de l'invention :

  • les faces inférieure et supérieure comportent une courbure longitudinale et une courbure transversale qui sont différentes ;
  • la pièce d'habillage est formée à partir d'alumine cristallisée.
According to other advantageous features of the invention:
  • the lower and upper faces have a longitudinal curvature and a transverse curvature which are different;
  • the dressing part is formed from crystallized alumina.

Enfin, l'invention se rapporte à une pièce d'horlogerie caractérisée en ce qu'elle comporte une pièce d'habillage selon l'une des variantes précédentes.Finally, the invention relates to a timepiece characterized in that it comprises a dressing part according to one of the previous variants.

Description sommaire des dessinsBrief description of the drawings

D'autres particularités et avantages ressortiront clairement de la description qui en est faite ci-après, à titre indicatif et nullement limitatif, en référence aux dessins annexés, dans lesquels :

  • la figure 1 est une vue d'un système de fabrication selon un premier mode de réalisation de l'invention ;
  • les figures 2 à 4 sont des vues d'un système de fabrication selon un deuxième mode de réalisation de l'invention ;
  • les figures 5 à 7 sont des représentations d'une pièce d'habillage selon une première variante de l'invention ;
  • les figures 8 à 10 sont des représentations d'une pièce d'habillage selon une deuxième variante de l'invention.
Other particularities and advantages will emerge clearly from the description which is given hereinafter, by way of indication and in no way limiting, with reference to the appended drawings, in which:
  • the figure 1 is a view of a manufacturing system according to a first embodiment of the invention;
  • the Figures 2 to 4 are views of a manufacturing system according to a second embodiment of the invention;
  • the Figures 5 to 7 are representations of a dressing part according to a first variant of the invention;
  • the Figures 8 to 10 are representations of a dressing part according to a second variant of the invention.

Description détaillée des modes de réalisation préférésDetailed Description of the Preferred Embodiments

L'invention se rapporte à une pièce d'habillage non symétrique comme une glace, un boîtier ou un cadran à base d'alumine cristallisée comme du saphir, du corindon ou du rubis. Pour réaliser ces nouvelles pièces, de nouveaux systèmes de fabrication ont été développés pour s'adapter par exemple à des affichages de pièce d'horlogerie qui ne sont pas centrés par rapport à son boîtier. A titre d'exemple, le boîtier peut être sensiblement en forme de goutte d'eau et/ou non plan nécessitant pour l'harmonie de la pièce d'horlogerie d'être pourvu d'un affichage décentré.The invention relates to a non-symmetrical trim piece such as an ice, a case or a dial based on crystallized alumina such as sapphire, corundum or ruby. To achieve these new parts, new manufacturing systems have been developed to adapt for example to timepiece displays that are not centered relative to its housing. For example, the housing may be substantially water drop-shaped and / or non-planar requiring for the harmony of the timepiece to be provided with an off-center display.

Bien entendu, même si la présente invention a été développée pour le domaine de l'horlogerie, elle ne saurait s'y limiter. D'autres applications sont également envisageables comme dans l'optique, les arts de la table ou l'électronique.Of course, even if the present invention has been developed for the field of watchmaking, it can not be limited thereto. Other applications are also conceivable, such as optics, tableware or electronics.

Selon un premier mode de réalisation illustré à la figure 1, un système de fabrication 1 a été développé afin de réaliser des pièces 3 d'habillage comportant des surfaces dont les courbures C1, C2 sont concaves. Le système de fabrication 1 comporte un dispositif de fixation 5 et un dispositif d'usinage 7.According to a first embodiment illustrated in figure 1 , a manufacturing system 1 has been developed in order to produce trim parts 3 comprising surfaces whose curvatures C 1 , C 2 are concave. The manufacturing system 1 comprises a fixing device 5 and a machining device 7.

Le dispositif de fixation 5 comprend un tambour 11 monté à rotation selon un premier axe A1 et portant au moins une ébauche 3' de la future pièce 3. Préférentiellement, comme visible à la figure 1, le tambour 11 est un anneau comportant une paroi interne facettée, c'est-à-dire munie de plans Px successifs. Comme illustré à la figure 1, chaque plan Px successif reçoit une ébauche 3' qui peut être fixée, par exemple, par collage.The fixing device 5 comprises a drum 11 rotatably mounted along a first axis A 1 and carrying at least one blank 3 'of the future part 3. Preferably, as visible in FIG. figure 1 , the drum 11 is a ring having a faceted internal wall, that is to say provided with successive planes P x . As illustrated in figure 1 each successive plane P x receives a blank 3 'which can be fixed, for example, by gluing.

Le dispositif d'usinage 7 comporte des moyens abrasifs 13 qui sont montés à rotation selon un deuxième axe A2 et qui sont destinés à usiner chaque ébauche 3'. Préférentiellement, les moyens abrasifs 13 sont déplacés dans le creux du tambour 11 en forme d'anneau. Les moyens abrasifs 13 présentés à la figure 1 sont formés par une meule classique, c'est-à-dire sans forme particulière de sa zone de contact. Bien entendu, les moyens abrasifs 13 peuvent être différents et, par exemple, prendre la forme d'un sabot courbe ou conique.The machining device 7 comprises abrasive means 13 which are rotatably mounted along a second axis A 2 and which are intended to machine each blank 3 '. Preferably, the abrasive means 13 are moved in the hollow of the drum 11 in the form of a ring. The abrasive means 13 presented to the figure 1 are formed by a conventional grinding wheel, that is to say without any particular shape of its contact zone. Of course, the abrasive means 13 may be different and, for example, take the form of a curved or conical shoe.

Avantageusement selon l'invention, le dispositif d'usinage 7 comporte des moyens de déplacement 15 du deuxième axe A2 afin que ce dernier soit monté mobile selon une directrice courbe C2 pour former sélectivement une deuxième courbure à chaque ébauche 3'. On comprend donc que le système de fabrication 1 permet de former des première et deuxième courbures C1, C2 concaves.Advantageously according to the invention, the machining device 7 comprises displacement means 15 of the second axis A 2 so that the latter is movably mounted in a curved director C 2 to selectively form a second curvature to each blank 3 '. It is therefore clear that the manufacturing system 1 makes it possible to form first and second curvatures C 1 , C 2 concave.

Selon l'invention, les moyens de déplacement 15 peuvent être, de manière non limitative, formés par un actionneur déplacé en va-et-vient contre le profil d'une came fixe correspondant à la deuxième courbure C2 ou, par exemple, un automate programmé pour se déplacer selon ladite deuxième courbure.According to the invention, the displacement means 15 may be, without limitation, formed by an actuator moved back and forth against the profile of a fixed cam corresponding to the second curvature C 2 or, for example, a controller programmed to move along said second curvature.

Ainsi, la première courbure C1 est générée perpendiculairement à l'axe A1 par le rayon s'étendant entre l'axe A1 et la zone de contact entre les moyens abrasifs 13 et chaque ébauche 3'. Du fait que le tambour 11 est déplacé à rotation selon l'axe A1, chaque ébauche 3' est donc creusée transversalement selon un rayon unique formant la première courbure C1 concave.Thus, the first curvature C 1 is generated perpendicularly to the axis A 1 by the radius extending between the axis A 1 and the contact zone between the abrasive means 13 and each blank 3 '. Because the drum 11 is rotated along the axis A 1 , each blank 3 'is thus transversely excavated along a single radius forming the first curvature C 1 concave.

De plus, avantageusement selon l'invention, la deuxième courbure C2 est directement obtenue par le déplacement sélectif du deuxième axe A2. Ainsi, pendant que la première courbure C1 est générée, la zone de contact entre les moyens abrasifs 13 et chaque ébauche 3' est progressivement déplacée par rapport à l'épaisseur du tambour 11 en forme d'anneau. Par conséquent, chaque ébauche 3' est creusée longitudinalement selon une directrice courbe formant la deuxième courbure C2 concave.In addition, advantageously according to the invention, the second curvature C 2 is directly obtained by the selective displacement of the second axis A 2 . Thus, while the first curvature C 1 is generated, the contact area between the abrasive means 13 and each blank 3 'is progressively displaced with respect to the thickness of the ring-shaped drum 11. Therefore, each blank 3 'is hollowed longitudinally along a curved director forming the second curvature C 2 concave.

On comprend donc immédiatement que la directrice courbe des moyens de déplacement 15 peut être symétrique ou non afin de former la deuxième courbure C2 selon un ou plusieurs rayons.It is therefore immediately understood that the director curve of the displacement means 15 may be symmetrical or not to form the second curvature C 2 in one or more rays.

Enfin, préférentiellement selon l'invention, le premier axe A1 et le deuxième axe A2 sont perpendiculaires afin de croiser les raies d'usinage. Cette caractéristique permet avantageusement de faciliter le polissage postérieur des pièces d'habillage 3.Finally, preferentially according to the invention, the first axis A 1 and the second axis A 2 are perpendicular in order to cross the machining lines. This feature advantageously facilitates the subsequent polishing of the trim pieces 3.

Selon un deuxième mode de réalisation illustré aux figures 2 à 4, un système de fabrication 21 a été développé afin de réaliser des pièces 23 d'habillage comportant des surfaces dont les courbures C3, C4 sont convexes. Le système de fabrication 21 comporte un dispositif de fixation 25 et un dispositif d'usinage 27.According to a second embodiment illustrated in Figures 2 to 4 , a manufacturing system 21 has been developed in order to produce trim parts 23 comprising surfaces whose curvatures C 3 , C 4 are convex. The manufacturing system 21 comprises a fixing device 25 and a machining device 27.

Le dispositif de fixation 25 comprend un tambour 31 monté à rotation selon un premier axe A3 et portant au moins une ébauche 23' de la future pièce 23. Préférentiellement, comme visible à la figure 2, le tambour 21 est un disque contre la paroi externe duquel chaque ébauche 23' est fixée, par exemple, par collage.The fixing device 25 comprises a drum 31 rotatably mounted along a first axis A 3 and carrying at least one blank 23 'of the future part 23. Preferably, as visible in FIG. figure 2 , the drum 21 is a disk against the outer wall of which each blank 23 'is fixed, for example, by gluing.

Le dispositif d'usinage 27 comporte des moyens abrasifs 33 qui sont montés à rotation selon un deuxième axe A4 et qui sont destinés à usiner chaque ébauche 23'. Préférentiellement, les moyens abrasifs 33 sont déplacés devant le tambour 31. Les moyens abrasifs 33 présentés à la figure 2 sont formés par une meule classique, c'est-à-dire sans forme particulière de sa zone de contact. Bien entendu, les moyens abrasifs 33 peuvent être différents et, par exemple, prendre la forme d'un sabot courbe ou conique comme cela sera expliqué ci-dessous.The machining device 27 comprises abrasive means 33 which are rotatably mounted along a second axis A 4 and which are intended to machine each blank 23 '. Preferably, the abrasive means 33 are moved in front of the drum 31. The abrasive means 33 shown in FIG. figure 2 are formed by a conventional grinding wheel, that is to say without any particular shape of its contact zone. Of course, the abrasive means 33 may be different and, for example, take the form of a curved or conical shoe as will be explained below.

Avantageusement selon l'invention, le dispositif d'usinage 27 comporte des moyens de déplacement 35 du deuxième axe A4 afin que ce dernier soit monté mobile selon une directrice courbe C4 pour former sélectivement une deuxième courbure à chaque ébauche 23'. On comprend donc que le système de fabrication 21 permet de former des première et deuxième courbures C3, C4 convexes.Advantageously according to the invention, the machining device 27 comprises displacement means 35 of the second axis A 4 so that the latter is movably mounted in a curved director C 4 to selectively form a second curvature to each blank 23 '. It is thus clear that the manufacturing system 21 makes it possible to form first and second curvatures C 3 , C 4 which are convex.

Selon l'invention, les moyens de déplacement 35 peuvent être, de manière non limitative, formés par un actionneur déplacé en va-et-vient contre le profil d'une came fixe correspondant à la deuxième courbure C4 ou, par exemple, un automate programmé pour se déplacer selon ladite deuxième courbure.According to the invention, the displacement means 35 may be, in a nonlimiting manner, formed by an actuator moved back and forth against the profile of a fixed cam corresponding to the second curvature C 4 or, for example, a controller programmed to move along said second curvature.

Ainsi, la première courbure C3 est générée perpendiculairement à l'axe A3 par le rayon s'étendant entre l'axe A3 et la zone de contact entre les moyens abrasifs 33 et chaque ébauche 23'. Du fait que le tambour 31 est déplacé à rotation selon l'axe A3, chaque ébauche 23' est donc creusée transversalement selon un rayon unique formant la première courbure C3 convexe.Thus, the first curvature C 3 is generated perpendicular to the axis A 3 by the radius extending between the axis A 3 and the contact zone between the abrasive means 33 and each blank 23 '. Because the drum 31 is rotated along the axis A 3 , each blank 23 'is thus transversely excavated along a single radius forming the first curvature C 3 convex.

De plus, avantageusement selon l'invention, la deuxième courbure C4 est directement obtenue par le déplacement sélectif du deuxième axe A4. Ainsi, pendant que la première courbure C3 est générée, la zone de contact entre les moyens abrasifs 33 et chaque ébauche 23' est progressivement déplacée par rapport à l'épaisseur du tambour 31 en forme de disque. Par conséquent, chaque ébauche 23' est creusée longitudinalement selon une directrice courbe formant la deuxième courbure C4 convexe.In addition, advantageously according to the invention, the second curvature C 4 is directly obtained by the selective displacement of the second axis A 4 . Thus, while the first curvature C 3 is generated, the contact area between the abrasive means 33 and each blank 23 'is progressively displaced with respect to the thickness of the disk-shaped drum 31. Therefore, each blank 23 'is hollowed longitudinally along a curved director forming the second curvature C 4 convex.

On comprend donc immédiatement que la directrice courbe des moyens de déplacement 35 peut être symétrique ou non afin de former la deuxième courbure C4 selon un ou plusieurs rayons.It is therefore immediately understood that the director curve of the displacement means 35 may be symmetrical or not to form the second curvature C 4 in one or more rays.

Enfin, préférentiellement selon l'invention, le premier axe A3 et le deuxième axe A4 sont perpendiculaires afin de croiser les raies d'usinage. Cette caractéristique permet avantageusement de faciliter le polissage postérieur des pièces d'habillage 23. Le polissage peut à titre d'exemple être effectué à l'aide de dispositif de fixation et d'usinage proche des dispositifs de fixation 25 et d'usinage 27 réalisant l'ébauche des pièce 23 expliqués ci-dessus. Toutefois, une étape de polissage étant moins agressive quant à l'épaisseur à retirer, seuls les moyens abrasifs sont principalement modifiés.Finally, preferably according to the invention, the first axis A 3 and the second axis A 4 are perpendicular in order to cross the machining lines. This feature advantageously facilitates the subsequent polishing of the covering parts 23. The polishing may for example be carried out using fastening and machining device close to the fastening devices 25 and machining 27 realizing the outline of the parts 23 explained above. However, since a polishing step is less aggressive as to the thickness to be removed, only the abrasive means are mainly modified.

Ainsi, deux exemples de polissage sont présentés aux figures 3 et 4. Selon une première alternative du deuxième mode de réalisation illustré à la figure 3, un système de fabrication 41 a été développé afin de polir des pièces 43 d'habillage comportant des surfaces dont les courbures C3, C4 sont convexes. Le système de fabrication 41 comporte un dispositif de fixation 45 et un dispositif d'usinage 47.Thus, two examples of polishing are presented to Figures 3 and 4 . According to a first alternative of the second embodiment illustrated in FIG. figure 3 , a manufacturing system 41 has been developed in order to polish parts 43 covering having surfaces whose curvatures C 3 , C 4 are convex. The manufacturing system 41 comprises a fixing device 45 and a machining device 47.

Le dispositif de fixation 45 comprend un tambour 51 monté à rotation qui porte au moins une pièce 43 à polir. Le dispositif d'usinage 47 comporte des moyens abrasifs 53 montés à rotation et destinés à polir chaque pièce 43. Préférentiellement, les moyens abrasifs 53 sont déplacés devant le tambour 51. Les moyens abrasifs 53 présentés à la figure 3 sont, de manière préférée, formés par un sabot conique, par exemple en métal, régulièrement enduit d'un liquide de polissage. Bien entendu, d'autres types de moyens abrasifs comme de forme sensiblement plane peuvent également convenir.The fixing device 45 comprises a rotatably mounted drum 51 which carries at least one piece 43 to be polished. The machining device 47 comprises abrasive means 53 rotatably mounted and intended to polish each piece 43. Preferably, the abrasive means 53 are moved in front of the drum 51. The abrasive means 53 presented in FIG. figure 3 are preferably formed by a conical shoe, for example of metal, regularly coated with a polishing liquid. Of course, other types of abrasive means such as substantially flat shape may also be suitable.

Avantageusement selon l'invention, le dispositif d'usinage 47 comporte des moyens de déplacement et de placage 55 afin de forcer le frottement des moyens abrasifs 53 contre chaque pièce 43 dans le but de les polir sélectivement selon la deuxième courbure C4. On comprend donc que le système de fabrication 41 permet de polir des première et deuxième courbures C3, C4 convexes.Advantageously according to the invention, the machining device 47 comprises displacement and plating means 55 in order to force the friction of the abrasive means 53 against each piece 43 for the purpose of selectively polishing them according to the second curvature C 4 . It is therefore clear that the manufacturing system 41 makes it possible to polish first and second curvatures C 3 , C 4 which are convex.

Selon l'invention, les moyens de déplacement 55 peuvent être, de manière non limitative, formés par un actionneur déplacé en va-et-vient contre le profil d'une came fixe correspondant à la deuxième courbure C4 ou, par exemple, un automate programmé pour se déplacer selon ladite deuxième courbure.According to the invention, the displacement means 55 may be, without limitation, formed by an actuator moved back and forth against the profile of a fixed cam corresponding to the second curvature C 4 or, for example, a controller programmed to move along said second curvature.

Selon une deuxième alternative du deuxième mode de réalisation illustré à la figure 4, un système de fabrication 61 a été développé afin de polir des pièces 63 d'habillage comportant des surfaces dont les courbures C3, C4 sont convexes. Le système de fabrication 61 comporte un dispositif de fixation 65 et un dispositif d'usinage 67.According to a second alternative of the second embodiment illustrated in FIG. figure 4 , a manufacturing system 61 has been developed for polishing trim parts 63 having surfaces whose curvatures C 3 , C 4 are convex. The manufacturing system 61 comprises a fixing device 65 and a machining device 67.

Le dispositif de fixation 65 comprend un tambour 71 monté à rotation qui porte au moins une pièce 63 à polir. Le dispositif d'usinage 67 comporte des moyens abrasifs 73 destinés à polir chaque pièce 63. Préférentiellement, les moyens abrasifs 73 sont déplacés devant le tambour 71. Les moyens abrasifs 73 présentés à la figure 4 sont, de manière préférée, formés par un sabot courbe, par exemple en métal, régulièrement enduit d'un liquide de polissage.The attachment device 65 comprises a rotatably mounted drum 71 which carries at least one workpiece 63 to be polished. The machining device 67 comprises abrasive means 73 intended to polish each piece 63. Preferably, the abrasive means 73 are moved in front of the drum 71. The abrasive means 73 presented in FIG. figure 4 are preferably formed by a curved shoe, for example of metal, regularly coated with a polishing liquid.

Avantageusement selon l'invention, le dispositif d'usinage 67 comporte des moyens de déplacement et de placage 75 afin de forcer le frottement des moyens abrasifs 73 contre chaque pièce 63 dans le but de les polir sélectivement selon la deuxième courbure C4. On comprend donc que le système de fabrication 61 permet de polir des première et deuxième courbures C3, C4 convexes.Advantageously according to the invention, the machining device 67 comprises displacement and plating means 75 in order to force the friction of the abrasive means 73 against each piece 63 for the purpose of selectively polishing them according to the second curvature C 4 . It is therefore clear that the manufacturing system 61 makes it possible to polish first and second curvatures C 3 , C 4 convex.

Selon l'invention, les moyens de déplacement 75 peuvent être, de manière non limitative, formés par un actionneur déplacé en va-et-vient contre le profil d'une came fixe correspondant à la deuxième courbure C4 ou, par exemple, un automate programmé pour se déplacer selon ladite deuxième courbure.According to the invention, the displacement means 75 may be, without limitation, formed by an actuator moved back and forth against the profile of a fixed cam corresponding to the second curvature C 4 or, for example, a controller programmed to move along said second curvature.

Ces premier et deuxième modes de réalisation ainsi que leur variantes peuvent être utilisés seuls ou en combinaison. Par conséquent, une grande variété de la pièce d'habillage peut être obtenue suivant notamment que sa surface supérieure et/ou sa surface inférieure sont usinées. On comprend donc toutefois qu'avantageusement selon l'invention, au moins une des faces supérieure et inférieure peut comporter une courbure longitudinale et une courbure transversale qui sont différentes.These first and second embodiments and their variants can be used alone or in combination. Therefore, a wide variety of dressing part can be obtained in particular that its upper surface and / or its lower surface are machined. It is therefore understood that advantageously according to the invention, at least one of the upper and lower faces may comprise a longitudinal curvature and a transverse curvature which are different.

De plus, suivant l'orientation de chaque pièce 3', 23', 43, 63 par rapport aux dispositifs de fixation 5, 25, 45, 65, au moins l'une desdites courbures longitudinale et transversale peut être symétrique ou asymétrique. On comprend donc qu'une telle pièce d'habillage non symétrique peut parfaitement former une glace, un boîtier ou un cadran à base d'alumine cristallisée comme du saphir, du corindon ou du rubis pour, par exemple, une pièce d'horlogerie.In addition, depending on the orientation of each piece 3 ', 23', 43, 63 relative to the fixing devices 5, 25, 45, 65, at least one of said longitudinal and transverse curvatures may be symmetrical or asymmetrical. It is therefore understood that such a non-symmetrical cladding piece can perfectly form an ice, a case or a dial based on crystallized alumina such as sapphire, corundum or ruby for, for example, a timepiece.

Deux variantes de pièces 83, 103 formant des glaces de pièce d'horlogerie réalisables selon l'invention sont présentées aux figures 5-7 et 8-10. Selon la première variante, la pièce d'habillage 83 comporte une surface supérieure 82 et une surface inférieure 84 qui sont usinées afin d'obtenir une épaisseur sensiblement constante e1 malgré la forme complexe de la pièce 83.Two variants of pieces 83, 103 forming timepiece glasses realizable according to the invention are presented to the Figures 5-7 and 8-10. According to the first variant, the covering part 83 has an upper surface 82 and a lower surface 84 which are machined in order to obtain a substantially constant thickness e 1 despite the complex shape of the part 83.

Ainsi, la figure 5 est une représentation, vue de dessus, de la pièce 83 sensiblement ovoïde. La courbure longitudinale C4 est sécante de la courbure transversale C3 au point O1. On remarque que le point O1 n'est pas centré par rapport à la forme sensiblement ovoïde mais est plus proche de la partie évasée que de la pointe. Cette configuration de la pièce 83 lorsqu'elle est rapportée sur un boîtier de pièce d'horlogerie permet d'accentuer visuellement l'intégration déportée de l'affichage de la pièce d'horlogerie.So, the figure 5 is a representation, seen from above, of the piece 83 substantially ovoid. The longitudinal curvature C 4 intersects the transverse curvature C 3 at the point O 1 . Note that the point O 1 is not centered with respect to the substantially ovoid shape but is closer to the flared portion than the tip. This configuration of the piece 83 when it is attached to a timepiece case makes it possible to visually accentuate the remote integration of the display of the timepiece.

Comme visible à la figure 7 représentant la coupe A-A de la figure 5, c'est-à-dire une coupe longitudinale, on peut voir que les courbures C2 et C4 sont parallèles. Dans l'exemple des figures 5 à 7, on remarque qu'en fait les courbures C2 et C4 forment respectivement un rayon unique R2 et R4 de sorte que R4 = R2 + e1.As visible at figure 7 representing the AA cup of the figure 5 , that is to say a longitudinal section, it can be seen that the curvatures C 2 and C 4 are parallel. In the example of Figures 5 to 7 , we notice that in fact the curvatures C 2 and C 4 respectively form a single radius R 2 and R 4 so that R 4 = R 2 + e 1 .

De manière analogue, comme visible à la figure 6 représentant la coupe B-B de la figure 5, c'est-à-dire une coupe transversale, on peut voir que les courbures C1 et C3 sont parallèles. Dans l'exemple des figures 5 à 7, on remarque qu'en fait les courbures C1 et C3 forment respectivement un rayon unique R1 et R3 de sorte que R3 = R1 + e1.Similarly, as visible in figure 6 representing the BB cup of the figure 5 , i.e. a cross-section, it can be seen that the curvatures C 1 and C 3 are parallel. In the example of Figures 5 to 7 we note that in fact the curvatures C 1 and C 3 respectively form a single radius R 1 and R 3 so that R 3 = R 1 + e 1 .

Par conséquent, la pièce 83 est très galbée et permet, par exemple, de former une glace qui paraît visuellement asymétrique pour s'adapter par exemple à des affichages de pièce d'horlogerie qui ne sont pas centrés par rapport à son boîtier.Therefore, the piece 83 is very curved and allows, for example, to form a glass that appears visually asymmetrical to adapt for example to timepiece displays that are not centered relative to its housing.

Selon la deuxième variante, la pièce d'habillage 103 comporte une surface supérieure 102 et une surface inférieure 104 dont seules la face supérieure est usinée afin d'obtenir une épaisseur sensiblement constante e2 sur ses bords malgré la forme complexe de la pièce 103.According to the second variant, the covering part 103 comprises an upper surface 102 and a lower surface 104 of which only the upper face is machined so as to obtain a substantially constant thickness e 2 on its edges despite the complex shape of the part 103.

Ainsi, la figure 9 est une représentation en perspective de la pièce 103 sensiblement ovoïde. La courbure longitudinale C4 est sécante de la courbure transversale C3 au point O2. On remarque que le point O2 n'est pas centré par rapport à la forme sensiblement ovoïde mais est plus proche de la partie évasée que de la pointe. Cette configuration de la pièce 103 lorsqu'elle est rapportée sur un boîtier de pièce d'horlogerie permet d'accentuer visuellement l'intégration déportée de l'affichage de la pièce d'horlogerie.So, the figure 9 is a perspective representation of the substantially ovoid piece 103. The longitudinal curvature C 4 intersects the transverse curvature C 3 at the point O 2 . Note that the point O 2 is not centered with respect to the substantially ovoid shape but is closer to the flared portion than the tip. This configuration of the piece 103 when it is reported on a timepiece case makes it possible to visually accentuate the remote integration of the display of the timepiece.

Comme visible à la figure 10 représentant la coupe C-C de la figure 9, c'est-à-dire une coupe longitudinale, on peut voir que la courbure C4 est asymétrique. Dans l'exemple des figures 8 à 10, on remarque qu'en fait la courbure C3 forme un rayon unique R3 et que la courbure C4 forme deux rayons R4 et R'4 adjacents. Ainsi, le rayon R4 compris entre le bord de la partie évasée et le point O2 est plus grand que le rayon R'4 compris entre le bord de la pointe et le point O2.As visible at figure 10 representing the CC cup of the figure 9 , that is to say a longitudinal section, it can be seen that the curvature C 4 is asymmetrical. In the example of Figures 8 to 10 it will be noted that in fact the curvature C 3 forms a single radius R 3 and that the curvature C 4 forms two adjacent radii R 4 and R ' 4 . Thus, the radius R 4 between the edge of the flared portion and the point O 2 is greater than the radius R ' 4 between the edge of the tip and the point O 2 .

Par conséquent, la pièce 103 est complexe et permet, par exemple, de former une glace asymétrique pour s'adapter par exemple à des affichages de pièce d'horlogerie qui ne sont pas centrés par rapport à son boîtier. A ce titre, l'épaisseur maximale e3 de la pièce 103 est située à l'aplomb du point fictif O2 et l'épaisseur minimale e2 tout autour du bord de la pièce 103.Therefore, the piece 103 is complex and allows, for example, to form an asymmetrical ice to adapt for example to timepiece displays that are not centered relative to its housing. As such, the maximum thickness e 3 of the piece 103 is located vertically above the imaginary point O 2 and the minimum thickness e 2 all around the edge of the piece 103.

Bien entendu, la présente invention ne se limite pas à l'exemple illustré.
L'étendue de l'invention est définie par le jeu de revendications ci-jointes.Of course, the present invention is not limited to the illustrated example.
The scope of the invention is defined by the attached set of claims.

Claims (13)

  1. System of manufacturing (1, 21, 41, 61) an external piece (3, 23, 43, 63, 83, 103) for a timepiece comprising a securing device (5, 25, 45, 65) including a drum (11, 31, 51, 71), rotatably mounted along a first axis (A1, A3), and carrying at least one blank (3', 23') of said piece, a machining device (7, 27, 47, 67) comprising abrasive means (13, 33, 53, 73) rotatably mounted along a second axis (A2, A4) and intended to machine said at least one blank in order to form a first curvature (C1, C3), the machining device (7, 27, 47, 67) further including a means (15, 35, 55, 75) of moving said second axis (A2, A4) so that the device is movably mounted along a curved directrix to selectively form a second curvature (C2, C4) in said at least one blank and characterised in that said first axis (A1, A3) and said second axis (A2, A4) are perpendicular so that the machining lines intersect.
  2. System (1, 21, 41, 61) according to the preceding claim, characterized in that the directrix of the means of movement is symmetrical so as to form said second curvature on a single radius.
  3. System (1, 21, 41, 61) according to claim 1, characterized in that the directrix of the means of movement is symmetrical so as to form said second curvature on several radii.
  4. System (1) according to any of the preceding claims, characterized in that the drum (11) is a ring against the inner wall of which said at least one blank (3) is secured and in that the abrasive means (13) is moved in the hollow of said ring so as to form first and second concave curvatures (C1, C2).
  5. System (21, 41, 61) according to any of claims 1 to 3, characterized in that the drum (31, 51, 71) is a disc against the outer wall of which said at least one blank (23', 43, 63) is secured and in that the abrasive means (33, 53, 73) are moved in front of said disc so as to form first and second convex curvatures (C3, C4).
  6. System (1, 21, 41, 61) according to any of the preceding claims, characterized in that the abrasive means (13, 33, 53, 73) is formed by a grinding wheel.
  7. System (1, 21, 41, 61) according to any of the preceding claims, characterized in that the means of movement (15, 35, 55, 75) is formed by an actuator moved back-and-forth against the profile of a fixed cam corresponding to said second curvature.
  8. System (1, 21, 41, 61) according to any of claims 1 to 6, characterized in that the means of movement (15, 35, 55, 75) is formed by an automated device programmed to move along said second curvature.
  9. System (1, 21, 41, 61) according to any of the preceding claims, characterized in that said piece is formed from crystallised alumina.
  10. External piece (3, 23, 43, 63, 83, 103) comprising a top surface (82, 102) and a bottom surface (84, 104), at least one of the faces (82, 84, 102, 104) including a longitudinal curvature (C2, C4) and a transverse curvature (C1, C3) which are different and characterized in that at least one of said longitudinal and transverse curvatures (C1, C2, C3, C4) is asymmetrical.
  11. Piece (3, 23, 43, 63, 83, 103) according to the preceding claim, characterized in that the top and bottom surfaces (82, 84, 102, 104) comprise a longitudinal curvature (C2, C4) and a transverse curvature (C1, C3) which are different.
  12. Piece (3, 23, 43, 63, 83, 103) according to claim 10 or 11, characterized in that it is formed from crystallised alumina.
  13. Timepiece characterized in that it includes an external piece (3, 23, 43, 63, 83, 103) according to any of claims 10 to 12.
EP12705111.8A 2011-03-16 2012-02-17 Piece of casing for a time piece and system for manufacturing same Active EP2686135B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12705111.8A EP2686135B1 (en) 2011-03-16 2012-02-17 Piece of casing for a time piece and system for manufacturing same

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP11158456A EP2500134A1 (en) 2011-03-16 2011-03-16 Cover part for a timepiece and system for the manufacturing thereof
PCT/EP2012/052740 WO2012123214A1 (en) 2011-03-16 2012-02-17 Piece of casing for a time piece and system for manufacturing same
EP12705111.8A EP2686135B1 (en) 2011-03-16 2012-02-17 Piece of casing for a time piece and system for manufacturing same

Publications (2)

Publication Number Publication Date
EP2686135A1 EP2686135A1 (en) 2014-01-22
EP2686135B1 true EP2686135B1 (en) 2015-04-08

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP11158456A Withdrawn EP2500134A1 (en) 2011-03-16 2011-03-16 Cover part for a timepiece and system for the manufacturing thereof
EP12705111.8A Active EP2686135B1 (en) 2011-03-16 2012-02-17 Piece of casing for a time piece and system for manufacturing same

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP11158456A Withdrawn EP2500134A1 (en) 2011-03-16 2011-03-16 Cover part for a timepiece and system for the manufacturing thereof

Country Status (7)

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US (1) US9372474B2 (en)
EP (2) EP2500134A1 (en)
JP (1) JP5931094B2 (en)
CN (1) CN103442846B (en)
HK (1) HK1192195A1 (en)
RU (1) RU2590466C2 (en)
WO (1) WO2012123214A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109333178A (en) * 2018-11-12 2019-02-15 上海交通大学 Symmetrical configurations precision dise knife numerically control grinder and method for grinding

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Also Published As

Publication number Publication date
US9372474B2 (en) 2016-06-21
CN103442846B (en) 2016-06-22
WO2012123214A1 (en) 2012-09-20
HK1192195A1 (en) 2014-08-15
EP2500134A1 (en) 2012-09-19
RU2590466C2 (en) 2016-07-10
CN103442846A (en) 2013-12-11
US20130343165A1 (en) 2013-12-26
JP5931094B2 (en) 2016-06-08
RU2013146015A (en) 2015-04-27
EP2686135A1 (en) 2014-01-22
JP2014512974A (en) 2014-05-29

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