EP3418816B1 - Balancier spiral comprenant une section transversale en forme de losange pour un mécanisme d'horlogerie d'un mouvement de montre et procédé de fabrication du balancier spiral - Google Patents

Balancier spiral comprenant une section transversale en forme de losange pour un mécanisme d'horlogerie d'un mouvement de montre et procédé de fabrication du balancier spiral Download PDF

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Publication number
EP3418816B1
EP3418816B1 EP17176933.4A EP17176933A EP3418816B1 EP 3418816 B1 EP3418816 B1 EP 3418816B1 EP 17176933 A EP17176933 A EP 17176933A EP 3418816 B1 EP3418816 B1 EP 3418816B1
Authority
EP
European Patent Office
Prior art keywords
balance spring
diagonal
corners
rhombus
blank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17176933.4A
Other languages
German (de)
English (en)
Other versions
EP3418816A1 (fr
Inventor
Heinrich Wölfle
Bruno Schindler
Michael Streicher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maxon International AG
Original Assignee
Lakeview Innovation Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to EP17176933.4A priority Critical patent/EP3418816B1/fr
Application filed by Lakeview Innovation Ltd filed Critical Lakeview Innovation Ltd
Priority to CN201880041465.8A priority patent/CN110892340B/zh
Priority to PCT/EP2018/066214 priority patent/WO2018234290A1/fr
Priority to JP2019569370A priority patent/JP7148207B2/ja
Priority to KR1020207001518A priority patent/KR102575006B1/ko
Priority to US16/624,795 priority patent/US11397409B2/en
Priority to RU2020101639A priority patent/RU2765407C2/ru
Publication of EP3418816A1 publication Critical patent/EP3418816A1/fr
Application granted granted Critical
Publication of EP3418816B1 publication Critical patent/EP3418816B1/fr
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Anticipated expiration legal-status Critical

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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
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/06—Oscillators with hairsprings, e.g. balance
    • G04B17/066—Manufacture of the spiral spring
    • 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
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/06—Oscillators with hairsprings, e.g. balance

Definitions

  • the present invention relates to a balance spring for a mechanical movement of a watch according to the preamble of independent claim 1.
  • the invention relates to a balance spring for a mechanical movement of a wristwatch or a pocket watch.
  • a balance spring of the generic type is designed as a spiral spring and has a winding cross-section. The winding cross section does not mean the cross section of the complete balance spring but the cross section of a single turn of the balance spring.
  • the balance spring forms together with the so-called escapement the speed regulator of a mechanical movement and therefore directly influences the uniform clocks and the accuracy of the movement.
  • CH 704 686 A1 describes a balance spring, wherein the winding cross-section has four sides.
  • Object of the present invention is to advantageously develop a balance spring of the generic type.
  • a balance spring according to the preamble of independent claim 1 a solution according to the invention the task before, when the winding cross-section of the coil spring has the shape of a rhombus, the rhombus at least four sides, two corners having a first interior angle, two second corners having a second interior angle, a first diagonal connecting the two first corners, and a second diagonal connecting the two second corners, the first diagonal being shorter than the one second diagonal, and wherein the first inner angle is greater than the second inner angle.
  • the present invention offers the advantage that the diamond geometry optimizes the stress distribution and the unidirectional oscillations of the balance spring.
  • the diamond-shaped cross-section also has a self-centering effect on the movement of the balance spring and stabilizes the balance spring in the oscillation plane.
  • the clocking of the movement can thus be precisely defined, in which the geometry of the diamond cross-section is determined accordingly.
  • the first shorter diagonal of the rhombus preferably runs parallel to the plane of extent of Balance spring.
  • the second longer diagonal is thus preferably perpendicular to the plane of extent of the balance spring.
  • the second longer diagonal thus preferably runs parallel to an axis of the spiral.
  • the two second corners of the rhombus interconnected by the second diagonal are trimmed parallel to the first diagonal so that the rhombus has two additional sides.
  • the distance between the two aforementioned additional sides is between 0.05 mm and 0.2 mm.
  • the balance spring according to the invention is particularly suitable for the clockwork of a watch.
  • the two additional sides have a length between 0.01 mm and 0.05 mm. Further preferably, the length of the first diagonal is between 0.03 mm and 0.07 mm.
  • a value between 3 ° and 30 ° has furthermore proven to be particularly advantageous. Further preferably, the second inner angle between 10 ° and 30 °.
  • the production of the balance spring according to the invention is simplified considerably when the transition between the two additional sides and the respective adjacent sides of the rhombus in a further preferred embodiment of the present invention is rounded.
  • the radius of the rounding is further preferably in the range between 0.005 mm and 0.05 mm.
  • the winding cross-section is symmetrical both in relation to the first diagonal of the rhombus and in relation to the second diagonal of the rhombus.
  • the balance spring is made of a ceramic material.
  • a ceramic material This results in a particularly precise spring properties.
  • this choice of material allows a particularly simple variation of the winding cross section and thus a particularly simple variation in the production.
  • Particularly suitable for the production of the balance spring according to the invention is a glass ceramic.
  • a suitable glass ceramic is, for example, the glass ceramic material marketed by Schott AG under the trade name Zerodur.
  • the balance spring can also be made of an oxide ceramic, for example of zirconium oxide.
  • the present invention also provides a method of making the balance spring of the present invention.
  • the balance spring is produced from a blank, wherein the blank consists of a ceramic material and is structured by means of a selective laser ablation process in such a way that the desired coil cross section is established.
  • the method according to the invention offers the advantage that balance springs with different winding cross sections and thus also different spring properties can be produced from one and the same basic body. An expensive and cost-intensive production of different molds is eliminated.
  • the blank is preferably a disk. Further preferably, the disc is circular. Further preferably, the blank has a thickness of 0.1 mm to 0.25 mm.
  • the blank consists of a ceramic and preferably of a glass ceramic.
  • the blank may consist of the material sold by Schott AG under the brand name Zerodur.
  • the blank can also consist of an oxide ceramic. In particular zirconium oxide is suitable here.
  • the blank can be produced by injection molding.
  • a first V-shaped groove is introduced on a first side of the blank by means of laser, wherein on the opposite second side of the blank also by means of a second second V-shaped groove is introduced, such, the first and second groove congruent superimposed and together form an opening that separates individual turns of the coil spring from each other.
  • first and second grooves are successively introduced into the two opposite sides of the blank, wherein the blank after manufacture the first groove is simply turned, so that the second groove can be introduced with one and the same laser device.
  • the depth of the first groove is preferably slightly more than half the material thickness of the blank used, so that the breakthrough can be generated in a simple manner by the second groove is introduced at least to half the material thickness of the blank in the blank.
  • an ultrashort pulse laser is used to carry out the selective laser ablation process. This allows a precise and residue-free material transfer without problematic heat transfer.
  • the invention further provides a movement for a small watch with a balance spring according to the invention.
  • FIG. 1 shows a plan view of an embodiment of a balance spring according to the invention 1.
  • the spiral shape of the balance spring is clearly visible in this view.
  • the winding cross section of the balance spring 1 is the same over the entire length of the spring body. Merely by way of example was in FIG. 1 a section plane II drawn. The associated winding cross section is in FIG. 2 shown. As the figure shows, the winding cross-section 2 essentially has the shape of a rhombus.
  • the basic shape of the diamond has four sides 3, two first corners 4 with a first inner angle ⁇ , two second corners 5 with an inner angle ⁇ , a first diagonal 6 connecting the two first corners, and a second diagonal 7 connecting the two connecting the two corners together.
  • the first diagonal 6 of the basic shape is shorter than the second diagonal 7.
  • the actual winding cross-section results only by cutting off the two second corners 5 parallel to the first diagonal 6.
  • the actual winding cross-section therefore does not have four but a total of six sides.
  • the two additional pages, which result from cutting off the diamond basic body, are designated by the reference numeral 8 in the drawing.
  • the distance 9 between the two additional sides 8 according to the invention is advantageously between 0.05 mm and 0.2 mm.
  • the two additional sides 8 further preferably have a length between 0.01 mm and 0.05 mm.
  • the length of the first diagonal is more preferably between 0.03 mm and 0.07 mm.
  • the second inner angle ⁇ is more preferably between 3 ° and 30 °. In the embodiment shown, the second inner angle is about 30 °.
  • the transition between the two additional sides 8 and the respective adjacent sides 3 of the rhombus is rounded.
  • the radius R of the rounding is clearly in FIG. 3 can be seen and is between 0.005 mm and 0.05 mm.
  • the two opposite second corners 5 are each cut at the same height, so that there is a winding cross section, the is performed symmetrically with respect to both the first diagonal 6 and with respect to the second diagonal 7.
  • the balance spring is made of a blank, which consists of a ceramic material.
  • a blank made of a glass ceramic is used.
  • the blank is a circular disc 10, which in an oblique view in FIG. 4 is shown.
  • the disk 10 is patterned by means of a selective laser ablation process such that the desired winding cross-section results.
  • a first V-shaped groove 13 is first introduced into the top 16 of the disc 10 by the laser beam 12 of a ultrashort pulse laser 11.
  • the groove 13 is in both FIG. 5 as well as in the sectional view FIG. 6 to recognize.
  • the V-shaped groove 13 marks the space between the later turns of the balance spring and is therefore itself formed spirally.
  • the depth of the groove is slightly more than half the material thickness of the disc 10.
  • the groove base is therefore in FIG. 6 below the line 15 which marks the center of the ceramic disc 10.
  • the disk 10 After the first groove 13 has been introduced into the upper side 16 of the disk 10, the disk 10 is turned, so that with the laser 11, the bottom 17 of the disk can be structured. In the bottom 17, a V-shaped groove is now also introduced by means of the laser.
  • This second V-shaped groove is in FIG. 7 indicated by dashed lines and provided with the reference numeral 14.
  • the two V-shaped grooves 13 and 14 are congruent and together form an opening which separates the individual turns of the spiral balance spring from each other.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Springs (AREA)

Claims (16)

  1. Ressort de balancier (1) destiné à un mécanisme d'horlogerie d'une montre, caractérisé en ce que le ressort de balancier est réalisé sous la forme d'un ressort hélicoïdal et présente une section d'enroulement transversale (2), caractérisé en ce que la section d'enroulement transversale (2) du ressort hélicoïdal a la forme d'un losange, le losange comportant au moins quatre côtés (3), deux premiers coins (4) formant un premier angle interne α, deux deuxièmes coins (5) formant un deuxième angle interne β, une première diagonale (6) qui relie les deux premiers coins entre eux et une deuxième diagonale (7) qui relie les deux deuxièmes coins entre eux, la première diagonale étant plus courte que la deuxième diagonale et le premier angle interne étant plus grand que le deuxième angle interne.
  2. Ressort de balancier (1) selon la revendication 1, caractérisé en ce que les deux deuxièmes coins (5) qui sont reliés entre eux par la deuxième diagonale (7), sont coupés parallèlement à la première diagonale (6) de sorte que le losange ait deux côtés supplémentaires (8).
  3. Ressort de balancier (1) selon la revendication 2, caractérisé en ce que la distance (9) entre les deux côtés supplémentaires (8) est comprise entre 0,05 mm et 0,2 mm.
  4. Ressort de balancier (1) selon la revendication 2 ou 3, caractérisé en ce que les deux côtés supplémentaires (8) ont une longueur comprise entre 0,01 mm et 0,05 mm.
  5. Ressort de balancier (1) selon la revendication 1, caractérisé en ce que la longueur de la première diagonale (6) est comprise entre 0,03 mm et 0,07 mm.
  6. Ressort de balancier (1) selon l'une des revendications 2 à 5, caractérisé en ce que le deuxième angle interne β est compris entre 3° et 30°.
  7. Ressort de balancier (1) selon la revendication 6, caractérisé en ce que le deuxième angle interne β est compris entre 10° et 30°.
  8. Ressort de balancier (1) selon l'une des revendications 2 à 7, caractérisé en ce que la transition entre les deux côtés supplémentaires (8) et les côtés adjacents (3) du losange est arrondie, le rayon (R) de l'arrondi étant compris entre 0,005 mm et 0,05 mm.
  9. Ressort de balancier (1) selon l'une des revendications 1 à 8, caractérisé en ce que la section d'enroulement transversale est symétrique par rapport à la première diagonale (6) du losange et donc par rapport à la deuxième diagonale (7) du losange.
  10. Ressort de balancier (1) selon la revendication 1, caractérisé en ce que le ressort de balancier (1) est en un matériau céramique, de préférence une vitrocéramique.
  11. Mécanisme d'horlogerie pour montre pourvu d'un ressort de balancier (1), caractérisé par un ressort de balancier (1) selon l'une des revendications 1 à 10.
  12. Procédé de fabrication d'un ressort de balancier (1) selon les revendications 1 à 10, le ressort de balancier étant réalisé sous la forme d'un ressort hélicoïdal et présente une section d'enroulement transversale (2), caractérisé en ce que le ressort de balancier est réalisé à partir d'une pièce brute (10), la pièce brute étant en un matériau céramique et étant structurée à l'aide d'un procédé d'ablation par laser de sorte que la section d'enroulement transversale du ressort hélicoïdal ait la forme d'un losange, le losange comportant au moins quatre côtés (3), deux premiers coins (4) formant un premier angle interne α, deux deuxièmes coins (5) formant un deuxième angle interne β, une première diagonale (6) qui relie les deux premiers coins entre eux et une deuxième diagonale (7) qui relie les deux deuxièmes coins entre eux, la première diagonale étant plus courte que la deuxième diagonale et le premier angle interne étant plus grand que le deuxième angle interne.
  13. Procédé selon la revendication 12, caractérisé en ce que la pièce brute (10) est un disque.
  14. Procédé selon la revendication 12 ou 13, caractérisé en ce que la pièce brute (10) a une épaisseur de 0,1 mm à 0,25 mm.
  15. Procédé selon l'une des revendications 12 à 14, caractérisé en ce qu'une première rainure (13) en forme de V est ménagée par laser sur un premier côté (16) de la pièce brute (10), une deuxième rainure (14) en forme de V étant ménagée également par laser sur le deuxième côté opposé (17) de la pièce brute (10) de sorte que les première et deuxième rainures (13, 14) se superposent de manière à coïncider et forment conjointement un passage qui sépare les enroulements individuels du ressort hélicoïdal l'un de l'autre.
  16. Procédé selon l'une des revendications 12 à 15, caractérisé en ce qu'un laser à impulsions ultracourtes (11) est utilisé pour mettre en oeuvre le processus d'ablation sélective par laser.
EP17176933.4A 2017-06-20 2017-06-20 Balancier spiral comprenant une section transversale en forme de losange pour un mécanisme d'horlogerie d'un mouvement de montre et procédé de fabrication du balancier spiral Active EP3418816B1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP17176933.4A EP3418816B1 (fr) 2017-06-20 2017-06-20 Balancier spiral comprenant une section transversale en forme de losange pour un mécanisme d'horlogerie d'un mouvement de montre et procédé de fabrication du balancier spiral
PCT/EP2018/066214 WO2018234290A1 (fr) 2017-06-20 2018-06-19 Ressort de balancier à section transversale en forme de losange, destiné à un mouvement mécanique d'une pièce d'horlogerie de petite taille, ainsi que procédé servant à fabriquer le ressort de balancier
JP2019569370A JP7148207B2 (ja) 2017-06-20 2018-06-19 時計の機械式ムーブメントの為に菱形断面を備えたバランスバネとバランスバネの製造方法
KR1020207001518A KR102575006B1 (ko) 2017-06-20 2018-06-19 시계의 기계적 운동을 위한 마름모꼴 단면을 갖는 밸런스 스프링 및 밸런스 스프링의 제조 방법
CN201880041465.8A CN110892340B (zh) 2017-06-20 2018-06-19 用于小型钟表的机械钟表机构的平衡弹簧以及其制造方法
US16/624,795 US11397409B2 (en) 2017-06-20 2018-06-19 Balance spring with rhomboidal cross-section for a mechanical movement of a watch, and method for producing the balance spring
RU2020101639A RU2765407C2 (ru) 2017-06-20 2018-06-19 Пружина баланса с ромбовидным поперечным сечением для механического часового механизма малых часов, а также способ изготовления пружины баланса

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17176933.4A EP3418816B1 (fr) 2017-06-20 2017-06-20 Balancier spiral comprenant une section transversale en forme de losange pour un mécanisme d'horlogerie d'un mouvement de montre et procédé de fabrication du balancier spiral

Publications (2)

Publication Number Publication Date
EP3418816A1 EP3418816A1 (fr) 2018-12-26
EP3418816B1 true EP3418816B1 (fr) 2019-10-16

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EP17176933.4A Active EP3418816B1 (fr) 2017-06-20 2017-06-20 Balancier spiral comprenant une section transversale en forme de losange pour un mécanisme d'horlogerie d'un mouvement de montre et procédé de fabrication du balancier spiral

Country Status (7)

Country Link
US (1) US11397409B2 (fr)
EP (1) EP3418816B1 (fr)
JP (1) JP7148207B2 (fr)
KR (1) KR102575006B1 (fr)
CN (1) CN110892340B (fr)
RU (1) RU2765407C2 (fr)
WO (1) WO2018234290A1 (fr)

Family Cites Families (15)

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Publication number Priority date Publication date Assignee Title
CH327796A (fr) * 1954-02-22 1958-02-15 Horlogerie Suisse S A Asuag Spiral plat
DE102008029429A1 (de) 2007-10-18 2009-04-23 Konrad Damasko Verfahren zum Herstellen von mechanischen Funktionselementen für Uhrwerke sowie nach diesem Verfahren hergestelltes Funktionselement
CH708272B1 (fr) 2009-09-07 2015-01-15 Manuf Et Fabrique De Montres Et Chronomètres Ulysse Nardin Le Locle S A Ressort spiral de mouvement de montre.
CH701783B1 (fr) * 2009-09-07 2015-01-30 Manuf Et Fabrique De Montres Et Chronomètres Ulysse Nardin Le Locle S A Ressort spiral de mouvement de montre.
US8562206B2 (en) * 2010-07-12 2013-10-22 Rolex S.A. Hairspring for timepiece hairspring-balance oscillator, and method of manufacture thereof
EP2469353A1 (fr) 2010-12-22 2012-06-27 ETA SA Manufacture Horlogère Suisse Assemblage d'une pièce ne comportant pas de domaine plastique
CH704686B1 (fr) * 2011-03-23 2016-06-30 Lvmh Swiss Mft Sa Ressort horloger pour montre-bracelet.
EP2597536A1 (fr) * 2011-11-25 2013-05-29 CSEM Centre Suisse d'Electronique et de Microtechnique SA - Recherche et Développement Ressort spiral amélioré et procédé de fabrication dudit ressort spiral
EP2685325B1 (fr) * 2012-07-11 2016-04-06 Diamaze Microtechnology S.A. Ressort spiralé, procédé de fabrication, possibilités d'application ainsi qu'un entraînement micro-mécanique
EP2871534B1 (fr) 2013-11-06 2017-01-04 ETA SA Manufacture Horlogère Suisse Mobile d'horlogerie à roues unidirectionnelles
EP2871537B1 (fr) 2013-11-06 2017-01-04 ETA SA Manufacture Horlogère Suisse Montre à réserve de marche améliorée
EP2908183B1 (fr) * 2014-02-14 2018-04-18 ETA SA Manufacture Horlogère Suisse Spiral d'horlogerie
CN104503215A (zh) * 2014-11-05 2015-04-08 王伟 一种手表表扣与其配备的表壳和共同装配的手表
EP3081996B1 (fr) * 2015-04-16 2019-02-27 Montres Breguet S.A. Spiral en materiau micro-usinable avec correction d'isochronisme
WO2017191533A1 (fr) * 2016-05-02 2017-11-09 Patek Philippe Sa Geneve Spiral d'horlogerie

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
RU2020101639A (ru) 2021-07-20
JP7148207B2 (ja) 2022-10-05
RU2765407C2 (ru) 2022-01-28
CN110892340B (zh) 2021-08-24
KR20200019967A (ko) 2020-02-25
US20200192293A1 (en) 2020-06-18
EP3418816A1 (fr) 2018-12-26
RU2020101639A3 (fr) 2021-11-09
KR102575006B1 (ko) 2023-09-06
WO2018234290A1 (fr) 2018-12-27
CN110892340A (zh) 2020-03-17
US11397409B2 (en) 2022-07-26
JP2020524783A (ja) 2020-08-20

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