EP3502784B1 - Uhrresonator mit flexibler führung - Google Patents

Uhrresonator mit flexibler führung Download PDF

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Publication number
EP3502784B1
EP3502784B1 EP18201466.2A EP18201466A EP3502784B1 EP 3502784 B1 EP3502784 B1 EP 3502784B1 EP 18201466 A EP18201466 A EP 18201466A EP 3502784 B1 EP3502784 B1 EP 3502784B1
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EP
European Patent Office
Prior art keywords
resonator
felloe
timepiece
pin
elastic member
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EP18201466.2A
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English (en)
French (fr)
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EP3502784A1 (de
Inventor
Stéphane OES
Anthony Krüttli
David Chabloz
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Patek Philippe SA Geneve
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Patek Philippe SA Geneve
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Publication of EP3502784A1 publication Critical patent/EP3502784A1/de
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    • 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
    • G04B17/045—Oscillators acting by spring tension with oscillating blade springs
    • 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
    • G04B17/063—Balance construction
    • 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
    • G04B15/00—Escapements
    • G04B15/06—Free escapements
    • G04B15/08—Lever escapements

Definitions

  • the present invention relates to a timepiece resonator with flexible guidance intended to serve as a time base for a timepiece movement, like a balance-spring.
  • flexible guide resonators are advantageous in that they have no physical axis of rotation and therefore eliminate the friction generated by the rotation of such an axis.
  • Flexible guide resonators are known, such as that described in the patent EP 1736838 or the Zenith Defy Lab resonator, whose oscillations are maintained by a specific exhaust connected to the resonator by flexible blades.
  • a flexible guide resonator comprising, in the same plane, a central rigid part, an intermediate rigid part, a rigid anchoring part, first elastic return means forming an elastic connection between the central rigid part and the rigid intermediate part and second elastic return means forming an elastic connection between the rigid intermediate part and the rigid anchoring part.
  • a pin is connected to the central rigid part to cooperate with the fork of an exhaust anchor.
  • This resonator is very specific and the use of such a dowel connected to a central rigid part does not seem applicable to other types of resonators with flexible guidance such as the resonators with crossed blades.
  • the anchor is located between two blades of the first elastic return means and has little room to perform its oscillations, which creates the risk of collision liable to disturb the operation of the resonator.
  • the state of the art does not offer a resonator with flexible guidance which can be maintained by a conventional exhaust in an optimized manner.
  • the present invention aims to satisfy, at least in part, this need.
  • a timepiece resonator comprising a base, a serge, an elastic member and a dowel, the elastic member connecting the serge to the base and guiding the oscillations of the serge relative to the base around a virtual axis of rotation, the dowel being intended to cooperate with a fork of an exhaust for the maintenance of said oscillations, characterized in that the dowel is carried by a free end of a support member extending from the serge towards the virtual axis of rotation and forming with the serge a rigid part.
  • This arrangement allows direct interaction between the escapement and the movable rigid part of the resonator, as for the maintenance of the oscillations of a balance-spring.
  • the support member makes it possible to place the dowel at a location close to the virtual axis of rotation which is favorable in particular for the lifting angle and / or for reducing the disturbances linked to vertical shocks.
  • the pin is located, at least in part, outside the thickness of the twill to be able to cooperate with the fork of the exhaust without possible collision between the resonator and the exhaust.
  • the present invention further provides a timepiece oscillator comprising the resonator defined above and an escapement, as well as a method of manufacturing the resonator.
  • a resonator 1 intended to form the time base of a watch movement, in particular of a wristwatch movement, comprises a base 2, a serge 3 and an elastic member 4 connecting serge 3 to base 2.
  • the base 2 can be in one part, as shown, or in two separate parts. It is intended to be fixed on a fixed or mobile support such as the movement stage or a tourbillon cage.
  • the twill 3 is suspended from the base 2 by the elastic member 4, that is to say is held only by the elastic member 4. It is preferably continuous, to promote its inertia with respect to its mass , but could be in the form of an interrupted ring.
  • the serge 3 is coplanar with the base 2 and surrounds it, at least in part.
  • the elastic member 4 serves as a guide means guiding the serge 3 in rotation relative to the base 2 about a virtual axis of rotation A corresponding substantially to the geometric axis of the serge 3.
  • the elastic member 4 also serves of elastic return means recalling the serge 3 in an angular position of rest relative to the base 2.
  • the elastic member 4 is of the type with separate crossed blades: it comprises two elastic blades 4a, 4b intersecting in plan view from above or from below the resonator 1 but extending in two different parallel planes for meet without contact.
  • the ends of each of these blades 4a, 4b are respectively joined to the base 2 and to the twill 3.
  • the intersection between these blades 4a, 4b defines the virtual axis of rotation A.
  • This type of flexible guidance is advantageous in that 'it has a low stiffness and allows a relatively large amplitude of oscillation of the serge 3.
  • the base 2 can be as described in the patent application WO 2017/055983 of the applicant, to allow adjustment of the position of the crossing point of the blades 4a, 4b.
  • a support member 5 consisting of one or more rigid arms 5a, 5b extends, preferably in the plane of the serge 3, preferably radially, from the inner face 3a of the serge 3 towards the virtual axis of rotation A to a free end 5c.
  • the support member 5 consists of two rigid arms 5a, 5b which meet to form the free end 5c.
  • This free end 5c carries a pin or ellipse 6 whose axis is parallel to the virtual axis of rotation A and perpendicular to the plane of the serge 3.
  • the pin 6 has the conventional form of a half -cylinder, but it could have another shape. As visible at the figure 2 , the pin 6 protrudes from the thickness e of the serge 3, more precisely from the plane defined by the lower face 3b of the serge 3.
  • the part of the pin 6 located outside the thickness e cooperates in a conventional manner per se with the fork 7a of an escape anchor 7, for example of a Swiss anchor.
  • this anchor 7 located under the resonator 1 and which interacts with the escape wheel 8a of an exhaust mobile 8 itself located under the resonator 1 and its serge 3.
  • the anchor 7 and the escape wheel 8 do not interfere with the oscillations of the rim 3 whatever the amplitude of these oscillations, which can therefore be high.
  • the direct interaction between the exhaust 7, 8 and the rigid movable part of the resonator 1, comprising the twill 3, the support member 5 and the pin 6, contributes to obtaining good efficiency.
  • the radial length of the support member 5 is chosen in particular as a function of the lifting angle desired for the resonator 1, that is to say the angle of the twill 3 during which the pin 6 is in contact with the fork 7a.
  • the lifting angle desired for the resonator 1 that is to say the angle of the twill 3 during which the pin 6 is in contact with the fork 7a.
  • placing the pin 6 near the virtual axis of rotation A increases the lifting angle while moving it away from the virtual axis of rotation A decreases the angle of lifted.
  • a Swiss anchor escapement if one wishes to promote efficiency, it is generally advantageous to have a relatively large lifting angle. If, on the other hand, we wish to promote chronometry, a small angle of lift is generally preferable.
  • the stiffness of the flexible guide and the frequency are high compared to the stiffness of the balance spring and the frequency of a balance spring, so that the disturbances caused by the exhaust are much weaker.
  • the amplitude of oscillation of the resonator is greater than the lifting angle.
  • the lifting angle is two times smaller than the amplitude of oscillation of the resonator 1 and the frequency of oscillation is several tens of Hertz.
  • the pin 6 is crossed symmetrically by an axis of symmetry D1 of the elastic member 4, allowing the resonator 1 to be maintained symmetrically, the elastic member 4 being stressed identically during the two half-waves of an oscillation. This feature improves timing.
  • the pin 6 is located on the same side of a straight line D2, perpendicular to the axis of symmetry D1 and intersecting the virtual axis of rotation A, that all the attachment points of the elastic member 4 to the rim 3, the base 2 being, it, located on the other side of this straight line D2.
  • said attachment points are two in number and designated by 4c, 4d.
  • the pin 6 is located in the area of the resonator 1 which moves the least in the event of a vertical shock (parallel to the virtual axis of rotation A) received by the resonator 1, and its cooperation with the fork 7a does not will not, or will be little, affected.
  • the resonator 1 is balanced in the sense that the center of mass of its movable rigid part 3, 5, 6 is situated substantially on the virtual axis of rotation A.
  • a recess 3c (cf. figure 1 ) is made in the lower face 3b of the rim 3, in the area of the rim 3 from which the support member extends 5.
  • the support member 5 is preferably symmetrical with respect to the axis of symmetry D1 of the elastic member 4 in plan view from above or from below the resonator 1 and when the twill 3 is in its rest position (cf. figure 3 ).
  • a resonator 1 is shown according to a second embodiment of the invention.
  • the resonator 1 according to this second embodiment differs from that according to the first embodiment essentially by the shape of its support member 5, of its base 2 and of its twill 3.
  • the support member 5 here consists of two arms 5a, 5b, of shape different from that of the first embodiment, and of a third arm 5e which connects these two arms 5a, 5b.
  • the characteristics of symmetry described above in relation to the first embodiment are found in the second embodiment.
  • the axis of rotation 7b of the anchor 7 passes through the central opening defined by the serge 3, in other words is surrounded by the serge 3, as is visible to Figures 5 to 8 .
  • This characteristic makes the oscillator 1, 7, 8 compact in plan view from above or from below while allowing the anchor 7 to have a long axis of rotation 7b, longer than that of the anchors interacting with balance-springs .
  • a long axis of rotation improves the guiding of the anchor, making it less prone to displacements out of its plane.
  • the axis of rotation 7b of the anchor 7 has its pivots which rotate in bearings 9a, 9b provided respectively in the plate 10 of the watch movement and in an oscillator bridge 11 located above the resonator 1 and fixed by screws 11a to the plate 10.
  • This mounting of the anchor 7 between the plate 10 and the oscillator bridge 11 avoids the use of the traditional anchor bridge interposed between the plate and the resonator.
  • the anchor 7 and the resonator 1 can thus be close to each other in the direction of the height (direction of the virtual axis of rotation A), allowing the pin 6 to be shorter.
  • a short dowel 6 reduces the risk of the resonator 1 tilting around the axis BB of the figure 7 during the contacts between the pin 6 and the fork 7a as well as the effect of a possible defect of perpendicularity of the pin 6.
  • the positioning of the pin 6 in the fork 7a and the operation of the oscillator can therefore be particularly precise .
  • the axis of rotation 7b of the anchor 7 crosses the central opening of the serge 3 between the arms 5a, 5b of the support member 5.
  • the axis 7b can serve as a stop to these arms 5a, 5b to allow oscillations of the serge 3 only within a predetermined angular range and prevent an excessively large amplitude of oscillation of the serge 3 or that a shock leads to exceeding the elastic limit of l elastic body 4.
  • the anchor 7 used in the present invention can be replaced by another type of fork-type energy transmission member able to communicate pulses of mechanical energy to the ankle 6.
  • the anchor 7 can for example be replaced by the trigger rocker of a percussion exhaust as described in the patent application WO 2018/002778 of the plaintiff.
  • the base 2 of the resonator 1 is mounted on the plate 10 via a bridge 12. As a variant, however, it could be mounted directly on the plate 10.
  • the attachment of the base 2 and of the bridge 12 to the plate 10 is provided by positioning pins 13 and retaining screws 14.
  • the bearings 9b and 9a in which the pivots of the axis of rotation 7b of the anchor 7 rotate are provided in the bridges 11 and 12 respectively, allowing these bridges to the anchor 7 and the resonator 1 to form together a module, a module of which the exhaust mobile 8 can also be part by also pivoting in the bridges 11, 12.
  • stops 15, 16 integral with the oscillator bridge 11 limit the undesirable displacements of the twill 3 during impacts.
  • the stop 15 is arranged to act on the clamp 3 in several directions of translation of the plane of the resonator 1 and in the direction of the height.
  • the stop 16 is arranged to act on the serge 3 in the height direction.
  • the stops 15, 16 are driven into the oscillator bridge 11 and can therefore be adjusted in height to ensure an ideal operating clearance.
  • the stops 15, 16 could however be in one piece with the oscillator bridge 11.
  • the clamp 3 of the resonator 1 according to the invention can be fitted with weights 17 allowing the adjustment of the moment of inertia of the mobile rigid part 3, 5, 6.
  • the resonator 1 can be entirely monolithic and produced for example from silicon or any other suitable material according to the deep reactive ion etching technique known as "DRIE" (Deep Reactive Ion Etching), nickel, nickel alloy or any other suitable material according to the LIGA technique (lithography, electroplating, molding), in steel, copper-beryllium, nickel silver or other metal alloy by milling, electroerosion or by 3D printing, in metallic glass by molding, or in glass, sapphire or any other suitable material according to the laser micro-structuring technique coupled with a chemical attack (for example FEMTOPRINT®).
  • DRIE Deep reactive ion etching technique
  • LIGA lithium-reactive Ion Etching
  • the coplanar parts that are the base 2, the twill 3, the elastic member 4 and the member support 5 are made together so as to form a monolithic part, for example according to one of the abovementioned techniques such as the DRIE or LIGA technique, then the dowel 6, made of the same material or another material, is assembled to the 'support member 5.
  • the pin 6 can be introduced into a hole 5d previously formed in the end 5c of the support member 5 and be fixed for example by gluing or brazing.
  • the assembly 2, 3, 4, 5 and the pin 6 are both made of silicon.
  • the blades 4a, 4b forming the elastic member 4 are preferably each oriented in a crystal direction in which the modulus of elasticity is the lowest.
  • the plates 4a, 4b are each oriented in a crystal direction of the family ⁇ 100>. In this way, for a given stiffness of the elastic member 4, the thickness of the blades 4a, 4b can be greater, which facilitates manufacture.
  • All or part of the surface of the resonator 1 can be covered with one or more layers.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)

Claims (20)

  1. Uhrresonator (1), der eine Basis (2), einen Fußkreis (3), ein elastisches Organ (4) und einen Stift (6) umfasst, wobei das elastische Organ (4) den Fußkreis (3) mit der Basis (2) verbindet und die Schwingungen des Fußkreises (3) in Bezug auf die Basis (2) um eine virtuelle Drehachse (A) führt, wobei der Stift (6) dazu bestimmt ist, mit einer Gabel (7a) einer Hemmung (7, 8) für den Erhalt der Schwingungen zusammenzuwirken, dadurch gekennzeichnet, dass der Stift (6) von einem freien Ende (5c) eines Stützorgans (5) getragen wird, das sich ausgehend von dem Fußkreis (3) hin zur virtuellen Drehachse (A) erstreckt und mit dem Fußkreis (3) einen starren Teil bildet.
  2. Uhrresonator (1) nach Anspruch 1, dadurch gekennzeichnet, dass der Stift (6) sich zumindest teilweise außerhalb der Dicke (e) des Fußkreises (3) befindet.
  3. Uhrresonator (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Stützorgan (5) mit dem Fußkreis (3) monolithisch ist.
  4. Uhrresonator (1) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Basis (2) und das elastische Organ (4) mit dem Fußkreis (3) monolithisch sind.
  5. Uhrresonator (1) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Stift (6) in einem Loch (5d) des Stützorgans (5) befestigt ist.
  6. Uhrresonator (1) nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass in der Draufsicht auf den Resonator (1) von oben oder von unten und wenn der Fußkreis (3) sich in einer Ruheposition in Bezug auf die Basis (2) befindet, der Stift (6) symmetrisch von einer Symmetrieachse (D1) des elastischen Organs (4) durchquert wird.
  7. Uhrresonator (1) nach Anspruch 6, dadurch gekennzeichnet, dass in der Draufsicht auf den Resonator (1) von oben oder von unten und wenn der Fußkreis (3) sich in der Ruheposition in Bezug auf die Basis (2) befindet, das Stützorgan (5) in Bezug auf die Symmetrieachse (D1) symmetrisch ist.
  8. Uhrresonator (1) nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Fußkreis (3) eine Aushöhlung (3c) umfasst, die das Ungleichgewicht kompensiert, das das Stützorgan (5) und der Stift (6) mit sich bringen.
  9. Uhrresonator (1) nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass in der Draufsicht auf den Resonator (1) von oben oder von unten und wenn der Fußkreis (3) sich in einer Ruheposition in Bezug auf die Basis (2) befindet, der Stift (6) sich auf der gleichen Seite einer Geraden (D2), die senkrecht zu einer Symmetrieachse (D1) des elastischen Organs (4) ist und die virtuelle Drehachse (A) schneidet, wie alle Anbringungspunkte (4c, 4d) des elastischen Organs (4) an dem Fußkreis (3) befindet.
  10. Uhrresonator (1) nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass der Fußkreis (3) ununterbrochen ist.
  11. Uhrresonator (1) nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass das elastische Organ (4) eine erste und eine zweite gekreuzte elastische Klinge (4a, 4b) umfasst, die sich in unterschiedlichen parallelen Ebenen erstrecken.
  12. Uhrresonator (1) nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass das elastische Organ (4) aus einem Material hergestellt ist, das ein anisotropes Elastizitätsmodul aufweist, und elastische Klingen (4a, 4b) umfasst, die sich jeweils in eine kristallographische Richtung des Materials erstrecken, in der das Elastizitätsmodul am schwächsten ist.
  13. Uhroszillator, der einen Resonator (1) nach einem der Ansprüche 1 bis 12 und eine Hemmung (7, 8) umfasst, wobei die Hemmung (7, 8) eine Gabel (7a) umfasst, die gestaltet ist, um mit dem Stift (6) zusammenzuwirken.
  14. Uhroszillator nach Anspruch 13, dadurch gekennzeichnet, dass die Gabel (7a) sich in einer Ebene befindet, die sich von derjenigen des Fußkreises (3) unterscheidet.
  15. Uhroszillator nach Anspruch 14, dadurch gekennzeichnet, dass die Drehachse (7b) der Gabel (7a) zumindest teilweise von dem Fußkreis (3) umgeben ist.
  16. Uhroszillator nach Anspruch 15, dadurch gekennzeichnet, dass die Drehachse (7b) der Gabel (7a) gestaltet ist, um als Anschlag für das Stützorgan (5) in beiden Drehrichtungen des Fußkreises (3) dienen zu können, um ein Überschreiten der Elastizitätsgrenze des elastischen Organs (4) zu verhindern.
  17. Uhroszillator nach Anspruch 15 oder 16, dadurch gekennzeichnet, dass der Resonator (1) sich zwischen einer Brücke (11) und der Gabel (7a) befindet, und dadurch, dass einer von den zwei Zapfen der Drehachse (7b) der Gabel (7a) gestaltet ist, um sich in dieser Brücke (11) zu drehen.
  18. Uhroszillator nach Anspruch 17, dadurch gekennzeichnet, dass die Brücke (11) mindestens einen Anschlag (15, 16) trägt, der das Begrenzen von unerwünschten Verlagerungen des Fußkreises (3) ermöglicht.
  19. Uhroszillator nach einem der Ansprüche 14 bis 18, dadurch gekennzeichnet, dass die Gabel (7a) einen Teil eines Ankers (7) bildet, der sich in der Ebene befindet, die sich von derjenigen des Fußkreises (3) unterscheidet.
  20. Verfahren zur Herstellung eines Uhroszillators (1) nach einem der Ansprüche 1 bis 12, das einen ersten Schritt, der darin besteht, einerseits ein monolithisches Teil, das die Basis (2), den Fußkreis (3), das elastische Organ (4) und das Stützorgan (5) umfasst, und andererseits den Stift (6) herzustellen, und einen zweiten Schritt umfasst, der darin besteht, das monolithische Teil und den Stift (6) zusammenzubauen.
EP18201466.2A 2017-12-22 2018-10-19 Uhrresonator mit flexibler führung Active EP3502784B1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3654109B1 (de) 2018-11-13 2021-03-31 Patek Philippe SA Genève Uhr, die zwei energiequellen besitzt
EP3997525A1 (de) * 2019-07-12 2022-05-18 Patek Philippe SA Genève Verfahren zur einstellung eines flexibel schwenkbaren taktoszillators
EP3812842B1 (de) * 2019-10-24 2023-11-29 The Swatch Group Research and Development Ltd Schwenkbare führungsvorrichtung für eine schwenkbare masse, und resonatormechanismus einer uhr
EP3862818A1 (de) 2020-02-06 2021-08-11 Patek Philippe SA Genève Armband, die einen aufziehmechanismus umfasst
EP4250019A1 (de) 2022-03-21 2023-09-27 Patek Philippe SA Genève Uhr-oszillator für ein ultraflaches uhrwerk
EP4286959A1 (de) 2022-06-02 2023-12-06 Patek Philippe SA Genève Oszillator einer uhr mit flexiblem zapfen
EP4310603A1 (de) 2022-07-18 2024-01-24 Patek Philippe SA Genève Uhrwerk

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JP5551312B2 (ja) * 2010-07-19 2014-07-16 ニヴァロックス−ファー ソシエテ アノニム 弾性ピボット及びエネルギ伝達のための可動要素を有する発振機構
EP2990885B1 (de) * 2013-12-23 2017-07-26 ETA SA Manufacture Horlogère Suisse Mechanisches Uhrwerk mit magnetischem Hemmungsmechanismus
EP3032352A1 (de) * 2014-12-09 2016-06-15 LVMH Swiss Manufactures SA Uhrregler, Uhrwerk und Uhr mit solch einem Regler

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