EP3470932B1 - Oszillator für uhrwerk - Google Patents

Oszillator für uhrwerk Download PDF

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Publication number
EP3470932B1
EP3470932B1 EP18198921.1A EP18198921A EP3470932B1 EP 3470932 B1 EP3470932 B1 EP 3470932B1 EP 18198921 A EP18198921 A EP 18198921A EP 3470932 B1 EP3470932 B1 EP 3470932B1
Authority
EP
European Patent Office
Prior art keywords
balance
oscillator
bridge
bearing
balance staff
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
EP18198921.1A
Other languages
English (en)
French (fr)
Other versions
EP3470932A1 (de
Inventor
Jérémy BRECHBÜHL
Vasco BELO
Bruno Herrera
Matthijs VAN STRAATEN
Bernard Chervet
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.)
Richemont International SA
Original Assignee
Richemont International SA
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Filing date
Publication date
Application filed by Richemont International SA filed Critical Richemont International SA
Publication of EP3470932A1 publication Critical patent/EP3470932A1/de
Application granted granted Critical
Publication of EP3470932B1 publication Critical patent/EP3470932B1/de
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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
    • G04B17/32—Component parts or constructional details, e.g. collet, stud, virole or piton
    • G04B17/34—Component parts or constructional details, e.g. collet, stud, virole or piton for fastening the hairspring onto the balance
    • G04B17/345—Details of the spiral roll
    • 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
    • G04B18/00—Mechanisms for setting frequency
    • G04B18/04—Adjusting the beat of the pendulum, balance, or the like, e.g. putting into beat
    • G04B18/06—Adjusting the beat of the pendulum, balance, or the like, e.g. putting into beat by setting the collet or the stud of a hairspring
    • 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
    • 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
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • 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
    • G04B33/00—Calibers
    • G04B33/06—Calibers of extremely flat shape

Definitions

  • the present invention relates to an oscillator for a watch movement comprising a balance shaft mounted to rotate in a balance bridge intended to be assembled to a frame member of the watch movement, a balance and a ferrule integral with the balance shaft.
  • the invention also relates to a watch movement comprising such an oscillator as well as a timepiece comprising such a watch movement.
  • the patent application CH 707 226 A2 describes and illustrates a recent example of compact construction of an oscillator of this type.
  • This oscillator comprises a balance shaft carrying a balance and a ferrule, securing the internal end of a hairspring, as well as a double plate made in one piece and frictionally engaged on the balance shaft.
  • the balance axis comprises directly on its surface a raceway to define the internal ring of a ball or roller bearing.
  • This bearing comprises an outer ring having two lugs making it possible to ensure its assembly on a bridge intended to be assembled to a frame element of a watch movement.
  • This bridge fulfills at the same time the role of anchor bridge since it carries a stone in which the anchor rod is pivoted.
  • This construction therefore has a relatively small footprint, in particular in the direction of its thickness, and no bridge covers the sprung balance, which gives it an aerial appearance. Only a piton holder extends partially above the sprung balance to secure the outer end of the hairspring, the piton holder being assembled to the plate of the watch movement.
  • the construction illustrated in this patent application has a size in the axial direction such that it seems difficult to reduce it further. Indeed, the balance and the hairspring are adjacent to each other and it is preferable to maintain a minimum distance between them to limit the risk of collision, in particular in the event of an impact applied to the corresponding timepiece.
  • a main aim of the present invention is to provide an oscillator construction for a watch movement of the type mentioned above, having a reduced size with reference to known constructions, without the saving in size being made to the detriment of simplicity. assembly, good reliability of operation or possibilities of adjustment of the parameters of the oscillator.
  • the present invention relates more particularly to an oscillator for a watch movement meeting the aforementioned characteristics, characterized in that the ferrule is interposed between the balance and the balance shaft to ensure the mounting of the balance on the balance shaft. .
  • the gap between the balance and the hairspring is perfectly controlled, by manufacturing the ferrule, and these two components can be arranged with a minimum distance between them, thus reducing the thickness of the oscillator.
  • these characteristics possibly make it possible to slightly simplify the production of the balance pin which must typically include a shoulder defining a stop when the balance is put in place. Such a shoulder can however be maintained to ensure the installation of the ferrule on the axis of pendulum.
  • the risk of breakage of the balance axis during assembly of the oscillator, in particular when it is made of a brittle material such as ceramic, is reduced since there is only one a component to be driven on it, the ferrule, instead of two in a conventional construction, namely the ferrule and the balance.
  • the shell has a substantially cylindrical barrel arranged to define a bearing surface for the balance and delimited in its axial direction by at least one shoulder defining an axial stop for the balance.
  • the ferrule can advantageously be made for the ferrule to include at least three, preferably four, shoulders defining axial stops for the balance, at least part of the shoulders also being intended to ensure guidance of a first internal turn of a spiral.
  • the ferrule is arranged on the balance axis such that the shoulder or shoulders are located between the balance bridge and the barrel.
  • the hairspring can optionally be partially housed in the thickness of the balance to further reduce the thickness of the oscillator according to the invention.
  • this makes it possible to accommodate a peg to lock the outer turn of the balance spring on the bridge side and not over the oscillator as is the case with the prior construction mentioned above.
  • the balance bridge can have a bore defining an outer ring of a ball or roller bearing, cooperating with an internal ring of the bearing secured to the balance shaft.
  • a raceway to be provided directly on the surface of the balance shaft to define at least a portion of the internal ring.
  • the balance axis can also be made for the balance axis to carry a double plate made in one piece with it.
  • the oscillator comprises a stud intended to cooperate with an external turn of a hairspring, the balance bridge carrying a bearing housing the balance axis, that the oscillator further comprises a support having a curved slot, of substantially constant radius of curvature and arranged concentrically to the bearing, the pin being housed in the curved slot being able to occupy different positions along the length of the latter to adjust the landmark.
  • the support can then advantageously be an anchor bridge having an indexed position with reference to the balance bridge.
  • the present invention also relates to a horological movement comprising an oscillator meeting the characteristics which have just been described as well as a timepiece comprising such a horological movement.
  • the figure 1 represents a simplified and exploded perspective view of part of an oscillator 1 for a watch movement according to a preferred embodiment of the invention.
  • the figures 2a and 2b show perspective views of Oscillator 1 when assembled, the assembly being shown complete in Figure figure 2a and in section on the figure 2b to make certain construction details visible.
  • Oscillator 1 is of the sprung balance type. It comprises a balance 2, with an adjustment screw, and a hairspring 4, interacting with each other in a conventional manner.
  • the balance 2 and the hairspring 4 are intended to be assembled to a balance shaft 6 by means of a ferrule 8, frictionally engaged on the balance shaft 6 in a known manner.
  • the ferrule acts as a first locking member for a first, internal end of the balance spring 4, in a conventional manner.
  • the ferrule 8 here plays a particular role compared to known constructions: it is engaged on the balance axis 6 in a conventional manner, but the balance 2 is engaged on it rather than being positioned resting against a shoulder of the balance axis 6 as is generally the case.
  • This construction makes it possible to limit the stresses applied to the balance axis 6 which could otherwise break, depending on the material in which it is made, for example ceramic.
  • this construction also makes it possible to reduce the size of the oscillator in the direction of its thickness, the balance 2 and the hairspring 4 being located very close to one another.
  • the shell 8 comprises a substantially cylindrical barrel 7, arranged to define a bearing surface for the balance 2 and delimited, along its axial direction. , by four shoulders 9 defining axial stops for the balance 2 when it is adjusted, centered and then riveted to the shell 8. It is also noted that the shell 8 is arranged such that the balance 2 is located substantially at the free end of the balance shaft 6, the hairspring 4 thus being located on the side of the watch movement, as emerges more particularly from the figures 2a and 2b .
  • the balance axis 6 here fulfills several additional functions, advantageously and preferably but not absolutely necessary for the implementation of the present invention. More precisely, a conventional double plate 10, 12 is made in one piece with the balance axis 6. The large plate 10 is pierced with a hole 14, axial, intended to receive a plate pin 16 (on the figure 2b ) intended to cooperate with an anchor of an escapement.
  • a raceway 18 is provided directly on the surface of the balance shaft 6 so that the latter can play the role of at least part of the inner ring of a ball or roller bearing.
  • the balance shaft 6 is then intended to be engaged in the central bore 20 of a balance bridge 22 defining an outer ring of the bearing, the central bore 20 playing the role of a bearing for the balance shaft. 6.
  • a ring 24 defining an additional annular bearing bearing surface is made integral with the balance shaft 6 after insertion of the balls 26, to keep the latter captive in the bearing thus closed.
  • balance bridge 22 is here directly associated with an anchor bridge 28 also having a central bore 30 defining a housing for the double plate 10, 12 of the balance shaft 6 and to allow it subsequently to cooperate with the anchor, as will more particularly emerge from figures 3a to 3c .
  • the balance bridge 22 has two holes 32 intended to be aligned with two holes 34 of the anchor bridge 28, for the purpose of indexing these two bridges, as will also emerge from the figures 3a to 3c .
  • the balance bridge 22 has three additional holes 36 intended to be aligned with three corresponding recesses 38 of the anchor bridge 28, to allow the assembly of the oscillator on the plate of a watch movement, like this will also emerge from figures 3a to 3c .
  • anchor bridge 28 has two additional functional zones which are substantially diametrically opposed, by way of non-limiting illustration.
  • the anchor bridge 28 comprises a raised portion 40 housing a stone 42 intended to receive the anchor rod.
  • the anchor bridge 28 comprises a portion 44 having an extra thickness with reference to the average thickness of the bridge.
  • a slot 46 passing through the portion 44 along its thickness is provided in the anchor bridge 28 to define a housing for a second locking member of the second, external end of the hairspring 4, or here a eyelet 48.
  • the slot 46 is curved, with a substantially constant radius of curvature, and is arranged concentrically with the central bore 30 of the anchor bridge 28, such that it is concentric with the central bore 20 of the anchor bridge. balance 22 and that its center of curvature is, therefore, located on the pivot axis of the balance axis 6.
  • the peg 48 has a bearing surface 50 whose transverse dimensions are greater than the width of the slot 46 in order to define a stop in the axial direction.
  • the bearing surface 50 is surmounted by a barrel 52 advantageously having two opposite flats 53 intended to cooperate with the walls of the slot 46 to ensure guidance of the pin 48 along the length of the slot 46, when adjusting the mark.
  • the barrel 52 is itself surmounted by a clamp 54 for locking the conventional balance spring, intended to cooperate with the end turn of the balance spring 4, typically by gluing.
  • any movement of the pin 48 along the length of the slot 46 has the effect of moving the outer end of the hairspring 4 with reference to its inner end, which makes it possible to adjust the reference of the oscillator, that is to say say to ensure that the oscillations of the balance 2 on either side of its rest position are symmetrical.
  • a locking device is provided for locking the stud 48 in the position corresponding to the setting of the mark for fixing the latter.
  • This locking device comprises a plate 56 intended to be positioned substantially opposite the slot 46 and resting against the bearing surface 50 of the pin 48 to press it against the anchor bridge 28 and immobilize the pin 48.
  • the assembly of the plate 56 to the anchor bridge 28 is here produced by means of two screws 58.
  • the watchmaker wishing to adjust the mark must loosen the two screws 58 to move the plate 56 away from the anchor bridge 28 and release the pin. 48 which can then be moved to a new position.
  • the two screws 58 can then be tightened to bring the plate 56 closer to the anchor bridge 28 and ensure the plating of the bearing 50 of the pin 48 against the anchor bridge 28, thereby ensuring the locking of the pin 48.
  • the bearing of the eyebolt may be located between the barrel and the clamp, so as to rest on the upper plane of the anchor bridge in the orientation of the figure 1 .
  • the barrel could then be provided with a central tapped hole with which a screw within scope could cooperate in such a way that, when this screw was tightened, in a movement from bottom to top on the sight of the figure 1 , the anchor bridge would be clamped between it and the span of the piton, thus ensuring that the latter is locked.
  • the figures 3a, 3b and 3c show, in the same simplified perspective view, the successive stages of assembling the oscillator 1 which has just been described on a watch movement.
  • the plate 60 of the horological movement is shown but will not be described in detail, given that it comprises various particular recesses having no relation to the implementation of the present invention.
  • the plate 60 comprises a double recess 62, the left part of which on the figure 3a is intended to receive oscillator 1 and the right part is intended in particular to receive the escape wheel (not shown).
  • the plate comprises a stone 64 located substantially at the limit between the two parts of the recess 62 and in which the rod 66 of the anchor 68 is housed.
  • the recess 62 has a complex shape that is substantially complementary to that of oscillator 1, in particular with different regions of different depths.
  • a first small recess 70 is made in the region around the fork and the stinger of the anchor 68, this recess 70 being intended to house the small plate 12 of the balance shaft 6, which is intended to cooperate with the stinger of the anchor 68.
  • the pin 16 driven into the large plate 10 is for its part intended to cooperate with the fork of the anchor 68, in a conventional manner.
  • a second small recess 72 has a shape similar to that of the portion 44 of the anchor bridge 28 having an extra thickness, that is to say the portion in which the slot 46 is made to accommodate the eyebolt 48.
  • two feet 74 extend from the bottom of the recess 62, as well as three threaded pillars 76 intended to receive screws.
  • the raised portion 40 of the anchor bridge 28 defines a passage for the anchor 68.
  • the central bore 30 of the anchor bridge 28 has two protruding portions 78 defining stars for the anchor 68.
  • the bearing is formed by assembling the balance shaft 6 to the balance bridge 22, with insertion of the balls 26 then closing of the bearing with the ring 24.
  • the hairspring 4 and the balance 2 are assembled to the ferrule 8, before the latter is forcibly engaged on the 'balance pin 6.
  • Three screws 80 are then screwed into the pillars 76 to ensure the attachment of the oscillator 1 to the plate 60.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)

Claims (12)

  1. Oszillator (1) für ein Uhrwerk, der Folgendes umfasst:
    eine Unruhwelle (6), die in einer Unruhbrücke (22) drehbar gelagert ist, welche dazu bestimmt ist, an einem Rahmenelement (60) des Uhrwerks befestigt zu sein,
    eine Unruh (2) und eine Spiralrolle (8), die mit der Unruhwelle (6) fest verbunden sind,
    dadurch gekennzeichnet, dass die Spiralrolle (8) zwischen der Unruh (2) und der Unruhwelle (6) eingefügt ist, um die Montage der Unruh (2) an der Unruhwelle (6) sicherzustellen.
  2. Oszillator (1) nach Anspruch 1, dadurch gekennzeichnet, dass die Spiralrolle (8) eine im Wesentlichen zylindrische Hülse (7) aufweist, die angeordnet ist, um eine Auflagefläche für die Unruh (2) zu definieren, und in ihrer axialen Richtung durch mindestens einen Absatz (9), der einen axialen Anschlag für die Unruh (2) definiert, abgegrenzt wird.
  3. Oszillator (1) nach Anspruch 2, dadurch gekennzeichnet, dass die Spiralrolle (8) mindestens drei, vorzugsweise vier Absätze (9) umfasst, die axiale Anschläge für die Unruh (2) definieren, wobei mindestens ein Teil der Absätze (9) auch dazu bestimmt ist, ein Führen einer ersten inneren Windung einer Spirale (4) sicherzustellen.
  4. Oszillator (1) nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Spiralrolle (8) so auf der Unruhwelle (6) angeordnet ist, dass sich der eine oder die mehreren Absätze (9) zwischen der Unruhbrücke (22) und der Hülse (7) befinden.
  5. Oszillator (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Unruhbrücke (22) eine Bohrung (20) aufweist, die einen Außenring eines Wälzlagers mit Kugeln oder Kegelrollen definiert, der mit einem Innenring des Wälzlagers, der fest mit der Unruhwelle (6) verbunden ist, zusammenwirkt.
  6. Oszillator (1) nach Anspruch 5, dadurch gekennzeichnet, dass eine Wälzfläche (18) direkt an der Oberfläche der Unruhwelle (6) eingerichtet ist, um mindestens einen Abschnitt des Innenrings zu definieren.
  7. Oszillator (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Unruhwelle (6) eine Doppelplatte (10, 12) trägt, die einstückig mit ihr ausgebildet ist.
  8. Oszillator (1) nach einem der vorhergehenden Ansprüche, der ein Spiralklötzchen (48) umfasst, das dazu bestimmt ist, mit einer äußeren Windung einer Spirale (4) zusammenzuwirken, wobei die Unruhbrücke (22) ein Lager (20) trägt, das die Unruhwelle (6) aufnimmt,
    dadurch gekennzeichnet, dass er eine Halterung umfasst, die einen gebogenen Schlitz (46) mit einem im Wesentlichen konstanten Biegeradius aufweist, der konzentrisch zu dem Lager (20) angeordnet ist, wobei das Spiralklötzchen (48) in dem gebogenen Schlitz (46) aufgenommen ist und entlang der Länge desselben unterschiedliche Positionen einnehmen kann, um den Abfall einzustellen.
  9. Oszillator (1) nach Anspruch 8, dadurch gekennzeichnet, dass er eine Verriegelungsvorrichtung (56, 58) umfasst, die auf Verlangen und in der einen oder anderen Richtung zwischen Folgendem umschalten kann:
    einem ersten aktiven Zustand, in dem sie auf das Spiralklötzchen (48) einwirkt, um es in einer vorgegebenen Position zu verriegeln, und
    einem zweiten inaktiven Zustand, in dem sie das Spiralklötzchen (48) freigibt, damit es sich entlang der Länge des gebogenen Schlitzes (46) bewegen kann.
  10. Oszillator (1) nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass die Halterung eine Ankerbrücke (28) ist, die eine in Bezug auf die Unruhbrücke (22) indexierte Position aufweist.
  11. Uhrwerk, das einen Oszillator (1) nach einem der vorhergehenden Ansprüche umfasst.
  12. Uhr, die ein Uhrwerk nach Anspruch 11 umfasst.
EP18198921.1A 2017-10-16 2018-10-05 Oszillator für uhrwerk Active EP3470932B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH01263/17A CH714250A1 (fr) 2017-10-16 2017-10-16 Oscillateur pour mouvement horloger.

Publications (2)

Publication Number Publication Date
EP3470932A1 EP3470932A1 (de) 2019-04-17
EP3470932B1 true EP3470932B1 (de) 2020-08-26

Family

ID=60301733

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18198921.1A Active EP3470932B1 (de) 2017-10-16 2018-10-05 Oszillator für uhrwerk

Country Status (2)

Country Link
EP (1) EP3470932B1 (de)
CH (1) CH714250A1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2391816A (en) * 1944-07-29 1945-12-25 Hamilton Watch Co Hairspring collet
GB1138677A (en) * 1966-11-29 1969-01-01 Seiko Instr & Electronics Hairspring collet for a timepiece
CH706798B1 (fr) * 2012-08-07 2022-03-31 Eta Sa Mft Horlogere Suisse Mouvement horloger comprenant un système oscillant.
CH707226B1 (fr) * 2012-11-16 2017-01-13 Richemont Int Sa Mouvement horloger pourvu d'un balancier monté pivotant à l'aide d'un roulement à billes ou à galets.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CH714250A1 (fr) 2019-04-30
EP3470932A1 (de) 2019-04-17

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