EP4428623A1 - Vorrichtung zur autonomen einstellung der aktiven länge einer spiralfeder - Google Patents

Vorrichtung zur autonomen einstellung der aktiven länge einer spiralfeder Download PDF

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Publication number
EP4428623A1
EP4428623A1 EP23160130.3A EP23160130A EP4428623A1 EP 4428623 A1 EP4428623 A1 EP 4428623A1 EP 23160130 A EP23160130 A EP 23160130A EP 4428623 A1 EP4428623 A1 EP 4428623A1
Authority
EP
European Patent Office
Prior art keywords
hairspring
arm
active length
stud
weight
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.)
Withdrawn
Application number
EP23160130.3A
Other languages
English (en)
French (fr)
Inventor
Paulo Bravo
Andrés Cabezas Jurin
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.)
Swatch Group Research and Development SA
Original Assignee
Swatch Group Research and Development SA
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
Application filed by Swatch Group Research and Development SA filed Critical Swatch Group Research and Development SA
Priority to EP23160130.3A priority Critical patent/EP4428623A1/de
Priority to EP24153712.5A priority patent/EP4428626B1/de
Priority to US18/426,573 priority patent/US20240302794A1/en
Priority to JP2024017667A priority patent/JP7642884B2/ja
Priority to CN202410254826.4A priority patent/CN118605102A/zh
Publication of EP4428623A1 publication Critical patent/EP4428623A1/de
Withdrawn legal-status Critical Current

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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
    • G04B17/063—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
    • 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
    • G04B17/20—Compensation of mechanisms for stabilising frequency
    • G04B17/24—Compensation of mechanisms for stabilising frequency for the effect of variations of atmospheric pressure
    • 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
    • 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
    • G04B18/02—Regulator or adjustment devices; Indexing devices, e.g. raquettes
    • 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
    • G04B18/02—Regulator or adjustment devices; Indexing devices, e.g. raquettes
    • G04B18/023—Regulator or adjustment devices; Indexing devices, e.g. raquettes with means for fine adjustment of the indexing device
    • 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
    • G04B18/02—Regulator or adjustment devices; Indexing devices, e.g. raquettes
    • G04B18/028—Setting the regulator by means coupled to or depending on another device, e.g. by the time indication setting mechanism

Definitions

  • the invention relates to an autonomous device for adjusting the active length of a hairspring, for a hairspring-balance type oscillator.
  • the invention also relates to a watch movement comprising the autonomous device for adjusting the active length of a hairspring and a balance-spring type oscillator.
  • the invention further relates to a timepiece, in particular a watch, comprising the watch movement.
  • the outer end of the hairspring is immobilized by a stud fixed to a stud holder secured to a balance cock.
  • a rotating indexing device relative to the stud holder is provided to adjust the active length of the hairspring, thus making it possible to adjust the frequency of the sprung balance.
  • the indexing device is a lever, generally equipped with two arms, which pivots centered on the coordinate of the balance shaft.
  • a first arm of the indexing device carries, for example, two pins between which the hairspring is free.
  • a second arm of the indexing device can be manually actuated to pivot the indexing device by a certain angle around the balance shaft. This makes it possible to modify the actual position of the counting point.
  • the active length of the hairspring is reduced or increased.
  • a disadvantage of such a manual adjustment device is that the Earth's gravity influences the frequency of the oscillations of the sprung balance depending on the orientation of the watch movement. corresponding.
  • the rate of a watch may have a significant rate deviation between its horizontal and vertical positions, in particular.
  • the oscillations of the balance-spring cause a disturbance of its active length and therefore a slight variation in the frequency of the oscillations of the balance-spring assembly.
  • a solution implementing a device for adjusting the active length of the hairspring in which the index carries clamping means intended to clamp a terminal portion of the hairspring to define the active length of the latter.
  • the external end of the hairspring is furthermore integral with a fixing system mounted movably relative to the index and arranged to cooperate with the latter.
  • the clamping means consisting for example of a pin-eccentric clamping system in which the terminal portion of the hairspring is clamped, can be loosened or tightened at will by a watchmaker.
  • the invention therefore aims to provide a device for adjusting the active length of a hairspring, for a hairspring-balance type oscillator, making it possible to counterbalance in a simple, precise and autonomous manner the effects of gravity, in particular the disturbances of the isochronism of the balance of the oscillator, and overcoming the aforementioned drawbacks of the state of the art.
  • the invention relates to a device for autonomously adjusting the active length of a hairspring, for a balance-spring type oscillator, comprising a cock mounted on a plate of a watch movement and in which a balance shaft pivots, the hairspring comprising an internal end secured to the balance shaft and an external end secured to a first stud fixed to a stud holder, the stud holder being pivotally mounted on the cock concentrically to the balance shaft, and means for modifying the active length of the hairspring.
  • An advantage of the adjustment device according to the invention lies in the fact that it comprises a weight mounted to rotate freely and cooperating indirectly with a movable arm arranged to act on the external coil of the balance spring.
  • a rotation of the weight, freely subjected to gravity thus causes a movement of the arm, between a rest position and a correction position of the device, and simultaneously acts on the balance spring to modify the active length of the balance spring, making it possible to adjust the latter in order to compensate for the disturbances of the isochronism of the balance due to gravity.
  • the adjustment device according to the invention makes it possible to precisely compensate for the rate of the oscillator according to its position in space, by counterbalancing the disturbances of the isochronism of the balance due to gravity, and this autonomously.
  • the invention also relates to a watch movement comprising the adjustment device described above, and which comprises the characteristics mentioned in dependent claim 17.
  • the invention also relates to a timepiece comprising the watch movement described above, and which comprises the characteristics mentioned in dependent claim 18.
  • FIG. 1 represents a part of a timepiece 1, which comprises a watch movement 2.
  • the timepiece 1 is a watch.
  • the watch movement 2 comprises an oscillator provided with a balance wheel 4 and a hairspring 5, and a device 6 for autonomously adjusting the active length of the hairspring 5.
  • the hairspring 5 is fixed to a balance shaft 7 4 by its inner end (not visible).
  • the balance shaft 7 4 has one end pivotally mounted in a balance bridge (the latter not being visible in the figures for clarity).
  • the outer end of the hairspring 5 is conventionally fixed to a stud 8 fixed to a stud holder 10, the stud holder 10 being secured to a cock 12 by slight tightening. More precisely, the stud holder 10 is pivotally mounted on the cock 12 concentrically to the balance shaft 7 4, as illustrated in the figure 2 .
  • the shaft 7 of balance wheel 4 is pivotally mounted in the cock 12.
  • the means for modifying the active length of the hairspring 5 are capable of modifying the active length of the hairspring 5 by acting on the length of the external coil of the hairspring 5.
  • the means for modifying the active length of the hairspring 5 comprise at least one arm 60 capable of moving between a rest position and a correction position of the device, the at least one arm having a first free end 600 and a second end 601 cooperating with a second stud 8', the second stud 8' being mounted on the stud holder 10 and angularly offset relative to the first stud 8.
  • the adjustment device 6 further comprises damping means comprising a toothed wheel 34 coaxial with the weight 40 and secured to the weight, and a damping device 20 arranged to cooperate with the weight 40 via the toothed wheel 34 and limit the modification of the active length of the balance spring 5 in the event of sudden acceleration or deceleration.
  • the adjustment device comprises elastic constraint means configured to exert an elastic return action in position on the at least one arm 60.
  • the elastic constraint means are in the form of a rod 62 secured to the arm 60 and a spring blade 63 secured to the stud holder 10, the spring blade 61 exerting a return force on the rod 62 to exert an elastic return action in position on the arm 60.
  • the adjustment device comprises a second arm 61 capable of moving between a rest position and a correction position of the device, the second arm 61 having a first free end 610 and a second end cooperating with a third stud 8", the third stud 8" being mounted on the stud holder 10 and angularly offset relative to the first and second studs 8, 8'.
  • the meshing means also comprise a second cam 32 arranged to cooperate with the second arm, the free end 610 of which rests against the second cane 32.
  • Elastic constraint means are also associated with the second arm 61, and comprise a rod 64 secured to the second arm 61 and a spring blade 65 secured to the stud holder 10, the spring blade 65 exerting a return force on the rod 64 and exerting an elastic return action in position on the second arm 61.
  • the adjustment device 6 also comprises means for adjusting the arms 60, 61, the free end 600, 610 of the first and second arms.
  • 60, 61 comprising elastically deformable adjustment means for lengthening or shortening the length of the arms.
  • the adjustment means are in the form of a spring blade, one end of which is secured to the arm and another end is free, the free end being arranged to be placed under stress and adjust the length of the arms 60, 61, the spring blade forming a space between it and the free end of each arm. Such an adjustment is necessary depending on the position of the hairspring and the correction to be made to the latter.
  • the means for modifying the active length of the hairspring 5 comprise two pins 19 fixed to the second stud 8', the second end 601 of the arm 60 being arranged so that it slides between the two pins 19 and comes into contact with the external coil of the hairspring 5 in the correction position and thus modifies the active length of the hairspring.
  • the means for modifying the active length of the hairspring 5 further comprise two other pins 19' fixed to the third stud 8", the second end 611 of the second arm 61 being arranged so that it passes between the two pins 19' and comes into contact with the external coil of the hairspring in the correction position.
  • each arm 60, 61 comprises means for adjusting the elastic stress, the adjustment means being in the form of a screw, the screw passing through the free end of the spring blade and bearing against the arm.
  • the adjustment means being in the form of a screw, the screw passing through the free end of the spring blade and bearing against the arm.
  • the weight 40 is mounted freely in rotation on the axis 41 on which the cams 30, 31 are mounted so that a rotation of the weight 40 causes a movement arms 60, 61 and acts simultaneously on the means for modifying the active length of the balance spring 5.
  • the movement of the arms under the effect of the rotation of the weight 40, itself subject to gravity, is carried out between a rest position of the device, and a correction position of the device, each of the arms allowing a separate correction depending on the position of the watch.
  • the weight 40 is for example made up of a half-solid disk. In an alternative embodiment not shown in the figures, the weight 40 is made up of a solid two-material disk, the two materials of the disk having distinct densities.
  • the weight 40 freely subjected to gravity, can rotate around its axis of rotation and thus cause a movement of the arms 60, 61. In doing so, this rotation of the weight 40 acts simultaneously on the means for modifying the active length of the balance spring 5, making it possible to continuously adjust the active length of the balance spring in order to compensate for disturbances in the isochronism of the balance wheel due to gravity.
  • the adjustment device 6 comprises damping means comprising a toothed wheel 34 coaxial with the flyweight and secured to the latter.
  • the damping means comprise a damping device arranged to cooperate with the flyweight via the toothed wheel to limit, or even prevent, the modification of the active length of the balance spring 5 during a sudden acceleration or deceleration.
  • the damping device 20 is in the form of an air shock absorber, the shock absorber comprising a body 22 with a cavity in which a mass 21 of a shape similar to that of the cavity rotates about an axis 24.
  • the axis 24 also comprises a pinion 23 arranged to cooperate with the teeth of the toothed wheel 34.
  • the weight 40 moves, it drives the toothed wheel 34. which meshes with the pinion 23, and turns the mass 21 of the damping device 20. It is therefore understood that during a sharp movement of the weight 40, the mass 21 will slow the rotation of the weight 40 thanks to the damping device 20.
  • other types of shock absorber can be put in place, such as a mass moving in a cylinder, or even a magnetic shock absorber.
  • the shaft 30 carrying the weights 40, the toothed wheel 34 and the cams 31, 32 also comprises a heart-shaped cam 33 secured to the shaft 30, and superimposed on the cams 31, 32.
  • the heart-shaped cam 33 is arranged to cooperate with a spring 24, 25 whose end 26 cooperates with the profile of the heart-shaped cam 33, the assembly thus forming a device for resetting the position of the first and second arms 60, 61 to return them to their rest position naturally.
  • the device 6 comprises two cams 30, 31 for driving the arms 60, 61.
  • the cams 30, 31 are integral with the shaft 30, angularly offset from each other, and are each respectively in contact with the free end 600, 610 of the arms 60, 61.
  • each cam 30, 31 is a radial cam with an external profile.
  • radial cams with a substantially rectangular external profile are shown in the Figures 1 to 4 , in practice the shape envisaged for the external profile of each cam will depend on the type of spiral 5 used and the correction to be made to it.
  • a radial cam with a triangular, oblong or even ovoid external profile can also be used in the context of the present invention.
  • a flat portion of each cam is in contact with an arm 60, 61, while in the correction position of the device 6, a corner or an angle of the cam 30, 31 is in contact with the arm 60, 61. More preferably, as visible on the figures 1 , 3 and 4 , each cam 30, 31 is in contact with its respective arm whatever the position of the weight 40.
  • the weight 40 freely subjected to gravity, can rotate around its axis of rotation and thus cause a movement of the arms 60, 61. In doing so, this rotation of the weight 40 acts simultaneously on the means for modifying the active length of the balance spring 5, making it possible to continuously adjust the active length of the balance spring in order to compensate for disturbances in the isochronism of the balance wheel due to gravity.
  • the rotation of the weight 40 causes a rotation of the shaft 30 and has the effect of moving the cams 31, 32 which are integral with the shaft, the cams then acting on the free end 600, 610 of the arms 60, 61 and moving at least one of the arms 60, 61 so that the second end of one of the arms comes into contact with the balance spring 5 so as to modify the active length of the balance spring 5.
  • the device will return by itself to the rest position thanks to the action of the spring 24, 25 on the heart-shaped cam 33 which is also integral with the shaft 31.
  • the invention also relates to a watch movement 2 comprising an oscillator 4, 5 of the balance-spring type and a device 6 for autonomous adjustment of the active length of the balance spring 5 as described previously.
  • the invention also relates to a timepiece 1 comprising a watch movement 2 provided with a device 6 for autonomous adjustment of the active length of the hairspring 5 as described previously.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Transmission Devices (AREA)
EP23160130.3A 2023-03-06 2023-03-06 Vorrichtung zur autonomen einstellung der aktiven länge einer spiralfeder Withdrawn EP4428623A1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP23160130.3A EP4428623A1 (de) 2023-03-06 2023-03-06 Vorrichtung zur autonomen einstellung der aktiven länge einer spiralfeder
EP24153712.5A EP4428626B1 (de) 2023-03-06 2024-01-24 Vorrichtung zur autonomen einstellung der aktiven länge einer spiralfeder
US18/426,573 US20240302794A1 (en) 2023-03-06 2024-01-30 Device for autonomous adjustment of the active length of a spiral
JP2024017667A JP7642884B2 (ja) 2023-03-06 2024-02-08 スパイラルの有効長の自律的調整デバイス
CN202410254826.4A CN118605102A (zh) 2023-03-06 2024-03-06 用于自主调节游丝的有效长度的装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23160130.3A EP4428623A1 (de) 2023-03-06 2023-03-06 Vorrichtung zur autonomen einstellung der aktiven länge einer spiralfeder

Publications (1)

Publication Number Publication Date
EP4428623A1 true EP4428623A1 (de) 2024-09-11

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP23160130.3A Withdrawn EP4428623A1 (de) 2023-03-06 2023-03-06 Vorrichtung zur autonomen einstellung der aktiven länge einer spiralfeder
EP24153712.5A Active EP4428626B1 (de) 2023-03-06 2024-01-24 Vorrichtung zur autonomen einstellung der aktiven länge einer spiralfeder

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP24153712.5A Active EP4428626B1 (de) 2023-03-06 2024-01-24 Vorrichtung zur autonomen einstellung der aktiven länge einer spiralfeder

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US (1) US20240302794A1 (de)
EP (2) EP4428623A1 (de)
JP (1) JP7642884B2 (de)
CN (1) CN118605102A (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH705605B1 (fr) 2011-10-14 2016-10-14 Frederique Constant S A Dispositif de réglage de la longueur active d'un spiral.
EP3081996A1 (de) * 2015-04-16 2016-10-19 Montres Breguet S.A. Spirale aus mikrobearbeitbarem material mit isochronismus-korrektur
EP3502788A1 (de) * 2017-12-20 2019-06-26 The Swatch Group Research and Development Ltd Vorrichtung zur selbstregulierung der aktiven länge einer spirale

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH705605B1 (fr) 2011-10-14 2016-10-14 Frederique Constant S A Dispositif de réglage de la longueur active d'un spiral.
EP3081996A1 (de) * 2015-04-16 2016-10-19 Montres Breguet S.A. Spirale aus mikrobearbeitbarem material mit isochronismus-korrektur
EP3502788A1 (de) * 2017-12-20 2019-06-26 The Swatch Group Research and Development Ltd Vorrichtung zur selbstregulierung der aktiven länge einer spirale

Also Published As

Publication number Publication date
JP2024126006A (ja) 2024-09-19
EP4428626B1 (de) 2025-11-19
US20240302794A1 (en) 2024-09-12
JP7642884B2 (ja) 2025-03-10
EP4428626A1 (de) 2024-09-11
CN118605102A (zh) 2024-09-06

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