EP3839656A1 - Unruh für uhrwerk - Google Patents

Unruh für uhrwerk Download PDF

Info

Publication number: EP3839656A1
Authority: EP; European Patent Office
Prior art keywords: balance; elastic arm; weight; center; arm
Prior art date: 2019-12-18
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.): Granted

Application number

EP19217681.6A

Other languages

English (en)

French (fr)

Other versions

EP3839656B1 (de

Inventor

M. Ivan HERNANDEZ

M. Pierre CUSIN

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.)

Nivarox Far SA

Nivarox SA

Original Assignee

Nivarox Far SA

Nivarox 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.)

2019-12-18

Filing date

2019-12-18

Publication date

2021-06-23

2019-12-18 Application filed by Nivarox Far SA, Nivarox SA filed Critical Nivarox Far SA

2019-12-18 Priority to EP19217681.6A priority Critical patent/EP3839656B1/de

2020-12-07 Priority to JP2020202441A priority patent/JP7051992B2/ja

2020-12-09 Priority to US17/116,367 priority patent/US11599062B2/en

2020-12-10 Priority to KR1020200172674A priority patent/KR102517495B1/ko

2020-12-17 Priority to RU2020141726A priority patent/RU2754891C1/ru

2020-12-18 Priority to CN202011502827.4A priority patent/CN113009806B/zh

2021-06-23 Publication of EP3839656A1 publication Critical patent/EP3839656A1/de

2023-12-13 Application granted granted Critical

2023-12-13 Publication of EP3839656B1 publication Critical patent/EP3839656B1/de

Status Active legal-status Critical Current

2039-12-18 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
- 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
- G04B18/006—Mechanisms for setting frequency by adjusting the devices fixed on the 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
- G04B18/00—Mechanisms for setting frequency
- G04B18/08—Component parts or constructional details

Definitions

the invention relates to a balance for a clockwork movement, comprising rigid parts constituted by a hub defining the pivot axis of the balance, a rim, and at least one arm connecting the rim to the hub, and comprising at least one locking member. holding for reception and pinching in position of a rod of a weight.
the invention relates to the field of clockwork oscillators, and more particularly to the field of balances comprising means for adjusting inertia and / or balancing.
balances are known with means for adjusting inertia and / or balancing.
balances with screw weights or driven out in implantations of the rim of a balance are known.
Some embodiments have attempted to ensure the retention of weights by pinching.
CH 705 238 which discloses a balance comprising at least one slot for receiving and pinching in position a rod of a weight, the slot being delimited by, on the one hand a said rigid part of the balance, and on the other hand an arm elastic permanently biased towards said rigid part of said balance defining said slot to hold the weight.
the elastic arm undergoes significant plastic deformations due to its separation. These plastic deformations can then cause defects in the material, such as cracks. This can therefore adversely affect the reliability of the balance, or even damage it, since the weight can no longer be held correctly by the elastic arm and can become dislodged.
the object of the invention is in particular to overcome the various drawbacks of these known techniques.
an objective of the invention is to provide a balance making it possible to obtain better maintenance of the weights with an elastic arm capable of remaining within stress levels not exceeding its elastic limit and thus minimizing the risk of defects.
Another objective of the invention is to provide a balance with an elastic arm having a sufficiently rigid geometry and allowing a sufficient support force to allow the weight to be held in place regardless of the type of shock that the watch has. undergoes.
the invention also relates to a timepiece movement comprising a sprung balance oscillator system in accordance with the invention.
the invention also relates to a timepiece comprising a timepiece movement according to the invention.
the invention also relates to a method of mounting a weight on a balance according to the invention.
the object of the present invention by its various functional and structural aspects described above, makes it possible to obtain a more robust balance, in particular thanks to the disappearance of surface tensile stress along the inner surface of the elastic arm. , this making it possible to limit the formation of weakened zones.
the invention relates to a balance 1 for a timepiece movement.
the balance comprising rigid parts constituted by a hub 2, the center of which defines the pivot axis A of the balance 1, a rim 3, and at least one arm 4 connecting the rim 3 to the hub 2.
the balance is made of copper, or of a copper alloy such as nickel silver.
the balance wheel can also be made of aluminum, an aluminum alloy, titanium or titanium alloy, gold or gold alloy, platinum or platinum alloy.
the balance 1 also comprises at least one resilient arm 5 comprising a first end 5B integral with the rim of the balance 1, and a second distal end 5A free relative to the hub 2, to the arm 4, and the rim sector 3, the free end 5A being able to deform in the plane of the rim and tighten a weight 6 on the balance.
the balance also has a slot 7 capable of receiving the weight 6, the slot 7 being delimited on the one hand by the free end 5A of the elastic arm, and on the other hand by a rigid part 8 integral with the rim and the hub.
the slot 7 has an opening 9 allowing the end 5A of the elastic arm to move perpendicularly with respect to the arm 4 and to be in contact with the weight 6 to clamp it against the arm 4 when the latter is placed in the slot .
the elastic arm 5 comprises a hook-shaped body 5C, the free distal end 5A of the hook being parallel to a part of the balance which has a rigidity greater than or equal to that of the elastic arm 5, such a shape hook allows a good distribution of stresses while limiting the size in the free space between the rim and the hub.
the free distal end 5A of the elastic arm 5 has a flat 50 arranged opposite the part of the balance having a rigidity greater than or equal to that of the elastic arm 5, the rigid part possibly being an arm 4 of the balance or another elastic arm 5 for example.
the elastic arm 5 comprises an interior surface S1 of constant curvature over an angle ⁇ , in the center of the circle with center C, greater than 240 °, such a configuration making it possible to make the arm work in compression along the interior surface. S1.
the elastic arm 5 also comprises a constant section over an angle ⁇ , at the center of the circle with center C, greater than 150 °, such a configuration making it possible to have more material under stress.
the flat 50 extends over an angle ⁇ , at the center of the circle with center C, between 20 ° and 50 °.
the slot 7 extends parallel to a radial R issuing from said pivot axis D, and opens into a housing 10 and comprises a notch 11 to precisely position the weight 6 and hold it in place.
the width of the opening 9 is provided less than the diameter of the weight or of the shank of the weight to hold the weight in place.
the weight 6 comprises a head 61 comprising an adjustment profile 63 arranged to cooperate with a tool.
the weight 6 may include a rod 62 which extends this head 61, which has a diameter greater than that of the rod 62.
the weight 6 is equipped with a foot 65, which the rod 62 then connects to the head 61, the latter and the foot 65 then both having a diameter greater than that of the rod. 62, so as to limit the travel of the weight 6 at the elastic arm 5, in a direction parallel to the pivot axis D, or even to immobilize it in this direction.
the rod 62 extends along an axis passing through the center of the weight 6, once gripped by the elastic arm 5, the weight is angularly orientable around this axis by means of a tool on the adjustment profile 63.
the weight 6 has an unbalance around this axis, which results for example from a flat 64 made on the head 61, as visible on the figure 2a .
the free end 5A of the elastic arm 5 is moved perpendicular to the general direction of the radius connecting the attachment of the rigid arm to the hub and to the rim relative to to the rigid wall 8.
the free end 5A has a face flat, facing the notch 11, to provide good support for the rod of the weight 6.
the weight 6 comprises a rod 62 whose minimum diameter is greater than the width of the slot 7 in the free state, and whose maximum diameter is less than the width of the slot 7 when the elastic arm 5 is separated from the rigid part 8 of the balance 1 delimiting the slot 7 under the effect of a separation force applied to the slot 7 or to the elastic arm 5.
the elastic arm 5 forms a housing 10 delimited by a wall 50, the body 5C of the elastic arm being arranged to deform elastically during the assembly of the weight 6 to the balance, the free end 5A of the arm. elastic 5 being able to move substantially perpendicularly, in the plane of the rim, relative to the arm 4.
the housing 10 has a circular shape with center C, internal radius R1 and external radius R2, the distance between the two radii R1 and R2 representing the thickness of the circular arc portion.
the body 5C of the elastic arm 5 has a first portion in the form of a circular arc of constant section.
the circular arc shape makes it possible, on the one hand to increase the surface over which the stresses are distributed, and on the other hand to store as much elastic energy as possible thanks to a volume of material under stress that is greater than to the prior art.
the body 5C also comprises a second portion in the extension of the first portion, the second portion being parallel to said arm.
the first portion of the arm has a greater thickness compared to the second portion.
Such a configuration makes it possible to have more material under stress and therefore to store more energy and thus restore a good holding force on the weight 6.
the first arc-shaped portion of circle undergoes very little plastic deformation while providing very good support for the weight.
the second portion of the arm arranged parallel to the rigid part 8, has a smaller thickness compared to the first portion.
the second portion of the elastic arm can be considered as an embedded beam of non-constant section stressed in bending, the body 5C therefore only undergoes very little plastic deformation.
the elastic arm 5 undergoes only 0.3% of plastic deformations along the wall of the portion in the arc of a circle while the solution used in the prior art undergoes 2% of plastic deformations. .
the solution used therefore makes it possible to reduce the stresses undergone by the elastic arm 5 during the installation of the weight 6.
Such a geometry makes it possible to stress the inner wall of the arcuate portion of the elastic arm 5 in compression and the outer wall in tension.
Such a configuration also makes it possible to limit, or even eliminate, the formation of weakened zones such as microcracks that are harmful to the good maintenance of the weight over time.
the dimensions and the geometry of the elastic arm 5 are determined to obtain a minimum desired holding force of the weight, the holding force obtained by the elastic arm being at least 0.7N.
the length and width of the circular arc portion of the elastic arm 5 are determined to remain below a stress level in order to avoid plastic deformation.
the dimensions of the elastic arm 5 make it possible to store a significant elastic energy resulting from the deformation of the arm, the deformation energy being restored in the form of a holding force on the rod of the weight clamped by the elastic arm 5, which ensures its strength and torque resistance in the notch 11.
the housing 10 formed by the elastic arm 5 has a relatively large radius at the bottom of curvature, this particular shape is determined to obtain a better distribution of the stresses during the assembly of the flyweight 6, the stresses being distributed over a much larger area compared to the prior art this makes it possible to avoid weakening of the structure along of the curvature formed by the arc of a circle.
the radius at the bottom of the curvature of the holding member is much smaller, which implies a very localized distribution of stresses, the formation of microcracks at this location, and therefore a gradual reduction in the stress. holding force over time.
the balance can include two or four elastic arms 5.
the method may comprise an optional step following step c) during which the weight 6 is finely positioned so that the head of the weight is in contact with the upper face of the arm 5 and the upper face of the rigid wall 8.
the invention also relates to a balance 1 which comprises a plurality of retaining members 5, each being arranged to receive at least one weight 6.
the invention also relates to a timepiece movement comprising at least one such balance 1 as described above.
the invention also relates to a timepiece comprising at least one such movement, and which is preferably a watch.

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Physics & Mathematics (AREA)
General Physics & Mathematics (AREA)
Micromachines (AREA)
Electromechanical Clocks (AREA)
Springs (AREA)
Golf Clubs (AREA)
Electric Clocks (AREA)
Gyroscopes (AREA)

EP19217681.6A 2019-12-18 2019-12-18 Unruh für uhrwerk Active EP3839656B1 (de)

Priority Applications (6)

Application Number	Priority Date	Filing Date	Title
EP19217681.6A EP3839656B1 (de)	2019-12-18	2019-12-18	Unruh für uhrwerk
JP2020202441A JP7051992B2 (ja)	2019-12-18	2020-12-07	計時器テンプ
US17/116,367 US11599062B2 (en)	2019-12-18	2020-12-09	Timepiece balance
KR1020200172674A KR102517495B1 (ko)	2019-12-18	2020-12-10	타임피스 밸런스
RU2020141726A RU2754891C1 (ru)	2019-12-18	2020-12-17	Часовой баланс
CN202011502827.4A CN113009806B (zh)	2019-12-18	2020-12-18	时计摆轮

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
EP19217681.6A EP3839656B1 (de)	2019-12-18	2019-12-18	Unruh für uhrwerk

Publications (2)

Publication Number	Publication Date
EP3839656A1 true EP3839656A1 (de)	2021-06-23
EP3839656B1 EP3839656B1 (de)	2023-12-13

Family

ID=68965699

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP19217681.6A Active EP3839656B1 (de)	2019-12-18	2019-12-18	Unruh für uhrwerk

Country Status (6)

Country	Link
US (1)	US11599062B2 (de)
EP (1)	EP3839656B1 (de)
JP (1)	JP7051992B2 (de)
KR (1)	KR102517495B1 (de)
CN (1)	CN113009806B (de)
RU (1)	RU2754891C1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP4194964B1 (de) *	2021-12-10	2024-07-24	Nivarox-FAR S.A.	Unruh mit trägheitsregulierung

Citations (4)

* Cited by examiner, † Cited by third party
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CH227189A (fr) *	1942-07-13	1943-05-31	Ebauches Sa	Procédé de fabrication d'un balancier, et balancier fabriqué selon ce procédé.
CH343904A (fr) *	1959-06-03	1959-12-31	Rolex Montres	Balancier pour pièce d'horlogerie
CH705238A2 (fr)	2011-07-15	2013-01-15	Nivarox Sa	Balancier à réglage d'inertie pour mouvement d'horlogerie.
FR3043801A3 (fr) *	2015-11-13	2017-05-19	Nivarox-Far Sa	Balancier a reglage d'inertie

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HK1186057A2 (en) *	2013-01-14	2014-03-07	Master Dynamic Limited	Stress-relief elastic structure of hairspring collet
JP6070937B2 (ja) *	2013-02-20	2017-02-01	セイコーインスツル株式会社	てんぷ、時計用ムーブメント及び機械式時計
EP2887154B1 (de) *	2013-12-20	2016-07-20	Blancpain SA.	Befestigungsmechanismus eines Spiralklötzchen an eine Unruhbrücke, und Reguliervorrichtung mit Unruh-Spiralfeder, die einen solchen Mechanismus umfasst
JP2015143673A (ja) *	2013-12-27	2015-08-06	セイコーインスツル株式会社	てんぷ、ムーブメント、および時計
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EP3252545B1 (de) *	2016-06-03	2019-10-16	The Swatch Group Research and Development Ltd.	Uhrenmechanismus zum einstellen der unruhträgheit
CH712711B1 (fr) *	2016-07-18	2023-07-31	Eta Sa Mft Horlogeres Suisse	Procédé de réglage de la marche d'une pièce d'horlogerie.
EP3276431B1 (de) *	2016-07-27	2020-01-01	Cartier International AG	Mechanischer oszillator für uhrwerk
CH714480A2 (fr) *	2017-12-20	2019-06-28	Swatch Group Res & Dev Ltd	Dispositif de réglage autonome de la longueur active d'un spiral.
EP3736640B1 (de) *	2019-05-07	2022-12-21	Nivarox-FAR S.A.	Unruh für uhrwerk

2019
- 2019-12-18 EP EP19217681.6A patent/EP3839656B1/de active Active
2020
- 2020-12-07 JP JP2020202441A patent/JP7051992B2/ja active Active
- 2020-12-09 US US17/116,367 patent/US11599062B2/en active Active
- 2020-12-10 KR KR1020200172674A patent/KR102517495B1/ko active Active
- 2020-12-17 RU RU2020141726A patent/RU2754891C1/ru active
- 2020-12-18 CN CN202011502827.4A patent/CN113009806B/zh active Active

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
CH227189A (fr) *	1942-07-13	1943-05-31	Ebauches Sa	Procédé de fabrication d'un balancier, et balancier fabriqué selon ce procédé.
CH343904A (fr) *	1959-06-03	1959-12-31	Rolex Montres	Balancier pour pièce d'horlogerie
CH705238A2 (fr)	2011-07-15	2013-01-15	Nivarox Sa	Balancier à réglage d'inertie pour mouvement d'horlogerie.
FR3043801A3 (fr) *	2015-11-13	2017-05-19	Nivarox-Far Sa	Balancier a reglage d'inertie

Also Published As

Publication number	Publication date
US11599062B2 (en)	2023-03-07
CN113009806B (zh)	2022-06-14
RU2754891C1 (ru)	2021-09-08
CN113009806A (zh)	2021-06-22
KR102517495B1 (ko)	2023-04-03
KR20210079199A (ko)	2021-06-29
JP7051992B2 (ja)	2022-04-11
JP2021096243A (ja)	2021-06-24
US20210191328A1 (en)	2021-06-24
EP3839656B1 (de)	2023-12-13

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