EP3839655A1 - Unruh für uhrwerk - Google Patents

Unruh für uhrwerk Download PDF

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Publication number
EP3839655A1
EP3839655A1 EP19217646.9A EP19217646A EP3839655A1 EP 3839655 A1 EP3839655 A1 EP 3839655A1 EP 19217646 A EP19217646 A EP 19217646A EP 3839655 A1 EP3839655 A1 EP 3839655A1
Authority
EP
European Patent Office
Prior art keywords
arm
balance
elastic arm
weight
slot
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Withdrawn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
EP19217646.9A
Other languages
English (en)
French (fr)
Inventor
M. Jonas VANNOD
M. Christian CHARBON
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.)
Filing date
Publication date
Application filed by Nivarox Far SA, Nivarox SA filed Critical Nivarox Far SA
Priority to EP19217646.9A priority Critical patent/EP3839655A1/de
Priority to DE212020000784.5U priority patent/DE212020000784U1/de
Priority to CN202090001023.3U priority patent/CN219202142U/zh
Priority to PCT/EP2020/079811 priority patent/WO2021121738A1/fr
Priority to TW109137827A priority patent/TWI767384B/zh
Publication of EP3839655A1 publication Critical patent/EP3839655A1/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Withdrawn legal-status Critical Current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
    • G04B18/00—Mechanisms for setting frequency
    • G04B18/006—Mechanisms for setting frequency by adjusting the devices fixed on the balance

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 generate residual stresses in traction at the surface. Since the majority of balances are made of copper alloy, this implies a risk of stress cracking. 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 guarantee the maintenance of the weights with an elastic arm having a state of compressive stress at the bottom of the slot and thus to minimize 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 that the watch undergoes when it is worn.
  • 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 tensile stress at the surface at the bottom of the slot for the reception of the flyweight, this making it possible to limit the formation of weakened zones.
  • the invention relates to a balance 1 for a timepiece movement.
  • the balance comprises rigid parts formed 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 elastic arm 5 comprising a first end 5B integral with an arm 4 of said balance 1, and a second distal end 5A free relative to the hub 2, to at least one arm 4, and to the serge sector 3, the free end 5A being able to deform in the plane of the serge and tighten a weight 6 on the balance.
  • the balance also has a slot 7 adapted to receive the weight 6, the slot 7 being delimited on the one hand by the elastic arm 5, and on the other hand by the balance arm 4, the elastic arm 5 being permanently biased towards the arm 4 of the balance 1 delimiting the slot 7.
  • the elastic arm 5 extends substantially radially relative to the pivot axis A, or parallel to a radial from the pivot axis A.
  • the elastic arm 5 is inclined in the direction of the balance arm 4 so that the horizontal distance between the arm 4 and the elastic arm 5 is increasing between the distal end 5A and the first end 5B integral with the arm 4.
  • the elastic arm 5 defines a slope relative to the arm 4, the slope having an elevation angle ⁇ of between 1 ° and 5 °.
  • the elastic arm 5 is configured to be moved away vertically from its rest position according to a vertical displacement of the elastic arm 5 of between 1 ⁇ m and 100 ⁇ m to ensure a plastic deformation at the bottom of the slot, this vertical displacement also depending on the diameter of the foot of the weight. to establish.
  • the elastic arm 5 is configured to pass from a so-called rest position, in which the elastic arm is not subjected to any stress, to a stressing position in which the free distal end 5A of the elastic arm 5 is displaced perpendicularly with respect to the balance arm 4 in the plane of the rim from its rest position so as to obtain a plastic deformation in a first zone 71 at the level of the bottom 70 of the slot 7 over a thickness between 1 ⁇ m and 300 ⁇ m from the bottom of the slot.
  • bottom of the slot or bottom of the slot is meant the interior junction zone between the elastic arm 5 and the balance arm 4.
  • the movement of the free distal end 5A of the elastic arm 5 from its rest position to the position of stress for the introduction of the weight 6 also causes an elastic deformation in a second zone 72 between the neutral fiber F of the elastic arm 5 and the bottom 70 of the slot, this second zone 72 being located between the first zone 71 and the neutral fiber F of the elastic arm and tending to return the elastic arm 5 to its rest position
  • the vertical displacement of the free distal end 5A of the elastic arm 5 is between 1 ⁇ m and 5 ⁇ m from its rest position and is sufficient to plastically deform the bottom of the slot 7.
  • the inventor was surprised to find that by deforming the bottom of the slot in the plastic field, contrary to the habits of a person skilled in the art who seeks to remain in the elastic range, this made it possible to stress the bottom of the slot in compression and no longer in traction as usual in the state of the art.
  • the main advantage of this is to compensate for the defects that may form at the bottom of the slot, such as microcracks, this zone working in compression and it therefore becomes less subject to these defects.
  • the slot 7 has an opening 9 allowing the end 5A of the elastic arm to move perpendicularly with respect to the balance arm 4 in the plane of the rim and to be in contact with the weight 6 to clamp it against the arm of the lever. balance when the latter is placed in the slot 7.
  • 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 stroke of the weight 6 at the level of the elastic arm 5, in a direction parallel to the pivot axis A, or even to immobilize it in this direction.
  • the balance arm includes 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 7.
  • the rod 62 of the weight extends along an axis passing through the center of the weight 6, once clamped in the clamping member 5, the weight is angularly orientable around this axis by means of a tool on the profile adjustment 63.
  • the weight 6 has an unbalance around this axis, which results for example from a flat 64 made on the head 61.
  • an arm 4 not having a notch would also allow the weight 6 to be held in place by tightening the elastic arm 6.
  • the slot 7 extends radially relative to the pivot axis A, or parallel to a radial from the pivot axis A.
  • Such an embodiment is advantageous because it deforms the rim 3 of the balance 1 very little. , the deformation during assembly of the weights 3 being barely measurable with the usual metrology means.
  • the end 5B of the elastic arm 5 is integral with the arm 4, which is disposed substantially radially with respect to the pivot axis A.
  • the distal end 5A is further from the pivot axis A than the end 5B.
  • the elastic arm is arranged to deform during assembly of the weight 6 to the balance, the free end 5A of the arm elastic 5 being able to move perpendicularly, in the plane of the rim, relative to the arm 4.
  • 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 0.1N.
  • the dimensions of the elastic arm 5 make it possible to store a significant elastic energy resulting from the deformation of the arm, the stored deformation energy generating a restoring force on the rod of the weight clamped by the elastic arm 5, which ensures its holding. in force and torque in the notch 11.
  • the invention makes it possible, by the asymmetry of the elastic arm 5, to obtain a satisfactory holding force for the weight and to overcome the drawbacks associated with the formation of zones under tension when the arm is at rest on the weight. 6.
  • the invention also relates to an equipped balance comprising such a balance 1, and at least one weight 6 comprising a rod 62, the minimum diameter of which is greater than the width of the slot 7 in the free state, and the maximum diameter of which is less. to the width of the slot 7 when the elastic arm 5 is moved away from the rigid part of the rocker 1 delimiting the slot 7 under the effect of a separation force applied to the elastic arm 5.
  • the invention also relates to a balance 1 which comprises a plurality of elastic arms 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.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Liquid Crystal Substances (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Micromachines (AREA)
EP19217646.9A 2019-12-18 2019-12-18 Unruh für uhrwerk Withdrawn EP3839655A1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP19217646.9A EP3839655A1 (de) 2019-12-18 2019-12-18 Unruh für uhrwerk
DE212020000784.5U DE212020000784U1 (de) 2019-12-18 2020-10-22 Unruh für eine Uhr
CN202090001023.3U CN219202142U (zh) 2019-12-18 2020-10-22 用于钟表机芯的摆轮、钟表机芯和钟表
PCT/EP2020/079811 WO2021121738A1 (fr) 2019-12-18 2020-10-22 Balancier d'horlogerie
TW109137827A TWI767384B (zh) 2019-12-18 2020-10-30 時針擺輪

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19217646.9A EP3839655A1 (de) 2019-12-18 2019-12-18 Unruh für uhrwerk

Publications (1)

Publication Number Publication Date
EP3839655A1 true EP3839655A1 (de) 2021-06-23

Family

ID=68965680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19217646.9A Withdrawn EP3839655A1 (de) 2019-12-18 2019-12-18 Unruh für uhrwerk

Country Status (5)

Country Link
EP (1) EP3839655A1 (de)
CN (1) CN219202142U (de)
DE (1) DE212020000784U1 (de)
TW (1) TWI767384B (de)
WO (1) WO2021121738A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4194964A1 (de) * 2021-12-10 2023-06-14 Nivarox-FAR S.A. Unruh mit trägheitsregulierung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH705238A2 (fr) 2011-07-15 2013-01-15 Nivarox Sa Balancier à réglage d'inertie pour mouvement d'horlogerie.
CH712711A2 (fr) * 2016-07-18 2018-01-31 Eta Sa Mft Horlogères Suisse Procédé de réglage de la marche d'une pièce d'horlogerie.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW497015B (en) * 2000-12-07 2002-08-01 Ebauchesfabrik Eta Ag Method for adjusting the oscillation frequency of a sprung balance for a mechanical timepiece
EP1705534A1 (de) * 2005-03-23 2006-09-27 Patek Philippe Sa Trägheitsunruh
US9645551B2 (en) * 2011-12-22 2017-05-09 The Swatch Group Research And Development Ltd Method of improving the pivoting of a wheel set
EP2990883A1 (de) * 2014-08-29 2016-03-02 Nivarox-FAR S.A. Spiralunruh-Einheit für Uhrwerk

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH705238A2 (fr) 2011-07-15 2013-01-15 Nivarox Sa Balancier à réglage d'inertie pour mouvement d'horlogerie.
CH712711A2 (fr) * 2016-07-18 2018-01-31 Eta Sa Mft Horlogères Suisse Procédé de réglage de la marche d'une pièce d'horlogerie.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4194964A1 (de) * 2021-12-10 2023-06-14 Nivarox-FAR S.A. Unruh mit trägheitsregulierung

Also Published As

Publication number Publication date
DE212020000784U1 (de) 2022-11-10
WO2021121738A1 (fr) 2021-06-24
CN219202142U (zh) 2023-06-16
TWI767384B (zh) 2022-06-11
TW202136935A (zh) 2021-10-01

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