EP3211486B1 - Procede de fixation d'un spiral pour mouvement d'horlogerie mecanique - Google Patents

Procede de fixation d'un spiral pour mouvement d'horlogerie mecanique Download PDF

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Publication number
EP3211486B1
EP3211486B1 EP16157390.2A EP16157390A EP3211486B1 EP 3211486 B1 EP3211486 B1 EP 3211486B1 EP 16157390 A EP16157390 A EP 16157390A EP 3211486 B1 EP3211486 B1 EP 3211486B1
Authority
EP
European Patent Office
Prior art keywords
hairspring
spiral
glue
adhesive
balance spring
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
EP16157390.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3211486A1 (fr
Inventor
Julien Christan
Thierry Conus
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.)
ETA SA Manufacture Horlogere Suisse
Original Assignee
ETA SA Manufacture Horlogere Suisse
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 ETA SA Manufacture Horlogere Suisse filed Critical ETA SA Manufacture Horlogere Suisse
Priority to EP18183176.9A priority Critical patent/EP3432083A1/fr
Priority to EP16157390.2A priority patent/EP3211486B1/fr
Priority to US15/298,498 priority patent/US10018965B2/en
Priority to TW105134437A priority patent/TWI701528B/zh
Priority to JP2016237311A priority patent/JP6259056B2/ja
Priority to CN201611121756.7A priority patent/CN107121918B/zh
Publication of EP3211486A1 publication Critical patent/EP3211486A1/fr
Application granted granted Critical
Publication of EP3211486B1 publication Critical patent/EP3211486B1/fr
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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
    • 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
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/32—Component parts or constructional details, e.g. collet, stud, virole or piton
    • G04B17/325—Component parts or constructional details, e.g. collet, stud, virole or piton for fastening the hairspring in a fixed position, e.g. using a block

Definitions

  • the present invention relates to a method of fixing a spiral for a mechanical clockwork movement.
  • the present invention relates in particular to a process for bonding silicon spirals.
  • the balance spring constitutes with the balance the time base of the mechanical timepieces.
  • the spiral is schematically in the form of a very thin spring wound in concentric turns and a first end called the first turn inside is connected to a ferrule, and a second end called last turn outside is connected at a peak.
  • the oscillating system comprises a sprung-balance pair and an escapement.
  • the balance consists of a balance shaft connected to a serge by means of radial arms and pivoted between a first and second bearings.
  • the hairspring is fixed via a first turn inside to the balance shaft for example by means of a ferrule.
  • the hairspring is fixed via a last outer turn at a point of attachment formed by a pin possibly carried by a peg holder.
  • the exhaust comprises a double plate consisting of a large plate which carries a plateau pin and a small plate in which is formed a notch.
  • the escapement also includes an anchor with an anchor axis pivoted between first and second bearings.
  • the anchor consists of a rod that connects a fork to an input arm and an output arm.
  • the fork is made up of an entrance horn and an exit horn between which a dart extends.
  • the travel of the fork is limited by an entry limiting pin and an output limiting pin that can be made from one piece with an anchor bridge.
  • the inlet arm and the output arm respectively carry an entry pallet and an exit pallet.
  • the anchor cooperates with an escape wheel comprising an exhaust wheel axle pivoted between a first and a second bearing.
  • the material used for making the spirals is usually an alloy based on cobalt, nickel and chromium. Ductile, such an alloy must resist corrosion. Recent developments, however, propose making the silicon spirals. Silicone spirals are more accurate than their steel predecessors. Their cost price is nevertheless higher. Due to their small dimensions, such spirals are however difficult to assemble.
  • the hairspring is an Archimedes spring, wound in the horizontal plane, which serves only one function: once paired with a pendulum, it must turn in one direction, then in the other, that is to say swing around its equilibrium position. He is said to breathe. Now, everything helps to prevent a hairspring from always oscillating at the same frequency.
  • the hairspring must in particular withstand the oxidation and magnetism that sticks the turns between them and stops the watch.
  • the influence of atmospheric pressure is weak. For a long time, it was the temperature that was the crux of the problem because the heat expands the metal, the cold shrinks it.
  • the hairspring must also be elastic to deform and yet still find its shape.
  • the hairspring must be isochronous. No matter how far the spiral turns, it must always be the same time to oscillate. If the hairspring contracts by a few degrees, it accumulates little energy and slowly returns to its equilibrium position. If the hairspring is moved away from much of its equilibrium position, it goes very quickly in the opposite direction. The important thing is that these two trips are made in the same duration. The underlying idea is that the energy available to the hairspring is not constant and that it must still work whether the watch is fully recovered or that it is in its last hours of power reserve.
  • the material used for making the spirals is usually an alloy based on cobalt, nickel and chromium. Ductile, such an alloy must resist corrosion. Recent developments, however, propose making the silicon spirals. Silicone spirals that are especially insensitive to magnetism are more accurate than their steel predecessors. Their cost price is nevertheless higher.
  • Requirement WO 2014/023584 discloses a method of fixing a last turn outside a watch hairspring in a piton, this method comprising the step of sticking the last turn to the outside of the watch hairspring by means of a fluid glue .
  • the present invention aims to overcome the aforementioned drawbacks as well as others by providing a method of fixing a hairspring which does not induce mechanical stresses in such a hairspring and does not separate it from its position rest.
  • the subject of the present invention is a process for fixing a last turn outside a watch spiral in a peak, this process comprising the step of sticking the last turn outside the clockwork spiral by means of a fluid adhesive whose viscosity is between 200 and 400 mPa.s.
  • the last turn outside of the watch winder is glued in a groove in the peak.
  • the fluid adhesive is polymerizable by means of ultraviolet radiation.
  • the present invention provides a method of fixing a watchmaker's hairspring in which the last turn outside the watch hairspring is glued to the peak by means of a drop of fluid glue.
  • Fluid glue can also be a glue that hardens on contact with air.
  • the watch winder is formed of a coil of concentric turns comprising a last turn on the outside which ends with a wafer which is thicker than the other spiral turns, the wafer being provided with at least one notch to promote the adhesion of the glue once it hardened.
  • the present invention proceeds from the general inventive idea of sticking the last coil outside a hairspring on a peak by means of a fluid adhesive whose viscosity is between 200 and 400 mPa.s. It has indeed been observed that when the last turn is glued to the outside of a hairspring, for example by means of a heat-fusible glue, the The viscosity of such an adhesive is such that it exerts capillary forces on the hairspring which tend to move the hairspring away from its rest position and to induce in the latter mechanical stresses which considerably impair its running accuracy.
  • the glue used is a fluid adhesive which hardens on contact with air.
  • the fluid adhesive is an adhesive which cures by polymerization under the effect of exposure to ultraviolet radiation.
  • photopolymerizable glue is meant a polymer adhesive capable of polymerizing under the effect of ultraviolet radiation. This is why photo-polymerizable adhesives are usually referred to as UV glue.
  • Photopolymerizable adhesives have a large number of advantages: they are monocomponent, their polymerization is fast and can, in some cases, be done without solvent, their application is easy, they allow to carry out heat-sensitive collages and do not have pot life or pot life in Anglo-Saxon terminology. Pot life is the period of time available to use a resin before complete curing from the moment when the two components of the resin are mixed, and the chemical reaction takes place.
  • a photo-polymerizable glue consists of a base resin, a photoactivator and, where appropriate, one or more additives.
  • the base resin which may be a monomer or an oligomer has well-defined functional groups which, after UV polymerization, will condition the physical and resulting polymer.
  • the polymerization reaction may be based either on radical mechanisms to which the acrylic components are subjected, for example, or on cationic mechanisms to which the epoxy components are subjected for example.
  • a radical-type reaction the photo-polymerization phenomenon is interrupted as soon as the exposure to ultraviolet radiation ceases.
  • radical systems of acrylic type are subject to inhibition by oxygen.
  • the photo-polymerization phenomenon continues even after interruption of the UV illumination and is not inhibited by oxygen.
  • These short-wave reactive salts (200-300 nm) can be used alone or in combination with photo-sensitizers, ie molecules capable of absorbing light and transferring excitation to another molecule, for greater efficiency.
  • the photoactivators must have excellent reactivity, a suitable absorption spectrum, a lack of yellowing, good stability, compatibility with the monomers and substrates, minimum odor and non-toxicity.
  • composition of a photo-polymerizable adhesive may be supplemented by one or more additives among which mention may be made of co-initiators, that is to say molecules which do not participate in the absorption of light but which contribute the production of reactive particles, antioxidants, UV stabilizers, reactive diluents or adhesion promoters or surfactants.
  • co-initiators that is to say molecules which do not participate in the absorption of light but which contribute the production of reactive particles, antioxidants, UV stabilizers, reactive diluents or adhesion promoters or surfactants.
  • FIG. 1 An exemplary embodiment of the invention is illustrated on the figure 1 attached.
  • an oscillating system for a watch movement generally designated by the general numerical reference 1.
  • This oscillating system mounted on a bridge 2 of the turntable of a watch movement, comprises a watch winder 4 formed of a very thin spring wound in concentric turns and which is fixed via a first turn inside 6 to a balance shaft 8 by means of a ferrule 10.
  • the spiral 4 is fixed via a last outer turn 12 at an attachment point formed by a stud 14 carried by a stud holder or a bridge 16.
  • the oscillating system 1 also comprises a rocker 18 whose axis 8 is connected to a serge 20 by means of radial arms 22.
  • the balance shaft 8 is pivoted between a first and a second bearing 24, only one of which is visible in the drawing. and which are hunted in bridge 2 and platinum of the watch movement.
  • the oscillating system 1 comprises a double-plate 26 consisting of a large plate 28 which carries a plate pin 30 and a small plate 32 in which is formed a notch 34.
  • the oscillating system finally comprises an anchor 36 whose axis 38 is pivoted between a first and a second pivot 40, only one of which is visible in the drawing.
  • the anchor 36 consists of a rod 42 which connects a fork 44 to an input arm 46 and an output arm 48.
  • the fork 44 consists of an input horn 50 and a horn of output 52 between which extends a stinger 54.
  • the travel of the fork 44 is limited by an input limiting pin and an output limiting pin (not visible in the drawing) that can be made of a piece with a anchor bridge.
  • the inlet arm 46 and the output arm 48 respectively carry an inlet pallet 56 and an outlet pallet 58.
  • the anchor 36 cooperates with an escape wheel 60 comprising an exhaust wheel axle 60 pivoted between a first and a second pivot 64.
  • the last outer turn 12 of the spring 4 is glued to the stud 14 by means of a drop of photo-polymerizable adhesive 66.
  • This drop of glue is for example deposited by means of an automated dispensing device such as a syringe still known by its Anglo-Saxon name "dispenser”.
  • the drop of photo-polymerizable glue 66 is polymerized by exposure to light radiation produced by an ultraviolet light source 68. Exposure to ultraviolet light is sufficient to cause complete polymerization of the glue.
  • the first turn inside the spiral 4 can also be glued to the ferrule 10 by means of the same UV conductive glue as that used for gluing the spiral 4 to the stud 14.
  • the last turn outside 12 of the hairspring 4 is arranged in a groove 70 formed at the upper end of the pin 14.
  • the drop of photo-polymerizable adhesive 66 has been deposited using a syringe and, under the effect of the gluing force of the glue, the end of the last turn outside 12 of the spiral 4 has moved slightly away from its rest position and touches the walls of the groove 70, which is very unfavorable to the precision of the spiral.
  • the end of the last turn outside 12 of the spiral 4 is spontaneously returned to its rest position.
  • the photo-polymerizable adhesive 66 is very fluid, its viscosity being between 200 and 400 mPa.s, so that the adhesive does not oppose the spontaneous return movement of the end of the spiral 4 in its equilibrium position. Therefore, the fixing operation of the hairspring 4 induces no mechanical stress in the hairspring 4, which is very favorable to the accuracy of the latter.
  • the last turn outside 12 of the spiral 4 ends with a plate 72 made in one piece with the end of the last turn outside 12 and which is thicker than the other spiral windings 4.
  • the cross section of the wafer is 0.1x0.1 mm 2 and its length L is 0.6 millimeters.
  • the wafer 72 is provided with at least one and, preferably, two notches 74 to promote the adhesion of the glue once it has hardened.
  • the last turn outside 12 is not concentric with the other turns of the spiral 4. The latter turns outside 12 slightly away from the center of the turn 4 so that the penultimate turn 68 which precedes it does not touch the peak 14.
  • the present invention is not limited to the embodiments which have just been described and that various modifications and simple variants can be envisaged by those skilled in the art without departing from the scope of the invention as defined by the appended claims.
  • the last turn outside 12 of the spiral 4 can be glued to the stud 14 by means of a drop of glue which hardens on contact with the air .
  • the material used for making the spirals is usually an alloy based on cobalt, nickel and chromium. Ductile, such an alloy must resist corrosion.
  • Silicone spiral means a spiral made of a material comprising monocrystalline silicon, doped monocrystalline silicon, polycrystalline silicon, doped polycrystalline silicon, porous silicon, silicon oxide, quartz, silica, silicon nitride or silicon carbide. Of course, when the silicon-based material is in crystalline phase, any crystalline orientation can be used.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Springs (AREA)
EP16157390.2A 2016-02-25 2016-02-25 Procede de fixation d'un spiral pour mouvement d'horlogerie mecanique Active EP3211486B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP18183176.9A EP3432083A1 (fr) 2016-02-25 2016-02-25 Spiral pour mouvement d'horlogerie mecanique
EP16157390.2A EP3211486B1 (fr) 2016-02-25 2016-02-25 Procede de fixation d'un spiral pour mouvement d'horlogerie mecanique
US15/298,498 US10018965B2 (en) 2016-02-25 2016-10-20 Method for attachment of a balance spring for a mechanical timepiece movement and balance spring attached by such a method
TW105134437A TWI701528B (zh) 2016-02-25 2016-10-25 將游絲附接於機械式時計機芯之方法及利用此方法所附接的游絲
JP2016237311A JP6259056B2 (ja) 2016-02-25 2016-12-07 機械式時計ムーブメント用のヒゲゼンマイを取り付ける方法、及び該方法によって取り付けられるヒゲゼンマイ
CN201611121756.7A CN107121918B (zh) 2016-02-25 2016-12-08 为机械钟表机芯附装游丝的方法和通过该方法附装的游丝

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16157390.2A EP3211486B1 (fr) 2016-02-25 2016-02-25 Procede de fixation d'un spiral pour mouvement d'horlogerie mecanique

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP18183176.9A Division EP3432083A1 (fr) 2016-02-25 2016-02-25 Spiral pour mouvement d'horlogerie mecanique
EP18183176.9A Division-Into EP3432083A1 (fr) 2016-02-25 2016-02-25 Spiral pour mouvement d'horlogerie mecanique

Publications (2)

Publication Number Publication Date
EP3211486A1 EP3211486A1 (fr) 2017-08-30
EP3211486B1 true EP3211486B1 (fr) 2018-09-26

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ID=55436047

Family Applications (2)

Application Number Title Priority Date Filing Date
EP18183176.9A Withdrawn EP3432083A1 (fr) 2016-02-25 2016-02-25 Spiral pour mouvement d'horlogerie mecanique
EP16157390.2A Active EP3211486B1 (fr) 2016-02-25 2016-02-25 Procede de fixation d'un spiral pour mouvement d'horlogerie mecanique

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP18183176.9A Withdrawn EP3432083A1 (fr) 2016-02-25 2016-02-25 Spiral pour mouvement d'horlogerie mecanique

Country Status (5)

Country Link
US (1) US10018965B2 (zh)
EP (2) EP3432083A1 (zh)
JP (1) JP6259056B2 (zh)
CN (1) CN107121918B (zh)
TW (1) TWI701528B (zh)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI774925B (zh) * 2018-03-01 2022-08-21 瑞士商Ｃｓｅｍ瑞士電子及微技術研發公司 製造螺旋彈簧的方法
EP3570118B1 (fr) * 2018-05-14 2022-01-12 ETA SA Manufacture Horlogère Suisse Piton pour la fixation d'un ressort spiral d'un mouvement d'horlogerie et procédé de fabrication d'un tel piton
JP6548240B1 (ja) * 2018-06-29 2019-07-24 セイコーインスツル株式会社 ひげぜんまい、調速機、時計用ムーブメント及び時計
EP3859449A1 (fr) * 2020-01-30 2021-08-04 ETA SA Manufacture Horlogère Suisse Cordon conducteur de spiral

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DE2333446A1 (de) * 1973-06-30 1975-01-16 Junghans Gmbh Geb Verfahren zum befestigen des aeusseren endes einer unruhspirale
FR2255648A1 (en) * 1973-12-21 1975-07-18 Epsilon Sarl Watch balance spring fixing method - involves inserting end of spring into fusible adhesive in pin recess
FR2283475A1 (fr) * 1973-12-21 1976-03-26 Epsilon Sarl Procede pour la fixation de l'extremite exterieure d'un ressort spiral a un piton et piton pour la mise en oeuvre du procede
FR2276621A1 (fr) * 1974-06-25 1976-01-23 Epsilon Sarl Piton pour l'extremite d'un ressort spiral pour l'horlogerie ou pour des appareils de mesures
JPS521172U (zh) * 1975-06-23 1977-01-06
JPS5255564A (en) * 1975-10-31 1977-05-07 Citizen Watch Co Ltd Method and device for fixing outside end of balance spring
JPH0798674B2 (ja) * 1986-12-15 1995-10-25 セイコーエプソン株式会社 時計側の接着固定構造
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Also Published As

Publication number Publication date
EP3211486A1 (fr) 2017-08-30
JP2017151080A (ja) 2017-08-31
US10018965B2 (en) 2018-07-10
EP3432083A1 (fr) 2019-01-23
TWI701528B (zh) 2020-08-11
TW201732466A (zh) 2017-09-16
CN107121918A (zh) 2017-09-01
CN107121918B (zh) 2019-09-17
JP6259056B2 (ja) 2018-01-10
US20170248918A1 (en) 2017-08-31

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