EP2748684A1 - Système oscillant pour mouvement d'horlogerie - Google Patents
Système oscillant pour mouvement d'horlogerieInfo
- Publication number
- EP2748684A1 EP2748684A1 EP13740039.6A EP13740039A EP2748684A1 EP 2748684 A1 EP2748684 A1 EP 2748684A1 EP 13740039 A EP13740039 A EP 13740039A EP 2748684 A1 EP2748684 A1 EP 2748684A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oscillating system
- electrically conductive
- conductive path
- oscillating
- anchor
- 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.)
- Granted
Links
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
- G04B17/32—Component parts or constructional details, e.g. collet, stud, virole or piton
Definitions
- the present invention relates to an oscillating system for a watch movement.
- the present invention relates in particular to an oscillating system comprising a watch winder from which the electrostatic charges can be eliminated.
- spirals that constitute with the balance the time base of the mechanical timepieces. These spirals are schematically in the form of a very thin spring wound in concentric turns and a first end is connected to a shell and a second end is connected to a pin.
- 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 propose to realize the spirals in silicon. Due to their very small dimensions and the friction between the turns, the spirals tend to charge in static electricity, so that the turns stick to each other. The spirals are then unusable as is.
- the present invention provides an oscillating system for a watch movement comprising a watch winder from which the electrostatic charges can be eliminated.
- the present invention relates to an oscillating system mounted on a platen of a watch movement, this oscillating system comprising a watch winder fixed via a first turn inside to an axis of a pendulum by means of a ferrule , and fixed via a last outer turn to a peak, characterized in that at least one of the components of the oscillating system is connected to an electrical ground via an electrically conductive path.
- the present invention provides an oscillating system for a watch movement comprising a watch winder connected to an electrical mass via an electrically conductive path, which allows the electrostatic charges possibly accumulated on the surface of the balance spring. flow to the electrical ground and be eliminated.
- the oscillating system comprises a sprung balance 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 consists 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 input arm and the output arm respectively carry an entry pallet and a pallet of exit.
- the anchor cooperates with an escape wheel comprising an exhaust wheel axle pivoted between a first and a second bearing.
- the spiral is glued to the stud by means of a photo-polymerizable glue.
- photopolymerizable glue 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 chemical properties of the 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.
- the base resin may be chosen from:
- epoxide compounds which include cycloaliphatic epoxides and glycidyl epoxides, vinyl ethers and electron-rich vinyl compounds;
- a photoactivator is a molecule that absorbs light and forms a reactive chemical species. These photoinitiator compounds generally generate a hyperacid which allows the cross-linking of the cationic systems. These systems are therefore inhibited in basic or wet medium. On the other hand, they are not inhibited by the presence of oxygen.
- Conventional cationic photoactivators include:
- dialkylphenacylsulfonium salts These salts which react at short wavelengths (200-300 nm) can be used alone or in combination with photo-sensitizers, that is to say molecules capable of absorbing light and transferring the 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.
- the glue is polymerized by exposure to ultraviolet radiation, and then the glue after polymerization is sprayed with conductive particles, for example dispersed in a spray.
- the photo-polymerizable adhesive intended to be used in the context of the present invention is loaded with conductive particles.
- the conduction in the UV adhesive is carried out by contacting the conductive particles during the removal of the polymer at the time of crosslinking. It is therefore necessary to find the appropriate compromise between a minimum concentration of these charges in order to obtain a good conductivity and a maximum concentration in order to preserve good mechanical properties of the adhesive.
- the invention because of the conductivity of the UV adhesive, it allows the electrostatic charges accumulated on the surface of the hairspring to flow towards the mass formed by the peak. Moreover, the polymerization of the glue by exposure to UV radiation induces no mechanical stress, nor any need to manipulate the spiral-piton assembly. Simply drop a drop of glue at the point of connection between the hairspring and the bolt, then expose the assembly to UV radiation for the polymerization to occur and the glue hardens.
- the invention is particularly well suited to bonding a silicon spiral which is known that the turns have a strong tendency to charge electrostatically and to stick to each other.
- the polymerization time is very short and can simultaneously expose a large number of spiral / piton sets to the radiation of an ultraviolet light source, which allows to significantly increase production rates.
- An example of a photo-polymerizable conductive adhesive well suited to the requirements of the invention is such a glue loaded with silver particles such as the glue sold under the designation Epotek H20S.
- Silver is a noble material less expensive than gold by example and its oxide is also conductive.
- the silver particles are flake-shaped, which allows them, because of their large surface area, to offer a higher number of contact points and thus to allow a better conductivity than particles of spherical shape.
- the size of the silver particles is generally between 1 and 20 microns.
- the UV glue is loaded at 45% by weight with silver particles. With such a high charge of silver particles, the glue can not be cured by exposure to UV radiation alone, and a subsequent firing step is required, which can be problematic.
- Such a conductive adhesive can indeed be polymerized radically or cationically under the effect of exposure to ultraviolet radiation, the subsequent firing step can even be avoided in the case of cationic polymerization. Indeed, because of their high conductivity and their specific ratio (length / diameter) and surface area, the carbon nanotubes percolate and are electron-conducting at much lower concentrations in the UV glue, so that the polymerization of the it is facilitated and does not require additional cooking step.
- UV glue An example of such a UV glue is given by the following composition:
- composition is given purely for illustrative and not limiting purposes only and that other compositions of a UV conductive adhesive according to the invention can be envisaged without departing from the scope of the present invention as defined by the appended claims.
- FIG. 1A is a general perspective view of an oscillating system for a watch movement to which the present invention applies;
- Figure 1 B is a view similar to that of Figure 1A, the balance has been omitted;
- FIG. 2 is a detailed view of the oscillating system of FIG. 1 on which the entry and exit pins which limit the deflection of the fork and which come from the material with the anchor bridge and the large one are visible; platter of the double-platter which carries the plateau peg and the fork of which the dart has been omitted;
- FIG. 3 schematically illustrates a hairspring, an outer end is glued to a peak by means of a photopolymerizable conductive adhesive
- FIG. 4 schematically illustrates a spiral made of silicon with a ferrule which comes from the material with the spiral and which is glued on its axis by means of the UV-polymerizable conductive adhesive
- FIGS. 5A and 5B schematically illustrate the bonding of a watch hairspring to a peak by means of a drop of non-conductive photopolymerizable adhesive on which electrically conductive particles are sprayed after polymerization.
- the present invention proceeds from the general inventive idea of connecting a hairspring of a clock oscillating system to an electric mass via an electrically conductive path to allow electrostatic charges possibly accumulated on the surface of the hairspring to flow. .
- electricity conductive at least the parts of the clock oscillating system that are on the path of leakage of electrostatic charges.
- a large number of electrostatic charge flow paths can be envisaged, which makes it possible to to adapt to any type of watchmaking construction.
- FIGS. 1A and 1B An exemplary embodiment of the invention is illustrated in FIGS. 1A and 1B appended to the present patent application.
- 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 a point d fastener formed by a stud 14 carried by a bolt carrier 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 (see in particular FIG. 2) a double plate 26 consisting of a large plate 28 which carries a plate pin 30 and a small plate 32 in which a notch 34 is formed.
- the oscillating system finally comprises an anchor 36, an axis 38 is pivoted between a first and a second bearing 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 56 and an output limiting pin 58 which can be made in one piece with an anchor bridge 60.
- the inlet arm 46 and the output arm 48 respectively carry an inlet pallet 62 and an outlet pallet 64.
- the anchor 36 cooperates with an escape wheel 66 comprising an exhaust wheel pin 66 pivoted between a first and a second bearing 70 which are in contact with the bridges 2 of the plate. If necessary, the active length of the hairspring 4 is adjusted by means of a racket 72.
- an electrical connection between these components and the spiral 4 can be achieved by driving, welding, soldering or by means of an electric wire.
- the elements of the oscillating system 1 such as the anchor 36 or the escape wheel 66 which are on the leakage path of the electrostatic charges are made of a material with little or no electrically conductive electricity such as silicon or diamond, it is proposed to dope silicon or diamond by means of phosphorus or boron to make the material more conductive.
- Another technique that can be envisaged for making the elements of the oscillating system 1 that are not naturally conductive and which are on the leakage path of the electrostatic charges conductive consists of coating these elements with a layer of a conductive material such as aluminum.
- This layer of conductive material may be deposited for example by atomic layer deposition, a technique better known by its Anglo-Saxon name Atomic Layer Deposition or ALD.
- ALD Atomic Layer Deposition
- the various bearings between which are pivoted the balance shaft 8, the axis 38 of the anchor 36 and the axis 68 of the escape wheel 66 include contact elements of the stone type.
- Another technique for creating the leakage path of the electrostatic charges consists in using for these stones and for the bearings a lubrication oil rendered electrically conductive by being for example loaded with graphite particles.
- the same conductive lubricating oil can be used for the entry and exit pallets 62 and 64.
- the entry and exit pallets 62 and 64 as well as the Bearing stones are typically made of ruby or synthetic poly-ruby that can be obtained by sintering.
- the ruby and the poly-ruby can therefore be made conductive by doping at the time of sintering.
- the hairspring it can be made of quartz or sapphire which can be made conductive by ion implantation. Another possible solution is to coat these materials (ruby, poly-ruby and quartz) with a conductive layer.
- the last outer turn 12 of the spiral 4 is bonded to the stud 14 by means of a drop 74 of photopolymerizable conductive adhesive. Due to the electrical conductivity of the UV adhesive, the electrostatic particles accumulated on the surface of the coils of the spiral 4 flow towards the mass constituted by the peak 14 and the bridge 16 of the movement stage.
- the drop 74 of photopolymerizable conductive adhesive is polymerized by exposure to light radiation produced by an ultraviolet light source 76. Depending on the nature of the conductive particles and their concentration in the photo-polymerizable adhesive, the exposure to ultraviolet light may be 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 ferrule 10 in the case where the spiral 4 is made of silicon and the ferrule 10 is made of material with the spiral 4, the ferrule 10 can be glued on the axis 8 of the beam 18 by means of the same light-conducting conductive glue as that used to glue the hairspring 4 to the pin 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 piton, the racket or even the bearings between which are pivoted the axis of the balance, the axis of the racket and the axis of the escape wheel are in contact with bridges / platinum conductors electricity.
- the invention applies to a coaxial-type escapement in which the escape wheel works for one of the two pulses with a pallet carried by the double-plate without passing through the anchor.
- the electrically conductive path extends from the hairspring to the escape wheel through the ferrule, the balance shaft, the double tray and the pallet.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Micromachines (AREA)
- Polymerisation Methods In General (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP13740039.6A EP2748684B1 (fr) | 2012-08-07 | 2013-07-25 | Système oscillant pour mouvement d'horlogerie |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP12179555 | 2012-08-07 | ||
| PCT/EP2013/065762 WO2014023584A1 (fr) | 2012-08-07 | 2013-07-25 | Système oscillant pour mouvement d'horlogerie |
| EP13740039.6A EP2748684B1 (fr) | 2012-08-07 | 2013-07-25 | Système oscillant pour mouvement d'horlogerie |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2748684A1 true EP2748684A1 (fr) | 2014-07-02 |
| EP2748684B1 EP2748684B1 (fr) | 2016-05-18 |
Family
ID=48856653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13740039.6A Active EP2748684B1 (fr) | 2012-08-07 | 2013-07-25 | Système oscillant pour mouvement d'horlogerie |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2748684B1 (fr) |
| WO (1) | WO2014023584A1 (fr) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH711141A2 (fr) | 2015-05-26 | 2016-11-30 | FEHR et Cie SA | Procédé de fabrication d'un cadran de montre noir comportant des nanotubes de carbone, et cadran de montre noir obtenu par un tel procédé. |
| EP3211486B1 (fr) * | 2016-02-25 | 2018-09-26 | ETA SA Manufacture Horlogère Suisse | Procede de fixation d'un spiral pour mouvement d'horlogerie mecanique |
| EP3452874B1 (fr) * | 2016-05-02 | 2020-06-10 | Patek Philippe SA Genève | Spiral d'horlogerie |
| US11036184B2 (en) | 2016-12-07 | 2021-06-15 | FEHR et Cie SA | Method of fabrication of a black watch dial, and said black watch dial |
| EP3451076B1 (fr) * | 2017-08-31 | 2020-07-29 | ETA SA Manufacture Horlogère Suisse | Porte-piton pour un mouvement d'horlogerie mécanique |
| FI3859449T3 (fi) * | 2020-01-30 | 2026-03-13 | Eta Sa Mft Horlogere Suisse | Kierukkajousikäyttönauha |
| EP3865954B1 (fr) | 2020-02-12 | 2025-08-13 | Nivarox-FAR S.A. | Procede de fabrication d'un dispositif a lames flexibles monobloc en silicium, pour l'horlogerie |
| EP3954802A1 (fr) * | 2020-08-11 | 2022-02-16 | Omega SA | Composant noir decore de pierres et son procede de fabrication |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH436134A (fr) * | 1965-03-19 | 1967-11-15 | Virola Sa | Procédé de fixation d'un spiral d'horlogerie à l'axe du balancier |
| US3883314A (en) * | 1970-06-29 | 1975-05-13 | Omega Brandt & Freres Sa Louis | Self-lubrication bearing member |
| JPS57191583A (en) * | 1981-05-21 | 1982-11-25 | Seiko Epson Corp | Bonding method for middle of water side and pipe |
| WO2000063749A1 (fr) * | 1999-04-21 | 2000-10-26 | Conseils Et Manufactures Vlg Sa | Mouvement d'horlogerie comprenant un microgenerateur et procede de controle pour mouvements d'horlogerie |
| EP1837721A1 (fr) * | 2006-03-24 | 2007-09-26 | ETA SA Manufacture Horlogère Suisse | Pièce de micro-mécanique en matériau isolant et son procédé de fabrication |
| WO2010142602A1 (fr) * | 2009-06-09 | 2010-12-16 | The Swatch Group Research And Development Ltd | Procédé pour le revêtement de composants micromécaniques d'un système micromécanique, en particulier d'une montre, et composant micromécanique revêtu correspondant |
-
2013
- 2013-07-25 EP EP13740039.6A patent/EP2748684B1/fr active Active
- 2013-07-25 WO PCT/EP2013/065762 patent/WO2014023584A1/fr not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2014023584A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2748684B1 (fr) | 2016-05-18 |
| WO2014023584A1 (fr) | 2014-02-13 |
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