EP1243986A1 - Pièce d'horlogerie comportant une génératrice - Google Patents
Pièce d'horlogerie comportant une génératrice Download PDFInfo
- Publication number
- EP1243986A1 EP1243986A1 EP01201061A EP01201061A EP1243986A1 EP 1243986 A1 EP1243986 A1 EP 1243986A1 EP 01201061 A EP01201061 A EP 01201061A EP 01201061 A EP01201061 A EP 01201061A EP 1243986 A1 EP1243986 A1 EP 1243986A1
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- EP
- European Patent Office
- Prior art keywords
- torque
- rotor
- generator
- barrel
- ref
- 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.)
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Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C10/00—Arrangements of electric power supplies in time-pieces
Definitions
- the present invention relates to a timepiece which comprises a time base, a generator composed in particular of a magnet rotor permanent and at least one coil, a spring barrel coupled to said generator to train it, analog time indication means also trained by said barrel and operating substantially synchronously relative to the time base, as long as the torque supplied by the barrel is greater than or equal to one minimum synchronization torque, generator braking means, and magnetic means having with the rotor, when the generator stops, a torque static positioning to maintain this rotor in a position substantially fixed.
- a device of this type is described in patent EP 0 822 470.
- This document relates to an electronic timepiece comprising an energy source formed of a spring barrel, with manual or automatic winding, coupled to a alternating voltage generator intended to supply an electronic circuit of the piece, a set of timekeeping hands driven by a gear train itself driven by the barrel, braking means for adjusting the speed of rotation of the generator, to brake or stop it, and magnets to prevent rotation of the generator once it has stopped.
- magnets are placed in the vicinity of the periphery of the rotor of the generator. They have a very weak force of attraction and exert a weak static positioning torque on the rotor, torque which, in order not to prevent restart, must not be greater than the torque that the barrel is capable of supply when the power reserve is almost exhausted.
- the minimum synchronization torque corresponds by example to arm one and a half turns of the barrel spring and that for seven turns complete with the winder, we go up one turn of the barrel spring, so you have to count at least ten winding turns before the watch runs again synchronized.
- the invention therefore aims to overcome the drawbacks of the prior art mentioned above by providing a device for stopping the timepiece allowing to keep a barrel torque close to the minimum synchronization torque when the part does not work, by stopping the generator as soon as the reserve of walking is no longer sufficient for a substantially synchronous running of the timepiece.
- the invention relates to a stop device for a timepiece of the type mentioned above, characterized in that the braking means of the generator are operated to stop the generator as soon as operation means of time indication is no longer substantially synchronous with the base of time and in that the magnetic means are arranged in such a way that the static positioning torque, which they exert on the generator rotor, i.e. greater than or substantially equal to a reference torque for which the torque exerted by the barrel on the rotor is equal to the minimum synchronization torque.
- the choice of a magnet taking into account the above-mentioned uncertainties corresponds to a static positioning torque C T between the magnet and the rotor equivalent to a torque of the barrel for winding about 4 turns.
- the generator is stopped for arming the barrel by about 1.5 turns.
- the generator is not restarted before a minimum of approximately 17 winding turns. If it is assumed that the wearer of the watch makes one and a half turn of the watchwinder with each manipulation, he must then carry out a dozen manipulations to restart his watch, which can lead him to think that his watch is not working more.
- a second aspect of the invention relates a stop device further comprising means for adjusting the torque of static positioning between the magnet and the rotor to adjust this torque for that it is substantially equal to the reference torque for which the torque exerted by the barrel on the rotor is equal to the minimum synchronization torque between the hands and time base.
- a safety factor can be taken to take into account the degradation of the system, in particular, barrel aging and lubrication problems or dirt from the cogs.
- This setting allows the timepiece to be restarted quickly, after approximately 2 to 3 manipulations, while ensuring the synchronization of the means analog time indication with time base.
- the timepiece according to the invention always works so substantially synchronous, the advance of the time indication means relative to the time base can be continuous or jerky. In a preferred mode, the couple minimum synchronization will be taken to ensure continuous synchronous operation of these time indication means with respect to the time base.
- the invention also relates to the associated method for adjusting the static positioning torque between the magnet and the rotor.
- the timepiece according to the invention includes a generator symbolized by the rectangle 1 comprising a magnetic rotor 2 and at least a coil 3. Preferably, three coils placed near the rotor will be used.
- the rotor is mechanically coupled, for example through a gear train 4, to a barrel 5 in which a spring 6 is housed. This can be armed by a winding, manual or automatic, known per se and not shown in the figure.
- the gear train 4 is also coupled to analog time indication means 7, conventionally composed of a set of needles (8, 9, 10) integral in rotation with the rotor 2. As a result, these means 7 rotate as long as the rotor 2 is in motion.
- the generator 1 delivers an alternating voltage at a given frequency. This frequency will preferably be 5.33 turns per second.
- the generator is connected to a full-wave rectifier 11 comprising capacitors smoothing at the output of which is connected a logic control circuit 12.
- the circuit 12 also receives time information. This information is provided to him by a time base 13 in particular consisting of a quartz oscillator 14 which delivers a impulse signal of a determined frequency, commonly 32768 Hz, at different frequency divider stages 15.
- the internal detail of the logic control circuit 12 will not be given here. Indeed, such a circuit is known from the prior art, in particular of document EP 0 822 470.
- This logic control circuit 12 makes it possible to actuate by means of a signal 17 of the switching means 16, formed in particular of an MOS transistor whose source-drain path is connected between the terminals of generator 1.
- These switching means 16 have the role of temporarily short-circuiting the generator 1, in order to be able to regulate its rotation speed. Depending on the time of controlled short circuit, the speed of rotation will be more or less reduced.
- the assembly comprising the logic control circuit 12 and the means of switching 16 constitutes means for braking the generator 1.
- One of the objects of the invention is to obtain a timepiece which functions always synchronized, while conserving the residual energy of the barrel when the part does not work. This is why, when the power reserve of the barrel 5 becomes insufficient to ensure the synchronization of the indication means schedule 7 with respect to time base 13, the braking means serve to stop the generator 1 and therefore the needles 8, 9 and 10 linked to the latter, as well as the spring 6 of the barrel.
- a person skilled in the art knows how to determine, for a timepiece of this type, the number of revolutions of the barrel spring necessary to ensure the synchronization of the hands relative to the time base. This number of revolutions required corresponds to a reference torque C REF for which the torque exerted by the barrel 5 on the rotor 2 is equal to the minimum synchronization torque. For the determination of this torque corresponding to the static positioning torque C P between the magnet and the rotor, this reference torque C REF will preferably be taken with a safety factor f S to take account of the degradation of the system.
- the generator braking means are then used for the stop.
- the switching means 16 then receive a continuous signal 17 from the circuit control logic 12, resulting in a prolonged short circuit of the terminals of the generator 1. The generator speed then becomes almost zero.
- the complete stop of the generator 1 is guaranteed by at least one magnet 18 placed in the vicinity of the periphery of the rotor 2.
- This magnet 18 is arranged so that the static positioning torque C P between the magnet and the rotor is greater than or substantially equal to the reference torque C REF for which the torque exerted by the barrel 5 on the rotor 2 is equal to the minimum synchronization torque C SYNC .
- the torque C P makes it possible to stop the rotor 2 and to keep it substantially fixed, once the braking means are inactive.
- the generator 1 is placed around a shaft 21 integral with a pinion meshing with an intermediate wheel 23, itself meshing with the rest of the cog, not shown here.
- the rotor consists of two flanges, upper 24A and lower 24B, on which an even number are arranged of magnets, respectively 25A and 25B, having alternating polarization. These flanges are mounted on the shaft 21 of the generator. Three coils 3 are disposed between the two flanges 24A and 24B.
- each flange Preferably, six magnets will be used on each flange.
- the magnets 25A and 25B opposite the upper flanges 24A and lower 24B are positioned to attract each other to create a magnetic field closed F specific to the generator. It should be noted that the magnets 25A and 25B used for each flange can be of different thickness.
- the static positioning torque C P between the positioning magnet 18 and the flanges 24A and 24B of the rotor is variable.
- the static positioning torque C P between the magnet 18 and the rotor 2 depends in particular on the distance between the two and on their respective magnetization rate. This is why, in order to obtain a torque C P which is greater than or substantially equal to the reference torque C REF , provision is made to use means for adjusting this torque C P , in a preferred embodiment.
- This adjustment is carried out by means of an adjustment of the position of the magnet 18.
- the magnet 18 is provided for rotationally movable, which makes it possible to easily modify the torque C P , for example during assembly. of the timepiece. It is also possible to provide magnetized means sliding in translation, means making it possible to obtain the same result.
- a magnetized screw 18, driven or screwed in a hole provided for this purpose in the plate or in a bridge of the timepiece this screw having an asymmetry such as a groove 19 indicating the direction of magnetization and allowing a tool to turn this screw.
- the benchmark magnetization also serves as means of action to adjust the orientation of the magnet.
- the reference torque C REF to adjust the torque C P can be taken with a safety factor f S to take account of the degradation of the system.
- the fixing means can be a point of glue, a weld or any other means known to those skilled in the art.
- adjustment means fixed in a non-definitive manner or even not fixed, this in order to allow a professional to re-adjust the torque C P in the event of a malfunction.
- two or more positioning magnets are regularly placed on the periphery of the rotor magnetized in order to eliminate the parasitic friction induced by each magnet positioning.
- the invention also relates to the method for adjusting the static positioning torque C P between the magnet 18 and the rotor 2.
- This method relates to a timepiece comprising the elements shown in FIGS. 1 and 2.
- the objective to be achieved, by means of this method, is to obtain a static positioning torque C P , which is greater than or substantially equal to the reference torque C REF for which the torque exerted by the barrel 5 on the rotor 2 is equal to the minimum synchronization torque C SYNC . It is advantageous to adjust this torque C P so as to have to perform only a minimum of turns before the timepiece again operates in synchronized fashion.
- the torque C P will be adjusted with a safety factor f S taking into account the degradation of the system.
- the magnet 18 is magnetized, for example in the direction of the magnetization mark 19. Then, the magnet 18 should be placed near the rotor 2.
- the magnetic energy of the magnet and its distance from the rotor define the static positioning torque C P between the two.
- This torque C P varies in particular according to the orientation of the magnet 18 relative to the rotor 2. This is why, preferably a magnetized screw movable in rotation is used.
- this magnet 18 is selected and positioned so that the initial torque C P is greater than the reference torque C REF .
- the selection is made with all unfavorable tolerances included, in particular, the rotor leakage fields and the magnetization rate of the magnets.
- the magnet 18 is rotated in the position where the positioning torque C P is maximum.
- This torque C P is maximum when the direction of magnetization is radial to the axis of the rotor 2.
- the reference 19 is placed in the direction of the magnetization.
- this reference 19 can be placed in any other direction as long as it makes it possible to determine the direction of magnetization of the magnet.
- the spring 6 of the barrel is pre-armed by an automaton, not shown, or manually by a number of turns greater than or substantially equal to the number of turns corresponding to C REF .
- a torque taking into account the degradation of the system. For example, for a torque C REF , for which the torque exerted by the barrel on the rotor is equal to the minimum synchronization torque, corresponding to approximately one and a half turns of spring, we will take a torque corresponding to approximately 2 turns of spring.
- This pre-winding of the barrel 5 can be carried out by the ratchet screw or by the winding stem, for example.
- the magnet 18 is moved, by an automaton or manually, until the generator 1 starts up.
- This movement is either in rotation, in the case of a magnetized screw, or in translation, in the case of a sliding magnet.
- the use of a magnetized screw makes it possible to turn the magnet using a simple screwdriver.
- the static positioning torque C P between the magnet 18 and the rotor 2 will decrease and become less than that exerted by the barrel on the rotor.
- the generator 1 is set in motion. This movement is detected by measuring the voltage at the output of the generator.
- the position of the magnet 18 is fixed. This fixation can be obtained by all means known to those skilled in the art, in particular, by bonding or welding.
- FIG. 3 illustrates, according to a preferred embodiment, an example evolution of the torque exerted by the barrel spring on the rotor as a function of the number of spring turns.
- the diagram is drawn in grams per millimeter in function of the number of revolutions made by the barrel, both during cocking and during disarming the spring.
- one round of the barrel corresponds to a duration of approximately eight hours walk from the timepiece.
- all of these values as well as those which will be given below, are only given as example.
- Curve A corresponds to the winding, it starts from a point A1 of total relaxation of the comes out and ends after reassembly of the latter, during which this barrel is between 8 and 9 turns, at a point A2 of maximum arming for which the potential torque of the barrel is approximately 950 gr.mm.
- Curve B represents the disarming of the spring during which this barrel provides energy to the system. This curve begins at point B1 corresponding to a torque value of around 800 gr.mm (this reduction in torque compared to the point A2 is due to the inevitable mechanical losses of the system) and results in a point B2 of total disarming of the spring, this point obviously coinciding with the point A1.
- the diagram also indicates, by a point S on the curve B, the minimum value of synchronization of the torque C SYNC .
- the generator rotor can always reach the nominal rotation speed so that the part keeps the exact time.
- the diagram also indicates, by a point P, the value of the static positioning torque C P between the magnet and the rotor. This value takes into account a safety factor f S due to the degradation of the system.
- the diagram indicates, by a point T, the value of the static positioning torque C T necessary between the magnet and the rotor when the torque adjustment method C P according to the present invention is not implemented, for stop the generator when it is no longer in synchronous operation.
- This operating mode continues for more than 6 turns of the barrel 5 (one little more than forty hours) naturally assuming that spring 6 is not not reassembled manually or automatically. As this time interval, the recurrence of successive braking exerted by the means of braking becomes increasingly weak.
- the hands (8, 9 and 10) are also stopped, which lets the user know that he has to wind the spring of his watch.
- the torque exerted by the user on the winder must be sufficient to allow passage from point S of the disarming curve B to point S 'of the winding curve A.
- the torque C B exerted by the barrel on the rotor is then greater than the torque C P , which allows synchronous restarting of the generator and therefore of the time indication means 7, which is quite similar to a mechanical watch.
- the torque C P is chosen so that the user is forced to make 2 to 3 manipulations to allow the watch to restart.
- this state would nevertheless last for several hours. This does not prevent the user from completely winding his watch to allow it to run longer, in particular by wearing it in the case of automatic winding.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromechanical Clocks (AREA)
Abstract
Description
- la figure 1 représente un schéma simplifié de la pièce d'horlogerie selon l'invention ;
- la figure 2 représente, une vue en coupe de la pièce d'horlogerie au niveau de la génératrice ;
- la figure 3 représente, selon un mode de réalisation préférée, un diagramme d'armage/désarmage d'un barillet à ressort illustrant l'évolution du couple CB exercé par le ressort sur le rotor en fonction du nombre de tours du ressort du barillet ;
Claims (14)
- Pièce d'horlogerie comprenant une base de temps (13), une génératrice (1) composée notamment d'un rotor (2) à aimants permanents et d'au moins une bobine (3), un barillet (6) à ressort couplé à ladite génératrice pour l'entraíner, des moyens d'indication horaire analogique (7) également entraínés par ledit barillet et fonctionnant sensiblement de manière synchrone relativement à ladite base de temps tant que le couple CB fourni par ledit barillet est supérieur ou égal à un couple minimum de synchronisation CSYNC, des moyens de freinage (12, 16) de ladite génératrice, des moyens aimantés (18) ayant avec ledit rotor, lors de l'arrêt de la génératrice, un couple de positionnement statique CP permettant de maintenir ledit rotor dans une position sensiblement fixe, caractérisé en ce que les moyens de freinage de la génératrice sont actionnés dès que le fonctionnement des moyens d'indication horaire n'est plus sensiblement synchrone avec ladite base de temps et en ce que les moyens aimantés sont agencés de manière à ce que ledit couple de positionnement statique CP soit supérieur ou sensiblement égal à un couple de référence CREF pour lequel le couple CB exercé par le barillet sur le rotor est égal audit couple minimum de synchronisation CSYNC.
- Pièce d'horlogerie selon la revendication 1, caractérisée en ce qu'il comprend en outre des moyens de réglage (19, 20) du couple de positionnement statique CP entre l'aimant (18) et le rotor (2) permettant de régler ce couple CP pour qu'il soit sensiblement égal audit couple de référence CREF.
- Pièce d'horlogerie selon la revendication 2, caractérisée en ce que ledit couple de référence CREF est choisi avec un facteur de sécurité fS tenant compte de la dégradation du système.
- Pièce d'horlogerie selon la revendication 2 ou 3, caractérisée en ce que ledit couple CP est supérieur à la somme entre ledit couple de référence CREF et celui exercé par un utilisateur pour remonter ladite pièce.
- Pièce d'horlogerie selon la revendication 2, 3 ou 4, caractérisée en ce que lesdits moyens aimantés (18) sont mobiles (20) en rotation et/ou en translation.
- Pièce d'horlogerie selon la revendication 5, caractérisée en ce que lesdits moyens aimantés (18) sont fixés après que ledit couple de positionnement CP a été réglé.
- Pièce d'horlogerie selon la revendication 5 ou 6, caractérisée en ce que lesdits moyens aimantés (18) présentent un moyen de repère (19) du sens d'aimantation.
- Pièce d'horlogerie selon la revendication 7, caractérisée en ce que ledit moyen de repère (19) du sens d'aimantation est une rainure de vis.
- Procédé de réglage du démarrage d'une pièce d'horlogerie selon l'une des revendications précédentes, caractérisé en ce que ledit couple de positionnement statique CP est réglé lors du montage de la pièce d'horlogerie selon les étapes suivantes :installer les moyens aimantés (18) à proximité du rotor (2) ;positionner les moyens aimantés de façon à ce que le couple de positionnement statique CP avec le rotor soit supérieur audit couple de référence CREF pour lequel le couple CB exercé par le barillet (5) sur le rotor est égal audit couple minimum de synchronisation CSYNC;pré-armer le barillet pour que son couple CB soit supérieur ou sensiblement égal audit couple de référence CREF;déplacer en rotation et/ou en translation les moyens aimantés jusqu'à ce que la génératrice (1) se mette en marche.
- Procédé de réglage selon la revendication 9, caractérisé en ce que lesdits moyens aimantés (18) sont sélectionnés toutes tolérances défavorables incluses.
- Procédé de réglage selon la revendication 9 ou 10, caractérisé en ce que le positionnement initial desdits moyens aimantés est réalisé de manière à ce que le couple de positionnement statique CP avec le rotor soit maximal.
- Procédé de réglage selon la revendication 9, 10 ou 11, caractérisé en ce que ledit couple de référence CREF est pris avec un facteur de sécurité fS tenant compte de la dégradation du système.
- Procédé de réglage selon l'une des revendications 9 à 12 caractérisé en ce que ledit couple CP est réglé pour être supérieur à la somme entre ledit couple de référence CREF et celui exercé par un utilisateur pour remonter la pièce d'horlogerie.
- Procédé de réglage selon l'une des revendications 9 à 13, caractérisé en ce qu'il comprend une étape supplémentaire constituant à fixer les moyens aimantés une fois le réglage du couple de positionnement statique CP effectué.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP01201061A EP1243986B1 (fr) | 2001-03-20 | 2001-03-20 | Pièce d'horlogerie comportant une génératrice |
| DE60140294T DE60140294D1 (de) | 2001-03-20 | 2001-03-20 | Uhrwerk mit Spannungsgenerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP01201061A EP1243986B1 (fr) | 2001-03-20 | 2001-03-20 | Pièce d'horlogerie comportant une génératrice |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1243986A1 true EP1243986A1 (fr) | 2002-09-25 |
| EP1243986B1 EP1243986B1 (fr) | 2009-10-28 |
Family
ID=8180043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01201061A Expired - Lifetime EP1243986B1 (fr) | 2001-03-20 | 2001-03-20 | Pièce d'horlogerie comportant une génératrice |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1243986B1 (fr) |
| DE (1) | DE60140294D1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3838424A1 (fr) * | 2019-12-20 | 2021-06-23 | The Swatch Group Research and Development Ltd | Mécanisme musical ou de sonnerie comprenant un système à génératrice électrique |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5668414A (en) * | 1994-07-04 | 1997-09-16 | Seiko Epson Corporation | Spring driven electricity generator with a control circuit to regulate the release of energy in the spring |
| EP0822470A1 (fr) * | 1996-08-01 | 1998-02-04 | Asulab S.A. | Pièce d'horlogerie électronique comportant une génératrice entrainée par un barillet à ressort |
-
2001
- 2001-03-20 EP EP01201061A patent/EP1243986B1/fr not_active Expired - Lifetime
- 2001-03-20 DE DE60140294T patent/DE60140294D1/de not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5668414A (en) * | 1994-07-04 | 1997-09-16 | Seiko Epson Corporation | Spring driven electricity generator with a control circuit to regulate the release of energy in the spring |
| EP0822470A1 (fr) * | 1996-08-01 | 1998-02-04 | Asulab S.A. | Pièce d'horlogerie électronique comportant une génératrice entrainée par un barillet à ressort |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3838424A1 (fr) * | 2019-12-20 | 2021-06-23 | The Swatch Group Research and Development Ltd | Mécanisme musical ou de sonnerie comprenant un système à génératrice électrique |
| US12242229B2 (en) | 2019-12-20 | 2025-03-04 | The Swatch Group Research And Development Ltd | Musical or striking mechanism comprising an electric generator system |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1243986B1 (fr) | 2009-10-28 |
| DE60140294D1 (de) | 2009-12-10 |
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