EP1868045B1 - Spiralrolle für Uhr - Google Patents
Spiralrolle für Uhr Download PDFInfo
- Publication number
- EP1868045B1 EP1868045B1 EP06012021.9A EP06012021A EP1868045B1 EP 1868045 B1 EP1868045 B1 EP 1868045B1 EP 06012021 A EP06012021 A EP 06012021A EP 1868045 B1 EP1868045 B1 EP 1868045B1
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- EP
- European Patent Office
- Prior art keywords
- collet
- balance spring
- shaft
- joining
- zone
- 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
- 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
- G04B17/345—Details of the spiral roll
Definitions
- the present invention relates to a timepiece ferrule, more specifically a spiral-ferrule assembly, the ferrule for fixing the inner end of the spiral to the axis of a pendulum.
- a disadvantage of certain conventional ferrules, particularly elastic ferrules, is that the distance between the junction point of the spiral to the ferrule and the center of the balance shaft is modified during the driving of the ferrule on the balance shaft, which offsets the hairspring and thus damages the isochronism of the sprung balance.
- the present invention aims to propose another solution to maintain the distance between the junction point of the spiral to the ferrule and the center of the balance shaft substantially constant during driving, in particular a solution that does not require or provide a frame externally, or to give the whole shell a particular form.
- a ferrule 1 for fixing the inner end of a spiral 2 to the axis 6 of a pendulum in a clockwork movement, comprises three elastic arms 3 arranged in a triangle.
- the elastic arms 3 define an equilateral triangular central opening 4 whose diameter of the inscribed circle is slightly smaller than the diameter of a cylindrical or slightly frustoconical bearing surface 5 of the balance shaft 6, so that the axis 6 can be driven into the ferrule 1, which deformation elastically deforms the arms 3 towards the outside of the shell 1.
- the inner end of the spiral 2 is attached to the shell 1 at a point 8 of one, 7a, of the three zones 7a, 7b , 7c junction between 3.
- the ferrule 1 When the ferrule 1 is driven on the axis 6, this inner end of the spiral is secured to the axis 6 and therefore follows the oscillating movements of the balance.
- the outer end of the hairspring 2, not shown, is fixed by a peg to a fixed part of the watch movement, typically the rooster, in a known manner.
- the triangular shape of the opening 4 allows precise contact between the axis 6 and the shell 1, in three discrete contact points 9.
- the width of the elastic arms 3 is preferably variable to make the distribution of the stresses exerted by the axis 6 more homogeneous and thus make it possible to increase the clamping force of the axis 6 and / or the deformation of the elastic arms 3, in the manner of the elastic arms of the ferrule according to the document EP 1 637 940 . More specifically, the width of each arm has maxima L0, L1, L2 where forces are applied, that is to say at the point 9 of contact with the axis 6 and at both ends of the arm 3, and minima L3, L4 where the stresses are lowest, that is to say at points located between the point of contact 9 and the two ends of the arm 3.
- the zone 7a of junction of the arms 3 to which is connected the spiral 2 is specially shaped so that the distance R between the point 8 of junction between the spiral 2 and the shell 1 and the center O (in the plane of the ferrule 1) of the axis 6 is not substantially modified by the driving of the shell 1 on the axis 6. It can be seen on the figure 1 that the zone 7a does not have the same shape as the other junction zones 7b, 7c. Zone 7a has indeed, unlike zones 7b, 7c, lateral recesses 10.
- figure 2 represents by small arrows the direction of the local deformations undergone by a shell 1 'identical to the ferrule 1 but not including the recesses 10, under the effect of radial forces F exerted by the axis 6 at the contact points 9.
- the zone 7a of junction between the arms 3, like the other two junction zones 7b, 7c, comprises a part of lesser deformation or "node" 11, that is to say a part which does not deform or little and which in any case deforms less than the rest of the zone 7a.
- the node 11 is located in the central angular portion of the angular sector 12 of vertex center O of the axis 6 and in which is inscribed the zone 7a.
- the node 11 is closer to the inner contour of the ferrule 1 '.
- the local deformations tend to bypass this node 11 and to distance the material , in particular the junction point 8 between the spiral 2 and the ferrule 1 ', of the center O.
- the present invention proposes to remove from the junction zone 7a, during the design of the shell, parts of which the deformation significantly contributes to the distance of the junction point 8.
- it removes left and right side portions 14 located in the immediate vicinity of the node 11 and farther from the center O than the node 11.
- the two resulting recesses define an intermediate portion 15 between the junction point 8 and the node 11.
- This intermediate portion 15 is narrower (in the direction orthogonal to the radial axis 13) than the rest of the junction zone 7a and in particular that the inner portion 19 of the zone 7a including the node 11.
- This intermediate portion 15 is further located in the central angular portion of the angular sector 12 in which is inscribed the junction zone 7a, as the node 11.
- the recesses 10 prevent the deformations of the two parts 16 of the junction zone 7a located on the right and to the left of the node 11 and substantially at the same distance from the center O as the node 11, deformations which tend to bypass the node 11, are transmitted to the intermediate portion 15 and the junction point 8.
- the intermediate portion 15 is deformed therefore very little during the driving of the axis 6 in the shell 1, so that the point of junction 8 moves very little.
- a change in the distance R between the point 8 and the center O much lower than the generally accepted maximum value, 5 microns, can thus be obtained.
- a modification of the distance R less than 0.1 ⁇ m can even be obtained, as shown in FIG. figure 4 where the gray parts correspond to deformation after driving greater than 0.1 microns and the white parts correspond to strains after driving less than 0.1 microns.
- the deformations less than 0.1 ⁇ m relate to the spiral 2, the intermediate portion 15, the node 11 of the junction zone 7a and the nodes 17 of the other two junction zones between the arms 3.
- the very slight change in the distance R mentioned above can be obtained without weakening to a great extent the junction zone 7a.
- the intermediate portion 15 of the junction zone 7a defined by the recesses 10, although narrower than the rest of the junction zone 7a, can indeed maintain a sufficient width, greater than that of the turns of the spiral 2, to avoid to deform during the operation of the spiral 2 (pendulum oscillations).
- the width of the intermediate portion 15 is typically equal to about three times the width of the turns of the hairspring 2.
- the recesses made in the junction zone 7a to keep the distance R substantially constant during the driving process do not necessarily have the shape of the recesses illustrated in FIGS. figures 1 , 3 and 4 .
- the figure 5 shows another embodiment of the ferrule 1 according to the invention, wherein the recesses are notches 18 made transversely to the radial axis 13 on each side of the junction zone 7a near the node 11. These notches 18 define an intermediate portion 15 between the junction point 8 and the node 11, intermediate portion 15 which is narrower than the inner portion 19 of the zone 7a including the node 11 and an outer portion 21 of the zone 7a including the point of junction 8.
- the ferrule according to the invention and its method of realization have the advantage in particular of not requiring that the entire shape of the ferrule be designed in order to maintain substantially constant the distance between the junction point of the spiral to the ferrule and the center of the axis.
- the arms 3 of the shell may have a particular shape, variable width, to increase the clamping force of the axis 6 and / or the deformation of the arms 3 by distributing more homogeneously the stresses inside the arms 3.
- the ferrule further comprises abutments formed by discrete portions 20a, 20b and 20c of the outer contour of the shell, at the junction areas 7a, 7b, 7c respectively.
- These stops 20a, 20b, 20c are located at respective distances Ra, Rb, Rc of the center O which are small enough not to interfere with the normal operation of the hairspring 2 but large enough, in the event of shock suffered by the movement, to allow the inner turn of the hairspring 2 to abut against one or more stops 20a, 20b and 20c before the elastic limit of this inner turn, including at the junction point 8, is exceeded. The risks of rupture of the balance spring 3 during an impact are thus reduced.
- the abutments 20a, 20b and 20c typically have an arcuate shape of center O and radii Ra, Rb and Rc respectively.
- these distances or radii Ra, Rb and Rc grow in the direction D of winding of the spiral 2 going from the inside to the outside from the point 8 of junction of the spiral 2 to the shell 1, this to take into account in that the radius of the inner turn of the spiral 2, like that of all the other turns, increases in this direction D.
- the stop 20b closest to the junction point 8 in the direction D is at a distance Rb from center O which is smaller than the distance Rc separating the next stop 20c from the center O, which is smaller than the distance Ra separating the next stop 20a from the center O.
- the distance R8 separating the point 8 of junction between the hairspring 2 and the ferrule 1 of the center O is it typically greater than or equal to the distance Rb and less than the distances Rc and Ra.
- Another advantage of the present invention is that it does not require a stiffening frame surrounding the deformable portion of the ferrule.
- the principle of the present invention can be applied to other ferrule shapes than the triangular shape shown in FIGS. figures 1 and 5 , for example to other polygonal shapes, regular or not, or even non-polygonal shapes.
- the ferrule according to the invention could thus, in a variant, have the conventional general shape of a split annular ring, with the junction point of the spiral to the ferrule located opposite the slot.
- the ferrule could be considered as comprising two deformable arms whose junction zone comprises the junction point of the spiral to the ferrule.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Springs (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Claims (18)
- Spiralfeder-Spiralrolle-Uhranordnung, umfassend eine Spiralfeder (2) und eine Spiralrolle (1), wobei die Spiralfeder (2) an ihrem inneren Ende an der Spiralrolle (1) an einer Verbindungsstelle (8) befestigt ist, wobei die Spiralrolle (1) ohne äußeren Versteifungsrahmen ist, wobei die Spiralrolle (1) mindestens zwei verformbare Arme (3), zwischen denen eine Achse (6) mit kreisförmigem Querschnitt eingepresst sein kann, und in dem Bereich (7a) der Verbindungsstelle (8), die einen Verbindungsbereich zwischen den zwei Armen (3) bildet, mindestens eine Ausnehmung (10; 18) aufweist, die ausgebildet ist, damit die Änderung des Abstands (R) zwischen der Verbindungsstelle (8) und der Mitte (0) der Achse (6) während des Einpressens der Spiralrolle (1) auf die Achse (6) kleiner als 0,1 µm ist, wobei die Ausnehmung oder die Ausnehmungen (10; 18) nahe eines Teils mit geringerer Verformung (11) des Verbindungsbereichs (7a) ist oder sind, das heißt eines Teils (11), der sich während des Einpressens der Spiralrolle (1) auf die Achse (6) weniger als der Rest des Verbindungsbereichs (7a) verformt, und in dem Verbindungsbereich (7a) ein Zwischenteil (15) zwischen der Verbindungsstelle (8) und dem Teil mit geringerer Verformung (11) definiert oder definieren, wobei dieser Zwischenteil (15) weniger breit als ein innerer Teil (19) relativ zu der Mitte (0) des Verbindungsbereichs (7a) ist, wobei dieser innere Teil (19) den Teil mit geringerer Verformung (11) umfasst, wobei jeder verformbare Arm (3) angeordnet ist, um in Punktkontakt mit der Achse (6) zu sein und eine variable Breite (L0 - L4) aufweist, die Maxima (L0, L1, L2) im Wesentlichen an der Kontaktstelle (9) mit der Achse (6) und an den zwei Enden des Arms (3), die mit einem oder mehreren anderen Armen (3) der Spiralrolle verbunden sind, und Minima (L3, L4) zwischen der Kontaktstelle (9) und den zwei Enden des Arms (3) aufweist, um die Verteilung der Spannungen, die von der Achse (6) auf diesen Arm ausgeübt werden, homogener zu machen.
- Spiralfeder-Spiralrolle-Anordnung nach Anspruch 1, dadurch gekennzeichnet, dass die Ausnehmung oder die Ausnehmungen (10; 18) dem Verbindungsbereich (7a) eine Form verleiht oder verleihen, die von jener von einem oder mehreren anderen Verbindungsbereichen (7b, 7c) zwischen den Armen (3) verschieden ist.
- Spiralfeder-Spiralrolle-Anordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Ausnehmung oder die Ausnehmungen (10; 18) eine erste und eine zweite Ausnehmung aufweisen, die auf beiden Seiten des Zwischenteils (15) angeordnet sind.
- Spiralfeder-Spiralrolle-Anordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Spiralrolle (1) mindestens drei verformbare Arme (3) aufweist, die in einem Polygon angeordnet sind.
- Spiralfeder-Spiralrolle-Anordnung nach Anspruch 4, dadurch gekennzeichnet, dass das Polygon ein regelmäßiges Polygon ist.
- Spiralfeder-Spiralrolle-Anordnung nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die Spiralrolle (1) drei verformbare Arme (3) aufweist, die in einem Dreieck angeordnet sind.
- Spiralfeder-Spiralrolle-Anordnung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die verformbaren Arme (3) elastisch sind.
- Spiralfeder-Spiralrolle-Anordnung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Ausnehmung oder die Ausnehmungen eine oder mehrere Kerben (18) aufweist.
- Spiralfeder-Spiralrolle-Anordnung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Außenkontur der Spiralrolle (1) mindestens einen Anschlag (20a, 20b, 20c) definiert, gegen den die innere Windung der Spiralfeder (2) bei einem Stoß in Anlage kommen kann, bevor die Streckgrenze der inneren Windung überschritten wird.
- Spiralfeder-Spiralrolle-Anordnung nach Anspruch 9, dadurch gekennzeichnet, dass der mindestens ein Anschlag aus mehreren diskreten Anschlägen (20a, 20b, 20c) besteht, die in jeweiligen Abständen (Ra, Rb, Rc) von der Mitte (0) der Achse (6) angeordnet sind, die in die Richtung (D) von der Spiralfeder (2) zunehmend sind, die vom Inneren zum Äußeren von der Verbindungsstelle (8) der Spiralfeder (2) zu der Spiralrolle (1) verläuft.
- Spiralfeder-Spiralrolle-Anordnung nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass sie einstückig ausgebildet ist.
- Spiralfeder-Spiralrolle-Anordnung nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass sie aus einem Material auf Siliziumbasis besteht.
- Verfahren zur Herstellung einer Uhr-Spiralrolle (1), die dazu bestimmt ist, auf einer Achse (6) eingepresst zu werden, um das innere Ende einer Spiralfeder (2) an dieser Achse (6) zu befestigen, dadurch gekennzeichnet, dass es die folgenden Schritte aufweist:a) Entwerfen einer Spiralrolle (1'), der eine Verbindungsstelle (8) mit der Spiralfeder (2) aufweist, wobei die Form dieser Spiralrolle nach Kriterien ausgewählt wird, die von der Frage der Änderung des Abstands (R) zwischen der Verbindungsstelle (8) und der Mitte (0) der Achse (6) bei dem Einpressen der Spiralrolle auf die Achse (6) unabhängig sind,b) Berechnen der örtlichen Verformungen, die die Spiralrolle (1') in dem Bereich (7a) der Verbindungsstelle (8) beim Einpressen der Spiralrolle auf die Achse (6) erfahren hat,c) Ändern des Entwurfs der Spiralrolle (1'), indem von dem Bereich (7a) mindestens ein Teil (14) entfernt wird, dessen Verformungen dazu beitragen, den Abstand (R) zwischen der Verbindungsstelle (8) und der Mitte (0) der Achse (6) bei dem Einpressen der Spiralrolle auf die Achse (6) zu ändern, undd) Herstellen der Spiralrolle.
- Verfahren nach Anspruch 13, dadurch gekennzeichnet, dass der Schritt a) darin besteht, eine Spiralrolle (1') zu entwerfen, der mindestens zwei verformbare Arme (3), zwischen denen die Achse (6) eingepresst werden kann, und einen Verbindungsbereich (7a) zwischen diesen zwei Armen (3) aufweist, wobei der Verbindungsbereich (7a) den Bereich der Verbindungsstelle (8) bildet.
- Verfahren nach Anspruch 14, dadurch gekennzeichnet, dass der Schritt c) darin besteht, von dem Verbindungsbereich (7a) mindestens einen Teil (14) zu entfernen, der in der Nähe eines Teils mit geringerer Verformung (11) des Bereichs (7a) angeordnet ist.
- Verfahren nach Anspruch 15, dadurch gekennzeichnet, dass der mindestens eine Teil (14) einen ersten und einen zweiten Teil aufweist, die auf jeder Seite des Verbindungsbereichs (7a) angeordnet sind.
- Verfahren nach einem der Ansprüche 14 bis 16, dadurch gekennzeichnet, dass der Schritt a) darin besteht, eine Spiralrolle zu entwerfen, der mindestens drei verformbare Arme (3) aufweist, die in einem Polygon angeordnet sind.
- Verfahren nach Anspruch 17, dadurch gekennzeichnet, dass das Polygon regelmäßig ist.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06012021.9A EP1868045B1 (de) | 2006-06-12 | 2006-06-12 | Spiralrolle für Uhr |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06012021.9A EP1868045B1 (de) | 2006-06-12 | 2006-06-12 | Spiralrolle für Uhr |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1868045A1 EP1868045A1 (de) | 2007-12-19 |
EP1868045B1 true EP1868045B1 (de) | 2019-02-20 |
Family
ID=37857109
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06012021.9A Active EP1868045B1 (de) | 2006-06-12 | 2006-06-12 | Spiralrolle für Uhr |
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EP (1) | EP1868045B1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH707288B1 (fr) * | 2012-11-22 | 2017-07-31 | Mft Et Fabrique De Montres Et De Chronomètres Ulysse Nardin Le Locle S A | Dispositif de maintien élastique de deux pièces. |
HK1186057A2 (en) * | 2013-01-14 | 2014-03-07 | Master Dynamic Ltd | Stress-relief elastic structure of hairspring collet |
EP2916177B1 (de) | 2014-03-05 | 2018-11-07 | Nivarox-FAR S.A. | Spirale, die mit einer Federscheibe gesichert werden muss |
EP3309625B1 (de) * | 2016-10-13 | 2020-07-29 | Nivarox-FAR S.A. | Spirale zur befestigung mit einer federscheibe |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1857891A1 (de) * | 2006-05-17 | 2007-11-21 | Patek Philippe Sa | Spiralfeder-Spiralrollegesamtheit für ein Uhrwerk |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH500523A (fr) * | 1969-06-05 | 1970-08-31 | William Berthoud Louis | Ensemble comprenant une virole et un spiral d'horlogerie |
EP1302821A3 (de) * | 2001-10-10 | 2010-05-05 | Franck Muller-Watchland SA | Spiralfeder für Zeitmessgerät |
EP1445670A1 (de) * | 2003-02-06 | 2004-08-11 | ETA SA Manufacture Horlogère Suisse | Spiralfeder der Resonatorunruh und Fabrikationsmethode |
ATE421720T1 (de) * | 2004-04-06 | 2009-02-15 | Nivarox Sa | Spiralrolle ohne deformation des fixierungsradius der spiralfeder und herstellungsverfahren derartige spiralrolle |
ATE517374T1 (de) * | 2004-08-31 | 2011-08-15 | Patek Philippe Sa Geneve | Spiralrolle für uhren |
-
2006
- 2006-06-12 EP EP06012021.9A patent/EP1868045B1/de active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1857891A1 (de) * | 2006-05-17 | 2007-11-21 | Patek Philippe Sa | Spiralfeder-Spiralrollegesamtheit für ein Uhrwerk |
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EP1868045A1 (de) | 2007-12-19 |
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