EP2753985A1 - Mouvement d'horlogerie à balancier-spiral - Google Patents
Mouvement d'horlogerie à balancier-spiralInfo
- Publication number
- EP2753985A1 EP2753985A1 EP12778381.9A EP12778381A EP2753985A1 EP 2753985 A1 EP2753985 A1 EP 2753985A1 EP 12778381 A EP12778381 A EP 12778381A EP 2753985 A1 EP2753985 A1 EP 2753985A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stiffened portion
- spiral
- amplitude
- stiffened
- hairspring
- 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
- 230000010355 oscillation Effects 0.000 claims abstract description 20
- 238000011161 development Methods 0.000 claims description 15
- 230000005021 gait Effects 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 description 8
- 230000007423 decrease Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241000287828 Gallus gallus Species 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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
- G04B17/066—Manufacture of the spiral spring
-
- 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
- G04B17/20—Compensation of mechanisms for stabilising frequency
- G04B17/26—Compensation of mechanisms for stabilising frequency for the effect of variations of the impulses
Definitions
- the present invention relates to a clockwork movement, more particularly to a movement comprising a sprung balance type regulator and an escapement.
- the present invention aims to further improve the isochronism of a sprung balance regulator and proposes for this purpose a watch movement
- CONFIRMATION C0PY comprising a sprung-balance regulator and an escapement cooperating with the regulator, the outer coil of the spiral comprising a stiffened portion arranged to make the development of the spiral more concentric, characterized in that the stiffened portion is also arranged to compensate at least partially the variation the movement of the movement according to the oscillation amplitude of the balance due to the exhaust.
- the stiffened portion is arranged to produce a gait of at least 2 s / d, or at least 4 s / d, or at least 6 s / d, or at least 8 s / j, at an amplitude of 150 ° with respect to an amplitude of 300 °, at least partially compensating for said variation in operation due to the exhaust.
- the stiffened portion is closer to the outer end of the hairspring that a theoretical stiffened portion that would make the development of the hairspring substantially perfectly concentric, the thickness and the extent of the stiffened portion can be substantially identical to those of said theoretical stiffened portion.
- the stiffened portion is less thick than a theoretical stiffened portion that would make the development of the spiral substantially perfectly concentric, the position and the extent of the stiffened portion being substantially identical to those of said theoretical stiffened portion .
- the stiffened portion is less extensive than a theoretical stiffened portion that would make the development of the hairspring substantially perfectly concentric, the position and the thickness of the stiffened portion being substantially identical to those of said theoretical stiffened portion.
- FIG. 1 shows a spiral stiffened outer turn portion of the prior art, a ferrule associated with the spiral being shown schematically by a dotted line;
- FIG. 2 shows an isochronism curve obtained by numerical simulation of the displacements of the geometric center of the spiral illustrated in FIG. 1, the regulator or oscillator of which this spiral is part being considered as free, that is to say not subject to the action of an exhaust;
- FIG. 3 shows global isochronism measurement results obtained on a real movement comprising a spiral as shown in FIG. 1;
- FIG. 4 shows a hairspring with a stiffened outer turn portion according to a first embodiment of the invention
- FIG. 5 shows an isochronism curve obtained by numerical simulation of the displacements of the geometric center of the spiral illustrated in FIG. 4, the regulator or oscillator of which this spiral is part being considered as free, that is to say not subject to the action of an exhaust;
- FIG. 6 shows global isochronism measurement results obtained on a real movement comprising a spiral as shown in FIG. 4;
- FIG. 7 shows a hairspring with a stiffened outer turn portion according to a second embodiment of the invention
- FIG. 8 shows an isochronism curve obtained by numerical simulation of the displacements of the geometric center of the spiral illustrated in FIG. 7, the regulator or oscillator of which this spiral is part being considered as free, that is to say not subject to the action of an exhaust;
- FIG. 9 shows a spiral with a stiffened outer turn portion according to a third embodiment of the invention.
- FIG. 10 shows an isochronism curve obtained by numerical simulation of the displacements of the geometric center of the spiral illustrated in FIG. 9, the regulator or oscillator of which this spiral is part being considered as free, that is to say not subject to the action of an exhaust.
- FIG. 1 shows a planar hairspring of the type described in patent EP 1473604, for a balance-sprung regulator of a watch movement.
- This spiral indicated by the reference numeral 1, is in the form of an Archimedean spiral and is fixed by its inner end 2 to a ferrule 3 mounted on the balance shaft and by its outer end 4 to a stud (not shown) mounted on a fixed piece of movement such as the rooster.
- the spiral assembly 1 - ferrule 3 can be made in one piece, in a crystalline material such as silicon or diamond, by a micro-etching technique.
- the outer coil 5 of the spiral 1 locally comprises a portion 6 of greater thickness e than the rest of the blade forming the spiral.
- This thickness e which can be variable along the portion 6 as shown, stiffens the portion 6 and thus makes it substantially inactive during the development of the hairspring.
- the position and the extent of the stiffened portion 6 are chosen so that the center of deformation of the spiral, substantially corresponding to the center of gravity of the portion of the spiral other than the stiffened portion 6, is substantially coincidental with the geometric center O of the spiral , which coincides with the center of rotation of the shell 3. In this way, the development of the spiral is concentric or almost concentric.
- the stiffened portion 6 ends before the outer end 4 of the hairspring.
- This outer end 4, more precisely an end portion 7 of the outer turn 5 including the stiffened portion 6, is spaced radially outwardly relative to the pattern of the spiral of Archimedes to ensure that the last but one turn 8 remains free radially, that is to say does not touch any element such as the peak, the outer turn or racket pin, during the operation of the movement.
- the gap between the end portion 7 and the penultimate turn 8 must be greater than that of a traditional hairspring, because due to the concentric development of the hairspring, the penultimate turn 8 moves radially further towards the peak when expanding the hairspring.
- the end portion 7 is in the form of a circular arc of center C.
- the angular extent ⁇ of the stiffened portion 6 and its angular position a are defined from this center C.
- the thickness e is measured along a radius starting from this center C. In the example shown, the values ⁇ and a are respectively equal to 85 , 9 ° and 72 ° and the maximum of the thickness e is equal to 88.7 ⁇ m.
- the thickness eo of the blade forming the hairspring is equal to 32.2 ⁇ m.
- FIG. 2 is an isochronism diagram obtained with the spiral illustrated in FIG. 1 by numerical simulation. More precisely, the diagram of FIG. 2 is obtained by considering the fixed outer end 4 and the shaft on which are fixed the shell 3 and the free balance (that is to say not mounted in bearings), in finite element computation of the displacement of the geometric center O of the spiral during oscillations of the balance, then interpolating and integrating the displacement curve as a function of the amplitude of oscillation. On the abscissa of the diagram is carried the oscillation amplitude of the pendulum expressed in degrees relative to the position of equilibrium and the ordinate is carried the step in seconds per day.
- the gap between a 150 ° oscillation amplitude and an amplitude of oscillation of 300 ° is of the order of 1 s / d, which is excellent.
- this diagram does not take into account the disturbances due to the exhaust.
- the step decreases progressively as the amplitude of oscillation decreases.
- a curve was interpolated and the gapping difference between the oscillation amplitude of 150 ° and the amplitude of oscillation of 300 ° was determined.
- the average of the deviations on all the positions and all the movements was about 6.7 s / d between said amplitudes.
- walking at 150 ° was on average less than about 6.7 s / d when walking at 300 °. This decrease in gait, or delay at small amplitudes compared to large amplitudes, is essentially due to the escapement.
- the present inventor has (have) observed that the decrease in the gait due to the exhaust could, at least in part, be compensated by modifying the arrangement of the stiffened portion 6, namely for example, its position a and / or its extent ⁇ and / or its thickness e, with respect to the arrangement of FIG. 1, which gives the turns of the spiral a perfect or almost perfect concentricity.
- a parameter of the stiffened portion 6 having a particular influence on isochronism is its position a.
- FIG. 4 shows the new spiral obtained, with its stiffened outer turn portion denoted by the reference numeral 6 '. The displacement of the stiffened portion 6 of course changes the development of the spiral, which is not so concentric.
- this modification is weak, the spiral developing even more concentrically than a traditional spiral (that is to say a spiral without stiffened portion), and, on the other hand, this modification helps to improve the overall isochronism of the movement.
- the isochronism curve 14 of the spiral illustrated in FIG. 4 obtained according to the same method as in FIG. 2. It is seen that the increase in the gait between the amplitude of 300 ° and the amplitude of 150 ° is substantially linear and of inverse slope of the slope of the variation of the step due to the escape. This is also shown in FIG. 5 the isochronism curve 11 of the spiral illustrated in FIG. 1 for comparison.
- FIG. 5 the isochronism curve 14 of the spiral illustrated in FIG. 4 for comparison.
- FIG. 6 shows results of measuring the movement of a movement identical to that on which the measurements of FIG. 3 have been made, but equipped with the spiral illustrated in FIG. 4 instead of that of FIG. 1. These results show that the variation of the gait has been significantly reduced by the displacement of the stiffened portion at the ⁇ 'position, in particular in the range of amplitudes ranging from 180 ° to 300 ° where the general appearance of the graph is flat. .
- Another parameter of the stiffened portion 6 having an influence on isochronism is its thickness e. By decreasing the thickness e, a small amplitude advance is created with respect to the large oscillation amplitudes of the balance.
- FIG. 7 shows the hairspring obtained, with its stiffened outer turn portion designated by the reference numeral 6 ", and FIG. 8 shows the isochronism curve 17 corresponding to such a hairspring.
- Yet another parameter of the stiffened portion having an influence on isochronism is its extent ⁇ .
- ⁇ By decreasing the span ⁇ , a small amplitude advance is created with respect to the large oscillation amplitudes of the balance.
- FIG. 9 shows the hairspring obtained, with its stiffened outer turn portion denoted by the reference numeral 6 "'
- FIG. 10 shows the isochronism curve 19 corresponding to such a hairspring.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Springs (AREA)
- Micromachines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH01473/11A CH705471B1 (fr) | 2011-09-07 | 2011-09-07 | Mouvement d'horlogerie à balancier-spiral. |
PCT/IB2012/001700 WO2013034962A1 (fr) | 2011-09-07 | 2012-09-04 | Mouvement d'horlogerie à balancier-spiral |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2753985A1 true EP2753985A1 (fr) | 2014-07-16 |
EP2753985B1 EP2753985B1 (fr) | 2017-03-01 |
Family
ID=47076263
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12778381.9A Active EP2753985B1 (fr) | 2011-09-07 | 2012-09-04 | Mouvement d'horlogerie à balancier-spiral |
Country Status (5)
Country | Link |
---|---|
US (1) | US9134701B2 (fr) |
EP (1) | EP2753985B1 (fr) |
JP (1) | JP6042891B2 (fr) |
CH (1) | CH705471B1 (fr) |
WO (1) | WO2013034962A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH708429A1 (fr) | 2013-08-19 | 2015-02-27 | Manuf Et Fabrique De Montres Et Chronomètres Ulysse Nardin Le Locle S A | Spiral pour organe réglant de montre mécanique, organe régulateur muni d'un tel spiral, et procédé de réalisation d'un tel spiral. |
WO2016192957A1 (fr) * | 2015-06-03 | 2016-12-08 | Eta Sa Manufacture Horlogère Suisse | Résonateur à réglage fin par raquetterie |
KR102305812B1 (ko) * | 2016-03-23 | 2021-09-29 | 파텍 필리페 에스아 쥬네브 | 시계를 위한 평형 바퀴 오실레이터 |
EP3913441B1 (fr) | 2020-05-22 | 2024-05-01 | Patek Philippe SA Genève | Oscillateur pour pièce d'horlogerie |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1445670A1 (fr) * | 2003-02-06 | 2004-08-11 | ETA SA Manufacture Horlogère Suisse | Spiral de résonateur balancier-spiral et son procédé de fabrication |
EP2224293B1 (fr) | 2003-04-29 | 2012-07-18 | Patek Philippe SA Genève | Organe de régulation à balancier et à spiral plan pour mouvement d'horlogerie |
WO2006123095A2 (fr) * | 2005-05-14 | 2006-11-23 | Gideon Levingston | Spiral, ensemble balancier regule et procedes de fabrication |
EP2151722B8 (fr) * | 2008-07-29 | 2021-03-31 | Rolex Sa | Spiral pour résonateur balancier-spiral |
CH701846B8 (fr) * | 2009-09-21 | 2015-06-15 | Rolex Sa | Spiral plat pour balancier d'horlogerie et ensemble balancier-spiral. |
DE102009048733A1 (de) * | 2009-10-08 | 2011-04-14 | Konrad Damasko | Spiralfeder für mechanische Schwingungssysteme von Uhren |
-
2011
- 2011-09-07 CH CH01473/11A patent/CH705471B1/fr unknown
-
2012
- 2012-09-04 WO PCT/IB2012/001700 patent/WO2013034962A1/fr active Application Filing
- 2012-09-04 EP EP12778381.9A patent/EP2753985B1/fr active Active
- 2012-09-04 US US14/238,536 patent/US9134701B2/en active Active
- 2012-09-04 JP JP2014529079A patent/JP6042891B2/ja active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2013034962A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2014525591A (ja) | 2014-09-29 |
US9134701B2 (en) | 2015-09-15 |
US20140192627A1 (en) | 2014-07-10 |
CH705471B1 (fr) | 2016-03-31 |
JP6042891B2 (ja) | 2016-12-14 |
WO2013034962A1 (fr) | 2013-03-14 |
EP2753985B1 (fr) | 2017-03-01 |
CH705471A2 (fr) | 2013-03-15 |
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