EP2017681A1 - Breguet-Spiralfeder für Uhr und Verfahren zu deren Herstellung - Google Patents

Breguet-Spiralfeder für Uhr und Verfahren zu deren Herstellung Download PDF

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Publication number
EP2017681A1
EP2017681A1 EP07014128A EP07014128A EP2017681A1 EP 2017681 A1 EP2017681 A1 EP 2017681A1 EP 07014128 A EP07014128 A EP 07014128A EP 07014128 A EP07014128 A EP 07014128A EP 2017681 A1 EP2017681 A1 EP 2017681A1
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EP
European Patent Office
Prior art keywords
spiral
curve
center
bend
rotation
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.)
Withdrawn
Application number
EP07014128A
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English (en)
French (fr)
Inventor
Michel Belot
Franck Orny
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.)
GRIFFES CONSULTING SA
Original Assignee
Noriah SA
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 Noriah SA filed Critical Noriah SA
Priority to EP07014128A priority Critical patent/EP2017681A1/de
Publication of EP2017681A1 publication Critical patent/EP2017681A1/de
Withdrawn legal-status Critical Current

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    • 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

Definitions

  • the present invention relates to a horological spiral, that is to say a spiral-shaped spring intended to be mounted on the same axis as a balance to form with the latter the regulating member of a movement of watchmaking.
  • the present invention relates more particularly to a Breguet spiral type.
  • Breguet spirals have been proposed to solve this problem.
  • These spirals comprise an end curve which extends above the plane of the hairspring from the outer turn thereof and whose shape is chosen to change the position of the center of gravity of the hairspring and make it coincide with its center of rotation. .
  • This curve is known as the Philips curve. It participates in the elastic deformations of the spiral and allows the latter to deform concentrically during its operation. It consists of circular and / or rectilinear segments and is obtained by deformation of the outer turn of an initial planar spiral.
  • a disadvantage of this Philips curve is that it tends, over time, to return to its original shape of spiral section and therefore does not retain the shape to coincide the centers of gravity and rotation.
  • the present invention aims to provide a spiral Breguet type which retains its shape and therefore its ability to deform concentrically without the need to use the aforementioned heat treatment.
  • a Breguet type watch winder comprising a portion having, in top view, a spiral shape and extended by a terminal curve located outside the spiral plane and serving to bring the center of gravity closer together of the spiral of its center of rotation, characterized in that the end curve consists of one or more sections of spiral and one or more elbows with permanent deformation.
  • the invention also provides a method for manufacturing a Breguet type watch winder, comprising a first step of manufacturing a planar hairspring, a second step of deforming the outer turn of the planar hairspring at a predetermined point to make it out of the planar spiral plane and a third step of deforming at least a portion of said outer turn after said point to form an end curve for bringing the center of gravity of the spiral of its center of rotation, characterized in that the third step is performed without deformation of the outer turn other than the formation of one or more elbows to permanent deformation.
  • a spiral spring or "spiral” 1 comprises a spiral plane portion 2 and a raised end curve 3 extending above the spiral plane portion 2 from a point 4 of the spiral outer 5 of the flat spiral portion 2.
  • the end curve 3 is made in one piece with the spiral plane portion 2.
  • the spiral 1 with its curve 3 is obtained by deformation of the outer turn 5 of an initial planetary spiral 6.
  • the hairspring 1 is intended to be fixed to the axis of a rocker by its inner end 7 by means of a ferrule and a peak by its outer end 8 which is formed by the end of the curve 3.
  • the center of rotation of the spiral 1 is the center O of the reference (O, x, y).
  • center of gravity of the hairspring 1 is permanently substantially coincides with the center of rotation O (seen from above), so that the turns of the spiral plane portion 2 of the hairspring 1 deform concentrically during the oscillations of the latter.
  • center of gravity of the hairspring 1
  • the hairspring 1 has one or more rigid parts, which is not the case in the illustrated example these parts are not taken into account in the calculation of the center of gravity.
  • the center of gravity in the sense of the invention is a center of deformation.
  • the end curve 3 consists of one or more spiral sections 9 and one or more bends 10.
  • the terminal curve 3 comprises two spiral sections 9 1 and 9 2 separated by an elbow 10 2 .
  • the terminal curve 3 could comprise a single spiral section or more than two spiral sections separated by bends.
  • a triple elbow 10 1 formed in point 4, defines the beginning of the terminal curve 3.
  • This triple elbow 10 1 comprises a vertical double elbow, S-shaped (not visible in the drawing), which "lifts" the curve 3 in other words, it comes out of the plane of the spiral plane part 2, and a horizontal elbow (visible in the drawing) which directs the curve 3 with respect to the outer turn 5.
  • the double vertical elbow could be distant from the horizontal elbow and be located before point 4.
  • the spiral part 2 would be planar up to the double vertical elbow then out of its plane while maintaining, in top view, its initial spiral shape, and this up to point 4 where the terminal curve 3 would start in the same plane as the end of the spiral portion 2.
  • the reference numeral 10 1 will only designate the horizontal elbow defining the beginning of the terminal curve 3. More generally, the mark 10 will designate the horizontal elbows 10 1 , 10 2 , etc.
  • all the elbows 10 have a greater curvature, and even much larger, than the local curvature of the spiral sections 9, to induce changes of direction of the curve 3. More precisely, all these elbows 10 are deformed. permanent, that is to say that their curvature is large enough that they do not tend to return to their original shape while remaining small enough not to cause rupture of the material.
  • Such elbows already exist in the racket planar spirals where they make it possible to move the end portion of the outer turn away from and concentrically to use a frequency adjustment racket. It has been found that these elbows remain stable, in other words they do not seek to regain their original shape, even without having been previously heat treated and although they participate in the elastic deformations of the spiral during operation. It is said that one has "broken the nerve of matter".
  • the double vertical elbow for lifting the terminal curve 3 is also permanent deformation, as in the usual Breguet spirals.
  • the sections of spiral 9 retain the shape they had in the initial spiral plan 6.
  • the dashed line at the mark 6 shows the initial position and shape of the curve 3.
  • the curve 3 constitutes an end portion of the outer turn 5 of the planar spiral 6.
  • the position and the definitive shape of the curve 3, shown in full line, is obtained without deformation of the outer turn 5 other than that of forming the elbows 10.
  • the spiral sections 9 are not not subjected to deformation stresses so that their shape remains stable without the need to heat treat them.
  • these spiral sections 9 deform elastically during the oscillations of the spiral 1.
  • the position and the angular length of the bends 10 are such that at any time, the hairspring 1 is in the state of rest, extension or contraction, the center of gravity of the hairspring 1 is substantially coincident with the center of rotation O.
  • the flat hairspring 6 is first produced, typically by winding a blade of constant thickness and thickness around the center O. In a traditional manner, this hairspring 6 is then subjected to heat treatment to release the blade of deformation stresses generated by the winding.
  • the planar hairspring 6 can be produced by a micro-manufacturing technique, such as the LIGA technique. Once the planar hairspring 6 has been manufactured, its outer turn 5 is deformed at discrete points to form the vertical double elbow and the horizontal elbows 10. No deformation is applied to the spiral sections 9 between the elbows 10 and between the last elbows 10 and the end of the outer turn, or between the vertical double elbow and the elbow 10 1 .
  • Each integral ( ⁇ L x * dl) and ( ⁇ L y * dl) is decomposed into the sum of several integrals respectively corresponding to the length section L 0 of the spiral (spiral part 2), to the first bend 10 1 of the curve 3, the first spiral section 9 1 of length L 1 of curve 3, the second bend 10 2 of curve 3, the second spiral section 9 2 of length L 2 of curve 3, etc.
  • N 1 N 0 + ⁇ 1
  • Y 1 Y 0 - r vs * sin NOT 0 + r vs * sin NOT 1
  • the point (X 1 , Y 1 ) of output of the first bend 10 1 is derived from the point (X 01 , Y 01 ) of the initial spring 6 located at length L 01 .
  • Form the first bend 10 1 is to perform a geometric transformation formed on the one hand by a translation of the point (X 01 , Y 01 ) to the point (X 1 , Y 1 ) and on the other hand by a rotation of the normal N 01 to the normal N 1 .
  • the procedure is similar, that is to say, for each elbow, by calculating the point of the spiral initial 6 corresponding to the exit point of the elbow and the rotation of normals between the original curve 6 and the final curve 3, then calculating the coordinates of the points of the original curve and performing the translation + rotation transformation which replaces the section spiral out of the elbow and tangent to it.
  • the unknowns of the equations (eq 1), (eq 2) and (eq 3) are L 0 , ⁇ 1 and L 1 .
  • the unknowns are L 0 , ⁇ 1 and L 1 and we therefore have three equations and three unknowns giving a single solution.
  • the position of the peak is imposed, which can be a constraint in the design of the watch movement.
  • a number of spiral sections 9 will be chosen for the raised curve 3 greater than one, in order to offer a certain freedom in the choice of the position of the peak. In the latter case, however, the number of unknowns becomes greater than three. It is therefore necessary to add equations.
  • These equations can be determined by desired boundary conditions.
  • a raised curve 3 comprising two spiral sections 9 1 and 9 2 , of respective lengths L 1 and L 2 , as in the example shown in the drawing, it is possible to choose as boundary conditions the fact that that the end 8 of the curve 3 is tangential to a circle whose center (in plan view) is the center of rotation O and that the angle ⁇ 2 traversed by the last spiral section 9 2 of the curve 3, or , which amounts to the same, the length L 2 , has a desired value.
  • These conditions make it possible to choose the position of the peak, with a certain freedom, and makes possible the use of an eccentric frequency adjustment racket, mounted on a pivot axis which is parallel but distinct from the balance shaft.
EP07014128A 2007-07-19 2007-07-19 Breguet-Spiralfeder für Uhr und Verfahren zu deren Herstellung Withdrawn EP2017681A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07014128A EP2017681A1 (de) 2007-07-19 2007-07-19 Breguet-Spiralfeder für Uhr und Verfahren zu deren Herstellung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07014128A EP2017681A1 (de) 2007-07-19 2007-07-19 Breguet-Spiralfeder für Uhr und Verfahren zu deren Herstellung

Publications (1)

Publication Number Publication Date
EP2017681A1 true EP2017681A1 (de) 2009-01-21

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EP07014128A Withdrawn EP2017681A1 (de) 2007-07-19 2007-07-19 Breguet-Spiralfeder für Uhr und Verfahren zu deren Herstellung

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH705234A1 (fr) * 2011-07-14 2013-01-15 Breitling Montres Sa Méthode de détermination de la géometrie d'un spiral.
CN112307561A (zh) * 2020-10-30 2021-02-02 泉州装备制造研究所 大型装备上多体复杂结构装配用的位姿协调方法及系统

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US570394A (en) * 1896-10-27 Hair-spring for watches
EP1605323A2 (de) * 2004-04-13 2005-12-14 Coredem S.A. Spiralfeder für mechanisches Uhrwerk

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US570394A (en) * 1896-10-27 Hair-spring for watches
EP1605323A2 (de) * 2004-04-13 2005-12-14 Coredem S.A. Spiralfeder für mechanisches Uhrwerk

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"vom "Geheimnis" der Breguetspirale", NEUE UHRMACHER ZEITUNG, February 1984 (1984-02-01), Ulm (Deutschland), pages 46 - 49, XP001219436 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH705234A1 (fr) * 2011-07-14 2013-01-15 Breitling Montres Sa Méthode de détermination de la géometrie d'un spiral.
EP2546705A1 (de) * 2011-07-14 2013-01-16 Breitling AG Verfahren zur Bestimmung der Geometrie einer Spirale
CN112307561A (zh) * 2020-10-30 2021-02-02 泉州装备制造研究所 大型装备上多体复杂结构装配用的位姿协调方法及系统

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