EP3223085A1 - Vorrichtung, die eine schnelleinstellfeder für uhrwerke umfasst - Google Patents

Vorrichtung, die eine schnelleinstellfeder für uhrwerke umfasst Download PDF

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Publication number
EP3223085A1
EP3223085A1 EP17162414.1A EP17162414A EP3223085A1 EP 3223085 A1 EP3223085 A1 EP 3223085A1 EP 17162414 A EP17162414 A EP 17162414A EP 3223085 A1 EP3223085 A1 EP 3223085A1
Authority
EP
European Patent Office
Prior art keywords
spring
finger
mobile
teeth
star
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
Application number
EP17162414.1A
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English (en)
French (fr)
Other versions
EP3223085B1 (de
Inventor
Frédéric Dreyer-Gonzales
Arnaud HOURIET
Frédéric Rondeau
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.)
Officine Panerai AG
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Officine Panerai AG
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Publication date
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Publication of EP3223085A1 publication Critical patent/EP3223085A1/de
Application granted granted Critical
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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
    • G04B19/00—Indicating the time by visual means
    • G04B19/22—Arrangements for indicating different local apparent times; Universal time pieces
    • G04B19/221—Arrangements for indicating different local apparent times; Universal time pieces mechanisms for correcting the hours hand only, i.e. independently for minutes and seconds hands
    • 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
    • G04B19/00—Indicating the time by visual means
    • G04B19/22—Arrangements for indicating different local apparent times; Universal time pieces
    • G04B19/23—Arrangements for indicating different local apparent times; Universal time pieces by means of additional hands or additional pairs of hands
    • G04B19/235—Arrangements for indicating different local apparent times; Universal time pieces by means of additional hands or additional pairs of hands mechanisms for correcting the additional hand or hands

Definitions

  • the present invention relates to a device comprising a quick adjustment spring for a watch movement in which the spring is more compact, has a reduced risk of breakage and has a longer service life than a conventional quick-adjusting spring.
  • GTT Greenwich Mean Time
  • a GMT watch typically comprises an elastic clutch device comprising a spindle spring.
  • the spindle spring allows the time setting of the second time zone, by moving the second hour hand (or GMT hand) in successive jumps of an entire hour.
  • the first hour hand, the minute hand and the second hand are not influenced by this operation.
  • the figure 4 shows such spring pin 1 cooperating with a star 4 to twelve teeth 41 kinematically connected to the GMT needle.
  • the spring 1 comprises two flexible arms 21 and two fingers 3 exerting a compressive force on the teeth 41 of the star 4. When the fingers 3 move between a hollow between two successive teeth 41 and the top of one of the teeth, the arm 21 are biased.
  • spindle springs of this type are typically made of "maraging C300" or “Durnico®” steel or the like. These spindle springs have a limited life, ranging from 4 (element in Durnico) to 20 years (element in Nivaflex). The life has a character random, due in particular to the length of the arms 21 and their small sections. However, it is difficult to make such a spring with larger arm sections without losing the elastic properties of the arms, necessary for the proper functioning of the spring. The available manufacturing techniques impose a ratio between the thickness and the width of the arms at a ratio close to 1.
  • An object of the present invention is to provide a device comprising a rapid adjustment spring free from the limitations of known devices, particularly in terms of freedom of design including its form factor, its thickness and / or its width.
  • Another object of the invention is to provide a device comprising a rapid adjustment spring of compact geometry and which reduces the risk of rupture and the random nature of the break.
  • a device comprising a fast adjusting spring cooperating with a mobile of a watch movement, the spring comprising a finger and a flexible part located on either side of said finger so as to achieve a closed geometry, the finger cooperating with the mobile so as to be movable in a maximum displacement by a movement of the mobile and to exert a force against the mobile due to the flexion of the flexible portion; at least the flexible portion of the spring being made of an amorphous metal alloy.
  • the amorphous metal alloy in which at least the flexible portion of the spring is made has a ratio of the elastic limit on its Young's modulus which is at least 0.010, preferably 0.015, and more than preferably at least 0.02.
  • the dimensioning of the flexible portion limits the ratio of the maximum stress on the elastic limit to 0.70 at the maximum and preferably 0.64 at the maximum, during the maximum displacement of the finger.
  • the constraints on the form factors are much less severe compared to conventional materials.
  • a quick-adjust spring 1 is shown at figure 1 according to one embodiment.
  • the spring 1 is intended to operate in a resilient clutch device of a secondary display indicating the time zone time (not shown), for example by moving a needle (also not shown) in successive jumps of an entire hour.
  • the spring 1 comprises a flexible portion 2 having two flexible arms 21, each having an arc shape so that the two arms form a continuous geometry and closed on itself.
  • Each of the arms 21 ends with a finger 3 arranged to cooperate with the teeth 41 of a star 4 to twelve teeth 41.
  • figure 1 an hour wheel 6 is also shown.
  • the hour wheel 6 is typically driven by a timer (not shown) and itself drives the star 4 in rotation.
  • the finger 3 comprises a projection 31 which is housed in a hollow between two successive teeth 41 of the star with twelve teeth 41.
  • the arms 3 exert a compressive force on the teeth 41 of the star 4.
  • the projections 31 of the fingers 3 of the spring 1 deviate from their rest position in a hollow between two teeth 41 of the star 4 and fall into the immediately following hollow under the effect of their elasticity and the compressive force exerted by the flexible portion 2.
  • the spring 1 thus makes it possible to define twelve stable positions for the secondary hour hand.
  • the two arms 21 are substantially symmetrical so that the two fingers 3 are arranged diametrically opposed, each of the fingers 3 exerting a restoring force towards the axis 42 of pivoting of the star 4.
  • the configuration of the arms 21 allows each fingers 3 to exert a symmetrical force towards the pivot axis 42 of the star 4.
  • the maximum displacement of the finger 3 corresponds to the spacing of the finger 3 between a first position of the spring 1 where each of the fingers 3 are in a hollow between two teeth 41 and a second position of the spring 1 where the fingers 3 are each on the top of a tooth 41.
  • the maximum displacement of the finger 3 therefore corresponds generally to the height of the teeth 41.
  • the deformation of the finger and the spring may be more large if there is pre-arming at rest to guarantee the impact resistance of the needle or the indicator associated with star 4.
  • the figure 1 shows the spring in the first position.
  • the spring is shown in the second position.
  • Each of the fingers 3 may comprise a pin 8 slidable in an oblong opening (not visible) made in another component (as the hub of the hour wheel 6) and adapted to receive the pin 8.
  • the oblong openings allow to guide the fingers 3 and impose them a precise positioning.
  • the oblong openings may also be of rectangular shape or any other suitable form.
  • At least the flexible portion 2 of the spring 1 is made of an amorphous metal alloy having a ratio of the elastic limit stress ⁇ lim on its Young's modulus which is at least 0.010, preferably 0.015, and still preferably at least 0.02.
  • a ratio of the elastic limit stress ⁇ lim on its Young's modulus which is at least 0.010, preferably 0.015, and still preferably at least 0.02.
  • the assembly of the spring 1 is manufactured in the massive amorphous metal alloy.
  • the amorphous metal alloy comprises a metallic glass.
  • the metallic glasses do not have a precise crystallographic structure and are in a vitreous state. This gives them very particular properties. From a mechanical point of view, the phenomena of deformation and rupture known in crystalline metals are no longer necessary. It has also been shown that the chemical stability of solid amorphous alloys is superior to that of conventional alloys.
  • the metallic glasses have a relatively low Young's modulus.
  • Young's modulus of a metallic glass is about two times lower than that of an alloy such as X2NiCoMo18-9-5 steel known under the name "maraging C300" or “Durnico®” while having a limit at break substantially equivalent to that of Durnico.
  • the Durnico is typically used in watchmaking for the manufacture of complicated parts with high spring properties and fatigue resistance.
  • a metal glass spring will have an elongation at break approximately twice as large as for the same Durnico spring. It is therefore possible to operate a metal glass spring over a larger deformation range.
  • the figure 3 represents the spring 1 showing simulations of the displacements of the arms 21 and the fingers 3 of the spring 1, as well as the stresses undergone by the different parts of the spring 1.
  • the displacements and the simulated stresses are shown for the spring 1 in the second position, that is to say when the fingers 3 are each at the top of one of the teeth 41.
  • the spring 1 is made of zirconia-based metal glass, Zr (Zr-BMG) characterized by a density of 6830 kg / m 3 , an elastic limit stress ⁇ lim of 1620 N / mm 2 and a Young's modulus of 81000 N / mm 2 .
  • the Zr-BMG alloy can include copper, nickel and aluminum as well.
  • the maximum displacement of each of the arms 21, between the first position and the second position of the spring 1, is 0.26 mm (in the middle of the length of the arm 21).
  • the maximum displacement of each of the fingers 3, between the first position and the second position of the spring 1, is 0.19 mm.
  • the maximum stress ⁇ max calculated under these conditions is between 1028 N / mm 2 and 1032 N / mm 2 which results in a ratio ⁇ max / ⁇ lim of 0.64. No fatigue aging was found by the inventors after 10 7 Maximum displacement cycles fingers 3. The only observed rupture was attributed to wear phenomena caused by the friction between the spring 1 and the star 4.
  • the figure 4 shows a conventional spindle spring 1 made in Durnico® alloy, cooperating with a star 4 to twelve teeth 41.
  • the spring 1 is shown (in black) in a position where each of the fingers 3 are in a hollow between two teeth 41 and is shown (in wire) in a position where each of the fingers 3 are on the top of one of the teeth 41.
  • figure 5 represents the same type of simulations performed for the spring of the figure 3 .
  • Durnico® alloy is characterized by a density of 8.1 g / cm 3 , an elastic limit stress ⁇ lim between 1800 N / mm 2 and 2200 N / mm 2 and a Young's modulus of 195000 N / mm 2 .
  • the elastic limit stress ⁇ lim of the Durnico is similar to that of the metal glass Zr-BMG but its Young's modulus is about twice as high.
  • the flexible arms 21 must be longer when the spring 1 is manufactured in Durnico. We notice the arms 21 longer in the geometry of the spring 1 of the figure 4 as well as the folding of the arms more marked.
  • the maximum stress ⁇ max calculated is between 1681 N / mm 2 and 1718 N / mm 2 , which results in a ratio ⁇ max / ⁇ lim of 0.95 for a module of Young of 1800 N / mm 2 and 0.78 for a Young's modulus of 2200 N / mm 2 .
  • Such values for the ratio ⁇ max / ⁇ lim are high, making the spring sensitive to oligocyclic fatigue.
  • the metallic glasses having a Young's modulus smaller than for the alloys commonly used for horological applications, but a similar limit of rupture to these alloys makes it possible to exploit the metal glass spring over a wider range of deformation (the elongation at break is about twice as large as for the Durnico).
  • the properties of metal lenses allow the adoption of a spring geometry that is more compact and reduces stress concentrations.
  • the stresses are distributed in a more homogeneous way in the spring and the metallic glass works in a field more distant from the elastic limit, thus reducing the risk of rupture and the random nature of the rupture.
  • the metal glass spring 1 also has improved fatigue strength, reduced sensitivity to corrosion, and a reduced coefficient of friction compared to a spring made of a conventional alloy.
  • the form factor allowed by the use of this material is also of primary interest.
  • the above description describes a spindle spring for an elastic clutch of a secondary display indicating the time of the time zone.
  • the invention is not limited to such a spring but also applies to any type of quick adjustment spring and / or elastic member intended to operate in a watch movement.
  • the metal-glass spring of the invention may be a quick-setting spring, a rocker spring, a ratchet spring, a driving finger, or a jumper such as a pull-cord or a jumper of calendar settings.
  • the solid amorphous metal alloy, or the metallic glass can be shaped starting from a liquid alloy.
  • the solidification is then carried out with a very high cooling rate in order to avoid the crystallization of the material, but such a high speed greatly limits the maximum thickness that can be achieved.
  • Some massive amorphous metal alloys can be cooled at significantly lower speeds while maintaining an amorphous structure. These amorphous metal alloys allow the use of a much wider range of forming processes. For example, these alloys make it possible to manufacture solid metal glass parts by injection, thus making it possible to obtain more precise shape tolerances than by conventional stamping.
  • alloys also have a much more stable amorphous phase, which makes it possible to carry out various rework operations on the parts, without the material recrystallising.
  • finishes for example, polishing or satin finishing
  • a laser engraving method has been developed to meet the needs of industrial applications.
  • Metal glass injection processes require copper or silicon molds to ensure efficient cooling.
  • the thicknesses of the manufactured parts are limited to a few millimeters in order to extract enough heat and to allow a sufficiently fast cooling.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Springs (AREA)
EP17162414.1A 2016-03-23 2017-03-22 Vorrichtung, die eine schnelleinstellfeder für uhrwerke umfasst Active EP3223085B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH00397/16A CH712289A1 (fr) 2016-03-23 2016-03-23 Ressort de réglage rapide pour mouvement horloger.

Publications (2)

Publication Number Publication Date
EP3223085A1 true EP3223085A1 (de) 2017-09-27
EP3223085B1 EP3223085B1 (de) 2019-05-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP17162414.1A Active EP3223085B1 (de) 2016-03-23 2017-03-22 Vorrichtung, die eine schnelleinstellfeder für uhrwerke umfasst

Country Status (2)

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EP (1) EP3223085B1 (de)
CH (1) CH712289A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54118857U (de) * 1978-02-08 1979-08-20
EP1637942A1 (de) * 2004-09-15 2006-03-22 Frédéric Piguet S.A. Kalenderuhr mit Zeitgleichungsvorrichtung
EP2400355A1 (de) * 2010-06-22 2011-12-28 The Swatch Group Research and Development Ltd. Stoßsicheres System für Uhr
WO2012010941A1 (fr) * 2010-07-21 2012-01-26 Rolex S.A. Composant horloger comprenant un alliage métallique amorphe
WO2013102598A2 (fr) * 2011-12-27 2013-07-11 Rolex S.A. Ressort pour mouvement horloger

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54118857U (de) * 1978-02-08 1979-08-20
EP1637942A1 (de) * 2004-09-15 2006-03-22 Frédéric Piguet S.A. Kalenderuhr mit Zeitgleichungsvorrichtung
EP2400355A1 (de) * 2010-06-22 2011-12-28 The Swatch Group Research and Development Ltd. Stoßsicheres System für Uhr
WO2012010941A1 (fr) * 2010-07-21 2012-01-26 Rolex S.A. Composant horloger comprenant un alliage métallique amorphe
WO2013102598A2 (fr) * 2011-12-27 2013-07-11 Rolex S.A. Ressort pour mouvement horloger

Also Published As

Publication number Publication date
EP3223085B1 (de) 2019-05-08
CH712289A1 (fr) 2017-09-29

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