EP3839653A1 - Korrekturverfahren der ganggenauigkeit und/oder der amplitude eines oszillators vom typ spiralunruh mit vertikalen positionen - Google Patents

Korrekturverfahren der ganggenauigkeit und/oder der amplitude eines oszillators vom typ spiralunruh mit vertikalen positionen Download PDF

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Publication number
EP3839653A1
EP3839653A1 EP19218481.0A EP19218481A EP3839653A1 EP 3839653 A1 EP3839653 A1 EP 3839653A1 EP 19218481 A EP19218481 A EP 19218481A EP 3839653 A1 EP3839653 A1 EP 3839653A1
Authority
EP
European Patent Office
Prior art keywords
pivot
oscillator
amplitude
pivots
bearing
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.)
Pending
Application number
EP19218481.0A
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English (en)
French (fr)
Inventor
Jean-Baptiste LE BRIS
Jean-Luc Bucaille
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.)
Patek Philippe SA Geneve
Original Assignee
Patek Philippe SA Geneve
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 Patek Philippe SA Geneve filed Critical Patek Philippe SA Geneve
Priority to EP19218481.0A priority Critical patent/EP3839653A1/de
Publication of EP3839653A1 publication Critical patent/EP3839653A1/de
Pending legal-status Critical Current

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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
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/06—Oscillators with hairsprings, e.g. balance
    • G04B17/063—Balance construction

Definitions

  • the present invention relates to a method for correcting the rate and / or the amplitude of an oscillator of the spring balance type in vertical positions.
  • a traditional balance-spring type oscillator shown in figures 1a and 1b is composed of a balance 1 and a spiral spring attached by its ends to the balance 1 and to the pin 9 itself fixed to the cock.
  • the balance 1 is formed by a rim 1a integral with a balance axis 2.
  • the balance axis 2 comprises two pivots 3, 4 without bearing formed by a cylindrical part 3a, 4a connected by a fillet 3b, 4b to the tigeron of axis 2. Pivots 3, 4 pass through the hole of a pivot stone 5, 6 and press by their rounded end or pivot end 3c, 4c against the face of a second stone called counterpivot or counter-stone 7, 8.
  • a lubricant is used to improve the pivoting between the pivots 3, 4 and the pivot stones 5, 6 and the counter stones 7, 8.
  • the dimensions of the pivots 3, 4 and the holes in the pivot stones 5, 6 are generally less than 100 ⁇ m.
  • the balance axis 2 also carries, on one side of the balance 1, at least one plate 10 as well as the plate pin 11, through which the exhaust impulse arrives.
  • the oscillations of a sprung balance maintained by an escapement are not isochronous, that is to say they do not all occur in equal time.
  • the duration of the oscillations of a spiral balance, and therefore its isochronism i.e. its ability to oscillate in equal times, regardless of external influences, see Illustrated Professional Dictionary of Watchmaking, G.-A . Berner) is disturbed by the following main factors: the escapement, the contact between the pivots of the balance shaft and their bearings (stones and counter stones), the balance of the balance-spring assembly, faults of the whole and the shape of the hairspring.
  • Watchmakers generally study the oscillations of a sprung balance maintained by an escapement in six determined positions of said sprung balance and of the watch: two horizontal positions, horizontal up (HH, on bottom, natural position of the hand in pronation) and horizontal down (HB, on glass, position rarely observed when carrying the hand in supination) and four vertical positions, vertical up (VH, 3h up), vertical down (VB, 9h up), vertical right (VD, 12 o'clock above) and vertical left (VG, 6 o'clock above).
  • the observed period T is shorter than the theoretical period T o , the sprung balance is faster, the instantaneous rate is positive and the movement is ahead. Conversely, if the observed period T is longer than the theoretical period T o , the balance-hairspring is slower, the instantaneous rate is negative and the movement is lagging behind.
  • isochronism curves characterizing the isochronism of an oscillator of the balance-spring type maintained by an escapement.
  • the figure 2a illustrates these isochronism curves in the six typical positions.
  • the watchmaker considers more generally the range of amplitudes between 180 ° and 300 ° visible on the figure 2b .
  • the loss of amplitude is greater in the vertical positions than in the horizontal positions (on the figure 2a : maximum amplitude around 260 ° for vertical positions, against a maximum amplitude of 285 ° for horizontal positions). This is due to the fact that the friction is greater in the vertical positions than in the horizontal positions, since the contacts are different.
  • the vertical positions correspond to the balance resting on two stones (the resistant couple: lever arm linked to the radius of the pivot cylinder) while the horizontal positions correspond to the balance resting on a counter-stone (the resistant couple: lever arm related to the radius of the pivot end).
  • the balance 1 is not fixed symmetrically with respect to the pivots 3, 4 on the balance axis 2 of the figure 1a , and that the ankle of the double plate is not coplanar with the balance, the curves obtained for the top horizontal HH and bottom horizontal HB positions are not equivalent in operation and in amplitude.
  • Watchmakers seek to optimize the operation of the sprung balance and therefore to reduce the steps (the back-glass offset and the flat-hanging offset in motion), to optimize isochronism and to maximize the amplitude of the oscillations. In in practice, it is rather a matter of ensuring that all the faults (friction, influence of the escapement, shape of the hairspring, balance, construction constraints, etc.) are zero or neutralize each other.
  • the aim of the present invention is to provide a method making it possible to correct the rate and / or the amplitude of an oscillator of the spring balance type in vertical positions.
  • the present invention relates to a method for correcting the rate and / or the amplitude at the vertical positions for a timepiece oscillator of the sprung balance type according to claim 1.
  • a spiral balance type oscillator illustrated in figures 1a and 1b has already been partially described above.
  • the axis of the balance 2 supports by its two pivots 3, 4 in the holes of the pivot stones 5, 6.
  • the friction in the vertical positions is divided between a rolling friction and a sliding friction for the rest of the oscillation. This short rolling phase is responsible for an advance of several seconds per day and therefore has an influence on walking.
  • the clearance between a pivot 3, 4 of the oscillator and its respective pivot stone 5, 6 corresponds to the difference between the inside diameter of the hole of the pivot stone 5, 6 and the outside diameter of the pivot 3, 4.
  • the Applicant has been able to establish a link between the play between the pivots and their respective stone and the step in the vertical positions, when said pivots are supported in said stones.
  • This link is illustrated by the curve of the figure 7 for an amplitude between 260 ° and 270 °. It is possible to obtain results similar to those of the figure 7 for all other amplitudes. It has in fact been observed that the curves obtained are similar and only undergo a vertical shift.
  • the play is increased for the two pivot / bearing pairs of the oscillator in order to maintain symmetry in the pivoting.
  • the present invention relates to a method for correcting the rate and the amplitude at the vertical positions for an oscillator of the spring balance type of a clockwork movement.
  • the first step of the method consists in providing an assembly formed by an oscillator of the spiral balance type comprising an axis terminated by two pivots and two pivot bearings in which the pivots of the oscillator pivot in the vertical positions of the oscillator.
  • Each bearing comprises a hole characterized by an internal diameter while each pivot has an external diameter strictly less than said internal diameter of the pivot bearings.
  • the reference frame between the pivots and their respective bearing defined as the difference between the internal diameter of the bearing and the external diameter of the pivots is determined.
  • the third step consists in correcting the rate and / or the amplitude of the oscillations of the oscillator in the vertical positrons by increasing the reference beam either by increasing the internal diameter of the bearing or by decreasing the external diameter of the pivot for the one or both bearing / pivot pairs of the oscillator.
  • the reference range between the pivots and their respective bearing defined as the difference between the internal diameter of the bearing and the external diameter of the pivots is approximately 12 ⁇ m and the method according to the invention consists of acting on the bearing and / or the pivot so as to increase the internal diameter of the hole in the bearing or decrease the external diameter of the pivot to obtain a clearance greater than 12 ⁇ m.
  • the rate and / or the amplitude of the oscillations of the oscillator in the vertical positions can be determined for free or maintained oscillations. That is to say, the process can include a further step consisting in providing a clockwork movement comprising an escape mechanism intended to maintain the oscillations of the oscillator and that the rate and / or the amplitude of the oscillations of the oscillators maintained by said escape mechanism be corrected.
  • Any suitable technical means can be used to act on the bearing and / or the pivot so as to increase the internal diameter of the hole in the bearing or reduce the external diameter of the pivot.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
EP19218481.0A 2019-12-20 2019-12-20 Korrekturverfahren der ganggenauigkeit und/oder der amplitude eines oszillators vom typ spiralunruh mit vertikalen positionen Pending EP3839653A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19218481.0A EP3839653A1 (de) 2019-12-20 2019-12-20 Korrekturverfahren der ganggenauigkeit und/oder der amplitude eines oszillators vom typ spiralunruh mit vertikalen positionen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19218481.0A EP3839653A1 (de) 2019-12-20 2019-12-20 Korrekturverfahren der ganggenauigkeit und/oder der amplitude eines oszillators vom typ spiralunruh mit vertikalen positionen

Publications (1)

Publication Number Publication Date
EP3839653A1 true EP3839653A1 (de) 2021-06-23

Family

ID=69185150

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19218481.0A Pending EP3839653A1 (de) 2019-12-20 2019-12-20 Korrekturverfahren der ganggenauigkeit und/oder der amplitude eines oszillators vom typ spiralunruh mit vertikalen positionen

Country Status (1)

Country Link
EP (1) EP3839653A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1986059A1 (de) * 2007-04-26 2008-10-29 ETA SA Manufacture Horlogère Suisse Schwenkenvorrichtung einer Welle in einer Uhr
EP2551732A1 (de) * 2011-07-29 2013-01-30 Rolex S.A. Unruh mit optimierter Drehbewegung
CH708217A2 (fr) * 2013-05-31 2014-12-15 Breitling Montres Sa Pivot de balancier.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1986059A1 (de) * 2007-04-26 2008-10-29 ETA SA Manufacture Horlogère Suisse Schwenkenvorrichtung einer Welle in einer Uhr
EP2551732A1 (de) * 2011-07-29 2013-01-30 Rolex S.A. Unruh mit optimierter Drehbewegung
CH708217A2 (fr) * 2013-05-31 2014-12-15 Breitling Montres Sa Pivot de balancier.

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