EP3575885B1 - Federhaus für uhren - Google Patents

Federhaus für uhren Download PDF

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Publication number
EP3575885B1
EP3575885B1 EP18175570.3A EP18175570A EP3575885B1 EP 3575885 B1 EP3575885 B1 EP 3575885B1 EP 18175570 A EP18175570 A EP 18175570A EP 3575885 B1 EP3575885 B1 EP 3575885B1
Authority
EP
European Patent Office
Prior art keywords
mainspring
radius
coils
spring
barrel
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.)
Active
Application number
EP18175570.3A
Other languages
English (en)
French (fr)
Other versions
EP3575885A1 (de
Inventor
Jonas Vannod
Christian Charbon
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.)
Nivarox Far SA
Original Assignee
Nivarox Far 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 Nivarox Far SA filed Critical Nivarox Far SA
Priority to EP18175570.3A priority Critical patent/EP3575885B1/de
Priority to US16/401,300 priority patent/US11320786B2/en
Priority to JP2019097324A priority patent/JP6754866B2/ja
Priority to CN201910455016.4A priority patent/CN110554594B/zh
Publication of EP3575885A1 publication Critical patent/EP3575885A1/de
Application granted granted Critical
Publication of EP3575885B1 publication Critical patent/EP3575885B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • G04B1/00—Driving mechanisms
    • G04B1/10—Driving mechanisms with mainspring
    • G04B1/14—Mainsprings; Bridles therefor
    • G04B1/145—Composition and manufacture of the springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/06—Bending into helical or spiral form; Forming a succession of return bends, e.g. serpentine form
    • B21D11/07—Making serpentine-shaped articles by bending essentially in one plane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/10—Bending specially adapted to produce specific articles, e.g. leaf springs
    • 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
    • G04B1/00—Driving mechanisms
    • G04B1/10—Driving mechanisms with mainspring
    • G04B1/16—Barrels; Arbors; Barrel axles
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D3/00—Watchmakers' or watch-repairers' machines or tools for working materials
    • G04D3/0002—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe
    • G04D3/0005—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe for parts of driving means
    • G04D3/001—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe for parts of driving means for spring barrels

Definitions

  • the present invention relates to the field of watchmaking and more specifically to a barrel fitted with a barrel spring having, at the end of its manufacturing process, a zone of substantially zero curvature of increased length.
  • barrel springs are preformed by a calendering process in order to ensure a stress greater than the elastic limit over the entire length of the spring when it is drummed. This guarantees that the spring can in use provide all of the available energy.
  • a calendering process for barrel springs is, for example, described in the document CH 712 533 .
  • the spring comprises a shell of curvature opposite to that of the calendered part and separated from the latter by a neck of length L C having zero curvature as shown in figure 1 of the aforementioned document.
  • the document JP2017142215 also describes a mainspring having a neck of substantially zero curvature around the point of inflection.
  • the object of the present invention is to remedy the aforementioned drawbacks by proposing a barrel comprising a barrel spring configured to reduce, at the critical point, its plastic deformation when it is put in place in the armed state.
  • the present invention proposes to lengthen the neck of substantially zero curvature preceding the calendered part. More precisely, the length of the neck is adjusted to be between 1.5 and 10 times, and preferably between 2 and 8 times, the outer radius of the calendered part at the end of the manufacturing process.
  • the spring is particularly suitable for applications with a small barrel bung radius allowing a greater number of turns to be wound. It is thus more specifically adapted for values of k less than 10.
  • the geometry of the spring also guarantees proper operation of the spring with an efficiency between winding and unwinding greater than or equal to 80%.
  • the present invention relates to a barrel comprising a barrel spring 1 shown in figure 1 in the manufactured state.
  • Manufactured state is understood to mean the initial state of manufacture, before any assembly within the barrel drum.
  • the barrel spring according to the invention is more specifically suitable for applications with a factor k (ratio of the diameter of the barrel bung to the thickness of the spring) greater than or equal to 5 and less than 10.
  • It conventionally comprises a coquillon 2 and a part 3 formed of turns with an outer turn of radius R.
  • the turns can be contiguous as shown in figure 1 or distant from each other (not shown).
  • Shell 2 is connected to part 3 by a neck 4 having substantially zero curvature forming a zone of inflection between shell 2 and part 3 of opposite curvature to that of the shell.
  • the coquillon 2 and the part 3 formed of turns are manufactured in known manner, for example, by hammering and calendering respectively.
  • the neck has the characteristic of having an increased length L C compared to the springs of the prior art typically having Lc values less than or equal to the radius R of the outer turn. More specifically, in the manufactured state, this length L C is greater than the outer radius R of part 3 with values between 1.5 and 10 times the radius R and preferably between 2 and 8 times the radius R. Typically, the outer radius R is between 2 and 10 mm.
  • the barrel spring according to the invention has a radius R of 5 mm and a length L C of 40 mm. It has, for other dimensions, a total deployed length of 500 mm, a thickness of 90 ⁇ m and a shell diameter adjusted for a plug with a diameter of 1.5 mm, that is to say typically between 1 mm and 1.5 mm. .
  • the mainspring of the barrel according to the invention thus has an optimized geometry which makes it possible in use to reduce its fragility.
  • winding and unwinding torque measurements have demonstrated that this spring geometry guarantees proper operation of the spring with an efficiency between the torque provided during unwinding and that required for winding greater than or equal to 80%.
  • the figure 2 represents the winding (upper curve) and unwinding (lower curve) curves for measurements taken after a winding half-turn. For this example, a yield of 84% was obtained.
  • the mainspring of the barrel according to the invention can, by way of example, be made of an austenitic stainless steel or of a Nivaflex ® alloy based on cobalt-nickel-chromium comprising by weight from 44 to 46% of cobalt, from 20 to 22% nickel, 17-19% chromium, 4-6% iron, 3-5% tungsten, 3-5% molybdenum, 0-2% titanium, 0-1% of beryllium.

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  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Springs (AREA)

Claims (10)

  1. Federgehäuse für die Uhrmacherei, umfassend eine Trommel und eine Federgehäusefeder (1) umfassend, im gefertigten Zustand, vor jeder Montage innerhalb der Trommel, ein Federherz (2), das dazu bestimmt ist, mit einem Bund und einem Teil (3) verbunden zu werden, der aus Windungen gebildet ist, mit einer äußeren Windung mit einem Radius R, wobei das Federherz (2) und der Teil (3), der aus Windungen gebildet wird, durch einen Hals (4) verbunden sind, der eine Krümmung von im Wesentlichen Null aufweist, wobei das Federgehäuse für die Uhrmacherei (1) dadurch gekennzeichnet ist, dass der Hals (4) eine Länge Lc aufweist, die zwischen 1,5- und 10-mal dem Radius R liegt.
  2. Federgehäuse nach Anspruch 1, dadurch gekennzeichnet, dass der Hals (4) eine Länge Lc aufweist, die zwischen 2- und 8-mal dem Radius R liegt.
  3. Federgehäuse nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Radius R zwischen 2 und 10 mm liegt.
  4. Federgehäuse nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, dass der Teil (3), der durch Windungen gebildet wird, durch anliegende Windungen gebildet wird.
  5. Federgehäuse nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, dass der Teil (3), der durch Windungen gebildet wird, durch Windungen gebildet wird, die voneinander beabstandet sind.
  6. Federgehäuse nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass es für Anwendungen mit einem Faktor k größer oder gleich 5 und kleiner als 10 bestimmt ist, wobei der Faktor k als das Verhältnis zwischen dem Radius des Bundes des Federgehäuses und der Dicke der Feder definiert ist.
  7. Federgehäuse nach einem der vorstehenden Ansprüche,
    dadurch gekennzeichnet, dass nach Montage innerhalb der Federgehäusetrommel die Leistung zwischen dem Drehmoment, das beim Entspannen der Federgehäusefeder (1) bereitgestellt wird, und dem Drehmoment, das zum Einspannen benötigt wird, bereitgestellt wird, größer oder gleich 80 % ist.
  8. Federgehäuse nach einem der vorstehenden Ansprüche,
    dadurch gekennzeichnet, dass die Feder (1) aus einer Legierung auf Basis von Kobalt-Nickel-Chrom gefertigt ist, das in Gewicht 44 bis 46 % an Kobalt, 20 bis 22 % an Nickel, 17 bis 19 % an Chrom, 4 bis 6 % an Eisen, 3 bis 5 % an Wolfram, 3 bis 5 % an Molybdän, 0 bis 2 % an Titan, 0 bis 1 % an Beryllium beinhaltet.
  9. Federgehäuse nach einem der Ansprüche 1 bis 7,
    dadurch gekennzeichnet, dass die Feder (1) aus einem nicht rostenden austenitischen Stahl gefertigt ist.
  10. Uhr, umfassend das Federgehäuse nach einem der vorstehenden Ansprüche.
EP18175570.3A 2018-06-01 2018-06-01 Federhaus für uhren Active EP3575885B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP18175570.3A EP3575885B1 (de) 2018-06-01 2018-06-01 Federhaus für uhren
US16/401,300 US11320786B2 (en) 2018-06-01 2019-05-02 Mainspring
JP2019097324A JP6754866B2 (ja) 2018-06-01 2019-05-24 メインばね
CN201910455016.4A CN110554594B (zh) 2018-06-01 2019-05-29 主发条

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18175570.3A EP3575885B1 (de) 2018-06-01 2018-06-01 Federhaus für uhren

Publications (2)

Publication Number Publication Date
EP3575885A1 EP3575885A1 (de) 2019-12-04
EP3575885B1 true EP3575885B1 (de) 2022-09-21

Family

ID=62495713

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18175570.3A Active EP3575885B1 (de) 2018-06-01 2018-06-01 Federhaus für uhren

Country Status (4)

Country Link
US (1) US11320786B2 (de)
EP (1) EP3575885B1 (de)
JP (1) JP6754866B2 (de)
CN (1) CN110554594B (de)

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2192101A (en) * 1937-06-08 1940-02-27 American Steel & Wire Co Spiral spring
DE1673629A1 (de) * 1966-04-30 1972-04-20 Citizen Watch Co Ltd Aufzugsfeder fuer ein Federtriebwerk
US3433011A (en) * 1966-04-30 1969-03-18 Citizen Watch Co Ltd Barrel spring
US4464216A (en) * 1982-03-26 1984-08-07 Hercules Incorporated Composite negator springs
WO1999012080A1 (en) * 1997-08-28 1999-03-11 Seiko Epson Corporation Spring, power spring, hair spring, driving mechanism utilizing them, and timepiece
US6863435B2 (en) * 1997-08-11 2005-03-08 Seiko Epson Corporation Spring, mainspring, hairspring, and driving mechanism and timepiece based thereon
JP2005140674A (ja) * 2003-11-07 2005-06-02 Seiko Epson Corp 時計用ばね、ぜんまい、ひげぜんまい、及び時計
CH698962B1 (fr) * 2008-06-10 2014-10-31 Rolex Sa Ressort de barillet et procédé pour sa mise en forme.
EP2570864B1 (de) * 2011-09-15 2018-11-14 Blancpain S.A. Uhren-Federgehäuse mit reduziertem Durchmesser
EP2706415A3 (de) * 2012-09-05 2017-06-14 Seiko Epson Corporation Verfahren zur Herstellung einer Uhrfeder, Vorrichtung zur Herstellung einer Uhrfeder, Uhrfeder und Uhr
EP2746868B1 (de) * 2012-12-18 2016-04-27 ETA SA Manufacture Horlogère Suisse Federgehäuse einer Uhr
JP2017142215A (ja) * 2016-02-12 2017-08-17 セイコーインスツル株式会社 ぜんまい、香箱車、ムーブメント、時計及びぜんまいの製造方法
CH712533B1 (fr) 2016-06-10 2022-02-15 Nivarox Sa Calandre et procédé de calandrage de ressort de barillet d'horlogerie.
JP7133909B2 (ja) * 2016-07-04 2022-09-09 ロレックス・ソシエテ・アノニム 時計用組立体の製造方法、及び該製造方法により得られる時計用組立体

Also Published As

Publication number Publication date
EP3575885A1 (de) 2019-12-04
CN110554594B (zh) 2021-05-11
US20190369558A1 (en) 2019-12-05
JP2019211471A (ja) 2019-12-12
JP6754866B2 (ja) 2020-09-16
US11320786B2 (en) 2022-05-03
CN110554594A (zh) 2019-12-10

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