EP0217251B1 - Frein magnétique pour pièce d'horlogerie - Google Patents

Frein magnétique pour pièce d'horlogerie Download PDF

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Publication number
EP0217251B1
EP0217251B1 EP86113006A EP86113006A EP0217251B1 EP 0217251 B1 EP0217251 B1 EP 0217251B1 EP 86113006 A EP86113006 A EP 86113006A EP 86113006 A EP86113006 A EP 86113006A EP 0217251 B1 EP0217251 B1 EP 0217251B1
Authority
EP
European Patent Office
Prior art keywords
wheel
magnet
magnetic
steel
magnetic brake
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.)
Expired
Application number
EP86113006A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0217251A1 (fr
Inventor
Etienne Georges
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.)
ETA SA Manufacture Horlogere Suisse
Original Assignee
Eta SA Fabriques dEbauches
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 Eta SA Fabriques dEbauches filed Critical Eta SA Fabriques dEbauches
Publication of EP0217251A1 publication Critical patent/EP0217251A1/fr
Application granted granted Critical
Publication of EP0217251B1 publication Critical patent/EP0217251B1/fr
Expired 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
    • G04B35/00—Adjusting the gear train, e.g. the backlash of the arbors, depth of meshing of the gears

Definitions

  • the present invention relates to a train brake for a timepiece comprising a seconds wheel. It relates more particularly to a magnetic type brake with fixed magnet (DE-A-410 706).
  • the object of the present invention is to produce a train brake which does not require any additional space in height, and which generates a braking torque ensuring good positioning of the seconds hand, without appreciable increase in consumption.
  • This object is achieved thanks to the fact that the seconds wheel is made of magnetic steel and in that the magnet is located in line with the periphery of this wheel, radially set back from the teeth.
  • the plate 10 has a hole in which is driven a tube 16.
  • the bridge 12 has a hole in which is driven a stone 18, itself provided with a hole, coaxial with the tube 16.
  • the tube 16 and the stone 18 constitute the bearings of the wheel 14.
  • the bridge 12 further comprises a hole offset from the stone 18, in which is advantageously fixed by driving, a magnet 20 with axial magnetization.
  • This magnet 20 has a thickness substantially equal to that of the bridge 12. It is cylindrical in shape and of diameter substantially equal to that of the hole, so that it can be driven out there.
  • the wheel 14 has a shaft 22 and a solid board 24. Both the shaft 22, which carries a pinion, and the board 24, are made of steel. The board 24 is driven out and riveted onto the shaft 22.
  • the periphery of the board 24 has teeth 26.
  • the distance between the axis of the wheel 14 and the axis of the magnet 20 is such that the latter is located in line with the periphery of the wheel 14, but radially set back from the toothing 26 of this wheel 14.
  • Tests were carried out with watch movements fitted with a second hand which presented a positioning defect. This defect was due to the backlash and the rebound of the gear train at the end of the driving impulse. To eliminate this defect, these movements were transformed by providing them with a steel wheel and a magnet. chased into a hole in the bridge. More precisely, the seconds wheel, with a diameter of 2.2 mm and a thickness of 0.10 mm, is made of hardened Sandwik 14P steel (hardness 530 HV). This type of material has a coercive field substantially equal to 50 Oe and a residual induction close to 9000 G.
  • the magnet is made of platinum-cobalt, with a diameter equal to 0.30 mm, with a length equal to 0.50 mm, driven into the bridge, the distance between the axis of the wheel and the axis of the hole being equal to 0.82 mm.
  • the distance between the magnet and the wheel (the air gap) is 0.12 mm.
  • Another type of magnetic material can be chosen.
  • materials with a high coercive field anisotropic ferrites, cobalt platinum and materials based on rare earths, are best suited.
  • the magnet, the wheel and the distance between them will be chosen so that the steel in front of the magnet is close to saturation. Practical tests have shown that satisfactory results are obtained with a cylindrical magnet whose length is approximately twice its diameter, with a wheel whose thickness is substantially equal to the air gap, the latter being three to six times less. to the length of the magnet. These dimensional relationships are applicable if the magnet is platinum-cobalt. If another material is used, the dimensional ratios must be modified as a function of the characteristics of the material and more particularly of its coercive field and of its residual induction. More precisely, the length and the diameter can respectively be reduced with the increase in the coercive field and the residual induction.
  • platinum-cobalt is particularly well suited, despite its high cost. It has the advantage of not being sintered, hence a very high mechanical strength and machinability, which allows the magnet to be driven out without risk of breakage.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Suspension Of Electric Lines Or Cables (AREA)
  • Soft Magnetic Materials (AREA)
EP86113006A 1985-10-02 1986-09-20 Frein magnétique pour pièce d'horlogerie Expired EP0217251B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4248/85 1985-10-02
CH424885A CH661403GA3 (ja) 1985-10-02 1985-10-02

Publications (2)

Publication Number Publication Date
EP0217251A1 EP0217251A1 (fr) 1987-04-08
EP0217251B1 true EP0217251B1 (fr) 1989-06-21

Family

ID=4272560

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86113006A Expired EP0217251B1 (fr) 1985-10-02 1986-09-20 Frein magnétique pour pièce d'horlogerie

Country Status (6)

Country Link
US (1) US4684263A (ja)
EP (1) EP0217251B1 (ja)
JP (1) JPS6291886A (ja)
CH (1) CH661403GA3 (ja)
DE (1) DE3664069D1 (ja)
HK (1) HK86992A (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0187288U (ja) * 1987-12-02 1989-06-08
CH679823B5 (ja) * 1990-10-22 1992-10-30 Ebauchesfabrik Eta Ag
JP2646946B2 (ja) * 1992-12-02 1997-08-27 セイコーエプソン株式会社 時 計
US6804172B2 (en) * 2002-03-07 2004-10-12 Seiko Instruments Inc. Analog electronic timepiece including plural indicator wheels
EP2602674B1 (fr) * 2011-12-07 2014-06-25 ETA SA Manufacture Horlogère Suisse Dispositif d'affichage d'horlogerie à combinaison d'afficheurs
EP2672334A1 (fr) 2012-06-07 2013-12-11 Chopard Technologies SA Mécanisme horloger à réduction des jeux d'engrenage
CH707471B1 (fr) * 2013-08-05 2014-07-31 Rd Engineering Rudolf Dinger Système régulateur pour montre mécanique.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978654A (en) * 1973-06-07 1976-09-07 Kabushiki Kaisha Suwa Seikosha Motion transformer

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE410706C (de) * 1924-07-29 1925-03-05 Tavannes Watch Co Sa Triebwerk fuer einen mittelbar durch Zwischenraeder angetriebenen Sekundenzeiger
FR1276205A (fr) * 1960-12-14 1961-11-17 Junghans Geb Ag Dispositif destiné à empêcher les oscillations d'organes rotatifs dans les trains de transmission
JPS5982706A (ja) * 1982-11-02 1984-05-12 Citizen Watch Co Ltd 白金合金系複合材料磁石

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978654A (en) * 1973-06-07 1976-09-07 Kabushiki Kaisha Suwa Seikosha Motion transformer

Also Published As

Publication number Publication date
EP0217251A1 (fr) 1987-04-08
CH661403GA3 (ja) 1987-07-31
US4684263A (en) 1987-08-04
DE3664069D1 (en) 1989-07-27
JPS6291886A (ja) 1987-04-27
HK86992A (en) 1992-11-13

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