EP0482443A1 - Bremsungsvorrichtung für ein Zahnrad - Google Patents

Bremsungsvorrichtung für ein Zahnrad Download PDF

Info

Publication number
EP0482443A1
EP0482443A1 EP91117333A EP91117333A EP0482443A1 EP 0482443 A1 EP0482443 A1 EP 0482443A1 EP 91117333 A EP91117333 A EP 91117333A EP 91117333 A EP91117333 A EP 91117333A EP 0482443 A1 EP0482443 A1 EP 0482443A1
Authority
EP
European Patent Office
Prior art keywords
wheel
brake element
braking device
gear
clutch
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
EP91117333A
Other languages
English (en)
French (fr)
Other versions
EP0482443B1 (de
Inventor
Cyril Vuilleumier
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
Ebauchesfabrik ETA AG
Original Assignee
Ebauchesfabrik ETA AG
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 Ebauchesfabrik ETA AG, Eta SA Fabriques dEbauches filed Critical Ebauchesfabrik ETA AG
Publication of EP0482443A1 publication Critical patent/EP0482443A1/de
Application granted granted Critical
Publication of EP0482443B1 publication Critical patent/EP0482443B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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
    • G04B11/00—Click devices; Stop clicks; Clutches
    • G04B11/001—Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power
    • G04B11/003—Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power with friction member, e.g. with spring action
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
    • G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
    • G04F7/08—Watches or clocks with stop devices, e.g. chronograph
    • G04F7/0823—Watches or clocks with stop devices, e.g. chronograph with couplings between the chronograph mechanism and the base movement
    • G04F7/0833—Watches or clocks with stop devices, e.g. chronograph with couplings between the chronograph mechanism and the base movement acting perpendicular to the plane of the movement

Definitions

  • the present invention relates to a device for braking a wheel of a gear.
  • gear fractions are necessary, on the one hand, because of the manufacturing tolerances, and on the other hand, because they prevent the two wheels from jamming during their rotation.
  • the driven wheel sometimes turns by jerks. This is even more accentuated when it is the last wheel of a gear train which comprises several.
  • this problem is crucial insofar as the user of a watch can perceive that one of the hands advances in spurts. This can be the case for example for the seconds hand when it is fixed on the last wheel of a gear train. If it is a watch without complications, the user has the impression that the seconds wheel turns irregularly and if it is a chronograph watch that the time displayed is imprecise.
  • this type of friction device can only be used if the wheel to be braked is located directly above the bridge, and provided that there is sufficient space between this wheel and the bridge to place it these measures. Sometimes, however, the wheel to be braked is itself placed over one or more other gear wheels. It is then impossible to use the device mentioned above.
  • Braking devices which use magnetism.
  • a magnet generally made of platinum-cobalt is fixed, for example, in the bridge placed above the wheel to be braked. Under the action of this magnet, the wheel is attracted towards this bridge and its axis rubs on the bearing located in this bridge, which has the effect of braking the wheel.
  • the object of the invention is to remedy the drawbacks mentioned above of the prior art by providing a device for braking a gear wheel which is inexpensive and can be adapted to any type of gear.
  • the subject of the present invention is a device for braking a wheel of a gear comprising at least two mobiles, a first mobile comprising a toothed wheel pivoting about an axis and meshing with a second mobile comprising a second gear wheel pivoting about a second axis, parallel to said first axis.
  • This braking device comprises an elastic element forming a brake which is arranged coaxially with the first mobile.
  • the brake element is associated with said first mobile so as to be driven in rotation by the latter
  • this brake element has at its periphery a friction surface and thirdly, the axial position of said brake element relative to said first axis is chosen relative to the axial position of the second wheel, so that, in the engagement zone of the mobiles, the corresponding part of said friction surface is in elastic support against one of the faces of said second wheel, so as to brake the latter.
  • the brake element can be placed directly on the first mobile and fix this element thereon. It is no longer necessary to provide a fixing on the deck.
  • the brake element has, in the free state, the shape of a washer curved along one of its diametrical axes and the cavity of which is directed towards the first toothed wheel on which it is fixed.
  • this washer forms a spring and makes it possible to increase the friction force exerted by the friction surface on the second wheel, which must be braked.
  • the brake element is preferably made of brass.
  • a braking device is produced which is inexpensive to manufacture.
  • the braking device 1 is used in a gear train, intended in particular to equip a timepiece such as a chronograph.
  • This gear train comprises at least two mobiles, namely a first mobile 2 comprising a toothed wheel 3 pivoting about an axis 5 and meshing with a second mobile 6 comprising a toothed wheel 7 pivoting itself around an axis 9 parallel to the first axis 5.
  • the braking device 1 is associated with the first wheel 3, which is here a driving wheel and it makes it possible to brake the second wheel 7 which is driven.
  • this braking device could also be associated with the driven wheel and act on the driving wheel, provided that the driven wheel has a sufficiently large diameter and that the driving wheel is sufficiently thick to avoid deformation under the action of said brake element.
  • the second wheel 7 is a chronograph wheel and the axis 9 carries the chronograph hand 11, while the first wheel 3 is a clutch.
  • the two wheels 3 and 7 are conventionally arranged between a bridge 13 and a plate 15.
  • the axle 5 is held between an upper bearing 17 mounted in the bridge 13 and a lower bearing 19 mounted in the plate 15.
  • the wheel d clutch 3 is arranged around a clutch core 21 provided with an axial bore 23 provided for the passage of the first axis 5.
  • This clutch core could also be the hub of the wheel in the case of a simple gear wheel.
  • this clutch core 21 comprises an annular groove 25 in which the arms of a clutch fork 27 engage.
  • a clutch ring 29 around the core d clutch 21 and under the wheel 3 is mounted a clutch ring 29.
  • a third wheel 31 called the intermediate wheel is mounted on the axle 5 and under the ring 29.
  • This intermediate wheel 31 is driven by a fourth wheel, generally a seconds wheel, (not shown in Figure 1).
  • the braking device 1 is precisely used to prevent this.
  • the braking device comprises a member 1 forming a brake arranged coaxially with the clutch gear 3 so as to be driven in rotation by the latter.
  • the brake element 1 is provided with a central circular opening 37 (see also FIG. 3) and is held around the clutch core 21 under the clutch wheel 3.
  • the brake element When in the free state, the brake element takes the form of a washer curved along one of its diametrical axes, but when it is in place (see Figure 1), it has the form of '' a slightly deformed disc whose diameter D 1 is equal to or greater than the total diameter D 2 (diameter of the circumference of the top of the teeth) of the clutch wheel 3, so as to define at the periphery of this element 1 a surface annular friction 39 (see Figure 2). In this figure, the brake element 1 projects beyond the periphery of the wheel 3 in order to better produce the annular friction surface 39. However, this element 1 could be of the same diameter as the wheel 3.
  • the periphery of the brake element is pressed against the wheel 3, the board of which is practically in contact with the entire surface of the washer 1.
  • the friction surface 39 is in contact with part of the periphery of the lower face of the chronograph wheel 7 and brakes it by friction. It is thus ensured that the wheel 7 always performs equal angular steps during the running of the chronograph.
  • the friction surface 39 is continuous, in order to ensure regular friction, it could possibly be discontinuous.
  • FIG. 3 illustrates the various parts before their assembly in the assembly represented in FIGS. 1 and 2.
  • the brake element 1 has, in the free state, the shape of a washer curved along one of its diametrical axes here, the DD axis.
  • This washer is made of an elastic material, preferably brass for cost reasons, but it could also be made of another elastic material. Its concavity is turned towards the clutch wheel 3. On the other hand, when it is in place, this washer is placed under stress between the ring 29 and the wheel 3, by being arbouted by its peripheral friction surface 39 on the surface of the wheel 7. Thus, regular friction is obtained and therefore good braking of the chronograph wheel 7.
  • FIG. 4 shows another embodiment of the invention.
  • the brake element is made from an elastic washer whose concavity is turned towards the wheel 3, and which is kept pressed against this wheel
  • the brake element of Figure 4 is a disc 1A which is mounted freely around the clutch core 21 while being integral in rotation with the latter. This disc is therefore no longer pressed against the wheel 3.
  • an adjustment ring 41 forming a spacer is mounted between the clutch wheel 3 and the disc 1A.
  • the thickness of this ring is chosen as a function of the difference in level between the faces of the wheels 3 and 7.
  • the axial position of the brake element 1 is chosen as a function of the axial position of the second wheel 7 so that in the engagement zone 43 of the wheels 3 and 7, the corresponding part of the friction surface 39 is in elastic abutment against one of the faces of said second wheel 7.
  • the braking device is described in its application to a chronograph mechanism, in which the ring 29 plays both, the role of the clutch ring and of the member holding the brake element in place.
  • the invention is not limited to this particular application.
  • it can be used advantageously in all cases where in a gear (of a simple watch, for example), it is desirable to apply a braking force to one of the wheels in order to compensate for the frolicking of gear.
  • the brake element will be simply mounted around the axis of one of the wheels while being held against the latter by a simple fixing ring.
  • FIG. 5 represents yet another embodiment of the invention in which the braking device comprises a brake element 1 B made from a ring fixed to one of the faces of the first wheel 3 by appropriate means , such as by gluing, for example.
  • This ring 1 B is coaxial with the wheel 3 and has a friction surface 39 at its periphery.
  • the external diameter D ' i of this ring 1 B is by means equal to the diameter D' 2 of the wheel 3 on which it is fixed.
  • Such an embodiment will preferably be used in clocks for example, having gear wheels with a diameter greater than that of the wheels usually used in a watch.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
  • Braking Arrangements (AREA)
  • Gear Transmission (AREA)
  • Electromechanical Clocks (AREA)
  • Gears, Cams (AREA)
EP91117333A 1990-10-22 1991-10-11 Bremsungsvorrichtung für ein Zahnrad Expired - Lifetime EP0482443B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3363/90 1990-10-22
CH3363/90A CH679823B5 (de) 1990-10-22 1990-10-22

Publications (2)

Publication Number Publication Date
EP0482443A1 true EP0482443A1 (de) 1992-04-29
EP0482443B1 EP0482443B1 (de) 1994-07-13

Family

ID=4254360

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91117333A Expired - Lifetime EP0482443B1 (de) 1990-10-22 1991-10-11 Bremsungsvorrichtung für ein Zahnrad

Country Status (5)

Country Link
US (1) US5253231A (de)
EP (1) EP0482443B1 (de)
JP (1) JP3105595B2 (de)
CH (1) CH679823B5 (de)
DE (1) DE69102854T2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2053474A1 (de) 2007-10-22 2009-04-29 Omega SA Chronographenuhr
EP3158401A1 (de) * 2014-06-19 2017-04-26 Rolex S.A. Zeitmesserübertragungsvorrichtung
EP2508953A3 (de) * 2011-04-08 2017-10-04 Montblanc Montre SA Chronographenmechanismus
EP3709104A1 (de) 2019-03-01 2020-09-16 Rolex Sa Zahnradgetriebe eines uhrwerks

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2995675B2 (ja) * 1996-10-11 1999-12-27 セイコーインスツルメンツ株式会社 アラーム付き電子時計
JP4658547B2 (ja) * 2004-09-13 2011-03-23 シチズンホールディングス株式会社 クロノグラフ機能付電子時計
JP6011993B2 (ja) * 2012-04-18 2016-10-25 カシオ計算機株式会社 情報表示装置および電子時計
KR101293497B1 (ko) * 2012-05-10 2013-08-07 전자부품연구원 1축 관절 모듈
KR101359959B1 (ko) * 2012-05-10 2014-02-12 전자부품연구원 치형 브레이크를 갖는 브레이크 장치 및 그를 이용한 모터 조립체
EP2860591A1 (de) * 2013-10-09 2015-04-15 Nivarox-FAR S.A. Montagesystem, bei dem ein konisches elastisches Blockierelement verwendet wird

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1344794A (fr) * 1963-01-22 1963-11-29 Dispositif notamment pour chronographe, ainsi que les chronographes munis de ce dispositif ou dispositif similaire
FR2030436A1 (de) * 1969-02-12 1970-11-13 Citizen Watch Co Ltd
US3695033A (en) * 1970-06-09 1972-10-03 Suwa Seikosha Kk Controlling device for an escape wheel
DE8436089U1 (de) * 1984-12-10 1985-03-07 Pforzheimer Uhren-Rohwerke Porta GmbH, 7530 Pforzheim Friktionsverbindung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6805821U (de) * 1968-11-07 1969-03-20 Diehl Nuernberg Fa Zeitschaltuhr zur zeitlichen steuerung der funktionen von geraeten, insbesondere kochherden.
CH661403GA3 (de) * 1985-10-02 1987-07-31
US4794576A (en) * 1988-01-29 1988-12-27 Timex Corporation Combination electrical contact member and braking member for a timepiece

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1344794A (fr) * 1963-01-22 1963-11-29 Dispositif notamment pour chronographe, ainsi que les chronographes munis de ce dispositif ou dispositif similaire
FR2030436A1 (de) * 1969-02-12 1970-11-13 Citizen Watch Co Ltd
US3695033A (en) * 1970-06-09 1972-10-03 Suwa Seikosha Kk Controlling device for an escape wheel
DE8436089U1 (de) * 1984-12-10 1985-03-07 Pforzheimer Uhren-Rohwerke Porta GmbH, 7530 Pforzheim Friktionsverbindung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2053474A1 (de) 2007-10-22 2009-04-29 Omega SA Chronographenuhr
US8002459B2 (en) 2007-10-22 2011-08-23 Omega S.A. Chronograph watch
EP2508953A3 (de) * 2011-04-08 2017-10-04 Montblanc Montre SA Chronographenmechanismus
EP3158401A1 (de) * 2014-06-19 2017-04-26 Rolex S.A. Zeitmesserübertragungsvorrichtung
EP3709104A1 (de) 2019-03-01 2020-09-16 Rolex Sa Zahnradgetriebe eines uhrwerks

Also Published As

Publication number Publication date
DE69102854D1 (de) 1994-08-18
JP3105595B2 (ja) 2000-11-06
JPH05157857A (ja) 1993-06-25
CH679823B5 (de) 1992-10-30
EP0482443B1 (de) 1994-07-13
CH679823GA3 (de) 1992-04-30
DE69102854T2 (de) 1995-02-23
US5253231A (en) 1993-10-12

Similar Documents

Publication Publication Date Title
EP1738229B1 (de) Krone für eine uhr mit einer entriegelungseinrichtung
EP1960847B1 (de) Uhrwerk eines zeitchronografen
EP0482443B1 (de) Bremsungsvorrichtung für ein Zahnrad
EP1431845A1 (de) Uhrgehäuse
EP0686897A1 (de) Uhrengehäuse mit verdrehbarem Glasreif
EP1857892A1 (de) Uhr mit einem drehbaren Teil
EP0722542B1 (de) Schwimmsattel- scheibenbremse und stift dafür
CH704250B1 (fr) Mécanisme de transmission de mouvements axiaux et rotatifs entre deux axes décalés et pièce d'horlogerie comportant un tel mécanisme.
EP1923754A1 (de) Mit einem Anzeigemodul ausgerüstetes Uhrwerk
EP1960843B1 (de) Uhrwerk
CH633273A5 (de) Verfahren zur herstellung von 2-brom-6-fluor-n-2-imidazolidinyliden-benzamin und dessen saeureadditionssalzen.
EP2075652A1 (de) Antriebs- und Übertragungsorgan für einen Hemmungsmechanimus, damit ausgestattete Platte und Hemmung und mit diesen ausgestattetes Uhrwerk
EP1960848B1 (de) Hammer einer uhr
EP1960846B1 (de) Uhrwerk
EP0568499A1 (de) Vorrichtung zur Anzeige der Gangreserve einer Uhr
EP2765463B1 (de) Mechanismus zur Übertragung von Achsen- und Drehbewegungen zwischen zwei verschobenen Achsen, und Uhr, die mit einem solchen Mechanismus ausgestattet ist
EP0370356A1 (de) Uhrengehäuse mit einem gesinterten Mittelteil
EP0770937A1 (de) Uhr mit einem drehbaren Ring
EP1217470B1 (de) Vorrichtung zur Anzeige einer numerischen Information mit zwei Ziffern
CH719351A1 (fr) Pièce d'horlogerie avec dispositif de sélection pour mécanisme de fonction auxilaire et automate comprenant une telle pièce.
EP4123391A1 (de) Uhrenkomponente zur befestigung auf einer welle und verfahren
WO2021228938A1 (fr) Boite de montre comprenant un élément tournant
CH682872B5 (fr) Mouvement d'horlogerie comportant des moyens de guidage d'un organe de commande, tel qu'une tige.
FR2783294A1 (fr) Synchroniseur simple pour boite de vitesses notamment de vehicule automobile
CH718371A2 (fr) Montre munie d'un dispositif de verrouillage d'un organe de commande extérieur.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19920516

17Q First examination report despatched

Effective date: 19931208

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 69102854

Country of ref document: DE

Date of ref document: 19940818

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19940921

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20021028

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20030929

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20030930

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040630

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20041011

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050503

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20041011