EP2060958A2 - Roue dentée, engrenage et mouvement horloger correspondants, pour pièce d'horlogerie - Google Patents

Roue dentée, engrenage et mouvement horloger correspondants, pour pièce d'horlogerie Download PDF

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Publication number
EP2060958A2
EP2060958A2 EP08019244A EP08019244A EP2060958A2 EP 2060958 A2 EP2060958 A2 EP 2060958A2 EP 08019244 A EP08019244 A EP 08019244A EP 08019244 A EP08019244 A EP 08019244A EP 2060958 A2 EP2060958 A2 EP 2060958A2
Authority
EP
European Patent Office
Prior art keywords
wheel
movement
chronograph
foot
gear
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.)
Withdrawn
Application number
EP08019244A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jean-Pierre Golay
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.)
Franck Mueller Watchland SA
Original Assignee
Franck Mueller Watchland 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 Franck Mueller Watchland SA filed Critical Franck Mueller Watchland SA
Publication of EP2060958A2 publication Critical patent/EP2060958A2/fr
Withdrawn legal-status Critical Current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
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • G04B13/027—Wheels; Pinions; Spindles; Pivots planar toothing: shape and design
    • 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
    • G04F7/0842—Watches or clocks with stop devices, e.g. chronograph with start-stop control mechanisms
    • G04F7/0847—Watches or clocks with stop devices, e.g. chronograph with start-stop control mechanisms with column wheel

Definitions

  • the present invention relates to a cogwheel gear for clockwork comprising a board provided with a toothing at its periphery, the toothing comprising a plurality of teeth each having a foot extending from the board and in the extension of which is provided a head having a width greater than that of the foot.
  • the invention also relates to a gear and a watch movement provided with such a toothed wheel, and a timepiece whose movement is provided with such a toothed wheel.
  • Gear wheels are commonly used in watch movements to fulfill various functions. In addition to its function, a large number of parameters relating to the use of a gear wheel influence the shape of its teeth, including its location in the kinematic chain of motion, the fact that it meshes permanently with another wheel or sequentially, the fact that there are sets of gears to limit or not, its dimensions relative to those of another wheel with which it is intended to be engaged, etc.
  • the patent application FR 2 867 543 A1 presents, in one of its embodiments, a particular type of toothed wheel meeting the definition given above. It emerges from this document that the profile of the tooth disclosed responds to specific needs, namely to allow meshing of the toothed wheel with cylinders carried at the periphery of a neighboring wheel and oriented along axes parallel to the axes of rotation of the wheels. , to constitute a lantern gear.
  • This movement comprises a clutch, acting during departures and stops of measurement time, comprising a rocker 100 mounted on the frame of the movement so as to be pivotable between two positions about an axis 101, depending on the angular position of a column wheel 102, to establish or interrupt a link kinematics between the finishing gear of the movement and a chronograph wheel.
  • a field wheel 103 or seconds wheel, is permanently driven from the movement finishing train and is arranged in engagement with a wheel performing the clutch return function 104.
  • the chronograph function In a first position of the rocker, namely that represented on the figure 1 , the chronograph function is stopped and the reference 104 rotates in the vacuum in that the rocker is supported on a column of the column wheel. When the column wheel turns one step, the rocker falls between two columns by turning clockwise on the figure 1 . The reference 104 then enters into engagement with a wheel of the chronograph train, typically the chronograph wheel 105, intended to drive a display member of the second of the measured times.
  • a wheel of the chronograph train typically the chronograph wheel 105
  • the teeth of the reference 104 and the chronograph wheel 105 have a triangular profile, as is apparent from the figure 1 , facilitating their meshing during the movement of the clutch rocker at the engagement of the chronograph.
  • the timepieces comprising a watch movement of the type just described have a disadvantage occurring during the time measurement activations, in that the rotational movement of the rocker 100 about the axis 101 at the moment the triggering of the chronograph, more particularly that of the clutch return 104, causes a parasitic movement of the chronograph wheel 105 when the clutch return contact with it.
  • the parasitic movement of the chronograph wheel causes a parasitic movement of the seconds display member that the wearer of the watch can detect, which is not very favorable for the image of the manufacturer, in terms of quality, especially in relation to a timepiece positioned in the high-end.
  • An object of the present invention is to overcome the disadvantages of the state of the art mentioned above, by proposing an alternating-shaped toothed wheel capable of cooperating with another gear, similar, in several relative positions associated with different values of the invention. between the two wheels.
  • the toothed wheel according to the invention is characterized in that the foot of each tooth is substantially straight, and that the head has a point, located on a radius of the board and from which extend , on either side of the radius, a first substantially rectilinear portion, to a distance of the radius greater than half a width of the foot, and a second portion, concave, joining the first portion to the foot.
  • the foot has a length equal to or greater than that of the head.
  • a gear comprising two wheels of this type arranged in engagement with each other and a mechanism for moving at least one of these wheels relative to the wheel. other, between at least a first operating position, in which the tooth heads of one wheel cooperate with the side walls of the feet of the teeth of the other wheel and, a second operating position, in which the heads of the teeth one wheel cooperate with the tooth heads of the other wheel.
  • Such a gear can be used, for example, in a watch movement having a chronograph function, to overcome the problems mentioned above. It is thus possible, by virtue of the particular characteristics of the gearwheel according to the invention, to provide a clutch comprising a clutch gear that moves, between two positions associated with the on and off states of the chronograph function, by following a substantially collinear direction to the line joining the axis of a field wheel, namely a wheel driven from the work train and with which the clutch gear is engaged, and the axis of a wheel of the chronograph wheel, intended to be driven via the clutch return.
  • the clutch return In its movement, the clutch return is moving away and is close to the field wheel while maintaining meshing with it when these two wheels have a structure according to the present invention.
  • the invention also relates to a timepiece comprising a movement according to the characteristics described above.
  • FIG. 1 represents a simplified plan view, on the bridge side, of a part of a movement for a timepiece of the state of the art
  • FIG. 2 represents a simplified plan view, on the dial side, of a part of a movement according to the present invention, in a first configuration
  • the figure 3 represents a simplified plan view similar to the view of the figure 2 the movement being visible in a second configuration
  • the figure 4a represents a simplified plan view of a construction detail of the movement of figures 2 and 3 , in the first configuration of the figure 2 ;
  • the figure 4b represents an enlarged detail of the figure 4a .
  • the figure 5 represents a simplified plan view of a construction detail of the movement of figures 2 and 3 , in the second configuration of the figure 3 .
  • FIG. 1 represents a simplified plan view, on the bridge side, of a part of a movement for a timepiece known from the state of the art having a chronograph function
  • the figures 2 and 3 are simplified plan views, on the dial side, of a portion of a chronograph function movement 1 according to the present invention, respectively in a first and a second configuration.
  • This movement 1 comprises frame elements including a plate 2, on which are mounted mobiles, levers, scales and other conventional watch components which will not be described in detail in this presentation to the extent that most of them only shows a distant relationship with the present invention.
  • the watch movement is of the column wheel chronograph type 3.
  • the latter can be rotated on itself by a hook 4, integral with a control 5 whose displacements can be controlled, conventionally, from a pusher (not shown).
  • Each press on the pusher causes a rotation of one step of the column wheel 3, changing the chronograph function from an active state to a stopped state and vice versa.
  • the alternation of solids (the columns) and empty acts on different latches 6, 7 movable between two positions to allow the driving of a chronograph wheel, including the chronograph wheel 8, from a finishing gear (not shown).
  • the column wheel 3 also cooperates with a lever 10, acting on a blocker 11 whose function is, in a conventional manner, to maintain fixed the angular position of the chronograph wheel 8 when the measurement of a time is interrupted, as well as with hammers of reset hammers 12 and 13, triggered elsewhere.
  • the column wheel locks the activation of the reset hammers when the measurement of a time is in progress.
  • the figure 2 represents the movement when the chronograph function is stopped, while the reset hammers 12 and 13 are lowered to position the display members of the measured times to zero, while the figure 3 represents this same movement while the measurement of a time is in progress.
  • the movement comprises a second wheel 15, rotatably mounted on the plate 2 being preferably secured to the mobile seconds (not visible) of the gear train of the movement.
  • the seconds wheel 15 is arranged permanently engaged with a wheel 16 carried by the clutch rocker 6 and acting as a clutch return.
  • the clutch rocker 6 is pivotally mounted on the plate 2, by means of a span screw 17, being held in a first position, disengaged, corresponding to the position represented on the figure 2 by the action of a clutch spring 18.
  • the disengaged position is identified and adjusted by means of a first eccentric 19 defining a first stop for the clutch rocker.
  • a pressure of a user on the pusher of the corresponding timepiece causes a rotation of a pitch of the column wheel 3 (in the clockwise direction in the figures) which then raises the clutch rocker 6 for the bring into a second position, engaged, as shown on the figure 3 .
  • the clutch rocker rotates counter-clockwise to bring the clutch gear 16 into engagement with the chronograph wheel 8.
  • the penetration of the gear teeth of the clutch gear into the gearing of the chronograph wheel can be adjusted by means of a second eccentric 20 mounted on the plate.
  • the clutch return does not turn around the seconds wheel to move from the disengaged position to the engaged position, and vice versa, but it deviates and s' bring it closer.
  • FIGS. 4a and 5 represent the relative positions between the seconds wheel 15, the clutch return 16 and the chronograph wheel 8, respectively, in the disengaged position and in the engaged position. Note the particular arrangement of these wheels whose respective axes of rotation are arranged to be substantially aligned, the clutch return being located between the two wheels to be kinematically connected.
  • the figure 4b represents an enlarged view of the structure of the teeth on which certain details which will be described are better visible.
  • the chronograph wheel 8 has a toothing whose teeth have a conventional triangular profile.
  • the seconds wheel 15 and the clutch return 16 comprise teeth whose teeth 25, 26 have the same particular profile, these teeth being arranged on the periphery of the wheel board 27, 28 corresponding.
  • Each of the teeth 25 and 26 comprises a foot 251, 261 whose width is less than the maximum width of the corresponding head 252, 262, the length of the foot being also substantially greater than that of the head. Because of this, and because the space between two adjacent heads of one wheel is necessarily greater than the width of one head of the other wheel to limit friction during operation of the gear, the hollow of the toothing, that is to say, the space 253, 263 located between two adjacent feet of a wheel, has dimensions generally greater than the dimensions of a head of the other wheel.
  • the space 253, 263 located between two adjacent feet of a wheel has a substantially constant width from the head 252, 262 to the bottom of the toothing.
  • the foot 251, 261 of each tooth 25, 26 has a substantially elongate shape, rectangular.
  • the head 252, 262, symmetrical with respect to a radius R of the corresponding wheel, has, from its free end, a tip 254, 264, situated on the aforementioned spoke and, from which a first portion 255, 265, substantially rectilinear, extends in the direction of the corresponding board, to a distance from the radius greater than half the width of the corresponding foot.
  • Each head 252, 262 comprises a second portion 256, 266 curved ensuring the junction between the first portion 255, 265 and the foot 251, 261.
  • each head 252, 262 has a profile similar to that of a conventional triangular tooth in its region between its point 254, 264 and its second portion 256, 266. In the embodiment described here for example, this last feature ensures good meshing between the clutch return 16 and the chronograph wheel 8.
  • the figure 4a represents the relative position of these two wheels in the disengaged position of the clutch rocker 6, corresponding to the view of the figure 2 .
  • the two wheels 15 and 16 are brought together, the wheel 16 being out of reach of the chronograph wheel 8.
  • a tooth of one of the wheels 15, 16 which cooperates with the toothing of the other wheel penetrates almost completely into the space 253, 263 located between two teeth.
  • the meshing then occurs by the interaction of the head of this tooth with the side wall (the one located downstream with reference to the direction of rotation of the teeth) of a foot of the other toothing.
  • the meshing between the clutch return 16 and the chronograph wheel 8 is achieved by means of the heads 262, which have a profile similar to that of the teeth of the state of the art, the number of teeth of the wheel chronograph being greater than that of the clutch return, in a conventional manner.
  • the toothing is a set of teeth.
  • two wheels according to the invention may be arranged in engagement while being coaxial with a variable distance between them.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
  • Gear Transmission (AREA)
  • Gears, Cams (AREA)
EP08019244A 2007-11-14 2008-11-04 Roue dentée, engrenage et mouvement horloger correspondants, pour pièce d'horlogerie Withdrawn EP2060958A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH01762/07A CH704637B1 (fr) 2007-11-14 2007-11-14 Roue dentée, engrenage, mouvement horloger et pièce d'horlogerie correspondants.

Publications (1)

Publication Number Publication Date
EP2060958A2 true EP2060958A2 (fr) 2009-05-20

Family

ID=40010520

Family Applications (1)

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EP08019244A Withdrawn EP2060958A2 (fr) 2007-11-14 2008-11-04 Roue dentée, engrenage et mouvement horloger correspondants, pour pièce d'horlogerie

Country Status (6)

Country Link
US (1) US20090122655A1 (ru)
EP (1) EP2060958A2 (ru)
JP (1) JP2009122107A (ru)
CN (1) CN101470401A (ru)
CH (1) CH704637B1 (ru)
RU (1) RU2008144899A (ru)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2957964A2 (fr) 2014-06-19 2015-12-23 Société anonyme de la Manufacture d'Horlogerie Audemars Piguet & Cie Dispositif d'embrayage basculant pour pièce d'horlogerie

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102236317B (zh) * 2010-04-30 2013-02-13 天津海鸥表业集团有限公司 一种手表的指示机构
CH704775A2 (fr) * 2011-04-08 2012-10-15 Richemont Int Sa Mécanisme de chronographe.
EP3324249A1 (fr) * 2016-11-17 2018-05-23 Nogerah SA Systeme d'embrayage pour chronographe

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1437633A1 (fr) 2003-01-08 2004-07-14 Patek Philippe S.A. Rouage de chronographe
FR2867543A1 (fr) 2004-03-12 2005-09-16 Centre Nat Rech Scient Engrenage a lanterne

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
US441460A (en) * 1890-11-25 Gear-wheel
US515137A (en) * 1894-02-20 Gear-wheel and method of making same
US2172545A (en) * 1937-06-21 1939-09-12 Nat Broach & Mach Method of making rotary gear cutters
US3206996A (en) * 1961-12-27 1965-09-21 Speicher Brothers Inc Drive gear construction
DE3206946C2 (de) * 1982-02-26 1985-08-08 Timex Corp., Waterbury, Conn. Schaltgetriebe für Geräte der Zeitmeßtechnik
US20030083166A1 (en) * 2000-05-10 2003-05-01 Jeff A. Greene Multilayered flexible drive sprocket
US6571655B2 (en) * 2001-07-26 2003-06-03 Juken Kogyo Co., Ltd. Involute gear pair structure
US6902507B2 (en) * 2002-04-11 2005-06-07 Richard N. Ballard Roller cam assembly
EP1555584A1 (fr) * 2004-01-13 2005-07-20 Rolex S.A. Mobile denté à rattrapage de jeu, engrenage et utilisation de cet engrenage
JP4618806B2 (ja) * 2006-07-31 2011-01-26 株式会社エンプラス 歯車

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1437633A1 (fr) 2003-01-08 2004-07-14 Patek Philippe S.A. Rouage de chronographe
FR2867543A1 (fr) 2004-03-12 2005-09-16 Centre Nat Rech Scient Engrenage a lanterne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
C.-A. REYMONDIN ET AL.: "Théorie d'horlogerie", FÉDÉRATION DES ECOLES TECHNIQUES, pages: 234

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2957964A2 (fr) 2014-06-19 2015-12-23 Société anonyme de la Manufacture d'Horlogerie Audemars Piguet & Cie Dispositif d'embrayage basculant pour pièce d'horlogerie
US9411316B2 (en) 2014-06-19 2016-08-09 Société Anonyme de la Manufacture d'Horlogerie Audemars Piguet & Cie Tilting coupling device for timepiece

Also Published As

Publication number Publication date
RU2008144899A (ru) 2010-05-20
JP2009122107A (ja) 2009-06-04
CN101470401A (zh) 2009-07-01
CH704637B1 (fr) 2012-09-28
US20090122655A1 (en) 2009-05-14

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