EP3542226A1 - Systeme d'embrayage pour chronographe - Google Patents
Systeme d'embrayage pour chronographeInfo
- Publication number
- EP3542226A1 EP3542226A1 EP17804126.5A EP17804126A EP3542226A1 EP 3542226 A1 EP3542226 A1 EP 3542226A1 EP 17804126 A EP17804126 A EP 17804126A EP 3542226 A1 EP3542226 A1 EP 3542226A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mobile
- wheel
- safety
- output
- teeth
- 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
Links
- 230000008878 coupling Effects 0.000 title abstract 2
- 238000010168 coupling process Methods 0.000 title abstract 2
- 238000005859 coupling reaction Methods 0.000 title abstract 2
- 230000007246 mechanism Effects 0.000 claims abstract description 9
- 230000035939 shock Effects 0.000 claims description 9
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- 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
- G04F7/0828—Watches or clocks with stop devices, e.g. chronograph with couplings between the chronograph mechanism and the base movement acting in the plane of the movement
-
- 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
- G04F7/0804—Watches or clocks with stop devices, e.g. chronograph with reset mechanisms
Definitions
- the present invention relates to the field of watchmaking. It relates more particularly to a clutch system for a chronograph mechanism.
- the clutches commonly used in chronographs are typically of two types, namely horizontal clutches and vertical clutches.
- an intermediate mobile is pivotally mounted in the plane of movement to kinematically connect a mobile input, driving, and an output mobile, led.
- the input mobile is typically the field wheel, integral in rotation with the seconds mobile of the watch movement
- the output mobile is typically the chronograph wheel, integral in rotation with the seconds hand of the chronograph.
- the mobile input and the output mobile are kinematically connected (engaged state), or this connection is broken because the intermediate mobile is out of reach the mobile output (disengaged state).
- the position of the rocker is typically controlled via a column wheel, a shuttle, a cam or similar control means.
- This kind of clutch is thin and can build relatively thin chronograph mechanisms.
- e mobile intermediate and the output mobile each have a toothing, the tolerances necessary for the proper functioning of the clutch generate a gearing.
- This frolicking can cause wriggling of the associated display member, in the absence of other compensation measures such as the deliberate introduction of friction in the system, for example by means of a friction spring.
- the intermediate mobile In order to minimize the probability that this jump takes place and to reduce its amplitude when it arrives, the intermediate mobile typically has a pointed triangular toothing, the output mobile also having the same type of teeth, but even thinner.
- the pitch of the toothing of the output mobile is for example half or a third of that of the intermediate mobile.
- the vertical clutch In order to prevent the seconds hand of the chronograph from inadvertently jumping as described above, the vertical clutch has been proposed.
- this type of clutch the kinematic connection between the input and output mobiles is effected by means of a pair of friction discs, which are coaxial and which are subjected to a restoring force tending to bring them into contact with each other. mutually by one of their plane faces.
- the torque In the engaged state, the torque is transmitted between the input mobile and the output mobile by friction between these friction discs.
- This frictional kinematic connection eliminates any clutch gearing.
- a clamp typically controlled by a column wheel, separates the friction discs via wedge surfaces that interpose between said discs. By removing these wedges, the friction discs fall back on one another, and the kinematic link is restored.
- This construction is nevertheless very complex, and is not compatible with standard movements, thus requiring a dedicated construction.
- the object of the invention is therefore to provide a chronograph clutch system in which the aforementioned disadvantages are at least partially overcome.
- the invention relates to a clutch system for a chronograph mechanism, as defined by the independent claim.
- This system comprises an input mobile intended to be driven by a motor member, such as a cylinder, a motor or the like, an output mobile intended to drive at least one display member such as a second hand of chronograph, as well as an intermediate mobile.
- This intermediate mobile is in permanent kinematic connection with a first mobile selected from said mobile input and said mobile output, typically the mobile input, but the reverse arrangement is also possible.
- the intermediate mobile is mounted so that it can move between an engaged state in which said input mobile is in kinematic connection with said output mobile and the chronograph operates, and a disengaged state in which said kinematic link is broken and the chronograph is stopped.
- the clutch further comprises a first friction wheel integral in rotation of said intermediate mobile, and a second friction wheel integral in rotation with a second mobile selected from said mobile input and said mobile. output, the second mobile being the mobile opposite said first mobile, typically the mobile output.
- These friction wheels are at least partially coplanar, that is to say that they are at least partially in the same plane, and are arranged to transmit a rotation between said intermediate mobile and said second mobile, or conversely according to the chosen arrangement, when said intermediate mobile, and therefore said clutch system, is in engaged state.
- the clutch further comprises a first security wheel integral in rotation of the intermediate mobile, which comprises a first safety toothing, and a second security wheel secured in rotation to said second mobile, which comprises a second safety toothing. These safety teeth are shaped to interpenetrate each other when said intermediate mobile is in engaged state.
- the clutch system of the invention can be easily integrated into a standard movement, without (or with little) modification.
- the intermediate mobile is pivotally mounted on a rocker controlled by an elastic member.
- an elastic element to control the rocker makes it possible to predetermine the contact force between the friction wheels, and thus to optimize it.
- the elastic element is carried by a control lever, which may, for example, be controlled by a control member such as a column wheel, a shuttle or a cam, and which comprises arranged stops so as to prevent the intermediate mobile (and thus the clutch system) from changing state during an impact.
- the control lever thus defines a limit of displacement of the intermediate wheel in each of its states, which prevents unwanted angular displacements of the mobile output in disengaged state, and avoids breaking the kinematic link when the intermediate mobile is in engaged state.
- the elastic element comprises a free end which interacts with said latch to control it, said stops being located on either side of the free end. Therefore, in case of shock, the free end of the elastic element, which may for example take the form of a fork, comes into contact with one of these stops. A simple and compact arrangement is thus proposed.
- one of said stops is arranged to prevent said intermediate mobile and said second mobile interact during an impact when said intermediate mobile is in its disengaged state, the other of said stops being arranged to prevent said safety teeth can move out of range of each other during an impact when said system is in its engaged state.
- the system may further comprise a reference meshing on the one hand with said first mobile and on the other hand with said intermediate mobile.
- This referral may, if necessary, include teeth to catch play.
- the safety teeth comprise each tooth having a width of at most one quarter, preferably at most one fifth, of the pitch of said toothing, measured at the maximum depth of interpenetration of said safety toothing. .
- the probability that the teeth will abut against each other when the chronograph is turned on is thus reduced, and the size of the jump, if there is to be one, is minimized since the safety teeth are relatively thin. .
- Said first mobile may be said mobile input and said second mobile may be said mobile output.
- the upstream sides of the first safety wheel and the downstream flanks of the second safety wheel are curved. Therefore, in the case where a tooth of the first safety wheel abuts against a tooth of the second safety wheel, a slight further acceleration of the second wheel can occur before the kinematic friction connection is established. This acceleration is less visible for a user than a jump.
- the first mobile is the mobile output and the second mobile is the mobile input
- the upstream sides of the second safety wheel, and the downstream flanks of the first safety wheel can be curved with the same effect.
- the invention also relates to a watch movement comprising a chronograph mechanism provided with a clutch system as described above, as well as a timepiece comprising such a movement.
- FIG. 1 is an isometric view of a clutch system according to the invention in the disengaged state
- FIG. 2 is an isometric view of the clutch system of Figure 1 in the engaged state
- FIG. 3 is a plan view of the intermediate mobile and the output mobile of the system of FIG. 1, viewed from below with respect to the orientation of FIG. 1.
- FIGS 1 and 2 illustrate a clutch system 1 for chronograph according to the invention, in the disengaged state respectively engaged.
- the system 1, of horizontal type comprises an input mobile 3, arranged to be driven by a basic movement (not shown) that includes the timepiece in which the system 1 is integrated .
- the input mobile 3 may, for example, be integral in rotation with the mobile seconds of said movement, or driven by the latter.
- another suitable mobile may be used for the same purpose.
- the input mobile 3 is selectively kinematic link with an output mobile 5, which is a second chronograph mobile in this case, and which also carries a reset cam 7.
- This selective kinematic connection is effected by the intervention of a first intermediate mobile 9, mounted free to rotate on a rocker January 1 and in permanent kinematic connection with the mobile input 3.
- This rocker January 1 also carries a referral 13 which meshes permanently on the one hand with the mobile input 3, and on the other hand with a toothing 15 that includes the intermediate mobile 9.
- a pivoting of the rocker can establish or break a kinematic connection between the first intermediate mobile 9 and the mobile output 5.
- the engaged state respectively disengaged from the intermediate mobile 9 thus determines the corresponding state of the system of clutch 1.
- the first intermediate mobile 9 can be in permanent kinematic connection with the output mobile 5, through the reference 13 in a similar manner to the first variant, a pivoting of the rocker thus causing the first intermediate mobile 9 in kinematic connection with the mobile input.
- the description which follows deals with the first of these variants, as illustrated in the figures; the modifications to implement the second variant are within the reach of those skilled in the art and should not be described in detail.
- the reference 13 comprises a set of teeth to catch slack teeth, but a conventional wheel is also possible. It is also conceivable to provide only one intermediate mobile 9, thus meshing directly with the mobile input 3.
- the latch 1 1 is pivotally mounted about the same axis of rotation as the mobile input, but a slight offset between the axes of rotation of these elements is admissible.
- the intermediate mobile 9 comprises a first friction wheel 17, which is arranged to come into contact with a second friction wheel 19 that
- the friction wheel materials and their finish can be selected according to the needs of the watchmaker to ensure torque transmission with an appropriate contact force.
- This contact force is provided by an elastic member 21, which also controls the flip-flop 1 1, as will appear more clearly later.
- the elastic element 21 is a leaf spring carried by a control lever 25, pivotally mounted about an axis of rotation 29 and subjected to a restoring force via an elastic return element 31 which tends to rotate it counterclockwise (depending on the orientation of the figures), and maintaining its tail 33 in contact with the column wheel 27.
- the latter controls the control lever 25 in a conventional manner.
- the control lever 25 may be controlled by a shuttle system, a cam, or a similar system.
- the free end of the elastic element 21 comprises a fork 35, which interacts with a pin 23 located at an end remote from the pivot axis 29 of the control lever 25.
- the elastic member applies a force that rotates the lever 1 1 in the counterclockwise direction.
- the friction wheels 17, 19 therefore come into contact with each other, and the mobile input 3 is thus kinematically connected to the output mobile 5 (see Figure 2).
- the elastic member 21 provides the force necessary to keep the friction wheels 17, 19 in contact with each other, and to generate the radial force necessary to ensure good slip-free torque transmission.
- first security wheel 37 comprising a first security toothing is integral in rotation with the intermediate mobile 9
- second security wheel 39 comprising a second security toothing is rotationally integral with the output mobile 5.
- These teeth are shaped so that, during normal operation of the clutch, they do not come into contact with each other. There is therefore no meshing between these wheels 37, 39, and they do not contribute to the transmission of torque between the intermediate mobile 9 and the mobile output 5 during normal operation of the clutch system 1.
- the shape of the teeth of the safety teeth is also particular, since the teeth do not participate in the transmission of torque, and serve only as abutments in case of shock. Indeed, during normal operation of the system 1, they do not mesh according to the usual use of the term, since they interpenetrate freely and without contact or torque transmission.
- the teeth are therefore relatively thin in relation to their length.
- the width of the teeth is substantially a quarter of the pitch of said toothing, measured at the maximum depth of interpenetration.
- the tops of the teeth are pointed and asymmetrical; considering the first safety wheel 37, the downstream faces of its teeth are substantially radially oriented, while the upstream faces of said teeth have a curvature.
- the teeth of the second wheel of 39 have the opposite shape, so that, if the toothing stops in the direction of rotation of operation, the respective flanks curved most interact, the respective flanks less curved interacting in the case of a shock causing a rotation of the mobile of exit in the opposite direction.
- the small width of the teeth minimizes the probability that the teeth interact during a clutch of the system 1, and minimizes the jump when it arrives.
- the asymmetrical shape chosen for the safety teeth promotes a "jump" forward. In the case of such an interaction, the upstream curved face of one tooth slides on the curved face of the other until the friction wheels 17, 19 act again to drive the output mobile 5
- This interaction of the safety teeth generates a slight imperceptible momentary acceleration of the chronograph seconds hand and not a visible jump when the chronograph is started. A perceptible inadvertent jump is thus eliminated.
- the elastic element 21 is relatively small to absorb all manufacturing imperfections such as corn-rounds, inaccurate positioning pivots etc. and to minimize the stresses exerted on them.
- the first friction wheel 17 is therefore pressed less strongly against the second friction wheel 19 with conventional teeth, and there is also a risk that a shock can angularly move the rocker January 1 of its normal position. Without the provision of the security means described below, this displacement could for example temporarily interrupt the kinematic link in the engaged state, or could create a transient kinematic link between the intermediate mobile 9 and the output mobile 5 in the disengaged state of the clutch.
- control lever 25 also comprises a first safety arm 41 and a second safety arm 43 located on the right side. and other of the fork 35 at the end of the elastic element. These safety arms 41, 43 are integral in rotation with the control lever 25, and each serve as a stop for the fork 35 in case of impact.
- the first safety arm 41 is positioned and formed such that, in the disengaged state (Figure 1), it is impossible for the teeth of the first safety wheel 37 are within range of those of the second safety wheel 39. In other words, the fork 3 stops against the first safety arm before these teeth can interact.
- the second safety arm 43 is positioned and formed so that, in the engaged state ( Figure 2), it is impossible for the teeth of the two safety wheels 37, 39 to be out of reach. each other.
- the delay of the second hand generated by a shock that breaks the kinematic link is limited to the arc traveled until a tooth of the first safety wheel abuts against a tooth of the second wheel of security. Then, a fraction of a second later, the friction wheels 17, 19 will restore their kinematic connection under the effect of the elastic element 21, and the drive of the mobile output 5 by continuous friction as described above.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Unknown Time Intervals (AREA)
- Measurement Of Predetermined Time Intervals (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16199425.6A EP3324249A1 (fr) | 2016-11-17 | 2016-11-17 | Systeme d'embrayage pour chronographe |
PCT/EP2017/079223 WO2018091476A1 (fr) | 2016-11-17 | 2017-11-14 | Systeme d'embrayage pour chronographe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3542226A1 true EP3542226A1 (fr) | 2019-09-25 |
EP3542226B1 EP3542226B1 (fr) | 2021-01-06 |
Family
ID=57348530
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16199425.6A Withdrawn EP3324249A1 (fr) | 2016-11-17 | 2016-11-17 | Systeme d'embrayage pour chronographe |
EP17804126.5A Active EP3542226B1 (fr) | 2016-11-17 | 2017-11-14 | Systeme d'embrayage pour chronographe |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16199425.6A Withdrawn EP3324249A1 (fr) | 2016-11-17 | 2016-11-17 | Systeme d'embrayage pour chronographe |
Country Status (5)
Country | Link |
---|---|
US (1) | US11226595B2 (fr) |
EP (2) | EP3324249A1 (fr) |
JP (1) | JP7042822B2 (fr) |
CN (1) | CN110073295A (fr) |
WO (1) | WO2018091476A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3786725A1 (fr) * | 2019-08-26 | 2021-03-03 | Blancpain SA | Débrayage de deux trains d'engrenage |
EP4296798A1 (fr) * | 2022-06-23 | 2023-12-27 | Blancpain SA | Mouvement d'horlogerie comportant un mécanisme de chronographe |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0642228Y2 (ja) * | 1988-03-24 | 1994-11-02 | シチズン時計株式会社 | 時計の輪列構造 |
CH678911B5 (fr) * | 1990-04-12 | 1992-05-29 | Ebauchesfabrik Eta Ag | |
CH682034B5 (fr) * | 1991-10-14 | 1994-01-14 | Eta S.A. Fabriques D'ebauches | Pièce d'horlogerie comportant un module de chronographe adapté sur un module moteur. |
CH690524A5 (fr) * | 1995-10-31 | 2000-09-29 | Rolex Montres | Pièce d'horlogerie à mécanisme de chronographe. |
US6761478B2 (en) * | 2001-03-21 | 2004-07-13 | Glashütter Uhrenbetrieb GmbH | Chronograph with two rotational directions |
EP1406132B1 (fr) * | 2002-10-04 | 2006-04-26 | ETA SA Manufacture Horlogère Suisse | Mécanisme d'embrayage de chronographe |
EP1437633B1 (fr) | 2003-01-08 | 2006-07-26 | Patek Philippe S.A. | Rouage de chronographe |
US7597471B2 (en) * | 2005-11-24 | 2009-10-06 | Vaucher Manufacture Fleurier S.A. | Time piece chronograph clockwork movement |
EP2015145B1 (fr) * | 2007-06-11 | 2013-05-01 | Chopard Manufacture SA | Dispositif d'embrayage vertical pour pièce d'horlogerie |
CH704637B1 (fr) | 2007-11-14 | 2012-09-28 | Frank Mueller Watchland S A | Roue dentée, engrenage, mouvement horloger et pièce d'horlogerie correspondants. |
EP2085832B1 (fr) | 2008-02-04 | 2013-04-10 | Blancpain SA. | Dispositif de chronographe avec embrayage à friction |
CH700983B1 (fr) * | 2009-05-12 | 2014-03-14 | Patek Philippe Sa Geneve | Mécanisme de chronographe et pièce d'horlogerie munie d'un tel mécanisme de chronographe. |
EP2410388B1 (fr) * | 2010-07-21 | 2018-04-18 | Blancpain S.A. | Pièce d'horlogerie à double affichage |
CH709154A1 (fr) * | 2014-01-16 | 2015-07-31 | Richemont Int Sa | Mouvement et pièce d'horlogerie mécanique comprenant un mécanisme de chronographe. |
EP2945029B1 (fr) * | 2014-05-15 | 2017-05-31 | Patek Philippe SA Genève | Dispositif de verrouillage pour chronographe |
EP3032358B1 (fr) * | 2014-12-12 | 2020-10-07 | Richemont International S.A. | Mécanisme de chronographe pour mouvement horloger |
EP3059643B1 (fr) * | 2015-02-23 | 2017-07-19 | Montres Breguet S.A. | Mécanisme de chronographe |
-
2016
- 2016-11-17 EP EP16199425.6A patent/EP3324249A1/fr not_active Withdrawn
-
2017
- 2017-11-14 US US16/461,017 patent/US11226595B2/en active Active
- 2017-11-14 CN CN201780075731.4A patent/CN110073295A/zh active Pending
- 2017-11-14 EP EP17804126.5A patent/EP3542226B1/fr active Active
- 2017-11-14 JP JP2019527165A patent/JP7042822B2/ja active Active
- 2017-11-14 WO PCT/EP2017/079223 patent/WO2018091476A1/fr unknown
Also Published As
Publication number | Publication date |
---|---|
JP2019536036A (ja) | 2019-12-12 |
US20190271952A1 (en) | 2019-09-05 |
US11226595B2 (en) | 2022-01-18 |
JP7042822B2 (ja) | 2022-03-28 |
EP3324249A1 (fr) | 2018-05-23 |
EP3542226B1 (fr) | 2021-01-06 |
CN110073295A (zh) | 2019-07-30 |
WO2018091476A1 (fr) | 2018-05-24 |
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