EP2177960B1 - Mécanisme de blocage pour module d'entraînement horloger - Google Patents

Mécanisme de blocage pour module d'entraînement horloger Download PDF

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Publication number
EP2177960B1
EP2177960B1 EP08166740A EP08166740A EP2177960B1 EP 2177960 B1 EP2177960 B1 EP 2177960B1 EP 08166740 A EP08166740 A EP 08166740A EP 08166740 A EP08166740 A EP 08166740A EP 2177960 B1 EP2177960 B1 EP 2177960B1
Authority
EP
European Patent Office
Prior art keywords
finger
toothed wheel
locking
teeth
actuator
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
EP08166740A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2177960A1 (fr
Inventor
Martin Bisig
Nicolas Golay
Yves Petremand
Lionel Paratte
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 Manufacture Horlogere Suisse
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 Manufacture Horlogere Suisse filed Critical ETA SA Manufacture Horlogere Suisse
Priority to AT08166740T priority Critical patent/ATE538416T1/de
Priority to EP08166740A priority patent/EP2177960B1/fr
Priority to SG200906593-9A priority patent/SG161150A1/en
Priority to KR1020090096305A priority patent/KR101567607B1/ko
Priority to TW098134498A priority patent/TWI454864B/zh
Priority to US12/579,601 priority patent/US8259538B2/en
Priority to CN2009102063926A priority patent/CN101727060B/zh
Priority to JP2009239355A priority patent/JP5254927B2/ja
Publication of EP2177960A1 publication Critical patent/EP2177960A1/fr
Priority to HK10111241.2A priority patent/HK1145206A1/xx
Application granted granted Critical
Publication of EP2177960B1 publication Critical patent/EP2177960B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F5/00—Apparatus for producing preselected time intervals for use as timing standards
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/08—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically
    • G04C3/12—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically driven by piezoelectric means; driven by magneto-strictive means

Definitions

  • the present invention relates to a locking mechanism for watchmaking training module.
  • the invention is particularly suitable in particular for electromechanical micromotors for wristwatches.
  • Stepper motors are well known for turning electrical pulses into rotating mechanical motion.
  • the first step-by-step engine was invented in 1936 by Mr. LAVET for the watch industry; and now such engines are found in most needle quartz watches to drive the movement. This type of motor is also very common in all devices where it is desired to control the speed or positioning.
  • the "LAVET” motors have permanent magnets that can generate stable positions between electrical pulses.
  • the permanent torque thus exerted on the rotor, ie the rotating part of the engine, is supposed to prevent any inadvertent movement, even during shocks on the watch.
  • the permanent torque generally chosen to be much greater than the engine torque, is also intended to prevent incrementing more than one step simultaneously.
  • a LAVET motor drives a wheel rotating 180 degrees at each electrical pulse, every minute; this wheel is equipped at two diametrically opposite ends with lugs which engage in successive radial slots of the minute wheel. Thus, between each pulse, the two lugs are engaged in two successive radial slots of the minute wheel and block any possible movement.
  • stepper motors for example the electromechanical micromotor described in the document EP1921520 of the applicant, which comprises a linear actuator provided with an active pawl for driving the rotor in rotation, and a passive pawl to prevent rotation of the rotor in the opposite direction during the return of the actuator during its oscillations.
  • electromechanical micromotor described in the document EP1921520 of the applicant, which comprises a linear actuator provided with an active pawl for driving the rotor in rotation, and a passive pawl to prevent rotation of the rotor in the opposite direction during the return of the actuator during its oscillations.
  • the same blocking and incrementing features would also be desirable; however, it is clear that the latching mechanism described above, specific to a LAVET motor, is not adequate.
  • An object of the present invention is to provide a new mechanism which locks in stable indexing positions, and simultaneously prevents incrementation of an interlocked wheel by more than one unit simultaneously.
  • Another object of the present invention is to propose a locking mechanism that can be applied to any type of stepper motor, and not only to a "LAVET" type motor.
  • An advantage of the proposed solution is to be applicable or associated with any type of stepper motor, including for example regulating devices for mechanical watches, and potentially any type of clock training module.
  • Another advantage of the proposed solution is to no longer require permanent magnets to stabilize the rest position of the workings driven by the engine.
  • An additional advantage of the proposed solution is to provide an electromechanical stepper motor passive pawls to prevent the rotation of the rotor in the opposite direction during the return of the actuator during its oscillations.
  • the proposed solution for the blocking fundamentally differs from the locking system applied to the Lavet engine in that the energy consumption required is not related to the value of the maximum torque of the engine.
  • An important advantage of the proposed solution is therefore that the energy consumption of the locking system is potentially significantly lower than that of the engine itself.
  • the figure 1 illustrates a drive module 1, intended to mesh with a watch wheel, comprising a known step-by-step electromechanical micromotor.
  • the micromotor consists of actuators 2 which comprise moving stylets 3 rotating a rotor through active pawls 5 cooperating with the toothed wheel 7 of the rotor. Because of their active rotor drive function 5, the "actuator" actuator terminology for the actuators 2 is also often used.
  • This cooperation between the gearwheel 7 and the ratchets, as well as the sequential drive mechanism of the rotor rotation are precisely illustrated in detail on the figure 1 bis which is an enlargement of the figure 1 at the gearwheel 7, at 5 o'clock in the plane of the engine.
  • each actuator 2 is composed of two generally symmetrical parts, the first part comprising an active pusher of thrust and the second part comprising an active traction pawl in order to improve the efficiency of the engine by exerting a higher torque.
  • each actuator 2 is associated with a passive pawl 6 held elastically geared with the toothed wheel 7 so as to ensure on the one hand a precise angular positioning during the training phases when the stylets 3 are moved, and secondly to form a locking mechanism of the toothed wheel 7 to prevent any movement back.
  • the figure 1 bis illustrates the drive mechanism and indexing of the stepper motor of the figure 1 where only one passive pawl 6 and one active pawl are shown.
  • the active pawl 5 located at the end of the stylet, has oscillating movements in the direction 4 tangent to the toothed wheel 7.
  • the indentations of the toothed wheel 7 tend to drive it in a movement in the direction of rotation anti-clockwise during traction movements of the stylus 3, while each tooth of the associated passive pawl 6 then gives indexing positions for the rotation of the toothed wheel, typically corresponding to a pitch of the motor.
  • the passive pawl 6 prevents the active pawl 5 from driving the toothed wheel 7 in the opposite direction and to maintain the angular position of the toothed wheel 7 between each step.
  • This locking and indexing mechanism described does not, however, prevent any unwanted acceleration of the toothed wheel 7 in the counter-clockwise direction, as for example in the case of excessive engine torque exerted by the ratchet or pawls active 5 if the electrical impulses generated by the actuators 2 are of too great amplitude, or even between the steps of the engine if shocks are experienced by the watch case containing such an electromechanical motor.
  • FIGS 2 to 7 illustrate a preferred embodiment of the locking and indexing mechanism according to the invention, which make it possible to overcome these shortcomings of the prior art. They all represent a sectional view in the plane of rotation of a toothed wheel 7 driven by an active pawl 5 which engages in the teeth of the toothed wheel 7 and moves linearly by oscillation movements in a tangent direction to the toothed wheel 7 at the snap, and the locking device, composed in particular of two separate locking fingers 8 and 9, in different positions depending on the state of the mechanism.
  • the first locking pin 8 is housed between two stop elements 15, 16 so that it is guided to have only vertical movements and thus to have only one degree of freedom in translation.
  • this degree of freedom could, however, also be rotated.
  • This first finger is intended to block any rotational movement of the toothed wheel when engaged in one of his teeth.
  • the second locking finger 9 is arranged between two stops 10 and 11, so that it limits the angular travel of the toothed wheel when engaged in one of its teeth.
  • the spacing between the stops 10,11 limits the angular travel of the toothed wheel 7 to the displacement of a single tooth, thus corresponding to a pitch of the motor.
  • the figure 2 illustrates the locking device according to the invention in a state at rest, before a motor step.
  • the two fingers of 8 and 9 are raised, and housed in two consecutive teeth of the toothed wheel 7.
  • the second locking finger 9 is also housed against the first stop 10.
  • the pawl 5 is engaged in one of the teeth 71 of the toothed wheel 7, and moves according to linear oscillation movements according to the arrow 4 (NB: the mobile stylet, present on the Figures 1 and 1 bis, is no longer materialized in this figure or on the following because it is not necessary to understand the locking mechanism described below).
  • NB the mobile stylet
  • the figure 3 illustrates the locking device during the lowering step (arrow A) of the first locking finger 9.
  • the only degree of freedom of the first locking finger 8 is in translation according to a radius of the toothed wheel 7, ie perpendicular to the movement of the actuator and the active pawl 5, as will be seen in the following figures.
  • the figure 4 illustrates the locking device according to the invention during a pitch of the motor, ie when the toothed wheel 7 is rotated by the active pawl 5 (step B, illustrated by the corresponding arrows B).
  • the rotation of the toothed wheel 7, in one of the teeth of which the second locking finger 9 is engaged thus causes the finger 9 in the same translational movement as that of the pawl, according to the arrow (B), in a tangent direction to the wheel and the meaning corresponding to one of its two degrees of freedom.
  • the toothed wheel 7 stops as soon as the second finger 9 is positioned against the second stop 11, which prevents any further rotation of the toothed wheel.
  • the figure 5 illustrates the locking device according to the invention, in the blocking state of the second locking finger 9 against the stop 11.
  • the arrow (C) illustrates the step of raising the first locking finger 8 which is to engage in one of the teeth of the toothed wheel and thus blocks any movement of the toothed wheel 7, even in the opposite direction to that in which it was activated until then, ie in the direction of the clockwise for the described embodiment.
  • the device will be again in a stable state, preventing any rotational movement of the toothed wheel, but this time with the two fingers 8,9 spaced apart from two teeth, unlike the figure 2 where the two fingers were housed in two consecutive teeth of the wheel.
  • the angular travel of the toothed wheel 7 therefore corresponds, according to the illustrated embodiment, to at most one tooth of the toothed wheel 7.
  • the figure 6 illustrates the locking device after raising the first locking finger and during the return steps of the actuator (arrow D) and the second locking finger (arrow E2), which had to be lowered beforehand (arrow E1) for to be released from the tooth to allow the translation movement in the same direction as the pawl 5.
  • the steps (D) and (E2) of the return of the active pawl 5 and the second finger 9 can be executed independently one of the other and sequentially in any order.
  • the figure 7 illustrates the locking device according to the invention at rest at the end of a step of the motor, ie once the second finger 8 has returned in abutment against the first stop 10 and that it has been raised in one of the teeth of the toothed wheel 7 (step F, illustrated by the corresponding arrow in the figure).
  • step F illustrated by the corresponding arrow in the figure.
  • the first finger 8 has a degree of freedom in translation, vertically according to the figures, to be high or lowered, and thus engaged or disengaged in one of the teeth of the toothed wheel 7, and the second finger 9 has the same degree of freedom in translation, and a degree of freedom in additional translation between the stops 10 and 11 , horizontal according to the figures, and which corresponds to the direction of the oscillations 4 of the active pawl 5 and the tangent to the toothed wheel 7 at the gear with the finger 9.
  • FIG 7 it is also possible to distinguish an electronic circuit 14, preferably programmable, for managing the sequences of movements of the locking fingers 8 and 9.
  • This circuit 14 has been added to this figure because it corresponds to a preferred embodiment of the invention, according to which the movements of the fingers 8, 9 are controlled by electrical signals causing the movement electrostatic actuators 12,13 respectively coupled to each finger 8,9.
  • the motor actuator 2 has also been added to avoid confusion with the actuators 12,13 of the fingers 8,9.
  • the lowering of the first finger 8 after its release from said toothed wheel 7 corresponds to a first step A passing from the stable state 110 of the system "at rest”; at a state 010 in which the rotation of the toothed wheel is possible.
  • the driving of the toothed wheel 7 in rotation by the active pawl 5 of the actuator 2 corresponds to a second step B, which causes the movement of the second locking pin 9 of the abutment 10 according to the state 010 of the system, towards the other stop 11, which blocks the stroke of the gearwheel further and then brings the system into the state 011.
  • Step D of disengagement and return of the active pawl 5 of the actuator 2 does not change the state of the locking system; however the corresponding step E disengagement and return of the second finger against the first stop 10 can be split into two substeps E1, lowering the second finger bringing the system of the state 111 to the state 101, and E2, bringing the system of the state 101 to 100.
  • the steps D and E of release and return of the active pawl 5 and the second finger 9 take place simultaneously.
  • step F of raising the second finger 9 which leads it to engage in one of the teeth of the toothed wheel 7 brings the system to the initial state 110 said "rest” and thus ends the cycle of incrementation of a motor pitch.
  • the sequencing described which ensures that always at least one of the two fingers is engaged in one of the teeth, allows either to maintain the locking device in a "stable” state, ie in which the toothed wheel is completely immobilized (case of first finger engaged in the toothing of the wheel 7), either in a "bounded” state, ie in which the travel of the toothed wheel is limited (in the case of the second finger 9 engaged in the toothing of the wheel 7).
  • Obtaining stable states according to the invention therefore no longer requires the use of magnets to apply resting positioning torques;
  • the first finger eliminates the use of a passive ratchet whose machining is more complex and the cost therefore more expensive.
  • the proposed solution decreases the total cost of the locking device while improving its functionality since now the angular travel of the gear wheel is always bounded.
  • the person skilled in the art will also be able to observe that the manner of actuating the pawls 5 meshing with the toothed wheel is completely transparent for the device and the locking method described, so that it applies equally to clockwork wheels. electromechanical than purely mechanical.
  • the desired sequence is preferably obtained by electronic programming; however, an embodiment can be conceived according to which at least the lowering and raising movements of the fingers can be controlled by a cam.
  • the finger actuators are, according to a preferred embodiment of the invention, electrostatic in the context of an implementation of a micromotor locking device for wristwatches, it is also possible to imagine using hydraulic actuators. for other horological applications.
  • the shape of the bevel teeth illustrated according to the figures described and which tends to rotate the toothed wheel counterclockwise could be modified by a similar shape in the other direction or for example in niche to ensure complete blockage of the wheel even in case of impact.
  • a slot form would make it impossible to release the tooth under the action of forces external to the system, thanks to the cooperation with a shape identical but corresponding inverse slot for the end of the locking fingers 8.9.
  • the form of teeth shown in the figures is, however, adapted to mesh cogwheels in the direction of clockwise, and thus allows an easy association with needle wheel display for example.
  • Training module 2 Motor actuator 3 Mobile stylus of the actuator 4 Direction of oscillations of the mobile stylus 5 Active ratchet of the actuator 6 Passive ratchet 7 Gear wheel 8 First blocking finger 9 Second locking finger 10 First stop for the second locking finger 11 Second stop for the second locking finger 12 Actuator of the first locking finger 13 Actuator of the second locking finger 14 Programmable circuit for actuating the locking fingers 15 First stop element of the first locking finger 16 Second stop element of the first locking finger AT Step of lowering the first locking finger B Step of driving the gearwheel and the second locking finger VS First finger recovery step D Active ratchet return step in the opposite direction to the gear drive E1 Step of lowering the second locking finger E2 Step of return of the second blocking finger F Step of raising the second locking finger 110 State of the system at rest, two fingers raised on two consecutive teeth, second finger raised against the first stop 010 State of the system allowing the incrementation of a tooth, first finger down, second finger raised against the first stop 011 State of the system after the incrementation of a tooth, second finger raised and against

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Transmission Devices (AREA)
  • Electric Clocks (AREA)
  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP08166740A 2008-10-16 2008-10-16 Mécanisme de blocage pour module d'entraînement horloger Active EP2177960B1 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
AT08166740T ATE538416T1 (de) 2008-10-16 2008-10-16 Blockiermechanismus für modul eines uhrwerksantriebs
EP08166740A EP2177960B1 (fr) 2008-10-16 2008-10-16 Mécanisme de blocage pour module d'entraînement horloger
SG200906593-9A SG161150A1 (en) 2008-10-16 2009-09-30 Locking mechanism for timepiece drive module
KR1020090096305A KR101567607B1 (ko) 2008-10-16 2009-10-09 시계 구동 모듈용 로킹 메커니즘
TW098134498A TWI454864B (zh) 2008-10-16 2009-10-12 時計傳動模組的鎖定機構
US12/579,601 US8259538B2 (en) 2008-10-16 2009-10-15 Locking mechanism for timepiece drive module
CN2009102063926A CN101727060B (zh) 2008-10-16 2009-10-15 时钟驱动模块的锁定机构
JP2009239355A JP5254927B2 (ja) 2008-10-16 2009-10-16 時計駆動モジュールのためのロック機構
HK10111241.2A HK1145206A1 (en) 2008-10-16 2010-12-02 Locking mechanism for timepiece drive module

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08166740A EP2177960B1 (fr) 2008-10-16 2008-10-16 Mécanisme de blocage pour module d'entraînement horloger

Publications (2)

Publication Number Publication Date
EP2177960A1 EP2177960A1 (fr) 2010-04-21
EP2177960B1 true EP2177960B1 (fr) 2011-12-21

Family

ID=40225282

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08166740A Active EP2177960B1 (fr) 2008-10-16 2008-10-16 Mécanisme de blocage pour module d'entraînement horloger

Country Status (9)

Country Link
US (1) US8259538B2 (zh)
EP (1) EP2177960B1 (zh)
JP (1) JP5254927B2 (zh)
KR (1) KR101567607B1 (zh)
CN (1) CN101727060B (zh)
AT (1) ATE538416T1 (zh)
HK (1) HK1145206A1 (zh)
SG (1) SG161150A1 (zh)
TW (1) TWI454864B (zh)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2469353A1 (fr) * 2010-12-22 2012-06-27 ETA SA Manufacture Horlogère Suisse Assemblage d'une pièce ne comportant pas de domaine plastique
FR2985721B1 (fr) * 2012-01-12 2017-04-07 Silmach Indexation passive d'un element mobile presentant des dents
EP2735922A1 (fr) * 2012-11-23 2014-05-28 ETA SA Manufacture Horlogère Suisse Mécanisme d'entraînement d'aiguilles d'une montre électro-mécanique, muni d'un dispositif de verrouillage
CN104238338B (zh) * 2014-07-31 2017-12-12 厦门理工学院 振动型行波齿轮传动装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53110559A (en) * 1977-03-08 1978-09-27 Citizen Watch Co Ltd Electronic watch
US4647218A (en) 1985-09-16 1987-03-03 Timex Corporation Small stepping motor driven watch
US5959376A (en) * 1998-09-10 1999-09-28 Sandia Corporation Microelectromechanical reciprocating-tooth indexing apparatus
US6211599B1 (en) * 1999-08-03 2001-04-03 Sandia Corporation Microelectromechanical ratcheting apparatus
DE02405094T1 (de) * 2002-02-11 2004-05-19 Rolex Sa Jährlicher Kalendermechanismus für Uhrwerk
JP2006516117A (ja) 2002-11-21 2006-06-22 ジェネンテック・インコーポレーテッド 抗ＥｒｂＢ２抗体を用いた非悪性疾病または疾患の治療
FR2852111B1 (fr) * 2003-03-05 2005-06-24 Univ Franche Comte Dispositif d'horloge utilisant la technologie mems
FR2883276B1 (fr) * 2005-03-18 2007-05-11 Silmach Soc Par Actions Simpli Procede et dispositif pour deplacer un element a entrainer utilisant un element actionneur forme par gravure dans un materiau semi-conducteur
FR2883277B1 (fr) * 2005-03-18 2007-05-11 Silmach Soc Par Actions Simpli Procede et dispositif pour deplacer un element a entrainer utilisant un element actionneur forme par gravure dans un materiau semi-conducteur
EP1801671B1 (fr) * 2005-12-22 2009-05-13 Montres Breguet S.A. Montre à calendrier pourvu de moyens de blocage
DE602006005058D1 (de) * 2006-11-13 2009-03-19 Eta Sa Mft Horlogere Suisse Einen MEMS-Mikromotor umfassendes Antriebsmodul, Verfahren zur Herstellung dieses Moduls und mit diesem Modul ausgerüstete Uhr

Also Published As

Publication number Publication date
SG161150A1 (en) 2010-05-27
KR20100042591A (ko) 2010-04-26
EP2177960A1 (fr) 2010-04-21
JP5254927B2 (ja) 2013-08-07
US8259538B2 (en) 2012-09-04
HK1145206A1 (en) 2011-04-08
US20100097900A1 (en) 2010-04-22
CN101727060A (zh) 2010-06-09
ATE538416T1 (de) 2012-01-15
TW201030482A (en) 2010-08-16
KR101567607B1 (ko) 2015-11-09
JP2010096766A (ja) 2010-04-30
CN101727060B (zh) 2012-06-20
TWI454864B (zh) 2014-10-01

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