US3451280A - Device for transforming the movement for an electronic watch - Google Patents
Device for transforming the movement for an electronic watch Download PDFInfo
- Publication number
- US3451280A US3451280A US539852A US3451280DA US3451280A US 3451280 A US3451280 A US 3451280A US 539852 A US539852 A US 539852A US 3451280D A US3451280D A US 3451280DA US 3451280 A US3451280 A US 3451280A
- Authority
- US
- United States
- Prior art keywords
- wheel
- resonator
- movement
- click
- wheels
- 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 - Lifetime
Links
Images
Classifications
-
- 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
- G04C3/10—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 electromagnetic means
- G04C3/101—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 electromagnetic means constructional details
-
- 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
- G04B11/005—Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power with magnetic elements
-
- 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
- G04B11/02—Devices allowing the motion of a rotatable part in only one direction
- G04B11/04—Pawl constructions therefor, e.g. pawl secured to an oscillating member actuating a ratchet
-
- 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
-
- 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
- G04C3/10—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 electromagnetic means
- G04C3/101—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 electromagnetic means constructional details
- G04C3/104—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 electromagnetic means constructional details of the pawl or the ratched-wheel
- G04C3/105—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 electromagnetic means constructional details of the pawl or the ratched-wheel pawl and ratched-wheel being magnetically coupled
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/15—Intermittent grip type mechanical movement
- Y10T74/1526—Oscillation or reciprocation to intermittent unidirectional motion
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/15—Intermittent grip type mechanical movement
- Y10T74/1526—Oscillation or reciprocation to intermittent unidirectional motion
- Y10T74/1553—Lever actuator
- Y10T74/1555—Rotary driven element
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
Definitions
- This disclosure concerns a device for transforming oscillatory movement of a resonator for an electronic Watch into a continuous rotatory movement in which a click is rigid with the resonator driving the ratchet wheel, there being a first magnetized wheel adapted to be rotated by the ratchet wheel and a second magnetized wheel adapted to be rotated magnetically by the first magnetized wheel, the first and second magnetized wheels being mechanically separated from each other so that one of the magnetized Wheels can rotate independently of the other magnetized wheel, the first wheel having a lesser moment of inertia than the ratchet wheel but a greater thickness.
- the oscillating movement of the resonator is generally transformed into a rotary movement for driving the gear train, by means of a click cooperating with a ratchet wheel, constituting the first wheel of the dial train.
- the transformation of the movement is accompanied by a reduction of the frequency, the resonator operating at a frequency relatively high.
- This device which has also the advantage of constituting a mechanical filter hindering the transmission of the jerky advance of the first ratchet wheel to the members of the movement, has nevertheless the major disadvantage, other than its complexity, of only attaining a relatively small efiiciency, of the order of 30%
- the present invention has for its object to provide a device for transforming the oscillating movement of a resonator of an electronic watch into a movement of continuous rotation without jerks, having the same advantages as the double click, but of simpler construction and of greater efiiciency.
- This device is characterised in that it comprises a click rigid with the resonator driving a ratchet wheel, a first magnetized wheel adapted to be rotated mechanically by the ratchet wheel, and a second magnetized wheel adapted to be rotated magnetically by the first magnetized wheel, the first and second magnetized 3,4i5 l,28fi Patented June 24, I969 formed of a blade 3 and a ruby pallet 4.
- the latter drives a ratchet wheel 5 having a large number of teeth in the shape of isosceles triangles.
- the wheel 5 carries on its shaft Ia magnetized polar wheel 8 cut so as to have six poles 9 alternately south and north.
- This wheel 8 is consituted by an alloy of platinum cobalt of very high magnetic strength.
- the magnetized polar wheel 8 drives a wheel 10 of large diameter, constituting the first wheel of the dial train.
- the wheel 10 is constituted of a toothed crown 11, magnetized in the same manner as the wheel 8, mounted on a brass disc 12. Its rim is cut so as to form polar teeth 13 homologous to the poles 9 of the Wheel 8.
- the driving of the wheel 10 by the wheel 9 takes place in a known manner which will not be described in any more detail.
- the magnetic coupling between the wheels 8 and 10 is not chosen too high.
- an airgap is provided between the poles 9 and the corresponding poles of the wheel 10 sufiicient so that the power transmitted is approximately equal to one microwatt (1 ,u.W.). This power is sufficient to drive the wheel 10 and the gear train, and also a date device, but it is negligible with respect to the power supplied by the resonator. During braking of the wheel 10 this demand on the battery of 1 ,uW. is also negligible.
- This device for transforming the movement has the advantage of being of great simplicity, of avoiding to a large degree losses of power due to friction, and of constituting an excellent mechanical filter isolating the resonator [from the gear train. Moreover, the precision of the wheels 8 and 10 can be much lower than that of wheels of mechanical engagement. Thus it is possible to make entirely independently, on the one hand the oscillator with its device for transforming the movement comprising the click, the ratchet wheel and its polar wheel 8, and on the other hand the gear train mounted on the plate and including the wheel 10, and to assemble then without difliculty these two parts.
- the wheel 10 can be made in la ferro-nickel alley or even in soft iron.
- a device for transforming oscillatory movement of a normally vibrating resonator of an electronic watch into a continuous, smooth, rotatory movement comprising:
- the second wheel being positioned in the same plane as said first wheel and being adapted to be driven magnetically by the first wheel; said second wheel being rotatable against or lockable relative to said first wheel when said watch is set;
- a device for transforming oscillatory movement of a normally vibrating resonator of an electronic Watch into a continuous, smooth, rotary movement comprising:
- the second wheel being positioned in the same plane as said first wheel and being adapted to be driven magnetically by the first wheel; said second wheel being rotatable against or lockable relative to said first wheel when said watch is set;
- a device for transforming oscillatory movement of a normally vibrating resonator of an electronic watch into a continuous, smooth, rotary movement comprising:
- a device for transforming oscillatory movement of a resonator for an electronic Watch into a continuous, smooth, rotary movement comprising:
- a device for transforming oscillatory movement of a resonator for an electronic watch into a continuous, smooth, rotary movement comprising:
- a device for transforming oscillatory movement of a resonator tor an electronic watch into a continuous, smooth, rotary movement comprising:
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Electromechanical Clocks (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1066765A CH457295A (fr) | 1965-07-29 | 1965-07-29 | Dispositif de transformation du mouvement oscillant d'un résonateur de montre électromécanique |
Publications (1)
Publication Number | Publication Date |
---|---|
US3451280A true US3451280A (en) | 1969-06-24 |
Family
ID=4365568
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US539852A Expired - Lifetime US3451280A (en) | 1965-07-29 | 1966-04-04 | Device for transforming the movement for an electronic watch |
US810324A Expired - Lifetime US3540206A (en) | 1965-07-29 | 1969-03-25 | Motion transforming device for electronic timepieces and the like |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US810324A Expired - Lifetime US3540206A (en) | 1965-07-29 | 1969-03-25 | Motion transforming device for electronic timepieces and the like |
Country Status (8)
Country | Link |
---|---|
US (2) | US3451280A (fr) |
AT (1) | AT264379B (fr) |
BE (1) | BE680716A (fr) |
CH (1) | CH457295A (fr) |
DE (1) | DE1523886C3 (fr) |
GB (1) | GB1090601A (fr) |
NL (1) | NL145688B (fr) |
SE (1) | SE314031B (fr) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3537326A (en) * | 1968-07-05 | 1970-11-03 | Centre Electron Horloger | Device for transforming oscillating movement into rotational movement in particular for timepieces |
US3599501A (en) * | 1968-08-19 | 1971-08-17 | Centre Electron Horloger | Pawl arrangement |
US3727396A (en) * | 1971-04-27 | 1973-04-17 | Omega Brandt & Freres Sa Louis | Oscillating motor |
US3775963A (en) * | 1973-01-12 | 1973-12-04 | T Clapham | Magnetic clock |
US3917965A (en) * | 1970-06-24 | 1975-11-04 | Omega Brandt & Freres Sa Louis | Transmission device for a horological mechanism |
AU634253B2 (en) * | 1989-07-11 | 1993-02-18 | Lan Li | High-efficiency gear transmission |
US20040209708A1 (en) * | 1999-12-03 | 2004-10-21 | Bulpett David A. | Water resistant polyurea elastomers for golf equipment |
WO2012013374A1 (fr) * | 2010-07-30 | 2012-02-02 | The Swatch Group Research And Development Ltd | Transmission de force a contact reduit ou sans contact dans un mouvement d ' horlogerie |
CH706355A1 (fr) * | 2012-04-13 | 2013-10-15 | I M H Innovations Manufactures Horlogeres Sa | Procédé de réalisation de composants pour mouvement de montre mécanique. |
US20130279302A1 (en) * | 2010-12-15 | 2013-10-24 | Asgalium Unitec Sa | Magnetic resonator for a mechanical timepiece |
US20160370766A1 (en) * | 2013-12-23 | 2016-12-22 | Eta Sa Manufacture Horlogere Suisse | Mechanical clock movement with magnetic escapement |
US20170123379A1 (en) * | 2014-09-25 | 2017-05-04 | The Swatch Group Research And Development Ltd | Interaction between two timepiece components |
US20170176937A1 (en) * | 2015-12-22 | 2017-06-22 | Montres Breguet S.A. | Timepiece mechanism comprising a pivoting member provided with magnetic return means |
EP2889704B1 (fr) * | 2013-12-23 | 2017-11-08 | Nivarox-FAR S.A. | Mécanisme d'échappement à cylindre d'horlogerie sans contact |
US10054908B2 (en) | 2015-08-04 | 2018-08-21 | The Swatch Group Research And Development Ltd | Escapement with escape wheel with field ramps and non-return |
US20220050418A1 (en) * | 2020-08-12 | 2022-02-17 | The Swatch Group Research And Development Ltd | Timepiece mechanism provided with a magnetic gear |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH526804A (fr) * | 1969-10-27 | 1972-04-14 | Omega Brandt & Freres Sa Louis | Pièce d'horlogerie |
GB1343223A (en) * | 1971-02-17 | 1974-01-10 | Suwa Seikosha Kk | Detent apparatus eg for use in an electronic timepiece |
CH555553A (fr) * | 1972-02-28 | 1974-10-31 | ||
BE1022205B1 (fr) * | 2013-06-12 | 2016-03-01 | Mintiens, Benoît | Transmission pour horloge et horloge equipee de cette transmission. |
WO2015097172A2 (fr) * | 2013-12-23 | 2015-07-02 | The Swatch Group Research And Development Ltd | Dispositif regulateur de la vitesse angulaire d'un mobile dans un mouvement horloger comprenant un echappement magnetique |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2481360A (en) * | 1948-07-21 | 1949-09-06 | Gen Electric | Intermittent motion magnetic drive |
CH319707A (de) * | 1954-03-23 | 1957-02-28 | Camille Bauer Aktiengesellscha | Magnetisches Übersetzungs-eingriffsgetriebe zur Übertragung kleiner Drehmomente, insbesondere für Messinstrumente |
US3184981A (en) * | 1961-01-19 | 1965-05-25 | Bulova Watch Co Inc | Electronically-controlled timepiece and motion transformer therefor |
-
1965
- 1965-07-29 CH CH1066765A patent/CH457295A/fr unknown
-
1966
- 1966-03-03 AT AT201966A patent/AT264379B/de active
- 1966-03-04 DE DE1523886A patent/DE1523886C3/de not_active Expired
- 1966-03-07 SE SE2949/66A patent/SE314031B/xx unknown
- 1966-03-16 NL NL666603449A patent/NL145688B/xx unknown
- 1966-04-04 US US539852A patent/US3451280A/en not_active Expired - Lifetime
- 1966-05-09 BE BE680716D patent/BE680716A/xx unknown
- 1966-05-10 GB GB20572/66A patent/GB1090601A/en not_active Expired
-
1969
- 1969-03-25 US US810324A patent/US3540206A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2481360A (en) * | 1948-07-21 | 1949-09-06 | Gen Electric | Intermittent motion magnetic drive |
CH319707A (de) * | 1954-03-23 | 1957-02-28 | Camille Bauer Aktiengesellscha | Magnetisches Übersetzungs-eingriffsgetriebe zur Übertragung kleiner Drehmomente, insbesondere für Messinstrumente |
US3184981A (en) * | 1961-01-19 | 1965-05-25 | Bulova Watch Co Inc | Electronically-controlled timepiece and motion transformer therefor |
Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3537326A (en) * | 1968-07-05 | 1970-11-03 | Centre Electron Horloger | Device for transforming oscillating movement into rotational movement in particular for timepieces |
US3599501A (en) * | 1968-08-19 | 1971-08-17 | Centre Electron Horloger | Pawl arrangement |
US3917965A (en) * | 1970-06-24 | 1975-11-04 | Omega Brandt & Freres Sa Louis | Transmission device for a horological mechanism |
US3727396A (en) * | 1971-04-27 | 1973-04-17 | Omega Brandt & Freres Sa Louis | Oscillating motor |
US3775963A (en) * | 1973-01-12 | 1973-12-04 | T Clapham | Magnetic clock |
AU634253B2 (en) * | 1989-07-11 | 1993-02-18 | Lan Li | High-efficiency gear transmission |
US20040209708A1 (en) * | 1999-12-03 | 2004-10-21 | Bulpett David A. | Water resistant polyurea elastomers for golf equipment |
WO2012013374A1 (fr) * | 2010-07-30 | 2012-02-02 | The Swatch Group Research And Development Ltd | Transmission de force a contact reduit ou sans contact dans un mouvement d ' horlogerie |
RU2559984C2 (ru) * | 2010-07-30 | 2015-08-20 | Те Свотч Груп Рисерч Энд Дивелопмент Лтд | Управляемая контактная или бесконтактная передача усилия в часах |
US20130279302A1 (en) * | 2010-12-15 | 2013-10-24 | Asgalium Unitec Sa | Magnetic resonator for a mechanical timepiece |
US8794823B2 (en) * | 2010-12-15 | 2014-08-05 | Asgalium Unitec Sa | Magnetic resonator for a mechanical timepiece |
CH706355A1 (fr) * | 2012-04-13 | 2013-10-15 | I M H Innovations Manufactures Horlogeres Sa | Procédé de réalisation de composants pour mouvement de montre mécanique. |
US20160370766A1 (en) * | 2013-12-23 | 2016-12-22 | Eta Sa Manufacture Horlogere Suisse | Mechanical clock movement with magnetic escapement |
US9804570B2 (en) * | 2013-12-23 | 2017-10-31 | Eta Sa Manufacture Horlogere Suisse | Mechanical clock movement with magnetic escapement |
EP2889704B1 (fr) * | 2013-12-23 | 2017-11-08 | Nivarox-FAR S.A. | Mécanisme d'échappement à cylindre d'horlogerie sans contact |
CN106716264A (zh) * | 2014-09-25 | 2017-05-24 | 斯沃奇集团研究和开发有限公司 | 两个钟表构件之间的相互作用 |
US10459406B2 (en) * | 2014-09-25 | 2019-10-29 | The Swatch Group Research And Development Ltd | Interaction between two timepiece components |
US20170123379A1 (en) * | 2014-09-25 | 2017-05-04 | The Swatch Group Research And Development Ltd | Interaction between two timepiece components |
JP2017524929A (ja) * | 2014-09-25 | 2017-08-31 | ザ・スウォッチ・グループ・リサーチ・アンド・ディベロップメント・リミテッド | 2つの計時器用部品の間の相互作用 |
CN106716264B (zh) * | 2014-09-25 | 2019-07-16 | 斯沃奇集团研究和开发有限公司 | 钟表及钟表机构 |
US10054908B2 (en) | 2015-08-04 | 2018-08-21 | The Swatch Group Research And Development Ltd | Escapement with escape wheel with field ramps and non-return |
CN106909049A (zh) * | 2015-12-22 | 2017-06-30 | 蒙特雷布勒盖股份有限公司 | 包括设置有磁性回复装置的枢转件的钟表机构 |
CN106909049B (zh) * | 2015-12-22 | 2019-06-18 | 蒙特雷布勒盖股份有限公司 | 包括设置有磁性回复装置的枢转件的钟表机构 |
US9921546B2 (en) * | 2015-12-22 | 2018-03-20 | Montres Breguet S.A. | Timepiece mechanism comprising a pivoting member provided with magnetic return means |
US20170176937A1 (en) * | 2015-12-22 | 2017-06-22 | Montres Breguet S.A. | Timepiece mechanism comprising a pivoting member provided with magnetic return means |
US20220050418A1 (en) * | 2020-08-12 | 2022-02-17 | The Swatch Group Research And Development Ltd | Timepiece mechanism provided with a magnetic gear |
Also Published As
Publication number | Publication date |
---|---|
DE1523886C3 (de) | 1973-09-20 |
NL6603449A (fr) | 1967-01-30 |
DE1523886A1 (de) | 1971-03-04 |
CH1066765A4 (fr) | 1967-12-15 |
CH457295A (fr) | 1968-07-31 |
DE1523886B2 (de) | 1973-03-08 |
US3540206A (en) | 1970-11-17 |
NL145688B (nl) | 1975-04-15 |
AT264379B (de) | 1968-08-26 |
BE680716A (fr) | 1966-10-17 |
GB1090601A (en) | 1967-11-08 |
SE314031B (fr) | 1969-08-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3451280A (en) | Device for transforming the movement for an electronic watch | |
JP5171821B2 (ja) | 電気機械式逃がし止め装置とそのような装置を利用する時計部品 | |
US3695035A (en) | Timepiece movement | |
US3978654A (en) | Motion transformer | |
US3984972A (en) | Transducer for quartz crystal timepiece | |
US4079582A (en) | Electronic timepiece | |
US3710567A (en) | Calendar watch with isolated hour hand changing means combined with synchronization gearing | |
US3277644A (en) | Tuning fork timepiece | |
US5025428A (en) | Electromagnetic escapement for mechanically driven watch or clock | |
US3979901A (en) | Construction of the gear train for a timepiece | |
US4266291A (en) | Electromagnetic swing device | |
DE1034551B (de) | Elektrische Uhr | |
US3691754A (en) | Vibratory drive systems | |
US3604201A (en) | Method of driving the gearing of an electronic timepiece and an electronic timepiece for implementing said method | |
JPS605915B2 (ja) | 電気時計の駆動装置 | |
US3641761A (en) | Watch transducer | |
US3411368A (en) | Magnetic driving device | |
US4376991A (en) | Electronic watch with analogic display | |
GB1491388A (en) | Apparatus for use in a timepiece or other instrument | |
US5197045A (en) | Electronic watch | |
US4022013A (en) | Regulating device for electric timepieces | |
GB1432536A (en) | Quartz crystal timepiece | |
US3312053A (en) | Step by step drvie mechanism for timepiece | |
US3824781A (en) | Horological movement employing inductive stepping motor | |
US2888797A (en) | Electric watch |