GB1463990A - Synchronization method for electromechanical oscillators of timepieces - Google Patents
Synchronization method for electromechanical oscillators of timepiecesInfo
- Publication number
- GB1463990A GB1463990A GB795074A GB795074A GB1463990A GB 1463990 A GB1463990 A GB 1463990A GB 795074 A GB795074 A GB 795074A GB 795074 A GB795074 A GB 795074A GB 1463990 A GB1463990 A GB 1463990A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resonator
- damping
- synchronizing signal
- balance
- frequency
- 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
Links
Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C11/00—Synchronisation of independently-driven clocks
- G04C11/08—Synchronisation of independently-driven clocks using an electro-magnet or-motor for oscillation correction
- G04C11/081—Synchronisation of independently-driven clocks using an electro-magnet or-motor for oscillation correction using an electro-magnet
- G04C11/084—Synchronisation of independently-driven clocks using an electro-magnet or-motor for oscillation correction using an electro-magnet acting on the balance
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Electromechanical Clocks (AREA)
- Control Of Stepping Motors (AREA)
Abstract
1463990 Electronic timepieces ITT INDUSTRIES Inc 21 Feb 1974 [24 Feb 1973] 7950/74 Heading G3T In an electronic timepiece, oscillations of an electro-mechanical resonator, e.g. a balance wheel, are stabilized by synchronizing the oscillations with and locking on to a synchronizing signal which is substantially at the natural frequency of the resonator and derived from a crystal controlled oscillator followed by a frequency divider, the duration and/or time position of driving and damping current pulses through the drive coil of the resonator being controlled, with respect to the natural rest position of the resonator, as a function of the phase difference between the synchronizing signal and a signal derived from the resonator oscillations. The provision of damping pulses to withdraw energy from the resonator is said to extend the synchronizing or capture range of the synchronizing signal with respect to the mechanical resonator. In Fig. 4 a switch K is operated by a balance wheel carrying magnets which co-operate with a drive coil L. A transistor Ti is controlled by the synchronizing signal being rendered conductive during period "A" Fig. 2a (not shown) of the signal. In Fig. 2, "N" indicates driving current pulses triggered after the balance has passed its rest position and "V" pulses triggered before the balance has reached its rest position. Drive current will flow in coil L when the closed period of switch K occurs during the period "A". If, as illustrated in Fig. 2c, (not shown), T1 is switched OFF before switch K opens the direction of the current pulse in L is reversed as energy in L discharges via a diode D, a resistor R and switch K, thus acting as a damping current pulse N'. Such would be the case if the resonator frequency had decreased with respect to the synchronizing signal frequency or if their mutual phase displacement had altered. The consequent reduction in drive current and the damping will increase the frequency of the resonator oscillations to the frequency of the synchronizing signal. If the closing time of K lies outside the conducting period of T1, then damping current due to voltage induced in L by the magnet system, will flow during the entire closing time, Fig. 2d (not shown) illustrates the case where excessive phase difference occurs e.g. due to externally applied disturbance; in this case only damping current pulses N' are produced after the balance passes its rest position. In an embodiment described with reference to Figs. 3, 5 (not shown) the drive pulses are controlled by a synchronizing signal I and the damping current pulses by a synchronizing signal II at the same frequency as signal I and having a duty factor equal to or less than that of signal I. Fig. 6 (not shown) illustrates an embodiment wherein a balance is maintained in oscillation by a circuit employing current feedback from the balance and is stabilized by driving and damping pulse synchronizing signals. The discharge path of the drive coil may include in combination or individually - a resistor, a diode, a transistor; alternatively the coil may be periodically short-circuited.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19732309291 DE2309291A1 (en) | 1973-02-24 | 1973-02-24 | PROCESS FOR SYNCHRONIZING MECHANICAL VIBRATORS OF USED WATCHES |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1463990A true GB1463990A (en) | 1977-02-09 |
Family
ID=5872991
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB795074A Expired GB1463990A (en) | 1973-02-24 | 1974-02-21 | Synchronization method for electromechanical oscillators of timepieces |
Country Status (6)
Country | Link |
---|---|
US (1) | US3921386A (en) |
JP (1) | JPS501776A (en) |
DE (1) | DE2309291A1 (en) |
FR (1) | FR2262344B3 (en) |
GB (1) | GB1463990A (en) |
IT (1) | IT1029540B (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1056166A (en) * | 1975-03-27 | 1979-06-12 | Jauch, Heinz | Method and aparatus for synchronising a mechanical oscillating system to the accuracy of a quartz standard |
DE2749006C3 (en) * | 1977-11-02 | 1981-12-17 | Urgos Uhrenfabrik Schwenningen Haller, Jauch und Pabst GmbH& Co, 7220 Schwenningen | Electronic correction device for a pendulum clock |
DE2847208C2 (en) * | 1978-10-30 | 1983-11-24 | Siegas Metallwarenfabrik Wilhelm Loh Gmbh & Co Kg, 5900 Siegen | Control circuit for a vibratory electromechanical system |
US4340948A (en) * | 1980-04-24 | 1982-07-20 | General Time Corporation | Single-coil balance wheel for driving a mechanical movement |
WO2001013182A1 (en) * | 1999-08-12 | 2001-02-22 | Seiko Instruments Inc. | Mechanical timepiece with posture detector |
CN1333887A (en) * | 1999-11-11 | 2002-01-30 | 精工电子有限公司 | Mechanical timepiece with timed annular balance rotating angle control mechanism |
DE10349476A1 (en) * | 2003-10-21 | 2005-05-25 | Siemens Ag | Timely execution of a measurement or control action and synchronization of several such actions |
ATE481662T1 (en) | 2004-10-26 | 2010-10-15 | Lvmh Swiss Mft Sa | WRISTWATCH REGULATOR AND MECHANICAL MOVEMENT HAVING SUCH A REGULATOR |
CN102929121A (en) * | 2012-10-30 | 2013-02-13 | 林祥平 | Clock |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3451210A (en) * | 1966-07-01 | 1969-06-24 | Benrus Corp | System for maintaining oscillations in an electric timing mechanism having an oscillatory element |
DE1591218A1 (en) * | 1967-03-09 | 1970-12-17 | Junghans Gmbh Geb | Crystal-controlled transistor oscillator |
CH532280A (en) * | 1969-08-12 | 1972-09-15 | Longines Montres Comp D | Electronic watch |
US3576455A (en) * | 1969-11-05 | 1971-04-27 | Gen Time Corp | Synchronous reluctance motor |
CH613594B (en) * | 1971-05-04 | Ebauches Sa | METHOD OF SYNCHRONIZATION AT AN AVERAGE FREQUENCY F OF THE OSCILLATIONS OF A MECHANICAL RESONATOR OF A TIME-MEASURING INSTRUMENT AND DEVICE FOR IMPLEMENTING THIS PROCESS. | |
CH560925A (en) * | 1971-06-29 | 1975-04-15 | ||
CH612317GA3 (en) * | 1971-09-24 | 1979-07-31 | ||
BE790818A (en) * | 1971-11-01 | 1973-02-15 | Timex Corp | AMPLITUDE CONTROL MEANS FOR BALANCER OSCILLATORS |
BE793821A (en) * | 1972-01-10 | 1973-05-02 | Timex Corp | ELECTRONIC SWITCH FOR WATCHMAKING MOVEMENTS |
DE2210542B2 (en) * | 1972-03-04 | 1974-05-02 | Deutsche Itt Industries Gmbh, 7800 Freiburg | Method and circuit arrangements for synchronizing the balance system of utility watches by means of a quartz oscillator |
-
1973
- 1973-02-24 DE DE19732309291 patent/DE2309291A1/en active Pending
-
1974
- 1974-01-31 US US438157*A patent/US3921386A/en not_active Expired - Lifetime
- 1974-02-21 GB GB795074A patent/GB1463990A/en not_active Expired
- 1974-02-25 JP JP49022250A patent/JPS501776A/ja active Pending
- 1974-02-25 FR FR7406281A patent/FR2262344B3/fr not_active Expired
- 1974-03-27 IT IT7449736A patent/IT1029540B/en active
Also Published As
Publication number | Publication date |
---|---|
DE2309291A1 (en) | 1974-08-29 |
JPS501776A (en) | 1975-01-09 |
IT1029540B (en) | 1979-03-20 |
FR2262344B3 (en) | 1977-01-07 |
US3921386A (en) | 1975-11-25 |
FR2262344A3 (en) | 1975-09-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |