US3783608A - Indexing device for a step motor in an electronic timepiece - Google Patents

Indexing device for a step motor in an electronic timepiece Download PDF

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Publication number
US3783608A
US3783608A US00226586A US3783608DA US3783608A US 3783608 A US3783608 A US 3783608A US 00226586 A US00226586 A US 00226586A US 3783608D A US3783608D A US 3783608DA US 3783608 A US3783608 A US 3783608A
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US
United States
Prior art keywords
spring
index
rotor
index wheel
wheel
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
Application number
US00226586A
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English (en)
Inventor
H Miyazawa
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.)
Suwa Seikosha KK
Original Assignee
Suwa Seikosha KK
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 Suwa Seikosha KK filed Critical Suwa Seikosha KK
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Publication of US3783608A publication Critical patent/US3783608A/en
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Expired - Lifetime legal-status Critical Current

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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
    • G04C3/16—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating an electro-dynamic continuously rotating motor
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C13/00—Driving mechanisms for clocks by primary clocks
    • G04C13/08—Secondary clocks actuated intermittently
    • G04C13/10—Secondary clocks actuated intermittently by electromechanical step advancing mechanisms
    • G04C13/11—Secondary clocks actuated intermittently by electromechanical step advancing mechanisms with rotating armature

Definitions

  • the engaging pressure of the index spring with the index wheel in known constructions can be either decreased or made larger. If decreased, this makes the indexing of the indexing wheel uncertain, while if the engaging pressure is increased, this induces a larger frictional loss.
  • the aforesaid jewel has a surface of engagement with said index wheel and a distal extremity relative to said surface, said spring engaging said distal extemity.
  • FIG. 1 is a plan view of a known step motor which divides and synchronizes an electric signal and which uses a crystal oscillator (not shown) as its standard.
  • the structure in FIG. 1 includes a rotor l, a rotor pinion 2, a second toothed wheel 3 engaged with the pinion 2, a stator 4-4a, an index spring 5, and a lever body 7 which is adapted to pivot on a pin 9 secured to a rotor supporter 123.
  • the pin 9 is preferably arranged in proximity of an imaginary straight line passing through the center of second wheel 3 and the zone of engagement between the second wheel (which serves as an index wheel) and the index spring 5.
  • F is the direction of counter torque which acts opposite the direction of the index wheel.
  • 5a indicates the bending condition of the flexible lever or spring 5 caused bythecounter torque F.
  • 6 is the angle between the direction Q of the flexible lever and the direction P of the tangent which touches the tooth surface of the index wheel at a point of contact with the head of the flexible lever portion.
  • the invention provides generally an indexing device for an electronic timepiece, which device comprises a rotor, means to rotate said rotor incrementally, a pinion rotatable with said rotor, an index wheel engaged with and rotated by said pinion, an index spring adjacent said index wheel, and a pallet jewel on said spring and in engagement with said index wheel to prevent reverse rotation and vibration of the index wheel.
  • An indexing device as claimed in claim 1 wherein said pallet jewel engages one tooth at a time, an angle 6 being formed between a tangent touching said one tooth at the point of contact thereof with said pallet jewel, and said flexible lever, said angle 0 being not more than 90 to prevent reverse rotation and vibration of said index wheel.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
US00226586A 1971-02-17 1972-02-15 Indexing device for a step motor in an electronic timepiece Expired - Lifetime US3783608A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP842871 1971-02-17

Publications (1)

Publication Number Publication Date
US3783608A true US3783608A (en) 1974-01-08

Family

ID=11692839

Family Applications (1)

Application Number Title Priority Date Filing Date
US00226586A Expired - Lifetime US3783608A (en) 1971-02-17 1972-02-15 Indexing device for a step motor in an electronic timepiece

Country Status (5)

Country Link
US (1) US3783608A (enExample)
DE (1) DE2207467C3 (enExample)
FR (1) FR2125542B1 (enExample)
GB (1) GB1343223A (enExample)
HK (1) HK40176A (enExample)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3922845A (en) * 1973-05-15 1975-12-02 Citizen Watch Co Ltd Watch drive pulse motor
US3934404A (en) * 1973-11-17 1976-01-27 Kabushiki Kaisha Daini Seikosha Second hand regulating mechanism
US3991556A (en) * 1974-06-12 1976-11-16 Societe Jaz S.A. Clock or watch movement
US4104859A (en) * 1975-05-14 1978-08-08 Seiko Koki Kabushiki Kaisha Reversal preventing device of electric clock
US4177630A (en) * 1977-10-25 1979-12-11 Bunker Ramo Corporation Sweep seconds to jump seconds conversion for clocks
US4408898A (en) * 1979-11-16 1983-10-11 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Positioning mechanism for a center wheel

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3059500A (en) * 1959-09-12 1962-10-23 Ebauches Sa Pawl and ratchet device
US3129554A (en) * 1961-03-06 1964-04-21 Suwa Seikosha Kk Electric timekeeper
US3201932A (en) * 1964-07-10 1965-08-24 United States Time Corp Vibratory frequency standard for a timekeeping device
US3540206A (en) * 1965-07-29 1970-11-17 Max Hetzel Motion transforming device for electronic timepieces and the like
US3597915A (en) * 1968-11-05 1971-08-10 Susumu Aizawa Driving device of electronic watch
US3616636A (en) * 1969-03-17 1971-11-02 Ebauches Sa Electric timepiece
US3616637A (en) * 1969-03-17 1971-11-02 Ebauches Sa Electric timepiece

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH390799A (fr) * 1963-07-16 1965-08-13 Omega Louis Brandt & Freres S Mécanisme de transmission de mouvement
DE1809223B2 (de) * 1968-11-15 1972-11-30 Gebrüder Junghans GmbH, 7230 Schramberg Armbanduhr mit einem piezoelektrischen kristall als zeithaltendem schwinger

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3059500A (en) * 1959-09-12 1962-10-23 Ebauches Sa Pawl and ratchet device
US3129554A (en) * 1961-03-06 1964-04-21 Suwa Seikosha Kk Electric timekeeper
US3201932A (en) * 1964-07-10 1965-08-24 United States Time Corp Vibratory frequency standard for a timekeeping device
US3540206A (en) * 1965-07-29 1970-11-17 Max Hetzel Motion transforming device for electronic timepieces and the like
US3597915A (en) * 1968-11-05 1971-08-10 Susumu Aizawa Driving device of electronic watch
US3616636A (en) * 1969-03-17 1971-11-02 Ebauches Sa Electric timepiece
US3616637A (en) * 1969-03-17 1971-11-02 Ebauches Sa Electric timepiece

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3922845A (en) * 1973-05-15 1975-12-02 Citizen Watch Co Ltd Watch drive pulse motor
US3934404A (en) * 1973-11-17 1976-01-27 Kabushiki Kaisha Daini Seikosha Second hand regulating mechanism
US3991556A (en) * 1974-06-12 1976-11-16 Societe Jaz S.A. Clock or watch movement
US4104859A (en) * 1975-05-14 1978-08-08 Seiko Koki Kabushiki Kaisha Reversal preventing device of electric clock
US4177630A (en) * 1977-10-25 1979-12-11 Bunker Ramo Corporation Sweep seconds to jump seconds conversion for clocks
US4408898A (en) * 1979-11-16 1983-10-11 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Positioning mechanism for a center wheel

Also Published As

Publication number Publication date
FR2125542B1 (enExample) 1977-04-01
DE2207467B2 (de) 1980-01-10
GB1343223A (en) 1974-01-10
HK40176A (en) 1976-07-09
DE2207467C3 (de) 1984-07-05
FR2125542A1 (enExample) 1972-09-29
DE2207467A1 (de) 1972-09-07

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