US3708974A - Pallet attracting construction - Google Patents

Pallet attracting construction Download PDF

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Publication number
US3708974A
US3708974A US00212360A US3708974DA US3708974A US 3708974 A US3708974 A US 3708974A US 00212360 A US00212360 A US 00212360A US 3708974D A US3708974D A US 3708974DA US 3708974 A US3708974 A US 3708974A
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US
United States
Prior art keywords
pallet
attracting
magnet
balance wheel
construction
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
US00212360A
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English (en)
Inventor
M Fujimori
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
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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
Application granted granted Critical
Publication of US3708974A publication Critical patent/US3708974A/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • G04C3/04—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 balance
    • 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
    • G04B15/00—Escapements
    • G04B15/12—Adjusting; Restricting the amplitude of the lever or the like
    • 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
    • Y10T74/1502—Escapement

Definitions

  • the present invention relates to pallet attracting constructions for incorporation in electric timepieces.
  • the driving torque passes through a gear train with its speed reduced, and is then appliedto an escape wheel and pallet.
  • a turning torque is applied thereto in a predetermined direction due to the geometrical relation with the escape wheel.
  • the pallet is brought to a standstill at fixed positions by occasional contact with a base plate or pallet supporter. This action, called attraction, prevents the pallet from contacting with the balance wheel at the vibrating seat of said balance wheel or vibrating weight, so as to eliminate the adverse affect on the accuracy of time keeping which would result should the pallet remain in contact with the balance wheel at that time.
  • a pallet attracting construction for an electric timepiece including a balance wheel pivotably mounted on a balance bearing'for cooperation with a pivotably'mounted pallet.
  • a C-shaped permanent magnet is rotatably mounted in the region of said balance bearing, the ends of said permanent magnet being substantially aligned with the opposed ends of a slot in the base plate of the timepiece, which base plate also serves to support said balance hearing.
  • a member formed of magnetic material is mounted on said pallet for projecting through said slot for cooperation with the ends of said permanent magnet to provide attracting force to said pallet.
  • one object of the pallet attracting construction according to the invention is to provide an arrangement for applying attracting force to the pallet of an electric timepiece without adversely affecting the time keeping, size or other characteristics of said timepiece.
  • FIGS. 1 and 2 are schematic plan views of two prior art ,palletattracting constructions
  • FIG. 3 is a fragmentary cross-sectional view of a pallet attracting construction according to the invention.
  • FIG. 4 is a top plan view of the pallet attracting construction of FIG. 3.
  • the prior art pallet attracting construction depicted includes a pallet fork 4 fixedly mounted on pallet staff I, which in turn is pivotably mounted within the timepiece to permit the pivotable displacement of said pallet fork.
  • Said pallet fork is provided with a pair of pallet jewels 2 and 3 for cooperative engagement with the gear train of the timepiece for driving said gear train.
  • An attracting pin 5 formed of magnetic material ismounted on the lever portion of said pallet fork, while a pair of spaced attracting magnets are mounted on opposed sides of said lever portion of said pallet fork in said timepiece.
  • FIG. 2 A second prior art pallet attracting construction is depicted in FIG. 2, wherein pallet fork 4' is fixedly mounted on pallet staff *1 ,for pivotable rotation therewith within the timepiece. Again, jewels 2 and 3 are mounted on said pallet fork for cooperative engagement with the timepiece gear train for driving said'gear train.
  • an attracting member 7 formed of a magnetic material is mounted on pallet staff 1. Saidattracting member is formed with a pair of spaced projecting portions so that said member is, itself, in the nature of a pallet.
  • a permanent magnet 6 is mounted in the timepiece intermediate saidprojecting portions of attracting member 7 and positioned so that when the reciprocating swing motion of pallet fork 4 is stopped, attracting magnet 6 is spaced a predetermined small interval from one of the projecting portions of attracting member 7 so as to apply magnetic attraction force to the pallet fork through said attracting member and pallet staff.
  • At least one attracting magnet is positioned beneath and adjacent the pallet and the motor driving the timepiece.
  • Said motor generally includes a balance wheel and permanent magnets which cooperate with driving coils for converting electrical energy to mechanical rotative energy for driving the timepiece by sustaining the oscillation of the balance wheel.
  • permanent magnets 6 when permanent magnets 6 are positioned as described above, the magnetic flux emanating therefrom combined with the leakage flux from the driving magnets of said motor or acts on balance wheels formed from magnetic material to impede the oscillation of the balance wheel. This disturbance of the vibrational period adversely affects time keeping accuracy.
  • the magnetic coupling between the driving motor and attracting magnet 6 in the conventional timepieces is caused in part, by the constraints applied in designing said motor.
  • the members acting on the motor are generally concentrically disposed about the balance wheel and the flux density in the magnetic circuit of the motor is generally maximum in the longitudinal direction of the movement of said balance wheel. Since the sides of the motor generally determines the thickness of the movement, the space between the respective members acting on the motor is generally minimized.
  • a magnetism shielding member formed of magnetic material should be provided between permanent magnets 6 and the driving motor.
  • a shielding member increases the thickness of the movement, thereby reducing the marketability of the timepiece, and in particular, of Wristwatches.
  • the special materials required for the shielding member increases both material and labor costs, thereby increasing the cost of the timepiece,
  • a further defect in-the prior art arrangements arises from the fact that the release from attraction between the pallet and the permanent magnets is achieved by the engagement of the balance wheel against the pallet fork.
  • the intensity of the attraction force in each direction depends on the composition of the attracting magnetic material, the attracting intensity, the material of the attracting pin or member, and the clearance between the attracting magnet and the attracting pin or member.
  • a bridge or plate support member 16 carries a shock absorbing bearing frame 17 which provides one of two pivotable supports for the balance wheel.
  • Support 16 also supports one end of pallet staff 11, pallet fork 14 being fixedly mounted on said pallet staff.
  • a pair of pallet jewels l2 and 13 are mounted on pallet fork 14. Also mounted on said pallet fork is an attracting pin 15 formed of magnetic material, said pin being mounted on the lever portion of said pallet fork.
  • a C-shaped attracting magnet 18 is rotatably mounted on bearing frame 17. Said permanent magnet is provided with a pair of projecting tabs to permit the rotatable positioning thereof relative to a longitudinally extending slot 19 formed in support 16. Pin 15 projects through slot 19, said attracting magnet being dimen-v sioned so that the ends 20 thereof may be selectively positioned relative to the ends of slot 19. The ends of said slot serve to limit the .pivotable oscillatory displacement of pallet fork 14 due to the engagement thereagainst of pin 15. The attraction force is applied to pin 15 by the ends 20 of attracting magnet 18 when said pin is positioned at the ends of slot 19.
  • attracting magnet 18. is positioned in parallel to and concentricwith the motor and balance wheel.
  • a closed magnetic loop is defined by said attracting magnet which incorporates attracting pin 5.
  • said attracting magnet is structurally separated from the motor so that no complicated magnetic shield is required, leakage flux is decreased, and magnetic coupling between said attracting magnet and the motor is minimized. Accordingly, the adverse affect on the vibrational period of the balance wheel is diminished, and time accuracy may be stabilized. Since an additional magnet and shield member is not required, the thickness of-the movement may be minimized.
  • the attraction of the pallet can be balanced and measurement of time for the purposes of adjustment can be readily performed by means of a vibrograph. Further, the measurement of the intensity of attraction of the pallet may be measured in the arrangement of FIGS. 3 and 4, so that it is possible to design the arrangement for optimum attraction, thereby further enhancing stability and accuracy of the timepiece.
  • the attracting magnet may be made larger in size than was possible with regard to the magnet 6 of the embodiments of FIGS. 1 and 2, material of relatively low magnetic flux density can be used, thereby reducing material and manufacturing costs. Since the attracting magnet is spaced from the gear train, the magnetic force thereof has no adverse affect on said gear train.
  • the arrangement according to the invention utilizes the ends of slot 19 to define the limits of pivotable oscillation of the pallet fork 14 by engagement by attracting pin 5.
  • the arrangement according to the invention can also be formed utilizing a separate structure for limiting the pivotable displacement of the pallet fork, while still incorporating the arrangement accord ing to the invention of providing a rotatable attraction magnet for the adjustment of attraction force.
  • a pallet attracting construction for an electric timepiece comprising a support plate; a balance wheel pivotably mounted on one side of said plate at a point thereon; a pivotably mounted pallet operatively coupled to said balance wheel fordisplacement in response to the oscillation of said balance wheel; an attracting member mounted on said pallet and projecting toward said support plate, said support plate being formed with an elongated slot therethrough for receiving said attracting member during the pivotable displacement of said pallet; and a C-shaped attracting magnet mounted for selective rotation on the side of said plate opposed from said balance wheel in the region of the point of mounting of said balance wheel, said attracting magnet and said slot being positioned so that the ends of said attracting magnet are in substantial alignment with the ends of said elongated slot for applying an attracting force to said attracting member at the extremes of pivotable displacement of said pallet.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
US00212360A 1970-12-28 1971-12-27 Pallet attracting construction Expired - Lifetime US3708974A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1970132716U JPS5025188Y1 (US07282526-20071016-C00003.png) 1970-12-28 1970-12-28

Publications (1)

Publication Number Publication Date
US3708974A true US3708974A (en) 1973-01-09

Family

ID=15087895

Family Applications (1)

Application Number Title Priority Date Filing Date
US00212360A Expired - Lifetime US3708974A (en) 1970-12-28 1971-12-27 Pallet attracting construction

Country Status (6)

Country Link
US (1) US3708974A (US07282526-20071016-C00003.png)
JP (1) JPS5025188Y1 (US07282526-20071016-C00003.png)
CH (2) CH1898271A4 (US07282526-20071016-C00003.png)
DE (1) DE2165083C3 (US07282526-20071016-C00003.png)
FR (1) FR2120057B1 (US07282526-20071016-C00003.png)
GB (1) GB1359743A (US07282526-20071016-C00003.png)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3859784A (en) * 1972-12-28 1975-01-14 Ebauches Sa Electric watch with electrodynamic motor
US3899700A (en) * 1974-09-03 1975-08-12 Timex Corp Indexing mechanism for electric watch
US3956941A (en) * 1974-01-18 1976-05-18 Les Fabriques D'assortments Reunies Escapement-type drive mechanism for watches and the like
US20030112709A1 (en) * 2001-12-15 2003-06-19 Richemont International S.A. Constant-force device
US20180004165A1 (en) * 2016-07-01 2018-01-04 Montres Breguet S.A. Timepiece comprising a device for switching a mechanism of said timepiece
CN114675520A (zh) * 2020-12-24 2022-06-28 宝玑表有限公司 包括旋转表圈的时计

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1645918A1 (fr) * 2004-10-05 2006-04-12 Montres Breguet S.A. Dispositif anti-galop pour échappement d'horlogerie

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2061047A (en) * 1932-12-17 1936-11-17 Jr Edmund O Schweitzer Timepiece
US2971324A (en) * 1957-03-16 1961-02-14 Ebauches Sa Lever escapement for timepieces
US3026458A (en) * 1957-07-11 1962-03-20 Siemens Ag Electric clock drive
US3059413A (en) * 1959-01-02 1962-10-23 Hamilton Watch Co Pallet fork contacting and indexing means for electric watch
US3122879A (en) * 1959-10-01 1964-03-03 Trick Kuno Motion converter for electrically driven rotary oscillators
US3187126A (en) * 1962-06-28 1965-06-01 Cons Electronics Ind Chronometric governor
US3611707A (en) * 1968-11-21 1971-10-12 Messrs Gebruder Jungshans Gmbh Continuous-switching device for advancing the wheel mechanism of an electric clock

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2061047A (en) * 1932-12-17 1936-11-17 Jr Edmund O Schweitzer Timepiece
US2971324A (en) * 1957-03-16 1961-02-14 Ebauches Sa Lever escapement for timepieces
US3026458A (en) * 1957-07-11 1962-03-20 Siemens Ag Electric clock drive
US3059413A (en) * 1959-01-02 1962-10-23 Hamilton Watch Co Pallet fork contacting and indexing means for electric watch
US3122879A (en) * 1959-10-01 1964-03-03 Trick Kuno Motion converter for electrically driven rotary oscillators
US3187126A (en) * 1962-06-28 1965-06-01 Cons Electronics Ind Chronometric governor
US3611707A (en) * 1968-11-21 1971-10-12 Messrs Gebruder Jungshans Gmbh Continuous-switching device for advancing the wheel mechanism of an electric clock

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3859784A (en) * 1972-12-28 1975-01-14 Ebauches Sa Electric watch with electrodynamic motor
US3956941A (en) * 1974-01-18 1976-05-18 Les Fabriques D'assortments Reunies Escapement-type drive mechanism for watches and the like
US3899700A (en) * 1974-09-03 1975-08-12 Timex Corp Indexing mechanism for electric watch
US20030112709A1 (en) * 2001-12-15 2003-06-19 Richemont International S.A. Constant-force device
US6863434B2 (en) * 2001-12-15 2005-03-08 Richemont International S.A. Constant-force device
US20180004165A1 (en) * 2016-07-01 2018-01-04 Montres Breguet S.A. Timepiece comprising a device for switching a mechanism of said timepiece
US10078310B2 (en) * 2016-07-01 2018-09-18 Montres Breguet S.A. Timepiece comprising a device for switching a mechanism of said timepiece
CN114675520A (zh) * 2020-12-24 2022-06-28 宝玑表有限公司 包括旋转表圈的时计

Also Published As

Publication number Publication date
DE2165083C3 (de) 1974-08-29
DE2165083B2 (de) 1974-02-07
FR2120057A1 (US07282526-20071016-C00003.png) 1972-08-11
GB1359743A (en) 1974-07-10
FR2120057B1 (US07282526-20071016-C00003.png) 1975-02-21
CH1898271A4 (US07282526-20071016-C00003.png) 1975-12-15
CH575621B5 (US07282526-20071016-C00003.png) 1976-05-14
DE2165083A1 (de) 1972-07-20
JPS5025188Y1 (US07282526-20071016-C00003.png) 1975-07-29

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