US3446006A - Pawl adjustment means in an electronic timepiece - Google Patents

Pawl adjustment means in an electronic timepiece Download PDF

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Publication number
US3446006A
US3446006A US651208A US3446006DA US3446006A US 3446006 A US3446006 A US 3446006A US 651208 A US651208 A US 651208A US 3446006D A US3446006D A US 3446006DA US 3446006 A US3446006 A US 3446006A
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US
United States
Prior art keywords
pawl
support
driving
ratchet wheel
pawls
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
US651208A
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English (en)
Inventor
Remy Frossard
Max Hetzel
Henri Robert
Henri Haring
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.)
Centre Electronique Horloger SA
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Centre Electronique Horloger SA
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 Centre Electronique Horloger SA filed Critical Centre Electronique Horloger SA
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Publication of US3446006A publication Critical patent/US3446006A/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
    • G04C3/08—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
    • G04B11/02—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

Definitions

  • the invention has for its object an electronic timepiece the time standard of which and the driving motor of which are constituted by a mechanical resonator electrically maintained and driving a ratchet wheel by means of a driving pawl rigid with the resonator, a return pawl preventing the rotation of the ratchet wheel in the opposite direction.
  • the timepiece according to the invention is characterized by the fact that it comprises means for adjusting the pressure with which the driving pawl acts with the ratchet wheel, means for adjusting the pressure with which the return pawl acts on the ratchet wheel and means for placing into phase the beaks of the driving and return pawls.
  • FIGURE 1 shows a first modification in which part of the adjustment occurs by elastic deformation.
  • FIGURE 2 shows a second modification in which a part of the adjustment occurs by plastic deformation.
  • FIGURE 1 is partially shown an electronic timepiece movement comprising essentially a resonator 1 secured by its foot In on a plate 2.
  • the resonator comprises two branches 1b and whose movements are electrically maintained by means of transducers not shown.
  • Branch 1b has a driving pawl 3 which is not directly encased in the branch of the resonator but in a small rectangular bar 4 secured on the resonator by means of a pin 5 located at one of the extremities of bar 4 in order to be able to move rotationally under the action of the lateral force exerted on the free extremity of bar 4.
  • Driving pawl 3 engages in the teeth of a ratchet wheel 6 the pinion of which 7 is constituted by a magnetized polar wheel driving magnetically a magnetic wheel 8, the pinion of which, 9, meshes with a first intermediate wheel 10 driving the rest of the gears of the movement.
  • Wheels 6 and 8 are pivoted in an auxiliary cage formed by two bridges 11 and 12 secured respectively on the upper and lower surface of foot 112 of the resonator.
  • the mounting of the pawls permits to efiect three adjustments: the adjustment of the pressure of the spring of the driving pawl, the adjustment of the pressure of the spring of the return pawl and the putting into phase of the beaks of the driving and return pawls.
  • Adjustment 0 the pressure of the spring of the driving pawl
  • This adjustment takes place by making bar 4 pivot around its pivot 5 by means of a suitable tool 23, shown Adjustment of the pressure of the spring of the return pawl
  • This adjustment is obtained by varying the arrow of the spring of pawl 14 by the angular movement of its encasing point.
  • the fine adjustment of this movement is ensured by the elastic deformation of the narrowed section 21 of branch 20 of support 13 by means of screw 22, the head of which bears against branch 20 and the threaded part of which is screwed in the rigid body of support 13.
  • the position of the inflexion point of the flexible part 21 is such that the trajectory described by the beak of the pawl under the effect of the movement of the encasing point of its spring comes as near as possible to normal to the point of contact with the wheel.
  • Support 25 of return pawl 14 is here rigidly secured its base 26 to the upper bridge 11 of the auxiliary cage by two screws 27 and 28.
  • Support 25 comprises essentially two parts 29 and 30, part 29 being connected to foot 26 by a diminished section 31, while part 30 is connected to part 29 by a diminished section 32.
  • Return pawl 14 is encased forming an elbow in part 30.
  • Parts 29 and 30 also have an elongated slot 33, respectively 34, permitting the introduction of a tool which by rotation permits to deform plastically the support around an inflexion point located respectively in diminished sections 31 and 32.
  • the upper bridge 11 has further more an opening per mitting to introduce vertically a tool in slot 33.
  • FIGURES 1 and 2 naturally only show two typical types of adjustment by elastic deformation of the material. The important thing is to avoid adjustments by relative movement of two independent pieces one with respect to the other, movements which, even if made with the aid of a micrometer screw, would not give a sufiicient accuracy.
  • FIGURE 1 there is provided a half moon-shaped porthole 35 through which it is possible to observe the teeth of rachet wheel 6.
  • Electronic timepiece having a time base and a driving member constituted by a mechanical resonator electrically upkept, said resonator having a driving pawl, a ratchet wheel driven in a given direction by said driving pawl, a retaining pawl preventing rotation of said rachet wheel in a direction opposite to said given direction, means for regulating the pressure of said driving pawl on said ratchet wheel, means for adjusting the pressure of said retaining pawl on said ratchet wheel and means for putting into phase said driving .and said retaining pawls.
  • Timepiece according to claim 1, wherein said means for adjusting the pressure of said driving pawl consist of a lever, said lever being secured to said resonator and carrying said driving pawl, and an opening in said resonator near said arm, for inserting a key serving to angularly move said lever so as to modify the tension of a spring associated with said pawl.
  • Timepiece according to claim 1, wherein said means for adjusting the pressure of said retaining pawl consist of an elastically deformable support for said retaining pawl.
  • Timepiece according to claim 1, wherein said means for adjusting the pressure of said retaining pawl consist of a plastically deformable support for said pawl.
  • Timepiece according to claim 3 wherein said pawl has a beak and said support for said pawl has an inflexion point during deformation such that said beak has a trajectory at least approximately perpendicular to said rachet wheel.
  • Timepiece according to claim 3 wherein said support for said retaining pawl has an elastic slot, whereby the parts of said support located on either side of said slot can be brought near each other by means of an adjusting screw.
  • said means for replacing said pawls in phase consist of an elastically deformable support for said retaining pawl, said support having an arm with an extremity bearing a fixed point, and a middle part bent by means of a screw, and another fixed point where said support is fixed, this point being at least approximately on an extension of a diameter passing on the leading edge of the retaining pawl and the centre of said ratchet wheel.
  • timepiece according to claim 1, wherein said means for placing in phase said pawls consists of a plastically deformable support for said retaining pawl, said support being pivotalble about an inflexion point located at least approximately on an extension of a diameter passing by the leading edge of said retaining pawl and the centre of said ratchet wheel.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Transmission Devices (AREA)
  • Electromechanical Clocks (AREA)
US651208A 1966-07-27 1967-07-05 Pawl adjustment means in an electronic timepiece Expired - Lifetime US3446006A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1086066A CH506823A (fr) 1966-07-27 1966-07-27 Pièce d'horlogerie comportant un résonateur mécanique

Publications (1)

Publication Number Publication Date
US3446006A true US3446006A (en) 1969-05-27

Family

ID=4367583

Family Applications (1)

Application Number Title Priority Date Filing Date
US651208A Expired - Lifetime US3446006A (en) 1966-07-27 1967-07-05 Pawl adjustment means in an electronic timepiece

Country Status (7)

Country Link
US (1) US3446006A (enrdf_load_stackoverflow)
AT (1) AT285463B (enrdf_load_stackoverflow)
BE (1) BE701203A (enrdf_load_stackoverflow)
CH (2) CH1086066A4 (enrdf_load_stackoverflow)
DE (1) DE1673729A1 (enrdf_load_stackoverflow)
GB (1) GB1121419A (enrdf_load_stackoverflow)
NL (1) NL6709084A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3540205A (en) * 1967-08-22 1970-11-17 Centre Electron Horloger Pawl-ratchet wheel assembly in a timepiece

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH508909A (fr) * 1969-03-17 1971-02-26 Ebauches Sa Pièce d'horlogerie électrique

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2177367A (en) * 1929-05-16 1939-10-24 Central Scientific Co Impulse counter and stop watch timer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2177367A (en) * 1929-05-16 1939-10-24 Central Scientific Co Impulse counter and stop watch timer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3540205A (en) * 1967-08-22 1970-11-17 Centre Electron Horloger Pawl-ratchet wheel assembly in a timepiece

Also Published As

Publication number Publication date
DE1673729A1 (de) 1971-02-25
NL6709084A (enrdf_load_stackoverflow) 1968-01-29
CH1086066A4 (enrdf_load_stackoverflow) 1970-12-31
BE701203A (enrdf_load_stackoverflow) 1967-12-18
AT285463B (de) 1970-10-27
CH506823A (fr) 1970-12-31
GB1121419A (en) 1968-07-24

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