US3608302A - Electromagnetic micromotor for an electronic watch - Google Patents

Electromagnetic micromotor for an electronic watch Download PDF

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Publication number
US3608302A
US3608302A US41181A US3608302DA US3608302A US 3608302 A US3608302 A US 3608302A US 41181 A US41181 A US 41181A US 3608302D A US3608302D A US 3608302DA US 3608302 A US3608302 A US 3608302A
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US
United States
Prior art keywords
ratchet wheel
watch
micromotor
plane
frame
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
US41181A
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English (en)
Inventor
Andre Cachin
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.)
Compagnie des Montres Longines Francillon SA
BERNARD GOLAY SA
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US3608302A publication Critical patent/US3608302A/en
Anticipated expiration legal-status Critical
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
    • G04C3/08—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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
    • H02K7/065—Electromechanical oscillators; Vibrating magnetic drives

Definitions

  • the micromotor comprises an elastic portion connected with an oscillating mass portion carrying an impulse pawl cooperating with a ratchet wheel driving the gear-train of the watch, a stop pawl, cooperating with the same ratchet wheel, being mounted on the frame of the micromotor.
  • the ratchet wheel and the said pawls are situated in a plane perpendicular to the plane of the watch movement and an inclined mirror renders possible the observation of the motion of the said ratchet wheel and of the said pawls through an optical axis perpendicular to the plane of the watch movement.
  • the present invention relates to an electromagnetic micromotor for an electronic watch, vibrating at an acoustical frequency and adapted to 'be controlled by a very stable oscillator, comprising an elastic portion connected with an oscillating mass portion carrying an impulse pawl cooperating with a ratchet wheel driving the gear-train of the watch, a stop pawl, cooperating with the same ratchet wheel, being mounted on the frame of the micromotor.
  • This micromotor is broadly characterized in that the ratchet wheel and the saidpawls are situated in a plane perpendicular to the plane of the Watch movement and that an inclined mirror renders possible the observation of the motion of the said ratchet wheel and of the said pawls through an optical axis at least approximately perpendicular to the plane of the watch movement.
  • the single figure is a perspective view of said embodiment.
  • the micromotor illustrated in the drawing includes a U-shaped frame 1 the base 1a of which is rather massive, whereas its legs 1b and 1c are thinner and present a certain elasticity in a plane parallel to the pillar-plate 25.
  • the elastic portion of the micromotor consists of a plane torsion blade 2, perpendicular to the plane of the watch, the longitudinal axis of said blade being parallel to the plane of the watch.
  • the torsion blade 2 is embedded at its both ends in the legs 1b and 1c of the frame 1 and carries in the middle thereof the mass portion, which is formed by a rigid bar 3, distributed on both sides of the torsion blade 2.
  • a coil 4 and a counterweight 5 are respectively fixed at the ends of the bar 3 in such a manner that a static equilibrium is obtained about the axis of the torsion blade 2.
  • the coil 4 is electromagnetically connected with a stationary magnetic circuit consisting of a pair of permanent magnets 6 and two pairs of polar pieces 7, 8.
  • This electromagnetic device which does not belong to the invention, is controlled by a very stable oscillator, for instance a quartz oscillator.
  • the bar 3 carries an impulse pawl 9' cooperating with a ratchet wheel 10 the shaft 11 of which is pivoted between two small plates 12; the shaft 11 carries a worm 13 which is in mesh with the first wheel 14 of the gear-train of the watch.
  • the reference numeral 15 denotes the trainbridge and 25 the pillar-plate of the watch, the frame 1 being mounted on said pillar-plate 25.
  • the micro motor forms a sub-assembly of the-watch, situated at least partially above the gear-train of the watch.
  • the leg 1b of the frame 1 has an inner flange 16 above which is placed a plate 17 made integral with a blade 18 which is fixed to the base 1a of the frame 1.
  • the blade 18 is resilient in two planes which are respectively parallel and perpendicular to the pillar-plate 25 and tends, on the one hand, to lift the plate 17 away from the flange 16, but this is prevented by a screw 19 screwed in the flange 16 and bearing on the upper face of the plate 17, said screw 19 thus maintaining the parts 16 and 17 spaced from each other.
  • an eccentric 20, driven into the flange 16 and whose head is accommodated within an elongated opening 21 of the plate 17, enables the user to slightly displace the plate 17 in a direction transverse to the bar 3.
  • An extension 22 of the plate 17 carries a stop pawl 23 cooperating with the ratchet wheel 10.
  • this mirror 24 it is possible to observe the motion of the ratchet wheel 10 and of the pawls 9 and 23, which are situated in a plane perpendicular to the plane of the watch movement, through an optical axis perpendicular to the plane of the watch movement.
  • the provision of the mirror 24 facilitates the adjusting of the the stop pawl 23 and permits an easy checking of the operation.
  • the operation of the micromotor as illustrated is easily understood with the help of the foregoing description.
  • the bar 3 begins to oscillate at an acoustical frequency and the torsion blade 2 acts as a drawback elastic member.
  • the impulse pawl 9, fixed to the bar 3 advances step by step the ratchet wheel 10 and the latter, through the intermediary of the worm 13, drives the wheel 14 of the gear-train of the watch.
  • An electromagnetic micromotor for an electronic watch adapted to be controlled by a very stable oscillator and having a watch movement including a gear train, comprising a frame, a ratchet wheel mounted on said frame in driving relation with the watch movements gear train, an elastic portion mounted on said frame and connected with an oscillatable mass carrying an impulse pawl cooperating with said ratchet wheel, a stop pawl mounted on said frame and engageable with said ratchet wheel, an inclined mirror mounted on said frame, said ratchet wheel and said pawls being situated in a plane perpendicular to the plane of the watch movement, said inclined mirror enabling the observation of the motion of said ratchet wheel and said pawls through an optical axis at least approximately perpendicular to the plane of the watch movement.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Electric Clocks (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
US41181A 1969-06-13 1970-05-28 Electromagnetic micromotor for an electronic watch Expired - Lifetime US3608302A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH904569A CH514872A (fr) 1969-06-13 1969-06-13 Montre électronique comprenant un moteur électromagnétique

Publications (1)

Publication Number Publication Date
US3608302A true US3608302A (en) 1971-09-28

Family

ID=4347716

Family Applications (1)

Application Number Title Priority Date Filing Date
US41181A Expired - Lifetime US3608302A (en) 1969-06-13 1970-05-28 Electromagnetic micromotor for an electronic watch

Country Status (5)

Country Link
US (1) US3608302A (en, 2012)
CH (2) CH904569A4 (en, 2012)
DE (1) DE2027554B2 (en, 2012)
FR (1) FR2046735B1 (en, 2012)
GB (1) GB1295104A (en, 2012)

Also Published As

Publication number Publication date
DE2027554B2 (de) 1972-07-13
FR2046735B1 (en, 2012) 1974-03-15
CH514872A (fr) 1971-07-15
FR2046735A1 (en, 2012) 1971-03-12
GB1295104A (en, 2012) 1972-11-01
DE2027554A1 (en, 2012) 1970-12-17
CH904569A4 (en, 2012) 1971-07-15

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