US3851385A - Method of adjusting the frequency of transverse vibrators having a plurality of legs - Google Patents

Method of adjusting the frequency of transverse vibrators having a plurality of legs Download PDF

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Publication number
US3851385A
US3851385A US00318570A US31857072A US3851385A US 3851385 A US3851385 A US 3851385A US 00318570 A US00318570 A US 00318570A US 31857072 A US31857072 A US 31857072A US 3851385 A US3851385 A US 3851385A
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US
United States
Prior art keywords
frequency
vibrator
legs
foot portion
removal
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
US00318570A
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English (en)
Inventor
A Meisner
W Spitzl
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.)
Diehl Verwaltungs Stiftung
Original Assignee
Diehl GmbH and Co
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Filing date
Publication date
Application filed by Diehl GmbH and Co filed Critical Diehl GmbH and Co
Priority to US00352860A priority Critical patent/US3810735A/en
Application granted granted Critical
Publication of US3851385A publication Critical patent/US3851385A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D3/00—Watchmakers' or watch-repairers' machines or tools for working materials
    • G04D3/0002—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe
    • G04D3/0035—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe for components of the regulating mechanism
    • G04D3/0038—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe for components of the regulating mechanism for balances
    • 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
    • G04C3/107—Controlling frequency or amplitude of the oscillating system
    • 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
    • Y10T29/00—Metal working
    • Y10T29/42—Piezoelectric device making
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49004—Electrical device making including measuring or testing of device or component part
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4957—Sound device making

Definitions

  • the invention relates to a method of and tool for equalizing the frequency and/or frequency symmetry of multileg transverse vibrators, especially of a two-legged flat fork vibrator to be employed as frequency normal and/or driving element for time-keeping devices.
  • Time-keeping devices have become known according to which a frequency normal and driving element is formed by a mechanical vibrator which consists of a twoor more-legged flat fork, the legs of which are connected at one end, i.e. at the foot end, to each other and to a framework of the device.
  • the other, free ends of the legs carry masses, for instance a permanent magnet which for generating oscillations cooperates with a transistor-controlled coil of an electronic circuit, while means are provided for driving an indicating device.
  • a vibrator or oscillator of this type and driving and output elements associated therewith are illustrated and disclosed for instance in German Offenlegungsschriften 1,773,678 and l,922,640.
  • an object of the present invention to provide an equalizing method which will be suitable for mass production and which can be automated to a major extent.
  • FIG. 1 is a side view of a flat fork vibrator input and output device, which vibrator has been equalized in conformity with the method of the present invention.
  • FIG. 3 is a front view of an equalizing tool formed by a two-punch punching tool.
  • FIG. 4 is a section taken along the line IVIV of FIG. 3 and shows a section through the tool and a view of the inserted vibrator in starting position.
  • a reduction of the material corresponding to the difference between the starting frequency and the rated frequency is carried out at the foot point of the vibrator leg and, more specifically, at the outer edge thereof approximately within the region of the lowest density of the spring tension lines. This is effected by material removal progressing from a lateral notching of the vibrator legs in the direction toward the ends of the legs.
  • the creation of the symmetry (right-hand fork to left-hand fork) of the leg frequency is obtainable by lateral preadjustment of the depth of removal, whereas the common reduction in frequency of both legs is obtainable by a longitudinal removal on the vibrator by displacement of the vibrator relative to the material removing tool acting at both sides on the edges of the vibrator.
  • the difference in frequency between the two vibrator legs serves as measurement for the lateral adjustment while the difference in frequency of the total vibrator from the rated frequency serves as measurement for the decrease in the spring tension due to the removal of material.
  • the removal of material may be effected by progressive punching off of the leg edges from a base constriction in the fork foot in the direction toward the leg ends.
  • the above mentioned equalization method makes it possible to ascertain the reduction in the spring tension to be effected on both sides and also permits of precisely carrying out of said last mentioned decrease in the spring tension by a simple removal of material in a region poor in the spring tension lines. Inasmuch as the tension occurring in the material during the punching off operation extends likewise only to the marginal zone which is low in spring tension lines, an equalization by postheating or the like will not be necessary.
  • FIG. 1 illustrates a frame 7 for the timekeeping device.
  • a flat fork vibrator l is connected to the frame 7.
  • the vibrator comprises a connecting flap 4 which by a notched lateral constriction 5 is separated from a fork foot 3 where the legs 8 and 9 of the vibrator 1 end.
  • the head end of leg 8 has connected thereto a mass in the form of a U-shaped frame 10 which is standing on edge or upright and by means of a plate 11 is connected to said leg 8.
  • the leg 9 is provided with a cylindrical permanent magnet 14 which extends upwardly and is arranged centrally in the frame 10 while being connected to a supporting plate 13.
  • This permanent magnet 14 cooperates with a coil 15 which forms the part of a transistor-controlled electronic circuit for inciting the vibration or maintaining the same.
  • the same supporting plate 13 is furthermore provided with two downwardly extending arms l6, 17 which comprise stepping or feeding magnets l8, 19 that extend toward each other and cooperate with a stepping wheel 20.
  • the vibrator l which consists of a high grade material as is used for instance for balance springs, is during its prefabrication, i.e. during the punching out of the vibrator 1 itself and when dimensioning the masses 10, ll; 13, 14, 16-19, given a starting frequency of for instance 105 cyclesper second, which means a frequency which is higher than the rated frequency of for instance 100 cycles per second.
  • the starting actual frequency of the vibrator l varies for instance by i two cycles per second.
  • the frequencies of the two legs may-differ from each other which means they are not in resonance. Both values, i.e'. the starting frequency as well as the frequency nonsymmetry can be ascertained in a control circuit corresponding to the time-keeping device.
  • the thin lines 12 illustrate the spring tension lines in the vibrator 1. As will be 'seen from FIG. 2, these lines crowd each other above all at the end of a slot 2 within the region of the fork foot 3, said slot2 separating the two legs 8, -9 from each other. Toward the edge, the density of said lines becomes less and less, which means a change in the dimensions of the legs 8, 9 starting from the slot 2, within the region of the fork foot 3, would influence the spring properties to a considerably greater extent than at the edge, for instance within the range of the notches 5.
  • spring material is removed at the edge and, more specifically; starting from the notches 5 in the direction toward the head of the legs. While by removal of material'there is obtained a reduction in the mass on one hand, it will be evident that on theother hand also the intensity of the spring is weakened. As long as the removal of material is effected within the region of the fork foot 3, this removal of material will make itself felt only by the reduction in the spring intensity. However, when the removal of material progresses toward the front in the direction toward the head, also a progressively effective reduction in the mass occurs. By the reduction of material at the edge, therefore, the equalization can be effected very precisely.
  • leg 8 or 9 Depending on whether the leg 8 or 9 has a higher starting frequency, more material will be removed at the edge of leg 8 or at the edge of leg 9. These two areas of removal of material are designated with the reference numerals 21 and 22.
  • the starting form of the vibrator l or its legs 8 9 is indicated by dotdash marginal lines.
  • the removal of material may be effected in any desired form, for instance by a dosed, preferably simultaneous, grinding into or grinding off or by sawing or milling the rim, preferably starting from the notches 5.
  • a particularly simple and fast material removal, which is simultaneously effected on both sides, is obtained by punching off or out operations.
  • the tool which is required for this purpose is illustrated diagrammatically in FIGS. 3. and 4. This tool consists of two punches 23, 24 which are arranged at a fixed or variable distance with regard to each other and are vertically displaceable in a guiding plate 25 and a cutting plate 26 while onthe inner side being provided with cutting surfaces or cutting edges 27, 28.
  • the vibrator l is by means of a carriage indicated by arrows a and b insertable in longitudinal direction and adjustable laterally toa limited extent.
  • a preadjustment in the direction of the arrow a serves for establishing frequency symmetry which means that it serves for the determination of the resonance of the two legs 8, 9 with subsequent punching operation.
  • the more or less frequently and widely effected stepwise displacement of the vibrator l in the direction of the arrow b with each respective punching operation serves the uniform frequency equalization of the vibrator 1 up to the rated frequency.
  • the vibratorl is preferably located in a receiving depression of the carriage (not iliustrated).
  • a method of adjusting and balancing the frequency and frequency symmetry, respectively, of a transverse flat fork vibrator which comprises a normally flatelement in substantially one plane having a connecting flap at one end, a foot portion integral with said flap and a pair of legs extending from said foot portion and terminating in free ends and which vibrate perpendicularlyto the plane of said vibrator, said legs being spaced by a slot extending from said foot portion to said free ends of said legs, said method comprising selectively removing material from the outer edges of said legs at their junction with said foot portion and opposite the end of said slot adjacent said foot portion, to reduce the frequency of vibration of said legs to a predetermined frequency and to equalize the vibration frequencies of the pair of legs.
  • a method according to claim 2 which includes the step of providing the transverse vibrator on opposite sides at the foot portion with a curved notched portion, and effecting the removal of material progressively from said notched portion of the foot portion in the direction toward the leg ends.
  • a method according to claim 2 which includes the steps of effecting the symmetry of the frequency of the vibrator legs by a lateral pre-adjustment of the vibrator relative to the material removing tools, and effecting the uniform reduction in frequency by a longitudinal displacement of the vibrator relataive to the material removing tools.
  • a method according to claim 4 which includes the steps of: ascertaining the starting frequency of the vibrator and the vibrator legs, subsequently in conformity with the deviation of the actual starting frequency moval of material is effected by progressively punching material from the edges of the vibrator legs in the direction toward the leg ends, the basic frequency deviation from the rated frequency being taken as an indication for the number and length of the necessary progressive punching steps.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
US00318570A 1971-12-24 1972-12-26 Method of adjusting the frequency of transverse vibrators having a plurality of legs Expired - Lifetime US3851385A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US00352860A US3810735A (en) 1972-12-26 1973-04-18 Heat fixing apparatus for fusible material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2164643A DE2164643B2 (de) 1971-12-24 1971-12-24 Verfahren und Werkzeug zum Abgleichen der Frequenz und/oder Frequenzsymmetrie mehrschenkliger Transversalschwinger

Publications (1)

Publication Number Publication Date
US3851385A true US3851385A (en) 1974-12-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00318570A Expired - Lifetime US3851385A (en) 1971-12-24 1972-12-26 Method of adjusting the frequency of transverse vibrators having a plurality of legs

Country Status (6)

Country Link
US (1) US3851385A (fr)
JP (1) JPS4874216A (fr)
CH (2) CH1825272A4 (fr)
DE (1) DE2164643B2 (fr)
FR (1) FR2164875B1 (fr)
GB (1) GB1405927A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992760A (en) * 1974-09-17 1976-11-23 General Electric Company Apparatus and process for measuring the resonant frequency and coefficient of coupling of a plurality of coupled piezoelectric resonators

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2806400A (en) * 1954-03-10 1957-09-17 Philamon Lab Inc Tuning forks
FR1277362A (fr) * 1960-10-18 1961-12-01 R Constant Soc D Expl Des Ets Diapason compensé
US3106124A (en) * 1961-07-21 1963-10-08 Melpar Inc Tuning forks
US3230614A (en) * 1963-06-13 1966-01-25 Musikinstrumentenbau Musima Ve Method and apparatus for automatically tuning mechanical frequency sources
US3759133A (en) * 1972-01-24 1973-09-18 Bunker Ramo Vibrator structure and method and apparatus for adjusting the frequency thereof
US3760482A (en) * 1972-05-18 1973-09-25 Suwa Seikosha Kk Method of adjusting frequency of tuning fork type vibrator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2806400A (en) * 1954-03-10 1957-09-17 Philamon Lab Inc Tuning forks
FR1277362A (fr) * 1960-10-18 1961-12-01 R Constant Soc D Expl Des Ets Diapason compensé
US3106124A (en) * 1961-07-21 1963-10-08 Melpar Inc Tuning forks
US3230614A (en) * 1963-06-13 1966-01-25 Musikinstrumentenbau Musima Ve Method and apparatus for automatically tuning mechanical frequency sources
US3759133A (en) * 1972-01-24 1973-09-18 Bunker Ramo Vibrator structure and method and apparatus for adjusting the frequency thereof
US3760482A (en) * 1972-05-18 1973-09-25 Suwa Seikosha Kk Method of adjusting frequency of tuning fork type vibrator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992760A (en) * 1974-09-17 1976-11-23 General Electric Company Apparatus and process for measuring the resonant frequency and coefficient of coupling of a plurality of coupled piezoelectric resonators

Also Published As

Publication number Publication date
GB1405927A (en) 1975-09-10
FR2164875A1 (fr) 1973-08-03
JPS4874216A (fr) 1973-10-06
DE2164643A1 (de) 1973-07-12
DE2164643B2 (de) 1975-11-06
FR2164875B1 (fr) 1975-09-12
CH1825272A4 (fr) 1975-03-14
CH566050A (fr) 1975-08-29

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