EP4398046A1 - Procédé de mesure optique pour spires d'archomètre plat et spiral à géométrie optimisée pour ce procédé - Google Patents

Procédé de mesure optique pour spires d'archomètre plat et spiral à géométrie optimisée pour ce procédé Download PDF

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Publication number
EP4398046A1
EP4398046A1 EP23150151.1A EP23150151A EP4398046A1 EP 4398046 A1 EP4398046 A1 EP 4398046A1 EP 23150151 A EP23150151 A EP 23150151A EP 4398046 A1 EP4398046 A1 EP 4398046A1
Authority
EP
European Patent Office
Prior art keywords
spiral spring
distance
along
windings
measuring
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.)
Pending
Application number
EP23150151.1A
Other languages
German (de)
English (en)
Inventor
Uwe Heinz
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.)
Damasko Praezisionstechnik & Co Kg GmbH
Original Assignee
Damasko Praezisionstechnik & Co Kg GmbH
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 Damasko Praezisionstechnik & Co Kg GmbH filed Critical Damasko Praezisionstechnik & Co Kg GmbH
Priority to EP23150151.1A priority Critical patent/EP4398046A1/fr
Priority to DE102023133827.7A priority patent/DE102023133827B4/de
Priority to EP23213905.5A priority patent/EP4398047A1/fr
Priority to US18/533,783 priority patent/US20250164937A1/en
Priority to DE102023135139.7A priority patent/DE102023135139A1/de
Publication of EP4398046A1 publication Critical patent/EP4398046A1/fr
Pending 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
    • G04D7/00—Measuring, counting, calibrating, testing or regulating apparatus
    • G04D7/004—Optical measuring and testing apparatus
    • 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
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/06—Oscillators with hairsprings, e.g. balance
    • G04B17/066—Manufacture of the spiral spring
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D7/00—Measuring, counting, calibrating, testing or regulating apparatus
    • G04D7/10—Measuring, counting, calibrating, testing or regulating apparatus for hairsprings of balances
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D7/00—Measuring, counting, calibrating, testing or regulating apparatus
    • G04D7/12—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard
    • G04D7/1207—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard only for measuring
    • G04D7/1214—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard only for measuring for complete clockworks
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D7/00—Measuring, counting, calibrating, testing or regulating apparatus
    • G04D7/12—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard
    • G04D7/1207—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard only for measuring
    • G04D7/1214—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard only for measuring for complete clockworks
    • G04D7/1221—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard only for measuring for complete clockworks with recording, e.g. vibrograph
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D7/00—Measuring, counting, calibrating, testing or regulating apparatus
    • G04D7/12—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard
    • G04D7/1207—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard only for measuring
    • G04D7/1235—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard only for measuring for the control mechanism only (found from outside the clockwork)
    • G04D7/1242—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard only for measuring for the control mechanism only (found from outside the clockwork) for measuring amplitude
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D7/00—Measuring, counting, calibrating, testing or regulating apparatus
    • G04D7/12—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard
    • G04D7/1207—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard only for measuring
    • G04D7/1235—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard only for measuring for the control mechanism only (found from outside the clockwork)
    • G04D7/125—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard only for measuring for the control mechanism only (found from outside the clockwork) for measuring frequency

Definitions

  • the invention relates to an optical measuring method for determining the oscillation range of a spiral spring with several turns as well as a spiral spring for a mechanical clockwork and with geometry optimized for the measuring method.
  • Spiral springs in mechanical clockworks are Archimedean flat springs.
  • the windings of the so-called spiral blade run along respective circular paths in a common plane from an inner winding end to an outer winding end in a spiral shape.
  • the number of windings is typically between ten and fourteen, but spiral springs for mechanical clockworks with more or fewer windings are also known.
  • the distance between adjacent windings in spiral springs for mechanical clockworks is constant along the spiral path and is usually in a range between 0.08 mm and 0.2 mm.
  • the spiral spring together with the mass of an oscillating body, forms the oscillating and timing system, also known as the balance wheel.
  • the precise running of the clock is based on the spiral spring swinging back and forth as evenly as possible around its stress-free central position.
  • the spiral spring contracts and expands again; this is referred to as the "breathing" of the spiral spring.
  • the so-called oscillation range or amplitude corresponds to a full oscillation, i.e. a double deflection of the spiral spring from the central position in a first and a second, opposite direction and is therefore given in degrees.
  • the oscillation range is usually around 200° - 300°.
  • the oscillation period or frequency depends largely on the moment of inertia of the balance and is usually in the range of 1 to 5 oscillations per second.
  • the oscillation width and frequency are crucial for the accuracy of the movement and therefore must not have any or only very little Deviations from the intended target values are subject to change. Spiral springs with the most constant and unchanged oscillation behavior possible therefore make a significant contribution to the quality of a mechanical movement.
  • a spiral spring for mechanical clockworks is also known.
  • the active oscillation area of this spiral spring extends between the inner winding end, which is adjacent to a spiral spring fastening section, and the outer winding end, which has a spring holding point and is held by a holding element.
  • the spiral spring should be geometrically designed in such a way that the mass is reduced and the moment of inertia of the balance is thus positively influenced.
  • the active oscillation area should have several sub-areas, whereby the height and/or width of the spiral blade (which is rectangular here) of one sub-area differs from the height and/or width of another sub-area.
  • an optical measuring method during the oscillating movement of the spiral spring, in at least one winding section, a deflection of adjacent windings relative to one another and along their respective circular paths is optically recorded based on a variance in the distance between the adjacent windings along the winding section.
  • the distance between adjacent windings along a winding section or along the spiral course should not be constant, but should vary.
  • the evaluation of the optical measurement signals and the computational determination of the oscillation amplitude are preferably automated and integrated into the assembly line of a line assembly in watch movement production.
  • the signals recorded by the optical measuring devices are transmitted to a control module for this purpose.
  • the angular displacement is determined from the optical measurement signals obtained and the oscillation amplitude is calculated.
  • other values such as the number of turns of the spiral spring, their deviation from the Archimedean curve and/or logarithmic curve, the radial position of the monitored winding section, moment of inertia, breathing of the spiral spring, etc. can be taken into account in the programming and stored on the data carrier for this purpose.
  • the variance must not be too high to rule out the possibility of neighboring turns touching each other during the oscillation movement.
  • the distance should preferably vary by at least +/- 0.05 ⁇ m in order to optimize the optical detection, i.e. the maximum and minimum distance between the turns deviate from each other by at least 0.1 ⁇ m along the measuring section.
  • Such a variance can be optically recorded with modern measuring methods and can be used as a reference or reference for monitoring the relative movement and consequently the deflection of two neighboring turns with respect to each other.
  • the length of the measuring section preferably corresponds at least to the angular displacement. With an angular displacement in a range between 5° and 30°, a measuring distance of at least 0.1 mm to 0.9 mm results.
  • the windings move relative to one another in the oscillation movement, it is advantageous according to a variant of the invention to optically detect the deflection of neighboring windings relative to one another based on the distance between the neighboring windings, which varies steadily or continuously at least along a measuring section corresponding to the angular displacement.
  • a continuously changing optical measurement signal or image is obtained during the optical detection. This considerably simplifies the evaluation of the optical measurement signal to determine the maximum deflection, i.e. the point at which the oscillation movement reverses. At the same time, the susceptibility to errors is reduced.
  • the measuring height can, for example, correspond to a fraction, in particular half of the height of the adjacent turns, but also to the upper or lower longitudinal edge and depends on the specific geometry of the side surfaces of the adjacent turns facing each other, which causes the variance in the distance.
  • the accuracy or a deviation or error in the rate of a mechanical clockwork can be determined based on the determined oscillation width and/or frequency.
  • a target value/actual value comparison is carried out, whereby the determined oscillation width and/or frequency corresponds to the actual value and this is compared with a corresponding, previously determined target value.
  • the target value data can be stored in advance on an electronic data carrier of a control module suitable for carrying out the measuring method in order to carry out the optical measuring method automatically.
  • Such a spiral spring according to the invention has several windings which extend along respective circular paths forming a spiral, in particular Archimedean and/or logarithmic course and can be excited to an oscillating movement, in particular for timing a mechanical clockwork, with adjacent windings being deflected along their respective circular paths by an angular displacement relative to one another.
  • the spiral spring according to the invention is characterized in that the distance between the adjacent windings varies at least along a measuring section corresponding to the angular displacement ⁇ .
  • the variance of the distance between the adjacent turns along the measuring section is at least 0.05%, in particular at least 0.1%, at least 0.15% or at least 0.2% and more preferably at least 0.25%.
  • the variance should preferably be at most 1.5%, particularly preferably at most 1.0%.
  • the distance between the turns of a spiral spring for mechanical watch movements is constant along the entire spiral course and lies in a range of 0.06 mm to 0.25 mm.
  • Most spiral springs have a constant distance in a range of 0.08 mm to 0.2 mm.
  • this distance i.e. 0.08 mm or 0.2 mm
  • the distance differs at least along the measuring section by at least 6.0 ⁇ m, i.e. varies by +/- 3.0 ⁇ m.
  • the distance along the measuring section can (also) vary continuously or steadily.
  • the geometry of the side surfaces facing each other can be designed to follow a concave and/or convex course over the height and/or to enclose an opening angle in between and/or to have a rounded or bevelled transition area in the area of the upper and/or lower longitudinal edge, wherein the concave and/or convex profile and/or the opening angle and/or the rounding or bevelling of the transition area along the measuring section may vary.
  • the distance between the adjacent windings is the same over the entire height of the side surfaces facing each other and varies along the measuring section.
  • a continuous or continuously varying or irregular course of the upper and lower longitudinal edges along the measuring section can continue into the corresponding side surfaces, so that a Spiral blade creates a constant distance between the adjacent turns that varies along the measuring section.
  • the force coming from the spring barrel is transferred to the oscillation system 200 so that the spiral spring 100 oscillates as evenly as possible about its stress-free central position.
  • the oscillating body 210 causes the spiral spring 100 to be pre-tensioned, which generates a return torque that causes the spiral spring 100 to return to its central position.
  • the oscillating body 210 is given kinetic energy, causing the spiral spring 100 to oscillate in the other direction beyond its central position.
  • the spiral spring 100 oscillates back and forth once according to its oscillation range. Oscillation ranges of flat spiral springs for mechanical clockworks are usually between 200° and 300°.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Springs (AREA)
EP23150151.1A 2023-01-03 2023-01-03 Procédé de mesure optique pour spires d'archomètre plat et spiral à géométrie optimisée pour ce procédé Pending EP4398046A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP23150151.1A EP4398046A1 (fr) 2023-01-03 2023-01-03 Procédé de mesure optique pour spires d'archomètre plat et spiral à géométrie optimisée pour ce procédé
DE102023133827.7A DE102023133827B4 (de) 2023-01-03 2023-12-04 Optisches Messverfahren für archimedische Flachspiralen und Spiralfeder mit dafür optimierter Geometrie
EP23213905.5A EP4398047A1 (fr) 2023-01-03 2023-12-04 Procédé de mesure optique pour spires d'archomètre plat et spiral à géométrie optimisée pour ce procédé
US18/533,783 US20250164937A1 (en) 2023-01-03 2023-12-08 Optical Measuring Method For Archimedian Flat Spirals And Spiral Springs With Optimized Geometry
DE102023135139.7A DE102023135139A1 (de) 2023-01-03 2023-12-14 Optisches Messverfahren für archimedische Flachspiralen und Spiralfeder mit dafür optimierter Geometrie

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23150151.1A EP4398046A1 (fr) 2023-01-03 2023-01-03 Procédé de mesure optique pour spires d'archomètre plat et spiral à géométrie optimisée pour ce procédé

Publications (1)

Publication Number Publication Date
EP4398046A1 true EP4398046A1 (fr) 2024-07-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP23150151.1A Pending EP4398046A1 (fr) 2023-01-03 2023-01-03 Procédé de mesure optique pour spires d'archomètre plat et spiral à géométrie optimisée pour ce procédé

Country Status (1)

Country Link
EP (1) EP4398046A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014203085A1 (fr) 2013-06-21 2014-12-24 Damasko Uhrenmanufaktur KG Système oscillant pour mouvements d'horlogerie mécaniques, procédé de production d'un spiral et spiral
EP3159747A1 (fr) * 2015-10-22 2017-04-26 ETA SA Manufacture Horlogère Suisse Spiral a encombrement reduit a section constante
EP3452874B1 (fr) 2016-05-02 2020-06-10 Patek Philippe SA Genève Spiral d'horlogerie
EP4030243A1 (fr) * 2021-01-18 2022-07-20 Richemont International S.A. Procédé de controle et de fabrication de ressorts spiraux d' horlogerie

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014203085A1 (fr) 2013-06-21 2014-12-24 Damasko Uhrenmanufaktur KG Système oscillant pour mouvements d'horlogerie mécaniques, procédé de production d'un spiral et spiral
EP3159747A1 (fr) * 2015-10-22 2017-04-26 ETA SA Manufacture Horlogère Suisse Spiral a encombrement reduit a section constante
EP3452874B1 (fr) 2016-05-02 2020-06-10 Patek Philippe SA Genève Spiral d'horlogerie
EP4030243A1 (fr) * 2021-01-18 2022-07-20 Richemont International S.A. Procédé de controle et de fabrication de ressorts spiraux d' horlogerie

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