EP4372480A1 - Uhranordnung mit spiralfeder und stepper - Google Patents

Uhranordnung mit spiralfeder und stepper Download PDF

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Publication number
EP4372480A1
EP4372480A1 EP22208644.9A EP22208644A EP4372480A1 EP 4372480 A1 EP4372480 A1 EP 4372480A1 EP 22208644 A EP22208644 A EP 22208644A EP 4372480 A1 EP4372480 A1 EP 4372480A1
Authority
EP
European Patent Office
Prior art keywords
spiral spring
free end
eyebolt
groove
fixing assembly
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
EP22208644.9A
Other languages
English (en)
French (fr)
Inventor
Julien Christan
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.)
ETA SA Manufacture Horlogere Suisse
Original Assignee
ETA SA Manufacture Horlogere Suisse
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 ETA SA Manufacture Horlogere Suisse filed Critical ETA SA Manufacture Horlogere Suisse
Priority to EP22208644.9A priority Critical patent/EP4372480A1/de
Priority to US18/481,631 priority patent/US20240168438A1/en
Priority to JP2023179967A priority patent/JP2024074773A/ja
Priority to CN202322882404.5U priority patent/CN220962155U/zh
Priority to CN202311399017.4A priority patent/CN118057246A/zh
Priority to KR1020230147795A priority patent/KR20240074659A/ko
Publication of EP4372480A1 publication Critical patent/EP4372480A1/de
Pending legal-status Critical Current

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Classifications

    • 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
    • G04B17/32—Component parts or constructional details, e.g. collet, stud, virole or piton
    • G04B17/34—Component parts or constructional details, e.g. collet, stud, virole or piton for fastening the hairspring onto the 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
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/32—Component parts or constructional details, e.g. collet, stud, virole or piton
    • G04B17/325—Component parts or constructional details, e.g. collet, stud, virole or piton for fastening the hairspring in a fixed position, e.g. using a block
    • 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
    • G04B17/32—Component parts or constructional details, e.g. collet, stud, virole or piton
    • 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
    • G04B17/063—Balance construction
    • 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

Definitions

  • the present invention relates to a hairspring for a balance wheel of a watch movement.
  • the present invention also relates to a eyebolt for fixing a final turn to the outside of such a hairspring.
  • the invention also relates to a method of manufacturing such a hairspring.
  • a hairspring associated with a balance, forms a regulating organ commonly called a balance-spring for mechanical timepieces.
  • the hairspring appears in the form of a very fine spring which winds on itself in concentric turns when no constraint is exerted on it.
  • a first end of the hairspring called the first turn on the inside
  • a ferrule adjusted to an axis of the balance wheel
  • a second end of the hairspring called the last turn on the outside
  • the time base for mechanical timepieces also called an oscillating system, includes a balance-spring pair and an escapement.
  • the balance wheel consists of a balance shaft pivoted between a first and a second bearing and connected to a balance wheel rim by means of radial arms.
  • the hairspring is fixed via its first turn on the inside to the axis of the balance, for example by means of a ferrule, and it is fixed via its last turn on the outside to a fixed attachment point such as a piton carried by a piton carrier.
  • the exhaust in a very widespread embodiment, it includes a double plate system consisting of a large tray which carries a tray pin and a small tray in which a notch is made.
  • the escapement also includes an anchor, an anchor rod of which is pivoted between a first and a second bearing.
  • the anchor consists of a rod that connects a fork to an input arm and an output arm.
  • the fork consists of an entry horn and an exit horn and carries a stinger.
  • the fork travel is limited by an entry limit pin and an exit limit pin which can be made in one piece with an anchor bridge.
  • the input arm and the output arm respectively carry an input pallet and an output pallet.
  • the anchor cooperates with an escape wheel comprising an escape wheel and an escape pinion, this assembly formed by the wheel and the escape pinion being pivoted between a first and a second bearing.
  • a hairspring is a spring which, as its name suggests, takes the shape of a spiral when it is at rest. Winded in a horizontal plane, parallel to the plane of the watch movement, the hairspring serves only one function: to make the balance oscillate around its equilibrium position, also called dead center, at the most constant frequency possible. When the balance leaves its equilibrium position by pivoting in a given direction, the hairspring contracts. This creates a restoring torque in the balance spring which has the effect of returning the balance to its equilibrium position. During this beat, the hairspring relaxes. However, as the balance has acquired a certain speed, and therefore kinetic energy, it exceeds its equilibrium position in the opposite direction to the previous one until the return torque exerted by the balance spring on the balance stops the latter again. and forces it to turn in the other direction.
  • the hairspring therefore relaxes and contracts alternately: we say that it breathes.
  • many factors contribute to preventing a spiral from developing isochronously during the expansion and contraction phases.
  • the hairspring must in particular resist oxidation and magnetism which stick the turns together and tend to disrupt the precision of the watch, or even stop it completely.
  • the influence of atmospheric pressure on the other hand, is weak. For a long time, it was temperature that was the heart of the problem, because heat expands the metal, while cold shrinks it.
  • the hairspring must also be elastic to deform and yet always regain its shape.
  • the material used to make the hairsprings is usually steel. Ductile, the steel used must resist corrosion. For two decades now, developments have also proposed making hairsprings from silicon. Silicon hairsprings, particularly because they are insensitive to magnetism, make it possible to achieve greater running precision than their steel predecessors. On the other hand, their cost price is higher and, being fragile, they are more difficult to assemble.
  • a hairspring must be isochronous. No matter how far the pendulum turns, it must always take the same amount of time to swing. If the hairspring contracts only a few degrees, it accumulates little energy and slowly returns to its equilibrium position. If the hairspring is moved far from its equilibrium position, it moves very quickly in the opposite direction. The important thing is that these two trips take place within the same duration. The underlying idea is that the energy available to the hairspring is not constant and that it must still function whether the watch is fully wound or is in its last hours of power reserve.
  • hairsprings Due to their small dimensions, hairsprings are difficult to assemble. However, the way in which the two ends of a hairspring are fixed also greatly influences the precision of the running of the watch movement. In most mechanical watch movements, the two ends of the hairspring are inserted into a pierced part and are immobilized by means of a pin force-fitted manually using with pliers. A slight rotation of the hairspring can then occur, which is detrimental to the precision of the movement.
  • Another technique consists of fixing the ends of the spirals using glue.
  • this technique also showed its limits. It has in fact been observed that due to its viscosity, the glue exerts a traction force on the hairspring by capillary action and can press the ends of the hairspring against the walls of the piton in which these ends are engaged. The resulting deformation of the hairspring induces mechanical stresses in it which are detrimental to the regularity of its operation.
  • the Applicant has already proposed a method of fixing a spiral spring consisting of gluing the last turn to the outside of a spiral spring in a pin by means of a drop of polymerizable fluid glue for example by means of ultraviolet radiation.
  • a drop of polymerizable fluid glue for example by means of ultraviolet radiation.
  • the present invention aims to remedy the problems mentioned above as well as others by providing an assembly for fixing a spiral spring of which a last turn on the outside can be immobilized reliably without recourse to glue or pins or even manual operations such as pinching, crimping or others whose success depends largely on the skill of the operators.
  • the present invention relates to an assembly for fixing a free end of a last turn to the outside of a spiral spring for a clock movement, this fixing assembly comprising a pin and a fixing element. blocking, the eyebolt being provided with a groove in which the spiral spring is engaged at one point along its length, the blocking element also being engaged in the groove, in contact with the spiral spring, the fixing assembly also comprising a clamping member which presses the blocking element against the free end of the last turn outside the spiral spring, so that the free end of the last turn outside the spiral spring is immobilized in the groove of the eyebolt.
  • the spiral spring is engaged in the groove of the eyebolt by the free end of its last turn on the outside.
  • the immobilization of the free end of the last turn outside the spiral spring is ensured by mechanical tightening and blocking in a direction perpendicular to the plane in which extends this free end of the spiral spring.
  • the groove extends from an exterior wall of the piton and towards the interior of the latter.
  • the groove has a height and the blocking element a thickness such that, once the blocking element is engaged in this groove, there remains sufficient space to be able to engage the free end of the last turn outside the spiral spring in the groove.
  • the space in which the free end of the last turn is engaged outside the spiral spring extends between the blocking element and a bottom of the groove.
  • the free end of the last turn outside the spiral spring ends in a plate which is fixed on this free end or which is made in one piece with this free end.
  • a hole in which the clamping member is engaged is provided in the eyebolt so that the clamping member opens into the groove and presses against the blocking element and presses the latter against the free end of the last turn outside the spiral spring.
  • the clamping member is a threaded rod and in that the hole is tapped.
  • the blocking element is a clamp provided with two jaws connected to each other at a distal end, these two jaws delimiting between them an open space on the side of their end proximal.
  • the piton comprises a wall which delimits the groove.
  • the interior face of one of the jaws of the pliers has a surface which moves away from the wall of the eyebolt in the direction of engagement of the pliers on the peak.
  • the interior face of the jaws of the pliers is provided with a recess whose shapes are complementary and match those of the wall, allowing the pliers to grip the wall and to ensure sufficient support for the time for the operator to engage the last turn outside the spiral spring in the groove made in the eyebolt.
  • the spiral spring fixing assembly is removable.
  • the present invention provides an assembly for fixing the free end of the curve to the outside of a spiral spring for a clock movement with numerous advantages among which we can in particular cite the fact that the spiral springs can be attached without glue regardless of the type of material used to make such spiral springs. From this, it follows that the watch manufacturer enjoys complete freedom in the choice of the material in which the watch is made. spiral spring and that in addition, given that the free end of the spiral spring is not glued, the fixing assembly according to the invention is removable.
  • Yet another great advantage of the fixing assembly according to the invention lies in the fact that the mounting of the free end of the last turn outside the spiral spring does not depend in any way on the dexterity of the operator responsible for this assembly, so that the reproducibility of the operation of the balance-spring assemblies equipped with a fixing assembly according to the invention is quite remarkable.
  • the present invention proceeds from the general inventive idea which consists of fixing the free end of the last turn to the outside of a watch spiral spring in a pin by means of a fixing assembly ensuring the immobilization of this end free by a combined pressing action and mechanical blocking.
  • fixing the free end of the spiral spring does not require any gluing operation, so that one enjoys complete freedom in the choice of materials used to make the spiral spring.
  • the fixing assembly according to the invention remains constantly removable.
  • Another great advantage of the fixing assembly according to the invention the immobilization of the free end of the last turn outside the spiral spring is ensured by mechanical tightening and blocking in a direction perpendicular to the plane in which it is extends this free end of the spiral spring.
  • the fixing assembly according to the invention is represented as a whole on the figures 1 and 2 and includes in particular a peg 2.
  • the peg 2 illustrated in the drawing is delimited externally by an envelope of generally cylindrical shape.
  • the shape of the peg 2 is not decisive for the purposes of the invention, such a peg 2 being able to deviate from a cylindrical shape and be, for example, parallelepiped in shape.
  • a groove 6 is made from an exterior wall 4 of the eyebolt 2 and towards the interior of the latter, preferably of square or rectangular straight section, as is particularly visible on the figures 3 and 4 .
  • This groove 6 is intended to receive a free end 8 of a last turn outside 10 of a spring hairspring 12 for a watch movement for blocking the latter as described in detail below.
  • the fixing assembly 1 also comprises a blocking element 14 also intended to be engaged in the groove 6, in contact with the free end 8 of the last turn outside 10 of the spiral spring 12, then to be pressed against this free end 8 to ensure the immobilization of the spiral spring 12 in this groove 6.
  • the fixing assembly 1 is further completed by a clamping member 16 which is arranged to press the blocking element 14 in an adjustable manner against the free end 8 of the last turn outside 10 of the spiral spring 12.
  • the clamping member 16 can be of the type of a threaded rod 18 provided with a slotted head 20.
  • This threaded rod 18 is intended to be screwed into a threaded hole 22 made in the eyebolt 2 so that this rod threaded 18 opens into the groove 6 and presses against the blocking element 14 and presses the latter against the free end 8 of the last turn outside 10 of the spiral spring 12.
  • a friction surface 24, for example a knurling 26, can be provided on the eyebolt 2. This friction surface 24 can in particular be used by the operator for better gripping of this eyebolt 2 when screwing the threaded rod 18 in the tapped hole 22 of the eyebolt 2.
  • the clamping member 16 is a threaded rod 18.
  • the clamping member 16 which can take other forms such as, for example, a simple pin engaged with friction sufficiently thick in the hole made in the eyebolt 2 to be able to press against the blocking element 14 and firmly press the latter against the free end 8 of the last turn to the outside 10 of the spiral spring 12, while being able to be released from this hole if necessary, for example if the spiral spring 12 breaks.
  • the blocking element 14 is of the type of a clamp 28 provided with a certain elasticity and provided with two generally rectilinear jaws 30a and 30b which extend substantially parallel to, and at a distance from each other. Connected to each other at their distal end 32a, 32b, these two jaws 30a, 30b define between them a space 34 open on the side of their proximal end 36a, 36b.
  • the clamp 28 is engaged on either side of a wall 38 of the piton 2 which results from the machining of the groove 6.
  • the simple overlap of the clamp 28 on the wall 38 of the eyebolt 2 is sufficient to ensure sufficient retention of this clamp 28 for the time necessary for the operator to tighten the threaded rod 18.
  • This retention can, however, be slightly increased by providing the inner face of one of the jaws 30a, 30b of the clamp 28 of a surface 40 which moves away from the wall 38 of the stud 2 in the direction of engagement of the clamp 28.
  • Maintaining the clamp 28 on the wall 38 of the eyebolt 2 can be further improved by providing on the internal face of its jaws 30a, 30b recesses 42a, 42b whose shapes are complementary and match those of this wall 38, in this way allowing the clamp 28 to enclose the wall 38 of the piton 2 and to ensure its maintenance by friction.
  • the height of the groove 6 is greater than the thickness of the jaws 30a, 30b of the clamp 28, so that, once the clamp 28 is engaged in this groove 6, there remains a space sufficient to be able to easily engage the free end 8 of the last turn outside 10 of the spiral spring 12 in the groove 6.
  • the operation of fixing the free end 8 of the last turn to the exterior 10 of the spiral spring 12 is carried out as follows: we begin first by engaging the clamp 28 through its space 34 open on the side of the proximal end 36a, 36b of its jaws 30a, 30b in the groove 6 of the eyebolt 2, on either side of the wall 38 of this eyebolt 2.
  • the overlap of the clamp 28 on the wall 38 of the eyebolt 2 is sufficient to ensure that the clamp 28 is maintained on this wall 38 for the time necessary to fix the free end 8 of the last turn to the exterior 10 of the spiral spring 12 on the pin 2.
  • this clamp 28 When mounting the clamp 28, we ensure that this clamp 28 is positioned so that there remains sufficient space 44 between the jaws 30a, 30b of this clamp 28 and a bottom 46 of the groove 6 to be able to easily engage the free end 8 of the last turn to the outside 10 of the spiral spring 12. Once the clamp 28 is properly positioned and fixed in the groove 6 of the eyebolt 2, the free end 8 of the last turn is easily engaged on the outside 10 of the spiral spring 12 in the groove 6, between the bottom 46 of the latter and the jaws 30a, 30b of the clamp 28. Frequently, the free end 8 of the last turn outside 10 of the spiral spring 12 ends with a plate 50.
  • this plate 50 is fixed on the free end 8 of the last turn outside 10 of the spiral spring 12 for example by welding or is made in one piece with this free end 8.
  • the eyebolt 2 is engaged in an opening 60 provided in a eyebolt supporting part 62 which is carried by a bridge 64 commonly called cock and which is pivotally mounted around the axis 52 of the balance 48.
  • the groove 6 may have a cross section other than square or rectangular.
  • the friction surface 24 such as the knurling 26 provided on the eyebolt 2 is especially very useful after driving the eyebolt 2 into the eyebolt supporting part 62.
  • the threaded rod 18 can be screwed quite easily until to the locking position. Only the friction induced by the threads of the threaded rod 18 in the tapping of the eyebolt 2 is likely to cause the eyebolt 2 to rotate during this operation.
  • this spiral spring 12 can be engaged in the groove 6 of the pin 2 in one place of its length other than the free end 8 of its last turn outside 10. It will also be understood that the immobilization of the free end 8 of the last turn outside 10 of the spiral spring 12 is ensured by tightening and mechanical blocking in a direction perpendicular to the plane in which this free end 8 of the spiral spring 12 extends. In the case where the spiral spring 12 ends in a plate 50, if this plate 50 extends parallel to the plane in which is the spiral spring 12, the tightening-locking of this plate 50 will take place perpendicular to the plane of the spiral spring 12.
  • the plate 50 extends perpendicular to the plane in which the spiral spring 12 is located, the tightening-locking of this plate 50 will be in a direction parallel to the plane of the spiral spring 12.
  • the threaded rod 18 will be screwed into the eyebolt 2 in a direction perpendicular to the longitudinal axis of symmetry of the eyebolt 2.
  • the spiral spring 12 is in the form of an extremely thin ribbon wound on itself in a succession of turns, the plane in which the free end 8 of the last turn extends outside 10 of the spiral spring 12 the plane in which this winding is included.
  • the plate 50 is a surface element, for example of rectangular shape, and that, depending on the case, this surface element is either included in the plane of the spiral spring 12, or perpendicular to this plane.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Springs (AREA)
EP22208644.9A 2022-11-21 2022-11-21 Uhranordnung mit spiralfeder und stepper Pending EP4372480A1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP22208644.9A EP4372480A1 (de) 2022-11-21 2022-11-21 Uhranordnung mit spiralfeder und stepper
US18/481,631 US20240168438A1 (en) 2022-11-21 2023-10-05 Horological assembly comprising a balance spring and a stud
JP2023179967A JP2024074773A (ja) 2022-11-21 2023-10-19 ヒゲゼンマイおよびスタッドを備える時計アセンブリ
CN202322882404.5U CN220962155U (zh) 2022-11-21 2023-10-26 附接组件
CN202311399017.4A CN118057246A (zh) 2022-11-21 2023-10-26 包括游丝和外桩的钟表组件
KR1020230147795A KR20240074659A (ko) 2022-11-21 2023-10-31 밸런스 스프링 및 스터드를 포함하는 시측 조립체

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22208644.9A EP4372480A1 (de) 2022-11-21 2022-11-21 Uhranordnung mit spiralfeder und stepper

Publications (1)

Publication Number Publication Date
EP4372480A1 true EP4372480A1 (de) 2024-05-22

Family

ID=84360716

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22208644.9A Pending EP4372480A1 (de) 2022-11-21 2022-11-21 Uhranordnung mit spiralfeder und stepper

Country Status (5)

Country Link
US (1) US20240168438A1 (de)
EP (1) EP4372480A1 (de)
JP (1) JP2024074773A (de)
KR (1) KR20240074659A (de)
CN (2) CN220962155U (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH42750A (fr) * 1908-02-10 1909-03-16 Felix Perrelet James Piton avec dispositif de serrage du spiral
CH50092A (de) * 1910-01-06 1911-04-17 Adolf Haussener Vorrichtung zum Befestigen von Spiralfedern an Unruhkloben von Taschenuhren
CH701688A2 (fr) * 2009-08-25 2011-02-28 Glashuetter Uhrenbetrieb Gmbh Ensemble de fixation de l'extremite exterieure du spiral d'un dispositif a balancier-spiral pour piece d'horlogerie.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH42750A (fr) * 1908-02-10 1909-03-16 Felix Perrelet James Piton avec dispositif de serrage du spiral
CH50092A (de) * 1910-01-06 1911-04-17 Adolf Haussener Vorrichtung zum Befestigen von Spiralfedern an Unruhkloben von Taschenuhren
CH701688A2 (fr) * 2009-08-25 2011-02-28 Glashuetter Uhrenbetrieb Gmbh Ensemble de fixation de l'extremite exterieure du spiral d'un dispositif a balancier-spiral pour piece d'horlogerie.

Also Published As

Publication number Publication date
JP2024074773A (ja) 2024-05-31
US20240168438A1 (en) 2024-05-23
CN118057246A (zh) 2024-05-21
CN220962155U (zh) 2024-05-14
KR20240074659A (ko) 2024-05-28

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