EP3570118B1 - Piton pour la fixation d'un ressort spiral d'un mouvement d'horlogerie et procédé de fabrication d'un tel piton - Google Patents

Piton pour la fixation d'un ressort spiral d'un mouvement d'horlogerie et procédé de fabrication d'un tel piton Download PDF

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Publication number
EP3570118B1
EP3570118B1 EP18172195.2A EP18172195A EP3570118B1 EP 3570118 B1 EP3570118 B1 EP 3570118B1 EP 18172195 A EP18172195 A EP 18172195A EP 3570118 B1 EP3570118 B1 EP 3570118B1
Authority
EP
European Patent Office
Prior art keywords
free end
spiral spring
outside
gap
glue
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.)
Active
Application number
EP18172195.2A
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German (de)
English (en)
French (fr)
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EP3570118A1 (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
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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.)
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Publication date
Application filed by ETA SA Manufacture Horlogere Suisse filed Critical ETA SA Manufacture Horlogere Suisse
Priority to EP18172195.2A priority Critical patent/EP3570118B1/fr
Priority to JP2019065797A priority patent/JP6892888B2/ja
Priority to US16/379,009 priority patent/US11480926B2/en
Priority to CN201910393205.3A priority patent/CN110488592B/zh
Publication of EP3570118A1 publication Critical patent/EP3570118A1/fr
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Publication of EP3570118B1 publication Critical patent/EP3570118B1/fr
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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
    • G04B17/325—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

Definitions

  • the present invention relates to a stud for fixing a spiral spring of a clock movement. More specifically, the present invention relates to a stud in which a last turn on the outside of a spiral spring of a clock movement is fixed by gluing. The invention also relates to a method of manufacturing such a stud.
  • a spiral spring associated with a balance wheel forms a time base for mechanical timepieces.
  • the spiral spring comes in the form of a very thin spring wound in concentric turns.
  • a first end of the spiral spring, called the first coil on the inside, is fixed to a ferrule, and a second end of the spiral spring, called the last coil on the outside, is fixed to a stud.
  • the time base for mechanical timepieces also called an oscillating system, comprises a balance wheel-hairspring couple and an escapement.
  • the balance comprises a balance shaft pivoted between a first and a second bearing and connected to a balance rim by means of radial arms.
  • the spiral spring is fixed via its first turn on the inside to the axis of the balance, for example by means of a ferrule.
  • the spiral spring is fixed via its last turn on the outside to an attachment point formed by a stud carried by a stud holder if necessary.
  • the escapement for its part, comprises a double plate system consisting of a large plate which carries a plate peg and a small plate in which a notch is made.
  • the escapement also comprises an anchor whose anchor axis 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 between which extends a stinger.
  • the travel of the fork is limited by an entry limiting pin and an exit limiting 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 lever cooperates with an escape wheel comprising an escape wheel axis pivoted between a first and a second bearing.
  • the spiral spring takes the form of a spiral wound in a horizontal plane, parallel to the plane of the clock movement, it serves only one function: once associated with a balance wheel, it must turn in one direction, then in the opposite direction. other, that is to say oscillate around its equilibrium position at a frequency that is as constant as possible.
  • the spiral spring is said to breathe. However, everything contributes to prevent a spiral spring from oscillating always at the same frequency.
  • the spiral spring must in particular resist oxidation and magnetism which stick the turns together and stop the watch.
  • the influence of atmospheric pressure on the other hand, is weak. For a long time, it was the temperature that was the heart of the problem, because the heat expands the metal, while the cold shrinks it.
  • the spiral spring must also be elastic in order to deform and yet always regain its shape.
  • spiral springs The material used for the production of spiral springs is usually steel. Ductile, such an alloy must resist corrosion. Recent developments suggest making the spiral springs out of silicon. Silicon hairsprings, in particular because they are insensitive to magnetism, are more precise than their steel predecessors. On the other hand, their cost price is higher and they are more difficult to assemble.
  • a spiral spring must be isochronous. No matter how far the spiral spring rotates, it should always take the same amount of time to oscillate. If the spiral spring contracts only a few degrees, it accumulates little energy and slowly returns to its equilibrium position. If the spiral spring is moved far away from its equilibrium position, it goes very quickly in the opposite direction. The important thing is that these two trips take place in the same duration. The underlying idea is that the energy available to the balance spring is not constant and that it must nevertheless operate whether the watch is fully wound or in its last hours of power reserve.
  • the Applicant has already proposed a method for attaching a spiral spring which does not induce mechanical stress in such a spiral spring and does not move it away from its rest position.
  • This method consists in gluing the last turn to the outside of a spiral spring in a stud by means of a drop of polymerizable fluid adhesive, for example by means of ultraviolet radiation.
  • a drop of polymerizable fluid adhesive for example by means of ultraviolet radiation.
  • the document CH 622 149 A describes a stud which has a diametrical slot intended to receive the glue which is used to fix the hairspring to the stud.
  • the hairspring is engaged in a radial hole formed in the peak and which opens into the diametral slot.
  • the glue consisting of a polymerizable resin, is then placed in the slot from where it spreads into the hole.
  • the document FR 2 051 170 A5 discloses the use of a sheet enclosing a spring at the entrance to a hole in order to prevent glue from escaping from a stud.
  • the object of the present invention is to solve the problems mentioned above as well as others still by providing a new type of stud whose geometry makes it possible to guarantee that the glue pad in which the free end of the last turn is imprisoned on the outside of the spiral spring will not separate from the eyebolt even if this glue pad no longer adheres to the eyebolt.
  • the present invention relates to a stud used to fix a free end of a last turn to the outside of a spiral spring for a clockwork movement, this stud comprising a base which extends in a plane and on which stand a first arm and a second arm which are free at their end opposite the base, the first and the second arm being separated from each other by a gap in which is housed the free end of the last turn on the outside of the spiral spring which is trapped in a pad of hardened glue, at least one of the first and second arms being provided with a stopping means arranged to prevent the pad of glue in which is trapped the free end of the last turn outside the spiral spring to disengage from the gap in which it is housed when this patch of glue no longer adheres to the eyebolt, characterized in that at least the first arm (6 ) comprises a groove (38) at a distance of its free end, this groove (38) extending in a plane which forms an angle with the plane (P) of the base (4) and which delimits for at least the first arm
  • At least one of the first and second arms is pierced right through with a hole.
  • the stopper means protrudes into the gap provided to receive the hardened glue pad in which the free end of the last turn outside the spiral spring is trapped.
  • the stopping means is at least one bead which is made of material with the corresponding arm of the piton.
  • the present invention provides a piton used to fix the free end of the last turn to the outside of a spiral spring for a clock movement, this piton being provided with a stopping means provided to prevent the glue pad in which the free end of the last turn outside the spiral spring is trapped from coming out of the gap in which this pad is housed when the latter no longer adheres to the eyebolt.
  • the present invention applies to all known types of spiral springs. These may in particular be metal hairsprings typically made of steel. It can also be spiral springs made of silicon.
  • the present invention is also not limited to a particular type of glue.
  • the free end of the last turn outside the spiral spring can for example be glued in the interstice of the peak by means of the adhesive well known under its name "shellac" (adhesive known under the same name or under the name “shellac” in Anglo-Saxon terminology), or else be glued using a liquid adhesive which can, for example, be polymerized using UV radiation.
  • shellac lies essentially in the fact that it adheres well and durably to the piton.
  • the bonding of the hairsprings to the studs using shellac has never been automated and its success remains entirely dependent on the dexterity of the operator responsible for this operation.
  • Shellac is a resin and the operator takes a small shaving which he places in the gap intended to receive the free end of the last outer turn of the spiral spring. After having placed this end of the spiral spring in the interstice of the eyebolt, the operator briefly heats the chip of shellac which melts and traps the free end of the last outer turn of the spiral spring. The operator then leaves the shellac to cool and, after visual inspection, decides whether to add an additional quantity of shellac or whether to move on to the next balance spring/eyebolt assembly. It is understood that such a succession of operations is difficult to automate.
  • the disadvantage of the photo-polymerizable glue is that its adhesion to the stud is not very satisfactory and that the risks that the glue pad in which the free end of the last turn turns outside the spiral spring is imprisoned detaches from the piton are raised. It is to respond to these problems that the present invention proposes to provide a watch stud with a stopper means of the type of a groove to prevent the glue pad in which is trapped the free end of the last coil on the outside of the spiral spring to detach from this eyebolt.
  • the peak is typically in the form of a base which extends in a plane from which two arms separated from each other by a gap provided to receive the free end of the last turn on the outside extend.
  • the stopper means can take various forms, among which mention may be made, in a non-limiting manner, of a hole which passes right through at least one of the two arms and which is not part of the invention.
  • the stopping means can also be provided in the form of an element, for example a bead, which does not form part of the invention and which protrudes into the gap of the stud in which the free end of the the last coil on the outside of the spiral spring. Also in this case, if the glue pad in which the free end of the spiral spring is trapped separates from the peak, this hardened glue pad will not be able to escape from the gap.
  • at least one of the first and second arms of the stud comprises a groove which extends in a plane which forms an angle with the plane of the base. This groove delimits a hook which acts as a means of stopping the glue pad.
  • the invention also relates to a method of manufacturing a stud used for fixing a free end of a last turn to the outside of a spiral spring for a clockwork movement, this stud comprising a base which is extends in a plane and a first and a second arm which extend from this plane, the first and the second arm being separated from each other by a gap in which the free end of the last turn on the outside of the spiral spring which is trapped in a pad of hardened glue, the gap being initially made with a first width, the method comprising the step of widening the gap by stamping and creating by upsetting of material a stopper means which protrudes into the gap provided to receive the hardened glue pad in which is trapped the free end of the last turn outside the spiral spring.
  • the present invention proceeds from the general inventive idea which consists in providing a stud intended for fixing a spiral spring of a clockwork movement with a stopper means of the type of a groove provided to prevent one end free of a last turn outside the spiral spring to decouple from the eyebolt and cause the clockwork movement to stop immediately.
  • the peak comprises a base which extends in a plane from which extend a first and a second arm separated from each other by a gap. This gap is provided to receive the free end of the last turn outside the spiral spring which will be immobilized by means of a pad of glue hardened by ultraviolet radiation.
  • At least one of the two arms of the eyebolt is provided with a groove provided to prevent the glue pad, and therefore the free end of the turn outside the spiral spring, from slipping. escape from the interstice in the event that the patch of glue should become detached from the eyebolt.
  • This stopping means is in the form of a groove which delimits a hook.
  • the peak 2 comprises a base 4 which extends in a plane P on which stand a first arm 6 and a second arm 8 which are free at their end opposite the base 4.
  • the first and second arms 6 and 8 extend perpendicular to the plane P of the base 4 and are separated from each other by a gap 10 substantially parallelepipedic.
  • the eyebolt 2 is provided with a stopper means provided to prevent a glue pad 16 in which is trapped a free end 18 of a last turn outside of a spiral spring 20 from escaping from the gap 10 in the case where the glue pad 16 separates from the peak 2.
  • this stopping means is in the form of a hole 22 pierced right through in at least one of the first and second arms 6, 8. In the example illustrated in Figures 1A, 1B , a hole 22 is drilled in each of the two arms 6 and 8.
  • spiral spring 20 in silicon more particularly visible on the figures 6A and 6B is conventionally made up of a very thin spring wound in concentric turns and whose section is constant over substantially its entire length.
  • This spiral spring 20 is fixed via a free end 24 of a first coil inside to a balance shaft of the watch movement (not shown) for example by means of a ferrule 28, and via the free end 18 of its last turn on the outside at the peak 2.
  • the last turn on the outside of the spiral spring 20 slightly thicker than the other turns over part of its length, can be provided at its free end 18 with a plate 30 made in one piece with the spiral spring 20.
  • the presence of the plate 30 is dictated by considerations specific to the technique of manufacturing the spiral springs 20 in silicon only. It is important to understand that the presence of this plate 30 is in no way made necessary by the needs of the present invention and that it is quite possible to fix a spiral spring without such a plate on the peak 2 according to the invention.
  • a hole 22 is drilled right through in each of the two arms 6 and 8.
  • the latter diffuses into the holes 22 by capillarity, holes 22 in which the liquid glue will remain trapped and harden after insolation by means of UV radiation or in contact with air.
  • the patch of glue 16 will not be able to come out of the gap 10, in particular in the region where the liquid glue will have hardened in the holes 22.
  • a groove 38 which extends in a plane which forms an angle with the plane P of the base 4 is machined in at least one of the first and second arms 6, 8.
  • a groove 38 is machined in the two arms 6 and 8 and extends in a plane perpendicular to the plane P of the base.
  • the groove 38 delimits for each of the first and second arms 6 and 8 a hook 40 which, once the glue pad 16 has hardened, for example by insolation by means of UV radiation or in contact with the air, will retain the resulting glue pad 16 and prevent it from coming out of the gap 10 in the event that the glue pad 16 separates from the peak 2.
  • the hooks 40 form two bearing surfaces 42 on which the liquid adhesive will be deposited by capillary action before hardening to form the glue pad 16 and which will prevent any possible shrinkage of this glue pad 16.
  • the 2D figure is a view analogous to those of figures 2A to 2C on which we see the spiral spring 20 in silicon fixed on the peak 2 by the free end 18 of its last turn on the outside by means of a glue pad 16.
  • the stopper means protrudes into the gap 10 provided to receive the pad of hardened glue 16 in which the free end 18 of the last turn outside the spring is imprisoned. hairspring 20.
  • the stopping means is in the form of a bead 46 made in one piece with each of the internal side surfaces 48 which face each other of the first and second arms 6 and 8.
  • FIG. 3B is a view analogous to that of Figure 3A on which we see the spiral spring 20 in silicon fixed by the free end 18 of its last turn to the outside on the eyebolt 2 by means of a glue pad 16.
  • a possible technique for making the beads 46 is illustrated in figures 4A and 4B .
  • This technique consists in providing a piton 2 having a gap 10 whose initial width is d1 , then introducing into this gap 10 a stamping tool 50 whose width d2 is greater than the width d1 and corresponds to the final width of the interstice 10 sought.
  • the stamping tool 50 By forcing the stamping tool 50 into the gap 10, the material is pushed back and a bead 46 is created on each of the internal side surfaces 48 of the first and second arms 6, 8.
  • the beads 46 correspond to a preferred but non-limiting embodiment. Indeed, to obtain a stopper means projecting into the gap 10, it can also be envisaged, for example, to pierce right through at least one of the two arms 6, 8, then to introduce into the orifice thus obtained a pin which protrudes into the gap 10.
  • FIG. 5A Another possible technique for creating an annular flange 52 is illustrated in figures 5A to 5D .
  • This technique consists of providing a piton 2 having a gap 10, then introducing into this gap 10 a drilling tool 54 whose end is conical. By advancing the drilling tool 54 in the gap 10 from the free end of the arms 6, 8 towards the base 4, a first hole 56 is created in the peak 2 ( figure 5A ). Conversely, a second hole 58 is machined in the peak 2 from the base 4 towards the free end of the first and second arms 6, 8 ( figure 5B ). The machining is carried out so that the second hole 58 partially opens into the first hole 56, locally retaining an annular flange 52 on the internal side surfaces 48 of the first and second arms 6 and 8 ( Fig. 5C ).
  • This drop of liquid adhesive 32 is for example deposited by means of a dispensing device 60 automated such as a syringe still known by its Anglo-Saxon name “dispenser”. Exposing the drop of liquid glue 32 to ultraviolet light allows it to polymerize and harden completely. It will be noted that the example of the liquid adhesive polymerizable by exposure to ultraviolet light is given by way of example only, and that other types of liquid adhesives such as an adhesive hardening in contact with air can be envisaged. .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Springs (AREA)
  • Adornments (AREA)
  • Standing Axle, Rod, Or Tube Structures Coupled By Welding, Adhesion, Or Deposition (AREA)
EP18172195.2A 2018-05-14 2018-05-14 Piton pour la fixation d'un ressort spiral d'un mouvement d'horlogerie et procédé de fabrication d'un tel piton Active EP3570118B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP18172195.2A EP3570118B1 (fr) 2018-05-14 2018-05-14 Piton pour la fixation d'un ressort spiral d'un mouvement d'horlogerie et procédé de fabrication d'un tel piton
JP2019065797A JP6892888B2 (ja) 2018-05-14 2019-03-29 計時器用ムーブメントの渦巻き状のばねを固定するバランスばねスタッド及びこのようなバランスばねスタッドを製造する方法
US16/379,009 US11480926B2 (en) 2018-05-14 2019-04-09 Balance-spring stud for fixing a spiral spring of a timepiece movement and method for manufacturing such a balance-spring stud
CN201910393205.3A CN110488592B (zh) 2018-05-14 2019-05-13 游丝外桩和用于制造游丝外桩的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18172195.2A EP3570118B1 (fr) 2018-05-14 2018-05-14 Piton pour la fixation d'un ressort spiral d'un mouvement d'horlogerie et procédé de fabrication d'un tel piton

Publications (2)

Publication Number Publication Date
EP3570118A1 EP3570118A1 (fr) 2019-11-20
EP3570118B1 true EP3570118B1 (fr) 2022-01-12

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EP18172195.2A Active EP3570118B1 (fr) 2018-05-14 2018-05-14 Piton pour la fixation d'un ressort spiral d'un mouvement d'horlogerie et procédé de fabrication d'un tel piton

Country Status (4)

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US (1) US11480926B2 (zh)
EP (1) EP3570118B1 (zh)
JP (1) JP6892888B2 (zh)
CN (1) CN110488592B (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6757481B1 (ja) * 2020-01-29 2020-09-16 セイコーウオッチ株式会社 調速機、脱進機、ムーブメント及び時計
EP4386490A1 (fr) * 2022-12-13 2024-06-19 The Swatch Group Research and Development Ltd Composant d'horlogerie résultant de l'assemblage de deux pièces et procédé de fabrication dudit composant

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2141622A1 (zh) * 1971-06-15 1973-01-26 Lip Horlogerie
FR2283475A1 (fr) * 1973-12-21 1976-03-26 Epsilon Sarl Procede pour la fixation de l'extremite exterieure d'un ressort spiral a un piton et piton pour la mise en oeuvre du procede

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH499804A (fr) * 1965-04-21 1969-04-15 Virola Sa Dispositif de fixation d'un spiral d'horlogerie à l'axe du balancier
DE1932432A1 (de) * 1969-06-26 1971-01-07 Kienzle Uhrenfabriken Gmbh Vorrichtung zum Befestigen eines Endes einer Schwingfeder
CH559382A (zh) * 1973-01-12 1975-02-28
JPS521172U (zh) * 1975-06-23 1977-01-06
CH600404B5 (zh) * 1975-12-02 1978-06-15 Hormec Sa
CH622149GA3 (en) * 1977-12-23 1981-03-31 Device for fixing the outer end of a hairspring to the framework of the movement of a timepiece and method for manufacturing this device
EP0942337B1 (en) * 1997-08-28 2006-11-15 Seiko Epson Corporation Timepiece or music box
EP1515200A1 (fr) * 2003-09-10 2005-03-16 Patek Philippe S.A. Spiral d'horlogerie
EP3118692B1 (fr) * 2015-07-16 2018-12-26 Nivarox-FAR S.A. Fixation de ressort-spiral d'horlogerie par collage
EP3211486B1 (fr) * 2016-02-25 2018-09-26 ETA SA Manufacture Horlogère Suisse Procede de fixation d'un spiral pour mouvement d'horlogerie mecanique
CH711473B1 (fr) * 2016-02-25 2017-03-15 Eta Sa Mft Horlogère Suisse Procédé de fixation d'un spiral pour mouvement d'horlogerie mécanique au moyen d'une colle dans un piton.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2141622A1 (zh) * 1971-06-15 1973-01-26 Lip Horlogerie
FR2283475A1 (fr) * 1973-12-21 1976-03-26 Epsilon Sarl Procede pour la fixation de l'extremite exterieure d'un ressort spiral a un piton et piton pour la mise en oeuvre du procede

Also Published As

Publication number Publication date
JP6892888B2 (ja) 2021-06-23
JP2019200199A (ja) 2019-11-21
CN110488592A (zh) 2019-11-22
US20190346812A1 (en) 2019-11-14
US11480926B2 (en) 2022-10-25
CN110488592B (zh) 2021-03-16
EP3570118A1 (fr) 2019-11-20

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