EP4160320A1 - Uhrwerkmechanismus - Google Patents

Uhrwerkmechanismus Download PDF

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Publication number
EP4160320A1
EP4160320A1 EP21200712.4A EP21200712A EP4160320A1 EP 4160320 A1 EP4160320 A1 EP 4160320A1 EP 21200712 A EP21200712 A EP 21200712A EP 4160320 A1 EP4160320 A1 EP 4160320A1
Authority
EP
European Patent Office
Prior art keywords
wheel
barrel
winding
star
crown
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
EP21200712.4A
Other languages
English (en)
French (fr)
Inventor
Didier VUILLEMIN
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.)
Patek Philippe SA Geneve
Original Assignee
Patek Philippe SA Geneve
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 Patek Philippe SA Geneve filed Critical Patek Philippe SA Geneve
Priority to EP21200712.4A priority Critical patent/EP4160320A1/de
Publication of EP4160320A1 publication Critical patent/EP4160320A1/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
    • G04B3/00—Normal winding of clockworks by hand or mechanically; Winding up several mainsprings or driving weights simultaneously
    • G04B3/08—Normal winding of clockworks by hand or mechanically; Winding up several mainsprings or driving weights simultaneously by parts of the cases
    • G04B3/10—Protecting means preventing overwinding
    • 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
    • G04B27/00—Mechanical devices for setting the time indicating means
    • G04B27/004—Mechanical devices for setting the time indicating means having several simultaneous functions, e.g. stopping or starting the clockwork or the hands
    • 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
    • G04B11/00—Click devices; Stop clicks; Clutches
    • G04B11/001—Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power
    • 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
    • G04B3/00—Normal winding of clockworks by hand or mechanically; Winding up several mainsprings or driving weights simultaneously
    • G04B3/06—Keys or the like with means preventing overwinding

Definitions

  • the present invention relates to a horological mechanism for a hand-wound watch comprising a winding mechanism and a barrel, designed to avoid any risk of excess tension on the barrel spring during its winding.
  • the invention also relates to a timepiece comprising such a mechanism.
  • the barrel of a watch is an assembly generally made up of a barrel drum, a barrel spring, a barrel arbor and a barrel cover.
  • the shaft serves as a pivot for the drum.
  • the mainspring is housed in the drum and fixed by its inner coil to the barrel arbor and by its outer coil to the barrel drum.
  • the lid closes the box; it pivots around the shaft. Winding is typically done by means of a ratchet made integral in rotation with the barrel arbor via a square.
  • the over-tensioning of the barrel spring corresponds to too great a state of winding. It has several drawbacks. It can, among other things, be the cause of rebate in the balance wheel and therefore affect chronometry. It can also lead to the breakage of the flange or of another element such as the winding stem or a wheel in the kinematic winding chain.
  • the winding of the spring continues when it has reached its maximum tension in the barrel.
  • a rigid attachment of the outer coil of the spring to the barrel drum would lead to an overtension of the barrel spring and would risk, among other things, damage the watch.
  • the mainspring is not hooked to the barrel but is fixed by its outer end to a blade which presses against the walls of the barrel drum and takes up a little more than one turn. This blade, called a sliding flange, allows the spring to wind normally. Then, when the mainspring reaches a certain level of winding, the last coil of the mainspring slides against the drum.
  • An overvoltage which may go so far as to cause the breakage of the barrel spring or of a component of the winding device may also occur in a manually wound watch, in particular if the user forces the winding stem.
  • the use of a sliding strap has the disadvantage of occupying one turn of the barrel and therefore of reducing the power reserve of the watch compared to a watch comprising a barrel of equivalent size but not comprising a sliding strap.
  • the use of a barrel with a sliding flange does not allow the user who manually winds his watch to feel whether the spring is fully wound. Thus, such a barrel is not suitable in a hand-wound watch.
  • the use of a slipping flange can lead to the accumulation of debris inside the barrel and then cause malfunctions.
  • An object of the present invention is to provide a watch mechanism comprising a barrel spring and a manually operable winding mechanism, said watch mechanism avoiding any overvoltage, in particular any risk of breakage of the barrel spring, during its winding, and alleviating at least in part the aforementioned drawbacks.
  • the mechanism according to the invention will also make it possible to give sensory information, typically tactile or acoustic, allowing the user of the watch to know that the latter has reached an optimal level of winding.
  • the present invention relates to a timepiece mechanism comprising a winding mechanism and a barrel.
  • the watch mechanism according to the invention is designed so that the kinematic chain going from the winding pinion to the arbor or to the barrel drum comprises a release wheel, said wheel being designed to disengage when the torque delivered by the barrel spring exceeds a predetermined threshold value.
  • This threshold value corresponds to a so-called optimal winding of the barrel spring, that is to say a winding enabling it to deliver the greatest possible torque without however being subjected to an overvoltage.
  • the release wheel assembly comprises a first wheel, a second wheel and a coaxial spider as well as a pawl or jumper fixed to one of said two wheels and positioning the latter relative to the star, the star being integral with the other of said two wheels.
  • Said first and second wheels are typically toothed wheels.
  • the release wheel assembly comprises a first wheel, typically toothed, and a coaxial spider as well as at least one pawl or jumper fixed to said first wheel and positioning the latter relative to the star.
  • the first wheel and the star are coaxial with the barrel arbor, the first wheel is mounted free to rotate around the arbor and the star is integral in rotation with the arbor.
  • the wheel which carries said at least one jumper and said pawl or jumper form a one-piece assembly.
  • said at least one pawl or jumper is integral with the wheel that carries it.
  • the invention also relates to a timepiece such as a wristwatch, a pocket watch, a clock or a clock comprising such a clockwork mechanism.
  • a watch mechanism 1 according to a first embodiment of the invention comprises a barrel and a winding mechanism for this barrel.
  • the barrel of the mechanism 1 traditionally comprises a barrel drum 2 comprising a toothing 21, a barrel arbor 3 rotatable about an axis A in the drum 2 and a barrel spring (not visible in the figures) housed in this drum 2.
  • the inner turn of this spring is typically fixed on a hook carried by a bung of the shaft 3 and its outer turn is fixed on the inner surface of the drum to ensure the drive of the drum 2.
  • the winding mechanism of mechanism 1 comprises a winding stem 4, a winding pinion 5, a crown mobile 6, a ratchet 7 mounted on the shaft 3 and secured in rotation to the latter by a square.
  • the winding pinion 5 is mounted, in the traditional way, free to rotate on the winding stem 4. It is made integral in rotation with this stem 4 by cooperation of its Breguet toothing 5a with that of a sliding pinion (not shown) when the winding stem is in the winding position.
  • the mobile 6 is called “mobile crown” because it meshes on the one hand with the winding pinion 5 and on the other hand with the ratchet 7.
  • This mobile crown 6 comprises an axis (not shown), a first crown wheel 61, a second crown wheel 62, a crown star wheel 63 integral with the second crown wheel 62 - the wheels 61, 62 and the star wheel 63 typically being mounted free to rotate on said axis - as well as two jumpers 641, 642 carried by the first crown wheel 61 and engaged in the toothing of the crown star 63.
  • the jumpers 641, 642 are typically part of a one-piece assembly 64 fixed to the first crown wheel 61, said assembly 64 comprising a rigid ring, fixed to the first crown wheel 61, said ring carrying two beaks which are connected to it by elastic arms. Each of said spouts is held against the star 63 by the elastic arm which connects it to the ring.
  • the one-piece assembly 64 could advantageously form a one-piece assembly with the first crown wheel 61. It could comprise a single jumper jumper or more than two jumpers, for example three or four. In the case where the assembly 64 comprises more than two jumpers, these would advantageously be uniformly distributed around the star 63.
  • each of the jumpers 641, 642 The stiffness of the elastic arms of each of the jumpers 641, 642 is chosen so that they make it possible to secure the first crown wheel 61 and the second crown wheel 62 as long as the torque required to wind the mainspring of the barrel does not exceed a certain threshold value, this value corresponding to the optimum level of winding of the barrel spring as defined previously.
  • the system comprising the jumpers 641, 642 and the star 63 of crown mobile 6 transmits the torque received by first crown wheel 61 to second crown wheel 62.
  • Jumpers 641 and 642 remain engaged in the toothing of star wheel 63, as illustrated in figure 1 .
  • the crown mobile 6 operates like a conventional single crown wheel.
  • the pivoting of the first crown wheel 61 by actuation of the winding stem 4 does not cause any movement of the second crown wheel 62.
  • the force of the elastic arms of the jumpers 641, 642 does not allow them to remain in the toothing of the star 63.
  • the jumpers 641, 642 will therefore rise and let the teeth of star 63, as shown in picture 2 .
  • the crown mobile 6 is therefore a clutch mobile. It makes it possible to disengage between the first crown wheel 61 and the second crown wheel 62 when the mainspring is sufficiently armed.
  • the mechanism 1 avoids any overvoltage and thus makes it possible to avoid the risk of breakage of the barrel even if the user continues to turn the winding stem while the barrel spring is fully wound.
  • This mechanism 1 also has the advantage of not creating any blockage which could cause breakage. Finally, it allows the user to feel the click when it occurs and thus to know when the barrel is sufficiently cocked. This allows him to avoid unnecessarily activating the winding crown.
  • a watch mechanism 10 also comprises a barrel and a winding mechanism for this barrel.
  • the barrel of mechanism 10 is identical to the barrel of mechanism 1 previously described.
  • the pins A', 12, 13 and 121 correspond respectively to the pins A, 2, 3 and 21 of the cylinder previously described.
  • the winding mechanism of mechanism 10 is also similar to that according to the first embodiment. It comprises a winding stem 14 and a winding pinion 15 equivalent to those 4 and 5 described in the first embodiment.
  • the mechanism 10 differs from the mechanism 1 in that it comprises a simple crown wheel 16 and in that its release wheel set includes the ratchet 17 unlike that of the first embodiment of the invention.
  • the ratchet 17 is not integral in rotation with the shaft 13 of the barrel. It is part of a clutch wheel comprising the ratchet 17, a star 18 coaxial with the ratchet 17 mounted on the shaft 13 and made integral in rotation with the shaft 13 by a square, and two jumpers 91 and 92 carried by the ratchet 17 and engaged in the toothing of star 18.
  • the jumpers 91 and 92 are identical to those 641, 642 of the first embodiment of the invention, they cooperate with the star 18 in the same way that the jumpers 641, 642 cooperate with the star 63.
  • the jumpers 91 and 92 are typically part of a one-piece assembly and advantageously form a one-piece assembly with the wheel which carries them, in this case the ratchet 17.
  • the stiffness of the elastic arms of each of the jumpers 91, 92 is chosen so that they make it possible to secure the ratchet 17 and the star 18 as long as the torque necessary to arm the spring of the barrel does not exceed a certain threshold value, as defined previously.
  • This embodiment has an additional advantage over the first embodiment presented. Indeed, in this embodiment, a toothed wheel is eliminated compared to the first mode of embodiment described and the "star 18 - springs 91-92" system allowing the clutch to be released can be integrated into the plate of the ratchet 17 so that it does not increase its dimensions. It is therefore more compact.
  • the jumpers 641, 642 or 91, 92 of the release wheel set are two in number and form part of a one-piece assembly 64 or 9 mounted on a wheel 61 or 17.
  • said one-piece assembly 64; 9 could have come from material with the wheel 61; 17 on which it is fixed.
  • the one-piece assembly 64; 9 could be replaced by more traditional jumpers comprising an inclined plane subjected to the action of an independent spring. These jumpers would typically be attached to said wheel 61; 17.
  • the release wheel set could comprise a single jumper instead of the two illustrated or even more than two, for example three or four.
  • the release mobile comprises more than two jumpers, these are typically distributed uniformly around the star.
  • the winding stem is intended to be manually operable by the user from outside the case of a watch.
  • the clutch is located in the kinematic chain going from the winding pinion to the barrel arbor.
  • this kinematic chain consists, successively, of the first crown wheel 61, of the assembly 64 comprising the jumpers 641, 642, of the crown star 63, of the second crown wheel 62 and of the ratchet 7.
  • this kinematic chain consists, successively, of the crown wheel 16, of the ratchet 17, of the one-piece assembly 9 carrying the jumpers 91 and 92, and of the star 18.
  • the winding of the barrel spring is done by the inner turn of the barrel spring via the barrel arbor.
  • the clutch would have to be located in the kinematic chain going from the winding pinion to the barrel arbor.
  • the slats engaged in the spider of the release wheel set and held in abutment against this star via elastic arms are jumpers and can solidarize in rotation the wheel which carries them with the star whatever the relative direction of rotation of said wheels and star.
  • the clutch release wheel is therefore bidirectional even if, in practice, it will only operate in one direction corresponding to the direction leading to the winding of the mainspring.
  • a wolf-tooth gear typically enables the torque applied to the winding crown to be transmitted to the crown wheel only when the latter is pivoted in a predetermined direction leading to winding of the mainspring.
  • the replacement of said jumpers by pawls one-way operation is also entirely possible.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
EP21200712.4A 2021-10-04 2021-10-04 Uhrwerkmechanismus Pending EP4160320A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21200712.4A EP4160320A1 (de) 2021-10-04 2021-10-04 Uhrwerkmechanismus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21200712.4A EP4160320A1 (de) 2021-10-04 2021-10-04 Uhrwerkmechanismus

Publications (1)

Publication Number Publication Date
EP4160320A1 true EP4160320A1 (de) 2023-04-05

Family

ID=78078064

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21200712.4A Pending EP4160320A1 (de) 2021-10-04 2021-10-04 Uhrwerkmechanismus

Country Status (1)

Country Link
EP (1) EP4160320A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1845425A1 (de) * 2006-04-12 2007-10-17 Montres Breguet S.A. Uhr mit Schlagwerk, das ein einziges Federhaus umfasst
CH697924B1 (fr) * 2004-04-14 2009-03-31 Meco Sa Grenchen Couronne pour pièce d'horlogerie avec dispositif de débrayage.
CH703483A2 (fr) * 2010-07-30 2012-01-31 Seiko Instr Inc Rouage de remontage à limitation de couple, mouvement et pièce d'horlogerie équipé d'un tel rouage.
EP3705949A1 (de) * 2019-03-05 2020-09-09 ETA SA Manufacture Horlogère Suisse Drehmomentbegrenzungsmechanismus eines uhrwerks

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH697924B1 (fr) * 2004-04-14 2009-03-31 Meco Sa Grenchen Couronne pour pièce d'horlogerie avec dispositif de débrayage.
EP1845425A1 (de) * 2006-04-12 2007-10-17 Montres Breguet S.A. Uhr mit Schlagwerk, das ein einziges Federhaus umfasst
CH703483A2 (fr) * 2010-07-30 2012-01-31 Seiko Instr Inc Rouage de remontage à limitation de couple, mouvement et pièce d'horlogerie équipé d'un tel rouage.
EP3705949A1 (de) * 2019-03-05 2020-09-09 ETA SA Manufacture Horlogère Suisse Drehmomentbegrenzungsmechanismus eines uhrwerks

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