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
  • G04D7/08—Measuring, counting, calibrating, testing or regulating apparatus for balance wheels
  • G04D7/082—Measuring, counting, calibrating, testing or regulating apparatus for balance wheels for balancing
  • G04D7/085—Measuring, counting, calibrating, testing or regulating apparatus for balance wheels for balancing by removing material from the balance wheel itself
  • G04D7/087—Automatic devices therefor (balancing and loading or removing carried out automatically)
• • 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
• • 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
  • Y10T29/49579—Watch or clock making
  • Y10T29/49581—Watch or clock making having arbor, pinion, or balance

Definitions

• the invention relates to a method for producing and putting inertia or / and balancing a pendulum-balance assembly mounted in a clock oscillator mechanism which comprises, mounted on a platinum bearing a pin by the intermediate of a cock, said sprung-balance assembly comprising a balance pivoting about a pivot axis and a spiral, of which an inner turn is fixed to said balance or to a ferrule mounted integral with said balance and of which an outer turn is fixed to said Piton for his maintenance to cock.
• the invention relates to the field of clock oscillator mechanisms spiral balance.
• the document FR 2 179 744 A1 FAR describes a method for balancing and adjusting the oscillation frequency of a sprung balance, by removal of material at the cutting tool, at the level of the strut of the balance, in correlation with measuring and control means, without special protection of the hairspring.
• CH 532 284 A SUWA SEIKOSHA KK discloses a rotor balancing apparatus, and a resumption of the balance, with the hairspring fixed to the ferrule. This recovery is performed with a drill, which requires the stop and the maintenance of the pendulum for the execution of the machining operation.
• CH 704 21 1 A2 SWATCH GROUP R & D relates to a protection of the spiral against electromagnetic radiation, and this document indicates a rule of proportion between the diameter of the balance and the diameter of the outer coil of the spiral, without mentioning the end curve and attachment to the peak, or possible contacts with a racket.
• the invention proposes to ensure the safety of the hairspring of a balance-hairspring assembly, when placing inertia or balancing of the balance when said hairspring and this balance are already assembled to one another, and in particular when the sprung balance assembly is already mounted in the watch movement.
• the difficulty is to prevent any alteration of the spiral when the resumption of the pendulum.
• the invention relates to a method for producing and putting inertia or / and balancing a balance-spiral assembly mounted in a clock oscillator mechanism which comprises, mounted on a carrier plate of a stud by means of a cock, said sprung-balance assembly comprising a balance pivoting about a pivot axis and a spiral, of which an inner turn is fixed to said balance or to a ferrule mounted integral with said balance and including a turn is attached to said pin for its support to said cock, characterized in that:
• said pendulum and said hairspring are manufactured, and they are irreversibly assembled to one another by fixing said inner coil to said rocker arm or to said ferrule mounted integral with said rocker arm; the said outer turn is fixed in position, in a foolproof manner, to the said pin which is immobilized in a foolproof manner by an irreversible fixation with respect to said cock;
• a recovery machining technology is chosen for the inertia setting and / or balancing of said balance by removal of material from tool machining or by abrasion or projection of a laser or plasma beam or by projecting a fluid jet, said recovery machining technology being implemented by a recovery means comprising means for ablation and / or reloading and / or deformation and / or heat treatment;
• the value of a first difference is defined, constituting the minimum distance between any point of said balance spring and a machining recovery zone for placing the inertia or / and balancing said balance;
• a peripheral surface devolving to the setting of inertia or / and the balancing of said balance, at the periphery of said balance, is determined as said machining recovery zone, any point of said surface being remote from said spiral of at least the value said first predefined deviation, to prevent any change in the characteristics of said hairspring during an irreversible machining resumption of said beam on said peripheral surface for the inertia setting and / or balancing of said balance on said assembled balance-hairspring assembly;
• the value of a second deviation greater than or equal to said first deviation and constituting the minimum distance between said peak and said peripheral surface distant from said peak of a greater value is defined; at a second predefined gap, to prevent any change in the characteristics of the attachment of said hairspring to said peg when resuming machining of said balance on said peripheral area for the inertia setting and / or balancing said balance on said assembly assembled;
• FIG. 1 shows schematically and in perspective, a sprung-balance assembly according to the invention
• FIG. 2 shows, schematically and in perspective, the outer end of a hairspring in a preferred embodiment of the invention
• Figure 3 shows schematically and in section passing through its pivot axis, the sprung balance assembly of Figure 1;
• FIG. 4 shows, schematically and in top view, a detail of a single adjustment means of a rocker devolved especially after-sales;
• Figure 5 shows, schematically and in section passing through its pivot axis, a groove detail in the sprung balance assembly of Figure 1;
• FIG. 6 schematically and in plan view, the assembly of FIG. 1 mounted between a bridge and a cock, which has a recess for channeling a suction flow in the alignment of an orifice of FIG. a platinum;
• Figure 7 is a local section of this figure 6;
• FIG. 8 is a block diagram showing a watch comprising a movement enclosing such a balance-spiral assembly.
• the invention thus relates to a clock oscillator mechanism 10, intended to be incorporated in a watch movement 100, and comprising, mounted on a plate 8 carrying a pin 7 via a cock 80, to at least one pendulum balance-balance unit comprising a rocker 2 pivoting about a pivot axis D and a spiral 3.
• An inner coil 4 of this spiral 3 is fixed to the balance 2 or to a ferrule 5 mounted integral with the balance 2, and an outer turn 6 of this hairspring 3 is fixed to the pin 7 to hold it to the plate 8 or to the cock 80.
• the invention is described here in the particular case of a single and single spring balance regulator member, the person skilled in the art will be able to extrapolate the invention to the case of several rockers and / or several spirals.
• the rocker 2 comprises a machinable peripheral surface 20, which is spaced from any point of the spiral 3 by a value greater than a first predefined distance E1, to prevent any modification of the characteristics. spiral 3 during an irreversible machining resumption of the balance 2 on the peripheral surface 20 machinable for the implementation of inertia and / or the balancing balance 2 on the assembly 1 assembled.
• machining By resuming machining is understood here any operation likely to locally modify the inertia of the pendulum: addition of material, displacement of material, removal of material.
• This operation can be done, without limitation, by taking up the cutting or abrading tool (milling, turning, grinding or similar), by laser, in particular a picolaser or even a femtolaser, by spraying material by jetting, by deformation under the action of a tool, by localized fusion, by heat treatment modifying the structure of the material, or other.
• any area 25 of the beam 2 located below the machinable peripheral surface 20 is made with at least its surface comprising a heat treatment and / or a surface treatment conferring on it a greater resistance to the normal to a machining tool or by abrasion or laser, or / and is made of a material resistant to machining by tool or abrasion or laser.
• first difference E1 can be understood, in the most general case, in any position of the hairspring 3, it is also possible to set particular deviation values specific to each of certain specific positions of the hairspring: at rest, in positive amplitude maximum oscillation amplitude, maximum negative oscillation amplitude, or other.
• peripheral surface 20 is distant from the radially most eccentric point of the active part (that is to say subjected to oscillation) of the outer turn 6 of the spiral 3 of a value greater than this first gap E1.
• the first predefined distance E1 is greater than 0.50 mm.
• the first predefined distance E1 is between 0.50 mm and 1, 20 mm.
• the first predefined distance E1 is between 0.50 mm and 0.70 mm.
• the hairspring 3 is bent into a bend 31 and / or twisted into a twisting zone 32, at or near its attachment to the peg 7 so as to move away from the peripheral surface 20 the active portion 61 of the outer turn 6 of the hairspring 3.
• This active portion 61 of the hairspring 3 is thus remote from the peripheral surface 20 of machining resumption of the balance 2, and preferably from a distance greater than 2/3 of the radial grip of the peripheral surface 20, which is annular in projection in a plane perpendicular to the pivot axis D.
• the peripheral surface 20 is distant from the piton 7 by a value greater than a second predetermined distance E2, to prevent any modification of the characteristics of the hairspring 3 during a resumption of machining the balance 2 on the peripheral zone 20 for the inertia setting and / or the balancing of the balance 2 on assembly 1 assembled. And in particular to prevent any modification of the characteristics by indirect heating of the hairspring 3.
• the second predefined gap E2 is greater than 0.05 mm.
• This second predetermined difference E2 is preferably between 0.05 mm and 0.20 mm. In a particular application, the second predefined difference E2 is between 0.05 mm and 0.10 mm.
• the second difference E2 can be understood, in the most general case, in any position of the hairspring 3, it is also possible to set particular values of deviation specific to each of certain specific positions of the hairspring: at rest, in positive amplitude maximum oscillation amplitude, maximum negative oscillation amplitude, or other.
• the peripheral surface 20 is accessible from at least one side of the balance 2 to an ablation means and / or reloading and / or deformation and / or projection and / or heat treatment in a volume outside a first surface 21.
• This first surface 21 is of revolution about the pivot axis D, and is based on the minimum radius 201 of the peripheral surface 20.
• the first surface 21 is, again, at a distance greater than a third distance E3 of any active point of the hairspring 3 to prevent any change in the characteristics of the hairspring 3 during a resumption of machining of the balance 2 on the peripheral surface 20 for the inertia setting and / or balancing of the balance 2.
• the first surface 21 is a cone whose vertex S1 is on the same side as the spiral 3 with respect to the balance 2.
• the figures illustrate a simplified case of recovery of inertia of the balance 2 on one side, said upper 2A.
• the first surface 21 is composed of two half-surfaces, one on each side of the beam of the beam 2, for example with two portions of cones of opposite openings.
• the access volume to the modification means of the inertia of the balance 2 to the peripheral surface 20 is limited, not only on the side of the spring 3 by the first surface 21, but also, on the outer side, by a second surface 22.
• the peripheral surface 20 is accessible from at least one side of the rocker 2 to a means for ablation and / or reloading in a volume delimited by two surfaces coaxial with the pivot axis D, a first surface 21 based on the minimum radius 201 of the peripheral surface 20 and at a distance greater than a third distance E3 from any active point of the hairspring 3 to prevent any change in the characteristics of the hairspring 3 during a resumption of machining of the rocker 2 on the peripheral surface 20 for the inertia setting and / or balancing of the balance 2, and a second surface 22 resting on another radius 202 of the peripheral surface 20 and greater than the minimum radius 201 and defining a protective envelope of the clock mechanism surrounding the sprung-balance assembly 1 during a resumption of machining of the balance 2 on the peripheral surface 20 for the setting of inertia and / or balancing of the balance 2 on the assembly 1 assembled.
• this second surface 22 is intended to ensure the protection of the spiral 3 against a direct projection, or indirectly by reflection or ricochet, of a chip or other waste, on a surface of the balance, or a bridge , or a rooster.
• the second surface 22 is a cone whose apex S2 is on the opposite side to the spiral 3 with respect to the rocker 2.
• the first surface 21 and the second surface 22 together define, in a section passing through the pivot axis D, an angle ⁇ less than a predetermined value ⁇ itself less than 45 °.
• the tangent to the first surface 21 at the peripheral surface 20, in the plane of the pivot axis D, makes, with the pivot axis D, in a section passing through the pivot axis D, an angle ⁇ less than a predetermined value ⁇ , which is linked to the predefined value E3.
• the tangent to the second surface 22 makes, with the pivot axis D, in a section passing through the pivot axis D, an angle ⁇ smaller than a predetermined value D.sub.0. In a particular application, this angle OD is 45 °.
• the value of the third difference E3 is advantageously between 100% and 120% of the value of the first difference E1, and preferably the value of the third difference E3 is equal to the value of the first difference E1.
• the sprung balance assembly 1 is designed to be set at the factory for its theoretical walk, and has no moving element whose improper handling can create a significant time error.
• the hairspring 3 is foolproof, that is to say that this balance-hairspring assembly 1 does not include a raquet, nor element for acting on the hairspring 3 or on its peg 7 which is also foolproof .
• the rocker 2 comprises at most inertia adjustment means whose adjustment range is very small, with very little regulating power, for example a few seconds or a few tens of seconds per day.
• These means are for example constituted by visselottes, which are held stationary in a so-called recovery position, which is either a fixed position determined for example by a notch, or which is a bearing position on an abutment surface.
• recovery position which is either a fixed position determined for example by a notch, or which is a bearing position on an abutment surface.
• These jackets are maintained in this fixed position of recovery for the duration of the resumption of machining inertia setting and / or balancing. Their reduced adjustment range is only used after-sales.
• the rocker 2 comprises at least two housings 28, each arranged for receiving a set screw 9 mounted prisoner on either side of a peripheral section 29 of the rocker 2.
• This screw 9 is movable only between a first stop position 91 on the balance 2, on which a first head 93 that includes the screw 9 is held in abutment during a factory setting in which is performed the irreversible machining of the balance 2, and a second stop position 92 defining an end of stroke of a second head 94 that includes this screw 9.
• the difference PR between the first stop position 91 and the second stop position 92 limits the regulating power of the screw 9, which The regulating power is preferably limited to 30 seconds per day for after-sales needs. In a particular embodiment, as can be seen in FIG.
• the balance 2 thus comprises, as sole adjustment means, adjusting screws 9 that are only movable between a first stop position 91 on the balance 1 on which their head 93 is in position. support in factory setting, and a second stop position 92 limiting their power regulation limited to 30 seconds per day for the needs of after-sales.
• These adjustment screws 9 constitute the only adjustable elements in service of this balance-sprung assembly 1, after the irreversible machining inertia setting or / and balancing done in the factory. It is understood that, in the case of the presence of adjusting screws, the inertia setting and the balancing necessarily take place with the adjusting screws in an abutment position.
• the balance 2 does not contain any adjustment means.
• the sprung balance 1 is then free of any raquetterie and any adjusting means in use.
• the rocker 2 is machined for its inertia setting and / or its equilibration in the form of narrow grooves S, of depth P greater than at least once their width L, and preferably greater than at least three times their width L.
• the spiral 3 may be made of silicon or silicon oxide or monocrystalline diamond or polycrystalline diamond or glass or metal glass or amorphous metal or quartz or a paramagnetic material or a ferromagnetic ferromagnetic material or antiferromagnetic alloy.
• the spiral 3 is thermally pretreated so as to withstand localized heating in a neighboring zone during a resumption of operation. machining of the balance 2 on the peripheral surface 20 for the implementation of inertia and / or balancing of the balance 2.
• the invention also relates to a clock oscillator mechanism 10 comprising at least one balance-spiral assembly 1 with spiral 3 unmountable without raquetry mounted on a plate 8 carrying a pin 7 via a cock 80.
• the cock 80 is of unobstructed shape, and comprises at least one clearance 81 to facilitate a suction flow created in the mechanism 10 when a resumption of machining of the balance 2 on the peripheral surface 20 for the implementation of inertia and / or balancing the balance 2 on the assembly 1 assembled.
• the suction would indeed be inefficient in the presence of two platinum surfaces 8 and 80 cock face to face on both sides of the balance 2
• the plate 8 or a cock 80 that it has in the vicinity of this sprung-balance assembly 1 comprises at least one through hole 82 to facilitate a suction flow created in the mechanism 10 during a machining recovery.
• the balance 2 on the peripheral surface 20 for the implementation of inertia and / or balancing of the balance 2 on the assembly 1 assembled.
• a surface treatment or protection prohibiting cutter or laser material removal for example, reflective surface protection in the latter case
• the inner portion under this threshold diameter being made of a material prohibiting a removal of material by cutting tool or laser.
• the invention also relates to a watch movement 100 comprising such an oscillator mechanism 10 with balance-spiral assembly 1 spiral 3 foolproof, with piton 7 foolproof, without raquetterie and without other adjusting means in service that the set screws 9 described upper.
• the clockwork movement 100 comprises such an oscillator mechanism 10 with a balance spring-balance 1 with a spiral 3 which can not be adjusted, with an inaccessible peak 7, without adjustment and without any adjustment means in service.
• the invention also relates to a timepiece 200 comprising at least one such movement 100, preferably this piece 200 is a watch.
• the invention relates to a method for producing and putting inertia or / and balancing a balance-sprung assembly 1 mounted in a clock oscillator mechanism 10 which comprises, mounted on a plate 8 carrying a peak 7 by means of a cock 80, the balance 1 balance-balance comprising a rocker 2 pivoting about a pivot axis D and a spiral 3, including a turn 4 is attached to the balance 2 or to a ferrule 5 mounted integral with the balance 2 and an outer turn 6 of which is fixed to the pin 7 for its maintenance at the cock 80.
• the pendulum 2 and the hairspring 3 are manufactured, and they are irreversibly assembled to one another by fixing the inner turn 4 of the hairspring 3 to the rocker 2 or to the shell 5 mounted integral with the rocker 2;
• the outer turn 6 of the spiral 3 to the stud 7 is fixed in a foolproof manner and is fixed in a foolproof manner by an irreversible fixation relative to the cock 80;
• a recovery machining technology is chosen for the inertia setting and / or balancing of the balance 2 by removal of material from machining with the tool or by abrasion or by projection of a laser or plasma beam or by projecting a jet of fluid, the recovery machining technology being implemented by a recovery means comprising means of ablation and / or reloading and / or deformation and / or heat treatment;
• a first difference E1 constituting the minimum distance between any point of the hairspring 3 and a machining recovery zone for the inertia setting, is defined according to the choice of the rework machining technology. / and balancing balance 2;
• a peripheral surface 20 devolved to the setting of inertia or / and balancing of the rocker 2, at the periphery of the rocker 2, is determined as said machining recovery zone, any point of the surface 20 being remote from the spiral 3 at least the value of the first predefined distance E1, to prevent any modification of the characteristics of the hairspring 3 during an irreversible machining resumption of the balance 2 on the peripheral surface 20 for the inertia setting and / or balancing the pendulum 2 on the assembled sprung balance 1 assembly;
• a second difference E2 greater than or equal to the first distance E1 and constituting the minimum distance between the peak 7 and the peripheral surface 20 distant from the peak 7 is defined, depending on the choice of the recovery machining technology. a value greater than a second predefined distance E2, to prevent any modification of the characteristics of the attachment of the spiral 3 to the stud 7 during a resumption of machining of the balance 2 on the peripheral zone 20 for the setting of inertia and / or balancing of the balance 2 on the assembly 1 assembled;
• the trajectory of the recovery means is limited to internal volume to a second surface 22 based on the maximum radius 202 of the peripheral surface 20 and defining a protective envelope of the oscillator mechanism 10 and a shield of the spiral 3 against a direct projection, or indirect any chip or other waste, the second surface 22 being a cone of second vertex S2 oriented on the pivot axis D and whose second apex angle ⁇ is less than a second predetermined value ⁇ 0.
• the first vertex S1 of the first surface 21 is on the same side as the spiral 3 with respect to the balance 2.
• the second vertex S2 is on the opposite side to the balance spring 3 with respect to the pendulum 2.
• the first surface 21 and the second surface 22 together define, in a section passing through the pivot axis D, a third angle ⁇ smaller than a third predetermined value ⁇ less than 45 °.
• the second predetermined value ⁇ 0 is 45 °.
• any zone 25 of the rocker 2 located below the peripheral surface 20 is produced, and whose distance from the pivot axis D is less than the minimum radius 201 of the peripheral surface 20, with at least its surface having a heat treatment and / or a surface treatment giving it a resistance greater than the resistance of the peripheral surface 20 to machining by tool or abrasion or by laser, or / and the zone 25 is made of a material more resistant than the peripheral surface 20 to tool or abrasive or laser machining.
• At least one said zone 25 is made with a surface treatment of carburizing or nitriding.
• At least one said zone 25 is produced with a metallization surface treatment to render its reflective surface to the laser beams in the usual wavelengths for the machining lasers.
• the spiral 3 is made before it is attached to the balance 2, with its said outer turn 6 bent and / or twisted at its attachment to the stud 7 so as to move away from the peripheral surface.
• the plate 8 or / and the cock 80 are made in such a way as to allow access of the recovery means to the peripheral surface 20.
• the pendulum 2 is machined in the form of narrow grooves S of greater depth P at one time their width L.
• the spiral 3 is made of silicon or silicon oxide or monocrystalline diamond or polycrystalline diamond or glass or glass metal or amorphous metal or quartz or a paramagnetic material or a ferromagnetic material or antiferromagnetic alloy.
• the ends of the hairspring 3 are fixed in position, in a foolproof manner, relative to the pendulum 2 on the one hand and to a pin 7 which is immobilized in a foolproof manner by an irreversible fixation with respect to a platinum 8 or a rooster 80 of a movement 10;
• any adjustment means 9 of the rocker arm are immobilized in a recovery position
• the outer turn 6 is fixed in position, in a foolproof manner, to the pin 7 which is immobilized in a foolproof manner by an irreversible fixation with respect to the plate 8 or the cock 80 of the movement 10;
• each adjustment screw 9 of the balance 2 is immobilized in a first stop position 91 on the balance 2 in which a first head 93 that includes the screw 9 is held in abutment on a peripheral section 29 of the balance 2.
• the first predefined distance E1 is selected with a value of between 0.50 mm and 1, 20 mm.
• the first predefined distance E1 with a value between 0.50 mm and 0.70 mm is chosen.
• the second predetermined difference E2 with a value between 0.05 mm and 0.20 mm is chosen.
• the second predefined distance E2 with a value between 0.05 mm and 0.10 mm is chosen.
• the plate 8 or / and the cock 80 are made so that the peripheral surface 20 is accessible from at least one side of the balance 2 to an ablation means or and / or reloading and / or deformation and / or heat treatment in a volume outside a first surface 21 of revolution about the pivot axis D and based on the minimum radius 201 of the peripheral surface 20 and a distance greater than a third distance E3 from any active point of the hairspring 3 to prevent any change in the characteristics of the hairspring 3 during an irreversible machining resumption of the rocker 2 on the peripheral surface 20 for the inertia setting and / or balancing the pendulum 2.
• a first surface 21 is chosen which makes, with the pivot axis D, in a section passing through the pivot axis D, an angle ⁇ less than a predetermined value ⁇ .
• the balance 2 is equipped with at least two housings 28 each arranged for the reception of a setting screw 9 mounted on either side of the peripheral section 29 of the balance 2, and where the screw 9 is movable only between the first stop position 91 on the rocker 2 on which a first head 93 that includes the screw 9 is held in abutment at the factory setting during which is performed the irreversible machining of the balance 2, and a second stop position 92 defining a limit of a second head 94 that includes the screw 9, the difference between the first stop position 91 and the second stop position 92 limiting the regulating power of the screw 9, which power regulation is limited to 30 seconds per day for the needs of after-sales.
• the spiral 3 prior to its attachment to the balance 2, is thermally pretreated so as to withstand localized heating in a neighboring zone during a resumption of machining of the balance 2 on the peripheral surface 20 for placing the inertia and / or balancing of the balance 2.
• the rooster 80 is made with an unobstructed shape and having at least one clearance 81 through which a suction flow is circulated that is created in the mechanism 10 during the recovery of machining of the balance 2 on the peripheral surface 20 for the implementation of inertia and / or balancing of the balance 2 on the assembly 1 assembled.
• the plate 8 is made with at least one through hole 82 to facilitate a suction flow that is created in the mechanism 10 during the resumption of machining of the balance 2 on the surface.
• the oscillator mechanism 10 is adjusted aftermarket with the only adjustment means being the screws adjustment 9 of the balance 2.
• an envelope volume of action of the machining recovery means is defined, at least beyond a first surface 21 as defined above, and the opposite side to the hairspring 3. with respect to this first surface 21.
• the machining recovery means namely, as the case may be, the axes of the laser or plasma beams or the like, machining pins in directions such as the thermal effects or the chips or dust emitted do not come into the grip of the hairspring.
• these axes are oriented in the angle sector ⁇ , of value equal to the angle ⁇ , as visible in Figure 3, so that the reflection of the rays, flux, chips and dust is done away from the spiral 3.
• the invention is well suited, in particular, to the machining of inertia recovery and / or balancing in an assembled motion.
• the definition of a second envelope surface 22 of security as presented above, protects the other components of this movement, it is then ensured that the reflection of the streams and waste remains between the two surfaces 21 and 22.
• the presence of a suitably oriented suction flow in particular ascending from S2 to S1 in the example of FIG. 3, makes it possible to further improve this safety, and to ensure the cleanliness of the movement 10 after this operation. of recovery.
• the movement 10 after its last adjustment of operation constituted by this operation of recovery of inertia and / or balancing of the balance, no longer undergoes adjustment in the factory. If the balance is equipped with adjustment screws 9, as explained above, the after-sales service then has a limited adjustment range.
• the invention makes it possible to prevent any alteration of the balance spring during the recovery of the balance.
• An induced effect is to facilitate the irreversible balancing machining, thanks to particular geometrical characteristics.

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• Physics & Mathematics (AREA)
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• 2012
  • 2012-11-06 EP EP12191481.6A patent/EP2728423A1/de not_active Withdrawn
• 2013
  • 2013-10-22 WO PCT/EP2013/072011 patent/WO2014072168A1/fr active Application Filing
  • 2013-10-22 US US14/441,062 patent/US10114341B2/en active Active
  • 2013-10-22 JP JP2015540094A patent/JP5925392B2/ja active Active
  • 2013-10-22 EP EP13782685.5A patent/EP2917792B1/de active Active
  • 2013-10-22 CN CN201380057773.7A patent/CN104769512B/zh active Active
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• 2015
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