• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a method for fixing a motor spring (1) intended to be mounted inside a watch engine cylinder, the engine cylinder comprising a barrel shaft (3), a drum and means for fastener (20) for coupling the mainspring (1) to the shaft (3) or to the drum; the fastening means (20) comprising a receiving device (22, 24, 25) comprising a housing (21), the receiving device (22, 24, 25) being configured to receive an end (10) of the mainspring in the housing (21) and for mechanically clamping said end (10) of the motor spring when it is introduced into the housing (21); the method comprising: introducing the end (10) of the mainspring into the housing (21); mechanically holding the end (10) of the mainspring in the housing (21); injecting a fluid into the housing (21), the fluid being able to solidify when it dries and / or cools; and solidifying the fluid so as to fix the end (10) of the motor spring in the fastening means (20).
    公开号:CH711698A2
    申请号:CH01365/16
    申请日:2016-10-12
    公开日:2017-04-28
    发明作者:Guerlesquin Gaël；Avril Christophe
    申请人:Cartier Int Ag；
    IPC主号:
    专利说明:

    TECHNICAL FIELD [0001] The present invention relates to a method of fixing an engine spring intended to be mounted inside a watch engine cylinder.
    STATE OF THE ART [0002] The barrel is the energy reserve of a mechanical watch. It comprises in particular a drum, cooperating with a gear train, and which is arranged to receive, in an inner chamber, at least one spiral spring motor which is hooked at its inner end to a shaft or a bung. The receiving chamber of the spring is generally closed by a cover, or directly by the reed usually coming on the shaft or on the bung.
    The motor spring is fixed by its inner end to the shaft through a bung and its outer end to the drum by means of a flange. Springs made of metal alloys such as Nivaflex ™ are typically attached to the bung by a hook on the bung which attaches to an eyelet in the spring, and to the flange by a blade attached and welded to the spring. Such fasteners are, however, incompatible for springs made of certain materials, such as a spring made of composite material comprising fibers dispersed in a polymer matrix as described in documents EP 2 455 820 and WO 2013 083 494. In particular with such a composite material, the formation a grommet can affect the continuity of the fibers, and the welding operation is very difficult with a polymeric material. It has been proposed to make the attachment of the ends of a motor spring composite material using glue. However, this makes the operations of assembling the mainspring in the barrel complex and difficult to repeat, and these operations also generate the risk of aging of the bonding and the risk of congestion of the bung and the flange.
    The document EP 2 657 794 describes a method of manufacturing a watch barrel shaft, the shaft comprising a groove in which is housed the inner end of a motor spring. Document CH 506 109 describes a method for manufacturing a spiral and attaching it to a ferrule. The ferrule comprises an opening in which the inner end of the spring is fixed by clamping, gluing or welding.
    BRIEF SUMMARY OF THE INVENTION [0005] The present invention relates to a method of fixing a motor spring intended to be mounted inside a watch engine cylinder, the engine cylinder comprising a barrel shaft, a drum and fastening means for coupling the mainspring to the shaft or drum; the fixing means comprising a receiving device comprising a housing, the receiving device being configured to receive an end of the spring in the housing and to mechanically hold said end of the motor spring when it is introduced into the housing; the method comprising: introducing the end of the mainspring into the housing; mechanically hold the end of the mainspring in the housing; injecting a fluid into the housing, the fluid being able to solidify when it dries and / or cools; and solidifying the fluid so as to fix the end of the motor spring in the fastening means.
    This solution has the advantage over the prior art to allow good repeatability of the fixing operation of the motor spring in the barrel and the possibility of automation. The aging of the binding as well as the size of the bung and the flange can also be reduced. The method of the invention also allows a better resistance to a torque up to five times greater maximum torque arming. Other advantages of the method will become apparent from the description which follows.
    Brief Description of the Figures [0007] Examples of implementation of the invention are indicated in the description illustrated by the appended figures in which:
    Fig. 1 illustrates a plug for fixing a motor spring on a shaft of a motor cylinder, according to one embodiment; fig. 2 shows a sectional view of the bung of FIG. 1; fig. 3 shows a view from above of the bung of FIG. 1; fig. 4 illustrates the bung in which the inner end of the mainspring has been introduced and after a step of injecting a fluid, according to one embodiment; fig. 5 is a sectional and exploded view of the bung and an injection lid, according to one embodiment; fig. 6 shows the cover positioned on the bung according to FIG. 5, once mounted on a pose and before the injection; fig. 7 show a flange for fixing an outer end of the mainspring to the drum of the barrel, according to one embodiment; fig. 8 shows flange of FIG. 7 fixed on the barrel drum, according to one embodiment; fig. 9 illustrates a motor spring whose inner end is fixed to the bung and the outer end is fixed to the flange, according to the method of the invention.
    Example (s) of Embodiment of the Invention [0008] FIG. 1 illustrates fastening means intended to allow the attachment of a motor spring 1 inside a watch winding engine cylinder manual or automatic. In particular, FIG. 1 shows a bung 20 for fixing an inner end 10 of the motor spring 1 to a shaft 3 of the barrel. Fig. 2 shows a sectional view of the plug 20 of FIG. 1 and FIG. 3 shows a view from above of the plug 20 of FIG. 1.
    The bung 20 is mounted on the shaft 3 of the barrel. It comprises a central ring 25 mounted on the shaft 3 and a peripheral ring 22 arranged concentrically around the shaft 3. The peripheral ring 22 is arranged to form a housing 21 between the peripheral ring 22 and the central ring 25 .
    The peripheral ring 22 has an opening 24 so that the inner end 10 of the motor spring can be introduced into the housing 21 through the opening 24. Preferably, a holding by clamping the inner end 10 of the spring motor in the housing 21 is provided by a central ring rotation 25 relative to the peripheral ring 22. This can be achieved in that the inner diameter of the peripheral ring 22 and the outer diameter of the central ring 25 are asymmetrical.
    According to the variant illustrated in FIG. 1, the asymmetry is obtained by the central ring 25 in the form of a snail cam. Alternatively, or in combination, the asymmetry can be obtained by a projection 26 included on the face of the peripheral ring 22 in contact with the inner end 10 of the mainspring.
    According to one embodiment, a method of fixing the mainspring comprises the steps of: introducing an end of the motor spring into the housing 21; injecting a fluid 27 into the housing 21, the fluid being able to solidify when it dries and / or cools; and solidifying the fluid so as to fix the end of the motor spring in the fastening means.
    According to a variant of this embodiment, the method also comprises the step of mechanically tightening the peripheral ring 22 on the spring, here by rotation of the central ring 25 before the step of injecting the fluid.
    In the example illustrated in FIGS. 1 and 2, the inner end 10 of the motor spring is introduced into the housing 21 between the peripheral ring 22 and the central ring 25. To this end, the peripheral ring 22 may comprise the opening 24 allowing the passage of the inner end 10 of the mainspring.
    Once the inner end 10 of the motor spring is introduced into the housing 21, the fluid 27 is injected so as to fill more or less the housing. The injected fluid 27 fills the spaces left free between the inner end 10 of the mainspring and the peripheral and central rings 22, 25.
    It is advantageous that the injected fluid can well wet the surfaces of the inner end 10 and rings 22, 25 so as to fill the gaps left free. The fluid 27 has the property of being able to be injected in the liquid form and to solidify when it is dried. Alternatively, or in combination, the fluid has the ability to be injected in the liquid form at an injection temperature, typically higher than the operating temperature of the engine cylinder (for example the temperature of the part), and to solidify when cooled. During solidification, the fluid freezes and fixes the end 10 of the motor spring on the bung 20.
    The fluid is preferably a resin. The fluid can however also be a polymer, a metal or any other liquid material that solidifies when it dries and / or cools. The fluid 27 may also comprise a material which is not initially in liquid form but which takes this form only after heating. For example, the fluid 27 may initially be in the form of a powder which on heating, liquefies, then cooling, hardens.
    FIG. 4 illustrates the bung 20 in which the inner end 10 of the motor spring has been introduced between the peripheral ring 22 and the central ring 25 and after the step of injecting the fluid 27 into the housing 21. Comparing FIGS. 1 and 3, it can be seen that the entire space between the inner end 10 of the motor spring and the peripheral and central rings 22, 25 has been filled by the fluid 27.
    FIG. 5 is a sectional and exploded view of the bung 20, according to one embodiment in which a cover 23 is mounted on the bung 20 before the injection phase. In particular, the cover 23 is configured to attach to the peripheral ring 22 and the central ring 25 so as to close the housing 21. In this configuration, an orifice 28 may be provided in the cover 23 for the injection of the fluid 27.
    FIG. 5 also shows a possible assembly sequence of the bung 20 on the barrel. For example, the shaft 3 is mounted in a hub 32 provided in the bottom 31 of a setting. The peripheral ring 22 and the central ring 25 are then mounted concentrically with the shaft 3. The central ring 25 may be previously fixed to the shaft 3 or it may be in one piece with the shaft. The inner end 10 of the motor spring is then introduced into the housing 21 through the opening 24. The cover 23 is then placed on the rings 22, 25 so as to close the housing 21. FIG. 6 shows the plug 20 and the lid 23 according to FIG. 5, once mounted and ready to receive the fluid injection. The cover 23 may include a shaft insert 291 and a ring insert 292 for sealing at the shaft 3 and the peripheral ring 22, respectively. The fluid 27 is then injected through the orifice 28 and solidified. After solidification of the fluid, the cover 23 can be removed and the bung-spring assembly can be removed from the stand and mounted in a barrel drum (preferably with a fixation of the outer end of the spring to a flange in the manner described below). Alternatively, the spring can also be assembled in the drum with the lid.
    Figs. 7 and 8 show an embodiment in which the fixing means comprise a flange 40 intended to fix an outer end 11 of the mainspring to the barrel of the barrel. In particular, FIG. 7 shows an isolated view of the flange 40 comprising two clamping blades 41 defining a housing 21 'in which can be introduced the outer end 11 of the motor spring. Preferably, the outer end 11 of the motor spring is held by mechanical clamping in the housing 21 'because of the spring action of the two clamping blades 41. The flange also comprises a flange blade 42 which comes into contact with the wall inside the drum and an ankle 43 intended to rest in the bottom of the notch of the drum. In this example, the flange 40 is a fixed flange intended to be incorporated in a manual winding watch movement, but in variants the flange may be slippery.
    FIG. 8 shows the flange fixed on the drum 30 of the barrel. According to this variant shown, the pin 43 can be housed in a notch 34 of the drum 30. The flange 40 can also be pivotally mounted (not shown) on the drum as described in WO 2013 189 856. The flange 40 can also be a slippery flange, possibly metal, without questioning the spring-flange fixing principle.
    In the case of fixing the outer end 11 of the motor spring in the flange 40, the fluid 27 may be injected before the introduction of the outer end 11 between the lamellae 41.
    The fluid 27 is injected in the manner described above for the case of the bung 20. The injected fluid 27 fills the spaces left free between the outer end 11 of the motor spring and the clamping blades 41. The expected properties of the fluid are also like those described above.
    By way of example, the step of injecting the fluid 27 into the housing 21, 21 'can be carried out with a device of the type of plastic injection press in which the fluid 27 (a plastic material or other) is made fluid (for example by heating) and then injected into the housing 21,21 'and then cooled (solidified). In this case, the housing 21, possibly closed by the cover 23, serves as a mold. The device of the injection press type can ensure the positioning of the fixing means 20, 40 during the injection phase.
    Fig. 3 9 shows a motor spring whose inner end 10 is fixed to the bung 20 and the outer end 11 is fixed to the flange 40, according to the method of the invention.
    If the method of the invention is particularly suitable in the case of a barrel spring composite material, it is also applicable to springs made of other materials, such as metal springs, etc.
    Reference numerals used in FIGS. [0028] I motor spring 10 inner end of the motor spring II outer end of the motor spring 20 fastening means, plug 21 housing 21 'housing 22 receiving device, peripheral ring 23 cover 24 receiving device, opening 25 receiving device, central ring 26 protruding 27 fluid
    权利要求:
    Claims (18)
    [1]
    1. A method of fixing an engine spring (1) intended to be mounted inside a watch engine cylinder, the engine cylinder comprising a barrel shaft (3), a drum and fastening means (20). , 40) for coupling the motor spring (1) to the shaft (3) or to the drum; the fixing means (20, 40) comprising a receiving device (22, 24, 25, 41) comprising a housing (21, 21 '), the receiving device (22, 24, 25, 41) being configured to receive one end (10, 11) of the mainspring in the housing (21) and for mechanically clamping said end (10, 11) of the mainspring when it is inserted into the housing (21, 21 '); the method comprising: introducing the end (10, 11) of the mainspring into the housing (21); mechanically holding the end (10, 11) of the mainspring in the housing (21, 21 '); injecting a fluid (27) into the housing (21,21 '), the fluid being able to solidify when it dries and / or cools; and solidifying the fluid to fix the end (10, 11) of the motor spring in the fastening means (20, 40).
    [2]
    2. The method of claim 1, wherein the fastening means comprises a plug (20) mounted on the shaft (3) of the barrel and for fixing an inner end (10) of the mainspring; and wherein the inner end (10) is inserted into the housing (21).
    [3]
    3. The method according to claim 1 or 2, wherein the bung comprises a central ring (25) mounted on the shaft (3) and a peripheral ring (22) arranged concentrically around the shaft (3) in such a way that the housing (21) is between the peripheral ring (22) and the central ring (25); clamping the inner end (10) of the motor spring is ensured by central ring rotation (25) relative to the peripheral ring (22).
    [4]
    4. The method of claim 3, wherein the injection of the fluid (27) is performed after the central ring rotation (25) relative to the peripheral ring (22).
    [5]
    5. The method of claim 3 or 4, wherein the peripheral ring (22) has an opening (24), the inner end (10) of the mainspring being introduced into the housing (21) through the opening (24). ).
    [6]
    6. The method according to one of claims 3 to 5, wherein the central ring (25) takes the form of a snail cam.
    [7]
    7. The method according to one of claims 3 to 6, wherein the peripheral ring (22) comprises a projection (26).
    [8]
    8. The method according to one of claims 1 to 7, wherein the inner end (10) of the mainspring is introduced before the injection of the fluid.
    [9]
    9. The method according to one of claims 1 to 8, wherein a cover (23) is mounted on the peripheral ring (22) and the central ring (25), the cover (23) being configured to close the housing (21); the injection of the fluid being made through an orifice (28) formed in the cover (23).
    [10]
    The method of claim 9, wherein after the fluid injection, the lid (23) is removed or left in place on the peripheral ring (22).
    [11]
    11. The method according to one of claims 3 to 10, comprising the steps of: mounting the shaft (3) in a hub (32) provided in the bottom (31) of a setting; and mount the peripheral ring (22) and the central ring (25) concentric with the shaft (3).
    [12]
    The method of claim 11, further comprising the step of disassembling the bung-spring assembly assembly and mounted in a barrel drum.
    [13]
    13. The method according to one of claims 1 to 12, wherein the fixing means comprise a flange (40) mounted on the drum drum and for fixing an outer end (11) of the mainspring.
    [14]
    14. The method of claim 13, wherein the flange (40) comprises two clamping lamellae (41) delimiting the housing (21) into which is introduced the outer end (11) of the mainspring.
    [15]
    15. The method according to claim 14, wherein the outer end (11) is held by mechanical clamping by the spring action of the two clamping blades (41) when it is inserted into the housing (21 '). .
    [16]
    16. The method according to one of claims 1 to 15, wherein the fluid is a resin, a polymer or a metal.
    [17]
    17. The method according to one of claims 1 to 16, wherein the injection of the fluid (27) is carried out using a device of the plastic injection press type.
    [18]
    18. The method according to one of claims 1 to 17, wherein the mainspring (1) is made of a composite material.
    类似技术:
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    同族专利:
    公开号 | 公开日
    CH711698B1|2020-09-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CH15142015|2015-10-19|
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