• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:
    The invention relates to a balance spring balance in which the moment of inertia balance can be modified without generating asymmetry in weight. The balance-spring comprises a balance shaft (4), and a rocker arranged around the balance shaft (4), in which there is provided a first serge (6) constituting the balance and having a guide portion configured for vary, at the distance from the balance shaft (4) in accordance with a peripheral direction around the balance shaft (4), an elastic portion (30) arranged to slide along the guide portion and capable of elastic deformation in the radial direction about the balance shaft, and a second serge (18) having a plurality of weight portions (28) arranged in the circumferential direction so as to adjust the moment of inertia of the balance wheel without generating asymmetry in weight.
    公开号:CH709052B1
    申请号:CH02049/14
    申请日:2014-12-29
    公开日:2019-09-30
    发明作者:Kawauchiya Takuma；Niwa Takashi；Nakajima Masahiro
    申请人:Seiko Instr Inc；
    IPC主号:
    专利说明:

    Description
    Background of the invention
    1. Field of the invention The present invention relates to a balance spring mounted in a timepiece, a movement including the balance spring and a timepiece.
    2. Description of the Prior Art [0002] As a mechanism for adjusting the movement of a mechanical timepiece, there is known a balance spring without racket (see, for example, American patent No. 7,661,875 (first patent document)). The balance spring without racket is a mechanism that modulates the moment of inertia of the balance spring in order to vary its oscillation cycle, thereby adjusting the delay and the advance of the timepiece. The oscillation cycle of the balance spring can be expressed by equation (1).
    Equation (1) [0003] When the moment of inertia of the balance spring is greater than that expressed by equation (1), the cycle of oscillation of the balance spring is long; and when the moment of inertia of the balance spring is smaller than that expressed by equation (1), the cycle of oscillation of the balance spring is short. As a method of modulating the moment of inertia, a weight is generally used; by moving the weight in the radial direction, we modify the moment of inertia. In this conventional technique, the positions of a plurality of screwed weights are adjusted separately, so that if the amount of movement of each weight differs even slightly, the center of gravity of the balance spring is deviated from the 'axis of rotation, and there is a risk that the oscillation cycle of the balance spring when it is flat is out of adjustment.
    In addition, a mechanism is known in which the positions of the weights are moved along the arms also serving as a guide for adjusting in this way the moment of inertia (see, for example, US Patent No. 2,880,570 (second patent document)). The weight positions are adjusted by a weight position adjusting element; by turning this component relative to the balance shaft, it is possible to advantageously move, by a certain amount, the weights located opposite the rotational axis.
    In the conventional technique, however, there must be, from the manufacturing point of view, a space between the weight and the guide rail and between the weight and the weight position adjusting element; and, due to this space, there is the possibility that the positions of the opposing weights may be deviated. When the positions of the opposing weights are deviated, the center of gravity of the balance-spring is distant from the axis of rotation, and an asymmetry is created in the weight, in which the position of the center of gravity is located single side, so that it is feared that the oscillation cycle of the balance-spring when it is flat is out of adjustment.
    Summary of the invention [0007] An object of the present patent application is to propose a balance-spring, a movement, and a timepiece with which the moment of inertia of the balance wheel can be adjusted without generating weight asymmetry.
    According to the present patent application, there is provided a balance spring comprising a balance shaft, and a balance wheel arranged around the balance shaft, in which the balance wheel comprises a first serge and a second serge. The first twill is rotatable around the pendulum shaft and has a guide portion configured so that its distance from the pendulum shaft varies when moving in a peripheral direction around the pendulum shaft. The second serge comprises, on the one hand, an elastic part connected to an arm fixed relative to the balance shaft, arranged to slide along the guide part and capable of elastic deformation in the radial direction around the balance shaft, and secondly, a plurality of weights attached to the elastic portion and distributed in the peripheral direction so as to allow the moment of inertia of the balance wheel to be adjusted without generating asymmetry in the weights .
    Because of this characteristic, it is possible to adjust the moment of inertia of the balance wheel while effectively removing the space between the first serge and the second serge having the flyweights, so that it is possible to remove the asymmetry in the weight of the balance wheel.
    In addition, according to the present patent application, there is provided a balance spring, in which the second serge has a contact part configured to be in contact with the first serge by the elastic deformation of the elastic part; and the contact part is adjacent to one of the weights.
    CH 709 052 B1 Due to this characteristic, the elastic part of the second serge only comes into contact with the contact part, by which it is easier to control the parts brought into contact with each other. , making it possible to precisely adjust the distance between the flyweights and the balance shaft.
    In addition, according to the present patent application, there is provided a balance spring, in which the guide part has an inclined surface which is inclined so that the distance from the balance shaft varies uniformly along the peripheral direction around the pendulum shaft.
    Due to this characteristic, when adjusting the distance between the flyweights and the balance shaft, it is possible to adjust the distance to a uniform ratio, so that it is possible to guarantee reliably a desired moment of inertia.
    In addition, according to the present patent application, there is provided a balance-spring, in which the second serge has an engagement part configured to be engaged with the first serge by elastic deformation of the elastic part; and the engagement portion is engaged with the first twill, whereby the sliding motion of the second twill along the guide portion is defined.
    Because of this characteristic, the first serge and the second serge are reliably engaged with each other thanks to the engagement part, so that it is possible, in particular, to remove a relative deviation of the first serge and the second serge in the axial direction of the balance shaft. Therefore, it is possible to adjust the moment of inertia of the balance shaft in a more stable way.
    In addition, according to the present patent application, there is provided a balance spring, in which the first twill has a slot having a width smaller than the diameter of the balance shaft, which passes through this slot.
    Due to this characteristic, compensation for the first serge and the balance shaft is eliminated due to the resilience of the slot, so that it is possible to precisely adjust the distance of the guide part from the pendulum shaft.
    In addition, according to the present patent application, there is provided a balance spring, in which the first serge comprises a support part at a fixed distance from the balance shaft when one moves in the peripheral direction around the pendulum shaft; the guide part being formed between two ends which are on the first serge and which are a first end at a first distance from the pendulum shaft and a second end at a second distance from the pendulum shaft which is smaller that the first distance; and the elastic part having the shape of an arc shorter than the arc between the first end and the second end on the support part.
    Because of this characteristic, even when the adjustment is made so that the distance between the weights and the balance shaft is large, the amount of projection from the guide portion is suppressed, making it possible to suppress the increase in the outer diameter of the balance wheel as much as possible. Therefore, it is possible to increase the margin of freedom by arranging the balance-spring in the timepiece.
    In addition, according to the present patent application, there is provided a balance spring, in which the guide portion is formed on the outer peripheral surface of the first serge.
    Due to this characteristic, it is possible to adjust the moment of inertia of the balance wheel in a more stable manner.
    In addition, according to the present patent application, there is provided a balance spring, in which the guide portion is formed on the inner peripheral surface of the first serge.
    Due to this characteristic, it is possible to remove a relative deviation of the first serge and the second serge due to a centrifugal force or the like, making it possible to adjust the moment of inertia of the balance wheel. in a more stable way.
    In addition, according to the present patent application, there is provided a balance spring, in which the guide part comprises an auxiliary guide part retaining the elastic part from the external peripheral side.
    Due to this characteristic, a relative deviation of the first serge and the second serge is further eliminated, and it is possible to adjust the moment of inertia of the balance wheel in a more stable manner.
    In addition, according to this patent application, there is provided a balance spring, comprising a twill formed of a bimetal.
    Due to this characteristic, it is possible to provide a balance spring the oscillation cycle of which is not easily changed even if the temperature changes.
    In addition, according to the present patent application, there is provided a balance spring, comprising a device for adjusting the relative angular position usable for pivoting the first serge and the second serge with respect to each other. and to thereby adjust the angular position of the first serge and the second serge relative to each other.
    Due to this feature, it is possible to adjust the angular position of the first serge and the second serge relative to one another easily and precisely.
    CH 709 052 B1 [0030] In addition, according to the present patent application, a timepiece movement is proposed, comprising an escapement mechanism / regulator including the aforementioned balance-spring, and a gear train.
    In addition, according to the present patent application, there is proposed a timepiece which includes the above-mentioned movement, and an external element having a dial.
    Due to this characteristic, it is possible to provide a timepiece, the movement of which is properly protected.
    Brief description of the drawings
    [0033]Fig. 1 is a structural diagram illustrating a timepiece according to a first embodiment of the present invention. Fig. 2 is a structural diagram illustrating a movement to be inserted into the timepiece according to the first embodiment of the present invention. Fig. 3A is a perspective view of a balance spring on which a spiral spring according to the first embodiment of the present invention is mounted. Fig. 3B is a perspective view of a balance spring from which the spiral spring according to the first embodiment of the present invention has been removed. Fig. 4 is an exploded view of the balance spring according to the first embodiment of the present invention. Fig. 5A is a plan view of the balance spring according to the first embodiment of the present invention when its moment of inertia is set to an average value. Fig. 5B is a sectional view taken along line AA of FIG. 5A. Fig. 6A is a plan view of the balance spring according to the first embodiment of the present invention when its moment of inertia is set to a minimum value. Fig. 6B is a plan view of the balance spring according to the first embodiment of the present invention when its moment of inertia is set to a maximum value. Fig. 7A is a plan view of the balance spring according to a second embodiment of the present invention when its moment of inertia is set to an average value. Fig. 7B is a sectional view taken along line AA of FIG. 7A. Fig. 8A is a plan view of the balance spring according to a third embodiment of the present invention when its moment of inertia is set to an average value. Fig. 8B is a sectional view taken along line AA of FIG. 8A. Fig. 9A is a plan view of the balance spring according to a fourth embodiment of the present invention when its moment of inertia is set to an average value. Fig. 9B is a sectional view taken along line AA of FIG. 9A. Fig. 10A is a plan view of the balance spring according to a fifth embodiment of the present invention when its moment of inertia is set to an average value. Figs. 10B, 10C and 10D are plan views illustrating how the angular position of a first serge is adjusted relative to a second serge.
    Detailed description of the preferred embodiments The first embodiment according to the present invention will be described with reference to FIGS. 1 to 6.
    First, a timepiece and a movement will be described schematically with reference to FIGS. 1 and 2. Fig. 1 is a structural view illustrating the timepiece, and FIG. 2 is a structural view illustrating the movement to be inserted in the timepiece.
    A movement 500 to be mounted in a mechanical timepiece (timepiece) 1000 has a mainspring installed in its barrel drum. The energy accumulated in the mainspring is transmitted from the barrel
    CH 709 052 B1 movement to a center mobile, a third mobile, and a second mobile before being transmitted to an escapement mobile. This 700 cog transmission is transmitted to an exhaust / regulator mechanism. The escapement mobile and an anchor mainly function as an escapement mechanism, and a balance-spring 1 performs speed regulation.
    Now, the balance spring inserted in the movement will be described with reference to FIG. 3. Fig. 3A is a perspective view of the balance spring 1 on which a balance spring 2 is mounted, and FIG. 3B is a perspective view of the balance spring 1 without the balance spring 2.
    The balance spring 1 has a balance shaft 4 rotatably supported relative to a main plate and a movement support plate called bridge, via a bearing including a hole stone and a stone against pivot. A balance wheel 6 is mounted integrally with the balance shaft 4, 18 by means of the arms 8 and 20 called "arms".
    The balance wheel can be molded in one piece with the arms or can be integrally formed by means of an interlocking or the like. The balance wheel 6, 18 can rotate around the axis of the balance shaft 4. The balance wheel has a second clamp 18 fixed to the balance shaft 4 by the second arm 20, and a first clamp 6 turning in relation to the second serge 18.
    The first serge 6 is formed integrally with the first arm 8. At its central part, the first arm 8 has a slot 10 narrower than the diameter of the balance shaft 4; this slot 10 is slightly widened to be engaged with the balance shaft 4, so that the balance shaft 4 and the first serge 6 are supported so that they can rotate relative to each other due to the resilience of the slot 10. In addition, to prevent detachment of the first serge 6 from the balance shaft 4, the balance shaft 4 has a first rim portion 5. [0041] The first serge 6 is formed with an annular configuration in the form of a closed arc, and is composed of a support part 12 having a circumference of an external diameter at the same distance as measured from the balance shaft 4, and a guide part 14 with an external diameter which is not the same distance as that measured from the balance shaft. The guide portion 14 is inclined so that its outer diameter, that is to say, its distance from the balance shaft 4, changes uniformly along the circumferential direction. This inclined surface 16 has the function of guiding the second serge 18 described below. The inclined surface 16 is provided on the external peripheral side of the first serge 6. As it extends from a first end 34 towards a second end 36 in the circumference of the first serge 6, the inclined surface 16 is such as its distance from the pendulum shaft 4 increases.
    In addition, due to the resilience of the slot 10, the first serge 6 is engaged by insertion into the balance shaft 4, so that the compensation of the first serge 6 and the balance shaft 4 is deleted, so that the distance of the two guide parts 14 of the balance shaft 4 can easily be kept equal. Therefore, the distance from the balance shaft of the second serge 18 described below which is guided by the guide portions 14 is also uniform, and the position of the center of gravity of the balance spring is always kept close to the rotational axis of the balance shaft 4. Therefore, it is possible to remove the disturbance affecting the precision due to the asymmetry in the weight (the imbalance in the center of gravity during rotation).
    To eliminate the generation of asymmetry in the weight level of the balance spring 1, it is desirable that the first serge 6 is formed with the correct configuration. So, the first serge 6 is machined by a high-precision shape machining technique, such as UV-LIGA (Ultraviolet Lithography Galvanoformung Abformung) or DRIE (Deep Reactive Ion Etching) or MIM (Metal Injection Molding). In addition, the first twill 6 is formed from a material suitable for the above machining methods, for example a metal such as nickel, or a material with a crystalline orientation such as monocrystalline silicon.
    Here, when adjusting the moment of inertia, the inclined surface 16 slides on the second serge 18. Therefore, it is desirable that the first serge 6 be made of a material of great hardness. Nickel and silicon have a high hardness, and are suitable as a material for the first serge 6.
    The second serge 18 is connected to the balance shaft 4 by the second arm 20. A through hole 22 is provided at the central part of the second arm 20; the balance shaft 4 is inserted into this through hole 22, so that the second arm 20 and the balance shaft 4 are fixed to each other. Here, the second serge 18 has an arcuate shape, and has a stationary end 24 fixed to the second arm 20, and a free end 26 formed opposite the stationary end 24 viewed in the peripheral direction. The free end 26 is not fixed to the second arm 20, so that it can be moved by an inertial force, an external force or the like. A plurality of weights 28 are mounted at the free end 26. By arbitrarily adjusting the volume, weight, position, etc. weights 28, it is possible to adjust the moment of inertia of the balance-spring 1. Here, an elastic part 30 is formed between the stationary end 24 and the free end 26 of the second serge 18. In addition, the elastic part 30 has an engagement part 32 engaged with the guide part 14 of the first serge 6. The engagement part 32 serves to improve the proximity in contact between the elastic part 30 of the second serge 18 and the guide part 14 of the first serge 6. In the present embodiment, the engagement part 32 projects from the second serge 18, towards the first serge 6, and adjoins the end surface in the axial direction of the balance shaft 4 of the first serge 6, so
    CH 709 052 B1 that it is possible to prevent a positional offset between the first serge 6 and the second serge 18 in the axial direction of the balance shaft.
    The elastic part 30 is formed of a material capable of elastic deformation. Examples of materials include iron, stainless steel, carbon steel, brass, resin, nickel alloy, invar and phosphor bronze. Before assembly, the elastic part 30 (which is in the state of natural length) is adjusted to a curvature greater than the curvature of the first annular serge 6. Due to this difference in curvature, the second serge 18 can be in close contact with the first serge 6, without the presence of any space.
    A hole 29 is provided between the first row 6 and the second row. In this context, there is provided, at the free end 26, a contact part 26a projecting precisely towards the first serge. Due to the hole 29 and the contact part 26a, only the contact part 26a of the elastic part 30 is in contact with the first serge 6. Since the contact part 26a is in contact with the first serge 6 only at one single point, the contact position is precisely defined, so that the distances between the two free ends 26 and the balance shaft 4 can easily be kept equal. In other words, the distances between the counterweights 28 and the balance shaft 4 can easily be kept equal, which makes it possible to prevent asymmetry in weight being generated. In addition, due to the hole 29, the parts of the elastic part 30 other than the contact part 26a are not allowed to come into contact with the first twill 6. Therefore, it is possible to avoid the situation in which the the free end 26 cannot be brought into close contact with the first serge because of the parts of the elastic part 30 other than the contact part 26a coming into contact with the first serge 6.
    Now, the order in which the balance spring is assembled will be described with reference to FIG. 4. Fig. 4 is an exploded view of the balance spring 1.
    The balance shaft 4 is inserted into a through hole 22 in the center of the second serge 18; it is inserted until the second arm 20 of the second serge 18 adjoins a second edge portion 38 extending in the radial direction of the balance shaft 4. The internal diameter of the through hole 22 is formed so smaller than the outer diameter of the insertion part of the balance shaft 4 by, for example, 1/100 mm; due to this difference in diameter, the second serge 18 can be fixed so as to be able to rotate relatively by forcing the balance shaft 4.
    Then, the balance shaft 4 is inserted into the slot 10 in the center of the first serge 6, and the first serge 6 is fitted with the balance shaft 4. In the center of the first serge 6, it is provided the slot 10 of a width smaller than the width of the balance shaft 4; this slot 10 is slightly extended to allow the insertion of the balance shaft 4, so that the first serge 6 is maintained to be able to rotate relatively due to the resilience. At this time, the first serge 6 is also kept in contact with the engagement part 32 of the second serge 18.
    By the above methods, the balance shaft 4 and the first serge 6 are supported so as to be able to rotate relatively, and the second serge 18 is fixed to the balance shaft 4 of so you can't turn.
    After this, a weight 28 is mounted near each free end 26 of the second serge 18. Here, the first serge 6 is held between the weights 28 and the second serge 18. Due to this arrangement, it is possible to prevent relative movement, in the axial direction of the balance shaft, between the guide part 14 of the first row 6 and the free ends 26 of the second row 18.
    Now, a method of adjusting the moment of inertia of the balance spring will be described with reference to Figs. 5 and 6. Fig. 5A is a plan view of the balance spring when its moment of inertia is set to an average value; fig. 6A is a plan view of the balance spring when its moment of inertia is set to a minimum value; and fig. 6B is a plan view of the balance spring when its moment of inertia is set to a maximum value. Fig. 5B is a sectional view taken along the line AA of FIG. 5A.
    When adjusting the moment of inertia of the balance spring 1, the first clamp 6 is rotated relative to the balance shaft 4 and the second clamp 18, and the inclined surface 16 of the part of guide 14 is caused to slide relative to the flyweights 28 of the second serge 18. Due to the sliding of the inclined surface 16, the distance between the flyweights 28 and the balance shaft 4 is changed. Therefore, it is possible to adjust the moment of inertia of the balance-spring 1.
    The elastic part 30 in contact with the inclined surface 16 is capable of elastic deformation to come into close contact with the first serge 6, so that the common position between the first serge 6 and the second serge 18 can be easily fixed .
    Here, for example, when setting the moment of inertia to a low value, the first end 34 of each inclined surface 16 is adjusted to be close to the counterweight 28 as shown in FIG. 6A. On the other hand, when adjusting the moment of inertia to a large value, the second end 36 of each inclined surface 16 is adjusted to be close to the counterweight 28 as shown in FIG. 6B.
    CH 709 052 B1 In the state shown in FIG. 6A, in which the moment of inertia is set to be low, the elastic part 30 is arranged between the first end 34 of the guide part 14 and the second end 36 of the adjacent guide part 14. Consequently, the quantity projection from the guide portion is removed, making it possible to remove as much as possible the outer diameter of the balance wheel. In addition, the external diameter is eliminated, with the moment of inertia being set low, so that even in the state of FIG. 6B, in which the moment of inertia is set significantly, the amount of projection from the guide portion is suppressed, making it possible to suppress the outer diameter of the balance wheel as much as possible. Therefore, the margin of freedom when arranging the balance spring in the timepiece is increased.
    Now, the second embodiment of the present invention will be described with reference to FIG. 7. Fig. 7A is a plan view of the balance spring when its moment of inertia is set to an average value, and FIG. 7B is a sectional view taken along line AA of FIG. 7A. The components which are the same as those of the first embodiment are indicated by the same reference numbers, and their description will be left aside.
    The present embodiment differs from the first embodiment in that the elastic part before assembly (in the natural state of length) is adjusted to a smaller curvature than that of the first twill, and in that that the inclined surface of the guide portion is provided on the inner peripheral side of the first serge.
    In the present embodiment, an inclined surface 116 is formed on the internal peripheral surface of the first serge 6. The free end of the elastic part 30 of the second serge 18 striving to be restored in the direction of external diameter is suppressed by the internal peripheral surface of the first annular serge 6, so that even when the balance-spring turns, the possibility that the second serge 18 separates from the first serge 6 due to a force such that the centrifugal force exerted on the counterweights 28 is always lower.
    In addition, by arranging the weights on the internal side of the first annular serge, there is no part projecting from the balance wheel, thus making it possible to remove the external diameter of the balance wheel for to be small. Therefore, the margin of freedom when arranging the balance spring in the timepiece is increased. In addition, since there is no part projecting from the balance wheel, it is possible to reduce the energy loss due to the viscous friction resistance of the air.
    Next, the third embodiment of the present invention will be described with reference to FIG. 8. Fig. 8A is a plan view of the balance spring when its moment of inertia is set to an average value, and FIG. 8B is a sectional view taken along line AA of FIG. 8A. The components which are the same as those of the first embodiment are indicated by the same reference numbers, and their description will be left aside.
    The present embodiment differs from the first embodiment in that the elastic part before assembly (which is in the natural state of length) is adjusted to a smaller curvature than that of the first annular twill, and in that the guide part of the first serge guides the elastic part of the second serge from two sides.
    In the present embodiment, the first serge 6 also has an auxiliary guide part 214 formed integrally and continuously with the guide part 14 on the internal peripheral side. In addition, each counterweight 28 has a projection 29. The projection 29 is formed so that its end projects from the free end 26 by being forced into the free end 26. The auxiliary guide portion 214 comes into contact with each projection 29 from the external peripheral side, so that the second serge 18 is not separated on the external peripheral side. Therefore, even when the balance spring turns, the possibility that the second serge 18 will separate from the first serge 6 due to a force, such as the centrifugal force acting on the flyweights 28, is always less. In addition, even if the elastic part 30 and the flyweights 28 are diverted radially inwards due to an external shock such as a fall, each projection 29 comes into contact with the guide part 14 to prevent this. . Therefore, the possibility that the second serge 18 will separate from the first serge 6 is always less.
    In the above embodiment, the second serge constituting the balance wheel is mounted very close to the first serge due to the elastic part, so that it is possible to prevent the radial position of the flyweight of the second serge becomes damaged in agreement with the peripheral direction. So, it is possible to provide a balance-spring adjusted in the moment of inertia while removing asymmetry in weight.
    Now, the fourth embodiment of the present invention will be described with reference to FIG. 9. Fig. 9A is a plan view of the balance spring when its moment of inertia is set to an average value, and FIG. 9B is a sectional view taken along line AA of FIG. 9A. The components which are the same as those of the second embodiment are indicated by the same reference numbers, and their description will be left aside.
    The present embodiment is a modification of the second embodiment; it differs from the second embodiment in that a bimetal twill 46, which is a twill formed from a bimetal, and a temperature correction amount adjusting screw 41 are arranged radially on the outer side of the first serge 6.
    In this embodiment, the second arm 20 extends radially on the outer side of the stationary end 24 of the second serge 18, and a stationary end 40 of the bimetal serge 46 is fixed to the end of the second extension arm 20. The bimetal twill 46 is cut into two cut parts 44, and its part
    CH 709 052 B1 on the side opposite the peripherally stationary end 40 is formed as a free end 45 which is not connected to the second arm. A hole 47 is provided between the bi-metal serge 46 and the first serge 6, and the bi-metal serge 46 and the first serge are retained so as not to come into contact with each other. The bimetal twill 46 is composed of an internal twill 42 formed of a relatively low thermal expansion coefficient material, and an external twill 43 formed of a relatively high thermal expansion coefficient material, the internal twill 42 and the outer serge 43 being connected by solder or the like. Examples of material combinations for internal serge 42 and external serge 43 include brass and steel, brass and invar, and stainless steel and invar. The bimetallic twill is provided with screw holes arranged at fixed circumferential intervals, a temperature correction quantity adjustment screw 41 being mounted at each screw hole. The number of screw holes is greater than the number of temperature correction amount adjustment screws; in fig. 9A, screw holes (not shown) are provided between the temperature correction amount adjustment screws 41a, 41b, 41c and 41 d, making it possible to arbitrarily change the mounting positions of the temperature adjustment screws. amount of temperature correction.
    Now, the effects of the bimetal twill 46 and the temperature correction amount adjustment screws 41 will be described. In the case where a Young's modulus material which varies linearly with respect to the temperature change, like iron, is used for the balance spring of the balance spring, the Young's modulus of the spiral spring is lowered when the temperature of the spiral spring increases due, for example, to an increase in temperature, so that the oscillation cycle increases, and the timepiece slows down. To compensate for this loss, the bi-metal serge changes the moment of inertia of the balance spring with a change in temperature. In the case, for example, where the temperature increases, when the moment of inertia of the balance-spring is reduced, the oscillation cycle decreases, and the timepiece accelerates. In other words, the bimetal twill 46 and the temperature correction quantity adjustment screws 41 compensate for the change in the oscillation cycle generated in the spiral spring by a change in the moment of inertia of the balance- spiral.
    The coefficient of thermal expansion of the outer arm 43 of the bi-metal serge 46 is greater than that of its internal serge 42; therefore, when, for example, the temperature increases, the curvature of the bimetal serge 46 increases due to this difference. The stationary end 40 of the bi-metal serge 46 is fixed to the second arm 20, so that, when the curvature of the bi-metal serge 46 increases, the closer the free end 45, the closer the pendulum shaft 4. When the mass of the bi-metal serge 46 and the temperature correction quantity adjustment screws 41 mounted on the bi-metal serge 46 approximate that of the balance shaft 4, the moment of inertia is reduced , and the oscillation cycle is shortened. To adjust the degree of change in the oscillation cycle, the positions of the temperature correction amount adjusting screws 41 are changed. In other words, when a large number of temperature correction amount adjustment screws are mounted at positions close to the free end 45, the amount by which the oscillation cycle is changed is greater; and when a large number of temperature correction amount adjustment screws are mounted at positions close to the stationary end 40, the amount by which the oscillation cycle is changed is smaller. To prevent imbalance in the center of gravity, the temperature correction quantity adjustment screws 41 are always mounted in pairs at positions which are opposite each other with the balance shaft 4 between them. Therefore, when changing the mounting positions of the temperature correction amount adjusting screws 41, it is necessary to simultaneously move the coupled temperature correction amount adjusting screws 41. The mounting positions of the adjusting screws of the temperature correction amount are adjusted so that the amount by which the oscillation cycle changes due to the change in the Young's modulus of the spiral spring 2 is close to change the amount in the oscillation cycle due to a change in the moment of inertia of the bi-metal serge 46, so that it is possible to provide a higher precision balance-spring which is not subject to a change in the oscillation cycle if the temperature around the balance-spring changes.
    Therefore, according to the present embodiment, it is possible to provide a balance spring of higher precision which, in addition to the effects of the above embodiments, is not subject to a change in the cycle d oscillation if the temperature changes. Furthermore, instead of being a modification of the second embodiment, the present embodiment can be a modification of the first embodiment and the third embodiment.
    In addition, instead of being provided radially on the outer side of the second twill, the bimetal twill of this embodiment can be provided on the inner side.
    In addition, the combination of materials of the bimetal twill of this embodiment may be a combination of materials other than those mentioned in this embodiment as long as they are materials with coefficients of thermal expansion. different.
    Now, the fifth embodiment of the present invention will be described with reference to FIG. 10. Fig. 10A is a plan view of the balance spring when its moment of inertia is set to an average value, and FIGS. 10B, 10C and 10D are plan views illustrating how the angular position of the first row 6 is adjusted relative to the second row 18. The components which are the same as those of the first embodiment are indicated by the same numbers. reference, and their description will be left out.
    The present embodiment differs from the first embodiment in that a relative angular position adjustment groove 51 is provided in the internal periphery of the first serge 6, that a scale 52 is provided in the
    CH 709 052 B1 external periphery of the first row 6, and that a relative angular position adjustment hole 50 is provided at the stationary end 24 of the second row 18.
    In the present embodiment, among a support part 12 and a guide part 14 in the internal periphery of the first serge 6, the support part 12 is provided with the groove for adjusting the relative angular position 51 to every ten degrees. In addition, on the outer peripheral side of the part of the first serge where the position adjustment grooves 51 are provided, there is provided the scale 52, which is graduated at each degree. In addition, the relative angular position adjustment hole 50 is provided at the stationary end 24 of the second serge.
    Now, the method for adjusting the relative angular position will be described. A template 60 is provided with a first projection 61 and a second projection 62. The diameter of the first projection 61 is smaller than that of the relative angular position adjustment hole 50, and the diameter of the second projection 62 is smaller that the diameter of an arc-shaped bottom part 51a of each relative angular position adjustment groove 51. In FIG. 10A, when the first serge 6 must be turned clockwise, the first projection 61 of the template 60 is engaged with the relative angular position adjustment hole 50, and the second projection 62 is engaged with the one of the relative angular position adjustment grooves 51 before turning the template 60 anti-clockwise in the direction Y1, as shown in FIG. 10B. Then, the template 60 rotates around the first projection 61, and the second projection presses the side surface of the relative angular position adjustment groove 51, so that the first serge 6 is rotated clockwise shows, and the state of fig. 10D is reached by passing through the state of FIG. 10C. In the state of fig. 10D, the template 60 can also not rotate anti-clockwise, so that the template 60 is removed once from the balance spring 1, and the template 60 is engaged again to reach the state of engagement of fig. 10B to repeat the same operation. The scale 52 is provided in the outer periphery of the first serge 6, so that, for example, by counting the number of scale graduations having passed the stationary end 24, it is possible to easily grasp how much has been changed the angular position of the first serge. In addition, when the quantity whose oscillation cycle is changed by a rotational angle of the first row 6 is counted previously, it is possible to know, for example, the number of scale graduations by which the first row 6 must be rotated counterclockwise when the ratio of the timepiece is to gain ten seconds.
    In addition, while in the present embodiment the relative angular position adjustment grooves are provided in the first row, and the relative angular position adjustment hole is provided in the second row, it is also possible to provide the relative angular position adjustment grooves in the second row and the relative angular position adjustment hole in the first row.
    In this embodiment, there is provided a relative angular position adjustment device for adjusting the angular position of the first serge and the second serge with respect to each other. In the present embodiment described above, it is possible to adjust the angular position of the first serge 6 relative to the second serge 18 in an easy and correct manner, so that it is possible to provide a higher precision balance spring.
    The present invention is not limited to the above embodiments but allows different modifications.
    It is also possible to combine different embodiments with one another; for example, it is possible to apply the guide portion of the third embodiment to the second embodiment.
    In addition, instead of being of a cantilever type structure having a stationary end and a free end, the elastic part may be a beam type structure bearing double ends having ends motionless at both ends of the arc. In this case also, it is possible to provide the same effect as that of the above embodiments if the curvature of the elastic part is different from that of the first twill.
    claims
    权利要求:
    Claims (13)
    [1]
    1. Balance spring (1), comprising a balance shaft (4) and a balance wheel (6) arranged around the balance shaft (4), in which the balance wheel (6) comprises:
    a first serge (6) rotatable around the balance shaft (4) and having a guide portion (14) configured so that its distance from the balance shaft (4) varies when one moves in a peripheral direction around the balance shaft (4), and a second serge (18) comprising, on the one hand, an elastic part (30) connected to an arm (20) fixed relative to the balance shaft (4) , arranged to slide along the guide portion (14) and capable of elastic deformation in the radial direction around the balance shaft (4), and on the other hand, a plurality of weights (28) attached to the elastic portion (30) and distributed in the peripheral direction so as to allow the moment of inertia of the balance wheel to be adjusted without generating asymmetry in the weight.
    [2]
    2. balance-spring (1) according to claim 1, wherein the second serge (18) has a contact part configured to be in contact with the first serge (6) by the elastic deformation of the elastic part (30); and
    CH 709 052 B1 the contact part is attached to the weights (28).
    [3]
    3. balance spring (1) according to claim 1 or 2, wherein the guide portion (14) has an inclined surface (16; 116) which is inclined so that the distance from the balance shaft (4) varies uniformly along the peripheral direction around the balance shaft (4).
    [4]
    4. balance-spring (1) according to one of claims 1 to 3, wherein the second serge (18) has an engagement part (32) configured to be engaged with the first serge (6) by an elastic deformation of the elastic part (30); and the engagement portion (32) is engaged with the first twill (6), whereby the sliding movement of the second twill (18) along the guide portion (14) is defined.
    [5]
    5. balance-spring (1) according to one of claims 1 to 4, in which the first serge (6) has a slot (10) having a width smaller than the diameter of the balance shaft (4), which passes through this slot (10).
    [6]
    6. balance-spring (1) according to one of claims 1 to 5, wherein the first serge (6) has a support portion (12) at a fixed distance from the balance shaft (4) when one is moves in the peripheral direction around the balance shaft (4);
    the guide part (14) being formed between two ends which are on the first serge (6) and which are a first end (34) at a first distance from the balance shaft (4) and a second end (36 ) at a second distance from the balance shaft (4) which is smaller than the first distance; and the elastic part (30) having the shape of an arc shorter than the arc between the first end (34) and the second end (36) on the support part (12).
    [7]
    7. balance spring (1) according to one of claims 1 to 6, wherein the guide portion (14) is formed on the outer peripheral surface of the first serge (6).
    [8]
    8. balance spring (1) according to one of claims 1 to 6, wherein the guide portion (14) is formed on the inner peripheral surface of the first serge (6).
    [9]
    9. Balance spring (1) according to one of claims 1 to 8, in which the guide part (14) comprises an auxiliary guide part (214) retaining the elastic part (30) from the external peripheral side.
    [10]
    10. balance-spring (1) according to one of claims 1 to 9, comprising a twill formed of a bimetal.
    [11]
    11. balance-spring (1) according to one of claims 1 to 10, comprising a device for adjusting the relative angular position (50, 51, 52) usable to rotate the first serge (6) and the second serge (18 ) one relative to the other and to thereby adjust the angular position of the first serge (6) and the second serge (18) relative to each other around the balance shaft (4 ).
    [12]
    12. Movement (500), comprising an escapement mechanism / regulator including a balance spring (1) according to one of claims 1 to 11, and a gear train (700).
    [13]
    13. Timepiece (1000), comprising a movement (500) according to claim 12, as well as an external element having a dial.
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    同族专利:
    公开号 | 公开日
    JP2015143673A|2015-08-06|
    US20150185700A1|2015-07-02|
    CN104749933B|2018-05-15|
    US9128465B2|2015-09-08|
    CN104749933A|2015-07-01|
    CH709052A2|2015-06-30|
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    法律状态:
    2021-07-30| PL| Patent ceased|
    优先权:
    申请号 | 申请日 | 专利标题
    JP2013273239|2013-12-27|
    JP2014197238A|JP2015143673A|2013-12-27|2014-09-26|Balance with hairspring, movement, and timepiece|
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