• 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 drive device for watch movement, in particular for integration into a pendulum, the device comprising a drive means (1) able to pick up energy from a modification of an ambient parameter, a prestressing element (7) exerting a prestressing force on said drive means (1), and an output movable (3) kinematically connected to said driving means (1) and to a source of energy of said watch movement so as to transmit at least a portion of the energy captured by the drive means (1) to the energy source of said watch movement. The device is distinguished by the fact that the drive means comprises at least one shape memory alloy wire (1), a first end (1.1) of each shape memory alloy wire (1) being fixed, while a second end (1.2) of each shape memory alloy wire (1) is displaceably mounted, moving the second end (1.2) of said shape memory alloy wires (1) to drive in rotation said output mobile (3) to charge the energy source of said watch movement. The present invention also relates to a watch movement, respectively a timepiece, mechanical or electronic comprising such a device.
    公开号:CH712360A1
    申请号:CH00487/16
    申请日:2016-04-14
    公开日:2017-10-31
    发明作者:Rougny Laurent；Danielou Maxime
    申请人:Richemont Int Sa；
    IPC主号:
    专利说明:

    Field of the Invention [0001] The subject of the present invention is a drive device for a watch movement, in particular for integration into a pendulum, the device comprising a drive means capable of picking up energy from a modification of an ambient parameter, a prestressing element exerting a prestressing force on said drive means, and an output movable kinematically connected to said drive means as well as a source of energy of said watch movement so to be able to transmit at least a portion of the energy captured by the drive means to the energy source of said watch movement.
    In general, the invention relates to timepieces whose energy source does not need to be reloaded manually by the user, particularly in the case of a timepiece having a mechanical movement, even to be replaced, in the case of a timepiece having an electronic movement. Indeed, the majority of timepieces equipped with a mechanical movement, respectively electronic, is provided with a spring to be reassembled by the user, respectively a stack that needs to be replaced once emptied. This causes obvious disadvantages. Thus, the manual winding of the spring of a mechanical movement of a timepiece has the disadvantage that it must be performed periodically, otherwise the timepiece stops and must then be reset. The replacement of a battery causes the purchase of a new battery, possibly the intervention of an after-sales service, and also a time reset and / or a complete re-adjustment of the timepiece . State of the Prior Art [0003] In addition, for these reasons, there are approaches that attempt to eliminate the need to reload manually or to replace the energy source of a timepiece. Those skilled in the art are familiar with so-called automatic mechanical movements that use an oscillating mass that automatically recharges the spring serving as a source of movement energy. This only works however in the case of wristwatches and only when the watch is worn by the user. This solution, however, does not allow to continue to supply energy to the energy source such as a spring some time after the watch has been detached from the arm of the user, since it is in this case at rest so that the oscillating weight can no longer lift the spring. In addition, this solution is in any case not applicable to other types of timepieces, such as a clock or a table clock, which are not likely to perform movements capable of driving a mass oscillating.
    For this kind of timepieces, it is known to use a material whose phase changes between liquid and gaseous depending on the ambient temperature, such as in the pendulum ATMOS proposed by the applicant. In this case, a capsule filled with gas highly sensitive to temperature changes makes it possible, thanks to the pressure changes exerted by said material following the changes in the ambient temperature, to raise the spring of the corresponding mechanical movement. This solution makes it possible to operate a timepiece such as a pendulum under normal ambient conditions without the need to manually recharge or replace the energy source. However, it requires a sufficiently tight and stable capsule to house the gas and thus causes a certain complexity and a consequent space for the corresponding mechanism.
    Document US Pat. No. 6,804,171 discloses, moreover, for the reasons given, a mechanism for a timepiece for converting thermal energy into mechanical energy by using a material whose phase changes between solid and liquid in depending on the ambient temperature. The document also proposes, like other publications on this subject, to use an electricity generator to transform the mechanical energy into electrical energy in order to recharge an electric accumulator and thus use the mechanism also in rooms of watchmakers equipped with an electronic movement. This solution, on the one hand, only partially eliminates the need for a relatively complex capsule construction, since it is still necessary to have a capsule housing a material changing phase between solid and liquid , instead of a material changing phase between liquid and gas as in the ATMOS pendulum mentioned above. On the other hand, the overall complexity as well as the bulk of this mechanism do not seem inferior to those of said ATMOS pendulum.
    [0006] JP 2005/345 214 discloses an automatic winding mechanism of a conventional barrel spring using a specific material, such as nylon, which expands and contracts as moisture changes and which is arranged either spiral or son. Like the mechanism used in the ATMOS pendulum or that according to document US Pat. No. 6,804,171, this system then replaces an oscillating mass. The use of the change in the humidity rate inside the box of a timepiece is however not practical and, in particular, is not compatible with a timepiece waterproof.
    [0007] JP 10 288 679 discloses a helical spring made of a shape memory alloy, one end of which is fixed to the inner wall of the case of a watch, while the other end is fixed on a rotary shaft. in the center of the watch. According to this document, the coil spring can thus serve as a heat engine for electronic watches when the thermal conduction from the human body produces a change in shape of said spring, which in turn produces a torque for driving an electric generator in order to charge an accumulator which provides the energy necessary for the operation of the watch. It is not known to the applicant whether products actually exploiting this principle have already been made.
    In this context, it can be seen that, despite the fact that several solutions of the prior art exist to achieve an automatic winding system of a mainspring, or even an automatic charging system of an electric accumulator, these solutions are not completely satisfactory. Indeed, if the conventional automatic movements are not usable for all the cases of figure, the additional contribution that the other proposed systems could offer is often thwarted in particular with the level of the complexity and the congestion of these systems as well as as regards the resulting manufacturing price.
    OBJECTIVES OF THE INVENTION [0009] The object of the present invention is thus to remedy, at least partially, the disadvantages of the known systems and to provide a training device for a watch movement which has a simple and robust structure, in addition to guarantee a reasonable production cost, as well as a reliable operation, and which can be integrated both in a mechanical watch movement and in an electronic movement. Moreover, the device should lend itself, preferably, for integration into a pendulum.
    Solution According to the Invention [0010] For this purpose, the present invention proposes a drive device of the aforementioned type which is distinguished by the characteristics set forth in claim 1. In particular, in the device according to the present invention the means of drive comprises at least one shape memory alloy wire, a first end of each shape memory alloy wire being secured, while a second end of each shape memory alloy wire is movably mounted, the moving the second end of said shape memory alloy wires to rotate said output mobile in order to charge the energy source of said watch movement.
    By these measures, the device allows to drive automatically, using the shape of shape memory alloy wire changes as a result of changes in ambient temperature, the energy source of a watch movement. The automatic drive is possible without further measures in the case of a conventional barrel spring of a mechanical watch movement, but the device can also be used, in combination with an electricity generator and an electric accumulator, for a movement electronic.
    Preferably, the automatic drive device according to the present invention comprises at least one return pulley for extending the active length of each shape memory alloy wire. This makes it possible to increase the heat exchange surface of each shape memory alloy wire as well as the total length of the wires included in the device.
    Furthermore, the invention also relates to a watch movement, whether mechanical or electronic, as well as a timepiece, preferably a pendulum, comprising such an automatic drive device. In general, the latter is adapted to be used in several horological applications, so that it can be used flexibly.
    Other features, as well as the corresponding advantages, will become apparent from the dependent claims, as well as from the description which sets forth the invention in more detail.
    Brief Description of the Drawings [0015] The accompanying drawings show schematically and by way of example an embodiment of the invention.
    Fig. 1 shows an exploded view of an embodiment of an automatic drive device according to the present invention for a watch movement, in particular for integration in a pendulum, the parts of the watch movement, respectively of a timepiece; in which the device should be integrated, not being illustrated.
    Fig. 2 shows a top view of the driving device of FIG. 1 in the assembled state, some parts of the device being shown transparently and the top portion of the frame not shown to simplify understanding.
    Fig. 3 shows a perspective view from above of a driving device of FIG. 2 equipped with a shape memory alloy wire, the top part of the frame and the prestressing element not being illustrated to simplify understanding.
    Fig. 4 shows a perspective view from above of a driving device of FIG. 2 equipped with a plurality of shape memory alloy wires, some parts of the device being shown transparently and the top portion of the frame and the prestressing element are likewise not illustrated to simplify understanding.
    DETAILED DESCRIPTION OF THE INVENTION [0016] The invention will now be described in detail with reference to the accompanying drawings illustrating by way of example an embodiment of the invention.
    The present invention relates to a drive device intended to be integrated in a watch movement, preferably in a mechanical movement, and more particularly in a pendulum equipped with such a movement. However, it is also possible to integrate a drive device according to the present invention in an electronic movement, respectively in a corresponding timepiece. For reasons of simplification of the language used, we will speak indifferently later of "watch movement" and "timepiece", without wanting to limit the scope of the corresponding explanations which extend in any case to any type movement, respectively of timepieces, having a movement either mechanical or electrical. If the drive device according to the present invention will subsequently be described, by way of example, in the context of a pendulum equipped with a mechanical movement, this does not limit the scope of protection for this invention because a integration with other types of timepieces is feasible by analogy. In addition, such a driving device can be integrated into a watch movement in the form of a module. Since the components of a movement, respectively the other parts of a timepiece which are adapted to be combined with the driving device according to the invention, on the one hand, are in themselves known to the Those skilled in the art and, on the other hand, do not form the object of the present invention, the following description will be limited mainly and as far as possible to the structure and operation of said drive device.
    In order to first comment on the structure and components of an automatic drive device according to the present invention, reference is made to FIGS. 1 and 2 which illustrate schematically and by way of example a preferred embodiment of such a device in the context of its integration in a mechanical movement, respectively in a pendulum equipped with such a movement.
    As is apparent from FIGS. 1 and 2 which show an explosion view, respectively a top view of a drive device according to the present invention, this device comprises, preferably arranged between a lower plate 5.1 and an upper plate 5.2 parallel to the lower plate 5.1 , drive means 1 adapted to pick up energy from a modification of an ambient parameter, a prestressing element 7 exerting a prestressing force on said drive means 1, and an output mobile 3 kinematically connected to said driving means 1 as well as to a power source of said watch movement, so as to be able to transmit at least a portion of the energy picked up by the driving means 1 to the energy source of said movement watchmaker. The energy source of said watch movement, such as a conventional barrel spring, as well as the other parts of the movement are not illustrated in the figures because known to those skilled in the art.
    According to the present invention, the drive means comprises at least one shape memory alloy wire 1, a first end 1.1 is fixed, for example to a first fixing pin 5.3 mounted between the plates 5.1, 5.2 while a second end 1.2 of each shape memory alloy wire 1 is movably mounted. Preferably, said second end 1.2 of each shape memory alloy wire 1 is mounted so as to be able to perform a rotary movement, but it can also perform a translational movement. In the embodiment illustrated in the figures, the second end 1.2 of each shape memory alloy wire 1 is mounted on a securing member 6, for example by means of a second securing pin 6.1 attached close to the circumference of said securing member 6. The securing member 6 may comprise a plurality of holes distributed over its circumference at an equal angular distance and capable of receiving said second securing pin 6.1, in order to allow the best choice and / or modification to be made and at the simplest location of the second securing pin 6.1, respectively the second end 1.2 of each shape memory alloy wire 1 on the securing member 6, depending on the length of said shape memory alloy wire 1. The fixing device 6 is mounted, in the embodiment of the device illustrated in the figures, so as to be free to rotate about an axis of rotation 2.1 whose ends are mounted in lower bearings 5.1.1 and higher 5.2.1 arranged on the bottom plates 5.1 and higher 5.2. Regardless of the embodiment chosen for the displacement of the second end 1.2 of said shape memory alloy wires 1, this displacement should make it possible to rotate said output mobile 3 in order to charge the energy source of said movement. watchmaker.
    For this purpose and as mentioned above, the mobile output 3 is kinematically linked to said drive means 1. In a particularly simple and advantageous manner, this kinematic connection between the output mobile 3 and the means of 1 can be carried out by a rake 2.2 fixed on the axis of rotation 2.1 of the mobile attachment 6, as illustrated in FIGS. 1 and 2. A toothing of this rake 2.2, for example in the form of partial circular arc toothing, meshes directly with the output mobile 3. The latter in turn serves to transmit the torque to a source of energy of said movement. watchmaker, so as to be able to transmit at least a portion of the energy captured by the drive means 1 to the energy source of said watch movement. For example, the output mobile 3 illustrated in FIGS. 1 and 2 can be directly kinematically connected to a barrel ratchet so as to load a conventional barrel spring with a mechanical movement. These parts of the movement as well as their connection to the output mobile 3 are not illustrated in FIGS. 1 and 2, as well known to those skilled in the art. In the embodiment of the device illustrated in the figures, the rake 2.2 fixed on the axis of rotation 2.1 is further equipped with a balancing counterweight 2.3 whose main function is to balance the weight distribution of the formed part. by the assembly rake 2.2 and balancing counterweight 2.3. Alternatively, it is possible to provide an indirect gear train and more complex between the mobile output 3 and the mobile attachment 6 on which the second end 1.2 of the drive means 1 is fixed, that is to say to provide a gear train between the mobile attachment 6 and the mobile output 3, especially in the case where a high multiplication ratio between these mobiles is desired. In the example illustrated in the figures, this multiplication ratio is in a range from 10 to 30, preferably between 15 and 20, but by providing a gear as mentioned above it can be chosen relatively freely according to needs.
    Furthermore, the prestressing element 7 which comprises a drive device according to the present invention and which exerts a prestressing force on said drive means 1 is, in the embodiment of the device illustrated in FIGS. . 1 and 2, also made in a particularly simple and advantageous manner by placing a prestressing mass 7 around the axis of rotation 3.1 of the output mobile 3. In particular, in the case of the embodiment of the illustrated device to the figures and intended to be integrated in a pendulum, the prestressing mass 7 can simply be fixed on the periphery of a prestressing pulley 3.2 mounted on said axis of rotation 3.1 of the output mobile 3 and be bent downwards to the The use of a chain or a rope, so that the prestressing force is exerted by the gravitational force, is respectively caused by the gravitational acceleration g applying to its weight. The angular displacement of this prestressing mass 7 and the rake 2.2 can be limited by providing a slot in the form of a partial circle arc, in which a limiting pin 5.4 is mounted projecting fixed between the lower plates 5.1 and upper 5.2, on the balancing counterweight 2.3. It is obviously possible to place this prestressing mass 7 on another axis and to provide a kinematic connection by gearing with the securing device 6, in analogy to what has been said above with respect to the positioning of the rake 2.2. Another alternative consists in producing said prestressing element 7 by a preloading spring, one end of which acts either directly or indirectly on the securing device 6, respectively generally on the second end 1.2 of each shape memory alloy wire 1 In all cases, the prestressing element 7 makes it possible to exert a prestressing force on said shape memory alloy wires 1 so as to keep them always under tension. Thus, a displacement of the second end 1.2 of each shape memory alloy wire 1 causes, via the fixing mobile 6 and the rake 2.2, in rotation said mobile output 3 in order to charge the power source said watch movement. In one embodiment of the device not shown in the figures, the prestressing element could also be made in the form of a mass 7 fixed on the axis of rotation 2.1 and being integral with the rake 2.2 and the counterweight of balancing 2.3 so as to serve, advantageously, simultaneously kinematic link between the drive means 1 and the mobile output 3, then allowing to directly load the energy source of the watch movement equipped with such a device, without need for an extra gear.
    As regards more particularly the drive means produced by at least one shape memory alloy wire 1 of the automatic drive device according to the present invention, the diameter of these shape memory alloy wires 1 is normally in a range from 0.1 mm to 4 mm, preferably from 0.5 mm to 1.5 mm. Furthermore, the automatic driving device according to the present invention preferably comprises a plurality of shape memory alloy wires 1. The number of shape memory alloy wires 1 is selected as a function of the diameter of the alloy wire. shape memory 1 and is normally in a range from 1 to 45. Preferably, the number of shape memory alloy wires 1 is between 1 and 15, particularly preferably between 7 and 12. For example, fig. 3 shows, in a perspective view, such a device equipped with a shape memory alloy wire 1, while FIG. 4 shows, in a perspective view, a device equipped with ten son of shape memory alloy 1. In fact, by increasing the number of shape memory alloy wire 1, it is possible to adjust the torque generated at the level of FIG. the mobile fixing 6, depending on the multiplication ratio chosen between the mobile attachment 6 and the mobile output 3 as well as torque requirements at the energy source of the watch movement. In general, it is preferable to use a larger number of small-to-medium diameter shape memory alloy wires 1 than to use a small number of large-diameter shape memory alloy wires 1. .
    [0024] The shape memory alloy wires 1 used in a device according to the present invention are generally stretched elements which may have a section of any shape, such as circular or rectangular. They may for example be made of nickel-titanium alloy, cuprous alloy, or any other material with two-way memory effect assisted, that is to say able to resume, following an elastic deformation because of a change of temperature and under stress, entirely its initial form. In principle, shape memory materials are known to those skilled in the art and do not form, per se, the object of the present invention which targets the use of these materials in a particular form and in a specific constellation in the field. context of an automatic drive device for watch movement. For this reason, the following description will not repeat in detail the foundations and characteristics of these materials. It is briefly recalled that these materials can be brought through temperature changes to change between austenite phase and a martensite phase by internal reorientation, which results in a change in the external shape of the material. In particular, in the case of a wire made of a shape-memory material and put under tension by a prestressing means, the wire contracts and expands as a function of the variations of the ambient temperature, namely the wire contracts. because of a growth of the austenite following an increase of the temperature and the wire expands because of a growth of the martensite following a decrease of the temperature. Thus, the shape memory alloy wires 1 used in a device according to the present invention as a driving means enable cyclic capture of energy from a modification of an ambient parameter, namely temperature. It is preferable to use shape memory alloy wires 1 which have a low or very low hysteresis, that is to say a material whose contraction and expansion hysteresis curves are only distant from a few ° C, ideally less than 0.5 ° C to 4 ° C. This makes it possible to obtain a low thermal inertia of the drive means, that is to say, to guarantee the operation of the device also in the presence of only slight variations in temperature. In addition, it is preferable to choose a material whose hysteresis curve is centered at a temperature of about 20 ° C to 25 ° C, so that the optimum operating range of the shape memory alloy wires 1 best coincides with the ambient temperatures at which a timepiece in which the device is integrated is generally exposed.
    As visible in particular in FIGS. 1, 2, and 4, the device preferably comprises at least one return pulley 4, part of the circumference of which serves to lengthen the active length of each shape memory alloy wire 1. This makes it possible to increase the heat exchange surface of each shape memory alloy wire 1 as well as the total length of said shape memory alloy wires 1 included in the device. In the embodiment of the device illustrated in the figures, the latter comprises three return pulleys 4 whose rotational axes 4.1 are arranged between the lower plate 5.1 and the upper plate 5.2. In a particularly favorable manner with regard to the use of the available space, the three return pulleys 4 can be placed in such a way that their axes of rotation 4.1 form a triangle, one of the axes of rotation can simultaneously form the above-mentioned limitation pin 5.4 of the counterweight 2.3. It is obvious to those skilled in the art that the return pulleys 4 and the shape memory alloy wires 1 can be positioned differently without this having a substantial influence on the structure or operation of the device. Thus, each shape memory alloy wire 1 is preferably arranged in the meandering automatic driving device, which makes it possible to give the shape memory alloy wires 1 an active length as a function of the needs in terms of the torque required at the mobile attachment 6, or even at the mobile output 3.
    In the embodiment of the device illustrated in the figures, the active length of the shape memory alloy wire 1 is in a range from 100 mm to 1000 mm, preferably between 400 mm and 600 mm. The order of magnitude of deformation in length of each shape memory alloy wire 1 is in a range from 0.5% to 8%, preferably from 2% to 3%. By way of example, this therefore produces, during the contraction and expansion of a shape memory alloy wire 1 with a length of 500 mm, a variation of its length from approximately 10 mm to 15 mm. This variation in length corresponds, while still speaking of the embodiment of the device illustrated in the figures, to an angular distance traveled by the securing member 6 during a cycle of contraction and expansion of a memory alloy wire. of form 1 of about 40 ° to 50 °, respectively at an angular distance traveled by the mobile output 3, taking into account the multiplication ratio mentioned above, from about 400 ° to 1500 °, preferably between 600 ° and 1000 °. When a plurality of shape memory alloy wires 1 are provided, as illustrated in FIG. 4, they are arranged in parallel on said return pulleys 4. In this way, the son can have an identical active length, so that during a contraction and expansion cycle the variation in length is almost identical to a shape memory alloy wire 1 to another and that the angular distance traveled by the mobile attachment 6, respectively by the mobile output 3 is independent of the number of son used. On the other hand, it is the torque produced at the level of the securing device 6, respectively of the output device 3, which varies as a function of the number of shape memory alloy wires 1 used. Preferably, the torque created at the barrel of a mechanical movement is in a range from 200 gr mm to 3000 gr mm, but this torque can be easily adjusted to a determined value by modifying the diameter and / or the material shape memory alloy wires 1, their active length, their number, and / or the multiplication ratio between the fixing mobile 6 and the output mobile 3.
    The above explanations concerning the structure and components of an automatic driving device according to the present invention make it easy to understand its operation. Indeed, when the ambient temperature varies, the shape memory alloy wires 1 contract and expand in a cyclic manner. Since the prestressing means 7 keep the shape-memory alloy wires 1 still energized, the latter cyclically rotate the securing device 6 which drives the output mobile 3 via the rake 2.2. output 3 can then directly raise the barrel spring of a mechanical movement or charge the battery of an electronic movement. In the latter case, the mobile attachment 6 first supplies mechanical energy to an electricity generator which then supplies electrical energy to an accumulator of said electronic movement. Electricity generators and accumulators are commercially available and do not form the subject of the present invention, so that these elements will not be described in more detail in the following description.
    The present invention therefore also relates to a watch movement which comprises at least one automatic drive device as described above. If it is a mechanical movement, said drive device makes it possible to automatically and directly raise a mainspring of said movement. If it is an electronic movement, said drive device can automatically load a battery of said movement through an electricity generator supplied with mechanical energy by the drive device.
    Finally, the present invention also relates to a timepiece which comprises either a driving device or a watch movement as described above. Preferably, it is a pendulum, in particular a pendulum comprising a mechanical movement whose barrel spring is raised via said automatic drive device. It can nevertheless be any other type of timepiece, in addition to an electronic timepiece.
    权利要求:
    Claims (15)
    [1]
    Given the arrangement and operation of the device described above, it is understood that an automatic drive device according to the present invention can capture energy from a modification of an ambient parameter and transmitting at least a portion of the energy captured by the drive means constituted by at least one shape memory alloy wire to the energy source of a watch movement. The latter thus becomes energetically autonomous and no longer requires intervention in this regard from the user, either by manually raising a mainspring or by replacing a battery, which makes the use of the timepiece correspondingly much more suitable. At the same time, the automatic drive device has a simple and robust structure, safe and reliable operation, as well as a reasonable production cost. These advantages are obtained while ensuring that the drive device according to the present invention can be used for several applications and therefore has a certain flexibility. In particular, this automatic drive device can advantageously be integrated into timepieces equipped with a mechanical movement or, by providing an electricity generator and an accumulator supplied with electrical energy by said generator, in parts of watchmakers equipped with an electronic movement. In general, the device can be integrated into any type of watch movement, respectively of timepieces, preferably in a mechanical pendulum. claims
    1. Drive device for clock movement, the device comprising a drive means (1) adapted to capture energy from a modification of an ambient parameter, a prestressing element (7) exerting a force preloading means on said drive means (1), and an output movable (3) kinematically connected to said drive means (1) as well as to a power source of said watch movement so as to be able to transmit at least one part of the energy captured by the drive means (1) at the power source of said watch movement, characterized in that the drive means comprises at least one shape memory alloy wire (1), a first end (1.1) of each shape memory alloy wire (1) being fixed, while a second end (1.2) of each shape memory alloy wire (1) is displaceably mounted, the displacement from the second end me (1.2) of said shape memory alloy wires (1) for rotating said output mobile (3) in order to charge the energy source of said watch movement.
    [2]
    Drive device according to the preceding claim, characterized in that the drive device comprises a plurality of shape memory alloy wires (1), the number of shape memory alloy wires (1) being in a range from 2 to 15, preferably 7 to 12, depending on the diameter of the shape memory alloy wires (1).
    [3]
    Drive device according to one of the preceding claims, characterized in that the diameter of the shape memory alloy wires (1) is in a range from 0.1 mm to 4 mm, preferably between 0.5 mm and 1.5 mm.
    [4]
    Drive device according to one of the preceding claims, characterized in that the shape-memory alloy wires (1) consist of a nickel-titanium alloy, a cuprous alloy or any other material with a memory effect. two-way form assisted.
    [5]
    Drive device according to one of the preceding claims, characterized in that the shape memory alloy wires (1) have an active length in the range of 100 mm to 1000 mm, preferably 400 mm. mm and 600 mm.
    [6]
    6. Drive device according to one of the preceding claims, characterized in that the shape memory alloy wires (1) have a low hysteresis.
    [7]
    7. Drive device according to one of the preceding claims, characterized in that the device comprises at least one return pulley (4), a portion of the circumference is used to lengthen the active length of each memory alloy wire of shape (1), so as to increase the heat exchange surface of each shape memory alloy wire (1) as well as the total length of said shape memory alloy wires (1) included in the device.
    [8]
    8. Drive device according to the preceding claim, characterized in that the shape memory alloy wires (1) are arranged in parallel on said return pulleys (4).
    [9]
    Drive device according to one of the preceding claims, characterized in that the prestressing element (7) is formed either by a prestressing mass or by a prestressing spring.
    [10]
    10. Drive device according to one of the preceding claims, characterized in that the prestressing element is formed by a preload mass (7) which is fixed on the periphery of a prestressing pulley (3.2) mounted on the axis of rotation (3.1) of the output mobile (3) and whose prestressing force is caused by the gravitational acceleration (g) applying to its weight.
    [11]
    11. Watch movement, especially for integration in a pendulum, characterized in that it comprises at least one drive device according to one of the preceding claims 1 to 10.
    [12]
    12. Watch movement according to the preceding claim, characterized in that it is a mechanical movement, said drive device for automatically raising a barrel spring of said movement.
    [13]
    13. Watch movement according to the preceding claim 11, characterized in that it is an electronic movement, said drive device for automatically loading an accumulator of said movement via a generator d electricity supplied with mechanical energy by the drive device.
    [14]
    14. Timepiece, characterized in that it comprises a drive device according to one of claims 1 to 10 or a watch movement according to one of the preceding claims 11 to 13.
    [15]
    15. Timepiece according to the preceding claim, characterized in that it is a pendulum, preferably a pendulum comprising a mechanical movement.
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    同族专利:
    公开号 | 公开日
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPS60201214A|1984-03-27|1985-10-11|Yokogawa Hokushin Electric Corp|Driving device|
    US20080271470A1|2007-05-01|2008-11-06|Robertshaw Controls Company|Memory Wire Rotary Actuator|
    WO2013084057A1|2011-12-08|2013-06-13|Preciflex Sa|Low volume precision bellows|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CH00487/16A|CH712360B1|2016-04-14|2016-04-14|Drive device comprising shape memory alloy wires for a watch movement.|CH00487/16A| CH712360B1|2016-04-14|2016-04-14|Drive device comprising shape memory alloy wires for a watch movement.|
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