• 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 invention relates to a display device (1) for a timepiece, comprising: a display member (3); a drive system of the display member (3) arranged to be driven by a clockwork movement (13) and to lead the display member (3) in motion; the drive system comprising at least a first (7) and a second pulley (9), and at least one wire (5) passing around the first pulley (7) and the second pulley (9), said wire (5) ) forming part of a closed driveline. According to the invention, the wire (5) is attached to at least one of said pulleys (7, 9), and in that said closed kinematic chain comprises at least one spring element (15).
    公开号:CH710542A1
    申请号:CH01992/14
    申请日:2014-12-19
    公开日:2016-06-30
    发明作者:Rognon Nicolas；Parent Frédéric
    申请人:Christophe Claret Eng Sa；
    IPC主号:
    专利说明:

    Technical area
    The present invention relates to the field of watchmaking. More particularly, it relates to a display device in which the drive system of the indicator member comprises at least one wire.
    State of the art
    [0002] Several kinds of wire drive display devices are already known. For example, mention may be made of the X-TREM-1 watch, marketed by the applicant, in which magnets, acting as indicating members, are retrogradely driven along transparent tubes by means of a wire. . This wire extends between a first pulley integral in rotation with a wheel controlled by the movement and a second so-called tension pulley which is connected to a frame member by means of a spiral spring, the spring thus serving to tension the wire. . The first pulley is driven itself by means of a rake controlled by a cam driven by the basic movement.
    The same wire drive principle was used in the Vertigo Sport, marketed by Pierre Kunz, as well as in the timepiece described in US 2,333,832 and US 2,292,458.
    These arrangements have the disadvantage that, during the course of the display member from its starting position to its final position, the spiral spring that includes the tensioning pulley tends, and therefore provides more and more of resistance to the drive system.
    [0005] Therefore, the basic movement must provide more and more torque to overcome this resistance. These torque variations generated during the display cycle can adversely affect the isochronism of the basic motion control member if additional measures are not taken.
    [0006] Display devices as described in DE 1 444 797 U are exempt from this disadvantage. These displays include a looped band, which extends around two pulleys. Nevertheless, a real retrograde display is not possible with such an arrangement, which has two indexes, needles or the like which run one after the other along a scale, the band always rotating in the same direction of rotation . On the other hand, if, after a period of wear, the band becomes loose, an adjustment of the latter will be necessary, and the stability of the accuracy of the indication provided is not guaranteed. A solution to this specific problem has been proposed in DE 9015366 U1, in which conventional tension rollers serve to tension the web. Nevertheless, the length of the band is thus modified by the tensioning rollers, which affects the accuracy of the display.
    The object of the invention is therefore to provide a display device for a timepiece in which the aforementioned defects are at least partially overcome.
    Disclosure of the invention
    More specifically, the invention relates to a display device for a timepiece, comprising a display member, and a drive system of the display member arranged to be driven by a movement. watchmaking and to carry the display member on the move. The drive system comprises at least one wire passing around at least one first pulley and around a second pulley, said wire forming part of a closed kinematic chain.
    According to the invention, the wire is attached to at least one of said pulleys, the closed kinematic chain comprises at least one spring element in the chain.
    Therefore, the display member can be accurately positioned, without sliding of the wire on a pulley, and the spring element in the kinematic chain compensates for any variations in length in the system due to wear, changes in temperature, or the nature of the display member. In addition, the spring member makes it possible to maintain the resistance that the display device exhibits with respect to the base movement that is as constant as possible during its operating cycle, which may be of the retrograde type.
    Advantageously, the closed kinematic chain is formed by the assembly of said wire and the spring element, the ends of the wire being connected by said spring element to form a closed loop passing around at least two pulleys. A very simple display device is thus proposed, in which the aforementioned advantages are present.
    [0012] Advantageously, the closed kinematic chain comprises a tensioning wheel. This tensioner can be a double pulley, that is to say two coaxial pulleys, in which the two pulleys are connected to each other by means of said spring element. Therefore, the tension of the yarn is obtained without requiring a conventional tensioning roller, which deflects the yarn in order to make up any play and apply tension on the yarn. The proposed solution keeps a single path for the wire.
    Alternatively, the tensioner can comprise two toothed wheels connected to each other by means of said spring element. The tensioner can thus be located at a distance from the pulleys.
    Advantageously, said wire is attached at each of its ends to a pulley. Advantageously, it is attached at its respective ends, to said first pulley and to said second pulley, said first pulley forming part of a first double pulley also comprising a first additional pulley, said second pulley forming part of a second double pulley. also comprising a second additional pulley, a second wire being attached at its respective ends to said first additional pulley and said second additional pulley.
    This second double pulley can constitute said mobile tensioner.
    [0016] Advantageously, the display member is a pivotally mounted needle, said wire being attached to the needle.
    Advantageously, said wire consists of two half-wires each attached either to the display member or to a member driving the display member (for example to a magnet which is magnetically coupled to the body display). Such an arrangement has more flexibility in terms of design and facilitates mounting relative to a unitary wire.
    Brief description of the drawings
    Other details of the invention will appear more clearly on reading the description which follows, given with reference to the accompanying drawing in which:<tb> -The fig. 1 <SEP> is a schematic view of a first variant of a display device applying the principle of the invention;<tb> fig. 2 <SEP> is a schematic view of a second variant of a display device applying the principle of the invention;<tb> figs. 3 and 4 <SEP> are perspective views of a third variant of a display device applying the principle of the invention; and<tb> fig. <SEP> is a sectional view of a double pulley of the third variant.
    Embodiment of the invention
    FIG. 1 schematically illustrates a first variant of a display device 1 according to the invention. The display device 1 can be controlled to indicate any value, for example the seconds, minutes or hours of the current time, the date, the day of the week, the power reserve of the watch, the state of a watch function, or any other information.
    The display device 1 of FIG. 1 comprises an element 3 integral with at least one wire 5. The element 3 secured to the wire may be either a display member as such, or may alternatively be, as is the case in the X-watch TREM-1 mentioned above, a magnet which drives the visible display member by magnetic coupling. In the following, the element 3 will be referenced as a display member to improve the readability of the text. Furthermore, it should be noted that the display member may be attached to a single wire, or the wire 5 may be divided at the display member 3, the two half-wires being each attached to the wire. display member.
    The wire may be made of a metal such as steel, a polymer such as aramid, dacron, dyneema, carbon fibers, or any other suitable material. Ideally, the Young's modulus of the material constituting the yarn is greater than 50 GPa, ideally greater than 100 GPa. It goes without saying that the definition of a wire does not mean that its cross section is necessarily circular, and also includes square, rectangular, ovoid, etc., and ribbons and strips having a ratio height / appropriate width, etc.
    The wire 5 forms a closed loop around two pulleys, including a first pulley 7 and a second pulley 9, and is attached to the first pulley 7 X. This attachment can be made by means of a weld point , glue, a screw, a pin, passing the wire 5 through a hole and attaching it to the inside of the pulley, or by any other suitable means.
    The pulley 7 is the driving pulley, and is integral in rotation with a toothed wheel 11 which is intended to serve as a power take-off from a base movement 13, shown schematically. The base movement 13 can be both mechanical and electromechanical. The second pulley 9 is the driven pulley, which rotates thanks to the friction between the wire 5 and its surface. The base movement 13 may incorporate a retrograde drive mechanism of any kind in order to drive the display member 3 in a retrograde manner.
    The two ends of the wire 5 are connected to each other by means of an elastic member 15, to form a loop with the wire 5, and thus constitute a closed kinematic chain.
    The elastic member 15 is for example a spring, or a wire, a strip or the like of elastomeric material, and serves to put the wire 5 under tension. To do this, the elastic element has an elasticity greater than that of the wire 5. It therefore allows the use of a wire 5 much stiffer than is usual in such an arrangement. In fact, normally, in the absence of a tensioning pulley, a wire with a high elasticity is provided in order to provide tension and to make up for any elongations of the wire, band, etc. generated by wear, which affects the accuracy of the display.
    In combination, the use of an elastic element 15 in the loop of the wire 5, and therefore as part of the closed kinematic chain, in combination with the connection between the wire 5 and the first pulley 7 , makes it possible to position the display member 3 very precisely. Indeed, the attachment between the wire 5 and the first pulley 7 serves as a fixed reference point between the display member 3 and the first driving pulley 7, and the elastic member allows to use a wire that has little elasticity, such as steel. In addition, any possibility of sliding between the first driving pulley 7 and the wire 5 is eliminated.
    Moreover, the load imposed by the display device on the base movement 13 remains constant and is therefore independent of the position of the display member 3 along its path.
    Fig. 2 schematically illustrates a second variant of a display device applying the principle of the invention.
    In this variant, the wire 5 is not looped, and wraps one of the pulleys on the other, according to the direction of movement of the indicator member 3, which is attached to the wire 5 To do this, both ends of the wire 5 are attached to the two pulleys 7, 9 respectively. In the illustrated example, each end is introduced through an opening in the inside of its pulley and is attached by means of a stopper which serves to secure the end with a corresponding stop provided on the pulley. Each pulley 7, 9 is integral in rotation with a respective toothed wheel 11a, 11b, which can be integral with the respective pulley 7, 9. These toothed wheels are each kinematically connected with a resiliently connected wheel 19, via an intermediate wheel 17a, 17b respectively. The kinematic chain is thus closed, and the elastic linkage mobile 13 acts as a mobile tensioner.
    The elastic linkage 19 comprises, distributed on two levels, a first gear 19a, kinematically connected to the first pulley 7 via the intermediate wheel 17a, and a second gear 19b, in kinematic connection with the second pulley 9 via the intermediate wheel 17b. The first gear wheel 19a is connected to the second gear wheel via a spiral spring 15, one end (the inner end or the outer end) is integral with the first gear wheel 19a, and the other end is integral with the second gear 19b. Therefore, by preloading the spiral spring 15 when mounting the mechanism, a preset voltage is applied to the wire 5.
    The base movement 13 applies a torque to the first wheel 19a of the elastic linkage mobile 19, thus driving the first driving pulley 7. As is the case for the embodiment of FIG. 1, the position of the display member 3 along its path is thus precisely determined, and the tension of the thread 5 is kept constant by means of the elastic member 15. The load on the basic movement remains therefore constant and independent of the state of the display device.
    Figs. 3 and 4 further illustrate a variant of a display device 1 according to the invention. In this variant, the display member 3 is in the form of a needle pivoted about an axis 3a. The needle 3 is attached to the wire 5 at an intermediate point between its pivot axis 3a and its free end, to cause it to pivot. In the variant shown, the wire 5 consists of two half-wires 5a, 5b, attached to one another by means of a pin 21 integral with the needle 3. It goes without saying that the wire 5 can also be a single thread to which the needle is attached.
    Each half-wire 5a, 5b is guided by a respective guide pulley 23a, 23b and is attached at its end to the respective pulley 7, 9, for example as described for the embodiment of FIG. 2.
    The first pulley 7 is part of a first double pulley 29 composed of the first pulley 7 and a first additional pulley 27, integral in rotation with each other. These pulleys 7, 27 are also integral in rotation with a toothed wheel 11, and which is intended to serve as a PTO from a base movement 13, (in the same way as in the embodiment of FIG. The toothed wheel is mounted on the first additional pulley 27 in an adjustable manner so that the angular position of the needle 3 can be adjusted accurately.
    The second pulley 9 is also part of a second double pulley 31 composed of the second pulley 9 and a second additional pulley 25. On the other hand, these pulleys 9, 31 are not integral with each other. other, but are bonded by means of an elastic member 15, in the form of a spiral spring, the spiral spring being prestressed to provide tension in the threads 5a-c. Thus, the second double pulley 31 is therefore mobile tensioner.
    An additional wire 5c is attached to each of the first and second additional pulleys 27, 25 to close the kinematic chain. It goes without saying that the additional wire 5c and the additional pulleys 27, 25 are arranged in such a way that the additional wire 5c can wind / unwind on the two additional pulleys sufficiently to allow the angular displacement desired for the needle 3 .
    As it is clearly visible in FIG. 5, which illustrates the second double pulley 31 in section, the second pulley 9 is integral with a shaft 33 at a first end thereof. The other end of the shaft 33 is secured to the inner end of the spiral spring 15 by any known means, for example by interaction between polygonal shapes, by pinning, or the like.
    The second additional pulley 25 is mounted idle around the shaft 33, and the outer end of the spiral spring 15 is secured thereto by means of a stud 35. As is the case for the other variants, the Spiral spring 15 serves to provide tension for all yarns in the driveline. Furthermore, a disc 35 is provided on one side of the spiral spring 15.
    However, in this embodiment, the spiral spring 15 has an additional function. During the development of the needle 3 from one extreme position to the other, the total distance between the guide pulley 23a, the point of attachment 21 of the threads on the needle and the guide pulley 23b, evolves between a minimum when the needle is in one of its extreme positions, and a maximum midway of its course. The spiral spring 15 makes it possible to provide the necessary length of wire, since the relative angular position between the second pulley 9 and the second additional pulley 25 can vary in a necessary manner. In this case, the torque provided by the base movement 13 varies slightly depending on the position of the needle, because the spiral spring tends to bring the needle 3 to its nearest extreme position, and the torque supplied must therefore be overcome in order to move the needle to its halfway position.
    Although the invention is described in relation to particular embodiments, the latter are not to be considered as limiting the scope of the invention as defined by the claims.
    权利要求:
    Claims (10)
    [1]
    1. Display device (1) for a timepiece, comprising:- a display member (3);- A drive system of the display member (3) arranged to be driven by a clockwork movement (13) and to lead the display member (3) moving;the drive system comprising at least a first (5) and a second pulley (9), and at least one wire (5; 5a, 5b, 5c) passing around the first pulley (7) and the second pulley (9); ), said wire (5; 5a, 5b, 5c) forming part of a closed kinematic chain,characterized in that the wire (5; 5a, 5b, 5c) is attached to at least one of said pulleys (7, 9), and in that said closed kinematic chain comprises at least one spring element (15).
    [2]
    2. A display device (1) according to claim 1, wherein the closed kinematic chain is formed by the assembly of said wire (5; 5a, 5b, 5c) and the spring element (15), the ends of the wire (5; 5a, 5b, 5c) being connected by said spring member (15) to form a closed loop passing around at least two pulleys (7, 9).
    [3]
    3. Display device (1) according to claim 1, wherein the closed kinematic chain comprises a tensioning wheel (19; 31).
    [4]
    4. Display device (1) according to claim 3, wherein said tensioning mobile (31) is a double pulley (31) comprising two pulleys (9, 25) connected to each other by means of said spring element. (15).
    [5]
    5. Display device (1) according to claim 3, wherein said tensioning mobile (19) comprises two toothed wheels (19a, 19b) connected to each other by means of said spring element (15).
    [6]
    6. Display device (1) according to one of claims 3 to 5, wherein said wire (5; 5a, 5b, 5c) is attached at each of its ends to a pulley (7, 9).
    [7]
    A display device (1) according to claim 6, wherein said wire (5; 5a, 5b) is attached at each end to each of said first pulley (7) and said second pulley (9) respectively, said first pulley (7) forming part of a first double pulley (29) also comprising a first additional pulley (27), said second pulley (9) forming part of a second double pulley (31) also comprising a second additional pulley ( 25), a second wire (5c) being attached at each end to said first additional pulley (27) and said second additional pulley (25) respectively.
    [8]
    8. Display device (1) according to claim 6, wherein said second double pulley (31) constitutes said tensioning mobile.
    [9]
    9. Display device (1) according to one of the preceding claims, wherein the display member (3) is a pivotally mounted needle, said wire (5; 5a, 5b) being attached to the needle . (3)
    [10]
    10. Display device (1) according to one of the preceding claims, wherein said fi! (5) consists of two half-wires (5a, 5b) each attached either to the display member (3) or to a member driving the display member (3).
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    同族专利:
    公开号 | 公开日
    CH710542B1|2018-09-28|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2961230A|1955-05-25|1960-11-22|Borletti Spa|Apparatus for indicating speed on rectilinear scales in tachometers, particularly for self-propelled vehicles|
    DE2600296B1|1976-01-07|1977-04-21|W & N Appbau Gmbh|Digital clock display using number webs - has transported between to reels either side of display window|
    EP1884841A1|2006-08-01|2008-02-06|Agenhor SA|Timepiece movement allowing control of a display mechanism following a complex path and timepiece incorporating said movement|EP3620865A1|2018-09-05|2020-03-11|The Swatch Group Research and Development Ltd|Mechanical or electromechanical timepiece with mysterious drive mechanism|
    法律状态:
    2016-12-15| PFA| Name/firm changed|Owner name: CHRISTOPHE CLARET ENGINEERING SA, CH Free format text: FORMER OWNER: CHRISTOPHE CLARET ENGINEERING SA, CH |
    2019-06-14| NV| New agent|Representative=s name: BOVARD SA NEUCHATEL CONSEILS EN PROPRIETE INTE, CH |
    优先权:
    申请号 | 申请日 | 专利标题
    CH01992/14A|CH710542B1|2014-12-19|2014-12-19|Display device for a timepiece.|CH01992/14A| CH710542B1|2014-12-19|2014-12-19|Display device for a timepiece.|
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