• 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 constant force clock mechanism according to the invention comprises an input pinion (3); a mobile arranged to be rotated about a first axis by the input gear (3) and comprising a stopping star (4) and a driving gear (5); an escape wheel (7); a rotary drive wheel (10) rotatable about a second fixed axis with respect to the first axis; an arming wheel (8) coaxial with the thrust driving wheel (10) but free to rotate relative thereto, the winding wheel (8) being arranged to be driven by the driving wheel ( 5); a spring of constant force (9) arranged to be armed by the winding wheel (8) and to drive the escape wheel (7) and the driving wheel stop (10); and at least one abutment (15) arranged to be driven by the abutment drive wheel (10) and to lock the stopping star (4) and release it periodically to allow periodic arming of the constant force spring (9). ).
    公开号:CH712013A1
    申请号:CH00052/16
    申请日:2016-01-14
    公开日:2017-07-14
    发明作者:Barraud Mathieu
    申请人:Richemont Int Sa；
    IPC主号:
    专利说明:

    Description: [0001] The present invention relates to a clock mechanism with a constant force.
    In a mechanical watch movement, the oscillations of a regulating member are maintained by an exhaust which receives a force of a motor spring via a finishing gear. The force supplied to the exhaust is not constant but varies according to the state of winding of the mainspring. These variations disrupt the progress of the regulating organ and therefore reduce the accuracy of the watch. To remedy this problem, it is known to place an auxiliary spring, said constant force spring, in the work train between the mainspring and the exhaust. This auxiliary spring is periodically armed by the mainspring and drives the exhaust in place of the mainspring. The state of armature of the auxiliary spring varies little, so that the escapement receives a substantially constant force.
    For periodic arming of the auxiliary spring is usually used quite complicated mechanisms to adjust including parts such as cam, rocker or anchor. Also known from document CH 709 068 a constant-force mechanism comprising an input gear intended to be kinematically connected to a power source and mounted integral with a shaft which is also secured to a carrier. On the satellite carrier is rotated a satellite comprising a locking star and a pinion engaged with a fixed wheel coaxial with the shaft. The locking star cooperates with the flat side of a stop in the form of a half-cylinder secured to an output wheel mounted free to rotate on the shaft. A spring of constant force is fixed between the planet carrier and the output wheel. The output wheel meshes with an escape wheel. The stop, which slides on the teeth of the blocking star, periodically releases the latter and therefore the carrier to arm the spring of constant force under the action of the energy source. The meshing ratios and the cooperation between the locking star and the stop are determined in such a way that the carrier moves in one-second leaps, giving a dead second type indication.
    Although not using a cam, rocker or anchor, this mechanism according to the document CH 709 068 has several disadvantages: - It is bulky in height. Around the same shaft are mounted the input gear, the output wheel, the constant force spring, a bolt carrier (for fixing the constant force spring), the carrier and the fixed wheel ; - The friction between the tip of the teeth of the locking pin and the flat side of the stop are important. This friction causes a significant loss of energy and generates a resistant torque that can disrupt the running of the watch. In addition, these friction tend to wear the teeth of the blocking star and thus change the stopping point of these teeth on the stop, which affects the display accuracy of the second dead; it uses eccentric components which significantly increase the inertia of the assembly, which is all the more troublesome since the mechanism is placed near the regulating organ and undergoes accelerations and decelerations increased compared to to a conventional clockwork train because of the second dead.
    The present invention aims to remedy, at least in part, the aforementioned drawbacks and proposes for this purpose a constant force clock mechanism comprising: - a pinion input - a mobile arranged to be rotated around a first axis by the input pinion and comprising a stopping star and a driving wheel, - an escape wheel, - a rotary stop driving wheel about a second fixed axis relative to the first axis - a winding wheel coaxial with the driving wheel stop but free in rotation relative thereto, the winding wheel being arranged to be driven by the driving wheel winding, - a spring of substantially constant force arranged to be armed by the winding wheel and to drive the escape wheel and the thrust driving wheel, and - at least one stop arranged to be driven by the thrust driving wheel and to block er the stopping star and release it periodically to allow a periodic arming of the spring force substantially constant.
    In the context of the present invention, the term "train" refers to a direct or indirect drive.
    In a preferred embodiment, the input pinion, the stopping star and the driving gear are coaxial and integral (about the first axis) and the escape wheel and the driving wheel of stop are coaxial and integral (around the second axis).
    Preferably, the or each abutment is integral with a respective wheel arranged to be driven by the driving gear stopper and to rotate about a separate axis of the first and second axes.
    The or each abutment may be formed by a portion of a coaxial shaft and secured to said respective wheel.
    The or each abutment may have a convex sidewall and a second sidewall, the convex side serving as a bearing surface to the teeth of the stopping star to block the latter, the second side used to release the star of 'stop.
    The second side is for example flat or concave.
    In an exemplary embodiment, the or each abutment is in the form of a half-cylinder.
    Preferably, the constant force clock mechanism according to the invention comprises two said stops.
    According to another advantageous characteristic, the teeth of the stopping star are in the form of precious or semi-precious stones integral with a hub.
    In an exemplary embodiment, the teeth of the stopping star each comprise two planar flanks connected at their free end by a flat surface.
    Typically, the substantially constant force spring is spiral.
    The outer end of the substantially constant force spring can be attached to a pin carried by a coaxial support and secured to the winding wheel, and the inner end of the substantially constant force spring can be attached to a shaft on which are mounted the winding wheel, the support and the driving wheel stopper and which is integral with the driving gear stopper.
    [0018] Preferably, said axes are parallel.
    The constant force watch mechanism according to the invention may be arranged so that the stopping star is released once per second to allow the indication of a second dead.
    The present invention further provides a clock mechanism comprising a constant force clock mechanism as defined above, a tourbillon cage carrying the clock mechanism constant force and a fixed wheel coaxial to the vortex cage and meshing with the input gear.
    Other features and advantages of the present invention will appear on reading the following detailed description with reference to the accompanying drawings, in which: FIGS. 1 to 3 are respectively a plan view from above, a side plan view and a half perspective view of a constant force watch mechanism according to a preferred embodiment of the invention; fig. 4 is a diagrammatic plan view of a stop star and stops forming part of the constant force clock mechanism according to the preferred embodiment of the invention; figs. 5 and 6 are respectively a plan view from above and a planar side view of the constant force watch mechanism according to the preferred embodiment of the invention embedded in a tourbillon cage.
    With reference to FIGS. 1 to 3, a constant force clock mechanism 1 according to the invention, intended to be part of a watch movement such as a wristwatch or pocket watch movement, comprises, around a first shaft 2 d A axis, an input pinion 3, a stopping star 4 and a driving wheel 5. These three coaxial elements 3, 4 and 5 are integral with the shaft 2. The input pinion 3 receives a force of a power source, typically a barrel, of the movement. The stopping star 4 comprises teeth 4a advantageously constituted by precious or semi-precious stones (natural or synthetic), typically ruby, sapphire or garnet, embedded in a hub 4b. The teeth 4a have a shape similar to exhaust anchor pallets. They thus comprise (see FIG 4) two parallel flanks 4c connected at their free end by an inclined face 4d. The teeth 4a are evenly distributed around the hub 4b. In the illustrated example, there are four of them. Their radial position relative to the hub 4c can be adjustable.
    The constant force clock mechanism 1 further comprises, around a second shaft 6 whose axis B is distinct from the axis A and parallel and fixed with respect to the latter, an escape wheel 7, a winding wheel 8, a spring of constant force 9 in the form of a spiral and a driving wheel stop 10. The escape wheel 7, the inner end, designated by 9a, the constant force spring 9 and the wheel The driving wheel 10 is integral with the shaft 6. The winding wheel 8 is secured to a support 11 mounted to rotate freely about the shaft 6. This support 11 carries a pin 12 to which is fixed the outer end 9 of the spring of constant force 9. The escape wheel 7 cooperates with an escapement anchor which itself cooperates with a regulating member, typically a sprung balance, in a conventional manner.
    The winding wheel 8 meshes with the driving gear wheel 5. The driving wheel stopper 10 meshes with one or two (two in the example shown) movable abutment rotating each around a separate axis C A and B axes and parallel and fixed relative to these. Each abutment wheel comprises a wheel 13 and a shaft 14 around which is mounted the wheel 13 integrally. The wheel 13 is engaged with the thrust driving wheel 10. A portion 15 of the shaft 14 constitutes a stop in the form of a half-cylinder whose axis of the cylinder coincides with the axis C. Each abutment 15 thus comprises (see Fig. 4) a flat side 15a and a cylindrical blank 15b. The stops 15 have the function of blocking the stopping star 4 and releasing it periodically.
    In operation, the constant force spring 9 drives the escape wheel 7 which moves jerkily depending on the alternations of the regulating member. This displacement of the escape wheel 7 rotates, via the stop gear 10, each stop wheel 13, 14 and therefore each stop 15. As shown in FIG. 4, the stopping star 4 remains locked by one, 15 ', stops 15 against which rests one, 4a ", teeth 4a until
    权利要求:
    Claims (16)
    [1]
    that the flat flank 15a of the abutment 15 'is in front of the end of the tooth 4a', allowing the tooth 4a 'to pass and thus the stopping star 4 to be released. Under the action of the energy source of the movement, the mobile comprising the shaft 2, the input gear 3, the stopping star 4 and the driving gear 5 rotates until another tooth 4a "of the stopping star 4 comes to bear against the other stop 15". During this movement of the mobile 2 to 5, at an angle of 45 ° in the illustrated example, the winding wheel 8 is driven which arms the spring of constant force 9. Preferably, the release of the star d stop 4 occurs every second so that the jumps of the mobile 2 to 5 can be used to cause a second dead indicator. The force required to drive the escape wheel 7 is thus always provided by the constant force spring 9 and not by the energy source of the movement, so that it does not depend on the the state of arming of said energy source. The mechanism according to the invention is of simple design. It does not use parts such as cams, anchors or rockers for periodic arming of the constant force spring. It does not require precise adjustment either. In addition, it is compact in height because its components are distributed substantially balanced around the axes A and B. Another advantage of the mechanism according to the invention is that it produces little friction. As already indicated, the teeth 4a of the stopping star 4 are of precious or semi-precious stone such as ruby, sapphire or garnet, that is to say in a material that reduces friction. Moreover, as can be seen in LaFig. 4, the function of the flat blank 15a of each stop 15 is to make out the stop 15 of the path that the teeth 4a run through to let a tooth 4a and release the stopping star 4. The teeth 4a are never in contact with this flat flank 15a. During the entire duration of the stop of the stop star 4, the contact is made between a flat side 4c of a tooth 4a and the cylindrical side 15b of a stop 15. Any contact points on the sidewall is therefore avoid. In addition, as each stopper 13, 14 rotates on itself, around the fixed axis C, the moment of the friction force exerted by a tooth 4a in contact with a stop 15 is low. The lever arm corresponds in fact to the radius R of the cylindrical flank 15b, a radius which is very much smaller, for example, than the distance between the axis B and each stopper 15. In variants, the flank 15b could be given other convex shapes than a cylindrical shape, for example a spherical or barrel shape. Instead of a flat shape, the flank 15a could have a concave shape. Yet another advantage of the mechanism according to the invention consists in the fact that it is insensitive to manufacturing tolerances. Indeed, between the penultimate step of a stop wheel 13, 14 where the stop star 4 is still locked and the last step where the stop star 4 is released, the rotation angle the abutment wheel 13, 14 can be relatively large, 20 ° in the illustrated example. Such an angle of rotation offers great robustness in terms of display accuracy of the second dead. The mechanism according to the invention can easily be embedded in a tourbillon cage. For the purposes of the present invention, the term "vortex" means any rotating regulating system including the eddies themselves and the carousels. Figs. 5 and 6 show an exemplary embodiment of the mechanism 1 according to the invention mounted in a vortex cage 16. The shafts 2, 6 rotate in the cage 16, and the cage 16 also carries an exhaust anchor 17 with which the escapement wheel 7 and a regulating member (not shown) with which the exhaust anchor 17 cooperates. A coaxial second pinion 18 secured to the vortex cage 16 is driven by the energy source of the movement via a finishing gear. The input pinion 3 meshes with a fixed second wheel 19. Thus, each release of the stop star 4 by the stops 15 causes a jump of displacement of the tourbillon cage 16. The latter can carry a second hand and thus constitute a second dead indicator. The present invention has been described above by way of example only. It goes without saying that modifications could be made without departing from the scope of the claimed invention. For example, the input pinion 3 may not be coaxial with the mobile including the stopping star 4 and the driving wheel 5 but could mesh with the driving wheel 5 to drive said mobile. Another modification could be to move the escapement wheel 7 so that it is no longer coaxial with the winding wheel 8 and the thrust driving wheel 10 and that it is part of a mobile that would mesh, and would be driven by the thrust driving wheel 10. Claims
    1. Constant force watch mechanism comprising: - an input pinion (3), - a mobile arranged to be rotated about a first axis (A) by the input pinion (3) and comprising a star for stopping (4) and a driving gear (5), - an escape wheel (7), - a driving wheel (10) rotatable about a second axis (B) fixed relative to the first axis (A), - a winding wheel (8) coaxial with the thrust driving wheel (10) but free to rotate relative thereto, the winding wheel (8) being arranged to be driven by the driving gear (5), - a spring of substantially constant force (9) arranged to be armed by the winding wheel (8) and to drive the escape wheel (7) and the thrust driving wheel (10), and - at least one stop (15) arranged to be driven by the stop gear (10) and to lock the stop star (4) and the release periodically to allow periodic arming of the substantially constant force spring (9).
    [2]
    2. Watchmaker mechanism constant force according to claim 1, wherein the input gear (3), the stopping star (4) and the driving wheel (5) are coaxial and integral.
    [3]
    Constant-time watch mechanism according to claim 1 or 2, wherein the escape wheel (7) and the stop gear (10) are coaxial and integral.
    [4]
    Constant-time watchmaking mechanism according to one of claims 1 to 3, wherein the or each abutment (15) is integral with a respective wheel (13) arranged to be driven by the thrust driving wheel (10) and to rotate about an axis (C) distinct from the first and second axes (A, B).
    [5]
    5. Constant force watch mechanism according to claim 4, wherein the or each abutment (15) is formed by a portion of a shaft (14) coaxial and integral with said respective wheel (13).
    [6]
    6. constant strength watch mechanism according to one of claims 1 to 5, wherein the or each abutment (15) has a convex sidewall (15b) and a second sidewall (15a), the convex sidewall (15b) serving as a surface supporting the teeth (4a) of the stopping star (4) to block the latter, the second side (15a) serving to release the stopping star (4).
    [7]
    The constant force horological mechanism according to claim 6, wherein the second sidewall (15a) is planar or concave.
    [8]
    Constant-time watch mechanism according to one of claims 1 to 7, wherein the or each abutment (15) is in the form of a half-cylinder.
    [9]
    9. constant strength watch mechanism according to one of claims 1 to 8, comprising two said stops (15).
    [10]
    10. Constant force watch mechanism according to one of claims 1 to 9, wherein the teeth (4a) of the stopping star (4) are in the form of precious or semi-precious stones integral with a hub (4b).
    [11]
    11. Constant force watchmaking mechanism according to one of claims 1 to 10, wherein the teeth (4a) of the stopping star (4) each comprise two planar flanks (4c) connected at their free end by a surface plane (4d).
    [12]
    Constant-time watch mechanism according to one of claims 1 to 11, wherein the substantially constant force spring (9) is spiral.
    [13]
    13. constant-strength watch mechanism according to claim 12, wherein the outer end (9b) of the substantially constant force spring (9) is fixed to a stud (12) carried by a support (11) coaxial and integral with the winding wheel (8), and wherein the inner end (9a) of the substantially constant force spring (9) is fixed to a shaft (6) on which the winding wheel (8) is mounted, the support (11) and the thrust driving wheel (10) and which is integral with the thrust driving wheel (10).
    [14]
    Constant-time watch mechanism according to one of claims 1 to 13, wherein said axes (A, B, C) are parallel.
    [15]
    Constant-force watchmaking mechanism according to one of claims 1 to 14, arranged so that the stop star (4) is released once per second to allow the indication of a second dead.
    [16]
    16. Watchmaking mechanism comprising a constant force watch mechanism (1) according to one of claims 1 to 15, a vortex cage (16) carrying the clock mechanism constant force (1) and a fixed wheel (19) coaxial with the tourbillon cage (16) and meshing with the input gear (3).
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    同族专利:
    公开号 | 公开日
    CH712013B1|2019-10-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    CH98828A|1922-11-08|1923-05-01|Pellaton Schild A|Timepiece in which the escapement is driven by a constant driving force.|
    CH223109A|1941-10-01|1942-08-31|Theurillat Xavier|So-called constant force escapement device for clock movements, counters, etc.|
    CH703331A2|2010-06-17|2011-12-30|Blancpain Sa|Mechanism for advancing cage of karussel or tourbillon of mechanical timepiece, has star with trajectory interfering with another trajectory of whip to pivot cage and arrest cage, when star releases whip and not releases whip, respectively|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CH00052/16A|CH712013B1|2016-01-14|2016-01-14|Clockwork mechanism with constant force.|CH00052/16A| CH712013B1|2016-01-14|2016-01-14|Clockwork mechanism with constant force.|
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