EP3644129A1 - Flexibles steuerorgan - Google Patents

Flexibles steuerorgan Download PDF

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Publication number
EP3644129A1
EP3644129A1 EP18202244.2A EP18202244A EP3644129A1 EP 3644129 A1 EP3644129 A1 EP 3644129A1 EP 18202244 A EP18202244 A EP 18202244A EP 3644129 A1 EP3644129 A1 EP 3644129A1
Authority
EP
European Patent Office
Prior art keywords
flexible guide
guide member
neck
axis
rotation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP18202244.2A
Other languages
English (en)
French (fr)
Inventor
Frédéric Maier
James Hide
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Patek Philippe SA Geneve
Original Assignee
Patek Philippe SA Geneve
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Patek Philippe SA Geneve filed Critical Patek Philippe SA Geneve
Priority to EP18202244.2A priority Critical patent/EP3644129A1/de
Publication of EP3644129A1 publication Critical patent/EP3644129A1/de
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B21/00—Indicating the time by acoustic means
    • G04B21/02—Regular striking mechanisms giving the full hour, half hour or quarter hour
    • G04B21/06—Details of striking mechanisms, e.g. hammer, fan governor
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B15/00—Escapements
    • G04B15/06—Free escapements
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B15/00—Escapements
    • G04B15/06—Free escapements
    • G04B15/08—Lever escapements
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/045—Oscillators acting by spring tension with oscillating blade springs

Definitions

  • the present invention relates to a flexible guide member, a device comprising a component, typically a watchmaker, at least one such flexible guide member and a support, and a timepiece comprising such a device.
  • the flexible guide members are designed to pivot without a physical axis of rotation, therefore without friction, around a virtual axis of rotation, thanks to an arrangement of elastic parts.
  • Flexible guide members of the circular neck type are generally used in flexible guide systems, when the stiffness of the system must be low. These are typically beams of rectangular section and of variable thickness, the profile of which describes two concave semicircles. Such components have the advantage of having a low stiffness and of limiting the moments of elastic return, however, they have the disadvantage of not absorbing parasitic displacements.
  • FIGS. 12a and 12b represent, respectively in perspective and top view, a flexible guide member 101 of the type with circular necks according to the prior art.
  • the flexible guide member 101 extends longitudinally along an axis x. It generally has the shape of a rectangular parallelepiped of length L extending in the direction of the axis x, of width l extending in the direction of an axis y and of thickness e extending in the direction of a z axis
  • the flexible guide member 101 comprises two recesses 105a, 105b produced respectively in planar opposite surfaces F1, F2 of the flexible guide member 101, said recesses 105a, 105b facing each other so as to define between them a thinned area or neck 104 at which the width of the flexible guide member 101 is thinned over its entire thickness.
  • This neck 104 has a certain elasticity resulting from its width l neck , relatively thin.
  • the flexible guide member 101 comprises a first 102 and a second 103 rigid parts connected by said neck 104 elastically deformable so that said first 102 and second 103 rigid parts are able to pivot relative to each other around 'a virtual axis of rotation R, perpendicular to the x axis , parallel to the surfaces F1 and F2 and crossing the neck 104.
  • the recesses 105a, 105b typically take the form of half-cylinders of revolution with axes parallel to the axis z.
  • the profile of each of said recesses 105a, 105b is an arc of radius r.
  • the neck 104 in particular its width l neck , is dimensioned according to the stresses that it can bear.
  • the radius r is typically at least greater than five times the minimum width l neck , so as to avoid any concentration of stresses in the middle of the neck 104.
  • the flexible guide member 101 has a plane P 0 of vertical longitudinal symmetry including the virtual axis of rotation R and parallel to the surfaces F1 and F2.
  • any relative movement of the first part 102 with respect to the second part 103 other than a rotational movement around the virtual axis of rotation R is considered to be a parasitic movement, the parasitic movements typically including movements of torsion, stretching or transverse bending as well as shear stresses.
  • manufacture of such a flexible guide member 101 of the circular neck type is traditionally carried out by carrying out two separate machining operations, one to form each of the recesses 105a, 105b, for example from a block of material or substrate. in the shape of a rectangular parallelepiped.
  • machining faults can cause rotation of the virtual axis of rotation R in any direction, which results in the creation of a parasitic displacement.
  • a machining defect of the neck of 2 ° (typical value of the machining defect) generates a parasitic displacement of approximately 3% at the level of the guide member.
  • parasitic displacement may have no influence when considered alone.
  • the parasitic displacements can be in opposition and cause blockages or strong stiffness increases.
  • An object of the present invention is to provide a flexible guide member making it possible to overcome, at least in part, the aforementioned drawbacks.
  • the invention provides a flexible guide member extending longitudinally along an axis x and comprising first and second rigid parts connected by an elastically deformable neck, said first and second rigid parts being able to pivot one by relative to each other around a virtual axis of rotation perpendicular to the x axis by elastic deformation of said neck, said flexible guide member being characterized in that said neck is defined by a single hollow.
  • the neck is defined by a concave curve corresponding to a longitudinal section of said hollow and by a line segment located opposite this curve.
  • the profile of said recess is the same in all the cutting planes of said flexible guide member perpendicular to the virtual axis of rotation R.
  • said hollow crosses the entire thickness of the flexible guide member.
  • the flexible guide member according to the invention can be made of silicon (optionally oxidized), metal, plastic, ceramic, sapphire (aluminum oxide), beryllium or polymer.
  • the invention also provides a device comprising a component, in particular a watchmaking component, at least one flexible guide member according to the invention and a support, said at least one flexible guide member being able to guide the movements of said component relative to said support.
  • Said component can typically be a timepiece component, for example chosen from an escape anchor, a rocker, a pawl, a jumper, an oscillator and a clockwork hammer or only part of such a timepiece component.
  • clockwork hammer typically means a hammer such as a chronograph or striking hammer.
  • the device comprises at least two flexible guide members according to the invention arranged in series. These two bodies can be oriented in the same direction or be turned upside down.
  • the device according to the invention is monolithic.
  • the device according to the invention comprises at least two assemblies each comprising two flexible guide members according to the invention arranged in series, said assemblies being arranged in parallel.
  • Such a device typically allows the guiding of said component relative to the support essentially in translation.
  • the invention also provides a timepiece such as a wristwatch, a pocket watch, a pendulum or a pendulum comprising such a device.
  • flexible guide members “arranged in series” designates an arrangement in which the flexible guide members are mounted one after the other so that the second rigid part of one corresponds to the first rigid part of the other.
  • the neck of the flexible guide member according to the invention is only defined by a single hollow.
  • the machining of a single recess is sufficient to manufacture such a flexible guide member which halves the risk of machining defect compared to a flexible guide member according to the prior art with two necks. This is of great interest, in particular in cases where several guide members have to work together, typically when at least two flexible guide members work together, for example, when they are arranged in series.
  • the configuration of the flexible guide member according to the invention involves decentering the virtual axis of rotation relative to the flexible guide member.
  • the inventors have found that centering the virtual axis of rotation on the flexible guide member is not necessary even in cases where several guide members have to work together. In this case, what is important is that the different virtual rotation axes are parallel to each other.
  • a flexible guide member 1 generally has the shape of a rectangular parallelepiped of length L extending in the direction of an axis x, of width l extending in the direction of an axis y and of thickness e extending in the direction of an axis z.
  • the flexible guide member 1 comprises a first 2 and a second 3 rigid parts connected by a neck 4, corresponding to a thinned area of the flexible guide member 1, elastically deformable, said first 2 and second 3 rigid parts being suitable to pivot relative to each other about a virtual axis of rotation 100 by elastic deformation of said neck 4, said axis 100 being perpendicular to the x axis .
  • the flexible guide member 1 comprises six surfaces: F1, F2, F3, F4, F5 and F6, the surface F6 defining the top of the flexible guide member 1.
  • the surface F1 is planar and parallel to the x axis . It comprises a first surface F 1-2 of the first rigid part 2 and a first surface F 1-3 of the second rigid part 3.
  • the surface F2 is located opposite the surface F1. It typically extends in a plane parallel to that defined by the surface F1. As illustrated in figure 1a , the surface F2 comprises a second surface F 2-2 of the first rigid part 2 and a second surface F 2-3 of the second rigid part 3.
  • the faces F 2-2 and F 2-3 are plane and parallel to the flat surface F1.
  • the surface F2 also includes a recess 5. This recess 5 and a portion 6 of the surface F1 located opposite said recess 5 define between them the neck 4 at which the width " l " of the flexible guide member 1 is thinned , up to a minimum value " l col ", over its entire thickness e, as illustrated in Figures 1a and 1b .
  • This neck 4 has a certain elasticity resulting from the fineness of its minimum width l neck .
  • the width l neck is calculated so that the maximum stress exerted by the relative movements of the first 2 and second 3 parts relative to each other on said neck 4 is less than the elastic limit of the material constituting this neck 4.
  • the profile of said recess 5 is the same in all the planes of section of the flexible guide member 1 perpendicular to the virtual axis of rotation 100.
  • the hollow 5 of the flexible guide member 1 has the shape of a half-cylinder of revolution with an axis parallel to the virtual axis of rotation 100, of radius r and height e corresponding to the thickness e previously defined. .
  • the neck 4 is therefore defined, on the one hand by a concave semicircle of radius r and on the other hand by a line segment corresponding to the portion 6 of the flat surface F1.
  • the flexible guide member 1 is in particular such that in each of its cutting planes perpendicular to the virtual axis of rotation 100, the neck 4 is defined by this semicircle of radius r concave corresponding to a longitudinal section of said hollow 5 and by a line segment located opposite this curve.
  • the recess 5 and the neck 4 of the flexible guide member 1 typically comprise a plane (P) of symmetry (transverse), this plane being defined as the plane including the virtual axis of rotation 100 and being perpendicular to the first surface F1.
  • the guide member 1 according to the invention does not include a plane of vertical longitudinal symmetry such as the plane P 0 illustrated in Figures 12a and 12b , which would include the virtual axis of rotation 100 and which would be parallel to the surface F1.
  • the surfaces F3 and F4 of the flexible guide member 1 are typically planar, mutually parallel and perpendicular to the surfaces F1 and F2 as well as to the x axis and the surfaces F5 and F6 are typically planar, mutually parallel and perpendicular to surfaces F1, F2, F3 and F4.
  • a first step a) consists of providing a block of material 10 or substrate 10 whose shape is typically that shown in the figure 2 .
  • This particular substrate 10 has the shape of a rectangular parallelepiped of length L , of width l and of thickness e corresponding to the length L , width l and thickness e of the flexible guide member 1 to be produced.
  • a hollow 5 in the form of a half-cylinder of revolution with an axis parallel to the axis 100 extending over the entire width l of the substrate 10, is typically machined from the surface F2 of the substrate 10 to obtain the flexible guide member 1.
  • Such machining can typically be carried out by chip removal, but other techniques such as chemical etching or deep reactive ion etching (DRIE) are possible.
  • DRIE deep reactive ion etching
  • a flexible guide member according to the invention can also be obtained without a machining step, for example by galvanic growth, injection, molding, or forging.
  • the device 20 illustrated in figure 3 comprises a part of an escape anchor, namely a body 22 of an escape anchor, a flexible guide member 1 and a support 21 of said escape anchor.
  • the first rigid part 2 of the flexible guide member 1 is integral with the support 21 itself fixed on a frame 200 such as a plate, a bridge or a tourbillon cage for example using a screw 23; and the second rigid part 3 is integral with said body 22.
  • the flexible guide member 1 makes it possible to guide the body 22 in rotation relative to the support 21 around the axis 100.
  • the guiding in rotation of the body 22 of the exhaust anchor relative to the support 21 is typically done on angles of rotation of between 5 ° and 40 °.
  • the support 21, the flexible guide member 1 and the body 22 of the escape anchor could form a monolithic assembly.
  • the device 30 illustrated in figure 4 comprises a movable frame of an escape anchor, four flexible guide members 41, 42, 51, 52 such as the flexible guide member 1, and a support 36 of said escape anchor.
  • the movable frame 31 cooperates on the one hand with an escapement wheel 32 of a clockwork mechanism and on the other hand with the plate pin 33 of a balance plate 34.
  • the mobile frame 31 is designed to perform movements in translation in both directions indicated by arrow 35.
  • the movable frame 31 is guided in translation by a translational guide device comprising first 40 and second 50 identical assemblies, arranged in parallel and connecting the movable frame 31 to a fixed support 36 on a frame 300 such as a turntable, a bridge or a tourbillon cage, for example using screws 37.
  • a translational guide device comprising first 40 and second 50 identical assemblies, arranged in parallel and connecting the movable frame 31 to a fixed support 36 on a frame 300 such as a turntable, a bridge or a tourbillon cage, for example using screws 37.
  • first 51 and second 52 flexible guide members are mounted one after the other so that the second rigid part 53 of said first flexible guide member 51 corresponds to the first rigid part 53 of said second flexible guide member 52, it is said that they are mounted “in series”.
  • the second rigid part 43 of said first flexible guide member 41 of the first set 40 is also the first rigid part of the second flexible guide member 42 of the first set 40.
  • the first 40 and second 50 sets are arranged in parallel.
  • the movable frame 31 is integral with both the first rigid part 44 of the first flexible guide member 41 of the first assembly 40 and the first rigid part 54 of the first flexible guide member 51 of the second assembly 50; and the support 36 is in turn integral with both the second rigid part 46 of the second flexible guide member 42 of the first assembly 40 and of the second rigid part 56 of the second flexible guide member 52 of the second assembly 50.
  • the flexible guide members 41, 42, 51, 52 thus arranged form a device for guiding in translation.
  • This translational guidance device is similar to a “four-neck table” type device as defined in the book. “Design of flexible guides” Simon Henein, 2003, Meta . Note that, in general, the “circular necks” of the guide members of the circular neck type described in this work could be replaced by guide members according to the invention.
  • the four axes of rotation 401, 402, 501, 502 of the necks of the flexible guide members 41, 42, 51, 52 are substantially parallel. This has the advantage of limiting blockages and / or large increases in stiffness.
  • the support 36, the translational guide device comprising the four flexible guide members 41, 42, 51, 52 and the movable frame 31 of the exhaust anchor could form a monolithic assembly.
  • the hollow 5 could, for example, take other forms than that previously described, as illustrated in figures 6a to 6e and 7 .
  • the first and second rigid parts, the first and second surfaces, the virtual axis of rotation, the neck, the hollow and the plane (P) of the variants of flexible guide members according to the invention illustrated are designated by the same markers that in the figure 1a .
  • the recess 5 could, for example, correspond only partially, typically only at its bottom, to the surface of part of a cylinder of revolution, as illustrated in FIG. figure 6a .
  • the neck 4 would then typically be defined by two segments of straight lines which are mutually parallel, perpendicular to the plane defined by the flat surface F1 and connected by two connecting fillets to an arc of a circle.
  • the hollow 5 could be such that, in top view, the neck 4 would be defined by a portion of ellipse, as illustrated in the figure 6b .
  • the hollow 5 could also not include a rounding, and take a triangular or more generally polygonal shape, as illustrated in figures 6c and 6d .
  • the hollow and the neck of the flexible guide member according to the invention typically comprise a plane of symmetry (P) defined as the plane including the virtual axis of rotation 100 and being perpendicular to the first surface F1.
  • P plane of symmetry
  • This is particularly the case in the embodiments shown in Figures 1a and 6a to 6d .
  • they may also not include such a plane of symmetry, as in the example illustrated in the figure 6e .
  • This will not affect the orientation of the virtual axis of rotation 100 with respect to the first surface F1.
  • the virtual axis of rotation 100 will be located in the thinnest part of the neck corresponding to the area having the lowest flexural strength.
  • the flexible guide member could have an overall shape different from that of a rectangular parallelepiped. It could for example have a generally cylindrical shape, typically in the form of a straight cylinder with a convex base, for example with a circular, oval base or in the form of a deltoid involute, as illustrated respectively in the Figures 8a to 8c , 9 and 10 .
  • Such flexible guide members are typically produced simply by machining a recess on one side of a substrate in the form of a straight cylinder with a convex base.
  • the part of the hollow 5 defining the thinnest part of the neck 4 has dimensions of length, width ( l neck ) and thickness adjusted to avoid creating an overly elastic neck and / or the presence of several virtual axes of rotation.
  • the flexible guide members according to the invention When the flexible guide members according to the invention are arranged in series, they can, as illustrated in figures 4 , 5a and 5b be oriented in the same direction. Alternatively, they can also be turned upside down, as illustrated in Figures 11a and 11b .
  • the body 22 of the escape anchor of the device 20 could be replaced by all or part of the following components: a rocker, a pawl, a jumper, an oscillator or a clockwork hammer.
  • the movable frame 31 of the device 30 could be replaced by all or part of the following components: an escape anchor, a rocker, a pawl, a jumper or an oscillator.
  • a flexible guide member according to the invention can typically be used to replace a guide member in rotation in any component, typically watchmaker, guided in rotation, typically over an angular range less than 45 °, preferably less at 25 °, preferably less than 10 °, more preferably less than 2 °.
  • Translation guide devices using several flexible guide members according to the invention can typically be used to replace a translation guide device in any component, typically a watchmaker, comprising a translation guide device.
  • At least two sets each comprising a first and a second flexible guide members according to the invention are arranged in series, the first rigid parts of the first flexible members of each of said at least two sets being integral with each other and the second rigid parts of the second flexible members of each of said at least two assemblies being integral with each other.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Media Introduction/Drainage Providing Device (AREA)
EP18202244.2A 2018-10-24 2018-10-24 Flexibles steuerorgan Pending EP3644129A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18202244.2A EP3644129A1 (de) 2018-10-24 2018-10-24 Flexibles steuerorgan

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18202244.2A EP3644129A1 (de) 2018-10-24 2018-10-24 Flexibles steuerorgan

Publications (1)

Publication Number Publication Date
EP3644129A1 true EP3644129A1 (de) 2020-04-29

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Family Applications (1)

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EP18202244.2A Pending EP3644129A1 (de) 2018-10-24 2018-10-24 Flexibles steuerorgan

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EP (1) EP3644129A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0773483A (ja) * 1993-08-31 1995-03-17 Nec Corp 光ディスク用対物レンズ駆動装置
WO2014189463A1 (en) * 2013-05-22 2014-11-27 Ismail Mohamed Sirajudeen Mohamed A mechanism for effecting a displacement output
CH712958A2 (fr) * 2016-09-27 2018-03-29 Csem Ct Suisse Delectronique Microtechnique Sa Rech Developpement Elément oscillant et oscillateur mécanique horloger comprenant un tel élément oscillant.
CH713288A1 (fr) * 2016-12-23 2018-06-29 Sa De La Manufacture Dhorlogerie Audemars Piguet & Cie Composant monolithique flexible pour pièce d'horlogerie.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0773483A (ja) * 1993-08-31 1995-03-17 Nec Corp 光ディスク用対物レンズ駆動装置
WO2014189463A1 (en) * 2013-05-22 2014-11-27 Ismail Mohamed Sirajudeen Mohamed A mechanism for effecting a displacement output
CH712958A2 (fr) * 2016-09-27 2018-03-29 Csem Ct Suisse Delectronique Microtechnique Sa Rech Developpement Elément oscillant et oscillateur mécanique horloger comprenant un tel élément oscillant.
CH713288A1 (fr) * 2016-12-23 2018-06-29 Sa De La Manufacture Dhorlogerie Audemars Piguet & Cie Composant monolithique flexible pour pièce d'horlogerie.

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
RENYI YANG ET AL: "Design and characterization of a low-profile micropositioning stage", PRECISION ENGINEERING, 1 January 1996 (1996-01-01), pages 20 - 29, XP055574984, Retrieved from the Internet <URL:https://www.sciencedirect.com/science/article/pii/0141635995000321> [retrieved on 20190327], DOI: 10.1016/0141-6359(95)00032-1 *
YI-LING YANG ET AL: "A new piezo-driven microgripper based on the double-rocker mechanism", SMART MATERIALS AND STRUCTURES., vol. 24, no. 7, 26 June 2015 (2015-06-26), GB, pages 075031, XP055574933, ISSN: 0964-1726, DOI: 10.1088/0964-1726/24/7/075031 *

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