DISPLAY DEVICE OF A CLOCKWORK

Description

Scope of the invention

[0001] The invention relates to a clockwork display mechanism, comprising at least one display including a shaft, and including at least one plate and / or bridge carrying at least one guiding device, to carry and guide this shaft.

[0002] The invention further relates to a timepiece comprising at least one such timekeeping display mechanism, and / or at least one such guiding device.

[0003] The invention relates to the field of watch display mechanisms. Background of the invention

[0004] In a watch movement, the hour, minute, and second values ​​are generally displayed using hands. These hands must not touch each other, nor touch the dial, any movement components, or the crystal.

[0005] Several factors influence safety between needles: the play of the shaft carrying each needle; the inclination of the shaft, relative to a plate or a bridge, due to the location, ovality, and form defect of the guides; the inclination of the shaft due to play in the guide pivots; the chain of tolerances; the form tolerances, and in particular the flatness and perpendicularity of the needle pressed onto the shaft.

[0006] Naturally, the problem is similar if the displays are not needles, but discs, rings, or other things.

[0007] The problem of needles touching each other is also related to the fact that the bearing span, that is, the distance between the guide bearing surfaces, of the shaft supporting the needle is relatively short. The leverage effect considerably amplifies, at the needle tip, any defect in one of the shaft guides. In this scenario, it turns out that the main contributor to the reduced safety between the needles is the inclination due to play in the pivots (more than 50%).

[0008] We are particularly interested here in the variation of the inclination of the seconds hand in one revolution, which can be likened to a beat.

[0009] To prevent the hands from leaning and touching, at least one spring is generally placed on the arbor supporting the hand. The frictional torque generated by this spring is very difficult to control and directly influences the balance wheel's amplitude, chronometric performance, and the efficiency of the mechanism. Mechanisms with multiple leaf springs are known, which function to provide both guidance and friction braking simultaneously. The arbor's equilibrium position is determined by the rigidity of these spring elements, which are the leaves that exert a restoring force when the arbor is out of its equilibrium position.

[0010] The random orientation of such a shaft in the gravitational field, when the timepiece is a watch worn by its user, only makes it more difficult to keep a shaft perpendicular to a plate or bridge.

[0011] The EP2781971 document in the name of NIVAROX describes a clockwork mechanism structure for receiving and guiding a pivoting mobile, which includes a non-removable one-piece structure having pivot points aligned in pairs for receiving pivots of such a pivoting mobile.

[0012] Document CH358383 on behalf of JUNGHANS describes a device for holding an alarm setting shaft in clocks, which is a radially acting element that exerts friction on the shaft.

[0013] Document JP S54 13758 on behalf of CITIZEN describes an improvement relating to the fixing of a support or pivot stone in a substrate by local fusion using a laser.

[0014] Document EP2977829, issued on behalf of ETA Manufacture Horlogère Suisse, describes a watchmaking braking assembly comprising a shaft with a first surface cooperating in pivoting guidance with a second surface of a wheel mounted pivotally on the shaft. This second surface has a braking surface on a shoe subjected to the action of an elastic return means, integral with the wheel, and arranged to exert a radial force about the pivot axis on said first surface. This assembly includes intrinsic means for adjusting, by discrete values, the friction exerted by the braking surface on the first surface. Summary of the invention

[0015] The invention aims to solve the problem of a display's wobble, in particular a display hand, and to prevent a display, such as a small seconds hand, or a power reserve indicator, or other, from touching another display such as the hour hand, and / or from touching the dial or a fixed component of the movement or case by means of a radial guide.

[0016] The invention also aims to limit as much as possible the variation of the display's tilt in one revolution.

[0017] To avoid any unpleasant optical phenomenon for the user, such as a flickering phenomenon or similar, the invention proposes to limit, or even eliminate, the display's wobble due to play, and in particular to gear play.

[0018] To control the chronometric properties, it is still necessary to control any loss of amplitude induced by the friction of a spring against a shaft.

[0019] For this purpose, the invention relates to a clockwork display mechanism according to claim 1.

[0020] The invention also relates to a clockwork movement comprising at least one such guiding device.

[0021] The invention also relates to a timepiece, in particular a watch, comprising at least one such timekeeping movement, and / or at least one such guiding device. Brief description of the drawings

[0022] Other features and advantages of the invention will become apparent upon reading the detailed description that follows, with reference to the attached drawings, where: there figure 1represents, schematically, partially and in perspective, a display mechanism according to the invention, illustrating the guidance of a shaft carrying a display, here a needle, guided by two guide bearings according to the invention, each comprising an elastic blade in contact with the shaft and imposing a very slight braking force, opposite a double support surface, here constituted by a V-shaped bearing; these support surfaces each have a bisecting plane passing through the theoretical axis of rotation of the shaft, and, advantageously, these two bisecting planes are angularly offset from each other; the figure 2 represents, schematically and in plan view, one of the guide bearings of the figure 1 ; there figure 3 represents, in a similar way to the figure 2 , another similarly arranged guide bearing with lugs on its periphery for locking it into a cap or structure; the figure 4 represents, in a similar way to the figure 2 , a guide bearing fixed to a structure by a pin between leather and flesh; the figures 5 to 7 They illustrate, in a very schematic way, in a plane perpendicular to the axis of rotation of the shaft, three types of connection between the shaft and the bearing surface: figure 5 : cylinder-plane connection; figure 6 : cylinder-concave surface connection; figure 7 : cylinder-convex surface connection; the figures 8 to 10 They illustrate, in a very schematic way, in a plane perpendicular to the axis of rotation of the shaft, three types of connection between the shaft and the elastic blade: figure 8 : cylinder-plane connection; figure 9 : cylinder-convex surface connection; Figure 10 : cylinder-concave surface connection; the figure 11 represents, in a similar way to the figure 2, another guide bearing of similar design, comprising substantially cylindrical bearing surfaces on its periphery, as well as an external elastic blade, for its secure retention in a cap or structure; the figure 12 represents, schematically, partially, and in cross-section through the axis of rotation of the shaft, a guiding device comprising such a single guide bearing; the figure 13 represents, schematically, partially, and in cross-section through the axis of rotation of the shaft, a guiding device comprising a guide bearing according to the figure 3 mounted in a cabochon, and another classic bearing; the figure 14 is a view in another cutting plane of the guiding device of the figure 13 ; I them Figures 15 to 20illustrate, in a very schematic way, in cross-sectional view in a plane passing through the axis of rotation of the shaft, different assembly variants of such guiding devices or guide bearings; Figures 17 to 20 illustrate specific cases where the guide bearings have a shoulder forming a stop, unlike all the figures 1 to 16 where each lateral outer surface of the guide bearings is parallel to the axial direction; the figure 21 is a block diagram representing a watch with a display mechanism and such a guiding device. Detailed description of preferred embodiments

[0023] The invention relates to a clockwork display mechanism 100, comprising at least one display 10 having a shaft 3, and comprising at least one plate 101 and / or a bridge 102 carrying at least one guide device 1 for carrying and guiding such a shaft 3. This clockwork display 10 is in particular, and not limited to, a hand, a disc, or the like, and comprises a shaft 3, or is mounted on a shaft 3.

[0024] This guide device 1 includes a housing 2, which is arranged for the passage of a shaft 3 of a display 10, or which is arranged to directly carry a display 10. The guide device 1 includes at least one guide bearing 4 for guiding such a shaft 3 around an axis D.

[0025] According to the invention, this at least one guide bearing 4 comprises, on a first side of the axis D, a bearing surface 5, including a V-block or a bushing, or similar, arranged to center the axis of revolution of a shaft 3 on a bisecting plane P of the bearing surface 5. This bearing surface 5 is symmetrical with respect to the bisecting plane P, which passes through the axis D. The same guide bearing 4 comprises, on a second side of the axis D, opposite the first side, at least one retaining element 6, which is arranged substantially diametrically opposite to the bearing surface 5. It is understood that the bearing surface 5, symmetrical with respect to its bisecting plane P, actually comprises two elementary bearing surfaces, referenced 51 and 52 in certain figures.

[0026] According to the invention, all the retaining elements 6 are arranged to exert on a shaft 3 a resulting elastic restoring force directed towards the axis D, and to prevent radial exit, out of this at least one guide bearing 4, of a shaft 3 inserted axially along the direction of the axis D in this same guide bearing 4.

[0027] The slight friction exerted on the shaft by each retaining element 6 provides braking that prevents any chattering or fluttering of the display 10. Especially when the display 10 is small in diameter and has low inertia, such as a small seconds or power reserve indicator hand, or similar, the shaft diameter is very small, and the impact on the efficiency of the watch movement caused by this imposed friction is almost negligible. Since this friction is constant, the chronometric properties are practically unaffected.

[0028] More specifically, each retaining element 6 is a leaf spring arranged to bear against the periphery of a shaft 3.

[0029] More specifically, at least one guide bearing 4 has a single retaining element 6. The figures illustrate a particular, non-limiting case where each guide bearing 4 has a single retaining element.

[0030] The contact surfaces between the shaft 3 and the guide bearing 4, both at the bearing surface 5 and at an opposing contact surface 60, can take various forms, from simple point contact to very encompassing contact between complementary surfaces. Point contact ensures less friction but generates wear and impairs movement; encompassing contact corresponds to high friction and a loss of efficiency in the mechanism. In the specific application of displays, a good compromise lies in substantially linear contact: each contact surface extends around a straight line segment. The invention is illustrated in the figures for the particular case where these straight line segments are all parallel to each other and parallel to the theoretical axis D of rotation of the shaft 3; this solution is preferred because it generates little wear, low and controlled friction, and minimally affects efficiency.

[0031] However, one can imagine contact surfaces that are substantially linear but not parallel, for example on the generatrices of a cone, to tend to push the shaft in a certain direction for play compensation for example, but with of course an alteration of the efficiency.

[0032] These contacts can be of the cylinder-plane type, as symbolized on the Figures 5 And 8 , but also of the male-female cylinder type as seen on the figures 6 And 10 , or of the male-to-male cylinder type as seen on the figures 7 And 9 , it is noted that the cylindrical configuration is only a special case, advantageous to realize, of a surface more generally concave or convex: we can thus have plane-convex, concave-convex, convex-convex tape links.

[0033] Thus the preferred case illustrated, comprising three substantially linear contact surfaces, is a special, non-limiting case which is the most advantageous for these display applications.

[0034] This at least one guide bearing 4 is a board with parallel faces.

[0035] More specifically, all other surfaces it comprises, besides the two parallel surfaces that axially define its limits, are parallel to the same axial direction (perpendicular to the two parallel faces): the guide bearing 4 can be extruded, stamped, or even milled using simple 2D contour machining, which allows for low-cost manufacturing. Furthermore, the guide bearing 1 can be mounted reversibly while still performing its function.

[0036] In a particular and economical variant, the external surface 7 is unique, and is of revolution around the axis D.

[0037] THE Figures 1 , 2 , 4, 16 , illustrate very simple designs where the guide bearing 4 has an external surface 7, referred to here as lateral, which is cylindrical, perpendicular to the two parallel faces of this guide bearing 4.

[0038] THE figures 3 , 13 and 14 illustrate a variant where this outer surface 7 has raised features 75, shown here as protruding, but which can just as easily be recessed, relative to such a cylindrical surface, and which are intended to cooperate with complementary recessed, or respectively protruding, features in a housing formed in a plate 101 or a bridge 102 and arranged to receive this guide bearing 1; in this example the guide bearing 1 can be assembled in three positions 120° apart. The guide bearing 1 here has the shape of a star.

[0039] Naturally, the connection between a guide bearing 1 and a plate 101 or a bridge 102 can also be indirect, notably through a cap 103 as illustrated by the figure 13 or 14 .

[0040] In an unillustrated variant, the guide bearing 1 may also include a single relief 75 arranged to cooperate with a single complementary relief to achieve a unique angular orientation of the guide bearing 1 relative to the plate 101 or the point 102, so as to allow the axis of a shaft 3 to move within a given plane. In still other variants, the number and angular arrangement of the reliefs 75, or of the complementary reliefs of the plate 101 or the bridge 102, allow for other relative angular combinations between these components.

[0041] THE figures 11, 12 , And 15illustrate a variant where the guide bearing 1 includes at least one elastic blade 9 for its retention with clamping in a chamber or housing; the figure 11 shows a guide bearing 1 comprising two sectors 701, 702, of the same cylinder for its support in a cylindrical chamber or bore, and such an elastic blade 9 carrying at its distal end a third cylindrical sector 703 identical to the previous ones, to ensure perfect centering, well maintained by the elasticity of the blade 9.

[0042] THE Figures 17 to 20 illustrate another variant where the outer surface 7 is supported.

[0043] More specifically, the guide device 1 comprises a plurality of guide bearings 4 separated axially along the direction of the axis D; this is the classic arrangement with a lower bearing 41 and an upper bearing 42, as seen for example on the figure 1More specifically, at least two of these guide bearings have distinct bisecting planes P, as seen on the figure 1 , where the bisecting plane P1 of the lower ve-shaped bearing surface 5 of the lower bearing 41 forms a non-zero, non-flat angle with the bisecting plane P2 of the upper ve-shaped bearing surface 5 of the upper bearing 42. This arrangement provides the advantage of creating non-coplanar reaction forces, and of avoiding a concentration of forces in a single direction.

[0044] The guiding device 1 may also comprise only one such single guiding bearing 4, as seen in the examples of Figures 12 And 15 .

[0045] More specifically, at least one guide bearing 4 is removable, and includes at least one external surface 7, which is arranged to cooperate in a complementary manner with a housing 20, 201, 202, of a plate 101 or of a bridge 102, or any similar structural or support element, at least in a plane perpendicular to the axis D.

[0046] The least expensive execution of such a dwelling 20, 201, 202, is a drilling, the figure 4This illustrates this simple and non-limiting example of a circular housing 201, made after drilling a hole for the housing of a pin 105, the bearing 4 has on its periphery the complementary part of this hole, and a pin 105 housed between leather and flesh ensures the precise angular orientation of the guide bearing 4 with respect to the plate 101 or the bridge 102. Naturally many other embodiments are possible, for example with an orientation flat on the periphery of the bearing 4, or other, and their choice is guided by the dimensioning and the machining cost.

[0047] More particularly, this at least one external surface 7 comprises at least a first axial stop surface 71, which is arranged to cooperate in axial stop support, along the direction of the axis D, with a complementary support surface 1020,1021, which comprises a plate 101 or a bridge 102, or a cap 103 arranged to be mounted in a plate 101 or a bridge 102, or similar.

[0048] More specifically, this at least one external surface 7 also includes a second axial thrust surface 72 arranged to cooperate in axial thrust bearing, along the direction of axis D, with a complementary bearing surface 1012, 1022, which is comprised of a plate or a bridge, on the side opposite to that of the first axial thrust surface 71. figure 9 illustrates such a configuration with a bearing made in two parts 42 and 43. In the case of a monobloc execution, part 43 is advantageously a deformable elastic lip allowing the axial insertion of this bearing 4 into the housing 202 of the bridge 102, and its clipping onto this bridge after release of this lip.

[0049] More specifically, the guide bearing 4, carrying this at least one external surface 7, includes at least one elastic blade 9 for its elastic retention in a chamber 20, 201, 202, or a bore, which is provided by a plate 101 or a bridge 102 to receive this guide bearing 4, as visible on the figure 18The first axial thrust surface 71 is advantageously arranged to limit the axial deformation of at least one elastic blade 9 located in its immediate axial vicinity along the direction of axis D, thus protecting it against impacts. Naturally, this elastic blade 9 can also be arranged to cooperate with the chamber 20, 201, 202 and a lateral surface 1011, 1012, 1021, 1022 of the plate or bridge. In yet another variant, the same bearing 4 comprises several such elastic blades 9, and in particular at least one to cooperate radially with the bore, and one to cooperate axially with a thrust bearing surface perpendicular to axis D. The guide bearing 4 of the figure 11 includes such an elastic blade 9, as well as substantially cylindrical bearing surfaces 701, 702, 703, on its periphery 7.

[0050] More specifically, at least one elastic blade 9 is axially interposed between the first axial stop surface 71 and the second axial stop surface 72, as visible on the figure 19 .

[0051] The type of embodiment of the guide bearing 4 according to the invention is variable depending on the desired assembly method.

[0052] In a first variant, the guide bearing 4 includes at least one rigid peripheral part having at least one such external surface 7.

[0053] In a second variant, the guide bearing 4 includes at least one elastic peripheral part having at least one such external surface 7.

[0054] More specifically, at least one guide bearing 4 is a single unit and comprises, on a single component, both the bearing surface 5 and all the retaining elements 6 of that bearing. Even more specifically, when the guide bearing comprises one or more elastic blades 9, this guide bearing 4 is advantageously a single unit and comprises, on a single component, both the bearing surface 5 and all the retaining elements 6 and all the elastic blades 9 of that bearing.

[0055] More specifically, at least one guide bearing 4 is made of micromachinable material. It can notably be made of silicon and / or silicon dioxide, of DLC “diamond like carbon”, or similar, by a process of the “LIGA” or “MEMS” type or similar.

[0056] In another embodiment, at least one guide bearing 4 is made of elastic metal alloy.

[0057] In another embodiment, at least one guide bearing 4 is made of a plastic or composite material allowing the production of elastic blades in the usual temperature and humidity ranges for watches.

[0058] More specifically, the external surface 7 of the guide bearing 4 has at least one protruding or recessed relief 75, which is arranged to cooperate in a complementary manner with an indexing element on a plate or bridge for a unique angular orientation of the guide bearing 4 carrying this at least one external surface 7 relative to this indexing element. This variant is illustrated by the figure 3 where the guide bearing 4 has three lugs 75 spaced at 120°. A particular method of mounting such a guide bearing is as follows: The guide bearing 4 with brake is pre-assembled in a cap or end cap; this cap or end cap is then fitted into a blank and clamped; the clamping force induced by tightening the cap or end cap tightens the guide bearing 4 with brake into the cap's housing. Peripheral lugs prevent over-stressing the brake in its housing, which could cause breakage of a retaining element 6. These lugs penetrate the cap, and the guide bearing 4 with brake is finally crimped through the lugs.

[0059] The advantage of this solution is that it allows the brake guide bearing 4 to be removed by pressing out the plug from the blank. While possible, pressing or pressing the brake guide bearing 4 directly into the blank is more difficult. Using an intermediate plug or cap allows this pressing / riveting operation of the brake to be performed within the plug. In case of failure during the pressing / riveting operation, only the brake contained within the plug, and not the entire blank which is more expensive, will be rejected. Figures 13 and 14 illustrate such an assembly with an intermediate 103 cabochon.

[0060] THE figures 2 to 4 illustrate guide bearings 4 according to the invention, which include one or more holes 49, for identification purposes, the very small dimensions of these bearings not allowing any other type of identification marking.

[0061] Advantageously, the plate 101 and / or the bridge 102 includes at least one chamber 201, 202, which is arranged to receive such a guide bearing 4 of the guide device 1 for guiding the shaft 3 along the direction of the axis D.

[0062] More specifically, this mechanism 100 comprises a plate 101 and a bridge 102 which are axially separated along the direction of the axis D.

[0063] In a first variant, this mechanism 100 includes at least one guide bearing 4 which, together with the plate 101 or the bridge 102, forms a non-removable assembly. The bearing 4 is notably pressed and / or bonded and / or welded, in particular by laser welding, and / or brazed, and / or riveted, to the plate 101 or the bridge 102, or similar.

[0064] In a second variant, the mechanism 100 includes at least one guide bearing 4 removable relative to the plate 101 or the bridge 102. In one variant, the guide bearing 4 includes for this purpose at least one elastic element, in particular an elastic blade 9; in another variant, it is the plate 101 or the bridge 102 that includes such an elastic element; in yet another variant, both the guide bearing and the plate 101, or the bridge 102, each include at least one such elastic element.

[0065] The invention further relates to a clockwork movement 1000 comprising at least one such clockwork display mechanism 100, and / or at least one such guiding device 1.

[0066] The invention further relates to a timepiece 1000 comprising at least one such timepiece display mechanism 100, and / or at least one such guiding device 1. More particularly, this timepiece 1000 is a watch.

[0067] In summary, the invention allows a bearing surface 5, for example a V, to be rigidly positioned in the watch movement, in particular at the level of a plate or a bridge, or other structural element, so that the position of the shaft of the moving part is imposed by the position of this bearing surface 5, and achieves radial guidance.

[0068] The guide bearing 4, which includes this bearing surface 5, can be fixed in various ways, including but not limited to: by a non-removable, or at least very difficult to remove, fixing, for example by pressing, riveting, or similar, or by laser spot welding, brazing, or other means. A particular embodiment is that of a circular brake fixed in the blank, for example by riveting: cap or cap 103, brake. This brake has a circular circumference. It is riveted to the blank around its circumference, and thus each V-block for positioning the shaft is integral with the clockwork mechanism. The play occurs between the cap or cap 103 of the plate and the brake fixed in a bridge, for example, a calendar plate. This configuration also allows the shaft to be held in place when the display is removed, particularly a hand. by reversible elastic fixing, in a manner analogous to a circlip.This variant prevents potential deformation of a guide bearing that is irreversibly fixed by deformation or any non-removable fastening. The use of at least one elastic blade, similar to a circlip, ensures the independent retention of the guide bearing 4, which acts as a brake, within the blank. This allows for the functions of retaining the bearing within the blank, providing radial and axial guidance, and acting as a brake.

[0069] The figures only illustrate a few specific configurations, and are not exhaustive.

[0070] In particular, a guide bearing according to the invention with a braking function can be mounted on the dial side, instead of being conventionally sandwiched between the blanks; the clearance then occurs between a stopper, or a cabochon 103, and the adjacent blank, as visible on the figure 15 .

[0071] The invention offers several advantages: the control of the braking torque by friction, in particular when the guide bearing 54 is made by a very reproducible “LIGA” process; the friction torque then depends only on the variation of the diameter of the pinion fixed to the display shaft, which ensures the improvement of the display's float, in particular a hand, visible to the user of a watch; the holding of the display, in particular a hand “flat”, that is to say parallel to the plates and bridges, preventing it from coming into contact with another display, another hand or with the dial or a structural element of the watch; the alternative to an elastic blade of the circlip type is removable.

[0072] These miniature components are easily integrated into a minimal footprint and can be installed in various positions, including power reserve, small seconds with variable arbor spacing, or other configurations.

Claims

1. A timepiece display mechanism (100), comprising at least one display (10) comprising a shaft (3), and comprising at least one plate (101) and / or a bridge (102) carrying at least one guide device (1) for carrying and guiding a said shaft (3), said at least one guide device (1) comprising a housing (2) arranged for the passage of a shaft (3) of a display (10) or arranged to carry a display (10), and comprising at least one removable guide bearing (4) for guiding a said shaft (3) around an axis (D), where said at least one guide bearing (4) is a platform with parallel faces, and includes, on a first side of said axis (D), a support surface (5) comprising a V-shape or a pad and arranged to centre the axis of revolution of a said shaft (3) on a bisector plane (P) of said support surface (5) which is symmetrical with respect to said bisector plane (P) which passes through said axis (D), and on a second side of said axis (D), opposite said first side, at least one holding element (6) disposed substantially diametrically opposite said support surface (5), and where all said holding elements (6) are arranged to exert on a said shaft (3) a resultant elastic return force directed towards said axis (D), and to prevent a radial exit, out of said at least one guide bearing (4), of a shaft (3) inserted axially in the direction of said axis (D) in this same guide bearing (4), characterised in that at least one said guide bearing (4) comprises at least one outer surface (7) which is a peripheral surface arranged to cooperate in a complementary manner with a chamber (201, 202) or a bore comprised in said plate (101) or said bridge (102), at least in a plane perpendicular to said axis (D).

2. The display mechanism (100) according to claim 1, characterised in that each said holding element (6) is a leaf spring arranged to rest on the periphery of a said shaft (3).

3. The display mechanism (100) according to claim 1 or 2, characterised in that at least one said guide bearing (4) comprises a single said holding element (6).

4. The display mechanism (100) according to one of claims 1 to 3, characterised in that said guide device (1) comprises a plurality of said guide bearings (4) separated axially in the direction of said axis (D) and of which at least two have distinct said bisector planes (P).

5. The display mechanism (100) according to one of claims 1 to 4, characterised in that said at least one outer surface (7) is unique, and is a surface of revolution around said axis (D).

6. The display mechanism (100) according to one of claims 1 to 5, characterised in that said at least one outer surface (7) comprises at least one protruding or recessed relief (75) arranged to cooperate in a complementary manner with an indexing element comprised in said plate (101) or said bridge (102) for a single angular orientation of said guide bearing (4) carrying said at least one outer surface (7) with respect to said indexing element. M7. The display mechanism (100) according to one of claims 1 to 6, characterised in that said guide bearing (4) comprises at least one rigid peripheral part comprising at least one said outer surface (7).

8. The display mechanism (100) according to one of claims 1 to 6, characterised in that said guide bearing (4) comprises at least one elastic peripheral part comprising at least one said outer surface (7).

9. The display mechanism (100) according to claim 8, characterised in that said guide bearing (4) carrying said at least one outer surface (7) comprises at least one elastic blade (9) for elastically holding it in a chamber (201, 202) or a bore comprised in said plate (101) or said bridge (102) to receive a said guide bearing (4), and in that said first axial abutment surface (71) is arranged to limit the axial deformation of at least one said elastic blade (9) disposed in its immediate axial vicinity in the direction of said axis (D).

10. The display mechanism (100) according to claim 9, characterised in that said guide bearing (4) carrying said at least one elastic blade (9) comprises two sectors (701, 702) of the same cylinder for supporting it in a cylindrical chamber (201, 202) or a bore of said plate (101) or of said bridge (102), and in that said elastic blade (9) carries at its distal end a third cylindrical sector (703) identical to said two sectors (701, 702), to ensure perfect centring in said plate (101) or said bridge (102), well maintained by the elasticity of said blade (9).

11. The display mechanism (100) according to one of claims 1 to 10, characterised in that said guide bearing (4) is held to said plate (101) or to said bridge (102) by at least one pin (105) housed at the interface zone and ensuring the precise angular orientation of said guide bearing (4) with respect to said plate (101) or to said bridge (102).

12. The display mechanism (100) according to one of claims 1 to 11, characterised in that said at least one outer surface (7) comprises at least one first axial abutment surface (71) arranged to cooperate in axial abutment support, in the direction of said axis (D), with a support surface (1020, 1021) comprised in said plate (101) or said bridge (102) or a cabochon (103) arranged to be mounted in said plate (101) or said bridge (102).

13. The display mechanism (100) according to claim 12, characterised in that said at least one outer surface (7) further comprises a second axial abutment surface (72) arranged to cooperate in axial abutment support, in the direction of said axis (D), with a support surface comprised in said plate (101) or said bridge (102), on the side opposite that of said first axial abutment surface (71).

14. The display mechanism (100) according to claims 12 and 13, characterised in that at least one elastic blade (9) is interposed axially between said first axial abutment surface (71) and said second axial abutment surface (72).

15. The display mechanism (100) according to one of claims 1 to 14, characterised in that at least one said guide bearing (4) is made in one piece, and comprises, on the same component, both its said support surface (5) and all its said holding elements (6).

16. The display mechanism (100) according to claim 15, characterised in that at least one said guide bearing (4) is made of micro-machinable material.

17. The display mechanism (100) according to one of claims 1 to 16, characterised in that said display mechanism (100) comprises at least one said guide bearing (4) forming with said plate (101) or said bridge (102) an unremovable assembly.

18. The display mechanism (100) according to one of claims 1 to 17, characterised in that said display mechanism (100) comprises at least one said guide bearing (4) removable with respect to said plate (101) or said bridge (102).

19. A timepiece (1000) comprising at least one display mechanism (100) according to one of claims 1 to 18.

20. The timepiece (1000) according to claim 19, characterised in that it is a watch.