Display device comprising coupling mechanism for coupling to watch movement

Abstract

The invention relates to a display device (10) for a watch movement, characterized in that it comprises a display (11), a drive mechanism (20) and a coupling mechanism (30); the display (11) is intended to be mounted so as to be movable relative to a structure (12) of a watch movement and is provided with a driven wheel (111) and an indexing positioning member (110) for indexing positioning relative to said structure (12), the rotation of the driven wheel (111) causing the movement of the display (11); the driving mechanism (20) comprises a driving wheel (21) intended to drive the driven wheel (111) in rotation; the coupling mechanism (30) comprises a transmission wheel (31) meshed with the driving wheel (21) and the driven wheel (111), and the coupling mechanism (30) is configured to enable the rotation center of the transmission wheel (31) to have certain motion relative to the driving wheel (21) and the driven wheel (111).

Description

Technical Field

[0001] The present invention relates to the field of watch manufacturing, in particular to watch movements. The present invention particularly relates to a display device comprising a coupling mechanism for coupling to a watch movement. Background Art

[0002] In watch display mechanisms for watch movements, the relative positioning of a display with respect to a reference point (e.g. another display, an aperture or another fixed structure) is particularly important since it is a visible element. The problem of relative positioning of displays is always difficult to solve, since any misalignment, no matter how slight, is very noticeable to the user. Since the correct positioning of the display is an important guarantee of quality, incorrect positioning of the display can be extremely damaging to the image of a watch brand.

[0003] Therefore, the display must be indexed very precisely with respect to a given reference point, which is generally formed by the structure of the watch movement or by another display. However, such indexed positioning may make it difficult to integrate the display in the kinematic chain of the watch movement during assembly of the watch movement, in particular at the interface with the drive mechanism for transmitting the energy of the watch movement to the display.

[0004] More specifically, obtaining indexing that meets the required aesthetic quality standards can be tricky due to machining tolerances. Summary of the invention

[0005] One object of the present invention is to overcome this drawback by enabling the display to be easily indexed to the drive mechanism of a watch movement.

[0006] The present invention solves the above-mentioned disadvantages and relates to a display device for a watch movement, the display device comprising:

[0007] - a display intended to be mounted so as to be movable relative to the structure of said watch movement and provided with a driven wheel and with indexing means for indexing relative to said structure, the rotation of said driven wheel causing the movement of said display;

[0008] - a drive mechanism comprising a drive wheel intended to drive in rotation said driven wheel;

[0009] - a coupling mechanism comprising a transmission wheel meshing with the driving wheel and the driven wheel, the coupling mechanism being configured so that a rotation center of the transmission wheel has a certain degree of mobility relative to the driving wheel and the driven wheel.

[0010] In a particular embodiment, the invention may also include one or more of the following features, which may be considered individually or in any technically feasible combination.

[0011] In a particular embodiment, the coupling mechanism comprises a support to which the transmission wheel is rotationally fastened, the support being configured to be in a moving state rotationally movable about the rotation axis of the drive wheel and in a stationary state held in place by a blocking member.

[0012] In a particular embodiment, the transmission wheel forms a satellite wheel of the driven wheel, the driving wheel being formed by a ring gear comprising an internal toothing.

[0013] In a particular embodiment, the driving wheel is arranged coaxially with the driven wheel.

[0014] In a particular embodiment, the support has two radial arms, one of which carries the transmission wheel and the other of which is retained by the blocking member by clamping in a notch of the structure of the watch movement when the support is in the rest state.

[0015] In a particular embodiment, one of the two radial arms comprises an adjustment member allowing the support to be moved by actuating the adjustment member when the support is in the state of movement.

[0016] In a particular embodiment, the free end of the radial arm carrying the transmission wheel has the adjustment member. The adjustment member is preferably formed by a notch.

[0017] In a specific embodiment, the display includes a roller capable of rotatable movement, the roller being formed by two lateral flanges, a plurality of flaps being inserted between the two lateral flanges, the plurality of flaps being capable of rotatable movement respectively around axes parallel to the axis of the roller, one of the lateral flanges being kinematically connected to the driven wheel, the rotation axis of the driving wheel and the driven wheel coinciding with the rotation axis of the roller.

[0018] According to another object, the invention also relates to a watch movement comprising a structure and a display device as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other characteristics and advantages of the invention will become apparent on reading the following detailed description given by way of non-limiting example with reference to the accompanying drawings, in which:

[0020] Figure 1 and Figure 2 An exploded perspective view showing a display device of a watch movement according to a preferred embodiment of the present invention;

[0021] Figure 3 Shows Figure 1 A perspective view of a display device.

[0022] It should be noted that for the sake of clarity, the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0023] The present invention relates to a display device 10 for a watch movement, comprising a display 11, intended to be mounted so as to be movable relative to a structure 12 (e.g. a plate or a bridge) of the watch movement, and a drive mechanism 20, intended to receive energy from a drive member of the movement to move the display 11. The display device 10 also comprises a coupling mechanism 30, which is configured to kinematically connect the display 11 to the drive mechanism 20.

[0024] like Figures 1 to 3 As shown in the exploded view of FIG. 1 , the display 11 includes a graduated positioning member 110, which allows the display 11 to be accurately oriented relative to the structure 12. The display 11 also includes a driven wheel 111, the rotation of which causes the movement of the display 11. The driven wheel 111 is intended to be driven in rotation by the drive mechanism 20, in particular by the drive wheel 21 of the drive mechanism 20 via the transmission wheel 31 of the coupling mechanism 30.

[0025] The coupling mechanism 30 is advantageously configured such that the rotation center of the transmission wheel 31 has a certain degree of mobility relative to the driving wheel 21 and the driven wheel 111 .

[0026] Advantageously, this feature allows the position of the transmission wheel 31 to be adjusted relative to the drive wheel 21 and the driven wheel 111 so that the display element can be correctly indexed and positioned.

[0027] exist Figures 1 to 3 In the preferred embodiment of the invention shown, the display 11 comprises a roller formed by two lateral flanges 112, which are mounted on the drive shaft 22 in a rotatable manner, and between which a plurality of flaps 113 are inserted, which can respectively rotate about axes parallel to the axes of the lateral flanges 112. Such a roller is described, for example, in patent EP3627240.

[0028] like Figures 1 to 3 As shown, the driven wheel 111 is arranged on the drive shaft 22 in a freely rotatable manner and is kinematically connected to one of the lateral flanges 112, so that the rotation of the driven wheel 111 causes the rotation of the lateral flange 112, thereby causing the rotation of the roller. Specifically, the driven wheel 111 is fastened to the lateral flange 112 without any degree of freedom.

[0029] The indexing member 110 cooperates with the periphery of one of the lateral flanges 112 so as to index the position of the display 11. Specifically, in a preferred embodiment of the present invention, the lateral flange 112 comprises a plurality of radial notches 114, each of which corresponds to a position of the display 11. The indexing member 110 comprises a finger 115 configured to occupy an indexing position and a retracted position, in which the finger 115 engages with the radial notches 114 of the lateral flange 112, and in which the finger 115 disengages from the radial notches 114. The finger 115 is driven between the indexing position and the retracted position by a control shaft 116 to which it is fixed, and the control shaft 116 moves at a predetermined frequency, for example, once a day if the display 11 is a date display.

[0030] Alternatively, the indexing member 110 may passively index the display 11, such as by elastic deformation, like a necklace.

[0031] The drive wheel 21 is driven to rotate by a drive shaft 22, on which the drive wheel 21 is fastened without any degree of freedom. Preferably, the drive wheel 21 is formed by a ring gear comprising an inner toothed portion connected to the rim, such as Figure 1 Therefore, the driving wheel 21 and the driven wheel 111 are coaxial, and their rotation axes coincide.

[0032] In this configuration, the transmission wheel 31 forms a satellite wheel of the driven wheel 111 , while the driven wheel 111 forms a sun wheel.

[0033] like Figures 1 to 3 As shown, the coupling mechanism 30 comprises a support 32 on which the transmission wheel 31 is rotatably fastened. Advantageously, the support 32 is configured to be in a moving state capable of rotational movement around the rotation axis of the drive wheel 21 and a stationary state intended to be held in place relative to the structure 12 by a blocking member 33.

[0034] In particular, the support 32 has two radial arms, a first radial arm 320 of which carries the transmission wheel 31 and a second radial arm 321 of which is intended to be held in the recess 120 of the structure 12 by means of a blocking member 33 when the support 32 is at rest. This blocking member 33 can advantageously be a screw designed to engage in the structure 12 by means of a screw connection, as shown in the figures. Thus, once it is correctly oriented, i.e., so that the transmission wheel 31 is meshed with the drive wheel 21 and the driven wheel 111, the support 32 can be clamped against the structure 12 by means of the screw.

[0035] The orientation of the support 32 can be accomplished by manipulating the adjustment member 322 of the support 32, which in a preferred embodiment of the invention is formed by the free end of the first radial arm 320. More specifically, the adjustment member 322 of the support 32 can be formed by a recess intended to receive a blade of a tool, such as a screwdriver.

[0036] More generally, it should be noted that the embodiments and examples considered above are non-limiting examples and other variants can therefore be envisaged.

Claims

1. A display device (10) for a watch movement, characterized in that: The display device (10) comprises: a display (11) intended to be mounted so as to be movable relative to a structure (12) of the watch movement and provided with a driven wheel (111) and a graduated positioning member (110) for graduated positioning relative to the structure (12), the rotation of the driven wheel causing the movement of the display (11); a driving mechanism (20), the driving mechanism (20) comprising a driving wheel (21) for driving the driven wheel (111) to rotate; A coupling mechanism (30) comprises a transmission wheel (31) meshing with the driving wheel (21) and the driven wheel (111), wherein the coupling mechanism (30) is configured so that the rotation center of the transmission wheel (31) has a certain degree of mobility relative to the driving wheel (21) and the driven wheel (111).

2. The display device (10) according to claim 1, characterized in that: The coupling mechanism (30) comprises a support (32) on which the transmission wheel (31) is fastened in a rotatable manner, and the support (32) is configured to be in a moving state capable of rotatable movement around the rotation axis of the drive wheel (21) and a stationary state held in place by a blocking member (33).

3. The display device (10) according to claim 2, characterized in that: The transmission wheel (31) forms a satellite wheel of the driven wheel (111), and the driving wheel (21) is formed by a ring gear including an internal tooth portion.

4. The display device (10) according to claim 3, characterized in that: The driving wheel (21) and the driven wheel (111) are arranged coaxially.

5. The display device (10) according to claim 2, characterized in that: The support (32) has two radial arms (320, 321), one of which carries the transmission wheel (31) and the other of which is held by the blocking member (33) in a recess of the structure (12) of the watch movement by clamping when the support (32) is in the stationary state.

6. The display device (10) according to claim 5, characterized in that One of the two radial arms comprises an adjustment member (322) which allows the support (32) to be moved by actuating the adjustment member when the support (32) is in the moving state.

7. The display device (10) according to claim 6, characterized in that The free end of the radial arm carrying the transmission wheel has the adjustment member (322), which is formed by a notch.

8. The display device (10) according to claim 2, characterized in that The display (11) includes a rotatable roller, the roller being formed by two lateral flanges (112), between which a plurality of flaps (113) are inserted, the plurality of flaps (113) being capable of rotatable movement around axes parallel to the axis of the roller, one of the lateral flanges being kinematically connected to the driven wheel (111), the rotation axes of the driving wheel (21) and the driven wheel (111) coinciding with the rotation axis of the roller.

9. A watch movement, characterized in that: The watch movement comprises a structure (12) and a display device (10) according to any one of claims 1 to 8.

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