Display device comprising mechanism for coupling with watch movement

Abstract

To provide a display device in which a display can be easily indexed by a drive mechanism of a watch movement.SOLUTION: A display device 10 for a watch movement includes: a display 11 intended to be mounted movable relative to a structure 12 of the watch movement and provided with a member 110 for indexing relative to said structure 12, and with a driven wheel 111 whose rotation causes movement of the display 11; a drive mechanism 20 including a drive wheel 21 intended to drive the driven wheel 111 in rotation; and a coupling mechanism 30 including a transmission wheel 31 meshing with the driving wheel 21 and the driven wheel 111, the coupling mechanism 30 being configured so that the center of rotation of the transmission wheel 31 has a degree of mobility relative to the driving wheel 21 and the driven wheel 111.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the field of watch manufacturing, and more particularly to a wristwatch movement. The present invention relates more particularly to a display device including a mechanism for connecting to a wristwatch movement.

Background Art

[0002] In a wristwatch display mechanism for a wristwatch movement, the relative positioning of the display part with respect to a reference point such as another display part, an aperture, or another fixed structure is particularly important because it is a visible element. The problem of the relative positioning of the display part is always troublesome to solve because even the slightest deviation is clearly visible to the user. Since the correct position of the display part is an important element for ensuring quality, an incorrect position of the display part can greatly damage the image of the wristwatch brand.

[0003] Therefore, the display part generally needs to be very accurately determined with respect to a given reference point formed by the structure of the wristwatch movement or by another display part. However, this determination can cause difficulties during the assembly of the wristwatch movement and when integrating the display part into the kinematic chain of the wristwatch movement, particularly at the interface with the drive mechanism intended to transmit the energy of the wristwatch movement to the display part.

[0004] Specifically, due to machining tolerances, it can be cumbersome to obtain a determination that meets the required aesthetic quality standards.

[0005] An object of the present invention is to overcome this drawback by enabling the display part to be simply determined in the drive mechanism of the wristwatch movement.

Summary of the Invention

[0006] The present invention solves the above-mentioned drawbacks and, for that purpose, is a display device for a wristwatch movement, · A display unit intended to be movably attached to the structure of the wristwatch movement, the display unit being provided with a member for performing indexing with respect to the structure and a driven wheel that causes the movement of the display unit by rotation. · A drive mechanism including a drive wheel that rotationally drives the driven wheel. · A coupling mechanism including a transmission wheel that meshes with the drive wheel and the driven wheel, the coupling mechanism being configured such that the center of rotation of the transmission wheel has a certain degree of mobility with respect to the drive wheel and the driven wheel. Relates to a display device including the above.

[0007] In a specific embodiment, the present invention may further include one or more of the following features, considered separately or in any technically possible combination.

[0008] In a specific embodiment, the coupling mechanism includes a support body to which the transmission wheel is rotatably fastened, and the support body is configured to be in a rotatable state around the rotation axis of the drive wheel and in a stationary state held at a predetermined position by a blocking member.

[0009] In a specific embodiment, the transmission wheel forms a satellite of the driven wheel, and the drive wheel is formed by an internal gear-containing ring gear.

[0010] In a specific embodiment, the drive wheel and the driven wheel are arranged coaxially.

[0011] In a specific embodiment, the support body has two radial arms, one of which carries the transmission wheel and the other of which is held by being clamped in a notch in the structure of the wristwatch movement by a blocking member when the support body is in a stationary state.

[0012] In a specific embodiment, one of these arms includes an adjustment member, and the operation of this adjustment member allows the support body to be moved when the support body is in a movable state.

[0013] In a particular embodiment, the free end of the arm carrying the transmission movable part has an adjusting member. This adjusting member is preferably formed by a notch.

[0014] In a particular embodiment, the display part is a rotatable roller, including a roller formed by two lateral flanges. Between the two lateral flanges, a plurality of flaps that are each rotatable along an axis parallel to the rotation axis of the roller are interposed. One of these flanges is kinematically connected to the driven hole, and the rotation axes of the driving wheel and the driven wheel coincide with the rotation axis of the roller.

[0015] According to another object, the present invention also relates to a wristwatch movement including a structure and the display device described above.

Brief Description of the Drawings

[0016] Other features and advantages of the present invention will become apparent by reading the following detailed description given as a non-limiting example with reference to the accompanying drawings.

[0017]

Figure 1

Figure 2

Figure 3

[0018] It should be noted that the drawings are not necessarily drawn to scale for the purpose of clarity.

Modes for Carrying Out the Invention

[0019] The present invention relates to a display device 10 for a watch movement, the display device 10 including a display part 11 intended to be movably attached to a structure 12 of the watch movement, such as a plate or a bridge, and a drive mechanism 20 intended to receive energy from a drive member of the movement in order to move the display part 11. The display device 10 also includes a connecting mechanism 30 configured to kinematically connect the display part 11 and the drive mechanism 20.

[0020] As shown in the exploded views of FIGS. 1 to 3, the display part 11 includes an indexing member 110 that forces the correct orientation of the display part 11 with respect to the structure 12. The display part 11 also includes a driven wheel 111 whose rotation causes the movement of the display part 11. The driven wheel 111 is intended to be rotationally driven by the drive mechanism 20, specifically the drive wheel 21 of the drive mechanism 20, via a transmission wheel 31 of the connecting mechanism 30.

[0021] The connecting mechanism 30 is preferably configured such that the center of rotation of the transmission wheel 31 has a certain degree of mobility with respect to the drive wheel 21 and the driven wheel 111.

[0022] Advantageously, this function makes it possible to adjust the position of the transmission wheel 31 with respect to the drive wheel 21 and the driven wheel 111 and enables the correct indexing of the display elements.

[0023] In a preferred embodiment of the invention shown in FIGS. 1 to 3, the display part 11 includes a roller formed by two lateral flanges 112 rotatably attached to a drive shaft 22, and between the two lateral flanges 112, a plurality of flaps 113 rotatable respectively along an axis parallel to the axis of these flanges 112 are interposed. Such a roller is described, for example, in European Patent Application Publication No. 3627240.

[0024] As shown in FIGS. 1 to 3, the driven wheel 111 is arranged on the drive shaft 22 so as to rotate freely and is kinematically connected to one of these flanges 112. As a result, the rotation of the driven wheel 111 causes the rotation of the flange 112 and thus the rotation of the roller. Specifically, the driven wheel 111 is fastened to the flange 112 without degrees of freedom.

[0025] The indexing member 110 cooperates with the periphery of one of these flanges 112 in order to index the position of the display unit 11. Specifically, in a preferred embodiment of the present invention, the flange 112 includes a plurality of radial notches 114, and each of the plurality of radial notches 114 corresponds to a position of the display unit 11. The indexing member 110 includes fingers 115 configured to adopt an indexing position engaging with the notches 114 of the flange 112 and a retracted position disengaged from the notches 114. The fingers 115 are driven between the indexing position and the retracted position by a control shaft 116 to which the fingers 115 are fixed. This control shaft 116 is moved once a day, for example, when the display unit 11 is a date display unit, according to a predetermined frequency.

[0026] Alternatively, the indexing member 110 may passively index the display unit 11 by elastic deformation, for example, like a neck chain.

[0027] The drive wheel 21 is rotationally driven by a drive shaft 22 to which the drive wheel 21 is fastened without degrees of freedom. Preferably, the drive wheel 21 is formed by a ring gear including internal teeth connected to the rim, as shown in FIG. 1. That is, the drive wheel 21 and the driven wheel 111 are coaxial and their rotation axes coincide.

[0028] In this configuration, the transmission wheel 31 forms a satellite of the driven wheel 111 that forms a sun wheel.

[0029] As shown in FIGS. 1 to 3, the connecting mechanism 30 includes a support 32 to which a drive wheel 31 is rotatably fastened. Advantageously, the support 32 is configured to be rotatable about the axis of rotation of the drive wheel 21 and to be held in a stationary state relative to the structure 12 at a predetermined position by a blocking member 33.

[0030] Specifically, the support 32 has two radial arms, of which the first arm 320 carries the transmission wheel 31, and the second arm 321 is intended to be held by being clamped in a notch 120 of the structure 12 by the blocking member 33 when the support 32 is in the stationary state. Such a blocking member 33 may advantageously be a screw designed to engage the structure 12 according to a screw connection, as shown in the figure. That is, once properly oriented, i.e., when the transmission wheel 31 meshes with the drive wheel 21 and the driven wheel 111, the support 32 can be clamped to the structure 12 by the screw.

[0031] The orientation of the support 32 may be performed, in a preferred embodiment of the present invention, by operating an adjustment member 322 of the support 32 formed by the free end of the first arm 320. Specifically, the adjustment member 322 of the support 32 may be formed by a notch intended to receive the blade of a tool such as a screwdriver.

[0032] In general, it should be noted that the implementation examples and modes of embodiments considered in this specification are described as non-limiting examples, and other variations are consequently conceivable.

Claims

1. A display device (10) for a watch movement, comprising: a display part (11) intended to be movably mounted with respect to a structure (12) of said watch movement, said display part (11) being provided with a member (110) for indexing with respect to said structure (12) and with a driven wheel (111) whose rotation causes a movement of said display part (11); a drive mechanism (20) including a drive wheel (21) intended to drive in rotation said driven wheel (111); a coupling mechanism (30) including a transmission wheel (31) meshing with the driving wheel (21) and the driven wheel (111), the coupling mechanism (30) being configured such that the center of rotation of the transmission wheel (31) has a certain degree of mobility relative to the driving wheel (21) and the driven wheel (111); A display device (10).

2. The display device (10) of claim 1, wherein the connecting mechanism (30) includes a support (32) to which the transmission wheel (31) is fastened so as to be rotatable, and the support (32) is configured to be rotatable around the rotation axis of the drive wheel (21) and to be stationary in which it is held in a predetermined position by a blocking member (33).

3. 3. A display device (10) according to claim 2, wherein the transmission wheel (31) forms a satellite of the driven wheel (111), the driving wheel (21) being formed by a ring gear including internal teeth.

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

5. 3. The display device (10) of claim 2, wherein 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 being clamped in a notch in the structure (12) of the watch movement by the blocking member (33) when the support (32) is in the stationary state.

6. 6. The display device (10) of claim 5, wherein one of the arms (320) includes an adjustment member (322) whose actuation allows movement of the support (32) when the support (32) is in the movable state.

7. 7. A display device (10) according to claim 6, wherein the free end of the arm (320) carrying the transmission wheel has the adjustment member (322) formed by a notch.

8. 3. The display device (10) of claim 2, wherein the display portion (11) comprises a rotatable roller formed by two lateral flanges (112) between which are interposed a number of flaps (113) each rotatable along an axis parallel to the axis of the roller, one of the flanges (112) 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 comprising a structure (12) and a display device (10) according to claim 1.

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