Mechanism for a timepiece

Abstract

The invention relates to a mechanism (100) for a timepiece, comprising: a first minute wheel (1); a second minute wheel (2); -a gear connection (14, 15, 21) between the first cannon pinion (1) and the second cannon pinion (2); and means (16) for compensating for the clearance in the gear connection. A gear connection (14, 15, 21) between a first minute wheel (1) and a second minute wheel (2) comprises:-a first gear (15) attached to the first minute wheel (1); -a second gear (14) pivotally mounted relative to the first minute wheel; and-a third gear (21) attached to the second cannon pinion (2) wherein the first and second gears mesh with the third gear, a backlash compensation device (16) in the gear connection being arranged to exert a return force from the first and second gear pairs in:-two opposite faces of at least one tooth of the third gear (21); and / or-adjacent faces of at least two consecutive teeth of the third gear (21).

Description

Technical Field

[0001] The invention relates to a mechanism for a timepiece movement. The invention also relates to a timepiece movement comprising such a mechanism. The invention finally relates to a timepiece comprising such a mechanism and / or such a movement. Background Art

[0002] The striking mechanism of a clock is very complex. It is complicated due to the number and nature of the kinematic connections between its parts.

[0003] Usually, in a striking mechanism, and in particular in a classic repeating striking mechanism, the minute snail (i.e. a cam with a notch for adjusting the minute striking mechanism, which cam cooperates with the contact of the minute piece) is fixed directly to the minute wheel carrying the minute hand at its end. This arrangement ensures a mechanism without offsets between the position of the minute hand relative to the minute scale of the dial and the number of minute strikes. The same applies to the quarter-hour snail, which is a cam with a notch for adjusting the quarter-hour striking mechanism, which cam cooperates with the contact of the quarter-hour piece.

[0004] This construction presents the problem of mounting and positioning the snail to ensure that the strikes are perfectly synchronized with the position of the hand.

[0005] Invention Introduction

[0006] The object of the present invention is to provide a mechanism that overcomes the above-mentioned disadvantages and improves the known mechanisms in the prior art. In particular, the present invention proposes a simple mechanism that makes it easier to assemble the cam of the striking mechanism and synchronize the striking mechanism with the timepiece display. Summary of the invention

[0007] A first aspect of the invention relates to a mechanism as defined in claim 1 .

[0008] According to a first aspect of the invention, embodiments of the mechanism are defined in claims 2 to 6 .

[0009] According to a first aspect of the invention, a timepiece movement is defined by claim 7 .

[0010] According to the first aspect of the invention, an embodiment of the movement is defined by claim 8 .

[0011] According to a first aspect of the invention, a timepiece is defined as in claim 9 .

[0012] According to a second aspect of the invention, the subject matter is defined by the following proposals:

[0013] 1. A mechanism (100) for a striking watch movement (200), comprising:

[0014] - first sub-wheel (1),

[0015] - the second sub-wheel (2),

[0016] - a gear connection (14, 15, 21) between the first minute wheel (1) and the second minute wheel (2), and

[0017] - Means (16) for compensating for play in the gear connection.

[0018] 2. The mechanism (100) according to proposal 1, wherein the gear connection (14, 15, 21) between the first minute wheel (1) and the second minute wheel (2) comprises:

[0019] - a first wheel (15) fixed to the first minute wheel (1),

[0020] - a second wheel (14) pivotally mounted relative to the first cannon pinion, and

[0021] - a third wheel (21) fixed to the second wheel (2),

[0022] The first and second wheels mesh with the third wheel, and

[0023] The device (16) for compensating for play in the gear connection is arranged to apply a return force that returns the first wheel and the second wheel against the following sides:

[0024] - the opposite side of at least one tooth of the third wheel (21), and / or

[0025] - adjacent flanks of at least two consecutive teeth of the third wheel (21).

[0026] 3. A mechanism (100) according to proposal 2, wherein the clearance compensation device (16) comprises an adjustment element (131) for adjusting the return force, the adjustment element (131) comprising, for example, a clampable recess (131) allowing the second gear (14) to rotate relative to the first pinion wheel (1).

[0027] 4. A mechanism (100) according to any one of claims 1 to 3, wherein the clearance compensation device (16) comprises a spring (16), in particular a leaf spring (16), which is fixed in the following manner:

[0028] - firstly, in particular at one of its ends, fixed to the first cannon pinion (1), and

[0029] - Secondly, it is fixed, in particular at its other end, to the second wheel (14).

[0030] 5. The mechanism (100) according to proposals 2 and 4, wherein the spring (16) is fixed in the following manner:

[0031] - is fixed at one of its ends to the second wheel (14) using a pin (163), and

[0032] At its other end it is fixed to the first cannon pinion ( 1 ) via a ring ( 161 ) belonging to the spring ( 16 ).

[0033] 6. Mechanism (100) according to any one of proposals 1 to 5, wherein the first minute wheel (1) is intended to house a first minute indicator, such as a minute hand (61).

[0034] 7. Mechanism (100) according to any one of proposals 1 to 6, in which the second minute wheel (2) is intended to accommodate at least one striking device cam (22, 23, 24), in particular a minute snail (22) and / or a safety return device (23) and / or a quarter-hour snail (24).

[0035] 8. A watch movement (200), comprising:

[0036] - an institution (100) according to any one of proposals 1 to 7, and

[0037] A finishing gear (99) driving one of the first minute wheel (1) and the second minute wheel (2).

[0038] 9. A timepiece movement (200) according to proposal 8, wherein the movement comprises a frame (90), in particular a main plate (91), wherein the first minute wheel (1) is mounted on the dial side of the frame, and the second minute wheel (2) is mounted on the bridge side of the frame.

[0039] 10. A watch (300), in particular a time-telling watch (300), comprising:

[0040] - an institution (100) according to any one of proposals 1 to 7, and / or

[0041] - A timepiece movement (200) according to any one of proposals 8 and 9. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The subject matter, features and advantages of the present invention are set forth in detail in the following description of certain non-limiting embodiments given with respect to the accompanying drawings.

[0043] Figure 1 is a partial cross-sectional view of one embodiment of a timepiece according to the present invention.

[0044] Figure 2 It is a schematic cross-sectional perspective view of an embodiment of a timepiece.

[0045] Figure 3 It is a schematic perspective view of an embodiment of a timepiece.

[0046] Figure 4It is a perspective view of a part of an embodiment of a timepiece. DETAILED DESCRIPTION

[0047] Refer to the following Figures 1 to 4 An embodiment of a timepiece 300 is described in detail. The timepiece 300 is, for example, a watch, in particular a wristwatch and / or a timepiece, having a time-telling function. The timepiece 300 comprises a time-telling watch movement 200, which is intended to be mounted in a watchcase or housing of the timepiece so as to protect it from the external environment. The watch movement 200 may be a mechanical movement, in particular an automatic movement.

[0048] The watch movement 200 comprises:

[0049] - a frame 90, in particular a blank or main plate 91,

[0050] - a first wheel mobile 19,

[0051] - a second wheel mobile 29,

[0052] - A finishing gear 99 that drives one of the first cannon-pinion mobile and the second cannon-pinion mobile.

[0053] The first wheel-centre mobile 19 comprises the first wheel-centre 1. The first wheel-centre mobile, in particular the first wheel-centre 1, can pivot on the frame 90, in particular on the first pivot 18, which is mounted (in particular driven) in the frame 90, for example, via its end 93. The first pivot 18 can be a central tube. The first wheel-centre mobile 19 comprises various elements 11, 12, 13, 14, 15, 16, 17 mounted on the first wheel-centre 1. The first wheel-centre mobile 19 is advantageously mounted on the dial side of the frame 90.

[0054] The second wheel-pinion mobile 29 comprises the second wheel-pinion 2. The second wheel-pinion mobile, in particular the second wheel-pinion 2, can pivot on the frame 90, in particular on the second pivot 28, which is mounted (in particular driven) in the frame 90, for example, via its end 92. The second wheel-pinion mobile 29 can comprise various elements 21, 22, 23, 24 mounted on the second wheel-pinion 2. The second wheel-pinion mobile 29 is advantageously mounted on the splint side of the frame 90.

[0055] In other words, the timepiece movement 200 comprises a mechanism 100 comprising:

[0056] - a first cannon-pinion 1 or a first cannon-pinion mobile 19, and

[0057] The second cannon-pinion 2 or the second cannon-pinion mobile 29 .

[0058] The organization 100 also includes:

[0059] a gear connection 14, 15, 21 between the first minute wheel 1 and the second minute wheel 2, in particular a connection via a direct gear transmission (or a gear transmission without an intermediate wheel), and

[0060] - Means 16 for compensating for play in the gear connection.

[0061] As shown, the first cannon-pinion mobile 19 is advantageously mounted on a pivot 18 which is driven into the frame 90 and defines a first axis A1 of rotation of the first cannon-pinion mobile 19 relative to the frame 90 .

[0062] The first wheel mobile 19 preferably comprises:

[0063] - First round 1,

[0064] - a first cannon wheel 11 mounted as a friction fit on cannon wheel 1 and arranged to mesh with finishing wheel 99 (as with hour wheel 17 removed) Figure 4 as shown) or forming part of a finishing gear 99,

[0065] a cannon pinion 12 which is integral with the first cannon pinion 1 or is fixed (in particular driven) to the first cannon pinion 1, this pinion 12 being arranged to mesh with the minute wheel 98 of the minute mobile (such as with the hour wheel 17 removed) Figure 4 shown),

[0066] a second gear wheel 14 mounted so as to be rotatable on the first cannon pinion 1 about the axis A1, the second gear wheel 14 comprising a tooth set 141 and a plate 13, the tooth set 141 being arranged to mesh with the gear wheel 21 of the second cannon pinion,

[0067] a third gear wheel 15 which is integral with the first cannon pinion 1 or is fixed (in particular driven) to the first cannon pinion 1 , this wheel 15 being arranged to mesh with the wheel 21 of the second cannon pinion 2 ,

[0068] an hour wheel 17 mounted so as to be rotatable about axis A1 on first cannon-pinion 1 , hour wheel 17 being arranged to mesh with minute pinion 97 of the minute mobile,

[0069] - an hour hand 62 which is fixed (in particular driven) to the hour wheel, and

[0070] A minute hand 61 which is fastened (in particular driven) to the first minute wheel 1 .

[0071] The second minute wheel mobile 29 preferably includes:

[0072] - Second round 2,

[0073] A fourth toothed wheel 21 , which is integral with the second cannon pinion 1 or is fixed (in particular driven) to the second cannon pinion 2 , this wheel 21 being arranged to mesh with the above-mentioned wheels 14 and 15 .

[0074] Preferably, the gear connecting members 14, 15, 21 between the first minute wheel 1 and the second minute wheel 2 include:

[0075] - a third gear 15 fixed to the first wheel 1,

[0076] a second gear wheel 14 pivotally mounted relative to the first cannon pinion 1 , and

[0077] A fourth gear wheel 21 fixed to the second wheel pinion 2 .

[0078] The second gear 14 and the third gear 15 mesh with the fourth wheel 21 .

[0079] Preferably, the means 16 for compensating for play in the gear connection are arranged to exert a return force that returns the second wheel 14 and the third wheel 15 against the following sides:

[0080] - two opposite sides of at least one tooth of the fourth wheel 21, and / or

[0081] - the adjacent flanks of at least two consecutive teeth of the fourth wheel 21 .

[0082] Advantageously, the clearance compensation device 16 can include a spring 16, in particular a leaf spring 16, which is fixed in the following manner:

[0083] - firstly, in particular at one of its ends, to the first cannon pinion 1 , and

[0084] - Secondly, it is fixed, in particular at its other end, to the second wheel 14 .

[0085] More specifically, the spring 16 may be fixed at its first end to the second wheel 14 using a pin 163 .

[0086] Furthermore, the spring 16 can be fixed at its second end to the first cannon pinion via a ring 161 driven on the cannon pinion.

[0087] The clearance compensation device 16 comprises an element 131 for adjusting the return force. To this end, the plate 13 may have a set of notches 131 for rotating the second wheel 14 relative to the first cannon pinion. This set of notches can be manipulated using a tool. The manipulation may be in one direction or the other around the axis A1. Once the spring 16 is deformed to obtain the desired return force strength:

[0088] - a second gear 14 and a third gear 15 on the one hand, and

[0089] - the fourth gear 21 on the other hand,

[0090] is placed in meshing with a preload. Thus, the second wheel is in meshing contact with the fourth wheel, and then the third wheel is in meshing contact with the fourth wheel. Thus, the tooth set is preloaded. It should be noted that the return force needs to be set to a value that is just sufficient to avoid any play between the first and second cannon cannon relative to each other under normal conditions of use of the timepiece. In particular, a high return force leads to a loss of energy and therefore to a loss of energy autonomy of the timepiece.

[0091] In the above-mentioned embodiment, an angular return element is used, which returns the two tooth sets relative to each other so as to achieve gapless meshing. However, as a variant, other ways of achieving gapless meshing can be adopted. In particular, a tooth set with flexible teeth, in particular a tooth set whose teeth are split in the height direction thereof, can be used on the first minute wheel and / or the second minute wheel.

[0092] In the above-mentioned embodiment, the clearance compensation device 16 (ie, the preloading device) is arranged on the first minute wheel. As an alternative, in any embodiment or variation, the clearance compensation device 16 can be arranged on the second minute wheel.

[0093] In any embodiment or variant, the transmission ratio of the transmission connecting the first minute wheel and the second minute wheel is advantageously 1.

[0094] In any embodiment or variant, the second cannon pinion may carry only one snail.

[0095] In the above embodiment, the finishing gear drives the first minute wheel, and the first minute wheel itself drives the second minute wheel. As an alternative, in any embodiment or variation, the finishing gear can drive the second minute wheel, and the second minute wheel itself drives the first minute wheel.

[0096] By means of the present invention, it is possible to install:

[0097] - a time indication hand around a first axis A1, and

[0098] - one or more striking mechanism cams around the second axis A2,

[0099] The first axis and the second axis:

[0100] - are different and / or distant from each other, and

[0101] - Parallel (as in the depicted embodiment) or non-parallel.

[0102] This solution provides a great deal of constructional flexibility as to how the various devices of the timepiece may be positioned at different locations in the timepiece movement.

[0103] Thanks to the invention, it is also possible to install the first minute wheel on one side of the watch movement and the second minute wheel on the other side of the movement. This makes it easy to install and set the watch movement.

[0104] The first and second cannon pinion are mounted so that they mesh directly with each other, i.e. without an intermediate wheel. Therefore, the tolerance accumulation of the positioning of the first and second cannon pinion relative to each other is very small. In addition, the described solution compensates for any gap that may exist between the first and second cannon pinion. Therefore, by means of the described solution, the first and second cannon pinion can be finely synchronized in terms of rotation around their respective axes A1, A2.

Claims

1. A mechanism (100) for a striking watch movement (200), comprising: - first sub-wheel (1), - the second sub-wheel (2), - a gear connection (14, 15, 21) between the first minute wheel (1) and the second minute wheel (2), and - means (16) for compensating for play in the gear connection, The gear connecting member (14, 15, 21) between the first minute wheel (1) and the second minute wheel (2) comprises: - a first wheel (15) fixed to the first cannon pinion (1), - a second wheel (14) pivotally mounted relative to said first cannon pinion, and - a third wheel (21) fixed to the second wheel (2), The first wheel and the second wheel are meshed with the third wheel, and The device (16) for compensating for play in the gear connection is arranged to apply a return force that returns the first wheel and the second wheel against: - opposite sides of at least one tooth of the third wheel (21), and / or - adjacent flanks of at least two consecutive teeth of said third wheel (21).

2. A mechanism (100) according to claim 1, wherein the clearance compensation device (16) includes an adjustment element (131) for adjusting the return force, the adjustment element (131) including, for example, a clampable recess (131) allowing the second gear (14) to rotate relative to the first minute wheel (1).

3. The mechanism (100) according to any one of the preceding claims, wherein the clearance compensation device (16) comprises a spring (16), in particular a leaf spring (16), which is fixed in the following manner: - firstly, fastened to said first cannon pinion (1), in particular at one of its ends, and - Secondly, it is fixed, in particular at its other end, to the second wheel (14).

4. The mechanism (100) according to the preceding claim, wherein the spring (16) is fixed in the following manner: - is fixed at one of its ends to the second wheel (14) using a pin (163), and At its other end, it is fixed to the first cannon pinion ( 1 ) via a ring ( 161 ) belonging to the spring ( 16 ).

5. Mechanism (100) according to any one of the preceding claims, wherein the first minute wheel (1) is intended to receive a first minute indicator, such as a minute hand (61).

6. Mechanism (100) according to any of the preceding claims, wherein the second minute wheel (2) is intended to receive at least one striking device cam (22, 23, 24), in particular a minute snail (22) and / or a safety return device (23) and / or a quarter-hour snail (24).

7. A watch movement (200), comprising: - a mechanism (100) according to any one of the preceding claims, and A finishing gear (99) driving one of the first minute wheel (1) and the second minute wheel (2).

8. A watch movement (200) according to the preceding claim, wherein the movement comprises a frame (90), in particular a main plate (91), wherein the first minute wheel (1) is mounted on the dial side of the frame and the second minute wheel (2) is mounted on the plate side of the frame.

9. A timepiece (300), in particular a time-telling watch (300), comprising: - a mechanism (100) according to any one of claims 1 to 6, and / or - A timepiece movement (200) according to any one of Claims 7 and 8.

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