CH719696A2 - Watch mechanism for watch. - Google Patents

Abstract

The invention relates to a watch mechanism for a chronograph watch comprising: - a current time mobile (7), comprising an axis and being arranged to rotate around this axis, - a first mobile (1), comprising a first axis (10 ) and being arranged to be connected to the current time mobile (7), – an indicator member, – a second mobile (2), arranged to mesh with the first mobile (1), and to be connected to said indicator member, – a element carrying a scale comprising a set of indications, said indicator member making it possible to display information on this scale. The mobiles (1,2) are arranged so as to obtain a gear ratio between the mobiles (1,2) which varies according to their relative angular position, so that the indicator member rotates with a speed of variable rotation in correspondence of at least one subset of said set of indications.

Description

Technical area

The present invention relates to a watch mechanism for a watch, in particular a mechanism which allows an indicator member to rotate with a variable rotation speed.

State of the art

[0002] A watch in general comprises a kinematic chain linking a source of energy, for example and in a non-limiting manner a barrel, to one for several mobiles of current time, which are connected, directly or indirectly (for example via one or several intermediate mobiles) to one or more indicator members of the watch (such as for example and not limited to hands), in order to display the current hour, minutes and/or seconds. The mobiles of current time are therefore arranged to rotate permanently, with a constant speed of rotation.

[0003] A chronograph watch is a time device which allows a duration measurement to be carried out. As a general rule, it includes at least one indicator member which can be started and then stopped, by means of a pusher or another control device, in order to measure a duration. Then it can be returned to its starting point. Many chronographs also include indicator elements for displaying the current time in addition to displaying the measured duration.

[0004] When a first pressure is exerted on a pusher (or another control device) of a chronograph watch, the indicator member, which is at rest corresponding to an initial time indication of a first set of time indications generally carried by a dial, starts up (“start”). A second press on the same pusher or on another pusher has the effect of stopping the indicator member at the precise point where it was at the time of this pressure (“stop”). By a third press, on the same pusher or on another, the indicator member quickly returns to its starting point, that is to say in correspondence with the initial time indication ("reset-to-zero") . In this way, it is possible to measure a duration of time.

[0005] In this context, the term “indication” indicates a sign, such as for example a line, a number, a letter, a symbol and/or a combination of these, carried by an element of the watch, such as than a dial or a bezel.

[0006] Certain known chronograph watches, in particular wristwatches, also include a second set of non-time or auxiliary indications, such as for example tachymetric, pulsometer or telemetric indications, which are also carried by an element of the watch , such as for example a bezel or a dial. As with the set of time indications, this set of auxiliary indications generally also includes an initial auxiliary indication, a final auxiliary indication and possible intermediate auxiliary indications between the two.

The indicator member, which is connected to a counter wheel of a determined time, for example a chronograph seconds, chronograph minutes or chronograph hours wheel, is generally at rest. When a user activates a control device of the chronograph watch, for example a pusher, he starts a rotation of this indicator member.

[0008] In known solutions, the rotation speed of the indicator member is constant. The user stops the movement of this indicator member, for example with the same pusher, when a condition is satisfied. The indicator member thus stops in correspondence with an auxiliary indication, or between two adjacent auxiliary indications. The user can thus read information corresponding to the stopping position of the indicator member.

[0009] In the case where the chronograph watch carries a tachymeter scale, this stopping condition of the indicator member is generally a certain distance traveled by a person or a moving object upon actuation of the watch pusher. -chronograph. The moving object can for example be a vehicle such as a car, in particular a sports car. For example, this distance can be 100 m or 1000 m. The user can thus read the speed of the person or the moving object corresponding to the stopping position of the indicator member on the scale.

[0010] In the case where the chronograph watch carries a pulsometer scale, this stopping condition of the indicator member is generally a certain number of cardiac pulsations counted by the user upon actuation of the watch pusher. chronograph, for example and in a non-limiting manner 15 or 30 pulses. The user can thus read his or her heart rate or that of another person corresponding to the stopping position of the indicator member on the scale.

[0011] In the case where the chronograph watch carries a telemetric scale, this stopping condition of the indicator member is generally the hearing of a sound linked to an event, the rotation of the indicator member having been started by the user when viewing this event. A telemetric scale makes it possible to calculate the distance separating an observer wearing the watch and a given point where this event takes place, via the speed of sound (around 340 m/s), by comparing the vision of a event and the time it takes for the sound to be heard by the user. The indicator is thus stopped in correspondence with a certain indication of the telemetric scale. Corresponding to this indication, the user can thus read the distance which separates him from this given point. This distance can for example be the distance from the user of a flash or the distance separating several troops depending on the shots or detonations heard, for example.

[0012] In most known solutions, the scale of the time indications presents a distance between a time indication and the successive one which is substantially constant over all of the time indications. In other words, in most known solutions, the time scale has a constant resolution.

[0013] In some of the known solutions, the scale of the auxiliary indications (for example the tachymetric, pulsometric or telemetric scale) also presents a distance between an auxiliary indication and the successive one which is substantially constant over all of the auxiliary indications.

In general, a scale of temporal or auxiliary indications having a distance between an indication and the successive one constant and of reasonable length is easily read by the user.

[0015] A scale having a constant distance between one indication and the successive one, in combination with the indicator member which rotates with a constant rotation speed, allows the user to read information (temporal or auxiliary) with the same level detail on all indications (temporal or auxiliary). However, depending on the applications, there is a need to have more (or less) detailed (or precise) information for one or more subsets of all the indications of the scale concerned.

If we consider a scale of time indications, for example the scale of timed seconds, it may be interesting to read more precise information around certain subsets of the time indications, for example in the subset of the first 10 seconds or 15 seconds timed, compared to other subsets.

[0017] This need also concerns certain scales of auxiliary indications.

[0018] For example, an athlete has a heart rate under exercise of approximately 180 beats per minute. Therefore, it may be interesting to read more precise information corresponding to a subset around this heart rate.

[0019] Or again, a racing car can arrive at a high speed, for example around 200 km/h or more, after having covered a predetermined distance, for example a distance of 1000 m. Therefore, it may be interesting to read more precise information corresponding to a subset around this speed.

[0020] A scale (with temporal or auxiliary indications) with a constant distance between one indication and the successive one, in combination with the indicator member which rotates with a constant speed of rotation, therefore generally allows good readability of the information from the user, but it does not make it possible to favor certain subsets of all the indications (temporal or auxiliary) which are interesting for an envisaged application, compared to other subsets.

[0021] In certain known solutions, the scale carrying auxiliary indications has a distance between an auxiliary indication and the successive variable, namely a distance which is not constant over all of the auxiliary indications. In these solutions, the indicator member, which in general is the indicator member for the timed seconds, rotates with a constant rotation speed.

[0022] Although this solution makes it possible to favor certain subsets of the set of auxiliary indications which are interesting for the envisaged application, compared to other subsets, by using a distance between an auxiliary indication and that successive variable, the readability of the information is not satisfactory. In fact, certain distances between an auxiliary indication and the successive one on the scale have dimensions that are too small to be read easily. Furthermore, if the indicator member stops between two adjacent indications separated by too short a distance, the information read risks not being sufficiently precise for the intended application.

Brief summary of the invention

An aim of the present invention is to propose a watch mechanism for a watch free from the limitations of known watch mechanisms.

[0024] Another aim of the invention is to propose a watch mechanism for a watch which allows the user to have more or less precise information for one or more subsets of all the desired indications, with a better readability of known solutions.

Another aim of the invention is to propose a watch mechanism for a watch alternative to known solutions.

[0026] According to the invention, these goals are achieved in particular by means of the watch mechanism for a watch according to claim 1.

The watch mechanism for a watch according to the invention comprises: – a current time mobile, comprising an axis and being arranged to rotate (permanently) around this axis, – a first mobile, comprising a first axis and being arranged to be connected to the mobile of the current time and to rotate around this first axis with a constant rotation speed, – an indicator member, – a second mobile, arranged to mesh with the first mobile, and to be connected to the indicator member , – an element carrying a scale comprising a set of indications, this indicator member making it possible to display information on this scale, for example temporal or auxiliary information.

[0028] According to the invention, the first mobile and the second mobile are arranged so as to obtain a gear ratio between the first mobile and the second mobile which varies as a function of their relative angular position, so that the The indicator member rotates with a variable rotation speed in correspondence with at least a subset of the set of scale indications.

[0029] Thanks to the fact that the indicator member rotates with a variable rotation speed, corresponding to at least a subset of the set of scale indications, it is possible to design several scales which are more readable compared to known solutions, while making it possible to display more (or less) detailed (or more or less precise) information for one or more subsets of all the indications concerned.

For example, it is possible to use a scale with a distance between one indication and the successive one constant over the entire set of indications on the scale. Instead of using a scale with a distance between one indication and the successive variable, which cooperates with an indicator member which rotates with a constant speed of rotation, the mechanism according to the invention makes it possible to use a scale with a constant distance, and therefore more readable, since the indicator member rotates with a variable speed of rotation.

It is also possible to use a scale with a distance between one indication and the successive variable, at least for a subset of the set of indications of the scale. This scale, combined with the variable rotation speed of the mechanism according to the invention, makes it possible to have - in correspondence with the subsets of indications of interest for the envisaged application - distances between an indication and the successive one (variable ) which have larger dimensions of the corresponding distances from the known solutions, which allows better readability and precision of the desired information compared to the known solutions. This scale, combined with the variable rotation speed of the mechanism according to the invention, also makes it possible to have - in correspondence with subsets of indications which are not of interest for the envisaged application - distances between an indication and the successive one (variables) which have smaller dimensions of the corresponding distances from the known solutions.

[0032] In one embodiment, the scale carries time indications, for example indications of seconds, minutes or hours of the current time, or indications of seconds, minutes or timed hours.

[0033] In one embodiment, the scale carries auxiliary indications, for example the scale is a tachymetric, pulsometric or telemetric scale.

[0034] In one embodiment, the watch mechanism carries both at least one scale carrying time indications and at least one scale carrying auxiliary indications, the two scales cooperating with the same indicator member which rotates with a rotation speed variable, so that the user can read respectively auxiliary temporal information.

The scale of the auxiliary indications can be carried by the same element which carries the scale of the time indications (for example, a dial can carry both scales), or it can be carried by another element (for example , the dial can carry the scale of the time indications and the bezel that of the auxiliary indications).

[0036] In one embodiment, the first mobile is arranged to be permanently connected to the mobile of the current time. In this case, the watch may not have a chronograph function. In one embodiment, the watch includes a 24-hour display in which the distance between a time indication and the successive one is variable, for example greater for daytime hours and smaller for nighttime hours.

[0037] In one embodiment, the mechanism comprises: – an actuation device, and – a clutch mechanism, arranged to be able to connect under the action of the actuation device the mobile of the current time with the first mobile . In this case, the watch can be a chronograph watch.

[0038] In one embodiment, the mechanism comprises an input mobile, comprising an input axis and being arranged to rotate around this input axis, the input mobile being arranged to be driven in rotation by the mobile of current time. In this embodiment, the clutch mechanism is arranged to be able to connect, under the action of the actuation device, the mobile of the current time with the first mobile via the input mobile.

[0039] In one embodiment, the first mobile and the second mobile have the same shape defined by rays of different length, the first mobile and the second mobile being arranged so that the sum of the rays of each mobile in correspondence of the gearing of the two mobiles is constant, the sum of these radii being equal to the center distance of the two mobiles.

[0040] In one embodiment, the sum of these radii belongs to the range from 3 mm to 8 mm, preferably from 5 mm to 6 mm, in particular from 5.436 mm to 5.450 mm.

[0041] In one embodiment, the first mobile and the second mobile have the same perimeter. In another embodiment, the perimeter of the first mobile is a multiple of the perimeter of the second mobile. In another embodiment, the perimeter of the second mobile is a multiple of the perimeter of the first mobile.

[0042] In this context, the expression “perimeter of a mobile” designates the original (or reference) perimeter of this mobile.

[0043] In one embodiment, the subset of scale indications in which the indicator member rotates with a variable rotation speed is a first subset of the set of indications, the set comprising a second subset distinct from the first subset, each of the first mobile and second mobile is arranged so that the rotation of the second mobile remains constant in correspondence with the second subset of scale indications.

[0044] In one embodiment, each of the first mobile and second mobile has the same shape (or the same profile).

[0045] In one embodiment, each of the first mobile and second mobile is a cam having a spiral shape, for example a logarithmic spiral.

[0046] In one embodiment, each of the first mobile and second mobile comprises at least one recess, in order to reduce its unbalance when resetting the indicator member.

[0047] In one embodiment, the watch mechanism according to the invention comprises a core coaxial with the second mobile, the shape of the heart being optimized in order to compensate for the shape of the second mobile, to allow a reset to zero of the indicator organ.

[0048] In one embodiment, the second mobile and/or the core comprises a core indexing means, for example a through hole.

[0049] In one embodiment, the teeth of the first mobile and/or the second mobile are arranged to reduce chattering of the indicator member.

[0050] In one embodiment, the element of the watch mechanism according to the invention is a dial or a portion of the dial.

[0051] In one embodiment, the element of the watch mechanism according to the invention is a bezel or a portion of a bezel.

[0052] The invention also relates to a watch, for example a wristwatch, comprising the watch mechanism according to the invention. In one embodiment, this watch is a chronograph watch.

Brief description of the figures

[0053] Examples of implementation of the invention are indicated in the description illustrated by the appended figures in which:

[0054] Figure 1 illustrates a top view of a part of a watch movement, which is a chronograph watch in this embodiment, comprising an embodiment of the watch mechanism according to the invention.

[0055] Figure 2 illustrates a perspective view of part of the watch mechanism of Figure 1.

[0056] Figure 3 illustrates a bottom view of the watch mechanism of Figure 2.

[0057] Figure 4A is a graph illustrating the variation over time of the speed of rotation of the indicator member of the watch mechanism according to one embodiment of the invention, relative to the constant speed of known solutions.

[0058] Figures 4B and 4C are also graphs illustrating the variation over time of the rotation speed of the indicator member of the watch mechanism according to other embodiments of the invention.

[0059] Figure 5 illustrates a view from above of an embodiment of a scale of the watch mechanism according to the invention, in particular of a 100 m tachometer scale with a distance between an auxiliary indication and the successive variable one.

[0060] Figure 6 illustrates a top view of an embodiment of a scale of the watch mechanism according to the invention, in particular of a 1000 m tachometer scale with a distance between an auxiliary indication and the successive variable one.

[0061] Figure 7 illustrates a view from above of an embodiment of a scale of the watch mechanism according to the invention, in particular of a pulsometric scale for 30 pulsations with a distance between an auxiliary indication and the successive variable one .

[0062] Figure 8 illustrates a view from above of an embodiment of a scale of the watch mechanism according to the invention, in particular of a pulsometric scale for 15 pulsations with a distance between an auxiliary indication and the successive variable one. .

[0063] Figure 9 illustrates a view from above of an embodiment of a scale of the watch mechanism according to the invention, in particular of a telemetric scale with a distance between an auxiliary indication and the successive variable one.

Example(s) of mode(s) of carrying out the invention

[0064] In the following description provided by way of example, reference will be made, for simplicity, to a chronograph watch. It must be understood, however, that the invention is not limited to a chronograph watch, but also includes watches which are not chronograph watches. The invention is also not limited to the presence of a clutch mechanism.

[0065] In the following description provided by way of example, reference will be made to scales comprising several indications, the distance between one indication and the successive one being variable at least for a subset of the set of indications. It should, however, be understood that the invention is not limited to these embodiments, but also includes watch mechanisms comprising scales with several indications, the distance between one indication and the successive one being constant for the entire set of indications. .

[0066] Figure 1 illustrates a view from above of a part of a movement, which in the example illustrated is a movement 1000 for a chronograph watch, comprising an embodiment of the watch mechanism according to the invention.

[0067] In the embodiment illustrated in Figure 1, this movement 1000 allows the display of the current time in addition to the display of a measured duration. In another embodiment (not illustrated), this movement 1000 does not allow the current time to be displayed.

[0068] The operation of a movement 1000 for a chronograph watch (without or with the display of the current time) being known per se, it will not be described in detail here. By way of non-limiting example, the operation of the movement 1000 for a chronograph watch in Figure 1 is based on a column wheel 4 which is conventionally connected to rockers 5.

[0069] The watch mechanism, part of which is illustrated in Figures 2 and 3, comprises an input mobile 8, comprising an input axis 10 and is arranged to rotate, preferably permanently, around this axis d entry 10.

[0070] In the example of Figures 2 and 3, this input mobile 8 is rotated by a current time mobile 7 of the kinematic chain making it possible to count and display the current time, i.e. that is to say the kinematic chain linking a source of energy, for example a barrel, to a regulating organ and to the wheels of the watch, which are linked to the indicators of the watch in order to display the hour, minutes and/or or current seconds. This current time mobile 7 can for example be a current seconds wheel, which is therefore arranged to rotate around its axis 70 with a constant rotation speed, for example one revolution per minute (or 6° per second). . In the example illustrated, the input mobile 8 also rotates with a constant rotation speed, for example with the same rotation speed of one revolution per minute.

[0071] A clutch mechanism is arranged to be able to connect, under the action of an actuating device, the input mobile 8 with the first mobile 1 of the mechanism according to the invention.

[0072] The clutch mechanism can be a horizontal or lateral, vertical, oscillating pinion, etc. clutch mechanism. Since the clutch mechanisms are known per se, they will not be described here. By way of example, Figures 2 and 3 illustrate a vertical clutch mechanism, comprising a flange 9. Following the action of the user on a pusher (not illustrated) of the chronograph watch, an actuating device (not illustrated) comprising for example pliers (not illustrated) makes it possible to move the flange 9 along the axis of rotation 10, in order to produce the clutch between the input mobile 8 and the first mobile 1.

Of course, the fact that in the example of Figures 2 and 3 the axis of rotation of the input mobile 8 corresponds to the axis of rotation 10 of the first mobile 1 is not an essential characteristic of the invention and depends on the type of clutch chosen.

The first mobile 1 can thus rotate around the axis 10 with a constant rotation speed when it is connected to the input mobile 8 by the clutch mechanism.

[0075] In one embodiment, the rotation speed of the first mobile 1 is equal to that of the input mobile 8, for example and in a non-limiting manner it is one revolution per minute. In another embodiment, the rotation speed of the first mobile 1 is different from that of the input mobile 8, for example it is smaller.

The first mobile 1 is therefore a driving mobile which is rotated around its axis of rotation 10 following an action by the user.

The watch mechanism 100 according to the invention also comprises a second mobile 2, arranged to mesh with the first mobile 1, and to be connected to an indicator member (not illustrated in Figures 1 to 3).

[0078] The second mobile 2 is therefore a mobile driven by the first leading mobile 1. It is rotated around its axis of rotation 20.

[0079] The watch mechanism according to the invention also comprises an element (not illustrated in Figures 1 to 3), such as for example a dial (or a portion of a dial) or a bezel (or a portion of a bezel) carrying a scale comprising a set of indications, the indicator member making it possible to display information on this scale, for example temporal or auxiliary information (such as for example tachymetric, pulsometer or telemetric information). Examples of auxiliary indication scales are illustrated for example in Figures 5 to 11, which will be discussed later. The ladder in general has an arcuate shape or a substantially circular shape. Of course, the ladder can have other shapes, for example and without limitation a spiral shape.

[0080] According to the invention, the first mobile 1 and the second mobile 2 are arranged so as to obtain a gear ratio between the first mobile 1 and the second mobile 2 which varies as a function of their relative angular position, so so that the indicator member rotates with a variable rotation speed, corresponding to at least a subset of the set of indications carried by the scale.

[0081] In particular, the indicator member rotates with a variable rotation speed because it is connected to the second mobile 2 which rotates at a variable rotation speed corresponding to at least a subset of the set of indications. In a preferred embodiment, the rotation speed of the second mobile 2 corresponds to that of the indicator member. In a preferred embodiment, the indicator member is mounted on the axis of rotation 20 of the second mobile 2.

[0082] Thanks to the fact that the indicator member rotates with a variable rotation speed, corresponding to at least a subset of the set of indications carried by the scale, it is possible to design several scales which are more readable compared to known solutions, while making it possible to display more (or less) detailed (or more or less precise) information for one or more subsets of all the indications concerned.

[0083] In a preferred embodiment, the first mobile 1 and the second mobile 2 have the same shape. In another embodiment, the first mobile 1 and the second mobile 2 have different shapes.

[0084] In a preferred embodiment, this shape is defined by rays of different length, the first mobile 1 and the second mobile 2 being arranged so that the sum of the rays R1, R2 of each mobile 1, 2 in correspondence of the gearing of the two mobiles is constant, as visible for example in Figure 1.

[0085] Advantageously, the sum of these radii R1 and R2 is equal to the center distance between the two mobiles 1 and 2, namely the distance between the axis of rotation of the first mobile 10 and the axis of rotation 20 of the second mobile.

[0086] In one embodiment, the sum of these radii R1 and R2 belongs to the range from 3 mm to 8 mm, preferably from 5 mm to 6 mm, in particular from 5.436 mm to 5.450 mm.

[0087] In one embodiment, the first mobile 1 and the second mobile 2 have the same perimeter. In another embodiment, the perimeter of the first mobile 1 is a multiple of the perimeter of the second mobile 2. In another embodiment, the perimeter of the second mobile 2 is a multiple of the perimeter of the first mobile 1.

[0088] Thanks to the watch mechanism according to the invention, it is thus possible to design several display possibilities, according to the needs of specific applications, while improving the readability of the information on the part of the user, at least in the (s) subset(s) of interest of the indications carried by the scale, according to the application concerned.

[0089] In the embodiment of Figures 1 to 3, each of the first mobile 1 and second mobile 2 is a cam having a spiral shape, for example a logarithmic spiral. This form is not limiting and other forms can be designed in the context of the invention.

[0090] For example, in one embodiment, the first and second mobile 1, 2 have a shape other than a spiral, and more resemble a patatoid or a toothed cam.

[0091] In general, the shape of the first and second mobile 1, 2 can be calculated by a calculation module, by considering the desired rotation speed constraints in the subsets of the scale of interest and/or in the corresponding timed time interval, the constraint according to which the sum of the radii of each mobile in correspondence with the gearing of the two mobiles is constant, the sum of these rays being equal to the center distance of the two mobiles 1 and 2 and one of the constraints on the perimeter of the two mobiles.

[0092] In one embodiment, each of the first mobile 1 and second mobile 2 comprises at least one recess 12 respectively 22 (two in the example of Figure 1), in order to reduce its unbalance during reset. -zero of the indicator body.

[0093] In one embodiment, the watch mechanism according to the invention comprises a core 3 coaxial with the second mobile 2 (visible in Figures 2 and 3).

[0094] In one embodiment, the second mobile 2 and/or the core 3 comprises means for indexing this core, for example the through hole 21 of Figure 2 (better visible in Figure 2) respectively the hole crossing 31 of Figure 3, which must be aligned in order to allow this indexing.

[0095] In one embodiment, the teeth of the first mobile and/or the second mobile are arranged to reduce chattering of the indicator member.

[0096] In the embodiment where the first mobile 1 rotates with a speed which makes it possible to count a duration in seconds, for example a speed of one revolution per minute, and it can be connected to an element such as the plate 6 visible in Figure 2, which makes it possible to drive, for example by means of a spring, the rotation of another timed time mobile, for example the timed minutes mobile. In turn, the timed minutes mobile can be connected to an element similar to plate 6 in Figure 2, which makes it possible to drive the rotation of another timed time mobile in a similar way, for example the hours mobile. timed.

[0097] When the user starts the rotation of the indicator member, the input mobile 8 leads the first mobile 1 and therefore the second mobile 2. In one embodiment, when the user starts the reset zero of the indicator member, the second mobile 2 - via the first mobile 1 - drives the input mobile 8, following the action of a hammer (not illustrated) on the heart 3. To avoid an arm effect of the lever linked to the friction of the input mobile 8, in one embodiment, the core 3 has an optimized shape in order to compensate for the shape of the second mobile to allow a reset to zero of the indicator member which reduces or even cancels the disadvantages caused by the friction of the input mobile 8, which is a driven mobile (and no longer leading) during the reset.

[0098] Figure 4A is a graph illustrating the variation over time of the speed v of rotation of the indicator member of the watch mechanism according to one embodiment of the invention, relative to a constant speed of known solutions, which in general is 6° per second. In the example illustrated, the rotation speed, greater than 6° per second when the indicator member starts, decreases with a law of decrease, for example a law of logarithmic decrease, in the range 0 -t3, t3 being by example 60 seconds.

[0099] Figures 4B and 4C are also graphs illustrating the variation over time of the rotation speed of the indicator member of the watch mechanism according to other embodiments of the invention.

[0100] In the example of Figure 4B, the rotation speed decreases according to a first law in the range 0 - t1 (which corresponds for example to a first subset of the set of indications), it remains constant in the range t1- t2 (which corresponds for example to a second subset of the set of indications) and it decreases according to a second law in the range t2- t3 (which corresponds for example to a third subset of the set of indications).

[0101] In the example of Figure 4C, the rotation speed increases in the range 0 - t1 (which corresponds for example to a first subset of the set of indications), it remains constant in the range t1 - t2 (which corresponds for example to a second subset of the set of indications) and it decreases in the range t2-t3 (which corresponds for example to a third subset of the set of indications).

[0102] The watch mechanism according to the invention therefore makes it possible to design several speed profiles for the indicator member. This, combined with a scale of indications (temporal or auxiliary) having a distance between an indication and the successive constant or variable one, allows the user to have more or less detailed information for one or more subsets of the all the desired indications, with better readability of known solutions.

[0103] In one embodiment, the scale of the mechanism according to the invention is a time scale, carrying indications of the timed time, for example timed seconds, minutes or hours. In one embodiment, the first mobile and the second mobile are arranged so as to allow the user to read the time more precisely at least in a subset of the set of indications carried by this scale. In a preferred embodiment, this subset corresponds to the interval 0 seconds -10 seconds of the timed seconds.

[0104] In one embodiment, the watch mechanism according to the invention carries a tachymeter scale.

[0105] Figure 5 illustrates a top view of an embodiment of a tachymeter scale 100 of the watch mechanism according to the invention. In this embodiment, the mechanism according to the invention also includes a timed time scale 300, for example timed seconds.

[0106] In the embodiment of Figure 5, the tachymeter scale 100 and that of timed seconds 300 share the same graduation signs, the digital values of the tachymeter scale 100 being arranged on an outer arc of a circle and those of the timed seconds scale 300 being arranged on an interior arc of a circle, the two arcs of a circle having the same center 20.

[0107] This tachymeter scale 100 is particularly suitable for an athlete who runs over a distance of 100 m and carries indications of average speed over this distance, measured in km/h. It carries an initial auxiliary indication 101 of 100 km/h (this value is not limiting), a final auxiliary indication 102 of 10 km/h (this value is also not limiting) and intermediate auxiliary indications between the two. Of course, the initial, final and intermediate auxiliary indications are given by way of example, and they are not limiting. This applies to all scales shown in Figures 5 to 11.

[0108] As it is possible to see in Figure 5, the auxiliary indications have a variable distance between one indication and the successive one. In the example illustrated, they are spaced 10 km/h apart in the subset between 100 km/h and 80 km/h, the distance between one indication and the successive one in this first subset being increasingly greater. ; of 5 km/h in the subset between 80 km/h and 40 km/h, the distance between an indication and the successive one in this second subset also being greater and greater, and they are finally spaced by 1 km/h in the subset between 40 km/h and 10 km/h, the distance between an indication and the successive one in this third subset being increasingly greater.

[0109] The scale 100 has an arcuate shape, having the center in correspondence with the axis of rotation 20. The indicator member, which is arranged to rotate around the axis of rotation 20, at rest has one end in connection of 12 hours. Corresponding to this angular position, indicated by the reference 201, the timed time scale 300 generally carries an initial indication of the timed time (not illustrated), for example 0 seconds.

[0110] When a first pressure is exerted on a pusher (or another control device) of the chronograph watch, the indicator member starts with a rotational movement whose direction is indicated by the arrow A.

[0111] The first and second mobiles 1 and 2 which cooperate with the scale 100 of FIG. 5 in one embodiment are arranged so that the indicator member rotates with decreasing speed as the indicator organ rotates.

[0112] In this embodiment, the first and second mobile 1, 2 can have a spiral shape, for example a logarithmic spiral.

[0113] A second pressure on the same pusher or on another pusher has the effect of stopping the indicator member at the precise point where it was located during this pressure.

[0114] The scale 100 of Figure 5, combined with the variable rotation speed of the mechanism according to the invention, makes it possible to have - in correspondence with the subset of indications of interest for the envisaged application - distances between an indication and the successive one (variables) which have larger dimensions of the corresponding distances (also variables) of the known solutions, which allows readability and precision of the desired information in correspondence of the stopping point of the indicator body which are better compared to known solutions.

[0115] This scale 100, combined with the variable rotation speed of the mechanism according to the invention, also makes it possible to have - in correspondence with subsets of indications which are not of interest for the envisaged application - distances between an indication and the successive one (variables) which have smaller dimensions of the corresponding distances (also variables) of the known solutions.

[0116] This makes it possible to have a level of detail configured for the different subassemblies according to the application of interest, while allowing better readability of the desired information compared to known solutions.

[0117] As it is possible to see in Figure 5, the indications of the timed time scale 300 also have a distance between one indication and the successive variable.

[0118] The initial indication 301 of the timed time scale 300 in the embodiment of FIG. 5 is offset relative to the initial indication 101 of the tachymeter scale 100, and the final indication 302 of the scale of the timed time 300 shares the same graduation sign of the final indication 102 of the tachymetric scale 100. However, this embodiment is not limiting and any other arrangement of the indications of the two scales can be considered. This also applies to the embodiments of Figures 6 to 9.

[0119] The timed seconds scale 300 of Figure 5, combined with the variable rotation speed of the mechanism according to the invention, also makes it possible to have - in correspondence with the subset of indications of interest for the envisaged application - distances between an indication and the successive one (variable) which have larger dimensions of the corresponding distances (also variable) of the known solutions, which allows readability and precision of the desired information in correspondence of the point of stopping of the indicator organ which are better compared to known solutions.

[0120] Figure 6 illustrates a view from above of an embodiment of a scale 100 of the watch mechanism according to the invention, in particular of a tachometer scale 1000 m. In this embodiment, the mechanism according to the invention also includes a timed time scale 300, for example timed seconds.

[0121] In the embodiment of Figure 6 also, the tachymeter scale 100 and that of timed seconds 300 share the same graduation signs, the digital values of the tachymeter scale 100 being arranged on an outer arc of a circle and those of the timed seconds scale 300 being arranged on an interior arc of a circle, the two arcs of a circle having the same center 20.

[0122] This tachometer scale 100 is particularly suitable for a car which travels a distance of 1000 m (for example between two levels of a motorway) and carries indications of average speed over this distance, measured in km/h. It carries an initial auxiliary indication 101 of 400 km/h, a final auxiliary indication 102 of 60 km/h and intermediate auxiliary indications between the two.

[0123] As it is possible to see in Figure 6, the auxiliary indications are spaced 10 km/h apart in the subset between 400 km/h and 200 km/h, the distance between one indication and the successive one in this first subset being increasingly greater, and 5 km/h in the subset between 200 km/h and 60 km/h, the distance between an indication and the successive one in this second subset also being bigger and bigger.

[0124] The scale 100 has an arcuate shape, having the center in correspondence with the axis of rotation 20. The indicator member, which is arranged to rotate around the axis of rotation 20, at rest has one end at 12 o'clock, where there is also the final auxiliary indication 102.

[0125] When a first pressure is exerted on a pusher (or another control device) of the chronograph watch, the indicator member starts with a rotational movement whose direction is indicated by the arrow A.

[0126] The first and second mobiles 1 and 2 which cooperate with the scale 100 of FIG. 6 in one embodiment are arranged so that the indicator member rotates with decreasing speed as the indicator organ rotates.

[0127] In this embodiment, the first and second mobile 1, 2 can in this case also have a spiral shape, for example a logarithmic spiral.

[0128] A second pressure on the same pusher or on another pusher has the effect of stopping the indicator member at the precise point where it was at the time of this pressure.

[0129] As for the scale of Figure 5, the scale 100 of Figure 6 has a level of detail customized for the different subassemblies according to the application of interest, while allowing readability of the information desired better compared to known solutions.

[0130] As for the scale of Figure 5, the timed time scale 300 of Figure 6 has a customized level of detail for different subassemblies, while allowing better readability of the desired information compared to the known solutions.

[0131] Figure 7 illustrates a view from above of an embodiment of a scale 100 of the watch mechanism according to the invention, in particular of a pulsometric scale for 30 pulsations. This 100 scale is particularly suitable for calculating the heart rate of an athletic person. In this embodiment, the mechanism according to the invention also includes a timed time scale 300, for example timed seconds.

[0132] In the embodiment of Figure 7 also, the pulsometer scale 100 and that of timed seconds 300 share the same graduation signs, the digital values of the pulsometer scale 100 being arranged on an outer arc of a circle and those of the timed seconds scale 300 being arranged on an interior arc of a circle, the two arcs of a circle having the same center 20.

[0133] This pulsometer scale 100 carries indications of the heart rate, measured in number of pulsations per minute (pulses/min). It carries an initial auxiliary indication 101 of 200 puls/min, a final auxiliary indication 102 of 41 puls/min and intermediate auxiliary indications between the two.

[0134] As it is possible to see in Figure 7, the auxiliary indications are spaced by 10 pulses/min in the subset between 200 pulses/min and 140 pulses/min, the distance between an indication and the successive one in this first subset being increasingly larger, by 5 more/min in the subset between 140 pulses/min and 80 pulses/min, the distance between an indication and the successive one in this second subset also being more larger and 1 puls/min in the subset between 80 puls/min and 41 puls/min and, the distance between an indication and the successive one in this third subset also being increasingly greater.

[0135] The scale 100 has an arcuate shape, having the center in correspondence with the axis of rotation 20. The indicator member, which is arranged to rotate around the axis of rotation 20, at rest has one end in connection of 12 hours. Corresponding to this angular position, indicated by the reference 201, the timed time scale 300 generally carries an initial indication of the timed time (not illustrated), for example 0 seconds.

[0136] When a first pressure is exerted on a pusher (or another control device) of the chronograph watch, the indicator member starts with a rotational movement whose direction is indicated by the arrow A.

[0137] The first and second mobiles 1 and 2 which cooperate with the scale 100 of FIG. 7 in one embodiment are arranged so that the indicator member rotates with decreasing speed as the indicator organ rotates.

[0138] In this embodiment, the first and second mobile 1, 2 can have a spiral shape, for example a logarithmic spiral.

[0139] A second pressure on the same pusher or on another pusher has the effect of stopping the indicator member at the precise point where it was at the time of this pressure.

[0140] The scale 100 of Figure 7, combined with the variable rotation speed of the mechanism according to the invention, makes it possible to have - in correspondence with the subsets of indications of interest for the envisaged application - distances between an indication and the successive one (variables) which have larger dimensions of the corresponding distances of the known solutions, which allows readability and precision of the desired information in correspondence with the stopping point of the indicator member better by compared to known solutions.

[0141] This scale 100, combined with the variable rotation speed of the mechanism according to the invention, also makes it possible to have - in correspondence with subsets of indications which are not of interest for the envisaged application - distances between an indication and the successive one (variables) which have smaller dimensions than the corresponding distances of the known solutions.

[0142] This makes it possible to have a level of detail configured for the different subassemblies according to the application of interest, while allowing better readability of the desired information compared to known solutions.

[0143] The timed time scale 300 of Figure 7 also has a level of detail customized for different subassemblies, while allowing better readability of the desired information compared to known solutions.

[0144] Figure 8 illustrates a view from above of an embodiment of a scale 100 of the watch mechanism according to the invention, in particular of a pulsometric scale for 15 pulsations. This 100 scale is also particularly suitable for calculating the heart rate of an athletic person. In this embodiment, the mechanism according to the invention also includes a timed time scale 300, for example timed seconds.

[0145] In the embodiment of Figure 8 also, the pulsometer scale 100 and that of timed seconds 300 share the same graduation signs, the digital values of the pulsometer scale 100 being arranged on an outer arc of a circle and those of the timed seconds scale 300 being arranged on an interior arc of a circle, the two arcs of a circle having the same center 20.

[0146] This pulsometer scale 100 carries indications of the heart rate, measured in number of pulsations per minute (pulses/min). It carries an initial auxiliary indication 101 of 200 puls/min, a final auxiliary indication 102 of 40 puls/min and intermediate auxiliary indications between the two.

[0147] The same considerations made for the scale of Figure 7 apply to that of Figure 8.

[0148] Figure 9 illustrates a view from above of an embodiment of a scale 100 of the watch mechanism according to the invention, in particular of a telemetric scale. In this embodiment, the mechanism according to the invention also includes a timed time scale 300, for example timed seconds.

[0149] In the embodiment of Figure 9 also, the telemetric scale 100 and that of timed seconds 300 share the same graduation signs, the digital values of the telemetric scale 100 being arranged on an outer arc of a circle and those of the timed seconds scale 300 being arranged on an interior arc of a circle, the two arcs of a circle having the same center 20.

[0150] This telemetric scale 100 is particularly suitable for calculating a distance in meters. It carries an initial auxiliary indication 101 of 0.10 m, a final auxiliary indication 102 of 20.00 m and intermediate auxiliary indications between the two. Of course, the initial, final and intermediate auxiliary indications are given by way of example, and they are not limiting.

[0151] As it is possible to see in Figure 9, the auxiliary indications are spaced 0.10 km apart in the subset between 0.10 km and 1.00 km, the distance between an indication and the successive one in this first subset being constant, of 0.25 km in the subset between 1.00 km and 5.00 km, the distance between an indication and the initial successive one in this second subset being variable and decreasing in the direction of arrow A, and 0.50 km in the subset between 5.00 km and 20.00 km, the distance between an indication and the successive one in this third subset being variable with another decrease in the direction of arrow A.

[0152] The indicator member, which is arranged to rotate around an axis of rotation, which as a general rule corresponds to the axis of rotation 20 of the second mobile 20 and which passes through the center of the circle of which an arc carries the The scale 100, at rest has one end corresponding to 12 hours.

[0153] When a first pressure is exerted on a pusher (or another control device) of the chronograph watch, the indicator member starts with a rotational movement whose direction is indicated by the arrow A.

[0154] The first and second mobiles 1 and 2 which cooperate with the scale 100 of FIG. 9 in one embodiment are arranged so that the indicator member rotates with decreasing speed as the indicator organ rotates.

[0155] In this embodiment, the first and second mobile 1, 2 can have a spiral shape, for example a logarithmic spiral.

[0156] Although Figures 5 to 9 show examples of scales carrying both specific auxiliary indications and time indications, the invention should not be limited to such scales but it also applies to scales devoid of time indications or devoid of auxiliary indications as well as other scales carrying other auxiliary and/or time indications or with an arrangement different from that illustrated in Figures 5 to 9.

[0157] With the mechanism according to the invention, it is also possible to use a scale with a constant distance between one indication and the successive one.

Reference numbers used in the figures

[0158] 1 First mobile 2 Second mobile 3 Heart 4 Column wheel 5 Rocker 6 Plate 7 Current time mobile 8 Input mobile 9 Flange 10 Axis of rotation of the first mobile 12 Recess of the first mobile 20 Axis of rotation of the second mobile 21 Indexing hole 22 Recess for the second mobile 24 Indicator member 31 Indexing hole 61 Initial indication 62 Final indication 70 Axis of the current time mobile 100 Scale of auxiliary indications 101 Initial auxiliary indication 102 Final auxiliary indication 103 Condition for stopping the the indicator member 201 Angular position of 12 o'clock 300 Scale of time indications 301 Initial time indication 302 Final time indication 1000 Movement A Direction of rotation of the indicator member R1 Radius of the first mobile in correspondence of the gear with the second mobile R2 Radius of the second mobile in correspondence of the gear with the first mobile tiTime v Speed of rotation of the indicator member

Claims (16)

1. Watch mechanism for a chronograph watch comprising: – a current time mobile (7), comprising an axis (70) and being arranged to rotate around this axis (70), – a first mobile (1), comprising a first axis (10) and being arranged to be connected to the current time mobile (7) and to rotate around this first axis (10) with a constant rotation speed, – an indicator body (24), – a second mobile (2), arranged to mesh with the first mobile (1), and to be connected to said indicator member (24), – an element carrying a scale (100) comprising a set of indications, said indicator member making it possible to display information on this scale, characterized in that the first mobile (1) and the second mobile (2) are arranged so as to obtain a gear ratio between the first mobile (1) and the second mobile (2) which varies according to their relative angular position, so that the indicator member (24) rotates with a variable rotation speed corresponding to at least a subset of said set of indications. 2. Watch mechanism according to claim 1, the first mobile (1) being arranged to be permanently connected to the current time mobile (7). 3. Watch mechanism according to claim 1, comprising: – an actuation device, – a clutch mechanism (9), arranged to be able to connect, under the action of the actuation device, the current time mobile (7) with the first mobile (1). 4. Watch mechanism according to claim 3, comprising: – an input mobile (8), comprising an input axis and being arranged to rotate around this input axis, the input mobile being arranged to be rotated by the current time mobile (7) , the clutch mechanism (9) being arranged to be able to connect, under the action of the actuation device, the current time mobile (7) with the first mobile (1) via the input mobile (8). 5. Watch mechanism according to one of claims 1 to 4, the scale (100) comprising several indications, the distance between one indication and the successive one being constant for the entire set of indications. 6. Watch mechanism according to claim 1 to 4, the scale (100) comprising several indications, the distance between one indication and the successive one being variable at least for a subset of said set of indications. 7. Watch mechanism according to one of claims 1 to 6, the scale (100) being a tachymetric, pulsometric or telemetric scale. 8. Watch mechanism according to one of claims 1 to 7, the first mobile (1) and the second mobile (2) having the same shape. 9. Watch mechanism according to claim 8, said shape being defined by rays of different length, the first mobile (1) and the second mobile (2) being arranged so that the sum of the radii of each mobile corresponding to the gearing of the two mobile wheels is constant, the sum of these radii being equal to the center distance of the two mobiles. 10. The watch mechanism according to claim 9, the sum of the radii belonging to the range from 3 mm to 8 mm, preferably from 5 mm to 6 mm, in particular from 5.436 mm to 5.450 mm 11. Watch mechanism according to one of claims 1 to 10, said subset of scale indications being a first subset, the set of indications comprising a second subset distinct from the first subset , each of the first mobile and second mobile is arranged so that the rotation of the second mobile remains constant, in correspondence with the second subset of scale indications. 12. Watch mechanism according to one of claims 1 to 11, wherein the first mobile (1) and the second mobile (2) are two cams having a spiral shape, for example a logarithmic spiral. 13. Watch mechanism according to one of claims 1 to 12, in which each of the first mobile (1) and second mobile (2) comprises at least one recess (12, 22), in order to reduce their unbalance during a reset -to zero of the indicator body (24). 14. Watch mechanism according to one of claims 1 to 13, comprising a core (3) coaxial with the second mobile (2), the shape of the heart (3) being optimized in order to compensate for the shape of the second mobile (2) to allow resetting the indicator member (24). 15. Watch mechanism according to one of claims 1 to 14, said element carrying a scale (100) being a dial, a portion of the dial, a bezel or a portion of a bezel. 16. Chronograph watch comprising the watch mechanism according to one of claims 1 to 15.