Chronograph watch

Abstract

The invention relates to a chronograph watch comprising a timepiece mechanism, the timepiece mechanism comprising: - a current time wheel (7) comprising a shaft and being arranged to rotate on this shaft; - a first wheel (1), comprising a first shaft (10) and being arranged so as to be connected to the current time wheel (7); - an indicator member (24); - a second wheel (2) arranged so as to mesh with the first wheel (1) and to be connected to the indicator member (24); - an element bearing a scale (100) comprising a set of indications, the indicator member allowing information to be displayed on this scale. The wheels (1, 2) are arranged so as to obtain a gear ratio between the wheels (1, 2) that varies according to their relative angular position such that the indicator member (24) rotates at a variable speed of rotation while mapping at least one subset of the set of indications.

Description

Chronograph watch technical field

[0001] The present invention relates to a chronograph watch, in particular a chronograph watch comprising a clockwork mechanism which allows an indicator organ to rotate with a variable rotational speed. State of the art

[0002] A watch generally comprises a kinematic chain linking a power source, for example, but not limited to, a mainspring barrel, to one or more timekeeping components. These components are connected, directly or indirectly (for example, via one or more intermediate components), to one or more of the watch's indicating organs (such as, for example, but not limited to, hands) in order to display the current hour, minutes, and / or seconds. The timekeeping components are therefore arranged to rotate continuously at a constant speed.

[0003] A chronograph watch is a timekeeping device that measures time. Typically, it includes at least one indicator that can be started and stopped by means of a pusher or other control device to measure a duration. It can then be reset to its starting point. Many chronographs also include indicators for displaying the current time in addition to the measured duration.

[0004] When a pusher (or other control device) of a chronograph watch is pressed for the first time, the indicator, which is at rest corresponding to an indication The initial time setting of a first set of time indications, usually displayed on a dial, is activated ("start"). A second press of the same or another pusher stops the indicator at the precise point it was at when that push was pressed ("stop"). A third press of the same or another pusher quickly resets the indicator to its starting point, that is, to the initial time indication ("reset"). In this way, it is possible to measure a duration of time.

[0005] In this context, the term "indication" refers to a sign, such as for example a line, a number, a letter, a symbol and / or a combination thereof, carried by an element of the watch, such as a dial or a bezel.

[0006] Some well-known chronograph watches, particularly wristwatches, also include a second set of non-time or auxiliary indications, such as tachymeter, pulsometer, or telemeter readings, which are also displayed on a component of the watch, such as a bezel or dial. As with the timekeeping indications, this set of auxiliary indications generally includes an initial auxiliary indication, a final auxiliary indication, and possibly intermediate auxiliary indications in between.

[0007] The indicator, which is connected to a counter wheel for a specific time, such as a chronograph seconds, minutes, or hours wheel, is generally at rest. When a user activates a control device on the chronograph watch, such as a pusher, it sets this indicator in motion.

[0008] In known solutions, the rotational speed of the indicating element is constant. The user stops the movement of this element. The indicator, for example with the same pusher, stops when a condition is met. The indicator then stops corresponding to an auxiliary indication, or between two adjacent auxiliary indications. The user can thus read information corresponding to the indicator's stopped position.

[0009] If the chronograph watch has a tachymeter scale, the stopping point for the indicator is generally a certain distance traveled by a person or moving object after the chronograph pusher is activated. The moving object could be, for example, a vehicle such as a car, particularly a sports car. This distance could be, for instance, 100 meters or 1000 meters. The user can then read the speed of the person or moving object based on the position the indicator stops on the scale.

[0010] If the chronograph watch has a pulse scale, the indicator's stopping point is generally a certain number of heartbeats counted by the user immediately after pressing the chronograph's pusher, for example, 15 or 30 beats, but not limited to this. The user can then read their own heart rate or that of another person based on the indicator's stopping point on the scale.

[0011] In the case where the chronograph watch has a telemetry scale, the stopping condition of the indicator is generally the hearing of a sound related to an event, the rotation of the indicator having been initiated by the user upon seeing this event. A telemetry scale allows the distance between an observer wearing the watch and a given point where this event occurs to be calculated, using the speed of sound (approximately 340 m / s), by comparing the sighting of an event with the time it takes for the sound to be heard by the user. The indicator is thus stopped at a certain reading on the telemetry scale. At this reading, The user can thus read the distance separating them from this given point. This distance could be, for example, the user's distance from a lightning strike or the distance separating several troops based on gunfire or detonations heard, for example.

[0012] In most known solutions, the time scale exhibits a distance between each time marker and the next that is essentially constant across the entire set of time markers. In other words, in most known solutions, the time scale has a constant resolution.

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

[0014] In general, a scale of temporal or auxiliary indications having a constant distance between one indication and the next and of reasonable length is easily read by the user.

[0015] A scale with a constant distance between each reading, combined with an indicating element that rotates at a constant speed, allows the user to read information (temporal or auxiliary) with the same level of detail across all readings. However, depending on the application, there may be a need for more (or less) detailed (or precise) information for one or more subsets of the readings on the scale in question.

[0016] If we consider a scale of time indications, for example the scale of measured seconds, it can be useful 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 applies to certain scales of auxiliary indications.

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

[0019] Alternatively, a race car can reach a high speed, for example around 200 km / h or more, after covering a predetermined distance, for example a distance of 1000 m. Therefore, it can be useful to read more precise information corresponding to a subset around this speed.

[0020] A scale (with time or auxiliary indications) with a constant distance between one indication and the next, in combination with the indicating element which rotates with a constant rotation speed, therefore generally allows good readability of the information by the user, but it does not allow to privilege certain subsets of the set of indications (time or auxiliary) which are interesting for a envisaged application, compared to other subsets.

[0021] In certain known solutions, the scale bearing auxiliary markings has a variable distance between each auxiliary marking, that is, a distance that is not constant across all the auxiliary markings. In these solutions, the indicating element, which is generally the chronometer seconds indicator, rotates at a constant speed.

[0022] Although this solution allows for prioritizing certain subsets of the auxiliary indicators relevant to the intended application over other subsets by using a variable distance between an auxiliary indicator and its successor, the readability of the information is unsatisfactory. Indeed, some distances between an auxiliary indicator and its successor on the scale are too small to be easily read. Furthermore, if the indicator stops between two adjacent indicators separated by too short a distance, the information read may not be sufficiently precise for the intended application.

[0023] Document ITBG20090056A1 describes a clockwork mechanism that displays the current time using a hand that rotates at a variable speed. The mechanism includes a first wheel (reference 7A), which is fixed to a second, smaller wheel (reference 7B) located on a different plane. The first and second wheels rotate around a drive shaft. The first wheel meshes with a portion of a third wheel (reference 7C), which is fixed to a portion of a fourth wheel (reference 7D), smaller and located on the same plane as the second wheel. When the first wheel is no longer meshing with the third wheel, the second wheel meshes with the fourth wheel. This document indicates that the transition between the two gears (first wheel-third wheel and second wheel-fourth wheel) must be carefully executed.

[0024] Document JP407209440 relates to a clockwork mechanism that displays the current time using a hand that rotates at a variable speed. The mechanism includes a gear train with elliptical wheels, which connect a drive shaft to a hand shaft.

[0025] Document EP2945029 relates to a shock-absorbing clutch device comprising a clutch wheel capable of assuming an engaged and a disengaged position, a clutch member, and a cam. clutch cooperating with the clutch mechanism to define the engaged and disengaged positions of the clutch wheel.

[0026] Document US490123 relates to a chronograph mechanism engaged in counting the current hour.

[0027] Document DE1949177U concerns a pulsometer with a scale bearing indications at a variable distance between an auxiliary indication and the next. The needle rotates at a constant speed.

[0028] Document CH703579, in the name of the applicant, concerns a start, stop and reset system for a mechanical chronograph watch. Brief summary of the invention

[0029] One aim of the present invention is to provide a chronograph watch free from the limitations of known chronograph watches.

[0030] Another aim of the invention is to offer a chronograph watch which allows the user to have more or less precise information (i.e. with improved resolution) for one or more subsets of the set of desired indications, with better readability of known solutions.

[0031] Another aim of the invention is to offer an alternative chronograph watch to known solutions.

[0032] According to the invention, these goals are achieved in particular by means of the chronograph watch according to claim 1.

[0033] The chronograph watch according to the invention comprises a clockwork mechanism, the clockwork mechanism comprising: - a moving object of current time, comprising an axis and arranged to rotate (permanently) around this axis, - a first moving part, comprising a first axis and arranged to be connected to the moving part of the current time and to rotate around this first axis with a constant rotational speed, - an indicator body, - a second moving part, arranged to mesh with the first moving part, and to be connected to the indicating organ, - an element bearing a scale comprising a set of indications, this indicator body allowing information to be displayed on this scale, for example temporal or auxiliary information.

[0034] In this context, the term "moving" refers to a watch component that moves or shifts, particularly with a rotational movement around an axis. In this context, a moving component can be a wheel, a cam, etc.

[0035] According to the invention, the first moving part and the second moving part are arranged so as to obtain a gear ratio between the first moving part and the second moving part which varies according to their relative angular position, so that the indicating organ rotates with a variable rotational speed in correspondence with at least a subset of the set of indications of the scale.

[0036] Thanks to the fact that the indicating organ rotates with a variable rotation speed, corresponding to at least a subset of the scale's indications, it is possible to design several scales that are more readable compared to known solutions, while allowing the display of more (or less) detailed information (or more or less precise, i.e. with a better or worse resolution) for one or more subsets of the relevant indications.

[0037] For example, it is possible to use a scale with a constant distance between each marking across the entire range of markings on the scale. Instead of using a scale with a variable distance between each marking, which works with an indicator that rotates at a constant speed, the mechanism according to the invention allows the use of a scale with a constant, and therefore more legible, distance, since the indicator rotates at a variable speed.

[0038] It is also possible to use a scale with a variable distance between each reading and the next, at least for a subset of the scale's readings. This scale, combined with the variable rotation speed of the mechanism according to the invention, makes it possible to have—corresponding to the subsets of readings of interest for the intended application—distances between each reading and the next (variable) that are larger than the corresponding distances of known solutions, thus providing better readability and resolution of the desired information compared to known solutions.This scale, combined with the variable rotation speed of the mechanism according to the invention, also allows us to have - in correspondence with subsets of indications which are not of interest for the application envisaged - distances between an indication and the successive one (variables) which have smaller dimensions than the corresponding distances of the known solutions.

[0039] In one embodiment, the scale bears time indications, for example indications of seconds, minutes or hours of current time, or indications of seconds, minutes or hours timed.

[0040] In one embodiment, the scale carries auxiliary indications, for example the scale is a tachymetric, pulsometric or telemetric scale.

[0041] In one embodiment, the clock mechanism carries both at least one scale bearing time indications and at least one scale bearing auxiliary indications, the two scales cooperating with the same indicating organ which rotates with a variable rotational speed, so that the user can read respectively auxiliary time information.

[0042] The scale for auxiliary indications can be carried by the same element that carries the scale for 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 for time indications and the bezel that for auxiliary indications).

[0043] According to the invention, the clockwork mechanism comprises: - an actuation device, and - a clutch mechanism, arranged to be able to connect, under the action of the actuation device, the moving part of the current time with the first moving part.

[0044] In one embodiment, the mechanism includes an input moving part, comprising an input axis and arranged to rotate about this input axis, the input moving part being arranged to be driven in rotation by the moving part of the current time. In this embodiment, the clutch mechanism is arranged to be able to connect, under the action of the actuation device, the moving part of the current time with the first moving part via the input moving part.

[0045] In one embodiment, the first mobile and the second mobile have the same shape defined by radii of different length, the first mobile and the second mobile being arranged so that the sum of the radii 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.

[0046] In one embodiment, the sum of these radii belongs to the range of 3 mm to 8 mm, preferably from 5 mm to 6 mm, in particular from 5.436 mm to 5.450 mm.

[0047] In one embodiment, the first and second mobile objects have the same perimeter. In another embodiment, the perimeter of the first mobile object is a multiple of the perimeter of the second mobile object. In yet another embodiment, the perimeter of the second mobile object is a multiple of the perimeter of the first mobile object.

[0048] In this context, the expression "perimeter of a mobile" refers to the primitive (or reference) perimeter of that mobile.

[0049] In one embodiment, the subset of scale indications in which the indicating member rotates with a variable rotational 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 moving and second moving is arranged so that the rotation of the second moving remains constant in correspondence with the second subset of scale indications.

[0050] In one embodiment, each of the first mobile and second mobile has the same shape (or the same profile).

[0051] In one embodiment, each of the first mobile and second mobile is a cam having a spiral shape.

[0052] In one embodiment, each of the first and second moving parts has a logarithmic spiral shape; namely, the shape defined by the vertices of the teeth of each moving part is a portion of a logarithmic spiral. In one embodiment, this logarithmic spiral shape is the same for both the first and second moving parts.

[0053] The logarithmic spiral shape of each moving part limits the speed variations of the indicating element, particularly over a specific period, for example, less than one minute from its start-up. The curve representing the speed of the indicating element over time during this period is therefore smooth, without peaks. The logarithmic spiral shape of each moving part also results in a curve representing the rotational torque of the indicating element over logarithmic time, and thus without peaks.

[0054] In one embodiment, each of the first mobile and second mobile comprises a mobile body and a set of teeth.

[0055] In one embodiment, each of the first and second moving parts includes at least one recess, in order to reduce its imbalance when resetting the indicator body.

[0056] In one embodiment, each mobile having a logarithmic spiral shape includes a first hollow and a second hollow.

[0057] In one embodiment, the first recess is defined by a first proximal portion of the body of the moving part, namely a portion close to the axis of rotation of the moving part, by a first portion of the teeth of the moving part and by a first arm, the first arm connecting one end of the first proximal portion of the body of the moving part to one end of the first portion of the teeth of the moving part.

[0058] In one embodiment, the second recess is defined by a second proximal portion of the body of the mobile (adjacent to the first proximal portion), by the first arm, by a second portion of the teeth of the mobile and by a second arm, the second arm connecting one end of the teeth to one end of the second proximal portion of the body of the mobile.

[0059] In one embodiment, the shape and / or dimensions of the first recess in the first mobile are different from the shape and / or dimensions of the first recess in the second mobile. In one embodiment, the shape and / or dimensions of the second recess in the first mobile are different from the shape and / or dimensions of the second recess in the second mobile.

[0060] In one embodiment, the shape and / or dimensions of the first arm of the first mobile are different from the shape and / or dimensions of the first arm of the second mobile. In one embodiment, the shape and / or dimensions of the second arm of the first mobile are different from the shape and / or dimensions of the second arm of the second mobile.

[0061] The logarithmic spiral shape of each moving part also allows for a greater maximum torque (of the driven part) compared to the maximum torque obtained with a circular shape for each moving part. In one embodiment, the logarithmic spiral shape of each moving part also allows for a maximum torque (of the driven part) that is three times that obtained with a circular shape for each moving part.

[0062] In one embodiment, when the user starts resetting the indicator element, the second moving part is no longer a driven moving part, but becomes a driving moving part. Indeed, during the reset, the second moving part drives the first moving part and, via the first moving part, also the input moving part.

[0063] In one embodiment, the watch mechanism includes a heart coaxial with the second moving part.

[0064] The maximum value of the rotational torque of the driven moving part is greater, obtained by the logarithmic spiral shape of the moving parts. combined with the friction of the input mobile, can cause a separation between the second mobile and the heart, thus creating a shift between the rotation of the heart and that of the second mobile and therefore a shift of the indicator organ relative to the dial when the clockwork mechanism is activated at start.

[0065] In one embodiment, the watch mechanism includes a means of connecting the second moving part to the mainspring, allowing them to be locked together and thus reducing or preventing any misalignment caused during resetting. In one embodiment, this connecting means includes a pin carried by the mainspring and arranged to be received by a through hole in the second moving part. In one embodiment, the first arm of the second moving part includes this through hole. In one embodiment, this through hole also serves as an indexing means for the mainspring.

[0066] In another embodiment, the second mobile and the core form a single piece, that is, a piece manufactured monolithically. This also allows the second mobile to be fixed to the core, and thus avoids any misalignment caused during the reset.

[0067] In one embodiment, the shape of the heart is optimized to compensate for the effects of the logarithmic spiral shape of the second moving part, to allow a reset of the indicator organ.

[0068] In one embodiment, the second mobile and / or the core includes a means for indexing the core, for example a through hole.

[0069] In the event of a (angular) play between the two moving parts, which allows the second moving part to rotate before it is driven by the first moving part, it is possible to observe a recoil of the indicator organ at the start of the chronograph watch, in particular a recoil of the order of magnitude of a few degrees (for example 3.5°) in the counter-clockwise direction with respect to the starting position of the indicator organ.

[0070] To reduce or eliminate this play, in one embodiment the clockwork mechanism also includes a means for limiting this play between the two moving parts. In one embodiment, the second moving part includes this means for limiting the play. In another embodiment, the second arm of the second moving part includes this means for limiting the play. In another embodiment, this means for limiting the play includes a protrusion of an arm of the second moving part, in particular the second arm of the second moving part.

[0071] In one embodiment, the teeth of the first moving part and / or the second moving part are arranged to reduce wobbling of the indicator organ.

[0072] In one embodiment, the element of the watch mechanism according to the invention is a dial or a portion of the dial.

[0073] In one embodiment, the element of the watch mechanism according to the invention is a bezel or a portion of a bezel. Brief description of the figures

[0074] Examples of implementation of the invention are given in the description illustrated by the accompanying figures, in which:

[0075] Figure 1 illustrates a top view of part of a movement for one embodiment of the chronograph watch according to the invention.

[0076] Figure 2 illustrates a perspective view of part of the clockwork mechanism of the chronograph watch in Figure 1.

[0077] Figure 3 illustrates a bottom view of the clockwork mechanism of Figure 2.

[0078] Figure 4 illustrates a top view of a clockwork mechanism according to another embodiment of the chronograph watch.

[0079] Figure 5A is a graph illustrating the variation over time of the rotational speed of the indicating organ of the clock mechanism according to an embodiment of the invention, compared to the constant speed of known solutions.

[0080] Figures 5B and 5C are also graphs illustrating the variation over time of the rotation speed of the indicating organ of the clock mechanism according to other embodiments of the invention.

[0081] Figure 6 illustrates a top view of an embodiment of a scale of the clockwork mechanism of the chronograph watch according to the invention, in particular of a 100 m tachymeter scale with a variable distance between an auxiliary indication and the successive one.

[0082] Figure 7 illustrates a top view of an embodiment of a scale of the clockwork mechanism of the chronograph watch according to the invention, in particular a 1000 m tachymeter scale with a variable distance between an auxiliary indication and the successive one.

[0083] Figure 8 illustrates a top view of an embodiment of a scale of the clockwork mechanism of the chronograph watch according to the invention, in particular a pulsometric scale for 30 pulsations with a variable distance between an auxiliary indication and the successive one.

[0084] Figure 9 illustrates a top view of an embodiment of a scale of the chronograph watch mechanism according to the invention, in particular a pulsometric scale for 15 pulsations with a variable distance between an auxiliary indication and the successive one.

[0085] Figure 10 illustrates a top view of an embodiment of a scale of the chronograph watch mechanism according to the invention, in particular of a telemeter scale with a variable distance between an auxiliary indication and the successive one. Example(s) of embodiment(s) of the invention

[0086] In the following description, provided by way of example, reference will be made to scales comprising several markings, the distance between one marking and the next being variable for at least a subset of the markings. It should be understood, however, that the invention is not limited to these embodiments, but also includes clockwork mechanisms comprising scales with several markings, the distance between one marking and the next being constant for the entire set of markings.

[0087] Figure 1 illustrates a top view of part of a 1000 movement for one embodiment of the chronograph watch according to the invention.

[0088] 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 display of the current time.

[0089] The operation of a 1000 chronograph movement (with or without a current time display) being known in itself, it will not be described in detail here. As a non-limiting example, the operation of the 1000 chronograph movement shown in Figure 1 is based on a column wheel 4 which is conventionally connected to rocker arms 5.

[0090] The clockwork mechanism, part of which is illustrated in figures 2 and 3, includes an input wheel 8, comprising an input shaft 10 and is arranged to rotate, preferably continuously, around this input shaft 10.

[0091] In the example shown in Figures 2 and 3, this input element 8 is driven in rotation by a current time element 7 of the kinematic chain used to count and display the current time. This kinematic chain connects a power source, for example a mainspring barrel, to a regulating organ and to the watch wheels, which are linked to the watch's indicators to display the current hour, minutes, and / or seconds. This current time element 7 could be, for example, a current seconds wheel, which is therefore arranged to rotate around its axis 70 at a constant speed, for example, one revolution per minute (or 6° per second). In the illustrated example, the input element 8 also rotates at a constant speed, for example, at the same speed of one revolution per minute.

[0092] A clutch mechanism is arranged to be able to connect, under the action of an actuation device, the input moving part 8 with the first moving part 1 of the mechanism according to the invention.

[0093] The clutch mechanism can be a horizontal or lateral clutch mechanism, a vertical clutch mechanism, an oscillating pinion clutch mechanism, etc. Since clutch mechanisms are well known, they will not be described here. As an example, Figures 2 and 3 illustrate a vertical clutch mechanism, comprising a flange 9. Following the user's action on a pusher (not shown) of the chronograph watch, an actuation device (not shown), comprising for example clamps (not shown), moves the flange 9 along the axis of rotation 10, thus engaging the input wheel 8 and the first wheel 1.

[0094] 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 feature of the invention and depends on the type of clutch chosen.

[0095] The first mobile 1 can thus rotate around the axis 10 with a constant rotational speed when it is connected to the input mobile 8 by the clutch mechanism.

[0096] In one embodiment, the rotational speed of the first moving part 1 is equal to that of the input moving part 8, for example, and is, without limitation, one revolution per minute. In another embodiment, the rotational speed of the first moving part 1 is different from that of the input moving part 8; for example, it is lower.

[0097] The first mobile 1 is therefore a leading mobile which is set in rotation around its axis of rotation 10 following an action by the user.

[0098] The clock mechanism 100 according to the invention also includes a second mobile 2, arranged to mesh with the first mobile 1, and to be connected to an indicating organ (not illustrated in figures 1 to 3).

[0099] The second moving part 2 is therefore a moving part driven by the first moving part 1. It is set in rotation around its axis of rotation 20.

[0100] The clockwork mechanism according to the invention also includes 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) bearing a scale comprising a set of indications, the indicating organ enabling the display of information on this scale, for example, time or auxiliary information (such as, for example, tachymetric, pulsometric, or telemetric information). Examples of auxiliary marking scales are illustrated in Figures 6 to 10, which will be discussed later. The scale generally has an arc-shaped or roughly circular form. Of course, the scale can have other shapes, for example, but not limited to, a spiral shape.

[0101] 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 according to their relative angular position, so that the indicating organ rotates with a variable rotational speed, in correspondence with at least a subset of the set of indications carried by the scale.

[0102] In particular, the indicating element rotates at a variable speed because it is connected to the second moving part 2, which rotates at a variable speed corresponding to at least a subset of the indications. In a preferred embodiment, the rotational speed of the second moving part 2 corresponds to that of the indicating element. In a preferred embodiment, the indicating element is mounted on the rotation axis 20 of the second moving part 2.

[0103] Thanks to the fact that the indicating organ 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 that are more readable compared to known solutions, while allowing the display of more (or less) detailed (or more or less precise) information for one or more subsets of the set of indications concerned.

[0104] 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.

[0105] In a preferred embodiment, this shape is defined by radii of different lengths, the first mobile 1 and the second mobile 2 being arranged so that the sum of the radii R1, R2 of each mobile 1, 2 in correspondence of the gearing of the two mobiles is constant, as seen for example in figure 1.

[0106] Advantageously, the sum of these radii R1 and R2 is equal to the center-to-center distance of 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.

[0107] In one embodiment, the sum of these radii R1 and R2 belongs to the range of 3 mm to 8 mm, preferably from 5 mm to 6 mm, in particular from 5.436 mm to 5.450 mm.

[0108] 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 yet another embodiment, the perimeter of the second mobile 2 is a multiple of the perimeter of the first mobile 1.

[0109] Thanks to the clockwork 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 information for the user, at least in the subset(s) of interest of the indications carried by the scale, according to the application concerned.

[0110] 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.

[0111] In one embodiment, an example of which can be seen in Figure 4, each of the first and second moving parts has a logarithmic spiral shape, namely the shape defined by the vertices of the teeth of each moving part is a portion of a logarithmic spiral SL1, SL2. In In one embodiment, this logarithmic spiral shape is the same for the first mobile and the second mobile.

[0112] The logarithmic spiral shape of each moving part limits the speed variations of the indicating element, particularly over a specific period, for example, less than one minute from its start-up. The curve representing the speed of the indicating element over time during this period is therefore smooth, without peaks. The logarithmic spiral shape of each moving part also results in a curve representing the rotational torque of the indicating element over logarithmic time, and thus without peaks.

[0113] In one embodiment, each of the first mobile 1 and second mobile 2 comprises a mobile body and a toothing.

[0114] In one embodiment, each of the first mobile 1 and second mobile 2 includes at least one recess, in order to reduce its imbalance during a reset of the indicator organ.

[0115] In one embodiment, each mobile having a logarithmic spiral shape includes a first recess (reference 12' for the first mobile 1 and reference 22' for the second mobile 2) and a second recess (reference 12" for the first mobile 1 and reference 22" for the second mobile 2).

[0116] In one embodiment, each first recess 12', 22' is defined by a first proximal portion 15, 25 of the body of the mobile 1 respectively 2, namely a portion close to the axis of rotation of the mobile, by a first portion 17, 27 of the teeth of the mobile and by a first arm 13, 23, the first arm connecting an end of the first proximal portion 15, 25 of the body of the mobile to an end of the first portion 17, 27 of the teeth of the mobile 1 respectively 2.

[0117] In one embodiment, each second recess 12", 22" is defined by a second proximal portion 16, 26 of the body of the mobile 1 respectively 2 (adjacent to the first proximal portion 15, 25), by the first arm 13, 23, by a second portion 18, 28 of the teeth of the mobile 1 respectively 2 and by a second arm 19, 29, the second arm 19, 29 connecting one end of the teeth to one end of the second proximal portion 16, 26 of the body of the mobile 1 respectively 2.

[0118] In one embodiment, the shape and / or dimensions of the first 12' recess of the first mobile 1 is / are different from the shape and / or dimensions of the first 22' recess of the second mobile 2. In one embodiment, the shape and / or dimensions of the second 12" recess of the first mobile 1 is / are different from the shape and / or dimensions of the second 22" recess of the second mobile 2.

[0119] In one embodiment, the shape and / or dimensions of the first arm 13 of the first mobile 1 is / are different from the shape and / or dimensions of the first arm 23 of the second mobile 2. In one embodiment, the shape and / or dimensions of the second arm 19 of the first mobile 1 is / are different from the shape and / or dimensions of the second arm 29 of the second mobile 2.

[0120] The logarithmic spiral shape SL1, SL2 of each moving part also allows for a greater maximum torque (of the driven part) compared to the maximum torque obtained with a circular shape for each moving part. In one embodiment, the logarithmic spiral shape SL1, SL2 of each moving part also allows for a maximum torque (of the driven part) that is three times that obtained with a circular shape for each moving part.

[0121] In one embodiment, when the user starts resetting the indicator, the second moving part 2 is no longer a mobile led, but becomes a leading mobile. Indeed, during the reset, the second mobile 2 leads the first mobile 1 and, via the first mobile, also the input mobile 8.

[0122] In one embodiment, the watch mechanism includes a heart 3 coaxial with the second mobile 2.

[0123] The greater maximum value of the rotational torque of the driven mobile obtained by the logarithmic spiral shape of the mobiles, combined with the friction of the input mobile, can cause a separation between the second mobile 2 and the heart 3, thus creating a shift between the rotation of the heart 3 and that of the second mobile 2 and therefore a shift of the indicator organ relative to the dial when the clock mechanism is activated at start.

[0124] In one embodiment, the watch mechanism includes a means of connecting the second moving part 2 and the core 3, allowing them to be locked together and thus preventing any misalignment caused during resetting. In one embodiment, this connecting means includes a pin 33, visible in Figure 4, carried by the core 3 and arranged to be received by a through hole in the second moving part 2. In the embodiment of Figure 4, the first arm 23 of the second moving part 3 includes this through hole 21. In one embodiment, this through hole 21 also serves as an indexing means for the core 3.

[0125] In another embodiment (not shown), the second mobile 2 and the core 3 form a single piece, that is, a piece manufactured monolithically. This also allows the second mobile 2 to be fixed to the core 3, and thus avoids any misalignment caused during the reset.

[0126] In one embodiment, the shape of the heart 3 is optimized to compensate for the effects of the logarithmic spiral shape of the second mobile 2, to allow a reset of the indicator organ.

[0127] In the event of a (angular) play between the two mobiles 1, 2, which allows a rotation of the second mobile 2 before it is driven by the first mobile 1, it is possible to observe a recoil of the indicator organ at the start of the chronograph watch, in particular a recoil of the order of magnitude of a few degrees (for example of 3.5°) in the counter-clockwise direction with respect to the starting position of the indicator organ.

[0128] In order to reduce or eliminate this play, in one embodiment the clock mechanism also includes a means for limiting this play between the two moving parts 1, 2. In the embodiment of figure 4, the second arm 29 of the second moving part 2 includes this means for limiting the play in the form of an extension 290 of the second arm 29.

[0129] In one embodiment, this projection 290 is arranged so that it comes into contact with the arm 19 of the first moving part 1, and in particular with the outer surface 191 of this arm 19, before the second moving part 2 is driven by the first moving part 1 via their respective teeth. The outer surface 191 of the arm 19 is the one distal to the opening 12".

[0130] In one embodiment, this projection 290 is a protrusion on the outer surface 291 of the arm 29, directed towards the first moving part 1. In one embodiment, this projection 290 has a humped or rounded shape. In one embodiment, the maximum height h of this projection 290 is less than the height of the teeth of the first moving part 1 and / or second moving part 2.

[0131] In one embodiment, this protrusion 290 is positioned so that it comes into contact with the end of the arm 19 which is distal to the center of rotation 10, namely the end of the arm 19 close to the teeth (and in particular an end tooth) of the first mobile 1. In one embodiment, this protrusion 290 is placed substantially in correspondence with the central part of the outer surface 291 of the arm 29.

[0132] In one embodiment, the protrusion 290 and the arm 29 form a single piece, namely a monolithically manufactured part. In another embodiment, the protrusion 290 and the arm 29 are two separate parts, connected to each other by means of (movable or removable) fastening.

[0133] In another embodiment, the first and second mobile 1, 2 have a different shape from a spiral, and rather resemble a potato-shaped or toothed cam.

[0134] In general, the shape of the first and second mobile 1, 2 can be calculated by a calculation module, considering the desired rotation speed constraints in the subsets of the scale of interest and / or in the corresponding time interval, the constraint that the sum of the radii of each mobile corresponding to the gearing of the two mobiles is constant, the sum of these radii 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.

[0135] In one embodiment, the clockwork mechanism according to the invention comprises a heart 3 coaxial with the second mobile 2 (visible in figures 2 and 3).

[0136] In one embodiment, the second mobile 2 and / or the core 3 includes means for indexing this core, for example the through hole 21 of Figure 2 (better seen in Figure 2) respectively the through hole 31 of Figure 3, which must be aligned in order to allow this indexing.

[0137] In one embodiment, the teeth of the first moving part and / or the second moving part are arranged to reduce wobbling of the indicator organ.

[0138] In the embodiment where the first moving part 1 rotates at a speed that allows it to measure 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 allows it to drive, for example by means of a spring, the rotation of another moving part of the timekeeping mechanism, for example, the minute moving part. In turn, the minute moving part can be connected to an element similar to the plate 6 of Figure 2, which allows it to drive the rotation of another moving part of the timekeeping mechanism in a similar way, for example, the hour moving part.

[0139] When the user starts the rotation of the indicator organ, the input mobile 8 drives the first mobile 1 and therefore the second mobile 2. In one embodiment, when the user starts the reset of the indicator organ, the second mobile 2 - via the first mobile 1 - drives the input mobile 8, following the action of a hammer (not shown) on the heart 3.

[0140] Figure 5A is a graph illustrating the variation over time of the rotational speed v of the indicating element of the watch mechanism according to an embodiment of the invention, relative to a constant speed of known solutions, which is generally 6° per second. In the example shown, the rotational speed, greater than 6° per second at the start of the indicating element, decreases according to a decay law, for example a logarithmic decay law, in the range 0 - ts, ts being, for example, 60 seconds.

[0141] Figures 5B and 5C are also graphs illustrating the variation over time of the rotation speed of the indicating organ of the clock mechanism according to other embodiments of the invention.

[0142] In the example in Figure 5B, the rotational speed decreases according to a first law in the range 0 - ti (which corresponds for example to a first subset of the set of indications), it remains constant in the range ti - 12 (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 - ts (which corresponds for example to a third subset of the set of indications).

[0143] In the example in Figure 5C, the rotation speed increases in the range 0 - ti (which corresponds for example to a first subset of the set of indications), it remains constant in the range ti - 12 (which corresponds for example to a second subset of the set of indications) and it decreases in the range t2 - ts (which corresponds for example to a third subset of the set of indications).

[0144] The clockwork mechanism according to the invention thus makes it possible to design several speed profiles for the indicating organ. This, combined with a scale of indications (temporal or auxiliary) having a constant or variable distance between one indication and the next, allows the user to have more or less detailed information for one or more subsets of the desired set of indications, with improved legibility of the known solutions.

[0145] In one embodiment, the scale of the mechanism according to the invention is a time scale, bearing indications of elapsed time, for example, seconds, minutes, or hours. In one embodiment, the first and second moving parts are arranged so as to allow the user to read the time more precisely, at least within a subset of the indications displayed on this scale. In a preferred embodiment, this subset corresponds to the interval from 0 seconds to 10 seconds of elapsed time.

[0146] In one embodiment, the clockwork mechanism according to the invention carries a tachymeter scale.

[0147] Figure 6 illustrates a top view of an embodiment of a tachymeter scale 100 of the clockwork mechanism according to the invention. In this embodiment, the mechanism according to the invention also includes a chronometer scale 300, for example, chronometered seconds.

[0148] In the embodiment of Figure 6, the 100 tachymeter scale and the 300 chronometer seconds scale share the same graduation signs, the numerical values ​​of the 100 tachymeter scale being arranged on an outer arc of a circle and those of the 300 chronometer seconds scale being arranged on an inner arc of a circle, the two arcs of a circle having the same center 20.

[0149] This 100-meter tachymeter scale is particularly suitable for an athlete running a 100-meter distance and indicates average speed over that distance, measured in km / h. It includes an initial auxiliary reading 101 of 100 km / h (this value is not exhaustive), a final auxiliary reading 102 of 10 km / h (also not exhaustive), and intermediate auxiliary readings in between. Of course, the initial, final, and intermediate auxiliary readings are given as examples only and are not exhaustive. This applies to all the scales illustrated in Figures 6 to 10.

[0150] As can be seen in Figure 6, the auxiliary speed limit signs have a variable distance between each sign and the next. In the example shown, they are spaced 10 km / h apart in the subset between 100 km / h and 80 km / h, with the distance between each sign and the next in this first subset increasing progressively; and 5 km / h apart in the subset between 80 km / h and 40 km / h, with the distance between each sign and the next in this second subset decreasing. the whole being also increasingly large, and they are finally spaced 1 km / h apart in the subset between 40 km / h and 10 km / h, the distance between one indication and the successive one in this third subset being increasingly large.

[0151] The 100 scale has an arc-shaped form, with its center corresponding to the rotation axis 20. The indicating organ, which is arranged to rotate around the rotation axis 20, has one end at the 12 o'clock position when at rest. Corresponding to this angular position, indicated by reference 201, the 300 chronometer scale generally bears an initial indication of the chronometer time (not shown), for example, 0 seconds.

[0152] When a first pressure is applied to a pusher (or other control device) of the chronograph watch, the indicator organ starts up with a rotational movement whose direction is indicated by arrow A.

[0153] The first and second moving parts 1 and 2 which cooperate with the scale 100 of figure 6 in one embodiment are arranged so that the indicating member rotates with a decreasing speed as the indicating member rotates.

[0154] In this embodiment, the first and second mobile 1, 2 can have a spiral shape, for example a logarithmic spiral.

[0155] A second press on the same button or on another button has the effect of stopping the indicating organ at the precise point where it was located when that button was pressed.

[0156] The 100 scale in Figure 6, combined with the variable rotational speed of the mechanism according to the invention, makes it possible to have – corresponding to subsets of indications of interest for the envisaged application - distances between an indication and the successive one (variables) which have larger dimensions than the corresponding (also variable) distances of the known solutions, which allows a readability and resolution of the desired information in correspondence with the stopping point of the indicating organ which are better compared to the known solutions.

[0157] This scale of 100, combined with the variable rotation speed of the mechanism according to the invention, also allows us to have - in correspondence with subsets of indications which are not of interest for the intended application - distances between an indication and the successive one (variable) which have smaller dimensions than the corresponding (also variable) distances of the known solutions.

[0158] This allows for a parameterized level of detail for the different subsets according to the application of interest, while also allowing for better readability of the desired information compared to known solutions.

[0159] As can be seen in Figure 6, the indications of the timed time scale 300 also have a variable distance between one indication and the successive one.

[0160] The initial reading 301 of the timed time scale 300 in the embodiment of Figure 6 is offset from the initial reading 101 of the tachymeter scale 100, and the final reading 302 of the timed time scale 300 shares the same graduation sign as the final reading 102 of the tachymeter scale 100. However, this embodiment is not exhaustive, and any other arrangement of the readings of the two scales may be considered. This also applies to the embodiments of Figures 6 to 10.

[0161] The 300-second time scale in Figure 6, combined with the variable rotation speed of the mechanism according to the invention, It also allows us to have - in correspondence with subsets of indications of interest for the intended application - distances between an indication and the successive one (variables) which have larger dimensions than the corresponding (also variable) distances of the known solutions, which allows for a readability and resolution of the desired information in correspondence with the stopping point of the indicating organ which are better compared to the known solutions.

[0162] Figure 7 illustrates a top view of an embodiment of a 100 scale of the clockwork mechanism according to the invention, in particular a 1000 m tachymeter scale. In this embodiment, the mechanism according to the invention also includes a 300 chronometer scale, for example chronometered seconds.

[0163] In the embodiment of Figure 7 also, the 100 tachymeter scale and the 300 chronometer seconds scale share the same graduation signs, the numerical values ​​of the 100 tachymeter scale being arranged on an outer arc of a circle and those of the 300 chronometer seconds scale being arranged on an inner arc of a circle, the two arcs of a circle having the same center 20.

[0164] This tachometer scale 100 is particularly suitable for a car traveling a distance of 1000 m (for example, between two motorway interchanges) and displays average speed over that distance, measured in km / h. It has an initial auxiliary marking 101 of 400 km / h, a final auxiliary indication 102 of 60 km / h and intermediate auxiliary indications between the two.

[0165] As can be seen in Figure 7, the auxiliary speed indicators are spaced 10 km / h apart in the subset between 400 km / h and 200 km / h, with the distance between one indicator and the next increasing in this first subset, and 5 km / h apart in the subset between 200 km / h and 60 km / h, with the distance between an indicator and the successive one in this second subset is also increasingly larger.

[0166] The 100 scale has an arc-shaped circular form, with its center corresponding to the rotation axis 20. The indicator organ, which is arranged to rotate around the rotation axis 20, at rest has one end corresponding to 12 o'clock, where there is also the auxiliary final indication 102.

[0167] When a first pressure is applied to a pusher (or other control device) of the chronograph watch, the indicator organ starts up with a rotational movement whose direction is indicated by arrow A.

[0168] The first and second moving parts 1 and 2 which cooperate with the scale 100 of figure 7 in one embodiment are arranged so that the indicating member rotates with a decreasing speed as the indicating member rotates.

[0169] In this embodiment, the first and second mobile 1, 2 can in this case also have a spiral shape, for example a logarithmic spiral.

[0170] A second press on the same button or on another button has the effect of stopping the indicating organ at the precise point where it was located when that button was pressed.

[0171] As with the scale in Figure 6, the 100 scale in Figure 7 has a level of detail customized for the different subsets according to the application of interest, while allowing better readability of the desired information compared to known solutions.

[0172] As with the scale in Figure 6, the timed time scale 300 in Figure 7 has a level of detail customized for different subsets, while allowing better readability of the desired information compared to known solutions.

[0173] Figure 8 illustrates a top view of an embodiment of a 100-scale clockwork mechanism according to the invention, in particular a pulsometer scale for 30 beats. This 100-scale is particularly suitable for calculating the heart rate of an athlete. In this embodiment, the mechanism according to the invention also includes a 300-scale chronometer, for example, chronometered seconds.

[0174] In the embodiment of Figure 8 also, the pulsometric scale 100 and the chronometric seconds scale 300 share the same graduation signs, the numerical values ​​of the pulsometric scale 100 being arranged on an outer arc of a circle and those of the chronometric seconds scale 300 being arranged on an inner arc of a circle, the two arcs of a circle having the same center 20.

[0175] This pulse rate scale 100 indicates heart rate, measured in beats per minute (pulse / min). It includes an initial auxiliary reading 101 of 200 pulses / min, a final auxiliary reading 102 of 41 pulses / min, and intermediate auxiliary readings between the two.

[0176] As can be seen in Figure 8, the auxiliary indications are spaced 10 bpm apart in the subset between 200 bpm and 140 bpm, with the distance between one indication and the next increasing in this first subset; 5 bpm apart in the subset between 140 bpm and 80 bpm, with the distance between one indication and the next increasing in this second subset; and 1 bpm apart in the subset between 80 bpm and 41 bpm. successive in this third subset being also increasingly larger.

[0177] The 100 scale has an arc-shaped form, with its center corresponding to the rotation axis 20. The indicating organ, which is arranged to rotate around the rotation axis 20, has one end at the 12 o'clock position when at rest. Corresponding to this angular position, indicated by reference 201, the 300 chronometer scale generally bears an initial indication of the chronometer time (not shown), for example, 0 seconds.

[0178] When a first pressure is applied to a pusher (or other control device) of the chronograph watch, the indicator organ starts up with a rotational movement whose direction is indicated by arrow A.

[0179] The first and second moving parts 1 and 2 which cooperate with the scale 100 of figure 8 in one embodiment are arranged so that the indicating member rotates with a decreasing speed as the indicating member rotates.

[0180] In this embodiment, the first and second mobile 1, 2 can have a spiral shape, for example a logarithmic spiral.

[0181] A second press on the same button or on another button has the effect of stopping the indicating organ at the precise point where it was located when that button was pressed.

[0182] The scale 100 of figure 8, 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 than the distances corresponding to known solutions, which allows for better readability and resolution of the desired information in correspondence to the stopping point of the indicator organ compared to known solutions.

[0183] This scale of 100, combined with the variable rotation speed of the mechanism according to the invention, also allows us to have - in correspondence with subsets of indications which are not of interest for the application envisaged - distances between an indication and the successive one (variables) which have smaller dimensions than the corresponding distances of the known solutions.

[0184] This allows for a parameterized level of detail for the different subsets according to the application of interest, while also allowing for better readability of the desired information compared to known solutions.

[0185] The timed time scale 300 in Figure 8 also has a customized level of detail for different subsets, while allowing better readability of the desired information compared to known solutions.

[0186] Figure 9 illustrates a top view of an embodiment of a 100-scale clockwork mechanism according to the invention, in particular a pulsometer scale for 15 beats. This 100-scale is also particularly suitable for calculating the heart rate of an athlete. In this embodiment, the mechanism according to the invention also includes a 300-scale chronometer, for example, chronometered seconds.

[0187] In the embodiment shown in Figure 9, the pulsometer scale 100 and the chronometer scale 300 share the same graduation symbols, with the numerical values ​​of the pulsometer scale 100 being arranged on an outer arc of a circle and those of the scale of the 300 timed seconds being arranged on an inner arc of a circle, the two arcs of a circle having the same center 20.

[0188] This pulse rate scale 100 indicates heart rate, measured in beats per minute (pulse / min). It includes an initial auxiliary reading 101 of 200 pulses / min, a final auxiliary reading 102 of 40 pulses / min, and intermediate auxiliary readings between the two.

[0189] The same considerations made for the scale of figure 8 apply to that of figure 9.

[0190] Figure 10 illustrates a top view of an embodiment of a 100-scale clockwork mechanism according to the invention, in particular a telemeter scale. In this embodiment, the mechanism according to the invention also includes a 300-scale chronometer, for example, chronometered seconds.

[0191] In the embodiment of Figure 10 also, the 100 rangefinder scale and the 300 timed seconds scale share the same graduation signs, the numerical values ​​of the 100 rangefinder scale being arranged on an outer arc of a circle and those of the 300 timed seconds scale being arranged on an inner arc of a circle, the two arcs of a circle having the same center 20.

[0192] This 100-meter rangefinder scale is particularly suitable for calculating distances in meters. It features an initial auxiliary marker 101 of 0.10 m, a final auxiliary marker 102 of 20.00 m, and intermediate auxiliary markers in between. Of course, the initial, final, and intermediate auxiliary markers are given as examples only and are not exhaustive.

[0193] As can be seen in Figure 10, the auxiliary indications are spaced 0.10 km apart in the subset between 0.10 km and 1.00 km, the distance between one indication and the next in this first subset being constant, 0.25 km apart in the subset between 1.00 km and 5.00 km, the distance between one indication and the initial next in this second subset being variable and decreasing in the direction of arrow A, and 0.50 km apart in the subset between 5.00 km and 20.00 km, the distance between one indication and the next in this third subset being variable with another decrease in the direction of arrow A.

[0194] The indicating organ, which is arranged to rotate around an axis of rotation, which as a rule corresponds to the axis of rotation 20 of the second mobile 20 and which passes through the center of the circle whose arc carries the scale 100, at rest has one end corresponding to 12 o'clock.

[0195] When a first pressure is applied to a pusher (or other control device) of the chronograph watch, the indicator organ starts up with a rotational movement whose direction is indicated by arrow A.

[0196] The first and second moving parts 1 and 2 which cooperate with the scale 100 of figure 10 in one embodiment are arranged so that the indicating member rotates with a decreasing speed as the indicating member rotates.

[0197] In this embodiment, the first and second mobile 1, 2 can have a spiral shape, for example a logarithmic spiral.

[0198] Although Figures 6 to 10 show examples of scales bearing both specific auxiliary markings and temporal markings, the invention is not limited to such scales but also applies to scales lacking temporal markings or auxiliary markings, as well as other scales bearing other auxiliary and / or temporal indications or with a different arrangement than that illustrated in figures 6 to 10.

[0199] With the mechanism according to the invention, it is also possible to use a scale with a constant distance between one indication and the next. Reference numbers used in the figures First mobile Second mobile Heart Column wheel Rocker Plate Mobile current time Mobile entry Flask Axis of rotation of the first moving part ' First hollow of the first moving part " Second hollow of the first moving part First arm of the first mobile First proximal portion of the first mobile Second proximal portion of the first mobile First portion of the teeth of the first mobile Second portion of the teeth of the first mobile Second portion of the teeth of the first mobile Axis of rotation of the second moving part Indexing hole 'First recess of the second mobile' Second recess of the second mobile First arm of the second mobile indicator body First proximal portion of the second molar Second proximal portion of the second molar First portion of the dentition of the second molar Second portion of the dentition of the second molar Second arm of the second molar Indexing hole Pin Initial indication 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 indicator unit 191 Outer surface of the arm 19 201 Angular position of 12h 290 Outgrowth 291 Outer surface of the arm 29 300 Time scale 301 Initial time indication 302 Final time indication 1000 Movement A Direction of rotation of the indicator organ h Maximum height of the protrusion R1 Radius of the first moving part corresponding to the gear with the second moving part R2 Radius of the second moving part corresponding to the gear with the first moving part SLi First logarithmic spiral form Sl_2 Second logarithmic spiral form ti Time v Rotation speed of the indicator organ

Claims

Demands 1. Chronograph watch comprising a clockwork mechanism, the clockwork mechanism comprising: - a moving part of the current time (7), comprising an axis (70) and being arranged to rotate about this axis (70), - a first moving part (1), comprising a first axis (10) and arranged to be connected to the moving part of the current time (7) and to rotate around this first axis (10) with a constant rotational speed, - an indicator organ (24), - a second moving part (2), arranged to mesh with the first moving part (1), and to be connected to said indicator part (24), - an element bearing a scale (100) comprising a set of indications, said indicator body enabling information to be displayed on this scale, - an actuation device, - a clutch mechanism (9), arranged to be able to connect under the action of the actuation device the current time moving part (7) with the first moving part (1), characterized in that the first moving part (1) and the second moving part (2) are arranged so as to obtain a gear ratio between the first moving part (1) and the second moving part (2) which varies according to their relative angular position, so that the indicating member (24) rotates with a variable rotational speed in correspondence with at least a subset of said set of indications.

2. Chronograph watch according to claim 1, comprising: - an input moving part (8), comprising an input axis and being arranged to rotate about this input axis, the input moving part being arranged to be driven in rotation by the current time moving part (7), the clutch mechanism (9) being arranged to be able to connect under the action of the actuation device the current time moving part (7) with the first moving part (1) via the input moving part (8).

3. Chronograph watch according to any one of claims 1 to 2, the scale (100) comprising several indications, the distance between one indication and the successive one being constant for the whole set of indications.

4. Chronograph watch according to claim 1 to 2, the scale (100) comprising several indications, the distance between an indication and the successive one being variable at least for a subset of said set of indications.

5. Chronograph watch according to any one of claims 1 to 4, the scale (100) being a tachymetric, pulsometric or telemetric scale.

6. Chronograph watch according to any one of claims 1 to 5, the first moving part (1) and the second moving part (2) having the same shape.

7. Chronograph watch according to claim 6, said form being defined by radii of different length, the first mobile (1) and the second mobile (2) being arranged so that the sum of the radii 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.

8. Chronograph watch according to claim 7, the sum of the radii belonging to the range of 3 mm to 8 mm, preferably from 5 mm to 6 mm, in particular from 5.436 mm to 5.450 mm 9. Chronograph watch according to any one of claims 1 to 8, 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 and second moving parts being arranged so that the rotation of the second moving part remains constant, corresponding to the second subset of scale indications.

10. Chronograph watch according to any one of claims 1 to 9, wherein the first moving part (1) and the second moving part (2) have a logarithmic spiral shape.

11. Chronograph watch according to any one of claims 1 to 10, wherein each of the first mobile (1) and second mobile (2) comprises at least one recess (12', 12"; 22', 22"), in order to reduce their imbalance during a reset of the indicator organ (24).

12. Chronograph watch according to any one of claims 10 to 11, comprising a core (3) coaxial with the second mobile (2), and a linking means (33) between the second mobile (2) and the core (3), allowing them to be joined together, and thus reducing or avoiding any shift caused during a reset.

13. Chronograph watch according to claim 12, the linking means comprising a pin (33) carried by the heart (3) and arranged to be received by a through hole (21) of the second mobile (2).

14. Chronograph watch according to any one of claims 10 to 13, comprising a means for limiting play between the first moving part (1) and the second moving part (2) which allows rotation of the second moving part (2) before it is driven by the first moving part (1).

15. Chronograph watch according to claim 14, the second moving part (2) comprising the means for limiting the play.

16. Chronograph watch according to claim 15, the means for limiting the play being an outgrowth of an arm (29) of the second mobile (2).

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