EP3495898A1 - Mechanism for stop-watch movement - Google Patents

Abstract

The invention relates to a mechanism for a chronograph watch movement comprising: - a time counter wheel (2), different from the second chronograph wheel (3), - an oscillating pinion (10) comprising: - a first toothing (110) arranged to mesh with an energy source (1, 1 ') of the movement, - a second toothing (120) arranged to move under the action of an actuating device (210, 220), so as to mesh with the counter wheel of a determined time (2), thereby producing a oscillating pinion clutch between the energy source (1, 1 ') and the counter wheel of a determined time (2 The mechanism according to the invention aims to separate the movement of the counter wheel for a determined time (2) from that of the second chronograph wheel (3) using an oscillating pinion (10).

Description

Technical area

The present invention relates to a mechanism for chronograph watch movement. The present invention also relates to a chronograph watch movement comprising such a mechanism, as well as a chronograph watch, in particular a wristwatch chronograph watch, comprising such a movement.

State of the art

A chronograph watch is a time device that allows a measurement of duration. On the other hand, the chronometer is a precision time machine. A chronograph may or may not be a chronometer.

As a rule, a chronograph watch is a watch having at least one indicator such as a needle which can be turned on and off by means of a pushbutton or other control device in order to measure a duration. . Then it can be brought back to its starting point. Many chronographs also have indicators for displaying the current time in addition to displaying the measured duration.

When a first press on a pusher (or another control device) of a chronograph watch, the indicator or second-hand needle (also called "second chronograph indicator" or "second chronograph hand"), which is at rest on the zero division of the dial, starts up ("START" phase). A second pressure on the same pusher or on another pusher has the effect of stopping the second hand at the precise point where it was during this pressure (phase "STOP"). By a third pressure, on the same push or another, the second hand quickly returns to its starting point, that is to say on the zero division of the dial (phase "RESET"). In this way, it is possible to measure a duration in seconds.

The three phases or functions of a chronograph watch are therefore the start or start, the stop or stop and the reset or reset.

The phases of "STOP" and "RESET" are generally controlled by another pushbutton than that dedicated to the "START" phase.

A possible known chronograph mechanism is that with the column wheel that uses two pushers or control devices, one for the "START" and "STOP" functions, the other for the reset ("RESET").

To achieve these various operations, several systems have been developed, simple or complex depending on what you want to display and how. A large number of combinations and variants of mechanisms have been made depending on the type of control and display desired.

The usual chronograph watches take the energy necessary for the operation of the part of the movement allowing the measurement of a duration, on the kinematic chain making it possible to count and display the current time, that is to say on the chain kinematic linking a power source, for example a cylinder, to the regulating member and to the wheels of the watch, which are linked to the indicators of the watch in order to display the hours, minutes and / or seconds current.

In the context of the present invention, the word "wheel" indicates a mobile which can be rotated and which allows a clutch with a toothing of another mobile. In a variant Preferably, a wheel is a gear wheel. Such a wheel is generally linked to an indicator, for example a needle.

In the context of the present invention, the word "counter" indicates a means providing information relating to a counted duration. More precisely, a dial and an indicator form a counter.

In order to take this energy necessary to set the kinematic chain in motion for the measurement of a time duration, it is necessary to make a clutch between the kinematic chain linking an energy source (for example a barrel) to the regulating member and that which makes it possible to measure a temporal duration.

Two main organs are used in the majority of the operations of the chronograph watch mechanisms, namely control devices and clutch devices.

The control devices may be cam or column wheel. As they are known per se in the field of technology, they will not be described here.

Known clutch devices can engage the seconds wheel of the current time (also called "second movement wheel" or "seconds wheel") to the second chronograph wheel. The second chronograph wheel is used to drive a seconds indicator that makes a full turn of the dial when the time has reached an integer of seconds, in most cases sixty seconds.

Then, the second chronograph wheel causes, for example by means of a gear train, other wheels that can count a time timed, usually a wheel of chronograph minutes, or even a chronograph hour wheel.

In other words, the energy from the "basic movement", that is to say the movement that displays the current time (seconds, minutes and / or hours) is then redistributed to the different wheels that allow to count a time timed directly by the second chronograph wheel.

Various types of clutch devices, including vertical and horizontal clutch devices, are known.

Vertical clutch devices allow a so-called "vertical" clutch between the two kinematic chains, in particular between a wheel of a kinematic chain (that which makes it possible to determine the current time) and a wheel of the other kinematic chain (that which allows to measure a duration).

In the case of a vertical clutch, the transmission of energy is not done by teeth, but by friction, for example on the faces of the wheels. The advantage of this type of clutch is that the drive of the counter that allows the measurement of a time duration is without starting jump. This clutch is compact and well suited for high volume productions. On the other hand, it is expensive because of the high number of pieces and its development remains rather difficult.

Documents CH705988 and CH709162 describe a vertical type clutch.

Lateral or horizontal clutch devices make it possible to couple two wheels by putting them in contact by their periphery (toothing). The disadvantage of this type of clutch is that during the training of the counting wheel of a timed time it is possible to have a jump departure due to misalignment of the teeth of the two wheels. The gap is all the smaller as there are teeth. However teeth with many teeth are difficult to manufacture and more prone to wear. In this type of device, there is no movement of oscillation or tilting of the elements of these devices.

The document EP2570869 describes a lateral or horizontal clutch device.

There are also oscillating gear clutch devices, which allow transmission of energy from the seconds wheel to that of the second chronograph by means of an oscillating pinion. This oscillating pinion has a first toothing which is in permanent contact with the seconds wheel. This oscillating pinion, under the action of an actuating device such as a rocker, oscillates or tilts, so that its second toothing comes into contact with the wheel of the second chronograph, thereby also rotating it .

CH700808 discloses a swing pinion clutch device between the second movement wheel and the second chronograph wheel.

As mentioned, the energy of the second chronograph wheel is then redistributed to the different wheels that allow the measurement of a duration, including the chronograph minute wheel and the chronograph hour wheel.

However, the second chronograph wheel is one of the components with the least energy. Thus, any disturbance on this wheel, for example disturbances related to the fact that this wheel drives the chronograph minute wheels and chronograph hours, will have consequences on the operation of the various other mechanisms of the basic movement that allows to measure and display the current time, the second chronograph wheel is linked via the second movement wheel. For example, any disturbance on the second chronograph wheel will have consequences on the accuracy of the basic movement, the power reserve of the basic movement, etc.

In addition, in the mechanisms for chronograph watch movement known, the setting or the focus of the chronograph minute wheels and / or chronograph hours is complicated, because of their dependence on the second chronograph wheel.

Finally, the arrangement of mechanisms for chronograph watch movement known leads to a large footprint, which is undesirable in the case of certain movements of a chronograph watch.

The document EP2073079 relates to a column wheel type chronograph mechanism, in which the column wheel cooperates with a clutch rocker carrying a clutch return and is pivotally mounted on the plate between a first rest position and a second position of the clutch. training of a chronograph wheel, from a finishing train, via the chronograph wheel meshing or not with the clutch return. This document describes that an additional clutch rocker can be provided to drive the hours mobile, for example from the average wheel. The minute counter is driven from the seconds counter in a conventional manner.

The document CH527462 relates to a chronograph watch in which the mechanism of the chronograph, in its almost all, is carried by an independent frame removably attaching to the frame of the movement. This mechanism includes a swing pinion clutch between the chronograph wheel and the seconds wheel of the movement.

Brief summary of the invention

An object of the present invention is therefore to provide a mechanism for chronograph watch movement that is less sensitive to disturbances compared to known mechanisms.

Another object of the present invention is therefore to provide a mechanism for chronograph watch movement in which the development of wheels minutes and / or hours is less complicated.

Another object of the present invention is therefore to provide a mechanism for chronograph watch movement which generates less space than the known mechanisms.

Another object of the present invention is therefore to provide a mechanism for chronograph watch movement free from the limitations of known mechanisms.

• une source d'énergie,
• une roue des secondes chronographe,
• une roue de compteur d'un temps déterminé, différente de la roue des secondes chronographe,
• un dispositif d'actionnement d'un pignon oscillant, et
• ce pignon oscillant qui comprend :
  • une première denture arrangée pour engrener avec la source d'énergie du mouvement,
  • une deuxième denture arrangée pour se déplacer sous l'action du dispositif d'actionnement de façon à engrener avec la roue de compteur d'un temps déterminé, en réalisant ainsi un embrayage à pignon oscillant entre la source d'énergie et la roue de compteur d'un temps déterminé.

According to the invention, these objects are attained in particular by means of a mechanism for chronograph watch movement comprising:

• a source of energy,
• a second chronograph wheel,
• a counter wheel of a determined time, different from the wheel of the second chronograph,
• a device for actuating an oscillating gear, and
• this oscillating pinion which includes:
  • a first set of teeth arranged to mesh with the energy source of the movement,
  • a second set of teeth arranged to move under the action of the actuating device so as to mesh with the counter wheel for a predetermined time, thus achieving a swinging gear clutch between the energy source and the counter wheel a certain time.

According to the invention, the counter wheel of a given time is thus driven solely by the energy source via the oscillating pinion, so that the rotation of the second chronograph wheel is not disturbed by the rotation of the counter wheel of a certain time.

In other words, the mechanism according to the invention makes it possible to dissociate the function of the wheel of the second chronograph from that of the counter of a given time, for example a counter of minutes or timed hours, in order not to disrupt the movement of the basic movement when the chronograph is engaged.

The mechanism according to the invention thus makes it possible to separate the movement (or rotation) of the second chronograph wheel from that (or that) of the counter wheel by a predetermined time. In other words, the second chronograph wheel of the mechanism according to the invention no longer causes the counter wheel of a predetermined time. This also means that in the mechanism according to the invention there is never any contact between the second chronograph wheel and the counter wheel of a predetermined time. In other words, the transmission chain or kinematic chain of the mechanism according to the invention connects the second chronograph wheel and the counter wheel of a given time, only via the energy source and no other path.

In addition, since the oscillating gear enables a swing pinion clutch between the power source and the counter wheel for a predetermined time, the energy to drive the counter wheel by a determined time is taken from a source of power. energy that has more energy than the second chronograph wheel. Consequently, the disturbances on this energy source will have no effect on the counter wheel for a given time, or will have a much lower incidence than the state of the art based on the second wheel energy chronograph. Finally, the disturbances on this energy source will not no impact on the regulating organ of the basic movement, or will have a much lower incidence than that of the state of the art.

In other words, the counter wheel of a certain time is no longer driven by the second chronograph wheel. It takes its energy from a source of energy providing it with much greater energy than that provided by the second chronograph wheel, and therefore less sensitive to disturbances.

In the context of the present invention, the expression "energy source" indicates a barrel or a linked intermediate mobile, in particular directly connected to the barrel, that is to say in contact with a barrel.

It is therefore clear that a mobile that is connected to the barrel via a chain of other mobiles, for example via a gear train, is not a source of energy in this context. For example, the second movement wheel is not a source of energy as defined in the context of this invention.

As explained above, the invention therefore aims to separate the movement of the counter wheel by a certain time from that of the second chronograph wheel by means of an oscillating pinion which is arranged between this counter wheel. of a determined time and this second chronograph wheel. This separation and the presence of the oscillating pinion makes it possible to simplify the development and the operation of the counter wheel by a predetermined time, since this counter wheel of a given time is no longer driven by the wheel of the wheels. second chronograph. In addition, the oscillating pinion allows better access to the counter wheel of a given time.

This separation and the presence of the oscillating pinion also allow a compact layout while to significantly reduce the starting jump to the counter wheel by a certain time.

According to the invention, this counter wheel of a predetermined time is a chronograph minute wheel. In other words, the counter wheel of a predetermined time is a counter wheel N minutes, N being a positive integer. For example, it is a counter wheel sixty minutes (N = 60): it allows to drive a chronograph minute indicator that makes a full turn of a dial when the time has reached sixty minutes. In another variant, it is a counter wheel thirty minutes (N = 30): it allows to drive a chronograph minute indicator that makes a full turn of a dial when the time has reached thirty minutes. Any other integer N could be considered, in particular N = 45.

In an unclaimed variant, this counter wheel of a predetermined time is a chronograph hour wheel. In other words, in this variant, the counter wheel of a predetermined time is a counter wheel M hours, M being a positive integer. For example, it is a twelve-hour counter wheel (M = 12): it allows to drive a chronograph hour indicator that makes a complete turn of a dial when the measured time reaches twelve hours. Any other integer number M could in principle be considered.

The mechanism according to the invention offers a large number of possibilities for the counters N minutes and / or M hours, since N and M can be chosen as a function of the gear ratios between the energy source and the counter wheel. a determined time, the number of teeth of the energy source and / or the counter wheel of a given time, and / or according to their distances.

According to an independent aspect of the invention, the counter wheel of a predetermined time is replaced by a downward wheel.

• une roue des secondes mouvement,
• une roue des secondes chronographe,
• un deuxième pignon oscillant.

In a preferred variant, the oscillating gear is a first oscillating gear and the actuating device is a first actuating device. In this variant, the mechanism according to the invention also comprises:

• a wheel of the second movement,
• a second chronograph wheel,
• a second oscillating gear.

• une première denture arrangée pour engrener avec la roue des secondes mouvement;
• une deuxième denture arrangée pour se déplacer sous l'action du premier dispositif d'actionnement ou d'un deuxième dispositif d'actionnement, de façon à engrener avec la roue des secondes chronographe, en réalisant ainsi un embrayage à pignon oscillant entre la roue des secondes mouvement et la roue des secondes chronographe.

This second oscillating gear comprises:

• a first set of teeth arranged to mesh with the wheel of the second movement;
• a second set of teeth arranged to move under the action of the first actuating device or a second actuating device, so as to mesh with the wheel of the second chronograph, thus realizing an oscillating pinion clutch between the wheel of the second movement and the seconds wheel chronograph.

The mechanism according to the invention in this variant thus comprises two oscillating gears. In this variant, the number of teeth of the second toothing of the first oscillating gear may be equal to the number of teeth of the second toothing of the second oscillating gear, which further simplifies the adjustment of the mechanism according to the invention. In other variants, the number of teeth of the second toothing of the first oscillating gear may be smaller or greater than the number of teeth of the second toothing of the second oscillating gear.

In a preferred embodiment, the counter wheel of a predetermined time is a first wheel and the mechanism according to the invention comprises a second counter wheel of a predetermined time. For example, if the first counter wheel of a given time is a chronograph minute wheel, the second wheel may be a chronograph hour wheel.

In this preferred embodiment, the mechanism comprises a third oscillating pinion making an oscillating pinion clutch between the energy source (or another energy source) and the second meter wheel of a predetermined time.

For example, the energy source is an intermediate mobile directly in contact with a cylinder, which can meshing with the second toothing of the first oscillating gear and with the second toothing of the third oscillating gear, thus permitting to rotate for example a chronograph minute wheel (cooperating with the first oscillating pinion) and a chronograph hour wheel (cooperating with the third oscillating pinion).

In another example, the energy source cooperating with the first oscillating gear is different from that cooperating with the third oscillating gear. For example, the energy source cooperating with the first oscillating gear is a first intermediate gear in contact with a first toothing of a double-toothed cylinder, and the energy source cooperating with the third oscillating gear is a second intermediate gear. contact with a second toothing of the double-toothed cylinder.

In a variant, this third oscillating gear is actuated by the first actuating device (for example a rocker that can actuate either the first oscillating gear only, or both the first and second oscillating gear).

In another variant, this third oscillating gear is actuated by the second actuating device which also actuates the second oscillating gear.

In yet another variant, this third oscillating gear is actuated by a third actuating device which does not actuate any other oscillating gear.

In any case, the third oscillating gear comprises a first set of teeth arranged to mesh with a source of energy of the movement and a second toothing arranged to move under the action of an actuating device (the first, the second or a third actuating device), so as to mesh with the second counter wheel by a predetermined time, thereby producing a swing pinion clutch between the energy source and the second counter wheel of a predetermined time.

Those skilled in the art therefore understand that it is possible to add a fourth counter wheel of a determined time associated with a fourth oscillating pinion, this fourth oscillating pinion being actuated by an actuating device which already actuates another pinion. oscillating, or by another actuating device, and realizing an oscillating pinion clutch between this fourth counter wheel and a movement energy source (for example a cylinder, an intermediate mobile directly connected to the barrel and already cooperating with a another oscillating pinion or another intermediate mobile directly connected to the barrel which cooperates only with the fourth oscillating pinion).

Those skilled in the art will also understand that it is possible to continue adding a fifth, sixth, etc. counter wheel of a determined time, each additional wheel being associated with a new oscillating gear, which new oscillating gear is actuated by an additional actuating device or by an actuating device which already actuates another oscillating gear, and realizing an oscillating pinion clutch between this wheel and an additional energy source (for example another intermediate mobile directly connected to the barrel which cooperates only with the additional oscillating pinion) or by a source of energy of the movement already cooperating with another swinging gear.

In a variant, the mechanism according to the invention comprises the first actuating device. This first actuating device can be arranged to control both the first and the second oscillating gear (and also any additional oscillating gear), which reduces the number of components of the mechanism and therefore its cost and bulk.

In another variant the mechanism according to the invention comprises a second actuating device which makes it possible to control the second oscillating gear, the first oscillating gear being actuated by the first actuating device.

In a variant, the first actuating device and / or the second actuating device (and / or any other additional actuating device cooperating with any other additional gear) is a flip-flop.

In a variant, the mechanism according to the invention comprises a control device actuating the first and / or the second actuating device and / or any other additional actuating device, this control device being for example a control device for cam and / or column wheel.

In a variant, the oscillating gear comprises more than two teeth on its axis. In this variant it is thus possible to achieve a double clutch with a single oscillating gear.

The invention also relates to a chronograph watch movement comprising the mechanism according to the invention.

In a variant, the mechanism according to the invention is a module that can be integrated into an already existing watch movement. For example, this module can be sold separately from the watch movement in which it can be integrated.

The invention also relates to a chronograph watch comprising the chronograph watch movement according to the invention.

Brief description of the figures

• La figure 1 illustre une vue en coupe d'un mode de réalisation du mécanisme selon l'invention.
• La figure 2 illustre une vue en perspective d'un mode de réalisation du pignon oscillant du mécanisme selon l'invention.
• La figure 3 illustre une vue frontale d'un mode de réalisation d'une montre chronographe selon l'invention.
• La figure 4 illustre une vue en perspective d'un mode de réalisation d'un mouvement selon l'invention.
• La figure 5 illustre une vue de dessus du mode de réalisation du mouvement de la figure 4.
• La figure 6 illustre la vue de dessus de la figure 5, sans la roue des secondes chronographe.
• La figure 7 illustre une vue en coupe d'un mode de réalisation d'un mouvement selon l'invention.
• La figure 8 illustre une autre vue en coupe d'un mode de réalisation d'un mouvement selon l'invention, le premier pignon oscillant étant en contact avec la roue de compteur d'un temps déterminé et le deuxième pignon oscillant étant en contact avec la roue des secondes chronographe.
• La figure 9 illustre une vue en coupe du mode de réalisation de la figure 8, le premier pignon oscillant n'étant pas en contact avec la roue de compteur d'un temps déterminé et le deuxième pignon oscillant n'étant pas en contact avec la roue des secondes chronographe.

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

• The figure 1 illustrates a sectional view of an embodiment of the mechanism according to the invention.
• The figure 2 illustrates a perspective view of an embodiment of the oscillating gear of the mechanism according to the invention.
• The figure 3 illustrates a front view of an embodiment of a chronograph watch according to the invention.
• The figure 4 illustrates a perspective view of an embodiment of a movement according to the invention.
• The figure 5 illustrates a view from above of the embodiment of the movement of the figure 4 .
• The figure 6 illustrates the top view of the figure 5 , without the second chronograph wheel.
• The figure 7 illustrates a sectional view of an embodiment of a movement according to the invention.
• The figure 8 illustrates another sectional view of an embodiment of a movement according to the invention, the first oscillating gear being in contact with the counter wheel of a predetermined time and the second oscillating gear being in contact with the second chronograph wheel.
• The figure 9 illustrates a sectional view of the embodiment of the figure 8 the first oscillating gear not being in contact with the counter wheel for a predetermined time and the second oscillating gear not being in contact with the second chronograph wheel.

Example (s) of embodiment (s) of the invention

• une roue de compteur d'un temps déterminé 2, cette roue de compteur d'un temps prédéterminé 2 étant différente de la roue des secondes chronographe, et
• un pignon oscillant 10, permettant l'embrayage entre une source d'énergie 1 et la roue de compteur d'un temps déterminé 2.

The figure 1 illustrates a sectional view of an embodiment of the mechanism according to the invention which comprises:

• a counter wheel of a determined time 2, this counter wheel having a predetermined time 2 being different from the wheel of the second chronograph, and
• an oscillating pinion 10, allowing the clutch between a power source 1 and the counter wheel of a determined time 2.

In the following, reference will be made to a chronograph minute wheel as a counter wheel of a predetermined time.

The oscillating pinion 10, visible in perspective on the figure 2 , comprises an axis of the oscillating gear 100 comprising two ends or pivots 1100 and 1200, which allow the cooperation of the oscillating gear 10 with a plate or a rocker 210. In particular, the oscillating pinion 10 pivots between a plate and a rocker 210 (see by example the figure 4 ). In the variant shown, these two ends 1100 and 1200 have a smaller section than that of the axis 100.

In correspondence of the first end 1100 (that of the bottom on the figure 1 , for example on the dial side), the oscillating pinion 10 comprises a first toothing 110. A power source 1 meshes with the lower toothing 110 of the oscillating pinion 10. In a preferred variant, the contact between the energy source 1 and the lower toothing 110 is continuous and permanent. The oscillating gear 10 is thus rotated about the main axis of its axis 100.

In a variant (not shown) the oscillating pinion 10 may comprise more than two teeth on its axis. In this variant it is thus possible to achieve a double clutch with a single oscillating gear.

In the context of the present invention, the expression "energy source" indicates a barrel or a linked intermediate mobile, for example directly connected to the barrel.

For example, as it is visible on the figure 4 , the energy source is an intermediate mobile 1 directly connected to the barrel 1 '. In another variant, the energy source which meshes with the lower toothing 110 of the oscillating gear 10 is the barrel 1 'itself.

A "power source" in this context therefore indicates a mobile that can provide another mobile much more energy than the second chronograph wheel could provide.

In correspondence of the second end 1200 (that of the top on the figure 1 , for example on the bridge side), the oscillating pinion 10 comprises a second toothing or wheel 120. This toothing 120 of the figure 1 is in contact with the chronograph minute wheel 2.

On the figure 2 the number of teeth of the first toothing 110 is different from that of the second toothing 120. However, it is also possible to provide an oscillating pinion in which the number of teeth of the first toothing 110 is equal to that of the second toothing. 120.

The oscillating pinion 10 also cooperates in correspondence of the second end 120 of the axis 100 with an actuating device of the oscillating pinion 210, for example a rocker, which is controlled by a control device, cam or column wheel not shown in this figure.

A control device 8 is for example visible on the Figures 4 to 6 .

Under the action of this control device 8, and through the rocker 210, the second end 1200 of the axis 100 of the oscillating pinion 10 moves, in particular oscillates or tilts so that the upper toothing 120 makes contact with the chronograph minute wheel 2. During the displacement of the second end 1200 of the axis 100 of the oscillating gear 10, the first end 1100 substantially maintains its position, thus ensuring the maintenance of contact between the source of energy 1 and the lower toothing 110 of the oscillating pinion 10, and thus the rotation of the oscillating pinion 10. In other words, under the action of the control device and thanks to the rocker 210, the oscillating pinion 10 pivots around the 1100 end, so that the upper toothing 120 comes into contact or meshes with the chronograph minute wheel 2.

When the upper toothing 120 comes into contact with the chronograph minute wheel 2, the rotational energy of the oscillating pinion 10 is transferred to the chronograph minute wheel 2, which therefore begins to rotate. In other words, as the oscillating pinion 10, and thus its upper toothing 120 is rotated, a rotational movement is transmitted to the chronograph minute wheel 2 following this contact. In this way, a swinging gear clutch between the chronograph minute wheel 2 and the energy source 1 is realized.

• premier état : elle permet un engrènement entre la deuxième denture 120 et la roue des minutes chronographe 2 ;
• deuxième état : elle ne permet pas d'engrènement entre la deuxième denture 120 et la roue des minutes chronographe 2.

The flip-flop 210 generally has two states:

• first state: it allows a meshing between the second toothing 120 and the chronograph minute wheel 2;
• second state: it does not allow meshing between the second set of teeth 120 and the chronograph minute wheel 2.

The illustrated oscillating pinion clutch device has the advantage of significantly reducing the starting jump (recoil or step advance) of the chronograph minute wheel 2 when the chronograph is engaged.

Since the oscillating pinion 10 enables a swing pinion clutch between the energy source 1 and the chronograph minute wheel 2, the energy to drive the chronograph minute wheel 2 is taken from a power source 1 which has more than one power source. energy compared to the second wheel chronograph 3, which is visible for example on the figure 4 . Consequently, the disturbances on this energy source 1 will have no impact on the chronograph minute wheel 2, or will have a much lower incidence than the known mechanisms.

The movement of the chronograph minute wheel 2 is thus completely detached from that of the second chronograph wheel 3. This is made possible by means of an arrangement according to the invention of the oscillating gear 10.

According to the invention, the chronograph minute wheel 2 is thus driven solely by the energy source via the oscillating gear 10, so that the rotation of the second chronograph wheel 3 is not disturbed by the rotation of the second wheel. chronograph minute wheel 2.

In other words, the mechanism according to the invention makes it possible to dissociate the function (therefore the movement) of the wheel of the second chronograph 3 from the function (therefore of the movement) of the chronograph minutes 2, with the aim of not disturbing the basic movement when the chronograph is engaged. This separation also makes it possible to simplify the development and operation of the chronograph minute wheel 2, because it is no longer driven by the chronograph seconds wheel 3. The simplification is also obtained by the presence of the oscillating pinion 10, which allows an improvement in the meshing with respect to a system traditional..

This separation and the presence of the oscillating pinion 10 also allow a space-saving arrangement while significantly reducing the starting jump to the chronograph minute wheel 2.

In the variant illustrated on the Figures 4 to 9 the counter wheel of a predetermined time is a chronograph minute wheel 2. In other words, in this preferred embodiment, the counter wheel of a predetermined time is a counter wheel N minutes, N being a positive integer ( N = 15, 30, 45, 60, etc.). It can be used to drive a chronograph minute indicator (for example, the visible MC indicator on the figure 3 ) which makes a complete turn of a dial C1 when the time measured reaches N minutes.

In another variant, this counter wheel of a predetermined time is a chronograph hour wheel. In other words, in this variant, the counter wheel of a predetermined time is a counter wheel M hours, M being a positive integer. It allows to drive a chronograph hour indicator (for example the HC indicator visible on the figure 3 ) that makes a complete turn of a dial C2 when the time has reached M hours.

The mechanism according to the invention offers a large number of possibilities for the counters N minutes and / or M hours, because N and M can be chosen according to the gear ratios between the energy source 1 or 1 'and the wheel counter of a predetermined time, the number of teeth of the energy source and / or the counter wheel of a given time, and / or according to their spacings.

• une roue des secondes mouvement 4,
• une roue des secondes chronographe 3,
• un deuxième pignon oscillant 20.

In the variants of Figures 4 to 9 the mechanism 1000 according to the invention also comprises:

• a wheel of the second movement 4,
• a second chronograph wheel 3,
• a second oscillating gear 20.

• une première denture arrangée pour engrener avec la roue des secondes mouvement 4 ;
• une deuxième denture arrangée pour se déplacer sous l'action d'un deuxième dispositif d'actionnement 220, de façon à engrener avec la roue des secondes chronographe 3, en réalisant ainsi un embrayage à pignon oscillant entre la roue des secondes mouvement 4 et la roue des secondes chronographe 3.

This second oscillating gear 20 comprises:

• a first set of teeth arranged to mesh with the wheel of the second movement 4;
• a second set of teeth arranged to move under the action of a second actuating device 220, so as to mesh with the wheel of the second chronograph 3, thereby producing an oscillating pinion clutch between the wheel of the second movement 4 and the seconds wheel chronograph 3.

In another variant, not illustrated, the same actuating device 210 which actuates the first oscillating gear can actuate the second oscillating gear 20 or vice versa.

In a preferred variant (not shown), the mechanism according to the invention comprises a second counter wheel of a predetermined time. For example, if the first counter wheel of a given time is a chronograph minute wheel, the second wheel may be a chronograph hour wheel.

In this preferred embodiment, the mechanism comprises a third oscillating pinion making an oscillating pinion clutch between the energy source (or another energy source) and the second meter wheel of a predetermined time.

For example the energy source is an intermediate mobile 1 directly in contact with a barrel 1 ', which can mesh on the one hand with the second toothing of the first oscillating gear 10 and on the other hand with the second toothing of the third gear oscillating, thus allowing to rotate for example a chronograph minute wheel 2 (cooperating with the first oscillating gear 10) and a chronograph hour wheel (cooperating with the third oscillating gear).

In another example, the energy source cooperating with the first oscillating gear is different from that cooperating with the third oscillating gear. For example, the source of energy cooperating with the first oscillating gear is a first intermediate gear 1 in contact with a first toothing of a double-toothed gear, and the energy source cooperating with the third oscillating gear is a second intermediate gear in contact with a second toothing of the double-toothed cylinder.

In a variant, this third oscillating gear is actuated by the first actuating device (for example a rocker that can actuate either the first oscillating gear only, or both the first and second oscillating gear).

In another variant, this third oscillating gear is actuated by the second actuating device which also actuates the second oscillating gear.

In yet another variant, this third oscillating gear is actuated by a third actuating device which does not actuate any other oscillating gear.

In all cases, the third oscillating gear comprises a first set of teeth arranged to mesh with a movement energy source and a second set of teeth arranged to move under the action of an actuating device (the first, the second or a third actuating device), so as to mesh with this other counter wheel by a predetermined time, thereby realizing an oscillating pinion clutch between the energy source and the second counter wheel of a predetermined time.

Those skilled in the art will also understand that it is possible to continue adding a fourth, fifth, sixth, etc. counter wheel of a determined time, each new wheel being associated with a new oscillating pinion, actuated by a new actuating device or by an actuating device which already actuates another oscillating pinion, and producing a swinging pinion clutch between this wheel and a new energy source of the movement (for example another intermediate mobile directly connected to the barrel which cooperates only with the new oscillating pinion) or by a source of energy of the movement already cooperating with another oscillating pinion.

In another variant, the chronograph hour wheel is not driven by means of an oscillating pinion by an energy source, but it is in direct contact with the energy source (for example the barrel) and kept permanently braked if it must not move to allow the display of a measured time.

In a preferred variant, the number of teeth of the second toothing of the first oscillating gear 10 is equal to the number of teeth of the second toothing of the second oscillating gear 20 and / or of the third oscillating gear (and / or of any other oscillating gear) which further simplifies the adjustment of the mechanism according to the invention.

As visible for example on the figure 4 , the second chronograph wheel 3 and the chronograph minute wheel 2 are associated with the core 33 respectively 22. Each core is associated with an indicator, for example a needle, that it can control and orient to display the corresponding indications. For example, the axis of a needle can be mounted directly on the axis of the corresponding core, a linked to this axis of the heart by means of a gear chain as short as possible, for example a wheel and a pinion .

Thus, the heart 22 is associated with the indicator chronograph minutes MC, visible on the figure 3 , where he is placed at three o'clock. The heart 33 is associated with the seconds indicator SC chronograph, visible on the figure 3 , where he is placed in the center. Another heart, not shown, is associated with the chronograph hour indicator HC, visible on the figure 3 where it is placed at nine o'clock. Of course, the position of the indicators on the 2000 watch of the figure 3 is non-limiting and any other position may be considered.

In a variant, the chronograph time indicators (SC, MC and / or HC) move continuously, that is to say without jumps or "dragging". In another variant, the mechanism could be arranged so that they move "step by step".

The figure 8 illustrates a sectional view of an embodiment of a movement according to the invention, in which a pusher (or another control device) "START" (not visible) of the chronograph watch has been engaged: indeed, not only the second oscillating gear 20 is in contact with the second chronograph wheel 3 (reference T ₂ on the figure 8 ), but also the first oscillating gear 10 is in contact with the chronograph minute wheel 2 (reference T ₁ on the figure 8 ). In this variant, the oscillating gears 10, 20 are substantially perpendicular to the faces of the wheels illustrated when they come into contact with the wheel of the second chronograph 3 respectively with the chronograph minute wheel 2.

The figure 9 illustrates the sectional view of the embodiment of the figure 8 , when the push button (or other control device) "STOP" (not visible) is selected. Indeed, the second oscillating gear 20 is no longer in contact with the wheel of the second chronograph 3 (reference E ₂ on the figure 9 , indicating the space between the second oscillating gear 20 and the second chronograph wheel 3), and also the first oscillating gear 10 is no longer in contact with the chronograph minute wheel 2 (reference E ₁ on the figure 9 indicating the space between the first oscillating gear 10 and the chronograph minute wheel 2). In this variant, the oscillating gears 10, 20 are inclined to the faces of the illustrated wheels.

According to an independent aspect of the invention, the counter wheel of a predetermined time, the second chronograph wheel, the actuating device and the oscillating gear of the mechanism according to the invention form a module or kit that can be integrated into an already existing watch movement. For example, this module can be sold separately from the watch movement in which it can be integrated. In a preferred embodiment, this module is integrated in the bridge side (that is to say the opposite side of the dial) of an existing watch movement.

Reference numbers used in the figures

1

Intermediate Mobile

1 '

barrel

2

Chronograph minute wheel

3

Second chronograph wheels

4

Wheels of seconds

6

Exhaust wheel

7

Regulating body

8

Column wheel

9

Cog train

10

First swinging gear

20

Second swinging gear

22

Heart

33

Heart

100

Axis of the first oscillating gear

110

First gear of the first oscillating gear

120

Second toothing of the first oscillating pinion

210

First actuating device

220

Second actuating device

1000

Movement

1100

First end of axis 100

1200

Second end of axis 100

2000

Chronograph watch

H

Hour indicator

M

Minutes indicator

SC

Second chronograph indicator

MC

Chronograph minute indicator

HC

Chronograph time indicator

C1

First dial

C2

Second dial

E ₁

Space

E ₂

Space

T ₁

Contact

T ₂

Contact

Claims (11)

Mechanism for chronograph watch movement comprising: a source of energy (1, 1 '), - a second chronograph wheel (3), a counter wheel of a predetermined time (2), said wheel being different from the wheel of the second chronograph (3), a device for actuating an oscillating gear (10), said oscillating gear (10) comprising: a first toothing (110) arranged to mesh with said energy source (1, 1 ') of the movement, a second toothing (120) arranged to move under the action of said actuating device (210, 220), so as to mesh with the counter wheel by a determined time (2), thus producing a clutch to oscillating pinion between the energy source (1, 1 ') and the counter wheel of a determined time (2), said counter wheel of a determined time (2) being thus driven only by the energy source (1, 1 ') via said oscillating pinion (10), so that the rotation of the second chronograph wheel (3) is separated from the rotation of the counter wheel by a predetermined time (2), the counter wheel of a predetermined time (2) being a chronograph minute wheel. Mechanism according to claim 1, said oscillating gear being a first oscillating gear, said actuating device being a first actuating device, said mechanism comprising: a wheel of the second movement (4), a second actuation device (220), a second oscillating gear (20) comprising: a first set of teeth arranged to mesh with the wheel of the second movement (4), a second set of teeth arranged to move under the action of the first actuating device (210) or of said second actuating device (220), so as to mesh with the seconds wheel chronograph (3), thereby producing a swinging gear clutch between the second movement wheel (4) and the second chronograph wheel (3). Mechanism according to one of claims 1 to 2, said counter wheel of a predetermined time being a first counter wheel of a given time and said energy source being a first energy source (1), said mechanism comprising: a third actuation device, a second counter wheel of a determined time, a third oscillating gear comprising: a first set of teeth arranged to mesh with said first energy source of the movement (1) or with a second energy source of the movement (1 '), a second set of teeth arranged to move under the action of said first actuating device or of said third actuating device, so as to mesh with said second counter wheel for a predetermined time, thus producing an oscillating pinion clutch; between the first or the second energy source and the second counter wheel of a predetermined time. Mechanism according to claim 3, the first counter wheel of a given time being a chronograph minute wheel (2) and the second counting wheel of a predetermined time being a chronograph hour wheel. Mechanism according to one of claims 1 to 4, the number of teeth of the second toothing of the first oscillating gear (10) being equal to the number of teeth of the second toothing of the second oscillating gear (20) and / or to the number of teeth of the second toothing of the third oscillating gear. Mechanism according to one of claims 1 to 5, the first actuating device (210) and / or the second actuating device (220) being a rocker. Mechanism according to one of claims 1 to 6, comprising a control device (8) actuating the first and / or the second actuating device, said control device (8) being for example a cam control device and / or column wheel. Mechanism according to one of claims 1 to 7, said energy source being a cylinder (1 ') or an intermediate mobile (1) which meshes with said barrel (1'). Mechanism according to one of claims 1 to 8, said oscillating pinion (10) comprising more than two teeth. Chronograph watch movement comprising the mechanism according to one of claims 1 to 9. Chronograph watch comprising the movement according to claim 10.

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