CH712362B1 - Timepiece comprising a push-button winding mechanism. - Google Patents

Abstract

The present invention relates to a timepiece, comprising a mechanism (1) for winding by pushing a barrel winding mobile (5), the winding mechanism comprising a pushbutton (P), a control member (2 ) movable under the action of the pusher and a transmission assembly arranged to mesh with the winding mobile (5) under the action of the control member (2). According to the invention, the control member (2) is movable between a rest position and a winding position. In addition, the transmission assembly comprises at least one toothed sector (3), the center of which is movable along a determined path during movements of the control member (2) from the rest position to the winding position and vice versa. -versa so as to engage with the winding mobile (5) only when moving the control member (2) from the rest position to the winding position and to disengage from the winding mobile when moving the control member from the winding position to the rest position.

Description

Technical area

The present invention relates to the field of watchmaking. It relates more particularly to a timepiece comprising a push-button winding mechanism.

State of the art

When the movement of a mechanical watch stops naturally, it is necessary to wind the barrel of the watch so that the oscillator restarts and the movement operates normally. If the movement is equipped with an automatic winding mechanism, it is nevertheless necessary to start winding the barrel by a mechanical winding mechanism that the automatic winding mechanism then relays to completely wind the barrel and maintain the operation of the movement, from the less while the watch is worn by a user.

It is known to produce winding mechanisms for watch movements actuated either by rotation of a winding rod or by translation of a pusher, the latter actuating in translation a winding rod. Push-button winding mechanisms, although less common than those with winding stem rotation, have also been widely described in the prior art.

These pusher winding mechanisms allow a user to print by pressure on the pusher a translational movement of the latter through an orifice receiving said pusher in the watch case, this movement being converted into a rotational movement of a drive member meshing with a barrel winding wheel, for example a ratchet or a toothing of the barrel itself.

[0005] Swiss patents CH 5578, CH 140 164 or CH 707 985 describe winding mechanisms by push-button cooperating in translation with a winding rod which actuates at least one lever member, such as a toothed sector or a rake for example , bearing or comprising a toothing for engaging the barrel winding mobile. The tooth profile then determines the torque transmitted to the winding mobile.

However, it turns out with such mechanisms difficult to allow the disengagement of the toothed sector or of the rake at the end of the travel of the winding stem in order to allow the latter and the pusher to return to its starting position. or rest without driving the winding mobile in the opposite direction or simply without rubbing against the latter with the wear and the risks of blocking that this entails.

[0007] The mechanisms described in CH 5578 and CH 140 164 do not make it possible to release the winding mobile at the end of the travel of the winding rod without contact of the lever member on the teeth of the latter and are therefore not completely satisfactory and reliable.

[0008] The winding mechanism described in CH 707 985 itself comprises a lever member provided with teeth which can be retracted by pivoting about a fixed axis. Such a construction proves to be satisfactory for allowing the lever member to disengage from the winding wheel set, but on the other hand requires a modular construction of the lever member, which is both complex and functionally random, in particular in terms of the reactivity of the lever member. retraction of the retractable teeth of the lever member.

The present invention aims to provide a timepiece provided with a push-winding mechanism of an alternative structure which allows complete, rapid and reliable decoupling of the lever member for driving the mobile d winding of the movement of the timepiece when the pusher returns to its rest position.

Disclosure of the invention

More specifically, the invention relates to a timepiece comprising a winding mechanism by push button comprising a push button, a movable control member under the action of the push button and a transmission assembly arranged to mesh with a mobile barrel winding under the action of the control member, characterized in that the control member is movable between a rest position and a winding position and in that the transmission assembly comprises at least one toothed sector, the center of which is movable along a path determined during the movements of the control member from the rest position to the winding position and vice versa so as to mesh with the winding wheel only when moving the 'control member from the rest position to the winding position and to disengage from the winding wheel during movements of the control member from the winding position to the rest position.

[0011] This arrangement advantageously makes it possible to produce a winding mechanism by pushing a timepiece whose toothed sector disengages directly and completely from the winding mobile by displacement of its center along a determined path to remove the said toothed sector of the winding mobile. In addition, the constituent elements of the mechanism are limited in number, of a simple geometry and the moving parts of the mechanism operate only short strokes in the timepiece, thus providing a simple and very compact winding mechanism, in particular in the case of the timepiece. thickness of the timepiece, especially in comparison with the mechanism described in CH 707 985.

[0012] The winding mechanism of the timepiece of the invention can advantageously be used either as the main winding mechanism of the motor member of the timepiece, or simply as a starting mechanism winding, in which case an ancillary winding mechanism is also integrated into the timepiece. Only the number of pushes on the winding push-button then differs according to the particular use chosen.

[0013] Advantageously, the pusher is integral with the control member and adapted to extend at least partially projecting through an orifice made in the timepiece, in particular in a case thereof.

[0014] According to one embodiment of the invention, the control member is mounted to be movable in rotation about an axis, in particular on a plate or a bridge of the timepiece.

[0015] According to this embodiment, the control mechanism of the timepiece advantageously comprises a return spring for the control member from the winding position to the rest position.

In this embodiment, the control member advantageously comprises a first rocker mounted pivotably about a first fixed pivot and the transmission assembly comprises a second rocker mounted pivotably at a first end around a second pivot fixed and integral at a second end of a mobile mounted to pivot at a first end around a first mobile pivot, the mobile comprising said toothed sector at a second end opposite to the first mobile pivot as well as a rake meshing with an integral rack of the first rocker so as to cause the mobile to pivot around the first mobile pivot.

[0017] Advantageously, the center of the toothed sector coincides with the first movable pivot.

[0018] In this embodiment, the rake is preferably mounted to pivot on the first movable pivot.

[0019] Advantageously, the rake further comprises a rod for driving the toothed sector in rotation, said rod extending between the first movable pivot and a second movable pivot bearing on or being integral with a return finger mobile.

In this embodiment, the second rocker is preferably constrained to rotate around the second fixed pivot by a spring bearing on a stud capable of being arranged on the plate or on a bridge of the timepiece.

Preferably then the spring is a leaf spring formed of material on the body of the second lever.

In this embodiment, the first latch further advantageously comprises at one end, preferably opposite the first fixed pivot, a finger configured to, in the rest position, bear the second latch so as to tension its spring and keep the toothed sector disengaged from the winding wheel set, and when moving the control member to the winding position release the second rocker in rotation under the return force of its spring to allow the toothed sector to engage with the armage mobile.

In another embodiment of the invention, the control member comprises a rocker mounted in rotation about a fixed pivot capable of being arranged on the plate or on a bridge of the timepiece and the 'transmission assembly comprises a return wheel forming or carrying said toothed sector as well as an intermediate mobile comprising a peripheral toothing for meshing with the return wheel, the intermediate wheel being integral in rotation with the lever by means of a control return pivotally mounted around the fixed rocker pivot.

In this second embodiment, the return wheel is advantageously mounted freely around a shape of axis configured to, on the one hand, guide the return wheel in rotation in meshing of the winding mobile under the driving action of the intermediate mobile during one movement of the control member from the rest position to the winding position and, on the other hand, to guide the return wheel following a non-circular path of such that the latter releases from the winding mobile under the driving action of the intermediate mobile during a movement of the control member from the winding position to the rest position.

[0025] Advantageously, the winding mechanism of the timepiece of the invention further comprises a leaf spring secured to the plate or to a bridge of the timepiece and arranged to permanently constrain the wheel of return bearing against the shape of the axis.

Again advantageously, the axis shape is fixed on the plate of the timepiece and comprises at least two consecutive peripheral sections comprising a first circular peripheral section and a second non-circular peripheral section.

According to this particular embodiment, the latch is returned to the rest position by a spring, preferably comprising a blade interposed between the latch and a stud secured to the control return.

Brief description of the drawings

[0028] Other details of the invention will emerge more clearly on reading the following description, made with reference to the appended figures in which: <tb> - <SEP> FIG. 1 represents an overall exploded perspective view of a winding mechanism for a timepiece according to the invention according to a first embodiment; <tb> - <SEP> FIG. 2 represents an overall view of the winding mechanism of FIG. 1 in a rest position; <tb> - <SEP> FIGS. 3 to 7 respectively represent views similar to that of FIG. 1 showing the various successive positions adopted by the mechanism of FIG. 1 during its operating kinematics; <tb> - <SEP> FIG. 8 represents an overall exploded perspective view of a winding mechanism for a timepiece according to the invention according to a second embodiment; <tb> - <SEP> FIG. 9 represents an overall view of the winding mechanism of FIG. 8 in a rest position; <tb> - <SEP> Figures 10 and 11 respectively show views similar to that of Figure 8 showing the different successive positions adopted by the mechanism of Figure 8 during the winding kinematics.

Embodiment of the invention

There is shown in Figures 1 to 7 a first embodiment of a winding mechanism of a timepiece according to the invention and in Figures 8 to 11 a second embodiment of a mechanism winding of a timepiece according to the invention.

In these Figures 1 to 11, only the components of the winding mechanism are shown for the sake of clarity of representation. It is understood of course that in the context of the invention this winding mechanism is a particular assembly of a timepiece such as a wristwatch comprising, integrated in a box not shown in the figures and in a kinematic connection with at least one mobile for winding the barrel of the timepiece, this mobile for winding the winding can be of any conventional type known to those skilled in the art in the field of watchmaking, in particular any mobile equipped with 'at least one toothed sector for rotating said mobile.

According to the first embodiment shown in Figures 1 to 7, the timepiece of the invention comprises a winding mechanism 1 by pushing a mobile winding 5 of barrel such as a ratchet or a toothed barrel crown, the winding mechanism 1 comprising a toothed sector mounted to rotate freely on an axis integral with a plate or a bridge of the timepiece, the plate or the bridge being not shown in the figures .

The winding mechanism 1 comprises a pusher P, integral with a control member 2 movable in rotation about an axis X1 integral with the plate or a bridge of the timepiece under the action of the pusher P between a rest position and a winding position.

The control member 2 is in kinematic connection with a transmission assembly arranged to mesh with the winding mobile 5 during the rotational movement of the control member 2 so as to drive said winding mobile R in rotation around a specific axis for, in a conventional way, store mechanical energy.

According to the invention, the center of the toothed sector of the winding mechanism 1 is movable along a path determined during the movements of the control member 2 from the rest position to the winding position and vice versa from so as to engage with the winding wheel 5 only when moving the control member 2 from the rest position to the winding position and to disengage from the winding wheel 5 when moving the control member 2 from the reassembly position to the rest position.

More particularly, in this first embodiment, the control member 2 consists of a first lever 21 pivotally mounted about a first fixed pivot P1 materializing the axis X1, said fixed pivot being for example formed a pin driven out on a frame of the timepiece, in particular the plate or a bridge of the timepiece.

The pusher P formed of material with the latch 21 and is preferably adapted to extend, conventionally, at least partially projecting through an orifice formed in the timepiece, in particular in a box of it.

The transmission assembly comprises a second rocker 4 pivotally mounted at a first end around a second fixed pivot P2, also for example formed by a pin driven out on the frame of the timepiece. The second rocker 4 is also integral with a second end of the winding mobile 5 mounted to pivot at a first end about a first mobile pivot Pm1 with which the center of the toothed sector 3 coincides. The second rocker 4 is further constrained to rotate around the second fixed pivot P2 by a spring 41 bearing on a stud 8 integral with the plate or a bridge of the timepiece. Preferably, the spring 41 can take the form of a leaf spring formed from material on the body of the second lever 4.

As shown in Figures 1 to 7, the toothed sector 3 movable in rotation around the pivot Pm1 can travel a complex path made of two rotations, a first rotation on itself around its movable pivot Pm1 and a second path circular, or at least along a circular section, centered on the second fixed pivot P2 of the second lever 4.

The toothed sector 3 is formed at a second end of the winding mobile 5 opposite the first mobile pivot Pm1 on which is also mounted a rake 6 free to rotate around the pivot Pm1 and able to mesh with a rack 7 integral with the first rocker 2. In the example of FIGS. 1 to 7, the rack 7 is formed of material protruding from the body of the first rocker 21.

The rake 6 further comprises a connecting rod (or rod) 61 for driving the toothed sector 3 in rotation, which extends from the first movable pivot Pm1 and a second movable pivot Pm2 formed for example by an axis 62 driven into an orifice provided for this purpose in the connecting rod 61 or else a lug formed projecting on the lower surface of the connecting rod 61. The connecting rod 61 and its second movable pivot Pm2 are arranged so as to cooperate by pressing the axis 62 resting in a hook 54 formed at the end of a return finger 53 of the winding wheel 5 so as to drive the toothed sector 3 in rotation about its mobile axis Pm1 as will be described below.

Finally, the first lever 2 comprises at its end opposite the first fixed pivot P1 around which it is movable in rotation a finger 22 arranged to, in the rest position at least, bear on a pin or lug 42 projecting on the second rocker so as to tension its spring 41 and thus keep the toothed sector 3 disengaged from the ratchet R. To do this, the return spring K of the rocker 2 is chosen so that the return constant of the latter is such that the force applied by the finger 22 on the pin 42, taking into account the lever arm formed by the latch 1 itself, is greater at least than the return constant of the spring 41 of the second latch and resistance applied by the pin 42 on finger 22 under the effect of spring 41.

The kinematics of the winding mechanism 1 according to the first embodiment of the invention will be described in more detail below with reference to Figures 2 to 7.

Figure 2 shows the winding mechanism 1 in its neutral rest position, before and after actuation of the control member 2 by action of the pusher P. From this rest position, the winding mechanism 1 is actuated ( Figures 3 to 6) by a pressure (arrow F) of a user on the pusher P, which generates a pushing force on the first lever 21 forming the control member of the mechanism, greater than the return constant of the spring K of this latch 21. Said latch 21 then pivots around its fixed pivot P1 in the counterclockwise direction, thus releasing the finger 22 from the pin 42 of the second latch 4, which also then pivots on its fixed pivot P2 under the force of return of its spring 41, thus initiating a circular movement of the mobile pivot Pm1 and therefore of the winding mobile 5 which moves in order to reach the pitch diameter of the ratchet R to allow the toothed sector 3 to engage with the ratchet R (figure 3). When the teeth of the toothed sector 3 are engaged with those of the ratchet R, it is impossible to have tooth-to-tooth locking due to the flexible structure with double rockers 21, 4 of the winding mechanism of the invention which allows repositioning in all circumstances of contact between the winding mobile 5 and the ratchet R.

The thrust of the pusher P on the latch 2 also simultaneously induces a rotational drive of the rake 6 by the teeth 7 of the first latch 21 around the movable pivot Pm1. This rotation of the rake 6 transmits a rotational movement of the winding mobile 5 in the clockwise direction around the mobile pivot Pm1 by means of the rod 61 resting in the hook of the return finger 53 of said winding mobile. This rotation of the winding mobile 5 thus drives the toothed sector 3 in a suitable manner and by meshing effect the ratchet R in the counterclockwise direction to raise the barrel spring (Figure 4).

When the user's pressure on the pusher P is released (Figure 5) the winding mobile 5 and its toothed sector 3 disengages from the ratchet R to return to the rest position. The complete return to the rest position (FIG. 6) takes place under the simple return force of the spring K of the first lever 21, which thus fully fulfills its function as a control member of the mechanism. The application of multiple pressures on the push-button P by the user thus makes it possible to wind the barrel, or in the case of a self-winding timepiece, to initiate the winding to restart the movement after a complete stop. of the last.

Advantageously, the winding mechanism 1 also comprises a safety position shown in Figure 7, especially when the force to be overcome to drive the ratchet R is too great, especially in the event of complete reassembly of the barrel of the part d watchmaking. In such a situation, the winding mobile 5 disengages in order to avoid any breakage. This disengagement is effected by releasing the axis 62 of the rod 61 of the rake 6 from the hook of the return finger 53 of the winding mobile 5, as shown in FIG. 3. This disengagement of the rod 61 thus prevents too great a rotational force is imposed on the ratchet R, which would risk damaging the mechanism of the timepiece. When the pressure on pusher P is released, the first lever 1 returns to the rest position under the effect of its return spring K, as do the second lever 4 and the winding wheel 5.

A second embodiment of the winding mechanism of a timepiece according to the invention is shown in Figures 8 to 11 is described in detail below.

In this second embodiment, the winding mechanism 100 comprises a control member 200 formed of a lever 201 rotatably mounted around a fixed pivot P1 'on the plate or on a bridge of the part of watchmaking. This rocker 201 has at one end forming a control pusher P, substantially opposite its pivot P1 '.

The transmission assembly of the winding mechanism 100 itself comprises a ratchet return wheel 500 forming or carrying said toothed sector 300 as well as an intermediate mobile 600 comprising a peripheral toothed sector 601 for meshing with the wheel 500 of ratchet return in order to drive the ratchet R in rotation to wind up the barrel spring of the movement of the timepiece.

The intermediate mobile 600 is arranged to cooperate in rotation with the lever 201 by means of a control reference 700 pivotally mounted about a second fixed pivot P2 'formed for example by a pin driven on the plate and / or a bridge of the timepiece. The control return is arranged to cooperate in rotation, and more particularly to be driven in rotation around its fixed pivot P2 ', by the latch 201 via a stud 701 projecting on a surface of said control return 700 and forming a stop against which the lever 201 is able to bear when the latter is moved in rotation around its pivot P1 'by pressure on the control pusher P. In addition, a leaf spring 401 formed on a weighing bridge 400 suitable to be screwed onto the plate of the timepiece also bears at its free end on the stud 701 so that said spring 401 exerts a return stress on said stud 701 opposite to the direction of thrust of the lever 201 during the rotation of the latter following a pressure of pusher P.

The kinematic connection in rotation of the control return 700 to the intermediate mobile 600 is produced by a pinion 602 or a lug formed on the intermediate mobile 600, or arranged on the latter, on which is coupled the control return 700 in an opening 702 of complementary shape to that of the coupling member 602. In a particular way as shown in FIG. 8, the pinion 602 is mounted to rotate freely on an axis 603, one end of which is integral with the intermediate mobile 600 and the other end is fitted into an orifice 402 formed for this purpose in the weighing bridge 400. The pinion 602 further comprises a tooth 604 able to engage in abutment a lug 605 projecting from the surface of the intermediate mobile 600 in order to transmit a drive torque in rotation of said intermediate mobile around the axis defined by the pivot P2 ′ of rotation of the control transmission 700.

Furthermore, the ratchet return wheel 500 is freely mounted around a form of axis 800 capable of being screwed or riveted, for example, on the plate of the timepiece.

This form of axis 800 is advantageously configured to, on the one hand, guide the ratchet return wheel 500 in rotation meshing with the ratchet R under the driving action of the intermediate mobile 600 during a displacement of the rocker 201 following a push on the pusher P and, on the other hand, to guide the ratchet return wheel 500 along a non-circular path, for example a cycloid or epicycloid path, such that the latter disengages from the intermediate mobile 600, and more particularly of its toothed sector 601, to allow the return of the lever 201 to a rest position under the return of the spring 401 of the weighbridge 400.

To do this, the axis shape 800 is fixed on the plate of the timepiece and comprises at least two consecutive peripheral sections 801, 802 comprising a first circular peripheral section 801 for guiding the return wheel 500 ratchet to engage and guide in rotation the ratchet R and a second non-circular peripheral section 802 for guiding the same ratchet return wheel 500 to allow this wheel 500 to be uncoupled from the intermediate mobile 600 as indicated above.

In order to permanently force the ratchet return wheel 500 to bear against the shape of the axle 800 and coupled to the ratchet R, a leaf spring 900 is fixedly attached to the plate of the timepiece. This leaf spring thus forces the wheel 500 to slide on the circular section 801 of the axis form 800 during the movements of the lever 201 from the rest position to the winding position and to roll on the non-circular section 802 when the return of the latch to the rest position, said latch 201 being returned to the rest position by the spring 401.

The kinematics of the winding mechanism 1 according to the second embodiment of the invention will be described in more detail below with reference to Figures 9 to 11.

FIG. 9 shows the winding mechanism in its rest position. In the latter, the ratchet return wheel 500 rests on the circular section 801 of the axis form 800 and its teeth mesh with that of the ratchet R. At the same time, the peripheral teeth 601 of the intermediate mobile 600 mesh also that of the ratchet return wheel 500.

When a user presses the pusher P of the latch 201 to initiate a winding action (Figure 10) said latch 201 pivots around its fixed pivot P1 'and pushes on the pad 701 of the return of control 700, thus deforming the leaf spring 401 and causing the intermediate mobile 600 in rotation around its pivot P2 'via the pinion 602. The rotation of the intermediate mobile 600 induces by its teeth 601 a drive in rotation in the counterclockwise direction of the wheel 500 of ratchet return around the form of axis 800 by sliding on the circular section 801 thereof and consecutively a clockwise rotation of the ratchet R. At the end of the rotation travel of the rocker 201, the intermediate mobile arrives at the end of the winding stroke and its teeth 601 disengage from this of the ratchet return wheel 500 as shown in FIG. 10.

From the end of reassembly position of Figure 10, the return of the lever 201 and of the intermediate mobile 600 is done under the return force of the spring 401 on the stud 701 of the control return 700, which drives the intermediate mobile rotating counterclockwise around the pivot P2 '. This rotation involves the engagement of the teeth 601 with that of the ratchet return wheel 500. The return force of the spring 401 being greater than that of the spring 900, the wheel 500 is then pressed on its internal crown against the non-circular section 802 of the shape of the axis 800, which tends to move the toothing away from the wheel 500 from that 601 of the intermediate mobile and therefore to disengage the teeth of the toothing 601 from those of the wheel 500, thus allowing the return to the rest position of the lever 201 and of the intermediate mobile 600 without forcing on the ratchet R in the opposite direction to that of winding the barrel spring.

Once back to the rest position, the user can again press the pusher P and so on to sufficiently wind the barrel spring of the movement of the timepiece and allow it to be restarted. this.

Claims (17)

1. Timepiece comprising a mechanism (1, 100) for winding by pushing a mobile winding (5, 500) of the barrel, the winding mechanism comprising a push button (P), a control member (2 , 200) movable under the action of the pusher and a transmission assembly arranged to mesh with the winding mobile (5, 500) under the action of the control member (2), characterized in that the member control (2) is movable between a rest position and a winding position and in that the transmission assembly comprises at least one toothed sector (3, 300) whose center is movable along a path determined during the movements of the control member (2, 200) from the rest position to the winding position and vice versa so as to mesh with the winding wheel (5, 500) only when moving the control member ( 2, 200) from the rest position to the winding position and to disengage from the winding wheel during movements of the control from the winding position to the rest position. 2. Timepiece according to claim 1, characterized in that the pusher (P) is integral with the control member (2, 200) and adapted to extend at least partially projecting through an orifice. provided in the timepiece, in particular in a box thereof. 3. Timepiece according to claim 1 or 2, characterized in that the control member (2, 200) is arranged to be mounted to be movable in rotation about an axis (X1, P1 '), in particular on a plate or a bridge of the timepiece. 4. Timepiece according to one of claims 1 to 3, characterized in that it comprises a spring (K, 401) for returning the control member (2, 200) from the winding position towards the rest position. 5. Timepiece according to one of claims 3 to 4, characterized in that the control member (2) comprises a first lever (21) pivotally mounted about a first fixed pivot (P1) materializing said axis (X1) and the transmission assembly comprises a second rocker (4) pivotally mounted at a first end around a second fixed pivot (P2) and integral at a second end of a winding mobile (5) pivotally mounted at a first end around a first mobile pivot (Pm1), the winding mobile (5) comprising said toothed sector (3) at a second end opposite to the first mobile pivot (Pm1) as well as a rake (6) meshing with a rack (7) integral with the first rocker (21) so as to cause the winding mobile (5) to pivot around the first mobile pivot (Pm1). 6. Timepiece according to claim 5, characterized in that the center of the toothed sector (3) coincides with the first movable pivot (Pm1). 7. Timepiece according to one of claims 5 or 6, characterized in that the rake (6) is pivotally mounted on the first movable pivot (Pm1). 8. Timepiece according to one of claims 5 to 7, characterized in that the rake (6) further comprises a connecting rod (61) for driving the toothed sector (3) in rotation, said connecting rod extending. between the first movable pivot (Pm1) and a second movable pivot (Pm2) bearing on or being integral with a return finger (53) of the winding mobile. 9. Timepiece according to one of claims 5 to 8, characterized in that the second rocker (4) is constrained to rotate around the second fixed pivot (P2) by a spring (41) bearing on a stud ( 8) arranged on the plate or a bridge of the timepiece. 10. Timepiece according to claim 9, characterized in that the spring (41) is a leaf spring formed from material on the body of the second lever (4). 11. Timepiece according to one of claims 9 or 10, characterized in that the first lever (21) comprises at one end, preferably opposite the first fixed pivot (P1), a finger (22) configured for, in the rest position, lean on the second lever (4) so as to tension its spring (41) and keep the toothed sector (3) disengaged from the ratchet (R), and when moving the control member ( 2) towards the reassembly position release the second rocker (4) in rotation under the return force of its spring (41) to allow the toothed sector (3) to engage with the ratchet (R). 12. Timepiece according to one of claims 1 to 4, characterized in that the control member (200) comprises a rocker (201) rotatably mounted about a fixed pivot (P1 ') arranged on the plate or on a bridge of the timepiece and the transmission assembly comprises a ratchet return wheel (500) forming or carrying said toothed sector (300) as well as an intermediate mobile (600) comprising a peripheral toothing ( 601) meshing with the ratchet return wheel (500), the intermediate mobile (600) being integral in rotation with the lever via a control return (700) mounted to pivot around the fixed pivot (P1 ') of the flip-flop (201). 13. Timepiece according to claim 12, characterized in that the ratchet return (500) is freely mounted around a form of axis (800) configured to, on the one hand, guide the ratchet return. rotation (500) meshing the ratchet (R) under the driving action of the intermediate mobile (600) during a displacement of the control member (2) from the rest position to the winding position and, on the other hand, to guide the ratchet return wheel (500) following a non-circular path such that the latter disengages from the ratchet under the driving action of the intermediate mobile (600) during a displacement of the ratchet. 'control member (200) from the winding position to the rest position. 14. Timepiece according to claim 13, characterized in that it further comprises a leaf spring (900) arranged on the plate or a bridge of the timepiece and arranged to permanently constrain the return wheel of ratchet (500) resting against the form of axis (800). 15. Timepiece according to claim 13 or 14, characterized in that the axis shape (800) is fixed on the plate of the timepiece and comprises at least two consecutive peripheral sections comprising a first circular peripheral section. (801) and a second non-circular peripheral section (802). 16. Timepiece according to one of claims 13 to 15, characterized in that the latch (201) is biased towards the rest position by a spring (401). 17. Timepiece according to claim 16, characterized in that the spring (401) comprises a blade interposed between the lever (201) and a stud (701) integral with the control return (700).