EP3627232A1 - Self-winding watch movement with time display hands located on the rotor side - Google Patents

Abstract

Self-winding watch movement (1) comprising: - a plate (2), - a barrel (5), - a carriageway (14) comprising a minute cannon (15) which carries a minute hand (16), - a hour mobile (20) comprising an hour cannon (21) which carries an hour hand (22), - an oscillating weight, arranged on the same side of the plate as the carriageway and the hour mobile, which comprises: ∘ a central hub (26), ∘ a rim (27), lourd a heavy sector (28), - a booster shaft (29) integral with the central hub and around which the minute cannon and the hour cannon are mounted coaxially, the minute hand and the hour hand being located between the plate and the rim of the rotor.

Description

TECHNICAL AREA

The invention relates to the field of watchmaking. It relates, more specifically, to a self-winding watch movement, intended to equip a wristwatch.

PRIOR ART

The first documented self-winding watch mechanisms date from the end of the 18th century. These mechanisms have undergone numerous improvements. A typical mechanism, today widely used, comprises an oscillating mass in the form of a rotor, the rotation of which is transmitted to the barrel via a reduction gear train.

Conventionally, a rotor comprises a hub, by which it is fixed (with the possibility of rotation) on the stage of the movement, a rim (or "support") integral with the hub, as well as a heavy annular sector (or "heavy") integral with the rim and which, by the imbalance which it induces in the distribution of the masses of the rotor, causes the latter to rotate during the movements of the watch.

In many watches, the hands are located on the side of a front face of the plate and the rotor is on the contrary located on the side of a rear face of the plate, that is to say on the side opposite the hands.

However, there are embodiments in which the rotor is located on the same side as the needles, cf. eg. the swiss patent CH 703 964 . These achievements, which are interesting for the distraction that provides the wearer the spectacle of the rotor pivoting, however, is not without drawbacks.

The watch movement proposed in the patent CH 703 964 provides for the passage of the hour and minute barrels in a central opening formed in the hub of the rotor, which is disposed between the body of the watch movement (including the plate, the bridges and the mobiles pivotally mounted between the plate and the bridges) and hour and minute hands.

As a result, the hour and minute hands are located at a fairly large distance from the body of the movement, and in particular from a possible scale for reading the hours.

This provision is problematic because, on the one hand, it interferes with an accurate reading of the time. On the other hand, its aesthetics is questionable due to the large space separating the hands and the body of the movement (taking into account the fact that this space is at least partly filled by the rotor).

An objective of the invention is therefore, in a watch movement with automatic winding and a rotor situated on the side of the time display, to solve the problems mentioned.

SUMMARY OF THE INVENTION

• Une platine ;
• Un barillet monté en rotation par rapport à la platine et pourvu d'une roue dentée primaire ;
• Une chaussée montée en rotation par rapport à la platine autour d'un axe central et en relation d'engrenage avec la roue dentée primaire du barillet par l'intermédiaire d'un rouage de minuterie, cette chaussée comprenant un canon des minutes qui porte une aiguille des minutes ;
• Un mobile des heures monté en rotation par rapport à la platine autour de l'axe central et en relation d'engrenage avec la chaussée, ce mobile des heures comprenant un canon des heures qui porte une aiguille des heures ;
• Une masse oscillante sous forme d'un rotor monté en rotation par rapport à la platine autour de l'axe central, du même côté de la platine que la chaussée et le mobile des heures, ce rotor comprenant :
  • ∘ Un moyeu central en relation d'engrenage avec le barillet ;
  • ∘ Une jante solidaire du moyeu central ;
  • ∘ Un secteur annulaire lourd qui est solidaire de la jante ;
  • ∘ Un arbre rehausseur solidaire du moyeu central et par lequel ce dernier est monté en rotation par rapport à la platine, le canon des minutes et le canon des heures étant montés de manière coaxiale autour de l'arbre rehausseur, l'aiguille des minutes et l'aiguille des heures étant situées entre la platine et la jante du rotor.

To achieve the above objective, an automatic winding watch movement is proposed, which includes:

• A turntable;
• A barrel mounted in rotation relative to the plate and provided with a primary toothed wheel;
• A roadway rotatably mounted relative to the plate about a central axis and in gear relationship with the primary gear of the barrel by means of a clockwork, this carriageway comprising a minute cannon which carries a minute hand;
• An hour mobile rotatably mounted relative to the plate about the central axis and in gear relationship with the road, this hour mobile comprising an hour cannon which carries an hour hand;
• An oscillating weight in the form of a rotor mounted in rotation relative to the plate around the central axis, on the same side of the plate as the carriageway and the hours mobile, this rotor comprising:
  • Central A central hub in gear relationship with the barrel;
  • ∘ A rim secured to the central hub;
  • Lourd A heavy annular sector which is integral with the rim;
  • ∘ A booster shaft integral with the central hub and by which the latter is rotatably mounted relative to the plate, the minute cannon and the hour cannon being mounted coaxially around the booster shaft, the minute hand and the hour hand being located between the plate and the rim of the rotor.

According to a preferred embodiment, the movement comprises a bearing provided with a ring fixed relative to the plate, a ring movable in rotation relative to the ring fixed around the central axis, and interposed rolling elements between the rings, the booster shaft being integral with the movable ring.

The movable ring preferably carries a toothed crown in gear relation with the barrel by means of a reduction gear train.

According to one embodiment, the fixed ring is an inner ring (preferably secured to the bridge by a central screw) of the bearing and the movable ring is an outer ring.

The watch movement advantageously comprises a socket fixed relative to the plate and on which the hour barrel and the canon of minutes. The hour barrel is fitted on the sleeve and the minute barrel is fitted on the hour barrel.

The carriageway and the hours mobile are advantageously mounted on an upper bridge fixed on the plate, this upper bridge having an internal face on the side of the plate, and an opposite external face. The barrel is preferably mounted on the side of the internal face of the upper bridge, while the carriageway, the hours mobile and the rotor are mounted on the side of the external face of the upper bridge.

• Un rouage de minuterie, en prise d'engrenage avec un pignon des minutes solidaire du canon des minutes, ce rouage de minuterie étant monté en rotation par rapport au pont supérieur du côté de la face externe de celui-ci ;
• Un mobile inverseur, qui comprend :
  • ∘ Une roue supérieure située du côté de la face externe du pont supérieur et en prise d'engrenage avec le rouage de minuterie,
  • ∘ Une roue inférieure située du côté de la face interne du pont supérieur, solidaire en rotation de la roue supérieure et en relation d'engrenage avec la roue dentée primaire du barillet ;
  • ∘ Un axe reliant, au travers du pont supérieur, la roue supérieure et la roue inférieure.

The watch movement preferably includes:

• A timer train, in gear engagement with a minute pinion integral with the minute barrel, this timer train being mounted in rotation relative to the upper bridge on the side of the outer face thereof;
• A reversing mobile, which includes:
  • ∘ An upper wheel located on the side of the external face of the upper bridge and in gear engagement with the timer train,
  • Inférieure A lower wheel located on the side of the internal face of the upper bridge, integral in rotation with the upper wheel and in gear relationship with the primary gear of the barrel;
  • ∘ An axis connecting, through the upper deck, the upper wheel and the lower wheel.

BRIEF DESCRIPTION OF THE FIGURES

• La FIG.1 est une vue en perspective d'un mécanisme horloger à remontage automatique, équipé d'un rotor situé du côté de l'affichage ;
• La FIG.2 est une vue en perspective éclatée du mécanisme de la FIG.1 ;
• La FIG.3 est une vue similaire à la FIG.2, montrant le mécanisme à plus grande échelle ;
• La FIG.4 est une vue en plan du mécanisme de la FIG.1 ;
• La FIG.5 est une vue en coupe du mécanisme de la FIG.4, selon le plan de couple A-A ;
• La FIG.6 est une vue en coupe du mécanisme de la FIG.4, selon le plan de coupe B-B ;
• La FIG.7 est une vue en coupe partielle du mécanisme de la FIG.4, selon le plan de coupe C-C.

Other objects and advantages of the invention will become apparent in the light of the description of an embodiment, given below with reference to the appended drawings in which:

• The FIG. 1 is a perspective view of a self-winding watch mechanism, equipped with a rotor located on the side of the display;
• The FIG.2 is an exploded perspective view of the mechanism of the FIG. 1 ;
• The FIG.3 is a view similar to the FIG.2 , showing the mechanism on a larger scale;
• The FIG. 4 is a plan view of the mechanism of the FIG. 1 ;
• The FIG.5 is a sectional view of the mechanism of the FIG. 4 , according to the AA couple plan;
• The FIG. 6 is a sectional view of the mechanism of the FIG. 4 , according to the section plane BB;
• The FIG. 7 is a partial section view of the mechanism of the FIG. 4 , according to the CC cutting plane.

DETAILED DESCRIPTION OF THE INVENTION

On the FIG. 1 an automatic watch movement 1 is represented. This movement 1 is intended to equip a wristwatch, suitable for being worn on the wrist.

Movement 1 comprises, firstly, a plate 2, which is in the form of a rigid part (preferably made of metal, for example steel), intended to form a support for various components of the movement, fixed or mobile . The plate 2 has a lower face 3 and an upper face 4, opposite the lower face 3.

The movement 1 comprises, secondly, a barrel 5 rotatably mounted relative to the plate 3 and provided with a primary toothed wheel 6. The barrel comprises a barrel shaft 7 by which the barrel is rotatably mounted on the plate 2, a barrel drum 8, and a barrel spring (not shown) secured, by an internal end, to the barrel shaft 7 and, by an external end, of the barrel drum 8.

As illustrated in particular on the FIG. 6 , the barrel is provided with a secondary toothed wheel 9 (also called a "ratchet") and distinct from the primary toothed wheel 6.

The movement 1 comprises, thirdly, a winder 10 which comprises a winding rod 11 carrying, at an external end, a winding crown 12. The winder comprises a winding mechanism 13 by which the winding rod 11 meshes, in a winding position, the secondary toothed wheel 9 of the barrel 5 to manually rotate it and thus wind the spring.

The movement 1 comprises, fourthly, a carriageway 14 mounted in rotation relative to the plate 2 around a central axis A. The roadway includes a 15 minute cannon which carries a 16 minute hand.

The roadway 14 is in gear relation with the primary toothed wheel 6 of the barrel via a gear train 17 of timer.
More specifically, and according to an embodiment illustrated in particular on the FIG. 7 , the carriageway 14 comprises a pinion 18 for the minutes, integral with the barrel 15 for the minutes (or formed in a single piece with the latter), and the gear train 17 for a timer comprises a timer wheel 19.1 meshing with the minute gear.

The timer train 17 is mounted in rotation relative to the plate 2.

The movement 1 comprises, in the fifth place, a mobile 20 for the hours, mounted in rotation relative to the plate 2 around the central axis A. The hour mobile includes a 21 hour cannon which carries a 22 hour hand.

The moving body 20 of the hours is in gear relation with the roadway 14. More precisely, and according to an embodiment illustrated on the FIG. 7 , the hours mobile comprises a pinion 23 of the hours, integral with the barrel 21 of the hours (or formed in one piece with it), and movement 1 comprises a pinion 24 which couples in rotation the hours mobile to the roadway 14 in a gear ratio R of 1/12.

• Une roue 24.1 des heures, qui engrène un pignon 19.2 de minuterie solidaire en rotation de la roue 19.1 de minuterie ;
• Un pignon 24.2 réducteur, solidaire en rotation de la roue 24.1 des heures ;
• Une roue 24.3 inverseuse, interposée entre le pignon 24.2 réducteur et le pignon 23 des heures.

More specifically, the gear 24 includes:

• A 24.1 hour wheel, which engages a timer pinion 19.2 integral in rotation with the timer wheel 19.1;
• A reduction gear 24.2, integral in rotation with the hour wheel 24.1;
• A reversing wheel 24.3, interposed between the reducing pinion 24.2 and the hour pinion 23.

• N_M la vitesse de rotation du pignon 18 des minutes (et donc de l'aiguille 16 des minutes) ;
• N_H la vitesse de rotation du pignon 23 des heures (et donc de l'aiguille 22 des heures) ;
• Z_M le nombre de dents du pignon 18 des minutes ;
• Z_H le nombre de dents du pignon 23 des heures ;
• Z1 le nombre de dents de la roue 19.1 de minuterie ;
• Z2 le nombre de dents du pignon 19.2 de minuterie ;
• Z3 le nombre de dents de la roue 24.1 des heures ;
• Z4 le nombre de dents du pignon 24.2 réducteur.

We notice :

• N _M the speed of rotation of the pinion 18 of the minutes (and therefore of the hand 16 of the minutes);
• N _H the speed of rotation of the hour pinion 23 (and therefore of the hour hand 22);
• Z _M the number of teeth of the pinion 18 of the minutes;
• Z _H the number of teeth of the pinion 23 hours;
• Z 1 the number of teeth of the timer wheel 19.1;
• Z 2 the number of teeth of the timer pinion 19.2;
• Z 3 the number of teeth on the 24.1 hour wheel;
• Z 4 the number of teeth of the reduction gear 24.2.

The gear ratio R is written: $$\mathit{R}=\frac{{\mathrm{NOT}}_H}{{\mathrm{NOT}}_M}=\frac{Z_M\times \mathrm{<figure-callout\; id="2"\; label="Z"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">Z</figure-callout>}2\times Z4}{\mathrm{<figure-callout\; id="1"\; label="Z"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">Z</figure-callout>}1\times \mathrm{<figure-callout\; id="3"\; label="Z"\; filenames="imgf0005.png,imgf0006.png"\; state="\{\{state\}\}">Z</figure-callout>}3\times Z_H}$$

The gears are chosen so that the gear ratio R is equal to 1/12. The following example provides such an R report: $$Z_M=Z_M=64;\mathit{<figure-callout\; id="1"\; label="Z"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">Z</figure-callout>}1=60;\mathit{<figure-callout\; id="2"\; label="Z"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">Z</figure-callout>}2=16;\mathit{<figure-callout\; id="3"\; label="Z"\; filenames="imgf0005.png,imgf0006.png"\; state="\{\{state\}\}">Z</figure-callout>}3=48;\mathit{<figure-callout\; id="4"\; label="Z"\; filenames="imgf0002.png"\; state="\{\{state\}\}">Z</figure-callout>}4=15$$

Pavement 14, including the 15 minute cannon and the 16 minute hand, is located on the side of the upper face 4 of the plate 2. Likewise, the 20 hour mobile, including the 21 hour cannon and the hour hand 22, is located on the side of the upper face 4 of the plate 2.

The movement 1 comprises, in sixth place, an oscillating mass in the form of a rotor 25 mounted in rotation relative to the plate 2 around the central axis A, on the same side of the plate 2 as the carriageway 14 and the mobile 20 hours - in this case on the side of the upper face 4 of the plate.

• ∘ Un moyeu 26 central, en relation d'engrenage avec le barillet 5 ;
• ∘ Une jante 27 solidaire du moyeu 26 central ;
• ∘ Un secteur 28 annulaire lourd qui est solidaire de la jante 27.

As illustrated in particular on the FIG.5 , the rotor 25 comprises:

• ∘ A central hub 26, in gear relationship with the barrel 5;
• ∘ A rim 27 secured to the central hub 26;
• Lourd A heavy annular sector 28 which is integral with the rim 27.

According to a particular embodiment, illustrated in the drawings, the rim 27 is in the form of a solid disc, but it could be perforated. In the exemplary embodiment, the rim is a solid disc made of a transparent material, e.g. in industrial sapphire.

The heavy annular sector 28 occurs for example. in the form of a half-ring made of a material whose density is greater than that of the material of the rim 27. Thus, according to a particular embodiment, the heavy annular sector is made of brass.

The attachment of the heavy annular sector 28 to the rim 27 is for example. made by screwing, riveting, crimping or bonding.

The movement 1 comprises, in seventh place, a riser shaft 29 integral with the central hub 26 and by which the latter is mounted in rotation relative to the plate 2.

The riser shaft 29 is preferably in the form of a hollow cylinder, produced for example. in steel.

The riser shaft and the central hub could form a single piece. However, in the example illustrated, the booster shaft and the central hub form two separate parts fixed to each other. According to a particular embodiment, the central hub is driven onto an upper end of the booster shaft.

As we can see on the FIG.5 , the 15 minute cannon and the 21 hour cannon are mounted coaxially around the riser shaft 29, the 16 minute hand and the 22 hour hand being located between the plate 2 and the rim 27 of the rotor .

Thus, while allowing the wearer to take advantage of the spectacle provided by the rotation of the rotor 25, this arrangement makes it possible to position the hands 16, 22 as close as possible to a dial or a crown carrying an hourly graduation, for the benefit of legibility of the hours.

• D'une bague 31 fixe par rapport à la platine 2,
• D'une bague 32 mobile en rotation par rapport à la bague 31 fixe autour de l'axe A central et dont est solidaire l'arbre 29 rehausseur, et
• D'éléments 33 roulants interposés entre les bagues 31, 32 (typiquement des billes).

According to a preferred embodiment, the movement 1 comprises a bearing 30 provided:

• A ring 31 fixed relative to the plate 2,
• A ring 32 movable in rotation relative to the ring 31 fixed around the central axis A and of which the shaft 29 booster is integral, and
• Rolling elements 33 interposed between the rings 31, 32 (typically balls).

The bearing 30 is advantageously mounted on an intermediate bridge 34 fixed to the plate 2.

In the example illustrated, the fixed ring 31 is an inner ring of the bearing 30, and the movable ring 32 is an outer ring.

• Renforcer l'arbre rehausseur en cas de chocs latéraux pouvant s'exercer sur le mouvement horloger,
• Absorber les éventuelles déformations dues au serrage de la vis 35 centrale sur la bague 31 intérieure, et ainsi garantir une bonne coaxialité de celle-ci avec l'axe A de rotation central.

As is clearly visible on FIG.5, FIG.6 and FIG. 7 , the inner ring 31 is secured to the intermediate bridge 34 by a central screw 35. In the example illustrated, an intermediate piece 36 is interposed between the central screw 35 and the inner ring 31 of the bearing 30. This intermediate piece is fixed relative to the plate 2 and provides a double function:

• Reinforce the booster shaft in the event of lateral shocks which may be exerted on the watch movement,
• Absorb any deformation due to tightening of the central screw 35 on the inner ring 31, and thus guarantee good coaxiality of the latter with the central axis of rotation A.

In the example illustrated, the riser shaft 29 is driven out on the movable ring 32 located outside the bearing.

The movable ring 32 preferably carries a toothed crown 37 in gear relation with the barrel 5, by means of a reduction gear train 38 (visible on the FIG.5 ). More precisely, the reduction gear train is in gear relationship with the secondary toothed wheel 9 (gear train) of the barrel 5.

As we can see on FIG.5 and FIG.6 , the barrels 15, 21 freely surround the riser shaft 29. To this end, the respective internal diameters of the barrels 15, 21 are greater than the external diameter of the booster shaft, at least for the part of this booster shaft located inside the two barrels.

The movement 1 advantageously comprises a socket 39 surrounding the booster shaft, this socket being fixed relative to the plate 2. The barrel 20 for the hours and the barrel 15 for the minutes are mounted on the socket. In the example illustrated, the sleeve is secured (for example by driving) to an upper bridge 40 fixed to the plate 2. More specifically, in the example illustrated, the upper bridge is fixed to the intermediate bridge 34.

The inner ring 31 of the bearing 30 is fixed to the intermediate bridge by the central screw 35, this central screw further securing to this bridge the intermediate piece 36, which has a bottom with a central hole for the passage of the central screw and a tube rigid in which the head of this central screw is located, this rigid tube being situated inside a central opening presented by the booster shaft, this booster shaft forming a rotating tube.

The upper 40 deck is clearly visible on the FIG.2 and FIG.3 . The attachment of the upper deck to the intermediate deck 34 is for example. performed by means of screws 41, here three in number. As we can see on the FIG.3 , the upper bridge is pierced with holes 42 and carries axes 43 for guiding in rotation moving parts of movement 2, and in particular components of the gear train 17 of the timer.

• Le canon 21 des heures est emboîté sur la douille 39,
• Le canon 15 des minutes est emboîté sur le canon 21 des heures.

According to a preferred embodiment:

• The gun 21 of the hours is fitted on the socket 39,
• The canon 15 of the minutes is nested on the canon 21 of the hours.

A first lanterning is advantageously provided at the interface between the socket 39 and the hour gun 21 to allow the rotation of the latter (with the hour hand 22) relative to the socket.

A second lantern is advantageously provided at the interface between the hour gun 21 and the minute gun 15 to allow the rotation of the latter (with the minute hand 16) relative to the hour canon.

As we see in particular on the FIG. 7 , the barrel 5 is mounted on the side of an internal face 44 (facing the plate 2) of the upper bridge 40 (and more precisely between the intermediate bridge 34 and the plate 2), while the roadway 14, the mobile 20 des hours and the rotor 25 are mounted on the side of an external face 45 (opposite the plate 2) of the upper bridge.

• Une roue 47 supérieure située du côté de la face 45 externe du pont 40 supérieur et en prise d'engrenage avec le rouage 17 de minuterie (et plus précisément avec le pignon 19.2 de minuterie) ;
• Une roue 48 inférieure située du côté de la face 44 interne du pont 40 supérieur, solidaire en rotation de la roue 47 supérieure et en relation d'engrenage avec la roue 6 dentée primaire du barillet 5 ;
• Un axe 49 reliant, au travers du pont 40 supérieur, la roue 47 supérieure et la roue 48 inférieure.

In order to ensure the transmission of the rotation of the barrel 5 (located on the side of the internal face 44 of the upper bridge 40) to the timer train 17, the movement 1 is advantageously equipped with a reversing mobile 46, which comprises:

• An upper wheel 47 situated on the side of the external face 45 of the upper bridge 40 and in gear engagement with the timing train 17 (and more precisely with the timer pinion 19.2);
• A lower wheel 48 situated on the side of the internal face 44 of the upper bridge 40, integral in rotation with the upper wheel 47 and in gear relation with the primary toothed wheel 6 of the barrel 5;
• An axis 49 connecting, through the upper bridge 40, the upper wheel 47 and the lower wheel 48.

According to an embodiment illustrated on the FIG. 7 , the axis 49 crosses not only the upper bridge 40 but also the intermediate bridge 34.

As illustrated in the FIG. 7 , the movement 1 can also be equipped with a small second hand 50, offset from the central axis A. The small second hand is driven on an axis 51 secured to a second wheel 52, in gear relationship with the roadway 14 in a 1/60 ratio.

In addition, as can be seen in particular on the FIG. 1 and FIG.2 , the movement 1 comprises a bearing 53, provided with a guide ring 54 which surrounds the roadway 14, and a foot 55 by which the bearing 53 is fixed to the upper bridge 40.

The movement which has just been described provides in particular the advantages mentioned below.

First, the fact that the rotor 25 is located on the same side as the time display (that is to say that the hands 15, 22) allows the wearer to enjoy the spectacle offered by the movement of the rotor. , which does not allow a provision of it opposite to the display.

Then, and unlike the majority of movements of this type, the fact that the rotor 25 overcomes the needles 15, 22 (which is made possible in particular by the presence of the booster shaft) makes it possible to position them. as close as possible to the body of the movement and a graduation of the hours which can be located on the rear face of this body, for the benefit of the readability of the display.

Finally, it will be noted that the timepiece movement which has just been described can easily also present an additional time display situated on the side of the front face of the plate 2. In the latter case, there would thus be a double display of the 'hour, the second display may for example correspond to a time zone different from that of the first display.

Claims (12)

Self-winding watch movement (1), which includes: - a plate (2), - a barrel (5) rotatably mounted relative to the plate (2) and carrying a primary gear (6), - a roadway (14) rotatably mounted relative to the plate about a central axis (A) and in gear relationship with the primary gear (6) of the barrel (5) via a gear train (17) for a timer, this carriageway (14) comprising a cannon (15) for the minutes which carries a hand (16) for the minutes, - An hour mobile (20) rotatably mounted relative to the plate about said central axis and in gear relation with the roadway (14), this hour mobile (20) comprising a cannon (21) of the hours which carries an hour hand (22), - an oscillating mass in the form of a rotor (25) mounted in rotation relative to the plate (2) around the central axis (A), on the same side of the plate as the roadway (14) and the mobile ( 20) hours, this rotor comprising: Central a central hub (26) in gear relationship with the barrel, ∘ a rim (27) secured to the central hub, ∘ a heavy annular sector (28) which is integral with the rim; this watch movement being characterized in that it comprises a booster shaft (29) integral with the central hub (26) and by which this hub is mounted in rotation relative to the plate (2); and in that the minute cannon and the hour cannon are mounted coaxially around the booster shaft which passes through them, the minute hand and the hour hand being located between the plate (2) and the rim (27) of the rotor. Clock movement (1) according to claim 1, characterized in that it comprises a bearing (30) provided with a ring (31) fixed relative to the plate (2), with a ring (32) movable in rotation , compared to the ring (31) fixed, around the central axis (A) and rolling elements (33) interposed between the two rings; and in that the booster shaft (29) is integral with the movable ring. Watch movement (1) according to claim 2, characterized in that the ring (32) movable in rotation carries a toothed crown (37) in gear relationship with the barrel (5) by means of a reduction gear train ( 38). Watch movement (1) according to claim 3, characterized in that the barrel (5) carries a secondary toothed wheel (9), distinct from the primary toothed wheel (6) and with which the reduction gear is in gear relation. Watch movement (1) according to one of claims 2 to 4, characterized in that the bearing (30) is mounted on a bridge (34) fixed on the plate (2). Clock movement (1) according to one of claims 2 to 5, characterized in that the fixed ring (31) is an inner ring and the ring (32) movable in rotation is an outer ring. Watch movement (1) according to claims 5 and 6, taken in combination, characterized in that the inner ring (31) of the bearing (30) is fixed to the bridge (34) by a central screw (35), this central connecting screw in addition to this bridge an intermediate piece (36), which has a bottom with a central hole for the passage of the central screw and a rigid tube in which the head of this central screw is located, this rigid tube being located at the inside a central opening that the booster shaft has, this booster shaft forming a rotating tube. Watch movement (1) according to one of the preceding claims, characterized in that it comprises a socket (39) fixed relative to the plate (2) and on which are mounted the hour barrel (21) and the barrel ( 15) minutes, this fixed socket surrounding the booster shaft. Watch movement (1) according to claim 8, characterized in that : - the hour barrel (21) is fitted onto the sleeve (39), - the barrel (15) of the minutes is fitted onto the barrel (21) of the hours. Clock movement (1) according to claim 8 or claim 9, characterized in that the sleeve is fixedly mounted on an upper bridge (40) which is fixed on the plate (2), this upper bridge having an internal face (44) on the side of the plate (2) and an opposite external face (45). Watch movement (1) according to claim 10, characterized in that the barrel (5) is mounted on the side of the internal face (44) of the upper bridge (40), while the carriageway (14), the mobile (20) hours and the rotor (25) are mounted on the side of the external face of this upper bridge. Watch movement (1) according to claim 11, characterized in that it comprises: - a gear train (17), in gear engagement with a pinion (18) of the minutes secured to the barrel (15) of the minutes, this gear train being mounted in rotation relative to the upper bridge (40) on the side of the external face (44) thereof, - a reversing mobile (46), which includes: Supérieure an upper wheel (47) located on the side of the external face (45) of the upper bridge and in gear engagement with the gear train (17), Inférieure a lower wheel (48) located on the side of the internal face (44) of the upper bridge and integral in rotation with the upper wheel and in gear relation with the primary toothed wheel (6) of the barrel (5), ∘ an axle (49) connecting, through the upper bridge (40), the upper wheel and the lower wheel.

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