CH712273A2 - Time information retrieval system and roller display mechanism of a timepiece comprising such a system. - Google Patents

Abstract

The invention relates to a system for retrofitting (3) information including hourly information, displayed by a display mechanism of a timepiece provided with display rollers (4a, 4b, 4c, 4d ), the system (3) comprising a device for generating a retrograde rotational movement of at least one roller (4a, 4b, 4c, 4d) of the display mechanism and a device for unidirectional transmission of the retrograde rotation movement auditing at least one roll (4a, 4b, 4c, 4d).

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a catch-up system of information including a time information and a timepiece including such a system.

The invention also relates to a display mechanism of such a timepiece comprising this retrofit system.

[0003] Timepieces are known in the state of the art, including mechanisms for displaying hours of the twenty-four hour type in the form of numerical characters. Such display mechanisms generally comprise distinct display elements such as rotating disks provided with hourly indications for displaying the ten hours, the hours and minutes unit and which are controlled to display hourly information according to technical mechanisms of great complexity.

The present invention aims to propose an alternative design to existing constructions.

In this drawing, the invention relates to a catch-up system of information including a time information, displayed by a display mechanism of a timepiece provided with display rollers, the system comprising a device for generating a retrograde rotational movement of at least one roller of the display mechanism and a device for unidirectionally transmitting retrograde rotational movement to said at least one roller.

In other embodiments: the system comprises: first and second gear wheels mounted integral with each other, and / or third and fourth gear wheels mounted movably therebetween; first and second gear wheels which are in direct contact with the third and fourth gear wheels, respectively; the device for generating the retrograde rotation movement comprises: a return element, in particular a spiral spring, located on an external lateral face of a third gear wheel, and / or the return element comprises a first end which is attached to the outer side face near a peripheral area of the third gear wheel and a second end attached to a portion of the fourth gear wheel projecting from the outer side face of the third gear wheel. gear; a second gear wheel of the device for generating the retrograde rotational movement comprises a peripheral zone, part of which is devoid of teeth; first and third gear wheels are preferably similar; - The device for generating a retrograde rotation movement comprises a stop rocker adapted to allow / prohibit the realization of a retrograde rotational movement of said at least one roller; the unidirectional transmission device of the retrograde rotation movement comprises two toothed wheels coaxially aligned on one axis, the two wheels being free to rotate relative to one another in a first direction of rotation and integral with one another in a second direction of rotation opposite to the first direction, and - the first and second gears are kinematically connected with respectively said at least one roller of the display mechanism including the second roller, and the fourth gear wheel.

The invention also relates to a display mechanism of a timepiece capable of displaying information including hourly information over twenty-four hours, including such a catch-up system.

The invention also relates to a timepiece comprising a display mechanism provided with display rollers coaxially aligned with each other, said rollers each having a visible surface provided with at least one indication relating to a information including hourly information about twenty-four hours.

Advantageously, the timepiece comprises: - first, second, third and fourth rollers, and / or - first and second latches capable of generating a rotation of the rollers of the display mechanism, and / or - a cam comprising an inclined track adapted to cooperate with a free end of the second latch, and / or - such a retrofit system.

Other advantages and features of the invention will appear better on reading the description of a preferred embodiment which follows, with reference to the figures, made by way of indicative and non-limiting example: FIG. . 1 shows a view of a part of a timepiece comprising a display mechanism according to one embodiment of the invention; fig. 2 is an enlarged view of a portion of the display mechanism in which third and fourth display rollers of this mechanism are provided according to one embodiment of the invention; fig. 3 shows a longitudinal sectional view of the display mechanism made between the third and fourth rollers of this mechanism according to the embodiment of the invention; fig. 4 is a view of the fourth roller of the display mechanism comprising a pin according to the embodiment of the invention; fig. 5 is a view of a first latch of the display mechanism according to the embodiment of the invention; fig. 6 is a longitudinal sectional view of the display mechanism made between second and third rolls of this mechanism according to the embodiment of the invention; fig. 7 is an enlarged view of a cam including a cam hours of the display mechanism according to one embodiment of the invention; figs. 8 and 9 are enlarged views of a drive mechanism of the first and second rollers of the display mechanism according to one embodiment of the invention; fig. 10 shows a view of the display mechanism comprising a retrofit system according to the embodiment of the invention; fig. 11 illustrates a view of the retrofit system according to the embodiment of the invention, and FIGS. 12 and 13 show two different views of first, second, third and fourth gear wheels of a device for generating a retrograde rotation movement.

In the present description, the terms high, low, vertical, horizontal are defined with respect to the case of the timepiece 1 which is placed on a horizontal support having a flat surface.

[0012] Referring to FIG. 1, the timepiece 1 comprises an alphabetic display mechanism 2 and / or digital mechanical type and which is capable of being in kinematic relation with a gear chain 16, 18a, 18b, 20a to 20c, 17, 19 of this timepiece 1. Such a display mechanism 2 is able to generate information relating for example to time indications, dates, or any other information including alphabetic or numerical. In this configuration, the display mechanism 2 comprises in particular components such as an information retrieval system 3, rollers 4a, 4b, 4c, 4d, cogs and pinions. These components of the mechanism can be in kinematic relation with components of the movement that are capable of controlling the information displayed by this display mechanism 2.

This display mechanism 2 of the timepiece 1 thus comprises a plurality of display rollers 4a, 4b, 4c, 4d. It may, however, include at least two or at least three or at least four rollers 4a, 4b, 4c, 4d according to the information that the display mechanism 2 is intended to present.

In the present embodiment which is described, the display mechanism 2 comprises four rollers 4a, 4b, 4c, 4d for displaying the first, second, third and fourth rollers 4a, 4b, 4c, 4d intended for the display of hourly information over twenty-four hours.

These four rollers 4a, 4b, 4c, 4d are distinct from each other and are rotatably mounted around their axis of revolution in this display mechanism 2. These four rollers 4a, 4b, 4c, 4d have preferably dimensions that are similar and are coaxially aligned with each other with their axis of revolution which are merged.

These first, second, third and fourth rollers 4a, 4b, 4c, 4d comprise visible surfaces 7, in particular visible peripheral surfaces 7, comprising indications 8 such as time units, in particular for displaying time information on twenty-four hours.

Under these conditions, the unit of time is 1 second or 10 seconds or 1 minute or 10 minutes or 1 hour or 10 hours or 1 day or 10 days or 1 month or 10 months or 1 year or 10 years or 100 years or 1000 years. It will be understood here that this unit of time is here especially adapted to the information that is likely to be displayed by the display mechanism 2 which may be related to a date, a time indication or to text.

In a configuration of the display mechanism 2 which displays information relating to schedules of twenty-four hours, the first roller 4a may include indications 8 relating to dozens of hours to display. This first roll 4a is then provided for successively displaying the digits 0,1,2 and has on its visible surface 7 three series of digits ranging from 0 to 2, namely 0, 1, 2, 0, 1, 2, 0, 1 2. In these conditions, the rotation steps 13 of this roll 4a are defined by an angle of 40 °. The second roll 4b may include indications 8 relating to units of hours to be displayed. This second roll 4b is thus provided for successively displaying the numerals 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, which are inscribed on its visible surface 7 and in rotation steps 13 of FIG. this roll 4b defined by an angle of 36 °. The third roll 4c may comprise indications 8 relating to tens of minutes to be displayed. This roll 4c is then provided to successively display the digits 0, 1, 2, 3, 4, 5 and has on its visible surface 7 registered two series of digits ranging from 0 to 5, ie 0, 1, 2, 3, 4 , 5, 0, 1,2, 3, 4, 5. Under these conditions, the rotation steps 13 of this roll 4c are defined by an angle of 30 °. The fourth roll 4d may include indications 8 relating to minute units to be displayed. This fourth roll 4d is thus provided for successively displaying the numerals 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, which are inscribed on its visible surface 7 and this, according to rotation steps 13 of FIG. this roll 4d defined by an angle of 36 °.

In the context of the operation of the display mechanism 2, the first, second and third rollers 4a, 4b, 4c are movable in rotation in the same direction of rotation corresponding to the normal operating direction of these rollers 4a, 4b, 4c for the display of time information which can also be called "clockwise direction" and which is achieved by going from the front to the back. As regards the fourth roll 4d, its direction of rotation, which is the normal direction of operation of this roll 4d, is opposite to that of each of the first, second and third rollers 4a, 4b, 4c. This direction of rotation of the fourth roller 4d is also considered for the latter as a "clockwise direction of rotation" which is realized in this case from the rear to the front.

In an alternative of the display mechanism 2, the third roller 4c can have a direction of rotation which is similar to that of the fourth roller 4d being kinematic relationship with the latter via for example at least one wheel. In this context, the directions of rotation of these third and fourth rolls 4c, 4d are then considered as "clockwise direction" which are made from the rear to the front.

Note that the first, second and fourth rollers 4a, 4b, 4d each comprise a toothed wheel 9a, 9b, 9c defined for the first and second rollers 4a, 4b on a first side face 11a, and for the fourth roll 4d on a second side face 11b. The second and third rollers 4b, 4c each comprise a second lateral face 11b provided with a star wheel 10a, 10b defining their rotation steps 13. In fact, these star wheels 10a, 10b comprise teeth 12 and a gap 13 between two consecutive teeth 12 of each of these wheels 10a, 10b which forms an angle corresponding to the pitch of rotation 13. It will be noted that these star wheels 10a and 10b are able to cooperate with first and second jumpers 23, 43 of the mechanism of FIG. display 2 which are arranged between points of two consecutive teeth 12 of these star wheels 10a, 10b in particular to maintain the second and third rollers 4b, 4c in position in a rotation pitch 13 and contribute to the passage of a step of rotation 13 to another.

In this display mechanism 2, the gear chain 16, 18a, 18b, 20a to 20c, 17, 19 comprises first and second gear trains. The first gear train is in connection with an input cam 14 of the display mechanism 2 called "hours cam" which is capable of moving the first and second rollers 4a, 4b. The second gear train is in relation with an input gear 15 of this display mechanism 2 comprising a shaft provided at its two ends with two gear wheels and which is capable of driving the third and fourth rollers. 4c, 4d.

The first gear train comprises a center wheel 16, a roadway 17, an hour wheel 18a, a timer wheel 18b, a gear wheel 20a and a gear wheel 19. The second gear set also includes the center wheel 16, the roadway 17, the hour wheel 18a, the timer wheel 18b, toothed wheels 20a, 20b, 20c, in particular a wheel 20c provided with a right toothing. It will be noted that the wheels 16, 18a, 18b, 20a to 20c, the roadway 17 and the return 19 constituting these first and second gear trains are preferably included in parallel and / or horizontal planes.

In this display mechanism 2 with reference to FIGS. 1 to 5, the second gear train rotates the fourth roller 4d from the toothed wheel 9c arranged at its second side face 11b. This fourth roll 4d comprises a first lateral face 11a at which a pin 21 visible in FIG. 4, protrudes. This pin 21 is defined in this first lateral face 11a in order to cooperate with a first rocker 22 of the display mechanism 2, otherwise known as a "ratchet latch", and this, so as to participate in the drive in rotation in the direction time of the third roll 4c of a rotation step 13.

In this display mechanism 2, the first latch 22 is rotatably mounted about an axis which is parallel to the axis of revolution of the four rollers 4a, 4b, 4c, 4d of the display mechanism 2 This rotational movement of the first rocker 22 takes place in a vertical plane. This first rocker 22 comprises a pawl 24, a return element 25 such as a spring as well as first and second holding zones 26a, 26b able to bear on a limit stop 27 of the stroke of this first latch 22 defined in this display mechanism 2.

In figs. 3 and 5, the pawl 24 comprises a body of which a first portion is provided with a spout 28 adapted to cooperate with a tooth 12 of the star wheel 10b defined in the second side face 11b of the third roller 4c. The body of this pawl 24 also comprises a second part forming a return element 29 of this pawl 24, a free end of which is inserted into an orifice formed in the first rocker 22. This pawl 24 is mounted to move in vertical rotation at the level of one end of the first rocker 22. The end of the first rocker 22 comprises an activation zone 30 adapted to cooperate with the pin 21 of the fourth roller 4d. This end of the first rocker 22 comprises a stopper 31 to limit the stroke of the pawl 24 between first and second bearing zones 32a, 32b defined in the body of the pawl 24. The return element 29 of the ratchet 24 maintains the first bearing zone 32a against the stopper 31 of this first latch 22 when the pawl 24 is in a so-called rest position.

In this display mechanism 2, the first rocker 22 is in a so-called rest position when the first holding zone 26a bears against the stop 27 under the action of the return element 25 of this first 22. In this rest position of the first flip-flop 22, the pawl 24 can be arranged close to or in contact with a tooth 12 of the star wheel 10b included in the second side face 11b of the third roller 4c. This first flip-flop 22 is then able to leave this rest position under the action of the rotation of the fourth roll 4d as soon as the pin 21 comes into contact with the activation zone 30 of the end of the first flip-flop 22. Under these conditions, the first rocker 22 is then driven in a displacement in vertical rotation in the downward direction thus causing a stressing of the return element 25. During this movement, the pawl 24 passes by a rotation step 13 of the star wheel 10b of the third roller 4c where it was arranged when the first rocker 22 was in the rest position, at the next rotation pitch 13, and this, coming into contact with a tooth 12 of this star wheel 10b separating these The pawl 24 thus making contact with this tooth 12, performs a vertical upward movement of rotation by forcing the second part of the body of this pawl 24 forming the reminder element 29 and this, until the pawl 24 is no longer in contact with this tooth 12. Note that when the pawl 24 makes such a movement its travel can be limited by the stopper 31 of the first flip-flop 22 which comes into contact with its second support zone 32b. As soon as the pawl 24 is no longer in contact with this tooth 12, the return element 29 brings the pawl 24 back to its rest position with the spout 28 which is arranged in this pitch 13 of the star wheel 10b. .

Subsequently, as soon as the pin 21 is no longer in contact with the activation zone 30 of the first latch 22 due to the rotation of the fourth roller 4d, the latter is then released and returns to its rest position thereby driving the starwheel 10b through the pawl 24 which is arranged in the rotation step 13 and whose spout 28 comes into contact with the tooth 12 separating the two rotation steps 13. Note that in this embodiment, the pin 21 releases the first flip-flop 22 when the fourth roller 4d which displays the minute units has completed a full revolution in ten minutes and displays the number "0". It is therefore understood that the pin 21 cooperates with the activation zone 30 of the first latch 22 before the completion of this complete revolution by the fourth roller 4d. The first jumper 23 thus passes to the next rotation step 13 and therefore the third roller 4c also.

In an alternative, the display mechanism 2 may be devoid of such a first latch 22. In such a configuration, the third roller 4c is then in kinematic relation with the fourth roller 4d via for example at least one wheel and this, so as to perform a complete revolution for example in this alternative in two hours.

In this display mechanism 2 and with reference to FIGS. 6 to 9, the cam 14 is driven in a rotational movement by the first gear train of the timepiece 1 and is thus able to perform a complete revolution in one hour. This cam 14 comprises an upper face which is provided with an inclined track 33, for example a helical track, having a difference in level between a so-called start zone 34a of this track 33 corresponding to the beginning of a revolution of the cam 14 and a so-called arrival zone 34b corresponding to the end of this turn.

The display mechanism 2 comprises a second flip-flop 35 mounted to rotate about an axis which is parallel to the axis of revolution of the rollers 4a, 4b, 4c, 4d, with a displacement of this second flip-flop 35 included in a vertical plane. This second flip-flop 35 comprises a free end 36 in particular provided with a roller, which is defined to traverse the track 33 by sliding and / or rolling when the cam 14 makes a rotational movement. When the free end 36 of this second flip-flop 35 moves on the track 33 starting from the departure zone 34a towards the arrival zone 34b, it carries out a progressive vertical rotation movement upwards as its free end 36 moves away from the departure zone 34a or that the latter approaches the arrival zone 34b. This second flip-flop 35 comprises a return element 37 which acts on the second flip-flop 35 so as to keep its free end 36 in contact with said track 33. This return element 37 comprises an end resting on a pin 38 defined on the body of the second flip-flop 35.

This second flip-flop 35 comprises a pawl 39 provided with a body, a first portion comprises a spout 40 adapted to cooperate with a tooth 12 of a star wheel 10a of the second roller 4b. This pawl 39 is mounted mobile in vertical rotation on the second flip-flop 35 about an axis of rotation which is parallel to that of this second flip-flop 35. The body of this pawl 39 also comprises a second portion which is inserted into an opening 41 of the second flip-flop 35 and which is connected to a return element of this pawl 39. This opening 41 of the second flip-flop 35 preferably has an oblong section having a radius of curvature, which limits the stroke of the pawl 39 between first and second opposed bearing zones defined at the ends of this opening 41. The pawl return element 39 maintains the second part of the pawl 39 bearing against the first bearing zone of the opening 41 of this second flip-flop 35 when the pawl 39 is in a so-called rest position. The spout 40 in the rest position of the pawl 39, can be positioned close to or in contact with a tooth 12 of the star wheel 10a included in the second side face 11b of the second roller 4b.

The second flip-flop 35 is able to make a displacement between a so-called high position and a so-called low position under the action of the return element 37 and the displacement of its free end 36 provided with a roller on the track. 33 of the cam 14. More precisely, when the second lever 35 is in the low position, its free end 36 is then arranged at the starting zone 34a which corresponds to the beginning of a revolution of the cam 14. that is, the first second of a unit of time displayed on the second roll 4b. In this configuration, as this end 36 travels along the track 33 to the arrival zone 34b, the second flip-flop 35 makes a displacement in vertical rotation towards the high position, thus generating a stressing of the return element 37 This high position corresponds to the end of the revolution of the cam 14 or a complete revolution of the latter, that is to say, the last second of the hour unit displayed on the second roller 4b.

During this movement, the pawl 39 passes a rotation pitch 13 of the star wheel 10a of the second roller 4b where it was arranged when the second latch 35 was in the rest position, at the next rotation pitch 13 and this, by coming into contact with a tooth 12 of the star wheel 10a separating these two rotation steps 13. Thus in contact with this tooth 12, the pawl 39 performs a vertical downward movement by constraining the return element connected to the second part of the body of this pawl 39, and this, until the pawl 39 is no longer in contact with the tooth 12. Note that when the pawl 39 realizes such a movement its course can be limited by the second support zone of the opening 41 of the second flip-flop 35 which comes into contact with the second part of the body of this pawl 39. As soon as the pawl 39 is no longer in contact with this tooth 12 , the recall element brings back the pawl 39 in its rest position in this rotation step 13 of the star wheel 10a of the second roller 4b.

Subsequently, as soon as the free end 36 of the second latch 35 is located in the arrival zone 34b, it returns to the departure zone 34a by making a fall to the height difference that there is between these two zones 34a, 34b in particular under the action of the biasing member 37 which is constrained and the rotation of the cam 14. This drop causes a vertical rotation displacement of the second lever 35 downwards which has for the effect of driving the same star wheel 10a through the pawl 39 which is arranged in this pitch 13 and whose spout 40 comes into contact with the tooth 12 between the two rotation steps 13. Note that in this embodiment, the fall is achieved when the cam 14 has completed a complete revolution in one hour. The second jumper 43 thus passes to the next rotation step 13 and therefore the second roller 4b also.

In this display mechanism 2 in Figs. 8 and 9, the second roll 4b is defined to perform a complete revolution in ten hours. The toothed wheel 9b of this second roller 4b comprises an outer face 44 on which are included a pawl 45 and a biasing element for maintaining the pawl 45 in a rest position. This pawl 45 is mounted in vertical rotation on the outer face 44 of this toothed wheel 9b. It is provided with a body comprising a spout 46 adapted to cooperate with a tooth 12 of a first starwheel 47a fixedly mounted at one end of a shaft 48 whose other end comprises a second starwheel 47b cooperating with a third jumper 49 of the display mechanism 2. This shaft 48 also comprises a toothed wheel 50 cooperating with the toothed wheel 9a included on the first side face 11a of the first roller 4a.

The pawl 45 also comprises first and second bearing zones 51a, 51b defined at the lateral edge levels of the pawl 45. The biasing element maintains the first bearing zone 51a of the pawl 45 against a central stop 52 defined on the outer face 44 of the toothed wheel 9b of the second roller 4b when the pawl 45 is in a so-called rest position. In the rest position of the pawl 45, the spout 46 can be positioned near or in contact with a tooth 12 of the first starwheel 47a.

During the displacement of the second roller 4b, the pawl 45 which is in its rest position is then driven by the latter so that its nose 46 comes into contact with a tooth 12 of the first star wheel 47a causing and the rotation of the latter as well as those of the second starwheel 47b and the toothed wheel 50 which are included on the same shaft 48 as the first starwheel 47a. The toothed wheel 50 of this shaft 48 which is engaged with the toothed wheel 9a of the first roller 4a causes rotation of the first roller 4a which displays the ten hours at the next rotation step 13 after the second roller 4b has made a turn complete in ten hours, so that it has the indication 8 relating to the number "0". It will be noted that the spout 46 of the pawl 45 comes into contact with the tooth 12 of the first starwheel 47a before the completion of this complete turn by the second roller 4b. In addition, during the rotation of the second starwheel 47b, the third jumper 49 moves to the next rotation step 13 and holds the first roller 4a in position until the next rotation.

With reference to FIGS. 10 to 13, the display mechanism 2 also comprises the catch-up system 3 of information including a time information, displayed because mechanism 2. This retrofit system 3 is in particular implemented in this embodiment when it is at the end of the day that the time display in twenty-four hours changes from the display to 23:59 at 00:00.

This retrofit system 3 comprises a device 5 for generating a retrograde rotational movement of at least one roller 4a, 4b, 4c, 4d of the display mechanism 2 and a unidirectional transmission device 6 of the movement of retrograde rotation to said at least one roller 4a, 4b, 4c, 4d.

The device 5 for generating a retrograde rotational movement comprises an input shaft 53 for transmitting the movement in kinematic relation with the toothed wheel 9c arranged on the second lateral face 11b of the fourth roller 4d via a third gear train. gear. This third gear train comprises a gear 54 meshing with a planetary gear 55 comprising an output shaft provided with a toothed wheel in kinematic relation via a reduction gear 56 with a gear wheel 57 of the input shaft 53. This gear wheel 57 is fixedly mounted on this shaft 53 and is located at a first end thereof.

This shaft 53 comprises a second end comprising two gear wheels 58a, 58b: a first and a second gear wheel 58a, 58b. The first gearwheel 58a is fixedly mounted on this shaft and the second gearwheel 58b is movably mounted thereon. These first and second gear wheels 58a, 58b are coaxially aligned on this shaft 53. It will be noted that the axes of revolution of the shaft 53 and of these first and second gear wheels 58a, 58b are parallel to those of first, second and third and fourth rolls 4a, 4b, 4c, 4d.

The first and second gear wheels 58a, 58b are secured to one another by being fixed together by means of fasteners 60 such as screws. It should be noted that these fixing elements 60 can make it possible to adjust the relative positions of the first and second gear wheels 58a, 58b with each other in particular to parameterize the instant of triggering of the retrograde rotational movement.

The first and second gear wheels 58a, 58b comprise peripheral zones provided with different numbers of teeth. It will be noted in particular that the peripheral zone of the second gear wheel 58b comprises a portion 61 which is devoid of teeth.

The first gear wheel 58a has a diameter which is smaller than that of the second gear wheel 58b. These first and second gear wheels 58a, 58b perform a rotational movement at the same angular velocity and in particular a complete revolution in twenty-four hours in one day.

The system 2 also comprises third and fourth wheels 58c, 58d which are mounted on an axis being in particular coaxially aligned. These third and fourth gear wheels 58c, 58d are not integral with each other, they are indeed mounted movably with each other on this axis. These third and fourth gear wheels 58c, 58d are in direct contact with the first and second gear wheels 58a, 58b, respectively.

The first and third gear wheels 58a, 58c are preferably similar having the same diameters and numbers of teeth. These first and third gear wheels 58a, 58c thus perform a rotational movement at the same angular velocity.

In contrast, the second and fourth gear wheels 58b, 58d do not have the same diameters and numbers of teeth. These second and fourth gear wheels 58b, 58d thus perform a rotational movement at different angular speeds. The fourth gear wheel 58d having a diameter smaller than that of the second gear wheel 58b, then has a higher angular velocity than that of the second wheel 58b. Note also that the angular velocity of the fourth gear wheel 58d is greater than those of the first and third gear wheels 58a, 58c which are similar to that of the second wheel 58b.

The retrofit system 3 comprises a return element 62 such as a spiral spring, located on an outer side face 59 of the third gear wheel 58c. This restoring element 62 comprises two ends of which a first is fixed on this external lateral face 59 near the peripheral zone of this third gear wheel 58c and a second end attached to a part of the fourth gear wheel 58d making protrusion on the outer side face 59 of the third wheel 58c.

In this retrofit system 3, the unidirectional transmission device 6 of the retrograde rotation movement comprises first and second toothed wheels 63a, 63b mounted on an axis. These two toothed wheels 63a, 63b are coaxially aligned on this axis. They are mounted on this axis and are free to rotate relative to each other in a first direction of rotation and integral in a second direction of rotation opposite to the first direction. These two toothed wheels 63a, 63b which are of different diameters with a first gear 63a which has a diameter greater than that of the second gear 63b, can be joined by an element such as a ball bearing.

The second gear 63b is in kinematic connection with the fourth gear wheel 58d and the first gear 63a meshes with a toothed wheel 64 of this unidirectional transmission device 6. This gear wheel 64 is mounted free to rotate on the shaft 48 and is engaged with the toothed wheel 9b of the second roller 4b. Thus, the first and second gears 63a, 63b are kinematically connected respectively to the second roller 4b and the fourth gear wheel 58d.

Thus in this configuration, the first, second, third and fourth gear wheels 58a, 58b, 58c, 58d of this retrofit system 3 are driven in a rotational movement while being in kinematic relation with the gear wheel. 9b of the fourth roller 4d through the third gear of the display mechanism 2. In these conditions, the fourth gear wheel 58d which has an angular speed greater than those of the first, second and third wheels of gear 58a, 58b, 58c, arms the biasing member 62 which creates a return torque by being rotated in a first direction by the second gear wheel 58b which meshes with it. The fourth gear wheel 58d being in kinematic connection with the second gear wheel 63b of the transmission device

Claims (10)

unidirectional 6 drives this second gear 63b in a rotational movement in this first direction. In this first direction, the second gear 63b performs a free rotation movement relative to the first gear 63a of this transmission device 6. When the teeth of this fourth gear wheel 58d are no longer engaged with those of the second gear wheel 58b being located in the portion 61 of the peripheral zone of this second gear wheel 58b which is toothless, then the fourth wheel 58d is released from this second wheel 58b. By being thus released, the return torque generates a retrograde rotational movement of this fourth gear wheel 58d in the second opposite direction to the first direction, as long as the teeth of this fourth gear wheel 58d are not in position. direct connection with those of the second gear wheel 58b. The fourth gear wheel 58d being kinematically connected to the first gear 63a of the unidirectional transmission device 6 then drives this first gear 63a in a rotational movement in this second direction. In this second direction of rotation, the second gear 63b rotates integrally with the first gear 63a of the device 6. Thus the first gear 63a drives the second roller 4b via the gear wheels 9b, 64. This second gear roll 4b then carries out the retrograde rotation movement which thus causes it to move in rotation in a counterclockwise direction, that is to say a direction contrary to its clockwise direction, and this, passing from the indication 8 "3" of the unit of hours at indication 8 "9". It is therefore understood that this retrograde rotation movement is a rotational movement which is applied to at least one roller 4a, 4b, 4c, 4d of the display mechanism 2 and which is contrary to the direction of rotation otherwise called sense of rotation. time rotation, performed by the roller 4a, 4b, 4c, 4d in the context of normal operation of the display mechanism 2. In other words, this retrograde rotation movement is a counterclockwise rotation movement for said at least one roller 4a, 4b, 4c, 4d. In the case of the present embodiment, the clockwise direction of the second roller 4b is implemented by performing a rotational movement from the front to the rear and the anticlockwise rotation direction thereof is performed during a rotation movement from the back to the front. Note that the intensity of this retrograde rotation movement is configurable from particular variations of the characteristics of the return element 62 and / or the extended in the peripheral zone of the second gear wheel 58b of the portion 61 which is toothless of this wheel 58b. The retrofit system 3 is configured to perform this retrograde rotation movement of the second roller 4b according to a particular position of the second lever 35. In fact, the retrofit system 3 comprises a stop rocker 65 mounted mobile in rotation about an axis which is parallel to the axis of revolution of the rollers 4a, 4b, 4c, 4d of the display mechanism 2, with a displacement in a vertical plane. This stop rocker 65 comprises a first holding zone 66a which is able to bear under the constraint of a return element on an adjustable stop 67 such as an eccentric, defined on the second flip-flop 35 of the display mechanism. 2. This stop rocker 65 also comprises a second holding zone 66b which is able to allow / prohibit the realization of the retrograde rotation movement being located at the star wheel 10a of the second roller 4b. Thus, this retrograde rotation movement of the second roller 4b is coordinated with the displacement of the second flip-flop 35 which controls that of the stop rocker 65. When this second flip-flop 35 is in the so-called high position, the wheel star 10a is then free to perform the retrograde rotation movement. Indeed in this high position of the second flip-flop 35, the stop rocker 65 and in particular its second holding zone 66b, is disengaged from the star wheel 10a of the second roller 4b. Moreover in this position, the system 2 comprises a cam 68 which is adapted to perform a rotational movement to lift the second jumper 43 to remove it from the rotation pitch 13 of the star wheel 10a in which it is arranged to thus facilitate the realization of this retrograde rotation movement. Following the realization of this retrograde rotation movement, the cam 68 rotates in order to release the jumper 43 so that it is arranged in a rotation pitch 13 of the star wheel 10a. When the second rocker 35 under the action of its return member 37 performs a vertical displacement from the high position to the low position, it then drives the star wheel 10a via the spout 40 of the pawl 39 which comes into contact with the tooth 12 of this star wheel 10a then causing a passage of the second roller 4b of the indication 8 "9" of the hours unit to the indication 8 "0". Note that in the context of the operation of this retrofit system 3, the passage from the indication 8 "9" of the hour unit to the indication 8 "0" of the second roller 4b is similar to that implemented by the display mechanism 2 each time the second roll 4b performs a complete revolution. This passage is also accompanied by the passage of the first roller 4a which is coordinated with the second roller 4b, at the next rotation pitch 13. Thus, by including such a retrofit system, the display mechanism is then able to present a time display in twenty-four hours capable of passing from a display at 23:59 to a display at 00:00. 1. Retrofit system (3) for information including hourly information, displayed by a display mechanism (2) of a timepiece (1) provided with display rollers (4a, 4b, 4c, 4d), the system (3) comprising a device for generating (5) retrograde rotational movement of at least one roller (4a, 4b, 4c, 4d) of the display mechanism (2) and a unidirectional transmission device (6) of the retrograde rotational movement to said at least one roller (4a, 4b, 4c, 4d). 2. Retrofit system (3) according to the preceding claim, characterized in that the device (5) for generating the retrograde rotation movement comprises: - first and second gear wheels (58a, 58b) mounted integral with each other, and / or - third and fourth gear wheels (58c, 58d) mounted to move together. 3. retrofit system (3) according to any one of the preceding claims, characterized in that first and second gear wheels (58a, 58b) are in direct contact with respectively third and fourth gear wheels (58c , 58d). 4. Retrofit system (3) according to any one of the preceding claims, characterized in that the device (5) for generating the retrograde rotation movement comprises: - a return element (62) including a spiral spring, located on an outer side face (59) of a third gear wheel (58c), and / or - the biasing member (62) comprises a first end which is secured to the outer side face (59) in the vicinity of a peripheral area of the third gear wheel (58c) and a second end attached to a portion of the fourth gear wheel (58d) projecting from the outer side face (59) of the third gear wheel (58c ). 5. Retrofit system (3) according to any one of the preceding claims, characterized in that: - a second gear wheel (58b) of the device (5) for generating the retrograde rotation movement comprises a peripheral zone including a part (61) is free of teeth, and / or first and third gear wheels (58a, 58c) are preferably similar, and / or - the device for generating (5) retrograde rotational movement comprises a stop rocker (65) adapted to allow / prohibit the realization of a retrograde rotation movement of said at least one roller (4a, 4b, 4c, 4d). 6. retrofit system (3) according to any one of the preceding claims, characterized in that the unidirectional transmission device (6) of the retrograde rotation movement comprises two toothed wheels (63a, 63b) coaxially aligned on an axis, the two wheels (63a, 63b) being free to rotate relative to each other in a first direction of rotation and integral with each other in a second direction of rotation opposite to the first direction. 7. Retrofit system (3) according to the preceding claim, characterized in that the first and second gears (63a, 63b) are in kinematic connection with respectively said at least one roller (4a, 4b, 4c, 4d) of the mechanism display (2) including the second roller (4b), and the fourth gear wheel (58d). 8. Display mechanism (2) of a timepiece (1) capable of displaying information including a twenty-four hour hourly information, comprising a retrofit system (3) according to any one of the preceding claims. . 9. Timepiece (1) comprising a display mechanism (2) provided with display rollers (4a, 4b, 4c, 4d) coaxially aligned with each other, said rollers (4a, 4b, 4c, 4d) comprising each a visible surface (7) provided with at least one indication (8) relating to information including a twenty-four hour hourly information. 10. Timepiece (1) according to the preceding claim, characterized in that it comprises: - first, second, third and fourth rollers (4a, 4b, 4c, 4d), and / or - first and second flip-flops (22, 35) adapted to generate a rotation of the rollers (4a, 4b, 4c, 4d) of the display mechanism (2), and / or - a cam (14) comprising an inclined track (33) capable of cooperating with a free end (36) of the second rocker (35), and / or - a retrofit system (3) according to any one of claims 1 to 7.