CH716399A1 - Mechanism for displaying a horological value, in particular the date. - Google Patents

Abstract

Mechanism for displaying a horological value (1) composed of a units digit and a tens digit at least when the latter is greater than zero, said mechanism comprising: - a first axis of rotation (A1) around which are pivoted: (a) a unit wheel comprising a unit disc bearing numbers corresponding to said units; b) a tens mobile comprising a tens disc bearing digits corresponding to said tens; - a control wheel arranged to be driven in steps of 1/n turn under the control of an input wheel intended to be driven by a basic movement, n being a non-zero natural integer; - a units programming wheel arranged to be driven by said control wheel and to cause said units mobile to pivot; - a tens programming wheel, arranged to be driven by said control wheel and to cause said tens mobile to pivot; - said unit programming wheel is arranged to cooperate with said mobile unit via a first self-locking gear; - said tens programming wheel is arranged to cooperate with said tens mobile via a second self-locking gear; wherein said tens wheel set is pivoted about said first axis of rotation (A1) by means of a tens ball bearing (R1) and said units wheel set is pivoted about said first axis of rotation (A1) by the Intermediate Ball Bearing Units (R2); and wherein a first (R1; R2) of said tens ball bearing (R1) and said ones ball bearing (R2) is mounted on a bracket (3) for attachment to a frame member, a second (R2; R1) among said tens ball bearing (R1) and said units ball bearing (R2) being mounted between said tens wheel set and said units wheel set.

Description

Description

Technical area

The present invention relates to the field of watchmaking. It relates, more particularly, to a mechanism for displaying a watch value made up of two digits, which makes it possible to maximize the size of the digits.

State of the art

[0002] Displays of watch values made up of two digits most often relate to the date.

[0003] A Standard type date display mechanism comprises a date disc, typically annular in shape, bearing a series of numbers from 1 to 31 visible sequentially through a convenient aperture in the dial. This arrangement is very limited in the size of the digits which can be displayed and, in order to solve this problem, various so-called "big date" displays have been developed to improve readability. Typically, these devices include a disk of the tens, bearing digits representing the tens of the date as well as a units disk bearing the digits representing the units of the date. The displayed date therefore consists of a digit carried by the units disk as well as a digit (or, as an alternative to the number "0", a space) carried by the tens disk, these two numbers appearing through one or two apertures. Other more complicated arrangements are also known, but are not particularly relevant to the present invention and therefore will not be discussed here.

[0004] In mechanical watchmaking, a particular problem arises in terms of driving and positioning discs, when these discs reach a certain size and, therefore, a certain inertia. Indeed, if their inertia is too high, powerful jumpers are necessary so that the discs do not get out of sync in the event of an impact or during too sudden a manual correction, for example, which increases the torque necessary for their drive.

[0005] The document CH690869 presents a solution to this problem, by revealing a large date display device, in which the two discs are annular, the units disc bearing only once the series of digits from "0" to " 9" and the tens disc carrying twice the series of digits from „0" ä „3". The use of annular discs instead of more solid discs reduces their inertia, but complicates their assembly and their pivoting in the movement. Furthermore, this arrangement imposes a relatively narrow width on the digits. There is therefore an interest, at the level of the surface occupied by each digit, of being able to pivot disks near their centers. Until now, no one has proposed a satisfactory arrangement for their drive and their positioning and which makes it possible to really maximize the size of the digits, while facilitating the assembly of the mechanism.

The object of the invention is therefore to provide a display mechanism in which the defects mentioned above are at least partially overcome.

Disclosure of Invention

[0007] More specifically, the invention relates to a mechanism for displaying a horological value composed of a units digit and a tens digit at least when the latter is greater than zero, as defined by claim 1. This mechanism includes:

- a first geometric axis of rotation around which are pivoted, by appropriate means, said first axis being centered or decentered:

[0009] a) a unit mobile comprising a unit disk bearing numbers corresponding to said units;

b) a tens mobile comprising a tens disk bearing digits corresponding to said tens, the digit "0" being either represented by the digit itself, or by an empty space devoid of digit;

[0011] - a control wheel arranged to be driven in steps of 1/n revolution, directly or indirectly, under the control of an input wheel intended to be driven by a basic movement, n being a natural integer not no ;

[0012] a unit programming wheel arranged to be driven, directly or indirectly, by said control wheel and to cause said mobile unit to pivot;

[0013] - a tens programming wheel, arranged to be driven, directly or indirectly, by said control wheel and to cause said tens wheel set to rotate.

[0014] In this mechanism, said units programming wheel is arranged to cooperate with said units mobile by means of a first self-locking gear, and said tens programming wheel is arranged to cooperate with said tens mobile by via a second self-locking gear.

[0015] Said tens wheel set is pivoted around said first axis of rotation by means of a tens ball bearing and said units wheel set is pivoted around said first axis of rotation by means of a ball bearing. units, a first of said tens ball bearing and said units ball bearing being mounted

on a support intended to be fixed to a frame element, a second of said tens ball bearing and said units ball bearing being mounted between said tens mobile and said units mobile.

[0016] In other words, the possibilities for pivoting the units mobile and the tens mobile can be as follows:

- the tens mobile is pivoted on the support by the interposition of the tens ball bearing, while the units mobile is pivoted on the tens mobile by the interposition of the units ball bearing between the two said mobiles;

- the mobile of the units is pivoted on the support by the interposition of the ball bearing of the units, while the mobile of the tens is pivoted on the mobile of the units by the interposition of the ball bearing of the tens between the two said mobiles.

[0017] These constructions allow the use of discs of units and tens of relatively large size, the use of self-locking teeth being able to avoid the use of jumpers, which are energy-intensive. Consequently, the driving torque is not too high, which allows the indication of the date or other information to occupy a relatively large surface, in particular when the figures are at 3 o'clock with respect to the First axis. . Furthermore, these constructions can be designed with a relatively small number of axes of rotation and without crowns (if desired), which limits the number of bearings necessary and the bulk in the movement, and, in combination with the arrangement of the components pivoted around the first axis, facilitates assembly of the mechanism, including the indexing of the various components.

Advantageously, said mechanism further comprises an additional control wheel which is pivoted around the same axis of rotation as said control wheel and is arranged to be driven by said control wheel and to drive said programming wheels, said wheel control wheel being indexable relative to said control wheel at the rate of said step of 1/n turn by means of a jumper, which therefore ensures discrete relative angular positioning, a manual correction device being arranged to be able to pivot said control wheel additional to said control wheel. A correction of the displayed value can thus be carried out in discrete steps, and this in both directions, while maintaining the Synchronization of the mechanism.

[0019] Advantageously, said input wheel is arranged to cooperate with said control wheel by means of a third self-locking gear, which ensures the driving and positioning of the control wheel without the need for a jumper, and avoid double jumps.

[0020] Advantageously, said first axis of rotation is intended to be placed at the center of a basic movement, which makes it possible to maximize the surface occupied by the digits.

[0021] Advantageously, said tens programming wheel is arranged to cooperate with said tens wheel set via yet another additional self-locking gear, and/or said units programming wheel is arranged to cooperate with said units wheel set. via yet another self-locking gear. The training and positioning of the mobiles in question can thus be ensured without any jumper, if desired.

[0022] Advantageously, said input wheel is pivoted around said first axis of rotation and intended to be driven by a basic movement, which is preferably mechanical.

Advantageously, the mechanism comprises a second axis of rotation around which said control wheel, said units programming wheel and said tens programming wheel are pivoted. The number of axes in the mechanism can thus be minimized.

The invention also relates to a watch movement comprising a display mechanism as defined above.

[0025] Advantageously, at least one, preferably each, of the units disc and of the tens disc has an outside diameter which is greater than or equal to 75%, preferably greater than or equal to 80%, preferably greater than or equal to 90% of the diameter of a circle of maximum diameter which falls entirely within the circumference of the said movement.

[0026] Advantageously, said movement further comprises at least one time indicator hand which is arranged coaxially with said first axis of rotation, shaft or barrel of this hand passing, for example, through corresponding openings with which the mounted mobiles are provided. around the first axis.

This movement can, of course, be incorporated into a timepiece such as a pocket watch, a wristwatch or the like.

The invention also relates to a method of mounting a display mechanism as described above, in which the tens mobile is pivoted on the support and the units mobile is pivoted on the tens mobile. This method comprises the following steps for mounting elements around said first axis of rotation:

a) Indexing said unit disk to said unit wheel, these parts being intended to form part of said unit mobile;

b) Attaching said unit ball bearing to at least one element of said unit mobile, that is to say to the unit disc and/or to the unit wheel;

c) Adjusting said units ball bearing around a first among said tens wheel and said tens disc, this wheel and this disc being intended to form part of said tens mobile;

d) Indexing a second among the tens wheel and the tens disk to said first;

e) Attaching said tens ball bearing to at least one element of said tens mobile, that is to say to the tens disc and/or to the tens wheel;

f) Adjusting said tens ball bearing around a tubular or cylindrical part that comprises said support;

g) Fixing an axial thrust bearing to said tubular or cylindrical part.

[0029] In the case where the construction is reversed, that is to say where the mobile of the units is pivoted on the support and the mobile of the tens is pivoted on the mobile of the units, the steps for mounting elements around of said first axis of rotation are as follows:

a) Indexing said tens disk to said tens wheel, these parts being intended to form part of said tens mobile;

b) Attaching said tens ball bearing to at least one element of said tens mobile, that is to say to the tens disc and/or to the tens wheel;

c) Adjusting said tens ball bearing around a first among said units wheel and said units disc, this wheel and this disc being intended to form part of said units mobile;

d) Indexing a second among the units wheel and the units disc to said first;

e) Attaching said ball bearing of the units to at least one element of said mobile of the units, that is to say to the disc of the units and/or to the wheel of the units;

f) Fit said ball bearing of the units around a tubular or cylindrical part which comprises said support;

g) Fixing an axial thrust bearing to said tubular or cylindrical part.

[0030] Advantageously, said indexing of said step a) may comprise the sub-steps of:

al) Secure assembly elements, such as pins, with a first of said wheel (i.e. the units wheel or the tens wheel, as the case may be) and said disc (i.e. - say the units disk or the tens disk, if applicable);

a2) Adjusting said assembly elements in openings provided by a second among said wheel and said disc (that is to say the other element in question), in order to effect said indexing.

Advantageously, said indexing of said step d) may comprise the sub-step of:

dl) Attaching assembly elements to said wheel (i.e. the tens wheel or the units wheel, if necessary) and to said disc (i.e. the tens disc or the disc units, if applicable).

[0032] These methods are very easy for the watchmaker to implement, in comparison with those inherent in the constructions of the prior art.

[0033] Advantageously, said assembly elements comprise pins, which are preferably driven into the corresponding elements to which they are secured.

Brief description of the drawings

[0034] Other details of the invention will appear more clearly on reading the following description, made with reference to the appended drawings in which;

- Figure 1 is a transparent plan view, as well as two sectional views of the assembly of a display mechanism according to the invention;

- Figure 2 is a partial side view of the display mechanism of Figure 1, presented to an exaggerated vertical scale in order to identify the levels N1 to N9 of its construction;

- Figures 3 to 11 are sectional views of levels N1 to N9 respectively;

- Figure 12 is a transparent plan view, as well as a sectional view of the elements mounted around Tax A3;

- Figure 13 is a sectional view of the detail of the pivoting of the elements mounted around Tax A1; And

- Figure 14 is a sectional view similar to Figure 13, for a construction in which the positions of the tens and units mobiles have been reversed.

Embodiments of the Invention

[0035] Figure 1 shows overviews of an embodiment of a mechanism for displaying a watch value 1 according to the invention, which has been constructed in the form of a display mechanism of great date. Of course, other displays are possible, such as a display of the week number, the month, the year, the hours, or the like. The modifications made to the mechanism illustrated and described below to provide a display of other horological values are, of course, within the reach of those skilled in the art, there is therefore no need to describe them in detail.

[0036] Figure 1 serves in particular to identify the various axes in order to simplify the interpretation of the views in section of the various levels of the construction represented by figures 3 to 11. In the same way, figure 2 illustrates, on an exaggerated vertical scale , a side view of part of the mechanism 1, in order to identify the various levels N1 to N9.

[0037] Figures 3 to 11 show sectional views through each level N1 to N9 respectively, defined along the corresponding lines shown in Figure 2.

The mechanism will now be described by following the kinematic chains from the force entry, which is on level N2 (Figure 4). Each mobile will be identified by a reference sign made up of two digits, the first of which represents the level and the second represents the tax. Consequently, the input wheel 21 is at level 2 in rotation around Tax A1, the wheel 13 at level 1 around Tax A3, etc. Elements such as pins, axial extensions, etc., which extend from one level to another are identified by reference signs, one of the numbers of which corresponds to one of the levels in question. Thanks to this encoding of the reference signs, it is not necessary to specify in length and width the level and Tax of each element, which simplifies reading. A minor exception to this principle is found in figure 14, which represents an inverse construction to that of figure 13, but nevertheless keeps the same reference signs for the elements in question in order to facilitate understanding and to keep a single sign. reference by functional element.

[0039] It is further noted that the axes A1 to A5 are geometric axes, the pivoting of the various elements taking place by means of ad hoc means such as shafts, bushes, ball bearings, etc., of known way. With regard to Tax A1, which is at the center of mechanism 1 and which corresponds to the "first axis" in the sense of the claims, the Time Display Organs may share the same axis, their shafts and barrels passing through from the center of the elements of the mechanism 1 which pivot around the same axis. The axis A3 corresponds to the "second axis" of the claims. The mechanism 1 can, of course, be modular, taking place on the dial side of a basic movement, or can be constructed in an integrated manner.

Said power input is an input wheel 21, which is integral in rotation with an hour wheel in this case, arranged to perform one revolution per twelve hours. Other arrangements are also possible.

This input wheel 21 has four effective teeth on a base of 31 teeth. To this end, the wheel has four recesses of teeth 21a at its periphery, defining said effective teeth, three long teeth 21b (conventional) each being located between each pair of adjacent recesses 21a, the outer recesses 21a being connected by a surface of substantially constant radius lock 21c. This blocking surface 21c occupies the place of the 27 "missing" effective teeth. Thanks to the arrangement which has just been described, it is the number of tooth recesses 21a which corresponds to the number of effective teeth instead of the number of vertices, and any gear calculation is therefore relative to the number of recesses 21a. In simple terms, the four recesses 21a drive a first pinion 22 by four pitches of its toothing, therefore the number of effective teeth is four.

[0042] The input wheel 21 therefore cooperates with the first pinion 22, which has eight teeth, so that, at each rotation of the input wheel 21, the first pinion 22 performs a half-turn, therefore a full turn per day in two discrete steps of 180° which take place around 12:00 and 24:00. When the first pinion 22 is not cooperating with the four effective teeth of the input wheel 21, the sides of two of its adjacent teeth can slide on the blocking surface 21c, which holds the first pinion 22 in its angular position. The assembly of the input wheel 21 and the first pinion 22 therefore constitutes a self-locking gear, the blocking surface 21c ensuring the positioning of the pinion 22 without requiring a jumper. In general, self-locking gears help minimize energy consumption and avoid double jumps during training.

Fixed in rotation with said first pinion 22, a second pinion 12 located at level N1 (Figure 3) is mounted. This second pinion 12 comprises two effective teeth on a base of eight teeth, these two effective teeth being

constituted by two tooth hollows 12a separated by a conventional tooth 12b, the rest of the periphery of the pinion being constituted by a blocking surface 12c with a constant radius.

The second pinion 12 cooperates with a control wheel 13 having 62 conventional teeth. In this way, when the second pinion 12 performs a revolution, the control wheel 13 advances at the rate of two pitches of its teeth (thanks to the two effective teeth of the second pinion 12), the input wheel 21 being arranged with respect to the teile hour and minute hands So that the second pinion 12 drives the control wheel 13 around midnight. The control wheel 13 thus completes a complete revolution in 31 days. We therefore clearly note the difference between a disk provided with a single conventional finger projecting from its periphery, which has a single effective tooth and would thus drive the mobile downstream at the rate of a single pitch of its teeth per rotation, and the construction with two tooth recesses 12a of the second pinion 12, which has two effective teeth and therefore drives the control wheel 13 at the rate of two pitches of its teeth per rotation.

[0045] More generally, it can be considered that the control wheel 13 is designed and arranged to be driven at the rate of steps of 1/n revolution under the direct or indirect control of the input wheel 21, n being an integer non-zero natural. In the case of a date display, 1/4 or 1/31 turn per step is usual; for a week number display, 1/4 or 1/53 turn per step would be particularly suitable.

[0046] In a similar fashion to all of the rotary members 22 and 21, the teeth of the control wheel 13 cooperate with the blocking surface 12c of the second pinion 12 in order to position said control wheel 13 angularly when it is not is not being trained.

[0047] The control wheel 13 is integral in rotation with a second toothing 23bis, having 31 teeth in the form of columns or equivalents (for example, pins) extending parallel to each other from the upper face of the control wheel 13. During normal operation of the mechanism, the toothing 23bis is made integral in rotation with an additional control wheel 23 by means of a jumper 23b, 23c which is carried by the additional control wheel 23 In the illustrated variant, the jumper comprises a substantially rigid element 23c, which extends radially and whose apex enters the toothing 23a, and a substantially flexible element 23b, which takes the form of a flexible guide. The jumper is designed and arranged in such a way as to exert a force large enough to be fixed in rotation to the toothing 23bis during the automatic drive (by the basic movement) of the date, but small enough to be unindexed in rotation of the toothing 23bis during manual training (by the user, during a correction) of the date; the additional control wheel 23 can therefore be integral with or deindexed in rotation from the control wheel 13. For this purpose, the additional control wheel 23 comprises a toothing of 62 teeth, intended to be in kinematic connection with a manual correction device (not shown) through an appropriate Correction System (not shown). Such systems are well known to those skilled in the art and need not be described in detail here. By pivoting the additional control wheel 23 with respect to the control wheel 13 by means of said correction system, the angular position of one of these two wheels with respect to the other can be modified in steps of 1 /31 turn (more generally 1/n turn, as described previously), without influencing the part of the mechanism which is kinematically upstream; the kinematically downstream part will then be driven in one direction or the other. Of course, other forms of jumper 23b, 23c and teeth 23bis having the same operation are known from the prior art and can be adopted without further ado.

[0048] Furthermore, the toothing 23a serves as a guide bearing for the additional control wheel 23 which comprises an inner wall 23f extending over an arc of a circle of more than 180°, in particular approximately 270°. Consequently, this wall 23f can slide on the toothing 23bis, and the additional control wheel 23 is thus guided radially. This aspect of the construction of the elements mounted on Tax A3, as well as several other aspects, are also visible in FIG. the control wheel 13, said crown being pivoted in an ad hoc manner on the control wheel 13.

The additional control wheel 23 carries a plurality of pins 23a which make it integral in rotation with a unit programming wheel 33. Of course, any other suitable means for securing in rotation these two wheels 23, 33 can be used.

[0050] The units programming wheel 33 comprises, on a basis of 62 effective teeth, 60 effective teeth as well as a blocking surface 33c corresponding to the two "missing" effective teeth. This wheel 33 and a pinion 34 with eight teeth effective form a self-locking gear arranged so as to rotate the pinion 34 at the rate of a quarter turn at the end of each day, except one day out of 31, which corresponds to the transition between the indications "31" and "01 During this transition, the locking surface 33c prevents any rotation of the pinion 34 in the same way as already described in the context of the self-locking gears mentioned above.

The pinion 34 is integral in rotation with a unit drive wheel 64. This wheel 64 comprises four pairs of recesses 64a separated by a conventional tooth, thus defining four pairs of effective teeth. At each quarter turn, this wheel 64 drives a mobile of the units 61, 71 at the rate of two pitches of the teeth of a wheel of the units 61 which comprises 20 effective teeth and is integral in rotation with a disc of the units 71 which carries the digits of the units. Again, the gear between unit drive wheel 64 and unit wheel 61 constitutes a self-locking gear which functions analogously to the self-locking gears described above.

[0052] The disk of units 71 is pivoted on a ball bearing (see below) and has ten fingers 71a extending from its periphery and in its plane, the part of the periphery which lies between these fingers 71a presenting a constant radius. This disk is positioned by a pair of jumpers 101 which, when the disk of units 71 is in a stable position, are in contact with two of said fingers 71a, one of the jumpers preventing rotation in the clockwise direction, the other preventing counterclockwise rotation. When the disk 71 is pivoting, during almost the entire rotation, the tops of the jumpers 101 are located opposite a part of the periphery of the disk 71 with a constant radius and oppose no (or only little) resistance. this rotation until they abut against the adjacent fingers 71a at the end of a pivoting step of the disk 71. generated by the self-locking gears is small enough to avoid any angular "floating" of said disc 71.

The entire kinematic chain for driving the unit disk 71 having now been described, we return to level N4 (FIG. 6), where a tens programming wheel 43 is located. This wheel 43 is integral in rotation of the units programming wheel 33 as well as of the additional control wheel 23, again by means of the pins 23a mentioned above or by any other ad hoc means.

The tens programming wheel 43 comprises six pairs of effective teeth 43a on a base of 62 effective teeth, blocking surfaces 43c being located between each pair of effective teeth 43a. These pairs of effective teeth 43a are arranged at suitable positions on the periphery of the wheel 43 in order to drive in rotation a pinion 45 with eight effective teeth at least during the transitions between the indications "09" and "10", "19". " and „20", „29" and „30", as well as „31" and „01 ". Again, the gear between wheel 43 and pinion 45 is self-locking, as previously described, with pinion 45 making a quarter turn with each passage of a pair of effective teeth 43a.

[0055] In this case, the Series of digits for the tens comprises once the sequence "0, 1, 1, 2, 2, 3". Consequently, there are two additional trainings, to carry out the transitions between the first Digit "1" and the second Digit "1", as well as between the first Digit "2" and the second Digit "2", at ad hoc moments. Of course, the sequence of digits and, thus, the number of trainings can be different. It is, for example, possible to provide one of the following other sequences: „0, 1.2, 3", „0, 1, 1.2, 3", „0 , 0, 1, 1.2, 2, 3", „0, 1.2, 3, 0, 1.2, 3" or any other ad hoc sequence.

The pinion 45 is integral in rotation with a tens drive wheel 55, which is similar in shape to the units drive wheel 64, except that its diameter is greater. At each quarter turn, this wheel 55 drives a tens wheel set 51, 81 at the rate of two pitches of the toothing of a tens wheel 51 which has 12 effective teeth and is integral in rotation with a tens disc 81 which carries the tens digits. Again, the gear between the tens drive wheel 55 and the tens wheel 51 is self-locking, as previously described.

Similar to the units disc 71, the tens disc 81 has six fingers 81a extending from its periphery and in its plane, the part of the periphery which lies between these fingers 81a having a constant radius. A pair of jumpers 201 functions in the same way as the pair of jumpers 101 of the units disc 71, mutatis mutandis, and therefore need not be described in detail.

[0058] In the illustrated construction, the two discs 71, 81 have external diameters which are substantially identical, this diameter corresponding to more than 90% of the diameter of a circle of maximum diameter which falls entirely inside the periphery of the basic movement and/or of the dial 91. The latter, which is supported at its periphery by an arcuate support 6, is illustrated in FIG. , this figure showing the aperture 91a of relatively large size which reveals the digits making up the date (that is to say a digit or a space carried by the tens disc 81 as well as a digit carried by the units disc 71 ) at 3 hours compared to Tax A1. Of course, the window 91a can, alternatively, be located at 9 o'clock or elsewhere with respect to Tax A1, but an arrangement at 3 o'clock makes it possible to maximize the size of the digits since the ten digits of the units are arranged according to a circle of radius larger than that of the circle along which the tens digits are arranged, which are typically less numerous. It is also noted that the presence of the dial is not mandatory.

[0059] Since the tens disc 81 is superimposed on that of the units 71, the former is transparent; the disc of units 71 can be either transparent or opaque. This arrangement avoids the presence of a perceptible separation between the two digits, the tens digits being provided either on the upper face (dial side) of the tens disc 81, or on its lower face (bottom side) as disclosed in the patent EP1070996. In any case, the units numerals are typically provided on the upper face (dial side) of the units disc 71.

Of course, the construction described above only represents a non-limiting embodiment in the specific context of a large date, even if it is particularly advantageous. A person skilled in the art can in particular adapt the gear ratios, according to his needs, to display other horological values. Furthermore, the arrangement of the five axes A1-A5 may be different. For example, the elements mounted on Tax A3 can be distributed over several axes, ad hoc additional Organs can be provided in order to form all the necessary kinematic connections. Specific variants will be described below, following a description of the assembly of the elements pivoted around Tax A1.

[0061] The assembly of the various elements around Tax A1 will now be described, mainly with reference to Figure 13, which represents part of the section K-K of Figure 1, to an enlarged scale.

First, a support 3 is provided, integral with a frame element (not shown). This support comprises a disc part 3a, which extends radially at levels 3 and 4, as well as a tubular part 3b (which can alternatively be cylindrical in the case where no tree passes through it), which extends axially from the internal diameter of the disc part 3a in the direction of the dial 91. This tubular part 3b serves as a support for a tens ball bearing R1, of which a first part R1a is integral with the support 3, being clamped there by the intermediary of a retention element such as a screw 5 which is screwed onto the tubular part 3b of the support 3, and of which a second part R1b is integral with the tens wheel 51 (for example, by being driven therein, riveted, glued, welded or similar). This tens wheel 51 has an extension 51h, of which the tens disc 81 is secured by the intermediary of a plurality of pins 81g serving as assembly elements (in particular two in the illustrated embodiment, but a number higher is also possible).

[0063] A ball bearing of the units R2 comprises a first part R2a fitted around the extension 51h, the second part R2b surrounding this first part, the balls being arranged between these two parts in a known manner. The second part R2b carries the units wheel 61 (which is driven, riveted, glued, welded or similar around the part R2b) as well as the units disc 71 (which is driven, riveted, glued, welded or similar around the part R2b) which is indexed in rotation with respect to the unit wheel 61 by means of a plurality of pins 61g.

[0064] This construction is relatively simple for the watchmaker to assemble. In order to perform this assembly, the following steps can be followed:

a) Indexing said disc of units 71 to said wheel of units 61, these parts being intended to form part of said mobile of units 61, 71, for example by securing assembly elements 61g with a first among said wheel 61 and said disc 71, and fitting said assembly elements in openings that includes a second among said wheel 61 and said disc 71;

b) Secure said ball bearing units R2 to said mobile units 61,71;

c) Adjusting said unit ball bearing R2 around a first among said tens wheel 51 and said tens disc 81, this wheel and this disc being intended to form part of said tens wheel set 51, 81;

d) Indexing a second among the tens wheel 51 and the tens disc 81 to said first, for example by securing assembly elements 81g to said wheel 51 and to said disc 81;

e) Attaching said tens ball bearing R1 to said tens mobile 51,81;

f) Adjusting said tens ball bearing R1 around a tubular or cylindrical part 3b which comprises said support 3;

g) Fixing an axial stop 5 to said tubular or cylindrical part 3b.

[0065] The joining of the elements can be done by driving in, edging, gluing, welding or any other appropriate means. Moreover, the reverse actions according to the reverse order is used for the disassembly of this assembly. In addition, other processes and constructions are possible, in particular with regard to other variants for ensuring the indexing between each wheel 61 respectively 51 and its corresponding disc 71 respectively 81. The process will therefore adapt according to the means chosen to ensure indexing.

The arrangement of Figure 14 represents an inverse construction, in which the mobile of the units 61, 71 is pivoted on the support 3 via the ball bearing of the units R2, while the mobile of the tens 51, 81 is pivoted around the mobile of the units 61, 71 by means of the tens ball bearing R1. Consequently, the differences between figure 14 and figure 13 relate exclusively to the reference signs used to indicate the various elements, the reference signs for each functional element corresponding to those used previously, even if this is not in conformity with the encoding for this figure. Modifications to the kinematics upstream of these two mobiles 61, 71 respectively 51, 81 in order to compensate for these changes are within the reach of those skilled in the art and should therefore not be described exhaustively.

[0067] In order to mount this inverse construction, the watchmaker can follow the following steps:

a) Indexing said tens disc 81 to said tens wheel 51, these parts being intended to form part of said tens wheel set 51, 81, for example by securing assembly elements 81 g with a first among said wheel 51 and said disc 81, and adjusting said assembly elements in openings that includes a second among said wheel 51 and said disc 81;

b) Secure said tens ball bearing R1 to said tens mobile 51,81;

c) Adjusting said tens ball bearing R1 around a first among said units wheel 61 and said units disc 71, this wheel and this disc being intended to form part of said units mobile 61, 71;

d) Indexing a second among the wheel of units 61 and the disc of units 71 to said first, for example by securing assembly elements 61g to said wheel 61 and to said disc 71;

e) Secure said ball bearing of units R2 to said mobile of units 61,71;

f) Adjusting said ball bearing of the units R2 around a tubular or cylindrical part 3b which comprises said Support 3;

g) Fixing an axial stop 5 to said tubular or cylindrical part 3b.

[0068] Again, the joining of the elements can be effected by driving in, edging, gluing, welding or any other suitable means. Moreover, the reverse actions according to the reverse order is used for the disassembly of this assembly. In addition, other methods and constructions are also possible, as mentioned above. The process will therefore adapt according to the means chosen to ensure the indexing.

The illustrated embodiments having now been described, several other variants are also possible, as mentioned above, some of these variants being described below. Subsequently, the embodiment of Figures 1 to 13 will be referred to as "Variant 1". level is not always respected.

[0070] A second Variant (“Variant 2”) differs from Variant 1 in that:

• The unit programming wheel 33 is not secured to the additional control wheel 23, but to an additional wheel comprising 62 effective teeth which is located on another axis and which is driven, by teeth, by the additional command 23.

• The tens programming wheel 43 is not secured to the additional control wheel 23, but to an additional wheel comprising 62 effective teeth which is located on another axis and which is driven, by teeth, by the additional command 23.

• The units programming wheel 33 and the tens programming wheel 43 are therefore not integral.

The advantage of this construction is a reduced size in height, at the cost of a higher number of parts. [0072] It should be noted that the control wheel 13 could have 2n effective teeth (instead of 62 effective teeth), n being a non-zero natural whole number, and that the additional control wheel 23 could be detached from the wheel. 13 in steps of 1/n turn (instead of 1/31 turn) and include 2n effective teeth (instead of 62 effective teeth), or other, insofar as it can be ensured that the unit programming wheel 33 and the tens programming wheel 43 are adequately trained.

[0073] A third Variant (“Variant 3”) differs from Variant 1 in that:

• Entry wheel 21 is not coaxial with fax A1, pivots at the rate of one (and not two) revolutions per day (and is therefore not integral in rotation with the hour wheel), has a diameter twice as large and has two (not four) effective teeth.

• Pinion 22 is not coaxial with fax A2 and therefore rotates 1/4 (and not one) revolution per day.

• The second pinion 12 is removed; the pinion 22 therefore directly drives, by teeth, the control wheel 13.

[0074] This variant makes it possible to change the displayed value more quickly, at the cost of a higher number of coins.

[0075] A fourth Variant (“Variant 4”) is based on Variant 3, from which it differs in that:

• Pinion 22 is removed; the input wheel 21 therefore directly drives, by teeth, the control wheel 13.

• The control wheel 13 has eight (and not 62) effective teeth and therefore rotates 1/4 (and not 1/31) revolution per day.

Claims (20)

• The additional control wheel 23 has eight (and not 62) effective teeth and can be separated from the control wheel 13 in steps of 1/4 (and not 1/31) turn. The additional control wheel 23 drives, by teeth, an additional wheel which has 62 effective teeth and with which the unit programming wheel 33 is secured. This additional wheel drives, by teeth, directly or indirectly, another additional wheel which has 62 effective teeth and with which the tens programming wheel 43 is attached. • The units programming wheel 33 and the tens programming wheel 43 are therefore not integral. [0076] This variant again makes it possible to reduce the overall height, at the cost of a higher number of parts. [0077] A fifth Variant („Variant 5"), adapted to display the week number, differs from Variant 1 in that: • The input wheel 21 rotates at the rate of two revolutions per week (and not two revolutions per day) (and is therefore not integral in rotation with the hour wheel). • The control wheel 13 has 20 (and not 62) effective teeth. • The additional drive wheel 23 can be detached from the drive wheel 13 in steps of 1/10 (and not 1/31) turn. • The unit programming wheel 33 has 20 (and not 60) effective teeth on a base of 20 (and not 62) effective teeth and its toothing is therefore conventional. • The tens programming wheel 43 has two (and not 12) effective teeth on a base of 20 (and not 62) effective teeth. • The tens disc 81 has the digits „0, 1,2, 3, 4, 5" (and not „0, 1, 1,2,2, 3"). [0078] The week number can thus be displayed over a very large area, the user having to make a correction at the end of each year so that the numbers „54", „55", „56", „57", „58", „59" and „00" are not displayed. [0079] A sixth Variant (“Variant 6”) uses the construction of Variant 5, but for displaying the date. To this end, it differs from Variant 5 in that: • The input wheel 21 rotates at the rate of two revolutions per day (and not two revolutions per week) (and is therefore integral in rotation with the hour wheel). • The tens wheel 51 has eight (and not 12) effective teeth. • The tens disc 81 has the four (and not six) digits „0, 1,2,3" (and not „0, 1,2, 3, 4, 5"). [0080] However, a correction is necessary at the end of each month so that the numbers „32", „33", „34", „35", „36", „37", „38", „39" and „00" are not displayed. [0081] Although the invention has been previously described in connection with specific embodiments, other additional variants are also possible without departing from the scope of the invention as defined by the claims. Claims 1. Mechanism for displaying a watch value (1) composed of a units digit and a tens digit at least when the latter is greater than zero, said mechanism comprising: - a first axis of rotation (A1) around which are pivoted: a) a units mobile (61, 71) comprising a units disc (71) bearing numbers corresponding to said units; b) a tens mobile (51, 81) comprising a tens disc (81) bearing digits corresponding to said tens; - a control wheel (13) arranged to be driven in steps of 1/n turn under the control of an input wheel (21) intended to be driven by a basic movement, n being a non-zero natural whole number ; - a unit programming wheel (33), arranged to be driven by said control wheel (13) and to pivot said mobile unit (61,71); - a tens programming wheel (43), arranged to be driven by said control reue (13) and to cause said tens wheel set (51,81) to pivot; in which : - said unit programming wheel (33) is arranged to cooperate with said mobile unit (61, 71) by means of a first self-locking gear (64, 61); - said tens programming wheel (43) is arranged to cooperate with said mobile tens (51, 81) by means of a second self-locking gear (55, 51); wherein said tens wheel set (51, 81) is pivoted around said first axis of rotation (AI) by means of a tens ball bearing (RI) and said units wheel set (61, 71) is pivoted around said first axis of rotation (AI) through a unit ball bearing (R2); and wherein a first (R1; R2) of said tens ball bearing (R1) and said units ball bearing (R2) is mounted on a support (3) intended to be fixed to a frame member, a second (R2; R1) among said tens ball bearing (R1) and said units ball bearing (R2) being mounted between said tens wheel set (51,81) and said units wheel set (61,71). 2. Mechanism (1) according to the preceding claim, wherein said tens ball bearing (R1) is mounted between said support (3) and said tens mobile (51, 81), said units ball bearing (R2) being mounted between said tens mobile (51,81) and said units mobile (61,71). 3. Mechanism (1) according to claim 1, wherein said units ball bearing (R2) is mounted between said support (3) and said units mobile (61, 71), said tens ball bearing (R1) being mounted between said units wheel set (61,71) and said tens wheel set (51,81). 4. Mechanism (1) according to one of the preceding claims, further comprising an additional control wheel (23) which is pivoted about the same axis of rotation as said control wheel (13) and is arranged to be driven by said control wheel (13) and for driving said programming wheels (33, 43), said additional control wheel (23) being indexable with respect to said control wheel (13) at said pitch of 1/n revolution per intermediate a jumper (23b, 23c), a manual correction member being arranged to be able to pivot said additional control wheel (23) with respect to said control wheel (13). 5. Mechanism (1) according to one of the preceding claims, wherein said input wheel (21) is arranged to cooperate with said control wheel (13) by means of a third self-locking gear (21,22 , 13). 6. Mechanism (1) according to one of the preceding claims, in which said first axis of rotation (AI) is intended to be placed at the center of a basic movement. 7. Mechanism (1) according to one of the preceding claims, wherein said tens programming wheel (43) is arranged to cooperate with said mobile tens (51, 81) by means of a self-locking gear (43 , 45) additional. 8. Mechanism (1) according to one of the preceding claims, wherein said units programming wheel (33) is arranged to cooperate with said movable units (61,71) by means of a self-locking gear (33 , 34) additional. 9. Mechanism (1) according to one of the preceding claims, wherein said input wheel (21) is pivoted about said first axis of rotation (A1). 10. Mechanism (1) according to one of the preceding claims, comprising a second axis of rotation (A3) around which are pivoted: a) said drive wheel (13); b) said units programming wheel (33); c) said tens programming wheel (43). 11. Watch movement comprising a display mechanism (1) according to one of the preceding claims. 12. Timepiece movement according to the preceding claim, in which at least one, preferably each, of the units disc (71) and of the tens disc (81) has an outer diameter which is greater than or equal to 75%, preferably greater than or equal to 80%, preferably greater than or equal to 90% of the diameter of a circle of maximum diameter inscribed entirely inside the circumference of said movement. 13. Timepiece movement according to one of claims 11 and 12, further comprising at least one time indicator hand which is arranged coaxially with said first axis of rotation (A1). 14. Timepiece comprising a timepiece movement according to one of claims 11 to 13. 15. Method for mounting a display mechanism (1) according to claim 2, comprising the following steps for mounting elements around said first axis of rotation (A1): a) Indexing said unit disk (71) to said unit wheel (61), these parts being intended to form part of said unit mobile (61, 71); b) Attaching said unit ball bearing (R2) to at least one element of said mobile unit (61, 71); c) Adjusting said units ball bearing (R2) around a first of said tens wheel (51) and said tens disc (81), this wheel and this disc being intended to form part of said tens wheel set (51 ,81); d) Indexing a second of said tens wheel (51) and said tens disc (81) to said first; e) Attaching said tens ball bearing (RI) to at least one element of said tens mobile (51,81); f) Adjusting said tens ball bearing (R1) around a tubular or cylindrical part (3b) which comprises said support (3); g) Fixing an axial stop (5) to said tubular or cylindrical part (3b). 16. Method for mounting a display mechanism (1) according to claim 3, comprising the following steps for mounting elements around said first axis of rotation (A1): a) Indexing said tens disk (81) to said tens wheel (51), these parts being intended to form part of said tens mobile (51,81); b) Attaching said tens ball bearing (RI) to at least one element of said tens mobile (51,81); c) Adjusting said tens ball bearing (R1) around a first among said units wheel (61) and said units disc (71), this wheel and this disc being intended to form part of said units mobile (61 ,71); d) indexing a second of said units wheel (61) and said units disk (71) to said first; e) Attaching said unit ball bearing (R2) to at least one element of said unit mobile (61, 71); f) fitting said ball bearing of the units (R2) around a tubular or cylindrical part (3b) which comprises said support (3); g) Fixing an axial stop (5) to said tubular or cylindrical part (3b). 17. Method according to one of claims 15 and 16, wherein said indexing of said step a) comprises the following sub-steps: al) joining assembly elements (61g; 81g) with a first of said wheel (61; 51) and said disc (71; 81); a2) Adjusting said assembly elements (61g; 81g) in openings comprising a second of said wheel (61; 51) and said disc (71; 81). 18. Method according to one of claims 15 to 17, wherein said indexing of said step d) comprises the following sub-step: dl) Attaching assembly elements (81g; 61g) to said wheel (51; 61) and to said disc (81; 71). 19. Method according to one of claims 17 and 18, wherein said connecting elements (61 g, 81 g) comprise pins. 20. Method according to the preceding claim, wherein said pins are driven into the corresponding elements to which they are secured.