CH712346B1 - Display mechanism for watch. - Google Patents

Abstract

The invention relates to a clock display mechanism (1) comprising a center tube (2) fixed to a plate (3) and comprising a main bore (4) or a main guide bearing surface (5) for the guidance. in rotation, around a main axis (DP), of a display mobile (6, 8) inside or outside the center tube (2), and also relates to a clockwork motor module, a motorization group comprising several motor modules, a clockwork movement and a watch, all comprising such a display mechanism (1). This display mechanism (1) comprises an axial stop (7) arranged to limit to a predetermined value the axial play in the direction of the main axis (DP) between the center tube (2) and the display mobile. (6, 8), and which is an attached axial stop (71, 76, 98) mounted captive between the center tube (2) and the display mobile (6, 8), and which comprises a circlip (76, 98) housed both in an external groove (21, 22) which the center tube (2) comprises and in an internal groove (61, 82) which the internal or external display mobile (6, 8) comprises.

Description

Field of the invention

The invention relates to a clockwork display mechanism comprising a center tube fixed to a plate, and an interior display mobile or an exterior display mobile, which is inside or respectively outside said center tube , said center tube comprising at least one main bore or a main guide bearing surface for receiving and guiding in rotation, around a main axis, the display mobile inside or outside said center tube.

[0002] The invention also relates to a timepiece module comprising motor means arranged to drive such a display mobile, which this module comprises.

[0003] The invention also relates to a power unit for a watch, comprising a plurality of motor modules, each comprising a plate arranged for fixing said module to a clock movement, and each comprising motor means arranged to drive at least a display mobile.

[0004] The invention also relates to a timepiece movement comprising at least one such motor unit or such a module, or such a display mechanism.

[0005] The invention also relates to a watch comprising such a motorization group or / and such a display mechanism.

[0006] The invention relates mainly to the field of display for watches, in particular watches with a flat movement, as well as for watches with electro-mechanical or electronic movements.

Background of the invention

[0007] For a watch manufacturer, it is advantageous to manage the smallest possible number of different components for economic reasons. This particularly concerns display mechanisms, which generally incorporate a wide variety of components.

[0008] These display components are generally guided at the level of two structural elements: a plate, and a bridge which ensures a resumption of the pivoting of the mobiles. For example, in the case of a second center wheel, currently there is always a central bridge which takes over the pivoting of the second center wheel below the center tube in which this second center wheel pivots.

[0009] Document JP2013040942A in the name of ETA SA Manufacture Horlogère Suisse describes a watch sub-assembly comprising a spacer for guiding a pivoting mobile on a plate, with a bearing surface cooperating with a housing thereof, and a stop surface in support against the plate. It comprises a drive means fixed to the mobile, which slides relative to the spacer, with an axial flap, determined between two stop positions, one between a collar of the mobile and a front end face of the spacer , and the other between a stop surface of the drive means and a rear end face of the spacer. This mobile comprises, on the other side of the collar relative to said drive means, a machining cooperating with a complementary machining that comprises a display element for its integral attachment to the mobile.

[0010] Document EP3070538A1 in the name of NOGERAH SA describes a display mechanism, for a watch movement, comprising a first display mobile bearing a first retrograde display member and a retrograde drive device comprising a mobile of counting driven by a driving mobile, a transmission mobile cooperating, on the one hand, with the counting mobile and an elastic return member, so as to move alternately in a first direction of movement, during a first phase of operation, and in a second direction of movement, opposite, during a second phase of operation, on the other hand, with the first display mobile, via a first toothed sector. The transmission mobile comprises at least one additional toothed sector having a kinematic connection with an additional display mobile intended to carry an additional retrograde display member, in such a way that the display members are synchronized.

[0011] Document US2002 / 141292A1 in the name of Marco BETTELINI, ETA SA Manufacture Horlogère Suisse, describes the structure of a watch movement, more particularly the structure of the hour wheel, the inside of the tube of which has a bead annular cooperating with an annular groove arranged on the outer wall of the road tube. Thus, the hour wheel is snapped onto the movement, without it being necessary to provide an additional part for this purpose, and its toothed wheel cannot therefore be released from the timing pinion during transport of the movement.

[0012] Document WO2013 / 127686A1 in the name of ETA SA Manufacture Horlogère Suisse describes a clockwork movement driving at least one output shaft for receiving a display indicator of a physical or temporal magnitude opposite and to the above at least one additional indicator or a dial. This complementary indicator or dial is disposed at a local reference or support surface that the movement locally comprises around each movement output shaft, or being disposed on such a local reference or support surface. At least one such output shaft comprises, on the side of its local reference or bearing surface, a free end which is either set back, or else just flush, with respect to its local reference surface or support.

The document FR2518775A1 in the name of JUNGHANS GmbH describes a clock mechanism comprising a printed circuit board for electronic movement control assembly, and a support plate retaining the printed circuit board, for an electromechanical transducer to drive a cog for setting in motion a frame, introduced into a two-shell casing. The frame is placed, on the side of the anterior shell, in front of the support plate, while the cog is fixed, on the side of the posterior shell, behind the support plate on it, up to the small medium crossing the support plate with its pinion and penetrating into the frame. This semiconductor wafer is attached to the substantially planar conformation support plate, at a small distance therefrom, and is connected thereto by pins which are soldered to the cladding of the semiconductor wafer intended for the strips. conductive and anchored as winding connection pins in a winding core of the stator, which is supported by a stator stack of the stepper motor, positioned in the area of its rotor opening, by shape matching behind the backing plate by lying flat on it. The semiconductor wafer embraces in an arc the area occupied in front of the support plate by the large average (minute wheel) and the hours wheel of the setting and bears, in front of the rear wall of the case, next to and / or below the wheels of the train, the components of the electronic movement control assembly.

Summary of the invention

[0014] The invention proposes to provide guidance for moving bodies without an upper bridge, and thus to save a bridge stamp, tooling studies, investments, and components, and to obtain mechanisms of lesser thickness than in the prior art.

To this end, the invention relates to a clock display mechanism according to claim 1.

[0016] The invention also relates to a timepiece module according to claim 4.

The invention also relates to a power unit for a watch, comprising a plurality of motor modules, each comprising a plate arranged for fixing said module to a timepiece movement, and each comprising motor means arranged to drive at least a display mobile, according to claim 5.

[0018] The invention also relates to a timepiece movement comprising at least one such display mechanism.

[0019] The invention also relates to a watch comprising such a display mechanism.

Brief description of the drawings

[0020] Other characteristics and advantages of the invention will become apparent on reading the detailed description which follows, with reference to the accompanying drawings, where: FIG. 1 represents, schematically and in section passing through the pivot axis of the moving parts, a clockwork motor module comprising a display mechanism according to the invention, with a center tube fixedly attached to a plate, and serving as a guide for an internal mobile, center, comprising a shaft and a wheel, in particular a second mobile in the center, in a variant of the invention where this center tube and this internal mobile have a relative axial movement which is limited by a circlip housed in an outer groove of the center tube, and an inner groove of the inner mobile, formed at the level of the flange of the wheel; FIG. 2 represents, in a manner similar to FIG. 1, a similar module, further comprising a minute pavement and an hour pavement, and where the axial stopping of the interior mobile is achieved by an attached ring driven on its shaft; FIG. 3 represents, in a manner similar to FIG. 2, a module with the same configuration, and where the axial stopping of the internal mobile is produced by a circlip as in the example of FIG. 1; FIG. 4 is a purely didactic diagram intended for the visualization of the surfaces present in the different variants, also in section passing through the pivot axis of the mobiles, showing an internal mobile comprising both the two stop variants, by ring attached to its upper end, by circlips at the level of the flange of its wheel, and an external mobile pivoting on the center tube and stopped axially by a circlip; FIG. 5 is a diagram similar to FIG. 4 illustrating an alternative stopper by means of an added wedge of an external mobile mounted to pivot on the center tube; FIG. 6 is a diagram similar to FIG. 4 illustrating a variant of stopping an interior mobile, by a protruding surface that this interior mobile comprises; FIG. 7 is a diagram similar to FIG. 4 illustrating a variant of stopping an external mobile, by a protruding surface that comprises the center tube; FIG. 8 represents, schematically and in section passing through its pivot axis, an assembly comprising a needle arranged to constitute a stop attached to the shaft of the internal mobile for its axial stop, and the module carrying this internal mobile, before needle fixation; FIG. 9 represents, in a manner similar to FIG. 8, the same assembly after clipping of the needle on the shaft of the internal mobile; FIG. 10 represents, schematically and in bottom view according to arrow A of FIG. 8, the same needle before it is fixed; FIGS. 11 to 16 represent, schematically and in perspective, a motorization group comprising three motor modules, each comprising motor means arranged to drive at least one display mobile, according to the successive operations of an assembly sequence; FIGS. 17 to 23 illustrate another variant, with the assembly of three concentric cogs with the plate which acts as circlips, thus making it possible to eliminate the bridge on the back side and the bridge on the dial side; FIGS. 24 to 27, 28A, 28B, 28C, and 29 to 31, illustrate yet another variant, with the shaft of the inner mobile stopped on the end of the center tube by a driven axial stop; FIG. 32 is a block diagram showing a watch comprising a movement with such a motorization group, such a module, and such a display mechanism.

Detailed description of the preferred embodiments

The invention relates to a clockwork display mechanism 1 comprising a center tube 2, which is fixed on a plate 3, by driving, gluing, clipping, overmolding, riveting, riveting on a washer, or the like.

This center tube 2 comprises at least one main bore 4, or a main guide bearing surface 5, for receiving and guiding in rotation, around a main axis DP, of a display mobile 6, 8, inside or outside this center tube 2.

This display mechanism 1 comprises at least one axial stop 7, which is arranged to limit to a predetermined value the axial play in the direction of the main axis DP between the center tube 2 and the display mobile 6 or 8. And this at least one axial stop 7 is either a protruding surface 28, 69, of the center tube 2 or of the display mobile 6, 8, or else an attached axial stop 71, 79, 76, 98 which is either mounted prisoner between the center tube 2 and the display mobile 6, 8, or else fixed to the display mobile 6, 8.

Figures 2 and 5 illustrate a first embodiment where the axial stop comprises an attached ring, fixed on the center tube 2 or on a mobile that guides this center tube 2.

Figure 2 illustrates a variant of the invention where the display mobile is an internal mobile 6, guided in the main bore 4 of the center tube 2. The axial stop 7 is here an attached axial stop comprising a first ring 71 driven on a first bearing surface 66 of the internal mobile 6, resting on a first shoulder 67 which this internal mobile 6 comprises, at one end of the first bearing 66. This first ring 71 comprises, facing towards the plate 3, a first stop face 74 which is arranged to constitute a stop with respect to a first upper face 24 which the center tube 2 comprises. The internal mobile 6 comprises, on the side opposite to the first bearing surface 66 with respect to the plate 3, a first end face 63 which is opposite a first lower face 23 which the center tube 2 comprises. In particular, the first upper face 24 or / and the first lower face 23 is perpendicular to the main axis DP. In particular, the first shoulder 67 or / and the first end face 63 is perpendicular to the main axis DP. In particular, the first stop face 74 is perpendicular to the main axis DP.

The relative movement of the inner mobile 6 relative to the center tube 2 is thus limited to the upper level by a stop bearing cooperation between the first stop face 74 and the first upper face 24, and, at the opposite lower level at the upper level, by a cooperation in abutment support between the first end face 63 and the first lower face 23.

Figure 5 illustrates a variant of the invention, similar to that of Figure 2, but where the display mobile is an external mobile 8, guided on a main bearing surface 5 of the center tube 2. The axial stop 7 is an attached axial stop comprising a second ring 79 driven on a second bearing surface 29 of the center tube 2, resting on a second shoulder 27 which this center tube 2 comprises, at one end of the second bearing surface 29. This second ring 79 comprises, turned towards the plate 3, a second stop face 78 which is arranged to constitute a stop relative to a second upper face 88 which the outer mobile 8 comprises. The outer mobile 8 comprises, on the side opposite to the second upper face 88 and as close as possible to the plate 3, a second end face 86, which is opposite an intermediate face 26 that comprises the center tube 2. The relative displacement of the outer mobile 8 relative to the center tube 2 is limited to the upper level eur by a cooperation in abutment support between the second abutment face 78 and the second upper face 88, and, at an intermediate level located between the plate 3 and the upper level, by a cooperation in abutment support between the second face of end 86 and the intermediate face 26.

More particularly, the internal mobile 6 is a second wheel in the center, the axial strength of which is thus ensured by a ring driven onto the shaft from the needle side.

In a variant where disassembly is not envisaged, the attached ring can be driven out, glued, welded, riveted, crimped, or the like.

Figures 6 and 7 illustrate a second embodiment where the axial stop comprises a protruding surface at the level of the center tube 2 or of a mobile that guides this center tube 2.

Figure 6 illustrates a configuration where the display mobile is still an inner mobile 6 guided in the main bore 4 of the center tube 2. The axial stop 7 this time comprises a first protruding surface 69, which comprises the interior mobile 6, and which defines, facing towards the plate 3, a first stop surface 68, which is arranged to constitute a stop relative to the first upper face 24 of the center tube 2.

This protruding surface can be produced by deformation of the shaft of the internal mobile 6, or by the addition of material, or even by a local deformation created by removal of material. In a nonlimiting manner, it is possible to locally push back the material of the shaft of the internal mobile 6, to form a bead, or to pre-machine this shaft with a folding lip with a snap button, or to machine, after assembly. of the shaft of the inner mobile 6 already threaded into the center tube 2 and in lower support, peripheral craters with a laser beam just above the end face of the center tube 2, or to perform a simple bleeding of revolution, of which one of the lips forms the stop, or to carry out a plasma projection, or the welding of a point or of a series of points or of a bead, or other.

As for the variant of Figure 2, the inner mobile 6 comprises, on the side opposite the first bearing 66 relative to the plate 3, a first end face 63 opposite to the first lower face 23 that comprises the tube center 2. And the relative movement of the inner moving body 6 with respect to the center tube 2 is limited at the upper level by a stop-bearing cooperation between the first stop surface 68 and the first upper face 24, and, at the lower level opposite to said upper level, by a cooperation in abutment bearing between the first end face 63 and the first lower face 23.

Figure 7 illustrates a variant of the invention, similar to that of Figure 6, but where the display mobile is still an external mobile 8, guided on a main bearing surface 5 of the center tube 2. The stopper axial 7 is a second protruding surface 28, which the center tube 2 comprises, and which comprises, turned towards the plate 3, a second stop surface 280 arranged to constitute a stop relative to a second upper face 88 which the mobile comprises exterior 8. This second protruding surface 28 can be produced in a manner analogous to the first protruding surface 69 of FIG. 6. The outer mobile 8, comprises, on the side opposite to the second upper face 88 and as close as possible to the plate 3, a second end face 86 opposite to the intermediate face 26 of the center tube 2. The relative displacement of the outer mobile 8 with respect to the center tube 2 is limited to the upper level by a stop-bearing cooperation between the second surface e stop 280 and the second upper face 88, and, at an intermediate level located between the plate 3 and the upper level, by a stop bearing cooperation between the second end face 86 and the intermediate face 26.

Figures 3 and 4 illustrate a third embodiment where the axial stop 7 comprises at least one intermediate component, which is mounted captive between the center tube 2 and the mobile 6, 8, which guides the center tube 2 .

More particularly according to the invention, this intermediate component is an elastic component, such as circlips or the like. More particularly still, the axial stop 7 is an attached axial stop comprising a circlip 76, 98, housed both in an external groove 21, 22, which the center tube 2 comprises and in an internal groove 61, 82, which comprises mobile 6, 8.

Figure 3 illustrates a variant where the display mobile is an internal mobile 6 guided in the main bore 4 of the center tube 2. The reported axial stop is here a first circlip 76, housed both in a first external groove 21 which the center tube 2 comprises, and in a first internal groove 61 which the internal mobile 6 comprises. The relative displacement of the internal mobile 6 with respect to the center tube 2 is limited by a cooperation in abutment bearing between the first circlip 76 on the one hand, and the first lateral surfaces of internal grooves 211, 212 of the first external groove 21 and the first lateral surfaces of external grooves 611, 612 of the first internal groove 61 on the other hand.

Figure 4 illustrates a variant where the display mobile is an external mobile 8 guided on the main bearing surface 5 of the center tube 2. The reported axial stop 7 is here a second circlip 98 housed both in a second outer groove 22 which the center tube 2 comprises, and in a second internal groove 82 which the outer mobile 8 comprises. The relative displacement of the outer mobile 8 with respect to the center tube 2 is limited by a cooperation in abutment bearing between the second circlips 98 on the one hand, and the second lateral surfaces of internal grooves 221, 222 of the second external groove 22 and of the second lateral surfaces of external grooves 821, 822 of the second internal groove 82 on the other hand.

More particularly, the inner mobile 6 is a second wheel in the center, the axial strength of which is thus ensured by a circlip pre-mounted on the center tube, the second wheel then being clipped onto the circlip by its inner groove when pushing the second wheel into abutment against the center tube 2, as illustrated in Figures 11 to 16 discussed below.

In a particular embodiment of the first embodiment, and as regards only the inner mobile 6 illustrated in Figure 2, and as visible in Figures 8 to 10, the first ring 71 is formed by the barrel 710 d 'a needle 70 fitted on the internal mobile 6, resting by a surface of the end of the barrel 702 which this barrel 710 comprises, on the first upper face 24 of the center tube 2. More particularly, this barrel 710 comprises elastic lips 703 whose end constitutes the barrel end surface 702, and which are arranged to allow the clipping of an internal bead 701 which this barrel 710 comprises on a peripheral groove 60 which the shaft of the internal mobile 6 comprises, determining the dimension exact retention in axial stop.

In yet another variant, the first ring 71 is driven on a first bearing surface 66 of the shaft of the inner mobile 6, in abutment bearing on a first shoulder 67 which this inner mobile 6 comprises, at one end of the first range 66. More particularly this interior mobile 6 is a central second mobile. In this variant, it is the barrel 710 of the needle 70 which abuts on the first upper face 24 of the center tube 2. We therefore control the drive dimension, and therefore the position of the stop because the needle is driven against a shoulder.

Figures 17 to 23 illustrate another variant, with the mounting of three concentric cogs with the board which acts as circlips, thus making it possible to eliminate the bridge on the back side and the bridge on the dial side. The tubes and center pins are mounted with their riveted boards, then during vertical insertion the mobiles are clipped into position. The whole then forms an unmountable whole.

More specifically, the internal mobile 6, more particularly carrying the seconds shaft, comprises a wheel having a marking opening 603, which also defines an arm 602 carrying a flexible tongue 601 arranged to cooperate by clipping with a lower groove 206 which the center tube 2 comprises, for its axial stop, as shown in Figures 18, 19 and 20.

The outer mobile 8, more particularly the minute wheel, has a similar arrangement, and comprises a wheel having a marking opening 803, which also defines an arm 802 carrying a flexible tongue 801 arranged to cooperate by clipping with a median groove 208 which the center tube 2 comprises, for its axial stop, as shown in Figures 18, 20 and 21.

An upper mobile 80, more particularly the hour wheel, similarly to Figures 2 and 3, has a similar arrangement, and comprises a wheel having a marking opening 8003, which also defines an arm 8002 carrying a flexible tongue 8001 arranged to cooperate by clipping with an upper groove 8000 that the outer mobile 8 comprises, for its axial stop, as shown in Figures 18, 22 and 23.

Figures 17 to 23 illustrate yet another variant, with the mounting of three concentric cogs, in a mixed solution with both axial stops by driven axial stop 71 and by circlips. Here too, the bridge on the back side and the bridge on the dial side can be omitted.

More specifically, in yet another variant, shown in Figures 24 to 31, the shaft of the inner mobile 6, more particularly a seconds shaft, is stopped on the end of the center tube 2 by a driven axial stop 71, as seen in Figures 24 to 26.

The outer mobile 8, more particularly carrying the minute pavement, comprises two slots 880 making it possible to block this mobile axially with a circlip 980, above which the outer mobile 8 has a stop groove 883.

The upper mobile 80, more particularly carrying the floor of the hours, similarly to Figures 2 and 3, comprises a wheel having a marking opening, and includes a large circlip 881 already pre-mounted on the wheel, d 'a maximum diameter slightly smaller than that of this wheel, and stopped by a shoulder of the roadway 882, and, during axial insertion, the wheel snaps into position in the stop groove 883.

The circlip 881 also has a cutout, which also makes it possible to raise the level of the capacitive opening (0.15mm) on the closer board. The latter also makes it possible to gain counter-mass on the hours mobile and thus to mount an hour hand with maximized unbalance.

This improvement can also be extended to the minute wheel for needle unbalance. FIGS. 28B and 28C illustrate a variant with, again, a key 980 of large diameter, very close to that of the wheel, the angular orientation of the cutout of which corresponds, when it is mounted, to the cutout of the wheel.

The invention also relates to a timepiece module 100. This module 100 is a motor module, comprising a plate 3 arranged for fixing this module 100 to a clockwork movement 500, and which comprises motor means 101 which are arranged to drive at least one such display mobile 6, 8. According to the invention, this module 100 comprises such a display mechanism 1.

More particularly, the module 100 has the characteristics described in patent EP3185089B1 by the same applicant, relating to a motor module for a watch.

The invention also relates to a motor unit 200, comprising a plurality of motor modules, each comprising a plate 3 arranged for fixing the module concerned to a clockwork movement 500. Preferably each of these motor modules comprises motor means 101 arranged to drive at least one display mobile 6, 8. In a variant, the motorization unit 200 does not only include motor modules, but also at least one return module without motor means and comprising only one. gear wheel. According to the invention, at least one of the motor modules constituting the motorization group 200 is such a module 100 comprising a display mechanism 1, the plate 3 of which is arranged for fixing the module 100 to a clockwork movement. 500. It will be understood that such a motorization unit 200 is self-supporting, and does not require attachment to another plate, it can constitute, supplemented by energy storage means and control and piloting means, such a movement 500. This motor unit 200 can also be fixed directly in a case of a watch 1000.

In a variant, the power unit 200 comprises a plurality of modules 100, each arranged to drive at least one such display mobile 6, 8.

[0056] Thus, more particularly, the module 100 is a module for a watch, comprising power supply and control means.

More particularly, the module 100 is a motor module without a second center axis bridge.

More particularly, the motorization group 200 is a motorization group for a watch, comprising power supply and control means.

Figures 11 to 16 illustrate such a power unit 200 comprising three motor modules 100 assembled in the shape of a Y (triangular star at 120 °), each comprising motor means 101 arranged to drive at least one display mobile.

According to a particular assembly sequence, this group 200, consisting of the three modules, pre-assembled at their plates 3, receives a center tube 2 in Figure 11, a circlip 76 shown at a groove 21 of this center tube 2, then clipped, the insertion of an inner mobile 6 in the center tube 2, then the clipping of the inner mobile 6 on the circlip 76 in figure 16.

Thus, in the case of a second motor in the center alone, it is no longer necessary to have a bridge.

The invention also relates to a timepiece movement 500 comprising at least one such motor unit 200 or / and such a module 100 or at least one such display mechanism 1.

The invention also relates to a watch 1000 comprising at least one such movement 500 or at least one such display mechanism 1.

The invention provides important advantages: elimination of a packed bridge to ensure the pivoting of a single wheel; pivoting provided by a single piece, eliminating the risk of the shaft jamming in the event of a stone being misaligned with the center tube; reduction of the frolic on the second wheel, the tolerance chain is made by two dimensions, the safety height is thus reduced.

The invention lends itself particularly well to the manufacture of electromechanical watches or electronic watches, in particular communicating watches.

Claims (7)

1. Clockwork display mechanism (1) comprising a center tube (2) fixed to a plate (3), an interior display mobile (6) or an exterior display mobile (8), which is inside or outside respectively said center tube (2), said center tube (2) comprising at least one main bore (4) or a main guide bearing surface (5) for receiving and guiding in rotation, around a main axis (DP), of the interior (6) or respectively exterior (8) display mobile, said display mechanism (1) comprising at least one axial stop (7) arranged to limit the axial clearance to a predetermined value according to the direction of said main axis (DP) between, on the one hand, said center tube (2) and, on the other hand, said interior (6) or exterior (8) display mobile, characterized in that said at least one stop axial (7) is an attached axial stop (71, 79, 76, 98) which is mounted captive between said center tube (2) on the one hand and the other share said interior display mobile (6) or respectively exterior (8), and which comprises a circlip (76, 98) housed both in an external groove (21, 22) that comprises said center tube (2) and in an internal groove (61, 82) that comprises said interior display mobile (6) or respectively exterior (8). 2. Display mechanism (1) according to claim 1, characterized in that said display mechanism (1) comprises a said interior display mobile (6) guided in said main bore (4) of said center tube ( 2), and in that said attached axial stop is a first circlip (76) housed both in a first external groove (21) which said center tube (2) comprises and in a first internal groove (61) which comprises said interior display mobile (6), and in that the relative displacement of said interior display mobile (6) with respect to said center tube (2) is limited by a cooperation in abutment bearing between said first circlip (76 ) on the one hand, and the first lateral surfaces of internal grooves (211, 212) of said first external groove (21) and of the first lateral surfaces of external grooves (611, 612) of said first internal groove (61) of somewhere else. 3. Display mechanism (1) according to claim 1, characterized in that said display mechanism (1) comprises a said mobile external display (8) guided on said main bearing (5) of said center tube ( 2), and in that said attached axial stop (7) is a second circlip (98) housed both in a second external groove (22) that comprises said center tube (2) and in a second internal groove (82 ) that comprises said external display mobile (8), and in that the relative displacement of said external display mobile (8) with respect to said center tube (2) is limited by a cooperation in abutment bearing between said second circlips (98) on the one hand, and the second lateral surfaces of internal grooves (221, 222) of said second external groove (22) and of the second lateral surfaces of external grooves (821, 822) of said second internal groove (82 ) on the other hand. 4. Clock module (100), characterized in that said module (100) is a motor module, comprising a plate (3) arranged for fixing said module (100) to a clock movement (500), said module (100) comprising a display mechanism (1) according to one of claims 1 to 3, and in that and said module (100) comprises motor means (101) arranged to drive at least one display mobile interior (6) or exterior (8) that the display mechanism (1) comprises. 5. Motorization group (200) comprising a plurality of motor modules, each comprising a plate (3) arranged for fixing said module (100) to a clockwork movement (500), and each comprising motor means (101). arranged to drive at least one interior display mobile (6) or one exterior display mobile (8), at least one of said modules of which is a said module (100) according to claim 4. 6. Clockwork movement (500) comprising at least one display mechanism (1) according to one of claims 1 to 3. 7. Watch (1000) comprising at least one display mechanism (1) according to one of claims 1 to 3.