阅读说明：本技术 用于手表的具有滚轮的显示机构 (Display mechanism with roller for watch ) 是由 A·佐格 E·格勒 于 2017-07-05 设计创作，主要内容包括：本发明涉及一种用于手表(1000)的钟表显示机构(100),其包括：滚轮(10,11,12,13,14),该滚轮围绕主轴线(D10)枢转并且包括活板(20),每个活板均围绕平行于主轴线(D10)的次级轴线(D20)枢转并且具有两个面(201；202)；用于使滚轮(10,11,12,13,14)围绕主轴线(D10)枢转的第一驱动装置(31)；以及第二驱动装置(32),该第二驱动装置用于在次级轴线(D20)相对于主轴线(D10)的确定位置使活板(20)围绕其次级轴线(D20)枢转,并且至少一个所述滚轮(10,11,12,13,14)具有经由包括多个所述面(201,202)的所述活板(20)实现的至少一个固定显示位置和至少一个可变显示位置。(The invention relates to a timepiece display mechanism (100) for a watch (1000), comprising: a roller (10, 11, 12, 13, 14) pivoting about a main axis (D10) and comprising flaps (20) each pivoting about a secondary axis (D20) parallel to the main axis (D10) and having two faces (201; 202); a first drive (31) for pivoting the roller (10, 11, 12, 13, 14) about a main axis (D10); and second drive means (32) for pivoting the flap (20) about its secondary axis (D20) in a determined position of the secondary axis (D20) with respect to the main axis (D10), and at least one of said rollers (10, 11, 12, 13, 14) having at least one fixed display position and at least one variable display position realized via said flap (20) comprising a plurality of said faces (201, 202).)

1. Timepiece display mechanism (100) comprising at least one wheel (10, 11, 12, 13, 14) pivoting about a wheel axis (D10), the wheel (10, 11, 12, 13, 14) comprising at least one flap (20) pivoting about a flap axis (D20) parallel to the wheel axis (D10) and distinct from the wheel axis (D10), the at least one flap (20) comprising at least one first face (201) and at least one second face (202), the timepiece display mechanism (100) comprising first drive means (31) for pivoting the wheel (10, 11, 12, 13, 14) about the wheel axis (D10), wherein the timepiece display mechanism (100) comprises second drive means (32) distinct from the first drive means (31), the second drive means (32) being intended to cause at least one flap axis (D20) to be in at least one determined position relative to the wheel axis (D10) -the flaps (20) being pivoted about their flap axes (D20), said timepiece display mechanism being characterized in that at least one of said rollers (10, 11, 12, 13, 14) has at least one fixed display position and at least one variable display position realized via said flap (20) comprising a plurality of said faces (201, 202).

2. Timepiece display mechanism (100) according to claim 1, characterised in that the constant rotation of the flap (20) is calculated from the scroll wheels (10, 11, 12, 13, 14) so that in the display position visible to the user, the indication of the flap (20) rotates by 180 ° every revolution of the scroll wheels (10, 11, 12, 13, 14).

3. The timepiece display mechanism (100) according to claim 1, characterised in that the second drive means (32) are arranged to pivot only one flap (20) at a time and independently of the other flaps (20) comprised in the rollers (10, 11, 12, 13, 14).

4. The timepiece display mechanism (100) according to claim 1, characterised in that the second drive means (32) are arranged to cause each of the flaps (20) comprised in the rollers (10, 11, 12, 13, 14) to pivot synchronously.

5. the timepiece display mechanism (100) according to claim 3, characterised in that the second drive means (32) are arranged to pivot a single flap (20) in a single specific position of the flap axis (D20) with respect to the roller axis (D10).

6. Timepiece display mechanism (100) according to claim 1, characterised in that the second drive means (32) comprise at least one flap drive pinion (35) at each flap (20), the flap drive pinion (35) being centred on the flap axis (D20) and being arranged to cooperate with control means included in the timepiece display mechanism (100) in order to alter the position of successive flaps (20) of the same roller (10, 11, 12, 13, 14) in sequence or continuously, or to alter the position of a specific flap (20) as required.

7. The timepiece display mechanism (100) according to claim 1, characterised in that, in order to keep each flap (20) in an oriented position, each flap comprises a flap cam (25) or a heart comprising as many low points (26) as there are faces (201, 202) that the flap (20) has; and the roller (10, 11, 12, 13, 14) comprises at least one spring (15) arranged to exert a force on a jump spring (17) located in the vicinity of each flap cam (25) or heart-piece to position the flap cam (25) or heart-piece or to form the jump spring (17).

8. The timepiece display mechanism (100) according to claim 1, characterised in that, in order to keep each flap (20) in its oriented position, each flap comprises a flap cam (25) or a heart comprising as many low points (26) as there are faces (201, 202) that the flap (20) has; and the roller (10, 11, 12, 13, 14) comprises at least one magnet (70) for each flap cam (25) or heart, arranged to exert a force on the flap cam (25) or heart made of magnetic material to position the position of the flap cam (25) or heart.

9. the timepiece display mechanism (100) according to claim 1, characterised in that the first drive means (31) comprises a control wheel (3120, 3130) some of the teeth of which have been removed and which meshes with a roller drive pinion (312, 313) directly or via a pair of reduction gears (3131) in order to obtain the desired reduction.

10. The timepiece display mechanism (100) according to claim 1, characterised in that the first drive means (31) comprise an input train (61) driving a main wheel (60) one revolution of which corresponds to the duration of the display time of the rollers (10, 11, 12, 13, 14) and which carries a main cam (50) carrying peripheral sections of different geometry, comprising a concentric section (51) corresponding to the fixed display position, and a recessed section (52) provided with a drive pin (5X) corresponding to the variable display position of the display rollers (10, 11, 12, 13, 14), the main cam (50) cooperating with an eccentric maltese cross secondary cam (40) pivoted about a fixed point and arranged to pivot when the recess (52) and the drive pin (5X) pass, the secondary cam (40) carries a secondary wheel (42) which meshes with a roller drive wheel (62), and the main wheel (60) also carries a main flap drive wheel (63) which in turn meshes with a flap pinion (64) arranged to control or in fact form the flap drive pinion (35) centred on the flap axis (D20).

11. The timepiece display mechanism (100) according to claim 1, characterised in that the first drive means (31) comprise an input train (61) driving a main wheel (60) one revolution of which corresponds to the duration of the display time of the rollers (10, 11, 12, 13, 14) and which carries a main cam (50) carrying peripheral segments of different geometries, comprising a concentric segment (51) corresponding to the fixed display position, and a segment containing drive means (53) close to a recess (52), the main cam (50) cooperating with an eccentric star wheel (71) which pivots about a fixed point and is arranged to pivot when the drive means (53) pass, and to remain in the angular position of the star wheel when two teeth (72) comprised in the star wheel rest on the concentric segment (51), the star wheel (71) carries a secondary wheel (70) which meshes with a roller drive wheel (62) which in turn is integral with the roller (10, 11, 12, 13, 14), and the main wheel (60) also carries a main flap drive wheel (63) which in turn meshes with a flap pinion arranged to control or in fact form a flap drive pinion (35) centred on the flap axis (D20).

12. A watch (1000) comprising at least one timepiece display mechanism (100) according to claim 1.

Technical Field

The invention relates to a timepiece display mechanism comprising at least one roller (roller) pivoting about a roller axis, the roller comprising at least one flap (flap) pivoting about a flap axis parallel to and distinct from the roller axis, the at least one flap comprising at least one first face and at least one second face, the display mechanism comprising first drive means for pivoting the roller about the roller axis, wherein the display mechanism comprises second drive means distinct from the first drive means for pivoting at least one of the flaps about its flap axis in at least one determined position of the flap axis about the roller axis.

The invention also relates to a watch comprising at least one such display mechanism.

The present invention relates to the field of timepiece display mechanisms, in particular for watches, and more particularly to calendar display mechanisms.

Background

The legibility of the display device is a major consideration in the manufacture of timepieces, particularly calendar-type display devices which are difficult to make in a form that is easy for the user to view and recognize.

Timepiece displays are rarely made using rollers, since indicating devices in this form require a great thickness due to the diameter of the rollers, which include, for example, indications of up to 31 days of the month, or 52 days of the year, and are not compatible with the particular geometry of the watch.

Moreover, if very small-sized characters are used, it is necessary to use a magnifying glass in the thickness of the watch-glass, which is very disadvantageous to the aesthetic appearance of the watch, while still being difficult to read.

Static displays using flaps or blades for miniature clocks and other clocks are difficult to transfer to watches because they generally rely on gravity. They are more fragile and do not withstand impact.

Us patent 3964428 in the name of ARAI KIYOYUKI describes an indicating device with a rotating flap which on both sides has, at the periphery of the drum, means for guiding the flap held in a tangential orientation. During rotation of the drum, a mechanism allows the flap to flip around its axis.

Disclosure of Invention

The present invention proposes to develop a display device using a wheel having an easy-to-read time indication means despite the limited diameter of the wheel.

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

The invention also relates to a watch comprising at least one such display mechanism.

Drawings

Other features and advantages of the present invention will become apparent upon reading the following detailed description and upon reference to the drawings in which:

Figure 1 shows a schematic front view of a watch comprising a roller display mechanism according to the invention of the calendar type.

Fig. 2 shows, in a similar manner to fig. 1, a date display device according to the invention with a flap on the tens and units rollers.

Fig. 3 shows, in a similar manner to fig. 1, a gear train driving the tens roller of fig. 2.

FIG. 4 shows, in a similar manner to FIG. 1, a gear train driving the unit rollers of FIG. 2.

Fig. 5 schematically shows an end view of the unit roller of fig. 2 in a plane perpendicular to the axis of rotation of the roller, wherein the pivoting state of one of the flaps of the roller is shown in dashed lines.

Fig. 6 shows a detail of the unit roller of fig. 5 in a similar manner to fig. 1.

Fig. 7 shows, in a similar manner to fig. 5, a variant of the unit roller of fig. 2, showing means for actuating and retaining the flaps, wherein the pivoting state of one of the flaps of the roller is shown in dashed lines.

Fig. 8 shows a detail of the unit roller of fig. 7 in a similar manner to fig. 1.

Fig. 9 shows a schematic perspective view of the unit roller of fig. 7.

Figures 10 and 11 schematically show a section view and an end view, respectively, of the unit roller of figure 7 in an intermediate position, in a plane perpendicular to the axis of rotation of the roller, in which is shown the spring also visible in figure 9, arranged to exert a force on the jumper spring arranged in the vicinity of the flap cams for positioning (index) the position of these cams and of the respective flaps.

Figures 12 to 14 show, in a similar way to figures 9 to 11, a lunar calendar roller according to the present invention.

Fig. 15 shows the rotation of the unit roller with five flaps in a similar way to fig. 3 and 4.

Fig. 16 shows, in a similar way to fig. 15, the rotation control of a particular wheel with seven indications corresponding to the days of the week.

Fig. 17 shows, in a similar manner to fig. 7, a further variant of the unit roller of fig. 2, showing a device for the actuation and magnetic retention of the flaps, wherein the pivoting state of one of the flaps of the roller is shown in dashed lines.

Fig. 18 shows a detail of the unit roller of fig. 17 in a similar manner to fig. 8.

figures 19 and 20 show another variant comprising a partial toothing alternative to the maltese cross system described above.

Fig. 21 shows, in a similar way to fig. 5, a variant in which the positioning of the position of the flap cam is achieved by a single spring which also acts as a jumper spring.

Figures 22 to 26 schematically show a variant of the display for leap years:

Fig. 22 shows in perspective view a tripod hand at 120 ° over the extension of the axis of the lunar calendar roller;

Figure 23 shows, in a section perpendicular to this axis, a spider held by a jumper spring driving a tripod hand;

figures 24 and 25 show, in a similar way to figure 23 (but without showing the jumper spring), the cooperation of the star wheel via an eccentric rod integral with the flap for its driving;

Figure 26 is an end view from the side of the tripod pointer.

Fig. 27 shows, in a similar manner to fig. 7, a further variant for retaining the flap without using a jumper spring, in which the drive is effected by a partial toothing and the guidance is effected by an outer circumference which is in contact with the actual flap.

Detailed Description

The invention is shown in a non-limiting manner in the figures with rollers for the day of the week, for the date (tens and units rollers) and for the month's calendar.

For example, fig. 1 shows, in a non-limiting manner, a watch comprising a wheel, on which the height of the characters is greater than 2.20mm, on a wheel diameter of 5.00 mm.

The invention therefore concerns a timepiece display mechanism 100 including at least one wheel 10 pivoting about a wheel axis D10, said at least one wheel having different reference numbers in the figures: 11. 12, 13 and 14. The roller 10, 11, 12, 13, 14 comprises at least one flap 20 mounted to pivot about a flap axis D20 parallel to the roller axis D10 and distinct from the roller axis D10. The at least one flap 20 includes at least one first side 201 and at least one second side 202 arranged so that only one of these sides is visible to a user at any given time.

The display mechanism 100 comprises a first drive 31 for pivoting the roller 10, 11, 12, 13, 14 about a roller axis D10.

The display mechanism 100 comprises a second drive means 32, which is distinguished from the first drive means 31, for pivoting at least one such flap 20 about its flap axis D20 in at least one determined position of the flap axis D20 relative to the roller axis D10.

More particularly, in display mechanism 100, the constant rotation of flap 20 is calculated from the scroll wheels 10, 11, 12, 13, 14 such that, in the display position visible to the user, the indication of flap 20 for each revolution of scroll wheels 10, 11, 12, 13, 14 is rotated by 180 °.

More particularly, the second actuating means 32 are arranged to pivot only one flap 20 at a time, independently of the other flaps 20 comprised in the rollers 10, 11, 12, 13, 14.

In another variant, the second drive means 32 are arranged to pivot each flap 20 comprised in the rollers 10, 11, 12, 13, 14 simultaneously. This may save energy required for the display mechanism.

In a variant, which is preferred because less space is used, in which the second drive means 32 are arranged to pivot only one flap 20 at a time, more particularly the second drive means 32 are arranged to pivot only a single flap 20 in one particular position of the flap axis D20 relative to the roller axis D10.

According to the invention, at each flap 20, the second driving means 32 comprise at least one flap driving pinion 35 centred on the flap axis D20. The flap drive pinion 35 is more particularly arranged to cooperate with control means comprised in the display mechanism 100 in order to alter the position of successive individual flaps 20 of the same roller 10, 11, 12, 13, 14 in sequence or continuously, or to alter the position of a particular flap 20 as desired. Thus, the position of a particular flap may be altered as desired.

More particularly, the motorization of the second driving means 32 or the control effected via the watch stem or the pressing, pulling, etc., facilitates the updating of the calendar when the watch has been stopped for a long time.

More particularly, in order to keep each flap 20 in a certain orientation position, each flap comprises a flap cam 25, in particular a heart-shaped piece, which comprises as many low points (low points)26 as there are faces 201, 202 that the flap 20 has. The rollers 10, 11, 12, 13, 14 preferably comprise at least one spring 15 arranged to exert a force on a jumper spring 17, which jumper spring 17 is arranged in the vicinity of each flap cam to position the position of said flap cam 25, as seen in fig. 9 and 11.

In one particular variant, as shown in fig. 21, the paired structure constituted by the jumper spring and the spring is advantageously replaced by at least one spring 15 having a particular shape, in particular a single spring as shown, which combines the two functions of spring and jumper spring and replaces all the jumper springs 17 of the variants of fig. 9 and 11.

In a variant of similar function, more particularly, in order to keep each flap 20 in a certain orientation position, each flap comprises a flap cam 25 or heart, which comprises as many low points 26 as the flaps 20 have, faces 201, 202, and the rollers 10, 11, 12, 13, 14 comprise, for each flap cam 25 or heart, at least one magnet 70 arranged to exert a force on the flap cam 25 or heart made of magnetic material to position the flap cam 25 or heart, as seen in fig. 17.

More particularly, as shown in fig. 3 and 4, the first drive means 31 comprise control wheels 3120, 3130, some of the teeth of which have been removed, and which mesh with the roller drive pinions 312, 313, either directly or via a reduction gear 3131 (to obtain the desired reduction). This makes it possible in particular to display the date.

More particularly, at least one wheel 10, 11, 12, 13, 14 has at least one fixed display position and at least one variable display position via a flap 20 comprising a plurality of faces 201, 202, as seen in fig. 16. This makes it possible to make a scroll wheel display device with various indications with a reduced volume.

More particularly, the first drive means 31 comprise an input train 61 driving a main wheel 60, one revolution of said main wheel 60 corresponding to the display time period of the rollers 10, 11, 12, 13, 14, and said main wheel 60 carrying a main cam 50, the main cam 50 carrying peripheral sections 51 separated by recesses 52, the peripheral sections 51 having unequal amplitude, wherein the shortest amplitude corresponds to a fixed display position and the longest amplitude corresponds to a variable display position. The main cam 50 cooperates with an eccentric maltese cross secondary cam 40 arranged to pivot as the recess 52 passes. The secondary cam 40 carries a secondary wheel 42 which engages with a roller drive wheel 62. The main wheel 60 also carries a main flap drive wheel 63, which main flap drive wheel 63 in turn meshes with a flap pinion 64, which flap pinion 64 is arranged to control or in fact form a flap drive pinion 35 centred on a flap axis D20.

The invention also relates to a watch 1000 comprising at least one such display mechanism 100.

The drawings illustrate specific embodiments of the invention.

FIG. 2 shows a date display on a scroll wheel. Since it is not possible to display 31 days on the circumference of a roller of 5mm diameter or the like, the units and tens are distributed over two rollers: the tens wheel 12 has four digits and the units wheel 13 has ten digits.

The two rollers are driven by two control wheels 3120 and 3130, each having 31 teeth, but corresponding to dates on which rotation of the respective roller is not required, some of the teeth having been removed.

Fig. 3 shows the drive train for the tens wheel 12: the first drive means 31 comprise a first control wheel 3120, of which 31 theoretical teeth there are only 4 teeth, to drive the four teeth of the four-tooth star wheel 312, which drives the tens roller 12. A jumper spring (not shown) is required to maintain the position of the four-tooth star wheel 312 and perform the drive function.

Fig. 4 shows the drive train for the units roller 13: the first drive means 31 comprise a second control wheel 3130 comprising only a fraction of the 31 theoretical teeth, according to the type of display formed, to drive the unit pinion 313, which drives the 10 teeth of the unit roller 13. Second control wheel 3130 may thus comprise 30 teeth or, as shown here, 29 teeth, wherein two missing teeth make it possible to cancel the rotation of one bit when changing from 31 to 01. A jumper spring (not shown) is required to maintain the position of the ten-tooth unit pinion 313 and to maintain the display position.

These driving principles are similar to the well-known principles of large aperture date display devices.

Fig. 5 and 6 show the unit display on the unit roller 13. Ten bits distributed over the circumference of a 5mm diameter roller do not allow a sufficiently large character size. The unit roller 13 according to the invention therefore comprises a plurality of flaps 20A, 20B, 20C, 20D, 20E, each carrying at least two of the unit numbers on at least two of their opposite faces 201, 202. In the present example, the unit roller 13 is thus divided, and five flaps 20 with two faces carry the 10 units. These flaps 20 present alternately their two faces 201 and 202 to the user and make it possible to double the height of the ones bit character.

Figures 7 to 11 show the rotation of the flap 20 and its holding in place during the rotation of the carrier roller 10 and during the rotation of the flap 20 itself.

The flap 20 can be driven to rotate continuously at a rate of 1/2 relative to the rotation of the roller 10. This solution is simple, but requires space over the entire circumference of the roller 10, which is not always possible.

in order to limit the space occupied by the system, it is advantageous to make use of a solution that controls the rotation of the flap 20 at only one point on the circumference of the roller 10. Each flap 20 is thus held in position by a jumper spring 17, the jumper spring 17 cooperating with a flap cam 25, in particular of the heart-piece type, having two positions, mounted on the axis of the flap concerned, the low points 26 of said flap cam 25 cooperating with projecting portions of the jumper spring 17. Spring 15, particularly a spring with multiple arms as shown in fig. 7, exerts a force on jumper spring 17 that maintains the position of flap 20. A pinion 35 is also mounted on the axis of the flap 20.

Which can be driven by a gear train (not shown) included in the second drive means 32. In the particular variant of fig. 7, the second drive means 32 comprise a fixed toothed segment at one point on the outer circumference of the roller 10. During the rotation of the roller 10, the flap pinion 35 comes into contact with this section and cooperates, which causes a 180 ° rotation of the associated flap 20.

Figures 12 to 14 show in a similar way the rotation of a calendar roller comprising six flaps 20. Of course, to achieve 12 indications on the circumference, four flaps with three faces, or three flaps with four faces, may also be used.

Figure 15 shows the rotation of the unit roller with five flaps. As described above, rotation of the units roller may be achieved by having a thirty-one gear missing one or two teeth for passage of a ten-tooth pinion. For a roller with five flaps, a ten-tooth pinion should be reduced to five teeth for 1/5 revolutions per day, however, this reduction is geometrically not feasible for its function. Therefore, it is necessary to add a gear reduction action by a pair of reduction gears 3132, 3133 in accordance with a desired reduction. In the present example, the different wheels of the gear train realize:

3130 with 31 teeth: rotate for 1 circle per month

3132 with 10 teeth: rotate for 1 circle every 10 days

3133 with 20 teeth: rotate for 1 circle every 10 days

313 with 10 teeth: turn 1 turn every 5 days.

In a particular embodiment with maltese crosses, the first driving means 31 comprise an input train 61 driving a main wheel 60, one revolution of said main wheel 60 corresponding to the display time period of the rollers 10, 11, 12, 13, 14, and said main wheel 60 carrying a main cam 50, said main cam 50 carrying peripheral sections with different geometries, comprising a concentric section 51 corresponding to a fixed display position, and a recessed section 52 provided with a driving pin 5X corresponding to a variable position of the display rollers 10, 11, 12, 13, 14. Said main cam 50 cooperates with an eccentric maltese cross secondary cam 40 pivoted about a fixed point and arranged to pivot as the recess 52 and the pin 5X pass. This secondary cam 40 carries a secondary wheel 42 which meshes with a roller drive wheel 62, and the main wheel 60 also carries a main flap drive wheel 63, this main flap drive wheel 63 in turn meshing with a flap pinion 64, this flap pinion 64 being arranged to control the flap drive pinion 35 centred on the flap axis D20 or to actually form the flap drive pinion 35.

More particularly, fig. 16 shows a particular variant of such a maltese cross embodiment, for controlling the rotation of a wheel with seven indications corresponding to the days of the week. In the case of a week, since the number of days is a prime number, it is not possible to distribute it over the leaves as simply as before. If the wheel cannot be displayed on the circumference for 7 days, the scheme is limited:

-a roller with six fixed positions and a flap with two faces;

-a roller with five fixed positions and two flaps with two faces;

-a roller with four fixed positions and three flaps with two faces;

A roller with one fixed position and two flaps with three faces.

Figure 16 depicts a first variant comprising a roller with six fixed positions and one flap with two faces. Adjustments to other variations may be accomplished in a similar manner. The first drive means 31 comprise an input train 61 driving a main wheel 60, one revolution of said main wheel 60 corresponding to the display time of the wheel 10, the main wheel 60 being driven for 1/7 revolutions per day during the application of a display revolution.

More generally, for a display of N periods, the main wheel 60 is driven through 1/N revolution per day.

The main wheel 60 carries a main cam 50 divided into N distinct peripheral sections. These peripheral sections have different geometries: the concentric section 51 corresponds to a fixed display position, while the recessed section 52 provided with the drive pin 5X corresponds to a variable position of the display roller. Furthermore, the angular amplitude of the concentric sections 51 may be varied, as will be seen below.

the primary cam 50 cooperates with the maltese cross secondary cam 40 via the pins and notches described above. The secondary cam 40 is eccentric, pivots about a fixed point, and is arranged to pivot as the recess 52 and pin 5X pass.

The secondary cam 40 carries a secondary wheel 42 which engages with a roller drive wheel 62, said roller drive wheel 62 being integral with the associated display roller 10.

Thus, the secondary maltese cross cam 40 drives the roller drive wheel 62 to 1/6 revolutions for 6 out of 7 days, which corresponds to six fixed positions of the roller.

on day seven, the shoulder 41 of the secondary maltese cross cam 40 remains resting on the longest section 510 of the concentric sections 51, and the secondary maltese cross cam 40 is therefore unable to pivot. The roller drive wheel 62 is not driven and the roller therefore remains stationary.

The main wheel 60 also carries a main flap drive wheel 63, which main flap drive wheel 63 in turn meshes with a flap pinion 64, which flap pinion 64 is arranged to control or in fact form the flap drive pinion 35 centred on the flap axis D20.

Like the main wheel 60, the main flap drive wheel 63 rotates 1/7 turns per day.

The flap pinion 64 carries a flap 20 having two faces and meshes with the main flap drive wheel 63 at a rate of 3.5.

Thus, when the roller drive wheel 62 is stationary and the main wheel 60 rotates 1/7 revolutions, the flap pinion 64 rotates 1/2 revolutions and the flap 20 changes sides.

When the roller drive wheel 62 is released and rotates 1/6 revolutions and the main wheel 60 rotates 1/7 revolutions, the flap pinion 64 rotates 1/12 revolutions so that it will return to its starting point within six days.

Fig. 17 and 18 show an advantageous variant of the invention in which the jumper spring and the spring ensuring that the flap is held in place are replaced by a magnet 70, which magnet 70 exerts a force, in particular an attractive force, on the cam made of magnetic material.

In another particular embodiment with a partial toothing instead of the maltese cross system described above, the first drive means 31 comprise an input train 61 driving a main wheel 60, one revolution of said main wheel 60 corresponding to the display time period of the rollers 10, 11, 12, 13, 14, and said main wheel 60 carrying a main cam 50 with peripheral segments of different geometry: a concentric section 51 corresponding to a fixed display position, and a section comprising drive means 53 adjacent to the recess 52. The main cam 50 cooperates with an eccentric star wheel 71, said eccentric star wheel 71 pivoting about a fixed point and being arranged to pivot when such a drive means 53 passes through, and to remain in its angular position when the two teeth 72 comprised therein rest on the concentric section 51. The star wheel 71 carries a secondary wheel 70 which engages with a roller drive wheel 62, said roller drive wheel 62 being integral with the rollers 10, 11, 12, 13, 14. As mentioned above, the main wheel 60 carries a main flap drive wheel 63, which main flap drive wheel 63 in turn meshes with a flap pinion arranged to control or in fact form the flap drive pinion 35 centred on the flap axis D20.

More particularly, fig. 19 and 20 show a variant of this embodiment comprising partial teeth. This variant is shown for one particular non-limiting case of a solution, in which there are 5 fixed positions, comprising two variable flaps 20B and 20E with two faces, and without a maltese cross.

The drive pinion (not shown) of the input train 61 makes one revolution per day and the drive main wheel 60 makes 1/N revolution per day, here 1/7 revolutions.

the main wheel 60 carries the main cam 50, which main cam 50 is divided into 7 distinct peripheral segments, which may or may not include a drive means (here formed by teeth 53), wherein the concentric segment 51 corresponds to a fixed display position of the wheel 20 and the segment with the drive means 53 corresponds to a variable position of the display wheel.

The main cam 50 cooperates with a four-tooth star wheel 71 held by a jumper spring (not shown). The four-tooth star wheel 71 is eccentric, pivots about a fixed point and is arranged to pivot when the drive means, in particular the teeth in the non-limiting embodiment illustrated, pass.

The drive means 53, here comprising teeth, preferably in combination with the recesses 52, are arranged to mesh with the teeth 72 of the four-tooth star wheel 71. However, the four-tooth star wheel 71 cannot rotate when two consecutive teeth 72 of the four-tooth star wheel 71 simultaneously rest on the concentric section 51.

Thus, the four-tooth star wheel 71 pivoting on the plate is set to rotate 1/4 revolutions per day, except for two days per week. In the illustrated example, once the star wheel 71 has pivoted from monday to tuesday, it remains in its position on tuesday and wednesday until changing position between tuesday and thursday. Similarly, when the star wheel 71 has pivoted from friday to saturday, it remains in its position on saturday and sunday before changing position between sunday and monday. Flap 20B will show the first position on tuesday, will pivot 180 deg. from tuesday to wednesday, and will show the second position on wednesday. Similarly, flap 20E will show the first position on Saturday, will pivot 180 from Saturday to Sunday, and will show the second position on Sunday. On other days, the user will see a fixed display at the periphery of the scroll wheel 20: 20A on Monday, 20C on Thursday, and 20D on Friday.

This four-tooth star wheel 71 carries a secondary wheel 70 which meshes with the roller drive wheel 62, the roller drive wheel 62 itself being integral with the display roller 10.

Thus, the four-tooth star wheel 71 drives the roller drive wheel 62 to rotate 1/5 revolutions for 5 out of 7 days, which corresponds to 5 fixed positions of the roller.

On the other two days, the four-tooth star wheel 71 remains resting on the concentric section 51 and therefore cannot pivot. The roller drive wheel 62 is not driven and the roller 10 therefore remains stationary.

The main wheel 60 also carries a main flap drive wheel 63, which main flap drive wheel 63 in turn meshes with a flap pinion arranged to control or in fact form the flap drive pinion 35 centred on the flap axis D20.

Like the main wheel, the main flap drive wheel 63 rotates 1/7 turns per day.

The flap pinion carries flaps 20B and 20E having two faces and meshes with the main flap drive wheel 63 at a rate of 3.5.

Thus, when the roller drive wheel 62 is stationary and the main wheel 60 rotates 1/7 revolutions, the flap pinion rotates 1/2 revolutions and the associated flap 20 changes sides.

When the roller drive wheel 62 is released and rotates 1/5 revolutions and the main wheel 60 rotates 1/7 revolutions, the flap pinion rotates 1/10 revolutions so that it will return to its starting point within 5 days.

Fig. 22 to 26 schematically show a variant of the leap year display 400. This leap year display 400 can be realized with one or more hands, in particular but not exclusively with a three-legged hand 401 at 120 ° in the example of the figure, which is in the extension of the calendar roller spindle 402, facing a complementary leap year display 403, this complementary leap year display 403 comprising in particular the usual signs such as 1, 2, 3, L or B, etc. The spider 404, held by the jumper spring 405, drives the tripod pointer 401 and itself by an eccentric lever 406 integral with a flap 407. In the illustrated example, the rotation of the star wheel 404 occurs via an eccentric lever 406 integral with a flap 407 for march/september. When the flap 407 is pivoted via the toothed segment 408, the latter pushes the star wheel 404 through a notch, as shown in fig. 24 and 25. The roller wheel rotates one turn in six months, and the eccentric rod does not cause the star wheel to rotate in July months.

Fig. 27 shows another variant of retaining flap 407 without using a jumper spring, where the drive is performed by a partial toothing and is guided by an outer circumference 420 in contact with the actual flap 407. In particular, as shown in fig. 27, the flap 407 is guided in position by two teeth 410, 411 of its driving pinion 409. The drive pinion 409 may present one or more missing teeth at the recess 412 to facilitate its function. Advantageously, the support is achieved on the outer or inner guide circumference of the part by two teeth delimiting a rotation circumference intersecting said guide circumference. This intersection limits the rotation of the roller on its axis. The guiding circumference is interrupted over the portion 421 allowing rotation. This rotation is controlled by a toothed segment 408 provided for this purpose. As shown, the tooth section 408 may form a portion of the guide circumference 420.

Similarly, in a variation of the flap without a jumper spring, the flap may be guided directly by the outer circumference in contact with the actual flap. In this way, the guiding circumference is interrupted to allow the passage of the flap. The drive pinion can thus have the configuration of the variant of fig. 7 to 11 or of the variant of fig. 17 and 18.

The different variants of the invention make it possible to make a roller display device for all types of indications in the reduced volume of a watch of conventional dimensions, in particular a total thickness of about 10mm on the outside of the watch mirror or of the watch mirror and back cover. The flaps do not come into contact with any part of the watch and do not undergo any impact or friction during their normal operation.