阅读说明：本技术 设置有安全装置的回跳时计显示机构 (Rebound timepiece display mechanism provided with a safety device ) 是由 M·登登 于 2021-05-20 设计创作，主要内容包括：设置有安全装置的回跳时计显示机构。本发明涉及用于表的回跳时计显示机构,包括用于显示信息的轮,该显示轮由驱动指以规则的时间间隔驱动,该驱动指由轮承载,该轮转而由钟表机芯驱动,以便使由回跳时计显示机构显示的信息从一个值改变为紧随的值,该回跳时计显示机构还包括中间校正装置,该中间校正装置允许表的所有者通过在驱动显示轮的校正指上作用而手动校正由回跳时计显示机构提供的信息,回跳时计显示机构还包括安全装置,该安全装置布置为允许通过在当由回跳时计显示机构显示的信息中发生改变时并且当驱动指与显示轮接合时的时间段期间,阻止校正指驱动显示轮而阻挡中间校正装置。(A rebound timepiece display mechanism is provided with a safety device. The invention relates to a display mechanism for a timepiece of the rebound type, comprising a wheel for displaying information, the display wheel being driven at regular time intervals by a driving finger, the drive finger is carried by a wheel which is rotated to be driven by the timepiece movement, so as to change the information displayed by the display mechanism of the rebound timepiece from one value to the value immediately following, the display mechanism of a rebound timepiece further comprising intermediate correction means allowing an owner of the watch to manually correct information provided by the display mechanism of the rebound timepiece by acting on the correction finger driving the display wheel, the display mechanism of the rebound timepiece further comprising safety means, the safety device is arranged to allow blocking of the intermediate correction device by preventing the correction finger from driving the display wheel during a period of time when a change occurs in the information displayed by the display mechanism of the rebound timepiece and when the drive finger is engaged with the display wheel.)

1. A rebound timepiece display mechanism (1) for a timepiece, comprising a wheel (6) for displaying information, this display wheel (6) being driven at regular time intervals by a drive finger (4), said drive finger (4) being carried by a drive wheel (2), the drive wheel (2) in turn being driven by a timepiece movement, so as to change the information displayed by the rebound timepiece display mechanism (1) from one value to an immediately following value, the rebound timepiece display mechanism (1) further comprising an intermediate correction device (66), said intermediate correction device (66) allowing an owner of the timepiece to manually correct the information provided by the rebound timepiece display mechanism (1) by acting on a correction finger (72) driving the display wheel (6), the rebound timepiece display mechanism (1) further comprising a safety device (52), said safety device (52) being arranged to allow the information displayed by the rebound timepiece display mechanism (1) to be passed through when it is displayed by the rebound timepiece display mechanism (1) And during a period of time when the drive finger (4) is engaged with the display wheel (6), preventing the correction finger (72) from driving the display wheel (6) while blocking the intermediate correction device (66).

2. The rebound timepiece display mechanism (1) according to claim 1, wherein the display wheel (6) is elastically stressed by a first spring in a direction opposite to the driving of the display wheel (6), this elastic tension being retained by means of a wheel (10) fixedly mounted coaxially with the display wheel (6), and retaining means mounted on the display wheel (6) are elastically pressed into the teeth (12) of the wheel (10).

3. The rebound timepiece display mechanism (1) according to claim 2, wherein the retaining means is a detent lever (16), the detent lever (16) being elastically stressed by a second spring (8) and provided with a beak pressed into the tooth (12) of the wheel (10).

4. The rebound timepiece display mechanism (1) according to claim 2, wherein the retaining means is a retaining finger (14) elastically stressed by a jumper (16) and provided with a beak (13) pressed into the tooth (12) of the wheel (10).

5. Rebound timepiece display mechanism (1) according to any of the claims 1 to 3, characterized in that the driving finger (4) is flexible.

6. Rebound timepiece display mechanism (1) according to claim 5, characterised in that the drive finger (4) comprises a beak (18), the beak (18) engaging with a tooth (50) of the display wheel (6) and being extended by at least one elastic coil (20), the elastic coil (20) terminating in means allowing the fastening of the free end of the elastic coil (20) into the drive wheel (2) carrying the drive finger (4).

7. The rebound timepiece display mechanism (1) according to claim 6, wherein the drive finger holder member comprises a radial arm (22), the radial arm (22) being perforated with a hole (24), the hole (24) allowing the flexible drive finger (4) to be fastened to a pivot shaft (26) of the drive wheel (2) carrying the flexible drive finger (4).

8. The rebound timepiece display mechanism (1) according to any one of claims 6 or 7, wherein a flexible drive finger (4) is coaxially mounted between the drive wheel (2) and a disc (28), the disc (28) being freely mounted on the drive wheel (2) and forming a notch (34) on a periphery (30) of the disc (28); and in that a pin (36) is fixed in the beak (18) of a flexible drive finger (4), said pin (36) protruding at a first end in an elongated hole (38) formed in a plate (40) of the drive wheel (2) and at a second end in the notch (34).

9. The rebound timepiece display mechanism (1) according to claim 7, wherein a flexible drive finger (4) is mounted on the drive wheel (2) pre-stressed such that the pin (36) is always supported against a wall (42) of the elongated hole (38).

10. The rebound timepiece display mechanism (1) according to any one of claims 8 and 9, wherein an eccentric (44) is fixed in the plate (40) of the drive wheel (2) such that a position of the eccentric (44) is adjustable and positioned such that the eccentric (44) terminates in a gap (32) formed in the periphery (30) of the circular disk (28).

11. Rebound timepiece display mechanism (1) according to any of claims 8 to 10, characterized in that a cam (46) integrally mounted on the disc (28) is mounted on top of the disc (28), the contact-shaft (82) of the safety device (52) bearing against the cam (46) making it impossible to attempt any manual correction of the information displayed by the rebound timepiece display mechanism (1) when a flexible driving finger (4) is engaged with the display wheel (6) and the owner of the watch simultaneously actuates the intermediate correction device (66).

12. The rebound timepiece display mechanism (1) according to claim 11, characterized in that the rebound timepiece display mechanism (1) comprises a correction device (54), the correction device (54) actuated by the owner of the watch acting on an intermediate correction device (66) so that a correction finger (72) engages in the tooth (50) of the display wheel (6) and moves the display wheel (6) forward only when the flexible drive finger (4) is not engaged with the display wheel (6).

13. Rebound timepiece display mechanism (1) according to one of the claims 11 and 12, characterized in that the correction means (54) comprises a control lever (56), the control lever (56) pivoting when the owner of the watch pushes on the control lever (56), the control lever (56) being provided with a correction pin (62), the correction pin (62) moving a third spring (64) of the intermediate correction means (66) away from its rest position, the third spring (64) being fixed on a correction lever (68), the correction lever (68) rotating the correction finger (72) by pivoting against the elastic return force of a fourth spring (76) such that the correction finger (72) moves the display wheel (6) forward only when a flexible drive finger (4) is not engaged with the display wheel (6), for which purpose the safety means (52) comprises a pivotally mounted fork (78), the leveling rod (68) is coupled to the fork (78), and the fork (78) is provided with the contact-shaft (82).

14. The rebound timepiece display mechanism (1) according to any one of claims 1 to 13, wherein the drive wheel (2) carrying the flexible drive finger (4) is a 24 hour wheel; and in that said rebound timepiece display mechanism (1) allows displaying said date indication.

15. The rebound timepiece display mechanism (1) according to any one of claims 1 to 12, wherein the drive finger (4) is rigid.

Technical Field

The present invention relates to a display mechanism of a rebound timepiece provided with a safety device. More specifically, the present invention provides a rebound date display mechanism provided with such a safety device.

Background

When the timepiece display mechanism reaches a certain point, it is backed off and returns to its starting point, which is called bouncing. Among the known rebound timepiece display mechanisms, a date display mechanism can be particularly proposed, an example of which is given by a pointer facing an index shift of a date indication on which "1" to "31" appear. The pointer successively points to each of the date indications "1" to "31", and then, when at the end of the month, the pointer reaches the date indication "31", the pointer returns back and returns to facing the date indication "1". Then, the pointer starts shifting from "1" to "31" again facing the date indication.

In most of the rebound timepiece display mechanisms, transmission from one part to the next and to the rebound display member is achieved by means of a rigid member such as a cam or a rack. When the owner of a watch equipped with such a rebounding timepiece display mechanism wants to correct the current time displayed by his watch, the correction can be made only in the direction in which the current time moves forward, but not in the direction in which it moves backward, which is problematic.

In order to meet the demand for a timepiece including a rebound timepiece display mechanism which does not prevent the possibility of correcting the current time displayed by the timepiece in both directions, a rebound timepiece display mechanism has been proposed in which the transmission from one part to the other part and to a rebound display member involves a flexible element such as a flexible finger. The owner of a watch in which such a rebound timepiece display mechanism is integrated is thus provided with the possibility of correcting the current time indication provided by his watch in both directions, that is to say in both the forward and backward directions.

However, the correction of the current time displayed by the watch equipped with the display mechanism of the rebound timepiece is not without problems, whether in only one direction or in both directions. For example, in the presence of a flexible element such as a flexible finger in the kinematic chain of the transmission for the display mechanism of a rebound timepiece, it can be understood that if, at the moment when the flexible finger is engaged with the component which the flexible finger needs to drive in order to ensure the displacement of the rebound display member from one indication to the next in the forward direction, the owner of the watch starts to manually correct the information displayed by the display member, there is a great risk that the owner of the watch will force the flexible element and damage it or even break it, thus stopping the movement of the watch, which is unacceptable. In fact, in this case, the flexible finger will be forced in the direction opposite to that of its driving part, with which it engages to ensure displacement of the rebound display member, and is therefore at risk of plastic deformation or even breakage.

In the case of a display mechanism of a rebound timepiece in which the transmission is realized by means of a rigid member, the problem is of the same extent. In fact, if the owner of the watch attempts to manually correct the indication provided by the display mechanism of the rebound timepiece at the moment when the timepiece movement drives this display mechanism of the rebound timepiece, manual correction is not possible, but nothing is intended to prevent the owner of the watch from forcing the correction mechanism and therefore risking damage to its watch.

Therefore, there is a need in the art for a device that allows to protect a display mechanism of a rebound timepiece from an attempt to correct the display manually when an element located in a kinematic chain for the transmission of the display mechanism of the rebound timepiece is engaged with a component thereof that needs to be driven to ensure the operation of the display mechanism of the rebound timepiece.

Disclosure of Invention

It is an object of the present invention to provide a safety device which allows the owner of a watch to manually correct an indication provided by a display mechanism of a jump-back timepiece and protects the display mechanism of the jump-back timepiece from any attempt to manually correct the information displayed by the display mechanism of the jump-back timepiece during a period of time when a change occurs in the information displayed by the display mechanism of the jump-back timepiece.

To this end, the invention relates to a display mechanism for a rebound timepiece of a watch, comprising a wheel for displaying information, the display wheel is driven at regular intervals by a driving finger carried by a driving wheel which in turn is driven by the timepiece movement, so as to change the information displayed by the display mechanism of the rebound timepiece from one value to the value immediately following, the display mechanism of a rebound timepiece further comprising intermediate correction means allowing an owner of the watch to manually correct information provided by the display mechanism of the rebound timepiece by acting on the correction finger driving the display wheel, the display mechanism of the rebound timepiece further comprising safety means, the safety device is arranged to allow blocking of the intermediate correction device by preventing the correction finger from driving the display wheel during a period of time when a change occurs in the information displayed by the display mechanism of the rebound timepiece and when the drive finger is engaged with the display wheel.

According to a specific embodiment of the invention:

-the drive fingers are rigid;

-the drive fingers are flexible;

the display wheel is elastically stressed by a first spring in a direction opposite to the drive of the display wheel, the elastic tension being retained by means of a wheel fixedly mounted coaxially with the display wheel, and retaining means mounted on the display wheel being elastically pressed into the teeth of the wheel;

the holding means is an elastically stressed detent lever provided with a beak pressed into the teeth of the display wheel;

the holding means are fingers elastically stressed by a positioning rod and provided with beaks pressed into the teeth of the display wheel;

the drive finger comprises a beak engaging with the teeth of the display wheel and extended by at least one elastic coil terminating in means allowing the free end of the elastic coil to be fastened to the drive wheel carrying the drive finger;

the drive finger holder member comprises a radial arm perforated with a hole allowing the flexible drive finger to be fastened to the pivot shaft of the drive wheel carrying the flexible drive finger;

the flexible drive finger is mounted coaxially in rotation between the drive wheel and a disc mounted freely on the drive wheel and forming a recess on the periphery of the disc; and in that the pin is fixed in the beak of the flexible drive finger, the pin protruding at a first end in an elongated hole formed in the plate of the drive wheel and at a second end in a notch;

the flexible drive finger is mounted prestressed on the drive wheel so that the pin is always supported against the wall of the elongated hole;

the eccentric is fixed in the plate of the drive wheel so that the angular position of the eccentric is adjustable and positioned so that the eccentric ends in a gap formed in the periphery of the disc;

a cam integrally mounted on the disc is mounted on top of the disc, the contact-shaft of the safety device resting on the cam making it impossible to attempt any manual correction of the information displayed by the display mechanism of the rebound timepiece when the flexible driving finger is engaged with the display wheel;

-the correction means actuated by the owner of the watch act on the intermediate correction means so that the correction fingers engage in the teeth of the display wheel and move the display wheel forward only when the flexible drive fingers are not engaged with the display wheel;

the correction device comprises a control lever which pivots when the owner of the watch pushes on it, the control lever being provided with a correction pin which moves a third spring of the intermediate correction device away from its rest position, the third spring being fixed on the correction lever which, by pivoting, rotates the correction finger against the elastic return force of a fourth spring, so that the correction finger moves the display wheel forward only when the flexible drive finger is not engaged with the display wheel, for which purpose the safety device comprises a pivotally mounted fork to which the correction lever is coupled and which is provided with a contact-shaft;

the driving wheel carrying the flexible driving fingers may be a 24 hour wheel and the rebound timepiece display mechanism allows the date indication to be displayed.

Thanks to these features, the invention provides a rebound timepiece display mechanism which allows the owner of the watch in which it is embedded to manually correct the indication provided by the rebound timepiece display mechanism without the risk that the owner of the watch can break the rebound timepiece display mechanism. To this end, the present invention aims to provide a display mechanism of a rebound timepiece with a safety device that renders inoperable any attempt by the owner of the timepiece to manually correct the display provided by the display mechanism of the rebound timepiece during a time period when the timepiece movement drives the display mechanism of the rebound timepiece and when the drive finger engages with the display wheel to change the displayed information. Thus, any risk of driving the display wheel in a direction opposite to the direction in which the drive finger drives the display wheel during the period of time when the two components are engaged with each other is eliminated, and thus the risk of breaking the mechanism is eliminated.

Drawings

Other characteristics and advantages of the invention will become clearer from the following detailed description of an embodiment of a display mechanism for a rebound timepiece, given purely by way of illustration and not of limitation in the accompanying drawings, in which:

figure 1 is a top perspective view of a display mechanism of a rebound timepiece according to the present invention;

figure 2A is a top perspective view of the 24-hour wheel in the mounted state;

figure 2B is a top perspective view of the 24-hour wheel of figure 2A in a separated state;

figure 3 is a top view of the assembly formed by the 24-hour wheel and the display wheel shortly before the 24-hour wheel starts to drive the display wheel via its flexible drive fingers;

figure 4 is a top view of the assembly formed by the 24-hour wheel and the display wheel as the flexible drive fingers of the 24-hour wheel start to drive the display wheel;

figure 5 is a top view of the assembly formed by the 24-hour wheel and the display wheel at the moment when the flexible drive finger of the 24-hour wheel has moved the display wheel one step forward and is about to disengage it from the display wheel;

figure 6 is a top view of the assembly formed by the 24-hour wheel and the display wheel at the moment when the flexible drive fingers of the 24-hour wheel have finished moving the display wheel one step forward and out of engagement with the display wheel;

figure 7 is a top perspective view of an intermediate correction device actuatable by the owner of the watch via the correction device to correct the indication provided by the display mechanism of the rebound timepiece according to the invention;

figure 8 is a bottom perspective view of the intermediate correction device shown in figure 7;

figure 9 is a top perspective view of the control rod of the correction device;

figure 10 is a top perspective view of a third spring fixed to the correction rod of the intermediate correction device;

fig. 11 is a top view of a display mechanism of a rebound timepiece according to the invention in the position occupied by the display mechanism of the rebound timepiece when the correcting device is not operated by the owner of the watch;

figure 12 is a top view of the display mechanism of the rebound timepiece according to the invention in the position it occupies when the correction device has just been actuated by the owner of the watch and the correction finger starts to engage with the teeth of the display wheel;

fig. 13 is a top view of the display mechanism of the rebound timepiece according to the invention in the position occupied by the display mechanism of the rebound timepiece when the aligning finger engages with the tooth of the display wheel to align the displayed indication;

figure 14 is a top view of a display mechanism of a rebound timepiece according to the invention in the position it occupies when the owner of the watch releases the pressure on the push-button;

fig. 15 is a top view of the display mechanism of the rebound timepiece according to the invention in the position it occupies when the aligning finger is released from its engagement with the teeth of the display wheel;

fig. 16 is a top view showing the position of the display mechanism of the rebound timepiece according to the invention when the correction is completed;

figure 17 is a top view showing the position of the display mechanism of the rebound timepiece according to the invention when the safety device is activated so as to prevent any manual correction commanded by the owner of the watch when the flexible driving finger is engaged with the display wheel; and

fig. 18 is a view similar to fig. 17, showing a case in which, when the timepiece movement drives the rebound timepiece display mechanism to change the displayed information, the owner of the watch attempts to forcibly correct the information displayed by the rebound timepiece display mechanism according to the present invention, and the manual correction mechanism is thus blocked.

Detailed Description

In the following, it will be noted that the distinction is made between the change in the information displayed by the display mechanism of the rebound timepiece caused by the normal operation of the timepiece movement as time passes and the change in the information displayed by the display mechanism of the rebound timepiece caused by the manual correction by the owner of the watch by means of the manual correction device.

The present invention starts from the following general inventive concept, which consists in: there is provided a display mechanism of a rebound timepiece embedded in a watch and equipped with a safety device which allows to ensure that at any point in time the owner of the watch is not at risk of forcing and breaking the display mechanism of the rebound timepiece by wanting to make a manual correction of the displayed indication. To this end, the invention teaches to provide a display mechanism of a rebound timepiece with a safety device aimed at making it impossible to manually correct the information displayed by the mechanism during a period of time when the display mechanism of the rebound timepiece is driven by a timepiece movement and when the displayed information is automatically changed.

The invention will be described in connection with a rebound timepiece display mechanism providing a date indication. It goes without saying that this example is given for purely illustrative and non-limiting purposes only, and that the invention is applicable to other timepiece display mechanisms arranged to display time information (for example, the week of the week or the month of the year) in a rebound manner.

The display mechanism of a rebound timepiece according to the invention, as shown in fig. 1, indicated as a whole by the general reference numeral 1, comprises a driving wheel 2, the driving wheel 2 carrying a driving finger 4 (see in particular fig. 3). Driven in the counterclockwise direction by the timepiece movement of a watch, not shown in the figures, the driving wheel 2 is also called 24-hour wheel, since it makes a complete revolution in 24 hours. In turn, the drive wheel 2 drives the display wheel 6 in a clockwise direction by means of its drive fingers 4. In a particular and non-limiting case where the display mechanism of the rebound timepiece concerned here is set to display a date indication, the display wheel 6 is moved forward one step per day, and the driving wheel 2 makes a complete one-revolution within 24 hours. However, it will be understood that this example is given for purely illustrative and non-limiting purposes only, and that other indications may be displayed, so that the rotation speed of the driving wheel 2 may be different from 24 hours. For example, if the rebound timepiece display mechanism 1 according to the present invention is used to display a day of the week, the driving wheel 2 will make a complete one-revolution within 7 days. Alternatively, if the display mechanism according to the invention is intended to display months of the year, the drive wheel 2 will complete a full revolution in 31 days.

Furthermore, the display wheel 6 is elastically stressed in the counterclockwise direction (that is, in the direction opposite to its driving) by a first spring (not shown in the drawings). This elastic tension is retained by means of a wheel 10 mounted fixedly coaxially with the display wheel 6, and a positioning rod 16 stressed by a second spring 8 presses the first beak 13 of the retaining finger 14 against the tooth 12 of the wheel 10.

According to a particular embodiment of the invention, not shown in the figures, the retaining means elastically stressing the display wheel 6 may be the jumper 16 itself, which jumper 16 is provided with a beak by means of which the jumper 16 is pressed into the tooth 12 of the display wheel 6.

According to a preferred but non-limiting embodiment of the invention, the drive finger 4 is flexible. By way of non-limiting example, the flexible drive finger 4 comprises a second beak 18 extended by at least one elastic coil 20, the elastic coil 20 terminating with means allowing to fasten the free end of the elastic coil 20 to the drive wheel 2. According to a particular embodiment of the invention, the elastic coil 20 terminates with a radial arm 22 perforated with a hole 24, this hole 24 allowing the insertion of the flexible drive finger 4 on the pivot axis 26 of the drive wheel 2.

As can be seen in particular in fig. 2A and 2B, the flexible drive finger 4 is coaxially rotatably mounted between the drive wheel 2 and the disc 28, forming at least one recess 34 in the periphery 30 of the disc 28, and preferably also a gap 32. The pin 36 is secured by any suitable technique, such as being inserted or glued into the second beak 18 of the flexible drive finger 4. At a first end, the pin 36 projects into an elongated hole 38 formed in a plate 40 of the drive wheel 2; and at a second end, a pin 36 projects into a notch 34 formed in the periphery 30 of the disc 28. The flexible drive finger 4 is mounted on the drive wheel 2 with a slight pre-stress to ensure that the first end of the pin 36 is always supported against the wall 42 of the elongated hole 38 formed in the plate 40 of the drive wheel 2.

The mounting detailed above is done by means of an eccentric 44 fixed in the plate 40 of the driving wheel 2, so that its angular position can be finely adjusted. On the other hand, the disc 28 is mounted freely in rotation with respect to the drive wheel 2 and is positioned so that the eccentric 44 is in the gap 32. Finally, a cam 46 integrally mounted on the disk 28 is mounted atop the disk 28. The function of the cam 46 will be described in detail later.

As described above, the driving wheel 2 makes a complete revolution within 24 hours. In the case where the rebound timepiece display mechanism 1 is intended to display a date indication, a change in the displayed information (that is, date) occurs around midnight. At this time, under the action of the drive wheel 2 pivoting in the counterclockwise direction, the pin 36 abuts against the elongated hole 38, and the flexible drive finger 4 starts to be tightened and the drive disc 28 and the cam 46 pivot (see fig. 4), the flexible drive finger 4 being integrally mounted on the drive wheel 2 at the end opposite to the second beak portion 18 thereof. The flexible drive finger 4 is here assisted by an eccentric 44, which eccentric 44 abuts against an edge 48 of the gap 32. The drive finger 4 drives the display wheel 6 by means of the eccentric 44 and the disc 28. It will be noted that by pivoting the eccentric 44 slightly in one direction or the other, the moment at which the eccentric 44 contacts the disc 28 and the moment at which the displayed indication (here the date indication) changes from one value to the immediately following value are precisely determined.

During this movement, the flexible drive finger 4 moves the display wheel 6 one step forward in the clockwise direction by virtue of its second beak 18 engaging in the tooth 50 of the display wheel 6 (see fig. 5). This pivoting of the display wheel 6, allowed by the retaining finger 14, the retaining finger 14 switching from the space between two of the teeth 12 of the wheel 10 to the immediate space, causes the display to change from one indication to the next, for example one date to the next. Finally, under the action of the drive wheel 2 which continues to rotate, the flexible drive finger 4 is disengaged and relaxed from its engagement with the teeth 50 of the display wheel 6 (see fig. 6).

At this stage of the description, it is important to remember that if the driving finger 4 is intended to be flexible, this is to allow the correction of the current time displayed by the watch in which the rebound timepiece display mechanism 1 according to the invention is embedded, in both directions. However, the invention is equally applicable to the case where the drive finger 4 engaging the teeth 50 of the display wheel 6 is rigid. The only difference from the case in which the drive finger 4 is flexible lies in the fact that when the drive finger 4 is rigid, the current time displayed by the watch in which the rebound timepiece display mechanism 1 according to the invention is embedded can only be corrected in one direction.

It is due to the presence of the driving finger 4 that it is necessary to design a safety device 52, which safety device 52 has the purpose of preventing the manual correction of the indication displayed by the display mechanism 1 of the rebound timepiece, which the owner of the timepiece desires, from being carried out during the period of time when the driving finger 4 is engaged with the display wheel 6. Indeed, at the moment when the flexible driving finger 4 engages with the teeth 50 of the display wheel 6 and produces a change in the displayed information, attempting to correct the indication provided by the rebound timepiece display mechanism 1 according to the invention will cause the display wheel 6 to rotate in the opposite direction to the direction in which the flexible driving finger 4 normally drives the display wheel 6, with the risk that the flexible driving finger 4 will prematurely bend under the effect of repeated deformation. Thus, thanks to the safety device 52 according to the invention, any risk of driving the display wheel 6 in a direction opposite to the direction in which the flexible drive finger 4 drives the display wheel 6 during the period when these two parts are engaged with each other is eliminated, and therefore the risk of breaking the mechanism is eliminated.

The display mechanism 1 of the rebound timepiece according to the present invention is also provided with a correction device 54 to allow the owner of the watch to manually correct the indication displayed by the display mechanism 1 of the rebound timepiece. For this purpose, the correction device 54 comprises a lever 56, by means of which the owner of the watch follows the arrow when he/she is using a button 57AWhen pushed on the lever 56, the lever 56 pivots in a clockwise direction about a first pivot center 58. To increase the pressure on the control lever 56, a bolt 60 is mounted at a first end of the control lever 56, while at a second end the control lever 56 carries a correcting pin 62 (see fig. 9).

When the owner of the watch pushes the lever 56 by means of the bolt 60, the lever 56 pivots about the first pivot centre 58 and, via the correction pin 62, moves the third spring 64 away from its rest position. The third spring 64 belongs to an intermediate correction device 66, the intermediate correction device 66 including a correction lever 68, the third spring 64 being integral with the correction lever 68, and the correction lever 68 being pivotable in the counterclockwise direction about a second pivot center 70 (see fig. 7, 8 and 10). The intermediate correction device 66 also comprises a correction finger 72 which is pivotable about a third pivot centre 74 and is elastically stressed by a fourth spring 76, which fourth spring 76 is preferably, but not in a limiting manner, made in one piece with the correction finger 72. The fourth spring 76 is mounted with a slight elastic prestress by means of a pin 77, which pin 77 moves the fourth spring 76 away from its rest position. The fourth spring 76 elastically stresses the correcting finger 72 in the clockwise direction so as to keep the correcting finger 72 away from the tooth 50 of the display wheel 6 in normal times. In the position of the correction finger 72 remote from the tooth 50 of the display wheel 6, the correction finger 72 bears against the abutment 79.

The operation of the intermediate correction device 66 is as follows: when the owner of the timepiece wants to correct the indication displayed by the rebound timepiece display mechanism 1, he depresses the button 57, which has the effect of rotating the control lever 56 in the clockwise direction (see fig. 11). Under the pivoting action of the control lever 56, the corrector pin 62 moves the third spring 64 away from its rest position and causes the corrector lever 68 to pivot in the counterclockwise direction. By the pivoting, the correction lever 68 pivots the correction finger 72 in the counterclockwise direction against the elastic return force of the fourth spring 76, whereby the correction finger 72 moves the display wheel 6 forward by one step (fig. 12). As can be seen in fig. 13 to 16, when the owner of the watch releases the pressure on the push-button 57, the correction finger 72 is progressively disengaged from the tooth 50 of the display wheel 6.

Finally, the safety device 52 comprises a fork 78, which fork 78 is pivotally mounted about a fourth pivot centre 80 and which is provided with a contact-shaft (feler-spindle) 82. The safety device 52 is coupled to the intermediate orthotic device 66 via a coupling 84 (e.g., a ball-joint coupling). It should be noted that as a particular embodiment of the present invention, the correction lever 68 and the fork 78 may be made in one piece.

According to the invention and as shown in fig. 17, the correction means 54, the intermediate correction means 66 and the safety means 52 together form a link arranged so that the contact-shaft 82 comes to rest against the cam 46 when the flexible drive finger 4 is engaged with the tooth 50 of the display wheel 6 and the owner of the watch simultaneously depresses the push-button 57 in an attempt to correct the indication provided by the display mechanism 1 of the rebound timepiece according to the invention. Thus, the link as a whole is temporarily blocked and the pressure exerted by the watch owner on the control lever 56 remains inactive due to the third spring 64 which stretches to allow additional pivoting of the control lever 56. Indeed, if reference is made to fig. 18, which corresponds to a situation in which the user continues to exert pressure on the push-button 57, it can be seen that the contact-shaft 82 remains in contact with the cam 46, so that the correction lever 68 and the fork 78 also do not move. Thus, continued depression of the push button 57 pivots the control lever 56 in the clockwise direction against the elastic return force of the fifth spring 86, the function of which fifth spring 86 is to elastically stress the control lever 56. By pivoting, the control lever 56 drives the correction pin 62 with it, which correction pin 62 moves out of its contact with the correction lever 68 by being opposed to the elastic return force of the third spring 64. Therefore, even in the case where the owner of the watch attempts to manually correct the display mechanism of the rebound timepiece according to the present invention during the time period when the timepiece movement drives the rebound timepiece display mechanism 1 to change the displayed information, and in the case where the manual correction mechanism including the correction lever 68 and the fork 78 is thus blocked, the manual correction mechanism is protected from any risk of being forced and damaged by the owner.

Thus, when the flexible drive finger 4 disengages from the teeth 50 of the display wheel 6, it suddenly relaxes and pivots the disc 28 and thus the cam 46. The contact-shaft 82 thus loses its support with the cam 46, which releases the link formed by the correction means 54, the intermediate correction means 66 and the safety means 52 and again allows the correction of the indication provided by the rebound timepiece display mechanism 1 by depressing the push-button 57.

It goes without saying that the invention is not limited to the embodiment just described and that a person skilled in the art may envisage numerous modifications and simple variants without departing from the scope of the invention as defined by the appended claims. It will be particularly appreciated that it is not the core for the alignment finger 72 that is resilient and is stressed by the fourth spring 76. This solution is determined only by considerations in the size of the display mechanism 1 of the rebound timepiece, the fact that the correcting finger 72 can be retracted allows a saving in space in practice. However, the alignment fingers 72 may also be rigid, without this impairing the operating principle of the intermediate alignment device 66. Similarly, as already mentioned above, the drive finger 4 may be flexible or rigid, without this affecting the rebound timepiece display mechanism 1 according to the invention. In fact, the significant difference in the case where the drive finger 4 is rigid lies only in the fact that the correction of the current time displayed by the watch in which the rebound timepiece display mechanism 1 is embedded can be made only in one direction. In fact, it will be understood that, when the owner of the watch corrects the current time, this has the effect of rotating the driving wheel 2 so as to avoid any risk of loss of synchronization between the display of the current time and the display of the indication provided by the rebound timepiece display mechanism 1. Thus, when the drive finger 4 is rigid, this means that the drive finger 4 is fixedly mounted on the drive wheel 2 such that the drive wheel cannot rotate against the direction in which the drive wheel rotates when the drive wheel drives the display wheel 6 via the drive finger 4.

Reference numerals

1. Display mechanism of rebound timer

2. Driving wheel

4. Driving finger

6. Display wheel

8. Second spring

10. Wheel

12. Tooth

13. The first beak part

14. Retaining finger

16. Positioning rod

18. Second beak part

20. Elastic coil

22. Radial arm

24. Hole(s)

26. Pivotal shaft

28. Disc with a circular groove

30. Periphery of

32. Gap

34. Notch (S)

36. Pin

38. Elongated hole

40. Board

42. Wall(s)

44. Eccentric part

46. Cam wheel

48. Edge of a container

50. Tooth

52. Safety device

54. Correcting device

56. Control rod

Arrow A

57. Push button

58. First pivot center

60. Bolt

62. Correcting pin

64. Third spring

66. Intermediate correcting device

68. Correcting rod

70. Second pivot center

72. Correcting finger

74. Third pivot center

76. Fourth spring

77. Pin

78. Pivoting fork

79. Support base

80. Fourth pivot center

82. Contact-shaft

84. Ball joint type connector

86. And a fifth spring.