CH711563A2

CH711563A2 - Mechanism for positioning a toothed wheel in a watch movement.

Info

Publication number: CH711563A2
Application number: CH01384/15A
Authority: CH
Inventors: Orny Franck; Girardin Johnny
Original assignee: Winston Harry Sa
Priority date: 2015-09-24
Filing date: 2015-09-24
Publication date: 2017-03-31

Abstract

The invention relates to a mechanism for positioning a toothed wheel (1) mounted on a shaft (2) rotatable in a clockwise movement, said positioning mechanism comprising a positioning lever (3) having a lateral edge 4) arranged to cooperate with at least one plate (6) provided on the axis (2) of the toothed wheel (1). The positioning lever (3) comprises a pivot arm (8) arranged to be pivotally mounted about a pivot axis (10) provided in the clockwork movement, a positioning element (14) having the lateral edge (4) (8), and means for adjusting and locking the position of the positioning element (14) on the pivot arm (8) with respect to the axis (2) Of the toothed wheel (1).

Description

Field of the Invention [0001] The invention relates to the field of mechanical horology. More particularly, it relates to a mechanism for positioning a toothed wheel mounted on an axis that can be rotated in a clockwise movement, said positioning mechanism comprising a positioning lever having a flat lateral edge arranged to cooperate with a plate provided on the wheel Axis of the gearwheel. The present invention also relates to a watch movement comprising such a positioning mechanism.

BACKGROUND OF THE INVENTION [0002] Such a positioning mechanism is for example described in the application WO 2014/076 262. This prior document is incorporated by reference. This mechanism comprises a positioning lever 101 having a flat lateral edge arranged to cooperate with a plate 97 provided on the sprocket pin 96, 98, 100 and is used for perfectly pivoting and repositioning the sprockets 96, 98, 100 when the Cycle of the information carrier is completed.

[0003] However, this mechanism does not allow fine adjustment of the positioning lever, which is often required in the field of horology. In particular, such a mechanism does not make it possible to guarantee an initial positioning or a correct repositioning of a toothing intended to cooperate with another toothing periodically. Therefore, the risk of meshing faults when starting or restarting the toothed wheel after a momentary stoppage are important. SUMMARY OF THE INVENTION [0004] A particular object of the invention is to overcome the disadvantages of the known mechanism.

[0005] Plus précisément, un objectif de l’invention est de fournir un mécanisme de positionnement d’une roue dentée destinée à coopérer avec une autre roue dentée par périodes, ledit mécanisme de positionnement permettant un réglage fin du levier de positionnement afin de garantir un positionnement initial correct de la roue dentée ou son repositionnement, pour assurer un engrènement sans défaut entre lesdites roues dentées, en particulier après un arrêt momentané de la roue dentée.

[0006] A cet effet, la présente invention concerne un mécanisme de positionnement d’une roue dentée montée sur un axe mobile en rotation dans un mouvement horloger, ledit mécanisme de positionnement comprenant un levier de positionnement présentant un bord latéral plat agencé pour coopérer avec au moins un plat prévu sur l’axe de la roue dentée.

According to the invention, the positioning lever comprises a pivoting arm arranged to be pivotably mounted about a pivot axis provided in the watch movement, a positioning element having the flat lateral edge and mounted articulated on the arm And means for adjusting and locking the position of the positioning element on the pivot arm with respect to the axis of the toothed wheel.

The present invention also relates to a watch movement comprising a toothed wheel mounted on a rotatable shaft and comprising a positioning mechanism as defined above.

The positioning mechanism according to the invention makes it possible to ensure a very fine adjustment of the positioning lever in order to guarantee correct positioning or repositioning of said toothed wheel, in particular after a momentary stoppage of said toothed wheel.

BRIEF DESCRIPTION OF THE DRAWINGS Other characteristics and advantages of the invention will appear more clearly on reading the following description of a particular embodiment of the invention, given by way of a simple illustrative and non-limiting example, And the appended figures, of which: FIG. 1 shows a plan view of a positioning mechanism according to the invention, FIG. 2 is an isometric view from below of the mechanism of FIG. 1, Figs. 3 and 4 are views from above of the positioning mechanism according to the invention in two different adjustment positions, FIG. 5 is a plan view of the positioning mechanism according to the invention, the gearwheel being in an operating position, and FIG. 6 is a plan view of the positioning mechanism according to the invention,

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT In the present description, the term "gear" is to be interpreted in the broad sense and designates any circular element comprising at least one toothed sector, such as a disc, a wheel , A crown, a pinion etc.

[0012] With reference to FIGS. 1 and 2, there is shown a mechanism for positioning a toothed wheel 1 mounted on a shaft 2 rotatably movable in a clockwise movement. The toothed wheel 1 is arranged to cooperate with another toothing of a clockwork mechanism (not shown), in particular per period or per cycle, the toothed wheel 1 being immobilized at the end of the period or the cycle in its position Or any other position provided for by the mechanism. In particular, the toothed wheel 1 corresponds, for example, to the reversing gearwheels 96-98 and 100 described in application WO 2014/176 262 and intended to rotate the arm actuating wheel in the clockwise and counter-clockwise direction during its duty cycle. shifting. When the arm has carried out a displacement cycle, The reversing gears must definitely return to their initial position in order to be able to mesh again without faults with the different gear teeth of the mechanism during the following cycle. In the rest of the description, the toothed wheel 1 corresponds to the reversing gearwheels 96-98 or 100 or any other gearwheel of a watch mechanism requiring more particularly a very precise repositioning of the teeth when the gearwheel stops after pivoting d At a given angle.

In order to ensure correct positioning of the toothed wheel 1 after it has stopped, a positioning lever 3 is provided having a flat lateral edge 4 arranged to cooperate with a plate 6 provided on the axis 2 of the toothed wheel 4 The plate 6 is made on the axis 2 so as to be positioned opposite the lateral edge 4 of the positioning lever 3 when the toothed wheel 1 stops after having pivoted by the determined angle.

According to the invention, the positioning lever 3 comprises a pivoting arm 8 arranged to be mounted to pivot about a pivot axis 10 provided in the watch movement. To this end, the pivoting arm has at one end a ring 12 pivotally mounted on the pivot pin 10. At its other end, its free end, the pivoting arm 8 carries a positioning element 14 which has The flat lateral edge 4. More precisely, the positioning element 14 is mounted superimposed on the pivoting arm 8 so as to present an outer end 14a having the flat lateral edge 4 facing the axis 2 of the toothed wheel 1 And an inner end 14b facing the pivot axis 10 of the pivoting arm 8.

Referring more specifically to FIGS. 3 to 6, the positioning element 14 comprises, between its outer end 14a and its inner end 14b, a first oblong opening 18 disposed longitudinally with respect to the pivoting arm 8 and a second oblong opening 20 disposed transversely to the arm of Pivoting 8. The first and second oblong openings 18, 20 are connected by a channel 23. The first opening 18 is arranged to cooperate with the means for adjusting the position of the positioning element 14 and the second opening 20 is arranged to Cooperate with the means for locking the position of the positioning element 14.

Advantageously, the means for adjusting the position of the positioning element 14 on the pivoting arm 8 with respect to the axis 2 of the toothed wheel 1 comprise an eccentric 22 mounted on the pivoting arm 8 and arranged To cooperate with the positioning element 14. More particularly, the eccentric 22 is mounted on the pivoting arm 8 by fitting in the first oblong opening 18 so as to be able to cooperate with the edges of the said oblong opening 18 in order to pivot The positioning element 14 around the pivot 16 during the adjustment.

Preferably, the means for locking the position of the positioning element 14 on the pivoting arm 8 with respect to the axis 2 of the toothed wheel 1 comprise a clamping screw 24 mounted on the pivoting arm 8 and arranged to lock the positioning member 14 on said pivot arm 8. More particularly, the clamping screw 24 is mounted on the pivot arm 8 through the pivot arm 8. Second elongated opening 20 of the positioning member 14. Thus, the positioning member 14 may move around the clamping screw 24 when it is pivoted for adjustment.

[0018] A holding spring 26 of the pivot arm is also provided. As shown in FIG. 2, the holding spring 26 is mounted on the pivot pin 10 and is hooked onto the eccentric 22 mounted on the pivot arm 8.

Operation of the positioning mechanism according to the invention is as follows: at the time of assembly of the mechanism, the positioning element 14 is positioned so that its flat lateral edge 4 is aligned with the plate 6 provided on the device, Axis 2 of the toothed wheel 1 which is opposite the positioning element 14 when the toothed wheel 1 is in a position corresponding to its position stopped after having pivoted by the determined angle. The positioning element 14 presses on the plate 6 in order to correctly reposition the toothed wheel 1 so that its teeth can mesh without fault with the mechanism associated with the next restart of the toothed wheel 1.

In order that the effect of the positioning lever 3 on the plate 6 is as efficient as possible, it is necessary for the flat side edge 4 to be perfectly aligned with the plate 6. The position of the positioning lever 3 must therefore be Very finely tuned. For this purpose the positioning element 14 is pivoted about the pivot 16 by means of the eccentric 22 cooperating with the edges of the first oblong opening 18 so as to modify more or less the angular position a of the positioning element 14 with respect to the positioning arm 8, as shown in FIGS. 3 and 4. The second oblong aperture 20 permits the movement of the positioning element 14 while leaving the screw of

Claims

Mounted on the pivot arm. Once the angular position a of the positioning element 14 is set so that the flat side edge 4 is perfectly aligned with the plate 6, the positioning element 14 is fixed to the pivoting arm 8 by means of the clamping screw 24. [0021] With reference to FIG. 5, during the operation of the mechanism, the positioning lever 3 is lifted by the rounded face of the axis 2 of the toothed wheel 1. When the toothed wheel 1 is pivoted by the determined angle relative to the position of the plate 6 , The plate 6 comes into register with the pivoting lever 3 which is lowered, brought back by its holding spring 26. When the toothed wheel 1 stops, the flat lateral edge 4 of the pivoting element 14 then presses against the Plate 6 of the spindle 2 to reposition the teeth of the toothed wheel 1, as shown in FIG. 6. The alignment of the lateral edge 4 of the pivoting element 14 with the plate 6 of the axis 2 obtained by the very fine adjustment of the pivoting element 14 allows the exact repositioning of the toothed wheel 1 so that its toothing can To engage without fault with the mechanism associated with the next restart. claims

1. A mechanism for positioning a toothed wheel mounted on a shaft rotatably movable in a clockwise movement, said positioning mechanism comprising a positioning lever having a flat lateral edge arranged for Cooperating with at least one plate (6) provided on the spindle (2) of the toothed wheel (1), characterized in that the positioning lever (3) comprises a pivot arm (8) Of a pivot pin (10) provided in the watch movement, a positioning element (14) having the flat lateral edge (4) and mounted pivotably on the pivot arm (8), and adjustment and locking means Of the position of the positioning element (14) on the pivot arm (8) with respect to the axis (2) of the toothed wheel (1).

2. Mechanism according to claim 1, characterized in that the positioning element (14) is mounted superimposed on the pivoting arm (8) in such a way as to have an outer end (14a) having the lateral edge (4) flat in (2) of the toothed wheel (1) and an inner end (14b) facing the pivot axis (10) of the pivot arm (8).

3. Mechanism according to claim 2, characterized in that the positioning element (14) is articulated on the pivoting arm (8) by its outer end (14a) by means of a pivot (16) provided on said pivot arm (8).

4. The mechanism as claimed in claim 1, wherein the means for adjusting the position of the positioning element on the pivoting arm relative to the axis of the positioning element, (1) comprise an eccentric (22) mounted on the pivot arm (8) and arranged to cooperate with the positioning element (14).

5. The mechanism as claimed in claim 1, wherein the means for locking the position of the positioning element on the pivoting arm with respect to the axis of the element, (1) comprises a clamping screw (24) mounted on the pivot arm (8) and arranged to lock the positioning element (14) on the pivot arm (8).

6. The mechanism as claimed in claim 1, wherein the positioning element comprises a first oblong opening designed to cooperate with the positioning means of the positioning element. ) And a second oblong opening (20) arranged to cooperate with the locking means for locating the positioning element (14).

7. Mechanism according to claim 1, characterized in that it comprises a holding spring (26) for the pivoting arm (8).

8. A watch movement comprising a gearwheel (1) mounted on a rotatable shaft (2) comprising a positioning mechanism according to one of the preceding claims.