CH708338B1 - Step-by-step corrective mechanism. - Google Patents

Abstract

The invention relates to a corrective step-by-step mechanism (1) for a timepiece, the timepiece comprising a toothed mobile (2) positioned by a jumper (3), the corrector mechanism (1) comprising a rocker (6). Said rocker (6) comprises a pawl (7) arranged to penetrate into the toothing of the toothed mobile (2) and to interact with said toothing in order to drive the toothed mobile (2) in rotation in steps. The rocker (6) also comprises at least one guide means (13; 16, 17) in translation and in rotation. According to the invention, the corrective mechanism further comprises a mobile (11) arranged to be driven by a rotary correction member (19) of the timepiece and on which the rocker (6) is arranged to be eccentrically pivoted.

Description

Description TECHNICAL FIELD [0001] The present invention relates to the field of watchmaking. It relates more particularly to a corrective step-by-step mechanism for the manual correction of a toothed mobile. Such mobiles can be found among others in the calendar mechanisms.

STATE OF THE ART [0002] US Pat. No. 3,762,156 discloses a corrective step-by-step mechanism for correcting a ratchet wheel, typically linked to a display. The correction mechanism comprises a rocker guided by two pins and actuated by a lever of the time setting mechanism to advance or delay a second hand. Document EP 1 115 041 discloses another corrective step-by-step mechanism for correcting a ratchet wheel. This correction mechanism comprises a rocker pivoted on an axis and actuated by a cam, the cam being rotated from the winding stem to correct a date indication.

Although interesting, this kind of device is poorly adapted to operate a toothed mobile remote from the winding stem, especially because of the geometries and kinematics of the latches and the respective drive means of the latches, which require a some proximity between the toothed mobile and the winding stem. Therefore, the toothed mobile can not be positioned freely in the movement.

The present invention aims to overcome, at least partially, the aforementioned drawbacks. Disclosure of the invention [0005] More specifically, the invention relates to a step-by-step correction mechanism for a timepiece, the timepiece comprising a toothed mobile positioned by a jumper. The corrective mechanism comprises a rocker provided with a pawl arranged to penetrate into the toothing of the toothed mobile and to interact with the toothing in order to drive the toothed mobile in rotation in steps. The rocker comprises at least one translational and rotational guiding means.

According to the invention, the corrector mechanism further comprises a mobile arranged to be driven by a rotary correction member, for example a time-setting rod, that includes the timepiece to which the corrector mechanism is associated, and on which the rocker is arranged to be pivoted eccentrically. Thus is proposed a correction mechanism having a kinematic that allows to place the toothed mobile anywhere in the movement, without the need to guide and / or support the rocker on the movement in several places.

Preferably, the corrective mechanism is arranged such that the pawl is spaced from the toothing of the toothed mobile in at least one position of the rocker. Consequently, collisions and energy losses associated with interactions between the pawl and the toothed mobile during normal operation, that is to say when the corrective mechanism is not in use, are avoided.

Preferably, said at least one guiding means is arranged on the rocker to cooperate with a pin or a stud integral with the base movement of the timepiece. In a variant, the rocker comprises two guiding surfaces arranged substantially parallel to each other and arranged to cooperate with said pin or said stud, which has the advantage of limiting the number of parts in the mechanism. In another variant, the rocker comprises a single guiding surface arranged to cooperate with said pin or said pad, an elastic element of the corrective mechanism being arranged to support said guiding surface against said pin or said pad, which makes it possible to obtain a simple toggle to manufacture.

Preferably, the rocker is pivoted on a post extending substantially perpendicularly to the plane of a mobile intended to be actuated by a time setting mechanism that includes the timepiece, the plane of said mobile is preferably parallel to the plane of the movement. As a result, the movements of the rocker are compact and efficient.

Preferably, the pawl is pivoted on the rocker and is subjected to a restoring force tending to maintain it in the rest position against a stop, this stop being preferably a pin integral with the rocker. The pawl can therefore be lifted by a tooth of the toothed gear with a limited loss of energy.

Preferably, the toothed mobile is provided with thirty-one teeth and is preferably a date star.

The invention further relates to a timepiece comprising a corrective mechanism and / or a date mechanism as defined above.

BRIEF DESCRIPTION OF THE DRAWINGS [0013] Other details of the invention will appear more clearly on reading the description which follows, made with reference to the appended drawings in which:

Fig. 1 is a plan view of a first embodiment in its rest position; fig. 2 is a plan view of a first embodiment in a first state during operation; fig. 3 is a plan view of a first embodiment in a second state during operation; fig. 4 is a plan view of a second embodiment in its rest position; fig. 5 is a plan view of a second embodiment in a first state during operation; fig. 6 is a plan view of a second embodiment in a second state during operation.

Embodiment of the Invention [0014] FIGS. 1 to 3 illustrate a corrective mechanism 1 according to a first embodiment of the invention. The corrective mechanism 1 is arranged to actuate by pitch a toothed mobile 2 of the base movement to which the corrective mechanism 1 is associated. The toothed mobile 2 is positioned by a jumper 3 comprising, in a known manner, a jumper 4 subjected to a restoring force exerted by a jumper spring 5, the jumper 4 penetrating between two consecutive teeth of the teeth of the mobile 2. Other forms of jumper are well known to those skilled in the art, who could apply them according to his needs, without having to describe them.

The toothed mobile 2, as shown in the figures, is a date star with 31 teeth. Alternatively, the toothed mobile 2 could be a mobile of the days of the week having seven teeth, a mobile of seconds or minutes having sixty teeth, a mobile of weeks having fifty-two teeth, or any other mobile associated with an indication. a unit of time.

The corrector mechanism 1 further comprises a rocker 6 provided at one end of a pawl 7 arranged to penetrate into the toothing of the toothed mobile 2 and to rotate it in steps. The pawl 7 is pivotally mounted on the rocker 6 and is subjected to a restoring force by a pawl spring 8 mounted on the rocker 6, which tends to maintain a bearing portion 9 of the pawl 7 against a pin 10 integral with the rocker 6. Therefore, the pawl 7 can be lifted by a tooth of the toothed gear 2 moving in the clockwise direction, if the pawl 7 is in the toothing of the toothed gear 2 when the gear 2 rotates.

At the other end of the rocker 6, it is pivoted eccentrically on a mobile 11 driven by a time setting mechanism 12. As illustrated in the figures, the rocker 6 is pivoted on a tenon 20 projecting from the mobile 11, extending perpendicularly to the plane of the mobile 11. Other eccentric pivoting arrangements of the latch 6 on the mobile 11 are naturally possible.

In the embodiment of FIGS. 1 to 3, the rocker 6 is further guided by a guide means comprising a guide surface 13, which slides on a support integral with the frame of the base movement, here represented by a pin or a stud 14. To maintain the surface 13 against the stud 14, a spring 15 is provided to support the rocker 6 against the stud 14.

Thanks to the arrangement of the guide means and the pivoting of the rocker on the mobile 11, the pawl 7 is arranged to perform the necessary movements to advance the toothed gear 2 by step, while the watchmaker takes advantage of a freedom of choice of the location of the toothed mobile 2 improved over the prior art. In addition, because the rocker 6 is supported at two points, one being relatively close to the toothed mobile 2, the other being relatively close to the time setting mechanism, the corrector mechanism 1 takes up little space on the motion it is associated with, leaving more room for other components of the movement.

Figs. 4 to 6 illustrate a second embodiment of the corrector mechanism 1 according to the invention, which differs from the first embodiment shown in FIGS. 1 to 3 in that the rocker 2 comprises two guide surfaces 16, 17, arranged on either side of the pad 14 and substantially parallel to each other. The first guide surface 16 is arranged similarly to the guide surface 13 of FIGS. 1 to 3, and the second guide surface 17 is arranged on a projecting portion 18 of the rocker 2. Therefore, the guide of the rocker 2 is provided by these two guide surfaces 16, 17 interacting with the stud 14, and the spring 15 (see Figures 1 to 3) is no longer necessary.

The operating sequence will now be described with reference to FIGS. 1 to 3 and 4 to 6 respectively.

Figs. 1 and 4 illustrate the corrector mechanism 1 in its rest position. The pawl 7 is spaced from the toothing of the toothed gear 2, and the jumper 3 keeps the toothed gear 2 in position. In this state, the toothed wheel 2 therefore does not interact with the corrective mechanism 1, and is free to be driven, in known manner, by the basic movement by any mechanism.

If the user wants to correct or modify the display associated with the toothed mobile 2, it puts the time setting rod 19 in its appropriate axial position, thus kinematically connecting the mobile 11 to the rod of bet at time 19. By turning the time setting rod 19, the user thus puts the mobile 11 in rotation in the clockwise direction.

Claims (9)

The pawl 7 is moved so that it enters the toothing of the toothed gear 2, and then is moved towards the right in the figures (that is to say substantially parallel to the guide surface 13, 16 and / or 17, where appropriate), the rocker 6 rotating around its point of contact on the stud 14, and sliding on the stud 14. The pawl 7 bears against a tooth of the toothed gear 2, thus driving the toothed gear 2 in the clockwise direction, and thus raising the jumper 3 against its jumper spring 5 until the spout 4 of the jumper 3 reaches the top of a tooth of the toothed gear 2, as shown in FIGS. 2 and 5. As shown in FIGS. 3 and 6, an additional rotation of the time setting rod 19 causes a slight further movement of the rocker 6 to the right. The top of the tooth of the toothed gear 2 thus escapes the spout 4 of the jumper 3, which makes the toothed wheel 2 rotate in the clockwise direction by sliding between the side of the tooth and the side of the spout 4 of the jumper 3 under the effect of jumper spring 5 to position it in its next stable position, as is generally known. It should be noted that, if the basic movement actuates the toothed mobile 2 while the pawl 7 is penetrating into the toothing of the toothed gear 2, or if the top of the upstream tooth catches the pawl 7 when driving the toothed wheel 2 by the pawl, the top of the upstream tooth raises the pawl 7 against the pawl spring 8, thus allowing the upstream tooth to pass. Subsequently, the user can return the flip-flop 6 to its initial position. Indeed, the top of the pawl 7 follows a more or less ellipsoidal path, which enters the toothing of the toothed mobile 2 for at least part of its path. It can not be ruled out that, alternatively, the top of the pawl 7 still remains penetrating into said toothing. claims 1. Step-by-step corrective mechanism (1) for a timepiece, the timepiece comprising a toothed mobile (2) positioned by a jumper (3), the corrector mechanism (1) comprising a rocker (6) , said rocker (6) comprising a pawl (7) arranged to penetrate into the toothing of the toothed wheel (2) and to interact with said toothing in order to drive the toothed wheel (2) in rotation in steps, said rocker (6) having at least one guide means (13; 16, 17) in translation and in rotation; characterized in that the correction mechanism further comprises a mobile (11) arranged to be driven by a rotary correction member (19) of the timepiece and on which the rocker (6) is arranged to be pivoted eccentrically. 2. Correction mechanism (1) according to the preceding claim, characterized in that it is arranged such that the pawl (7) is spaced from the toothing of the toothed gear (2) in at least one position of the rocker (6 ). 3. corrector mechanism (1) according to one of the preceding claims, characterized in that said at least one guide means (13; 16, 17) is arranged on the rocker (6) to cooperate with a pin or a stud ( 14) integral with a basic movement of the timepiece. 4. corrector mechanism (1) according to the preceding claim, characterized in that said at least one guide means comprises two guide surfaces (16,17) arranged substantially parallel to each other and arranged to cooperate with said pin or said stud ( 14). 5. corrector mechanism (1) according to claim 3, characterized in that said at least one guide means comprises a single guide surface (13) arranged to cooperate with said pin or said stud (14), and in that it comprises an elastic element (15) arranged to support said guide surface (13) against said pin or said stud (14). 6. corrector mechanism (1) according to one of the preceding claims, wherein the rocker (6) is pivoted on a pin (20) extending substantially perpendicular to the plane of said mobile (11), intended to be actuated by a mechanism setting time (12), said mobile (11) being preferably parallel to the plane of movement. 7. corrector mechanism (1) according to one of the preceding claims, wherein the pawl (7) is pivoted on the rocker (6) and is subjected to a restoring force tending to maintain it in the rest position against a stop ( 10), integral with the rocker (6). 8. Date mechanism comprising a corrector mechanism (1) according to one of the preceding claims, wherein said toothed mobile (2) is provided with thirty-one teeth and is preferably a date star. 9. Timepiece comprising a corrector mechanism (1) according to one of claims 1 to 7, and / or a date mechanism according to claim 8.