CH337134A

CH337134A - Mechanism for driving and controlling a central seconds hand

Info

Publication number: CH337134A
Authority: CH
Inventors: Cie Vve Jaemes Aubert Et
Original assignee: Cie Vve Jaemes Aubert Et
Priority date: 1958-05-17
Filing date: 1958-05-17
Publication date: 1959-03-15

Description

Mecanisme d'entrainement et de commande dune aiguille de seconde au centre La prAente invention a pour objet un m6canisme d'entrainement et de commande dune aiguille de se- conde au centre. Mechanism for driving and controlling a central seconds hand The subject of the present invention is a mechanism for driving and controlling a central seconds hand.

Celui-ci est caract6ris6 par 1e fait qu'un em- brayage est interpose entre la roue de seconde excen- tr6e et la roue de seconde au centre, elle-meme soli- daire dune came de remise ä zero de la seconde au centre, sur laquelle agit un marteau command6 par la tige de remontoir chaque fois qu'on amene cette derniere en Position de mise ä l'heure et provoque simultan6ment la rupture de 1'entrainement de la roue de centre. This is characterized by the fact that a clutch is interposed between the eccentric seconds wheel and the center seconds wheel, itself integral with a center seconds reset cam, on which a hammer controlled by the winding stem acts each time the latter is brought into the time-setting position and simultaneously causes the center wheel drive to break.

Le dessin annexe reprAente, en plan, une forme d'exkution d'un m6canisme selon Pinvention, don- nee ä titre d'exemple. The appended drawing shows, in plan, one form of execution of a mechanism according to the invention, given by way of example.

En 1 se trouve la roue de seconde, entrainant 1'aiguille de seconde au centre non repr6sent6e par 1'interm6diaire de la roue de seconde au centre 2 de meine diametre, un mobile interm6diaire 3 6tant in- terpos6. La transmission en question est realis6e par une denture fine, comme dans 1e cas d'un chrono- graphe. Le mobile 3 est un mobile d'embrayage, pi- vot6 pour cela sur une bascule en deux pieces 4 tour- nant autour de l'excentrique 5. At 1 is the second wheel, driving the second hand at the center (not shown) through the intermediary of the second wheel at the center 2 of the same diameter, an intermediate mobile 3 being interposed. The transmission in question is carried out by fine toothing, as in the case of a chronograph. Mobile 3 is a clutch mobile, pivoted for this on a two-piece rocker 4 rotating around eccentric 5.

Au voisinage de son extr6mit6 libre, la bascule prend appui sur 1'excentrique de commande 6 sous 1'action du ressort d'embrayage 7, la ramenant dans la Position d'embrayage represent6e et que fixe encore 1'excentrique de but6e B. La vis 9 est une vis de maintien. Quant ä 1'excentrique de commande 6, il est solidaire d'un levier de commande 10, pivot6 en 11 et se terminant, ä l'oppos6 de ce point par une Partie coud6e 12. elle-meme engag6e dans la rainure circulaire de la tige de remontoir 13. Il est clair qu'en tirant cette tige en Position de mise ä Pheure, an fers tourner 1e levier de commande 10 dans 1e sens antihoraire par rapport au dessin, en meine temps que la bascule 4 sera entram6e dans 1e meine sens, retirant 1e mobile 3 en Position d6brayee. Near its free end, the rocker rests on the control eccentric 6 under the action of the clutch spring 7, bringing it back into the clutch position shown and which is still fixed by the stop eccentric B. screw 9 is a holding screw. As for the control eccentric 6, it is integral with a control lever 10, pivoted at 11 and ending, opposite this point, in a bent part 12, itself engaged in the circular groove of the winding stem 13. It is clear that by pulling this stem into the time-setting position, with irons turn the first control lever 10 in the first counterclockwise direction with respect to the drawing, at the same time that the rocker 4 will be engaged in the first direction, removing the mobile 3 in the disengaged position.

Le levier de commande 10 agit 6galement sur 1e marteau 14 pivote en 15 et destin6 ä actionner la came 16 de remise ä z6ro de la seconde au centre. La Partie coud6e 12 du levier 10 engagde dans la rai- nure circulaire de la tige 13 penetre en effet en meine temps dans une entrde rectangulaire du marteau 14 et provoque ainsi la descente de ce dernier sur la came 16 par tirage de la tige 13. De ce fait, 1e Passage de la tige de remontoir 13 en Position de mise ä 1'heure n'a pas seulement pour effet de rompre 1'en- trainement de la seconde au centre, mais encore de la ramener ä zero, c'est-ä-dire normalement sur la Position de midi. The control lever 10 also acts on the hammer 14 pivoted at 15 and intended to actuate the cam 16 for resetting the second to the center. The bent part 12 of the lever 10 engaged in the circular groove of the rod 13 in fact penetrates at the same time into a rectangular entry of the hammer 14 and thus causes the latter to descend on the cam 16 by pulling the rod 13. As a result, the passage of the winding stem 13 into the time-setting position not only has the effect of breaking the driving of the central seconds hand, but also of bringing it back to zero, it i.e. normally at the 12 o'clock position.

L'utilite de cette disposition est de pouvoir proc6der par exemple ä une mise ä 1'heure avec remise simultanee ä zero de la seconde au centre, qui se re- mettra en marche des que 1'on repoussera la tige de remontoir en Position de remontage, c'est-ä-dire dans sa Position normale de repos. Et meine saus proceder ä une mise ä Pheure, il est en tout temps possible, en retirant la tige de remontoir, de remettre ä vo- lonte la seconde au centre ä z6ro. The usefulness of this arrangement is to be able to set the time, for example, with simultaneous resetting of the central second to zero, which will start again as soon as the winding stem is pushed back into the starting position. reassembly, that is to say in its normal resting position. And even without setting the time, it is possible at any time, by removing the winding stem, to reset the center seconds to zero at will.

La bascule de debrayage 4 se continue jusqu'au voisinage dune goupille 17, fix6e sur 1e cliquet de masse 18. The clutch rocker 4 continues up to the vicinity of a pin 17, fixed on the first mass pawl 18.

Lors du remontage et au Passage de chaque dent du rochet de barillet 19 dans 1e sens de la fleche, 1e chquet tourne en sens inverse et sa goupille 18 d6- During winding and when each tooth of the barrel ratchet 19 passes in the 1st direction of the arrow, the 1st check rotates in the opposite direction and its pin 18 d6-

place la bascule 4 dans 1e sens du debrayage de la seconde au centre. places rocker 4 in the first direction of disengaging the second in the centre.

0n dispose ainsi d'un moyen, apres avoir ramene la seconde au centre ä zero et 1'avoir remise en mar- che, de 1'arreter dans une Position quelconque en ope- rant un debut de remontage, correspondant ä une rotation d'environ un huitieme de tour de la cou- ronne de remontage. La disposition adoptee permet ainsi de se servir egalement de la pike comme chro- nographe. We thus have a means, after having brought the seconds hand back to the center at zero and having restarted it, of stopping it in any position by operating a start of winding, corresponding to a rotation of approximately one-eighth of a turn of the winding crown. The arrangement adopted thus makes it possible to also use the pike as a chronograph.

Par 1'effet du Profil circulaire de la Partie de la bascule 4 prenant appui sur la goupille 17 et de sa Position, an voit qu'il se produira, ä chaque remon- tage, un soulevement rapide de la bascule, puis une immobilisation pratiquement parfaite de cette der- niere, malgre 1e sautillement du cliquet sur les dents du rochet. L'aiguille de seconde s'arrete ainsi durant tout 1e remontage. By the effect of the circular profile of the Part of the rocker 4 resting on the pin 17 and its position, one sees that there will be, at each reassembly, a rapid lifting of the rocker, then an immobilization practically perfect of the latter, in spite of the hopping of the pawl on the teeth of the ratchet. The seconds hand thus stops throughout the entire winding.

0n pourrait enfin, en adoptant pour 1'entraine- ment de la seconde au centre un rapport tel quelle effectue un tour de cadran en trois minutes, utiliser Je mecanisme dkrit comme compteur de telephone. Finally, by adopting a ratio for driving the central seconds hand such that it completes one turn of the dial in three minutes, we could use the mechanism described as a telephone counter.

Claims

CLAIM Mechanism for driving and controlling a second hand in the center, characterized by the fact that a clutch is interposed between the off-centered second wheel and the central second wheel, itself integral with a reset cam. zero of the second in the centre, on which a hammer controlled by the winding stem acts each time the latter is brought into the time-setting position and simultaneously causes the center wheel drive to break. SUB-CLAIMS 1. Mechanism according to claim, characterized in that the second wheel in the center is driven by a mobile clutch carried by a rocker actuated by a member driven in turn by the winding stem.

2. Mechanism according to claim and sub-claim 1, characterized in that the member driven by the winding stem actuates the hammer for resetting the second to zero at the center, and this at the same time as the rocker in causes the clutch to disengage.

3. Mechanism according to claim and sub-claim 1, characterized in that the mass pawl pushes the rocker into the disengaged position of the first start of the winding function.