Eta Sa Manufacture Horlogere Suisse

Julien Chaignat

Marco Bettelini

Stefan Rombach

The annual calendar device carries a date ring () and a drive wheel () for said ring. The drive wheel () carries a mechanism () including a first finger () driving the ring () through one step each day and a second finger () which is inserted, at the end of the months of less than thirty-one days, into the trajectory of the teeth () of the ring () to move said ring forward one additional step. The second finger () is inserted into said trajectory by a kinematic chain () controlled by a toothing () carried by the ring ().

Annual calendar device for a timepiece

Device that assists in maintaining the position of a date indicator disc () for a timepiece, the position of the date indicator disc () being indexed by a jumper spring ('), said device being characterized in that it includes a locking member (&#x2032;) which, outside the date indication correction phases, keeps the jumper spring (&#x2032;) locked, said locking member (&#x2032;) moving away in the date indication correction phase to release the jumper spring ().

Device that assists in maintaining the position of a date indicator disc for a timepiece

A correction device for a timepiece display mechanism, which includes a display member fitted with a toothing of pitch P, includes a pinion provided with a toothing of pitch p, mounted on a winding stem so as to occupy at least one display correcting position A, and a correction wheel mounted between the pinion and the display member. The correction wheel includes a first toothing defined by pitch P, a head diameter D, and a foot diameter d, formed of teeth including a tip extending substantially angularly, and the tip is cut so as to form a second discontinuous toothing that is coplanar and concentric to the first toothing, defined by pitch p less than the pitch P of the first toothing, a head diameter D equal to the head diameter of the first toothing, and a foot diameter dgreater than the foot diameter dof the first toothing.

Correction device for timepiece display mechanism and wheel fitted thereto

Date mechanism () for a timepiece, including:

Date mechanism for a timepiece

A single direction coupling device, including a first transmission member () fitted with a first saw-like contrate toothing (), mobile in rotation about an axis XX and axially positioned by an elastic member (), and a second transmission member () fitted with a second saw-like toothing (), mobile in rotation about an axis YY, meshed with the first transmission member (), characterized in that the XX axis is perpendicular to the YY axis.

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Le Landeron, Switzerland

Julien Chaignat