Eta Sa Manufacture Horlogere Suisse

Christian Ruefenacht

Raphael Courvoisier

Giuseppe Cappadona

Antonio Merino

Jean-Luc Helfer

A timepiece including at least analogue time display device, and an AM-PM display device for displaying day-night information in the dial of the timepiece. The AM-PM display device includes at least two apertures made in the dial of the watch, a rotating display disc bearing at least one first series of inscriptions corresponding to the day and at least one second series of inscriptions corresponding to the night, these two display series being disposed on at least two concentric circles, and a drive mechanism arranged so as to automatically and alternately bring the first series of inscriptions inside a first aperture and the second series of inscriptions inside a second aperture by rotating the display disc.

Timepiece comprising AM-PM indicating means

A display mechanism including a mechanism for fast correction of a position of a display wheel set, an intermediate wheel set ensuring synchronization with an automatic drive mechanism, and, inserted between the intermediate wheel set and the display wheel set, a safety lever driven by the display wheel set during periodic driving thereof, in a trajectory that interferes with a spatial volume of the intermediate wheel set, such that, when the intermediate wheel set is correctly synchronized, the trajectory of the lever does not interfere with the intermediate wheel set, and, when the intermediate wheel set is not correctly synchronized, the trajectory of the safety lever interferes with the intermediate wheel set, which the safety lever then drives in an opposite direction to a single direction of normal operation, to resynchronize the intermediate wheel set.

Timepiece display mechanism with a fast corrector

An assembly to hold a balance spring includes a balance spring stud, and a stud-holder. The stud-holder includes a housing to receive the stud, a mechanism to secure the stud including a screw orthogonal to the stud, and a mechanism to secure the stud-holder to an escapement mechanism. The stud includes a surface to orient a balance spring. The screw partially passes through the stud to hold the stud in an indexed position. The stud includes an internal thread cooperating with the screw and forming the orientation surface. The stud-holder includes a bore for the passage of the screw, a bearing face arranged at the entry of said bore, on the opposite side to the housing, for the abutment of a head of the screw.

Timepiece balance spring stud-holder with screws

An assembly for holding a balance spring includes a stud including a surface for orienting a balance spring, and a stud-holder. The stud-holder includes a first housing for receiving the balance spring stud, a mechanism to secure the stud including a screw orthogonal to the stud, and a mechanism to secure the stud-holder to an escapement mechanism. The screw partially passes through the stud to hold the stud in an indexed position. The stud includes a second housing for the contact-free passage of the screw. The stud-holder includes on either side of the first housing an internal thread cooperating with the screw and a third bore for the passage of a head of the screw cooperating in abutment with the orientation surface.

A lever for transmitting motion from an input wheel set pivoting about a first axis on a pivoting plate of the lever, to a receiver wheel set, the input wheel set permanently transmitting its motion to an output wheel set carried by the plate and pivoting under the action of the input wheel set about a second axis whose angular position is variable relative to the first axis, and the lever includes a first friction connection between a first friction surface of the input wheel set and a second friction surface of the plate, this first friction connection is weaker or stronger than a second friction connection between a third friction surface of the output wheel set and a fourth friction surface of the plate included in the lever.

Fast correction mechanism for timepieces

The annual calendar mechanism comprises a drive wheel set () fitted with a first finger () driving a date disc () through one step once a day and a second finger () driving a plate () secured to an annual wheel () arranged coaxially to the date ring at the end of the months of less than thirty one days. An intermediate wheel () connects the annual wheel () to the date ring () at the end of each month. The annual wheel () comprises twice as many teeth () as there are months in a year and the intermediate wheel () comprises a first wheel () meshed with the annual wheel () and a second wheel () fixed to the first wheel, said second wheel being meshed, at the end of each month, with a snug () arranged inside the date ring ().

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Bienne, Switzerland

Christian Ruefenacht