Pforzheimer Uhrenrohwerke Porta Gmbh

Eta Sa Fabriques D'ebauches

Pforzheimer Uhren-rehwerke Porta G.m.b.h.

Wolfgang Kroener

Edwin Jakob

The date disc correction mechanism (3) of this time-piece comprises a control stem (7) movable between at least two axial positions, and on which a sliding pinion (9) and a correction pinion (17) are mounted. The sliding pinion exhibits at least one spur (28) provided in order to come into engagement with an opening (25) formed in the correction pinion in one of the axial positions of the stem (7) so as to render the correction pinion fixed in rotation with the sliding pinion (9).

Timepiece

In a drive coupling for the coupling of an adjustment shaft with the ratchet adjusting knob of a wristwatch, a slide bushing which is axially movably disposed on the adjustment shaft has a collar with sections circumferentially punched therefrom and bent axially out of the collar plane so as to form an annular cam and detent structure.

Drive coupling

A timepiece hand adjustment mechanism especially for small wristwatches comprises a control shaft with a squared key structure formed thereon and a coupling lever operating member with squared central passage disposed on the key structure so as to be movable therewith. The coupling lever operating member has a collar of which a section projects into an elongated opening in a coupling operating lever so that the lever can be pivoted by axial movement of the control shaft for coupling the adjustment mechanism while, at the same time, it can be rotated for adjusting the hand position.

Arrangement for adjusting the hand position of a watch

In a drive shaft arrangement for a timepiece provided with a minute shaft for carrying a minute hand and an hour sleeve disposed on the minute shaft for carrying an hour hand, the minute shaft is provided with a collar and carries on one side of the collar a minute gear and a pinion gear for rotation with the minute shaft and on the other side the hour sleeve which is provided with an hour gear. The hour gear has a pan-shaped cavity formed in its face adjacent the collar and a Belleville spring is disposed in the pan-shaped cavity so as to abut with its outer circumference the cavity wall and with its radially inner end the collar.

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Pforzheim, Germany

Wolfgang Kroener