When they developed the strikework for this watch, the engineers harnessed the principle of the jumping numerals mechanism: instead of with hands, the time is displayed with an hour ring and two minute discs. This allows three snails connected with these mechanical display elements to separately sample the number of hours, ten-minute intervals, and minutes to be acoustically indicated.
The energy needed by the striking mechanism is provided by the mainspring. When the strikework is activated, the ratchet wheel is uncoupled from the winding train. Therefore, the ratchet wheel can turn freely and power the striking mechanism. This also prevents the winding train including the crown from turning during the repeater sequence, which would imply a loss of energy.
To guarantee the flawless interaction of the complex mechanical ensemble, elaborate safety and blocking mechanisms have been integrated into the movement. While the repeater is working, the switching action of the numerals discs is delayed. At the same time, the crown cannot be pulled and consequently, the time cannot be set. This precaution prevents any interference with the strikework sampling sequence and ensures that the acoustic indication of time precisely corresponds with the digitally displayed time. At 12:59 hrs when the longest series of tones is struck, it takes about 20 seconds until the repeater sequence has ended.
A. Lange & Söhne
Small Seconds, Jumping Hours, Jumping Minutes
Price: $ 289
Introduced at SIHH 2015, the Zeitwerk Minute Repeater combines the signature digital display of the Zeitwerk collection with a decimal repeater. The acoustic time indication consists of a low-pitched tone for each elapsed hour, a double tone for each elapsed ten-minute period, and a high-pitched tone for each elapsed minute. Thus, the time as sounded corresponds exactly to the time as displayed.
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A. Lange & Söhne - A breath of Saxon spirit
Montres Le Guide 11-12
Barely four years after German reunification, Gunter Blumlein realized his big dream: restoring the Lange name to its former luster and at the same time re-launching traditional German fine watchmaking, historically based in Glasshutte, in Saxony. For this captain of industry, at the time head of Jaeger-LeCoultre and IWC (since acquired by the Richemont group) and an associate of Walter Lange, great grandson of Ferdinand Adolph Lange who founded the company in 1845, this rebirth was something of a national symbol...