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Around the world at the touch of a pusher The time-zone mechanism

In an everyday situation, the zone-time wheel train is constantly in motion. However, the city ring remains stationary. They are mechanically disconnected at this time. This changes when a new zone time is set. Then, the city ring, the zone-time hand and its day/night indicator must be advanced in concert. This task is handled by a complicated correction mechanism with 67 parts, which can be operated via the time-zone correction pusher at 8 o’clock. Via the corrector lever (1), the movement of the time-zone correction pusher is transferred to the four-toothed corrector star (2). It is rigidly connected to the corrector wheel (3) which engages with the gear rim of the city ring and advances it clockwise by one 24th of a turn, equivalent to 15 degrees. The motion of the city ring is transferred to the city correction pinion (4) and then to the zone-time correction wheel (5). Via the lower protruding teeth of the city correction pinion, this pinion and the wheel are only briefly engaged for the duration of the switching procedure, after which they are uncoupled again. Via the day/night indicator wheel (6) and an intermediate wheel (7), the rotary motion of the correction wheel switches the twelve-toothed hour-wheel pipe by one tooth, causing the zone-time hour hand to advance by one hour.

The components of the time-zone mechanism: hours and minutes, subsidiary seconds, day/night indicator and outsize date (home time); hours and minutes, day/night indicator and the time zone currently displayed on the city ring (zone time)

Home time 

1 Hours and minutes
2 Subsidiary seconds
3 Day/night indicator
4 Outsize date display

Zone time
 

5 Hours and minutes
6 Day/night indicator
7 Currently displayed time zone on city ring

 

LANGE 1 TIME ZONE in honey gold

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