The operating system consists of three components.

Pendulum catcher
The pendulum catcher F holds the pendulum A in its outermost position by means of the wire AF. At the same time, in the column F (indirect via the wire AF) the swing of the pendulum A is measured and the number of swings is counted.

The winder J pulls the weights E and D up by means of the lines BJ and CJ. These are attached to the ropes BE and CD and wound around the barrels B and C in the movement itself.

The computer H controls, checks, and registers the operation of the pendulum catcher F and the winder J. The electronic clock in the computer is calibrated based on absolute time using the radio signal DCF-77.

For the purpose of simplicity, the example involves a movement with striking work that is wound every hour and that has a seconds’ pendulum. This means that one beat equals one second, and after 3600 beats the minute hand will have made one full revolution.


1. The pendulum is set in such a way that the clock runs about five seconds per hour ahead.

After 3600 beats, the pendulum A is held in its outermost position by the pendulum catcher F via the wire AF. The movement now stops and the escapement of the going train is blocked by the sideways position of the pendulum.

Because the clock is running ahead of time, the winder J has time to pull up weight D of the going train B and weight E of the striking train by means of the lines BJ and CJ.
Winding the clock takes approximately 4 seconds, and is preferably performed two minutes before the hour in order to guarantee proper functioning of the striking work.

The computer ensures that the pendulum catcher F does not let go of the pendulum A until the time on the old clock is exactly the same as the absolute time in the computer.

Now the clock runs for 3600 beats and the cycle starts again at step 1.