And I love cappuccino, too. ๐
And the construction of the whole mechanism is really fascinating!!
Rotational motion (and torque) is translated into linear motion with each passing hour.
If you have a closer look you see that the numerals for the hours are on the left side. 
The hour-arm moves along an arc while the indicator slides in a straight path because it slides along that slot.
The end of the lever arm that shows the hours has a slot running parallel to its length, which is fitted to a freely moving pin underneath the white indicator. So this arm needs to extend past the windows as it travels through its arc, extending the furthest in the center around 6 and 7.
This is exactly opposite the wheel driving it which is mounted beneath the 15-minute numerals.