It is not so easy to explain as I do not know all the correct expressions in English (I am not a native speaker!).
I have marked and numbered important parts:

As the slotted disk (A) is turned, the arched spring (D) presses a pin under the regulator arm (B) against the inside of the snail-shaped guide (C) cut into the disk.
This (partly) explanation and a section of one picture has been taken from Steve´s article about the Cal. 135 - Steve I hope this does not violate your copyright and I apologize that I have not asked you prior to posting my response due to time difference...but your pics are unbeatable in quality... If yes... please contact mod to remove the picture section. Thanks!
And here is my lousy attempt to explain another interesting aspect of the movement:

The minute wheel (1) has been moved out of the center to make space for the giant balance wheel - an attempt to achieve higher accuracy
for the chronometer competitions. It was necessary to implement an additional pivot (2) to bring the power to the off center minute wheel.
Kind regards
Erich