In order for the shaving plane to remain the same, the width or the geometry of the guard must change. Karve like a Gillette adjustable seems to vary the gap (length of the area cycled in blue) keeping the rest of the geometry the same.
Essentially plate F is the tallest and the AA the shortest. Here are some photos of plate A (left) and E (right):
These are not perfect due to minor shooting angle errors but you can get the rough idea. Perhaps I am missing something but, in my understanding this is equivalent to the Gillette adjustable:
So at plates AA to B the angle of the shaving plane is shallow enough that the exposure is negative but as we progress to the other plates it turns positive. I hope this helps. Happy shaves!
Essentially plate F is the tallest and the AA the shortest. Here are some photos of plate A (left) and E (right):
These are not perfect due to minor shooting angle errors but you can get the rough idea. Perhaps I am missing something but, in my understanding this is equivalent to the Gillette adjustable:
So at plates AA to B the angle of the shaving plane is shallow enough that the exposure is negative but as we progress to the other plates it turns positive. I hope this helps. Happy shaves!