Input: blue wheel carrying two reds cutters.
Orange wire is moved by other motion source (not shown).
The wire velocity and linear velocity of the cutters are the same.
Two pink cutter carriers are pushed aside by a yellow spring. Their rest positions are adjusted thanks to brown screws.
When the wheel rotates, two grey rollers force the cutter carriers to cut the wire.
Cutting length = Pi.2R
R: distance from the cutter to rotary axis of the blue wheel.