Saw blade adjustment mechanism for sawmill

Two motors (not shown) rotate orange pulleys.
The saw spindles can rotate with the orange pulleys and slide in their holes thanks to the sliding key joints.
A motor (not shown) rotates the red screw to control positions of the two saw spindles via the nut-screw drives and pink arms.
The red screw of two opposite hand threads ensures synchronuous movement of the two saw spindles.
This video was made following a YouTube viewer's request to explain the video
https://youtu.be/0d3jdOv-3o8

Видео Saw blade adjustment mechanism for sawmill канала thang010146