Perfecta 92TS cams

Hello, I just had a question about what do the knife backing cams do? At the start of changing blades you rotate the cams counter clockwise, but I guess i never have heard what their actual purpose is. I would just like to know for more knowledge.

 

Hi sir;

The purpose is the cam +limit switch in gear, get the Most higher position, in order, to the next time,
that you press the cut button, the knife goes down,otherwise, the knife will be in the position middle, or NOT work at all.
By that reason the Knife must be in the Higher TOP position very well!