Rotating-reciprocating mechanism converts rotating movement into reciprocating movement in order to move the screen.

To prevent the rotating movement of the workpiece, the moment at each clamping point caused by the cutting force has to be eliminated by the forces at the clamping points.

Extruder from inhaling the material into the mouth of two intermediate gears, and with this space, with the teeth of the shell along the rotating movement, in the last two teeth from when mating.