Spring barrel cam

Input: pink barrel cam
The cam of helical grooves of two opposite hands and different
pitches gives the yellow slider a reciprocal linear motion. The go speed is fast and the back one is slow.
During fast stroke the pressure angle on the slider is large but the motion is possible thanks to the pushing forces of the springs.
Use a larger diameter for the cam and add a ball bearing for the blue pin if you need a smooth movement of the slider.
This mechanism has not been verified in practice.

STEP files of this video:
https://www.mediafire.com/file/mlnoz6...
Inventor files of this video:
https://www.mediafire.com/file/lgoxm5...