Two jaw self-centering clamping mechanism 2

This mechanism is applied to carton box stretch wrapping machine.
Each yellow slider has a brown pin that moves in the helix groove of the blue screw. The screw has two helix grooves with opposite helical directions.
Squeeze the red lever to unlock the yellow slider and push it to clamp the carton box or pull it to increase the distance between the two blue clamping jaws.
The blue spring always presses the red lever against the surface of the round table.
The locking action occurs only when the jaws move outwards.
A video showing how a carton box stretch wrapping machine works:
https://youtu.be/gAONoTb5mD8

Inventor files of this video:
https://www.mediafire.com/file/yx8yfvg9h7snj00/TwoJawSelfCenterClamp2Inv.zip/file

Видео Two jaw self-centering clamping mechanism 2 канала thang010146