Material Roll Reverse Rotation for Web Tension Control

The patent applies preliminary action by rotating the material roll in the reverse direction before the threading process to build up initial web tension. This pre-tensioning action prepares the material web for subsequent acceleration without abrupt forces, preventing damage during the threading operation.

The patent applies preliminary anti-action by creating a counteracting force through reverse rotation of the material roll. This generates initial tension that counteracts the harmful abrupt acceleration forces that would otherwise damage the material web and coupling elements during threading.

The patent applies universality by making the material roll serve multiple functions: it not only stores and supplies the material web but also acts as a tensioning device through its ability to rotate in reverse. This eliminates the need for separate tensioning devices while maintaining reliable web tension control.

The patent applies self-service by enabling the material roll to perform its own tensioning function. The roll's reverse rotation capability allows it to automatically build up web tension without requiring external tensioning devices, simplifying the overall system while maintaining control reliability.