Retracting idler

Explore how idler motion changes web wrap, opens clearance and restores contact during a release cycle.

What happens when a roller leaves the moving web?

Original 3D simulation of roller release and re-engagement.

What you can model

A movable idler supports a taut web between the surrounding rollers. The assembly diagram identifies the roller arrangement, while the animation shows the idler lowering and rising. Prescribing that stroke lets the model follow the changing web path as contact is lost and regained.

Retracting-idler assembly.
Retracting-idler assembly.

What you can explore

Read the geometry plot to connect roller stroke with wrap and clearance. The time history then shows how those quantities develop through a complete release-and-return cycle. Wrap falls to zero while clearance is open, then builds again as the idler rises into contact.

Wrap and clearance as the idler moves through its stroke.
Wrap and clearance as the idler moves through its stroke.
Wrap falls to zero during retraction and returns as the idler rises. Clearance marks the interval without contact.
Wrap falls to zero during retraction and returns as the idler rises. Clearance marks the interval without contact.

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