Methods and apparatus for interfolding endless paper webs

摘要

A machine for interfolding webs of material which includes a plurality of interfolding mechanisms for interfolding webs into a plurality of elongate bundles. Drive mechanism is provided for advancing first and second ones of the bundles in taut condition, with the second bundle being disposed beneath the first bundle. First and second fold plates are disposed vertically intermediate the first and second bundles. These plates are inclined relative to a vertical plane and lie in generally mutually parallel planes. The first fold plate is arranged to guide the top web of the first bundle in an upwardly unfolded condition during advancement of the first bundle. The second fold plate is arranged to guide the bottom web of the second bundle in a downwardly unfolded condition during advancement of the second bundle. The first and second fold plates terminate prior to the point where the second bundle is deposited onto the first bundle, thereby allowing the tautly maintained, unfolded webs to assume an interfolded posture. The interfolding mechanisms each include a folding assembly which includes a stub element in the shape of a segmented curve. A rotatable roll is disposed intermediate a discharge edge of the stub element and a folding plate. A web slides over the stub element and is discharged from the discharge edge in a non-tangential direction onto the guide roller. The stub element is pivotably displaceable away from the guide roller to facilitate access to the mechanism.