Patent ID: 6296585
Filing Date: 2001-10-02
Classification: D04B

Abstract:
A driving roller with an outer working periphery having a changeable diameter, comprising a first disk and a second disk arranged coaxially with one another and rotatable relative to one another in any operational condition, said first disk being provided with a plurality of radial guides, said second disk being provided with at least one spiral-shaped guide; a plurality of supporting bodies which have segments provided for abutment of a drive belt, first means cooperating with said radial guides and second means cooperating with said at least one spiral shaped guide and are supported by both of said means so that by a relative rotation of said disks an increase or a reduction of the diameter of the working periphery is provided, said radial guides being formed by guiding slots extending through said first disk, said first means being composed of guiding members which are slidingly guided in said guiding slots, said guiding members at both sides of said first disk being provided with guiding webs which laterally extend over said guiding slots wherein said guiding members have a thickness which substantially corresponds to a thickness of said first disk such that said first disk is arranged with a small gap between said guiding webs for being supported substantially free of pivoting and clamping.