Weft feeding drum with laming array brake
AssigneeL.G.L. Electronics S.p.A.
InventorPietro Zenoni
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Abstract
A weft feeding device, for weaving looms, of the type comprising a drum for winding the thread and an array of metallic laminas for braking the thread which unwinds from the drum. The metallic laminas are arranged on the surface of a rotational paraboloid. The paraboloid is fitted on the drum and is tangent thereto, to elastically engage a thread, at its own minimum-radius circumference. The paraboloid has one end rigidly coupled to a fixed supporting ring which encircles the drum, the other free of the paraboloid end being subject to the action of a movable ring which, when moved axially with respect to the paraboloid, varies the paraboloid's curvature in order to correspondingly vary the contact pressure of the laminas on the thread.
Claims12
A weft feeding device, for looms, of the type comprising a drum for winding the thread and means for braking the thread which unwinds from the drum including an array of metallic laminas fitted on and tangent to the drum, wherein said array of laminas is arranged according to the surface of a rotational paraboloid, said paraboloid having a minimum-circumference radius, said paraboloid elastically engaging the thread at said own minimum-circumference radius;
- said paraboloid having one end rigidly coupled to a fixed supporting ring which encircles the drum and its other free end subject to the action of a movable ring which, when moved axially with respect to the paraboloid, varies curvature of said paraboloid to correspondingly vary the contact pressure of the laminas on the thread.
Dependencies are inferred from the claim text.