Patent ID: 6263655
Filing Date: 2001-07-24
Classification: D01H

Abstract:
A method of making a thread using a drafting frame of a spinning machine, comprising the steps of:(a) drafting a sliver with said drafting frame by passing the sliver through a succession of drafting roller pairs to emerge at an output roller pair, the sliver emerging from said output roller pair having a traversing motion back and forth transverse to a direction of feed of the sliver;(b) bundling fibers of the sliver by contacting the sliver immediately downstream of said output roller pair on only one side of the sliver with a generally flat portion of a belt moving with said sliver in said direction over a length of a bundling zone, said belt having a surface on one side of said belt in contact with said sliver and being formed with a multiplicity of perforations open toward the sliver in an array extending over said length and of a width at least equal to a stroke of said traversing motion, and applying suction to said array of perforations with an elongated suction orifice juxtaposed with an opposite side of said belt, inclined to said direction and shaped so that the suction is applied to said sliver transversely of said direction to draw fibers of the sliver together and bundle the fibers of the sliver over the entire width of said array; and(c) twisting the sliver following the bundling thereof downstream of said belt into a single thread, said output pair of rollers and said belt being spaced and coordinated to operate with an oversupply or undersupply of the sliver depending upon fiber elongation and fiber length.