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AssigneeVyzkumny ustav bavlnarsky
InventorsStanislav Didek, Ludvik Fajt, Jaroslav Storek, Jiri Andres, Frantisek Cada, Marie Markova
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A method of and apparatus for frictional open-end spinning which is an improvement upon that disclosed by the co-assigned U.S. Pat. No. 4,168,601. Continuously supplied separated fibers are deposited onto a first, frictional carrying surface provided on a revolving carrier and designed for conveying the fibers to the mouth of a wedge-like gap defined by said frictional carrying surface and a second frictional surface provided on a second revolving carrier moving in said wedge-like gap in the opposite direction relative to the first, frictional carrying surface. The fibers are twisted to yarn in the mouth of the wedge-like gap due to the contact with said frictional surfaces of which one is convex and the other concave. The yarn is withdrawn from said gap in a lateral direction and the twist propagation is prevented. The fibers supplied by the frictional carrying surface into the wedge-like gap are transferred, at least in a yarn preforming region followed by a yarn finishing region, immediately downstream of the mouth of the wedge-like gap, by the action of a first force onto said second frictional surface, from which the fibers after having left the wedge-like gap, are transferred by the action of a second force again onto said frictional carrying surface upstream of the mouth of said wedge-like gap.
In a method of frictional spinning based upon the open-end principle, comprising depositing continuously supplied separated fibers onto a frictional carrying surface provided on a revolving carrier and designed for conveying the fibers to the mouth of a wedge-like gap defined by said frictional carrying surface and a second frictional surface provided on a second revolving carrier moving in said wedge-like gap in the opposite direction relative to the frictional carrying surface, twisting the fibers to yarn in the wedge-like gap due to the contact with said frictional surfaces, and withdrawing the yarn from said gap in a lateral direction while preventing twist propagation, the improvement wherein the wedge-like gap has a yarn preforming region followed by a yarn finishing region, the fibers supplied by the frictional carrying surface into the wedge-like gap are transferred, in the yarn preforming region, immediately downstream of the mouth of the wedge-like gap, by the action of a first force, onto said second frictional surface, from which the fibers after having left the wedge-like gap, are transferred again by the action of a second force to said frictional carrying surface upstream of the mouth of said wedge-like gap, whereby the fibers are positively caused to circulate in the yarn preforming region.
In an apparatus for frictional spinning based upon the open-end principle, including means for depositing continuously supplied separated fibers onto a frictional carrying surface provided on a revolving carrier and designed for conveying the fibers to the mouth of a wedge-like gap defined by said frictional carrying surface and a second frictional surface provided on a second revolving carrier and moving in said wedge-like gap in the opposite direction relative to the frictional carrying surface, means for twisting the fibers to yarn in the mouth of the wedge-like gap due to the contact with said frictional surfaces, and means for withdrawing the yarn from said gap in a lateral direction while preventing twist propagation, the improvement wherein the wedge-like gap has a yarn preforming region followed by a yarn finishing region, and the second frictional surface is perforated at least in the yarn preforming region and comprising a suction field downstream of the mouth of the wedge-like gap, said suction field being sharply defined in said mouth of the wedge-like gap, said suction field transferring the fibers from the frictional carrying surface onto the second frictional surface, the frictional carrying surface being perforated at least in the yarn preforming region, a suction field being disposed upstream of the mouth of the wedge-like gap for transferring the fibers upstream of the wedge-like gap from the second frictional surface onto the first frictional carrying surface.
In an apparatus for frictional spinning based upon the open-end principle, including means for depositing continuously supplied separated fibers onto a first frictional carrying surface provided on a first revolving outer carrier and designed for conveying the fibers to the mouth of a wedge-like gap defined by said first frictional carrying surface and a second frictional surface provided on a second inner revolving carrier disposed within the outer carrier and moving in said wedge-like gap in the opposite direction relative to the frictional carrying surface, means for twisting the fibers to yarn in the mouth of the wedge-like gap due to the contact with said frictional surfaces, and means for withdrawing the yarn from said gap in a lateral direction while preventing twist propagation, the improvement wherein the wedge-like gap has a yarn preforming region followed by a yarn finishing region, and on the second frictional surface which is constituted by the frictional surface of the inner carrier and which is perforated at least in the yarn preforming region a suction field is provided downstream of the mouth of the wedge-like gap in the yarn preforming region, said field being sharply defined in said mouth of the wedge-like gap, for transferring the fibers from the first frictional carrying surface, constituted by the frictional surface of the outer carrier, onto the second frictional surface of the inner carrier from which the fibers, after having been carried off the wedge-like gap, are transferred by centrifugal force back onto the first frictional surface of the outer carrier.
An apparatus as claimed in 17, wherein the wall of the holes is a surface of rotation.
Dependencies are inferred from the claim text.