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Title: Method of and apparatus for spinning yarns from staple fibers by an open-end spinning technique
Claims: What is claimed is: 1. In an open-end yarn spinning system, a housing comprising at least one internal bore having an axis parallel to a first axis and a common elongated stationary duct extending through the housing and intersecting each of the internal bores upstream of a first end of the duct, the regions of intersection of the duct and each bore defining a fiber-stripping zone, a combing cylinder mounted coaxially in each internal bore, the annular spaces between the periphery of each combing cylinder and the surrounding wall of the associated bore defining a fiber-separating zone whereby fiber slivers introduced into the separating zone are separated by action of the combing cylinder and separated fibers are discharged via the stripping zone into the duct to flow as a common interengaging fiber flow directly downstream in the duct toward the first end of the duct without substantial further separation when the associated combing cylinder is rotated and to effect the joining of flows of separated fibers from the first and second slivers into a common interengaging downstream flow in the portion of the duct between the fiber-stripping zone and the first end of the duct, yarn spinning means disposed at the first end of the duct for receiving said interengaging fiber flow of separated fibers discharged into the duct and flowing toward the first end, the spinning means being mounted for rotation about a second axis which is skewed relative to said first axis, and means for introducing first and second fiber slivers into spaced portions of the fiber-separating zone. 2. A system as defined in claim 1, in which two spaced internal bores are provided in the housing, the bores intersecting the ducts at axially spaced portions thereof, in which first and second ones of the combing cylinders are separately mounted for rotation in the respective bores to define first and second fiber-separating zone portions, and in which the introducing means comprises, in combination, means for applying the first fiber sliver to the first separating zone portion and for applying the second fiber sliver to the second separating zone portion. 3. A system as defined in claim 1, in which a single bore is provided in the housing, in which a single combing cylinder is disposed in the bore to define the fiber-separating zone, and in which the introducing means comprises means for individually applying the first and second fiber slivers to the fiber-separating zone at spaced portions thereof. 4. A system as defined in claim 3, in which the introducing means comprises, in combination, a fiber condenser for shaping fiber slivers applied thereto, at least one drive roller disposed for rotation adjacent an inlet portion of the fiber-separating zone, and pressure means resiliently urged against the drive roller to define therebetween a nip for drivingly receiving shaped fiber slivers from the fiber condenser. 5. A system as defined in claim 4, in which the introducing means includes separate first and second drive roller individually having axes parallel to the first axis. 6. A system as defined in claim 5, in which the first and second drive rollers are coaxial and are disposed in axially adjacent relation. 7. A system as defined in claim 5, in which the first and second drive rollers are disposed adjacent circumferentially spaced portions of the fiber-separating zone. 8. A system as defined in claim 4, in which the introducing means has a common drive roller. 9. A system as defined in claim 8, in which the pressure means comprises a spring-loaded shoe bearing against the common drive roller, the shoe having axially spaced cutouts for receiving the first and second fiber slivers. 10. A system as defined in claim 8, in which the pressure means comprises first and second spring-loaded shoes separately bearing against axially spaced portions of the common drive roller. 11. A system as defined in claim 4, in which each drive roller is fluted by means of circumferentially spaced axial corrugations. 12. A system as defined in claim 11, in which first and second ones of the drive rollers are disposed in coaxial relation, and in which the corrugations on the first drive roller are circumferentially offset with respect to the corrugations on the second drive roller. 13. A system as defined in claim 1, in which the peripheral combing surface of each combing cylinder has adjacent axially spaced portions provided with mutually distinct types of combing elements. 14. A system as defined in claim 13, in which the combing elements are saw-like projections. 15. In an open-end spinning technique wherein fiber slivers are introduced into an arcuate separating zone disposed between a rotatable combing cylinder and a surrounding bore in a housing to be separated by the action of the combing cylinder, the separated fibers being discharged into a duct which intersects the bore in the housing to form a fiber-stripping zone, the steps wherein the discharged separated fibers flow through a common duct into a yarn spinning device rotatably mounted at the downstream end of the duct; wherein the axis of rotation of the yarn spinning device is oriented in skewed relation to the axis of the bore; and wherein at least first and second separate fiber slivers are introduced at spaced portions of the separating zone so that the discharged separated fibers from the separate first and second fiber slivers are joined in a common flow in the region of the duct between the fiber-stripping zone and the downstream end of the duct. Other info: Inventors: Ripka, Josef (Usti nad Orlici, CS) Ohlidal, Vladimir (Usti nad Orlici, CS) Vobornik, Vaclav (Letohrad, CS) Junek, Jan (Usti nad Orlici, CS) Hortlik, Frantisek (Usti nad Orlici, CS) Jaros, Frantisek (Usti nad Orlici, CS) Mares, Karel (Usti nad Orlici, CS) Celerin, Pavel (Usti nad Orlici, CS) Kotrba, Zdenek (Usti nad Orlici, CS) Brozkova, Marie (Usti nad Orlici, CS) Lihtarova, Ludmila (Usti nad Orlici, CS) Application Number: 563294 Filing Date: 1975-03-31 Publication_date: 1976-12-21 Assignee: Vyzkumny Ustav Bavlnarsky (Usti nad Orlici, CS) Primary Class(es): 57/409 57/412 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Petrakes, John Assistant Examiner: Attorney: |
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