US 4,901,518 AGranted

Open end friction spinning device for production of a yarn or the like

AssigneeMaschinenfabrik Rieter AG

InventorsHerbert Stalder, Urs Keller, Emil Briner, Werner Oeggerli, Arthur Wurmli

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Abstract

The wall of the friction spinning element has bores or holes with a predeterminate bore diameter and a coating on their side facing a fiber feed duct, the coating extending over the bore edges into the bores. Each bore or hole thus formed has a diameter at the bore or hole entrance or inlet which is smaller than the bore diameter of the related bore or hole. Each bore or hole has a cross-sectional area of less than 0.283 mm.sup.2, but amounting to at least 0.07 mm.sup.2. In this way, the undesirable penetration of fibers or fiber parts into the bores or holes is prevented as far as possible when air flows through the bores or holes at the side of the coating, while retaining a hole form or configuration which is favorable from the standpoint of airflow and blockage of the bores or holes.

Claims12

Dependent claims

An open-end friction spinning device for production of a yarn or the like by means of friction spinning, comprising:

two coacting friction spinning means defining therebetween a convergence zone and movable relative to each other;
at least one of said friction spinning means being provided with a coating forming a friction surface and holes extending through said friction surface for throughflow of air in a predeterminate airflow direction;
said at least one friction spinning means defining a perforated friction spinning means having said friction surface;
a fiber sliver opening roller positioned to cooperate with said two coacting friction spinning means;
a fiber feed duct extending between said fiber sliver opening roller and said at least one perforated spinning means for pneumatic transport of fibers to the friction surface of said at least one friction spinning means;
a yarn formation position located on the friction surface of said at least one friction spinning means at the region of said convergence zone between said two coating friction spinning means;
a yarn withdrawal device for withdrawing yarn spun at the yarn formation position;
said coating defining an entrance opening at each one of said holes;
said entrance opening having a cross-sectional area which is less than 0.196 mm.sup.2, but amounts to at least 0.07 mm.sup.2 ;
each one of said holes having a predeterminate depth and a predeterminate width;
said coating extending only into part of said predeterminate depth of each one of said holes;
each one of said entrance openings widening, as viewed in said predeterminate airflow direction, along said part of said predeterminate depth to said predeterminate width of the associated hole;
and
said coating having a thickness which amounts to at least 0.05 mm.

11 more elements

An open-end friction spinning device for production of a yarn or the like by means of friction spinning, comprising:

two coating friction spinning means defining therebetween a convergence zone and movable relative to each other;
at least one of said fiction spinning means being provided with a galvanically applied coating forming a friction surface and holes for throughflow of air in a predeterminate airflow direction;
said galvanically applied coating having a thickness which amounts to at least 0.05 mm;
said at least one friction spinning means defining a perforated friction spinning means having said friction surface;
a fiber sliver opening roller positioned to cooperate with said two coating friction spinning means;
a fiber feed duct extending between said fiber sliver opening roller and said at least one perforated spinning means for pneumatic transport of fibers to the friction surface of said at least one friction spinning means;
a yarn formation position located on the friction surface of said at least one friction spinning means at the region of said convergence zone between said two coating friction spinning means;
a yarn withdrawal device for withdrawing yarn spun at the yarn formation position;
each hole having a predeterminate width and a predeterminate depth;
said galvanically applied coating which forms said friction surface, extending into said holes into only part of the predeterminate depth of said holes;
said galvanically applied coating defining an entrance opening at each one of said holes;
said entrance opening defined by said galvanically applied coating, having a predeterminate width smaller than said predeterminate width of the associated hole and a cross-sectional area which is smaller than 0.2983 mm.sup.2 and amounts to at least 0.07 mm.sup.2 ;
and
said entrance opening widening, as viewed in said predeterminate airflow direction, along said part of said predeterminate depth of the associated hole to said predeterminate width of the associated hole.

11 more elements

Dependencies are inferred from the claim text.