Arrangement for condensing a drafted fiber strand and method for making yarn therefrom
AssigneeSpindelfabrik Suessen, Schurr, Stahlecker & Grill GmbH
InventorNorbert Barauke
Life of this patent
Estimating the term…
Abstract
A condensing zone is arranged downstream of the front roller pair of a drafting arrangement of a spinning machine, in which condensing zone a drafted roving or a sliver is condensed. The condensing zone has a suction device which has a closed hollow profile and which serves as a sliding surface for a circulating sieve belt. The sieve belt transports the drafted fiber strand to a nipping roller, which presses the fiber strand and the sieve belt against the sliding surface at a nipping point. The fiber strand travels over an essentially in transport direction extending suction slit located in the condensing zone, which suction slit extends to the nipping point.
Claims80
An arrangement for condensing and drafting a fiber strand, comprising:
- a drafting arrangement comprising a front roller pair at a downstream end of the drafting arrangement,
- a condensing zone arranged downstream of said front roller pair,
- a stationary sliding surface in the condensing zone, said sliding surface comprising at least one suction slit extending essentially in a transport direction of the fiber strand,
- a perforated transport belt which transports the fiber strand over the sliding surface, and
- a nipping roller defining a nipping point at a delivery side of the condensing zone,
- wherein the nipping roller presses the transport belt to said nipping point on said sliding surface, and
- wherein the suction slit extends to said nipping point.
A condensing assembly for condensing a fiber strand supplied by a drafting zone, said condensing assembly being disposed in use downstream of a downstream end front roller pair of the drafting zone and comprising:
- a condensing zone having a stationary sliding surface comprising at least one suction slit extending essentially in a transport direction of the fiber strand,
- a perforated transport belt which transports the fiber strand over the sliding surface, and
- a nipping roller defining a nipping point at a delivery side of the condensing zone,
- wherein the nipping roller presses the transport belt to said nipping point on said sliding surface, and
- wherein the suction slit extends to said nipping point.
A method of making a drafted condensed fiber strand comprising:
- supplying a roving or sliver to a drafting arrangement comprising a front roller pair, to form a drafted fiber strand, and
- condensing the fiber strand in a condensing zone arranged downstream of the front roller pair, said condensing zone including:
- a stationary surface comprising at least one suction slit extending essentially in a transport direction of the fiber strand,
- a perforated transport belt which transports the fiber strand over the sliding surface, and
- a nipping roller defining a nipping point at a delivery side of the condensing zone,
- wherein the nipping roller presses the transport belt, to said nipping point on said sliding surface, and
- wherein the suction slit extends to said nipping point.
A fiber strand condensing assembly which in use is disposed downstream of a downstream end roller pair of a drafting assembly, said fiber strand condensing assembly comprising:
- a hollow member having a suction slit extending along a hollow member sliding surface section, and
- a perforated transport belt disposed to move over the sliding surface section while carrying the fiber strand,
- wherein the transport belt has plural openings disposed laterally adjacent one another which in use open to the suction slit, and
- wherein the width of the condensing zone air stream acting on the fiber strand is controlled by the width of the slit, said width being narrower than the pattern of perforation openings.
A method of making a drafted condensed fiber strand comprising:
- supplying a roving or sliver to a drafting arrangement comprising a front roller pair at a downstream end of the drafting arrangement to form a drafted fiber strand, and
- condensing the fiber strand in a condensing assembly arranged downstream of the front roller pair, said condensing zone including:
- a hollow member having a suction slit extending along a hollow member sliding surface section, and
- a perforated transport belt disposed to move over the sliding surface section while carrying the fiber strand,
- wherein the transport belt has plural openings disposed laterally adjacent one another which in use open to the suction slit, and
- wherein the width of the condensing zone air stream acting on the fiber strand is controlled by the width of the slit, said width being narrower than the pattern of perforation openings.
A condensing assembly for condensing a fiber strand supplied by a drafting zone, said condensing assembly being disposed in use downstream of a downstream end front roller pair of the drafting zone, said condensing assembly comprising:
- a hollow member having a stationary sliding surface comprising at least one suction slit extending essentially in a transport direction of the fiber strand,
- a perforated transport belt which transports the fiber strand over the sliding surface, and
- a nipping roller defining a nipping point at a delivery side of the condensing zone,
- wherein the nipping roller is a driven roller which presses the transport belt to said nipping point on said sliding surface and thereby drives the transport belt to move over the sliding surface.
A method of making a drafted condensed fiber strand comprising:
- supplying a roving or sliver to a drafting arrangement comprising a front roller pair at a downstream end of the drafting arrangement to form a drafted fiber strand, and
- condensing the fiber strand in a condensing assembly arranged downstream of the front roller pair, said condensing assembly including:
- a hollow member having a stationary sliding surface comprising at least one suction slit extending essentially in a transport direction of the fiber strand,
- a perforated transport belt which transport the fiber strand over the sliding surface, and
- a nipping roller defining a nipping point at a delivery side of the condensing zone,
- wherein the nipping roller is a driven roller which presses the transport belt to said nipping point on said sliding surface and thereby drives the transport belt to move over the sliding surface.
An arrangement for condensing and drafting a fiber strand, comprising:
- a drafting arrangement comprising a front roller pair,
- a condensing zone arranged downstream of said front roller pair,
- a stationary sliding surface in the condensing zone, said sliding surface comprising at least one suction slit extending essentially in a transport direction of the fiber strand,
- a perforated transport belt which transport the fiber strand over the sliding surface, and
- a nipping roller defining a nipping point at a delivery side of the condensing zone,
- wherein the nipping roller presses the transport belt to said nipping point on said sliding surface,
- wherein the suction slit extends to said nipping point, and
- wherein the transport belt traverses transversely to its direction of motion.
An arrangement for condensing and drafting a fiber strand, comprising:
- a drafting arrangement comprising a front roller pair,
- a condensing zone arranged downstream of said front roller pair,
- a stationary sliding surface in the condensing zone, said sliding surface comprising at least one suction slit extending essentially in a transport direction of the fiber strand,
- a perforated transport belt which transports the fiber strand over the sliding surface, and
- a nipping roller defining a nipping point at a delivery side of the condensing zone,
- wherein the nipping roller presses the transport belt to said nipping point on said sliding surface,
- wherein the suction slit extends to said nipping point, and
- wherein the top roller of the front roller pair and the nipping roller are arranged at a joint spring-loaded rocker, which is arranged at a top weighting arm of the drafting arrangement.
Dependencies are inferred from the claim text.