US3557543A - Method and apparatus for parallelizing staple fibers fed to a spinning chamber - Google Patents

Method and apparatus for parallelizing staple fibers fed to a spinning chamber Download PDF

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US3557543A
US3557543A US827548A US3557543DA US3557543A US 3557543 A US3557543 A US 3557543A US 827548 A US827548 A US 827548A US 3557543D A US3557543D A US 3557543DA US 3557543 A US3557543 A US 3557543A
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duct
staple fibers
fibers
stream
spinning chamber
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US827548A
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Hans Walter Krause
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H4/00Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/38Channels for feeding fibres to the yarn forming region

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  • This invention relates to a method and apparatus for introducing staple fibers in parallel relation into a spinning chamber of an open end spinning device. More particularly, this invention relates to a method and apparatus for placing staple fibers in parallel.
  • feed devices have been known for feeding staple fibers into a spinning chamber possessing a rotating fiber collecting surface of an open end spinning device.
  • the individual fibers have been accelerated through narrowing feed ducts into the spinning chambers to speeds approximately the circumferential speeds of the fiber collecting surface in order to straighten the otherwise curved fibers and to bring the fibers into the direction of flow of the air stream.
  • This fiber parallelization for feeding into the fiber collecting surface while being advantageous as such, however, has the disadvantage that for aerodynamic reasons the distances over which the fibers are accelerated must be relatively long, i.e. the taper of the narrowing feed duct must be feeble or of minimum value if vortex formation is to be suppressed.
  • the ratio of cross-section areas of the duct at the entry and at the exit must be chosen according to the ratio of input and output speeds of the fibers.
  • the exit cross-section area on the other hand, cannot be reduced below a certain minimum for manufacturing and technological reasons.
  • the dimensions of entry and exit cross-section areas and of the length of the duct require determination to a large extent after the ratio of speeds is chosen. This severely limits freedom of design.
  • the invention provides a method and apparatus of concentrating, parallelizing and accelerating a flow of staple fiber within a concentrated cross-sectional area within a feed duct for delivery to a fiber collecting surface in an open end spinning device.
  • the method comprises the steps of transporting a stream of staple fibers through a feed duct in an air stream under a suction force and of vigorously accelerating and pushing the staple fiber away from the interior walls of the feed duct by the use of an additional air stream directed into the interior of the duct from the extreior.
  • the additional air stream is directed into the feed duct at an intermediate free zone of the duct so as to circumferentially envelop the stream of staple fibers within a jacket or coat of air which is substantially free of staple fiber.
  • the apparatus for implementing the method includes an acceleration duct which is positioned between a fiber input point and a spinning chamber held under vacuum.
  • the duct which serves to feed a stream of staple fibers from the input point to the spinning chamber is interrupted within a short free or open zone so that exterior air can be drawn into the confines of the feed duct substantially circumferentially about the stream of staple fiber passing through the duct so as to circumferentially envelop the staple fiber stream.
  • the free zone is further in communication with a suitable chamber about the feed duct which contains a supply of air at a higher pressure than the interior of the duct.
  • the additional air which is drawn into the feed duct from the free zone serves to concentrate the staple fibers towards the center of the feed duct while maintaining the boundary layer along the interior of the feed duct substantially free of staple fiber.
  • the additional air also serves to accelerate the staple fibers while allowing the duct to have substantially the same size inlet and exit openings for difierent inlet and exit speeds for the staple fibers.
  • FIG. 1 illustrates a cross-sectional view of an open end spinning device incorporating an apparatus according to the invention
  • FIG. 2 illustrates a top view of the structure of FIG. 1
  • FIG. 3 illustrates a cross-sectional view of a modified apparatus according to the invention
  • FIGS. 4 and 5 each illustrate a cross-sectional view of other modified feed ducts according to the invention.
  • FIG. 6 illustrates a further modified feed duct according to the invention.
  • a sliver 1 of staple fibers is supplied at an input point to a needled opening roll 2 of known construction rotatably mounted within a substantially enclosed chamber of a housing.
  • the roll 2 serves, under ideal conditions, to take 01f individual fibers 3 from the sliver 1 and to transfer the fibers 3 to an air stream which enters the housing axially through an opening 4 and then flows radially of the roller chamber to a feed duct 5 within the housing.
  • the feed duct 5 is in.
  • a spinning chamber -6 in the housing which possesses a rotatable fiber collecting surface 7 mounted on a rotor 8.
  • the rotor 8 serves to rotate the collecting surface 7, as is known, at high rotational speeds sufficient to generate a vacuum.
  • said feed duct has a section between said free zone and the spinning chamber, said section having a funnel-like end overlapping said free zone.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Abstract

A STREAM OF STAPLE FIBER PASSING THROUGH A FEED DUCT IS SURROUNDED BY AN ENVELOPING AIR JACKET SO THAT THE FIBERS ARE CONCENTRATED TOWARDS THE CENTRAL AXIS OF THE DUCT. THE AIR JACKET IS FORMED BY DRAWING AN ADDITIONAL SOURCE OF AIR INTO THE DUST THROUGH AN ANNULAR FREE ZONE.

Description

United States Patent Office 3,557,543 Patented Jan. 26, 1971 ,910 Int. Cl. G01h 7/00,- D01g 23/08 US. Cl. 57-58.95 15 Claims ABSTRACT OF THE DISCLOSURE A stream of staple fiber passing through a feed duct is surrounded by an enveloping air jacket so that the fibers are concentrated towards the central axis of the duct. The air jacket is formed by drawing an additional source of air into the duct through an annular free zone.
This invention relates to a method and apparatus for introducing staple fibers in parallel relation into a spinning chamber of an open end spinning device. More particularly, this invention relates to a method and apparatus for placing staple fibers in parallel.
Heretofore, feed devices have been known for feeding staple fibers into a spinning chamber possessing a rotating fiber collecting surface of an open end spinning device. In some instances, the individual fibers have been accelerated through narrowing feed ducts into the spinning chambers to speeds approximately the circumferential speeds of the fiber collecting surface in order to straighten the otherwise curved fibers and to bring the fibers into the direction of flow of the air stream.
This fiber parallelization for feeding into the fiber collecting surface, while being advantageous as such, however, has the disadvantage that for aerodynamic reasons the distances over which the fibers are accelerated must be relatively long, i.e. the taper of the narrowing feed duct must be feeble or of minimum value if vortex formation is to be suppressed. Also, the ratio of cross-section areas of the duct at the entry and at the exit must be chosen according to the ratio of input and output speeds of the fibers. The exit cross-section area, on the other hand, cannot be reduced below a certain minimum for manufacturing and technological reasons. Thus, the dimensions of entry and exit cross-section areas and of the length of the duct require determination to a large extent after the ratio of speeds is chosen. This severely limits freedom of design. Further, as the fibers become distributed across approximately the whole duct cross-section area, a further disadvantage is noted in that the fibers in proximity of the duct walls become decelerated by the duct wall boundary layer which increases in thickness in the direction of the flow of the medium. Thus, any fiber straightening and parallelization which is achieved is subsequently impaired.
Accordingly, it is an object of the invention to keep the fiber stream away from the interior walls of a feed duct.
It is another object of the invention to concentrate the fiber stream in the center of an acceleration duct.
Briefly, the invention provides a method and apparatus of concentrating, parallelizing and accelerating a flow of staple fiber within a concentrated cross-sectional area within a feed duct for delivery to a fiber collecting surface in an open end spinning device.
The method comprises the steps of transporting a stream of staple fibers through a feed duct in an air stream under a suction force and of vigorously accelerating and pushing the staple fiber away from the interior walls of the feed duct by the use of an additional air stream directed into the interior of the duct from the extreior. The additional air stream is directed into the feed duct at an intermediate free zone of the duct so as to circumferentially envelop the stream of staple fibers within a jacket or coat of air which is substantially free of staple fiber.
The apparatus for implementing the method includes an acceleration duct which is positioned between a fiber input point and a spinning chamber held under vacuum. The duct which serves to feed a stream of staple fibers from the input point to the spinning chamber is interrupted within a short free or open zone so that exterior air can be drawn into the confines of the feed duct substantially circumferentially about the stream of staple fiber passing through the duct so as to circumferentially envelop the staple fiber stream. The free zone is further in communication with a suitable chamber about the feed duct which contains a supply of air at a higher pressure than the interior of the duct. The additional air which is drawn into the feed duct from the free zone serves to concentrate the staple fibers towards the center of the feed duct while maintaining the boundary layer along the interior of the feed duct substantially free of staple fiber. The additional air also serves to accelerate the staple fibers while allowing the duct to have substantially the same size inlet and exit openings for difierent inlet and exit speeds for the staple fibers.
These and other objects and advantages of the invention will become more aparent from the following detailed description and appended claims taken in conjunction with the accompanying drawings in which:
FIG. 1 illustrates a cross-sectional view of an open end spinning device incorporating an apparatus according to the invention;
FIG. 2 illustrates a top view of the structure of FIG. 1;
FIG. 3 illustrates a cross-sectional view of a modified apparatus according to the invention;
FIGS. 4 and 5 each illustrate a cross-sectional view of other modified feed ducts according to the invention; and
FIG. 6 illustrates a further modified feed duct according to the invention.
Referring to FIGS. 1 and 2, a sliver 1 of staple fibers is supplied at an input point to a needled opening roll 2 of known construction rotatably mounted within a substantially enclosed chamber of a housing. The roll 2 serves, under ideal conditions, to take 01f individual fibers 3 from the sliver 1 and to transfer the fibers 3 to an air stream which enters the housing axially through an opening 4 and then flows radially of the roller chamber to a feed duct 5 within the housing. The feed duct 5 is in.
communication with a spinning chamber -6 in the housing which possesses a rotatable fiber collecting surface 7 mounted on a rotor 8. The rotor 8 serves to rotate the collecting surface 7, as is known, at high rotational speeds sufficient to generate a vacuum.
Jan. 26, 1971 w, KRAUSE 3,557,543
METHOD AND APPARATUS FOR PARALLELIZING STAPLE FIBERS FED TO A SPINNING CHAMBER Filed May 26, 1969 v I I A" a! 2 Fig. 1
i INVEN'IOR. HANS w.- Rpm/6E point and said free zone for pre-accelerating the stream of staple fibers prior to passage through said free zone.
11. An apparatus as set forth in claim 8 wherein said feed duct has a tapered second section between said free zone and the spinning chamber for further accelerating the stream of staple fibers after passage through said free zone.
12. An apparatus as set forth in claim 8 wherein said feed duct is of a constant cross-section between the input point and said free zone.
13. An apparatus as set forth in claim 8 wherein said feed duct is of a constant cross-section between said free zone and the spinning chamber.
14. An apparatus as set forth in claim 8 wherein said feed duct has a pair of said free zones in spaced relation to each other therein for stepwise acceleration of the stream of staple fibers.
15. An apparatus as set forth in claim 8 wherein said free zone is positioned intermediately of said feed duct,
and wherein said feed duct has a section between said free zone and the spinning chamber, said section having a funnel-like end overlapping said free zone.
References Cited UNITED STATES PATENTS I 3,355,869 12/1967 Vorisek 57-58.95 3,360,917 1/1968 Kubovy et a1 57-5895 3,440,812 4/1969 Stary et a1 57-58.95X 3,445,993 5/1969 Vorisek 57-58.95X 3,455,097 7/1969 Raj-noha et al. 57-5895 3,487,626 1/1970 Rajnoha et al 57-5831 3,501,907 3/1970 Tabata et al. 5758.89X
DONALD E WATKINS, Primary Examiner US. Cl. X.R. 57-156
US827548A 1968-05-24 1969-05-26 Method and apparatus for parallelizing staple fibers fed to a spinning chamber Expired - Lifetime US3557543A (en)

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CH791068A CH464026A (en) 1968-05-24 1968-05-24 Method for parallelizing staple fibers in a feed channel to a spinning chamber of an open-end spinning device and device for carrying out the method

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CH (1) CH464026A (en)
DE (1) DE1925999A1 (en)
FR (1) FR2009234A1 (en)
GB (1) GB1264882A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52143427U (en) * 1976-04-16 1977-10-31
US4539808A (en) * 1982-03-20 1985-09-10 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Fiber control apparatus in an open-end spinning frame
WO1986007392A1 (en) * 1985-06-07 1986-12-18 Alan Nicholas Jacobsen Improved method and apparatus for spinning yarn
US4998404A (en) * 1988-12-23 1991-03-12 Savio S.P.A. Method and device for removing deteriorated fibres during yarn rejoining in an open-end spinning machine
US5117622A (en) * 1989-05-18 1992-06-02 Hans Stahlecker Fiber supply arrangement for open-end rotor spinning
US5361574A (en) * 1992-08-22 1994-11-08 Rieter Ingolstadt Spinnereimaschinenbau Ag Process and device for pneumatic feeding of fibers to the fiber collection surface of an open-end spinning element
US5373690A (en) * 1992-08-22 1994-12-20 Rieteringolstadt Spinnereimaschinenbau Ag Process and device for pneumatic conveying of fibers to the fiber collection surface of an open-end spinning element

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS150358B1 (en) * 1969-09-16 1973-09-04
CS168160B1 (en) * 1972-06-08 1976-05-28
DE2364261C3 (en) * 1973-12-22 1982-12-23 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt Fiber feeding device for an open-end spinning device working with negative pressure
CS183469B1 (en) * 1976-07-08 1978-06-30 Ludvik Fajt Method of and apparatus for conveying fibrous material in open-end rotor spinning machines
DE2811882A1 (en) * 1978-03-18 1979-10-04 Barmag Barmer Maschf OPEN-END SPINNING DEVICE
IN166212B (en) * 1984-11-13 1990-03-31 Rieter Ag Maschf
JPH0742618B2 (en) * 1985-08-10 1995-05-10 株式会社豊田自動織機製作所 Adsorption twisting spinning device
DE102011102883A1 (en) * 2011-05-31 2012-12-06 Oerlikon Textile Gmbh & Co. Kg Open-end spinning device
FR3114188B1 (en) 2020-09-11 2024-01-12 Dolphin Design Adaptive Substrate Polarization Using Margin Detectors

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52143427U (en) * 1976-04-16 1977-10-31
JPS5642370Y2 (en) * 1976-04-16 1981-10-03
US4539808A (en) * 1982-03-20 1985-09-10 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Fiber control apparatus in an open-end spinning frame
WO1986007392A1 (en) * 1985-06-07 1986-12-18 Alan Nicholas Jacobsen Improved method and apparatus for spinning yarn
GB2188337A (en) * 1985-06-07 1987-09-30 Jacobsen Alan Nicholas Improved method and apparatus for spinning yarn
US4821505A (en) * 1985-06-07 1989-04-18 Jacobsen Alan N Method and apparatus for spinning yarn
GB2188337B (en) * 1985-06-07 1989-07-26 Jacobsen Alan Nicholas Improved method and apparatus for spinning yarn
US4998404A (en) * 1988-12-23 1991-03-12 Savio S.P.A. Method and device for removing deteriorated fibres during yarn rejoining in an open-end spinning machine
US5117622A (en) * 1989-05-18 1992-06-02 Hans Stahlecker Fiber supply arrangement for open-end rotor spinning
US5361574A (en) * 1992-08-22 1994-11-08 Rieter Ingolstadt Spinnereimaschinenbau Ag Process and device for pneumatic feeding of fibers to the fiber collection surface of an open-end spinning element
US5373690A (en) * 1992-08-22 1994-12-20 Rieteringolstadt Spinnereimaschinenbau Ag Process and device for pneumatic conveying of fibers to the fiber collection surface of an open-end spinning element

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Publication number Publication date
CH464026A (en) 1968-10-15
DE1925999A1 (en) 1969-12-04
FR2009234A1 (en) 1970-01-30
GB1264882A (en) 1972-02-23

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