US3511043A - Open end spinning device - Google Patents

Open end spinning device Download PDF

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Publication number
US3511043A
US3511043A US761425A US3511043DA US3511043A US 3511043 A US3511043 A US 3511043A US 761425 A US761425 A US 761425A US 3511043D A US3511043D A US 3511043DA US 3511043 A US3511043 A US 3511043A
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US
United States
Prior art keywords
rotor
cross
duct
open end
rotors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US761425A
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English (en)
Inventor
Adolf Schiltknecht
Max Graf
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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Publication date
Application filed by Maschinenfabrik Rieter AG filed Critical Maschinenfabrik Rieter AG
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Publication of US3511043A publication Critical patent/US3511043A/en
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-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
    • D01H4/04—Open-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 imparting twist by contact of fibres with a running surface
    • D01H4/08—Rotor spinning, i.e. the running surface being provided by a rotor
    • D01H4/10—Rotors

Definitions

  • INVENTORS HDOLF'SCH/LTKNECHT MAX eenF BY flTT'OR May 12, 1970 A.
  • the rotor is constructed with a cross-duct below the fiber collecting surface which communicates radially with the exterior of the rotor.
  • the cross-duct is wider across the rotor center than the opening communicating the cross-duct with the fiber collecting surface and is of decreasing cross-sectional area towards the rotor periphery.
  • This invention relates to an open end spinning device and more particularly to an open end spinning device having a self-generating evacuation means.
  • two types of rotors for open end spinning devices can be distinguished, namely rotors which selfgenerate a vacuum and rotors with separate external suction devices wherein the vacuum inside the rotor is created by a separate fan. Further, combinations of both rotor types can be constructed.
  • suction can be effected between a cover over the rotor or through a hollow axle carrying the rotor, the speed of such rotors generally exceeding 15,000 r.p.m. At such high rotational speeds, however, contamination caused by speed particles, fiber debris, etc. builds-up quickly and can cause yarn irregularities and excessive ends down.
  • startup and stopping as well as piecing operations are not easily controlled in such rotors. Before starting and after stopping the rotor necessarily is at a stand-still. Thus, in the absence of centrifugal forces retaining the fibers and the yarn end in the rotor groove, disturbances of the fiber arrangement, krinkling of the yarn end and unwanted slipping of the yarn end out of the rotor can occur.
  • rotors provided with suction through the hollow axle are advantageous, as vigorous suction during a rotor stand-still permits removal of fiber debris, seed particles and fiber not yet spun into the yarn.
  • certain yarn quality advantages can be achieved by means of axial suction as the fiber arrangement can be improved by clearly defined air currents.
  • axial suction also has severe disadvantages. For example, a very strong vacuum of the order of 600 to 800 mm. water column must be maintained by the suction fan if the air volume needed is to be forced through the hollow rotor axle, the diameter of which must be kept relatively small because of the bearing design for such.
  • a combination of a rotor with a fan is known in which the rotor is provided with a centrally perforated base and with a fan below the rotor base.
  • yarn formation is effected in the fiber collecting chamber above the rotor base and the vacuum is created in the chamber below the rotor base by a fan formed by radial holes with the vacuum drawn from the upper chamber via the central perforation of the rotor base.
  • This device avoids the substantial pressure drop needed for sucking the air through a hollow rotor axle.
  • manufacture of such rotors is impractical and the dimensions are lim ited.
  • building such rotors from several components designed for simplified manufacturing results in unfavorable stress distributions.
  • the fan chamber below the rotor base is practically inaccessible for cleaning purposes and the relatively small radial holes forming the fan easily tend to clog up and where fan blades are substituted for the radial hole arrangement, fiber tufts can still accumulate and be retained in the lower chamber by centrifugal forces. Such fiber accumulations can also create undesirable eccentricities which can cause overheating and premature break-down of the bearings of the rotor.
  • the invention provides a rotor of an open end spinning device with a cross-duct located centrally below the fiber collecting surface in the rotor.
  • the cross-duct communicates with the fiber collecting surface through a central aperture therebetween and functions as a vacuum generating fan to evacuate the fiber collecting sur face.
  • the cross-duct extends substantially diametrically across the rotor with a decreasing cross-sectional area from a point centrally of the rotor towards the rotor periphery.
  • the cross-duct can have opposite side walls which are convex with respect to each other or which follow a serpentine path. In either case, the cross-duct is of larger width than the opening communicating with the fiber collecting surface.
  • the cross-duct has a plurality of legs, for example, three or four, which extend radially from a central area of the cross-duct.
  • Each leg is of decreasing cross-sectional area towards the rotor periphery while the sidewalls between adjacent legs are convex in shape.
  • FIGS. 1 to 3 respectively illustrate cross-sectional views of prior open end spinning devices
  • FIG. 4 illustrates a cross-sectional view taken on line IVIV of FIG. 5 of a rotor having a cross-duct according to the invention
  • FIG. 5 illustrates a view taken on line VV of FIG.
  • FIGS. 6 to 8 respectively illustrate cross-sectional views similar to FIG. 5 of other modifications of a cross-duct according to the invention
  • FIGS. 9 and 10 respectively illustrate perspective views of further modified rotors with cross-ducts according to the invention.
  • FIGS. 11 and 12 respectively illustrate cross-sectional views of rotors employing cross-ducts of different crosssectional shapes according to the invention.
  • the heretofore known open end spinning devices have, in some instances, mounted a rotor 3 in a housing 2 which is evacuated through a suction duct 1 (FIG. 1).
  • a rotor 3 has been provided with an interior fiber collecting surface 4 in the shape of a fiber groove 5 which takes up the fibers fed in via a duct 6.
  • a cover 7 is positioned in the housing 2 over the rotor 3 to cover the open end.
  • a plurality of radial holes 8 have been formed in the groove 4.
  • the vacuum acts via a hollow rotor axle 9 into the rotor.
  • a plurality of holes 11 for generating the vacuum are arranged separately from the actual fiber collecting surface 12 in a seperate chamber connected with the collecting surface chamber by an opening 13.
  • a rotor 19 according to the invention is provided with a cross-duct 16 in a separate chamber below a fiber collecting surface 14 of the rotor 19.
  • the cross-duct 16 is connected with the collecting surface 14 by a central opening 15 and is wider across the rotor center than the opening 15.
  • the walls 17, 18 of the cross-duct 16 are concave in shape so that the cross-sectional area decreases towards the rotor periphery. The curvature of these concave walls should be kept within the limits specified in the following.
  • the straight lines G, G through the center K of the wall curvature and forming tangents of the opening 15 meet the wall surface 17 in points A and B respectively.
  • the tangents of the wall curvature in these point A and B enclose an angle a which, as proven by tests, must exceed 120 degrees if clogging is to be safely prevented.
  • the curvature of the opposite wall 18 must also fulfill the same conditions.
  • the distance A between walls 17 and 18 across the rotor center should also not exceed 225 percent of the maximum diameter D of the opening 15 which can, for example, be elliptical.
  • the upper surface limiting the cross-duct 16 is defined by the rotor base plate 20 which forms a right angle with the rotor axis, whereas the lower surface 19 limiting the cross-duct 16 forms an angle 7 of approximately 80 degrees with the rotor axis. This angle 7, however, should not be chosen smaller than 45 degrees. Such ducts will not permit any accumulation of fibers sucked accidentally from the fiber collecting surface 14 and thus danger of clogging is eliminated.
  • the cross-duct can also be made with multiple legs, for example, three.
  • the legs extend radially from the center of the rotor towards the outside.
  • the walls 21, 22, 23 of the legs are convex in shape to permit the cross-sectional areas of the legs to decrease towards the rotor periphery and are tangent to the plane of the central opening leading to the fiber collecting surface.
  • the angle B between the tangents t t, of adjacent walls 21, 22, 23 exceeds 120. As shown, the angle 5 is 150.
  • the multi-leg cross-duct can also be provided with four legs.
  • the angle 18 is 140.
  • the rotor can be provided with an asymmetric cross-duct 24 wherein half of each side wall is concave and convex, respectively.
  • the half portions of each side wall of the cross-duct 24 are shaped in a manner as above, symmetrical supplements of the wall portions being imagined for determination of the angles a and 5.
  • the angle a can also be determined by measuring the angle a/2.
  • the rotor is provided with a crossduct formed by a tube section 25 mounted on the underside of the rotor wherein the cross-sectional area remains constant.
  • the tube section 25 mounted on the rotor to form the cross-duct can be shaped rectangularly.
  • the cross-duct 2'6, 26' in communication with the fiber collecting surface can also have a trapezoidalcross-section (FIG. 11) or a circular cross-section (FIG. 12).
  • a rotor for an open end spinning device comprising a fiber collecting surface
  • each pair of adjacent legs have a common wall portion, said wall portion being convex.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
US761425A 1967-09-27 1968-09-23 Open end spinning device Expired - Lifetime US3511043A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1359267A CH457220A (de) 1967-09-27 1967-09-27 Spinnvorrichtung

Publications (1)

Publication Number Publication Date
US3511043A true US3511043A (en) 1970-05-12

Family

ID=4393710

Family Applications (1)

Application Number Title Priority Date Filing Date
US761425A Expired - Lifetime US3511043A (en) 1967-09-27 1968-09-23 Open end spinning device

Country Status (6)

Country Link
US (1) US3511043A (es)
CH (1) CH457220A (es)
DE (1) DE1785415C3 (es)
ES (1) ES358564A1 (es)
FR (1) FR1582427A (es)
GB (1) GB1245932A (es)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3651632A (en) * 1969-04-09 1972-03-28 Tmm Research Ltd Open-end spinning devices
US3837154A (en) * 1971-01-27 1974-09-24 Stahlecker Gmbh Wilhelm Spinning turbine
US3898787A (en) * 1972-05-12 1975-08-12 Krupp Gmbh Housing for open-end spinning turbine
CN114481377A (zh) * 2022-03-24 2022-05-13 杭州福恩纺织有限公司 一种用于毛型涤纶粘胶混纺纱线成型的设备及成型方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS164465B1 (es) * 1972-10-19 1975-11-07

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3339359A (en) * 1965-12-20 1967-09-05 Ripka Josef Spinning chamber for removing impurities from fibers
US3357168A (en) * 1965-12-07 1967-12-12 Vyzk Ustav Bavinarsky Spinning chamber air outlet
US3367099A (en) * 1966-03-05 1968-02-06 Vyzk Ustav Bavinarsky Sealing arrangement for a spinning apparatus
US3447298A (en) * 1967-01-31 1969-06-03 Maremont Corp Turbine spinning apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3357168A (en) * 1965-12-07 1967-12-12 Vyzk Ustav Bavinarsky Spinning chamber air outlet
US3339359A (en) * 1965-12-20 1967-09-05 Ripka Josef Spinning chamber for removing impurities from fibers
US3367099A (en) * 1966-03-05 1968-02-06 Vyzk Ustav Bavinarsky Sealing arrangement for a spinning apparatus
US3447298A (en) * 1967-01-31 1969-06-03 Maremont Corp Turbine spinning apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3651632A (en) * 1969-04-09 1972-03-28 Tmm Research Ltd Open-end spinning devices
US3837154A (en) * 1971-01-27 1974-09-24 Stahlecker Gmbh Wilhelm Spinning turbine
US3898787A (en) * 1972-05-12 1975-08-12 Krupp Gmbh Housing for open-end spinning turbine
CN114481377A (zh) * 2022-03-24 2022-05-13 杭州福恩纺织有限公司 一种用于毛型涤纶粘胶混纺纱线成型的设备及成型方法
CN114481377B (zh) * 2022-03-24 2023-01-20 杭州福恩纺织有限公司 一种用于毛型涤纶粘胶混纺纱线成型的设备及成型方法

Also Published As

Publication number Publication date
DE1785415B2 (de) 1974-12-19
FR1582427A (es) 1969-09-26
DE1785415A1 (de) 1972-03-09
GB1245932A (en) 1971-09-15
CH457220A (de) 1968-05-31
DE1785415C3 (de) 1975-07-31
ES358564A1 (es) 1970-04-16

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