Classifications

• • 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

• the invention relates to a method of a yarn production in a spinning rotor in which the singled out fibres delivered to the spinning rotor are collected into a fibre band which is continuously drawn off into the direction of the spinning rotor axis and transformed into yarn by twisting.
• the invention also relates to a device for carrying out the method of the yarn production in a spinning rotor comprising a slide surface widening in the direction towards the spinning rotor bottom and passing in its widest section into a collecting surface continued from the opposite side by a surface narrowing in the direction away from the collecting surface while inside the spinning rotor there is seated a deflector on whose friction area provided behind the radial plane passing through the collecting surface the yarn being produced is being drawn off.
• the invention also relates to other devices for carrying out the method of yarn production in a spinning rotor comprising a slide surface widening in the direction away from the inlet opening of the spinning rotor and passing in its widest section into a collecting surface continued from the opposite side by a surface narrowing in the direction away from the collecting surface while inside the spinning rotor there is seated a draw-off trumpet of the yarn being produced.
• spindleless spinning In comparison with the classical ring-spun yarn, the quality of the existing yarns produced by new spinning methods (spindleless spinning) is inferior both in strength and in appearance and is thus a limiting factor for their use for a number of final products, in particular in woven fabrics. From the point of view of the utility properties of these spindleless yarns, a predominant position is held by the rotor yarn, known also as the yarn produced by the open-end spinning method. This yarn comes nearest the classical ring-spun yarn in its character and can in many instances substitute it. However, even its strength and surface appearance still is inferior to the classical yarn.
• the patent DE 15 60 302 C3 solves in principle only the optimizing of the infiltration of the supplementary false-twist arising on the collecting surface by means of letting the yarn roll on mutually adjustable friction areas of a telescopically arranged draw-off trumpet. Even if the invention makes use of the yarn rolling on the bottom of the spinning rotor in order to obtain smooth yarn surface, it does not solve, and cannot eliminate, the drawbacks described above.
• the section of the fibre band collecting on the collecting surface and not reinforced by twisting can be, under the tension produced by the centrifugal force and the yarn draw-off, moved from the collecting surface out of the range of the fibres of the newly forming fibre band, and the subsequently tightened fibre band becomes reinforced and transformed into yarn at the end of the section not reinforced by twisting by means of the infiltration of the full twist.
• the section not reinforced by twisting of the fibre band also can be acted upon by a centrifugal force resoluted into a stretching component, acting in the fibre band against the direction of its draw-off and thus producing tension in the not reinforced fibre band section, and into a pressure component pressing the by the twist not reinforced fibre band section onto the respective surface of the spinning rotor and thus preventing the infiltration of the twist into the by the twist not reinforced fibre band section from which at its end yarn is formed under axial tension.
• the first variant of the device for carrying out the method according to the invention comprises a spinning rotor with a slide surface widening in the direction towards the spinning rotor bottom and passing in its widest section into a collecting surface continued in the opposite direction from the collecting surface by a narrowing surface, having inside the spinning rotor a draw-off trumpet or a deflector on whose friction area provided behind the slide surface and a radial plane passing through the collecting surface the yarn being produced is drawn-off, and the principle of the invention consists in that the narrowing surface of the spinning rotor is made as a yarn-forming surface defining the length of the by the twist not reinforced fibre band section by intersecting at the spot of the yarn creation an auxiliary conical surface which is the tangent of the collecting surface of the spinning rotor and of the friction area of the draw-off trumpet or of the friction area of the deflector.
• Another variant of the device for carrying out the method according to the invention comprises a spinning rotor whose slide surface widens from the inlet opening in the direction inside and passes in its widest place into a collecting surface, having inside the spinning rotor mounted a draw-off trumpet or a deflector on whose friction area, provided behind the slide surface and a radial plane passing through the collecting surface, the yarn being produced is drawn off.
• the principle of this device consists in that the narrowing surface of the spinning rotor is made as a yarn-forming surface defining the length of the by the twist not reinforced fibre band section due to the fact that its surface adjoining the collecting surface is inclined in the direction of the drawn-off (delivered) yarn intersecting at the spot of the yarn creation the path of a balloon which would be formed by a drawn off yarn freely rotating between the collecting surface and the draw-off trumpet or the deflector.
• Still another variant of an example of a device for carrying out the method of yarn production according to the invention comprises a spinning rotor with a slide surface widening in the direction towards the spinning rotor bottom and passing in its widest section into a collecting surface continued in the opposite direction from the collecting surface by a narrowing surface, having inside the spinning rotor a draw-off trumpet or a deflector on whose friction area provided behind the slide surface and a radial plane passing through the collecting surface the yarn being produced is drawn off.
• the principle of this device consists in that the narrowing surface of the spinning rotor is made as a yarn-forming surface defining the length of the by the twist not reinforced fibre band section by intersecting an auxiliary conical surface forming the tangent of the collecting surface of the spinning rotor and of the friction area of the deflector or of the draw-off trumpet and passes into an inclination adjoining the drawn off (delivered) yarn intersecting at the spot of the yarn creation the path of a balloon which would be formed by a drawn off yarn freely rotating between the collecting surface and the draw-off trumpet or the deflector.
• the diameter of the collecting surface is preferably inferior to the distance between the draw-off trumpet and the radial plane passing through the collecting surface.
• the yarn-forming surface can be made as a conical surface whose apex angle is inferior to 60°.
• the yarn-forming surface can consist of a number of conical surfaces joined to each other, or its axis section can be a curve.
• Fig. 1 is a cross section of a schematical arrangement of a device suitable in particular for very high rotation speed in which the process of yarn forming goes in the spinning rotor in the direction identical with its delivery from the spinning rotor
• Fig. 2 is a cross section of a schematical arrangement of another variant of an example of embodiment in which the yarn formation from the singled out fibres goes in the spinning rotor on the yarn-forming surface having the shape of a curve
• Fig. 3 is a detail of a section of the spinning rotor in which the yarn-forming surface is made outside the collecting surface of the rotor by surfaces with various apex angles
• Fig. 1 is a cross section of a schematical arrangement of a device suitable in particular for very high rotation speed in which the process of yarn forming goes in the spinning rotor in the direction identical with its delivery from the spinning rotor
• Fig. 2 is a cross section of a schematical arrangement of another variant of an example of embodiment in which the yarn formation from the singled out fibres goes
• Fig. 4 is a detail of a section of a spinning rotor in which the yarn-forming surface consists of a surface adjoining the delivered yarn deflected by a draw-off trumpet, and Fig. 5 shows the process of transformation across the by the twist not reinforced fibre band section.
• a spinning rotor 1 rotatably mounted in a well-known way, comprises a slide surface 2 into which leads an inlet channel 3 of singled out fibres 4 whose outlet opening is situated opposite the slide surface 2 of the rotor I.
• the inlet channel 3 is connected with a well known, not shown singling out device.
• the slide surface 2 widens at least from the area of the entry of the fibres 4, in the shown example of embodiment conically, and its widest section continues by a collecting surface 5 serving to collect the singled out fibres 4 into a fibre band 6.
• the yarn-forming surface 7 of the spinning rotor 1 consists of a narrowing conical surface whose apex angle is inferior to 60°.
• the terminal area of the yarn-forming surface 7 is equipped with vents 8 intended to produce underpressure in the rotor 1.
• the underpressure in the rotor I can be generated also by other well known means permitting to omit the vents 8 in the rotor I.
• a draw-off trumpet 9 of yarn 10 is mounted in a well known manner axially adjustably.
• the distance between the inlet opening of the draw-off trumpet 9 and radial plane passing through the collecting surface 5 is superior to the radius of the collecting surface 5.
• the narrowing yarn-forming surface 7 of the rotor I is made so as to intersect behind the by the twist not reinforced fibre band section 61 the imaginary path H of the balloon that would be generated by the rotation of the yarn _10 delivered from the collecting surface 5 to the draw-off trumpet 9 as a consequence of the centrifugal force.
• the yarn-forming surface 7 can have in the section passing through the axis of the spinning rotor 1 the shape of a curve or of a sharp taper, or also, it can be a composition of a number of conical surfaces with various apex angles or made of further combinations of these variants.
• the inlet channel 3 of the fibres 4 leads into the rotor 1 in a well known manner outside its rotation axis and onto the widening slide surface 2 of the spinning rotor 1.
• the slide surface 2 passes through its edge 21 into a collecting groove 12 in which, and more specifically in the area where its diameter is greatest, is provided the collecting surface 5 for collecting the fibre bands 6.
• the shape of the collecting groove 12 shapes the section of the fibre band 6 suitably for the formation of the yarn 10, and the edge 21 defines the dividing line between the slide of single, singled out fibres 4 and the fibre band 6.
• the inlet channel 3 of the fibres 4 leads into the rotor 1 in a well known manner outside its rotation axis and onto the widening slide surface 2 of the spinning rotor 1
• the shape of the collecting groove 12 shapes the section of the fibre band 6 suitably for the formation of the yarn 10, and the edge 21 defines the dividing line between the slide of single, singled out fibres 4 and the fibre band 6.
• the collecting groove 12 is followed by a narrowing yarn-forming surface 7 whose end is followed by the bottom 13 of the spinning rotor 1 with the vents 8 for generating underpressure in the rotor 1; however, the vents 8 may be omitted if there are provided other means for generating underpressure.
• the body of the draw-off trumpet carries a deflector 14 whose friction area 141 reaches as far as the bottom 13 of the spinning rotor 1.
• the deflector 14 can be made as a separate body which, as well as the draw-off trumpet 9, can be axially adjustable with respect to the rotor 1.
• the deflector 14 can be so coupled with the draw-off trumpet 9 as to positively share its motion.
• the draw-off trumpet 9 with its friction area 91 can fulfil also the function of the deflector 14.
• the yarn 10 can then be deflected directly by the friction area 91 of the draw-off trumpet 9 or, especially with long-staple materials and large-diameter rotors 1, both by the friction area 141 of the deflector 14 end by the friction area 91 of the draw-off trumpet 9.
• the rotary surface acting as the yarn-forming surface of the spinning rotor 1 must in a circle intersect the auxiliary conical surface 15 which is the tangent of the collecting surface 5 and the friction area 141 of the deflector 14 or the friction area 91 of the draw-off trumpet 9, or also, the rotary surface of the yarn forming surface 7_must be intersected by the path H of the balloon that would be created by a freely rotating deflected yarn 10 between the collecting surface 5 and the friction area 91 of the draw-off trumpet 9 or the friction area 141 of the deflector 14.
• the most important thing is to create the by the twist not reinforced section 61 of the fibre band 6 by deflecting the yarn 10 behind the radial plane passing through the collecting surface 5 by means of the friction area 141 of the deflector 14 or the friction area 91 of the draw-off trumpet 9.
• the fibre band 6 being transformed into the yarn 10 passes on the yarn-forming surface 7 of the spinning rotor 1, and the friction on this yarn-forming surface 7 of the rotor 1_prevents the full twist from infiltrating the by the twist not reinforced section 61 of the fibre band 6 in which as a consequence of this the fibres of the fibre band 6 receive both uniform tension (stretching) and perfect parallelism before the fibre band 6 is transformed into yarn 10.
• the yarn-forming surface 7 can assume various shapes differing, for instance, according to the character and staple length of the processed materials, rotation speed of the spinning rotor, etc.
• the axial section of the yarn-forming surface 7_ is a curve.
• the yarn-forming surface 7 consists of two conical surfaces with different apex angles.
• the yarn-forming surface 7 is made as the surface of a sharp taper adjacent to the supplied yarn 10.
• the supplied sliver is singled out into separate fibres 4 fed through the inlet channel 3 into the spinning rotor 1 in which underpressure is generated, for instance by the rotation of the vents 8 or in another known way.
• the singled-out fibres 4 are sucked onto the rotating slide surface 2 where they are, also due to the action of the centrifugal forces, straightened and oved to the collecting surface 5 on which they are collected into the fibre band 6_fixed to the collecting surface 5 by the centrifugal force.
• the dividing line between the slide of the singled-out fibres 4 and the collecting of the singled-out fibres 4 into the fibre band 6 is provided for by the edge 21 between the slide surface 2 and the collecting groove 12 whose greatest diameter serves as the collecting surface 5 which can be in another embodiment attached directly to the slide surface 2, as is shown in Fig. 4.
• the fibre band 6 produced on the collecting surface 5_in the collecting groove 12 is displaced from the collecting surface 5 on the yarn-forming surface 7 of the spinning rotor 1 onto which it is pressed by the pressure component 172 of the centrifugal force 17 while the stretching component 171 of the centrifugal force 17 at the same time stretches it against the action of the delivery (draw-off) force in the yarn 10 being produced from the fibre band 6 on the yarn- forming surface 7 at the end of the deflected, by the twist not reinforced section 61 of the fibre band 6.
• the stretching component 171 of the centrifugal force 17 acts in the direction of the tangent to the yarn-forming surface at that point while the pressure component 172 acts transversely to the yarn-forming surface 7, e.g., at right angles with the stretching component 171.
• the by the twist not reinforced section 61 of the fibre band 6 is that part of the fibre band 6 that is infiltrated by the partial twist of the yarn 10 in process of twisting and that is situated between the fibre band 6 arising on the collecting surface 5 of the spinning rotor 1 and the yarn 10 being produced by twisting from the fibre band 6.
• the effect of the fibre band 6 displacing outside the yarn-forming surface 7 consists in that the singled-out fibres, continuously supplied via the slide surface 2 onto the collecting surface 5, are either caught by the twist arising on the fibre band 6 being displaced, or they are laid onto the collecting surface 5.
• the singled-out fibres 4 are added to the surface of the fibre band 6 being displaced they receive in the next by the twist not reinforced section 61 of the fibre band 6 both uniform stretching and parallelism with the other fibres 4 of the fibre band 6 due to the action of the stretching component 171 of the centrifugal force 17.
• the axial tension in the by the twist not reinforced section 61 of the fibre band 6 produces its limited draft compensating the haphazard, not uniform bend of the fibres 4_in the fibre band 6 and, since the stretching component 171 of the centrifugal force 17 produces axial tension also at the end of the by the twist not reinforced section 61 of the fibre band 6, infiltrated by the twist and the fibre band 6_is transformed by twisting into the yarn 10.
• the fibre band 6 twisting goes in presence of the axial tension acting in the by the twist not reinforced section 6 . of the fibre band 6, like in the known ring spinning machines. This fact favourably influences the resulting quality of the produced yarn 10 by increasing its strength and improving the quality of its surface.
• the by the twist not reinforced section 61 is shorter than the average staple length of the singled-out fibres 4_to be spun so that the axial tension in the by the twist not reinforced section 61 cannot break the fibre band 6.
• the yarn 10 In the to the yarn 10 connected, by the twist not reinforced section 61 of the fibre band 6, they receive tension due to the delivery (draw-off) acting aginst the stretching component 171 of the centrifugal force 17 and acting in the longitudinal axis of the fibre band 6 and, consequently, uniform stretching of the singled out fibres 4 in the cross section of said fibre band 6 prior to its transformation into the yarn 10 by means of the full twist. Since the yarn 10 is produced with the fibres 4 of the fibre band 6 stretched analogically as in the classical ring spinning, its resulting quality is increased accordingly. The yarn 10 thus produced is then delivered in the direction 16 from the rotor 1 by means of the draw-off trumpet 9 and is in usual way wound on a not shown cone.
• the fibre band 6 moves from the collecting surface 5 onto the yarn-forming surface 7 due to the centrifugal force 17; without said yarn-forming surface 7, the rotating yam 10 would create a balloon between the draw-off trumpet 9 and the collecting surface 5.
• the process of the yarn formation begins on the yam-forming surface 7 at the end of the by the twist not reinforced section 61 of the fibre band 6, i. e., in the area where the pressure component 172 of the centrifugal force 17 does not prevent the full twist from infiltrating the by the twist not reinforced section 61 of the fibre band 6.
• the fibre band 6 is posivitely moved from the collecting surface 5 to the yam-forming surface 7_due to the fact that the yarn 10 being produced is led along the friction area 141 of the deflector 14 or along the friction area 91 of the draw-off trumpet 9, both of them situated in the inner space of the spinning rotor 1.
• the length of the by the twist not reinforced section 61 of the fibre band 6 can be adapted to the staple length of the fibres to be spun.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Spinning Or Twisting Of Yarns (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=5463592

Family Applications (1)

Country Status (2)

Citations (3)

• 1993
  • 1993-08-11 CZ CZ931644A patent/CZ280689B6/cs not_active IP Right Cessation
• 1994
  • 1994-08-03 WO PCT/CZ1994/000019 patent/WO1995004849A1/en active Application Filing

Patent Citations (3)

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