EP3464691B1 - Garnbildungselement für eine vorspinnmaschine sowie damit ausgerüstete vorspinnmaschine - Google Patents

Garnbildungselement für eine vorspinnmaschine sowie damit ausgerüstete vorspinnmaschine Download PDF

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Publication number
EP3464691B1
EP3464691B1 EP17723523.1A EP17723523A EP3464691B1 EP 3464691 B1 EP3464691 B1 EP 3464691B1 EP 17723523 A EP17723523 A EP 17723523A EP 3464691 B1 EP3464691 B1 EP 3464691B1
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EP
European Patent Office
Prior art keywords
yarn
forming element
truncated cone
roving
fiber structure
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.)
Active
Application number
EP17723523.1A
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German (de)
English (en)
French (fr)
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EP3464691A1 (de
Inventor
Petr Haska
Christian Griesshammer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschinenfabrik Rieter AG
Original Assignee
Maschinenfabrik Rieter AG
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Publication of EP3464691A1 publication Critical patent/EP3464691A1/de
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
    • D01H1/11—Spinning by false-twisting
    • D01H1/115—Spinning by false-twisting using pneumatic means
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/70—Constructional features of drafting elements
    • D01H5/72—Fibre-condensing guides
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H7/00—Spinning or twisting arrangements
    • D01H7/92—Spinning or twisting arrangements for imparting transient twist, i.e. false twist

Definitions

  • the present invention relates to a yarn-forming element for a roving machine, with which roving can be produced from a fiber structure with the aid of compressed air, the yarn-forming element comprising an inlet opening for the fibers of the fiber structure, and the yarn-forming element having an outlet for the outlet of the roving machine during operation the fiber structure in the region of the inlet opening of the yarn formation element and has a discharge channel connecting the inlet opening and the outlet.
  • a roving machine for producing a roving from a fiber structure with at least one spinning station having a whirlpool chamber with an inlet opening for the fiber structure and a yarn-forming element extending at least partially into the whirlpool chamber, and the spinning station having air nozzles directed into the whirlpool chamber via which air can be introduced into the vortex chamber in a predetermined direction of rotation in order to impart a rotation in said direction of rotation to the fiber structure fed via the inlet opening in the region of an inlet opening of the yarn-forming element.
  • Roving machines with corresponding spinning positions are known in the prior art and are used to produce a roving from an elongated fiber structure.
  • the outer fibers of the fiber structure are wound around the inner core fibers with the help of a turbulent air flow generated by the air nozzles inside the turbulence chamber in the area of the inlet opening of the yarn-forming element and thus form the core fibers that are decisive for the desired strength of the yarn.
  • B. can be wound onto a sleeve.
  • a spinning position of an air jet spinning machine for spinning a fiber structure to produce a yarn is known.
  • the spinning position points a pair of delivery rollers and a spinneret, the spinneret having a yarn-forming element and a fiber-guiding element.
  • the fiber guide element has a beginning facing the pair of delivery rollers and an end facing away from the pair of delivery rollers.
  • the fiber structure is fed to the spinneret with the pair of delivery rollers and introduced into the spinneret through the fiber guide element, and then a yarn is formed from the fiber structure by the yarn-forming element.
  • the spinning station has a turbulence chamber with an inlet opening for the fiber structure and a yarn-forming element that extends at least partially into the turbulence chamber.
  • the term roving (other designation: Lunte) to understand a fiber structure, in which at least a part of the fibers around a inner core are wound.
  • This type of yarn is characterized by the fact that, despite having a certain strength that is sufficient to transport the yarn to a subsequent textile machine, it is still capable of being drawn.
  • the roving can thus using a default device, z. B. the drafting system, a textile machine processing the roving, for example a ring spinning machine, before it is finally spun into a conventional yarn.
  • a fiber guide element is usually arranged, via which the fiber strand is guided into the spinneret and finally into the area of the yarn-forming element, with the yarn-forming elements generally being elongated structures with a internal discharge duct find use.
  • the geometry of the yarn-forming element In addition to the geometry of the vortex chamber and the strength and alignment of the individual air flows formed by the air nozzles, the geometry of the yarn-forming element also plays a decisive role in the quality of the roving.
  • the object of the present invention is therefore to propose a yarn-forming element and a roving machine equipped with it, which enables the production of a roving of particularly high quality.
  • the yarn-forming element is characterized in that it comprises an end face surrounding the inlet orifice, which at least partially has the shape of a truncated cone, with the top surface of the truncated cone being arranged between the base of the truncated cone and the outlet of the yarn-forming element.
  • the top surface of the truncated cone is understood to be the flat and circular surface of the truncated cone with the smaller radius and the base surface is understood to be the flat and circular surface of the truncated cone with the larger radius.
  • a corresponding truncated cone is shown in Figure 3a .
  • the yarn-forming element thus has an end face that is at least partially conical or funnel-shaped, with the funnel or cone or the above-mentioned truncated cone tapering in the direction of the outlet of the yarn-forming element.
  • a shape is produced, for example, by countersinking.
  • the angle between a generatrix of the truncated cone and its cone axis has a magnitude that is less than 90° and greater than 70°.
  • the cone axis is the axis of rotation of the truncated cone.
  • the generating line is a line that lies on the lateral surface of the truncated cone and is in a plane with the axis of the cone runs. Also in this context Figure 3a referenced, showing a corresponding truncated cone.
  • the end face should therefore have the shape of a relatively flat truncated cone, the height of which should be only between 2% and 20% of the diameter of the base area. If a slub of the roving reaches the area of the end face, which is thicker than the inner diameter of the discharge channel, the slub area in the area of the end face of the yarn forming element or the frustoconical section gets caught and can thus be easily removed.
  • the frustoconical area of the end face should merge directly into the discharge channel, so that the diameter or the cross-sectional shape of the discharge channel in this area corresponds to the diameter or the shape of the top surface of the truncated cone.
  • the discharge channel has a longitudinal axis and the longitudinal axis and said cone axis run parallel or collinear to one another.
  • the discharge duct is preferably rotationally symmetrical, in which case the longitudinal axis would correspond to the axis of rotation of the discharge duct.
  • the stated mutual arrangement of the longitudinal axis and cone axis ensures that a plane resting on the end face of the yarn-forming element runs perpendicular to the longitudinal axis of the discharge channel, along which the roving moves in the direction of the outlet of the yarn-forming element.
  • the discharge channel has an inner diameter in a region adjoining the inlet opening or the truncated cone, the amount of which is 4 mm to 12 mm, preferably 6 mm to 8 mm. If the specified diameter limits are observed, a particularly advantageous air flow occurs in the area of the inlet opening of the yarn-forming element, which causes only part of the outer fiber ends to be caught and wrapped around the actual fiber core with the desired strength. On the other hand, if the diameter is less than 4 mm, one gradually arrives in the range of the conventional Air spinning is known and results in a relatively strong yarn that is only partially suitable as a roving.
  • the air pressure of the air supplied via the air nozzles must be significantly increased in order to ensure the necessary turbulent flow within the turbulence chamber, since part of the incoming air leaves the turbulence chamber via the inlet opening of the yarn-forming element without going to the contribute to vortex formation.
  • a particularly advantageous roving can only be produced if the diameter deviates significantly from the values known from conventional air-jet spinning, which are between 0.5 and a maximum of 2.0 mm the centrally arranged core fibers are looped (thus providing the roving with a protective twist), with the proportion and strength of the wrapping fibers being only so high that the desired drafting of the roving is still possible in the course of the subsequent spinning process on a subsequent spinning machine.
  • the yarn-forming element has a cylindrical wall with a cylindrical outer surface and a cylindrical inner surface delimiting the discharge channel in the area of the inlet opening, the inner surface and the outer surface running concentrically.
  • the yarn-forming element therefore has at least one cylindrical section with a constant wall thickness in the area adjoining the end face.
  • the entire end face of the yarn-forming element which connects the outer surface and the inner surface, has the shape of a truncated cone.
  • the section of the yarn-forming element that has the inlet opening thus preferably has three surface sections, namely a surface section formed by the outer surface of the yarn-forming element, a surface section formed by the inner surface adjoining the inlet opening (and at least partially delimiting the discharge channel), and a surface section formed by the end face. which has the shape of a truncated cone.
  • the transition area between the end face and the discharge channel and/or the transition between the end face and an outer surface of the yarn-forming element is not sharp-edged, but rounded.
  • the radius of the rounded portions which should have a ring shape in a plan view of the end face of the yarn-forming element, should be between 0.1 mm and 2.0 mm.
  • the yarn-forming element has a chamfer in the area of the end face, which also has the shape of a truncated cone.
  • the bevel should preferably merge into the outer surface of the yarn-forming element and be spaced apart from the discharge channel by a frustoconical area on the end face of the yarn-forming element.
  • the base of the truncated cone forming the bevel is arranged between the top surface of this truncated cone and the outlet of the yarn-forming element.
  • the chamfer should thus form a truncated cone which is inverted with respect to the truncated cone described in claim 1.
  • the base of the truncated cone adjoining the discharge channel corresponds to the top surface of the truncated cone formed by the chamfer.
  • the two truncated cones therefore advantageously merge directly into one another.
  • the bevel encloses an angle ⁇ with a longitudinal axis of the discharge channel, the amount of which is between 20° and 70°, preferably between 30° and 60°. Furthermore, in a longitudinal section of the yarn-forming element, the bevel should enclose an angle of between 70° and 90° with the further frustoconical region mentioned in claim 1. If the chamfer is arranged between the discharge channel and the further area of the end face of the yarn-forming element, which forms a truncated cone, the stated angle should be greater than 140° and smaller than 180°.
  • the end face has at least one second frustoconical region in addition to a first frustoconical region, the second frusto-conical region surrounding the first frusto-conical region in a plan view of the end face of the yarn-forming element.
  • the cylindrical end of the yarn-forming element which also includes the inlet opening, is first machined with a countersink in such a way that the area mentioned in claim 1, which has the shape of a truncated cone, is created and then the transition area is provided with an annular chamfer between the face of the yarn-forming element and the outer surface of the yarn-forming element.
  • the second frustoconical area directly adjoins the first frustoconical area, with both frustoconical areas preferably running concentrically to one another. It is conceivable in this context that the base of the first frustoconical area forms the top surface of the second frustoconical area. Furthermore, it is advantageous if the diameter of the top surface of the first frustoconical area is smaller than the top surface of the second frustoconical area.
  • the smallest angle between a generatrix of the first frustoconical area and a longitudinal axis of the discharge channel has a different, preferably smaller, amount (e.g. 50° to 80°) than the smallest angle between a generatrix of the second frustoconical region and said longitudinal axis of the flue (which should be greater than 70° and less than 90°).
  • the yarn-forming element according to the invention is characterized in that at least a part, e.g. B. an annular region of an end face of the yarn-forming element, preferably the entire end face thereof, is inclined inwardly in the direction of the discharge channel in a longitudinal section of the yarn-forming element.
  • the present invention relates to a roving machine for producing a roving from a fiber structure with at least one spinning station, the spinning station having a turbulence chamber with an inlet opening for the fiber structure and a yarn forming element extending at least partially into the vortex chamber.
  • the spinning station also includes air nozzles directed into the whirl chamber, via which air can be introduced into the whirl chamber in a predetermined direction of rotation, in order to impart a rotation in said direction of rotation to the fiber structure fed via the inlet opening in the region of an inlet opening of the yarn-forming element.
  • the yarn-forming element has an outlet for the outlet of the roving and a discharge channel connecting the inlet opening and the outlet, through which the roving passes before exiting via the outlet.
  • the yarn-forming element is designed according to the previous or following description, with the individual features being able to be implemented in any combination, provided that this does not result in any contradictions.
  • figure 1 shows a schematic view of a section of a roving machine.
  • the roving machine can have a drafting system with several, each around a rotary axis 23 rotatable drafting system rollers 21 (only two of the six drafting system rollers 21 are provided with a reference number), the drafting system being supplied with a fiber structure 1, for example in the form of a doubled draw frame sliver, during the spinning operation.
  • the roving frame shown comprises one or more spinning nozzles 22 arranged adjacent to one another, each with an internal turbulence chamber 15 (see FIG figure 2 ), in which the fiber structure 1 or at least some of the fibers of the fiber structure 1 is provided with a twist (the precise mode of operation of the spinneret 22 is described in more detail below).
  • the roving machine can comprise a take-off device 24 with a plurality of interacting take-off rollers 31 and a winding device 25 downstream of the take-off rollers 31, with the aid of which the spinneret 22 can be fed via an outlet 4 (which at the same time is the outlet 4 of the, for example, in figure 2 closer shown discharge channel 5 forms) leaving roving 2 can be wound onto a sleeve 32 to form a coil, in which case a traversing element 20 can be used.
  • the roving machine according to the invention does not necessarily have to have a drafting system, as is shown in figure 1 is shown.
  • the take-off rollers 31 are also not absolutely necessary.
  • the roving machine works according to an air spinning process.
  • the fiber strand 1 is guided into the turbulence chamber 15 of the spinneret 22 via an inlet opening 16, in which a so-called fiber guide element is preferably arranged (see also figure 2 ).
  • a so-called fiber guide element is preferably arranged (see also figure 2 ).
  • Some of the fibers are pulled out of the fiber structure 1 at least a little and wound around the tip of a yarn-forming element 17 protruding into the eddy chamber 15 .
  • the draw-off channel 5 should also have an inside diameter D, the amount of which is in the above-mentioned range.
  • the roving 2 produced is a yarn with a relatively small proportion of twisted fibers, or a yarn in which the twisted fibers are wrapped relatively loosely around the inner core, so that the Roving 2 remains draftable.
  • a subsequent textile machine e.g. a ring spinning machine
  • a drafting system in order to be able to be further processed into a conventional yarn that can be processed into a fabric, for example on a weaving machine.
  • the air nozzles 18 it should also be mentioned at this point, purely as a precaution, that they should generally be aligned in such a way that they jointly generate a rectified air flow with a uniform direction of rotation.
  • the individual air nozzles 18 are preferably arranged rotationally symmetrically to one another.
  • the inclination of the air nozzles 18 in relation to the longitudinal axis L of the discharge channel 5 can be selected within certain limits.
  • the air nozzles 18 could run perpendicular to the longitudinal axis L mentioned (see in figure 2 air nozzle 18 shown on the left).
  • the yarn-forming element 17 is characterized in that said end face, which is part of the wall 30 of the yarn-forming element 17, is inclined slightly inward.
  • the yarn-forming element 17 comprises an end face 6 surrounding the inlet opening 3, which has the shape of a truncated cone 27 at least in sections, with the top surface 7 of the truncated cone 27 being arranged between the base 8 of the truncated cone 27 and the outlet 4 of the yarn-forming element 17.
  • the top surface 7 is the circular surface with the smaller radius and the base surface 8 is the circular surface with the larger radius.
  • the lateral surface 29 is the surface that connects the base surface 8 to the top surface 7 .
  • the generatrices 28 are the lines that lie on the lateral surface 29 and run in a plane with the cone axis K, which in turn represents the axis of rotation of the truncated cone 27 .
  • the yarn-forming element 17 according to the invention has an end face 6 which, at least in sections, has the above-mentioned truncated cone shape, with the Figure 3b Angle ⁇ shown between the longitudinal axis L of the discharge channel 5 and any surface line 28 of the truncated cone 27 has an amount that is greater than 70 ° and less than 90 °. Said area thus forms a relatively flat cone, which also has only a slight funnel effect.
  • the frustoconical area preferably forms the entire end face 6 of the Yarn-forming element 17, which surrounds the inlet opening 3 and which connects the inner surface 19 of the yarn-forming element 17, which delimits the discharge channel 5, and an outer surface 10 of the same, which preferably runs concentrically with said inner surface 19 (at least in a first area adjoining the end face 6).
  • a corresponding version is in Figure 3b shown.
  • transition 11 between the end face 6 of the yarn-forming element 17 and the aforementioned outer surface 10 of the same is rounded ( Figures 4a and 4b ).
  • transition area 9 between the end face 6 of the yarn-forming element 17 and the discharge channel 5 can also be rounded ( Figure 4b ).
  • the Figures 5a and 5b show solutions in which the end face 6 of the yarn-forming element 17 comprises, in addition to the area mentioned having the shape of a truncated cone 27 , a further area which also has the shape of a truncated cone 27 .
  • the end face 6 therefore preferably comprises a first frustoconical area 13 and a second frustoconical area 14.
  • the angle ⁇ between a surface line 28 of the first frustoconical area 13 and the longitudinal axis L of the discharge channel 5 is greater than the angle ⁇ between a surface line 28 of the second frustoconical area 14 and the longitudinal axis L of the discharge channel 5 ( Figure 5b ).
  • the opposite design can also be advantageous, as shown in Figure 5a is shown.
  • the Figures 6a and 6b show that the end face 6 of the yarn-forming element 17 can also be partially formed by a chamfer 12, the angle ⁇ between a surface line 28 of the truncated cone 27, which is described by the chamfer 12, and the longitudinal axis L of the discharge channel 5 preferably in the already in the range mentioned in the general description.
  • the chamfer 12 forms the second frustoconical region 14 described above.
  • the shape of the outer surface 10 of the yarn-forming element 17 and/or the shape of the inner surface 19 of the yarn-forming element 17 may deviate from the shape of a cylinder and/or have gradations.
  • FIG 8 A detail of a cross section through another spinneret 22.
  • the spinneret 22 also includes one or more piecing air nozzles 33, via which (likewise) Compressed air can be introduced into the vortex chamber 15.
  • the spinning nozzle 22 has special piecing air nozzles 33 which are fed with compressed air exclusively or together with the air nozzles 18 during a piecing process.
  • the piecing process is the initial sequence of roving production, in which the fiber structure 1 is introduced into the previously empty eddy chamber 15 and twisted there to form a roving 2 .
  • the roving section thus formed is taken over by a corresponding take-off device 24 after leaving the take-off channel 5 and is brought into contact with a rotating sleeve 32 while the supply and twisting of the fiber structure 1 continues.
  • This is followed by normal operation of the spinneret 22 , in which further roving 2 is continuously produced from the supplied fiber structure 1 and drawn off from the spinneret 22 .
  • the piecing air nozzles 33 should be inclined relative to the longitudinal axis L of the offtake duct 5 in order to be able to generate an air flow that extends at least a little way into the offtake duct 5 (the angle between the longitudinal axis L and a central axis of the piecing air nozzles 33 or their direction vectors should therefore deviate from 90°). This ultimately prevents air from flowing through the discharge channel 5 in the direction of its inlet opening 3 counter to the direction of movement of the roving 2 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
EP17723523.1A 2016-05-26 2017-05-04 Garnbildungselement für eine vorspinnmaschine sowie damit ausgerüstete vorspinnmaschine Active EP3464691B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH00675/16A CH712489A1 (de) 2016-05-26 2016-05-26 Garnbildungselement für eine Vorspinnmaschine sowie damit ausgerüstete Vorspinnmaschine.
PCT/IB2017/052586 WO2017203376A1 (de) 2016-05-26 2017-05-04 Garnbildungselement für eine vorspinnmaschine sowie damit ausgerüstete vorspinnmaschine

Publications (2)

Publication Number Publication Date
EP3464691A1 EP3464691A1 (de) 2019-04-10
EP3464691B1 true EP3464691B1 (de) 2023-05-03

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EP17723523.1A Active EP3464691B1 (de) 2016-05-26 2017-05-04 Garnbildungselement für eine vorspinnmaschine sowie damit ausgerüstete vorspinnmaschine

Country Status (6)

Country Link
US (1) US10900144B2 (zh)
EP (1) EP3464691B1 (zh)
JP (1) JP6972025B2 (zh)
CN (1) CN109154110B (zh)
CH (1) CH712489A1 (zh)
WO (1) WO2017203376A1 (zh)

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Publication number Priority date Publication date Assignee Title
CH712663A1 (de) * 2016-07-14 2018-01-15 Rieter Ag Maschf Verfahren zum Verarbeiten eines strangförmigen Faserverbands sowie Vorspinnmaschine.
DE102020108257A1 (de) * 2020-03-25 2021-09-30 Saurer Spinning Solutions Gmbh & Co. Kg Vorrichtung zur Faservereinzelung und Spinneinrichtung umfassend eine solche Vorrichtung

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DE102012108613A1 (de) * 2012-09-14 2014-03-20 Maschinenfabrik Rieter Ag Spinnstelle einer Vorspinnmaschine

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Publication number Publication date
CH712489A1 (de) 2017-11-30
JP6972025B2 (ja) 2021-11-24
US20190323151A1 (en) 2019-10-24
CN109154110B (zh) 2021-06-18
US10900144B2 (en) 2021-01-26
WO2017203376A1 (de) 2017-11-30
CN109154110A (zh) 2019-01-04
JP2019519690A (ja) 2019-07-11
EP3464691A1 (de) 2019-04-10

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