EP1713963A2 - Méthode pour obtenir une partie de fil rattachée de masse constante dans un procédé de filage à vortex - Google Patents

Méthode pour obtenir une partie de fil rattachée de masse constante dans un procédé de filage à vortex

Info

Publication number
EP1713963A2
EP1713963A2 EP05700340A EP05700340A EP1713963A2 EP 1713963 A2 EP1713963 A2 EP 1713963A2 EP 05700340 A EP05700340 A EP 05700340A EP 05700340 A EP05700340 A EP 05700340A EP 1713963 A2 EP1713963 A2 EP 1713963A2
Authority
EP
European Patent Office
Prior art keywords
rollers
drafting system
pair
drafting
rear pair
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.)
Withdrawn
Application number
EP05700340A
Other languages
German (de)
English (en)
Inventor
Horst Wolf
Michael Bergmann
Oliver Straub
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Maschinenfabrik Rieter AG filed Critical Maschinenfabrik Rieter AG
Priority to EP05700340A priority Critical patent/EP1713963A2/fr
Publication of EP1713963A2 publication Critical patent/EP1713963A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • D01H1/14—Details
    • D01H1/20—Driving or stopping arrangements
    • D01H1/22—Driving or stopping arrangements for rollers of drafting machines; Roller speed control
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H15/00—Piecing arrangements ; Automatic end-finding, e.g. by suction and reverse package rotation; Devices for temporarily storing yarn during piecing
    • D01H15/002—Piecing arrangements ; Automatic end-finding, e.g. by suction and reverse package rotation; Devices for temporarily storing yarn during piecing for false-twisting spinning machines
    • 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
    • D01H4/42—Control of driving or stopping

Definitions

  • the present invention relates to a method for starting up a drafting system according to the preamble of independent patent claims 1 and 3, as well as a control for drafting systems of a textile machine according to the preamble of patent claim 11, and a textile machine with said control according to patent claim 12.
  • the known methods for starting up a drafting system have disadvantages. This applies in particular to drafting systems which belong to air spinning machines or to drafting systems which forward the warped fiber structure to a spinning unit which operate using an air spinning process.
  • a disadvantage of the known methods for starting up a drafting system is that the piecing quality is not always satisfactory.
  • the piecing means a “seam” within a yarn at which the yarn was “attached” or “attached” again, for example after a production interruption.
  • a piecing is usually produced by adding fibers to or around an existing yarn end The piecer represents an actual overlap area between a yarn end and additionally spun new fibers on it. Often it thus represents a thick spot which is actually undesirable.
  • a piecer or a piecing point should not differ from the rest of the yarn, this applies in particular with regard to strength and fiber mass.
  • various possibilities are disclosed in the above-mentioned documents.
  • the fiber end, on which should be applied, tapered and / or the drafting system delivers fewer fibers in the overlap area than in the subsequent stationary operating state. Notwithstanding, there is still another problem with the known devices, which the present invention now intends to solve.
  • the present invention is therefore based on the object of providing a method for starting up a drafting system for drawing a fiber structure with which mass fluctuations in the piecer are avoided or minimized. It can also be considered a task to create a method for commissioning a drafting system in which a fiber structure is to be warped with the correct draft ratio from the start.
  • FIG. 1 shows a typical drafting device 1 to which the method according to the invention can be used.
  • the drafting system 1 has a front pair of rollers 3 and a rear pair of rollers 4 which have a clamping line 5.
  • the drafting system 1 can have a further pair of rollers 7.
  • the drafting system 1 serves to warp the fiber structure 2.
  • the roller pairs 3 and 4 rotate at different speeds or peripheral speeds.
  • the front pair of rollers 3 and the rear pair of rollers 4 thus form the so-called main drafting zone 8 of the drafting unit 1.
  • a draft can also take place (so-called pre-drafting).
  • a drafting system as shown in FIG.
  • the fiber structure 2 passes through the roller pair 7 (if present) and above all the roller pairs 3 and 4.
  • the fiber structure 2 is warped and leaves the drafting device 1 at or after the clamping line 5 of the rear roller pair 4.
  • the warped The fiber structure is then usually further processed immediately (for example on a spinning unit, see the following FIG. 4). If for some reason there is an interruption in production or if the drafting system 1 generally has to be put into operation again, the fiber structure 2 must be reinserted into the drafting system 1 or at least correctly positioned.
  • the position of the fiber dressing end 6 therefore plays a particularly important role.
  • the drafting system 1 has the additional pair of rollers 7 or even a further pair of rollers. It is normally the case that in the event of an interruption in production, the roller pairs of the drafting system 1 are stopped in an order that the fiber structure 2 is torn off at the clamping line 5.
  • the front pair of rollers 3 is parked in front of the rear pair of rollers 4.
  • the fiber assembly end 6 is located directly in front of the clamping line 5. See, for example, the aforementioned EP 137 57 09.
  • the rear pair of rollers 4 generally begins to rotate before the front pair of rollers 3 in turn starts operating again. It may well be that the period between the start-up of the rear pair of rollers 4 and the front pair of rollers 3 is long enough for the transient process from the acceleration to end in the course of the speed of the pair of rollers 4 before the front pair of rollers 3 is set in motion becomes. However, since the sliver end 6 is located directly in front of the clamping line 5 of the rear pair of rollers 4, the fiber assembly 2 warps immediately after the front pair of rollers 3 has been started up.
  • the front pair of rollers 3 still has to accelerate to the piecing speed or operating speed after it has been started up, it also settles to the desired piecing speed here.
  • the area of the fiber structure 2 immediately following at the sliver end 6 is warped and thus exhibits undesirable fluctuations in mass. If this “initial area” of the fiber structure 2 is used to generate a piecing, then of course this piecing also has undesirable mass fluctuations.
  • FIG. 2 The figure shows, inter alia, the speed curve U 4 (t) of the rear roller pair 4 and the speed curve U 3 (t) of the front roller pair 3.
  • the rear roller pair 4 is put into operation.
  • said roller pair 4 accelerates for a period t ⁇ , 4 until roller pair 4 has reached the application speed UA, 4 (ZB ⁇ 5 mm / msec).
  • the acceleration of the rollers is very high, since the yarn end 10 is otherwise unbearably long must be chosen. The startup therefore takes place in a few milliseconds.
  • the end of the fiber structure (that is, the foremost tip of the fiber structure) is only fed to the clamping line of the second pair of rollers when both pairs of rollers perform their corresponding settling processes of acceleration have ended.
  • This point in time is denoted by t ⁇ v ⁇ in FIG. 2: at this point in time both pairs of rollers have reached a constant setting speed (as shown in the figure) or they have at least ended the settling process.
  • the warping of the fiber structure is started again at the earliest at time t ⁇ v ⁇ or, in other words, at the earliest at time t ⁇ v ⁇ the fiber structure end may enter the clamping line of the rear second pair of rollers and thus be warped.
  • the start-up of the drafting system also includes a piecing process with a yarn end in addition to this coordinated delay, the time for the beginning of the piecing process t ⁇ ⁇ must not be before the time t E v ⁇ .
  • the time t E v ⁇ is therefore the earliest time to begin the attachment process. If a preparation process is carried out, it takes a few milliseconds (see period E, eg. ⁇ 8 msec) and is completed at a time t E.
  • the drafting system can again be operated in a stationary manner.
  • the piecing process takes place at a constant piecing speed UA, 4 or UA, 3, whereby after the piecing has taken place both roller pairs can run up to their respective operating speeds Ue, 3 and UB, 4 synchronously and more slowly, ie without overshoots.
  • the application takes place at operating speed, so that the application speeds U A , 3 and UA already represent the operating numbers for the stationary operation of the drafting system.
  • the synchronous raising of the rolls to an operating speed different from the preparation speed is shown in dashed lines in FIG.
  • FIG. 3 shows a drafting system on which an attachment process is to be carried out, the method according to the invention being used for its commissioning.
  • an existing yarn end 10 is first drawn through the spinning unit 12 against the actual spinning direction, which is arranged after the drafting system.
  • the yarn end 10 is also passed through the clamping line 5 of the rear pair of rollers 4 and - cut to a certain length - positioned accordingly for commissioning.
  • the rear pair of rollers 4 begins to rotate first. Only then is the front pair of rollers 3 put into operation. It is also possible that both pairs of rollers are put into operation simultaneously (corresponds to a possible variant of the method according to the invention).
  • the sliver end 6 is brought, as shown, at a certain distance from the clamping line 5 of the rear pair of rollers 4. This distance is at least so large that when the sliver end 6 is the Clamping line 5 reached, both roller pairs 3 and 4 have completed the transient process from the acceleration in the course of the speed.
  • parts of the yarn end 10 and the front region of the fiber structure 2 shown overlap. This overlap region is spun in the subsequent spinning unit 12 to form the actual piecing machine.
  • FIG. 4 shows a drafting system which was put into operation with the method according to the invention and its subsequent spinning unit 12.
  • the figure shows the drafting system 1 and the spinning unit 12 in the stationary operating state.
  • the individual elements correspond to the preceding figures and are provided with the same reference numerals.
  • the rollers 16 of the rear pair of rollers 4 deliver the warped fiber structure 11 of the spinning unit 12.
  • the spinning unit 12 can spin the warped fiber structure 11 according to various spinning processes.
  • a spinning unit 12 is shown, which works according to an air spinning process (so-called vortex air spinning process).
  • the spinning unit 12 has a swirl chamber 14 and a spindle 15 contained therein.
  • the spindle 15 is, strictly speaking, a preferably non-rotating spinneret.
  • the drafting system 1 also has the pair of rollers 7, which forms a pre-drafting field 9 with the pair of rollers 3. It should be explicitly pointed out again that the method according to the invention for starting up a drafting system is not restricted to a specific spinning method, such as the air spinning method shown here, nor to the presence of the further pair of rollers 7.
  • FIG. 5 shows a controller 19 according to the invention, which puts the drafting system 1 into operation according to the method according to the invention.
  • the rear pair of rollers 4 has its own drive 18, as does the front pair of rollers 3, which has the drive 17.
  • the drafting system 1 still consists as shown here a further pair of rollers 7, which forms a forward draft field with the pair of rollers 3, the pair of rollers 7 can also be driven by the drive 17 of the pair of rollers 3 (or have an additional drive of their own).
  • the controller 19 according to the invention controls the drives 17 and 18 when the drafting system is started up in accordance with the method according to the invention.
  • the controller 19 can be connected to corresponding further control and control devices of a textile machine (entire textile machine not shown).
  • the method according to the invention can also include that the fiber sliver end 6 is moved back from the clamping line 5 of the rear pair of rollers 4 before the drafting system is started up. This can also be done automatically, for example with the control 19 and the drive 17. This applies in particular if the fiber sliver end 6 is not severed by hand at a predetermined distance from the clamping line 5 of the rear pair of rollers 4. This is particularly desirable in the case of fully automatic attachment methods and devices in which the drafting system is first switched off in such a way that the fiber structure 2 leaves the clamping line 5 of the rear pair of rollers 4. This creates a clearly defined sliver end 6, which only has to be positioned accordingly before the drafting system can be put into operation again.

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)

Abstract

L'invention concerne un procédé pour la mise en fonctionnement d'un banc d'étirage (1) servant à étirer un assemblage fibreux (2). Le banc d'étirage (1) comprend au moins une paire de cylindres (3) avant et une paire de cylindres arrière (4) dotée d'une ligne de pincement (5), un bout (6) d'assemblage fibreux étant fourni pour la mise en fonctionnement du banc d'étirage (1). Selon l'invention, lors de la mise en fonctionnement du banc d'étirage (1), le bout (6) d'assemblage fibreux ne pénètre dans la ligne de pincement (5) de la paire de cylindres arrière (4) que lorsque le processus transitoire dérivé de l'accélération est terminé dans la caractéristique de vitesse de la paire de cylindres (3) avant et dans la caractéristique de vitesse de la paire de cylindres arrière (4).
EP05700340A 2004-02-10 2005-01-28 Méthode pour obtenir une partie de fil rattachée de masse constante dans un procédé de filage à vortex Withdrawn EP1713963A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05700340A EP1713963A2 (fr) 2004-02-10 2005-01-28 Méthode pour obtenir une partie de fil rattachée de masse constante dans un procédé de filage à vortex

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP04002942A EP1564317A1 (fr) 2004-02-10 2004-02-10 Méthode pour obtenir une partie de fil rattachée de masse constante dans un procédé de filage à vortex
EP05700340A EP1713963A2 (fr) 2004-02-10 2005-01-28 Méthode pour obtenir une partie de fil rattachée de masse constante dans un procédé de filage à vortex
PCT/CH2005/000045 WO2005075721A2 (fr) 2004-02-10 2005-01-28 Masse de mise en place constante dans un procede de filature a jet d'air et vortex

Publications (1)

Publication Number Publication Date
EP1713963A2 true EP1713963A2 (fr) 2006-10-25

Family

ID=34684656

Family Applications (2)

Application Number Title Priority Date Filing Date
EP04002942A Withdrawn EP1564317A1 (fr) 2004-02-10 2004-02-10 Méthode pour obtenir une partie de fil rattachée de masse constante dans un procédé de filage à vortex
EP05700340A Withdrawn EP1713963A2 (fr) 2004-02-10 2005-01-28 Méthode pour obtenir une partie de fil rattachée de masse constante dans un procédé de filage à vortex

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP04002942A Withdrawn EP1564317A1 (fr) 2004-02-10 2004-02-10 Méthode pour obtenir une partie de fil rattachée de masse constante dans un procédé de filage à vortex

Country Status (5)

Country Link
US (1) US20070234522A1 (fr)
EP (2) EP1564317A1 (fr)
JP (1) JP2007522355A (fr)
CN (1) CN1918331A (fr)
WO (1) WO2005075721A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017115939A1 (de) 2017-07-14 2019-01-17 Saurer Spinning Solutions Gmbh & Co. Kg Verfahren zum Betreiben einer Luftspinnvorrichtung, Fadenleitkanal und Luftspinnmaschine umfassend einen solchen Fadenleitkanal
EP3839114A1 (fr) * 2019-12-18 2021-06-23 Saurer Intelligent Technology AG Procédé d'agencement d'une bande de fibre sur une unité de filage d'un métier à filer

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB840455A (en) * 1957-10-22 1960-07-06 British Rayon Res Ass Improvements in, or relating to the reduction of torsional oscillation in rollers
DE3413894A1 (de) * 1983-04-15 1984-10-25 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho, Kariya, Aichi Verfahren zum ansetzen eines garnendes
IL90789A0 (en) * 1988-08-05 1990-01-18 Rieter Ag Maschf Textile machine with drawframes
KR100296977B1 (ko) * 1996-01-30 2001-11-22 무라타 기카이 가부시키가이샤 방적기의피이싱방법
TW341605B (en) * 1996-05-16 1998-10-01 Murada Kikai Kk Piecing method for a spinning machine
JP2002155435A (ja) * 2000-11-15 2002-05-31 Murata Mach Ltd 紡績機におけるピーシング方法及びその装置
EP1219737B2 (fr) * 2000-12-22 2012-01-18 Maschinenfabrik Rieter Ag Procédé pour rabouter ou mettre en place un fil crée dans une unité de filature, ladite unité étant equipée pour la mise en oeuvre du procédé
EP1375709B1 (fr) * 2002-06-21 2014-08-06 Maschinenfabrik Rieter Ag Procédé de rattache pour, ou rattachement dans, des postes de filature des métiers à filer à vortex d'air

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005075721A2 *

Also Published As

Publication number Publication date
WO2005075721A3 (fr) 2005-12-22
JP2007522355A (ja) 2007-08-09
US20070234522A1 (en) 2007-10-11
CN1918331A (zh) 2007-02-21
WO2005075721A2 (fr) 2005-08-18
EP1564317A1 (fr) 2005-08-17

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