EP0358015B1 - Train d'étirage avec une barre de pression dans une zone d'étirage préliminaire - Google Patents

Train d'étirage avec une barre de pression dans une zone d'étirage préliminaire Download PDF

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Publication number
EP0358015B1
EP0358015B1 EP89115307A EP89115307A EP0358015B1 EP 0358015 B1 EP0358015 B1 EP 0358015B1 EP 89115307 A EP89115307 A EP 89115307A EP 89115307 A EP89115307 A EP 89115307A EP 0358015 B1 EP0358015 B1 EP 0358015B1
Authority
EP
European Patent Office
Prior art keywords
drawing frame
drafting
field
break draft
zone
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
Application number
EP89115307A
Other languages
German (de)
English (en)
Other versions
EP0358015A1 (fr
Inventor
Rudolf Wehrli
Herbert Dr. Stalder
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
Publication of EP0358015A1 publication Critical patent/EP0358015A1/fr
Application granted granted Critical
Publication of EP0358015B1 publication Critical patent/EP0358015B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • D01H5/22—Drafting machines or arrangements without fallers or like pinned bars in which fibres are controlled by rollers only
    • 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
    • D01H5/26—Drafting machines or arrangements without fallers or like pinned bars in which fibres are controlled by one or more endless aprons

Definitions

  • This invention relates to a high drafting system for a flyer-less spinning process with at least one pre-drafting field and at least one main drafting field.
  • the first task is carried out by the drafting area of the drafting system, whereby a very low delay (1.1 to 1.3) is sufficient.
  • the actual warping usually takes place in the main delay field with the maximum possible delay for a single delay field (approx. 40 to sometimes 50 times).
  • a high drafting system therefore normally comprises at least one pre-drafting field and one main drafting field, i.e. at least three pairs of rollers.
  • a push rod in the aforementioned "push rod drafting system" from the company Platt Brothers belongs to this category of measures.
  • DE-PS 945 822 It is also known from DE-PS 945 822 to arrange a sliver voltage sensor in the pre-draft field and to regulate the pre-draft based on the output signal from this sensor.
  • the sensor includes a sensor that has to redirect the fiber stream in order to generate a voltage signal. The deflection caused by the sensor must be variable so that the output signal can change with the match voltage.
  • the object of the invention is to provide a high drafting system for a flyer-less spinning process which significantly improves the fiber guidance in the pre-drafting field in order to demonstrably achieve better yarn values and an increased tensile strength and elongation of the yarn to be produced.
  • the invention provides a high drafting system with at least one pre-draft field and at least one main draft field.
  • the main delay field results in a delay greater than 30 and the advance delay field results in a delay greater than 2, ie the drafting system results in a total delay of at least 60.
  • the invention is characterized in that an element for predetermined deflection of the fiber stream is arranged in the draft zone, the element not giving in under the pressure exerted by the fiber stream.
  • the pre-delay field can be one of a plurality of such fields, each field being able to be provided with a respective element for fiber deflection.
  • the element can advantageously also be designed as a fiber flow limiting means for limiting the propagation of the fiber stream in the pre-drafting field. However, since such an element does not surround the fiber stream, but rather leaves it free in at least one direction, arises this arrangement no additional problems when introducing the fuse into the drafting system.
  • the predetermined deflection of the fiber stream can be achieved in that the element is either rigidly mounted on a carrier or in such a way that the element cannot yield under the pressure exerted by the fiber stream.
  • the ratio of width to height of the fuse on the element should be selected so that as many fibers as possible are exposed to a frictional force on the element. This ratio is preferably at least 3: 1 and more preferably at least 4: 1.
  • the element is advantageously in the middle of the pre-delay field, i.e. in the middle third of the distance between the two clamping points of the advance field.
  • the drafting system can advantageously be used in a spinning machine which processes a template made of non-twisted material into a yarn.
  • the tex value of this material when imported into the drafting system can far exceed that of the ring spinning roving, e.g. are over 1000 tex.
  • the overall arrangement must have a very high delay (of more than 150), which necessitates a relatively high delay in the pre-delay field (preferably at least 4).
  • the drafting system shown in FIG. 1 is designed for a nozzle spinning machine and comprises a pair of delivery rollers LP, a pair of center rollers MP and an input roller pair EP.
  • the fiber material to be spun is drawn into the drafting system from left to right from a suitable template (not shown), drawn and conveyed by the delivery roller pair LP to a nozzle arrangement (not shown) for false twist spinning.
  • the original material has a tex of over 1000.
  • the input roller pair EP and the middle roller pair MP together form a pre-drafting zone with a distortion, preferably in the range 4-8.
  • the center roller pair MP and the delivery roller pair LP together form a main drafting zone with a distortion, preferably greater than 30 and possibly of about 40.
  • the drafting system shown is a so-called Double apron drafting system, ie the upper and lower rollers of the middle roller pair MP are each provided with an apron R which extends from the respective roller into the main drafting zone in order to improve the fiber guidance in this drafting zone.
  • this arrangement is not essential to the invention.
  • An alternative solution, which is based on a so-called kepa drafting arrangement, has been described in our EP-A-350797 and could also be used in connection with this invention.
  • a push rod D is designed in the pre-drafting field to match the input roller pair EP in order to easily redirect the fiber flow FS in this field and thereby improve the fiber guidance in this drafting field.
  • Such an improvement in the fiber guidance can be demonstrated by an improvement in the yarn values that can be achieved by the spinning station, namely by increasing the tensile strength and elongation and by reducing the CV Uster values, thin spots, thick spots and nits.
  • the improvement arises from the fact that in particular the shorter (but preferably as many) fibers on the push rod are subjected to a frictional force. These frictional forces on the push rod limit the acceleration distance in the warpage, i.e. the distance in which shorter fibers are accelerated to the higher speed of the downstream pair of rollers.
  • the fiber guide surface F of the push rod D is provided with "shoulder" S for laterally limiting the propagation of the fiber stream in the pre-draft field.
  • the area F should be formed as an area convexly rounded in the direction of the fiber flow.
  • the push rod D which serves as a deflecting element for the fiber stream, is preferably rigidly mounted on a holder, not shown.
  • the latter can be carried stationary by the frame of the drafting system.
  • the rod D could, however, be rotatable about its own longitudinal axis.
  • the position of the push rod in the pre-draft field is important for the optimal effect. It is preferably located approximately in the middle of the field (between the two clamping lines delimiting this field).
  • Figure 1 shows the push rod on the "lower" side of the fuse i.e. on the same side as the positively driven rollers.
  • the push rod could also be arranged on the other side of the fuse.
  • the necessary deflection of the fibers is very small; a deflection of approx. 1 mm in relation to the path of the fibers in the absence of the rod is sufficient to achieve the necessary friction and the associated improvements.
  • the rod is not necessarily round (cylindrical) but preferably has the already mentioned convexly rounded, fiber-guiding surface F.
  • this surface F can also have a convex shape in the transverse direction, as shown in FIG. 3.
  • This figure also shows with dashed lines the preferred design of the fuse on the push rod, namely as a relatively thin, wide layer.
  • the width of this layer is preferably in a ratio of 4: 1 or more to the layer depth.
  • Figure 1 shows two possible positions of the two rollers of the input pair EP against each other.
  • the upper (pressure) roller can either be arranged vertically above the lower roller (dashed line) or offset in the direction of the original (fully extended).
  • the latter variant is for the combination with a match stop device according to our Swiss Patent application No. 2,957 / 88 advantageous.
  • the length of the pre-drafting field (between the clamping lines of the roller pairs EP and MP) cannot normally be significantly longer (without a push rod) than the average stack length of the material to be processed.
  • the use of a fiber-guiding rod makes it possible to extend the pre-drafting field, which is advantageous for operating work in the pre-drafting field, since the adjustment work is thereby reduced when the stack is changed.

Landscapes

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

Claims (7)

  1. Un train étireur à grand étirage pour un procédé de filage sans banc à broches, avec au moins un champ de préétirage (EP, MP) et au moins un champ d'étirage principal (MP, LP), caractérisé par le fait
    qu'un élément (D) est disposé dans le champ de préétirage (EP, MP) afin de réaliser une déviation prédéterminée de l'écoulement de fibres, et où cet élément ne fléchit pas sous l'effet de la pression exercée par l'écoulement de fibres.
  2. Un train étireur selon revendication 1,
    caractérisé par le fait que
    l'élément (D) est monté d'une manière rigide sur un support stationnaire.
  3. Un train étireur selon revendication 1 ou 2,
    caractérisé par le fait que
    le préétirage est plus grand que 2 fois.
  4. Un train étireur selon l'une des revendications précédentes,
    caractérisé par le fait que
    le ruban présenté au train étireur est plus lourd que 1'000 tex.
  5. Un train étireur selon l'une des revendications précédentes,
    caractérisé par le fait que
    l'élément (D) est pourvu d'un épaulement (S) délimitant la largeur du ruban.
  6. Un train étireur selon l'une des revendications précédentes,
    caractérisé par le fait que
    la largeur du ruban dans l'élément (D) correspond au moins à trois fois l'épaisseur du ruban.
  7. Un train étireur selon l'une des revendications précédentes,
    caractérisé par le fait que
    l'élément (D) se situe dans la zone médiane du champ de préétirage (EP, MP).
EP89115307A 1988-08-30 1989-08-19 Train d'étirage avec une barre de pression dans une zone d'étirage préliminaire Expired - Lifetime EP0358015B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3260/88 1988-08-30
CH326088 1988-08-30

Publications (2)

Publication Number Publication Date
EP0358015A1 EP0358015A1 (fr) 1990-03-14
EP0358015B1 true EP0358015B1 (fr) 1993-09-22

Family

ID=4252131

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89115307A Expired - Lifetime EP0358015B1 (fr) 1988-08-30 1989-08-19 Train d'étirage avec une barre de pression dans une zone d'étirage préliminaire

Country Status (4)

Country Link
US (1) US5016323A (fr)
EP (1) EP0358015B1 (fr)
JP (1) JPH02104728A (fr)
DE (1) DE58905669D1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4242722A1 (de) * 1992-12-17 1994-06-23 Rieter Ingolstadt Spinnerei Druckstab
DE50101978D1 (de) * 2000-11-28 2004-05-19 Truetzschler Gmbh & Co Kg Verfahren und Vorrichtung an einer Spinnereimaschine zum Verziehen eines textilen Faserverbandes, z.B. aus Baumwolle, Chemiefasern u. dgl.
DE20221912U1 (de) * 2002-11-11 2009-06-10 Spindelfabrik Suessen Gmbh Spinnmaschine mit Verdichtungseinrichtung
JP2006200069A (ja) * 2005-01-20 2006-08-03 Murata Mach Ltd 空気式精紡機におけるドラフト装置
CN102433620A (zh) * 2011-10-18 2012-05-02 湖南华升洞庭麻业有限公司 一种短纤维条的并条方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE945822C (de) * 1944-10-28 1956-07-19 Herbert Stein Verfahren und Vorrichtung zum Erzielen eines kleinstmoeglichen, aber die Vorgarndrehung sicher aufloesenden Vorverzuges in Mehrwalzen-Klemmstreckwerken von Spinnmaschinen
GB883823A (en) * 1957-01-31 1961-12-06 Fairbairn Lawson Combe Barbour Drafting devices for textile spinning frames
DE1112433B (de) * 1959-06-23 1961-08-03 Ernst Toenniessen Doppelriemchenstreckwerk fuer Spinnmaschinen
US3748694A (en) * 1971-11-03 1973-07-31 Schaeffler Ohg Industriewerk Drafting system having a supporting roll for offset top feed roll
SU513129A1 (ru) * 1974-06-03 1976-05-05 Костромской Научно-Исследовательский Институт Льняной Промышленности Выт жной прибор
US4387487A (en) * 1979-10-16 1983-06-14 Murata Kikai Kabushiki Kaisha High draft apparatus in spinning machine
JPS5940928B2 (ja) * 1980-04-30 1984-10-03 村田機械株式会社 紡績機に於けるドラフト装置の駆動伝達方法
DE3327966A1 (de) * 1983-08-03 1985-02-21 Fritz 7347 Bad Überkingen Stahlecker Streckwerk fuer spinnereimaschinen
SU1227727A1 (ru) * 1984-11-15 1986-04-30 Всесоюзный заочный институт текстильной и легкой промышленности Выт жной прибор текстильной машины

Also Published As

Publication number Publication date
EP0358015A1 (fr) 1990-03-14
JPH02104728A (ja) 1990-04-17
DE58905669D1 (de) 1993-10-28
US5016323A (en) 1991-05-21

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