EP0358015B1 - Drawing frame with a pressing rod in the break draft zone - Google Patents

Drawing frame with a pressing rod in the break draft zone Download PDF

Info

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)
French (fr)
Other versions
EP0358015A1 (en
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/en
Application granted granted Critical
Publication of EP0358015B1 publication Critical patent/EP0358015B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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)

Description

Diese Erfindung bezieht sich auf ein Hochverzugsstreckwerk für ein flyerloses Spinnverfahren mit mindestens einem Vorverzugsfeld und mindestens einem Hauptverzugsfeld.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.

Die Entwicklung der flyerlosen Spinnverfahren bis zur Mitte der 60-iger Jahre ist im Buch "Die Streckwerke der Spinnereimaschinen" von Dr. Ing. Walter Wegener (Springer-Verlag, Ausgabe 1965, Seite 193 bis 243) zusammengefasst. Im gleichen Buch werden die Konstruktionen und Arbeitsweise der verschiedensten Streckwerksanordnungen erläutert. Insbesondere wird auf den Seiten 245 und 246 der 1965-Ausgabe das sogenannte "Druckstangenstreckwerk" für die Hochleistungsstrecke der damaligen englischen Firma Platt Brothers (Sales) Ltd. erklärt und dargestellt.The development of the flyerless spinning process up to the mid-1960s is described in the book "Die Streckwerke der Spinnereimaschinen" by Dr. Ing. Walter Wegener (Springer-Verlag, edition 1965, pages 193 to 243). The same book explains the constructions and methods of operation of the various drafting arrangements. In particular, on pages 245 and 246 of the 1965 edition the so-called "push rod drafting system" for the high-performance draw frame of the then English company Platt Brothers (Sales) Ltd. explained and presented.

In der Zwischenzeit sind einige weitere flyerlose Spinnverfahren entwickelt worden, die auf der Basis einer Streckwerkspeisung des zu verspinnenden Fasermaterials arbeiten sollten. Die Streckwerke für solche Spinnverfahren müssen mit einem sehr hohen Gesamtverzug arbeiten, welcher den Verzug der heute konventionellen Ringspinnmaschine weit übersteigt. Letztere Maschine ist natürlich dazu konzipiert, das vom Flyer vorverstreckte Vorgarn zu verarbeiten.In the meantime, some more flyer-less spinning processes have been developed, which should work on the basis of a draft feed of the fiber material to be spun. The drafting systems for such spinning processes have to work with a very high total distortion, which far exceeds the distortion of the ring spinning machine that is conventional today. The latter machine is of course designed to process the roving pre-stretched by the flyer.

Das Vorgarn ist schon leicht gedreht, und das Streckwerk einer Ringspinnmaschine hat dementsprechend zwei Aufgaben:

  • die Drehungen des Vorgarnes aufzuheben,
  • das von der Drehung gelöste Material auf die Garnnummer zu verfeinern (zu verstrecken).
The roving is already twisted slightly, and the drafting system of a ring spinning machine has two tasks accordingly:
  • cancel the twists of the roving,
  • to refine (stretch) the material released from the twist to the thread number.

Die erste Aufgabe wird vom Vorverzugsfeld des Streckwerkes erledigt, wobei ein sehr niedriger Verzug (1.1 bis 1.3) ausreicht. Das eigentliche Verziehen geschieht im Hauptverzugsfeld normalerweise mit dem maximal möglichen Verzug für ein einziges Verzugsfeld (ca. 40-, bis manchmal 50-fach).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).

Ein Hochverzugsstreckwerk umfasst daher normalerweise mindestens ein Vorverzugsfeld und ein Hauptverzugsfeld, d.h. mindestens drei Walzenpaare. Dabei ist es heutzutage wohlbekannt, spezielle Massnahmen zu treffen, um die Faserführung im Hauptverzugsfeld zu optimieren. Die Druckstange im vorerwähnten "Druckstangenstreckwerk" der Firma Platt Brothers gehört zu dieser Kategorie von Massnahmen.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. Nowadays it is well known to take special measures to optimize the fiber guidance in the main drafting area. The push rod in the aforementioned "push rod drafting system" from the company Platt Brothers belongs to this category of measures.

Es ist auch bekannt zur Verbesserung der Faserführung im Vorverzugsfeld (besonders bei Verarbeitung von Kurzstapelfasern), einen den Faserstrom umgebenden Kondensor zwischen den Eingangs- und Mittelwalzenpaaren eines Zweizonenstreckwerkes vorzusehen. Dabei kann aber die Neueinführung einer Lunte (eines Bandes oder eines Vorgarnes) in einen solchen Kondensor zu Problemen führen.It is also known to improve fiber guidance in the pre-drafting field (especially when processing Short staple fibers) to provide a condenser surrounding the fiber stream between the input and middle roller pairs of a two-zone drafting system. However, the introduction of a fuse (a ribbon or roving) into such a condenser can lead to problems.

Es ist ferner aus DE-PS 945 822 bekannt, ein Luntenspannungssensor im Vorverzugsfeld anzuordnen und den Vorverzug anhand des Ausgangssignals von diesem Sensor zu regeln. Der Sensor umfasst einen Fühler, der den Faserstrom umlenken muss, um ein Spannungssignal erzeugen zu können. Dabei muss die vom Fühler hervorgerufene Umlenkung variabel sein, so dass das Ausgangssignal sich mit der Luntenspannung ändern kann.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.

Die Erfindung stellt sich nun die Aufgabe, ein Hochverzugsstreckwerk für ein flyerloses Spinnverfahren vorzusehen, das die Faserführung im Vorverzugsfeld wesentlich verbessert, um nachweisbar bessere Garnwerte und eine erhöhte Reissfestigkeit und Dehnung des herzustellenden Garnes zu erreichen.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.

Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.This object is achieved by the features of patent claim 1.

Die Erfindung sieht ein Hochverzugsstreckwerk mit mindestens einem Vorverzugsfeld und mindestens einem Hauptverzugsfeld vor. Vorzugsweise ergibt das Hauptverzugsfeld einen Verzug grösser als 30 und das Vorverzugsfeld einen Verzug grösser als 2, d.h. das Streckwerk ergibt einen Gesamtverzug von mindestens 60.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.

Die Erfindung ist dadurch gekennzeichnet, dass ein Element zur vorbestimmten Umlenkung des Faserstroms im Vorverzugsfeld angeordnet ist wobei das Element nicht unter dem vom Faserstrom ausgeübten Druck nachgibt. Das Vorverzugsfeld kann eines von einer Mehrzahl solcher Felder sein, wobei jedes Feld mit einem jeweiligen Element zur Faserumlenkung versehen werden kann. Das Element kann vorteilhafterweise auch als Faserstrombegrenzungsmittel zur Begrenzung der Ausbreitung des Faserstromes im Vorverzugsfeld ausgebildet werden. Da aber ein solches Element den Faserstrom nicht umgibt, sondern in mindestens einer Richtung freilässt, entstehen aus dieser Anordnung keine Zusatzprobleme bei der Neueinführung der Lunte in das Streckwerk.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.

Die vorbestimmte Umlenkung des Faserstroms kann dadurch erreicht werden, dass das Element entweder starr auf einem Träger oder derart auf einem Träger montiert ist, dass das Element nicht unter dem vom Faserstrom ausgeübten Druck nachgeben kann.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.

Das Verhältnis Breite : Höhe der Lunte am Element sollte so gewählt werden, dass möglichst viele Fasern einer Reibkraft am Element ausgesetzt werden. Dieses Verhältnis ist vorzugsweise mindestens 3 : 1 und noch besser mindestens 4 : 1 sein. Das Element liegt vorteilhafterweise im Mittelbereich des Vorverzugsfeldes d.h. im mittleren Drittel des Abstandes der beiden Klemmpunkte des Vorverzugsfeldes.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.

Das Streckwerk kann mit Vorteil in einer Spinnmaschine eingesetzt werden, welche einer Vorlage aus unverdrehtem Material zu einem Garn verarbeitet. Dabei kann der tex-Wert dieses Materials bei der Einfuhr in das Streckwerk denjenigen des Ringspinnvorgarnes bei weitem übertreffen, z.B. über 1000 tex liegen. Aus diesem Grund muss die Gesamtanordnung einen sehr hohen Verzug (von mehr als 150) aufweisen, was einen relativ hohen Verzug im Vorverzugsfeld (vorzugsweise mindestens 4) notwendig macht.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. For this reason, 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).

Als Beispiel wird eine Ausführung gemäss dieser Erfindung nun anhand der beiliegenden Zeichnungen näher erläutert werden. Es zeigt:

- Figur 1
schematisch und in Seitenansicht eine Streckwerkanordnung gemäss dieser Erfindung,
- Figur 2
(in einem grösseren Maßstab) ein Detail aus der Gesamtanordnung und
- Figur 3
eine Variante der Anordnung gemäss Fig.2.
As an example, an embodiment according to this invention will now be explained in more detail with reference to the accompanying drawings. It shows:
- Figure 1
schematically and in side view a drafting arrangement according to this Invention,
- Figure 2
(on a larger scale) a detail from the overall arrangement and
- Figure 3
a variant of the arrangement according to Fig. 2.

Das in der Figur 1 dargestellte Streckwerk ist für eine Düsenspinnmaschine konzipiert und umfasst ein Lieferwalzenpaar LP, ein Mittelwalzenpaar MP und Eingangswalzenpaar EP. Das zu verspinnende Fasermaterial wird aus einer geeigneten nicht dargestellten Vorlage von links nach rechts in das Streckwerk eingezogen, verstreckt und vom Lieferwalzenpaar LP an eine nicht gezeigte Düsenanordnung zum Falschdrallspinnen befördert. Das Vorlagematerial hat ein tex von über 1000.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.

Das Eingangswalzenpaar EP und Mittelwalzenpaar MP bilden zusammen ein Vorverzugsfeld mit einem Verzug vorzugsweise im Bereich 4 - 8. Das Mittelwalzenpaar MP und Lieferwalzenpaar LP bilden zusammen ein Hauptverzugsfeld mit einem Verzug vorzugsweise grösser als 30 und möglicherweise von ungefähr 40. Das gezeigte Streckwerk ist als ein sogenanntes Doppelriemchenstreckwerk ausgeführt, d.h. die obere und die untere Walze des Mittelwalzenpaares MP sind je mit einem Riemchen R versehen, welches sich von der jeweiligen Walze in das Hauptverzugsfeld erstreckt, um die Faserführung in diesem Verzugsfeld zu verbessern. Diese Anordnung ist aber nicht erfindungswesentlich. Eine Alternativlösung, welche sich auf einer sogenannten Kepastreckwerkanordnung beruht, ist in unserem EP-A-350797 beschrieben worden, und könnte auch im Zusammenhang mit dieser Erfindung benutzt werden.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. However, 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.

Gemäss der vorliegenden Erfindung, ist eine Druckstange D im Vorverzugsfeld dem Eingangswalzenpaar EP nachgestaltet, um den Faserstrom FS in diesem Feld leicht umzulenken und dadurch die Faserführung in diesem Verzugsfeld zu verbessern. Eine solche Verbesserung der Faserführung ist durch eine Verbesserung der von der Spinnstelle erzielbaren Garnwerte nachweisbar und zwar durch eine Erhöhung der Reissfestigkeit und Dehnung und durch eine Reduktion der CV Uster-Werte, Dünnstellen, Dickstellen und Nissen.According to the present 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.

Die Verbesserung entsteht dadurch, dass insbesondere die kürzeren (aber vorzugsweise möglichst viele) Fasern an der Druckstange einer Reibkraft ausgesetzt werden. Diese Reibkräfte an der Druckstange begrenzen die Beschleunigungsstrecke im Verzugsfeld, d.h. die Strecke worin kürzere Fasern auf die höhere Geschwindigkeit des nachgeschalteten Walzenpaares beschleunigt werden.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.

In einer bevorzugten Ausführung (eine Variante,die in der Figur 2 dargestellt ist) wird die Faserführungsfläche F der Druckstange D mit "Schulter" S zur seitlichen Begrenzung der Ausbreitung des Faserstromes im Vorverzugsfeld versehen. Die Fläche F sollte als eine in der Richtung des Faserflusses konvex abgerundete Fläche gebildet werden.In a preferred embodiment (a variant which is shown in FIG. 2), 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.

Die Druckstange D, welche als Umlenkelement für den Faserstrom dient, ist vorzugsweise starr auf einem nicht gezeigten Halter montiert. Letzterer kann stationär vom Gestell des Streckwerkes getragen werden. Die Stange D könnte aber um die eigene Längsachse drehbar sein.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.

Die Position der Druckstange im Vorverzugsfeld ist für die optimale Wirkung wichtig. Sie ist vorzugsweise ungefähr in der Mitte des Feldes (zwischen den beiden, dieses Feld begrenzenden Klemmlinien) angebracht.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).

Figur 1 zeigt die Druckstange auf der "unteren" Seite der Lunte d.h. auf der gleichen Seite wie die positiv angetriebenen Walzen. Die Druckstange könnte aber auch auf der anderen Seite der Lunte angeordnet werden. Die notwendige Umlenkung der Fasern ist sehr klein; eine Umlenkung von ca 1 mm gegenüber der Bahn der Fasern in der Abwesenheit der Stange reicht zur Erzielung der notwendigen Reibkraft und den damit verbundenen Verbesserungen.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.

Die Stange ist nicht unbedingt rund (zylindrisch) hat aber vorzugsweise die schon erwähnte konvex abgerundete, faserführende Fläche F. Diese Fläche F kann aber auch in der Querrichtung eine konvexe Form aufweisen, wie dies in Fig. 3 gezeigt ist. Diese Figur zeigt auch mit gestrichelten Linien die bevorzugte Gestaltung der Lunte an der Druckstange, nämlich als eine relativ dünne, breite Schicht. Die Breite dieser Schicht steht vorzugsweise im Verhältnis 4 : 1 oder mehr zur Schichttiefe.The rod is not necessarily round (cylindrical) but preferably has the already mentioned convexly rounded, fiber-guiding surface F. However, 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.

Figur 1 zeigt zwei mögliche Stellungen der beiden Walzen des Eingangspaares EP gegeneinander. Die obere (Druck-) Walze kann entweder senkrecht oberhalb der unteren Walze angeordnet werden (gestrichelt) oder in der Richtung der Vorlage versetzt sein (voll ausgezogen). Letztere Variante ist für die Kombination mit einer Luntenstopvorrichtung gemäss unserer schweizerischen Patentanmeldung Nr. 2.957/88 vorteilhaft.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.

Die Länge des Vorverzugsfeldes (zwischen der Klemmlinien der Walzenpaaren EP und MP) kann normalerweise (ohne Druckstange) nicht erheblich länger als die mittlere Stapellänge des zu verarbeitenden Materials sein. Der Gebrauch einer faserführenden Stange ermöglicht aber die Verlängerung des Vorverzugsfeldes, was für Bedienungsarbeiten im Vorverzugsfeld günstig ist, da die Einstellarbeit bei einer Änderung des Stapels dadurch reduziert wird.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. However, 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.

Claims (7)

  1. A drawing frame with a pressing rod in the break draft zone with at least one break draft zone (EP, MP) and at least one main drafting zone (MP, LP), characterized in that an element (D) is arranged for the predefined deflection of the stream of fibres in the break draft zone (EP, MP), whereby said element does not yield to the pressure exerted by the fibre stream.
  2. A drawing frame as claimed in claim 1, characterized in that the element (D) is rigidly arranged on a stationary support.
  3. A drawing frame as claimed in claim 1 or 2, characterized in that the break draft is higher than two-fold.
  4. A drawing frame as claimed in one of the previous claims, characterized in that the sliver supplied to the drawing frame is heavier than 1000 tex.
  5. A drawing frame as claimed in one of the previous claims, characterized in that the element (D) is provided with a shoulder (S) for limiting the width of the sliver.
  6. A drawing frame as claimed in one of the previous claims, characterized in that the width of the sliver on the element (D) is at least equivalent to three times the depth of the sliver.
  7. A drawing frame as claimed in one of the previous claims, characterized in that the element (D) is situated in the central zone of the break draft zone (EP, MP).
EP89115307A 1988-08-30 1989-08-19 Drawing frame with a pressing rod in the break draft zone Expired - Lifetime EP0358015B1 (en)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=4252131

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89115307A Expired - Lifetime EP0358015B1 (en) 1988-08-30 1989-08-19 Drawing frame with a pressing rod in the break draft zone

Country Status (4)

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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4242722A1 (en) * 1992-12-17 1994-06-23 Rieter Ingolstadt Spinnerei Pressure rod
DE50101978D1 (en) * 2000-11-28 2004-05-19 Truetzschler Gmbh & Co Kg Method and device on a spinning machine for drawing a textile fiber structure, e.g. made of cotton, chemical fibers and. like.
DE10252631A1 (en) * 2002-11-11 2004-05-19 Maschinenfabrik Rieter Ag Sliver drawing unit for a spinning machine, with a condenser, has a guide to deflect the sliver path before condensing, in a controlled movement preventing short fibers from projecting out of the sliver
JP2006200069A (en) * 2005-01-20 2006-08-03 Murata Mach Ltd Draft mechanism in air-jet fine spinning frame
CN102433620A (en) * 2011-10-18 2012-05-02 湖南华升洞庭麻业有限公司 Staple fiber drawing method

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE945822C (en) * 1944-10-28 1956-07-19 Herbert Stein Method and device for achieving a pre-draft which is as small as possible but which reliably dissolves the roving twist in multi-roller pinch drafting units of spinning machines
GB883823A (en) * 1957-01-31 1961-12-06 Fairbairn Lawson Combe Barbour Drafting devices for textile spinning frames
DE1112433B (en) * 1959-06-23 1961-08-03 Ernst Toenniessen Double apron drafting system for spinning machines
US3748694A (en) * 1971-11-03 1973-07-31 Schaeffler Ohg Industriewerk Drafting system having a supporting roll for offset top feed roll
SU513129A1 (en) * 1974-06-03 1976-05-05 Костромской Научно-Исследовательский Институт Льняной Промышленности Exhaust appliance
US4387487A (en) * 1979-10-16 1983-06-14 Murata Kikai Kabushiki Kaisha High draft apparatus in spinning machine
JPS5940928B2 (en) * 1980-04-30 1984-10-03 村田機械株式会社 Drive transmission method for draft device in spinning machine
DE3327966A1 (en) * 1983-08-03 1985-02-21 Fritz 7347 Bad Überkingen Stahlecker STRETCHER FOR SPINNING MACHINES
SU1227727A1 (en) * 1984-11-15 1986-04-30 Всесоюзный заочный институт текстильной и легкой промышленности Drawing device of textile machine

Also Published As

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

Similar Documents

Publication Publication Date Title
DE19514408C5 (en) Ring spinning process
DE3023936A1 (en) DEVICE FOR PRODUCING A YARN
EP1664404B1 (en) Device for the production of rove by means of a pneumatic spinning process and use of such an device
EP0358015B1 (en) Drawing frame with a pressing rod in the break draft zone
WO2008017340A1 (en) Apparatus for producing a knitted fabric
EP2513362B1 (en) Ring spinning machine having a false twist device
DE3021632A1 (en) SPinning machine, preferably ring spinning machine
WO2005026420A1 (en) Drawing frame-roving frame combination for the production of rove by means of a pneumatic spinning process
EP3604646B1 (en) Drawing frame unit
EP0369121A1 (en) Heating method in textile machines
CH633836A5 (en) METHOD AND DEVICE FOR TORNING A TWO OR MULTIPLE YARN IN THREAD BREAKINGS.
EP0903430A2 (en) Spinning method and machine with condenser
CH681896A5 (en)
WO2019115265A1 (en) Drawing frame for a spinning machine comprising a compaction device
DE102006006504B4 (en) Drawing process and drafting device for refining fiber material
EP3819411A1 (en) Ring spinning machine and method for operating a spinning position of a spinning machine
EP0455190B1 (en) Sliver condensing guide on a flyer
DE102015009500A1 (en) Method for operating a ring spinning machine, ring spinning machine and drafting system
EP1584715A1 (en) Method of manufacturing a yarn in an air-vortex spinning machine
EP2628829B1 (en) Stretching unit for stretching a rove
CH699523A2 (en) Drawing frame i.e. three cylinder-drawing frame, for use in ring spinning machine i.e. staple fiber-spinning machine, has passage line whose distance to surface of outlet lower cylinder is smaller than that to surface of outlet press roller
DE3825068A1 (en) STRETCHER FOR A SPINNING MACHINE
DE102005022186A1 (en) Production of air-spun threads from a fiber band on a stretching device involves use of a fiber band having a twist before the clamping gap of the exiting rollers
DE889572C (en) Cotton drafting system for spinning long and extra-long fibers
DE19549690B4 (en) Ring spinning - has total sliver draft to structured level

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE ES FR GB IT LI

17P Request for examination filed

Effective date: 19900427

17Q First examination report despatched

Effective date: 19910930

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE ES FR GB IT LI

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 19930922

Ref country code: FR

Effective date: 19930922

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19930922

Ref country code: GB

Effective date: 19930922

REF Corresponds to:

Ref document number: 58905669

Country of ref document: DE

Date of ref document: 19931028

EN Fr: translation not filed
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 19930922

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19940831

Ref country code: CH

Effective date: 19940831

26N No opposition filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19950503