EP0020392A1 - Process and device for the doffing and the measuring with continuous adjustment of the weft thread in a loom - Google Patents

Process and device for the doffing and the measuring with continuous adjustment of the weft thread in a loom

Info

Publication number
EP0020392A1
EP0020392A1 EP79901081A EP79901081A EP0020392A1 EP 0020392 A1 EP0020392 A1 EP 0020392A1 EP 79901081 A EP79901081 A EP 79901081A EP 79901081 A EP79901081 A EP 79901081A EP 0020392 A1 EP0020392 A1 EP 0020392A1
Authority
EP
European Patent Office
Prior art keywords
drum
thread
weft
take
weft thread
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Withdrawn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
EP79901081A
Other languages
German (de)
French (fr)
Inventor
Walter Scheffel
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.)
Individual
Original Assignee
Individual
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
Priority claimed from DE19782839454 external-priority patent/DE2839454A1/en
Priority claimed from DE19792906569 external-priority patent/DE2906569A1/en
Application filed by Individual filed Critical Individual
Publication of EP0020392A1 publication Critical patent/EP0020392A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
    • D03D47/363—Construction or control of the yarn retaining devices

Definitions

  • the present invention relates to a method for pulling and for the infinitely variable measurement of a weft thread on a weaving machine with a fixed weft supply spool and with a continuously rotating take-off drum which is wrapped in the weft thread.
  • German published patent application 23 65 036 has already disclosed a device on a weaving machine which is suitable for continuously pulling a weft thread from fixed supply bobbins
  • OMPI WIPO ⁇ can be measured in an infinitely variable manner in order to then feed the weft further to the entry via a memory.
  • Arrangements of this type work by means of one or more continuously rotating draw-off drums, which are changed in their number of revolutions per weaving cycle by a non-form-fitting, infinitely variable drive when the weft thread length has to be changed.
  • the low coefficient of friction that can be achieved with these devices which is based only on a high pressure of the point-like thread contact, thus results in damage or deformation of the weft thread cross section, as well as rapid wear of the drum covering, so that this type of construction cannot be used economically.
  • the task therefore arises of how, with a cheap, thread-saving coefficient of friction through multiple wrapping of the thread take-off drum, an infinitely variable, precise thread length measurement by means of a simple, light take-off drum with low inertial forces can also be achieved for the drive, and the known defects the costly excess weft lengths can be avoided.
  • the present invention relates to a device for carrying out the method on a weaving machine with a fixed weft supply spool and with a continuously rotating take-off drum which is wrapped in the weft thread.
  • This device is characterized according to the invention in that the take-off drum is designed as a cone and in that a plurality of thread guides are arranged radially around the drum shell and these thread guides can be displaced at least approximately parallel to the drum axis.
  • any internal thread distortion or stretching during dimensioning can be completely avoided, however the length dimension can then also be infinitely variable in that the different drum diameter ranges - which are kept very low among one another - can be compensated for by a thread brake connected upstream of the take-off drum and the thread tension which can thus be controlled.
  • the advantage of the infinitely variable length measurement is achieved by the thread guides arranged radially around the drum jacket, in that they are slidably mounted parallel to the drum axis.
  • OMPI bm IPO Arrangement in their radial plane can be displaced slightly axially, despite the unlimited passage of the eyelets for nodes and. other unevenness in the thread, achieve an optimal wrapping density of the thread around the drum shell, so that during the pull-off and measuring process such a low stretching or stretching effect becomes effective that even endless, inelastic thread materials can be processed precisely and without interference.
  • FIG. 1 shows a device according to the invention in front view
  • FIG. 2 shows a variant of the device according to FIG. 1, in a side view.
  • the two embodiments of the device on a weaving machine according to FIGS. 1 and 2 differ only in that the draw-off drum 5 in FIG. 1 is designed as a cone with a linear lateral surface and 5 in that the draw-off drum 17 in FIG. 2 is designed as a cone with a stepped lateral surface.
  • the two embodiments are therefore described below together and without further distinction.
  • the take-off drum 5 or 17 runs continuously, driven by the axis 16.
  • the take-off drum 5 or 17 is radially surrounded by a plurality of thread guides 3, 6, 8, 10, 12 and 14, which are arranged together on a carrier 18. With this carrier 18, the thread guides can be displaced parallel to the axis 16 of the take-off drum 5 or 17 in the direction of the arrows 19.
  • a weft thread 1 drawn off from a weft thread supply bobbin (not shown in more detail) is then turned by a thread brake 2 via the eyelet of the thread guide 3 into a first loop 4 around the take-off roller 5; then over the eyelet of the thread guide 6 to the second loop 7; , - then over the eyelet of the thread guide 8 to the third
  • the eyelets of the yarn guide 3, 6, 8, 10, 12 and 1-4 are due to the radial arrangement of the yarn feeders around the drum casing 5 and 17 in their passage width • sufficiently far executable that diverse character ste yarns 1 with knots and Unevenness can pass without problems.
  • take-off drum 17 shown in FIG. 2 is expedient to design the take-off drum 17 shown in FIG. 2 as a step-shaped cone at the step transitions 20 to have a flat, conical shape.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Abstract

Le dispositif comprend un cylindre (5) dispose sur un axe (16) et entoure radialement de plusieurs guide-fils (3, 6, 8, 10, 12, 14) qui sont reunis sur un support (18). Ce support (18) peut coulisser le long de l'axe (16) du cylindre (5). Le cylindre (5) est conique. Ceci permet d'appliquer les spires du fil de trame sur plusieurs zones de diametres differents ou la tension du fil augmente dans une spire et le coefficient de friction devient plus grand pour garantir une levee du fil sans glissement.The device comprises a cylinder (5) arranged on an axis (16) and radially surrounds several wire guides (3, 6, 8, 10, 12, 14) which are united on a support (18). This support (18) can slide along the axis (16) of the cylinder (5). The cylinder (5) is conical. This makes it possible to apply the turns of the weft wire to several areas of different diameters where the tension of the wire increases in a turn and the coefficient of friction becomes greater to guarantee lifting of the wire without slipping.

Description

Verfahren und Vorrichtung zum Abziehen und zum stufenlos regelbaren Abmessen eines Schussfadens an einer WebmaschineMethod and device for pulling and for the continuously adjustable measurement of a weft thread on a weaving machine
Die- vorliegende Erfindung betrifft ein Verfahren zum Abziehen und zum stufenlos regelbaren Abmessen eines Schussfadens an einer Webmaschine mit feststehender Schussvorratsspule und mit kontinuierlich umlaufender Abzugstrommel, welche vom Schussfaden umschlungen ist.The present invention relates to a method for pulling and for the infinitely variable measurement of a weft thread on a weaving machine with a fixed weft supply spool and with a continuously rotating take-off drum which is wrapped in the weft thread.
Durch die deutsche Offenlegungsschrift 23 65 036 ist bereits eine Vorrichtung an einer Webmaschine bekannt geworden, die geeignet ist, einen Schussfaden von feststehenden Vorratsspulen kontinuierlich abzuziehenThe German published patent application 23 65 036 has already disclosed a device on a weaving machine which is suitable for continuously pulling a weft thread from fixed supply bobbins
OMPI WIPO Λ und stufenlos regelbar abzumessen, um den Schussfaden dann weiter über einen Speicher dem Eintrag zuzuführen. Anordnungen dieser Art arbeiten mittels einer oder meh¬ reren kontinuierlich umlaufenden Abzugstrommeln, die bei erforderlicher Aenderung der Schussfadenlänge in ihrer Umdrehungszahl pro Webzyklus durch einen nicht formschlüssigen, stufenlos regelbaren Antrieb verän¬ dert werden.OMPI WIPO Λ and can be measured in an infinitely variable manner in order to then feed the weft further to the entry via a memory. Arrangements of this type work by means of one or more continuously rotating draw-off drums, which are changed in their number of revolutions per weaving cycle by a non-form-fitting, infinitely variable drive when the weft thread length has to be changed.
Während der für den Fadenabzug nötige Reibungsbeiwert durch mehrere Fadenumwindungen erzeugt wird, tritt bei einem Webmaschinenstop durch die Massenkräfte an der Abzugstrommel im nicht formschlüssigen Antrieb eine be¬ trächtliche Phasenverschiebung mit zu langen Schussfa¬ denlängen ein. Dem gegenüber führt bei einem schnellen Anlauf der Webmaschine eine durch Massenkräfte verzö¬ gerte Beschleunigung zu zu kurz abgemessenen Schussfä¬ den, sodass wegen der dadurch auftretenden Schussfehler der Webvorgang unterbrochen wird bzw. nicht zum Anlauf kommen kann. Diese leistungsmindernden Folgen können nur durch den Eintrag von ausreichenden üeberlängen vermieden werden, was unwirtschaftlichen MaterialVer¬ lust zur Folge hat.While the coefficient of friction required for thread take-off is generated by several thread wraps, a substantial phase shift with excessively long weft thread lengths occurs during a loom stop due to the inertial forces on the take-off drum in the non-positive drive. In contrast, when the weaving machine starts up quickly, acceleration decelerated by inertial forces leads to weft threads that are measured too short, so that the weaving process is interrupted or cannot start up due to the resulting weft errors. These performance-reducing consequences can only be avoided by entering sufficient excess lengths, which results in uneconomical material loss.
Andererseits ist aber die Anwendung eines aufwendigenOn the other hand, the application is complex
-gJ_.E_C^ OMPI formschlüssigen, stufenlos regelbaren Antriebes für die mit hoher Drehzahl umlaufenden Abzugs-, und Messtrommeln infolge der steil ansteigenden Massenkräfte und der da¬ mit erhöhten Bruchgefahr und Verschleisserscheinung nicht möglich.-gJ_.E_C ^ OMPI positive, infinitely variable drive for the pulling and measuring drums rotating at high speed is not possible due to the steeply increasing inertia forces and the increased risk of breakage and wear.
Weitere bekannte Vorrichtungen gemäss der CH-Patent- schrift 285 745 oder der DE-Offenlegungsschrift 17 85' 31^ sehen vor, den Schussfaden zwischen zwei kon¬ tinuierlich umlaufenden Trommeln, von denen mindestens eine konisch ausgebildet ist, eingeklemmt durchlaufen und abziehen zu lassen, wobei nur geringe Reibungswer¬ te entstehen, die durch Knoten oder andere Unebenheiten des Schussfadens noch verringert werden, sodass vor¬ sorglich überlange Schussfäden zum Eintrag kommen müs- sen und so ein hoher Materialverlust entsteht.Further known devices according to CH patent 285 745 or DE laid-open document 17 85 '31 ^ provide for the weft thread to be traversed and pulled between two continuously rotating drums, of which at least one is conical, whereby only low friction values arise, which are further reduced by knots or other unevenness of the weft thread, so that excessively long weft threads have to be introduced as a precaution and thus a high loss of material occurs.
Der bei diesen Vorrichtugen erzielbare geringe Rei¬ bungsbeiwert , der nur auf einen hohen Andruck der punktartigen Fadenberührung basiert, hat damit eine Be¬ schädigung oder Verformung des Schussfadenquerschnit- tes , wie auch einen schnellen Verschleiss des Trom¬ melbelages, zur Folge, sodass diese Bauart nicht wirt¬ schaftlich einsetzbar ist. Es stellt sich daher die Aufgabe, wie mit einem gün¬ stigen, fadenschonenden Reibungsbeiwert durch mehrfa¬ che Umschlingung der Fadenabzugstrommel zugleich auch eine stufenlos regelbare, präzise Fadenlängenmessung mittels einer, einfachen, leichten Abzugstrommel bei geringen Massenkräften für den Antrieb erreichbar wird und die bekannten Mängel der kostenauslδsenden Schuss- fadenüberlängen vermieden werden können.The low coefficient of friction that can be achieved with these devices, which is based only on a high pressure of the point-like thread contact, thus results in damage or deformation of the weft thread cross section, as well as rapid wear of the drum covering, so that this type of construction cannot be used economically. The task therefore arises of how, with a cheap, thread-saving coefficient of friction through multiple wrapping of the thread take-off drum, an infinitely variable, precise thread length measurement by means of a simple, light take-off drum with low inertial forces can also be achieved for the drive, and the known defects the costly excess weft lengths can be avoided.
Diese Aufgabe wird nun durch das erfindungsgemässe Ver- fahren dadurch gelöst, dass die Schussfadenumschlin- gungen über mehr als einen Bereich unterschiedlichen Umfanges des Trommelmantels so gelegt sind, dass die Fadenspannung innerhalb der Umwicklung ansteigt und der Reibungsbeiwert für einen schlupflosen Fadenabzug zu- nimmt.This object is now achieved by the method according to the invention in that the weft thread wraps are placed over more than one area of different circumference of the drum shell in such a way that the thread tension increases within the winding and the friction coefficient for a slip-free thread take-off increases.
Durch diese Massnahmen ist es nunmehr möglich, dass während des Fadenlaufes um die Abzugstrommel ein inter¬ ner Verzug des Schussfadens auf das geringste,für das Schussmaterial noch tragbare Mass zur Erhaltung der be- stimmten Materialeigenschaft beschränkt bleiben kann.Through these measures it is now possible that an internal warping of the weft thread during the thread run around the take-off drum can be limited to the smallest dimension that is still acceptable for the weft material in order to maintain the specific material property.
Ferner betrifft die vorliegende Erfindung eine Vorrich- tung zur Durchführung des Verfahrens an einer Webmaschine mit feststehender Schussvorratsspule und mit kontinu¬ ierlich umlaufender Abzugstrommel, welche vom Schuss- fadeh umschlungen ist.Furthermore, the present invention relates to a device for carrying out the method on a weaving machine with a fixed weft supply spool and with a continuously rotating take-off drum which is wrapped in the weft thread.
Diese Vorrichtung zeichnet sich erfindungsgemäss da- durch aus, dass die Abzugstrommel als Konus ausgebil¬ det ist und dass eine Mehrzahl Fadenführer radial um den Trommelmantel angeordnet und diese Fadenführer we¬ nigstens angenähert parallel der Trommelachse ver¬ schiebbar sind.This device is characterized according to the invention in that the take-off drum is designed as a cone and in that a plurality of thread guides are arranged radially around the drum shell and these thread guides can be displaced at least approximately parallel to the drum axis.
Bei Verwendung einer solchen erfindungsgemässen Vor¬ richtung„ deren Abzugstrommelmantel als stufenförmiger Konus ausgebildet ist, kann in Verbindung mit der ra¬ dialen Anordnung der Fadenführer bzw. deren Oesen jeder interne Fadenverzug bzw. jede Dehnung während des Ab- messens ganz vermieden werden, wobei jedoch die Längen¬ abmessung auch dann noch stufenlos erfolgen kann, indem die unterschiedlichen Trommeldurchmesserbereiche - die untereinander sehr gering gehalten werden - durch eine, der Abzugstrommel vorgeschaltete Fadenbremse und der damit steuerbaren Fadenvorspannung ausgleichbar sind.When using such a device according to the invention, whose take-off drum jacket is designed as a step-shaped cone, in connection with the radial arrangement of the thread guides or their eyelets, any internal thread distortion or stretching during dimensioning can be completely avoided, however the length dimension can then also be infinitely variable in that the different drum diameter ranges - which are kept very low among one another - can be compensated for by a thread brake connected upstream of the take-off drum and the thread tension which can thus be controlled.
Durch diese Massnahmen wird weiter vorteilhaft erreicht, dass durch eine entsprechende Stellung der achsial ver¬ schiebbaren Fadenführer die Fadenumwicklung gleichzeitigThrough these measures it is further advantageously achieved that the thread winding at the same time by a corresponding position of the axially displaceable thread guide
OMPIOMPI
/,, WIIPPOO „ . über zwei Trommelbereiche unterschiedlichen Umfanges verlegt werden kann. Die hierbei auf dem Trommelbereich mit grösserem Umfang verlegten Wicklungen werden ihre Spannung erhöhen, womit der Reibungsbeiwert ansteigt und die Zahl der Umwicklungen, und damit auch die Band¬ breite der Umwicklung verringert werden kann./ ,, WIIPPOO ". can be laid over two drum areas of different sizes. The windings which are laid on the drum area with a larger circumference will increase their tension, which increases the coefficient of friction and the number of windings, and thus also the bandwidth of the winding, can be reduced.
Bei einer Ausführungsvariante der Anordnung, bei wel¬ cher die Abzugstrommel als Konus mit linearer Mantel¬ fläche ausgebildet ist, ergibt sich ein weiterer Vor- teil, indem sich jede Fadenwicklung durch den zunehmen¬ den Umfang der konischen Abzugstrommel in ihrer Span¬ nung erhöht und damit der Reibungsbeiwert ansteigt, womit es wiederum möglich ist, die Zahl der Umwicklun¬ gen zu verringern.In an embodiment variant of the arrangement in which the draw-off drum is designed as a cone with a linear lateral surface, there is a further advantage in that each thread winding increases in tension due to the increasing circumference of the conical draw-off drum so that the coefficient of friction increases, which in turn makes it possible to reduce the number of wraps.
Der Vorteil der stufenlos regelbaren Längenmessung wird durch die radial um den Trommelmantel angeordneten Fa¬ denführer erreicht, indem diese parallel der Trommel¬ achse verschiebbar gelagert sind.The advantage of the infinitely variable length measurement is achieved by the thread guides arranged radially around the drum jacket, in that they are slidably mounted parallel to the drum axis.
Durch die erfindungsgemässen Massnahmen, einige Faden- Wicklungen um eine konisch ausgebildete Abzugstrommel zu legen,in Verbindung mit den radial um die Trommel angeordneten Fadenführern, welche aufgrund der radialenThrough the measures according to the invention, placing a few thread windings around a conically shaped take-off drum, in connection with the thread guides arranged radially around the drum, which due to the radial
OMPI bm IPO Anordnung in ihrer radialen Ebene gering achsial ver¬ setzt werden können, lässt sich, trotz unbegrenzt wei¬ tem Oesendurchgang für Knoten und. andere Unebenheiten im Faden, eine optimale Umwicklungsdichte des Fadens um den Trommelmantel erreichen, sodass während des Ab¬ zugs- und Messvorganges ein so geringer Streck- bzw. Dehnungseffekt wirksam wird, dass sich auch endlose, unelastische Fadenmaterialien präzise und störungsfrei verarbeiten lassen.OMPI bm IPO Arrangement in their radial plane can be displaced slightly axially, despite the unlimited passage of the eyelets for nodes and. other unevenness in the thread, achieve an optimal wrapping density of the thread around the drum shell, so that during the pull-off and measuring process such a low stretching or stretching effect becomes effective that even endless, inelastic thread materials can be processed precisely and without interference.
Dabei ergibt sich für solche, in ihrer Oberfläche äussers-t glatte endlose Materialien ein weiterer Vor¬ teil, indem die um den ansteigenden Konus liegenden Wicklungen an Spannung und damit an Reibungsbeiwert zu¬ nehmen, wodurch ein Schlüpf wie auch Längenabweichun- gen vermieden werden.This results in a further advantage for such extremely smooth, endless surface materials in that the windings around the rising cone increase in tension and thus in the coefficient of friction, thereby avoiding slippage and length deviations.
Beispielsweise Ausführungsformen des Erfindungsgegen¬ standes sind nachfolgend anhand der Zeichnung näher beschrieben. Es zeigen:For example, embodiments of the subject matter of the invention are described in more detail below with reference to the drawing. Show it:
Figur 1 eine erfindungsgemässe Vorrichtung in Front- ansieht; und1 shows a device according to the invention in front view; and
Figur 2 eine Ausführungsvariante der Vorrichtung ge- mäss Figur 1, in Seitenansicht. Die beiden Ausführungsformen der Vorrichtung an einer Webmaschine gemäss den Figuren 1 und 2 unterscheiden sich lediglich dadurch, dass die Abzugstrommel 5 in Figur 1 als Konus mit linearer Mantelfläche und 5 dass die Abzugstrommel 17 in Figur 2 als Konus mit stu¬ fenförmiger Mantelfläche ausgebildet ist. Im folgenden werden deshalb beide Ausführungsformen gemeinsam und ohne weitere Unterscheidung beschrieben.2 shows a variant of the device according to FIG. 1, in a side view. The two embodiments of the device on a weaving machine according to FIGS. 1 and 2 differ only in that the draw-off drum 5 in FIG. 1 is designed as a cone with a linear lateral surface and 5 in that the draw-off drum 17 in FIG. 2 is designed as a cone with a stepped lateral surface. The two embodiments are therefore described below together and without further distinction.
Die Abzugstrommel 5 bzw. 17 läuft kontinuierlich, 0 durch die Achse 16 angetrieben, um.The take-off drum 5 or 17 runs continuously, driven by the axis 16.
Gemäss den Figuren 1 und 2 ist die'Abzugstrommel 5 bzw. 17 radial von einer Mehrzahl Fadenführern 3 , 6, 8, 10, 12 und 14 umgeben, die gemeinsam auf einem Träger 18 angeordnet sind. Mit diesem Träger 18 sind die Fa- 5 denführer parallel der Achse 16 der Abzugstrommel 5 bzw. 17 in Richtung der Pfeile 19 verschiebbar.According to FIGS. 1 and 2, the take-off drum 5 or 17 is radially surrounded by a plurality of thread guides 3, 6, 8, 10, 12 and 14, which are arranged together on a carrier 18. With this carrier 18, the thread guides can be displaced parallel to the axis 16 of the take-off drum 5 or 17 in the direction of the arrows 19.
Ein, von einer nicht näher gezeigten Schussfadenvor- ratsspule abgezogener Schussfaden 1 wird nun durch eine Fadenbremse 2 über die Oese des Fadenführers 3 zu einer 0 ersten Umschlingung 4 um die Abzugswalze 5; dann über die Oese des Fadenführers 6 zur zweiten Umschlingung 7; , - dann über die Oese des Fadenführers 8 zur drittenA weft thread 1 drawn off from a weft thread supply bobbin (not shown in more detail) is then turned by a thread brake 2 via the eyelet of the thread guide 3 into a first loop 4 around the take-off roller 5; then over the eyelet of the thread guide 6 to the second loop 7; , - then over the eyelet of the thread guide 8 to the third
OMPI •, WIPO - >OMPI •, WIPO - >
Umschlingung 9; dann über die Oese des Fadenführers 10 zur nächsten Umschlingung 11; dann über die Oese des Fadenführers 12 zur weiteren Umschlingung 13 und dann über die Oese des Fadenführers 14 zur letzten Umschlin- gung und von dort zur Abzugsdüse 15 geführt.Wrap 9; then via the eyelet of the thread guide 10 to the next loop 11; then via the eyelet of the thread guide 12 to the further loop 13 and then via the eyelet of the thread guide 14 to the last loop and from there to the take-off nozzle 15.
Die Oesen der Fadenführer 3, 6, 8, 10, 12 und 1-4 sind dabei aufgrund der radialen Anordnung der Fadenführer um den Trommelmantel 5 bzw. 17 in ihrer Durchgangsweite • so ausreichend weit ausführbar, dass unterschiedlich- ste Fäden 1 mit Knoten und Unebenheiten störungsfrei passieren können.The eyelets of the yarn guide 3, 6, 8, 10, 12 and 1-4 are due to the radial arrangement of the yarn feeders around the drum casing 5 and 17 in their passage width • sufficiently far executable that diverse character ste yarns 1 with knots and Unevenness can pass without problems.
Es ist günstig, die in Figur 2 als stufenförmiger Ko¬ nus dargestellte Abzugstrommel 17 an den Stufenüber¬ gängen 20 flach konisch auszubilden.It is expedient to design the take-off drum 17 shown in FIG. 2 as a step-shaped cone at the step transitions 20 to have a flat, conical shape.
Entgegen den vorbeschriebenen Ausführungsformen gemäss den Figuren 1 und 2 kann es von Vorteil sein, wenn die Abzugstrommel 5 bzw. 17 mit ihrem kleineren Durch¬ messer antriebsseitig angeordnet ist, wodurch sich das Umwickeln der Abzugstrommel 5 bzw. 17 mit dem von der Vorratsspule kommenden Schussfaden 1 für die Bedienung der Webmaschine handlicher gestaltet. Entsprechend die- ser Lage der Abzugstrommel 5 bzw. 17 mit ihrem Konus wird damit auch die Anordnung der radial liegenden Fa- denführ*er 3, 6, 8, 10, 12 und 14 umgekehrt. Contrary to the previously described embodiments according to FIGS. 1 and 2, it can be advantageous if the draw-off drum 5 or 17 with its smaller diameter is arranged on the drive side, as a result of which the wrapping-around of the draw-off drum 5 or 17 with the weft thread coming from the supply bobbin 1 designed to be more manageable for operating the weaving machine. Accordingly DIE ser position of the drawing drum 5 and 17 with its cone, the arrangement of Fa is thus radially denführ * er 3, 6, 8, 10, 12 and 14 are reversed.

Claims

Patentansprüche Claims
1. Verfahren zum Abziehen und zum stufenlos regelba¬ ren Abmessen eines Schussfadens an einer Webmaschi¬ ne mit feststehender Schussvorratsspule und mit kontinuierlich umlaufender Abzugstrommel, welche1. A method for drawing off and for the infinitely variable measurement of a weft thread on a weaving machine with a fixed weft supply spool and with a continuously rotating take-off drum, which
5 vom Schussfaden umschlungen ist,: dadurch gekenn¬ zeichnet, dass die Schussfadenumschlingungen über mehr als einen Bereich unterschiedlichen Umfanges des Trommelmantels so gelegt sind, dass die Faden¬ spannung innerhalb der Umwicklung ansteigt und der 10 Reibungsbeiwert für einen schlupflosen Fadenabzug zunimmt.5 is wrapped in the weft thread : characterized in that the weft thread wraps are placed over more than one area of different circumference of the drum shell in such a way that the thread tension increases within the wrapping and the coefficient of friction for a slip-free thread take-off increases.
2. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 an einer Webmaschine mit feststehender Schussvorratsspule und mit kontinuierlich umlaufen-2. Device for performing the method according to claim 1 on a weaving machine with a fixed weft supply spool and with continuously rotating
15 der Abzugstrommel, welche vom Schussfaden umschlun¬ gen ist, dadurch gekennzeichnet, dass die Abzugs¬ trommel (5;17) als Konus ausgebildet ist; und dass eine Mehrzahl Fadenführer (3, 6, 8, 10, 12, 14) radial um den Trommelmantel angeordnet und diese15 of the draw-off drum, which is wrapped by the weft thread, characterized in that the draw-off drum (5; 17) is designed as a cone; and that a plurality of thread guides (3, 6, 8, 10, 12, 14) are arranged radially around the drum shell and this
,20 Fadenführer wenigstens angenähert parallel der Trommelachse (16) verschiebbar sind., 20 thread guides at least approximately parallel to the Drum axis (16) are displaceable.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeich¬ net, dass die Abzugstrommel (5) als Konus mit line¬ arer Mantelfläche ausgebildet ist.3. Device according to claim 2, characterized in that the extraction drum (5) is designed as a cone with a linear outer surface.
4. Vorrichtung nach Anspruch 2, dadurch gekennzeich¬ net, dass die Abzugstrommel (17) als Konus mit stu¬ fenförmiger Mantelfläche ausgebildet ist.4. The device according to claim 2, characterized gekennzeich¬ net that the discharge drum (17) is designed as a cone with a step-shaped outer surface.
5. Vorrichtung nach Anspruch 2, dadurch gekennzeich¬ net, dass die Fadenführer (3, 6, 8, 10, 12, 14) gemeinsam auf einem, längs der Achse 16 der Ab¬ zugstrommel (5;17) hin- und herschiebbaren Träger (18) befestigt sind. 5. The device according to claim 2, characterized gekennzeich¬ net that the thread guides (3, 6, 8, 10, 12, 14) together on a, along the axis 16 of the Ab¬ take-off drum (5; 17) back and forth slide (18) are attached.
EP79901081A 1978-09-11 1980-04-08 Process and device for the doffing and the measuring with continuous adjustment of the weft thread in a loom Withdrawn EP0020392A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE2839454 1978-09-11
DE19782839454 DE2839454A1 (en) 1978-09-11 1978-09-11 Weft drawing=off drums - have conical shape with yarn guides located radially round them
DE19792906569 DE2906569A1 (en) 1979-02-21 1979-02-21 Weft yarns are doffed and measured continuously in variable manner - by winding yarn sections about frusto=conical cylinder and array of yarn guides
DE2906569 1979-02-21

Publications (1)

Publication Number Publication Date
EP0020392A1 true EP0020392A1 (en) 1981-01-07

Family

ID=25775680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79901081A Withdrawn EP0020392A1 (en) 1978-09-11 1980-04-08 Process and device for the doffing and the measuring with continuous adjustment of the weft thread in a loom

Country Status (3)

Country Link
EP (1) EP0020392A1 (en)
IT (1) IT7925458A0 (en)
WO (1) WO1980000577A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH635146A5 (en) * 1979-03-01 1983-03-15 Sulzer Ag DEVICE FOR MEASURING THREAD-SHAPED MATERIAL.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1535621A1 (en) * 1963-02-06 1969-09-11 Hifumi Saito Weaving machines
US3325073A (en) * 1965-12-28 1967-06-13 Elitex Zavody Textilniho Thread measuring device
DE1911735B2 (en) * 1968-10-14 1971-11-11 THREAD MEMORY AND DELIVERY DEVICE
DE2301416A1 (en) * 1973-01-12 1974-07-25 Fouquet Werk Frauz & Planck THREAD DELIVERY DEVICE FOR TEXTILE MACHINERY

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8000577A1 *

Also Published As

Publication number Publication date
WO1980000577A1 (en) 1980-04-03
IT7925458A0 (en) 1979-09-04

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