EP0635590A2 - Double-apron drafting device - Google Patents

Double-apron drafting device Download PDF

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Publication number
EP0635590A2
EP0635590A2 EP94110436A EP94110436A EP0635590A2 EP 0635590 A2 EP0635590 A2 EP 0635590A2 EP 94110436 A EP94110436 A EP 94110436A EP 94110436 A EP94110436 A EP 94110436A EP 0635590 A2 EP0635590 A2 EP 0635590A2
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EP
European Patent Office
Prior art keywords
apron
pair
drafting system
double
suction
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.)
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Application number
EP94110436A
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German (de)
French (fr)
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EP0635590B2 (en
EP0635590A3 (en
EP0635590B1 (en
Inventor
Peter Dr.-Ing. Artzt
Martin Dipl.-Ing. Conzelmann (Fh)
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Deutsche Institute fuer Textil und Faserforschung Stuttgart
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Itv -Institut fur Textil-Und Verfahrenstechnik
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Application filed by Itv -Institut fur Textil-Und Verfahrenstechnik filed Critical Itv -Institut fur Textil-Und Verfahrenstechnik
Priority to DE9422313U priority Critical patent/DE9422313U1/en
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    • 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
    • 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
    • D01H1/02—Spinning or twisting machines in which the product is wound-up continuously ring type
    • D01H1/025—Spinning or twisting machines in which the product is wound-up continuously ring type with a condensing device between drafting system and spinning unit
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/70—Constructional features of drafting elements
    • D01H5/72—Fibre-condensing guides

Definitions

  • the invention relates to a double apron drafting system for spinning machines with a fiber bundling zone which connects to the pair of output rollers of the main drafting zone and which follows the pair of delivery rollers.
  • a further pair of aprons running around the pair of output rollers is arranged in the fiber bundling zone, which leads the fiber assembly emerging from the pair of output rollers directly into the pair of delivery rollers and its bottom apron via the bottom rollers of the pair of output rollers and of the pair of delivery rollers running.
  • the top roller of the pair of delivery rollers has suction openings arranged in a ring.
  • the object of the present invention is to avoid these disadvantages of the prior art and to improve both the warpage and the bundling in such a way that no spinning triangle is formed, but also the fibers are not confused during the combination.
  • the suction air flow takes up only about the width of the desired summary, whereby a cross flow acts on the fiber structure (FB) as long as it is wider than the suction air flow. Because the fiber structure (FB) is on an air flow. Because the fiber structure (FB) is exposed to only a suction air flow on a largely flat transport surface, the fibers can be combined in their parallel position without hindrance, without confusing them. It has been shown that a very good compression of the fibers is achieved in this way, so that there is no spinning triangle at the outlet from the pair of delivery rollers and the yarn values, but also the spinning speed, are improved to a considerable extent.
  • the ratio of the peripheral speed of the pair of output rollers and the pair of delivery rollers is adapted to the crimping of the fiber material. If the fiber material is under too much tension, the fibers will be prevented from gathering together. On the other hand, the tension required for the transport speed must be present in order to ensure that the fiber structure is transported properly.
  • the suction device is expediently arranged above the transport plane above the sliver, so that air is sucked in from the space below the fiber assembly. This results in simple construction and good accessibility to the drafting system, so that the apron can also be exchanged without further assembly.
  • the compacting device expediently has a perforated apron which is guided around the delivery roller and extends parallel to the fiber structure right up to the pair of exit rollers. With this arrangement, the fiber structure emerging from the pair of output rollers is taken over and combined immediately, but at the same time also guided through the apron.
  • the apron has openings arranged in the middle of the running direction, which determine the combination of the fiber structure into a fiber ribbon. It is therefore advisable to choose the size of the perforation depending on the spun yarn number.
  • the adjustability of the apron in its height in relation to the pair of output rollers enables the distance to the pair of output rollers to be changed. A height-adjustable support is expediently provided for this.
  • the strap tension can be adjusted so that the strap is detached from the pressure roller in the exit area.
  • this can also be done in that the delivery roller wrapped in the straps has a free space in the form of a groove, so that fibers sucked in by the perforation cannot be clamped between the roller surface and the straps.
  • a drafting device for pulling up a nonwoven fabric on a spinning machine which has a compression part with a perforated belt.
  • the running belt runs at a considerably lower speed than the separating roller upstream of the running belt, this is a fiber collecting surface on which the fibers separated by the separating roller are collected into a sliver. Compression takes place in the transport direction, while in the subject matter of the invention a finished sliver emerging from the pair of output rollers of the double apron drafting system is compressed transversely to the transport direction.
  • the known device both in terms of its structure and its mode of operation, cannot be compared with the subject of the application.
  • the double apron drafting system consists in the usual way of the first pair of rollers 1 and 1 ', to which the fiber sliver FB is fed by a compressor 10. Between the first pair of rollers 1 and 1 'and the second pair of rollers 2, the sliver undergoes a preliminary draft. Before entering the second pair of rollers 2, 2 ', the sliver is combined by a further compressor 11. The main draft occurs between the second pair of rollers 2, 2 'and the pair of output rollers 3 and 3', in which the sliver is guided through the straps 4 and 4 '.
  • the upper apron 4 is usually tensioned by an apron cage 41, while the lower apron 4 'runs over a rail 42 which also serves to support the upper apron.
  • the warping of the sliver has ended.
  • a fiber bundling zone in which the fully warped fiber assembly FB emerging from the pair of output rollers is combined transversely to the direction of transport, so that no spinning triangle when exiting from the pair of delivery rollers 5, 5 ' arises when the fiber structure is twisted into thread F.
  • the fiber structure (FB) runs through an essentially flat section between the output roller pair 3, 3 'and the delivery roller pair 5, 5'.
  • the transport plane is formed by a perforated strap 6, which supports the fiber structure (FB) on one side.
  • a suction device is arranged between the pair of output rollers 3, 3 'and the pair of delivery rollers 5, 5', from which a suction air stream emanates, which acts on the fiber structure (FB) through the transport plane formed by the perforated strap 6 by the fiber structure (FB ) air is sucked in from the space below the fiber structure (FB).
  • the width of the suction air flow is determined by the perforation of the straps. It corresponds to the width to which the fiber structure (FB) is to be combined.
  • the perforated strap 6 is guided around the delivery roller 5 and extends counter to the transport direction into the nip of the pair of output rollers 3, 3 '.
  • the strapping 6 is guided by a strapping cage 62 known per se, which is designed as a suction device.
  • the space enclosed by the straps 6 and the delivery roller 5 is laterally closed in order to make the suction effect through the perforation 61 of the straps 6 more effective.
  • the strappy cage 62 is expediently designed as a housing, which is connected via a line 67 to a central vacuum device.
  • a central suction channel 69 is provided, which is arranged in the machine frame below the lower cylinders 3 'and 5'.
  • This central suction channel 69 extends over all drafting systems, with a connecting piece 68 being provided for each drafting system, into which the suction line 67 opens.
  • the nozzle 68 and the suction line 67 are connected to one another by a plug-in coupling, so that when the upper rollers 3, 5 are lifted up, the suction line 67 can be separated from the nozzle 68.
  • a coupling with the connector 68 then takes place again.
  • this enclosed space is designed as a groove 66, which is closed towards the delivery roller 5, so that no suction effect can occur there.
  • the groove 66 is open at the front end of the cage, however, so that the deflection of the strap 6 projecting into the nip of the pair of output rollers 3, 3 'is also vacuumed.
  • the width of the groove 66 is expediently matched to the largest possible width of the strap perforation 61, so that there is always perfect suction and guidance of the strap chens 6 takes place.
  • the underside of the strappy cage 62 can also be slightly curved in the longitudinal direction.
  • the position of the apron 6 relative to the nip of the pair of output rollers 3, 3 ' is adjusted by a support 7 which is adjustable.
  • a support 7 which is adjustable.
  • This inclination adjustment of the apron 6 with the apron cage 62 can also be carried out, as is customary in the case of drafting systems, by means of clips which are each used for a specific inclination.
  • Fig. 1 by lowering the strappy cage 62, the distance to the lower exit roller 3 'becomes smaller. However, the distance must still be so large that the emerging fiber structure FB between the apron 6 and the output roller 3 'can pass through unhindered.
  • this area is also sucked through the suction device 62.
  • This has the advantage that the fibers emerging from the nip line of the output roller pair 3, 3 'are immediately sucked in and passed onto the apron 6.
  • this suction prevents the formation of coils on the output roller 3.
  • the ratio of the peripheral speeds between the output roller pair 3, 3 'and the delivery roller pair 5, 5' can be adjusted so that there is little lead or trailing arises.
  • the length of the fiber bundling zone is determined by the distance between the pair of output rollers 3, 3 'and the pair of delivery rollers 5, 5'. It is approximately equal to the distance between the roller pairs 2, 2 'and 3, 3' in the main drafting zone. As a rule, a clamping line spacing of approximately 1 1/2 times the fiber length is sufficient.
  • the length of the suction air flow is shorter. To reduce air consumption, it is sufficient if the suction air flow is effective at most half way. A longer length does not bring any better success with regard to the mating in the fiber bundling zone.
  • the output roller pair 3, 3 'and the delivery roller pair 5, 5' run at approximately the same peripheral speed, or with a slight, depending on the fiber material and the transport speed tension delay, as described above.
  • the strap 6 could of course also wrap around the lower delivery roller 5 'so that the fiber structure FB rests on the strap 6.
  • the arrangement above the transport level with the wrapping of the upper delivery roller 5 has the advantage, however, that the strap 6 can be easily replaced, since the top rollers 5 are overhung on the loading arm of the drafting system.
  • the space under the apron 6, or on the opposite side of the transport plane, is free, so that the fibers which are only guided on one side move freely and can be combined unhindered by the air flow transversely to the transport direction.
  • the apron cage 62 which is designed as a suction device, is fastened to a support 63 with elongated holes 65.
  • the carrier 63 is mounted on the axis of the delivery roller 5 and expediently also contains the suction line 67 with which the strappy cage 62 is connected to a vacuum device.
  • the strap 6 is therefore expediently made of a material which has a greater elasticity than is normally the case with straps which are used in drafting systems. Such greater elasticity can already be achieved, for example, if the straps used in the fiber bundling zone have no fabric insert.
  • This release of the fibers can also be achieved in another way, for example in that the delivery roller 5 has a free space in the form of an annular groove 51 in the area of the perforation of the apron (FIG. 5). This also prevents sucked-in fibers from being pinched between the apron 6 and the top roller 5 and leading to malfunctions in the formation of the thread. Standard straps with fabric inlay can be used with this version. Even at high delivery speeds, this leads to a significant improvement in the yarn values.
  • the lifting effect described above can also be achieved, for example, regardless of the choice of material for the strap 6, in that the strap 6 is braked in the returning run according to the clamping line of the pair of delivery rollers 6, 6 '. This can be done in a simple manner by placing a leaf spring or the like (not shown).
  • the apron 6 therefore has openings 61 arranged in the center of the running direction, through which the suction air flow passes. If a coarse thread number is spun, the fiber structure to be combined is wider.
  • the size of the perforation 61 is therefore chosen somewhat larger transversely to the direction of transport than in the case of fine yarns, where it is important to summarize the fiber structure more closely in order to avoid the spinning triangle. In the direction of transport, the distance between the perforation holes 61 and their size should be selected so that sucking in fiber ends is avoided as far as possible.
  • the compression can also be influenced by the negative pressure.
  • a desired compression can be achieved, so that in extreme cases the choice of vacuum can be used with or without a spinning triangle. In this way, the yarn properties can be influenced, such as. B. Hairiness u. ⁇ .
  • the method according to the invention is also particularly suitable for the production of core yarns.
  • an endless thread E for example a filament, is introduced directly into the pair of output rollers 3, 3 'of the drafting system.
  • This thread E together with the fiber bundle (FB), passes through the fiber bundling zone between the pair of output rollers 3, 3 'and the pair of delivery rollers 5, 5', in which the fibers are already placed on the continuous thread by the combination and then when leaving the pair of delivery rollers 5, 5 ' are twisted together to form a core yarn (EF) (FIG. 5).
  • EF core yarn
  • a cleaning opening 70 is provided on the underside of the strappy cage 62. This cleaning opening 70 extends transversely to the suction groove 66 across the width of the apron 6. The cleaning opening 70 is closed at both ends, so that the suction effect occurs only with respect to the inside of the apron 6.

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

Abstract

In a double-apron drawframe for spinning machines with a fibre-bundling zone which follows the pair of withdrawal rollers of the main drawing zone and which is followed by the pair of delivery rollers, during the amalgamation the fibre composite (FB) runs through an essentially plane stage, in which the fibre composite is supported on one side by a transport plane and a suction-air stream acts on the fibre composite (FB) through this transport plane approximately in the width of the desired amalgamation. The drawframe has, between the pair of withdrawal rollers and the pair of delivery rollers, a pneumatic compacting device formed by a perforated apron which is at the same time the transport plane for the fibre composite and which is subjected to suction by a suck-off device.

Description

Die Erfindung betrifft ein Doppelriemchen-Streckwerk für Spinnereimaschinen mit einer Faserbündelungszone, die sich dem Ausgangswalzenpaar des Hauptverzugsfeldes anschließt und der das Lieferwalzenpaar folgt. Bei diesem bekannten Streckwerk (DE-A1-41 39 067) ist in der Faserbündelungszone ein um das Ausgangswalzenpaar laufendes weiteres Riemchenpaar angeordnet, das den aus dem Ausgangswalzenpaar austretenden Faserverband unmittelbar in das Lieferwalzenpaar leitet und dessen Unterriemchen über die Unterwalzen des Ausgangswalzenpaares als auch des Lieferwalzenpaares läuft. Die Oberwalze des Lieferwalzenpaares weist ringförmig angeordnete Saugöffnungen auf. Auf diese Weise sollen gegenüber bekannten Streckwerken mehr Fasern gebündelt und verdichtet werden, so daß im Lieferwalzenpaar fast alle Fasern zusammengefaßt und verdichtet sind, so daß kein sog. Spinndreieck entsteht.The invention relates to a double apron drafting system for spinning machines with a fiber bundling zone which connects to the pair of output rollers of the main drafting zone and which follows the pair of delivery rollers. In this known drafting system (DE-A1-41 39 067), a further pair of aprons running around the pair of output rollers is arranged in the fiber bundling zone, which leads the fiber assembly emerging from the pair of output rollers directly into the pair of delivery rollers and its bottom apron via the bottom rollers of the pair of output rollers and of the pair of delivery rollers running. The top roller of the pair of delivery rollers has suction openings arranged in a ring. In this way, compared to known drafting systems, more fibers are to be bundled and compacted, so that almost all of the fibers in the pair of delivery rollers are combined and compacted, so that no so-called spinning triangle is formed.

Es hatsich gezeigt, daß diese Vorrichtung nurteilweise befriedigend arbeitet. Dadurch daßdasAusgangswalzenpaar beidseitig mit einem Riemchen umgeben ist, müssen sehr hohe Drücke angewandt werden, um einen einwandfreien Verzugsklemmpunkt zu erreichen. Dies ist wiederum für die mit hoher Geschwindigkeit laufenden Riemchen von Nachteil, da diese wegen der hohen Beanspruchung einem starkeren Verschleiß ausgesetzt sind. Aber auch die zusammenfassung und Bündelung der Fasern erfolgt nur mangelhaft. Es konnte festgestellt werden, daß durch die Doppelriemchenführung des aus dem Ausgangswalzenpaar austretenden Faserbandes eine Zusammenfassung und Bündelung erst unmittelbar im Eintrittsnip des Lieferwalzenpaares durch die Saugzone der Oberwalze des Lieferwalzenpaares erfolgt. Da die Fasern bei dieser Zusammenfassung stark umgelenkt werden, folgen sie dieser Umlenkung nur teilweise, was eine unvollständige Bündelung bewirkt. Außerdem ist bei der bekannten Vorrichtung durch die Erstreckung des Unterriemchens über die Ausgangswalze und Lieferwalze kein Anspannungsverzug möglich.It has been shown that this device works only partially satisfactorily. Because the pair of exit rollers is surrounded by a strap on both sides, very high pressures have to be used in order to achieve a perfect distortion clamping point. This, in turn, is disadvantageous for the straps running at high speed, since they are exposed to greater wear due to the high stress. However, the fibers are not collected and bundled properly either. It was found that the double sliver guide of the fiber sliver emerging from the pair of output rollers only combined and bundled directly in the inlet nip of the pair of delivery rollers through the suction zone of the top roller of the pair of delivery rollers. Since the fibers are strongly deflected in this combination, they only partially follow this deflection, which leads to incomplete bundling. In addition, no tension delay is possible in the known device due to the extension of the lower apron over the exit roller and delivery roller.

Durch die DE-39 27 936 C1 ist es bekannt, ein fertigverzogenes Faserband im Anschluß an den Verzug in einer Faserbündelungszone zusammenzufassen. Am Streckwerksausgang ist hierfür eine Umlenkstrecke vorgesehen, die durch die untere Austrittswalze gebildet wird. In dem Bereich zwischen dem Klemmspalt und der nachfolgenden Andrückrolle, die ebenfalls mit dieser Austrittswalze zusammenarbeitet, ist die Austrittswalze mit einer Saugzone für die verstreckte Faserlunte versehen, in deren Bereich eine Blaseinrichtung mit einer Strömungskomponente quer zur Saugzone angeordnet ist. Die Faserbündelung erfolgt durch diesen Blasluftstrom, während die Saugzone nur die Aufgabe hat, die Blasluft wegzubefördern. Es hat sich gezeigt, daß sowohl die Umlenkung als auch die Blasluft einen negativen Einfluß auf die Fasern bei der Zusammenfassung ausüben, so daß nicht die erstrebten besseren Garnwerte erzielt werden.From DE-39 27 936 C1 it is known to combine a fully drawn fiber sliver in a fiber bundling zone following the draft. For this purpose, a deflection section is provided at the drafting system exit, which is formed by the lower exit roller. In the area between the nip and the subsequent pressure roller, which also works with this exit roller, the exit roller is provided with a suction zone for the drawn fiber sliver, in the area of which a blowing device with a flow component is arranged transversely to the suction zone. The fiber bundling takes place through this blown air flow, while the suction zone only has the task of conveying the blown air away. It has been shown that both the deflection and the blown air have a negative influence on the fibers during the combination, so that the desired better yarn values are not achieved.

Aufgabe der vorliegenden Erfindung ist es, diese Nachteile des Standes der Technik zu vermeiden und sowohl den Verzug als auch die Bündelung so zu verbessern, daß kein Spinndreieck entsteht, aber auch nicht die Fasern bei der Zusammenfassung verwirrt werden.The object of the present invention is to avoid these disadvantages of the prior art and to improve both the warpage and the bundling in such a way that no spinning triangle is formed, but also the fibers are not confused during the combination.

Diese Aufgabe wird gemäß den Merkmalen des Anspruchs 1 gelöst. Der Saugluftstrom nimmt nur etwa die Breite der gewünschten Zusammenfassung ein, wodurch eine Querströmung auf den Faserverband (FB) einwirkt, solange dieser breiter als der Saugluftstrom ist. Dadurch, daß der Faserverband (FB) auf einer luftstrom ist. Dadurch, daß der Faserverband (FB) auf einerweitgehend ebenen Transportfläche nur einem Saugluftstrom ausgesetzt ist, können die Fasern ungehindert in ihrer Parallellage zusammengefaßt werden, ohne sie dabei zu verwirren. Es hat sich gezeigt, daß auf diese Weise eine sehr gute Verdichtung der Fasern erreicht wird, so daß kein Spinndreieck beim Auslauf aus dem Lieferwalzenpaar entsteht und die Garnwerte, aber auch die Spinngeschwindigkeit in erheblichem Maße verbessert werden.This object is achieved according to the features of claim 1. The suction air flow takes up only about the width of the desired summary, whereby a cross flow acts on the fiber structure (FB) as long as it is wider than the suction air flow. Because the fiber structure (FB) is on an air flow. Because the fiber structure (FB) is exposed to only a suction air flow on a largely flat transport surface, the fibers can be combined in their parallel position without hindrance, without confusing them. It has been shown that a very good compression of the fibers is achieved in this way, so that there is no spinning triangle at the outlet from the pair of delivery rollers and the yarn values, but also the spinning speed, are improved to a considerable extent.

Während der zusammenfassung des Faserverbandes wird das Verhältnis der Umfangsgeschwindigkeit von Ausgangswalzenpaar und Lieferwalzenpaar der Kräuselung des Fasermaterials angepaßt. Steht das Fasermaterial unter zu starker Anspannung, so wird ein Zusammenfassen der Fasern beeinträchtigt. Andererseits muß die für die Transportgeschwindigkeit notwendige Anspannung vorhanden sein, um einen einwandfreien Transport des Faserverbandes zu gewährleisten.During the summary of the fiber structure, the ratio of the peripheral speed of the pair of output rollers and the pair of delivery rollers is adapted to the crimping of the fiber material. If the fiber material is under too much tension, the fibers will be prevented from gathering together. On the other hand, the tension required for the transport speed must be present in order to ensure that the fiber structure is transported properly.

Die Absaugeinrichtung ist zweckmäßig oberhalb der Transportebene über dem Faserband angeordnet, so daß aus dem Raum unterhalb des Faserverbandes Luft angesaugt wird. Dadurch wird ein einfacherAufbau und eine gute Zugänglichkeit des Streckwerkes erreicht, so daß auch der Riemchenaustausch ohne weitere Montagen möglich ist.The suction device is expediently arranged above the transport plane above the sliver, so that air is sucked in from the space below the fiber assembly. This results in simple construction and good accessibility to the drafting system, so that the apron can also be exchanged without further assembly.

Die Verdichtungseinrichtung weist zweckmäßig ein um die Lieferwalze geführtes perforiertes Riemchen auf, das sich parallel zum Faserverband bis dicht vor das Ausgangswalzenpaar erstreckt. Durch diese Anordnung wird der aus dem Ausgangswalzenpaar austretende Faserverband unmittelbar übernommen und zusammengefaßt, jedoch gleichzeitig auch durch das Riemchen geführt. Das Riemchen weist mittig zur Laufrichtung angeordnet Durchbrechungen auf, die die Zusammenfassung des Faserverbandes zu einem Faserbändchen bestimmen. Zweckmäßig wird deshalb die Größe der Perforation in Abhängigkeit zur gesponnenen Garnnummer gewählt. Die Verstellbarkeit des Riemchens in seiner Höhe zum Ausgangswalzenpaar ermöglicht eine Veränderung des Abstandes zum Ausgangswalzenpaar. Hierfür ist zweckmäßig eine in der Höhe verstellbare Abstützung vorgesehen.The compacting device expediently has a perforated apron which is guided around the delivery roller and extends parallel to the fiber structure right up to the pair of exit rollers. With this arrangement, the fiber structure emerging from the pair of output rollers is taken over and combined immediately, but at the same time also guided through the apron. The apron has openings arranged in the middle of the running direction, which determine the combination of the fiber structure into a fiber ribbon. It is therefore advisable to choose the size of the perforation depending on the spun yarn number. The adjustability of the apron in its height in relation to the pair of output rollers enables the distance to the pair of output rollers to be changed. A height-adjustable support is expediently provided for this.

Um ein Einklemmen der Fasern zwischen dem Oberriemchen und dem Druckroller im Bereich des Spinndreiecks zu vermeiden und damit auch die Einbindung der Fasern zu verbessern, ist die Riemchenspannung so einstellbar, daß es zu einer Ablösung des Riemchens vom Druckroller im Ausgangsbereich kommt. Alternativ kann dies allerdings auch dadurch erfolgen, daß die vom Riemchen umschlungene Lieferwalze einen Freiraum aufweist in Form einer Nut, so daß durch die Perforation eingesaugte Fasern nicht zwischen walzenoberfläche und Riemchen geklemmt werden können.In order to avoid pinching the fibers between the top apron and the pressure roller in the area of the spinning triangle and thus also to improve the integration of the fibers, the strap tension can be adjusted so that the strap is detached from the pressure roller in the exit area. Alternatively, however, this can also be done in that the delivery roller wrapped in the straps has a free space in the form of a groove, so that fibers sucked in by the perforation cannot be clamped between the roller surface and the straps.

Durch die DE-AS 1 039 422 ist zwar ein Streckwerk zum Hochverziehen eines Faservlieses an einer Spinnmaschine bekannt, welches einen Verdichtungsteil mit einem perforierten Laufriemchen aufweist. Da das Laufriemchen jedoch mit erheblich geringerer Geschwindigkeit als die dem Laufriemchen vorgeschaltete Vereinzelungswalze läuft, handelt es sich hier um eine Fasersammelfläche, auf welcher die durch die Vereinzelungswalze vereinzelten Fasern zu einer Lunte gesammelt werden. Es erfolgt eine Verdichtung in Transportrichtung, während beim Erfindungsgegenstand eine aus dem Ausgangswalzenpaar des Doppelriemchenstreckwerkes austretende fertige Lunte quer zur Transportrichtung verdichtet wird. Die bekannte Vorrichtung ist sowohl vom Aufbau wie ihrer Wirkungsweise mit dem Anmeldungsgegenstand nicht vergleichbar.From DE-AS 1 039 422, a drafting device for pulling up a nonwoven fabric on a spinning machine is known, which has a compression part with a perforated belt. However, since the running belt runs at a considerably lower speed than the separating roller upstream of the running belt, this is a fiber collecting surface on which the fibers separated by the separating roller are collected into a sliver. Compression takes place in the transport direction, while in the subject matter of the invention a finished sliver emerging from the pair of output rollers of the double apron drafting system is compressed transversely to the transport direction. The known device, both in terms of its structure and its mode of operation, cannot be compared with the subject of the application.

Weitere Einzelheiten der Erfindung werden anhand der Figuren beschrieben. Es zeigen:

  • Fig. 1: den Aufbau des erfindungsgemäßen Streckwerkes schematisch im Querschnitt,
  • Fig. 2: eine Draufsicht auf die Transportebene aus der Richtung unterhalb der Streckwerkszylinder,
  • Fig. 3: die verdichtungseinheit im Detail,
  • Fig. 4: eine weitere Einzelheit in perspektivischer Ansicht,
  • Fig. 5: eine andere Ausführung des erfindungsgemäßen Streckwerkes.
Further details of the invention are described with reference to the figures. Show it:
  • 1: the structure of the drafting system according to the invention schematically in cross section,
  • 2: a plan view of the transport plane from the direction below the drafting cylinders,
  • 3: the compression unit in detail,
  • 4: another detail in a perspective view,
  • Fig. 5: another embodiment of the drafting system according to the invention.

Das Doppelriemchenstreckwerk besteht in üblicher Weise aus dem ersten Walzenpaar 1 und 1', welchem das Faserband FB durch einen verdichter 10 zugeführt wird. Zwischen dem ersten Walzenpaar 1 und 1' und dem zweiten Walzenpaar 2 erfährt das Faserband einen Vorverzug. Vor dem Eintritt in das zweite Walzenpaar 2, 2' wird das Faserband durch einen weiteren Verdichter 11 zusammengefaßt. Zwischen dem zweiten Walzenpaar 2, 2' und dem Ausgangswalzenpaar 3 und 3' erfolgt der Hauptverzug, bei dem das Faserband durch die Riemchen 4 und 4' geführt werden. Das Oberriemchen 4 wird in üblicherweise durch einen Riemchenkäfig 41 gespannt, während das Unterriemchen 4' über eine Schiene 42 läuft, die gleichzeitig zur Abstützung des Oberriemchens dient. Am Ausgangswalzenpaar 3, 3' ist der Verzug des Faserbandes beendet. Zwischen dem Ausgangswalzenpaar 3, 3' und dem Lieferwalzenpaar 5, 5' schließt sich eine Faserbündelungszone an, in welcher der aus dem Ausgangswalzenpaar austretende fertig verzogene Faserverband FB quer zur Transportrichtung zusammengefaßt wird, so daß beim Austritt aus dem Lieferwalzenpaar 5, 5' kein Spinndreieck entsteht, wenn der Faserverband zum Faden F zusammengedreht wird.The double apron drafting system consists in the usual way of the first pair of rollers 1 and 1 ', to which the fiber sliver FB is fed by a compressor 10. Between the first pair of rollers 1 and 1 'and the second pair of rollers 2, the sliver undergoes a preliminary draft. Before entering the second pair of rollers 2, 2 ', the sliver is combined by a further compressor 11. The main draft occurs between the second pair of rollers 2, 2 'and the pair of output rollers 3 and 3', in which the sliver is guided through the straps 4 and 4 '. The upper apron 4 is usually tensioned by an apron cage 41, while the lower apron 4 'runs over a rail 42 which also serves to support the upper apron. At the pair of output rollers 3, 3 ', the warping of the sliver has ended. Between the pair of output rollers 3, 3 'and the pair of delivery rollers 5, 5' is followed by a fiber bundling zone, in which the fully warped fiber assembly FB emerging from the pair of output rollers is combined transversely to the direction of transport, so that no spinning triangle when exiting from the pair of delivery rollers 5, 5 ' arises when the fiber structure is twisted into thread F.

Zwischen dem Ausgangswalzenpaar 3, 3' und dem Lieferwalzenpaar 5, 5' durchläuft der Faserverband (FB) eine im wesentlichen ebene Strecke. Die Transportebene wird durch ein perforiertes Riemchen 6 gebildet, das den Faserverband (FB) einseitig unterstützt. Zwischen dem Ausgangswalzenpaar 3, 3' und dem Lieferwalzenpaar 5, 5' ist eine Absaugeinrichtung angeordnet, von welcher ein Saugluftstrom ausgeht, der durch die von dem perforierten Riemchen 6 gebildeten Transportebene hindurch auf den Faserverband (FB) einwirkt, indem durch den Faserverband (FB) hindurch Luft aus dem Raum unterhalb des Faserverbandes (FB) angesaugt wird. Die Breite des Saugluftstromes ist durch die Perforation des Riemchens bestimmt. Sie entspricht der Breite, auf den der Faserverband (FB) zusammengefaßt werden soll.The fiber structure (FB) runs through an essentially flat section between the output roller pair 3, 3 'and the delivery roller pair 5, 5'. The transport plane is formed by a perforated strap 6, which supports the fiber structure (FB) on one side. A suction device is arranged between the pair of output rollers 3, 3 'and the pair of delivery rollers 5, 5', from which a suction air stream emanates, which acts on the fiber structure (FB) through the transport plane formed by the perforated strap 6 by the fiber structure (FB ) air is sucked in from the space below the fiber structure (FB). The width of the suction air flow is determined by the perforation of the straps. It corresponds to the width to which the fiber structure (FB) is to be combined.

Das perforierte Riemchen 6 ist um die Lieferwalze 5 geführt und erstreckt sich entgegen der Transportrichtung bis in den Nip des Ausgangswalzenpaares 3, 3'.The perforated strap 6 is guided around the delivery roller 5 and extends counter to the transport direction into the nip of the pair of output rollers 3, 3 '.

Die Führung des Riemchens 6 bewirkt ein an sich bekannter Riemchenkäfig 62, der als Absaugeinrichtung ausgebildet ist. Der von dem Riemchen 6 und der Lieferwalze 5 eingeschlossene Raum ist seitlich abgeschlossen, um die Saugwirkung durch die Perforation 61 des Riemchens 6 wirksamer zu gestalten. Zweckmäßig ist der Riemchenkäfig 62 als Gehäuse ausgebildet., das über eine Leitung 67 an eine zentrale Unterdruckeinrichtung angeschlossen ist.The strapping 6 is guided by a strapping cage 62 known per se, which is designed as a suction device. The space enclosed by the straps 6 and the delivery roller 5 is laterally closed in order to make the suction effect through the perforation 61 of the straps 6 more effective. The strappy cage 62 is expediently designed as a housing, which is connected via a line 67 to a central vacuum device.

Bei der Ausführung in Fig. 5 ist ein zentraler Absaugkanal 69 vorgesehen, der im Maschinengestellt unterhalb der Unterzylinder 3' und 5' angeordnet ist. Dieser zentrale Absaugkanal 69 erstreckt sich über sämtliche Streckwerke, wobei für jedes Streckwerk ein Stutzen 68 vorgesehen ist, in welchen die Absaugleitung 67 mündet. Der Stutzen 68 und die Absaugleitung 67 sind durch eine Steckkupplung miteinander verbunden, so daß beim Anheben der Oberwalzen 3, 5 die Absaugleitung 67 von dem Stutzen 68 trennbar ist. Beim Senken des Streckwerkarmes mit den Oberwalzen findet sodann wieder eine Kupplung mit dem Stutzen 68 statt.5, a central suction channel 69 is provided, which is arranged in the machine frame below the lower cylinders 3 'and 5'. This central suction channel 69 extends over all drafting systems, with a connecting piece 68 being provided for each drafting system, into which the suction line 67 opens. The nozzle 68 and the suction line 67 are connected to one another by a plug-in coupling, so that when the upper rollers 3, 5 are lifted up, the suction line 67 can be separated from the nozzle 68. When lowering the drafting arm with the upper rollers, a coupling with the connector 68 then takes place again.

Wie aus Fig. 4 ersichtlich ist dieser eingeschlossene Raum als Nut 66 ausgebildet, die zur Lieferwalze 5 hin geschlossen ist, so daß keine Saugwirkung dort eintreten kann. Die Nut 66 ist am vorderen Ende des Käfigs jedoch offen, so daß die in den Nip des Ausgangswalzenpaares 3, 3' hineinragende Umlenkung des Riemchens 6 ebenfalls besaugt wird. Die Breite der Nut 66 ist zweckmäßig auf die größte in Frage kommende Breite der Riemchen-Perforation 61 abgestimmt, damit stets eine einwandfreie Besaugung und Führung des Riemchens 6 erfolgt. Zur besseren Auflage und damit Abdichtung der Nut 66 kann die Unterseite des Riemchenkäfigs 62 in Längsrichtung auch leicht gewölbt sein.As can be seen from FIG. 4, this enclosed space is designed as a groove 66, which is closed towards the delivery roller 5, so that no suction effect can occur there. The groove 66 is open at the front end of the cage, however, so that the deflection of the strap 6 projecting into the nip of the pair of output rollers 3, 3 'is also vacuumed. The width of the groove 66 is expediently matched to the largest possible width of the strap perforation 61, so that there is always perfect suction and guidance of the strap chens 6 takes place. For better support and thus sealing of the groove 66, the underside of the strappy cage 62 can also be slightly curved in the longitudinal direction.

Durch eine Abstützung 7, die verstellbar ist, wird die Lage des Riemchens 6 zum Nip des Ausgangswalzenpaares 3, 3' eingestellt. Durch eine Veränderung der Neigung des Riemchens 6 zusammen mit dem Riemchenkäfig 62 wird der Abstand zwischen dem Ausgangswalzenpaar 3, 3' und damit der Beginn der Verdichtung eingestellt. Diese Neigungseinstellung des Riemchens 6 mit dem Riemchenkäfig 62 kann auch wie bei Streckwerken üblich durch Klipse erfolgen, die jeweils für eine bestimmte Neigung eingesetzt werden. Wie aus Fig. 1 ersichtlich, wird durch Absenken des Riemchenkäfigs 62 derAbstand zur unteren Ausgangswalze 3' geringer. Jedoch muß der Abstand noch so groß sein, daß der austretende Faserverband FB zwischen Riemchen 6 und Ausgangswalze 3' ungehindert hindurchtreten kann.The position of the apron 6 relative to the nip of the pair of output rollers 3, 3 'is adjusted by a support 7 which is adjustable. By changing the inclination of the apron 6 together with the apron cage 62, the distance between the pair of output rollers 3, 3 'and thus the start of the compression is set. This inclination adjustment of the apron 6 with the apron cage 62 can also be carried out, as is customary in the case of drafting systems, by means of clips which are each used for a specific inclination. As can be seen from Fig. 1, by lowering the strappy cage 62, the distance to the lower exit roller 3 'becomes smaller. However, the distance must still be so large that the emerging fiber structure FB between the apron 6 and the output roller 3 'can pass through unhindered.

Die Wirkungsweise dieser Einrichtung ist folgende:

  • Der aus dem Ausgangswalzenpaar 3, 3' austretende Faserverband kommt sofort in den Bereich des Riemchens 6. Durch die in die Perforation 61 eintretende Saugluft wird der Faserverband FB auf das Riemchen 6 gesaugt. Dabei wird der Saugluftstrom durch die Perforation 61 gebündelt und übt entsprechende Kräfte auf die Fasern des Faserverbandes FB aus. Die Breite des Saugluftstromes wird durch die Breite der Perforation 61 bestimmt. Diese wird so gewählt, daß der Saugluftstrom bei seinem Eintritt in die Perforation 61 des Riemchens 6 die Breite der gewünschten Zusammenfassung hat. Es hat sich gezeigt, daß der Saugluftstrom nicht nur senkrecht zur Perforation 61 wirkt, sondern auch eine Querwirkung hat. Hierdurch erfolgt eine Zusammenfassung des Faserverbandes (FB) quer zur Transportrichtung. Die Zusammenfassung beginnt nach dem Austritt aus dem Ausgangswalzenpaar und kann sich ungehindert fortsetzen bis zum Eintritt in die Klemmlinie des Lieferwalzenpaares 5, 5', mindestens über die Länge des Saugluftstromes. Dadurch ist den Fasern genügend Zeit gegeben, sich während des Transportes in dieser Faserbündelungszone auf die durch die Perforation 61 gegebene Breite zu konzentrieren.
This device works as follows:
  • The fiber structure emerging from the pair of output rollers 3, 3 'immediately comes into the region of the apron 6. The fiber structure FB is sucked onto the apron 6 by the suction air entering the perforation 61. The suction air flow is bundled through the perforation 61 and exerts corresponding forces on the fibers of the fiber structure FB. The width of the suction air flow is determined by the width of the perforation 61. This is chosen so that the suction air flow has the width of the desired summary when it enters the perforation 61 of the straps 6. It has been shown that the suction air flow not only acts perpendicular to the perforation 61, but also has a transverse effect. This results in a summary of the fiber structure (FB) transverse to the direction of transport. The summary begins after the exit from the pair of output rollers and can continue unhindered until it enters the nip line of the pair of delivery rollers 5, 5 ', at least over the length of the suction air flow. This gives the fibers sufficient time to concentrate on the width given by the perforation 61 during transport in this fiber bundling zone.

Durch die zum Nip des Ausgangswalzenpaares 3, 3' offene Nut 66 wird auch dieser Bereich durch die Absaugeinrichtung 62 besaugt. Das hat den Vorteil, daß die aus der Klemmlinie des Ausgangswalzenpaares 3, 3' austretenden Fasern sofort angesaugt und auf das Riemchen 6 geleitet werden. Außerdem verhindert diese Besaugung eine Wickelbildung an der Ausgangswalze 3. Je nach dem wie stark das Fasermaterial gekräuselt ist, kann das Verhältnis der Umfangsgeschwindigkeiten zwischen Ausgangswalzenpaar 3, 3' und dem Lieferwalzenpaar 5, 5' angepaßt werden, so daß ein geringer Vor- oder Nachlauf entsteht. Dadurch kann vermieden werden, daß einerseits bei stark gekräuselten Fasern eine zu große Spannung auftritt, die das Zusammenfassen nachteilig beeinflußt, zum anderen, daß auch die für die Transportgeschwindigkeit notwendige Anspannung vorhanden ist, um einen einwandfreien Transport des Faserverbandes FB zu gewährleisten.Through the groove 66 open to the nip of the output roller pair 3, 3 ', this area is also sucked through the suction device 62. This has the advantage that the fibers emerging from the nip line of the output roller pair 3, 3 'are immediately sucked in and passed onto the apron 6. In addition, this suction prevents the formation of coils on the output roller 3. Depending on how much the fiber material is crimped, the ratio of the peripheral speeds between the output roller pair 3, 3 'and the delivery roller pair 5, 5' can be adjusted so that there is little lead or trailing arises. In this way it can be avoided that, on the one hand, too much tension occurs in the case of severely crimped fibers, which adversely affects the combination, and, on the other hand, that the tension required for the transport speed is also present in order to ensure proper transport of the fiber structure FB.

Die Länge der Faserbündelungszone wird durch den Abstand des Ausgangswalzenpaares 3, 3' und des Lieferwaizenpaares5, 5' bestimmt. Sie ist etwa gleich dem Abstand der Walzenpaare 2, 2' und 3, 3' im Hauptverzugsfeld. In der Regel genügt hierein Klemmlinienabstand von etwa der 1 1/2 fachen Faserlänge. Die Länge des Saugluftstromes ist geringer. Zur Verminderung des Luftverbrauches genügt es, wenn der Saugluftstrom höchstens auf der halben Strecke wirksam ist. Eine größere Länge bringt bezüglich der Zusammenfasung in der Faserbündelungszone keinen besseren Erfolg. Das Ausgangswalzenpaar 3, 3' und das Lieferwalzenpaar 5, 5' laufen mit etwa der gleichen Umfangsgeschwindigkeit, bzw. mit einem geringfügigen, vom Fasermaterial und von der Transportgeschwindigkeit abhängigen Anspannungsverzug, wie oben beschrieben.The length of the fiber bundling zone is determined by the distance between the pair of output rollers 3, 3 'and the pair of delivery rollers 5, 5'. It is approximately equal to the distance between the roller pairs 2, 2 'and 3, 3' in the main drafting zone. As a rule, a clamping line spacing of approximately 1 1/2 times the fiber length is sufficient. The length of the suction air flow is shorter. To reduce air consumption, it is sufficient if the suction air flow is effective at most half way. A longer length does not bring any better success with regard to the mating in the fiber bundling zone. The output roller pair 3, 3 'and the delivery roller pair 5, 5' run at approximately the same peripheral speed, or with a slight, depending on the fiber material and the transport speed tension delay, as described above.

Das Riemchen 6 könnte selbstverständlich auch die untere Lieferwalze 5' umschlingen, so daß der Faserverband FB auf dem Riemchen 6 aufliegt. Die Anordnung oberhalb der Transportebene mit der Umschlingung der oberen Lieferwalze 5 hat jedoch den Vorteil, daß das Riemchen 6 leicht ausgewechselt werden kann, da die Oberwalzen 5 am Belastungsarm des Streckwerkes fliegend gelagert sind. Der Raum unter dem Riemchen 6, bzw. auf der gegenüberliegenden Seite der Transportebene ist frei, so daß die nur einseitig geführten Fasern sich frei bewegen und ungehindert durch den Luftstrom quer zur Transportrichtung zusammengefaßt werden können.The strap 6 could of course also wrap around the lower delivery roller 5 'so that the fiber structure FB rests on the strap 6. The arrangement above the transport level with the wrapping of the upper delivery roller 5 has the advantage, however, that the strap 6 can be easily replaced, since the top rollers 5 are overhung on the loading arm of the drafting system. The space under the apron 6, or on the opposite side of the transport plane, is free, so that the fibers which are only guided on one side move freely and can be combined unhindered by the air flow transversely to the transport direction.

Durch den Saugluftstrom kommt es vor, daß Faserenden durch die Perforation 61 eingesaugt werden, die dann zwischen dem Riemchen 6 und der Oberwalze 5 eingeklemmt werden. Dies führt zu einer unliebsamen Störung, weil diese Fasern nicht der Richtung des zum Faden F zusammengedrehten Faserverbandes FB folgen können und aus diesem herausgezogen werden. Durch entsprechende Einstellung der Spannung des Riemchens 6 wird dieses auf der Auslaufseite locker und hebt sich von der Oberfläche der Lieferwalze 5 ab (in Fig. 1 angedeutet). Dadurch werden die in die Perforation 61 eingesaugten Faserenden freigegeben und können der Richtung des zum Faden F zusammengedrehten Faserverbandes folgen.Due to the suction air flow it happens that fiber ends are sucked through the perforation 61, which are then clamped between the straps 6 and the top roller 5. This leads to an unpleasant disturbance because these fibers cannot follow the direction of the fiber bundle FB twisted together to form the thread F and are pulled out of it. By appropriately adjusting the tension of the strappy 6, it becomes loose on the outlet side and stands out from the surface of the delivery roller 5 (indicated in FIG. 1). As a result, the fiber ends sucked into the perforation 61 are released and can follow the direction of the fiber structure twisted together to form the thread F.

Um die gewünschte Verstellung durchführen zu können, ist der als Absaugung ausgebildete Riemchenkäfig 62 an einem Träger 63 mit Langlöchern 65 befestigt. Der Träger 63 ist auf der Achse der Lieferwalze 5 gelagert und beinhaltet zweckmäßigerweise auch die Absaugleitung 67, mit welcher der Riemchenkäfig 62 an eine Unterdruckeinrichtung angeschlossen ist.In order to be able to carry out the desired adjustment, the apron cage 62, which is designed as a suction device, is fastened to a support 63 with elongated holes 65. The carrier 63 is mounted on the axis of the delivery roller 5 and expediently also contains the suction line 67 with which the strappy cage 62 is connected to a vacuum device.

Dieser Abhebeeffekt des Riemchens wird durch geeignete Auswahl des Materials, aus welchem das Riemchen hergestellt ist, unterstützt. Zweckmäßig ist deshalb das Riemchen 6 aus einem Material hergestellt, das eine größere Elastizität aufweist als dies normalerweise bei Riemchen, die in Streckwerken verwendet werden, der Fall ist. Eine solche größere Elastizität kann beispielsweise schon dadurch erreicht werden, daß die in der Faserbündelungszone eingesetzten Riemchen keine Gewebeeinlage aufweisen.This lifting effect of the apron is supported by a suitable selection of the material from which the apron is made. The strap 6 is therefore expediently made of a material which has a greater elasticity than is normally the case with straps which are used in drafting systems. Such greater elasticity can already be achieved, for example, if the straps used in the fiber bundling zone have no fabric insert.

Dieses Freigeben der Fasern kann auch noch auf andere Weise erreicht werden, beispielsweise dadurch, daß im Bereich der Perforation des Riemchens die Lieferwalze 5 einen Freiraum aufweist in Form einer Ringnut 51 (Fig. 5). Auch auf diese Weise wird verhindert, daß eingesaugte Fasern zwischen dem Riemchen 6 und der Oberwalze 5 eingeklemmt werden und zu Störungen bei der Fadenbildung führen. Bei dieserAusführung können übliche Riemchen mit Gewebeeinlage verwendet werden. Selbst bei hohen Liefergeschwindigkeiten führt dies zu einer wesentlichen Verbesserung der Garnwerte.This release of the fibers can also be achieved in another way, for example in that the delivery roller 5 has a free space in the form of an annular groove 51 in the area of the perforation of the apron (FIG. 5). This also prevents sucked-in fibers from being pinched between the apron 6 and the top roller 5 and leading to malfunctions in the formation of the thread. Standard straps with fabric inlay can be used with this version. Even at high delivery speeds, this leads to a significant improvement in the yarn values.

Der oben geschilderte Abhebeeffekt kann unabhängig von der Materialwahl für das Riemchen 6 beispielsweise auch dadurch erzielt werden, daß das Riemchen 6 nach der Klemmlinie des Lieferwalzenpaares 6, 6', im rücklaufenden Trum gebremst wird. Dies kann auf einfache Weise durch Auflegen einer Blattfeder oder dergleichen Weise erfolgen (nicht gezeigt).The lifting effect described above can also be achieved, for example, regardless of the choice of material for the strap 6, in that the strap 6 is braked in the returning run according to the clamping line of the pair of delivery rollers 6, 6 '. This can be done in a simple manner by placing a leaf spring or the like (not shown).

Wie weit quer zur Transportrichtung der Faserverband FB in der Faserbündelungszone zusammengefaßt wird, hängt weitgehend von der Größe der Perforation 61 ab. Das Riemchen 6 weist deshalb zur Laufrichtung mittig angeordnete Durchbrechungen 61 auf, durch die der Saugluftstrom hindurchtritt. Wird eine gröbere Garnnummer gesponnen, so ist der zusammenzufassende Faserverband breiter. Die Größe der Perforation 61 wird deshalb quer zur Transportrichtung etwas größer gewählt als bei feinen Garnen, wo es darauf ankommt zur Vermeidung des Spinndreieckes den Faserverband enger zusammenzufassen. In Transportrichtung ist der Abstand der Perforationslöcher 61 und deren Größe so zu wählen, daß ein Einsaugen von Faserenden möglichst vermieden wird. Hierfür hat sich als zweckmäßig erwiesen den Abstand der Perforationslöcher 61 in Transportrichtung etwa doppelt so groß zu machen als der Durchmesser der Perforationslöcher 61 ist. Zusätzlich kann die Verdichtung auch durch den Unterdruck beeinflußt werden. Je nach Einstellung des Unterdruckes kann eine gewünschte Verdichtung erreicht werden, so daß über die Wahl des Unterdruckes im Extremfall mit oder ohne Spinndreieck gearbeitet werden kann. Auf diese Weise können die Garneigenschaften beeinflußt werden, wie z. B. Haarigkeit u. ä.How far across the transport direction the fiber structure FB is combined in the fiber bundling zone largely depends on the size of the perforation 61. The apron 6 therefore has openings 61 arranged in the center of the running direction, through which the suction air flow passes. If a coarse thread number is spun, the fiber structure to be combined is wider. The size of the perforation 61 is therefore chosen somewhat larger transversely to the direction of transport than in the case of fine yarns, where it is important to summarize the fiber structure more closely in order to avoid the spinning triangle. In the direction of transport, the distance between the perforation holes 61 and their size should be selected so that sucking in fiber ends is avoided as far as possible. For this purpose, it has proven to be expedient to make the distance between the perforation holes 61 in the transport direction approximately twice as large as the diameter of the perforation holes 61. In addition, the compression can also be influenced by the negative pressure. Depending on the setting of the vacuum, a desired compression can be achieved, so that in extreme cases the choice of vacuum can be used with or without a spinning triangle. In this way, the yarn properties can be influenced, such as. B. Hairiness u. Ä.

Das erfindungsgemäße Verfahren eignet sich auch besonders gut zur Herstellung von Coregarnen. Hierfür wird ein Endlosfaden E, beispielsweise ein Filament, unmittelbar in das Ausgangswalzenpaar 3, 3' des Streckwerkes eingeleitet. Dieser Faden E durchläuft zusammen mit dem Faserverband (FB) die Faserbündelungszone zwischen dem Ausgangswalzenpaar 3, 3' und dem Lieferwalzenpaar 5, 5', in welcher die Fasern durch die Zusammenfassung bereits an den Endlosfaden angelegt und dann beim Verlasen des Liefewalzenpaares 5, 5' zu einem Coregarnfaden (EF) zusammengedreht werden (Fig. 5).The method according to the invention is also particularly suitable for the production of core yarns. For this purpose, an endless thread E, for example a filament, is introduced directly into the pair of output rollers 3, 3 'of the drafting system. This thread E, together with the fiber bundle (FB), passes through the fiber bundling zone between the pair of output rollers 3, 3 'and the pair of delivery rollers 5, 5', in which the fibers are already placed on the continuous thread by the combination and then when leaving the pair of delivery rollers 5, 5 ' are twisted together to form a core yarn (EF) (FIG. 5).

Bei dem Riemchen 6 kann es vorkommen, daß sich an der Innenseite Faserstaub und andere Verunreinigungen absetzen. Um hier eine automatische Reinigung des Riemchens 6 zu bewirken, ist eine Reinigungsöffnung 70 an der Unterseite des Riemchenkäfigs 62 vorgesehen. Diese Reinigungsöffnung 70 erstreckt sich quer zur Absaugnut 66 über die Breite des Riemchens 6. An ihren beiden Enden ist die Reinigungsöffnung 70 geschlossen, so daß die Saugwirkung nur gegenüber der Innenseite des Riemchens 6 auftritt.With the straps 6 it can happen that fiber dust and other impurities settle on the inside. In order to effect an automatic cleaning of the strappy 6 here, a cleaning opening 70 is provided on the underside of the strappy cage 62. This cleaning opening 70 extends transversely to the suction groove 66 across the width of the apron 6. The cleaning opening 70 is closed at both ends, so that the suction effect occurs only with respect to the inside of the apron 6.

Durch die erfindungsgemäße Zusammenfassung des Faserverbandes (FB) nach dem Verzug und die Vermeidung eines Spinndreieckes wird eine wesentlich höhere Substanzausnutzung bei der Fadenbildung erreicht. Zur Erzielung gleicher Festigkeit wie bei dem Spinnen mit Spinndreieck kann die Drehung erheblich heruntergesetzt werden. Dies bedeutet eine Erhöhung der Produktivität pro Spindel um etwa 20% bis 30%.By combining the fiber structure (FB) according to the invention after the warping and avoiding a spinning triangle, a substantially higher substance utilization is achieved in the formation of the thread. The rotation can be reduced considerably to achieve the same strength as in spinning with a spinning triangle. This means an increase in productivity per spindle of around 20% to 30%.

Claims (26)

1. Verfahren zur Bündelung eines in einem Doppelriemchen-Streckwerk fertig verzogenen Faserbandes (FB), das im Anschluß an den Verzug in einer Faserbündelungszone zusammengefaßt und zu einem Faden zusammengedreht wird, wobei der das Ausgangswalzenpaar des Streckwerkes verlassende Faserverband (FB) über die Länge der Faserbündelungszone einem quer zur Transportrichtung gerichteten Saugluftstrom ausgesetzt wird, dadurch gekennzeichnet, daß der Faserverband (FB) während der Zusammenfassung eine Strecke durchläuft, in welcher der Faserverband (FB) durch eine Transportebene (6) einseitig unterstützt wird, wobei der Saugluftstrom etwa in der Breite der gewünschten Zusammenfassung durch die Transportebene (6) hindurch allein auf den Faserverband (FB) einwirkt.1. A method of bundling a fiber strip (FB) which has already been drawn in a double apron drafting system and which, following the warping, is combined in a fiber bundling zone and twisted into a thread, the fiber assembly (FB) leaving the pair of output rollers of the drafting system extending over the length of the The fiber bundling zone is exposed to a suction air flow directed transversely to the transport direction, characterized in that the fiber assembly (FB) passes through a distance during the consolidation in which the fiber assembly (FB) is supported on one side by a transport plane (6), the suction air flow being approximately in width the desired summary acts through the transport plane (6) alone on the fiber structure (FB). 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß während der Zusammenfassung des Faserverbandes (FB) das Verhältnis der Umfangsgeschwindigkeiten von Ausgangswalzenpaar (3, 3') und Lieferwalzenpaar (5, 5') der Kräuselung des Fasermaterials angepaßt wird.2. The method according to claim 1, characterized in that during the combination of the fiber structure (FB) the ratio of the peripheral speeds of the pair of output rollers (3, 3 ') and Lie Ferwalzenpaar (5, 5 ') of the crimp of the fiber material is adjusted. 3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Geschwindigkeit der Transportebene (6) durch das Lieferwalzenpaar (5, 5') bestimmt wird.3. The method according to claim 2, characterized in that the speed of the transport plane (6) by the delivery roller pair (5, 5 ') is determined. 4. Verfahren nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Zusammenfassung des Faserverbandes (FB) durch Variation der Intensität des Saugluftstromes variiert wird.4. The method according to one or more of claims 1 to 3, characterized in that the combination of the fiber structure (FB) is varied by varying the intensity of the suction air flow. 5. Verfahren nach einem oder mehreren derAnsprüche 1-4, dadurch gekennzeichnet, daß zur Herstellung eines Coregarnes unmittelbar in das Ausgangswalzenpaar (3, 3') ein Endlos-Faden (E) eingeführt wird, der zusammen mit dem Faserverband (FB) die Strecke zwischen Ausgangswalzenpaar (3, 3') und Lieferwalzenpaar (5, 5') durchläuft und anschließend zu einem Garn (EF) versponnen wird.5. The method according to one or more of claims 1-4, characterized in that for the production of a core yarn an endless thread (E) is introduced directly into the pair of output rollers (3, 3 '), which together with the fiber structure (FB) the route between output roller pair (3, 3 ') and delivery roller pair (5, 5') and then spun into a yarn (EF). 6. Doppelriemchen-Streckwerk für Spinnereimaschinen zur Durchführung des Verfahrens nach einem oder mehreren der Ansprüche 1 bis 5 mit einer Faserbündelungszone, die sich dem Ausgangswalzenpaar des Hauptverzugsfeldes anschließt und der ein Lieferwalzenpaar folgt, wobei zwischen dem Ausgangswalzenpaarund dem Lieferwalzenpaareine pneumatische Verdichtungseinrichtung angeordnet ist, dadurch gekennzeichnet, daß die pneumatische Verdichtungseinrichtung ein perforiertes Riemchen (6) aufweist, das die Transportebene für den Faserverband (FB) zwischen dem Ausgangswalzenpaar (3, 3') und dem Lieferwalzenpaar (5, 5') bildet, und daß die Verdichtungseinrichtung ferner eine Absaugvorrichtung (62, 67) aufweist, die sich einseitig zu der durch das perforierte Riemchen (6) gebildeten Transportebene zwischen dem Ausgangswalzenpaar (3, 3') und dem Lieferwalzenpaar (5, 5') erstreckt und durch den Faserverband (FB) hindurch Luft ansaugt.Double apron drafting system for spinning machines for carrying out the method according to one or more of claims 1 to 5 with a fiber bundling zone which adjoins the output roller pair of the main drafting zone and which follows a delivery roller pair, a pneumatic compression device being arranged between the output roller pair and the delivery roller pair, characterized in that that the pneumatic compacting device has a perforated strap (6) which forms the transport plane for the fiber structure (FB) between the pair of output rolls (3, 3 ') and the pair of supply rolls (5, 5'), and that the compacting device furthermore has a suction device ( 62, 67) which extends on one side to the transport plane formed by the perforated strap (6) between the pair of output rollers (3, 3 ') and the pair of delivery rollers (5, 5') and sucks air through the fiber structure (FB). 7. Doppelriemchen-Streckwerk nach Anspruch 6, dadurch gekennzeichnet, daß die Absaugeinrichtung (62, 67) oberhalb der Transportebene (6) des Faserverbandes (FB) im Bereich der Oberwalzen ((5, 3) angeordnet ist und aus dem Raum unterhalb des Faserverbandes (FB) Luft ansaugt.7. Double apron drafting system according to claim 6, characterized in that the suction device (62, 67) above the transport plane (6) of the fiber structure (FB) in the region of the top rollers ((5, 3) is arranged and from the space below the fiber structure (FB) Sucks in air. 8. Doppelriemchen-Streckwerk nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, daß das perforierte Riemchen (6) um den Lieferzylinder (5) geführt ist und sich parallel zu dem Faserverband (FB) bis dicht vor das Ausgangswalzenpaar (3, 3') erstreckt.8. Double apron drafting system according to one of claims 6 or 7, characterized in that the perforated apron (6) is guided around the delivery cylinder (5) and parallel to the fiber structure (FB) up to just before the pair of output rollers (3, 3 ' ) extends. 9. Doppelriemchen-Streckwerk nach Anspruch 8, dadurch gekennzeichnet, daß das Riemchen (6) zur Laufrichtung mittig angeordnete Durchbrechungen (61) aufweist, durch die der Saugluftstrom hindurchtritt.9. A double apron drafting system according to claim 8, characterized in that the apron (6) has openings (61) arranged centrally to the running direction, through which the suction air flow passes. 10. Doppelriemchen-Streckwerk nach einem der Ansprüche 8 oder 9, dadurch gekennzeichnet, daß die Größe der Durchbrechungen (61) in Abhängigkeit zur gesponnenen Garnnummer steht, so daß bei einer gröberen Garnnummer eine gröbere Perforation als bei einer feineren Garnnummer vorgesehen ist.10. Double apron drafting system according to one of claims 8 or 9, characterized in that the size of the openings (61) is dependent on the spun yarn number, so that a coarser perforation is provided for a coarser yarn number than for a finer yarn number. 11. Doppelriemchen-Streckwerk nach einem oder mehreren der Ansprüche 8 bis 10, dadurch gekennzeichnet, daß das Riemchen (6) aus einem Material besteht, das eine größere Elastizität aufweist als das für Streckfeldriemchen verwendete Material.11. Double apron drafting system according to one or more of claims 8 to 10, characterized in that the apron (6) consists of a material which has a greater elasticity than the material used for stretching field aprons. 12. Doppelriemchen-Streckwerk nach Anspruch 11, dadurch gekennzeichnet, daß das Riemchen (6) keine Gewebeeinlage enthält.12. Double apron drafting system according to claim 11, characterized in that the apron (6) contains no fabric insert. 13. Doppelriemchen-Streckwerk nach einem oder mehreren der Ansprüche 8 bis 12, dadurch gekennzeichnet, daß das Riemchen (6) in seiner Höhe zum Ausgangswalzenpaar (3, 3') verstellbar ist.13. Double apron drafting system according to one or more of claims 8 to 12, characterized in that the apron (6) is adjustable in height to the pair of output rollers (3, 3 '). 14. Doppelriemchen-Streckwerk nach Anspruch 13, gekennzeichnet durch eine in der Höhe verstellbare Abstützung (7).14. Double apron drafting system according to claim 13, characterized by a height-adjustable support (7). 15. Doppelriemchen-Streckwerk nach einem oder mehreren der Ansprüche 8 bis 14, dadurch gekennzeichnet, daß der von dem Riemchen (6) zwischen Ausgangswalzenpaar (3, 3') und Lieferzylinderpaar (5, 5') eingeschlossene Raum seitlich abgeschlossen und an eine Unterdruckeinrichtung angeschlossen ist.15. Double apron drafting system according to one or more of claims 8 to 14, characterized in that the space enclosed by the apron (6) between the pair of output rollers (3, 3 ') and the delivery cylinder pair (5, 5') is laterally closed and connected to a vacuum device connected. 16. Doppelriemchen-Streckwerk nach einem oder mehreren der Ansprüche 6 bis 15, dadurch gekennzeichnet, daß die Absaugeinrichtung (62, 67) einen gehäuseartigen Riemchenkäfig (62) aufweist, der den von dem Riemchen (6) zwischen Ausgangswalzenpaar (3, 3') und Lieferzylinderpaar (5, 5') eingeschlossenen Raum ausfüllt.16. Double apron drafting system according to one or more of claims 6 to 15, characterized in that the suction device (62, 67) has a housing-like apron cage (62), which of the apron (6) between the output roller pair (3, 3 ') and delivery cylinder pair (5, 5 ') included Fills up space. 17. Doppelriemchen-Streckwerk nach Anspruch 16, dadurch gekennzeichnet, daß der Riemchenkäfig (62) im Bereich der Riemchen-Perforation (61) eine Nut (66) aufweist, in die eine Absaugleitung (67) mündet.17. Double apron drafting system according to claim 16, characterized in that the apron cage (62) in the region of the apron perforation (61) has a groove (66) into which a suction line (67) opens. 18. Doppelriemchen-Streckwerk nach einem oder mehreren der Ansprüche 6 bis 17, dadurch gekennzeichnet, daß die Absaugeinrichtung (62, 67) gegenüber der Lieferwalze (5) abgeschlossen ist.18. Double apron drafting system according to one or more of claims 6 to 17, characterized in that the suction device (62, 67) with respect to the delivery roller (5) is completed. 19. Doppelriemchen-Streckwerk nach einem oder mehreren der Ansprüche 6 bis 18, dadurch gekennzeichnet, daß die Absaugeinrichtung (62, 67) gegenüber dem Nip des Ausgangswalzenpaares (5, 5') offen ist.19. Double apron drafting system according to one or more of claims 6 to 18, characterized in that the suction device (62, 67) with respect to the nip of the pair of output rollers (5, 5 ') is open. 20. Doppelriemchen-Streckwerk nach einem oder mehreren der Ansprüche 6 bis 19, dadurch gekennzeichnet, daß der Absaugeinrichtung (62, 67) eine Einrichtung zugeordnet ist zur Variierung des in derAbsaugeinrichtung wirksamen Saugluftstromes.20. Double apron drafting system according to one or more of claims 6 to 19, characterized in that the suction device (62, 67) is associated with a device for varying the suction air flow effective in the suction device. 21. Doppelriemchen-Streckwerk nach einem oder mehreren der Ansprüche 6 bis 20, dadurch gekennzeichnet, daß der Riemchenkäfig (62) eine Reinigungsöffnung (70) aufweist, die auf die Innenseite des Riemchens (6) gerichtet und an eine Absaugleitung (67) angeschlossen ist.21. Double apron drafting system according to one or more of claims 6 to 20, characterized in that the apron cage (62) has a cleaning opening (70) which is directed towards the inside of the apron (6) and is connected to a suction line (67) . 22. Doppelriemchen-Streckwerk nach Anspruch 21, dadurch gekennzeichnet, daß die Reinigungsöffnung (70) sich quer zur Absaugnut (66) über die Breite des Riemchens (6) erstreckt.22. Double apron drafting system according to claim 21, characterized in that the cleaning opening (70) extends transversely to the suction groove (66) across the width of the apron (6). 23. Doppelriemchen-Streckwerk nach einem oder mehreren der Ansprüche 15 bis 22, dadurch gekennzeichnet, daß im Bereich der Unterzylinder (3', 5') sich ein ortsfest im Maschinengestell angeordneter Absaugkanal (69) erstreckt, an welchen die mit den Oberwalzen (3, 5) bewegbaren Absaugeinrichtungen (62, 67) jeweils kuppelbar angeschlossen sind.23. Double apron drafting system according to one or more of claims 15 to 22, characterized in that in the region of the lower cylinder (3 ', 5') extends a suction duct (69) which is arranged in the machine frame and on which the upper rollers (3 , 5) movable suction devices (62, 67) are each connected so that they can be coupled. 24. Doppelriemchen-Streckwerk nach einem oder mehreren der Ansprüche 8 bis 23, dadurch gekennzeichnet, daß die Riemchenspannung einstellbar ist, so daß es zu einer Ablösung des Riemchens (6) von der Lieferwalze (5) im Ausgangsbereich kommt.24. Double apron drafting system according to one or more of claims 8 to 23, characterized in that the apron tension is adjustable so that there is a detachment of the apron (6) from the delivery roller (5) in the exit area. 25. Doppelriemchen-Streckwerk nach Anspruch 24, dadurch gekennzeichnet, daß der Riemchenkäfig (62) an einem Träger (63) einstellbar gegenüber der Lieferwalze (5) befestigt ist.25. Double apron drafting system according to claim 24, characterized in that the apron cage (62) on a carrier (63) is fixed adjustable relative to the delivery roller (5). 26. Doppelriemchen-Streckwerk nach einem oder mehreren der Ansprüche 8 bis 25, dadurch gekennzeichnet, daß die vom Riemchen (6) umschlungene Lieferwalze (5) im Bereich der Riemchen-Perforation (61) einen Freiraum (51) aufweist.26. Double apron drafting system according to one or more of claims 8 to 25, characterized in that the delivery roller (5) wrapped around the apron (6) has a free space (51) in the area of the apron perforation (61).
EP94110436A 1993-07-14 1994-07-05 Double-apron drafting device Expired - Lifetime EP0635590B2 (en)

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DE19722772A1 (en) * 1997-06-02 1998-12-03 Csm Gmbh Ring spinner drawing unit
DE19815518C2 (en) * 1998-03-30 2003-06-18 Zinser Textilmaschinen Gmbh Method and device for spinning with a suppressed thread balloon
US6332312B1 (en) 1998-03-30 2001-12-25 Zinser Textilmaschinen Gmbh Method and device for spinning with a suppressed yarn balloon
US6263656B1 (en) 1998-03-31 2001-07-24 Spindelfabrik Suessen, Schurr, Stahlecker & Grill Gmbh Arrangement and method for condensing a drafted fiber strand and method for making yarn therefrom
DE19861404B4 (en) * 1998-03-31 2009-12-10 Spindelfabrik Suessen Gmbh Device for compacting a stretched fiber composite
DE19861403B4 (en) * 1998-03-31 2011-08-11 Spindelfabrik Suessen GmbH, 73079 Device for arranging the upper roller of a pair of delivery rollers
US6108873A (en) * 1998-03-31 2000-08-29 Spindelfabrik Suessen, Schurr, Stahlecker & Grill Gmbh Arrangement for condensing a drafted fiber strand and method for making yarn therefrom
DE19861402B4 (en) * 1998-03-31 2013-10-17 Spindelfabrik Suessen Gmbh Device for compacting a stretched fiber composite
DE19846268C2 (en) * 1998-03-31 2002-07-04 Schurr Stahlecker & Grill Device for compacting a stretched fiber composite
US6131383A (en) * 1998-04-03 2000-10-17 Zinser Textilmaschinen Gmbh Spinning machine having a drafting frame provided with a suction roller
DE19815054C1 (en) * 1998-04-03 1999-10-14 Zinser Textilmaschinen Gmbh Process and spinning machine for producing core yarn
US6318060B1 (en) * 1998-04-03 2001-11-20 Zinser Textilmaschinen Gmbh Method and spinning machine for the production of core yarn
US6189308B1 (en) 1998-04-03 2001-02-20 Zinser Textilmaschinen Gmbh Method of and apparatus for producing a yarn on a ring-spinning machine
US6131382A (en) * 1998-04-03 2000-10-17 Zinser Textilmaschinen Gmbh Method of and apparatus for making a mock yarn
EP0947617A2 (en) 1998-04-03 1999-10-06 Zinser Textilmaschinen GmbH Procedure for making a yarn and its spinning machine
DE19815054C5 (en) * 1998-04-03 2007-06-14 Saurer Gmbh & Co. Kg Method and spinning machine for producing coregarn
US6202398B1 (en) 1998-04-03 2001-03-20 Zinser Textilmaschinen Gmbh Method of and apparatus for producing a yarn on a pot-spinning machine
DE19815053B4 (en) * 1998-04-03 2006-01-05 Saurer Gmbh & Co. Kg A method of making a false twist and spinning machine therefor
DE19815049B4 (en) * 1998-04-03 2004-08-19 Saurer Gmbh & Co. Kg Method of manufacturing a yarn and spinning machine therefor
EP0947615A2 (en) 1998-04-03 1999-10-06 Zinser Textilmaschinen GmbH Method and spinning machine for producing a fictitious yarn
DE19815052B4 (en) * 1998-04-03 2005-12-15 Saurer Gmbh & Co. Kg Process for producing a yarn and spinning machine therefor
DE19911333B4 (en) * 1998-07-14 2010-04-01 Spindelfabrik Suessen Gmbh Device for compacting a stretched fiber structure
US6073314A (en) * 1998-07-14 2000-06-13 Spindelfabrik Suessen, Schurr, Stahlecker & Grill Gmbh Device for condensing a drafted fiber strand
DE29925016U1 (en) 1998-07-14 2009-03-05 Spindelfabrik Suessen Gmbh Device for compacting a stretched fiber structure
DE19964595B4 (en) * 1998-07-14 2009-09-17 Spindelfabrik Suessen Gmbh Device for compacting a stretched fiber structure
DE19838762B4 (en) * 1998-08-26 2009-04-16 Maschinenfabrik Rieter Ag Spinning machine with a variety of spinning stations
US6957955B2 (en) 2001-01-11 2005-10-25 Praxair Technology, Inc. Oxygen enhanced low NOx combustion
EP1302572A3 (en) * 2001-10-09 2003-08-06 Zinser Textilmaschinen GmbH Spinning machine for manufacturing core yarns
EP1302572A2 (en) * 2001-10-09 2003-04-16 Zinser Textilmaschinen GmbH Spinning machine for manufacturing core yarns
EP1389640A1 (en) * 2002-08-15 2004-02-18 Maschinenfabrik Rieter Ag Method for running a ring-spinning machine and ring-spinning machine
WO2010114503A1 (en) 2009-03-31 2010-10-07 Ozdilek Alisveris Merkezleri Ve Tekstil Sanayi Anonim Sirketi In yarn production, apron cladding mechanism and method to the rollers coated with elastic material and found in the drafting and guding zone, having shift structure and pre-tensioning mechanism
EP3604646A1 (en) * 2018-08-03 2020-02-05 Saurer Spinning Solutions GmbH & Co. KG Drawing frame unit and drawing frame for a spinning machine
CN111850751A (en) * 2019-04-26 2020-10-30 卓郎智能技术有限公司 Bearing mechanism for apron drafting device
CN111850751B (en) * 2019-04-26 2022-06-21 卓郎智能技术有限公司 Bearing mechanism for apron drafting device

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Publication number Publication date
DE59409019D1 (en) 2000-01-27
JPH07238425A (en) 1995-09-12
EP0635590B2 (en) 2006-01-25
JP3183607B2 (en) 2001-07-09
CN1056892C (en) 2000-09-27
DE4323472A1 (en) 1995-01-19
EP0635590A3 (en) 1995-06-14
DE4323472C2 (en) 1997-08-07
CN1106476A (en) 1995-08-09
EP0635590B1 (en) 1999-12-22
US5600872A (en) 1997-02-11

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