EP2551389B1 - Compaction sensor for a spinning machine - Google Patents

Compaction sensor for a spinning machine Download PDF

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Publication number
EP2551389B1
EP2551389B1 EP12004346.8A EP12004346A EP2551389B1 EP 2551389 B1 EP2551389 B1 EP 2551389B1 EP 12004346 A EP12004346 A EP 12004346A EP 2551389 B1 EP2551389 B1 EP 2551389B1
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EP
European Patent Office
Prior art keywords
suction
flanges
units
compacting
contact surface
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EP12004346.8A
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German (de)
French (fr)
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EP2551389A3 (en
EP2551389A2 (en
Inventor
Gabriel Schneider
Robert Nägeli
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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Publication of EP2551389A3 publication Critical patent/EP2551389A3/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
    • D01H5/70—Constructional features of drafting elements
    • D01H5/72—Fibre-condensing guides

Definitions

  • the invention relates to a suction device for the compression air of two interchangeable suction units on a twin drafting system of a spinning machine according to the preamble of claim 1.
  • the compression elements have a suction slot, which on the one hand communicates with a suction channel and, on the other hand, faces a point of the suction drum provided with perforations.
  • the suction channels of the suction drums are in the assembled state with a suction pipe in connection, via which the suction air is fed to a central suction, which is connected to a vacuum source. From the DE 101 45 444 A1 is z.
  • such a device wherein the suction inserts used there are placed in the suction drums first between the suction drums via a guide in an intermediate position, from which they are successively moved laterally into the interior of the respective suction drum in its working position. Subsequently, a, provided with a channel lid is closed, whereby the suction inserts are locked in their working position.
  • the two suction channels of the suction inserts are in communication with a housing, which is also designed as a channel and through which the suction air is discharged to a central suction.
  • a housing which is also designed as a channel and through which the suction air is discharged to a central suction.
  • three coupling points between the suction channels of the suction inserts, the channel of the cover and housing are necessary.
  • each coupling point between the individual channels involves the risk of leaks and thus the intake of foreign air from the environment of the device, which fiber fly can be sucked in these places and thus leads to contamination and deposits.
  • fiber parts can get into leaks at the suction channel.
  • such leaks lead to a vacuum drop in the region of the suction slots and ultimately to a reduction of the suction work on the suction drum.
  • the attachment of sealing elements in the solution shown necessary which in turn makes the device more expensive and expensive.
  • the sealing elements must be checked at regular intervals for their function. It has also been shown that the air ducting over the duct of the lid is not optimal and that air turbulences can occur inside the duct.
  • the invention now has the task of avoiding the existing disadvantages of known solutions and to propose an easy-to-use suction device, in which no additional sealing elements in the region of the coupling points are required and an optimal air flow is ensured within the suction device.
  • FIG. 1 shows a schematic side view of a spinning station 1 a spinning machine (ring spinning machine) with one, of two adjacent drafting units 2 of a cylinder drafting 2z.
  • the drafting units 2 are each provided with an input roller pair 3, a middle roller pair 4 and a pair of output rollers 5.
  • To each of the center rollers of the middle roller pair a strap is guided, which are each held around a cage not shown in detail in its illustrated position.
  • the upper rollers of said pairs of rollers 3 to 5 are designed as pressure rollers which are rotatably mounted on the axes of a pivotally mounted pressure arm (not shown).
  • the lower rollers of the roller pairs 3, 4, 5 are connected to a drive, not shown.
  • roller pairs 4 are slightly higher than the peripheral speed of the roller pairs 3, so that the, the drafting unit 2 supplied fiber in the form of a sliver L between the pair of input rollers 3 and the middle roller pair 4 is subjected to a pre-delay.
  • the main distortion of the fiber material L is formed between the middle roller pair 4 and the output roller pair 5, wherein the output roller pair 5 has a substantially higher peripheral speed than the middle roller pair 4.
  • the output roller pair 5 is equipped with a compression device W in the present example.
  • the compression device W consists of a suction drum 6, which is driven via an axis 8.
  • the suction drum 6 is associated with a pressure roller 9, which forms with her a nip P1.
  • a pinch roller 7 also called rotation locking roller
  • the compression device W consists of a suction drum 6, which is driven via an axis 8.
  • the suction drum 6 is associated with a pressure roller 9, which forms with her a nip P1.
  • a pinch roller 7 also called rotation locking roller
  • a suction zone Z in which the fiber material V discharged from the clamping point P1 is compressed by the action of a suction air.
  • This compaction process is well known and has already been described in previous publications. It is therefore not discussed here in detail.
  • a cover 13 is attached, which serves to guide the air during the compression process.
  • the compressed yarn G delivered downwards via the clamping point P is fed via a yarn guide 43 to a ring spinning device shown schematically.
  • a ring 39 and a rotor 40 wherein the yarn G is wound onto a sleeve 41 to form a coil 42 (Kops).
  • the ring 39 is attached to a ring frame 44, which performs an up and down movement during the spinning process.
  • suction units 10, 10a are arranged within the suction drums, which in particular from the enlarged view X (after FIG. 1 ) in FIG. 2 can be seen.
  • the suction unit 10 of the suction drum 6 has a suction slot (suction opening) 11, which faces the region on the inside of the suction drum 6 in which the openings OE are arranged on the circumference of the suction drum 6.
  • the suction slot 11 is connected to a suction channel 12 mounted inside the suction unit 10, which opens into an outlet opening 01 of a flange F1, which is attached to the suction unit 10.
  • a further suction drum 6a is mounted on the shaft 8, in which a suction unit 10a mounted in mirror image with respect to the suction unit 10 is provided.
  • the suction unit 10a in this case has a suction slot 11a, which opens into a suction channel 12a.
  • the outlet opening 02 of the suction channel 12a is located in a flange F2, which is connected to the suction unit 10a.
  • FIG. 2 As in particular from the enlarged view (after FIG. 2 ) of the FIG. 3 can be seen, are the flanges F1, F2 in the installed state of the suction units 10, 10a with their stop surfaces A1, A2 on a stop surface A of the suction tube 22.
  • the flanges F1, F2 are directly adjacent to each other on this stop surface A on, with the oppositely directed outer surfaces FG directly adjacent to each other.
  • the outer surfaces FG are each inclined by an angle c to the respective abutment surfaces A1 and A2 and form a wedge-shaped free space with an angle b.
  • In the mounted position projects into this space K a central web 26 which is fixed to a flap (holding means) 17 which is pivotally mounted about the axes 18 on a suction member 15.
  • the web 26 in this case has an edge 27 which engages with an angle b in the wedge-shaped free space K.
  • the suction tube 22 is attached to the suction element 15.
  • a guide 16 is also attached, which has spaced-apart slide rails 14. About these slides 14, the suction units 10, 10a attached to the suction units guide webs 21 on the guide 16 in the in FIG. 3 transferred operating position transferred. Similar examples of such guide webs are for. B. also from the DE 10 2005 044 967 A1 refer to.
  • the pivotable flap 17, which serves as a holding means for the suction units 10, 10a, has at its free end a latch 28 which engages in the closed position in a recess 29 of the guide 16 and the flap 17 in this position under a certain bias in holding this locked position.
  • a pressure is exerted on the outer surfaces FG of the flanges F1, F2 via the edge 27, whereby a resultant compressive force arises on the oblique outer surfaces FG which attempts to push both flanges F1, F2 away from one another.
  • this is prevented by webs 32, 33, which are mounted in the region of the narrow sides of the rectangular opening O in the region laterally of the stop surface A. Ie.
  • the upper outer surfaces F and a part of the lateral outer surfaces F of the flanges F1, F2 are covered by the correspondingly shaped flap 17.
  • webs 23 and 24 are provided which cover the lateral outer surfaces F of the flanges F1, F2 up to the webs 32, 33.
  • the axes 18, about which the flap 17 is pivotally mounted, are attached to the suction element 15.
  • the central web 26 which is fixed to the flap 17 extends over the entire length of the outer surfaces FG.
  • the suction tube 22 has a tapered end 46, which opens into a circular pipe end 47.
  • a flange 48 is provided, via which the tube 22 is received and stored in a groove 50 of a bearing element 30.
  • the usually made of rubber bearing member 30 is attached via a circumferential groove 49 on a machine frame MR.
  • an insertion aid EF is provided on the bearing element, which extends umbrella-like about half the circumference of the tube 22.
  • a further tube 47 is fixed in the bearing element 30, which is connected via a coupling 35 with a central suction channel 37 in connection.
  • the suction channel 37 is connected to a vacuum source UP.

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

Description

Die Erfindung bezieht sich auf eine Absaugvorrichtung für die Verdichtungsluft von zwei auswechselbaren Saugeinheiten an einem Zwillingsstreckwerk einer Spinnmaschine nach dem Oberbegriff des Patentanspruches 1.The invention relates to a suction device for the compression air of two interchangeable suction units on a twin drafting system of a spinning machine according to the preamble of claim 1.

Aus der Praxis sind verschiedene Ausführungen bekannt, wobei auswechselbare Saugeinheiten an Verdichtungselementen, wie z. B. an perforierten Saugtrommeln eingesetzt werden. Die Verdichtungselemente weisen in der Regel einen Saugschlitz auf, der einerseits mit einem Saugkanal in Verbindung steht und andererseits einer, mit Perforationen versehenen Stelle der Saugtrommel gegenüberstehen. Die Saugkanäle der Saugtrommeln stehen im montierten Zustand mit einem Absaugrohr in Verbindung, über welches die Saugluft zu einer zentralen Absaugung geführt wird, die mit einer Unterdruckquelle verbunden ist.
Aus der DE 101 45 444 A1 ist z. B. eine solche Vorrichtung bekannt, wobei die dort verwendeten Saugeinsätze zum einsetzen in die Saugtrommeln zuerst zwischen den Saugtrommeln über eine Führung in eine Zwischenposition gebracht werden, von welcher sie nacheinander seitlich in den Innenraum der jeweiligen Saugtrommel in ihre Arbeitsposition verschoben werden. Anschliessend wird ein, mit einem Kanal versehener Deckel geschlossen, womit die Saugeinsätze in ihrer Arbeitsposition verriegelt werden. Über den Kanal des Deckels stehen die beiden Saugkanäle der Saugeinsätze mit einem Gehäuse in Verbindung, welches ebenfalls als Kanal ausgebildet ist und über welchen die Saugluft zu einer zentralen Absaugung abgeführt wird. Bei der gezeigten Vorrichtung sind drei Kupplungsstellen zwischen den Saugkanälen der Saugeinsätze, dem Kanal des Deckels und Gehäuse notwendig. Jede Kupplungsstelle zwischen den einzelnen Kanälen beinhaltet jedoch die Gefahr von Undichtheiten und somit das Ansaugen von Fremdluft aus der Umgebung der Vorrichtung, wodurch auch Faserflug an diesen Stellen angesaugt werden kann und somit zu Verschmutzungen und Ablagerungen führt. Auch können Faserteile an undichten Stellen in den Absaugkanal gelangen. Ausserdem führen derartige Undichtheiten zu einem Unterdruckabfall im Bereich der Saugschlitze und letztendlich zu einer Reduzierung der Saugarbeit an der Saugtrommel. Um dies zu vermeiden ist bei der gezeigten Lösung die Anbringung von Dichtungselementen notwendig, was wiederum die Vorrichtung aufwendiger macht und verteuert. Ausserdem müssen die Dichtungselemente in regelmässigen zeitlichen Abständen auf ihre Funktion überprüft werden. Es hat sich auch gezeigt, dass die Luftführung über den Kanal des Deckels nicht optimal ist und es zu Luftverwirbelungen innerhalb des Kanals kommen kann.
Um die oben beschriebene Ausführung zu verbessern wurde in der DE 10 2005 044 967 A1 eine Absaugvorrichtung vorgeschlagen, wobei die Saugkanäle der Saugeinheiten direkt (ohne einen Zwischenkanal) mit einem Absaugrohr gekoppelt werden. Dabei weist das Absaugrohr an seinem Ende zwei getrennte runde Saugkanäle auf, welche zu einem gemeinsamen Absaugrohr zusammengeführt werden. Über eine an dem Absaugrohr angebrachte Trägerplatte und an dieser angebrachten Führungen werden Saugelemente in ihre Betriebsposition überführt, bzw. aus dieser entfernt. Mit dieser vorgeschlagenen Ausführung konnte eine der Kupplungsstellen in Bezug auf die zuvor beschriebene Ausführung eingespart werden. Ausserdem konnte mit dieser Ausführung die Luftführung innerhalb der Absaugvorrichtung verbessert werden. Allerdings sind nach wie vor auch bei dieser Lösung Vorkehrungen zu treffen, um bei den noch vorhandenen Kupplungsstellen diese Stellen ausreichend gegen die Umgebungsluft abzuschotten, bzw. abzudichten. So ist es auch bei dieser Lösung erforderlich, entsprechende Dichtungselemente im Bereich der Kupplungsstellen anzubringen, wodurch ebenfalls diese Übergangsstellen aufwändiger werden und einer regelmässigen Wartung zu unterziehen sind.From practice various designs are known, with interchangeable suction units of compression elements, such. B. be used on perforated suction drums. As a rule, the compression elements have a suction slot, which on the one hand communicates with a suction channel and, on the other hand, faces a point of the suction drum provided with perforations. The suction channels of the suction drums are in the assembled state with a suction pipe in connection, via which the suction air is fed to a central suction, which is connected to a vacuum source.
From the DE 101 45 444 A1 is z. For example, such a device is known, wherein the suction inserts used there are placed in the suction drums first between the suction drums via a guide in an intermediate position, from which they are successively moved laterally into the interior of the respective suction drum in its working position. Subsequently, a, provided with a channel lid is closed, whereby the suction inserts are locked in their working position. About the channel of the lid, the two suction channels of the suction inserts are in communication with a housing, which is also designed as a channel and through which the suction air is discharged to a central suction. In the device shown, three coupling points between the suction channels of the suction inserts, the channel of the cover and housing are necessary. However, each coupling point between the individual channels involves the risk of leaks and thus the intake of foreign air from the environment of the device, which fiber fly can be sucked in these places and thus leads to contamination and deposits. Also, fiber parts can get into leaks at the suction channel. In addition, such leaks lead to a vacuum drop in the region of the suction slots and ultimately to a reduction of the suction work on the suction drum. To avoid this is the attachment of sealing elements in the solution shown necessary, which in turn makes the device more expensive and expensive. In addition, the sealing elements must be checked at regular intervals for their function. It has also been shown that the air ducting over the duct of the lid is not optimal and that air turbulences can occur inside the duct.
In order to improve the embodiment described above was in the DE 10 2005 044 967 A1 proposed a suction device, wherein the suction channels of the suction units are coupled directly (without an intermediate channel) with a suction tube. In this case, the suction tube at its end two separate round suction channels, which are brought together to form a common suction tube. By means of a support plate attached to the suction tube and guides attached thereto, suction elements are transferred to their operating position, or removed therefrom. With this proposed embodiment, one of the coupling points could be saved with respect to the embodiment described above. In addition, with this design, the air flow could be improved within the suction device. However, provision must still be made in this solution, in order to seal off or seal these points sufficiently against the ambient air in the coupling points that are still present. So it is also necessary in this solution to install appropriate sealing elements in the coupling points, which also these transition points are more complex and must be subjected to regular maintenance.

Die Erfindung stellt sich nunmehr die Aufgabe die vorhandenen Nachteile bekannter Lösungen zu vermeiden und eine einfach zu bedienende Absaugvorrichtung vorzuschlagen, bei welcher keine zusätzlichen Dichtelemente im Bereich der Kupplungsstellen benötigt werden und eine optimale Luftführung innerhalb der Absaugvorrichtung gewährleistet wird.The invention now has the task of avoiding the existing disadvantages of known solutions and to propose an easy-to-use suction device, in which no additional sealing elements in the region of the coupling points are required and an optimal air flow is ensured within the suction device.

Diese Aufgabe wird dadurch gelöst, indem vorgeschlagen wird, dass die Ausgangsöffnungen der Saugeinheiten jeweils einen rechteckförmig umlaufenden Flansch mit einer ebenen Anschlagfläche aufweisen, welche an einer gemeinsamen Kupplungsstelle nebeneinander auf einer umlaufenden, ebenen Anschlagfläche einer gemeinsamen, rechteckförmig ausgebildeten Öffnung des Absaugrohres aufliegen, wobei die Flansche mit den Ausgangsöffnungen der Saugeinheiten die Öffnung des Absaugrohres vollständig überdecken und über das Haltemittel mit einer Druckkraft auf der Anschlagfläche gehalten werden. Der Begriff "umlaufende, ebene Anschlagfläche" bedeutet, dass die rechteckförmige Öffnung von einer in sich geschlossenen Fläche umgeben ist. Über die ebenen (ebenfalls in sich geschlossenen) Flächen der Flansche, welche unter der Einwirkung einer Druckkraft auf der ebenen Anschlagfläche der Öffnung des Absaugrohres aufliegen, erhält man eine ausreichende Abdichtungsfläche im Bereich der Kupplungsstelle, welche die Absaugvorrichtung gegenüber der Umgebung abschottet. Ausserdem sind die Saugeinheiten leicht und schnell zu montieren und zu demontieren.
Des Weiteren wird vorgeschlagen, dass das Saugelement in Bereich der Anschlagfläche und das Haltemittel derart ausgeformt sind, dass in der Verriegelungsstellung des Haltemittels die offen liegenden Aussenflächen der Flansche der Saugeinheiten überdeckt werden. Damit erhält man eine zusätzliche Abdichtfläche, welche sich geschlossen um den Umfang der nach aussen gerichteten Aussenflächen der Flansche erstreckt. D. h., sofern trotz der grossen Dichtfläche Undichtheiten in diesem Bereich auftreten würden, müssten Fasern, des sich in dem, in der Umgebung der Absaugvorrichtung befindlichen Faserfluges befinden, eine 90° Umlenkung im Bereich der Flansche durchführen, um in die Absaugvorrichtung zu gelangen. Damit erhält man eine zusätzliche Barriere, die das Eindringen von Verschmutzungen in den Bereich der Absaugvorrichtung an dieser Kupplungsstelle erschweren.
Um eine zusätzliche Abschottung an den Aussenflächen der Flansche zu erzielen, wird vorgeschlagen, dass das Saugelement, im Abstand zu den schmalen Seiten der rechteckigen Öffnung des Absaugrohres, seitlich angebrachte Stege aufweist, auf welchen zumindest teilweise, die in Richtung der Stege zeigenden Aussenflächen der nebeneinander liegenden Flansche der Saugeinheiten in Verriegelungsstellung anliegen.
Um eine Druckkraft auf die Flansche in ihrer montierten Position zu erzeugen, damit ihre Anschlagflächen sicher auf der Anschlagfläche der Öffnung des Absaugrohres aufliegen, wird weiter vorgeschlagen, dass die in der Verriegelungsstellung befindlichen und gegeneinander gerichteten Aussenflächen der Flansche der Saugeinheiten in Bezug auf ihre jeweilige Anschlagfläche unter einem Winkel kleiner als 90° verlaufen und das Halteelement einen Mittelsteg aufweist, der mit einer, im spitzen Winkel d auslaufenden freien Kante versehen ist, welche in Verriegelungsstellung zwischen die, gegeneinander gerichtete Aussenflächen der Flansche eingreift. Durch die keilförmige Ausbildung der gegeneinander gerichteten Aussenflächen der Flansche in montiertem Zustand im Zusammenwirken mit der keilförmig ausgebildeten Kante des Halteelementes wird einerseits eine Klemmkraft zwischen den beschriebenen Anschlagflächen erzeugt und andererseits wird durch die Keilwirkung über das Halteelement eine Kraft erzeugt, welche versucht, die beiden gegenüberliegenden Flächen der Flansche voneinander wegzudrücken. Dadurch werden die nach aussen gerichteten Aussenflächen der Flansche, welche ihren gegeneinander gerichteten Aussenflächen gegenüberstehen, gegen die seitlich an der Öffnung angebrachten Stege gedrückt. Damit werden die Flansche und somit die jeweils mit ihnen verbundene Saugeinheit fest in ihrer Position gegenüber den Saugtrommeln verriegelt und fixiert.
Weitere Vorteile der Erfindung werden in nachfolgenden Ausführungsbeispielen näher aufgezeigt und beschrieben.
Es zeigen:

Fig. 1
eine schematische Seitenansicht einer Spinnstelle einer Ringspinnmaschine mit einer Streckwerkseinheit eines Zwillingsstreckwerkes und einer erfindungsgemäss angebrachten Kupplungsstelle.
Fig. 2
eine vergrösserte Teilansicht X nach Fig.1 mit zwei nebeneinander liegenden Verdichtungsvorrichtungen.
Fig. 2a
eine Schnittdarstellung N-N nach Fig.2.
Fig. 2b
eine Teilansicht nach Fig.2a der Schwenkstelle für die Klappe
Fig. 3
eine vergrösserte Teilansicht nach Fig.2
Fig. 4
eine Ansicht W nach Fig.3
This object is achieved by proposing that the outlet openings of the suction units each have a rectangular circumferential flange with a flat stop surface, which at a common coupling point next to each other on a circumferential, flat stop surface of a common, Rectangular formed opening of the suction tube, the flanges with the outlet openings of the suction completely cover the opening of the suction tube and are held on the holding means with a compressive force on the stop surface. The term "circumferential, flat stop surface" means that the rectangular opening is surrounded by a self-contained surface. On the flat (also self-contained) surfaces of the flanges, which rest under the action of a compressive force on the flat abutment surface of the opening of the suction, to obtain a sufficient sealing surface in the coupling point, which seals the suction against the environment. In addition, the suction units are easy and quick to assemble and disassemble.
Furthermore, it is proposed that the suction element in the region of the stop surface and the holding means are formed such that in the locking position of the holding means, the exposed outer surfaces of the flanges of the suction units are covered. This results in an additional sealing surface, which extends closed around the circumference of the outwardly directed outer surfaces of the flanges. In other words, if leaks occur in this area despite the large sealing surface, fibers which are located in the fiber fly located in the vicinity of the suction device would have to make a 90 ° deflection in the area of the flanges in order to reach the suction device , This results in an additional barrier that complicates the ingress of contaminants in the area of the suction device at this coupling point.
In order to achieve an additional foreclosure on the outer surfaces of the flanges, it is proposed that the suction element, at a distance from the narrow sides of the rectangular opening of the suction tube, laterally mounted webs, on which at least partially, the outer surfaces facing in the direction of the webs side by side lying flanges of the suction units in locking position.
In order to generate a compressive force on the flanges in their mounted position, so that their stop surfaces rest securely on the stop surface of the opening of the suction tube, it is further proposed that the located in the locking position and facing each other outer surfaces of the flanges of the suction units with respect to their respective stop surface extend at an angle less than 90 ° and the holding element has a central web, which terminates with a, at an acute angle d is provided free edge, which engages in the locking position between the oppositely directed outer surfaces of the flanges. Due to the wedge-shaped design of the oppositely directed outer surfaces of the flanges in the assembled state in cooperation with the wedge-shaped edge of the holding element, a clamping force between the abutment surfaces described is generated on the one hand and on the other hand, a force is generated by the wedge effect on the holding element, which tries to opposite the two Push surfaces of the flanges away from each other. Thereby, the outwardly directed outer surfaces of the flanges, which face their oppositely directed outer surfaces, pressed against the laterally attached to the opening webs. Thus, the flanges and thus the respectively associated with them suction unit are firmly locked in their position relative to the suction drums and fixed.
Further advantages of the invention will be shown and described in more detail in subsequent embodiments.
Show it:
Fig. 1
a schematic side view of a spinning station of a ring spinning machine with a drafting unit of a twin drafting and a coupling point according to the invention mounted.
Fig. 2
an enlarged partial view X after Fig.1 with two juxtaposed compaction devices.
Fig. 2a
a sectional view NN after Fig.2 ,
Fig. 2b
a partial view after 2a the pivot point for the flap
Fig. 3
an enlarged partial view Fig.2
Fig. 4
a view W to Figure 3

Figur 1 zeigt eine schematische Seitenansicht einer Spinnstelle 1 einer Spinnmaschine (Ringspinnmaschine) mit einer, von zwei nebeneinander liegenden Streckwerkseinheiten 2 eines Zylinderstreckwerkes 2z. Die Streckwerkseinheiten 2 sind jeweils mit einem Eingangswalzenpaar 3, einem Mittelwalzenpaar 4 und einem Ausgangswalzenpaar 5 versehen. Um die Mittelwalzen des Mittelwalzenpaares ist jeweils ein Riemchen geführt, die jeweils um einen nicht näher gezeigten Käfig in ihrer dargestellten Lage gehalten werden. Die oberen Walzen der genannten Walzenpaare 3 bis 5 sind als Druckwalzen ausgeführt, welche über die Achsen an einem schwenkbar gelagerten Druckarm (nicht gezeigt) drehbeweglich gelagert sind.
Die unteren Walzen der Walzenpaare 3, 4, 5 sind, mit einem nicht gezeigten Antrieb verbunden. Dabei können Einzelantriebe, wie auch andere Antriebsformen (Zahnräder, Zahnriemen, usw.) eingesetzt werden. Über die angetriebenen Unterwalzen werden die Druckwalzen, bzw. deren Riemchen über Friktion angetrieben. Die Umfangsgeschwindigkeit der Walzenpaare 4 ist etwas höher als die Umfangsgeschwindigkeit der Walzenpaare 3, sodass das, der Streckwerkeinheit 2 zugeführte Fasergut in Form einer Lunte L zwischen dem Eingangswalzenpaar 3 und dem Mittenwalzenpaar 4 einem Vorverzug unterworfen wird. Der Hauptverzug des Fasergutes L entsteht zwischen dem Mittenwalzenpaar 4 und dem Ausgangswalzenpaar 5, wobei das Ausgangswalzenpaar 5 eine wesentlich höhere Umfangsgeschwindigkeit als das Mittelwalzenpaar 4 aufweist. Das Ausgangswalzenpaar 5 ist im vorliegenden Beispiel mit einer Verdichtungsvorrichtung W ausgestattet. FIG. 1 shows a schematic side view of a spinning station 1 a spinning machine (ring spinning machine) with one, of two adjacent drafting units 2 of a cylinder drafting 2z. The drafting units 2 are each provided with an input roller pair 3, a middle roller pair 4 and a pair of output rollers 5. To each of the center rollers of the middle roller pair a strap is guided, which are each held around a cage not shown in detail in its illustrated position. The upper rollers of said pairs of rollers 3 to 5 are designed as pressure rollers which are rotatably mounted on the axes of a pivotally mounted pressure arm (not shown).
The lower rollers of the roller pairs 3, 4, 5 are connected to a drive, not shown. In this case, individual drives, as well as other forms of drive (gears, timing belts, etc.) can be used. About the driven lower rollers, the pressure rollers, and their straps are driven by friction. The peripheral speed of the roller pairs 4 is slightly higher than the peripheral speed of the roller pairs 3, so that the, the drafting unit 2 supplied fiber in the form of a sliver L between the pair of input rollers 3 and the middle roller pair 4 is subjected to a pre-delay. The main distortion of the fiber material L is formed between the middle roller pair 4 and the output roller pair 5, wherein the output roller pair 5 has a substantially higher peripheral speed than the middle roller pair 4. The output roller pair 5 is equipped with a compression device W in the present example.

Die Verdichtungsvorrichtung W besteht dabei aus einer Saugtrommel 6, welche über eine Achse 8 angetrieben wird. Der Saugtrommel 6 ist eine Druckwalze 9 zugeordnet, welche mit ihr eine Klemmstelle P1 bildet. Wie schematisch aus der vergrösserten Darstellung der Figur 2 zu entnehmen, ist die Saugtrommel 6 und die, zu ihr achsparallel zugeordnete Saugtrommel 6a mit auf ihrem Umfang angeordneten Öffnungen OE versehen. Im Anschluss an die Druckwalze 9 ist eine Klemmwalze 7 (auch Drehungssperrwalze genannt) angebracht, welche auf dem Umfang der Saugwalze 6 (bzw. 6a) aufliegt und zusammen mit dieser eine Klemmstelle P bildet. Zwischen den Klemmstellen P1 und P befindet sich eine Saugzone Z, in welcher das von der Klemmstelle P1 abgegebene Fasergut V durch die Einwirkung einer Saugluft verdichtet wird. Dieser Verdichtungsvorgang ist allgemein bekannt und auch schon in früheren Veröffentlichungen beschrieben worden. Es wird deshalb hier nicht näher darauf eingegangen. Oberhalb der Saugzone ist eine Abdeckung 13 angebracht, die zur Luftführung beim Verdichtungsprozess dient.
Das über die Klemmstelle P nach unten abgegebene verdichtete Garn G wird über einen Fadenführer 43 einer schematisch gezeigten Ringspinneinrichtung zugeführt. Diese ist mit einem Ring 39 und einem Läufer 40 versehen, wobei das Garn G auf eine Hülse 41 zur Bildung einer Spule 42 (Kops) aufgewickelt wird. Der Ring 39 ist an einem Ringrahmen 44 befestigt, welcher während dem Spinnprozess eine Auf- und Abbewegung durchführt.The compression device W consists of a suction drum 6, which is driven via an axis 8. The suction drum 6 is associated with a pressure roller 9, which forms with her a nip P1. As schematically from the enlarged view of FIG. 2 can be seen, the suction drum 6 and, associated with it axially parallel suction drum 6a provided with arranged on its circumference openings OE. Subsequent to the pressure roller 9 is a pinch roller 7 (also called rotation locking roller) is mounted, which rests on the circumference of the suction roller 6 (or 6a) and forms together with this a terminal point P. Between the clamping points P1 and P there is a suction zone Z, in which the fiber material V discharged from the clamping point P1 is compressed by the action of a suction air. This compaction process is well known and has already been described in previous publications. It is therefore not discussed here in detail. Above the suction zone, a cover 13 is attached, which serves to guide the air during the compression process.
The compressed yarn G delivered downwards via the clamping point P is fed via a yarn guide 43 to a ring spinning device shown schematically. This is provided with a ring 39 and a rotor 40, wherein the yarn G is wound onto a sleeve 41 to form a coil 42 (Kops). The ring 39 is attached to a ring frame 44, which performs an up and down movement during the spinning process.

Zur Erzeugung einer Saugluft im Bereich der Verdichtungszone Z der jeweiligen Saugtrommel 6, 6a sind innerhalb der Saugtrommeln Saugeinheiten 10, 10a angeordnet, was insbesondere aus der vergrösserten Ansicht X (nach Figur 1) in Figur 2 zu entnehmen ist. Aus Übersichtlichkeitsgründen wurde in Fig.2 auf die Darstellung des Eingangswalzenpaares 3 und des Mittelwalzenpaares 4, sowie der Druckwalze 9 und der Klemmwalze 7 verzichtet. Die Saugeinheit 10 der Saugtrommel 6 weist einen Saugschlitz (Saugöffnung) 11auf, welcher auf der Innenseite der Saugtrommel 6 dem Bereich gegenüber steht, in welchem die Öffnungen OE auf dem Umfang der Saugtrommel 6 angeordnet sind.To generate a suction air in the region of the compression zone Z of the respective suction drum 6, 6a suction units 10, 10a are arranged within the suction drums, which in particular from the enlarged view X (after FIG. 1 ) in FIG. 2 can be seen. For clarity was in Fig.2 to the representation of the pair of input rollers 3 and the middle roller pair 4, and the pressure roller 9 and the pinch roller 7 omitted. The suction unit 10 of the suction drum 6 has a suction slot (suction opening) 11, which faces the region on the inside of the suction drum 6 in which the openings OE are arranged on the circumference of the suction drum 6.

Der Saugschlitz 11 ist mit einem innerhalb der Saugeinheit 10 angebrachten Saugkanal 12 verbunden, der in einer Ausgangsöffnung 01 eines Flansches F1 mündet, welcher an der Saugeinheit 10 angebracht ist. Koaxial zur Saugtrommel 6 ist auf der Welle 8 eine weitere Saugtrommel 6a angebracht, in welcher eine spiegelbildlich zur Saugeinheit 10 angebrachte Saugeinheit 10a vorgesehen ist. Die Saugeinheit 10a weist dabei einen Saugschlitz 11a auf, welcher in einen Saugkanal 12a mündet. Die Ausgangsöffnung 02 des Saugkanals 12a befindet sich in einem Flansch F2, welcher mit der Saugeinheit 10a verbunden ist.The suction slot 11 is connected to a suction channel 12 mounted inside the suction unit 10, which opens into an outlet opening 01 of a flange F1, which is attached to the suction unit 10. Coaxial with the suction drum 6, a further suction drum 6a is mounted on the shaft 8, in which a suction unit 10a mounted in mirror image with respect to the suction unit 10 is provided. The suction unit 10a in this case has a suction slot 11a, which opens into a suction channel 12a. The outlet opening 02 of the suction channel 12a is located in a flange F2, which is connected to the suction unit 10a.

Wie insbesondere aus der vergrösserten Darstellung (nach Figur 2) der Figur 3 zu entnehmen, liegen die Flansche F1, F2 im eingebauten Zustand der Saugeinheiten 10, 10a mit ihren Anschlagflächen A1, A2 auf einer Anschlagfläche A des Absaugrohres 22 auf. Die Flansche F1, F2 liegen direkt nebeneinander angrenzend auf dieser Anschlagfläche A auf, wobei die gegeneinander gerichteten Aussenflächen FG direkt aneinander angrenzen. Die Aussenflächen FG sind jeweils um einen Winkel c zu den jeweiligen Anschlagflächen A1 bzw. A2 geneigt und bilden einen keilförmigen Freiraum mit einem Winkel b. In montierter Stellung ragt in diesen Freiraum K ein Mittelsteg 26, der an einer Klappe (Haltemittel) 17 befestigt ist, welche um die Achsen 18 schwenkbar an einem Saugelement 15 angebracht ist. Der Steg 26 weist dabei eine Kante 27 auf, welche mit einem Winkel b in den keilförmigen Freiraum K eingreift. Das Absaugrohr 22 ist am Saugelement 15 befestigt.As in particular from the enlarged view (after FIG. 2 ) of the FIG. 3 can be seen, are the flanges F1, F2 in the installed state of the suction units 10, 10a with their stop surfaces A1, A2 on a stop surface A of the suction tube 22. The flanges F1, F2 are directly adjacent to each other on this stop surface A on, with the oppositely directed outer surfaces FG directly adjacent to each other. The outer surfaces FG are each inclined by an angle c to the respective abutment surfaces A1 and A2 and form a wedge-shaped free space with an angle b. In the mounted position projects into this space K a central web 26 which is fixed to a flap (holding means) 17 which is pivotally mounted about the axes 18 on a suction member 15. The web 26 in this case has an edge 27 which engages with an angle b in the wedge-shaped free space K. The suction tube 22 is attached to the suction element 15.

An dem Saugelement 15 ist ausserdem eine Führung 16 befestigt, welche im Abstand zueinander angebrachte Gleitschienen 14 aufweist. Über diese Gleitschienen 14 werden die Saugeinheiten 10, 10a über an den Saugeinheiten angebrachten Führungsstege 21 auf der Führung 16 in die in Figur 3 gezeigte Betriebsstellung überführt. Ähnliche Beispiele solcher Führungsstege sind z. B. auch aus der DE 10 2005 044 967 A1 zu entnehmen.On the suction member 15, a guide 16 is also attached, which has spaced-apart slide rails 14. About these slides 14, the suction units 10, 10a attached to the suction units guide webs 21 on the guide 16 in the in FIG. 3 transferred operating position transferred. Similar examples of such guide webs are for. B. also from the DE 10 2005 044 967 A1 refer to.

Die schwenkbare Klappe 17, welche als Haltemittel für die Saugeinheiten 10, 10a dient, weist an ihrem freien Ende ein Riegel 28 auf, welcher in geschlossener Position in einer Ausnehmung 29 der Führung 16 eingreift und die Klappe 17 in dieser Stellung unter einer bestimmten Vorspannung in dieser verriegelten Position hält. Dabei wird gleichzeitig über die Kante 27 ein Druck auf die Aussenflächen FG der Flansche F1, F2 ausgeübt, wodurch auf die schrägen Aussenflächen FG eine resultierende Druckkraft entsteht, welche versucht beide Flansche F1, F2 voneinander weg zu drücken. Dies wird jedoch von Stegen 32, 33 unterbunden, welche im Bereich der schmalen Seiten der rechteckigen Öffnung O im Bereichseitlich der Anschlagfläche A angebracht sind. D. h. die Aussenflächen F der Flansche F1, F2 werden über diese resultierende Kraft gegen die Stege 32 und 33 gedrückt, womit die Flansche F1 und F2, bzw. die mit ihnen verbundene Saugeinheit 10, 10a in ihrer Lage in axialer Richtung zur Achse 8 der Saugtrommel 6, 6a fixiert werden. Dies ist insbesondere aus der Darstellung der Figur 2a (Schnitt N-N) zu entnehmen. Unterhalb der Stege 32 und 33 ist ein Steg 31 angeordnet, der mit den Stegen 32 und 33 verbunden ist. Durch diesen Steg 31 werden die unteren Aussenflächen F der Flansche F1, F2 abgedeckt.The pivotable flap 17, which serves as a holding means for the suction units 10, 10a, has at its free end a latch 28 which engages in the closed position in a recess 29 of the guide 16 and the flap 17 in this position under a certain bias in holding this locked position. At the same time, a pressure is exerted on the outer surfaces FG of the flanges F1, F2 via the edge 27, whereby a resultant compressive force arises on the oblique outer surfaces FG which attempts to push both flanges F1, F2 away from one another. However, this is prevented by webs 32, 33, which are mounted in the region of the narrow sides of the rectangular opening O in the region laterally of the stop surface A. Ie. the outer surfaces F of the flanges F1, F2 are pressed against the webs 32 and 33 via this resultant force, with which the flanges F1 and F2, or the suction unit 10, 10a connected to them, in their position in the axial direction to the axis 8 of the suction drum 6 6a are fixed. This is in particular from the representation of the FIG. 2a (Section NN) to take. Below the webs 32 and 33, a web 31 is arranged, which is connected to the webs 32 and 33. By this web 31, the lower outer surfaces F of the flanges F1, F2 are covered.

Wie insbesondere aus der Teilansicht Y (nach Figur 2a) der Figur 2b zu entnehmen, werden die oberen Aussenflächen F und ein Teil der seitlichen Aussenflächen F der Flansche F1, F2 durch die entsprechend ausgeformte Klappe 17 überdeckt. Dabei sind im Anschluss an die Achse 18 an der Klappe 17 Stege 23 und 24 vorgesehen, welche die seitlichen Aussenflächen F der Flansche F1, F2 bis zu den Stegen 32, 33 abdecken. Die Achsen 18, um welche die Klappe 17 schwenkbar angeordnet ist, sind am Saugelement 15 befestigt. In der Ansicht nach Figur 2b ist ausserdem ersichtlich, dass sich der Mittelsteg 26, welcher an der Klappe 17 befestigt ist, über die gesamte Länge der Aussenflächen FG erstreckt. Damit wird auch die Abdichtung im Bereich zwischen den inneren Aussenflächen FG gewährleistet, selbst wenn diese durch das Auseinanderdrücken einen geringen Abstand voneinander aufweisen würden. Das Absaugrohr 22 weist ein verjüngtes Ende 46 auf, welches in ein kreisrundes Rohrende 47 mündet. Am Rohrende 47 ist ein Flansch 48 vorgesehen, über welchen das Rohr 22 in einer Rille 50 eines Lagerelementes 30 aufgenommen und gelagert ist. Das in der Regel aus Gummi bestehende Lagerelement 30 wird über eine umlaufende Nut 49 an einem Maschinenrahmen MR befestigt. Zur Unterstützung der Montage des Rohres 22 in das Lagerelement 30 ist am Lagerelement eine Einführhilfe EF vorgesehen, welche sich schirmartig etwa um den halben Umfang des Rohres 22 erstreckt. Im Anschluss an das Rohrende 47 des Absaugrohres 22 ist in dem Lagerelement 30 ein weiteres Rohr 47 befestigt, das über eine Kupplung 35 mit einem zentralen Absaugkanal 37 in Verbindung steht. Der Absaugkanal 37 ist dabei mit einer Unterdruckquelle UP verbunden.As in particular from the partial view Y (nach FIG. 2a ) of the FIG. 2b can be seen, the upper outer surfaces F and a part of the lateral outer surfaces F of the flanges F1, F2 are covered by the correspondingly shaped flap 17. In this case, following the axis 18 on the flap 17 webs 23 and 24 are provided which cover the lateral outer surfaces F of the flanges F1, F2 up to the webs 32, 33. The axes 18, about which the flap 17 is pivotally mounted, are attached to the suction element 15. In the view after FIG. 2b is also seen that the central web 26 which is fixed to the flap 17 extends over the entire length of the outer surfaces FG. Thus, the seal is ensured in the area between the inner outer surfaces FG, even if they would have by squeezing a small distance from each other. The suction tube 22 has a tapered end 46, which opens into a circular pipe end 47. At the pipe end 47, a flange 48 is provided, via which the tube 22 is received and stored in a groove 50 of a bearing element 30. The usually made of rubber bearing member 30 is attached via a circumferential groove 49 on a machine frame MR. To assist the assembly of the tube 22 in the bearing element 30, an insertion aid EF is provided on the bearing element, which extends umbrella-like about half the circumference of the tube 22. Following the pipe end 47 of the suction tube 22, a further tube 47 is fixed in the bearing element 30, which is connected via a coupling 35 with a central suction channel 37 in connection. The suction channel 37 is connected to a vacuum source UP.

Die Montage der Saugeinheiten 10, 10a erfolgt wie auch deren Verriegelung in einfachster Weise und kann schnell und problemlos durchgeführt werden. Dabei werden die jeweiligen Saugeinheiten 10, 10a über die an ihnen befestigten Führungsstege 21 nacheinander oberhalb der Führung 16 in der jeweiligen Gleitschiene 14 in die, in Figur 2 (bzw. Figur 3) gezeigte Stellung verschoben, bis die Anschlagflächen A1, bzw. A2 auf der Anschlagfläche A zur Anlage kommen. Anschliessend wird die, sich noch in Offenstellung befindliche Klappe 17 um die Achsen 18 in die in Figur 4 gezeigte Verriegelungsstellung verschwenkt, wobei einerseits der Riegel 28 in die Ausnehmung 29 eingerastet wird und andererseits die Kante 27 des Mittelsteges 26 zwischen die beiden Aussenflächen FG der Flansche F1, F2 bewegt wird. Über den Mittelsteg 26 wird einerseits eine Druckkraft auf die Flansche F1, F2 in Richtung der Anschlagfläche A1 erzeugt und andererseits werden diese gegen die seitlichen Stege 32 und 33 des Saugelementes 15 gedrückt. Dadurch werden die Flansche F1, F2 und somit auch die Saugeinheiten 10, 10a in ihrer Lage fixiert und der Innenraum der Saugkanäle 12, 12a und des Rohres 22 im Bereich der Kupplungsstelle KS nach aussen hin abgeschottet. Durch das Umgreifen der Aussenflächen F der Flansche F1, F2 durch die Stege 31, 32 und 33 sowie durch die Klappe 17 mit den an ihr befestigten Stegen 23 und 24 wird eine zusätzliche umlaufende Abdichtfläche im Bereich der Flansch F1, F2 erzeugt.The assembly of the suction units 10, 10 a as well as their locking in the simplest way and can be performed quickly and easily. In this case, the respective suction units 10, 10a via the attached guide webs 21 successively above the guide 16 in the respective slide rail 14 in the, in FIG. 2 (respectively. FIG. 3 ) shown shifted position until the stop surfaces A1, and A2 come to rest on the stop surface A. Subsequently, the flap 17 is still in the open position about the axes 18 in the in FIG. 4 shown locking position pivoted, on the one hand, the latch 28 is engaged in the recess 29 and on the other hand, the edge 27 of the central web 26 between the two outer surfaces FG of the flanges F1, F2 is moved. On the one hand a pressure force on the flanges F1, F2 generated in the direction of the stop surface A1 and on the other hand they are pressed against the lateral webs 32 and 33 of the suction member 15 via the central web 26. As a result, the flanges F1, F2 and thus also the suction units 10, 10a are fixed in their position and the interior of the suction channels 12, 12a and the tube 22 in the region of the coupling point KS sealed off to the outside. By embracing the outer surfaces F of the flanges F1, F2 by the webs 31, 32 and 33 and by the flap 17 with the webs 23 and 24 attached to it, an additional circumferential sealing surface in the region of the flange F1, F2 is generated.

Claims (4)

  1. A suction device for compacting air from two exchangeable suction units (10, 10a) on a twin drafting roller system (2z) of a spinning machine (10, 10a) for the aerodynamic compacting of fiber material (V) that is guided across respectively one suction zone (Z) of compacting elements (6, 6a) provided with perforations (OE) and located directed toward from each other, and wherein the suction unit that is allocated to the respective compacting element is provided with a suction orifice (11, 11 a) that is connected to a suction channel (12, 12a) integrated in the respective suction unit and with a suction tube (22) allocated to the suction units (10, 10a) including a suction element (15) through which the compacting air that is suctioned off via the suction units (10, 10a) is released from the suction device, and wherein the output openings (01, 02) of the respective suction channel (12, 12a) are located opposite of an opening (O) of the suction tube at a coupling location (KS), and the suction element (15) includes guides (16) and holding means (17) by means of which the suction units (10, 10a) are held and fixed in place in relation to the respective compacting element (6, 6a)
    characterized in that the output openings (01, 02) of the suction units (10, 10a) include each a rectangular circumferential flange (F1, F2) with a plane contact surface (A1, A2) and that rest at a common coupling location (KS) adjacently relative to each other on a circumferential, plane contact surface (A) of a common, rectangular opening (O) of the suction tube (22), and wherein the flanges (F1, F2) completely cover by means of the output orifices (01, 02) of the suction units the orifice (O) of the suction tube (22) and are held by the holding means (17) by a compressive force against the contact surface (A).
  2. The suction device according to claim 1 characterized in that the suction element (15) is designed in the area of the contact surface (A) and the holding means (17) in such a way that, in the latched position of the holding means (17), the exposed exterior surfaces (F) of flanges (F1, F2) of the suction units (10, 10a) are covered.
  3. The suction device according to claim 2 characterized in that the suction element (15) includes, at a distance relative to the narrow sides of the rectangular opening (O), laterally affixed bars (32, 33) upon which the flanges (F1, F2) of the suction units (10, 10a) located adjacent to each other and directed towards the bars rest at least partially.
  4. The suction device according to claim 3 characterized in that the external surfaces (FG) of the flanges (F1, F2) of the suction units (10, 10a) are, when the same are in their latched position directed toward each other, with regard to their respective contact surface (A1, A2) at an angle (c) that is smaller than 90° and in that the holding element (17) includes a middle bar (26) that is provided with a free edge (27) extending at an acute angle (d) and that engages in the latched position between the external surfaces (FG) of the flanges (F1, F2) that are directed toward each other.
EP12004346.8A 2011-07-25 2012-06-08 Compaction sensor for a spinning machine Active EP2551389B1 (en)

Applications Claiming Priority (1)

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CH01244/11A CH705310A1 (en) 2011-07-25 2011-07-25 Suction device for the compression air from two interchangeable suction units on a twin drafting of a spinning machine.

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DE102020126876A1 (en) 2020-10-13 2022-04-14 Maschinenfabrik Rieter Ag Compression device for a spinning machine

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JP7251345B2 (en) * 2019-06-19 2023-04-04 株式会社豊田自動織機 Spinning frame
CN110453376A (en) * 2019-08-06 2019-11-15 深圳全棉时代科技有限公司 A kind of method of the production non-woven cloth of gas thorn reinforcement fiber web

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JPS5735579Y2 (en) * 1978-03-22 1982-08-06
JPH0725313U (en) * 1993-10-19 1995-05-12 株式会社京宗技研 Duct connection clip
JP3826558B2 (en) * 1998-03-25 2006-09-27 村田機械株式会社 Air supply system for spinning machines
DE10145444A1 (en) * 2001-09-14 2003-04-03 Rieter Ag Maschf Spinning machine equipped with pneumatic sliver compacting, has compacting unit carried by suction pipe with a floating mounting
JP2004107830A (en) * 2002-09-19 2004-04-08 Mas Fab Rieter Ag Spinning machine equipped with bundling device
DE102005044967B4 (en) * 2005-09-20 2015-06-03 Maschinenfabrik Rieter Ag Extraction device for a drafting system
CN100422409C (en) * 2006-02-21 2008-10-01 宁波韵升股份有限公司 Air guide device for fiber strip collector of spinning machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020126876A1 (en) 2020-10-13 2022-04-14 Maschinenfabrik Rieter Ag Compression device for a spinning machine

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CN202830294U (en) 2013-03-27
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EP2551389A2 (en) 2013-01-30
JP2013023808A (en) 2013-02-04

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