EP2233618B1 - Spinning frame with fibre extraction device - Google Patents

Abstract

The machine has a thread suction opening (103) attached to spinning points. A locking mechanism is provided with a locking body (101) i.e. covering flap. The mechanism is attached at the thread suction opening. The locking body is held against the opening. The locking body comprises a guiding unit (112) in form of tongue, where pressure force acts on the guiding unit, during spinning operation at the points. The body is held at the opening by the pressure force that occurs against resetting force acting on the body under minimizing an air passage section at a thread suction tube (102).

Description

The invention relates to a spinning machine having a plurality of spinning stations, each containing a drafting and a twisting device, and with a Fadenabsaugeinrichtung, wherein the Fadenabsaugeinrichtung has a plurality of Fadenabsaugrohre each having at least one Fadenabsaugöffnung for sucking a sliver after a yarn break, wherein the spinning stations respectively a Fadenabsaugöffnung is associated with an air passage cross-section.

For spinning machines, such. As ring spinning machines, it comes back to thread breaks repeatedly during spinning. That is, the sliver is separated in a section between the pair of delivery rollers of the drafting unit and the yarn package, thus interrupting the spinning process. The drafting system, which is usually not driven individually, on the other hand, continues to work and continues to supply the swirl generating device with a material template. This, continuously emerging from the drafting sliver must now be removed continuously so that it does not lead to contamination of the spinning station and other thread breaks in the vicinity of the spinning station.

For discharging this sliver a Fadenabsaugeinrichtung is provided on the spinning machine, which contains leading to the spinning stations Fadenabsaugrohre, which are arranged close to the emerging from the drafting fiber flow. That is, the respective Fadenabsaugrohr is disposed in the vicinity and the output side of the delivery roller pair of the drafting system.

Such a device describes z. B. the DE 36 42 820 and the GB 954 127 , According to the two publications mentioned above, the mouth of the yarn suction tube, viewed from the swirl generating device in the direction of the drafting device, lies on the output side below the output cylinder of the drafting system and behind the sliver. The mouth of the Fadenabsaugrohres should be as close to the sliver, but only so close that the spinning process is not affected by the presence of the Fadenabsaugrohres.

The EP 1 425 449 In turn, a suction tube for a compression spinning machine, which is arranged on the output side in the region of the output cylinder, wherein the mouth of the swirl generating device in the direction of drafting viewed in front of the sliver and is directed in the direction of the rotational locking gap of the delivery roller pair.

The suction systems commonly used today have the disadvantage that they constantly suck air during spinning over all Fadenabsaugrohre regardless of the presence of a yarn breakage. Although the suction also has the purpose to keep the spinning station in the area of the delivery roller pair of flight and dirt free, but the suction of the Fadenabsaugrohres, which is indeed designed for one of the rarely occurring thread breaks, designed for this cleaning task way too high.

In a long spinning machine with 1,200 to 1,600 spinning units, an excessively high suction power is of great importance with regard to the resulting energy costs. Furthermore, a high Gesamtabsaugleistung also means a correspondingly large dimensions of the suction units, such. B. drives, fans; this with a corresponding cost.

In an effort to reduce the energy consumption of the spinning machines, but without having to accept disadvantages in the operation of the spinning machine, the Applicant has set itself the task of proposing a Fadenabsaugvorrichtung, the suction at the mouth of the Fadenabsaugrohrs after the presence of a thread break at the respective spinning station directed.

The object is achieved in that the Fadenabsaugöffnung each having a shut-off mechanism is associated with a shut-off, and the obturator is movably supported relative to the Fadenabsaugöffnung, and the obturator includes guide means, which are such that a compressive force acts on them during the spinning operation, said Shut-off is held by this pressure force with reduction of the air passage cross-section of the suction tube against a force acting on the obturator restoring force on the Fadenabsaugöffnung.

The term "thread" can be understood in this application both a non-twisted sliver and a screwed sliver, so yarn or roving. The term "spinning operation" in the present application means that yarn is produced at the corresponding spinning station, i. there is no thread break. This is independent of the operating state of the other spinning stations of the spinning machine. If there is a thread breakage, then the affected spinning station is therefore not in spinning operation.

The obturator advantageously comprises a cover flap, by means of which the Fadenabsaugöffnung can be completely or partially covered and thus the air passage cross section of the Fadenabsaugöffnung on Fadenausaugrohr changeable. The cover flap is preferably a sheet-like cover element, which is located in the spinning operation on the Fadenabsaugöffnung and this completely or at least partially covers or closes.

The cover flap or the obturator is preferably designed such that this or this reduced during the spinning operation, the air passage cross section of the Fadenabsaugöffnung, but not completely closes.

So z. B. on the obturator, in particular on the cover or in the transition region between the guide means described below and the cover flap, a recess, for. B. in the form of a notch, may be provided, which allows a limited air passage in the direction of Fadenabsaugrohr. Thus, the cover flap in its upper end region or in the transition region between the guide means and cover have such a notch. The notch can z. B. be V-shaped and have a widening towards the front edge opening. However, the notch may also be configured U-shaped or otherwise. The recess is preferably arranged centrally. However, it can also be provided off-center.

Does the obturator guide means in the form of a flat Anformung, z. Example in the form of an apron or tongue, as described below, the notch is preferably located on the cover in the transition region to the guide means. The planar Anformung can be formed at an angle to the upper end edge of the cover, wherein the planar Anformung is directed away from the suction tube in the direction of sliver.

In its guide surface facing the fiber slab to be suctioned off, the guide means itself has a recess towards the recess, which recess can be constant or increase towards the recess. So z. B. on the guide surface to a notch toward opening V-shaped recess may be provided (see also Fig. 1 and 3 ). Preferably, however, the depression is funnel-shaped, whereby it narrows towards the notch (see Fig. 11 ).

Furthermore, means, such as spacers may be provided, which cause the cover flap of the Fadenabsaugöffnung in certain zones or in a certain peripheral portion or over the entire circumference is not completely applied in the spinning operation, but still forms a gap to this, through which air can flow into the Fadenabsaugrohr. The gap can z. B. be formed laterally from or on top of the cover. In this way it is ensured inter alia that during the spinning operation at the spinning station, i. if there is no thread break, a minimum suction is present, which is sufficient to suck away flight and other contaminants from the spinning station.

The air passage opening of the type described above can also be provided on the thread suction tube itself, in particular on the edge which surrounds the suction opening.

The variants of air passage openings described above may alternatively be used with each other or in combination with each other.

The obturator has in a preferred development sealing means by means of which the lower portion of the Fadenabsaugrohröffnung is sealed completely or almost airtight in the closed state of the obturator. This ensures that air is sucked in only in an opening region arranged in the upper region of the suction tube and no false air is drawn in from below the fad extraction tube. This will increase the efficiency of the suction and the function of the obturator further improved. The sealing means may, for. B. on the obturator, in particular on the inside of the cover flap arranged enclosure, z. B in the form of a border. The border can z. B. be a bead or flange-like increase. The enclosure may include or consist of a rubber seal. The enclosure is suitably adapted to the outer or inner contour of the suction and z. B. be arcuate. The enclosure can only encompass a.) Lower region of the suction opening, b.) A lower and lateral region or c.) A lower, lateral and partially upper region. According to variant a.) The air is sucked off only in the lateral and upper area, according to variant b.) The air is sucked off only in an upper area and according to variant c.) The air is sucked off only in the area of the recess.

The sealing means, for. B. a rubber lip, also on the thread suction tube itself, z. B. at the pipe edge, which surrounds the suction opening may be provided.

The obturator is preferably via a hinge connection, in particular pivot connection, rotatably or pivotally mounted on the spinning machine, preferably on the thread suction, in particular on a Anformung the Fadenabsaugrohr stored. The cover flap is preferably connected via a support arm with the spinning machine. The cover flap is advantageously connected via the support arm by means of articulation means for rotatable articulation of the obturator, in particular for articulation with an Anformung the Fadenabsaugrohr, with the spinning machine. The hinge means can, for. B. be a swivel joint. The tube molding may be integral, i. the Fadenabsaugrohr is produced together with the Anformung together, z. B. by injection molding.

If the obturator is connected to the thread suction tube via a hinge connection, then the thread suction tube preferably has a projection with articulation means. This articulation means may comprise cylindrical cams or pins which engage in openings or depressions on the holding arm of the obturator. Conversely, the openings or depressions may also be provided on the tube forming on the thread suction tube, in which case cams on the holding arm of the shut-off device engage in the openings on the tube forming. There may be one or two such cams and be provided corresponding openings per arm. Instead of pin and through pins, z. As metal pins, be provided which connect the tabs with the tongue-shaped Anformung.

Instead of a hinge connection and other constructions are possible, which allow movement or pivoting of the obturator together with the cover against the Fadenabsaugöffnung. Thus, the obturator can be attached via an elastic, in particular spring-elastic element to the spinning machine or to a Anformung on Fadenabsaugrohr. The elastic element has a resilience, which counteracts said pressure force on the guide means. The obturator is movable or pivotable via the elastic deformation of this element relative to the Fadenabsaugöffnung. The elastic element may be an integral part of the obturator. The spring-elastic element exerts both the function as a pivoting element as well as a return element. So z. B. a shut-off device with a flexible support arm may be provided which is attached to the spinning machine, in particular at the thread suction tube, and has elastic, in particular elastic, properties.

The obturator may further include retaining means which act such that the obturator on the one hand to the Fadenabsaugöffnung and away from this is movable, on the other hand, the obturator on reaching a defined distance to the Fadenabsaugöffnung, retained by the retaining means and not further with the restoring force of the Fadenabsaugöffnung is moved away. The retaining means may include a stop on the thread suction tube or on a Anformung the Fadenabsaugrohr or on the spinning machine, to which the obturator, in particular the holding arm, is present upon reaching a defined distance between the cover and the Fadenabsaugöffnung. In this way it is prevented that the obturator swings arbitrarily far and uncontrolled from the Fadenabsaugöffnung.

On the obturator acts a restoring force, due to which the obturator moves away in the absence of or decreasing pressure force to release the suction from the suction tube. This restoring force can by the on the obturator acting gravity and / or generated by appropriate return means. The return means may be a return element, for. Example in the form of a spring element (eg., Spiral spring, coil spring, leaf spring) or a rubber-elastic element, which counteracts the pressure force on the guide means.

The Fadenabsaugrohr or the Fadenabsaugöffnung is expediently arranged on the delivery roller pair output drafting or, in a compaction spinning machine, after the rotational locking gap following the compression zone. The Fadenabsaugöffnung may be directed depending on the thread guide to the rotational locking gap or slightly set back close to the lower roller. The Fadenabsaugöffnung is preferably bevelled, wherein the upper opening edge is set back relative to the lower opening edge.

The guide means are designed such that the pressure force exerted on these acts optimally on the position of the obturator in the spinning operation. According to a first variant of the invention, the guide means, also referred to herein as air guiding means, are such that the mentioned compressive force is generated by a dynamic buoyancy on the guide means. The buoyancy is generated by a guided over the guide means air flow. For this purpose, the guide means form a flow surface over which air sucked in during the spinning operation is passed through the yarn suction tube, so that a buoyancy which acts counter to the restoring force is generated on the shut-off element. By definition, the term "dynamic buoyancy" is intended to apply quite generally to differences in the pressure potential at various points of the obturator, which are caused in connection with moving gases according to the law of Bernoulli. The terminology also applies to the case in which the restoring force is exerted not by gravity, but by a return element, the restoring forces do not have to act in the direction of gravity depending on the design of the obturator.

The guide means preferably comprise a planar Anformung, z. B. in the form of an apron or tongue on the obturator. The Anformung is preferably formed at the upper end of the obturator. The Anformung includes advantageous at an angle to the cover, in particular to the upper end edge of the cover on. The formation preferably points away from the suction tube in the direction of sliver. The planar Anformung includes a first and a, this opposite second surface. The first surface is preferably an upper surface and the second surface is a lower surface. The first surface forms a flow surface, over which in the spinning operation air, in particular through the Fadenabsaugrohr sucked air, flows. There is no or at most a noticeably smaller air flow over the second surface, so that the two-dimensional molding and with it the obturator are subjected to dynamic buoyancy. The two surfaces are preferably oriented so that they have a horizontal component.

The guiding means can, i. the planar Anformung with a first and second surface as described above, may also be formed by the cover flap itself. The cover flap includes a first outer, facing away from the suction tube and a second inner, the suction opening facing surface. The outer surfaces of the cover flap is preferably oriented so that it has a horizontal component. In this case, an additional molding on the cover flap of the type described above is dispensed with.

Between the first surface of said Anformung and a lower roller or a lower cylinder of the drafting system or a compression device, a channel-like passage is preferably formed, through which in the spinning operation air is guided in the direction of the Fadenabsaugrohres. The prevailing between the planar Anformung or the cover flap and the lower roll or sub-cylinder air flow can be generated by the air entrainment due to the rotating lower roll or lower cylinder and / or by the air suction at the Fadenabsaugöffnung.

In an advantageous development of this first variant of the invention, the obturator is designed such that when the obturator is in the spinning operation on the Fadenabsaugöffnung between obturator and Fadenabsaugrohr an air passage opening is formed, whose cross section is considerably smaller than the air passage cross section of the Fadenabsaugrohres. The air passage cross section of the air passage opening is expediently half the size of the air passage cross section of the Fadenabsaugrohres or less. The air passage cross-section of the air passage opening is preferred a third, in particular a quarter, more preferably an eighth, as large as the air passage cross section of the Fadenabsaugrohres or less.

The air passage opening is preferably so large that, in the event of a yarn break, the sliver can be sucked through the air passage opening without displacement of the obturator, in particular of the cover flap. Furthermore, the air passage opening is preferably so large that, in the event of a thread breakage and a subsequent thickening of the fiber sliver to be suctioned off, the thickening point is retained at the air passage opening. Such a thickening, which often occurs after a thread break, is called in the jargon also pull-through, torpedo or Schleicher and stirs from a fiber jam in the drafting zone of the drafting system.

The obturator is operatively connected to the shut-off mechanism in such a way that the obturator in the sliver after a thread break by the dynamic pressure of the thick passage at the air passage opening and by the restoring force permanently acting on the obturator, both directed against the buoyancy acting on the obturator are moved away from the Fadenabsaugöffnung. The thick spot exerts a kind of wedge effect on the obturator. The dynamic pressure or wedge effect and the restoring force thereby outweigh the dynamic buoyancy and generate an opening moment, thanks to which the obturator, or the cover flap, moves away from the suction tube, releasing the suction opening. By increasing the Absaugquerschnittes and by the displacement of the guide means of the lower roller or from the lower cylinder away the air flow over the first surface of the guide means decreases, so that the dynamic buoyancy is reduced or eliminated.

The aforementioned device takes into account the fact that after a yarn break for sucking off a sliver a, relative to the conventional cross section of a Fadenabsaugöffnung reduced air passage cross section is completely sufficient to reliably suck the sliver. The full cross section of the Fadenabsaugöffnung is only required if so-called pullers must be removed. These caterpillar-like fiber structures are bulky in comparison to the sliver and difficult and must therefore be sucked with increased suction power and a larger opening cross-section of the spinning unit.

The commissioning of the shut-off elements when piecing after a yarn break or when starting the spinning machine is very simple. For this purpose, only the shut-off valves by hand or with an aid on the suction of the suction tubes need to be pivoted during ongoing extraction. By the immediately generated suction air flow over the skirt or the cover flap, a dynamic buoyancy is effected, which holds the obturator at the suction opening. In contrast to the second variant of the invention described below, the activation of the shut-off elements takes place here independently of the piecing process.

According to a second variant of the invention, the guide means are such that the pressure force is generated by a pressing force of the guided past the guide means sliver.

Here, the guide means form a sliver contact region, via which the sliver in spinning operation bears against the obturator and exerts a compressive force on it. The continuous sliver acts in the spinning position in the spinning operation with the obturator in such a way that the obturator is held by the force exerted by the sliver on the sliver contact area contact pressure with reduction of the air passage cross section of the Fadenabsaugöffnung. The shut-off device is in operative connection with the shut-off mechanism in such a manner that the shut-off device moves away from the yarn suction opening during yarn breakage and elimination of the contact pressure at the sliver contact region, increasing the air passage cross-section through the restoring force acting on the shut-off member.

The obturator is moved away from the Fadenabsaugöffnung at yarn breakage and elimination of the sliver tension, or the contact pressure from the sliver, in particular by the force of gravity or the action of a restoring force of a return element.

In a further development of the invention, the obturator includes a sliver contact area and a cover, wherein the obturator and sliver contact area are formed and arranged in the spinning machine, that the contact force of the thread is directed to the obturator in the direction of movement or pivoting direction of the cover for opening the Fadenabsaugrohres.

The guide means preferably have a sliver guide edge, which rests the sliver during the spinning operation while exerting a contact pressure, wherein the contact pressure causes the obturator is held with its cover over the Fadenabsaugöffnung. The sliver guide edge is preferably formed horizontally. In a further development of the invention, a slanted edge can be arranged laterally from the sliver guide edge, the slanted edges being chamfered relative to the sliver guide edge such that the sliver can laterally be guided over the chamfer to the sliver guide edge for the purpose of positioning the cover flap over the suction tube after piecing.

The sliver contact area, in particular the sliver guide edge, may be made of a material having high resistance to abrasion by the passing yarn. This material does not have to correspond to the material of which the body of the obturator is made. Thus, the sliver contact region of a metal part, in particular metal wire, be formed, which is integrated in a shut-off device made of plastic.

However, the sliver guide region can also be designed differently. It is important that the sliver guide portion forms a support point for the sliver, which is in operative connection with the obturator in such a way that the obturator or the cover flap is moved to the Fadenabsaugöffnung and held above the sliver on the fiber sliver guide area acting Fasspannung.

The guide means particularly preferably comprise a two-dimensional molding in the form of an apron or tongue formed on the obturator, in particular on the cover flap and projecting therefrom at an angle. The size and orientation of the Anformung depends essentially on the geometry of the spinning station. The Anformung can z. B. directly by a continuation of the upper end edge of the cover be educated. The Anformung may protrude in the direction of the sliver from the obturator. The Anformung contains a sliver to the fiber band contact area, in particular sliver guide edge, possibly with beveled edges.

The obturator is preferably arranged and pivotally mounted or held such that the cover flap by the support pressure of the sliver, which this exerts on the sliver guide edge, from above, from the side and preferably from below via the Fadenabsaugöffnung displaced or feasible. The cover flap or the obturator can be designed to be feasible in particular from above or from the side via the Fadenabsaugöffnung when a return element is provided, so that the force of gravity is not required as restoring force. Incidentally, these modifications may also apply to the first and third variants of the invention, even if there are no specific embodiments for this purpose.

According to a third variant of the invention, the guide means are such that the mentioned compressive force is generated by a negative pressure acting on the guide means. The pressure force is caused by the pressure difference between the pressure in the suction tube (lower pressure) and the ambient pressure (higher pressure). The negative pressure causes the obturator when it falls below a certain distance to the suction against the restoring force pulled towards this or held there and this covers at least partially. The guide means are formed here in accordance with the cover flap itself. With regard to the air passage opening and the opening operation of the obturator in the event of yarn breakage or pull-throughs, the statements relating to the description of the first variant apply correspondingly.

The commissioning of the shut-off elements when piecing after a yarn break or when starting the spinning machine is very simple. For this purpose, only the shut-off valves by hand or with an aid on the suction of the suction tubes need to be pivoted during ongoing extraction. By acting on the cover negative pressure in the suction tube the obturator is held at the suction.

In those embodiments which operate according to the effect according to the first and third variants of the invention, it is fundamentally difficult to determine which pressure contributes the greatest contribution to the holding force. However, the described surface formation (skirt, tongue) has additional or other functions and effects as can be seen from this description, so that it can be used independently of a possible buoyancy effect in all of the aforementioned variants of the invention.

Common to all three variants of the invention is that the obturator or a cover flap provided on the obturator is preferably movably guided such that the sliver, the dynamic buoyancy and / or the negative pressure in the suction tube only has to exert a relatively low pressure force on the obturator, in order to prevent this to hold the Fadenabsaugöffnung or lead there. The obturator is further preferably tared, i. the focus of the obturator is opposite its pivot point or pivot point arranged such that the obturator with the lowest possible thread force, low buoyancy and / or negative pressure to the mouth of the suction tube is pivoting, positioning and durable and at a yarn breakage (second invention variant ) by the force of a return element or gravity automatically or (first and third variant of the invention) by the jamming force of a sliver at the air passage opening and by the restoring force against the dynamic buoyancy or the suction force of the mouth of the Fadenabsaugrohres is moved away. In a further development of the first and third variant of the invention, provision may be made for the obturator to be moved away from the thread suction opening only when a pull-through occurs due to the accumulation force of the thickening at the air passage opening.

In principle, the force required to hold the obturator in front of the suction tube against the permanently acting restoring force, as mentioned above, by each of the thread pressure or by the dynamic buoyancy or by the negative pressure in the suction tube alone or by a combination of two or all three reach the above forces.

The subject of the present patent application should also be a shut-off device as such according to the aforementioned embodiments. Said obturator is characterized in that it has a cover flap, by means of which the air passage cross section of the thread suction on the Fadenabsaugrohr is variable, a support arm, via which the cover flap is rotatably or pivotally attached to the spinning machine, and guide means, preferably in the form of an Anformung on which during the spinning operation at the spinning station, a compressive force is exercised contains. For this purpose, the retaining arm preferably contains articulation means for rotatably articulating the obturator against molding on the thread suction tube or at another point on the spinning machine.

The Fadenabsaugrohr as well as the obturator are preferably made of a plastic, in particular thermoplastic. The components are z. B. one or more parts produced by injection molding. However, the obturator can also be made of a different material, for. B. made of metal, such as aluminum.

The spinning machine is preferably a ring spinning machine. The ring spinning machine may be a conventional ring spinning machine with drafting and subsequent swirl generating device or a ring spinning machine with drafting and twist generating device and with a pneumatic compression device arranged therebetween. Furthermore, the spinning machine may also be an air-spinning machine, a hopper spinning machine, bell spinning machine or pot spinning machine or a roving machine, such as flyers. The spinning machine with the device according to the invention may be a long staple or short staple spinning machine.

The present invention has the advantage that during the spinning operation at the spinning position of the air passage cross section of the Fadenabsaugöffnung is reduced or closed. Only when a thread break or a puller occurs, the cover flap is moved away from the Fadenabsaugöffnung and the air passage cross-section is extended to its desired size, whereby the suction increases. Thus, only a small part of the spinning stations, namely those with yarn breaks, the full suction, while the remaining spinning stations have a reduced suction power. Overall, less suction is achieved during the spinning process claimed statistically considered over the period of the spinning process only a small number of spinning units thread breaks. Accordingly, the suction units, such as drives or fans, can be made smaller or the spinning machine can be equipped with additional spinning stations without the suction units must be designed for higher performance. Furthermore, the suction channels, such. B. the main exhaust duct be dimensioned smaller according to the reduced suction. The redimensioning of the suction channels and the associated suction units in turn gives a higher freedom of design when developing new spinning machines.

Another advantage of the invention is that in compression spinning, instead of resizing the suction units, the released suction power in the area of compacting can be used. Thus, while the extraction performance undergoes a reduction in the extraction of the suction, the suction power is increased during compaction. In this way, the hairiness of the spun yarn can be further reduced by an increased compaction performance while maintaining the overall performance of the suction.

Fig. 1:

eine perspektivische Ansicht einer ersten Ausführungsform von einem Ab- sperrmechanismus gemäss der ersten Erfindungsvariante;

Fig. 2a:

eine Seitenansicht vom Absperrmechanismus gemäss Fig. 1 im Spinnbetrieb;

Fig. 2b:

eine Seitenansicht vom Absperrmechanismus gemäss Fig. 1 nach Fadenbruch;

Fig. 2c:

eine Seitenansicht vom Absperrmechanismus gemäss Fig. 1 nach Fadenbruch und kurz vor einem Durchzieher;

Fig. 2d:

eine Seitenansicht vom Absperrmechanismus gemäss Fig. 1 nach Fadenbruch und Durchzieher;

Fig. 3:

eine perspektivische Ansicht einer ersten Ausführungsform von einem Ab- sperrmechanismus gemäss der zweiten Erfindungsvariante;

Fig. 4a:

eine Seitenansicht vom Absperrmechanismus gemäss Figur 3 im Spinnbetrieb;

Fig. 4b:

eine Seitenansicht vom Absperrmechanismus gemäss Figur 3 nach Faden- bruch;

Fig. 5:

eine perspektivische Ansicht einer zweiten Ausführungsform von einem Ab- sperrmechanismus gemäss der zweiten Erfindungsvariante;

Fig. 6:

eine perspektivische Ansicht der zweiten Ausführungsform von einem Absperr- mechanismus an einer Verdichtungseinrichtung gemäss der zweiten Erfin- dungsvariante;

Fig. 7:

eine perspektivische Ansicht einer zweiten Ausführungsform von einem Ab- sperrmechanismus gemäss der ersten Erfindungsvariante;

Fig. 8:

eine perspektivische Ansicht einer weiteren Ausführungsform von einem Ab- sperrmechanismus gemäss der ersten bzw. dritten Erfindungsvariante;

Fig. 9:

eine Seitenansicht vom Absperrmechanismus gemäss Fig. 8 im Spinnbetrieb;

Fig. 10:

eine weitere Ausführungsform einer Drehgelenkverbindung zwischen Absperr- organ und Fadenabsaugrohr;

Fig. 11:

eine weitere Ausführungsform eines Absperrorgans;

Fig. 12:

eine weitere Ausführungsform eines Absperrorgans.

The invention will be explained in more detail with reference to drawings. Show it:

Fig. 1:

a perspective view of a first embodiment of a barrier mechanism according to the first variant of the invention;

Fig. 2a:

a side view of the shut-off according to Fig. 1 in spinning operation;

Fig. 2b:

a side view of the shut-off according to Fig. 1 after thread breakage;

Fig. 2c:

a side view of the shut-off according to Fig. 1 after thread breakage and just before a pull-through;

Fig. 2d:

a side view of the shut-off according to Fig. 1 after thread break and pull-through;

3:

a perspective view of a first embodiment of a barrier mechanism according to the second variant of the invention;

Fig. 4a:

a side view of the shut-off according to FIG. 3 in spinning operation;

Fig. 4b:

a side view of the shut-off according to FIG. 3 after thread breakage;

Fig. 5:

a perspective view of a second embodiment of a barrier mechanism according to the second variant of the invention;

Fig. 6:

a perspective view of the second embodiment of a shut-off mechanism on a compression device according to the second variant of the invention;

Fig. 7:

a perspective view of a second embodiment of a locking mechanism according to the first variant of the invention;

Fig. 8:

a perspective view of another embodiment of a barrier mechanism according to the first or third variant of the invention;

Fig. 9:

a side view of the shut-off according to Fig. 8 in spinning operation;

Fig. 10:

Another embodiment of a hinge joint between Absperr- organ and Fadenabsaugrohr;

Fig. 11:

a further embodiment of a shut-off;

Fig. 12:

another embodiment of a shut-off.

The FIGS. 1 and 2 show a first embodiment and the FIG. 7 a second embodiment of the first variant of the invention. The Figures 3 and 4 show a first embodiment and the FIGS. 5 and 6 a second embodiment of the second variant of the invention. The FIGS. 8 and 9 show a further embodiment of the first or third variant of the invention.

The Fadenabsaugrohr 2, 102, 202 according to FIG. 1 . 3 and 8th contains a tongue-shaped Rohranformung 4,104, 204, to which a shut-off device 1,101, 201 via a hinge joint 5, 105, 205 is attached. The pivot connection 5,105, 205 consists of two on the tongue-shaped Rohranformung 4.104. 204 mounted pin, which by corresponding openings or depressions on two, the tongue-shaped Rohranformung 4, 104, 204 laterally embracing tabs 6, 106, 206; 7, 107, 207 are guided on the obturator 1, 101, 201. The pins can of course also on the tabs 6, 106, 206; 7, 107, 207 and the openings or depressions accordingly be provided in the tongue-shaped Rohranformung 4, 104, 204. The tongue-shaped Rohranformung 4, 104, 204 is an integral part of the Fadenabsaugrohres 2, 102, 202nd

The obturator has a positionable before the Fadenabsaugöffnung cover 16, 116, 216 (see also Fig. 2 . 4 and 9 ). The obturator 1, 101, 201 further includes a guide arm or support arm 8, 108, 208, which connects the cover flap 16, 116, 216 with the hinge connection 5, 105, 205. On the holding arm 8, 108, 208, a resilient, elongated retaining member 9, 109, 209 with a hook member 10, 110, 210 is mounted. The retaining member 9, 109, 209 is hooked with its hook element 10, 110, 210 via a raised edge 20, 120, 220 in a planar depression 21, 121, 221 on the tongue-shaped Rohranformung 4, 104, 204. The entanglement is such that the obturator 1, 101, 201 with its cover flap 16, 116, 216, while the Fadenabsaugöffnung 3, 103, 203 toward and away from this is movable, but that the obturator 1, 101, 201 depending on the Length of the retaining member 9, 109, 209 on reaching a certain distance to the Fadenabsaugöffnung 3, 103, 203 by the raised edge 20, 120, 220, which forms a stop in this case, pending hook element 10, 110, 210 and no more can be moved away further with the gravity of the Fadenabsaugöffnung 3, 103, 203.

Instead of in FIG. 1 and 2 . 4 and 5 such as 8 and 9 shown retaining member 9, 109, 209 with stop 20, 120, 220, the stopper and the retaining member can also be positioned elsewhere. The stop may be formed, for example, by an extension on the pipe molding below the fulcrum (as viewed from the yarn suction opening) of the obturator held rotatably or pivotally on the pipe molding (not shown). The obturator is now designed in such a way and held on the Rohranformung that this is the stop at the Rohranformung pending on reaching a maximum pivot angle and can not be pivoted further from the Fadenabsaugöffnung away. The retaining member is in this case by the support arm 8, 108, 208 even in the region of the tabs 6, 106, 206; 7, 107, 207 or by an extension on the support arm 8, 108, 208 below the tabs 6, 106, 206; 7, 107, 207 formed.

In the cover flap, an air passage opening or recess in the form of a V-shaped notch 15, 115, 215, 315 is embedded ( Fig. 1 . 3 . 8th . 11 ). The recess 15, 115, 215, 315 is arranged centrally. However, it can also be positioned off-center. The recess ensures a minimum suction even with covered, ie closed Fadenabsaugöffnung 3, 103, 203, 303. However, the recess is not a mandatory feature of the described embodiments. Rather, as already mentioned, the air passage opening can also be formed by a gap opening between cover flap 16, 116, 216, 316 and suction tube 2, 102, 202, 302. As a result, air is sucked in laterally through the gap opening. The gap opening can also be provided in addition to the recess 15, 115, 215, 315.

According to a first embodiment of the first variant of the invention FIG. 1 and 2 is formed at the upper end of the cover flap 116 at an angle to this an apron 112, which is directed away from the suction tube 102 to the sliver 117a out. FIG. 2a shows the position of the obturator 101 in the spinning operation. The skirt 112 has an upper surface 113 a and a lower surface 113 b, and forms a channel-like passage 123 together with the output lower roller 119. The obturator 101 or the skirt 112 is designed such that it has no contact with the spinning fiber 117a in the spinning operation.

The V-shaped notch 115 is disposed in the transition region between skirt 112 and cover flap 116. Further, in the guide surface of the skirt 112, a V-shaped recess 126 is inserted, which opens towards the notch 115 and recessed continuously.

If the suction opening 103 is closed by the cover flap 116, air is still sucked through the recess 115 (FIG. Fig. 2a ). A portion of this sucked air flows through the channel-like passage 123 (see arrow 111) to the recess 115 and thereby passes over the upper surface 113a of the skirt 112. Due to the lateral boundary by the skirt 112 on the one hand and the delivery roller 119 on the other hand, a so-called suction balloon 125 formed, which is a visualization of the suction. It can be seen that the suction effect thanks to the additional Limitation of the suction air flow 111 is concentrated by the skirt 112 to the sliver 117a and to the nip.

The pressure difference between the upper and lower surfaces 113 a, 113 b creates a buoyancy, which causes the obturator 101 is held against the force of gravity in the closed position on the suction tube 102. Furthermore, the pressure difference between the negative pressure in the interior of the suction tube 202 and the ambient pressure can exert a holding force on the shut-off device 201.

If a thread break occurs according to FIG. 2b the end of the sliver 117b emerging from the drafting device is detected by the suction air flow 111 and guided to the air passage opening 115. Following the induced draft, the sliver 117b is drawn through the recess 115 into the suction tube 102. The suction opening 103 remains completely or at least substantially closed by the obturator 101 and the cover flap 116.

Upon occurrence of a puller 117c, as in FIG FIGS. 2c and 2d As shown, a thick spot is sucked toward the air passage opening 115 and jammed thereon because the air passage opening 115 for the puller 117c is deliberately too small. Due to the additional dynamic pressure in combination with the influence of gravity, the obturator 101 with its cover flap 116 pivots away from the thread suction opening 103 and releases the latter. This pivoting movement goes so far until the retaining arm 109 is present with its hook element 110 on the raised edge 120 of the tongue-shaped Rohranformung 104. The puller 117c is now aspirated with maximum suction through the suction opening 103 of the Fadenabsaugrohrs 2.

In the FIGS. 2b-d For the sake of clarity, only the most relevant features have been provided with reference numbers.

According to a first embodiment of the second variant of the invention FIG. 3 the V-shaped notch 15 in the transition region between a sliver guide tongue 12 (skirt) and the cover flap 16 is arranged. Further, in the guide surface the sliver guide tongue 12 a V-shaped recess 26 is inserted, which opens to the recess 15 and continuously deepens. The sliver guide tongue 12 is arranged on the cover flap 16 at an angle to this and contains a sliver guide edge 13. On both sides of the sliver guide edge 13 is a respective oblique edge 11 is provided, which is inclined relative to the sliver guide edge 13. When piecing after a yarn breakage, the sliver is guided laterally by the operator, ie by hand, or by means of an auxiliary unit on the slanted edge 11 on the sliver guide edge 13 on which the sliver dwells during the spinning process, and over which the sliver 17a (see Fig. 4a ) by the thread tension the obturator 1 with the cover 16 to the Fadenabsaugöffnung 3 pushes out. When guiding the sliver 17a on the inclined edge 11, the obturator 1 is moved to the Fadenabsaugöffnung 3 out.

FIG. 4a shows the position of the obturator in the spinning operation. The, the delivery cylinder pair 18, 19 on the Drehsperrspalt leaving sliver 17a is pressed due to its tension and the prevailing spinning geometry and the configuration of the obturator against the sliver guide edge 13 on the sliver guide tongue 12 of the obturator 1. As a result, the obturator 1 is pivoted with its cover flap 16 about the hinge joint 5 to the thread suction 3 and out closes this at least partially. As long as the spinning process is in progress, the position of the obturator 1 remains unchanged. The obturator 1 performs at most smaller, vibration-like pivoting movements, which are caused by a variable sliver guide during lifting and lowering of the ring frame.

Due to the lateral boundary by the sliver guide tongue 12 on the one hand and the delivery roller 19 on the other hand, a so-called suction balloon 25 is formed, which is a visualization of the suction effect. It can be seen that the suction effect is concentrated through the apron 12 to the sliver 17a and to the nip thanks to the additional limitation of the suction air flow.

If a thread break occurs according to FIG. 4b drops the thread tension and the obturator 1 pivots with its cover 16 due to gravity down away from the Fadenabsaugöffnung 3. This pivotal movement goes so far until the retaining arm 9 is present with its hook element 10 on the raised edge 20 of the tongue-shaped Rohranformung 4. The Fadenabsaugöffnung 3 is now released and the Fadenabsaugrohr 2 can aspirate the exiting sliver 17b with maximum suction.

The in the FIGS. 1 . 2 and 3 . 4 described embodiments are particularly suitable for conventional ring spinning machines without pneumatic compression device, in which the rotational locking gap by the pair of delivery rollers 18, 19; 118, 119 of the drafting system is formed.

The FIGS. 5 and 6 show a second embodiment of an inventive locking mechanism according to the second variant of the invention. This shut-off mechanism is designed for a ring spinning machine with pneumatic compression device, in which for two adjacent spinning units a common Fadenabsaugrohr 32 is provided, which branches at its for the sliver 47a, 47b directed towards section in two Fadenabsaugrohrabschnitte 51a, 51b. Each of the two spinning stations is associated with a respective Fadenabsaugrohrabschnitt 51 a, 51 b.

The compacting device includes a guided on a lower roller 55, perforated compression drum 54a, 54b, over which the sliver to be compacted is guided. Following the compaction zone, the sliver 47a, 47b leaves the compaction drum 54a, 54b via a rotational locking gap. The rotational locking gap is formed by the nip line between the compression drum 54a, 54b and each one of these resting top roller 53a, 53b. The rotational locking gap is characterized by the fact that a recess of the sliver propagating from the spinning station in the direction of the compacting device is stopped at the rotational locking gap.

Each Fadenabsaugrohrabschnitt 51a, 51b forms its own Fadenabsaugöffnung 33a, 33b, which is directed towards the rotational locking gap of the respective spinning position. The Fadenabsaugrohrabschnitt 51 a, 51 b is designed such that it is guided obliquely from below to the sliver 47 a, 47 b and this engages laterally, so that the Fadenabsaugöffnung 33 a, 33 b viewed from the swirl-generating element in the direction of drafting, in contrast to the first-mentioned embodiment according to the Figures 3 and 4 , in front of the sliver 47a, 47b.

The above-described embodiment of a Fadenabsaugrohres 32 in a ring spinning machine with pneumatic compression device and the associated drafting with compression device are as far as the art and z. B. in the WO 03/023100 , whose contents with regard to the construction of the drafting system and the subsequent pneumatic compression device and with respect to the construction and arrangement of the Fadenabsaugrohres 32 relative to the compaction device to be part of this application, described in detail.

Due to the aforementioned arrangement of the Fadenabsaugöffnung 33a, 33b and a deviating from the first embodiment construction of the shut-off is necessary. The Fadenabsaugrohr 32 also includes a tongue-shaped Rohranformung 34, which is formed in the branch between the two Fadenabsaugrohrabschnitten 51 a, 51 b. The tongue-shaped Rohranformung 34 may be an integral part of the Fadenabsaugrohres 32 or a portion of the Fadenabsaugrohres 32. That is, the tongue-shaped pipe molding 34 and the yarn suction pipe 32 and a part of the yarn suction pipe 32 are made in one piece.

The tongue-shaped Rohranformung 34 has at its free end portion articulation 52 for rotatable articulation of a shut-off 31. The articulation means 52 each comprise a lateral opening into which engages a, provided on the obturator 31 pin-shaped Anformung 35 and rotatably supports the obturator 31 therein. The pin-shaped Anformung can also be arranged laterally on the Rohranformung 34, which engages in this case in a recess on the obturator. The following description refers now only to the one, with the obturator 31 shown spinning station. Instead of a pin-shaped Anformung may also be provided a pivot pin, which is guided both in a lateral opening on the tongue-shaped Rohranformung 34 and in a lateral opening at the free end portion of a holding arm 38 and the two components 34, 38 rotatably interconnected.

The obturator 31 comprises a retaining arm 38, on which a cover flap 42 is integrally formed on the section facing the thread suction opening 33b.

The cover flap 42 is in the spinning operation on the Fadenabsaugöffnung 33b and has a recess in the form of a notch 45, which forms a small air passage with the suction port closed, and thereby ensures a minimum suction for sucking fiber fly and dirt. However, the recess 45 is not a mandatory feature of the described embodiment. Rather, the air passage opening, as already mentioned, by a gap opening between cover flap 42 and suction tube 51 a, 51 b are formed. As a result, air is sucked in laterally through the gap opening. The gap opening can also be provided in addition to the recess 45.

Retaining means 62, 63 are also provided which cause the obturator 31, which can be moved away from the thread suction opening 33a, 33b, to move away from the thread suction opening 33a, 33b when the defined distance to the thread suction opening 33a, 33b is reached by the retaining means 62, 63 retained and not further away from the Fadenabsaugöffnung 33 a, 33 b is moved away. The FIGS. 5 and 6 show two alternative embodiments of such retaining means 62, 63. The retaining means 62 according to Fig. 5 is a mounted on the suction tube 51 a, 51 b cam 62, which is the exhaust from the suction opening 33 a, 33 b downwardly projecting obturator 31 when reaching a defined pivot radius, so that a further pivoting away of the obturator 31 is prevented.

The retaining means 63 according to Fig. 6 is provided on the pivot joint itself and is formed from a respective paragraph or a step in the opposite, lateral end faces of the free end portion of the support arm 38 and the tongue-shaped Rohranformung 34. The paragraphs 63 of the two end faces interlock and are arranged to each other, that, when a defined pivoting radius of the obturator 31, which pivots downward from the suction opening 33a, 33b, is present against each other and thus prevents a further pivoting away of the obturator 31.

In spinning operation, the sliver 47b of the sliver guide edge 43 of the obturator 31 is now in tension. The sliver guide edge 43 is in this case a lower edge boundary of the cover flap 42. By the thread tension is the obturator 31 pivoted with the cover flap 42 by means of rotational movement about the rotary joint connection 35 to the thread suction 33b and remains there as long as a thread tension acts. The cover flap 42 covers the Fadenabsaugöffnung 33b at least partially.

If a thread break now occurs, then the thread tension acting on the fiber band guide edge 43 falls away and the obturator 31 pivots downward with its cover flap 42 due to gravity, wherein the obturator 31 performs a rotary movement via the pivot joint 35.

For piecing the obturator 31 is pivoted with its cover 42 by hand or by means of an auxiliary unit about its axis of rotation back up the Fadenabsaugöffnung 33b, wherein the sliver 47b is laterally pushed over the bevel 44 on the sliver guide edge 43 and positioned there. Subsequently, the regular spinning process is initiated. When guiding the sliver 47a over the inclined edge 44, the obturator 31 is moved toward the thread suction opening 33b.

In the FIGS. 5 and 6 in each case only one obturator 31 is shown. It goes without saying that the Fadenausaugöffnung shown for the second 33a is provided a mirror-symmetrical to the first obturator 31 second obturator, which is rotatably mounted in the same manner as the first obturator 31 at the opposite end of the hinge 52.

The FIG. 7 shows a second embodiment of an inventive locking mechanism according to the first variant of the invention. This shut-off mechanism is designed for a ring spinning machine with pneumatic compression device, in which a common Fadenabsaugrohr is provided for two adjacent spinning units, which branches at its direction to the sliver 147b toward the section in two Fadenabsaugrohrabschnitte. Each of the two spinning stations is assigned a respective Fadenabsaugrohrabschnitt 151b. The structural design of this embodiment corresponds in essential features of the embodiment according to FIGS. 5 and 6 , which is why only a partial section of the shut-off mechanism with cover flap 142 is shown. On the designation of the same features is omitted here and instead to the description FIGS. 5 and 6 directed. This applies in particular to the restraint means. Below, only the differences between the two embodiments are worked out.

The obturator 131 is configured and positioned in the spinning operation with its cover flap 142 above the suction opening, that the sliver 147 b in contrast to the first embodiment according to FIGS. 5 and 6 is guided without contact on the obturator 131 over. The obturator 131 accordingly contains no fiber guide edge.

On the cover flap 142, an apron 160 is formed, which is at an angle to the cover 142. The cover flap 142 has in the transition region to the skirt 160 a recess 145 in the form of a V-shaped notch. Further, the air guide surface of the skirt 160 has a recess 161 in the form of a funnel-shaped trough, which narrows towards the notch 145 and continuously deepens. The notch 145 forms a small air passage to the suction opening 133b when the suction opening is closed, thereby ensuring a minimum suction power for extracting fiber fly, dirt and possibly a thread.

The recess 145 is not a mandatory feature here. Rather, as already mentioned, the air passage opening can also be formed by a gap opening between the cover flap 142 and the suction tube 151 b. As a result, air is sucked in laterally through the gap opening. The gap opening can also be provided in addition to the recess 145.

The present embodiment is particularly characterized in that the obturator or the cover flap 142 is formed and movably guided such that not a thread tension, but the dynamic buoyancy on the skirt and / or the negative pressure in the suction tube exerts a compressive force on the obturator, by means of which the cover flap 142 is held over the Fadenabsaugöffnung 133b. The obturator 131 is also preferably tared so here, ie the center of gravity of the obturator 131 is arranged opposite the pivot point such that the cover 142 with the lowest possible compressive force on the Fadenabsaugöffnung 133b is durable and after a yarn breakage and when a puller the Cover flap 142 is automatically moved away from the mouth of the Fadenabsaugrohres 151b downward by the back pressure of the thick spot at the air passage opening 145 and by gravity.

In a further embodiment of the first or third variant of the invention according to FIGS. 8 and 9 No apron or sliver guide is provided. In the upper, free edge of the cover flap 216, a recess 215 already described above is embedded in the form of a V-shaped notch, which ensures a minimum suction power even when the thread suction opening 203 is closed.

If the suction opening 203 is closed by the cover flap 216, then air is still sucked through the recess 215 (FIG. Fig. 9 ). A portion of this sucked air 211 overflows the outer surface of the cover flap 216. By the overflow of the cover flap, a buoyancy is generated, which holds the obturator 201 against gravity in the closed position on the suction tube 202. Furthermore, the pressure difference between the negative pressure in the interior of the suction tube 202 and the ambient pressure also exerts a holding force on the shut-off device 201. The obturator 201 and the cover flap 116 are formed so that they have no contact with the spinning fiber 217a guided in the spinning operation.

The obturator according 8 and 9 works with respect to the release of the suction opening in the event of a yarn breakage and pullers the same as the obturator according to Fig. 1 and 2a-d why, in this regard, in particular, the Fig. 2a-d and the associated description is made, which should also apply to this embodiment.

In the FIGS. 8 and 9 embodiment shown is particularly suitable for conventional ring spinning machines without pneumatic compression device, in which the rotational locking gap is formed by the delivery roller pair of the drafting system.

The Fig. 10 shows a further embodiment of a hinge joint 305 between a holding arm 308 of a obturator and the Rohranformung 304 a Fadenabsaugrohres. The Fadenabsaugrohr 304 includes two spaced apart Tabs 306a, 306b, each containing a depression. In the recesses cams engage 305 on the support arm 308, which together with the recesses form the hinge joint 305. Instead of the cams, a pin which traverses the holding arm 308 may also be provided.

The Fig. 11 shows a further embodiment of a recess 326, which is embedded in the upper guide surface 313a of an integrally formed on the cover flap 316 of a shut-off device 301 skirt 312. The cover flap 316 has in the transition region to the skirt 312 a recess 315 in the form of a V-shaped notch. The recess 326 has the shape of a funnel-shaped depression, which narrows towards the recess 315. The funnel-shaped recess 326 causes after a thread break better detection, guidance and suction of the thread to the suction opening 303 and recess 315 out. This is particularly important if the sliver is still changed in advance. The sucked yarn is thereby pulled toward the center of the funnel opening and thus targeted to the recess 315 out. Furthermore, the funnel shape causes bundling and thus acceleration of the sucked-in air to the suction opening 303 or recess 315. Due to the lateral boundary by the skirt 312 on the one hand and the delivery roller (not shown) on the other hand, a suction balloon 325 is formed, which represents a visualization of the suction effect. It can be seen that the suction effect remains concentrated due to the additional limitation of the suction air flow 111 through the skirt 112 and through the funnel-shaped depression 326 towards the sliver or nip (both not shown).

The described embodiment according to Fig. 11 is suitable for all variants of inventive shut-off devices and in particular for all embodiments described in this application.

The Fig. 12 shows a further embodiment of a obturator 401 with a cover 416. The cover 416 contains on its, the suction opening 403 facing inside a 42 adapted to the contour of the suction tube enclosure 422. In this example, the enclosure 422 is designed arcuate. The enclosure is characterized by a bead-like or flange-like elevation with respect to the inner surface on. The enclosure may be provided with or formed from a rubber seal. In this way, at least the lower, preferably the lower and lateral region of the suction opening is completely or almost completely hermetically sealed, so that the air is sucked in only in an upper region near the recess (not shown here). The described enclosure 422 is suitable for all variants of inventive shut-off devices and in particular for all described embodiments.

Claims (15)

1. A spinning machine having a plurality of spinning station, each containing a drafting arrangement and a twist generation device, and having a thread suction device, wherein the thread suction device has a plurality of thread suction tubes (2, 102) each having at least one thread suction opening (3, 103) for sucking off a sliver (17, 117) after a thread break, wherein a thread suction opening (3, 103) with an air passage cross section is associated with each of the spinning stations, characterized in that
   a shut-off mechanism with a shut-off element (1, 101) is associated with each thread suction opening (3, 103), and the shut-off (1, 101) is movably mounted with respect to the thread suction opening (3, 103), and the shut-off element (1, 101) contains guide means (12, 112) which are such that a compressive force acts thereon at the spinning station during spinning process, wherein the shut-off element is held by this compressive force on the suction pipe (2, 102) over the thread suction opening (3, 103) against a reset force acting on the shut-off element (1, 101) while reducing the air passage cross section.
2. The spinning machine as claimed in claim 1, wherein the guide means (112) are such that the compressive force is brought about by differences in pressure potential at different points of the guide means which are brought about in conjunction with a gas flow according to Bernoulli's law, in particular by a dynamic lift (114) at the guide means (112) which is generated by an air flow (111) which is fed over the guide means (112).
3. The spinning machine as claimed in one of claims 1 or 2, wherein the guide means (112) form a flow surface (113a) over which air sucked in through the thread suction tube (102) and/or carried by a rotating bottom roll or bottom cylinder can be fed during spinning process so that a dynamic lift (114) which acts against the reset force can be produced on the shut-off element (101).
4. The spinning machine as claimed in one of claims 1 to 3, wherein the shut-off element (1, 101) is designed and fixed to the spinning machine so that the reset force is produced by the gravitational force acting on the shut-off element (1, 101), and/or reset means which produce the reset force are provided.
5. The spinning machine as claimed in one of claims 1 to 4, wherein the guide means (12, 112) comprise a laminar molding, in particular an apron, on the shut-off element (1, 101).
6. The spinning machine as claimed in claim 5, wherein the laminar molding (112) has a first and an opposing second surface (113a, 113b), and the first surface (113a) forms a flow surface over which air, in particular air sucked in the through the thread suction tube (102), flows during spinning process.
7. The spinning machine as claimed in claim 6, wherein, at the spinning station, a channel-like passage (123) is formed between the first surface (113a) of the laminar molding (112) and a bottom roll (119) or bottom cylinder, through which air is fed in the direction of the thread suction tube (102) during spinning process.
8. The spinning machine as claimed in one of claims 1 to 7, wherein the shut-off element (1, 101) comprises a cover flap (16, 116), by means of which the air passage cross section of the thread suction opening (3, 103) on the thread suction tube (2, 102) can be varied.
9. The spinning machine as claimed in one of claims 1 to 4, wherein the shut-off element (201) comprises a cover flap (216), by means of which the air passage cross section of the thread suction opening (203) on the thread suction tube (202) can be varied, and the guide means are formed by the cover flap (216) itself.
10. The spinning machine as claimed in one of claims 1 to 9, wherein means are provided on the shut-off element (1, 101, 201) and/or on the thread suction tube such that when the shut-off element (1, 101, 201) lies over the thread suction opening (3, 103, 203) during spinning process, an air passage opening (15, 115, 215) is formed between shut-off element (1, 101, 201) and thread suction tube (2, 102, 202), the cross section of which is smaller than the air passage cross section of the thread suction tube (2, 102, 202).
11. The spinning machine as claimed in claim 10, wherein the air passage opening is sufficiently large that, in the event of a thread break, the sliver (117b) can be sucked off through the air passage opening (115) without moving or with only a small movement of the shut-off element (101), and in the event of a thickening of the sliver to be sucked off, the slub (117c) is held back at the air passage opening (115), wherein the shut-off element (101) is actively connected to the shut-off mechanism in such a way that, when a slub (117c) occurs in the sliver after a thread break, the shut-off element (101) can be moved away from the thread suction opening (103) by the back pressure of the slub (117c) at the passage opening (115) and the reset force acting on the shut-off element (101), both of which are directed against the compressive force acting on the shut-off element (101).
12. The spinning machine as claimed in claim 10 or 11, wherein a recess (15, 115, 215), preferably a notch, which constitutes an air passage opening to the thread suction tube (2, 102, 202), is arranged on the shut-off element (1, 101, 201), preferably on the cover flap (16, 16, 216) or in the transition region between the laminar molding (12, 112) and the cover flap (16, 118), in particular at the top edge of the cover flap (16, 116, 216).
13. The spinning machine as claimed in one of claims 1 to 12, wherein the shut-off element (1, 101) is rotatably mounted on the spinning machine, in particular on a molding (4, 104) on the thread suction tube (2, 102), by means of an articulated joint (5, 105).
14. The spinning machine as claimed in one of claims 1 to 13, wherein, during spinning process, the sliver (17a) rests against the guide means (12, 13) and exerts a compressive force thereon, and the guide means (12, 13) act together with the shut-off element (1) and the sliver (17a) which is fed past the thread suction tube (2) in such a way that the shut-off element (1) is held over the thread suction opening (3) by the compressive force of the sliver (17a) while reducing the air passage cross section, and the shut-off element (1) is actively connected to the guide means (12, 13) in such a way that, in the event of a thread break and loss of sliver tension, the shut-off element (1) moves away from the thread suction opening (3) as a result of the reset force acting on the shut-off element (1) while increasing the air passage cross section.
15. A shut-off element for a spinning machine as claimed in ane of Claims 1 to 14, characterized in that the shut-off element (1, 101) contains a cover flap (16, 116), by means of which the air passage cross section of the thread suction opening (13, 113) on the thread suction tube (2, 102) can be varied, a retaining arm (8, 108), by means of which the cover flap (16, 116) can be fixed to the spinning machine in such a way that it can rotate or swivel, and guide means (12, 112), preferably in the form of a molding, on which a compressive force can be exerted at the spinning station during spinning process.

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