EP2329066B1 - Air jet spinning unit having spindle-shaped component - Google Patents

Description

The invention relates to an air jet spinning unit with a spindle-shaped component, which has a thread withdrawal channel with an inlet opening and which is located in a vortex chamber, starting from an operating position in which a tapered spindle tip of the spindle-shaped component, which contains the inlet opening of the thread withdrawal channel To spin fiber structure by a rotating air flow spinning spin can be dispensed, along the yarn withdrawal channel and in the yarn withdrawal direction is displaceable, wherein by moving the spindle-shaped component in the direction mentioned the spindle fungus is movable out of the vortex chamber.

The invention further relates to a spindle-shaped component for an air jet spinning unit with a yarn withdrawal channel, with a cylindrical sliding surface for receiving the air jet spinning unit and with a tapered spindle tip containing the inlet opening of the yarn withdrawal channel, wherein the spindle-shaped member has a magnetic bearing surface for fixing the spindle-shaped component in contains its operating position in the air jet spinning unit.

An air jet spinning unit of the type mentioned is from the DE 10 2004 044 345 A1 known. To move the spindle-shaped component, a spring and a pneumatic cylinder are integrated in the known air jet spinning unit. The complicated structure of the air jet spinning unit makes the production consuming.

From the DE 195 01 545 A1 An air jet spinning unit is known in which the movement and holding devices for the spindle-shaped component are not integrated in the air jet spinning unit. The spindle-shaped component is connected to a cylinder arranged outside the air jet spinning unit and can thereby be moved along the yarn withdrawal channel. When moving the spindle-shaped component, the air jet spinning unit is completely opened. The external pneumatic cylinder requires a lot of space in the air jet spinning device.

Finally, the shows EP 1 748 094 A1 a spinning device for producing a thread by means of a circulating air flow, wherein the air spinning device comprises a arranged in a spinning housing, rotatably mounted about its central longitudinal axis, hollow spinning cone and for generating the circulating air flow is acted upon with compressed air nozzle block. In addition, it is provided that the spinning cone is mounted on a magnetic bearing assembly in the rear housing part so that the installation angle position of the spinning cone within the air spinning device is selectively adjustable.

The invention has for its object to provide an air jet spinning unit with a simplified structure.

The object is achieved in that the air jet spinning unit has at least one magnet for holding the spindle-shaped component in its operating position, a bearing surface of magnetic material cooperating with the magnet and with the aid of which the spindle-shaped component is movable starting from its operating position in the yarn withdrawal direction, to thereby move the spindle tip out of the vortex chamber. In the case of the spindle-shaped component, the object is achieved in that the spindle-shaped component has a groove into which projections of a lever fastened to a base body of the air nozzle spinning unit can be clipped in order to move the spindle-shaped component.

The only holding means for the spindle-shaped component in the air jet spinning unit is a magnet. Of course, several magnets can be provided. Other fasteners and retaining means are on the air jet spinning unit or not required on the spinning device. The manufacturing and assembly costs for the air jet spinning unit is thereby greatly simplified.

The spindle-shaped component is held in its operating position in the air jet spinning unit, that a tapered spindle tip of the spindle-shaped component, which contains the inlet opening of the yarn withdrawal channel, is located in a swirl chamber, in which the spin-fiber structure by a rotating air flow spinning spin is granted. It is known that in the air jet spinning unit malfunctions can occur and the vortex chamber must be cleaned. To rectify malfunctions, the spindle-shaped component is moved parallel to the thread withdrawal channel in the thread withdrawal direction, so that the spindle tip moves out of the vortex chamber. Fiber accumulations in the vortex chamber can thus be eliminated.

The invention has the advantage that for the movement of the spindle-shaped component no complicated and / or very much space-claiming structures are required. The spindle-shaped component can be accommodated in a simple cylindrical receptacle in a base body of the air jet spinning unit and can be moved along the cylindrical receptacle. For holding the spindle-shaped component in its operating position, at least one magnet can be arranged in the base body. The magnet cooperates with the magnetic abutment surface on the spindle-shaped component and holds the spindle-shaped component in its operating position. According to another advantageous embodiment, at least one magnet can be arranged on the spindle-shaped component or a holding element connected thereto. The magnet cooperates in this embodiment with a magnetic contact surface on the base body of the air jet spinning unit. In both embodiments, the spindle-shaped component can be moved counter to the magnetic force in the yarn withdrawal direction along the yarn withdrawal channel to eliminate malfunction so that the spindle tip moves out of the vortex chamber.

In the simplest case, the movement of the spindle-shaped component can be done manually by maintenance personnel. Due to the simple attachment of the spindle-shaped component, it is also possible to very easily remove the spindle-shaped component from the air jet spinning unit and replace it with another spindle-shaped component.

It can also be advantageous that the movement of the spindle-shaped component takes place by means of a maintenance device which can be moved along the air-spinning machine, a so-called service robot.

According to the invention, a lever, in particular a pivot lever, is provided for moving the spindle-shaped component. The lever is attached to the base body and only clipped on the spindle-shaped component, so that the spindle-shaped component is still very easily replaceable.

The magnetic contact surface for fixing the spindle-shaped component in its operating position is preferably annular and may be arranged concentrically to the cylindrical sliding surface. In an advantageous embodiment, the spindle-shaped component consists of several components, preferably of three components. A first component contains the cylindrical sliding surface. The first component preferably consists of a material which has good sliding properties in relation to the material of the main body. Advantageous for the first component is a plastic or a brass or bronze material. The cylindrical sliding surface may also have a coating. The second component of the spindle-shaped component contains the tapered spindle tip with the inlet opening of the thread withdrawal channel. The conical outer contour of the second component is preferably divided into areas with different conicity, wherein the cone angle decreases towards the spindle tip. A third component of the spindle-shaped component may include the magnetic bearing surface for fixing the spindle-shaped component in its operating position. The third component is preferably formed by a steel ring attached to the first component.

In another advantageous embodiment, it is provided that the spindle-shaped component consists of two components. This embodiment is advantageous if the first component consists of a magnetic material, for example of steel. The magnetic contact surface for fixing the spindle-shaped component in its operating position can then be integrated into the first component, so that it is possible to dispense with the third component. The spindle-shaped component thus consists of a first component containing the cylindrical sliding surface and the magnetic bearing surface, and of a second component containing the spindle tip.

In a further advantageous embodiment, it can be provided that the spindle-shaped component has an injection channel opening into the thread withdrawal channel and a compressed air connection for supplying the injection channel. The compressed air connection is suitable for attaching a compressed air hose. The injection channel can be acted upon for a piecing process with compressed air, so that in the yarn withdrawal channel creates a defined air flow. Through the injection channel directed to the spindle tip air flow can be generated in the thread withdrawal channel, which serves for returning a thread end counter to the thread take-off direction by the air jet spinning unit. It can also be provided that a rotating air flow in the yarn withdrawal channel can be generated by the injection channel. A rotating air flow in the thread withdrawal channel is particularly advantageous if a piecing without auxiliary thread is to be performed.

The invention has the advantage that the length of the thread withdrawal channel in the spindle-shaped component can be relatively small. The shortest possible thread withdrawal channel in the spindle-shaped component can reduce a deterioration of the thread quality, which can be caused by excessive contact of the spun thread with the wall of the thread withdrawal channel. Advantageously, the length of the yarn withdrawal channel in the spindle-shaped component is less than 80 mm, and in particular less than 40 mm.

Further advantages and features of the invention will become apparent from the following description of an embodiment.

• Figur 1 eine vergrößerte Darstellung eines erfindungsgemäßen Luftdüsenspinnaggregates im Längsschnitt,
• Figur 2 eine Draufsicht in Richtung des Pfeiles II der Figur 1.

Show it:

• FIG. 1 an enlarged view of an air jet spinning unit according to the invention in longitudinal section,
• FIG. 2 a plan view in the direction of arrow II of FIG. 1 ,

This in FIG. 1 illustrated air jet spinning unit 1 is used to produce a spun yarn 2 from a staple fiber 3. The air jet spinning unit 1 is a drafting 4 upstream.

The staple fiber staple 3 is fed in drafting 4 in the direction of delay A and withdrawn as spun yarn 2 in the yarn withdrawal direction B and forwarded to a winding device, not shown. The drafting unit 4, which is only partially shown, is preferably a three-cylinder drafting unit and thus comprises a total of three pairs of rollers, each having a driven lower roller and an upper roller designed as a pressure roller. Shown is only the delay zone of the drafting 4 limiting delivery roller pair 5, 6. In such a drafting 4 is warped in a known manner, the staple Elaband 3 to a desired fineness. Following the nip line of the delivery roller pair 5, 6 of the drafting system 4 is then a thin fiber ribbon 7, which is finished stretched and still untwisted.

The air jet spinning unit 1, the fiber ribbon 7 is fed via a Faserzuführkanal 8. It follows a so-called vortex chamber 9, in which the fiber ribbon 7, the spinning rotation is granted, so that the spun yarn 2, which is withdrawn through a yarn withdrawal channel 10, is formed.

A fluid device generates during the spinning process in the vortex chamber 9 by blowing compressed air through tangentially opening into the vortex chamber 9 Drurkluftdüsen 11 a rotating vortex flow. The compressed air is supplied in the air jet spinning unit 1 during operation via a compressed air channel 12. From the compressed air channel 12, the compressed air passes first into a surrounding the vortex chamber 9 annular channel 13, to which said compressed-air nozzles 11 are connected directly. The emerging from the compressed air nozzles 11 compressed air is discharged through an exhaust duct 14. The exhaust duct 14 is annularly arranged around a spindle-shaped component 15 which contains the yarn withdrawal channel 10. The spindle-shaped component 15 is stationary during operation.

In the area of the swirl chamber 9, an edge of a fiber guide surface 16 is arranged as a swirl barrier, which is arranged slightly eccentrically to the yarn withdrawal channel 10 in the region of its inlet opening 17. The inlet opening 17 of the thread withdrawal channel 10 is arranged at a conically tapering end of the spindle-shaped component 15. The tapered end is referred to as a spindle tip 18.

In the air jet spinning unit 1, the fibers to be spun are held on the one hand in the fiber ribbon 7 and thus guided by the Faserzuführkanal 8 substantially without rotation division in the inlet opening 17 of the yarn withdrawal channel 10. On the other hand, the fibers are in the range between the fiber feed channel 8 and the thread withdrawal channel 10 the effect of the vortex flow in the vortex chamber 9 exposed. As a result of the turbulent flow, the fibers or at least their end regions are driven radially away from the inlet opening 17 and wrapped around the fibers already entering the yarn withdrawal channel 10. The yarns 2 made with the described air jet spinning units 1 therefore exhibit a core of fibers or fiber portions extending substantially in the yarn longitudinal direction without substantial rotation and an outer portion in which the fibers or fiber portions are rotated around the core. An air jet spinning device of this type allows very high spinning speeds, which are on the order of between 300 and 600 meters per minute.

If, for some reason, the fiber ribbon 7 or the thread 2 breaks, the drafting unit 4 is first stopped and the supply of the staple fiber strand 3 is interrupted. The unwinding device, not shown, is turned off. Before restarting the spinning process, it may be necessary to free the vortex chamber 9 of fiber residues hanging there. For this purpose, the spindle-shaped component 15 is displaced along the yarn withdrawal channel 10 in the yarn withdrawal direction B, so that the spindle tip 18 moves out of the swirl chamber 9. The vortex chamber 9 clogging fiber accumulations can then be sucked off via the connected to a vacuum source, not shown exhaust air duct 14.

A main body 19 of the air jet spinning unit 1 has a cylindrical receptacle 20, in which the spindle-shaped component 15 is movably inserted with a cylindrical sliding surface 21. In the main body 20, one or more magnets 22, in the illustrated case two magnets 22, are arranged. The spindle-shaped component 15 has a bearing surface 23, which cooperates with the magnet 22, of a magnetic material. The magnets 22 hold the spindle-shaped component 15 in its operating position. The magnetic Contact surface 23 is annular. The contact surface 23 and the cylindrical sliding surface 21 are arranged concentrically around the yarn withdrawal channel 10.

To clean the vortex chamber 9, the spindle-shaped component 15 can be moved counter to the magnetic force in the yarn withdrawal direction B along the cylindrical sliding surface 21. The movement of the spindle-shaped component 15 can be carried out manually by an operator or by a maintenance trolley movable along the air-spinning machine. In order for the spindle-shaped component 15 to be easily gripped, a lever 24 for moving the spindle-shaped component 15 is provided. The lever 24 is in FIG. 2 recognizable. The lever 24 is designed as a pivot lever and fixed by means of a pivot axis 25 on the base body 19 of the air jet spinning unit 1. The lever 24 has projections 26 which are clipped in a groove 27 of the spindle-shaped component. The lever 24 can be operated manually or automatically in its gripping area 28 and thereby moves the spindle-shaped component 15 parallel to the thread withdrawal channel 10. The lever 24 prevents at the same time that after moving away the contact surface 23 from the sphere of action of the magnets 22, the spindle-shaped member 15 by itself the cylindrical receptacle 20 of the main body 19 falls out. If it is necessary to remove the spindle-shaped component completely from the air jet spinning unit 1, the spindle-shaped component 15 can be easily clipped out of the lever 24 with its groove 27 and removed from the air jet spinning unit 1. By pivoting back the lever 24, the spindle-shaped component 15 is again moved counter to the yarn withdrawal direction B and the spindle tip 18 returns to its operating position in the swirl chamber 9. The magnets 22 fix the spindle-shaped component 15 on the contact surface 23rd

In the spindle-shaped component 15 an opening into the thread withdrawal channel 10 injection channel 29 is provided. Furthermore, a compressed air connection 30 is present on the spindle-shaped component 15, which is used to supply the injection channel 29 can be acted upon temporarily compressed air. The compressed air connection 30 is formed by a connecting piece 37 for a compressed air hose, not shown. The injection channel 29 serves to support a piecing process of the air jet spinning unit 1 and can in the in FIG. 1 illustrated manner in the yarn withdrawal channel 10 open, so that the air flowing through the injection channel 29 compressed air in the yarn withdrawal channel 10 generates a counter to the yarn withdrawal direction B directed air flow. In this way, one end of a finished spun yarn 2 against the yarn withdrawal direction B through the air jet spinning unit 1 is returned to the drafting unit 4 and connected there with the staple fiber strand 3. In an embodiment not shown, the injection channel 29 may also open into the thread withdrawal channel 10 in such a way that a rotating air flow is created in the thread withdrawal channel 10.

The spindle-shaped component 15 consists of three components 31, 32, 33. A first component 31 of the spindle-shaped component 15 contains the cylindrical sliding surface 21, a part of the thread withdrawal channel 10 and the compressed air connection 30. If a lever 24 is provided, the first component 31 contains also the groove 27. A second component 32 forms the tapered end of the spindle-shaped member 15 and includes the spindle tip 18 and the inlet opening 17 of the thread withdrawal channel 10. The injection channel 29 extends from the compressed air port 30 through the first component 31 and the second component 32 and opens within the second component 32 in the thread withdrawal channel 10. The first component 31 of the spindle-shaped member 15 is made of a plastic. The cylindrical sliding surface 21 thus has good sliding properties relative to the receptacle 20 in the base body 19. Preferably, the sliding surface 21 has a diameter of 15 to 20 mm.

A third component 33 of the spindle-shaped component 15 is provided, which contains the magnetic contact surface 23. The third component 33 consists of a steel ring attached to the first component 31. Of the Steel ring 33 may, for example, be pressed onto the cylindrical sliding surface 21 or secured by threaded pins, not shown. The distance between the contact surface 23 and the spindle tip 18 in the region of the inlet opening 17 is important for the properties of the spun yarn 2. By changing the distance from the spindle tip 18 to the contact surface 23 can be varied, how far the spindle tip 18 in the vortex chamber 9 protrudes. Different mass can be achieved, for example, if otherwise the same dimensions only the height of the steel ring 33 is changed. In this case, steel rings 33 can be used with different height dimensions or it can be adjusted by a use of washers between the first component 31 and the steel ring 33, the position of the contact surface 23. This also tolerances on the spindle-shaped member 15 can be compensated. It is also possible to machine an otherwise finished spindle-shaped component 15 in a final operation on the abutment surface 23 in order to ensure an exact spacing of the spindle tip 18 from the abutment surface 23.

The spindle component 18 containing the second component 32 is inserted via cylindrical receiving surfaces 34 in the first component 31 and fixed by a threaded pin 35. In order to seal the transition of the injection channel 29 from the first component 31 into the second component 32, the receiving surfaces 34 may be associated with sealing rings 36. The second component 32 can also be pressed into the first component 31 in an embodiment not shown, then the threaded pin 35 and the sealing rings 36 could be dispensed with. The second component 32 has on its outer contour a double cone, which adjacent to the spindle tip 18 has a small cone angle and, subsequently, a large cone angle.

In the region of the outlet opening 38 of the thread withdrawal channel 10, a wear-resistant insert 39 can be inserted into the spindle-shaped component. The insert 39 may be made of ceramic and is in the first component 31st used. To avoid negative influences on the thread 2, the thread withdrawal channel 10 is made as short as possible. The length of the yarn withdrawal channel 10 from the inlet opening 17 to the outlet opening 38 is about 40 to 60 mm.

Claims (12)

1. An airjet spinning unit (1) with a spindle-shaped component (15) comprising a yarn withdrawal channel (10) with an entry opening (17) and being movable along the yarn withdrawal channel (10) and in the direction of the yarn draw-off starting from an operating position in which a conically tapering spindle tip (18) of the spindle-shaped component (15), which spindle tip (18) is containing the entry opening (17) of the yarn withdrawal channel (10), is located in a vortex chamber (9), where a fibre strand (7) to be spun receives a spinning twist by a rotating air flow, wherein by moving the spindle-shaped component (15) in the said direction the spindle tip (18) can be moved out of the vortex chamber (9), characterized in that the airjet spinning unit (1) comprises at least one magnet (22) for holding the spindle-shaped component (15) in its operating position, a contact surface (23) made from a magnetic material which interacts with the magnet (22), and a lever (24) for moving the spindle-shaped component (15) starting from its operating position in the yarn draw-off direction (B) to move the spindle tip (18) out of the vortex chamber (9).
2. An airjet spinning unit according to claim 1, characterized in that the magnet (22) is arranged in a base body (19) of the airjet spinning unit (1).
3. An airjet spinning unit according to claim 1, characterized in that a magnet (22) is arranged on the spindle-shaped component (15).
4. An airjet spinning unit according to any one of the claims 1 to 3, characterized in that the airjet spinning unit (1) comprises a cylindrical holding fixture (20) for the spindle-shaped component (15), said spindie-shaped component (15) being movable along said holding fixture (20).
5. An airjet spinning unit according to any one of the claims 1, 2 or 4, characterized in that the spindle-shaped component (15) comprises the contact surface (23) made from a magnetic material which interacts with the magnet (22).
6. A spindle-shaped component for an airjet spinning unit (1) comprising a yarn withdrawal channel (10) with a cylindrical sliding surface (21) for mounting in the airjet spinning unit (1) and with a conically tapering spindle tip (18) which comprises an entry opening (17) of the yarn withdrawal channel (10), wherein the spindle-shaped component (15) comprises a magnetic contact surface (23) for fixing the spindle-shaped component (15) in its operating position in the airjet spinning unit (1), characterized in that the spindle-shaped component (15) comprises a groove (27) where projecting elements (26) of a lever (24) can be clipped in, which lever (24) for moving the spindle-shaped component (15) is fixed on the base body of the airjet spinning unit (1).
7. A spindle-shaped component according to claim 6, characterized in that the magnetic contact surface (23) is annular in shape.
8. A spindle-shaped component according to claim 6 or 7, characterized in that the magnetic contact surface (23) is arranged concentrically to the cylindrical sliding surface (21).
9. A spindle-shaped component according to any one of the claims 6 to 8, characterized in that the spindle-shaped component (15) comprises an injector channel (29) which runs into the yarn withdrawal channel (10), and also comprises a compressed air supply (30) for supplying the injection channel (29).
10. A spindle-shaped component according to any one of the claims 6 to 9, characterized in that the spindle-shaped component (15) consists of three components (31, 32, 33), wherein a first component (31) comprises the cylindrical sliding surface (21), wherein a second component (32) comprises the spindle tip (18), and wherein a third component (33) comprises the magnetic contact surface (23).
11. A spindle-shaped component according to claim 10, characterized in that the first component (31) is made from a synthetic material.
12. A spindle-shaped component according to claim 10 or 11, characterized in that the third component (33) is a steel ring fixed to the first component (31).

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