CN110817573B

CN110817573B - Yarn storage device for spinning machine or winding machine

Info

Publication number: CN110817573B
Application number: CN201910659395.9A
Authority: CN
Inventors: M·莫拉维; V·克鲁森
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2018-08-07
Filing date: 2019-07-22
Publication date: 2023-02-17
Anticipated expiration: 2039-07-22
Also published as: DE102018119164A1; CN110817573A; EP3611295B1; EP3611295A1

Abstract

The invention relates to a yarn storage device for a spinning or winding machine, wherein the yarn storage device has a shaft section which can be rigidly connected to a bearing of the spinning or winding machine and extends in the direction of a longitudinal axis of the yarn storage device, wherein the yarn storage device has a yarn storage drum for temporarily receiving a yarn, which is rotatably mounted relative to the shaft section, wherein the yarn storage device has a yarn guide for guiding the yarn, which is rotatably mounted relative to the shaft section, wherein the yarn storage device has a first motor for driving the yarn storage drum, which has a first stator and a first rotor interacting with the first stator and connected to the yarn storage drum, and wherein the yarn storage device has a second motor operatively connected to the yarn guide, which has a second stator and a second rotor interacting with the second stator and connected to the yarn guide.

Description

Yarn storage device for spinning machine or winding machine

Technical Field

The invention relates to a yarn storage device for a spinning or winding machine, wherein the yarn storage device has a shaft section which can be rigidly connected to a bearing of the spinning or winding machine and extends in the direction of a longitudinal axis of the yarn storage device, wherein the yarn storage device has a yarn storage drum for temporarily receiving a yarn, which is rotatably mounted relative to the shaft section, wherein the yarn storage device has a yarn guide for guiding the yarn, which is rotatably mounted relative to the shaft section, wherein the yarn storage device has a first motor for driving the yarn storage drum, which has a first stator and a first rotor which interacts with the first stator and is connected to the yarn storage drum, and wherein the yarn storage device has a second motor for driving the yarn guide, which has a second stator and a second rotor which interacts with the second stator and is connected to the yarn guide.

The invention also relates to a spinning machine or a winder.

Background

In the prior art, yarn accumulators of the generic type are used in spinning or winding machines.

Corresponding spinning machines (e.g. rotor spinning machines or air jet spinning machines) are used for producing yarns made of a bundle-like fiber band (also called fiber band), wherein depending on the type of spinning machine, the yarn is spun from the fiber band by means of a spinning mechanism (e.g. a spinning rotor or an air spinning nozzle) and subsequently wound onto a reel by means of a winding device.

The winding machine is used to rewind a yarn, for example, from a yarn feeding tube of a ring spinning machine, wherein the yarn from the yarn feeding tube is wound onto a reel (also by means of a winding device). Here, a yarn defect present in the yarn is cut out from the yarn.

At present, in both spinning machines and winding machines, it is possible to use a yarn storage correspondingly, which is arranged between the spinning mechanism or the yarn feeding tube and the winding device. Corresponding yarn stores are described, for example, in EP 2 684 827 A2.

The thread passes through the storage drum on its way to the winding device, wherein the thread is wound onto the storage drum in the region of a first end face of the storage drum and is drawn off again from the storage drum in the region of a second end face. By adjusting the amount of yarn present on the storage drum, fluctuations in the yarn tension can be compensated.

On this background, it has been disclosed to regulate the rotational speed of the storage drum and/or the rotational speed of the thread guides through which the thread is guided during the withdrawal of the thread from the storage by means of the electric motor. The storage drum and the thread guide can be set in a rotary motion about the longitudinal axis of the storage drum independently of each other by means of an electric motor. Alternatively, it is also possible to drive the storage drum only actively, while the second motor only applies a preferably regulated braking force to the yarn guides. The above-described embodiments are of course also applicable to the yarn storage according to the invention described below.

Disclosure of Invention

In view of the above, it is an object of the present invention to improve the prior art.

The solution of the invention to achieve the above object is to have a yarn storage and a spinning machine or a winder.

The yarn store according to the invention has a section by which the yarn store is rigidly connected to a bearing (e.g. a bearing mechanism of a station) of a spinning or winding machine. The sections serve in principle for attaching the yarn store in a positionally fixed manner to the respective work station of the spinning or winding machine.

In the yarn storage according to the invention, the section is a shaft section extending along its longitudinal axis, wherein the shaft section may be of one-piece or multi-piece construction.

The yarn storage device furthermore comprises a yarn storage drum for temporarily receiving the yarn, which is rotatably mounted relative to the shaft section and is preferably at least partially of cylindrical design. The invention further provides a yarn guide which is rotatably supported relative to the shaft segment in order to guide the yarn and apply a certain tension to the yarn during unwinding from the yarn storage drum. The longitudinal axis of the yarn storage preferably corresponds to the axis of rotation of the yarn storage drum.

The yarn storage device comprises a first electric motor for driving the yarn storage drum to perform rotary motion around the shaft section, wherein the first electric motor is provided with a first stator and a first rotor which interacts with the first stator and is connected with the yarn storage drum.

In addition, a second electric motor is operatively connected to the thread guide, wherein the second electric motor can be designed to actively set the thread guide in a rotational movement. Additionally or alternatively, the second motor may also be configured to exert a braking force on the yarn guide subjected to the torque exerted by the yarn drawn from the yarn store. In this way, the tension of the yarn between the yarn storage and the subsequent yarn following unit can be adjusted. The second motor comprises a second stator and a second rotor interacting with the second stator and connected to the yarn guides.

The invention proposes that the second stator and/or the second rotor is at least partially surrounded by a shaft section in a radial direction perpendicular to the longitudinal axis. The second stator and/or the second rotor are located at least partially within the shaft section in a longitudinal section parallel to the longitudinal axis of the yarn storage and are therefore surrounded at least partially to the outside by the shaft section. In this way the second stator and/or the second rotor is protected from contamination.

In particular, when both the second stator and the second rotor are at least partially, preferably completely, located within the shaft section (i.e. at least partially surrounded by the shaft section wall), impurities (e.g. dust or fluff) are prevented from entering between the second stator and the second rotor and adversely affecting the function of the second electric motor.

It is likewise an additional advantage that the shaft section has an outer diameter, the value of which varies between the first stator and the second stator, preferably in a stepped manner. Preferably, the value increases from a first end face of the yarn storage in the region of which the shaft section is connected to the bearing of the spinning or winding machine to a second end face in the region of which the yarn guide is arranged. Due to the widening of the outer diameter of the shaft section, a cavity, which is described in detail below, is created, in which cavity the second stator and/or the second rotor can be arranged. It is also expedient for the outer diameter of the shaft section to be smaller in the region of the first end face than in the region of the second electric motor. This allows the first stator and/or the first rotor to be arranged between the storage drum wall and the shaft section.

Preferably, the outer diameter of the shaft section in the region of the first motor has a value of 10% to 80%, preferably 30% to 60%, of its corresponding value in the region of the second motor.

Advantageously, the shaft section has a cavity, in particular an externally closed cavity, at least in the region of the second stator. The cavity may have at least partially a cylindrical shape with an axis of symmetry coaxial with the longitudinal axis of the yarn storage. Preferably, the second rotor and the second stator are both arranged at least partially within the cavity, wherein the second rotor starts from the longitudinal axis and is surrounded by the second stator, viewed in the radial direction, and wherein the second stator together with the second stator is surrounded by the shaft section in the radial direction. It is particularly advantageous if the shaft section, the second stator and the second rotor have a common axis of symmetry in the region of the cavity.

A particular advantage is that the second stator and/or the second rotor is arranged at least partially in the cavity. In particular, the second stator may be completely surrounded by the shaft section towards the outside, wherein the rotor may extend from the cavity to the outside of the shaft section to the yarn guides. The second rotor can be connected directly to the thread guide, in particular in a rotationally fixed manner. As a result of this, the rotation of the second rotor directly causes a rotational movement of the yarn guides about the longitudinal axis of the yarn storage. As an alternative, the second stator can also brake the rotation of the yarn guide about the longitudinal axis of the yarn storage, due to the tension exerted by the yarn on the yarn guide, simply by applying an electric current.

It is also very advantageous if the second stator is arranged at least partially on the inner wall of the shaft section delimiting the cavity and is rigidly connected to the shaft section. For example, it is conceivable for the shaft section to have a cylindrical inner surface at least in the region of the second stator, against which inner surface the outer surface of the second stator directly bears. The second stator may, for example, be bonded to the inner surface. Preferably, the outer surface of the second stator or its envelope surface is concentric with the inner wall of the shaft section.

It is also advantageous if the shaft section at least partially surrounds the second stator and/or the second rotor in the region of the cavity in an annular manner. The shaft section may have a cylindrical inner wall at least in said region. Preferably, the outer wall of the shaft section, which in particular can be adjacent to the inner surface of the storage drum, also has a cylindrical shape in said region. In this region, the distance between the outer surface of the shaft section in the region of the second motor and the inner wall of the storage drum in this region should preferably be less than 10mm, in particular less than 5mm. It is particularly advantageous if an annular gap, preferably a cylindrical gap, is present between the shaft section and the storage drum.

It is also advantageous if the storage drum has a first end face and a second end face, wherein the hollow space extends between the first end face and the second end face. Here, the second end face is located in the region of the thread guides, while the first end face is located on the side of the thread storage means facing away from the thread guides. Preferably, the shaft section has a cavity which extends continuously within the shaft section from the first end face to the second end face, preferably even beyond the second end face.

The yarn store preferably has a cavity which is at least partially, preferably completely, delimited by the corresponding section of the shaft section. The cavity can be formed in a continuous cylindrical shape. Preferably, however, the cavity has a plurality of adjoining cavity sections, the inner diameter of which varies in the direction of the longitudinal axis. It is particularly advantageous if the diameter increases from the first end face in the direction of the second end face one or more times, wherein the increase is preferably carried out in a stepped manner. It is also conceivable to reduce the inner diameter in said direction at one or more locations.

Furthermore, it is advantageous if at least one rotational speed sensor for monitoring the rotational speed of the first rotor and/or the second rotor is arranged in the cavity. The rotational speed sensor can be designed, for example, as a hall sensor. Of course, other types of sensors are also conceivable, by means of which the rotational speed of the respective rotor can be monitored. In particular, the sensor should be able to be connected to the controller of the yarn store and/or to the controller of the spinning or winding machine. For this purpose, the yarn store can, for example, have one or more electric and/or data lines which are connected on one side to the respective speed sensor and on the other side or can be connected to a corresponding controller.

It is also advantageous if the first stator and/or the second stator is connected to at least one electrical line and/or data line, wherein the electrical line extends at least partially in the cavity. By means of the one or more lines, a magnetic field can be generated in the respective stator, which magnetic field causes a rotational movement of the respective rotor or exerts a braking force thereon. It is particularly advantageous that the current intensity at the respective stator can be adjusted individually, so that the driving or braking forces of the two electric motors can be adjusted individually.

It is further advantageous for the electrical and/or data lines to extend from the rotational speed sensor or the respective stator through the shaft section to the outside of the yarn storage device. Thereby guiding the respective wire inside the shaft section and thus protecting it from damage.

It is also an additional advantage that the yarn storage drum is rotatably mounted relative to the shaft section via a first bearing mechanism, wherein the first bearing mechanism is at least partially rigidly connected to the outer surface of the shaft section. As the bearing mechanism, for example, a ball bearing or a roller bearing is used. It is particularly advantageous if the respective bearing is bonded to the shaft section or connected to it by a press fit. Advantageously, the first bearing means comprises two respective bearings, wherein one bearing can be arranged in the region of the first end face of the storage drum and the second bearing is arranged in the region of the second end face.

An additional special advantage is that the second rotor is mounted rotatably relative to the shaft section via a second bearing mechanism, wherein the second bearing mechanism is at least partially surrounded by the shaft section in the radial direction. Correspondingly known ball bearings or roller bearings can also be used here. Advantageously, the second rotor is rotatably supported relative to the shaft section via two separate bearings spaced in the longitudinal direction of the yarn storage. One or more of the bearings may be bonded to the inner wall of the shaft segment or connected to the inner wall of the shaft segment by a press fit, for example.

Likewise, independently of the foregoing, it is generally conceivable for one or more further elements to be present in the cavity of the shaft section for guiding or mounting the second rotor. For example, it is conceivable for the carrier element to be arranged in the cavity and to be rigidly connected to the shaft section, wherein the bearing element has one or more of the bearings of the second rotor. It is also conceivable that the rotation rate sensor is attached to the carrier element, for example glued to the carrier element.

It is furthermore advantageous if the first stator and/or the first rotor is arranged at least partially between the shaft section and the inner wall of the storage drum. The first stator and/or the first rotor responsible for driving the storage drum is/are located outside the shaft section, in particular outside the above-mentioned cavity. Preferably, the first stator is attached to the outer surface of the shaft segment in a rotationally fixed manner. For example, the first stator may be adhered or attached to the outer surface by press fitting. The first rotor is preferably of annular configuration and preferably surrounds the first stator in said radial direction. Preferably, the first rotor, the first stator and the storage drum have a common axis of symmetry.

A particular advantage is that the shaft section has a projection arranged in the region of the thread guide, wherein the second rotor extends past the projection as far as the thread guide. The projection may be a segment of the shaft segment. It is also contemplated that the projections and shaft segments are interconnected discrete components. In particular, the projection should surround the second rotor in the form of a ring, in order to be protected from external influences and deposits of dirt by the projection. In a particularly advantageous embodiment, the projection forms the end face end of the shaft section in the region of the thread guide and has a through-opening concentric with the axis of rotation of the storage drum, through which the second rotor extends outside the cavity. The projection preferably has an outer diameter which is smaller than the outer diameter of the shaft section in the region of the second electric motor.

It is also advantageous if the storage drum has a longitudinal extent extending in the direction of the longitudinal axis of the storage device, wherein the shaft section extends at least over the entire longitudinal extent and is at least partially surrounded by the storage drum to the outside. In particular, the shaft section extends from the thread guide through the interior of the storage drum and through the storage drum in the region of the end face of the storage drum facing away from the thread guide. In this region, the shaft segments project from the storage drum so that the storage drum can be attached to a corresponding socket of a spinning or winding machine via the shaft segments.

It is furthermore advantageous if both the first rotor and the second rotor are formed by or comprise permanent magnets. It is also advantageous if the first stator and the second stator are present as electrical coils, so that the power of the two electric motors can be varied by varying the current strength at the respective coils.

Finally, the invention relates to a spinning or winding machine, characterized by at least one yarn storage according to the invention.

Drawings

Further advantages of the invention are described below in connection with the examples. In the figure:

fig. 1 schematically shows selected sections of an air jet spinning machine; and

fig. 2 shows schematically a longitudinal section through a yarn storage according to the invention.

Detailed Description

Fig. 1 shows a detail of an air jet spinning machine as an example of a textile machine, in which a yarn storage device 1 according to the invention can be used.

The air jet spinning machine comprises a drawing frame known from the prior art, of which only the feed roller pair 26 is shown. The tow band 28 fed to the various stations of the air-jet spinning machine is drawn by means of a drawing device. The tow band thus treated is then fed to an air spinning nozzle 27, also known in the art, by means of which air spinning nozzle 27 the yarn 6 is spun from the tow band.

The thread 6 is drawn off from the air spinning nozzle 27 by means of a drawing unit 25, preferably a drawing roller pair, and finally the thread 6 passes through one or more thread deflection means 24 into the region of the thread store 1. Depending on the orientation of the yarn store 1, the yarn deflection device 24 may not be provided.

As can be seen from fig. 1, by rotating the storage drum 5 of the storage unit 1, the thread 6 is wound onto the storage drum 5 in the region of the first end face 15 and is pulled out of the storage drum 5 again in the region of the second end face 16. In the region of the second end face 16, a thread guide 7 is present, through which thread guide 7 the thread 6 is guided and by means of which thread guide 7 a certain tension is applied to the drawn-off thread 6. In order to maintain the tension of the yarn, the yarn guide 7 is connected to a second electric motor, described in detail below, which can cause an active rotation of the yarn guide 7 or exert a braking force on the yarn guide 7.

Subsequently, the yarn 6 is fed to a winder (not shown in the figures) and wound onto a reel in a transverse movement there.

The storage unit 1 is basically used for temporarily buffering yarn sections, wherein the length of the yarn sections on the storage drum 5 is influenced by the rotational speed of the storage drum 5 and the motor power of the second motor connected to the yarn guide 7. For this purpose, the yarn store 1 is connected to a control (not shown in the figures).

The detail of the yarn storage 1 according to the invention can be seen in fig. 2, fig. 2 showing a longitudinal section along the longitudinal axis 3 of the yarn storage 1.

As shown in the figure, the yarn storage 1 comprises a shaft section 4 which extends in principle in the longitudinal direction of the yarn storage 1 and over the entire longitudinal extent L of the yarn storage drum 5 and is connected in a rotationally fixed manner to the bearing block 2 of the workstation of the air jet spinning machine.

The storage drum 5 is mounted on the shaft section 4 by means of a first bearing mechanism 18 in a rotatable manner about the longitudinal axis 3. For the active drive of the storage drum 5, i.e. for the rotation of the storage drum 5 about the longitudinal axis 3, the storage unit 1 has a first electric motor comprising a first stator 8 rigidly connected to the shaft section 4 and a first rotor 9 connected in a rotationally fixed manner to the storage drum 5. Preferably, the first rotor 9 bears directly against the inner wall 12 of the storage drum 5 and is glued or connected thereto by press fit, for example. The first rotor 9 can be directly placed against the outer surface 19 of the shaft section and also glued or pressed to it.

In addition, there is a second electric motor including a second stator 10 and a second rotor 11. When the second rotor 11 is rotatably supported relative to the shaft segment 4 via the second bearing mechanism 20, the second stator 10 is supported in a rotationally fixed manner. Preferably, the second stator 10 is directly connected, e.g. glued, to the inner wall 14 of the shaft section 4.

According to the invention, the second stator 10 and/or the second rotor 11 is at least partially surrounded by the shaft section 4 in the radial direction R shown. Particularly advantageously, the shaft section 4 has a cavity 13, in which cavity 13 the second rotor 11 and/or the second stator 10 is arranged. The cavity 13 preferably extends through the entire shaft section 4 in order to be able to guide electrical and/or data lines 23 connected to one or both stators 8, 10 through the shaft section 4 to the outside. For the sake of clarity, in the example shown only a single electric and/or data line 23 is shown, which is connected to the second stator 10 and leads to the outside of the yarn storage 1. It goes without saying that each stator 8, 10 can be connected to its own electrical and/or data line 23.

Preferably, the outer diameter a of the shaft section widens from the first end face 15 of the storage drum 5 in the direction of the second end face 16, wherein the necessary cavity 13 is created by the widening of the outer diameter a.

In addition to this, the first rotor 9 and/or the second rotor 11 are configured as permanent magnets or comprise one or more permanent magnets.

Finally, fig. 2 shows that a rotational speed sensor 17, by means of which the rotational speed of the second rotor can be monitored, can also be present in the cavity 13. In addition or as an alternative, a rotational speed sensor 17 for monitoring the rotational speed of the first rotor 9 may of course also be present. The respective rotational speed sensor 17 is preferably also connected to an electrical and/or data line 23 for operation, which is not shown in fig. 2.

Finally, fig. 2 shows that the shaft section 4 preferably has a projection 21 in the region of the second end face 16 of the storage drum 5, which projection 21 projects outwards from the storage drum 5. It is effective in this connection that the second bearing mechanism 20 is arranged between the shaft section 4 and the second rotor 11 in the region of the projection 21.

The invention is not limited to the embodiments shown in the drawings and described herein. Even if features are illustrated and described in different parts of the description or the claims or in different embodiments, any combination of these features may fall as a variant within the scope of the claims, without departing from the teaching of the independent claims.

List of reference numerals

1. Yarn storage device

2. Bearing seat

3. Longitudinal axis of yarn storage device

4. Shaft section

5. Yarn storage drum

6. Yarn

7. Yarn guide

8. First stator

9. First rotor

10. Second stator

11. Second rotor

12. Inner wall of yarn storage drum

13. Hollow space of shaft section

14. Inner wall of the shaft section

15. First end face of yarn storage drum

16. Second end surface of yarn storage drum

17. Rotating speed sensor

18. First bearing mechanism

19. Outer surface of the shaft section

20. Second bearing mechanism

21. Projection of a shaft section

22. Permanent magnet

23. Electrical and/or data line

24. Yarn deflection mechanism

25. Pulling unit

26. Feed roller pair

27. Air spinning nozzle

28. Fiber binding belt

Longitudinal extension of L-shaped yarn storage drum

R radial direction

Outer diameter of A shaft section

Claims

1. A yarn storage (1) for a spinning or winding machine,

wherein the yarn storage (1) has a shaft section (4), the shaft section (4) can be rigidly connected with a bearing seat (2) of a spinning machine or a winding machine and extends in the direction of a longitudinal axis (3) of the yarn storage (1),

wherein the yarn storage (1) has a yarn storage drum (5) for temporarily receiving a yarn (6), the yarn storage drum (5) being rotatably mounted relative to the shaft section (4),

wherein the yarn storage (1) has a yarn guide (7) for guiding the yarn (6), wherein the yarn guide (7) is rotatably supported relative to the shaft section (4),

wherein the yarn storage (1) has a first motor for driving the yarn storage drum (5), the first motor has a first stator (8) and a first rotor (9) interacting with the first stator (8) and connected with the yarn storage drum (5), and

wherein the yarn storage (1) has a second electric motor operatively connected to the yarn guides (7), the second electric motor having a second stator (10) and a second rotor (11) interacting with the second stator (10) and connected to the yarn guides (7),

it is characterized in that the preparation method is characterized in that,

the second stator (10) and/or the second rotor (11) is at least partially surrounded by the shaft section (4) in a radial direction (R) perpendicular to the longitudinal axis (3).

2. Yarn storage (1) according to claim 1, characterized in that the shaft section (4) has an outer diameter (a) whose value varies along the longitudinal axis (3) between the first stator (8) and the second stator (10).

3. Yarn storage (1) according to claim 2, characterized in that the value of the outer diameter (a) changes in a stepwise manner along the longitudinal axis (3) between the first stator (8) and the second stator (10).

4. Yarn storage (1) according to claim 1, characterized in that the shaft section (4) has a cavity (13) at least in the region of the second stator (10).

5. Yarn storage (1) according to claim 4, characterized in that the shaft section (4) has a cavity (13) which is closed to the outside at least in the region of the second stator (10).

6. Yarn storage (1) according to claim 4, characterized in that the second stator (10) and/or the second rotor (11) is arranged at least partially within the cavity (13).

7. Yarn storage (1) according to claim 4, characterized in that the second stator (10) is rigidly connected to the shaft section (4) at least partially at an inner wall (14) of the shaft section defining the cavity (13).

8. Yarn storage (1) according to one of claims 4 to 7, characterized in that the shaft section (4) at least partially surrounds the second stator (10) and/or the second rotor (11) in the region of the cavity (13) in an annular shape.

9. Yarn storage (1) according to any one of claims 4 to 7, characterized in that the storage drum (5) has a first end face (15) and a second end face (16), wherein the cavity (13) extends between the first end face (15) and the second end face (16).

10. Yarn storage (1) according to one of the claims 4 to 7, characterized in that at least one rotational speed sensor (17) for monitoring the rotational speed of the first rotor (9) and/or the second rotor (11) is arranged in the cavity (13).

11. Yarn storage (1) according to one of the claims 4 to 7, characterized in that the first stator (8) and/or the second stator (10) is connected with at least one electric and/or data line (23), wherein the electric and/or data line (23) extends at least partially within the cavity (13).

12. Yarn storage (1) according to claim 1, characterized in that the storage drum (5) is rotatably supported relative to the shaft section (4) via a first bearing means (18), wherein the first bearing means (18) is at least partially rigidly connected with an outer surface (19) of the shaft section.

13. Yarn storage (1) according to claim 1, characterized in that the second rotor (11) is rotatably supported relative to the shaft section (4) via a second bearing means (20), wherein the second bearing means (20) is at least partially surrounded by the shaft section (4) in the radial direction (R).

14. Yarn storage (1) according to claim 1, characterized in that the first stator (8) and/or the first rotor (9) is arranged at least partially between the shaft section (4) and an inner wall (12) of the storage drum (5).

15. Yarn storage (1) according to claim 1, characterized in that the shaft section (4) has a projection (21) arranged in the region of the yarn guide (7), wherein the second rotor (11) extends over the projection (21) as far as the yarn guide (7).

16. Yarn storage (1) according to claim 1, characterized in that the yarn storage drum (5) has a longitudinal stretch (L) running in the direction of the longitudinal axis (3) of the yarn storage (1), wherein the shaft section (4) extends at least over the entire longitudinal stretch (L) and is surrounded at least partially outwards by the yarn storage drum (5).

17. Yarn storage (1) according to claim 1, characterized in that the first rotor (9) and the second rotor (11) are both constituted by permanent magnets (22) or comprise permanent magnets (22).

18. Spinning or winding machine, characterized in that it comprises one or more yarn storages (1) according to any of the previous claims.