Yarn storage unit for textile machine work unit

Abstract

To provide a yarn storage unit that particularly reliably allows a yarn tension during a winding process to be maintained sufficiently constant.SOLUTION: A yarn storage unit 1 for a spinning unit and / or a winding unit comprises a yarn guide arm 2 and a controllable drive unit 4 for turning the yarn guide arm reversibly. In order to maintain a constant yarn tension during the winding process, the yarn guide arm has a first coupling element 6 that is supported freely and pivotably and spaced from a pivot line, the drive unit has a magnetic second coupling element that acts on the first coupling element in a magnetically repulsive manner that is positioned laterally to the first coupling element or movably around the pivot line, the second coupling element is positioned in the drive unit so as to act on and be couplable to the first coupling element, and the movement of the second coupling element in the direction toward the first coupling element is specified to cause the movement of the first coupling element in the same direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a yarn storage unit for a working unit of a textile machine, particularly for a spinning unit and / or a winding unit, comprising: - a yarn guide arm that is pivotably supported about a pivot axis, and - a controllable drive unit for reversibly pivoting the yarn guide arm. The present invention relates to a yarn storage unit.

[0002] In connection with working units of textile machines, such as spinning and winding machines, particularly spinning units and / or winding units, a controllable yarn storage unit is known to be arranged upstream of a creel device along a yarn path in order to wind packages, such as conical cross-wound packages. This yarn storage unit serves to adapt the yarn slack that occurs during the winding of the package to a constant yarn supply speed, for example of a spinning device or a spinning bobbin withdrawal device. In known textile machines, the winding package is usually held during the winding process or during the winding operation on a pivotably supported package frame of a winding device arranged downstream of the creel device and is usually driven by friction by a friction roller or individually. Specifically, the winding speed of the winding package is related to the respective winding diameter of the winding package and corresponds, for example, to a constant yarn supply speed by means of the winding device. The yarn is wound in a cross-wound manner, particularly in a crossed manner, by the creel device, defined by the package width during winding. At this time, based on a constant yarn supply speed, the yarn periodically relaxes, and therefore, in order to maintain the desired yarn tension, it is necessary to compensate for the slack during the shortening of the working path of the yarn along the yarn path.

[0003] In addition to compensating for yarn slack, it is also essential to maintain a sufficiently constant yarn tension during the winding process. Based on prior art, such as in European Patent Application Publication No. 2955142, it is already known to configure a yarn storage unit with a yarn guide arm, which can be swiveled within the range of the yarn path, thereby forming a loop and temporarily extending the length of the yarn's normal working path. The yarn guide arm is typically supported and positionable via a controllable electric drive, rotatably in the direction laterally to the yarn path about a pivot axis. The electric drive is controlled via a control system, which obtains output information for controlling a yarn tension sensor. In relation to the yarn tension present during winding, the control system responds in a prescribed form of control over the electric drive and thus the yarn guide arm, thereby increasing or decreasing the yarn tension.

[0004] However, known systems have the drawback that they are not suitable for maintaining a sufficiently constant thread tension, especially at relatively high winding speeds and particularly when the thread tension changes frequently due to various factors.

[0005] Starting from this, the fundamental problem of the present invention is to provide a yarn storage unit that makes it particularly reliable to maintain a sufficiently constant yarn tension during the winding process.

[0006] The present invention solves this problem with a yarn storage unit having the features of claim 1, a work unit comprising such a yarn storage unit as having the features of claim 8, and a method for adjusting yarn tension in such a work unit as having the features of claim 12. Advantageous improved forms of the present invention are described in the dependent claims.

[0007] A feature of the yarn storage unit according to the present invention is that the yarn guide arm is supported so as to be freely rotatable and has a magnetically acting first coupling element positioned at a distance from the pivot axis. Furthermore, the drive unit has a magnetic second coupling element that is movably positioned relative to the first coupling element and acts on the first coupling element in a magnetically repulsive manner. This magnetic second coupling element is positioned in the drive unit so as to be actuated to the first coupling element, and the movement of the second coupling element toward the first coupling element causes the first coupling element to move in the same direction and, consequently, the rotation of the yarn guide arm.

[0008] Unlike known yarn storage units in which the yarn guide arm is directly forced to rotate by the drive shaft of the drive unit, for example via a fixed support, and as a result force transmission is strictly carried out by components that are in contact with each other along the force transmission path, the yarn guide arm according to the present invention is supported in a way that allows it to rotate freely, particularly on the drive shaft of the drive unit. This allows the rotational force generated by the drive shaft to be transmitted to the yarn guide arm non-contact using magnetic means. According to the present invention, the first coupling element and the second coupling element are aligned with each other such that both coupling elements exert a magnetic effect that repels each other. Therefore, as a result, when the second coupling element is moved by the drive unit toward the first coupling element, a movement of the first coupling element occurs corresponding to the direction of motion of the second coupling element, based on the repulsive effect between the first and second coupling elements, and as a result the yarn guide arm is rotated about a pivot axis, based on the fact that the first coupling element is coupled to the yarn guide arm. As a result, the movement of the thread guide arm around the pivot axis is performed non-contact via the drive unit, in relation to the adjusted position of a second connecting element located in the drive unit.

[0009] The rotation of the yarn guide arm around its pivot axis within the yarn path causes the yarn to loop within the area of ​​the yarn storage unit. The yarn guide arm can preferably engage with the yarn in the area between two yarn guide rollers or yarn guide holes arranged along the yarn path, thereby creating a predetermined loop. Non-contact movement of the yarn guide arm by the drive unit occurs via both connecting elements. During the winding process, if excess yarn is generated that reduces the yarn tension, this excess yarn is preferably contained as a loop between the yarn guide rollers or yarn guide holes and the yarn guide arm. Conversely, during the winding process, if there is less yarn than required by the winding package, such as a twill winding package, and this increases the yarn tension, the required length of yarn is released from the loop by the return movement of the yarn guide arm. To this end, the second connecting element is moved via the drive unit so that the yarn guide arm is rotated in the opposite direction, pushing the yarn away. At this time, the return rotation of the thread guide arm occurs based on the thread tension acting on the thread guide arm. This causes the thread guide arm to follow the return adjustment movement of the second connecting element, releasing the required thread length as specified. As a result, the thread storage unit can maintain constant thread tension accurately and frequently via the freely rotatably supported thread guide arm, thereby enabling the winding process to be carried out at particularly high winding speeds and ensuring the manufacture of both cylindrical and conical winding packages with particular reliability.

[0010] Ideally, the movement of the yarn guide arm toward or toward the yarn is performed without changing the distance between the first and second connecting elements, and consequently without changing the magnetic elastic force resulting from the distance between the two connecting elements. The movement of the yarn guide arm can preferably be controlled via a control system that controls a drive unit and a sensor unit connectable to the control system for transmitting detected sensor information. The control system is preferably designed to process and evaluate the transmitted sensor information and control the drive unit as specified based on the evaluation results. The control system may preferably comprise a control unit and a data processing and evaluation unit. These units may be the same unit or different units from each other. Alternatively, two units, each comprising only one unit, may be implemented. The control system may further be a component of the yarn storage device or a component separate from the yarn storage unit. The arrangement of the control system may also be freely selected. Therefore, the control system may be located in a central machine control device in a work unit comprising a yarn storage unit, and / or located away from the textile machine. Redundant control may also be possible by providing two such control systems that inspect each other or are inspectable.

[0011] A sensor unit connectable to the control system can preferably be used to detect the rotational movement and / or position of the thread guide arm, thereby allowing the sensor information detected by the sensor unit to also determine the change in the gap between both connecting elements caused by changes in thread tension. When the thread guide arm has a position moved toward the second connecting element relative to the position adjusted by the control system, that is, when the gap between the first and second connecting elements is small, the magnetically generated elastic force acting between the first and second connecting elements increases. By considering known magnetic elastic force characteristic curves stored in advance in the control system or in a readable memory unit connected to the control system, the thread tensile force and thus the thread tension acting on the thread can be estimated via the control system. As a result, the thread tension can be checked, adjusted, and / or kept constant via the control system by the change in the position of the second connecting element relative to the first connecting element through appropriate control of the drive unit.

[0012] This allows the yarn storage unit to maintain a constant yarn tension, particularly accurately and at a high frequency.

[0013] The configuration in which the drive unit moves the second connecting element relative to the first connecting element can be basically carried out in any form. Here, for example, a linear drive device can be considered in which the second connecting element is moved laterally with respect to the pivot axis in a direction linearly toward the first connecting element, thereby causing the thread guide arm to move.

[0014] A particularly advantageous configuration of the present invention is characterized in that the second coupling element is positioned on a support that is particularly coaxially movable by a drive unit about the pivot axis of the thread guide arm. According to this configuration of the present invention, the second coupling element is movable about the pivot axis of the thread guide arm, and for this purpose, the second coupling element is positioned on a support coupled to a drive unit. The rotation of the support about the pivot axis of the thread guide arm allows for the use of a rotary drive device, which is particularly space-saving, for the movement of the second coupling element. Furthermore, the rotation of the second coupling element, which is particularly preferably positioned at the same distance from the pivot axis as the first coupling element, provides particularly uniform and reliable movement, thereby enabling particularly precise driving of the thread guide arm by the movement of the support by a control system.

[0015] The arrangement of the first connecting element in the thread guide arm is basically freely selectable. In a particularly preferred configuration of the present invention, the first connecting element is detachably fixed to the thread guide arm, and / or the second connecting element is detachably fixed to the drive unit. This configuration of the present invention allows the first and / or second connecting elements to be easily replaced when necessary, thereby easily adapting to a variety of manufacturing conditions that may require different magnetic effects. Furthermore, maintenance and repair work can be performed particularly easily and quickly.

[0016] The configuration of the second connecting element, particularly the drive unit for moving the support, is basically freely selectable, and various motor drive devices can be used. However, according to a particularly advantageous configuration of the present invention, the drive unit is specified to have an electric motor with a drive shaft, particularly a stepper motor, the drive shaft is coupled to the support so as not to rotate relative to it, and the thread guide arm is supported on the drive shaft so as to be freely rotatable. Particularly preferably, the guide arm has a bearing unit, particularly a bushing element, at one free end, which allows the thread guide arm to be mounted on the free end of the drive shaft. The bearing unit is designed to support the thread guide arm so as to be freely rotatable on the free end of the drive shaft, without being affected by the rotational movement of the drive shaft, that is, without torque transmission. Even more preferably, the thread guide arm has a thread guide section, particularly a thread guide hole or thread guide roller, at the other free end for contacting and guiding the thread. This allows for maximum utilization of the lever action of the thread guide arm. Other optional locations for the bearing unit and thread guide section along the longitudinally extending axis of the thread guide arm can also be considered in accordance with other advantageous embodiments.

[0017] According to this configuration of the present invention, particularly precise movement of the support about the pivot axis of the thread guide arm is possible via a reversibly acting electric motor. Furthermore, the drive shaft works to mount the thread guide arm so that it can rotate freely. Here, freely rotatable support or free rotatability generally means a coupling between the drive shaft and the thread guide arm without torque transmission, so that the drive shaft works only to pivot the thread guide arm, particularly to support it so that no torque is transmitted to the thread guide arm. The corresponding configuration of the thread storage unit further enables a particularly compact configuration of the thread storage unit, and it is particularly guaranteed that the second coupling element positioned on the support can move about the drive shaft on the same circumference as the first coupling element positioned on the thread guide arm at a corresponding distance from the axis of the drive shaft.

[0018] The configuration in which the first and second connecting elements repel each other magnetically is basically freely selectable. For example, the first and / or second connecting elements may be formed as electromagnets, and the magnetic fields of the electromagnets are aligned to cause both connecting elements to repel each other. The electromagnets may be controllable via a control system, thereby allowing different magnetic fields to be generated via the electromagnets as needed, and consequently, the repulsive force to be adjusted, in particular, controlled, via the appropriate control system.

[0019] According to a particularly advantageous configuration of the present invention, the first and second connecting elements are specified to be formed as permanent magnets. Using permanent magnets as connecting elements that are appropriately aligned and positioned between the thread guide arm and the support is a particularly simple, easy-to-maintain, and inexpensive possibility for providing magnetic repulsion. The desired repulsion can be determined by the selection of permanent magnets.

[0020] The coupling of the support to a drive unit, particularly a drive shaft of an electric motor, can be achieved by a simple flange coupling. However, according to an improved embodiment of the present invention, the support is positioned on a connecting disc that is coaxial with the drive shaft and coupled to the drive shaft so as not to rotate relative to it. The use of the connecting disc ensures particularly reliable movement of the support and a second connecting element coupled to the support about the pivot axis of the thread guide arm. The connecting disc may be in contact with a correspondingly opposing surface of an electric motor, which is advantageously positioned for surface-to-surface guidance.

[0021] A sensor unit operates to detect the rotational movement and / or position of the thread guide arm, particularly to recognize deviations of the thread guide arm's position from a position adjusted via a drive unit by a control system, and this sensor unit may be positioned at virtually any location. According to a preferred configuration of the present invention, the sensor unit is configured and positioned to detect the rotation angle and / or position of a connecting element, which is non-rotatably coupled to the thread guide arm and positioned coaxially with respect to the drive shaft. In this case, the sensor unit is more preferably positioned coaxially with respect to the connecting element. According to this configuration of the present invention, the connecting element, which is non-rotatably coupled to the thread guide arm, partially extends into a sensor unit positioned at a distance from the end of the drive shaft. The corresponding arrangement of the sensor unit, particularly preferably coaxial with respect to the connecting element, enables particularly accurate detection of the rotational movement and / or position of the thread guide arm and further enables a particularly compact configuration of the thread storage unit.

[0022] In another aspect of the present invention, a working unit for a textile machine, particularly a spinning unit or a winding unit, is proposed, which includes a yarn storage unit according to the embodiments described above. The working unit further comprises a yarn supply device for supplying yarn, a spinning device for spinning the supplied yarn, and a yarn winding device for winding the spinned yarn into a winding package. The yarn supply device, the spinning device, and the yarn winding device are arranged along a yarn path to process the yarn accordingly. The yarn path is a path from a supply point to a winding point, and the yarn extends along this path during the winding process, where it is not affected by the yarn storage unit. The yarn storage unit is also positioned along the yarn path between the yarn supply device and the spinning device, thereby pushing the running yarn away from the yarn path during the winding process by the rotational movement of a yarn guide arm. Particularly preferably, the yarn guide arm is positioned along the yarn path between two yarn guide rollers or yarn guide holes, and the yarn is guided during the winding process via both guide rollers or through both yarn guide holes. The yarn guide roller or yarn guide hole may be supported by a waxing device positioned upstream of the slewing device along the yarn path, and may be positioned upstream of the waxing body of the waxing device. This allows for the possible placement of the yarn storage unit near the slewing device, and in this case, the lateral reciprocating motion of the yarn, which is oriented laterally to the yarn path and generated by the slewing device, can uniformly consume the waxing body over its width extending laterally to the yarn path, thereby uniformly waxing the yarn.

[0023] In a preferred embodiment, the work unit is assigned the control system described above and the sensor unit described above, which is connectable to the control system for information exchange, wherein the sensor unit is configured and positioned to detect the rotational movement and / or position of the thread guide arm and to transmit sensor information to the control system. Preferably, the control system is designed to process and evaluate the transmitted sensor information and to control the drive unit as specified based on the evaluation results. More preferably, the control system is configured not only to control the drive unit to adjust the thread tension and / or storage amount of the guided thread, but even more preferably to control the sensor unit to retrieve sensor information.

[0024] In a preferred embodiment, the resting position of the yarn guide arm is located across the yarn path, where the yarn guided by the yarn guide arm is pushed away from the yarn path during the winding process. In other words, the yarn guide arm of the yarn storage unit is positioned along the yarn path such that the resting position of the yarn guide arm, corresponding to the zero position of the drive unit, is located outside the range of the yarn path and in a direction in which the yarn guide arm pushes the yarn away from the yarn path. This ensures that the yarn guide arm can return to its original position when displaced from the yarn path, solely by the force acting on the yarn in the direction of the yarn path. Alternatively or additionally, the yarn storage unit may have another connecting element that acts magnetically or mechanically to exert an elastic force, such a connecting element being opposite to the magnetic force acting of the first and second connecting elements, and designed to return the yarn guide arm in the opposite direction to the displacement direction of the first and second connecting elements, as necessary. These additional connecting elements may preferably be connected to a drive unit, a connection system connected to the drive unit, and a sensor unit or another sensor unit, as with the first and second connecting elements, as in the control system described above, thereby allowing the thread guide arm to rotate as required.

[0025] According to another aspect of the present invention, a method for adjusting the yarn tension of a yarn running in a working unit according to one of the above-described embodiments is proposed. The sensor unit transmits sensor information regarding the rotational movement and / or position of the yarn guide arm to a control system assigned to the working unit. Based on the transmitted sensor information, the control system evaluates the magnetic force acting between the first connecting element and the second connecting element in order to identify the yarn tension applied to the yarn, and if a deviation from a limit value or a range of limit values for the yarn tension is evaluated as unacceptable, the drive unit is controlled as described above in a prescribed manner to change the position of the yarn guide arm. Thereby, as described at the beginning, the yarn tension can be kept constant during the winding process and can be adjusted as necessary.

[0026] Next, an example of the present invention will be described while referring to the drawings.

Brief Description of the Drawings

[0027] [Figure 1] It is a perspective view schematically showing a yarn storage unit according to one example. [Figure 2] It is a perspective view schematically showing an enlarged partial area of the yarn storage unit shown in FIG. 1. [Figure 3] It is a perspective view schematically showing the yarn storage unit shown in FIG. 1 in an enlarged manner with the yarn guide arm omitted. [Figure 4] It is a perspective view schematically showing the yarn guide arm of the yarn storage unit shown in FIG. 1. [Figure 5] It is a perspective view schematically showing the yarn storage unit shown in FIG. 1 in an arrangement form arranged upstream of the waxing device.

[0028] Figure 1 shows a schematic perspective view of a yarn storage unit 1 according to one embodiment. This yarn storage unit 1 is connected to a connecting plate 17 for placement in a working unit of a textile machine (not shown here), particularly a spinning unit or a winding unit. Figures 2 to 4 show a schematic perspective view of an enlarged portion of the yarn storage unit 1 shown in Figure 1, and the yarn guide arm 2 of this yarn storage unit 1 is shown in a schematic perspective view.

[0029] The yarn storage unit 1 has a yarn guide arm 2, and a yarn guide hole 13 located at the free end of this yarn guide arm 2 is positioned in the yarn path F of the yarn to be wound onto the winding package in the working unit. The yarn is guided through the yarn guide hole 13. To form the yarn storage device, the yarn guide arm 2 is pivotably supported on the drive shaft 16 of the electric motor 5 of the drive unit 4 of the yarn storage unit 1. For this purpose, the yarn guide arm 2 has a bushing 18 positioned at the free end of the drive shaft 16, thereby supporting the yarn guide arm 2 on the drive shaft 16 without torque transmission. The bushing 18 is further coupled to a holder 9 coupled to the yarn guide arm 2, which has an opening for housing a first connecting element 6 formed as a permanent magnet.

[0030] For the loop-forming rotation of the thread guide arm 2 during operation, the drive shaft 16 of the electric motor 5 is coupled non-rotatably to a connecting disk 14 that is coaxial with the drive shaft 16. A support 8 is positioned on the connecting disk 14, and this support 8 has another bush 12 for housing another permanent magnet as a second connecting element 7. The permanent magnet in the thread guide arm 2 and the permanent magnet in the support 8 are aligned with each other so that both magnets exert a magnetic effect that repels each other. As a result, the rotation of the connecting disk 14 by the reversibly operating electric motor 5 causes the thread guide arm 2 to rotate proportionally and non-contact around the drive shaft 16 that defines the pivot axis S. The electric motor 5 is controlled via a connection 19 by a control system (not shown herein).

[0031] For position recognition of the thread guide arm 2, a sensor unit 3 located on the housing cover 11 of the housing 10 above the drive shaft 16 (as shown in the drawing) is useful. The sensor in this sensor unit 3 that recognizes the rotation angle is coaxially positioned with respect to the connecting element 15 coupled to the thread guide arm 2, and the sensor unit 3 itself extends in the longitudinal direction of the drive shaft 16.

[0032] Through the sensor unit 3, at least the rotational movement or position of the thread guide arm 2 can be particularly reliably defined, and by transmitting the corresponding sensor information to the control system, the deviation of the thread guide arm 2 from the position adjusted by the drive unit 4 can be confirmed via the control system. For example, when the thread tension increases, this causes the thread guide arm 2 to move toward the second connecting element 7 against the elastic force generated by the magnetic repulsion. Starting from this point, the control system can move the connecting disk 14 in the reverse direction. For example, when the thread tension decreases during the occurrence of thread slack, this causes the second connecting element 7 to move toward the thread guide arm 2 together with the connecting disk 14 and the permanent magnet by the rotation of the drive shaft 16 and the support 8 connected thereto. Due to the magnetic repulsion, the thread guide arm 2 is also moved in the same direction, thereby pushing the guided thread away from its thread path or further away from its thread path, forming or increasing the thread loop. In this way, a substantially constant thread tension can be obtained and guaranteed throughout the entire winding process or winding process.

[0033] Figure 5 shows a schematic perspective view of one embodiment of the arrangement of the yarn storage unit 1 in a work unit (not shown), where the work unit may be a spinning unit or a winding unit. The yarn storage unit 1 is positioned upstream of a waxing device 20 (only schematically partially shown) located upstream of the spinning device along the yarn path F, which extends from a yarn supply device (not shown) toward a spinning device (not shown). The waxing device 20 has a holder 22 on its lower side, which rotatably holds two yarn guide rollers 21. Through both yarn guide rollers 21, the yarn can be partially wound and guided along the yarn path. The yarn storage unit 1 is positioned in the yarn path F such that the guide holes 13 of the yarn guide arms 2 can pivot within the yarn path F. This allows the running yarn to be pushed laterally from the yarn path F with respect to the direction of arrangement of the yarn guide rollers 21. The yarn comes into contact with the yarn guide roller 21 based on outward pushing from its yarn path F by the yarn storage unit 1, thereby forming a yarn loop of a specified size between the yarn guide roller 21. The size of the yarn loop is changed as required by the yarn storage unit 1 via a control system that controls the electric motor 5 and, consequently, the yarn guide arm 2, in accordance with the detected rotational movement or position of the yarn guide arm 2, thereby adjusting and controlling the yarn tension that should be kept constant for the winding process. [Explanation of Symbols]

[0034] 1. Thread storage unit 2 thread guide arm 3 Sensor Unit 4 Drive Unit 5 Electric motor 6. First connecting element 7. Second connecting element 8 Support 9 holders 10 Housing 11 Housing Cover 12 Another bush 13 thread guide holes 14 Linked Discs 15 connection elements 16 drive shafts 17 Connection Plate 18 Bush 19 Connection part 20 Waxing device 21 Thread guide roller 22 Holding body F Itoso Road S Swivel axis

Claims

1. A yarn storage unit (1) for a working unit of a textile machine, - a yarn guide arm (2) rotatably supported about a pivot axis (S), - a controllable drive unit (4) for reversibly rotating the yarn guide arm (2), In the yarn storage unit (1) comprising: - the yarn guide arm (2) is freely rotatably supported and has a first connecting element (6) acting magnetically, which is arranged at a distance from the pivot axis (S), - the drive unit has a magnetic second connecting element (7) which is movably arranged relative to the first connecting element (6) and acts on the first connecting element (6) so as to repel magnetically, the second connecting element (7) being arranged in the drive unit (4) so as to be operatively connectable to the first connecting element (6), and movement of the second connecting element (7) in the direction towards the first connecting element (6) causing movement of the first connecting element (6) in the same direction, Characterized in that it is a yarn storage unit (1).

2. The yarn storage unit (1) according to claim 1, characterized in that the second connecting element (7) is arranged on a support (8) which is coaxially movable about the pivot axis (S) of the yarn guide arm (2) by the drive unit (4).

3. The yarn storage unit (1) according to claim 1 or 2, characterized in that the first connecting element (6) is detachably fixed to the yarn guide arm (2).

4. The yarn storage unit (1) according to claim 1 or 2, characterized in that the drive unit (4) has an electric motor (5) with a drive shaft (16), the drive shaft (16) being non-rotatably coupled to the support (8), and the yarn guide arm (2) being freely rotatably supported on the drive shaft (16).

5. The yarn storage unit (1) according to claim 1 or 2, characterized in that the first connecting element (6) and the second connecting element (7) are formed as permanent magnets.

6. The yarn storage unit (1) according to claim 1 or 2, characterized in that the support (8) is arranged on a connecting disk (14) which is arranged coaxially with respect to the drive shaft (16) and is non-rotatably connected to the drive shaft (16).

7. A sensor unit (3) is assigned to the yarn storage unit (1), and the sensor unit (3) is configured and arranged to detect the rotational movement and / or position of a connecting element (15) which is non-rotatably connected to the yarn guide arm (2), in particular arranged coaxially with respect to the drive shaft (16). The yarn storage unit (1) according to claim 1 or 2.

8. A working unit of a fiber machine, a yarn supply device for supplying yarn, a shedding device for shedding the supplied yarn, a yarn winding device for winding the shed yarn onto a winding package arranged along a yarn path, and in the working unit, comprises the yarn storage unit (1) according to claim 1 or 2, and the yarn storage unit (1) is arranged between the yarn supply device and the shedding device along the yarn path in order to push the yarn running along the yarn path away from the yarn path in a prescribed manner by the pivoting movement of the yarn guide arm (2). A working unit, characterized in that.

9. The rest position of the yarn guide arm (2) is provided at a position crossing the yarn path, and at this position, the yarn guided by the yarn guide arm (2) is pushed away from the yarn path during the winding process. The working unit according to claim 8, characterized in that.

10. The working unit is assigned a control system and a sensor unit (3) connectable to the control system for information exchange. The sensor unit (3) is configured and arranged to detect the rotational movement and / or position of the yarn guide arm (2) and transmit sensor information to the control system. The control system is designed to process and evaluate the transmitted sensor information and control the drive unit (4) as specified based on the evaluation result. The working unit according to claim 8, characterized in that.

11. The control system is configured to control the drive unit (4) to adjust the yarn tension and / or the storage amount of the guided yarn. The working unit according to claim 10, characterized in that.

12. A method for adjusting the yarn tension of a yarn running on the working unit according to claim 10, comprising: The sensor unit (3) transmits sensor information regarding the rotational movement and / or position of the yarn guide arm (2) to the control system assigned to the working unit. Based on the transmitted sensor information, the control system evaluates the magnetic force acting between the first connecting element (6) and the second connecting element (7) to identify the existing yarn tension. When a deviation from a limit value or a range of limit values for the yarn tension is evaluated as unacceptable, the drive unit (4) is controlled as specified to change the position of the yarn guide arm (2).

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