Workstation of a textile machine, yarn storage unit for a workstation of a textile machine, and method for adjusting the yarn tension of a moving yarn at a workstation

Abstract

The invention relates to a station of a textile machine, a yarn storage unit for a station of a textile machine, and a method for adjusting the yarn tension of a moving yarn at the station. The yarn storage unit is particularly for a spinning position and / or a winding position and has a yarn guide arm pivotally mounted about a pivot and a controllable drive unit for reversibly pivoting the yarn guide arm. It is provided in order to provide a yarn storage unit that particularly reliably allows the yarn tension to be maintained substantially constant during the winding process that the yarn guide arm is rotatably mounted freely and has a first engaging member with a magnetic action spaced from the pivot, and the drive unit has a second magnetic engaging member arranged adjustably relative to the first engaging member and exerting a magnetic repulsion on the first engaging member, and the second magnetic engaging member can be placed in effective connection with the first engaging member and arranged on the drive unit, wherein the adjustment of the second engaging member towards the first engaging member causes a co-directional displacement of the first engaging member.

Description

Field of the Invention

[0001] The present invention relates to a yarn storage unit for a station of a textile machine, in particular a spinning position and / or a winding position, having a yarn guide arm pivotally mounted about a pivot and a controllable drive unit for pivoting the yarn guide arm in the reverse direction. Background Art

[0002] It is known in connection with stations of textile machines such as spinning machines and winding machines, in particular spinning positions and / or winding positions, that in order to wind a bobbin, for example a conical cross-wound bobbin, a traversing device is provided upstream of a controllable yarn storage unit along the yarn travel path. This yarn storage unit serves to adapt the yarn sag occurring during bobbin winding to a constant yarn feed speed, for example of a spinning device or a pirn withdrawal device. In known textile machines, the winding bobbin is usually held during the winding process or the winding process in a pivotally mounted bobbin carrier of a winding device provided downstream of the traversing device and is usually driven by friction or individually by a friction roller. Specifically, the winding speed of the winding bobbin corresponds to a constant yarn feed speed achieved, for example, by means of a spinning device, depending on its winding diameter. During winding, the yarn is laid in a prescribed manner, in particular in a crosswise manner, across the width of the bobbin by means of a traversing device. Here, since the yarn feed speed is constant, the yarn periodically slackens, and therefore in order to maintain the desired yarn tension, it is necessary to compensate for the sag during the shortening of the yarn working path along the yarn travel path.

[0003] In addition to compensating for the yarn sag, it is inevitable to keep the yarn tension substantially constant during the winding process. It is already known from the prior art, for example from EP2955142A1, to design the yarn storage unit with a yarn guide arm which is rotated into the area of the yarn travel path and thus forms a loop to briefly extend the length of the normal working path of the yarn. Here, the yarn guide arm is usually pivotally mounted and positioned about a pivot transversely to the yarn travel path by means of a controllable electric drive device. The control of the electric drive device is carried out by a control system which obtains initial information to control a yarn tension sensor. Depending on the yarn tension present during winding, the control system reacts in a prescribed manner to control the electric drive device and thus the yarn guide arm, whereby the yarn tension can be increased or decreased.

[0004] However, the known systems have the disadvantage that they are not suitable for maintaining the yarn tension substantially constant for a long time, especially at higher winding speeds, especially when the yarn tension changes frequently due to different influences. Summary of the Invention

[0005] In view of this, the present invention is based on the task of providing a yarn storage unit which particularly reliably allows the yarn tension to be maintained substantially constant during the winding process.

[0006] The present invention accomplishes this task by means of a yarn storage unit, a station comprising such a yarn storage unit, and a method for adjusting the yarn tension at such a station.

[0007] The yarn storage unit according to the present invention is characterized in that the yarn guide arm is rotatably mounted and has a first engaging member with a magnetic action spaced from the pivot axis. Additionally, the drive unit has a second magnetic engaging member arranged adjustably relative to the first engaging member and exerting a magnetic repulsive action on the first engaging member. The second magnetic engaging member can hereby be placed by the drive unit in an effectively connected arrangement with the first engaging member on the drive unit, wherein the movement of the second engaging member towards the first engaging member causes a co-directional displacement of the first engaging member and thus a pivoting of the yarn guide arm.

[0008] Different from previously known yarn storage units (wherein the yarn guide arm is directly forced to rotate on the drive shaft of the drive unit, for example, by a position-fixed mounting and the force transmission thus strictly occurs through components in contact with each other along the force flow), the yarn guide arm according to the present invention is now rotatably mounted on the drive shaft of, in particular, the drive unit. Thereby, the rotational force generated by the drive shaft can be transmitted to the yarn guide arm non-contactingly by means of magnetic action means. According to the present invention, the first and second engaging members are thus aligned with each other in such a direction that they exert a magnetic repulsive action relative to each other. As a result, when the second engaging member is displaced towards the first engaging member by the drive unit, the repulsive action between the first and second engaging members causes a displacement of the first engaging member corresponding to the movement direction of the second engaging member. Thereby, the connection of the first engaging member to the yarn guide arm causes it to pivot about the pivot axis. In this regard, the displacement of the yarn guide arm about its pivot axis occurs non-contactingly by the drive unit according to the set position of the second engaging member arranged on the drive unit.

[0009] The yarn guiding arm is pivotally mounted about a pivot axis into the yarn travel path, and a loop-like yarn path within the area of the yarn storage unit is generated by the yarn guiding arm, wherein the yarn guiding arm preferably contacts the yarn within the area between two yarn guiding rollers or yarn guiding loops arranged along the yarn travel path, so as to generate a defined loop path accordingly. Through these two engagement members, a non-contact adjustment movement of the yarn guiding arm is achieved by the drive unit. If there is excess yarn during the winding process that causes the yarn tension to decrease, it is accommodated in the loop between the preferably pre-determined paired yarn guiding rollers or loops and the yarn guiding arm. If there is less yarn than required for the winding bobbin, such as a cross-wound bobbin, during the winding process and thus the yarn tension increases, the required yarn length is released from the loop by a reverse displacement of the yarn guiding arm, wherein for this purpose the second engagement member is adjusted and moved by the drive unit such that the yarn guiding arm is pivoted in the opposite direction to displace the yarn, and the reverse rotation of the yarn guiding arm at this time results from the yarn tension acting on the yarn guiding arm. Therefore, the yarn guiding arm follows the reset movement of the second engagement member and releases the required yarn length in a prescribed manner. The yarn storage unit thus allows a constant yarn tension to be maintained with high precision and high frequency by the freely rotatably mounted yarn guiding arm, so that the winding process can also be carried out at a very high winding speed, and the manufacture of cylindrical winding bobbins and conical winding bobbins can be carried out very reliably.

[0010] Ideally, the adjustment movement of the yarn guiding arm towards the yarn or towards the opposite direction is carried out without changing the distance between the first and second engagement members and thus without changing the magnetic spring force generated by the spacing between the two engagement members. The adjustment movement of the yarn guiding arm can preferably be adjusted by a control system for controlling the drive unit and a sensor unit that can be connected to the control system to transmit the acquired sensor information. The control system is preferably designed to analyze and evaluate the transmitted sensor information and control the drive unit in a prescribed manner based on the evaluation result. The control system preferably can include a control unit and an analysis and evaluation unit. These units can be the same unit or different from each other. It is also possible to implement the two units with a single unit. The control system can also be a component of the yarn storage device or a separate component therefrom. The arrangement of the control system can also be freely selected. Therefore, the control system can be arranged at the station including the yarn storage unit, the central machine controller, and / or on the textile machine side. Redundant control achieved by providing two such mutually checking or mutually checkable control systems is also possible.

[0011] The sensor unit connectable to the control system is preferably used to detect the rotational movement and / or position of the yarn guide arm, and the change in the distance between the two engaging members caused by the change in the yarn tension can thus also be determined from the sensor information detected by the sensor unit. If the yarn guide arm is displaced towards the position of the second engaging member compared to the position set by the control system, i.e., the distance between the first engaging member and the second engaging member is shortened, the magnetically generated spring force acting between the first and second engaging members increases. Considering the known and previously stored magneto-spring force characteristic curve in the control system or in a readable storage unit engaged with the control system, the control system can infer the spring tension acting on the spring and thus the yarn tension. As a result, the control system can check, adjust, and / or constantly maintain the yarn tension by correspondingly controlling the drive unit due to the change in the position of the second engaging member relative to the first engaging member.

[0012] The yarn storage unit thus allows, in particular, to maintain a constant yarn tension with particularly high accuracy and high frequency.

[0013] The design of the second engaging member being displaced relative to the first engaging member by means of the drive unit can in principle be carried out in any way. For example, a linear drive device can be considered here, which linearly adjusts the second engaging member towards the first engaging member transversely to the pivot axis and thus causes the yarn guide arm to be displaced.

[0014] According to a particularly advantageous design of the present invention, it is provided that the second engaging member is arranged on a support that can be adjusted coaxially about the pivot axis of the yarn guide arm by means of the drive unit. According to this design of the present invention, the second engaging member can be adjusted about the pivot axis of the yarn guide arm, where the second engaging member is arranged on a support connected to the drive unit for this purpose. The pivoting of the support about the pivot axis of the yarn guide arm allows the second engaging member to be arranged on the support connected to the drive unit for this purpose. The pivoting of the support about the pivot axis of the yarn guide arm allows a particularly space-saving rotary drive device to be used for adjusting the second engaging member. In addition, the rotation of the second engaging member arranged at the same distance from the pivot axis as the first engaging member provides a particularly consistent and reliable adjustment movement, so that the yarn guide arm can be displaced very precisely by the control system through the displacement of the support.

[0015] The arrangement of the first engaging member on the yarn guide arm can in principle be freely selected. According to a particularly preferred design of the present invention, it is provided that the first engaging member can be detachably fixed to the yarn guide arm and / or the second engaging member can be detachably fixed to the drive unit. This design of the present invention allows the first and / or second engaging members to be simply switched as needed, so that it can be adapted to different production conditions that may require different magnetic effects in a simple manner. In addition, repair work can be carried out particularly simply and quickly.

[0016] The design of the drive unit for shifting the second engaging member, in particular the support, can in principle be freely selected, and various different motor drive devices can be used here. However, according to a particularly advantageous design of the present invention, it is provided that the drive unit has an electric motor, in particular a stepper motor having a drive shaft, the drive shaft being non-rotatably connected to the support and the yarn guide arm being rotatably mounted on the drive shaft. Particularly preferably, the guide arm has a support unit, in particular a bush, at one end thereof, by means of which the yarn guide arm can be placed on the free end of the drive shaft. The support unit is designed to rotatably support the yarn guide arm on the free end of the drive shaft independently of the rotation of the drive shaft. In addition, the yarn guide arm preferably has a yarn guiding part, in particular a yarn guiding loop or a yarn guiding roller, at its other free end for contacting and guiding the yarn. Thereby, the lever effect of the yarn guide arm can be utilized to the greatest extent. It is also conceivable according to another preferred embodiment for the support unit and the yarn guiding part to be arranged at other positions selected as required along the longitudinal extension axis of the yarn guide arm.

[0017] According to this design of the present invention, by means of a reversibly operating electric motor, very precise adjusting movements of the support around the pivot axis of the yarn guide arm can be achieved. In addition, the drive shaft is used for rotatably accommodating the yarn guide arm, and here, rotatable mounting or rotatability generally means a torque-free connection between the drive shaft and the yarn guide arm, such that the drive shaft is solely used for the rotation of the yarn guide arm, in particular for rotatable mounting, but no torque is transmitted to the yarn guide arm. The corresponding design of the yarn storage unit also allows for a very compact design, wherein it is ensured in a very reliable manner that the second engaging member arranged on the support can be adjusted within the same circumference range of the drive shaft and can be arranged on the yarn guide arm at a corresponding distance from the axis of the drive shaft like the first engaging member.

[0018] The design principle of the first engaging member and the second engaging member obtaining a magnetic repulsive force from each other can in principle be freely selected. Thus, the first and / or the second engaging member can be designed as an electromagnet, the magnetic field of which is oriented such that they produce a repulsive force against each other. The electromagnet can be controlled by the control system here, and thus different magnetic fields can be generated as required thereby, so that the repulsive force can be adjusted and in particular controlled by the corresponding control system.

[0019] According to a particularly advantageous design of the present invention, it is provided that the first engaging member and the second engaging member are designed as permanent magnets. Using permanent magnets as the engaging members arranged on the yarn guide arm and the support in a correspondingly oriented manner is a particularly simple, low-maintenance and low-cost way of providing a magnetic repulsive force. Here, the desired repulsive force can be determined by selecting the permanent magnets.

[0020] The connection of the support to the drive unit, in particular to the preferably provided motor-driven shaft, can be produced by a simple flange connection. However, according to an improved embodiment of the present invention, it is provided that the support is arranged on a coupling disk which is coaxially arranged with the drive shaft and is non-rotatably connected to the drive shaft. The use of the coupling disk ensures a very reliable displacement of the support and the second coupling member connected to the support about the pivot of the yarn guide arm. The coupling disk can in this case be abutted against a corresponding mating surface of the preferably provided motor for guiding in a planar form.

[0021] The sensor unit, which can in principle be arranged in any position, is used to detect the rotation and / or position of the yarn guide arm, in particular in order to identify a deviation of the position of the yarn guide arm relative to the position set by the control system via the drive unit. According to a preferred design of the present invention, it is provided that the sensor unit is designed and arranged to obtain the rotation angle and / or position of a connecting member which is non-rotatably connected to the yarn guide arm and is coaxially arranged with the drive shaft, wherein the sensor unit is further preferably coaxially arranged relative to the connecting member. According to this design of the present invention, the connecting member non-rotatably connected to the yarn guide arm extends locally into the sensor unit which is spaced from the end of the drive shaft. The corresponding arrangement of the sensor unit, in particular the arrangement preferably set to be coaxial with the connecting member, allows very accurate detection of the rotation and / or position of the yarn guide arm and also allows the yarn storage unit to be designed to be very compact.

[0022] According to another aspect of the present invention, there is provided a work station of a textile machine, in particular a spinning position or a winding position, which comprises a yarn storage unit according to the embodiments described above. The work station is further equipped with a yarn feeding device for feeding yarn, a traversing device for traversing the fed yarn, and a yarn winding device for winding the traversed yarn onto a winding bobbin. The yarn feeding device, the traversing device and the yarn winding device are arranged along the yarn movement path for processing the yarn accordingly. The yarn movement path is a path from the yarn feeding position to the winding position, along which the yarn moves during its winding process without being affected by the yarn storage unit. The yarn storage unit is also arranged along the yarn movement path between the yarn feeding device and the traversing device so as to displace the moving yarn out of the yarn movement path during the winding process by means of the pivoting movement of the yarn guide arm. In particular, preferably, the yarn guide arm is arranged along the yarn movement path between two yarn guide rollers or yarn guide loops through which the yarn is guided or guided past during its winding process. The yarn guide rollers or yarn guide loops can in this case be carried by a waxing device provided upstream of the traversing device along the yarn movement path and are arranged upstream of the waxing body of the waxing device. This allows the yarn storage unit to be arranged reliably close to the traversing device in the case of uniform wear of the waxing body and uniform waxing of the yarn in the width range extending transversely to the yarn movement path by means of the lateral back-and-forth movement of the yarn transverse to the yarn movement path generated by the traversing device.

[0023] According to a preferred embodiment, the station is equipped with a control system as described above and a sensor unit as described above that can be connected to the control system for exchanging information, wherein the sensor unit is designed and arranged to detect the rotational movement and / or position of the yarn guide arm and transmit the sensor information to the control system. The control system is preferably designed to analyze and evaluate the transmitted sensor information and control the drive unit in a prescribed manner based on the evaluation result. More preferably, the control system is designed to control the drive unit to adjust the yarn tension and / or storage amount of the guided yarn and also control the sensor unit to call up the sensor information.

[0024] According to a preferred embodiment, the static position of the yarn guide arm is arranged in a position that crosses the yarn moving path, in which the yarn guided by the yarn guide arm is expelled from the yarn moving path during the winding process. In other words, the yarn storage unit is arranged along the yarn moving path with the yarn guide arm in such a way that the static position of the yarn guide arm corresponding to the zero position of the drive unit is outside the yarn moving path and is located in the direction in which the yarn guide arm expel the yarn from the yarn moving path. Therefore, it can be ensured that the yarn guide arm can be reset when it deviates from the yarn moving path only by the force applied to the yarn generated toward the yarn moving path. Alternatively or additionally, the yarn storage unit can also have a magnetically acted or mechanically spring-forced engaging member, which is opposite to the magnetic force acting direction of the first and second engaging members and is designed to reset the yarn guide arm opposite to the offset direction caused by the first and second engaging members as required. Other engaging members can preferably be connected to the drive unit and the control system connected thereto such as the aforementioned control system and the sensor unit or another sensor unit accordingly, just like the first and second engaging members, so as to pivot the yarn guide arm as required.

[0025] According to another aspect of the present invention, a method for adjusting the yarn tension of a moving yarn at a workstation according to one of the aforementioned embodiments is proposed. The sensor unit now transmits sensor information related to the rotation and / or position of the yarn guide arm to a control system assigned to the workstation. The control system analyzes the magnetic force acting between the first and second engaging members based on the transmitted sensor information to identify the yarn tension applied to the yarn, and controls the drive unit to change the yarn guide arm position in a prescribed manner as described above when the deviation from the limit value or limit value range for the yarn tension is evaluated as not allowed. As previously mentioned, the yarn tension can be kept constant during the winding process and adjusted as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] An embodiment of the present invention will be explained below with reference to the accompanying drawings, which show:

[0027] Figure 1 A schematic perspective view showing a yarn storage unit according to one embodiment;

[0028] Figure 2 Shown in a perspective schematic view Figure 1 An enlarged view of a partial area of the yarn storage unit;

[0029] Figure 3 Shown in a perspective schematic view Figure 1 An enlarged view of the yarn storage unit without the yarn guide arm;

[0030] Figure 4 Shown Figure 1 A perspective schematic view of the yarn guide arm of the yarn storage unit; and

[0031] Figure 5 Shown in a perspective schematic view as Figure 1 The yarn storage unit arranged on the waxing device as shown.

[0032] List of reference numerals

[0033] 1 Yarn storage unit

[0034] 2 Yarn guide arm

[0035] 3 Sensor unit

[0036] 4 Drive unit

[0037] 5 Motor

[0038] 6 First joint

[0039] 7 Second joint

[0040] 8 Support

[0041] 9 Holder

[0042] 10 Housing

[0043] 11 Housing cover

[0044] 12 Another bushing

[0045] 13 Yarn guide loop

[0046] 14 Joint plate

[0047] 15 Connecting piece

[0048] 16 Drive shaft

[0049] 17 Connecting plate

[0050] 18 Bushing

[0051] 19 Terminal

[0052] 20 Waxing device

[0053] 21 Yarn guide roller

[0054] 22 Base

[0055] F Yarn movement path

[0056] S Pivot Detailed implementation manner

[0057] Figure 1 The yarn storage unit 1 according to an embodiment is shown in a perspective schematic view, which is connected to a connecting plate 17 for being arranged at a working station of a textile machine (not shown here), especially a spinning position or a winding position. Figures 2 to 4 Shown in a perspective schematic view Figure 1 An enlarged view of a partial area of the shown yarn storage unit 1 and a perspective schematic view of the yarn guiding arm 2 of the yarn storage unit 1.

[0058] The yarn storage unit 1 has a yarn guiding arm 2, which is arranged on the yarn movement path F of the yarn to be wound onto a winding bobbin at a working station with a yarn guiding loop 13 arranged at its free end, and the yarn is guided through the yarn guiding loop 13. In order to form a yarn storage device, the yarn guiding arm 2 is pivotally mounted on the drive shaft 16 of the motor 5 of the drive unit 4 of the yarn storage unit 1. For this purpose, the yarn guiding arm 2 has a bushing 18 for being arranged at the free end of the drive shaft 16, so that the yarn guiding arm 2 is mounted on the drive shaft 16 without torque. The bushing 18 is also connected to a holding member 9 connected to the yarn guiding arm 2, and the holding member has an opening for accommodating a first engaging member 6 designed as a permanent magnet.

[0059] In order to pivot the yarn guiding arm 2 to form a loop during operation, the drive shaft 16 of the motor 5 is non-rotatably connected to a engaging disk 14, and the engaging disk is coaxially arranged relative to the drive shaft 16. A support 8 is provided on the engaging disk 14, and the support has another bushing 12 for accommodating another permanent magnet as a second engaging member 7. Here, the permanent magnets on the yarn guiding arm 2 and the support 8 are aligned with each other such that they exert a mutually repulsive magnetic force. The engaging disk 14 is rotated by the reversibly operating motor 5, thus causing the corresponding pivoting of the yarn guiding arm 2 around the drive shaft 16 of the defined pivot S non-contactly, and the control of the motor 5 by a control system (not shown) is carried out through the terminal 19.

[0060] For the drawing view, a sensor unit 3 is arranged on the cover 11 of the housing 10 above the drive shaft 16 for identifying the position of the yarn guiding arm 2. The sensor unit is coaxially arranged with its sensor for identifying the pivoting angle relative to a terminal member 15 connected to the yarn guiding arm 2, and the terminal member extends in the longitudinal axis direction of the drive shaft 16.

[0061] The rotational movement or position of the yarn guide arm 2 can be determined particularly reliably by means of the sensor unit 3, and the deviation of the yarn guide arm 2 from the position set by the drive unit 4 can be determined therefrom by transmitting the corresponding sensor information to the control system. For example, if the yarn tension increases, this causes the yarn guide arm 2 to be displaced towards the second engagement member 7 against the spring force generated by the magnetic repulsion. As a result, the return movement of the engagement disk 14 can thus be carried out by the control system. If, for example, the yarn tension decreases during the sagging relaxation of the yarn, this causes the second engagement member 7 to be displaced as the drive shaft 16 and the support 8 engaged therewith together with the engagement disk 14 and the permanent magnet rotate towards the yarn guide arm 2. The magnetic repulsion causes the yarn guide arm 2 to be driven in the same direction, whereby the guided yarn is displaced out of its yarn movement path or further away from the yarn movement path and a yarn loop is formed or enlarged. A substantially constant yarn tension can be obtained and ensured during the entire winding or winding process.

[0062] Figure 5 An embodiment of the yarn storage unit 1 arranged at a station not shown is shown in a perspective schematic view, where the station can be a spinning position or a winding position. The yarn storage unit 1 is arranged along the yarn movement path F extending from a not-shown yarn feeding device to a not-shown traversing device, upstream of a waxing device 20 which is arranged upstream of the traversing device along the yarn movement path F and is only shown schematically in part. The waxing device 20 has a base 22 below, on which two yarn guide rollers 21 are rotatably held, and the yarn is guided along the yarn movement path in a partially wound manner by the yarn guide rollers. The yarn storage unit 1 is positioned on the yarn movement path F such that the yarn guide arm 2 can rotate its guide loop 13 into the yarn movement path F in order to displace the moving yarn out of its yarn movement path F transversely to the arrangement direction of the yarn guide rollers 21. The yarn contacts the yarn guide rollers 21 as it is displaced out of its yarn movement path F by means of the yarn storage unit 1, and a yarn loop of a defined size is thus formed between the yarn guide rollers 21. The size of the yarn loop is changed as required by means of the yarn storage unit 1 according to the measured rotation or position of the yarn guide arm 2 by means of a control motor 5 and thus the control system of the yarn guide arm 2 in order to set and adjust a constant yarn tension which is advantageous for the winding process.

Claims

1. A yarn storage unit (1) for a station of a textile machine, the yarn storage unit (1) having: a yarn guide arm (2) pivotally mounted about a pivot (S), and a controllable drive unit (4) for reversibly pivoting the yarn guide arm (2), characterized in that The yarn guide arm (2) is mounted in a freely rotatable manner and has a first engaging member (6) with a magnetic action spaced from the pivot axis (S), and the drive unit has a magnetic second engaging member (7), which is arranged so as to be adjustable relative to the first engaging member (6) and exerts a magnetic repulsive action on the first engaging member (6), the magnetic second engaging member being arranged on the drive unit (4) so as to be placed in effective connection with the first engaging member (6), wherein the adjustment of the second engaging member (7) towards the first engaging member (6) causes a co-directional displacement of the first engaging member (6).

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

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

4. The yarn storage unit (1) according to claim 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 connected to the support (8) and the yarn guide arm (2) being mounted on the drive shaft (16) in a freely rotatable manner.

5. The yarn storage unit (1) according to claim 1, characterized in that The first engaging member (6) and the second engaging member (7) are designed as permanent magnets.

6. The yarn storage unit (1) according to claim 4, characterized in that The support (8) is arranged on a connecting disk (14), which is coaxially arranged with the drive shaft (16) and is non-rotatably connected to the drive shaft (16).

7. The yarn storage unit (1) according to claim 4, characterized in that The yarn storage unit (1) is assigned a sensor unit (3), which is designed and arranged to detect the rotational movement and / or position of a connecting member (15) non-rotatably connected to the yarn guide arm (2).

8. The yarn storage unit (1) according to claim 7, characterized in that The sensor unit (3) is designed and arranged to detect the rotational movement and / or position of a connecting member (15) non-rotatably connected to the yarn guide arm (2) and coaxially arranged relative to the drive shaft (16).

9. A station of a textile machine, the station comprising: A yarn feeding device for feeding yarn; A traversing device for traversing the fed yarn; and A yarn winding device for winding the traversed yarn onto a winding bobbin, these devices being arranged along the yarn movement path, characterized in that a yarn storage unit (1) according to claim 1 is provided, which is arranged along the yarn movement path between the yarn feeding device and the traversing device so as to extrude in a defined manner the yarn moving along the yarn movement path by means of the pivoting movement of the yarn guide arm (2).

10. The station according to claim 9, characterized in that The rest position of the yarn guide arm (2) is set in a position traversing the yarn movement path, in which the yarn guided by the yarn guide arm (2) is extruded from the yarn movement path during the winding process.

11. The station according to claim 9 or 10, characterized in that The work station is assigned a control system and a sensor unit (3) that can be connected to the control system to exchange information, wherein the sensor unit (3) is designed and arranged to detect the rotational movement and / or position of the yarn guide arm (2) and to transmit sensor information to the control system, and wherein the control system is designed to analyze and evaluate the transmitted sensor information and to control the drive unit (4) in a prescribed manner based on the evaluation result.

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

13. A method for adjusting the yarn tension of a moving yarn at the station according to claim 12, wherein The sensor unit (3) transmits sensor information related to the rotational movement and / or position of the yarn guide arm (2) to the control system assigned to the work station, and the control system evaluates the magnetic force acting between the first engagement member (6) and the second engagement member (7) based on the transmitted sensor information to identify the yarn tension and controls the drive unit (4) in a prescribed manner to change the position of the yarn guide arm (2) when the difference between the yarn tension and a limit value or a range of limit values is evaluated as unreliable.

Images