CN119059366A

CN119059366A - Workstation for a textile machine and method for monitoring the yarn running of a running yarn at a workstation for a textile machine

Info

Publication number: CN119059366A
Application number: CN202410545812.8A
Authority: CN
Inventors: J·斯普雷彻; A·容克尔; D·弗罗施; E·贝尔; H-J·波伊克; J·达尔曼斯; M·雷斯扎特
Original assignee: Saurer Spinning Solutions & CoKg GmbH
Current assignee: Saurer Spinning Solutions & CoKg GmbH
Priority date: 2023-05-31
Filing date: 2024-05-06
Publication date: 2024-12-03
Also published as: US20240400341A1; LU504357B1; EP4470952A1; MX2024006390A

Abstract

The invention relates to a method for monitoring the yarn running of a running yarn at a workstation of a textile machine, and to a textile machine having a yarn feeding device for feeding yarn, a traversing device for traversing the fed yarn, a yarn winding device for winding the traversed yarn onto a running spool, a pneumatic yarn store and a yarn storage unit having a yarn guiding arm pivotably mounted about a pivot axis, a controllable drive unit for reversibly pivoting the yarn guiding arm and a sensor unit designed and arranged to collect sensor information about the yarn tension acting on the yarn guiding arm and/or the position of the yarn guiding arm and to transmit the sensor information to a control system associated with the workstation. In order to provide a method for monitoring the yarn running of a running yarn at a workstation of a textile machine and a workstation of a textile machine that can be produced and run in a particularly economical manner, it is provided that the yarn storage unit is arranged at the workstation such that the control system detects yarn breaks and/or empty pneumatic yarn stores based on the transmitted sensor information.

Description

Textile machine workstation and method for monitoring yarn running of running yarn at textile machine workstation

The invention relates to a method for monitoring yarn running of running yarn at a workstation of a textile machine and a workstation of a textile machine, comprising:

a thread feeding device for feeding a thread,

A traversing device for traversing the supplied yarn,

A yarn winding device for winding the traversed yarn onto a running spool,

-A pneumatic yarn reservoir, and

-A yarn storage unit comprising

A yarn guiding arm mounted to be pivotable about a pivot axis,

-A controllable drive unit for reversibly pivoting the yarn guiding arm, and

-A sensor unit designed and arranged for collecting sensor information about yarn forces acting on the yarn guiding arm, rotational movements and/or positions of the yarn guiding arm, and for transmitting the sensor information to a control system associated with the workstation.

In connection with work stations, in particular spinning and/or winding stations of textile machines, such as spinning and winding machines, it is known practice to install a controlled yarn storage unit for winding spools (for example conical cross-winding spools) along the yarn travel path upstream of the traversing device. For example, these yarn storage units are used to regulate yarn sagging that occurs when winding a spool at a constant feed line speed of a spinning device or a spinning clew-up device. In known textile machines, the running spool is usually fixed in a pivotally mounted creel of the yarn winding device downstream of the traversing device during the winding process or spool movement and is usually connected by friction or driven separately by friction rollers. In particular, the winding speed of the operating spool corresponds to a constant feeding speed of, for example, a spinning device, which depends on the winding diameter of the spool. During winding, the yarn is arranged over a spool width defined by the traversing means, in particular in the transverse direction. Due to this constant feed speed, the yarn will come loose periodically, so that it is necessary to compensate for sagging while shortening the working path of the yarn along the yarn running path, thereby maintaining the desired yarn tension.

In addition to compensating for yarn sagging, it is desirable to keep the yarn tension substantially constant during the winding process. From the prior art, for example EP2 955,142 A1, it is known to design a yarn storage unit with a yarn guiding arm which is pivoted into the region of the yarn running path and thereby temporarily lengthens the length of the normal working path of the yarn in a looped manner. The yarn guiding arm is typically mounted so as to be pivotable about a pivot axis transverse to the yarn path by means of a controllable and positionable electric drive. The electric drive is actuated by a control system which receives output information for actuating the yarn tension sensor. The control system controls the electric drive specifically and thus the yarn guiding arm in dependence on the yarn tension occurring during winding, so that the yarn tension can be reduced or increased.

In addition to the yarn storage unit with the yarn guiding arm, the known workstation has a pneumatic yarn reservoir for accommodating the yarn loops in the yarn storage tube, wherein the workstation can fill the yarn storage tube with suction air as required. A suction air flow is applied to the yarn storage tube such that a negative pressure occurs at the yarn inlet opening of the yarn storage tube such that the yarn extending in front of the yarn inlet opening is sucked into the yarn storage tube. At the beginning of the working process (for example at the time of engagement), preferably a pneumatic yarn store is used in the workstation, wherein the length of yarn which cannot be wound up due to the speed of the operating spool being too low is initially temporarily stored in the yarn storage tube for a period of time from the start of the yarn winding device to the operating speed during normal operation.

Considering yarn that is still in the pneumatic yarn reservoir, it is critical for efficient and error-free operation of the workstation. Without a suitable sensor system, the filling quantity of the yarn storage tube is calculated mathematically by means of, for example, the difference between the take-up speed of the spinning station and the rotational speed of the operating spool. Because of different influencing factors, such as slippage of the runlength during acceleration, and other factors, the mathematical calculation of the stored yarn length only provides an approximation, the emptying of the pneumatic yarn reservoir needs to be done carefully to prevent unwanted yarn tension from occurring in the windings on the runlength. In addition, since it is not possible to determine whether the yarn reservoir is full or empty, it is necessary to supply the pneumatic yarn reservoir with sucked air for a longer time than theoretically required, resulting in an increase in energy consumption.

Furthermore, the detection of yarn breaks is critical for the operation of the workstation, for which reason separate components, so-called yarn monitors, are often used in the workstation for detecting yarn breaks and possibly for starting the necessary process steps of the workstation for further operation of the workstation. The use of a separate yarn monitor requires increased installation and maintenance effort, for example, because of the need for a control system connected to the workstation, and also the necessary adjustments and monitoring to achieve the required functional reliability.

The object of the present invention is to provide a method for monitoring the yarn running of a running yarn at a workstation of a textile machine, and a workstation of a textile machine which can be produced and operated in a particularly economical manner.

The invention achieves this object by a workstation having the features according to claim 1 and a method for monitoring yarn operation having the features according to claim 11. Advantageous further embodiments of the invention are given in the dependent claims.

The workstation according to the invention is characterized in that the yarn storage unit is arranged at the workstation such that the control system detects yarn breaks and/or empty pneumatic yarn reservoirs based on the transmitted sensor information.

According to the invention, the yarn storage unit is arranged at the workstation in such a way that by means of the sensor information collected by the sensor unit, i.e. by means of the yarn force acting on the yarn guiding arm, the rotational movement and/or the position of the yarn guiding arm, the control system associated with the sensor unit can recognize the yarn breakage and/or recognize the filling state of the pneumatic yarn reservoir. For example, if the yarn force acting on the yarn guiding arm drops significantly, or if the yarn force does not act on the yarn guiding arm, it may be concluded that a yarn break has occurred, so that a subsequent process step at the workstation may be started, for example by the control system, for restarting. The arrangement according to the invention of the yarn storage unit can thereby also dispense with a separate yarn monitor.

The arrangement according to the invention of the yarn storage unit at the workstation and the yarn guide arm in the yarn running region also make it possible to reliably determine the filling quantity of the pneumatic yarn store by means of the applied yarn force or yarn tension and/or the position of the yarn guide arm that can be determined therefrom. If it is reliably determined that the pneumatic yarn reservoir has been emptied, the suction air operating the pneumatic yarn reservoir can be directly shut off, so that the workstation can be operated in an energy-saving manner.

In addition to or alternatively to the pneumatic yarn store in which the yarn break or the emptying is determined by the yarn force acting on the yarn guide arm and/or the yarn tension determined by the yarn force, the pneumatic yarn store in which the yarn break and/or the emptying is reliably detected by sensor information about the position of the yarn guide arm. By comprehensively evaluating the position of the yarn guide arm and the yarn force acting on the yarn guide arm, a reliable detection of an empty pneumatic yarn reservoir and/or thread breakage can be achieved in a complementary manner, thereby ensuring a particularly reliable operation of the workstation.

The control system, which can be connected to the sensor unit, can determine the yarn force and/or the yarn tension and/or the position of the yarn guide arm, which can be determined therefrom, from the sensor information collected by the sensor unit. The operating state can be deduced from the known characteristic values previously stored in the control system or in a readable memory unit coupled to the control system, and subsequently the yarn breakage and/or the emptying of the pneumatic yarn store can be reliably detected.

According to a particularly advantageous embodiment of the invention, the precondition is that the control system is designed to stop the suction air flow for operating the pneumatic yarn store and/or to interrupt the working process occurring at the workstation.

The control system may preferably comprise a control unit and an evaluation and estimation unit. The units may be the same unit or different units from each other. Two units with a single unit may also be implemented. In addition, the control system may be a component of the yarn storage unit or a component separate therefrom. The arrangement of the control system can also be freely selected. The control system may thus be arranged in a workstation comprising the yarn storage unit, in a central machine control system, and/or remotely from the textile machine. Redundancy control may also be achieved by providing two control systems that check against each other or that can check against each other. According to an advantageous embodiment of the invention, the control system is preferably designed to directly control the drive unit regulating the suction air flow and to interrupt this suction air flow when the pneumatic yarn reservoir is emptied. Additionally or alternatively, the control system according to another embodiment of the invention may also be arranged to interrupt the working process of the workstation directly, so that in case of detection of a yarn breakage or an empty yarn reservoir, the suction air flow may be interrupted directly, or the process steps in the workstation may be started after the yarn breakage.

The design of the sensor unit for detecting the yarn force, the rotational movement and/or the position of the yarn guiding arm can be selected substantially freely. According to a particularly advantageous embodiment of the invention, however, the sensor unit has an incremental encoder which is particularly suitable for detecting the position of the yarn guiding arm and the yarn force acting on the yarn guiding arm.

According to a development of the invention, the precondition further comprises that the control system is designed to control the drive unit to adjust the yarn tension and/or the storage of the guided yarn. According to such an embodiment of the invention, the control system may adjust the movement of the yarn guiding arm by controlling the control system of the drive unit, whereby the yarn guiding arm may be adjusted in the direction of the yarn or in the opposite direction. By pivoting the yarn guiding arm about the pivot axis into the yarn path, the yarn guiding arm forms a loop-forming course of the yarn in the region of the yarn storage unit, wherein the yarn guiding arm preferably engages with the yarn in the region between two yarn guiding rollers or apertures arranged along the yarn running path, thereby forming a defined loop-shaped thread.

If excess yarn occurs during the winding process, resulting in a reduced yarn tension or yarn force acting on the yarn guide arms, the excess yarn is contained in the loop between a pair of yarn guide rollers or apertures, preferably provided, and the yarn guide arms. Conversely, if less yarn is produced during winding than is required to run the spool (e.g., cross-wound spool), resulting in an increase in yarn tension or yarn force acting on the yarn guide arm, the desired amount of yarn is released from the loop by reverse displacement of the yarn guide arm, wherein the yarn guide arm pivots in the opposite direction pushing the yarn away, wherein the rearward pivoting of the yarn guide arm is due to the yarn force acting on the yarn guide arm. The control system can thus keep the yarn tension constant by precisely and with high frequency controlling the drive unit directly by the yarn guiding arm, so that the winding process can be carried out at particularly high winding speeds, wherein the production of cylindrical and conical operating bobbins can be carried out particularly reliably.

According to another embodiment of the invention, the yarn guiding arm is mounted freely rotatable and has a magnetically active first coupling element arranged at a distance from the pivot axis. In addition, the drive unit has a second magnetic coupling element which is adjustably arranged relative to the first coupling element and acts on the first coupling element in a magnetically repulsive manner. The second magnetic coupling element is arranged on the drive unit so as to be operatively connectable with the first coupling element by the drive unit, wherein an adjustment of the second coupling element in the direction of the first coupling element causes a displacement of the first coupling element in the same direction and thereby a pivoting of the yarn guiding arm.

According to this embodiment of the invention, the yarn guiding arm is now free to rotate, in particular mounted on the drive shaft of the drive unit, in contrast to the known yarn storage units in which the yarn guiding arm is forced to rotate directly on the drive shaft (e.g. by means of a fixed bearing) by means of the drive shaft of the drive unit, so that forces are transmitted strictly through components that are in contact with each other along the force flow. The rotational force generated by the drive shaft can thus be transmitted contactlessly to the yarn guiding arm by means of magnetically acting means. The first coupling element and the second coupling element are oriented relative to each other such that they produce a mutually exclusive magnetic effect. Thus, during displacement of the second coupling element by the drive unit in the direction of the first coupling element, the first coupling element is displaced due to a repulsive effect between the first coupling element and the second coupling element and corresponds to the direction of movement of the second coupling element, whereby the yarn guiding arm is pivoted about the pivot axis due to the first coupling element being connected to the yarn guiding arm. In this case, the yarn guide arm is contactlessly displaced about its pivot axis by the drive unit on the basis of the set position of the second coupling element arranged on the drive unit.

According to a particularly advantageous embodiment of the invention, the precondition is that the second coupling element is arranged on a support which can be adjusted, in particular coaxially, by the drive unit about the pivot axis of the yarn guiding arm. According to such an embodiment of the invention, the second coupling element is adjustable about the pivot axis of the yarn guiding arm, wherein the second coupling element is arranged on a support for this purpose connected to the drive unit. The rotation of the support about the pivot axis of the yarn guide arm makes it possible to adjust the second coupling element using a particularly space-saving rotary drive. In addition, rotating the second coupling element, in particular the second coupling element, which is preferably arranged at the same distance from the pivot axis as the first coupling element, may provide a particularly uniform and reliable adjustment, so that the control system may displace the yarn guiding arm particularly accurately by displacement of the support.

The arrangement of the first coupling element on the yarn guiding arm can in principle be freely selected. According to a particularly preferred embodiment of the invention, the proviso is that the first coupling element is releasably secured to the yarn guiding arm and/or the second coupling element is releasably secured to the drive unit. Such an embodiment of the invention makes it possible to easily exchange the first coupling element and/or the second coupling element if necessary, so that different production conditions, which may require a deviation from each other's magnetic effect, can be accommodated in a simple manner. In addition, maintenance and repair work can be performed particularly conveniently and quickly.

The design of the drive unit for displacing the second coupling element, in particular the support, can be selected substantially freely, wherein different motor drives can be used. However, according to a particularly advantageous embodiment of the invention, the precondition is that the drive unit has an electric motor, in particular a stepper motor, which has a drive shaft which is connected to the support in a rotationally fixed manner and on which the yarn guide arm is freely adjustably mounted. It is particularly preferred that the free end of the guide arm has a bearing unit, in particular a bushing element, by means of which the yarn guide arm can be placed on the free end of the drive shaft. The bearing unit is designed to allow the yarn guiding arm to rotate freely on the free end of the drive shaft, independent of the rotational movement of the drive shaft, i.e. torque-free. In addition, the yarn guiding arm preferably has a yarn guiding portion, in particular a yarn guiding hole or roller, at its other free end to contact and guide the yarn. The lever effect of the yarn guide arm can thereby be utilized to a maximum extent. According to another preferred embodiment, other arrangement positions of the bearing unit and the yarn guiding portion along the longitudinal extension axis of the yarn guiding arm may also be selected as desired.

According to this embodiment of the invention, a particularly precise adjustment of the support can be made by means of the counter-electric motor about the pivot axis of the yarn guiding arm. In addition, the drive shaft serves to accommodate the yarn guide arm in a freely rotatable manner, wherein a freely rotatable bearing or a freely rotatable mobility generally means a torque-free connection between the drive shaft and the yarn guide arm, so that the drive shaft serves only for pivoting, in particular for pivotable mounting of the yarn guide arm, but does not transmit any torque to the yarn guide arm. The corresponding embodiment of the yarn storage unit also enables a particularly compact design, in which it is ensured in a particularly reliable manner that the second coupling element arranged on the support can be adjusted on the same circumference around the drive shaft, while the first coupling element is arranged on the yarn guiding arm at a corresponding distance from the axis of the drive shaft.

The embodiments of the first coupling element and the second coupling element that can achieve a magnetic repulsive effect with respect to each other can be selected substantially freely. The first coupling element and/or the second coupling element can thereby be designed as an electromagnet, the magnetic fields of which are oriented such that they produce a mutually repulsive effect. The electromagnets can be controlled by a control system such that they can generate different magnetic fields, so that the repulsive effect can be set and in particular adjusted by the respective control system.

According to a particularly advantageous embodiment of the invention, the precondition is that the first coupling element and the second coupling element are designed as permanent magnets. The use of permanent magnets as coupling elements, which are arranged in a corresponding alignment on the yarn guiding arm and the support, makes it possible to provide a magnetic repulsion effect in a particularly simple, low-maintenance and economical manner. In this case, the desired repulsive effect can be defined by selecting the permanent magnets.

The connection of the support element to the drive unit, in particular to the preferably provided drive shaft of the electric motor, can be achieved by a simple flange connection. However, according to a development of the invention, the support is arranged on a coupling disc which is arranged coaxially with the drive shaft and is connected to the drive shaft in a rotationally fixed manner. By using a coupling disc it is ensured that a particularly reliable displacement of the support and the second coupling element connected to the support takes place about the pivot axis of the yarn guiding arm. The coupling disc can rest against a corresponding counter surface of the advantageously arranged electric motor for planar guiding.

According to another aspect of the present invention, a method of monitoring yarn operation of an operating yarn at a workstation of a textile machine according to one of the above embodiments is presented. The sensor unit transmits sensor information about the yarn force acting on the yarn guiding arm, the rotational movement and/or the position of the yarn guiding arm to a control system associated with the workstation. Based on the transmitted sensor information, the control system evaluates the yarn force acting on the yarn guiding arm, the rotational movement and/or the position of the yarn guiding arm. The control system interrupts the working process at the workstation when a yarn break is detected, or stops the suction air flow to operate the pneumatic yarn reservoir when an empty pneumatic yarn reservoir is detected.

Exemplary embodiments of the present invention are explained below with reference to the accompanying drawings. In the drawings:

fig. 1 shows a schematic perspective view of a yarn storage unit according to an exemplary embodiment;

fig. 2 shows an enlarged perspective schematic view of a partial area of the yarn storage unit in fig. 1;

fig. 3 shows an enlarged perspective schematic view of the yarn storage unit of fig. 1 without the yarn guiding arm;

fig. 4 shows a schematic perspective view of a yarn guiding arm of the yarn storage unit of fig. 1, and

Fig. 5 shows a schematic view of the yarn storage unit shown in fig. 1 at a workstation of the textile machine.

Fig. 1 shows a perspective schematic view of a yarn storage unit 1 according to an embodiment, which is connected to a connection plate 17 for arrangement at a workstation 20, in particular a spinning or winding station (not shown here) of a textile machine. Fig. 2 to 4 show an enlarged perspective schematic view of a partial region of the yarn storage unit 1 shown in fig. 1 and a perspective schematic view of the yarn guide arm 2 of the yarn storage unit 1. Fig. 5 shows a schematic representation of the design of a workstation 20 of a textile machine with the yarn storage unit 1 shown in fig. 1.

The yarn storage unit 1 has a yarn guiding arm 2 arranged at the workstation 20, which is provided with a yarn guiding hole 13 at a free end in a yarn path of a yarn 23 to be wound onto a running spool of a yarn winding device 22, wherein the yarn 23 is guided through the yarn guiding hole 13. To form the yarn reservoir, the yarn guide arm 2 is pivotably mounted on a drive shaft 16 of the electric motor 5 of the drive unit 4 of the yarn storage unit 1, wherein for this purpose the yarn guide arm 2 has a bushing 18 to be arranged on the free end of the drive shaft 16, so that the yarn guide arm 2 is mounted on the drive shaft 16 in a torque-free manner. The bushing 18 is furthermore connected to a holder 9, which is connected to the yarn guiding arm 2, which holder has an opening for receiving the first coupling element 6, which is designed as a permanent magnet.

The drive shaft 16 of the electric motor 5 is non-rotatably connected to a coupling disc 14, which is arranged coaxially with the drive shaft 16, to pivot the yarn guiding arm 2 to form a loop in operation. The support 8 is arranged on a coupling disc 14, which support has a further bushing 12 for receiving a further permanent magnet as a second coupling element 7. The permanent magnets of the yarn guiding arm 2 and the support 8 are oriented relative to each other such that they exert a magnetic repulsive effect on each other. Rotation of the coupling disc 14 via the counter-motor 5 thereby causes a corresponding contactless pivoting of the yarn guiding arm 2 about the drive shaft 16, which contactless pivoting defines a pivot axis S, wherein the motor 5 is controlled via the connection 19 by a control system (not shown here).

The sensor unit 3, which is arranged above the drive shaft 16 on the housing cover 11 of the housing 10 in the drawing, serves to detect the position of the yarn guide arm 2 and is arranged such that its sensor detecting the pivot angle is coaxial with a connecting element 15 connected to the yarn guide arm 2, which in turn extends in the direction of the longitudinal axis of the drive shaft 16.

The sensor unit 3 can be used to determine at least the yarn force acting on the yarn guide arm 2, the rotational movement or the position of the yarn guide arm 2, and to detect a deviation between the yarn guide arm 2 and the position set by the drive unit 4 by transmitting corresponding sensor information as described above to the control system. For example, if the yarn force or yarn tension increases, a displacement of the yarn guiding arm 2 in the direction of the second coupling element 7 is caused to counteract the spring force generated by the magnetic repulsion effect. Based on this, the coupling disc 14 can be returned by the control system. For example, if the yarn force or yarn tension decreases as the yarn sags, a displacement of the second coupling element 7 in the direction of the yarn guide arm 2 is caused by the rotation of the drive shaft 16 and the support 8 coupled thereto and the coupling disc 14 and the permanent magnet. Due to the magnetic repulsion effect, the yarn guiding arm 2 moves in the same direction, thereby pushing the guided yarn 23 away from its yarn path or further and forming or expanding a yarn loop. A substantially constant yarn tension can thereby be achieved and ensured during the entire winding process or the spool movement.

Fig. 5 shows a schematic view of a workstation 20 designed as a spinning station of a textile machine (not shown here), during the spinning process, a yarn 23 extending from a yarn feeding device 21 designed as a spinning unit (e.g. an air-spinning or rotor-spinning unit) to a yarn winding device 22 in a yarn running direction F. The fibre composite material 25 fed into the thread feeding device 21, after passing through a drawing system (not shown here) for an air jet spinning machine or an opening device for a rotor spinning machine, generates a twist in the thread feeding device 21.

A pulling device 26 is arranged downstream of the thread feeding device 21 with respect to the thread running direction F, which pulling device pulls the thread 23 leaving the thread feeding device 21 out of the thread feeding device 21 by means of two pulling rolls 27a, 27b forming a pulling roll pair and delivers the thread in the thread winding direction 22. Downstream of the traction device 26 there is again a pneumatic yarn reservoir 28 with a yarn storage tube 29. The yarn storage unit 1 is arranged downstream of the pneumatic yarn storage 28 along the yarn path, wherein the yarn storage unit 1 is placed on the yarn path such that the yarn guiding arm 2 can pivot into the yarn path, pushing the running yarn 23 out of its yarn path. As a result of being pushed away from the yarn path by the yarn storage unit 1, the yarn 23 comes into contact with a yarn guide roller (not shown here) arranged in the region of the yarn storage unit 1, whereby a sized yarn loop is formed therebetween. The size of the yarn loop is variable according to the need of the yarn storage unit 1, which is dependent on the position of the yarn guiding arm 2 by a control system which controls the electric motor 5 and thus the yarn guiding arm 2 to adjust and regulate the yarn tension which is advantageously kept constant when the spool moves.

The arrangement of the yarn storage unit 1 in the region of the pneumatic yarn storage 28 makes it possible to detect a flushing of the pneumatic yarn storage 28 and/or a yarn break by collecting the yarn force applied to the yarn guide arm 2 by the sensor unit 3 via the control system of the sensor unit 3 connected to the yarn storage unit 1 in relation to the position of the yarn guide arm 2 and/or the yarn 23, so that a cumbersome theoretical determination of the yarn length in the yarn storage tube 29 and a separate yarn monitor for detecting yarn breaks is dispensed with. To this end, the control system compares the sensor information with known characteristic values, which were previously stored in the control system or in a readable memory unit coupled to the control system, from which the operating state can be deduced. In the event that the yarn storage tube 29 is empty, the control system may be used to deactivate the drive unit directly which generates the suction air flow in the yarn storage tube 29.

List of reference numerals

1. Yarn storage unit

2. Yarn guiding arm

3. Sensor unit

4. Driving unit

5. Electric motor

6. First coupling element

7. Second coupling element

8. Support member

9. Retainer

10. Outer casing

11. Housing cover

12. Another bushing

13. Yarn guiding hole

14. Coupling disc

15. Connecting element

16. Driving shaft

17. Connecting disc

18. Bushing

19. Connection

20. Work station

21. Wire feeding device

22. Yarn winding device

23. Yarn

25. Fiber composite material

26. Traction device

27A,27b pull rolls

28. Pneumatic yarn storage

29. Yarn storage tube

30. Driving unit

F yarn running direction

S pivot axis.

Claims

1. A workstation (20) of a textile machine, the workstation having:

A thread feeding device (21) for feeding a thread (23),

A traversing device for traversing the supplied yarn (23),

A yarn winding device (22) for winding the traversed yarn (23) onto a running spool,

-A pneumatic yarn reservoir (28), and

-A yarn storage unit (1) having

A yarn guiding arm (2) pivotally mounted about a pivot axis (S),

-A controllable drive unit (4) for reversibly pivoting the yarn guiding arm (2), and

A sensor unit (3) designed and arranged for collecting sensor information about yarn forces acting on the yarn guiding arm (2), rotational movements and/or positions of the yarn guiding arm, and for transmitting the sensor information to a control system associated with the workstation (20),

It is characterized in that the method comprises the steps of,

The yarn storage unit (1) is arranged at the workstation (20) such that the control system detects yarn breaks and/or empty pneumatic yarn reservoirs (28) based on the transmitted sensor information.

2. Workstation (20) according to claim 1, characterized in that the control system is designed to stop the suction air flow operating the pneumatic yarn store (28) and/or to interrupt the working process occurring at the workstation (20).

3. Workstation (20) according to claim 1 or 2, characterized in that the sensor unit (3) has an incremental encoder for collecting the sensor information about the yarn force acting on the yarn guiding arm (2) and/or the position of the yarn guiding arm (2).

4. Workstation (20) according to one or more of the preceding claims, characterized in that said control system is designed to control said drive unit (4) to adjust the yarn tension of said yarn and/or the storage of the guided yarn.

5. Workstation (20) according to one or more of the preceding claims, characterized in that,

-The yarn guiding arm (2) is mounted freely rotatable and has a magnetically active first coupling element (6) arranged at a distance from the pivot axis (S), and

-The drive unit (4) has a second magnetic coupling element (7) which is arranged to be adjustable relative to the first coupling element (6) and acts on the first coupling element (6) in a magnetically repulsive manner, and which is arranged on the drive unit (4) so as to be operatively connectable with the first coupling element (6), wherein an adjustment of the second coupling element (7) in the direction of the first coupling element (6) causes a displacement of the first coupling element (6) in the same direction.

6. Workstation (20) according to claim 5, characterized in that the second coupling element (7) is arranged on a support (8) which is coaxially adjustable about the pivot axis (S) of the yarn guiding arm (2) by the drive unit (4).

7. Workstation (20) according to claim 6, characterized in that the drive unit (4) has an electric motor (5) with a drive shaft (16) which is connected to the support (8) in a rotationally fixed manner and on which the yarn guiding arm (2) is mounted so as to be freely rotatable.

8. Workstation (20) according to claim 6 or claim 7, wherein the support (8) is arranged on a coupling disc (14) coaxially arranged with the drive shaft (16) and connected to the drive shaft (16) in a rotationally fixed manner.

9. Workstation (20) according to one or more of the preceding claims 6 to 8, characterized in that said first coupling element (6) is removably fixed to said yarn guiding arm (2).

10. Workstation (20) according to one or more of the preceding claims 6 to 9, characterized in that said first coupling element (6) and said second coupling element (7) are designed as permanent magnets.

11. Method of monitoring yarn operation of an operating yarn (23) at a workstation (20) of a textile machine according to any one of the preceding claims, wherein the sensor unit (3) transmits sensor information about the yarn force acting on the yarn guiding arm (2), the rotational movement and/or position of the yarn guiding arm (2) to a control system associated with the workstation (20), which control system evaluates the sensor information and:

-interrupting the working process at the workstation (20) upon detection of yarn breakage, and/or

-Upon detection of an empty pneumatic yarn reservoir (28), stopping the suction air flow operating the pneumatic yarn reservoir.