Contactlessly mounted and driven spinning ring for a spinning unit of a ring spinning machine, and method for controlling the contactlessly mounted and driven spinning ring

Abstract

The invention relates to a spinning unit for a ring spinning machine, for producing a yarn from a fibre composite, comprising, in addition to the conventional components of a spinning unit, a drive comprising a stator and a rotor, wherein the spinning ring is designed as part of the rotor, and the rotor comprises at least one magnet for generating torque and for mounting the spinning ring, and an electronic unit comprising a computing means. The invention is distinguished in that the electronic unit comprises a means for determining the radial force FR acting on the ring traveller by means of a yarn being wound onto the sleeve provided on the spindle. A method for determining the yarn tension FF and a driven spinning ring for use in a spinning unit according to the invention are also disclosed.

Description

[0001] CONTACT-FREE MOUNTED AND DRIVEN SPINNING RING FOR A SPINNING STATION OF A RING SPINNING MACHINE AND METHOD FOR CONTROLLING THE CONTACT-FREE MOUNTED AND DRIVEN SPINNING RING

[0002] TECHNICAL FIELD

[0003] The present invention relates to a spinning station of a ring spinning machine with a contact-free mounted and driven spinning ring with ring traveler, a contact-free mounted and driven spinning ring with ring traveler and a method for controlling the contact-free mounted and driven spinning ring to determine the thread tension acting on the ring traveler.

[0004] TECHNOLOGICAL BACKGROUND

[0005] Spinning stations of ring spinning machines with a contact-free mounted and driven spinning ring, with a fixed or movable ring traveler are state of the art and ensure a reduction of frictional forces and thus a reduction in the size of the thread tension on the thread in the so-called spinning ring-ring traveler system.

[0006] Conventional ring spinning machines are equipped with a spinning ring-ring traveler system for imparting twist to the fiber material (including fiber strands, fiber composites, yarn, and the like) coming from a drafting system and centered in relation to the spindle axis via a yarn guide. As a result of the rotation of the spindle, the ring traveler, into which the fiber material is suspended and which is movably or permanently attached to the spinning ring, is set in rotation and a yarn (or thread) is produced. The ring traveler does not have its own drive, but is carried, pulled, or dragged along by the fiber material suspended in it, which is wound onto the spindle or onto the tube mounted on the spindle. Due to the friction of the ring traveler on the spinning ring, the ring traveler lags behind the speed of the spindle, which leads to the fiber material being wound onto the tube mounted on the spindle.

[0007] The productivity limitation of the ring spinning process lies primarily in the spinning ring-to-ring traveler system and depends on the spinning ring, the ring traveler, and the fiber material. Increasing productivity requires increasing the spindle speed and the fiber material delivery rate from the drafting system, which, due to the friction between the spinning ring and the ring traveler, leads to high tensions in the fiber material or on the ring traveler. Limiting the speed of the ring traveler means that the fiber material delivery rate cannot be increased any further, so the existing spinning ring-to-ring traveler system limits the performance of ring spinning machines.

[0008] It is quite common to use driven spinning rings. Depending on their design, driven spinning rings also experience friction losses due to their bearings, which negatively impacts the spinning ring-ring traveler system and thus the performance of the ring spinning machine. Therefore, non-contact bearing and driven spinning rings are particularly recommended.

[0009] A possible and long-known type of contactless bearing is the air bearing, as shown in DE 1185959. The spinning ring is rotatably mounted in the ring rail. The spinning ring shown here, however, is not driven, which, as described in the prior art statements in DE 1185959, is certainly possible. To regulate the thread tension, braking the spinning ring is proposed, which, among other things, is an eddy current brake formed by electromagnets. This type of braking, once set, remains constant.

[0010] WO 2022 / 137039 shows an alternative, contactlessly mounted and driven ring. The invention disclosed therein relates to a driven spinning ring for a ring spinning machine with an electric drive having a stator and a rotor with a magnet. The ring comprises a ring crown for supporting a ring traveler and a connecting section, and the ring is connected in a rotationally fixed manner to the rotor of the drive via the connecting section. The drive has a coil system for generating torque and radial forces, wherein one axial degree of freedom and both tilting degrees of freedom of the rotor are passively stabilized by reluctance forces, and both radial degrees of freedom are actively stabilized by a control loop. The radial position (x and y directions) and the electrical angle of rotation of the rotor are continuously recorded by sensors.

[0011] The not-yet-published CH 341 / 2022 (OBJ-3562) of March 28, 2022, shows a driven spinning ring whose rotation speed is controlled by a controller. The rotation speed is controlled in such a way that several so-called balloons form between the drafting system and the spinning ring. These balloons contribute to tension relief in the yarn or on the ring traveler.

[0012] Disadvantages of the above-mentioned state-of-the-art solutions are, on the one hand, the need for sensors and, on the other hand, the lack of possibility to influence the thread tension or thread pull force dynamically or continuously.

[0013] The present invention seeks to minimize or eliminate the aforementioned disadvantages, particularly with regard to active control in the sense of dynamic / continuous adjustment of the thread tension or the thread tension on the traveler. In particular, a system is proposed that achieves constant thread tension, thus reducing the risk of thread breakage and enabling operation with minimal thread breakage while maintaining consistently good thread quality. SUMMARY OF THE INVENTION

[0014] The object of the present invention is to provide a spinning station for a ring spinning machine that is optimized compared to the prior art and ensures dynamic / continuous adjustment of the thread tension or the thread tensile force on the ring traveler, thus maintaining a constant thread tension or the thread tensile force on the ring traveler during operation of the spinning station or the ring spinning machine. A corresponding method and a suitable, driven spinning ring are to be demonstrated.

[0015] According to the invention, the object is achieved by an optimized spinning station of a ring spinning machine, a driven spinning ring and a method for determining the thread tension acting on the ring traveler according to the independent patent claims.

[0016] The essence of the invention therefore lies in a spinning station for a ring spinning machine which, for producing a yarn from a fiber strand, has a drafting system for drafting the fiber strand, which comprises at least one pair of output rollers, a spinning ring arranged on a ring rail, and a drive comprising a stator and a rotor, wherein the spinning ring is formed as part of the rotor. The rotor comprises at least one magnet for generating torque and for supporting the spinning ring formed as part of the rotor. The spinning station further comprises a ring traveler which can be placed on the spinning ring, a spindle arranged on a spindle rail, wherein the spindle can be equipped with a sleeve onto which the yarn is wound, and electronics comprising a computing means.The invention is characterized in that the electronics have a means for determining the radial force FR acting on the ring traveler by a yarn to be wound onto the tube mounted on the spindle. The spinning station is a spinning station of a conventional ring spinning machine and has a drafting system with at least one pair of output rollers. In addition, a compacting unit and / or a thread guiding device and / or a balloon constriction ring can be arranged between the drafting system and the part of the ring rail associated with the spinning station or the part of the spindle rail associated with the spinning station, through which the fiber structure (including fiber strand, fiber material, yarn, and the like) is guided, twisted, and centered with respect to the spindle axis. Both the ring rail and the spindle rail generally run along an entire ring spinning machine or a section of a ring spinning machine.In the context of this invention, the term ring rail or spindle rail refers to the section assigned to the respective spinning station.

[0017] The ring rail is equipped with a spinning ring associated with the spinning station, to which a ring traveler can be attached. This traveler is set in rotation by the rotation of the spindle assigned to the work station and by the fiber material suspended in it. Alternatively, the ring traveler is fixedly attached to the spinning ring and is set in rotation by the spindle.

[0018] The driven spinning ring is part of a bearingless motor comprising a rotor and a stator, the rotor having at least one magnet. The spinning ring can be connected to the rotor in a rotationally fixed manner (e.g., via a connecting section) or formed as an integral part thereof.

[0019] The spinning ring is driven by an electric drive, or more precisely, an electromagnetic drive. The spinning ring, connected to the rotor, is suspended in the stator. In this context, this is referred to as an active magnetic bearing. This, especially with electromagnets, requires appropriate control (electronic control). The major advantage of such bearings is that there are no frictional losses due to the drive bearing. The stator can be mounted directly in the ring rail (the area of ​​the ring rail corresponding to the spinning station).

[0020] Additional emergency bearings and / or damping devices can advantageously be provided.

[0021] The stator of the bearingless motor or drive has a coil system, which, in conjunction with the at least one magnet attached to the rotor, is required to generate torque and radial forces. The current supply to the coil system is adjusted by a control system depending on both the radial rotor position and the electrical angle of rotation of the rotor. The bearingless motor can be designed, for example, as a magnetically mounted disc motor.

[0022] The spindle can be fitted with a core, which is wound. Once wound, the core is called a cop. The winding does not have to be completely finished. The spindle for the corresponding spinning station is located on a spindle rail, or more precisely, the section of the spindle rail assigned to the corresponding spinning station. Depending on the design, the spindle drive can be a single-spindle drive (=spindle with its own motor) or a conventional spindle drive (=via a belt).

[0023] The spinning station is also assigned an electronic system comprising a computing device. The electronic system includes a power section and a regulation or control unit. Alternatively, the computing device is located in a central control box of the spinning machine, with the data being transmitted via cable or alternatively wirelessly. The transmission takes place in both directions. Intermediate computing devices which, for example, summarize the data from computing devices of a section of a ring spinning machine or a specific number of spinning stations are not excluded from the invention. The electronic system, in particular the power section of the electronic system, also includes a means for determining the radial force acting on the ring traveler by a yarn to be wound onto the spindle (hereinafter referred to as the means for determining). The radial force is preferably determined continuously.

[0024] Between the ring traveler and the cop, or the more or less wound tube, a yarn tension force FF of the yarn acts on the ring traveler in the ring plane. The yarn tension force FF runs along the yarn path toward the cop, more precisely, to the winding point, where the yarn tension force FF is tangent to the cop diameter (corresponding to twice the winding radius in spinning operations).

[0025] The yarn tension force FF is divided into two components: a radial force FR and a tangential force FT. The radial force FR acts along the x-axis (= in the ring plane from the ring traveler to the center of the spinning ring, which is also the spindle's axis of rotation - provided the spinning ring is correctly aligned) and forms an angle α between itself and the yarn tension force FF. Angle α is therefore dependent on the winding radius. The winding radius can be continuously calculated or determined using a sensor.In addition to changes in the angle a due to the constantly changing winding radius, the angle a also changes for the following reason: if the spinning ring is not exactly in the x-axis (see both tilting degrees of freedom) or if its position changes in relation to the spindle axis, which is usually coaxial with the spinning ring (radial degree of freedom), the angle a and thus the proportion of the radial force component FR in relation to the thread tension force FF changes accordingly.

[0026] The exact position of the spinning ring—which in the context of this invention corresponds to the rotor, since the spinning ring is rotationally fixed to the rotor or is an integral part thereof—with respect to its alignment in the x-axis and with respect to the spindle axis is usually monitored by sensors and corrected if necessary by the drive control. However, such sensors are not necessary in a bearingless motor because if the current demand and the associated temporal change in the current that occurs / is required in the coil system of the electromagnetic bearing / drive of the spinning ring are measured, the exact position of the rotor / spinning ring can be calculated. In other words, the electromagnets used to position the spinning ring can be used as a sensor: the current flowing through the electromagnets depends on the position of the spinning ring.

[0027] The current required to hold the bearing radially in position provides information about the radial force FR. This is determined by a device for determining the radial force FR acting on the ring traveler. The determination is carried out by measurement, other means, or calculation. Furthermore, the determination is preferably carried out continuously.

[0028] The thread tension FF can be calculated using angle a, which is determined using sensors, for example, and which depends on the winding radius or diameter. If this is too great, the bearingless motor is controlled by the control unit in such a way that either the position of the bearing changes to reduce the radial force FR, or the speed of the spinning ring is reduced, which in turn, as described below, influences the tangential force FT, or the spindle drive is controlled in such a way that the spindle speed is reduced. In this way, the information derived from the required current of the bearingless motor is further used to control the bearingless motor itself or the spindle drive. The aim is to keep the thread tension constant and prevent thread breakage.It is conceivable that, in the case of significantly altered spindle speed, the change in the delivery speed of the drafting system can be adjusted in conjunction with the invention. Depending on the design, the regulation / control of the drafting system or the delivery speed can be carried out for each spinning station. For this purpose, a maximum speed change can be specified; upon reaching this maximum speed change, an adjustment of the delivery speed in the drafting system of the respective spinning station becomes necessary.

[0029] The calculations themselves are performed by the electronic computing device. The calculation is preferably continuous. The control unit, in turn, ensures that the current of the corresponding bobbin in the bobbin system is adjusted so that the radial force FR acting on the ring traveler and, as explained later, the tangential force FT, as well as the resulting thread tension, are reduced or increased. Dynamic adjustment is possible: the larger the diameter of the bobbin (corresponding to twice the winding radius), the larger the angle α becomes, whereby the two force components FR and FT of the thread tension FF constantly change. This dynamic adjustment is made possible by the preferably continuous determination of FR and the calculation of FF based on it.

[0030] If, starting from FR and the angle a, the yarn tension FF is known, which in turn is a force component of the force FL that pulls the yarn and thus the ring traveler diagonally upwards, the force FB emanating from the yarn balloon can be determined. FL is the resultant force from the yarn tension FF in the ring plane and the force FB emanating from the yarn balloon, which is applied tangentially to the balloon curve and forms an angle y to the y-axis (corresponds to a line parallel to the spindle axis). Depending on the design, this calculated force is also used to control the current for the bearings and drive of the spinning ring and / or to control the spindle or spindle drive. Advantageously, the drafting system (keyword: delivery speed) can also be controlled accordingly (in relation to delivery speed) by calculating the FB.

[0031] The electronics, in particular the control unit, can also adjust and adapt the damping behavior and stiffness of the bearing. According to an advantageous embodiment of the invention, the electronics of the spinning station of the ring spinning machine comprise a power unit and a control unit.

[0032] Advantageously, the power section of the electronics of the spinning station comprises the means for determining the radial force FR acting on the ring traveler by the yarn to be wound onto the tube applied to the spindle.

[0033] Advantageously, the means for determining the radial force FR acting on the ring traveler by the yarn to be wound onto the tube mounted on the spindle is an ammeter for measuring the current required by the drive to center the spinning ring.

[0034] As already mentioned, the drive functions as an electromagnetic bearing (= bearingless motor) and has the task of driving the spinning ring on the one hand and holding it in position on the other hand, concentrically with respect to both the spinning ring rotation axis and the spindle axis (during operation).

[0035] Since the deflection from the center represents a measure of the force exerted on the rotor, the means for measuring this can be a position measuring device. The position measuring device serves to determine the relative position of the rotor. This measuring device can be used in addition to or instead of the current measuring device.

[0036] Advantageously, the data acquired by the ammeter (measurement data, measured values, current data) are evaluated in the dedicated computing means of the electronics' control unit. For this purpose, the control unit and the power section of the electronics communicate with each other – preferably bidirectionally. The computing means is configured to evaluate the data acquired by the ammeter(s) or the means for determining the radial force FR and / or tangential force FT acting on the ring traveler by a yarn wound onto the tube mounted on the spindle. The current requirement is used to determine a force (FR or FT).Both the current measuring device and, if present, the position measuring device record current or position data (which, in addition to current data, are also to be considered measured values / measured data), which are evaluated in the computing means of the control or regulation unit. As part of this evaluation, a comparison is carried out with previously recorded current and / or position data stored in a database or acquired using machine learning. The resulting delta provides information about the current position (at time t) of the rotor in relation to its six degrees of freedom. The radial degree of freedom and the two tilting degrees of freedom have a particular influence on the thread tension force FF and, in particular, its radial component, namely the radial force FR.

[0037] It is advantageous if the electronics also include a means for determining the tangential force FT acting on the ring traveler due to the yarn being wound onto the tube mounted on the spindle, in particular an ammeter for measuring the current required by the drive to generate torque. This can be the same ammeter.

[0038] As already described, the tangential force FT is the second component of the yarn tension force FF, which can be applied tangentially in the area of ​​the spinning ring (view: ring plane). As with the radial force FR, the calculation is based on the winding radius and the resulting angle α, as well as the yarn tension force FF acting on the ring traveler.

[0039] The tangential force FT is counteracted by the torque of the spinning ring or rotor acting on the ring traveler. The current required to generate the torque must be measured by a means for determining the tangential force FT acting on the ring traveler by the yarn being wound onto the tube mounted on the spindle, such as an ammeter (= means for determining the tangential force FT acting on the ring traveler by the yarn being wound onto the tube mounted on the spindle) or, additionally or alternatively, a position measuring device. The ammeter can be the same as the ammeter used to measure the currents required to determine the radial force FR acting on the ring traveler.The evaluation takes place in the electronics, particularly the control unit, and involves a comparison with previously recorded current and / or position data stored in a database or acquired using machine learning. The resulting delta provides information about the current position (at time t) of the rotor with respect to its six degrees of freedom, with the rotational degree of freedom being important for the tangential force FT.

[0040] It is advantageous if the electronics computing unit is configured to calculate the yarn tension force FF on the ring traveler from the measured values ​​of the current measuring device(s). If available, data (measured values) are also recorded from the position sensor, which is taken into account in the calculation.

[0041] The computing device is a microcontroller. The microcontroller can alternatively be a digital signal processor, an FPGA, an ASIC, or a similar processor.

[0042] It is advantageous if the electronics are configured in such a way that the calculated thread tension / thread tensile force FF is used to regulate or control the bearings and / or drive of the spinning ring and / or spindle. This takes place primarily in the control and regulation unit of the electronics. If an excessively high thread tensile force FF is calculated, which is associated with the risk of thread breakage, the bearings of the spinning ring can be optimized, for example, or the rotation speed of the spinning ring and / or spindle can be reduced. This enables dynamic adjustment of the thread tension / thread tensile force FF during operation to reduce the number of thread breaks and thus increase the efficiency of the spinning station of the ring spinning machine.The essence of the invention is further a driven spinning ring for use at a spinning station according to one of the preceding claims, wherein the driven spinning ring comprises a ring crown for supporting a ring traveler and a connecting section. The connecting section is connected in a rotationally fixed manner to the rotor of the electric drive. The rotationally fixed connection can be force-locked. A driven spinning ring is advantageous because it allows the thread tension / thread tensile force FF to be influenced (by means of regulation or control technology) and dynamically adjusted.

[0043] According to an advantageous embodiment of the invention, the ring traveler is freely running on the ring crown of the ring traveler.

[0044] In a corresponding spinning ring-ring traveler system, in addition to the yarn tension FF, the traveler friction (friction between the ring traveler and the spinning ring) can also be determined. The data relating to the traveler friction is used by the electronics, particularly the control unit, to compensate for the traveler friction or to determine wear depending on the age of the traveler. The traveler friction is compensated by adjusting the yarn tension FF. This is achieved by adjusting the relative speed between the spinning ring and the ring traveler.

[0045] According to a similarly advantageous embodiment of the invention, the ring traveler fix is ​​attached to the ring crown of the ring traveler. The yarn tension FF can be determined in a corresponding spinning ring-ring traveler system.

[0046] The essence of the invention is further a method for determining the thread tension force FF acting on a ring traveler attached to a spinning ring in a ring spinning station according to the invention, comprising the following method steps, namely the determination of the current required by the electric drive for storage or the current required by the electric drive for storage and the drive of the electrically driven and magnetically mounted spinning ring and the evaluation of the determined current, wherein the radial force FR acting on the ring traveler is calculated (determined) by means of the current required for the electromagnetic storage of the spinning ring.

[0047] The determination of the force acting on a ring traveler attached to a spinning ring, where the ring traveler can be fixed or free-running, is based on measured data on the one hand and calculations on the other. Measured data is data from measuring devices such as a current measuring device or the additional position measuring device (e.g. a sensor or three Hall sensors spaced 120 degrees apart). The measured data relates to the current required by the drive for the bearings and to drive the spinning ring. The evaluation of the current includes calculations of the forces acting on the ring traveler. Alternatively, the evaluation of the measured current can provide information about the closure of the ring traveler. The calculation of the forces acting on the ring traveler takes place in the control unit and is advantageously carried out by a computing device.

[0048] Advantageously, the tangential force FT acting on the ring traveler is calculated using the current required to electrically drive the spinning ring. This calculation takes into account the determined or calculated radial force and the winding radius.

[0049] Advantageously, the thread tension force FF is calculated using the determined or calculated radial force FR and tangential force FT. This calculation is based on the relationship FF = FR / cos a or FT = FF x sin a.

[0050] To calculate the thread tension force FF, the winding radius r on the tube mounted on the spindle is taken into account.

[0051] Advantageously, the calculated yarn tension FF is used to adjust at least one operating parameter of the spinning station to increase or decrease the yarn tension FF at the spinning station. This adjustment takes place continuously / dynamically. One example of this is the adjustment of the relative speed between the spinning ring and the ring traveler, for example by adjusting the rotational speed of the driven spinning ring. Operating parameters that can influence the yarn tension at the spinning station include the position of the spinning ring in the ring plane and the rotational speed of the spinning ring, the rotational speed of the spindle or tube, the delivery speed of the drafting system, in particular the output roller pair of the drafting system, and the condition of the ring traveler in the form of an indication that the ring traveler needs to be replaced. The position of the ring rail relative to the winding point on the cop also has an influence.However, the most important factors are the position and rotation speed of the spinning ring.

[0052] BRIEF EXPLANATIONS OF THE FIGURES

[0053] Further advantages of the invention are described in the following exemplary embodiments. They show, schematically:

[0054] Figure 1 shows a spinning station of a ring spinning machine;

[0055] Figure 2 shows a section of an embodiment of the drive element according to the invention;

[0056] Figure 3 is a three-dimensional representation of an embodiment of the drive element according to the invention with a view of the second annular base surface;

[0057] Figure 4 Force ratios on the ring traveler in the ring plane;

[0058] Figure 5 the degrees of freedom of the rotor

[0059] Figure 6 shows a spinning station according to the invention with an electronic

[0060] DESCRIPTION OF THE CHARACTERS

[0061] Figure 1 schematically shows a spinning station of a ring spinning machine with a drafting unit for drafting the fiber material, a thread guide device 11, a portion of a ring rail 5 assigned to the spinning station shown, with a spinning ring 1 located thereon. The spinning ring 1 is driven, which is not clearly evident from Figure 1, but is sufficient for the schematic representation. The spinning ring 1 comprises a ring crown 3, to which a ring traveler 2 can be attached (movably or permanently). The spindle 8 is mounted on a portion of a spindle rail 7 assigned to the spinning station shown, and can be operated individually or conventionally via a belt (spindle drive 6). The yarn or thread path 10 from the drafting unit 12 to the tube or cop 9 located on the spindle 8 can be seen from Figure 1.A so-called balloon 10' is formed between the drafting unit 12 and the ring traveler 2.

[0062] Figure 2 shows a plan view of the portion of a ring rail 5 assigned to a spinning station, with a driven spinning ring 1 fastened therein according to one embodiment of the invention. The stator 14 is fastened to the ring rail 5, for example, by means of fastening elements (not shown) or integrated therein. The stator 14 shown as an example is housed in a square housing and is fixedly fastened to the ring rail 5. A rotor 13 is arranged within the stator 14, wherein the stator 14 and the rotor 13 together form a drive, namely a bearingless motor. A magnet (not visible here) is connected to the rotor 13. The stator 14 and the rotor 13 are arranged concentrically around an axis of rotation (hereinafter 22) of the spinning ring 1. The spinning ring 1 itself, likewise concentrically aligned, is fixedly fastened to the rotor 13.The spinning ring 1 has a ring crown 3, to which a ring traveler 2 can be fixedly or freely movable. Figure 2 shows the force ratios on the ring traveler 2. A thread tensile force FF acts, which can be divided into the radial force FR and the radial force FT. The thread tensile force FF and the radial force FR enclose an angle α, which depends on the winding radius of the tube or cop (not shown here). If the radial force FR was determined according to the invention via the current required to support the rotor 13 or the spinning ring 1 attached to it, and if the angle α is known, the thread tensile force FF can be calculated based on the following relationship: FR = FF x cos α.

[0063] Figure 3 shows a schematic representation of a driven spinning ring 1 according to an embodiment of the invention. Shown are the rotor 13 with magnets 15 and the stator 14 arranged around the rotor 13. A spinning ring 1 with a ring crown 3 and a connecting section 4 is mounted on the rotor 13. The spinning ring 1 is fixedly connected to the rotor 13 via the connecting section 4. A ring traveler 2 is fixedly attached to the ring crown 3. As a result, the rotor 13 is set in rotation, and the spinning ring 1 and the ring traveler 2 are also set in rotation by the rotor 13. In contrast to the illustration in Figure 2, the ring traveler 2 is not freely movable on the ring crown 3, but always has the same speed (around the rotation axis 22) as the spinning ring 1 or the rotor 13.

[0064] According to one embodiment of the invention, a position measuring device 26 is additionally located in the stator 14. This position measuring device 26 consists, for example, of three Hall sensors positioned at a distance of 120 degrees each.

[0065] A current measuring device (not shown) is located, for example, in the power electronics.

[0066] Figure 4 again schematically shows the force ratio on the ring traveler 2. In addition to the spinning ring 1 and the attached (fixed or freely movable) ring traveler 2, the tube or cop 9 onto which the thread or yarn is wound is schematically shown. Figure 4 shows the relationship between the winding radius r and the angle a, which is enclosed by the thread tension force FF and the radial force FR and is used to calculate the thread tension force FF.

[0067] Figure 5 shows a schematic representation of the six degrees of freedom of movement on the rotor 13, which are controlled either by the drive (rotor / stator) or by the electromagnetic bearing. The rotor 13 is shown as a cylindrical ring. The rotor 13 rotates around the axis of rotation 22, with the rotation corresponding to the rotational degree of freedom 17 and the translational movement along the axis of rotation corresponding to the axial degree of freedom 16. Further translational movements are indicated along the x-axis 23 and the z-axis 24 with the two radial degrees of freedom 20 and 21. The two rotational movements around 20 and 21 are indicated as tilting degrees of freedom 18 and 19. For all directional information in Figure 5, the directional information also includes an indication of an opposite direction. The rotation around the axis of rotation 22 is controlled by the drive. The remaining 5 degrees of freedom are controlled via the bearing.

[0068] Fig. 6 shows a schematic view of a spinning station, which includes electronics 27. The electronics 27 comprise a power section 30 and a control or regulation unit 31, wherein the control or regulation unit 31 contains a computing means 28 and the power section 30 comprises a means for determining the radial force FR 29 acting on the ring traveler 2 by a yarn to be wound onto the tube 9 mounted on the spindle 8. The arrow indicates the mutual communication between the components of the power section 30 and the control or regulation unit 31. The spinning station also includes a spindle 8 and a driven spinning ring 1 comprising a rotor 13 and stator 14, wherein the rotor 13 is connected to a spinning ring 1.The dashed arrow between the drive (constructed as rotor 13 and stator 14) and the electronics 27 symbolizes the communication between the drive 13 / 14 and the electronics 27 and the components it comprises, such as the computing means 28 and means for detecting the radial force FR 29 acting on the ring traveler by a yarn to be wound onto the sleeve applied to the spindle 8.

[0069] The present invention is not limited to the illustrated and described embodiments. Modifications within the scope of the patent claims are possible, as is any combination of the described features, even if they are illustrated and described in different parts of the description or the claims or in different embodiments, provided that no contradiction arises with the teaching of the independent claims.

Claims

PATENT CLAIMS 1. Spinning station for a ring spinning machine, for producing a yarn from a fiber structure comprising - a drafting device for drawing the fiber structure, wherein the drafting device comprises at least one pair of output rollers; - a spinning ring (1) arranged on a ring rail (5); a drive comprising a stator (14) and a rotor (13), wherein the spinning ring (1) is formed as part of the rotor (13) and the rotor (13) comprises at least one magnet (15) for generating torque and for supporting the spinning ring (1) formed as part of the rotor (13); a ring traveler (2) which can be placed on the spinning ring (1); - a spindle (8) arranged on a spindle bank (7), wherein the Spindle (8) can be equipped with a sleeve (9) onto which the yarn is wound; and - an electronic system (27) comprising a computing means (28), characterized in that the electronic system (27) comprises a means for determining the radial force (FR) (29) acting on the ring traveler (2) by a yarn to be wound onto the sleeve (9) applied to the spindle (8).

2. Spinning station according to claim 1, characterized in that the electronics comprises a power unit (30) and a control or regulating unit (31).

3. Spinning station according to claim 2, characterized in that the power part (30) comprises the means for determining the radial force (FR) (29) acting on the ring traveler (2) by the yarn to be wound onto the sleeve (9) applied to the spindle (8).

4. Spinning station according to claim 1, characterized in that the means for determining the speed of rotation of the spindle (8) The radial force (FR) (29) acting on the ring traveler (2) by the yarn to be wound onto the sleeve (9) is, in particular, an ammeter for measuring the current required by the drive to center the spinning ring (1).

5. Spinning station according to claim 3, characterized in that the current data recorded by the current measuring device (29) are evaluated in the computing means (28).

6. Spinning station according to a preceding claim, characterized in that the power part (30) additionally comprises a means for determining the tangential force (FT) acting on the ring traveler by the yarn to be wound onto the sleeve (9) applied to the spindle (8), in particular an ammeter for measuring the current required by the drive to generate a torque.

7. Spinning station according to claims 4-6, characterized in that the computing means (28) is configured such that it calculates a thread tension force (FF) from the measured values ​​of the current measuring device(s).

8. Spinning station according to one of the preceding claims, characterized in that the computing means (28) is a microcontroller.

9. Spinning station according to one of claims 7 or 8, characterized in that the electronics (27) are configured such that the calculated thread tension force (FF) serves to regulate or control the bearing and / or the drive of the spinning ring (1) and / or the spindle (8).

10. Driven spinning ring (1) for use at a spinning station according to one of the preceding claims, comprising a ring crown (3) for supporting a ring traveler (2) and a Connecting section (4), characterized in that the connecting section is rotationally connected to the rotor (13) of the electric drive.

11. Driven spinning ring (1) according to claim 10, characterized in that the ring traveler (2) is freely running on the ring crown (3) of the ring traveler (2).

12. Driven spinning ring (1) according to claim 10, characterized in that the ring traveler (2) is fixedly attached to the ring crown (3) of the ring traveler (2).

13. A method for determining the thread tension (FF) acting on a ring traveler (2) attached to a spinning ring (1) in a spinning station of a ring spinning machine according to claims 1 - 9, comprising the following method steps: determining the current required by the electrical drive for bearing or the current required by the electrical drive for bearing and driving the electrically driven and magnetically mounted spinning ring (1); and evaluating the determined current, wherein the radial force (FR) acting on the ring traveler (2) is calculated by means of the current required for the electromagnetic mounting of the spinning ring (1).

14. Method according to claim 13, characterized in that the tangential force (FT) acting on the ring traveler (2) is calculated by means of the current required for the electrical drive of the spinning ring (1).

15. Method according to claim 14, characterized in that the thread tension (FF) is calculated by means of the determined radial and tangential force (FR, FT).

16. Method according to claim 15, characterized in that the winding radius (r) on the sleeve (9) mounted on the spindle (8) is taken into account for calculating the thread tension force (FF).

17. Method according to one of claims 13 and 14, wherein the calculated thread tension (FF) is used to adapt at least one operating parameter of the spinning station to increase or decrease the thread tension (FF) at the spinning station.

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