The invention relates to a method of driving a mechanical element comprising a yarn catch adapted to catch yarn on a textile machine, in particular on a device for compensating for a yarn loop, on a device for winding yarn on a bobbin or for unwinding yarn from the bobbin, on a device for forming a yarn reserve, on a device for handling yarn on a textile machine in which the mechanical element is acted upon in a controlled manner by a force which allows a targeted change in the position of the mechanical element with the yarn catch and as the yarn is caught by the yarn catch, also the position and/or direction and/or travel path and/or tension of the yarn are changed by the movement of the mechanical element.

The invention also relates to a device moving yarn on a textile machine, in particular a device for handling yarn on a textile machine over long distances, a device for winding yarn on a rotary storage device of yarn or for unwinding yarn from the rotary storage device of yarn, a device for forming a yarn reserve, a device for compensating for a yarn loop on a textile machine, which comprises a mechanical element provided with a yarn catch, the mechanical element being coupled to a drive which is coupled to a control device.

In addition, the invention relates to a textile machine producing or processing yarn and comprising a mechanical element with a yarn catch.

Background art

On a textile machine, it is necessary to move yarn during different operational phases and in different places in the desired manner.

For example, when winding yarn on a cross-wound bobbin on a textile machine at a constant speed of yarn being produced, e.g., on a rotor or air-jet spinning machine, the yarn is periodically slackened and a yarn loop is formed.

The yarn loop is formed due to traversing the yarn across the bobbin width and/or it is caused by different diameters of the two ends of the bobbin when winding yam on a conical bobbin.

Due to the yam loop formation or the slackening of the yarn, considering the constant speed of the yarn production and the constant speed of drawing-off the yarn from a spinning unit, it is necessary to compensate for this slackening of the yarn by periodic lengthening and shortening the length of the yarn travel path between a draw-off mechanism and a yarn winding device. For this purpose, various compensators are used, which include a compensating arm which by one of its ends acts upon the yam and thus in a desired manner extends or shortens the working path of the yam at a workstation in the relevant section between the draw-off mechanism of yam and the yarn winding device. At the same time, the compensator helps maintain a stable yarn tension, which is necessary for the correct winding of the yarn on a bobbin. When restarting the yarn production process at the workstation of the textile machine after the yarn production has been interrupted, for example, after a yarn break or during the exchange of a fully wound bobbin for an empty tube, and when starting to wind a new bobbin, it is necessary to coordinate the start-up of the operation of the yam loop compensator with terminating the yarn withdrawal from an intermediate storage device of yarn so as to effectively eliminate the above- mentioned yam loop and maintain a constant tension of the yarn being wound. During the standard winding process, it is necessary to maintain the tension in the yam within the desired range to form a high-quality yam package. In these processes, a swinging arm is deflected due to the action of various passive or active forces. The passive force can be exerted, for example, by pre-loading the flexible arm of the compensator, or by a resilient outer member acting on a swinging or sliding catching system, or it can be induced by a magnetic field of a permanent magnet acting on the rotating arm of the compensator. The active force acting on the swinging or sliding catching system can be induced, for example, by the action of the magnetic field generated by the electromagnet. During the working or attending operations on textile machines, it is necessary to perform also other activities and manipulations or movements with yarn at workstations of textile machines and service robots of textile machines, such as forming a yarn reserve, consuming the yarn reserve, performing handling operations with a yarn end or with a certain section of yarn or a certain length of yarn, etc. For performing such operations, mechanical elements with a yarn catch are used, wherein these mechanical elements are driven by rotary or linear electric or pneumatic motors, optionally combined with mechanical gears, lever or cam members, etc. The disadvantage of these devices is the need to use an additional drive, which increases the complexity of the device, makes it difficult to achieve the desired path of movement of the mechanical element moving the yarn, the force acting of the types of motors used, as well as cost of these drives. Various solutions of spring and magnetic active compensators are known, for example, according to CZ 281 250 B6 and CZ 305 860 B6. The compensators thus designed have numerous advantages, especially in terms of the reaction speed and relatively large range of the swinging motion of the compensating arm. However, there some drawbacks, e.g. in terms of changes in the magnitude of the compensating force of the working arm, e.g., for spinning thicker yarn, when it is necessary to exert a higher compensating force to eliminate a yarn loop, etc. Greater force action on the yarn is also necessary, for example, when moving the compensating arm or the moving member in the event of transient states outside the working range of the compensating unit during the performance of service activities at a spinning station, etc. Another disadvantage of these compensators is a limited path of the compensating arm stroke or a limited path of the mechanical element moving the yarn. With the requirement to increase the compensating force and to increase the path of the compensating arm or that of the mechanical element moving the yarn, the size of the compensator and the problem with its placement in a limited space of a textile machine, e.g. the spinning station, also increase. This then does not allow to preserve the simplicity of construction, ease and speed of adjustment of the individual parts and of the entire device.

The aim of the invention is therefore to eliminate or at least reduce the disadvantages of the background art. Principle of the invention

The object of the invention is achieved by a method of driving a mechanical element moving yarn, whose principle consists in that it is the force of a compressed gaseous medium fed to at least one outlet (nozzle) associated with a mechanical element with a yarn catch that is used to drive or to position a compensating sliding or swinging member, whereby the compressed gaseous medium emerges in a controlled manner and generates a reactive force F which causes the movement of the mechanical element with the yarn catch. The force action of the compressed gaseous medium fed to at least two outlets according to the invention can be used in a preferred embodiment also at a spinning station of spinning machines to produce a yarn reserve in a storage device of yarn before the resumption of spinning, or in other textile machines for moving a yarn end during the production process, or in service robots of spinning machines when handling a yarn end. In another preferred embodiment, it is possible to use a single outlet from which the compressed gaseous medium emerges and expands, thus creating a reactive force against the gravitational force acting on the mechanical element, thereby deflecting the mechanical element from the rest position, simultaneously with the yarn catch, which then carries the yarn in the desired direction. In another embodiment, the gravitational force is replaced with the force action of a flexible member which keeps the mechanical element in the rest position and acts against the reactive force of the stream of the gaseous medium emerging from the outlet. In yet another preferred embodiment, the stream of compressed gaseous medium emerging from the outlet arranged on the mechanical element is directed against the surface formed by a stationary member - a barrier, thereby improving the effect of the compressed gaseous medium on the mechanical element. The barrier is arranged individually or in a group one after the other along the shape path of a shaped guide of the mechanical element, and their functional surfaces are oriented perpendicular or oblique to the longitudinal axis of the path of the path of the shaped guide, whereby the shaped guide can be made in the form of a straight line, a curve or a circle. The barrier/the barriers can be preferably arranged also on the shaped guide of the mechanical element. The outlet is arranged on a stationary member and the stream of the compressed gaseous medium emerges and expands and acts on a swinging arm carrying yarn, or on the barriers around the periphery of a rotatably mounted member which is set in rotation, and along with it, also a yarn drum of a yarn storage device arranged thereon on which the yarn is wound is set in rotation.

In addition, the object of the invention is achieved by a device for performing it. It is advantageous to use more than one outlet for the force action in the device, at least one outlet exerting a force in one direction and the other outlet acting in the opposite direction. It is advantageous to use an outlet which is mounted adjustably in a directionally controlled manner, thereby allowing a change in the direction of the emerging gaseous medium and its action on a sliding mechanical element, and thus the movement of the mechanical element along the guide in the forward or reverse direction can be induced by one outlet. Furthermore, in order to control the magnitude of the force action, or the direction of the action, or to change the magnitude/direction of the force action during the change of the position of the mechanical element, it is advantageous to use a control device to change the pressure and the amount of the compressed gaseous medium. In this case, the control device controls the change in the magnitude of the pressure of the compressed gaseous medium so that the effect of the reactive force can be continuous or pulsed, or it can be modulated over time. Moreover, so as to control the magnitude of the force action or the direction of the action, it is advantageous to use different outlets with different flow cross-sections, or use a different number of them, or change the cross-section of the outlet in a controlled manner. The principle of the device for performing the method according to the invention consists in that the mechanical element is associated with at least one directional outlet of compressed gaseous medium which is via the control device connected to a source of the compressed gaseous medium. This allows to use the force action (i.e. the acting of the force) of the compressed gaseous medium which is fed to at least two outlets to drive or position the mechanical element of a yarn loop compensator, a yarn storage device or a yarn handling device, or to use the force of the emerging the stream of the compressed gaseous medium acting on the surface/surfaces of a stationary or movable member which is mounted slidable, swinging or rotatable. The control of the speed and force action on the yarn is preferably performed by a control unit of the compressed gaseous medium.

The principle of a textile machine producing or processing yarn and comprising a mechanical element with a yarn catch consists in that this machine has a device for moving yarn according to any of claims 7 to 18.

The advantage of the present invention is the fact that using the force action of the compressed gaseous medium which is fed to the at least two outlets for driving or positioning the mechanical element or using the force of the stream of the compressed gaseous medium acting on the surface/surfaces of the stationary barriers or of the movable mechanical members allows to develop a greater control force or to obtain a longer path of the compensating member, of the mechanical element of the yarn storage device or the yarn handling device, while minimizing the dimensions of these devices and solving the problem of placing them within the limited space of the spinning station. Another advantage is the simplicity of the device design and low acquisition costs.

Description of the drawings The present invention is schematically represented in the drawings, wherein Fig. 1a shows an arrangement of a yarn loop compensator with a mechanical element moving yarn in non-working position, Fig. 1b shows an arrangement of the compensator with the mechanical element moving yarn during yarn loop compensation, Figs. 1c, 1 d and 1e show an arrangement of the yarn loop compensator with the mechanical element moving yarn and with differently oriented barriers, Fig. 2 shows an arrangement of a yarn handling device with the mechanical element moving yarn, Fig. 3a shows an arrangement of the mechanical element moving yarn at a vacuum storage device of yarn during yarn reserve formation, Fig. 3b represents an arrangement of the yarn handling device with the mechanical element moving yarn at the vacuum storage device of yarn when transferring the yarn reserve to the vacuum storage device of yarn, Figs. 4a, 4b, 4c, 4d, 4e, 4f show an arrangement of the mechanical element moving yarn in the form of a swinging yarn loop compensator, Figs. 5a, 5b, 5c, 5d, 5e show an arrangement of the mechanical element on a rotary storage device of yarn.

Examples of embodiment

The present invention will be described with reference to exemplary embodiments and functioning of a mechanical element moving yarn on a textile spinning machine producing yarn.

A yarn producing spinning machine comprises at least one row of identical spinning stations arranged next to each other.

The spinning station is well known in principle, and therefore it will be described here as a whole only in a simplified manner without a figure. Those parts, elements and assemblies of the workstation which are important for the present invention will be described in more detail.

Each workstation comprises a spinning unit 12 with a spinning rotor or a spinning nozzle. Yarn 11. is formed in the spinning unit 12. Downstream of the spinning unit 12 is arranged a draw-off mechanism 13 of yarn 11 which comprises a pair of draw-off rollers which are rotatably mounted in the machine structure, whereby one of the draw-off rollers is coupled to a drive (not shown) to constitute a driven draw-off roller. The other draw-off roller is rotatably mounted on a swinging spring-loaded arm and constitutes a pressure draw-off roller. The two draw-off rollers thus lie on top of one another in the working position; at the point of their contact there is a nip line through which the yarn 11. passes, the yarn being thus drawn off from the spinning unit 12 due to the rotation of the draw-off rollers. A yarn winding device 14 which winds yarn on a cross-wound bobbin is arranged in the path of yarn downstream of the draw-off mechanism 13. The yarn winding device 14 includes a yarn 11 traversing device by which yarn 11 is traversed across the bobbin width during winding. Between the draw-off mechanism 13 and the traversing device of yarn 11, a compensator of a yarn 11. loop is arranged at the workstation in the yarn 11. path. The yarn 11. loop compensator comprises a yarn catch 8 which intersects the path of the yarn 11 and is mounted on a mechanical element 1. The mechanical element 1 is mounted to be reciprocally slidable in the direction of the arrows 16, 23 on a guide 2 which has a starting point 21. and an end point 7. Along the guide 2, position sensors 10 of the mechanical element 1 moving the yarn 11. on the guide 2_are arranged. The yarn catch 8 comprises, for example, a hook, a clamp, a gripping arm, etc. The mechanical element 1 is provided with at least one intake of compressed gaseous medium, e.g. compressed air, and at least two outlets 5, 6 of compressed gaseous medium, the two outlets being situated in opposite directions (Figs. 1 a, 1 b) or in approximately opposite directions (Fig. 1 c). In the embodiment shown, the mechanical element 1 is provided with two outlets 5, 6 of the compressed gaseous medium which are situated in opposite directions (Figs. 1 a, 1 b) or in approximately opposite directions (Fig. 1 c), each of the two outlets 5, 6 being connected to one intake 3, 4 of the compressed gaseous medium.

The intakes of the compressed gaseous medium are, for example, made as flexible intake hoses, thereby limiting the resistive force action of the hoses (intakes 3, 4) on the mechanical element 1 due to the deformation stiffness of these intake hoses during their deformation by the movement of the mechanical element 1.

The outlets 5 and 6 are oriented such that the reactive forces F or their components caused by the exit of the compressed pressure medium from the outlets 5 and 6 act counterclockwise in the longitudinal axis of the guide 2, causing the desired movement of the mechanical element 1. Along the yarn 11 working path, yarn guide elements 9 are arranged on both sides next to the yarn catch 8 and in the vicinity of the starting point 21 of the guide 2. Furthermore, in the yarn 11 working path, an intake 17 of an (vacuum) intermediate storage device 20 of yarn 11. is arranged in the region between the yarn 11 draw-off mechanism 13 and the yarn 11 winding device 14. In the vicinity of the intake 17 of the (vacuum) intermediate storage device 20 of yarn 11, along the yarn 11. path, are arranged guide elements 18, 19 of yarn 11, whereby the first guide element 18 is arranged laterally before the intake 17 in the direction of the movement of the wound yarn 11 to the winding device 14 and the second guide element 19 is laterally arranged behind the intake 17 of the (vacuum) intermediate storage device 20 of yarn 11. in the direction of the movement of the yarn 11 being wound to the winding device 14. In the example of embodiment shown in Fig. 2, the guide is made as curved, i.e. in the form of a curve, and is provided with a starting point 21 and an end point 7, which are situated at the spinning station of the machine in a position required for moving the yarn 11 along the shape path of the curved guide 2. The mechanical element 1 is provided with the yarn catch 8, e.g. a clamp, a collet, etc. The guide element 9 of yarn 11 is arranged at the starting point 21. The mechanical element 1 is provided with at least one intake of compressed gaseous medium, e.g., compressed air, and with at least two oppositely arranged outlets 5 6 of the compressed gaseous medium being supplied.

According to the exemplary embodiment shown in Fig. 1a and 1b, where Fig. 1a schematically represents a part of the spinning station with the compensator 15 of the yarn 11. loop in a state before restarting yarn 11 production after interrupting production, when the yarn 11. is reintroduced into the spinning unit 12, whereby it passes between the draw-off rollers of the draw- off mechanism 13 and is guided to the winding device 14, passing by the yarn catch 8 on the mechanical element 1 of the compensator 15 of the yarn 11. loop which has been moved to the starting point 21. of the guide. This device operates in such a manner that the compressed gaseous medium is fed into the outlets 5, 6 in a controlled manner. The compressed gaseous medium flows out through the respective outlet 5, 6, whereby a reactive force F acts on the mechanical element 1. in the opposite direction to the flow direction of the compressed gaseous medium from the respective outlet 5, 6 and the mechanical element 1. of the compensator 15 moves in this direction of the reactive force F at the desired speed. As a result, the mechanical element 1 of the compensator 15 moves in both directions with the yarn catch 8 and with the yarn 11 caught by the yarn catch 8. Fig. 1a shows a situation when the mechanical element 1 has been moved to the starting point 21 of the guide 2, in which the yarn 11 in its working path passes between the mechanical element 1 and the yarn contact portion of the yarn catch 8, the yarn catch 8 being out of contact with the yarn 11 and therefore has no effect on the yarn 11.

The effect of the reactive force F is increased by an arrangement of the mechanical element 1 of the compensator 15 of the yarn 11 loop shown in Fig. 1c, where the compressed gaseous medium emerging from the outlets 5, 6 flows onto the functional surfaces of barriers 31 arranged at a distance from each other along the guide 2 in a direction perpendicular to the longitudinal axis of the guide 2, or the barriers 32, 33 are arranged with their functional surfaces in a direction oblique to the longitudinal axis of the guide 2, whereby the barriers 32 shown in Fig. 1d serve to move the mechanical element 1 in the direction from the starting point 21 to the end point 7 of the guide 2 and the barriers 33 in Fig. 1e serve to move the mechanical element 1 in the direction from the end point 7 to the starting point 21 of the guide 2. The barriers 31, 32, or 33 are arranged along the shape path of the shaped guide 2 of the device for handling a yarn 11 end shown in the exemplary arrangement in Fig. 2.

Fig. 1b shows a situation during the compensation of the yarn 11 loop, when the yarn 11 is drawn off by the draw-off mechanism 13 from the spinning unit 12 and wound by the winding device 14 on the bobbin. During the compensation for the yarn 11 loop, the intake of compressed gaseous medium, e.g. compressed air, to the respective outlet 5, 6 is controlled by a control unit (not shown). The reactive force F induced by the stream of the compressed gaseous medium from the respective outlet 5, 6 acts upon the mechanical element 1 of the compensator 15 and deflects it in the direction of the arrow 16 or 23 along with the yarn catch 8 in the direction of the guide 2, whereby the yarn catch 8 exerts a force on the yarn 11 and deflects it from its straight path, which on the one hand maintains a constant tension in the wound yarn 11 and compensates for the emerging and disappearing loop of the yarn 11. By controlling the intake of the compressed gaseous medium, e.g. compressed air, to the respective outlet 5, 6 the direction, speed and force of the yarn catch 8 on the mechanical element 1 acting on the yarn 11 is controlled, when also the control of the intake of compressed gaseous medium simultaneously to the counter outlets 5, 6 is optionally applied, e.g. with different flow through the respective outlets 5, 6, intermittent intake to one of the outlets 5, 6 or different intermittent intake to both outlets 5, 6, etc., thereby, for example, not only controlling the movement and direction, but also decelerating the movement of the mechanical element 1, reversing the direction of the movement of the mechanical element 1, etc. The position of the mechanical element 1 is sensed, for example, by position sensors 10 and the information on the position of the mechanical element 1 is passed to the control unit (not shown), e.g. the control unit of the spinning station which controls the compensator 15.

The exemplary embodiment shown in Fig. 2 is arranged on a textile machine or a service robot, in which the end of the yarn 11 or, in general, any section of the yarn 11 is handled during the work operation, in which the yarn 11 moves from one initial position to another position, or from one working node to another working node. In the exemplary embodiment of Fig. 2, the yarn 11 is moved by the movement of the mechanical element 1 along the shape path of the shaped guide 2 from the starting point 21 of the guide 2 to the end point 7 of the guide 2. In principle, this embodiment works in the same way as the embodiment shown in Fig. 1, whereby the displacement of the mechanical element 1 is induced by the reactive force F exerted by the stream of the compressed gaseous medium from the respective outlet 5, 6. In the embodiment shown in Figs. 3a and 3b, the device operates in such a manner that, e.g., when unwinding the wound yarn 11 from the bobbin at the spinning station of the spinning machine during a service operation, as shown in Fig. 3a, the yarn 11 is caught at the starting point 21 by the yarn 8 on the mechanical element 1, by the movement of which caused by the reactive force F of the compressed gaseous medium flowing out of the respective outlet 5, 6 the yarn 11 is deflected in a controlled manner, thereby forming a reserve of yarn 11 which can be afterwards moved to the intermediate vacuum storage device 20 by the reciprocal movement of the mechanical element 1, as is shown in Fig. 3b. Fig. 4a shows an embodiment of a swinging arm compensator of the yarn 11 loop which comprises a swinging arm 30 which is at the free end provided with a yarn catch 8. Opposite the arm 30 is arranged an outlet 5 which is connected to the intake 3 of the compressed gaseous medium and which is directed to the arm 30 or to the impact surface of a plate 29 mounted on the arm 30. The device shown in Fig. 4a operates in such a manner that during the compensation for the yarn 11 loop, the stream of the compressed gaseous medium emerges from the outlet 5 arranged on a stationary mechanical member 1a in the direction of the arrow 22, and impinges upon the surface 29 on the arm 30 of the compensator 15, thereby exerting a force on this arm 30. The arm 30 of the compensator 15 is due to this force deflected from the outlet 5 in the direction of the arrow 26 and the yarn 11. is carried and tightened by the yarn catch 8. The stream of the compressed gaseous medium from the outlet 5, as well as the force of the yarn catch 8 acting on the yarn 11, is controlled by an control device (not shown). In the direction opposite to the action of the compressed gaseous medium from the outlet 5, i.e., against the arrow 26, the arm 30 swings by the action of the yarn 11. tension behind the yarn catch 8.

Fig. 4b shows an embodiment of the swinging arm compensator of Fig. 4a, wherein on the opposite side of the arm 30, opposite to the outlet 5 located on the stationary mechanical member 1a, an outlet 6 is arranged on the stationary mechanical member 1b, which is connected to the intake 4 of the compressed gaseous medium, which emerges from the outlet 6 and exerts a force on the surface of the plate 29 arranged on the arm 30 in the direction of the arrow 34, thus acting against the stream of the compressed gaseous medium from the outlet 5. The pressure and period of time of the action of the stream of the compressed gaseous medium from the outlet 5, 6 is controlled by the control device (not shown), by which also the total force of the yarn catch 8 acting on the yarn 11. is controlled. Fig. 4c shows an exemplary embodiment of the arm compensator in which the arm 30 is caught on a rotary drum 35 onto whose roughened peripheral surface flows the compressed gaseous medium emerging in the direction of the arrow 22 from at least one outlet 5 of the stationary mechanical element 1a to which the compressed gaseous medium is fed through the intake 3. By the action of the stream of the compressed gaseous medium, the drum 35 is deflected in the direction of the arrow 26 and, along with it, is deflected also the arm 30 acting with the yarn catch 8 on the yarn 11. during the compensation for the yarn 11. loop at the spinning station of the spinning machine during the winding of the yarn 11 on the bobbin. In another exemplary embodiment in Fig. 4d, the outer peripheral surface of the rotary drum 35 is provided with barriers

27 which increase the force of the stream of the compressed gaseous medium acting on the drum 35. Fig. 4e shows an exemplary embodiment of the arm compensator in which the arm 30 is caught on the rotary drum 35, in which a movable mechanical member 1c is arranged. Compressed gaseous medium emerges from at least one outlet of the movable mechanical member 1c and expands in the direction of the arrow 34. The compressed gaseous medium is fed through the intake 4. The reactive force F exerted by the stream of compressed gaseous medium deflects the drum 35 in the direction of the arrow 26 and the arm 30 caught thereon by the yarn catch 8 on the yarn 11 during the compensation for the yarn 11 loop at the spinning station of the spinning machine during the winding of the yarn 11 on the bobbin. In another exemplary embodiment in Fig. 4f, stationary barriers 31 are arranged along the outer peripheral surface of the drum 35. The barriers 31 increase the force of the stream of the compressed gaseous medium acting on the drum 35. In the exemplary embodiments shown in Figs. 4c, 4d, 4e and 4f, the stream of the compressed gaseous medium from the outlet 5, 6 is controlled by the control device (not shown), by which also the force of the yarn catch 8 acting on the yarn 11 is controlled. In the direction of the action of the compressed gaseous medium from the outlet 5, 6, i.e., against the arrow 26, the arm 30 swings by the action of the yarn 11 tension behind the yarn catch 8. Fig. 5a shows an exemplary embodiment of a rotary storage device of yarn 11 with a rotary drum 28, onto whose roughened peripheral surface flows the compressed gaseous medium emerging from at least one outlet 5 of the stationary mechanical element 1a in the direction of the arrow 22, and into which the compressed gaseous medium is fed through the intake 3. By the action of the stream of the compressed gaseous medium exerting a reactive force F, the drum 28 of the rotary storage device of yarn is rotated in the direction of the arrow 26 and the yarn 11 is wound on the rotary storage device. In another exemplary embodiment in Fig. 5b, the outer peripheral surface of the rotary drum 28 is provided with barriers 27, which increase the force of the stream of the compressed gaseous medium acting on the rotary drum 28.

Fig. 5c shows an exemplary embodiment of the rotary storage device of yarn 11 with the rotary drum 28, on which the movable mechanical member 1c is arranged. Compressed gaseous medium emerges from at least one outlet 6 of the movable mechanical member 1c and expands in the direction of the arrow 34. The compressed gaseous medium is fed through the intake 4. Due to the action of the stream of the compressed gaseous medium exerting the reactive force F, the drum 28 of the rotary storage device of yarn is rotated in the direction of the arrow 26 and the yarn 11 is wound on the rotary storage device of yarn. In another exemplary embodiment shown in Fig. 5d, the stationary barriers 31 are arranged at a distance from the outlet 6 in a circle with a centre on the axis of the rotary drum 28. The barriers 31 increase the force of the stream of the compressed gaseous medium acting on the drum 28. In another exemplary embodiment shown in Fig. 5e, a circular shell is arranged at a distance from the outlet 6 with a centre in the axis of the drum 28, against whose inner wall emerges the stream of the compressed gaseous medium from the outlet 6, thereby increasing the force of the stream of the compressed gaseous medium acting on the rotary drum 28. In the exemplary embodiments shown in Figs. 5a, 5b, 5c, 5d and 5e, the stream of the compressed gaseous medium from the outlet 5, 6 is controlled by the control device (not shown), by which means the force acting on the rotary drum 28 during the winding or unwinding of the yarn 11 is controlled.

Industrial applicability

The invention is applicable during operation at workstations of yarn producing textile machines.