Method for operating a station of a winder and winder

Abstract

A method for operating a station (2) of a spinning machine (1) includes: rewinding yarn (3) from a spindle (22) onto a spinning bobbin (6) by means of a spinning device (5); defining an air ring (14) at least in the width direction by means of an air ring limiting device (18); wherein the air ring limiting device (18) includes at least one air ring limiting member (23, 26) with a yarn guide surface (24, 27); rewinding a first portion of the yarn (3) located on the spinning bobbin (4) onto the spinning bobbin (6), wherein the yarn pull force of the yarn (3) and / or a measurement representing the yarn pull force is detected; when an increase in the yarn pull force is detected, at least one air ring limiting member (23, 26) is switched from a rest position (R) to a working position (A) and then a second portion of the yarn (3) is rewinded onto the spinning bobbin (6). Alternatively, the distance (a1, a2) between the guide surfaces (24, 27) of at least one air ring retainer (23, 26) and the axis of rotation (25) of the spinning bobbin (4) is reduced, and then the second portion of the yarn (3) located on the spinning bobbin (4) is rewound onto the winding bobbin (6). Alternatively, the second air ring retainer (26) with the second guide surface (27) is switched from the rest position (R) to the working position (A). In addition, a station (2) of a winding machine (1) has a detection device (17) and a control unit (13), the detection device being used to detect the yarn pull-out force of the yarn (3) and / or a measurement value representing the yarn pull-out force.

Description

Technical Field

[0001] This invention relates to a method for operating a station of a yarn winding machine, wherein yarn is rewound from a spinning bobbin to a winding bobbin by means of a yarn winding device, wherein during the rewinding process, a yarn air ring formed between the spinning bobbin and the winding bobbin is defined by means of an air ring limiting device, at least in the width direction. The air ring limiting device includes at least one air ring limiting member with a yarn guiding surface. Here, a first portion of the yarn located on the spinning bobbin is rewound to the winding bobbin, wherein the yarn pull-out force of the yarn and / or a measurement representing the yarn pull-out force is detected, wherein at least in the working position of the air ring limiting member or at least during the rewinding of the first portion of the yarn, the yarn guiding surface is at a certain distance relative to the axis of rotation of the spinning bobbin.

[0002] Additionally, the present invention relates to a method for operating a station of a yarn winding machine, wherein the air ring limiting device includes a first air ring limiting member with a first yarn guiding surface, wherein the first yarn guiding surface of the air ring limiting member has a first distance relative to the axis of rotation of the spinning bobbin at least in the working position, wherein a first portion of the yarn located on the spinning bobbin is rewound onto the winding bobbin, wherein the yarn air ring is defined by means of the first yarn guiding surface, and the yarn pull-out force of the yarn and / or a measurement representing the yarn pull-out force is detected.

[0003] Finally, the present invention relates to a station of a yarn winding machine for rewinding yarn from a spinning bobbin onto a winding bobbin by means of a yarn winding device, the station having an air ring limiting device. During the rewinding process, the air ring limiting device is used to define a yarn air ring formed between the spinning bobbin and the winding bobbin, at least in the width direction, wherein the air ring limiting device includes a first air ring limiting member with a first yarn guiding surface, the first yarn guiding surface having a first distance relative to the axis of rotation of the spinning bobbin, at least in the working position of the first air ring limiting member. The station has at least one detection device for detecting the yarn pull-out force of the yarn and / or a measurement value representing the yarn pull-out force. Furthermore, the station has a control device connected to the at least one detection device. Background Technology

[0004] A rewinding machine is used to rewind yarn from a wound spinning bobbin (e.g., from a ring spinning machine) onto a rewinding bobbin, thereby producing larger loops (commonly known as kreuzspulen). This is necessary for subsequent further processing of the yarn, as the spinning bobbin typically contains less yarn. The rewinding machine has multiple winding positions where the rewinding process is performed largely independently of each other. During the rewinding process, the yarns from the individual spinning bobbins are successively joined together by splicers to form a single, continuous yarn. Furthermore, the rewinding process removes yarn defects generated by the upstream spinning machine during the spinning process from the yarn at the rewinding machine by means of a yarn clearer.

[0005] During the rewinding process from the spinning bobbin to the winding bobbin, a yarn air pocket is generated between the unwinding position of the spinning bobbin and the yarn guide positioned after the spinning bobbin along the yarn running direction. This yarn air pocket is formed due to the centrifugal force acting when the yarn is rewound from the spinning bobbin. During the rewinding process, the larger the radius of the yarn air pocket, the greater the yarn tension within the air pocket region. Therefore, numerous experiments have been conducted to influence or limit the yarn air pocket in order to keep the yarn tension during the rewinding process as small as possible and thereby minimize the risk of yarn breakage or adverse effects on yarn quality.

[0006] A spinning machine having stations each equipped with an air ring limiting device is known from DE 10 2006 052 826 A1. The air ring limiting device is adjustable in the vertical direction, allowing it to shift downwards as the unwinding of the yarn feed progresses during the winding process. The air ring limiting device includes a tube that continuously tracks the position of the feed cone in the vertical direction during the winding process, such that the radial distance of the tube relative to the feed cone remains approximately constant. Additionally, the air ring limiting device includes a second tube that is tracked in the vertical direction based on a signal from a yarn tension sensor. Here, a so-called single-weighted yarn air ring (Einfach-Fadenballon) must be reliably set at very high winding speeds throughout the entire winding process. The device is relatively complex in construction. Furthermore, relatively large yarn tension can always be generated depending on the winding state of the yarn. Summary of the Invention

[0007] Therefore, the object of this invention is to provide a method for operating a winding machine station that enables winding at a winding speed that is as constant as possible. A winding machine station is also provided.

[0008] This objective is achieved by a method and a workstation having the features of an independent claim.

[0009] In a method for operating a winding machine, yarn is rewound from a spinning bobbin to a winding bobbin using a winding device. During the rewinding process, a yarn air ring is defined, at least in the width direction, between the spinning bobbin and the winding bobbin by means of an air ring limiting device. The air ring limiting device includes at least one air ring limiting member with a yarn guide surface, which is configurable from a rest position to a working position, wherein in the working position of the at least one air ring limiting member, the yarn guide surface is at a distance relative to the axis of rotation of the spinning bobbin. A first portion of the yarn located on the spinning bobbin is rewound to the winding bobbin, wherein the yarn pull-out force and / or a measurement representing the yarn pull-out force are detected. It is proposed that when the yarn pull force is detected to have increased by a predetermined value, at least one air ring limiting member of the air ring limiting device is changed from the rest position to the working position, and then a second portion of the yarn on the spinning bobbin is rewound onto the winding bobbin, wherein the yarn air ring is defined by means of the yarn guide surface.

[0010] The working position here is the position occupied by the loop retainer during rewinding, and the loop retainer defines the yarn loop. Conversely, the rest position is the position where the loop retainer does not define the yarn loop. The rest position can also be a bobbin changing position, which allows for the replacement of an empty spun bobbin with a fully wound bobbin. However, it is also possible for the loop retainer to switch to a bobbin changing position different from the rest position.

[0011] In all other respects, the axis of rotation is the rotationally symmetrical central longitudinal axis of the spinning bobbin under normal conditions. Furthermore, no rotation of the spinning bobbin occurs during the rewinding process.

[0012] Similarly, the distance of the guide surface relative to the axis of rotation refers to the minimum distance of the guide surface relative to the axis of rotation. The guide surface can be formed in a columnar shape so that it has a uniform distance relative to the axis of rotation. However, the guide surface can also be polygonal or otherwise irregularly shaped. In this case, the term "distance" refers to the minimum distance of the guide surface relative to the axis of rotation.

[0013] In a second method for operating a winding machine station, a first portion of the yarn located on the spinning bobbin is rewound onto the winding bobbin, wherein the yarn pull-out force of the yarn and / or a measurement representing the yarn pull-out force are detected, and wherein the yarn air pocket is defined by means of the yarn guide surface. Here, at least during the rewinding of the first portion of the yarn, the yarn guide surface of the at least one air pocket defining member has a certain distance relative to the axis of rotation of the spinning bobbin. In this second method, it is proposed that when the yarn pull-out force is detected to have increased by a predetermined value, the distance of the yarn guide surface relative to the axis of rotation of the spinning bobbin is reduced, and subsequently a second portion of the yarn located on the spinning bobbin is rewound onto the winding bobbin, wherein the yarn air pocket is defined by means of the yarn guide surface with a reduced distance relative to the axis of rotation.

[0014] In the third method, the loop-limiting device has a first loop-limiting member with a first yarn-guiding surface, where a first portion of the yarn on the spinning bobbin is rewound onto the winding bobbin, wherein the yarn loop is limited by means of the first yarn-guiding surface, and wherein the yarn pull-out force of the yarn and / or a measurement representing the yarn pull-out force is detected. At least during the rewinding of the first portion of the yarn, the first yarn-guiding surface of the loop-limiting member has a first distance relative to the axis of rotation of the spinning bobbin. It is proposed that when the yarn pull-out force is detected to have increased by a predetermined value, the first distance of the first yarn-guiding surface relative to the axis of rotation of the spinning bobbin is reduced, and subsequently a second portion of the yarn on the spinning bobbin is rewound onto the winding bobbin, wherein the yarn loop is limited by means of the first yarn-guiding surface with a reduced distance relative to the axis of rotation.

[0015] Alternatively, in this third method, when the yarn pull force is detected to have increased by a predetermined value, at least one second air ring limiting member of the air ring limiting device with a second yarn guide surface is switched from a rest position where the second air ring limiting member does not limit the yarn air ring to a working position where the second air ring limiting member limits the yarn air ring, and then a second portion of the yarn located on the spinning bobbin is rewound onto the winding bobbin, wherein the yarn air ring is limited by means of the second yarn guide surface.

[0016] For example, when directly measuring yarn pull force, an increase of a predetermined absolute or percentage value relative to the initial value indicates a detected increase in yarn pull force by a predetermined value. Indirect measurement, for example, by analyzing the position of the tensioner, can detect an increase in yarn pull force by the tensioner advancing a predetermined stroke or reaching a predetermined position. This predetermined value can be determined by the operator based on experience and stored in the winding machine's control device. However, the predetermined value can also be obtained and determined by analyzing past unwinding processes during the self-learning process of the winding machine, especially its control device. Alternatively, the winding machine may only suggest the predetermined value, which must still be confirmed by the operator.

[0017] The commonality among all three methods lies in the fact that the action of the guide surface on the yarn, or the enhancement of the guide surface's action on the yarn, depends on the yarn pull-out force. This can be done by changing the balloon limiting member from the rest position to the working position, or by reducing the distance of the guide surface relative to the axis of rotation of the spinning bobbin. Thus, this effect only occurs when an increase in the yarn pull-out force requires an additional or enhanced action from the guide surface. Advantageously, winding can be performed initially without a limiting balloon or with only one guide surface acting on the yarn. Thus, by "activating" or "enhancing" one or more guide surfaces depending on the yarn tension, the yarn pull-out force can be kept substantially constant during winding. This allows the spinning bobbin to be wound with a substantially constant winding tension, thereby producing high-quality yarn loops. It also allows winding at a substantially constant, relatively high working speed throughout the entire winding process. Thus, it is not necessary for the balloon limiting device and the guidance of the spinning bobbin winding state to be continuous and simultaneous, as required by the prior art.

[0018] Here, within the scope of the invention, additional yarn guides or additional air ring limiters may be "activated" multiple times during the rewinding process depending on the yarn pull-out force and / or the distance of one or more yarn guides already acting on the yarn may be reduced multiple times depending on the yarn pull-out force.

[0019] Another proposed station for a yarn winding machine is provided, which is used to rewind yarn from a spinning bobbin to a winding bobbin by means of a yarn winding device. The station has an air ring limiting device for defining a yarn air ring formed between the spinning bobbin and the winding bobbin, at least in the width direction, during the rewinding process. The air ring limiting device includes a first air ring limiting member with a first yarn guide surface, which has a first distance relative to the axis of rotation of the spinning bobbin, at least during rewinding. The station also has at least one detection device for detecting the yarn pull-out force of the yarn and / or a measurement representing the yarn pull-out force. Furthermore, the station has a control device connected to the at least one detection device. In this case, the control device is connected to the air ring limiting device. Depending on the signal from the at least one detection device, the first air ring limiting member of the air ring limiting device can switch from a rest position where the first air ring limiting member does not limit the yarn air ring to a working position where the first air ring limiting member limits the yarn air ring.

[0020] Alternatively, in this workstation setting, it can be proposed that the first distance between the first yarn guide surface and the axis of rotation of the spinning bobbin be reduced, depending on the signal from the detection device.

[0021] According to another embodiment, in this workstation case, as proposed in addition to or in lieu of the above two embodiments, the air ring limiting device includes at least one second air ring limiting member with a second yarn guide surface, the second air ring limiting member being able to switch from a rest position to a working position according to a signal from the at least one detection device.

[0022] As already explained, in such a station, the action of the guide surface on the yarn can be "activated" once or multiple times during the rewinding process, depending on the yarn pull-out force, so that the yarn pull-out force remains substantially constant during winding. This type of station also advantageously allows for winding at a constant operating speed. Because there is no need for a gasket limiting device to continuously track the winding state of the yarn, the station can thus be implemented in a simple and cost-effective manner.

[0023] Advantageously, in the method and apparatus according to the third embodiment, in the working position of the second air ring limiting member, the second yarn guide surface has a second distance relative to the rotation axis of the spinning bobbin, the second distance being smaller than the first distance. The yarn from the ring spinning machine is generally unwound stage by stage, so that the yarn is gradually removed from the spinning bobbin from top to bottom, exposing the spinning bobbin. Therefore, the yarn air ring becomes larger and larger during the winding process. If the second yarn guide surface has a smaller distance relative to the rotation axis of the spinning bobbin than the first yarn guide surface, the yarn air ring can be advantageously tightened more significantly with the second yarn guide surface compared to the first yarn guide surface.

[0024] Furthermore, in order to detect an increase in the yarn pull-out force by a predetermined value, a limit value for the yarn pull-out force and / or a measured value representing the yarn pull-out force is determined, and when the limit value is exceeded, the corresponding air ring limiting member is switched to its working position (A) and / or its distance from the corresponding yarn guide surface is reduced. The limit value can, for example, be the absolute value of the measured yarn pull-out force. Conversely, if the stroke of the tensioning element is detected as a measured value representing the yarn pull-out force, the limit value can also be defined by a certain position of the tensioning element.

[0025] Also advantageously, in order to detect an increase in the yarn pull-out force by a predetermined value, an allowable fluctuation range for the yarn pull-out force and / or a measurement representing the yarn pull-out force is determined, and if the fluctuation range is exceeded, the air ring retainer is switched to its working position and / or the distance is reduced. The fluctuation range can be the allowable deviation of the yarn pull-out force from the previous measurement value. If the corresponding current measurement value deviates from this determined tolerance zone around the previous measurement value, the corresponding air ring retainer can be switched to its working position or the distance to the corresponding yarn guide surface can be reduced.

[0026] Another advantage is that the yarn pull-out force is detected by means of a tension sensor, or, in the case of the workstation, at least one detection device is a tension sensor. Such tension sensors are generally present at the workstation in any case, for example, to control the tensioner based on the yarn pull-out force. The tension sensor can also be advantageously used to trigger the action of starting the yarn guide surface.

[0027] However, it is also advantageous to detect the position and / or adjustment stroke of the tensioning element of the yarn tensioner as a measurement representing the yarn pull-out force. The tensioner is generally operated or adjusted based on the tension; that is, the tensioner is further opened when the yarn pull-out force increases and further closed when the yarn pull-out force decreases. Therefore, in any case, as long as the tensioner has not reached its final position, the position or forward adjustment stroke of the tensioning element is a measurement representing the yarn pull-out force and can be used to trigger the action of the yarn guide surface.

[0028] Correspondingly, it is advantageous to detect the position of the tensioning element by means of a proximity switch, especially an optical sensor. In the case of the aforementioned workstation, it is equally advantageous that the at least one detection device is a proximity switch, especially an optical sensor. However, alternatively, inductive, capacitive, magnetic, or other proximity switches can naturally be considered.

[0029] Alternatively, in the case of the aforementioned workstation, it is advantageous to detect the adjustment stroke of the tensioning element by means of a stroke sensor.

[0030] According to an alternative embodiment of the method, it is advantageous that the adjustment stroke of the tensioning element can be detected by analyzing the adjustment value of the tensioner, particularly the driver of the tensioning element, and / or by measuring the load value. For example, the number of steps of the stepper motor can be detected when the tensioner is moved by means of a stepper motor. Similarly, the adjustment stroke can also be obtained from the current, voltage, or other load values ​​of the tensioner driver. In the case of the aforementioned workstation, the controller of the driver is the at least one detection device.

[0031] Another advantage is that the first gas ring defining member and / or the at least one second gas ring defining member are gas ring tightening rings. The gas ring tightening ring is not necessarily circular, but may also have polygonal or other, even irregularly shaped forms. The first and / or second gas ring defining members may also be tubular structures. The gas ring defining members may be completely closed or have openings. The gas ring defining members may also be formed to be separable.

[0032] It is advantageous when the first air ring defining member and / or the at least one second air ring defining member have at least two defining elements, which are movable from a first position to a second position. The defining elements may, for example, occupy the first position in the rest position of the air ring defining member and the second position in the working position. It is also possible that the defining element occupies the first position to form a yarn guide surface with a first distance relative to the axis of rotation of the spinning bobbin, and that the defining element occupies the second position to form a yarn guide surface with a second distance relative to the axis of rotation. It is also conceivable that more than two defining elements may be used, which may form yarn guide surfaces with different diameters depending on the baffle type.

[0033] It is also advantageous when the first gasket retainer and / or at least one second gasket retainer can be switched to the stylist-changing position. The stylist-changing position differs from the rest position in this case. However, it is also possible that the rest position is simultaneously the stylist-changing position. The switching of the first or second gasket retainer to the stylist-changing position can theoretically be performed in different ways. For example, it is conceivable to open the separable gasket tightening ring until the stylist can be removed. Alternatively, the gasket retainer or the entire gasket retaining device can be pivoted or linearly displaced to switch from the working or rest position to the stylist-changing position.

[0034] Advantageously, for example, the workstation has a drive mechanism by which the first and / or second air ring retainers can be moved along the guide in a direction toward the axis of rotation of the spinning bobbin. Thus, the air ring retainers can, for example, be moved from a rest position or a weft-changing position above the spinning bobbin to a working position at the height of the spinning bobbin.

[0035] Especially in the case of a gasket limiting device with two gasket limiting members, it is advantageous that the first and second gasket limiting members are movably supported at the guide via a common carrier. The two gasket limiting members can thus be, for example, jointly moved to a cable-changing position above the cable. Similarly, at least one of the two gasket limiting members, or both gasket limiting members, can be jointly moved to their working position. Attached Figure Description

[0036] Other advantages of the invention will be described in the following embodiments. These include:

[0037] Figure 1 A front view of a winding machine with multiple stations arranged side by side is shown.

[0038] Figure 2 A front view of the station of a winding machine with a fully closed tensioner is shown;

[0039] Figure 3 It shows Figure 2 The workstation where the yarn tensioner is fully open;

[0040] Figure 4 A detailed view of the front view of the weft and air ring limiting device according to the first embodiment at the first time point at the start of the rewinding process is shown;

[0041] Figure 5 It shows Figure 4 A schematic diagram of the weft and air ring limiting device at a second time point during the rewinding process;

[0042] Figure 6 It shows Figure 4 A schematic diagram of the weft and air ring limiting device at the third time point during the rewinding process;

[0043] Figure 7 A detailed view of the front view of the weft and air ring limiting device according to the second embodiment at the first time point at the start of the rewinding process is shown;

[0044] Figure 8 It shows Figure 7 A schematic diagram of the weft and air ring limiting device at a second time point during the rewinding process;

[0045] Figure 9 It shows Figure 7 A schematic diagram of the weft and air ring limiting device at the third time point during the rewinding process;

[0046] Figure 10 A schematic diagram showing the yarn pull-out force and the limit value of the yarn pull-out force during the winding process is shown.

[0047] Figure 11 A schematic diagram showing the yarn pull-out force and the fluctuation range of the yarn pull-out force during the winding process is shown.

[0048] Figure 12 The previous view shows a detailed illustration of the tensioner and the detection of the tensioner's adjustment stroke;

[0049] Figure 13 A top view shows the gas ring retainer with two defining elements in the resting position;

[0050] Figure 14 Showing the work position Figure 12 Aerodynamic components;

[0051] Figure 15 A top view shows a gasket defining a component with two defining elements in a first position; and

[0052] Figure 16 It is shown to have two defining elements in the second position. Figure 15 The air ring is a limiting component. Detailed Implementation

[0053] In the following description of the embodiments, the same or at least similar configurations and / or modes of operation are provided with the same reference numerals. Furthermore, these reference numerals are explained in detail only upon first mention, while in subsequent embodiments only differences from the already described embodiments are illustrated. Additionally, for clarity, only one or a few of a plurality of identical components or features are typically labeled.

[0054] Figure 1 A front view of the winding machine 1 is shown. The winding machine 1 has multiple stations 2 arranged side by side between two frames 21, only one of which is shown here. The stations 2 are configured to unwind yarn 3 from the bobbin 22 with the spinning bobbin 4 and wind it onto the winding bobbin 6 by means of a winding device 5. The stations 2 have multiple working mechanisms for this purpose. The working mechanisms include a splicer 16, a movable suction nozzle for locating the yarn end on the winding bobbin side, and a movable suction nozzle 20 for locating the yarn end of the spinning bobbin layer. The splicer connects the yarn end on the spinning bobbin side to the yarn end on the winding bobbin side after yarn breakage, clearing cuts, or idling of the spinning bobbin 4. In addition, the station has a yarn clearer 12.

[0055] The winding machine 1 has a central control device 13 that controls the processes executed at the winding machine 1. Additionally, as shown here, each of these workstations 2 may also have its own control device 13, which is connected to the central control device 13 and controls the processes executed at each workstation 2.

[0056] The yarn 3 wound on the spinning bobbin 4 is drawn out of the spinning bobbin 4 and passes through the air ring limiter 23, the yarn guide 15, and the tensioner 7, which applies an adjustable yarn pull-out force to the running yarn 3 (see [link]). Figure 10 and Figure 11 Therefore, the tensioner 7 can be correspondingly controlled by the control device 13 at the yarn winding position 2. In order to measure the yarn pull force, the tension sensor 10 is arranged near the yarn winding bobbin 6 in the present case. The tensioner 7 is set according to the measured yarn pull force, and the yarn pull force is adjusted accordingly.

[0057] Now by means of Figure 2 and Figure 3 Detailed explanation of yarn tensioner 7. Here, Figure 2 The previous view shows station 2. The tensioner 7 is shown here in the closed position GP. In the conventional winding operation, the tensioner 7 occupies a partially closed position, causing the yarn 3 to turn multiple times at the tensioner 7 and thus be subjected to friction. By further opening or closing the tensioner 7, the yarn pull-out force can be affected. The tensioner 7 shown is formed as a rake-type tensioner and has two tensioning elements 8 that can move relative to each other by means of a driver 9. Here, only one of the two tensioning elements 8 can be moved, or as shown, both tensioning elements 8 can be moved. In addition, the yarn air ring 14 formed between the spinning bobbin 4 and the winding bobbin 6 during the rewinding process is also shown in this figure.

[0058] In contrast, Figure 3The tensioner 7 is shown in the fully open position OP, allowing the yarn 3 to pass freely and without contact through the tensioner 7. Accordingly, in this position, no tension is applied to the yarn 3.

[0059] With the help of the tensioner 7, the yarn pull force can be adjusted and kept substantially constant in another area of ​​the yarn winding process. However, once the tensioner 7 has reached the fully open position OP or the closed position GP, ​​or the tensioning element 8 has reached its final position, the yarn pull force can no longer be affected by the tensioner 7. Therefore, in order to continue to keep the yarn pull force low, it is proposed to use the air ring limiting device 18 (see...) Figure 4 The shape and size of the yarn loop 14 are affected by the yarn pull-out force.

[0060] Figure 4 A first embodiment of the air ring limiting device 18 and a bobbin 22 with a spinning bobbin 4 are shown. The air ring limiting device 18 has air ring limiting members 23 and 26, which are currently formed as air ring tightening rings. The air ring limiting members 23 and 26 have yarn guiding surfaces 24 and 27, which are spaced a distance a1 and a2 relative to the axis of rotation 25 of the bobbin 22 or the spinning bobbin 4. (See also...) Figure 4 As can still be seen, the air-ring limiting device 18 is connected to the control device 13, as shown by the dashed line. The control device 13 is further connected to the detection device 17, which detects the yarn pull-out force or a measurement representing the yarn pull-out force. Figure 4 This shows station 2 or spindle 22 at the start of the rewinding process. The spinning bobbin 4 is not fully wound at this point. Therefore, the resulting yarn loop 14 has only a relatively small height and width at this point. In this example, the loop retainers 23 and 26 are fixed in their height relative to the spinning bobbin 4 throughout the entire rewinding process, i.e., they do not shift along the axis of rotation 25.

[0061] Figure 5 This shows another point in the rewinding process, after a portion of the yarn 3 wound on the spinning bobbin 4 has been unwound. Figure 4 The spindle 22 or station 2. Here it can be seen that during unwinding, the yarn is gradually removed from the spinning bobbin 4 from top to bottom, and thus the upper spindle cone moves further downward. The yarn air ring has thus become larger, so that the yarn guide surfaces 24, 27 now act on the yarn 3 and the yarn air ring 14 is defined in the width direction. This creates a double air ring, thereby reducing the centrifugal force in the yarn air ring 14 and thus also reducing the yarn pull-out force. Now the first part of the yarn 3 located on the spinning bobbin 4 is unwound, wherein the yarn air ring 14 is defined by means of the yarn guide surfaces 24, 27.

[0062] However, even with the limitation imposed by the yarn guide surfaces 24 and 27, the increase in yarn pull-out force mainly occurs in the latter half of the rewinding process. If the detection device 17 detects an increase of a predetermined value, the distances a1 and a2 of the yarn guide surfaces 24 and 27 relative to the rotation axis 25 are reduced based on this signal from the detection device 17.

[0063] Figure 6 Show Figure 4 and Figure 5 The diagram shows the yarn guides 22 and the air ring limiting device 18 at a third time point, where the distances a1 and a2 between the yarn guides 24 and 27 and the axis of rotation 25 have just been reduced. At this time, the second part of the yarn 3 is unwound from the spinning bobbin 4, where the yarn guides 24 and 27 now act on the yarn air ring 14 at reduced distances a1 and a2. Although the yarn air ring 14 now becomes higher following the winding state of the spinning bobbin 4, this now cancels out any further widening in the width direction, so that the yarn air ring 14 is now defined by the yarn guides 24 and 27, which have been contracted to smaller distances a1 and a2.

[0064] The reduction of the distances a1 and a2 between the yarn guide surfaces 24 and 27 can be achieved, for example, by moving two or more defining elements 29 of the air ring defining members 23 and 26 from the first position I to the second position II, as will be done later by means of... Figure 15 and Figure 16 Explanation.

[0065] Figure 7 A second embodiment of the loop limiting device 18 is shown. This embodiment has a first loop limiting member 23, which is also formed as a loop tightening ring and has a yarn guiding surface 24, which is spaced a distance a1 relative to the axis of rotation 25 of the bobbin 22 or spinning bobbin 4. Additionally, the loop limiting device 18 has a second loop limiting member 26 with a second yarn guiding surface 27. The second loop limiting member 26 can... Figure 7 and Figure 8 The rest position R shown is converted to Figure 9 The working position is shown as A. Here, the air ring limiting device 18 is also connected to the control device 13, as indicated by the dotted line. Figure 7 Here again, the weft 22 is shown at the beginning of the rewinding process, before the spinning bobbin has been completely wound.

[0066] Figure 8 Show Figure 7At station 22 or work position 2, the first portion of the yarn 3 being unwound from the spinning bobbin 4 is now in the process of being unwound, wherein the guide surface 24 of the first air ring limiter 23 acts on the yarn 3 and the yarn air ring 14 is defined in the width direction. The second air ring limiter 26 remains in its rest position R. In order to change the second air ring limiter 26 to its working position A (see... Figure 9 In ), the limiting element 29 (see ) can be re-inserted. Figures 13-16 The valve moves from position I to position II. In the current example, this is done by pivoting the defining element 29 by 90°. The valve defining element 26 is thus formed as a separable valve tightening ring.

[0067] at last, Figure 9 Show Figure 7 and Figure 8 This is a schematic diagram of the yarn guide 22 and the air ring limiting device 18 at the point in time immediately after the detection device 17 detects an increase in yarn pull force. Based on the signal from the detection device 17, the control device 13 again operates the air ring limiting device 18 and moves the air ring limiting member 26 from its rest position R to its working position A. In working position A, the second yarn guide surface 27 has a distance a2 relative to the rotation axis 25, which is currently less than the distance a1 of the first yarn guide surface 24 relative to the rotation axis 25. Now, the second portion of the yarn 3 is unwound from the spinning bobbin 4, wherein the second yarn guide surface 27 acts on and limits the yarn air ring 14 at the second distance a2.

[0068] and Figures 7-9 In the different embodiments shown, the distance a2 of the second air ring defining member 26 relative to the rotation axis 25 does not necessarily have to be less than the distance a1 of the first air ring defining member 23. It is also conceivable that the first yarn guide surface 24 and the second yarn guide surface 27 simultaneously act on and define the yarn air ring 14. Based on the distances of the two air ring defining members 23 and 26 relative to each other, multiple air rings are formed in this case.

[0069] In addition, with Figures 7-9 The illustrations differ, and it's also possible that the air ring limiting device 18 is different from... Figures 4-6 Similarly, each has only a single air ring retainer 23, 26, which can be switched from the rest position R to the working position A. Then, the air ring retainer can also be activated based on a signal of increased yarn pull-out force detected by the detection device 17 (see...). Figure 10 and Figure 11 The process transitions from rest position R to working position A.

[0070] It is also possible to incorporate multiple air ring limiting elements 23 and 26 into the air ring limiting device 18, which sequentially or partially simultaneously transition from their rest position R to their working position A upon detecting an increase in yarn pull force, or respectively reduce their distances a1 and a2 relative to the rotation axis 25 upon detecting an increase in yarn pull force. Different embodiments of the air ring limiting elements 23 and 26 can also be combined within a single air ring limiting device 18.

[0071] To trigger the transition from rest position R to working position A and / or the decrease in distances a1 and a2 respectively, a preset limit value of 28 can be set for the yarn pull-out force, for example. This is in Figure 10 It is displayed in the middle.

[0072] Finally, it is also possible that these two air ring retainers 23, 26, or other air ring retainers 23, 26, are arranged together at station 2 in a height-adjustable manner. For this purpose, the air ring retainers 23, 26 can, for example, be arranged on a common carrier, which is movably and drivably supported on a guide extending in the direction of the rotation axis 25. The air ring retainers 23, 26 can here be arranged at a constant height relative to the spinning bobbin 4 during the rewinding process, but can be moved to a weft-changing position above the spinning bobbin to remove the emptied spinning bobbin 4 and replace it with a fully wound spinning bobbin 4.

[0073] Figure 10 The curve shows the yarn pull force over the entire rewinding process or the length of the yarn run (e.g., the length it would have run without the influence of the air ring). It can be seen that the yarn pull force is largely constant in the first half of the rewinding process, increasing in the second half. Furthermore, it can be observed that the yarn pull force increases exponentially at the end of the rewinding process, especially in the last third. Because small fluctuations in yarn pull force do not cause problems and can generally be compensated for by the tensioner 7, the limit value 28 can, for example, be 20% higher than the yarn pull force value in the first half of the rewinding process.

[0074] Alternatively, it's possible to use an excess of 30 units of fluctuation as the trigger signal, instead of exceeding the limit of 28 units. This is in... Figure 11 It is displayed in the middle.

[0075] Since minor fluctuations in yarn pull force are acceptable, it can be determined that a fluctuation range of 5-10 N within a certain comparison period is permissible. The yarn pull force is continuously measured and compared with previous measurements over the comparison period. If the fluctuation exceeds the permissible range of 30 N, such as in... Figure 11As shown, this situation is detected by the detection device 17 and a signal is output to the control device 13. The control device 13 can then operate the air ring limiting device 18 based on this signal, so as to activate the additional air ring limiting members 23, 26 or reduce the distances a1, a2 of the yarn guide surfaces 24, 27 relative to the rotation axis 25.

[0076] Alternatively, instead of directly measuring yarn pull-out force, one can measure a value that represents yarn pull-out force. This is in... Figure 12 It is displayed in the middle.

[0077] Figure 12 This diagram shows a detailed view of a yarn tensioner 7 with two movable tensioning elements 8 via a driver 9. As mentioned at the beginning, the driver 9 is operated based on a signal from a tension sensor 10 that measures the yarn pull-out force. Thus, as exemplarily shown here, the current adjustment stroke s of the tensioning element 8 located on the right side of the diagram, or the current position of the tensioning element 8, corresponds to an indirect characteristic value of the yarn pull-out force.

[0078] In the current example, sensor 11 is used to detect whether the tensioning element 8 is in its fully open position OP. The closed position GP of the tensioner 7 is also shown with a dotted line. However, the advancing adjustment stroke s can also be detected using a stroke sensor.

[0079] Figure 13 and Figure 14 Finally, a gasket defining member 23, 26 with two defining elements 29 is also shown, which can be drawn from... Figure 13 The first position I shown in the middle moves to the Figure 14 The second position II is shown in the diagram. These two defining elements 29 are pivotally supported for this purpose (however, they are shown in a disassembled manner in the present case). In the current example, when the defining elements 29 occupy the first position I, the loop defining elements 23 and 26 are in the rest position R. In the rest position R, the loop defining elements 23 and 26 do not define the yarn loop 14. Since the defining elements 29 are outwardly removed from the periphery of the bobbin 22 in this rest position R, the rest position R can also be used as a bobbin changing position.

[0080] On the contrary, Figure 14 In the working position A of the air ring limiting members 23 and 26 shown, the limiting element 29 occupies the second position II. In this position, the limiting element 29 forms a closed air ring tightening ring and can limit the yarn air ring 14.

[0081] As from Figure 14It can be further understood that, since the air ring retainers 23 and 26 have a rest position R, it is also possible that the diameters of the yarn guide surfaces 24 and 27 of the air ring retainers 23 and 26 are smaller than the outer diameter of the bobbin 22. If this is the case, the air ring retainers 23 and 26 can only move into their working position A when at least the upper part of the spinning bobbin 24 has been exposed.

[0082] on the contrary, Figure 15 and Figure 16 Another embodiment of the air ring retainer 23, 26 with retaining element 29 is shown, which can be moved from a first position I to a second position II. This embodiment of the air ring retainer 23, 26 can be advantageously used to reduce the distances a1, a2 of the yarn guide surfaces 24, 27 relative to the rotation axis 25 of the bobbin 22, or to reduce the internal dimensions (in this case, the inner diameter) of the yarn guide surfaces 24, 27. Figure 15 In the middle, the limiting element 29 is in the first position I, in which the yarn guiding surfaces 24 and 27 form a larger diameter. Conversely, in Figure 16 In the second position II, the limiting element 29 is constricted and thus has a smaller diameter and consequently a reduced distance a1, a2 relative to the rotation axis 25. Figures 4-6 The distances a1, a2, and the rotation axis 25 can be seen in the image, but... Figure 15 and Figure 16 It is not shown in the document.

[0083] In the accompanying drawings described herein, the corresponding air ring retainers 23, 26 are configured to transition from the rest position R to the working position A, such that the movable retaining element 29 moves from the first position I to the second position II. However, it is also possible that one or more air ring retainers 23, 26 are arranged at station 2 in a manner that allows them to move together (e.g., along the axis of rotation 25), so as to be positioned, for example, near the yarn guide 15 above the bobbin 22 (see...). Figures 2-9 The rest position R is switched to its working position A.

[0084] This invention is not limited to the embodiments shown and illustrated. Modifications within the scope of the claims are also possible, such as any combination of the illustrated features, even if these features are shown and illustrated in different parts of the specification or claims or in different embodiments, provided that they do not conflict with the impartial content of the independent claims.

[0085] List of reference numerals

[0086] 1. Yarn winding machine

[0087] 2 workstations

[0088] 3 Yarn

[0089] 4 Spinning bobbin

[0090] 5 Yarn winding device

[0091] 6 Winding bobbin

[0092] 7 Yarn tensioner

[0093] 8 Tension element

[0094] 9 Driver for tension element

[0095] 10 Tension sensor

[0096] 11 Sensor

[0097] 12 Yarn clearer

[0098] 13 Control device

[0099] 14 Yarn balloon

[0100] 15 Yarn guide member

[0101] 16 Splicer

[0102] 17 Detection device

[0103] 18 Balloon limiting device

[0104] 19 Suction nozzle

[0105] 20 Suction pipe

[0106] 21 Frame

[0107] 22 Cop

[0108] 23 First balloon limiting member

[0109] 24 First yarn guiding surface

[0110] 25 Rotation axis

[0111] 26 Second balloon limiting member

[0112] 27 Second yarn guiding surface

[0113] 28 Limit value

[0114] 29 Limiting element

[0115] 30 Pivoting range

[0116] A Working position

[0117] R Rest position

[0118] a1 First distance

[0119] a2 Second distance

[0120] s Adjust the distance

[0121] I First Position

[0122] II Second Position

[0123] GP tensioner closed position

[0124] OP tensioner opening position

Claims

1. A method for operating a station (2) of a yarn winding machine (1), the method comprising: With the aid of a winding device (5), the yarn (3) is rewound from the spindle (22) with the spinning bobbin (4) onto the winding bobbin (6); During the rewinding process, a yarn air ring (14) formed between the spinning bobbin (4) and the winding bobbin (6) is defined at least in the width direction by means of an air ring limiting device (18). The air ring limiting device (18) includes at least one air ring limiting member (23, 26) with a yarn guide surface (24, 27), which is capable of switching from a rest position (R) to a working position (A). In the rest position (R), it does not limit the yarn air ring (14), and in the working position (A), it limits the yarn air ring. In the working position of the at least one air ring limiting member (23, 26), the yarn guiding surface (24, 27) has a distance (a1, a2) relative to the rotation axis (25) of the spinning cylinder (4); The invention is characterized in that a first portion of the yarn (3) located on the spinning bobbin (4) is rewound onto the winding bobbin (6), and a measurement representing the yarn pull-out force is detected, wherein the position and / or adjustment stroke (s) of the tensioning element (8) of the yarn tensioner (7) is acquired as a measurement representing the yarn pull-out force; when the yarn pull-out force is detected to have increased by a predetermined value, at least one air ring limiting member (23, 26) of the air ring limiting device (18) is changed from the rest position (R) to the working position (A), and then a second portion of the yarn (3) located on the spinning bobbin (4) is rewound onto the winding bobbin (6), wherein the yarn air ring (14) is defined by means of the yarn guide surface (24, 27).

2. A method for operating a station (2) of a yarn winding machine (1), the method comprising: With the aid of a winding device (5), the yarn (3) is rewound from the spindle (22) with the spinning bobbin (4) onto the winding bobbin (6); During the rewinding process, a yarn air ring (14) formed between the spinning bobbin (4) and the winding bobbin (6) is defined at least in the width direction by means of an air ring limiting device (18). The air ring limiting device (18) includes a first air ring limiting member (23) with a first yarn guide surface (24). A first portion of the yarn (3) located on the spinning bobbin (4) is rewound onto the winding bobbin (6), wherein the yarn air ring (14) is defined by means of the first yarn guide surface (24), wherein at least during the rewinding of the first portion of the yarn (3), the first yarn guide surface (24) of the air ring defining member (23) has a first distance (a1) relative to the axis of rotation (25) of the spinning bobbin (4). Its features are, The measurement value representing the yarn pull force is detected, wherein the position and / or adjustment stroke (s) of the tensioning element (8) of the tensioner (7) are detected as the measurement value representing the yarn pull force; When the yarn pull force is detected to have increased by a predetermined value, the first distance (a1) of the first yarn guide surface (24) relative to the rotation axis (25) of the spinning bobbin (4) is reduced, and then the second portion of the yarn (3) located on the spinning bobbin (4) is rewound onto the winding bobbin (6), wherein the yarn air ring (14) is defined by means of the first yarn guide surface (24) at the reduced first distance (a1) relative to the rotation axis (25). And / or, at least one second air ring limiting member (26) of the air ring limiting device (18) with a second yarn guide surface (27) is switched from the rest position (R) to the working position (A), in which it does not limit the yarn air ring (14), and in the working position (A) it limits the yarn air ring, and then the second portion of the yarn (3) located on the spinning bobbin (4) is rewound onto the winding bobbin (6), wherein the yarn air ring (14) is limited by means of the second yarn guide surface (27).

3. The method of claim 2, wherein, In the working position (A) of the second air ring limiting member (26), the second yarn guide surface (27) has a second distance (a2) relative to the rotation axis (25) of the spinning bobbin (4), the second distance being smaller than the first distance (a1).

4. The method according to claim 1 or 3, characterized in that, Also includes: Determine the limit value (28) representing the measured value of the yarn pull-out force, and when the limit value (28) is exceeded, switch the air ring limiter (23, 26) to its working position (A) and / or reduce the distance (a1, a2).

5. The method according to claim 1 or 3, characterized in that, Also includes: Determine the permissible fluctuation range (30) of the measured value representing the yarn pull-out force, and when the fluctuation range (30) is exceeded, switch the air ring limiter (23, 26) to its working position (A) and / or reduce the distance (a1, a2).

6. The method according to claim 1 or 3, characterized in that, The yarn pull-out force is detected by means of a tension sensor (10).

7. The method according to claim 1 or 3, characterized in that, The adjustment stroke (s) of the tensioning element (8) is detected by analyzing the adjustment value of the driver (9) of the tensioner (7) and / or by measuring the load value.

8. The method according to claim 1 or 3, characterized in that, The adjustment stroke (s) of the tensioning element (8) is detected by analyzing the adjustment value of the driver (9) of the tensioning element (8) and / or by measuring the load value.

9. A station (2) of a winding machine (1) for rewinding yarn (3) from a spindle (22) having a spinning bobbin (4) onto a winding bobbin (6) by means of a winding device (5); The station has an air ring limiting device (18) for defining a yarn air ring (14) formed between the spinning bobbin (4) and the winding bobbin (6) at least in the width direction during the rewinding process, wherein the air ring limiting device (18) includes a first air ring limiting member (23) with a first yarn guide surface (24). At least during rewinding, the first guide surface has a first distance (a1) relative to the axis of rotation (25) of the spinning bobbin (4). It is equipped with a yarn tensioner (7) and a control unit (13); Its features are, The workstation has at least one detection device (17) for detecting a measurement value representing the yarn pull-out force; the control unit is connected to the at least one detection device (17); wherein the detection device detects the position and / or adjustment stroke (s) of the tensioning element (8) of the tensioner (7) as a measurement value representing the yarn pull-out force; The control unit (13) is connected to the air ring limiting device (18), and when the yarn pull force is detected to increase by a predetermined value, the first air ring limiting member (23) of the air ring limiting device (18) can switch from the rest position (R) to the working position (A) according to the signal of the at least one detection device (17). In the rest position (R), it does not limit the yarn air ring (14), and in the working position (A), it limits the yarn air ring. Alternatively, when the yarn pull force is detected to increase by a predetermined value, it can reduce the first distance (a1) of the first yarn guide surface (24) relative to the rotation axis (25) of the spinning bobbin (4) according to the signal of the at least one detection device (17). And / or, the air ring limiting device (18) includes at least one second air ring limiting member (26) with a second yarn guide surface (27), which, when the yarn pull force is detected to increase by a predetermined value, can switch from a rest position (R) to a working position (A) according to the signal of the at least one detection device (17), in which it does not limit the yarn air ring (14), and in the working position (A) it limits the yarn air ring.

10. The workstation (2) according to claim 9, characterized in that, In the working position (A) of the at least one second air ring limiting member (26), the second yarn guide surface (27) has a second distance (a2) relative to the rotation axis (25) of the spinning bobbin (4), the second distance being less than the first distance (a1).

11. The workstation (2) according to claim 9, characterized in that, The at least one detection device (17) is a tension sensor (10).

12. The workstation (2) according to claim 9, characterized in that, The at least one detection device (17) is a proximity switch, a distance sensor, or an identification sensor.

13. A station (2) according to claim 9, characterized in that, The at least one detection device (17) is an optical sensor.

14. A station (2) according to claim 9, characterized in that, The at least one detection device (17) is a stroke sensor.

15. The workstation (2) according to claim 9, characterized in that, The at least one detection device (17) is the controller of the driver (9) of the tensioner (7).

16. A station (2) according to claim 9, characterized in that The first gas ring limiting member (23) and / or the at least one second gas ring limiting member (26) are gas ring tightening rings.

17. The workstation (2) according to claim 9, characterized in that, The first air ring defining member (23) and / or the at least one second air ring defining member (26) have at least two defining elements (29) that are movable from a first position (I) to a second position (II).

18. The workstation (2) according to claim 9, characterized in that, The first gasket (23) and / or at least one second gasket can be switched to the twill change position.

Images