JP5916374B2 - Method for operating a winder and winder - Google Patents

Description

  The present invention relates to a winder having a number of work unit portions in which yarns are wound up one by one from a spinning cup into a traverse package, and a method for operating the winder.

  The winder is provided with one sensor for measuring the amount representing the yarn tension when the yarn travels, and a yarn tensioner for giving the yarn tension to the yarn, and a measured amount representing the above-described yarn tension; The yarn tension is controlled in a closed loop by comparing the target value of the amount representing the yarn tension, generating an adjustment signal for the yarn tensioner depending on the comparison, and adjusting the yarn tension. Here, the failure of the sensor is confirmed, and based on this, the yarn tension is controlled in an open loop.

  In the known winder, the above-described yarn tension force or yarn tension, that is, the yarn tension force on the yarn cross section, is controlled by open loop control or closed loop control. When the above-described yarn tension is subjected to open loop control, a sensor is not necessary, and a constant adjustment signal can be set in advance in the yarn tensioner, for example. In order to control the above-described yarn tension in a closed loop, a sensor for measuring an amount representing the yarn tension is necessary. Usually a so-called yarn tension sensor is used. The operator can set in advance whether the above-described yarn tension is to be closed-loop controlled or open-loop controlled. Such a setting is preferably preset for each lot. Here, one lot is composed of a plurality of work unit units in which the same yarn is wound around a plurality of traverse packages with the same characteristics. Basically, the operator can set the open loop control when the yarn tension sensor is provided. In this case, the yarn tension sensor is deactivated or at least the measured values are not used by the control unit.

  It is known from JP 2009-242097 A that there is a weak yarn that can be damaged by contact with a tension sensor. Nevertheless, in order to realize a yarn tension process sufficiently corresponding to the yarn tension setting value, a tension application pattern is created before the actual winding process. That is, a target course for the adjustment signal of the yarn tensioner is created. According to the above cited specification, the yarn tension is reduced as the diameter of the winding bobbin increases. For this reason, a sample package is produced to obtain the pattern described above. A tension sensor is used when producing the wound sample. Here, the yarn tension adjustment signal detected when the wound sample is produced is used as a tension application pattern in a number of work unit sections. The above sample package cannot be used subsequently. This is because the yarn to be wound is necessarily damaged by the tension sensor. If yarn breakage frequently occurs due to contact between the yarn and the tension sensor, it may be necessary to use a yarn different from the yarn to be processed later for the wound sample. Furthermore, the production of sample packages leads to lost productivity. Therefore, the above solution is only meaningful under the special circumstances described in JP2009-242097A.

  It is known that the yarn tension increases if the yarn is drawn from the spinning cup without a corresponding effect. Nevertheless, in order to keep the yarn tension constant, the yarn tension can be closed-loop controlled using the yarn tensioner as described above. In this case, the tensioner pressure is reduced in accordance with the increase in yarn tension resulting from winding. In addition to the thread tensioner, the thread tension can be influenced by the winding speed. For this reason, for example, from DE 37 33 597 A1, it is known to open-loop control the winding speed depending on the length of the yarn remaining in the spinning cup. Such closed loop control of the winding speed can be performed alternatively or in addition to the closed loop control of the yarn tension using the yarn tensioner. When the above-described yarn tension is controlled in a closed loop, depending on the yarn tensioner, the winding speed can be changed only when the predetermined yarn tension can no longer be maintained. If the length of the yarn remaining in the spinning cup is reduced, the yarn tension will increase without further influence. Therefore, when the yarn tensioner begins to move the cup, a relatively large pressure is applied, and this pressure is lowered during the cup movement. In addition, the thread tensioner can reach a point where the pressure can no longer be reduced. This means that the yarn tension can be increased. In order to prevent this, the winding speed can be lowered. Advantageously, this speed is reduced stepwise. In the first stage, this speed is reduced by a predetermined percentage to lower the thread tension, which will inevitably increase the pressure of the thread tensioner again, so that the thread tension is kept constant. To do. The yarn tension can now be closed loop controlled again using a yarn tension sensor and a yarn tensioner. Here, the winding speed is further reduced in the second stage only when the pressure of the yarn tensioner is again reduced to the minimum value.

  Maintaining a predetermined yarn tension for the required quality of the traverse package is extremely important in many cases, so the yarn tension is controlled in a closed loop as described above. In many cases, it is important that the yarn tension sensor or a sensor corresponding thereto functions normally. If the sensor fails, closed loop control of the yarn tension can no longer be performed. The winder stops, or at least the corresponding work unit section stops.

  For this reason, JP 2009-242096 A proposes that the measured value of the tension sensor in the work unit is stored, and if the tension center fails, the last stored tension value before this failure Is based on open loop control of the yarn tension. Alternatively, since the yarn tension is controlled in an open loop in the work unit portion where the failure has occurred, the average value of the measured values detected in a plurality of other work unit portions before this failure can be used. In other words, the winder can continue to operate even if the sensor fails. However, unless a new measurement is supplied by the tension sensor described above, the tension measurement used to control the yarn tension is constant regardless of whether the last value or the average value of another work unit is used. Remains. This method is therefore not suitable for faults that last relatively long and cannot be removed directly. This is especially true because the effects caused by unwinding the cup can be adjusted completely or partially by thread tension closed loop control if the sensor functions normally. This is no longer possible with open loop control by a constant value.

JP 2009-242096 A DE 37 33 597 A1

  The object of the present invention is to improve the behavior of a winder in which the thread tension is closed-loop controlled in the individual work unit sections if the sensor measuring the quantity representing the thread tension fails.

  According to a first aspect of the present invention, there is provided a method for operating a winder having a plurality of work unit portions for winding one yarn at a time from a spinning cup onto a traverse package, wherein the yarn is One sensor for measuring the amount representing the yarn tension and a yarn tensioner for applying the yarn tension to the yarn are disposed during the running of the yarn, and the measured amount representing the yarn tension and the target value for the amount representing the yarn tension. Depending on the comparison, an adjustment signal for the yarn tensioner is generated to adjust the yarn tension, and after confirming the failure of one sensor, the yarn tension is controlled in an open loop, and the winder is operated. In the method, a quantity representing the length of the yarn remaining in the spinning cup is detected, respectively, and closed loop control depending on the length of yarn remaining in the spinning cup. In order to obtain an empirical value for this adjustment signal from at least one adjustment signal detected during winding by the specified yarn tension, if one sensor breaks down, the yarn tensioner controls the yarn tension in an open loop. Depending on the length of the yarn remaining, this is solved by using the empirical value for the adjustment signal determined previously as the adjustment signal.

  According to a twelfth aspect of the present invention, there is provided a winder having a plurality of working unit portions each configured to wind a yarn from a spinning cup into a traverse package, wherein the yarn travels as described above. Sometimes, one sensor for measuring the amount representing the yarn tension and a yarn tensioner for giving the yarn tension to the yarn are arranged, and a control means for controlling the yarn tension in a closed loop is provided. The control means compares the measured amount representing the yarn tension with the target value of the amount representing the yarn tension and, depending on this comparison, generates an adjustment signal for the yarn tensioner to adjust the yarn tension. The control means is configured to open-loop control the yarn tension when the above-mentioned sensor fails. In this case, the control means detects an amount representing the length of the yarn remaining in the spinning cup, and therefore, depending on the length of the yarn remaining in the spinning cup, winding by the yarn tension controlled in a closed loop is performed. To obtain an empirical value for the adjustment signal from at least one adjustment signal detected during take-up, and in the event of a sensor failure, it depends on an amount representing the length of the yarn remaining in the spinning cup. This is solved by configuring the yarn tensioner for the yarn tensioner to be controlled using at least a part of the experience value as an adjustment signal.

  Advantageous developments of the invention are described in the dependent claims.

It is a figure which shows the winder of this invention which has many operation | work unit parts. It is a figure which shows one work unit part of the winder by this invention. It is a block diagram for carrying out closed loop control of the yarn pulling force. It is a graph which shows the time passage of the adjustment signal of the thread tension force controlled by closed loop control, and the thread tensioner corresponding to this. FIG. 6 is a block diagram for open-loop control of the yarn tension force during failure of the yarn tension sensor.

  In the present invention, in order to solve the above-mentioned problem, an amount representing the length of the yarn remaining in the spinning cup is detected, and depending on the length of the yarn remaining in the spinning cup, the tension is controlled in a closed loop. The empirical value for this adjustment signal is obtained from at least one adjustment signal detected during winding by the yarn, and when the sensor breaks down, the yarn tension is controlled by the yarn tensioner, so that the length of the yarn remaining in the spinning cup Depending on the above, the previously obtained experience value is used as the adjustment signal.

  With this method described in the present invention, it is possible to guarantee the operation of the working unit part in which the sensor fails or is damaged. By determining the empirical value obtained from the wind condition for operation, firstly the quality of the substitute value used in the event of a sensor failure is guaranteed. Secondly, high winder productivity is guaranteed. If a sensor fails, production will not be stopped and production will not be interrupted to obtain the above experience values. By obtaining the above empirical value depending on the amount of yarn remaining in the spinning cup, even if the sensor fails, the thread tensioner of the corresponding work unit section depends on the state of each in the work unit section. The adjustment signals can be individually adapted. Therefore, the winding quality of the twill package is still guaranteed even when the sensor has failed for a relatively long time.

  When the adjustment value of a plurality of work unit parts is detected to obtain the experience value, the quality of the substitute value can be further improved. In the optimum case, all adjustment signals of the operating work unit are detected.

  Advantageously, the yarn is unwound from a spinning cup with a known wound yarn length, and the length of the yarn unwound from this spinning cup is used as an amount representing the amount of yarn remaining in the spinning cup. use. The amount of the remaining yarn itself is not easy to determine during the winding operation. In contrast, the total amount of yarn in the spinning cup is often known anyway from the previous process, i.e. from the production in the ring spinning machine, or easily based on eg the cup weight and the specific yarn weight. Can be sought. A simple measuring method is known for obtaining the length of the unwinded yarn. If the spinning cups used have the same yarn amount, the unwinded yarn length can be used directly as a reference amount. It is not necessary to convert the length of the unwound yarn into the amount of remaining yarn.

  According to an advantageous embodiment of the method according to the invention, if the sensor of one work unit part fails, the above empirical value used for open-loop control of the yarn tension is determined before the sensor fails. Further, it is obtained from an adjustment signal detected while unwinding at least one spinning cup of the work unit section.

  Here, the empirical value used to open-loop control the yarn tension when a sensor of one work unit part fails is the last spinning of the work unit part before the failure of the sensor. It is obtained from the adjustment signal detected during the winding of the cup.

  The above empirical value used for open loop control of the yarn tension when a sensor of one work unit part fails is the average value of the adjustment signals of a plurality of spinning cups wound by this work unit part. It can also be expressed.

  According to another advantageous embodiment of the method according to the invention, the above empirical value used for open-loop control of the yarn tension in the event of a failure of a sensor in one work unit part is obtained from a plurality of the same lot. It is an average value of a plurality of adjustment signals in the work unit section.

  The above empirical value used for closed loop control of the yarn tension when a sensor in one work unit part fails shall be the average value of all adjustment signals detected by multiple work unit parts in the same lot. Is possible.

  The above empirical value used for closed loop control of the yarn tension in the event of a failure of one work unit sensor, alternatively, when each last cup is taken up in a plurality of work unit parts of a lot. It is possible to use the average value of a plurality of adjustment signals detected in step (b).

  Advantageously, the above failure of the sensor is indicated. As a result, information is notified to the operator, and means for removing the failure can be executed.

  As explained at the beginning, during winding with a closed loop yarn tension, it is advantageous to adjust the winding speed depending on the adjustment of the yarn tensioner because of the closed loop controlled yarn tension. During the above winding, depending on the length of the yarn remaining in the spinning cup, an empirical value for the winding speed is detected, and if the yarn tension sensor fails, it depends on the length of the remaining yarn. In addition to the adjustment signal for the tensioner, the empirical value for the previously determined winding speed is used to adjust the winding speed. Otherwise, there is a risk that the empirical value used for the adjustment signal of the yarn tensioner does not match the respective winding speed.

  In order to solve the above problems, a winder for carrying out the method according to the invention is proposed. The winder has a plurality of work unit portions each configured to wind the yarn from the spinning cup into a traverse package. Here, one sensor for measuring the amount representing the yarn tension and a yarn tensioner for giving the yarn tension to the yarn when the yarn is traveling are arranged, and control means for controlling the yarn tension in a closed loop is provided. ing. The control means compares the measured amount representing the yarn tension with a target value of the amount representing the yarn tension, and outputs an adjustment signal to the yarn tensioner to adjust the yarn tension depending on the comparison. Configured to generate. The control means is configured to open-loop control the yarn tension when the center fails. In the present invention, the control means is configured to detect the length of the yarn remaining in the spinning cup, and at least one adjustment signal detected during n winding with the yarn tension controlled in a closed loop. From the above, it is formed to obtain an empirical value for the adjustment signal, and if one sensor fails, the empirical value depends on the amount representing the length of the yarn remaining in the spinning cup. Is used as an adjustment signal to control the yarn tension on the yarn tensioner.

  In an advantageous embodiment, the control means include a work unit controller and / or a central control unit. Advantageously, the work unit controller of each work unit performs the closed loop control of the yarn tension and the detection of the adjustment signal to determine the experience value. Depending on whether the above experience value is obtained only from the adjustment signal of each work unit part or from the adjustment signals of a plurality of work unit parts of one lot, the above experience value is advantageously It is calculated | required by said work unit control part or a central control unit.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

  FIG. 1 shows a winder 1 having a number of work unit parts 2, where these work unit parts are arranged between the frame end parts 55, 56 of the winder 1. This winder has a central control unit 50, and this central control unit is connected to the work unit control unit 40 via a bus system 60. The central control unit has a keyboard 52 and a display 51 for operation and display.

  FIG. 2 schematically shows a side view of the work unit 2 during the winding process. In this working unit 2 which is known and therefore not described in detail, the supply-side bobbin, which is a spinning cup 9 which is usually produced on a ring spinning machine and has a relatively small amount of yarn material, is rewound into a large-capacity winding package 11. It is. The produced traverse package 11 is subsequently passed to the traverse package transport device 21 in the machine longitudinal direction using the service unit 57 that operates automatically, for example, using the traverse package changer, and is applied to the end surface of the machine. Delivered to the arranged bobbin loader or the like.

  Such a winder 1 is further equipped with a circular magazine capable of pre-storing spinning cups, or the above-mentioned automatic winding package has a logistic device in the form of a reel and bobbin transport system 3. In such a reel and bobbin transport system 3, the spinning cup 9 or the empty bobbin 34 rotates. These are arranged on the transport plate 8 in a vertical orientation. Of the bobbin transport system 3, only the cup supply section 4, the storage section 5 that can be driven in reverse, the lateral transport section 6 that follows the work unit section 2, and the bobbin return section 7 are shown. Yes. As shown in the drawing, the delivered spinning cup 9 is first positioned at the winding position 10 and subsequently rewound. Here, the winding position is provided in a region of the lateral conveyance section 6 of the work unit section 2.

  For this purpose, the individual work unit parts 2 have different yarn monitoring and processing devices, as is known and therefore only briefly shown. This device not only ensures that the spinning cup 9 is rewound into the large capacity traverse package 11, but also ensures that the yarn 30 is monitored so that no yarn defects occur during the rewound process and The detected yarn defects are removed. Each work unit section 2 has a work unit control section 40, which is connected to the above-described yarn monitoring and processing apparatus via a control line which is only shown in a simplified manner, and is a bus system. The central control unit 50 and the control unit 58 of the service unit 57 are connected to each other through the control unit 60.

  Each of the work unit portions 2 is provided with, for example, a wind device 24 having a winding frame 18, where the winding frame is supported so as to move around a rotation axis 19, and A wind drive device 26 and a yarn traverse device 28 are provided.

  In the illustrated embodiment, during the winding process, the traversed package 11 has its surface resting on the drive roller 26 and is moved together by this roller via friction torque. Here, a force is applied to the drive roller 26 via a drive device (not shown) that can control the rotation speed and can rotate in the reverse direction.

  The yarn 30 is traversed when the traverse package 11 is inflated by a yarn traversing device 28, which has a finger type yarn guide 29 in this embodiment.

  Furthermore, the working unit 2 advantageously has a cutting device 43 and a splicing device 13 that operates pneumatically, a yarn connecting device, a lower yarn sensor 22, a yarn tensioner 14, and a yarn cutting device 17. A cleaner 15, a yarn tension sensor 20, and a paraffin processing device 16 are included.

  Further, the work unit section 2 is provided with a suction nozzle 12 and a grip tube 25, to which a predetermined negative pressure can be applied. The suction nozzle 12 and the grip tube 25 are connected to a negative pressure beam 32 in the machine longitudinal direction, and the negative pressure beam itself is connected to a negative pressure source 33.

  In the illustrated embodiment, a yarn collecting nozzle 23 is also positioned in the area of the paraffin processing unit 16 which is arranged slightly behind the yarn travel path, so that the yarn 30 is taken up by the winding process. Drive in front of the opening 42. The yarn collecting nozzle 23 is also connected to the negative pressure beam 32 through the air branch path 27. Here, the air branch path 27 has a connection pipe part 35 for the yarn collecting nozzle 23 and a relatively bulky release pipe part 36, and the opening is in a standby position during normal winding operation. The suction nozzle 12 positioned at P is hermetically closed. When the release pipe portion 36 is opened by rotating the suction nozzle 12 greatly, the negative pressure applied to the yarn collecting nozzle 23 is released.

  In normal winding operation with no error, the yarn tension is closed-loop controlled in each work unit. This closed loop control is schematically illustrated using a block diagram in FIG. In this embodiment, a target value v for the yarn pulling force is set in advance. This target value can be set in advance for one lot by an operator near the central control unit 50, for example, and the work unit control unit 40 of the work unit unit 2 belonging to this lot by the bus system 60. Can be notified. The actual value y of the yarn tension force is measured by the yarn tension force sensor 20. In order to compare the target value v with the actual value y, the difference e between these quantities is determined. For this purpose, the measured actual value y and target value v having a negative sign are supplied to the adder 48. The difference e thus obtained is an input signal to the controller 45, and an adjustment signal u for the yarn tensioner 14 is supplied by this controller. The comparator and controller 45 having the adder 48 is part of the work unit controller 40 in this embodiment. However, basically, it is also possible to realize the closed loop control unit in the central control unit. The block 46 connected downstream from the thread tensioner 14 in the block diagram of FIG. 3 is referred to as a section in the control technique. Here, the section 46 includes a plurality of portions of the above-mentioned work unit portion, and these portions act on the traveling yarn with a predetermined yarn tension or yarn tension force under the influence of the yarn tensioner. It is also possible to use yarn tension instead of yarn tension as a target value or measured actual value. In some cases, it is necessary to convert the above-described yarn tension into a yarn tension force or vice versa.

  FIG. 4 illustrates the operation of the closed loop control described above. Here, the adjustment signal for the yarn tensioner 14 is plotted on one side and the target value v or actual value y of the yarn tension is plotted on the other side in terms of time or the length of the yarn wound from the spinning cup. Since a constant winding speed is assumed here, the length of the wound yarn is proportional to time. Furthermore, since the ideal closed-loop control with no steady control deviation is used as a whole here, the target value v and the actual value y are the same. Furthermore, the control signal u is proportional to the tensioner pressure applied by the yarn tensioner. In order to maintain a constant yarn tension, a relatively high tensioner pressure is required initially. Also, the smaller the amount of yarn remaining in the spinning cup, or the longer the wound yarn, the lower the tensioner pressure must be adjusted to maintain a constant yarn tension. Therefore, when the tensioner pressure is constant, the yarn pulling force increases with the length of the wound yarn.

  The winding speed need not remain constant throughout the cup movement as described above. If the above-mentioned yarn tensioner cannot further reduce the above-mentioned pressure, the above-described winding speed is reduced stepwise so that closed-loop control of the yarn tension force is again possible with the yarn tensioner as the adjusting element. To do. In the block diagram of FIG. 3, the influence of the change in the winding speed due to the disturbance amount d is symbolically represented.

  During normal winding operation, the adjustment signal u of the yarn tensioner 14 is detected and stored depending on the length of the yarn wound from each spinning cup. In addition, the respective winding speed is stored together. These values can be stored in the storage unit of the work unit controller or the storage unit of the central control unit in a network fail safe manner. This storage can be performed in the form of a table, for example. In this case, the table associates the length of the wound yarn with the adjustment signal u and the value for the winding speed. Here, the length of the wound yarn corresponds to the predetermined amount of yarn remaining in the spinning cup. The length of the wound yarn can be obtained from the rotation of the driving roller 26 as is known, for example. For this purpose, the rotation of the driving roller 26 is detected and stored in the counter. This counter in this case must be reset every time the spinning cup is changed. The number of rotations is proportional to the length of the wound yarn. This value can be directly associated with each value of the adjustment signal. There is no need to convert the yarn length based on the drive roller diameter. The value for the adjustment signal determined and stored in this way already represents the experience value according to the invention. Subsequent processing of these values can lead to unique experience values in some cases. For this purpose, an average value of a plurality of adjustment signal values corresponding to the length of the wound yarn can be formed. Therefore, for example, an average value of a plurality or all of the spinning cups 9 of one lot wound in the work unit section 2 can be obtained and stored in the table accordingly. It is also possible to use the average value of all or a plurality of work unit parts 2 of one lot. For this purpose, it is advantageous to notify the central control unit 50 of the value detected in the work unit 2 if it has not been done yet. In this case, the average value of all the spinning cups 9 in this lot or the average value of the last spinning cup 9 in each of a plurality of or all winding points of this lot can be obtained. This average value is then stored accordingly in the table. Here, each value of the length of the wound yarn is associated with the average value of the adjustment signal.

  As soon as a failure of the yarn tension sensor 20 of the work unit 2 is confirmed by the work unit controller 40, the thread tension is automatically changed from the closed loop control to the open loop control in the corresponding work unit 2, that is, an operator intervention. Switch to None. At the same time, an error notification corresponding to the display 51 of the central control unit 50 is displayed. Such control is shown schematically in FIG. Block 47 represents a storage device in which the above-described experience values are stored in the form of a table. In the table, the length of the wound yarn is associated with one value for each of the adjustment signals. Depending on which experience value is used, the storage device 47 of the work unit controller 40 or the central control unit 50 can be associated. The adjustment signal u obtained based on the length of the yarn wound from the spinning cup and the above table is then supplied to the yarn tensioner 14. In addition, the winding speed is set to the value stored in the above table. By the section 46, the actual value y of the yarn tension is formed. The actual value y is close to the target value v, although the yarn tension is not controlled by the closed loop but by the open loop.

  DESCRIPTION OF SYMBOLS 1 Winder, 2 Work unit part, 3 Reel and bobbin conveyance system, 4 Cup supply area, 5 Accumulation area, 6 Lateral conveyance area, 7 Bobbin return area, 8 Conveyance plate, 9 Spinning cup, 10 Winding position, 11 Aya Winding package, 12 suction nozzle, 13 splicing device, 14 yarn tensioner, 15 yarn cleaner, 16 paraffin processing device, 17 yarn cutting device, 18 winding frame, 19 swivel axis, 20 yarn tension sensor, 21 traverse package conveying device, 22 Lower thread sensor, 23 Thread collecting nozzle, 24 Winding device, 25 Gripping tube, 26 Driving roller, 27 Air branching path, 28 Thread traversing device, 29 Finger type thread guide, 30 Thread, 32 Negative pressure beam, 33 Negative Pressure source, 34 empty bobbins , 35 connection pipe section, 36 release pipe section, 40 work unit control section, 45 controller, 48 adder, 50 central control unit, 51 display, 60 bus system, y actual value, v target value, e difference, u adjustment signal

Claims (11)

A method of operating a winder (1) having a plurality of work unit portions (2) for winding one yarn (30) from a spinning cup (9) into a traverse package (11),
During running of the previous SL yarns (30), a sensor (20) of one of measuring the quantity representative of the yarn tension,
Yarn tensioner which gives the yarn tension before Symbol thread (30) and (14),
Is placed,
Measured quantity representative of the previous SL yarn tension and (y), the target value of the quantity representing the previous SL yarn tension and (v), comparing, in dependence said the comparison (e), to adjust the pre-Symbol yarn tension and closed-loop control the pre-Symbol yarn tension by producing an adjustment signal (u) for the previous SL yarn tensioner (14) to,
After confirming the failure of one sensor (20), in the pre-Symbol yarn tension open loop control to that way,
The amount representing the length of yarn remaining before Symbol spinning cop (9) respectively detected,
Depending on the length of the yarn that the remaining spinning cop (9), at least one adjustment signal has been detected during the winding due to a closed loop control yarn tension (u), experience with the adjustment signal (u) Find the value
If one sensor (20) has failed, for open loop control of the yarn tension by pre-Symbol thread tensioner (14), depending on the length of the yarn that remains before Symbol spinning cop (9), before to use the experience for the obtained pre SL adjustment signal (u) as an adjustment signal (u),
METHODS. To determine the previous SL experience, to detect the adjustment signals of a plurality of working units part,
The method of claim 1. Using the length of the wound yarn from the previous SL spinning cop (9), as an amount representing the amount of yarn the remaining spinning cop (9),
The method according to claim 1 or 2. One work unit part the previous SL experience values used for sensor (20) is open-loop control before Symbol yarn tension when failure (2), the same work before the sensor (20) fails Obtained from an adjustment signal detected during winding of at least one spinning cup (9) of the unit part,
The method according to claim 2 or 3. One work unit part the previous SL experience values used for sensor (20) is open-loop control before Symbol yarn tension when failure (2), the work before the sensor (20) fails From the adjustment signal detected during winding of the last spinning cup (9) of the unit part (2),
The method of claim 4. Before SL experience used to sensor (20) is open-loop control before Symbol yarn tension when failure of one of the working unit section (2) is wound by the working unit section (2) is the average value before Symbol adjustment signal (u) of the plurality of spinning cop (9),
The method of claim 4. One unit of work portion (2) of the sensor (20) before Symbol empirical values used to open-loop control the pre-Symbol yarn tension when has failed, a plurality of working units of the same lot in (2) An average value of a plurality of adjustment signals (u),
The method according to claim 2 or 3. One work unit section before Symbol empirical values used for sensor (20) is open-loop control before Symbol yarn tension when failure (2), a plurality of working units of the previous SL Lot (2) Is the average value of the plurality of adjustment signals (u) detected when the last spinning cup (9) is wound up,
The method of claim 7. Display a failure of the sensor (20),
9. A method according to any one of claims 1-8. During winding according to a closed loop control yarn tension was adjusted depending of the previous SL winding speed adjustment before Symbol thread tensioner (14),
Depending on the length of the yarn remaining before Symbol spinning cop, to detect the experience value for the take-up speed,
If the sensor (20) has failed, depending on the length of the pre-Symbol remaining yarns, it sets the previous SL winding speed using the previous SL experience for previously determined winding speed,
10. A method according to any one of claims 1-9. A winder having a plurality of work unit portions (2) configured to wind the yarn (30) from the spinning cup (9) into the traverse package (11),
During running of the previous SL yarns (30), a sensor (20) of one of measuring the quantity representative of the yarn tension,
Yarn tensioner which gives the yarn tension before Symbol thread (30) and (14),
Is placed,
Control means (40, 50) is provided for closed-loop control the pre-Symbol yarn tension,
Said control means measuring quantity representing the previous SL yarn tension and (y), the target value of the quantity representing the previous SL yarn tension and (v), comparing, in dependence said the comparison (e), before Symbol yarn Configured to generate an adjustment signal (u) for the thread tensioner (14) to adjust the tension;
Before SL control means (40, 50), prior Symbol sensor (20) is Ruwa inductor consists of pre Symbol yarn tension to open loop control in case of failure,
Before Symbol control means (40, 50) is,
For detecting the amount representing the length of yarn remaining before Symbol cop,
Depending on the amount representing the length of the yarn remaining on the spinning cop, at least one adjustment signal has been detected during the winding due to a closed loop control yarn tension (u), the experience value for said adjustment signal (u) Request for, and when the sensor (20) fails, before SL depending on the amount representing the length of the yarn remaining on the spinning cop (9), at least a portion of the adjustment signal before SL experience ( use as u), and is configured to thread tension for the previous SL yarn tensioner (14) so as to open loop control,
Winder for carrying out the method according to any one of the preceding claims.

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