EP3374547B1 - Method for monitoring quality during texturing, and texturing apparatus - Google Patents

Description

The invention relates to a method for quality control during texturing of a synthetic thread according to the preamble of claim 1 and to an apparatus for texturing a synthetic thread according to the preamble of claim 10.

A generic method for quality control during texturing and a generic device for texturing are from the EP 0 495 446 A1 known.

In order to match the properties of artificial textile threads to threads of natural fibers such as wool or cotton, it is known to finish the spun synthetic threads in a texturing process. The synthetic filament strands forming the thread are crimped to give the thread a more textile look and properties. In order to be able to produce such structures on the synthetic threads, the texturing process is submitted to partially stretched spun synthetic threads. In the texturing process, each thread is individually textured within a texturing zone and simultaneously stretched. For texturing, the threads preferably receive a false twist, which is fixed in the texturing zone by means of a heating device and a cooling device. After leaving the texturing zone, the so crimped yarn is wound up into a bobbin.

In order to produce as constant a thread quality as possible in the texturing process, it is customary to monitor the texturing process on the basis of a quality parameter. As a quality parameter, the thread tension of the guided in the texturing zone thread has proven. This is in the known method for quality monitoring, continuously measuring a yarn tension within the texturing zone on the already crimped yarn. The thread tension is monitored for its uniformity. The known device for texturing has for this purpose a yarn tension sensor which is arranged between a texturing unit and a second delivery roller. For measuring the thread tension usually mechanical means are used, which require an additional thread deflection in the yarn path. In principle, however, any mechanical intervention on the thread to produce a uniform crimping of the filaments within the thread to avoid. In that regard, alternative methods and devices are known in which the thread tension is monitored by the drives of the delivery rollers.

So goes out of the EP 1 067 224 A1 a method of quality control in texturing a synthetic thread, in which the supply rollers for guiding and drawing the thread are monitored and controlled. Thus, all speed information of the delivery rollers can be adjusted and regulated with regard to a desired thread tension. Alternatively, the moment loads of each delivery roller can also be detected and used for regulation.

This method thus requires a variety of quality parameters to monitor a texturing process. In addition, disturbances that do not affect the difference in the speed signals or moment load of the delivery rollers remain unrecognized.

It is an object of the invention to provide a method for quality control during texturing of a synthetic thread of the generic type as well as an apparatus for texturing a synthetic thread of the generic type, which allow process monitoring based on a quality parameter with low equipment costs.

Another object of the invention is to provide a generic method for quality monitoring during texturing and a generic device for texturing, in which both the stretching and the texturing of the thread can be monitored.

This object is achieved by a method for monitoring the quality of texturing a synthetic thread with the features of claim 1 and by a device for texturing a synthetic thread with the features of claim 10.

Advantageous developments of the invention are defined by the features and feature combinations of the respective subclaims.

The invention is based on the recognition that the delivery roller arranged on the outlet side of the texturing zone has a significant influence on the overall texturing process. Thus, on the one hand, the draw ratio is determined by the peripheral speed of the delivery roller and on the other hand, the thread is withdrawn from the texturing unit. In that regard, a drive of the delivery roller can be used to monitor the uniformity of the texturing process. According to the invention, an operating torque of the electric motor is thus detected as a quality parameter, which drives the supply roller for removing the thread from the texturing zone.

In the case of the device according to the invention, the monitoring device is connected to control electronics of an electric motor driving the second delivery roller, wherein the measuring device is integrated within the control electronics of the electric motor and designed such that an operating parameter of the electric motor can be detected as a quality parameter. Thus, by monitoring the operating parameter of the Electric motor to ensure a uniform thread quality during texturing. Since the thread guided by the delivery roller significantly affects the output of the electric motor, the operating torque of the electric motor is particularly suitable for monitoring the texturing process.

On the one hand to be able to assess the stability of the process and on the other hand to obtain a measure of the quality of the produced thread, the method variant is particularly advantageous, in which an actual value of the operating torque is compared with a stored limit value and / or a stored limit range of the operating torque and in which an overshoot or undershoot of the limit value and / or limit value range is detected. Thus, a limit value or a limit value range of the operating torque can be stored, which corresponds to a desired thread quality if it is adhered to.

Depending on the choice of the limit value or the limit value range, the overshoots or undershoots can be differently evaluated by the actual value of the operating torque. In a first variant of the method, if the limit value and / or limit range is exceeded or undershot, a difference value of the operating torque between the actual value and the relevant limit value is determined and a signal generation and / or a process change is initiated as a function of the size of the difference value. Absolute value differences can thus be used directly for process control.

In an alternative or additional method variant, a time duration of the overshoot or undershoot is determined when the limit value and / or limit range is exceeded or undershot, wherein the time duration is compared with a limit duration, and when the limit duration is reached a signal generation and / or a process change initiated becomes. Thus, for example, signs of wear on the texturing unit can be identified.

Another alternative method variant is often used to make a quality rating of the yarn produced. Thus, the overshoot or undershoot of the limit value or limit value range can be detected by an actual value as a disturbance event. The disturbance events are added up to a number of disturbances, whereby signal generation and / or a process change is initiated when a marginal disturbance number is reached. This variant of the method can also be used preferably to define maintenance cycles on the units.

Depending on the type of electric motor and the coupling with the delivery roller, it is also possible to average the actual values of the operating torque recorded within a measuring time period and to compare the averaged actual value of the operating torque with the limit value or limit value range. This can advantageously be compensated for short-term interference in the determination of the actual value.

Since the operating torque of the electric motor is also affected by the bearing friction of the delivery roller, a regular balance between an idling target value and the idling actual value of the operating torque is required. For this purpose, the process variant is preferably carried out, in which prior to a process start the supply roller is driven by the electric motor without thread, in which an idle actual value of the operating torque is detected and in which the idle actual value of the operating torque with a predetermined idle setpoint of Operating torque is compared. In the case of excessive deviations between the idle actual value and the idling nominal value, the idling actual value of the operating torque is alternatively determined and stored as a reference nominal value.

The stored reference set point of the operating torque can then be used to be converted with a stored tolerance value and / or tolerance value range to the limit value and / or limit value range of the operating torque. This ensures that possible disruptive parameters such as bearing friction or air resistance at the delivery roller can be neutralized.

In a further advantageous variant of the method, instead of the second delivery roll, the first delivery roll is used for determining and monitoring the quality pairing meter. Thus, the thread tensions of the thread built up within the texturing zone also act on the drive of the first delivery roll. Especially with larger yarn tiers and higher draw forces, the operating torque of the electric motor of the first supply roll is detected and monitored instead of the operating torque of the electric motor of the second supply roll.

The provided in the control electronics of the electric motor measuring means for monitoring the operating parameter is preferably designed as an ammeter for measuring a motor current. For an indirect detection of the operating torque is possible.

In order to compare an actual value of the operating torque with a limit value and / or a limit value range, the device according to the invention is designed such that the monitoring device has at least one storage means and one evaluation unit, wherein the evaluation unit can be loaded with several evaluation algorithms.

In order to allow intervention or registration by an operator in the event of inadmissible exceeding of the limit values or limit ranges, it is necessary Furthermore provided that the monitoring device is connected to a machine control unit, with a visualization unit and / or a signal output unit. Depending on the degree of overshoot or undershoot of the limit value, direct intervention in the process can be initiated via the machine control unit. It is also possible, for example, to continuously supply the number of disturbing events in one of the visualization unit. Moreover, it is also possible to display the current state of the texturing process at the relevant processing point by the signal generator unit, for example, by differently colored diodes.

For the provision and monitoring of the quality parameter, in particular, the device variant has proved successful, in which the electric motor is formed by a brushless synchronous motor (BLDC motor), the control electronics being integrated within the synchronous motor. Thus, a sensitive detection of the operating torque is possible directly in the vicinity of the electric motor.

Thus, the monitoring device with its electronic parts can also be advantageously integrated into the control electronics as an electric motor.

In certain processes, the drive of the first delivery role is used instead of the drive of the second delivery role for process monitoring. For this purpose, the monitoring device is connected only to an electronic control unit of the first supply roller driving electric motor, wherein the control electronics of the electric motors of both drives are identical.

The inventive method for monitoring the quality of texturing a synthetic thread and a device for texturing a synthetic thread are described below with reference to some embodiments of the Device according to the invention with reference to the accompanying figures explained in more detail.

Fig. 1

schematisch ein erstes Ausführungsbeispiel der erfindungsgemäßen Vorrichtung zum Texturieren eines synthetischen Fadens

Fig. 2

schematisch ein Ausführungsbeispiel einer Lieferrolle des Ausführungsbeispiels aus Fig. 1

Fig. 3

schematisch eine Diagrammdarstellung eines zeitlichen Verlaufs eines Ist-Wertes des Betriebsdrehmomentes Elektromotors

Fig. 4

schematisch eine Diagrammdarstellung eines zeitlichen Verlaufs eines Ist-Wertes des Betriebsdrehmomentes vom Elektromotor

They show:

Fig. 1

schematically a first embodiment of the inventive device for texturing a synthetic thread

Fig. 2

schematically an embodiment of a delivery role of the embodiment Fig. 1

Fig. 3

schematically a diagram of a time course of an actual value of the operating torque electric motor

Fig. 4

schematically a diagram of a time course of an actual value of the operating torque from the electric motor

In the Fig. 1 schematically an embodiment of the inventive device for texturing a synthetic thread is shown. Usually, such devices have a plurality of parallel juxtaposed processing points, which are arranged side by side along a machine longitudinal side. For example, more than two hundred processing points and winding units can be held within a texturing machine. In the Fig. 1 schematically a construction of one of the processing points of such a device is shown by way of example.

It is first provided a presentation point 1, in which a supply spool 2 and a reserve coil 3 are held. The supply spool 2 supplies a thread 5, which is withdrawn via a thread guide 4 from the presentation point 1.

The withdrawal of the thread 5 from the supply spool 2 is effected by a first delivery roller 6. The delivery roller 6 is driven by an electric motor 8.1, which has an electronic control unit 45. The delivery roller 6 is one by far associated with rotatable axletrap 7, so that the thread 5 with several wraps on the delivery roller 6 is feasible.

In the further course of the thread follows a heating device 10, a cooling device 11 and a texturing unit 12. The texturing unit 12 is driven by a texturing drive 13. The texturing unit 12 is preferably designed as a friction twist generator in order to produce a false twist on the thread 5.

To stretch the thread, the texturing unit 12 is followed by a second delivery roller 14, which is driven by the electric motor 8.2. The second delivery roller 14 is also associated with a freely rotatable axillary role in the distance in order to be able to perform the thread 5 with several wraps around the circumference.

The thread path between the first delivery roller 6 and the second delivery roller 4 forms the so-called texturing zone 9. Within the texturing zone 9, the thread 5 is thus textured and stretched at the same time. After the treatment of the thread 5 of this the winding unit 15 is supplied.

The winding unit 15 has in this embodiment, a coil holder 18 which carries a coil 19. The coil holder 18 is designed to be pivotable. The coil holder 18 is associated with a drive roller 20 which is driven by a roller drive 21. For laying the thread on the circumference of the spool 19 of the winding unit 15 is associated with a traversing unit 16, which has a drivable traversing yarn guide. The traversing yarn guide is for this purpose driven by the traversing drive 17. The traversing unit 15 can for this purpose have a belt connected to the traversing yarn guide or a counter-rotating thread.

In the Fig. 1 The device shown is shown in an operating state. During operation, a quality parameter is continuously monitored to obtain uniform texturing and drawing of the thread. For this purpose, a monitoring device 23 is provided, which is coupled to the electric motor 8.2 of the second delivery roller 14. The monitoring device 23 has a storage means 24 and an evaluation unit 25.

The electric motor 8.2 has an electronic control unit 31, which contains a measuring means not shown here in detail for detecting an operating parameter of the electric motor 8.2. The control electronics 31 is connected directly to the monitoring device 23.

The monitoring device 23 is connected to a machine control unit 22. The machine control unit 22 is connected to the drives 8.1, 13, 17 and 21 to control the processing station.

The engine control unit 22 and the monitoring device 23 are connected in parallel with a visualization unit 26. The visualization unit 26 is linked to a control panel, so that an operator can intervene directly in the process via the visualization unit 26.

The monitoring device 23 is connected via a signal line to a signal generator unit 27. The signal transmitter unit 27 has a plurality of light-emitting diodes, which can shine, for example, in different colors.

In operation, at the in Fig. 1 shown device of the thread 5 withdrawn by the first supply roller 6 of the supply spool 2 and conveyed into the texturing zone 9. Within the texturing zone 9, the thread 5 is given a false twist by the texturing unit 12, which counteracts the thread running direction propagates so that the twisted filaments within the heater 10 are heated and then fixed in the cooling device 11. At the end of the texturing zone, the thread 5 is pulled out of the texturing zone 9 by the second delivery roller 14. The peripheral speeds of the supply rollers 6 and 14 are set at a differential speed so that the yarn is stretched within the texturing zone 9.

The thus curled thread 5 is then wound in the winding unit 15 to the coil 18.

During operation, an operating parameter is detected by the control electronics 31 of the electric motor 8.2, which reflects the state in particular the load of the delivery roller 14. The control electronics 31 has for this purpose measuring means to continuously detect, for example, the recording of a motor current. For example, an instantaneous operating torque of the electric motor 8.2 can be detected from the rotational speed and the motor current. The thus detected actual value of the operating torque from the electric motor 8.2 is transmitted to the monitoring device 23. Within the monitoring device 23, an actual target comparison of the operating torque takes place in order to be able to assess the instantaneous operating state of the texturing.

The actual value of the operating torque can be used here as a pure absolute value or as a relative value. Thus, when relative values are used, the actual value of the operating torque for a trouble-free course of the texturing process could be defined as 100%. A deviation of the actual value curve of the operating torque would then be defined with a percentage deviation. For example, a deviation could be 5% or 10% above or below the relative 100%. The monitoring of the texturing process is thus independent of whether the display shows the actual value curve the operating torque of the monitored electric motor is displayed with absolute values or relative values.

In Fig. 3 an embodiment of a monitoring of the operating torque of the electric motor 8.2 is shown by way of example in a diagram. The Fig. 3 has a coordinate system in which on the ordinate the operating torque M and on the abscissa the time t is entered. The operating torque recorded during operation is entered with its actual values in the diagram, so that over time an actual value curve is established. The actual value curve of the operating torque is in Fig. 3 marked with the letters M _I.

The actual values M of the operating torque are compared with an upper limit of the operating torque. The limit value of the operating torque is in Fig. 3 marked with the code letter M _G. The course of the limit value M _G is parallel to the time axis t.

During the texturing and stretching of the thread 5, different moment loads are now detected on the second delivery roller 14. Such fluctuations can result, for example, by so-called node overruns or by signs of wear or other external interference. In Fig. 3 For this example, several exceedances of the limit are shown.

In the event that the current actual value M of the operating torque exceeds the predetermined limit value M _{G of} the operating torque, various evaluation algorithms can be performed to initiate actions. In a first variant, the number of limit violations is registered. Thus every exceeding of a limit value represents a disturbance event, which represents an inadmissible deviation from the production process. The Interference events are in Fig. 3 marked with the key figures I, II, III and IV. For example, the disturbance events can be added up in a predetermined time interval. The interference events that occur per time interval can thus be used as a measure of a thread quality. However, it is also possible to initiate an immediate signal generation or even a process change when exceeding a Grenzstöranzahl.

Another variant of the evaluation of the exceeding of limits is given by the time duration of exceeding the limit is detected. In Fig. 3 For this purpose, an initial time with t ₁ and an end time with t _{2 is} entered as an example for the disturbance event with the characteristic number II. The time period resulting from the times t ₁ -t ₂ is then compared to a limit period. In the event that the limit duration has been reached, a signal generation or a process change can be initiated immediately. Basically, both activities can be performed simultaneously, so that for example takes place at the signal generator unit 27, a color change to the light emitting diodes and a process change is requested in parallel via the visualization device 26.

Another possibility of evaluating the exceeding of the limit value is given therein in which the absolute limit value violation is determined. For this purpose, a difference value is determined from the maximum actual value of the operating torque and the limit value of the operating torque. In Fig. 3 For the disturbance event II, the absolute difference value of the operating torque is marked with the code letter ΔM. Depending on the size of the difference value .DELTA.M, a signal generation or process change can also be initiated. For this purpose, for example, a maximum permissible difference value of the operating torque could be specified. Thus, the texturing process can advantageously be monitored by simple means without additional sensors.

In order to obtain a high integration between the monitoring device 23 and the control electronics 31 of the electric motor 8.2, in particular the brushless synchronous motors have proven to be known as BLDC motors. In Fig. 2 For this purpose, an embodiment of the supply roller 14 is shown in a cross-sectional view. The delivery roller 14 has a pot-shaped godet casing 28, which is non-rotatably attached to a cantilevered free end of a motor shaft 29 of the electric motor 8.2. The electric motor 8.2 is designed as a brushless synchronous motor. The motor unit 44 thus comprises the electric motor 8.2 and control electronics 31. The motor unit 44 is designed in several parts in this embodiment. The motor shaft 29 of the electric motor 8.2 is rotatably supported in a bearing housing 30 by a plurality of rolling bearings 35. The motor shaft 29 has an opposite end to the godet 28, on which a rotor 32 is arranged. The rotor 32 is formed by a permanent magnet not described here. The rotor 32 is surrounded by a stator 33 which carries a plurality of windings. The stator 33 is held by a motor bracket 34. The motor mount 34 extends between the bearing housing 8 and an electrical housing 36 arranged directly on the electric motor 8.2. The electrical housing 36 contains the control electronics 31.

The control electronics 31 is symbolically represented in this embodiment by a circuit board 37 and a power module 38, an inverter 40 and a microprocessor 41. In particular, the control electronics 5 a measuring means 39, which is usually associated with the inverter 40. Furthermore, a memory means 24 is provided, which is coupled to the microprocessor 41.

The control electronics 31 is coupled via a supply line 43 with a voltage source, not shown here. A second connection to the control electronics 31 is a data line 20, the data and Signal exchange with the higher-level machine control unit 22 allows. In addition, the control electronics 31 may still be connected to the signal generator unit 27 and the visualization unit 26.

At the in Fig. 2 illustrated embodiment, the functions of the monitoring devices are integrated within the control electronics 31. Thus, the microprocessor 41 in this embodiment forms the monitoring device 23. The microprocessor 41 is designed to be programmable, so that both evaluations and control signals can be generated.

At the in Fig. 2 illustrated embodiment of the delivery roller 14, the measuring means 39 is preferably designed as a current meter. In order to determine an actual value of the operating torque, in this exemplary embodiment a motor current is measured as a motor parameter. In principle, however, other operating motor parameters such as the motor voltage can be used to determine operating parameters of the electric motor. The actual value of the operating torque is continuously compared with a threshold or a threshold range of the operating torque.

In Fig. 4 is a diagram representation of an actual value curve of the operating torque of the electric motor 8.2 exemplified within a threshold range shown. In the diagram in Fig. 4 the operating torque M of the electric motor 8.2 is plotted on the ordinate and the time t is plotted on the abscissa. The actual values of the operating torque during the texturing process are identified by the code letter M _I. In this case, the actual values of the operating torque are observed in a threshold range between an upper limit and a lower limit. The upper limit value is marked with the code letter M _OG and the lower limit value with the code letter M _UG . In that regard, a course of the actual value desired operating torque, which is between the upper limit M _OG and the lower limit M _UG behaves.

In the Fig. 4 is a start of operation at a time t ₁ shown schematically. For this purpose, first the delivery roller 14 at the in Fig. 1 illustrated embodiment performed without thread. In this situation, an idle actual value of the operating torque sets. The idle actual value of the operating torque is in Fig. 4 marked with the code letter M _L. Only after the yarn is applied to the aggregates of the texturing zone and is conveyed by the delivery roller 14, the load of the supply roller 16 increases and the operating torque of the electric motor 8.2 occurs with its actual value even above the upper limit M _OG .

The subsequent observation and evaluation of the limit value exceedances are analogous to the previous embodiment Fig. 3 analyzed. Here, the underruns of the lower limit M _UG can be analyzed and evaluated analogously.

The right half of the picture in Fig. 4 shows a special case in the observation of the actual value of the operating torque. In this case, approximately the instantaneous actual value of the operating torque M _{L is} reached at time t ₂ . This condition occurs at a thread break. In that regard, thread breaks in the texturing zone can be detected directly by monitoring the operating torque of the electric motor 8.2 of the delivery roller 16.

To compensate for the disturbance parameters such as bearing friction and air resistance at the delivery roller 14 in the monitoring of the operating torque, a so-called empty run is performed at regular intervals before a process start. For this purpose, the delivery roller 14 is driven without thread via the electric motor 8.2. In this state, an idle actual value of the Operating torque measured. The idle actual value is then compared with a predetermined idling target value of the operating torque. In the event that an impermissible deviation between the idle actual value of the operating torque and the predetermined idling target value of the operating torque is detected, the new idle actual value is determined as a reference target value and stored in the system. This reference setpoint value of the operating torque is used to redetermine the limit value or the limit value range. For this purpose, a tolerance value or a tolerance value range is stored, which together with the reference nominal value results in the new limit values. This ensures, when monitoring the texturing process, that essentially no interfering influences affect the measured values.

As from the illustration in Fig. 1 As can be seen, in the texturing process on the synthetic thread in addition to a crimping also carried out a stretching. Thus, a speed difference is set between the driven supply rollers 6 and 14, which causes a stretching of the thread 5 within the texturing zone 9. The uniformity of the texturing process thus affects both the drive 8.2 of the delivery roller 14 and the drive 8.1 of the delivery roller 6. In particular, in processes for texturing threads with larger thread tedders, the monitoring of the texturing process can also be carried out advantageously by monitoring the operating torque of the electric motor 8.1 of the first delivery roller 6. Thus, instead of the control electronics 31 of the electric motor 8.2, the monitoring device 23 is connected directly to the control electronics 45 of the electric motor 8.1 of the first delivery roller. For this purpose, the electric motor 8.1 and in particular the control electronics 45 are identical to the control electronics 31 and the electric motor 8.2 of the second supply roller 14. The electric motor 8.1 and the control electronics 45 thus have a structure as shown in FIG Fig. 2 on. The description to the Fig. 2 thus also applies to the electric motor 8.1 and the control electronics 45, which drives the first delivery roller 6. The monitoring of the operating torque of the electric motor 8.1 can be carried out analogously to the previously described monitoring of the electric motor 8.2.

The method according to the invention and the device according to the invention enable a process monitoring of the texturing process with simple but effective means on the basis of an operating parameter of the electric motor. There are no additional sensor devices needed in the yarn path.

Claims (16)

1. A method for monitoring quality when texturing a synthetic thread, in which the thread is drawn off from a supply package and within a texturing zone is drafted and textured, wherein the thread is drawn from the texturing zone by means of a driven delivery roller, and in which a quality parameter is continuously detected and monitored, characterized in that an operating torque of the electric motor, which drives the delivery roller for drawing off the thread from the texturing zone is detected as the quality parameter.
2. The method as claimed in claim 1,
   characterized in that
   an actual value of the operating torque is compared with a stored limit value and/or a stored limit value range of the operating torque, and in that any overshooting or undershooting of the limit value and/or of the limit value range is detected.
3. The method as claimed in claim 2,
   characterized in that
   in any overshooting or undershooting of the limit value and/or of the limit value range, a differential value of the operating torque between the actual value and the respective limit value is determined, and in that, depending on the magnitude of the differential value, a signal generation and/or a process modification is initiated.
4. The method as claimed in claim 2 or 3,
   characterized in that
   in any overshooting or undershooting of the limit value and/or of the limit value range, a temporal period of the overshooting or undershooting is determined, in that the temporal period is compared with a limit temporal period, and in that a signal generation and/or a process modification is initiated when reaching the limit temporal period.
5. The method as claimed in one of claims 2 to 4,
   characterized in that
   the overshooting or undershooting of the limit value and/or of the limit value range is detected as a disturbance, in that the disturbances are added up to give a disturbance number, and in that a signal generation and/or a process modification is initiated when reaching a limit disturbance number.
6. The method as claimed in one of claims 1 to 5,
   characterized in that
   the actual values of the operating torque that are detected within a measurement temporal period are averaged, and in that the averaged actual value of the operating torque is compared with the limit value and/or the limit value range.
7. The method as claimed in one of claims 1 to 6,
   characterized in that
   prior to a process start-up the delivery roller without a thread is driven by the electric motor, in that an idling actual value of the operating torque is detected, and in that the idling actual value of the operating torque is compared with a predefined idling nominal value of the operating torque, or is specified and stored as a reference nominal value of the operating torque.
8. The method as claimed in claim 7,
   characterized in that
   the stored reference nominal value of the operating torque by way of a memorized tolerance value and/or tolerance value range is converted to the limit value and/or the limit value range of the operating torque.
9. The method as claimed in one of claims 1 to 8,
   characterized in that
   the operating torque of the electric motor of the first delivery roller is monitored instead of the operating torque of the electric motor of the second delivery roller.
10. An apparatus for texturing a synthetic thread, having a supply position (1) for receiving a supply package (2), having a first delivery roller (6), having a heating installation (10), having a cooling installation (11), having a texturing device (12), having a second delivery roller (14), and having a monitoring installation (23) which has at least one measuring means (39) for detecting a quality parameter,
    characterized in that
    the monitoring installation (23) is connected to an electronic control circuit (31) of an electric motor (8.2) that drives the second delivery roller (14), in that the measuring means (39) is integrated within the electronic control circuit (31) of the electric motor (8.2) and configured in such a manner that an operating parameter of the electric motor (8.2) an operating torque, is detectable as the quality parameter.
11. The apparatus as claimed in claim 10,
    characterized in that
    the measuring means (39) has at least one ampere meter for measuring a motor current.
12. The apparatus as claimed in claim 10 or 11,
    characterized in that
    the monitoring installation (23) has at least one storage means (24) and one evaluation unit (25), wherein a plurality of evaluation algorithms are upload able to the evaluation unit (25).
13. The apparatus as claimed in one of claims 10 to 12,
    characterized in that
    the monitoring installation (23) is connected to a machine control unit (22), to a visualization unit (26), and/or to a signal generator unit (27).
14. The apparatus as claimed in one of claims 10 to 13,
    characterized in that
    the electric motor (8.2) is formed by a brushless synchronous motor (BLDC motor) (44), wherein the electronic control circuit (31) is integrated within the synchronous motor (44).
15. The apparatus as claimed in claim 14,
    characterized in that
    the monitoring installation (23) is formed by a microprocessor (41) which is integrated within the electronic control circuit (31) of the electric motor (8.2).
16. The apparatus as claimed in one of claims 10 to 15,
    characterized in that
    the monitoring installation (23) is connected to an electronic control circuit (45) of an electric motor (8.1) that drives the first delivery roller (6) instead of to the electronic control circuit (31) of the electric motor (8.2) that drives the second delivery roller, wherein the electronic control circuits (31, 45) are configured so as to be identical.

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