EP0644282B1 - Procedure for quality control during fabrication of a plurality of yarns - Google Patents

Description

The present invention relates to a method for quality control in the production of a large number of threads in a corresponding number of mutually identical production sites.

For the production of man-made fiber threads, systems are generally used which consist of a large number of similar manufacturing sites, in which process steps of the same type and which take place simultaneously are implemented. Each of the similar processes is determined by a large number of influencing variables, the sum of which defines the quality of the thread produced in the respective manufacturing site.

A method for quality monitoring in the production of a large number of threads is known from EP 0 439 106 A1. In the production of a synthetic thread by texturing by means of false twisting, the individual production site is monitored in that the reference signal is obtained from the measurement of process parameters of a large number of production sites.

The simplest form of evaluation consists in forming a cross-section that evaluates all manufacturing sites equally. A statement about the cross section of all manufacturing sites is then made the quality of the overall process or the product. However, this statement is not necessarily correct as an absolute quantity, but depends on the condition of the manufacturing sites. If the course of the process is shifted uniformly in all manufacturing locations relative to the actually intended state, there are no significant deviations between the manufacturing locations in the cross-sectional formation. As a result, the uniformity of the cross section appears as an indication of the presence of the desired process, but the overall process itself runs in an undesired manner.

The aim of the present invention is to provide a method in which the production processes can be controlled as uniformly and equally well as possible at all points in a multi-digit textile machine with justifiable measurement and evaluation effort.

The aim of the invention is achieved with a method having the features of claim 1. Advantageous refinements of the method are specified in the subclaims.

The further development according to the invention represents the comparison of the process parameters (measured values) in all manufacturing points with a so-called reference point, the process flow of which is assumed to be representative of an optimally set process flow. In doing so, an attempt is made to influence the process parameters at this reference point in a targeted manner in order to approach the intended course of the process. By comparing the common process parameter of each individual point with the reference point, one can then conclude how close the actual process flow comes to the intended process flow and determine a quality signal for evaluating the threads produced. All manufacturing sites are also controlled uniformly with regard to the decisive parameters.

The reference value at which an expected deviation in the thread quality is predetermined is obtained from the manufacturing site concerned. As an alternative to this, the control signal serves as the reference value, by means of which the decisive process parameter of the reference point is regulated. Both alternatives ensure a time-related statement about the process control at the individual manufacturing site.

By restricting the process monitoring at the reference point to only one process parameter (often the course of the thread tension), however, the actually possible quality of the process monitoring is not achieved, which results from the knowledge of the dependencies of individual process parameters and the technological possibilities of measurement from the evaluation of further process parameters would actually win.

By measuring many of these influencing variables at each reference point, it is possible with sufficient accuracy to record the state of the overall process and to influence it in relation to the quality of the threads produced.

The effort required to measure the process variables and to evaluate the process data obtained increases with the number of reference points. However, if all the relevant process variables are determined on a textile machine with 216 manufacturing sites, for example, the same amount of equipment is required for all manufacturing sites and the data from all 216 manufacturing sites are to be processed simultaneously. The costs required for this are practical Application not to be represented. However, the restriction to one or a few reference points considerably reduces the expenditure on equipment.

In one exemplary embodiment of the invention, a method for quality control in the production of a large number of threads in a corresponding number of mutually identical production sites is specified, the method being applicable in the textile machine irrespective of the type of production or further processing actually present.

All manufacturing points of the system are equipped with measuring devices with which at least one signal can be continuously recorded via measured variables which are particularly meaningful for the process of the respective manufacturing point.

In addition to these measurement data acquisition devices available at each manufacturing site, at least one additional signal about the state of the process is acquired at one or at a few manufacturing sites of the system in order to obtain more precise information about the actual process course. Process parameters that can be controlled directly as well as parameters that are meaningful for the process can be measured.

All of these recorded quantities both at the individual manufacturing locations and at the reference location or locations are reported to a higher-level evaluation unit, which, if necessary, also determines meaningful parameters derived from the recorded values. This higher-level evaluation unit also knows any existing dependencies of the measured variables or the derived parameters, so that a statement about the Process status of the reference points or the manufacturing points can be taken.

As a further evaluation step, these correlation results are examined by an evaluation that runs automatically in the higher-level evaluation unit with regard to one or more typical properties of the product (for example dyeability, uniformity of the thread during the winding travel, etc.) and from this specifications for further influencing of the individual or derived from the few reference points. In addition, statements about the quality of the product can be made at the manufacturing sites. A statement on the quality of the product at each manufacturing site can be made on the basis of a quality parameter. The quality variable can be determined by comparing the process parameter (s) with predetermined target values or by comparing the process parameters of the reference point (s).

The central point in controlling the quality of the threads produced in a multi-digit textile machine is the uniformity of the properties of the threads produced across all manufacturing locations. For this purpose, from the precise knowledge of the process sequence at the reference point or reference points, actuating variables are determined which specify the individual desired process parameters in all manufacturing points of the multi-digit machine in an identical manner. The type of manipulated variable determination depends on the process at hand. The reference points are considered to be representative of the process flow in the entire system and conclusions are drawn for the control of the other manufacturing points.

When evaluating the measurement parameters of the reference point signals and the signals from the individual production points, tolerance bands are defined which surround the respective mean values of the measurement parameters and whose width stands for permissible deviations from a target value. This eliminates, in particular, high-frequency components of the measured variable signals, which would otherwise impair the meaningfulness of the measured signals for the evaluation.

Since with such a control of the system there is only a slight influence on the control of an individual manufacturing point, a reaction of the higher-level evaluation unit must be carried out when one of the measurement parameters or one of the values derived therefrom leaves the permissible value range. If more than short-term behavior of this type occurs in one of the manufacturing points or the reference point, this manufacturing point must be switched off or identified as faulty. If a system with only one reference point is affected by the deviation of a measurement parameter, the entire system must be switched off or checked.

The central task of the higher-level evaluation unit is to control the process-dependent parameters of the manufacturing sites in such a way that the desired product-specific properties can be achieved in the sum effect. In a multi-digit textile machine, the focus is on the uniformity of the manufacturing result across all manufacturing sites. Due to the typical further processing of a large number of finished bobbins in corresponding finished products, the properties of the individual bobbins may differ only minimally with regard to further processing steps. In addition to achieving a production result that is as uniform as possible, the quality of each individual thread produced or the quality of the thread is of course also important control and ensure the finished coil for each manufacturing site.

• Erfassung der Fadenspannung vor dem Aufspulvorgang
• Erfassung der Spulenkontur der gewickelten Spule
• Erfassung des sogenannten K-Wertes, des Verhältnisses von Changierfrequenz zur Drehzahl der Spule, mittels geeigneter Meßverfahren (hierbei vor allem auch indirekte Messung dieses Frequenzverhältnisses über Signale aufgrund typischen Fadenverhaltens)
• Bestimmung des Elastizitätsmoduls der hergestellten Fäden.

In order to achieve this goal, measurements of the properties of the product and the process flow are carried out in the reference points as diverse as possible. Both individual parameters or measured variables and combinations of at least two parameters or measured variables can be used to monitor the process flow. Typically, but not limited to the following list of such measurands, the following process parameters are measured depending on the respective process and used for checking:

• Detection of the thread tension before the winding process
• Detection of the coil contour of the wound coil
• Acquisition of the so-called K-value, the ratio of the traversing frequency to the speed of the bobbin, by means of suitable measuring methods (especially indirect measurement of this frequency ratio via signals based on typical thread behavior)
• Determination of the elastic modulus of the threads produced.

In addition to the measurement of individual parameters during the thread run within a production point, several sensors of the same type or combinations of different sensors of the same type can also be arranged simultaneously at different points in the thread path within a production point. Such combinations can also be used to detect and record changes in the thread within the thread path. From this, further descriptive parameters of the process can be determined if necessary.

Within a manufacturing process, knowledge of the temporal course of individual signals can also be used to draw conclusions about a typically occurring misconduct of the thread or individual process parameters in the manufacturing site. If individual typical signal profiles or combinations of typical signal profiles are now examined for such behavior, suitable comparison methods can be used to identify these undesired behavior and, if necessary, relate it to specific system parts. The detection of typical frequencies within the signal curve allows, for example, a conclusion to be drawn about a correlating frequency of moving machine parts.

If a large number of signals are recorded in the reference points or the reference point, from which conclusions can be drawn for the process control of the overall system, conversely, in the other manufacturing points, a large number of actuating devices must be controlled by the central evaluation unit and loaded with identical manipulated variables. As a result of this direct influence on the individual production points on the basis of signals from the reference points, the most exact possible process control in the individual points can be achieved taking into account the uniformity mentioned.

In addition to the direct control of the manufacturing process, conclusions for the quality of the manufactured coils of each individual manufacturing site can also be drawn from the recorded and correlated or evaluated measuring signals. For this purpose, the production qualities of the individual coils are recorded by automatic evaluation and documentation and are automatically assigned to them as a characteristic during or after the end of the production process.

Further advantages, features and possible uses of the present invention result from the following description of exemplary embodiments in conjunction with the drawing.

Fig. 1

einen typischen Aufbau eines Systems zur Qualitätssteuerung bei der Herstellung von Fäden

Fig. 2

einen typischen Herstellungsprozeß von Chemiefaser-Fäden

Fig. 3

eine typische Temperaturführung mittels beheizter Galetten bei der Herstellung von Chemiefaser-Fäden entsprechend Figur 2

Fig. 4

einen schematischen Aufbau dreier Herstellungsstellen.

In the drawing shows

Fig. 1

a typical structure of a system for quality control in the manufacture of threads

Fig. 2

a typical manufacturing process of synthetic fiber threads

Fig. 3

a typical temperature control by means of heated godets in the manufacture of man-made fiber threads according to FIG. 2

Fig. 4

a schematic structure of three manufacturing sites.

Figure 1 shows a possible embodiment for the quality control of a multi-digit textile machine according to the concept of the invention.

• Eine Referenzstelle 4 zur genauen Erfassung des Prozeßverlaufs. Statt nur einer Referenzstelle können auch eine geringe Zahl weiterer Referenzstellen eingesetzt werden.
• Weitere Herstellungsstellen unbestimmter Anzahl, die hier beispielhaft durch die Herstellungsstellen 5 bzw. 5' dargestellt sind.

The multi-digit textile machine consists of a number of similar manufacturing locations, which are shown in FIG. 1 as follows:

• A reference point 4 for accurate detection of the process. Instead of just one reference point, a small number of other reference points can also be used.
• Further manufacturing sites of indefinite number, which are shown here by way of example by manufacturing sites 5 and 5 '.

Common to all manufacturing sites is the monitoring of the process with a sensor 10 or 10 'or 10' '(often the thread tension measurement) and possibly a few further sensors 11 or 11' or 11 ''. The data of these sensors are e.g. transferred as thread tension signal 15 or signals of further measured variables 16 to a higher-level evaluation unit 1. In addition, at the reference point 4, further measured variables such as the coil contour detection 7, the K value detection 8, the elastic modulus detection 9, and further process sensors 11 (frequency analysis, etc.) can be installed. The signals from these measuring devices also go to the higher-level evaluation unit as different measuring signals 14.

The superordinate evaluation unit 1 is now responsible for the determination of values derived from the measured values and for the correlation of all signals from the measured value sensors recorded at the same time.

For the evaluation processes that run automatically in this evaluation unit, the evaluation unit must have specifications about the desired product characteristics 2 and specifications about the process dependencies 3 that actually occur. On the basis of these specifications and a corresponding, automatically running conclusion logic, the superordinate evaluation unit 1 can make statements about the process state in the reference point 4 and in the manufacturing points 5, 5 ',. Based on the known process flows, these statements lead to specifications regarding the process control of both the reference point 4 and the production points 5 and 5 '.

This control information is sent to the various manufacturing sites in different ways. All reference points are, because they are to be influenced as much as possible, via subordinate control loops 17 regulated locally. The higher-level evaluation unit therefore provides these local control loops (preferably a separate control loop for each controllable variable) with setpoints for influencing the process. The local control loops ensure corresponding changes in the process control. These are in turn measured by sensors 7 to 11 and reported back to the higher-level evaluation unit 1 as measurement signals. The process is therefore tracked in a quality control loop with regard to the quality of the manufactured product.

All other manufacturing points 5, 5 ', ... receive control values for influencing the various process parameters instead of the target values used in the reference points. These are the manipulated variables 12 and 13 in the manufacturing site 5 and 5 '. Here, too, the process in the manufacturing site is influenced on the basis of the specified manipulated variables; these are detected by sensors 10 'or 10' 'and possibly 11' or 11 '' and are again triggered by signals 15 and possibly 16 the higher-level evaluation unit reported back. With regard to these manufacturing locations, there is therefore quality control, which is based on the optimized process management in the reference locations and the quality control implemented there.

The quality control is thus set up and kept in operation on the basis of the signal connection 18 for the feedback of the measured variables and the output of manipulated variables or setpoints via the parameter specification 19.

The desired product parameters 2 and the process dependencies 3 occurring in a given process are of central importance for a product-related control of quality the present process of the higher-level evaluation unit 1, and ideally contain all the parameters required to achieve an optimal manufacturing result. These specifications can be specified or changed both by the manufacturer of the quality control and by the user of the quality control system. This allows the process control to be largely adapted to changed manufacturing processes.

Figure 2 shows the typical structure for producing a coil from a synthetic fiber. The thread 23 is drawn off from an extrusion and spinning unit 20 by means of a godet arrangement 21 and wound up on an empty spool with the aid of a traversing device 27. In the godet arrangement 21, the thread is given appropriate physical properties such as tensile strength, extensibility, titer and others by appropriate measures. The thread can also be passed through texturing devices, not shown here, in order to achieve desired surface properties.

Following this actual production and finishing of the thread, the winding on a spool shown in the lower area of FIG. 1 follows. For this purpose, the continuously drawn thread 23 is guided via a top thread guide 25 to a traversing device 27, which initially moves the thread back and forth on the rotating empty bobbin 28 and then on the rotating bobbin pack 29. The drive motor 30 required to rotate the package is controlled by an actuator 31 so that the peripheral speed on the surface of the package always remains constant. The frequency of the oscillation is specified via a drive motor which is controlled by the actuating device 32. The coordination between the speed of the winding spindle motor 30 and the frequency of the traversing is achieved by synchronization, the traversing control 32 being informed of the speed of the winding spindle by the speed measuring device 44. By selecting suitable traversing laws, desired properties of depositing the thread on the bobbin are achieved.

Between the godet arrangement 21 and the traversing device 27 or the top thread guide 25, a thread tension measuring device 24 is connected, which enables a continuous detection of the thread tension. The thread tension signal is freed of disturbing high-frequency vibrations via a filter 33 and passed on to the evaluation device 35 as a record 34 of the tension force.

The central evaluation device 35 is responsible for controlling all actuators in the process in such a way that an optimal process flow is achieved. The main actuators in this process are: 31 Actuator for coil drive 32 Actuator for traversing drive 36,37,38 Actuators of the godet arrangement 39 Actuator for godet heating 40 Actuator for dosing pump 41 Extrusion speed actuator 42 Actuator for heating the extruder 43 Influencing the cooling air flow

The careful coordination of all these manipulated variables is a prerequisite for the production of a perfect thread and the setting of the desired properties of the thread.

Figure 3 shows schematically three manufacturing locations 4, 5 and 5 '. A thread 23 or 23 'or 23' 'is produced at each of the production points. This is a partial section of the overall process from FIG. 2, the godet arrangement and the thread tension measurement being shown in detail. However, it can also be a manufacturing site in any other machine for manufacturing a chemical thread, for example a false twist crimping machine. Production in the context of this application is understood not only to mean spinning, but also the processing of the thread.

At each of the production points, the thread is drawn out of the actual production zone by a godet 45 or 45 'and 45' '. After passing through the godet, each thread passes through a thread tension sensor 24 or 24 'or 24 ", which consists of a deflecting thread guide and the actual sensor.

The godets 22 or 22 'or 22' 'are heated. The filament tension, which is measured by the respective sensor 24, 24 'and 24' ', is influenced by this heating. At the manufacturing site 4, the measured thread tension is regulated at the same time. The manufacturing location 4 therefore serves as a reference location. The measurement parameter, namely the thread tension, is specified to a controller 47. The controller 47 generates an actuating signal 39 for the heating control as a function of a setpoint S. This regulation with adjustment of the temperature of the godet 22 keeps the thread tension at the sensor 24 constant.

The control signal 39 is now given as control signal 39 'or 39''via the line 48 identically to the heating controls of the other manufacturing sites 5 or 5'. Hence the temperatures of the godets 22 'and 22''of these other manufacturing points are set identically to the reference point.

The control signal 39 is further passed on to the local evaluation unit 46 and compared there with the target value S. This comparison can also be made against a tolerance band on both sides of the setpoint S. A quality signal Q1 is obtained from this for the quality of the control. At the other manufacturing points, the thread tension is also measured by corresponding thread tension sensors 24 'or 24' 'and the measured value is given to a local evaluation unit 46' or 46 '' assigned to the manufacturing point and compared there with the thread tension signal determined in the reference point 4. Quality signals Q2 and Q3 are determined from this.

It would now be expected that the measured value would also remain constant at these points. However, malfunctions can also occur at the manufacturing sites 5 and 5 ', which must lead to an abort of the manufacturing process in the respective manufacturing site from a definable threshold value.

Instead of outputting the quality signals Q2 or Q3 in the local evaluation units 46 'or 46' ', a return of the measured thread tension signals to a central evaluation unit according to FIG. 1 is also conceivable.

Fig. 4 shows schematically three manufacturing sites 5, 5 'u. 5 ''. A thread 23, 23 'u. 23 '' made. This is a chemical thread made of polyester, for example. The lower part of a spinning station is shown as the manufacturing site. It can however, act at a manufacturing site in any other machine for manufacturing a chemical thread, for example a crimping machine. In the context of this application, production means not only spinning but also processing of the thread. At each of the production points, the thread is drawn out of the actual production zone by a godet 22, 22 ', 22''. Each thread then passes through a thread tension sensor with the deflecting thread guides 49 and the actual sensor 24. Then the thread arrives at a head thread guide 50. The coil 28 is formed on the winding spindle 51. The winding spindle 51 is driven in such a way that the forming coil has a constant peripheral speed. For this purpose, a measuring roller 52 is used, which is in circumferential contact with the coil.

The godets 22, 22 ', 22' 'are heated. A heating device 53.1, 53.2, 53.3 is used for this purpose. The thread tension, which is measured by the respective sensor 24, is influenced by this heating. At the manufacturing site 5, the measured thread tension is regulated at the same time. The manufacturing point 5 therefore serves as a reference point. The measurement parameter, namely the thread tension, is specified to a controller 54. The controller 54 generates an actuating signal 55 for the heating control 53.1 as a function of a setpoint S. This regulation with adjustment of the temperature of the godet 22 keeps the thread tension at the sensor 24 constant.

The control signal is now also given identically to the heating controls 22 'and 22''of the other manufacturing sites 5 and 5''. Therefore the temperatures of the godets 22 'and 22''of these other manufacturing sites are set identical to the reference site.

The control signal 55 is further compared on the computer 56.1 of the manufacturing site 5 with the target value S or a tolerance band on both sides of the target value. A quality signal is obtained from this for the quality of the control. At the other manufacturing locations, the thread tension is now also measured by corresponding thread tension sensors 24, 24 ″, and the measured value is given via line 57.2, 57.3 to a computer 56.2, 56.3 assigned to the manufacturing location. It would now be expected that the measured value would also remain constant at these points. However, malfunctions can also occur at the manufacturing sites 5 'or 5'', as is shown for the manufacturing site 5''from the indicated writing of the computer 56.3. The measurement signal of the individual manufacturing points 5 'and 5''is again compared in the computer with a target value. For this purpose, the mean value can be formed from the measurement signal. It is then monitored whether the measured value leaves a tolerance band applied on both sides of the mean value. But also also whether the mean value leaves a given tolerance band. As an alternative or in addition, the control signal 55 can serve as a reference signal or a tolerance band applied around the control signal on both sides. This alternative is shown in the drawing.

Reference list

1

higher-level evaluation unit

2nd

Specification of the desired product parameters

3rd

Specification of the process dependencies that occur

4th

Reference point in a multi-digit textile machine

5

Manufacturing site 1 of a multi-digit textile machine

5 '

Manufacturing site 2 of a multi-digit textile machine

7

Coil contour detection

8th

K value acquisition

9

E-module detection

10.10 ', 10 "

Thread tension detection

11.11 ', 11 "

further process sensors

12th

Control variables for manufacturing site 1

13

Control variables for manufacturing site 2

14

Signals of all measured quantities at the reference point

15

Thread tension signals at the manufacturing sites

16

further detected signals at the manufacturing sites

17th

subordinate control loops at the reference point

18th

Signal transmission to the higher-level evaluation unit 1

19th

Command value output or setpoint specification from the higher-level evaluation unit to the manufacturing site

20th

Extrusion and spinning unit

21

Godet arrangement

22.22 ', 22 "

heated godets

23

thread

24th

Thread tension sensor

25th

Head thread guide

26

Traverse triangle

27

Traversing device

28

Empty coil or coil

29

Bobbin pack

30th

Drive motor of the coil device

31

Actuator for drive motor of the winding device

32

Adjustment device for traversing

33

Filtering the thread tension signal

34

Wrote the thread pull

35

Control of the winding device or the manufacturing site

36,37,38

Actuators for godet arrangement

39.39 ', 39 "

Control signals for godet heating of godets 22, 22 'or 22 "

40

Actuator for dosing pump during extrusion

41

Actuator for adjusting the extrusion

42

Actuator for heating the extrusion line

43

Cooling air flow

44

Tachometer

45.45 ', 45 "

Deduction godets

46.46 ', 46 "

local evaluation units

47

Heating controller for godets

48

Line for control value transmission

49

Deflection thread guide

50

Head thread guide

51

Winding spindle

52

Measuring roller

53.1

Heating device

53.2

Heating device

53.3

Heating device

54

Regulator

55

Control signal

56.1

computer

56.2

computer

56.3

computer

57.1

management

57.2

management

Claims (16)

1. Procedure for quality control in the production of a plurality of yarns in a corresponding number of production points of the same type, using the following steps:

   - continuous, simultaneous measurement of at least one process parameter (10, 10', 10") at each production point of the installation,

   - comparison of a process parameter (10, 10', 10") or of a characteristic quantity, derived from a process parameter (10, 10', 10"), of at least one production point (4), selected as a reference point, with the corresponding predefined setpoint value or reference characteristic quantity,

   - determination of a correcting quantity on the basis of the comparison,

   - control of all production points using the determined correcting quantity.
2. Procedure according to Claim 1, characterized in that at least one additional process parameter (7, 8, 9, 11) is measured on at least one production point, and preferably few production points, as reference points, and all measured process parameters (7 - 11) and/or characteristic quantities derived from them are correlated at this reference point (4), or these few reference points, in knowledge of any interdependences which might exist.
3. Procedure according to Claim 1 or 2, characterized in that the correcting quantities (12, 13, ...) of the individual process parameters are the input quantities for a control circuit (17) at the reference point or points (4).
4. Procedure according to Claim 1, 2, or 3, characterized in that the correcting quantities (12, 13, ...) are identical for all production points (5, 5', ...).
5. Procedure according to Claim 1 or 2, characterized in that tolerance bands around the respective mean values of the measurement parameters are predefined as allowable value ranges of the process parameters in the reference point or points (4) and the production points (5, 5', ...).
6. Procedure according to Claim 5, characterized in that, in the event of departure from the allowable value range of one of the process parameters in the reference point or points (4) and/or in one or more of the production points (5, 5', ...), the respective production point is switched off or identified as faulty.
7. Procedure according to Claim 1, characterized in that the product-specific characteristics to be achieved by the production process are primarily predefined, in each individual production point, with regard to the required uniformity of the production output in all production points (4, 5, 5', ...) and the quality of the produced yarn or produced bobbin.
8. Procedure according to Claim 2, characterized in that different process parameters / characteristic quantities, or combinations of at least two process parameters / characteristic quantities, which describe or define the respective process control, are used for monitoring the progression of the process.
9. Procedure according to Claim 1, 2 or 8, characterized in that the measurement of the yarn tension (10, 10', 10") is used as a process parameter at all production points (5, 5', ...) of the installation.
10. Procedure according to Claim 8, characterized in that the measurement of the bobbin contour (7) is used as a process parameter at the reference point (4).
11. Procedure according to Claim 8, characterized in that the measurement of the K-value, i.e., the ratio of the traversing frequency to the rotational speed of the bobbin, by means of appropriate measurement methods (8) is used as a process parameter at the reference point (4).
12. Procedure according to Claim 8, characterized in that the determination of the modulus of elasticity (9) is used as a process parameter at the reference point (4).
13. Procedure according to one of Claims 8 to 12, characterized in that a plurality of sensors of the same type or the same combinations of different sensors are disposed simultaneously at different points of the thread run within a production point (4, 5, 5 ...).
14. Procedure according to one of Claims 8 to 12, characterized in that the measurement of typical events from typical signal progressions (11) or combinations of typical signal progressions of the possible measurement signals by means of appropriate comparison methods is used as a process parameter at the reference point (4).
15. Procedure according to Claim 1 or 2, characterized in that different, or all, adjustment devices in the respective production process can be controlled by central predefinition of identical correcting quantities (12, 13, ...) at all production points (5, 5', ...).
16. Procedure according to Claim 1, 5 or 6, characterized in that documents for the documentation of the production quality are automatically assigned to each bobbin during the production process.

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