EP1156143A1 - Method for oparating a creel and creel for a winding machine - Google Patents

Abstract

At least one out of a group of threads of the same running length (L1 or L2) is monitored continuously for thread tension, between leaving the creel frame and winding on the winding machine. Measured- and desired values are compared. When a departure is detected, thread brakes of the relevant group are adjusted, causing the actual value to approach the desired value. An Independent claim is included for the corresponding creel frame for a winding plant. Preferred features: Thread brakes (18) of each thread group having the same running length, are controlled by a common- or an individual drive motor (20). For each thread group having the same running length, actual thread tensions are measured on two or more threads, to determine a mean for comparison with the desired value. A further variant of the method based on the foregoing principles is described. Thread brakes of a vertical row of spooling locations are adjusted by a common drive motor. Further variants of the plant, based on the foregoing principles, are also claimed.

Description

The invention relates to a method for operating a creel for a winding system according to the top handle of claim 1. With such a method, one is as optimal as possible Tension equalization of all threads on a creel sought because the different lengths of the threads between the winding units and winding machine and the associated thread guide without corresponding compensation to different thread tensions would lead. The consequence of this would be an uneven one Winding density.

EP-A 319 477 describes a device for voltage compensation the threads on a creel became known which the thread brakes of the vertical rows of winding units can be loaded to different extents are. The control rod is activated by drive motors, which receive control signals from a processor. Measured becomes the actual value of the thread tension of an entire thread assembly using a measuring roller shortly before winding. A consideration of the thread tension of individual threads or individual groups of threads are not possible.

DE-A 195 46 473 discloses a method for controlling Winding devices for thread coulters. There is also one here Tension measurement of the thread assembly shortly before winding up to by means not shown on the tension of the threads to act on the creel. With the help of a across the thread bandage mobile test car is the consecutive one Tension measurement of individual threads in a predetermined Time interval possible. A mean voltage value is formed from this, which is accordingly the common tensioning of all threads. With this procedure an individual regulation of Single threads or individual groups of threads practically not realized because not every thread is scanned at the same time can be.

Other disadvantages of this method are that it is intermittent Measurement at the winding speeds driven today is sluggish and also the thread measured by the measuring device is mechanically loaded, which is an individual change in thread tension causes.

DE-A 44 18 729 also relates to a device for regulating the thread tension in a creel. This facility has one for each bobbin holder directly at the winding point Brake rotor on. Serves as a sensor for the thread tension a tensioning lever which is acted upon by the unwound thread becomes. A fluid pressure working grips each coil holder Loading device on the clamping lever, the fluid pressure is jointly adjustable for all loading devices. The individual control of the thread tension can thus be achieved through a general setting options of all thread tensioners can be overlaid. A disadvantage of this device, however, is that the control loop is limited to the winding unit. This is not suitable for an overhead creel.

The braking directly on the coil holder is also not Suitable for all work processes and the different barrel lengths the thread remains between the winding unit and the winding machine disregarded.

It would also be generally desirable to use a creel with different types of threads, e.g. various Yarn qualities, yarn thicknesses or yarn colors, the tension tension to adapt to the individual thread types. Such individual consideration of yarn types was previously not possible at all.

It is therefore an object of the invention, a method of the beginning to create the type mentioned, with simple means a optimal and versatile control of the entire winding process allowed. Thereby, with low energy consumption modern electronic means can be used. The gate control to as many different operating conditions as possible be customizable. This object is achieved according to the invention solved a method that the features in claim 1 and in Claim 5 has.

By continuously measuring the actual value of the thread tension all threads, on thread groups or at least on one thread Each thread group with the same length is the tension behavior the threads on the entire creel with minimal time delay detectable. The measurement takes place in the range between leaving the gate and winding on the winding machine, which ensures that the different Run lengths and deflections of the threads are taken into account. The Control process can be for individual threads or for certain groups of threads can be individually designed, making the gate versatile can be used. The mechanical function and arrangement the thread brakes only play a subordinate role. Through this process, thread influences become different Thread thicknesses, thread structure, other material influences and Influenced influences at the take-off point in the creel.

The method according to the invention can be used particularly advantageously each individual thread brake with a drive motor assigned to it activate. This is with today's inexpensive, miniaturized drives easily possible. Consequently For the first time, each individual thread on the creel can be individually regulated become.

It is also possible to use a thread group with the same material properties for each thread an identical target thread tension value and the measured actual thread tension within the thread group to the specified thread tension TARGET value by adjusting the thread tension regulation

However, it is also possible with the method according to the invention the thread brakes with each thread group with the same barrel length to activate a drive motor. As a rule, the threads form of vertical rows (rails) of winding units per gate side one thread group each with the same length. It is therefore possible in a known manner, all thread brakes on one vertical row (rail) with a common gear link activate, with the drive motor in the area of the top or the lowest winding unit is arranged. So it is also possible A group-wise regulation for a desired thread group with one drive motor each.

In certain cases, it is sufficient to include from each thread group same running length on at least two threads the actual value of the thread tension is measured, and if from the at least two actual values an ACTUAL mean value is formed that corresponds to the TARGET value is compared. This measuring principle is based on the assumption that the threads of a certain thread group are about the same behavior. Despite the selective measurement, however, there is an exposure the thread brakes both by means of individual drive motors on each thread brake, as well as by means of a common one Drive motor possible.

Further procedural advantages can be achieved if the threads in the thread running direction at least before each thread brake a pretensioner device with an additional braking force be applied, which is set as the basic value or which is set depending on the measured actual value becomes.

Depending on the material properties, such as quality, rotation, The strength and tendency of the threads to curl, etc., must be different Pretensioners are used to ensure trouble-free To ensure that the threads run off. The pretensioners on a loop basis, such as eyelet pretensioners, Crepe pretensioners, etc. can be used individually or in rails with a Drive motor can be adjusted to ensure optimal thread flow to obtain.

It is also possible to use the different barrel lengths Threads or the thread groups (gate length compensation) exclusively to compensate with the help of the pretensioner devices. On in this way the subsequent thread brakes are mandatory required compensation and they can relate to Unleash their full braking efficiency.

In addition, the above-mentioned pretensioning devices can also be used for increasing the thread tension before entering the thread brakes be, the thread tension together with the thread brake is also regulated individually or in groups. These pretensioners can also be used as the only means be used for voltage distribution. There would be none additional thread brakes required, which is very inexpensive is. The term "thread brake" as used here thus includes in the broadest sense also all prestressing devices.

In certain cases it is advantageous if on the winding machine the tensile force of the whole combined into a thread band the threads in the area in front of the winding point as the actual tape tension measured and compared with a Tension value and if all thread brakes are found when a deviation is found can be adjusted simultaneously in such a way that the actual strip tension value approximates the target tension. This additional regulation of the tape tension is superimposed on the regulation of the thread tension described above, with all voltage changes between the thread tension sensors and the winding point become.

The invention also relates to a creel for a winding system, that in terms of device through the features in Claim 8 or 13 is characterized. With such a creel the thread tension can be adjusted individually on each individual thread or only on at least one thread of each thread group measured with the same barrel length using thread tension sensors become.

However, the use of at least two thread tension sensors is also conceivable for measuring at least two threads from each Group of threads of the same length to get an average to build.

The measurement is advantageously carried out on threads that are not of deducted adjacent winding units of the corresponding rail become.

There are basically different principles of thread tension sensors known. As particularly advantageous for the inventive However, sensors have proven to be useful for this purpose Force measuring device with a measuring element that responds to elongation have, the force occurring transversely to the thread is measurable on the deflected thread. Such a thread tension sensor is described for example in DE-A 197 16 134, the content of which is hereby accepted in its entirety. The The sensor has a compact exterior and is relatively small insensitive to pollution. The piezoresistive one Measuring bridge requires very little energy, which may be the case with the large number of sensors play a significant role plays. The measurement is also directly linear with the Movement of the sensor, with the possibility of measurement errors is reduced.

The thread tension sensor can also be functionally special simple way as thread monitor for thread running or thread break control insert the thread. Falls below or exceeds the thread tension of one or more threads the lower or upper control range, a warning signal is issued or the The winding system can be stopped automatically.

The functions of the thread tension sensor described can in addition to the use for thread tension control only as Monitoring function in a winding system for the entire thread group be used.

Be particularly advantageous as a drive motor for the thread brakes (Normal pressure thread brake e.g. disc brake, wrap thread brake, dynamic thread brake, etc.) or the mentioned Pretensioners (eyelet pretensioners, crepe pretensioners) Stepper motors used, which have a self-locking Act on the gearbox on the brake fluid. The advantage of this Stepper motors is that they only operate during activation, but do not absorb energy in the holding phase. In order to energy consumption can be reduced significantly. On self-locking drive motor, for example with a worm gear or a self-locking spindle drive ensures that a position approached by the stepper motor is held becomes. The advantage of the stepper motor is that at any time the position of the thread brakes or the position of the pretensioners are known and can be calibrated.

Each winding unit can have at least one signal component, in particular a thread monitor for thread run or thread break control of the thread and / or an optical signaling means for identification assigned to the winding units or as a slip-on aid his. The thread monitoring can be done according to various known Functional principles take place, e.g. the mechanical Falling pin principle, Hall sensors, optical monitoring means etc. A signaling means to facilitate the assembly of a Coil gate has become known, for example, from EP-A-329 614.

All electrically activatable means assigned to a winding unit, especially the drive motors for the thread brakes, however also, the signal components mentioned can be via common signal lines to be activated. For this purpose they survive serial interfaces with a central control device in Active connection. Obviously, this eliminates the need for a complex one Wiring the individual components.

Fig. 1

eine stark schematisierte Seitenansicht auf ein Spulengatter mit den Merkmalen der Erfindung,

Fig. 2

eine Draufsicht auf das Spulengatter gemäss Fig. 1,

Fig. 3

eine Draufsicht auf eine einzelne Spulstelle mit Vorspannereinrichtungen und mit einer Tellerbremse,

Fig. 4

eine perspektivische Darstellung eines Stützprofils mit darin angeordneten Tellerbremsen, in Gesamtansicht und im Detail,

Fig. 5

eine schematische Seitenansicht einer Spulstelle mit einem Oesenvorspanner, einem Crepevorspanner und mit einer Tellerbremse,

Fig. 6

eine schematische Seitenansicht einer Spulstelle mit einem Oesenvorspanner und mit einer Umschlingungsfadenbremse,

Fig. 7

eine Prinzipdarstellung eines Spulengatters mit fadenweiser Spannungsmessung, einzeln angetriebenen Tellerbremsen und einzeln angetriebenen Oesenvorspannern und Crepevorspannern,

Fig. 8

eine Prinzipdarstellung eines Spulengatters mit fadenweiser Spannungsmessung, einzeln angetriebenen Tellerbremsen und schienenweise angetriebenen Oesenvorspannern und Crepevorspannern,

Fig. 9

eine Prinzipdarstellung eines Spulengatters mit schienenweiser Spannungsmessung, schienenweise angetriebenen Tellerbremsen und schienenweise angetriebenen Oesenvorspannern und Crepevorspannern, und einem Fadenwächter zwischen Spule und Fadenbremse,

Fig. 10

eine Prinzipdarstellung eines Spulengatters mit fadenweiser Spannungsmessung, einzeln angetriebenen Umschlingungsfadenbremsen und einzeln angetriebenen Oesenvorspannern.

Fig. 11

eine Prinzipdarstellung eines Spulengatters mit fadenweiser Spannungsmessung, einzeln angetriebenen Umschlingungsfadenbremsen und schienenweise angetriebenen Oesenvorspannern,

Fig. 12

eine Prinzipdarstellung eines Spulengatters mit schienenweiser Spannungsmessung, schienenweise angetriebenen Umschlingungsfadenbremsen und schienenweise angetriebenen Oesenvorspannern, und einem Fadenwächter zwischen Spule und Fadenbremse, und

Fig. 13

eine perspektivische Darstellung von Gruppen von Fadenspannungssensoren auf verschiedenen Ebenen.

Further advantages and individual features of the invention result from the following description of exemplary embodiments and from the drawings. Show it:

Fig. 1

3 shows a highly schematic side view of a creel with the features of the invention,

Fig. 2

2 shows a plan view of the creel according to FIG. 1,

Fig. 3

a plan view of a single winding unit with pretensioning devices and with a disk brake,

Fig. 4

1 shows a perspective view of a support profile with disc brakes arranged therein, in overall view and in detail,

Fig. 5

1 shows a schematic side view of a winding unit with an eyelet pretensioner, a crepe pretensioner and with a disk brake,

Fig. 6

2 shows a schematic side view of a winding unit with an eyelet pretensioner and with a wrap thread brake,

Fig. 7

a schematic representation of a creel with thread-wise tension measurement, individually driven plate brakes and individually driven eyelet pretensioners and crepe pretensioners,

Fig. 8

a schematic representation of a creel with thread-wise tension measurement, individually driven disc brakes and rail-wise eyelet pretensioners and crepe pretensioners,

Fig. 9

a schematic diagram of a bobbin creel with rail-wise tension measurement, rail-wise driven disc brakes and rail-wise driven eye pretensioners and crepe pretensioners, and a thread monitor between the bobbin and thread brake,

Fig. 10

a schematic representation of a creel with thread tension measurement, individually driven wrap brakes and individually driven eyelet pretensioners.

Fig. 11

a schematic representation of a creel with thread-wise tension measurement, individually driven wrap brakes and rail-wise eyelet pretensioners,

Fig. 12

a schematic diagram of a creel with rail-wise tension measurement, winder brakes driven by rail and winder pretensioners driven by rail, and a thread monitor between the bobbin and thread brake, and

Fig. 13

a perspective view of groups of thread tension sensors at different levels.

According to FIGS. 1 and 2, there is a winding system 1, for example a warping system, from a creel 2 and one Winding machine (cone warping, slip, tree, etc.) 3. The individual thread bobbins 4 are at bobbins 7 of the creel put on and pass the threads 5 pulled together at least one thread brake 6 to maintain one predetermined thread tension.

The example shows a parallel gate with a left gate side LS and with a right gate side RS. Form the coils vertical and horizontal rows, obviously one vertical row on each side of the gate, one group of threads forms the thread length of the winding from the winding unit to the winding machine is the same size. The same principle can also for any other type of gate, e.g. B. used in a V-gate become.

On the creel, regardless of the length of the thread, different Set coils of different types, for example different yarn qualities or different Thread colors are attached. Regardless of the so-called gate length compensation, can be threads of different genres each be subjected to an individual braking force.

Fig. 2 shows the two thread groups with the longest run length L1 and the two thread groups with the shortest barrel length L2.

In the area of the gate side 8, which the winding machine 3 on is preferably the thread tension sensors 9 either for each individual thread or for at least one thread arranged from the thread group with the same length (per rail). The arrangement of the thread tension sensors on this However, the position is not mandatory. In principle, it would be advantageous the thread tension sensors as close as possible to the winding point the winding machine.

The thread tension sensors can therefore also be in one area the winding point of the winding machine i.e. between reading and The warping blade can be arranged to bring the threads together. At corresponding miniaturization of the thread tension sensors can these are thus arranged so close together that in spite of the fact that each thread has already been brought together Thread can be applied. This also makes it unnecessary the previous band tension regulation because all changes the braking force was measured until just before the formation of the winding can be.

This could also be the thread path between the creel and the winding machine are included in the control loop. This is alternatively also possible in that the known per se Belt tension regulation with a common tension measurement of the entire thread assembly just before winding up is, so that the individual control process according to the invention is still overlaid by a global control process. A such tension control is, for example, by CH-A-675 598 became known, the disclosure of which is hereby in its entirety is taken over.

After leaving the creel, the threads get into the Area of the winding machine 3, where it first has a reading sheet 10 happen in which the threads get their correct order. The threads are then fed to the warping blade 11, in which they are brought together to form a thread 12 via a deflection and / or measuring roller 13 onto the roll 15 or to be wound onto the winding tree 14.

Depending on the intended use of the creel, you can use one winding unit 7 different braking means can be arranged.

3 shows, for example, how one unwound from a coil 4 Thread 5 two pretensioners on a loop basis and runs through a thread brake. An eyelet pretensioner 16 and a crepe pretensioner (named after the one with a strong twist Crepe yarn) 17 have the task of to wind the thread-formed claw and as a chicane to act against swirl backflow and thus to avoid the formation of claws. At the same time, they limit the thread balloon, which forms when unwinding from the coil 4.

The wrapping of the pretensioners 16 and 17 can can be adjusted by rail or individually, e.g. by a Rotating or swiveling movement. The main braking force is by a disc brake 18 with two in a row in the thread running direction arranged brake actuator units. upset. The disc brake is housed in a U-shaped, vertical support profile 19, in its U-leg thread guide eyelets for the passage of the thread 5 are arranged.

It can also be advantageous if the crepe pretensioner is individual per thread are adjustable to prevent claw formation at different Avoid types of yarn and thus good drainage behavior to reach the thread.

Fig. 4 shows further details of such a disc brake. About each disc brake 18 is directly in the support profile 19 individual drive motor 20 attached. This operates via an adjustment support 22 a pressure element 23, which the brake actuator burdened or relieved.

Figures 5 and 6 show a schematic representation of winding units with various pretensioners and braking devices. According to FIG. 5, the thread 5 initially runs according to FIG. 3 an eyelet pretensioner 16 and then a crepe pretensioner 17 before it is guided through the disk brake 18.

6 shows an alternative embodiment of a winding unit with a wrap brake 39. As a pretensioner only one eyelet pretensioner 16 is used. With the wrap thread brake can the twist angle and thus the Degree of wrap can be set. This will make the Friction and thus the thread tension set or regulated. The pre-tensioning and braking devices according to the 5 and 6 can be both rail-wise and individually can be adjusted by thread.

7 shows one, related on the winding machine 3, distant coil row 24 and one close Spool row 25 with three levels each, i.e. with three spool positions each. In reality, each vertical row (rail) can have up to 12 Have floors. The thread tension is for all vertical Rows (rails) measured on a common measuring plane 38.

As shown, each thread has its own thread tension sensor.

These thread tension sensors can be used to regulate the thread tension, for monitoring the specified thread tension range and used as thread break monitoring.

The thread runs through between the bobbin and the disc brake Eye pretensioner 16 and then a crepe pretensioner 17. These pretensioner devices are each made via an individual Drive motor 20 driven. After the pretensioner device the threads reach a disc brake 18, which also individually provided with a drive motor 20 is. On the disc brakes of a rail, one can also common drive motor 40 can be activated so that the lower Brake plate to rotate in a manner known per se to make cuts to avoid the threads in the brake actuators. It is also very advantageous if the drive motor 40 for the plate drive is so controllable that it is on vertical rows (Rails) of winding units without threads based on the existence control automatically by the thread tension sensors or the thread monitors can be deactivated. Through the thread tension sensors or the thread monitors always know which winding positions are not equipped.

In addition, each winding unit is still an optical signal element 26 and an acknowledgment switch assigned as a coil attachment aid serves, and thus facilitates the loading of the creel. The signal element serves the different coil character or coil types according to the prescribed repeat attach correctly. In addition, the individual Thread tension TARGET values automatically the corresponding Thread types can be assigned.

Each vertical row (rail) is with an electronic node 29, 29 'provided, which via a serial line system Can process 28 different signals. Each gate side has its own main processor 30, 30 ', the Activities coordinated via a transmission processor 31 become. This also allows one gate side to be controlled individually. The thread tension TARGET values can be per thread, per thread group or can be entered in rails on a display. The entered TARGET values are provided by the transmission processor the main processors 30 and 30 'forwarded and there with the ACTUAL values compared. The actual values for the thread tension will be from the thread tension sensors on a common measuring level 38 measured and to the measurement collection units 32 and from there forwarded to the main processors 30 and 30 ', respectively. These main processors thus take on the function of a comparison device for comparing the actual values with the entered TARGET values.

8 differs from 7 in that the eyelet pretensioner 16 and the crepe pretensioner 17 in rails with a common one Drive motor 21 are adjustable. The. Disc brakes 18 have however, also via individual drive motors 20.

In the embodiment according to FIG. 9, on the other hand, there is another one Measuring principle for use. As shown, not everyone has Thread via its own thread tension sensor. Per thread group L1 and L2, each with the same barrel length, are only two thread tension sensors 9 and 9 'are provided. But it would also be conceivable more than two thread tension sensors per thread group or to arrange even a single thread tension sensor. With two or more thread tension sensors each form an average, representative of all threads in the same group and which is fed to the main processors 30, 30 '.

On each vertical row of bobbins is direct in the direction of the thread after the thread spools 4 a thread monitor 27 for the existence control arranged. This is in the present embodiment necessary because not all thread tension sensors are used 9 take on this task. The thread guards could but also arranged between the coil and the gate output become.

As in the embodiment of FIG. 8, the Oesenvorspanner 16 and the crepe pretensioner 17 over rails common drive motors 21 adjusted. But also the drive the disc brakes 18 are not made individually, but in rails via a common drive motor 21.

10 is again each individual Provide thread with its own thread tension sensor 9. Instead of disc brakes, as in the previous exemplary embodiments, however, thread brakes 39 come to Use individually with an individual drive motor 20 are adjustable. Only serve as pretensioner Eye pretensioner 16, which also has individual drive motors 20 are adjustable.

11 differs according to 10 only in that all eyelet pretensioners 16 a vertical row (rail) with a common drive motor 21 are adjustable.

Finally, the embodiment shown in FIG. 12 shows again a measuring principle in which analog to the embodiment 9 averaged the thread tensions of a thread group become. Wrapping thread brakes 39, but not individually, but via a common drive motor 21 are adjustable. Also the adjustment of the eyelet pretensioner 16 takes place in rails. For the existence control the threads become additional thread monitors as in FIG. 9 27 used.

Obviously, according to the invention, further combinations would also be possible conceivable, e.g. through the use of alternative thread brakes or pretensioners or by omitting or adding further measuring, control or signaling devices at the individual winding units.

In Fig. 13 it is shown how one for each floor on the gate Entire thread tension sensor battery 34, consisting of the thread tension sensors 9, is arranged. The attachment takes place on a common support 33. Each sensor has a movable sensor 37, which is between two thread guides 36 is arranged that the thread 5 is deflected. The the actual measuring bridge is arranged in a closed housing 35, the individual housings directly next to each other can be attached.

Combining the thread tension sensors in units of 8 has the advantage that these units are mechanically inexpensive, Space-saving and electrically compatible with an 8-bit unit are.

Claims (26)

Method for operating a creel (2) for a winding system (1), in particular a warping system, with several winding stations (7), in which several threads (5) are drawn off from the winding stations together with a winding machine (3), at each winding station as a function of the length (L) between the winding unit and the winding machine, the thread is subjected to a braking force on at least one thread brake (6), and several threads of the same length form at least one thread group, characterized in that that the actual value of the thread tension in the area between leaving the gate and winding on the winding machine is continuously measured on at least one thread from each thread group with the same running length, that the measured actual value is compared with a target value and that when a deviation of the ACTUAL value from the TARGET value is ascertained, the thread brake of the thread concerned or the thread brakes of the relevant group of threads is or are adjusted such that the ACTUAL value approximates the TARGET value. A method according to claim 1, characterized in that the thread brakes of each thread group with the same length are activated with a common drive motor (21). A method according to claim 1, characterized in that each thread brake is activated with a drive motor (20) assigned to it. Method according to one of claims 1 to 3, characterized in that the actual value of the thread tension is measured from each thread group with the same run length on at least two threads, and that an actual mean value is formed from the at least two actual values, which with the TARGET value is compared. Method for operating a creel (2) for a winding system (1), in particular a warping system, with several winding stations (7), in which several threads (5) of different types are drawn off from the winding stations with a winding machine (3), whereby at each winding point, the thread is subjected to a braking force on at least one thread brake (6), characterized in that that the actual value of the thread tension is continuously measured on each thread in the area between leaving the gate and winding on the winding machine, that the measured actual value of each thread is compared with a corresponding target value and that when the actual value deviates from the target value, the thread brake of the thread in question is adjusted in such a way that the actual value approximates the target value each thread brake being activated by a drive motor (20) assigned to it. Method according to one of claims 1 to 5, characterized marked that the threads in the thread running direction before each Thread brake on at least one pretensioning device (16, 17) with an additional braking force, which is set depending on the measured actual value, or which is fixed as the basic value. Method according to one of claims 1 to 6, characterized in that on the winding machine the tensile force of the entirety of the threads combined to form a thread band is measured in an area in front of the winding starting point as the actual strip tension value and is compared with a desired bundle tension value, and that when a deviation is ascertained, all thread brakes are adjusted simultaneously in such a way that the actual strip tension value approaches the target strip tension value. Bobbin creel (2) for a winding unit (1), in particular a warping unit, with several winding units (7), from which several threads can be pulled off simultaneously with a winding machine (3), and with at least one thread brake (6) assigned to each winding unit, on which the thread can be subjected to a braking force as a function of the running length between the winding unit and the winding machine, the threads of the same running length forming at least one thread group, characterized in that that in the area between the winding units closest to the winding machine on one side of the gate (8) and the winding tree (14) of the winding machine (3), at least for each thread group with the same running length (L), a thread tension sensor (9) is arranged on which the ACTUAL -Value of the thread tension of a thread is continuously measurable, that the ACTUAL value in a comparison device (30, 30 ') is comparable to a TARGET value, and that when a deviation of the ACTUAL value from the TARGET value is ascertained, a drive motor can be activated with which the thread brake of the thread concerned or the thread brakes of the relevant group of threads can be adjusted such that the ACTUAL value is the TARGET -Value approximates. Bobbin creel according to claim 8, characterized in that the thread brakes of a vertical row of winding units can be activated with a common drive motor (21). Bobbin creel according to claim 9, characterized in that each thread brake can be activated with a drive motor (20) assigned to it. Bobbin creel according to one of claims 8 to 10, characterized in that for each vertical row of winding positions at least two thread tension sensors (9, 9 ') are arranged, with which the thread tension of these threads of the row concerned can be measured, and that in a computer from the measured ACTUAL values, an ACTUAL mean value is formed, which is compared with the TARGET value. Bobbin creel according to one of claims 8 to 10, characterized in that each winding unit is assigned its own thread tension sensor. Bobbin creel (2) for a winding unit (1), in particular a warping unit, with several winding units (7), from which several threads of different types can be drawn off simultaneously with a winding machine (3), and with at least one thread brake (6) assigned to each winding unit, on which the thread can be subjected to a braking force, characterized in that that in the area between the winding points closest to the winding machine on a gate side (8) and the winding tree (14) of the winding machine (3) a thread tension sensor (9) is arranged at least for each thread, on which the actual value of the thread tension of a thread is continuously measurable, that the actual value of each thread in a comparison device (30, 30 ') can be compared with a corresponding target value, and that when a deviation of the ACTUAL value from the TARGET value is ascertained, a drive motor can be activated with which the thread brake of the thread concerned can be adjusted in such a way that the ACTUAL value approximates the TARGET value, each thread brake with a drive motor assigned to it (20) can be activated. Bobbin creel according to one of claims 8 to 13, characterized in that the thread tension sensors have a force measuring device with a measuring element which is responsive to elongation, the force occurring transversely to the thread being measurable on the deflected thread. Bobbin creel according to one of claims 8 to 14, characterized in that a plurality of thread tension sensors are arranged on a row per gate level, each sensor being surrounded by a separate housing. Bobbin creel according to one of claims 8 to 15, characterized in that each winding unit is assigned at least one pretensioner device (16, 17) arranged in the thread running direction in front of the thread brake for applying an additional braking force which can be driven independently of the thread brake, or which is fixed as a basic setting is adjustable. Bobbin creel according to claim 16, characterized in that the pretensioning device is an eyelet pretensioner (16) with a rotatable eyelet and deflecting the thread and / or a crepe pretensioner (17) with adjustable wrap elements. Bobbin creel according to one of claims 8 to 17, characterized in that the thread brakes are wrap thread brakes with an adjustable wrap angle or disc brakes (18) with the thread acting and differently resilient brake actuators. Bobbin creel according to claim 16 or 17, characterized in that the pretensioners (16, 17) of a vertical row of winding units are adjustable with a common drive motor (21), and in that the thread brakes of the same row either over a common drive motor (21) or over drive motors (20) associated with each thread brake can be activated. Bobbin creel according to one of claims 8 to 19, characterized in that the drive motors for the thread brakes are stepper motors and that they act on the thread brakes via a self-locking gear. Bobbin creel according to one of Claims 8 to 20, characterized in that at least one thread monitor (27) for thread break control or thread movement control of the thread is assigned to each winding position. Bobbin creel according to one of claims 8 to 21, characterized in that each winding unit is assigned at least one optical signaling means (26) for identifying the winding unit and / or as a coil attachment aid. Bobbin creel according to one of claims 8 to 21, characterized in that all electrically activatable means associated with a winding unit, in particular the drive motors for the thread brakes, are operatively connected to a central control device via serial interfaces. Bobbin creel according to one of claims 8 to 23, characterized in that the thread tension sensors (9) are arranged in an area in front of the winding point of the winding machine (3) and between a read and a warping blade (11) for bringing the threads together. Coil creel according to claim 17, characterized in that the pretensioner device has at least one crepe pretensioner which is individually adjustable with a drive motor assigned to it. Bobbin creel according to claim 18, characterized in that the brake actuators for the thread brakes of a vertical row (rail) can be rotated with a common drive motor (40) which can be controlled via the thread tension sensors or the thread monitor so that the drive motor of the relevant vertical row without Threads can be deactivated automatically.

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