TWI622544B - Method for controlling the thread delivery of at least one thread delivery device and textile machine having a system with at least one thread delivery device - Google Patents

Abstract

A method for controlling the transmission of at least one line transmission device (1) to a textile machine, comprising obtaining a line (40) from a storage element (3) of the line transmission device (1) by the textile machine. The thread tension of the wire (40) is adjusted by a brake device having at least one brake element (8) in a wire path behind the storage element (3), and having an adjustment device. In this case, at least one adjustment element of the adjustment device acts on the brake element or the brake elements (8), wherein the adjustment element or the adjustment elements are controlled by a brake signal. The brake signal is adjusted by a thread tension unit to adjust the thread tension based on a reference value (Mref). The measurement value (Mi) of the thread tension is identified by a force measurement unit, and a measurement value ( Any differences (Mdiff) from the reference value (Mref) are minimized.

To judge the zero point (M0) of the tension measurement unit, borrow a judgment unit online (40) Perform a brake load removal (BE) with at least one load removal cycle when stationary, wherein during each load removal cycle, the brake signal changes from a starting value (Ia) to the brake element (8) One load (Imin) is completely released and the initial value (Ia) is returned. During the last load removal cycle, an offset value (m0) of one of the measurement devices of the tension measurement unit measured under the brake signal value (Imin) is used to judge the zero point.

Description

Method for controlling line transmission of at least one line transmission device and textile machine with system having at least one line transmission device

The object of the present invention is a method and a textile machine for controlling the line transmission of at least one line transmission device as described in the preamble of the independent item of the patent application scope. The invention relates in particular to a line transmission device having a storage element, that is, a line transmission by a storage transmission device, in which case the line is obtained from the storage element by a textile machine.

In this case, the thread tension is adjusted by a brake device and a thread tension unit based on a thread tension reference value. When adjusting the thread tension, a thread tension measurement unit is used to determine the thread tension measurement value, and in each case, any difference between the measurement value and the reference value is minimized. During the operation of the online tension measurement unit, also known as a wire tension sensor, there is a zero displacement due to, for example, temperature rise. Therefore, it is necessary to judge the zero point of the thread tension sensor.

Known from Chinese Patent Case No. CH 704303 B1, when the line is raised, Zero judgment of the sensor.

For the sensor used in the wire tension adjustment type wire transmission device, the sensor implements a balance, that is, a zero point judgment, when the wire is stationary.

For example, in European Patent No. EP 0 943 713 B1, multiple elevations of a line are drawn by a sensor. Patent case No. ITMI00 2007 22 69 A discloses that a wire transmission wheel of a wire transmission device for determining a zero point rotates forward.

The German patent case DE 195 00 517 A1 clearly states that the sensor is measured and calibrated during online standstill and operation.

Wire tension sensors are also used for winding and rewinding. Known from European Patent No. EP 0 406 735 B1, it is recorded during any interruption in the winding process and used as a sensor measurement for the new zero point.

The problem with judging zero when the line is stationary is to ensure that the sensor is no longer loaded by the line.

For example, in the aforementioned European Patent No. EP 0 943 713 B1, this problem is solved by multiple lifting lines. This requires a separate, additional lifting unit.

Since the wire tension sensor in the present invention is used to adjust the wire tension of the wire taken from the storage wire transmission device, the forward rotation of the wire transmission device known from the aforementioned ITMI00 2007 22 69 A case cannot be used.

The problem to be solved by the present invention is to determine the zero point of a thread tension measurement unit used for the development of a wire tension adjustment type wire transmission of a storage wire transmission device.

This problem can be solved by the characteristic features of independent items in the scope of patent application.

By the method for controlling a wire transmission according to the present invention, wherein the wire is obtained by a textile machine from a storage element of the wire transmission device, wherein the thread tension can be adjusted. The wire tension is adjusted by a brake device having at least one brake element in a line path behind the storage element and having an adjustment device. For this reason, at least one adjusting element of the adjusting device is controlled by a braking signal to make it act on the braking element or the braking elements.

During the line tension adjustment, the line tension is adjusted to a reference value by a line tension unit. For this reason, the measured value of the thread tension is identified by a force measuring unit, and in each case any difference between a measured value and the reference value is minimized.

In order to use one of the judgment units of the wire tension unit, the zero point of the tension measurement unit is judged when the wire is stationary, and the braking load is removed in at least one load removal cycle.

During each load removal cycle, the brake signal changes from a starting value to a minimum value. For example, at the minimum value, the brake element or the brake elements completely releases the load and returns to the starting value. During the last load removal cycle, the value determined by a measurement device of the tension measurement unit according to the brake signal value will be used to determine the zero point of the tension measurement unit.

To apply a load to a braking element, at least one adjusting element is actuated by a starting value of the braking signal. The reason is that in order to remove the load, the adjusting element is braked by a different braking signal, for example, a minimum braking signal, so that the adjusting element does not affect the braking element. With one or more of this type of load removal cycle, any blockage of the wire and / or the brake element can be removed. In a specific embodiment, at least two load removal cycles are performed. Three load removal cycles are preferably performed.

In a specific embodiment, the brake device has a cone (cone) one of the brake elements. The braking element is disposed at a lower end of the storage body. When the load is removed, there is a risk that the brake element will become blocked due to a slight axial tilt. Applying and removing the load of the brake element will center the brake element and unblock it. This will allow the zero point of the tension measurement unit to be reliably determined.

In a specific embodiment of the present invention, a value in the middle range of the full range of the brake signal value is selected as the starting value of the brake signal.

In a specific embodiment, a load removal cycle is performed in 0.1 to 2 seconds.

In a specific embodiment, a time interval of 20 to 200 milliseconds is provided between the two load removal cycles.

In a specific embodiment, the zero points of the tension measurement units of the plurality of wire transmission devices are determined in parallel. In another option, when the line transmission devices and a central control unit form a system, the zero point judgment in the line transmission devices is initiated by the central control unit.

In a specific embodiment, a preliminary operation is performed before the brake load is removed. During a preliminary operation, the textile machine is put into operation for a predetermined operation time, and a thread tension operation value is specified. In another option, the thread tension actuation value is specified by the central control device.

In a specific embodiment, after the preliminary operation, a delay of 0.1 to 2 seconds is provided before the first load removal cycle. During the delay, the line can settle.

In a specific embodiment, the adjusting elements are arranged as magnetic elements, wherein a certain magnetic element can move in the magnetic field of another magnetic element and act on the braking element or other braking elements. In this case, the thread tension is adjusted, where the cloth One of the two magnetic elements provided as a working coil is controlled by a working current. In other words, the brake signal is an operating current that activates the working coil.

The features and advantages of the patent scope of the device item correspond to those of the patent scope of the method item.

A textile machine according to the foreword of the eighth aspect of the patent application includes at least one line transmission device, the line tension unit of which displays a judgment unit, and the judgment unit is used to judge the zero point of the tension measurement unit when the line is stationary. The judgment unit is designed to implement a brake load removal with at least one load removal cycle, wherein during each load removal cycle, the brake signal is changed from the initial value to the brake element or the like The brake element is completely unloaded and returns to this starting value. During the last load removal cycle, a value of a measuring device of the tension measuring unit measured under the braking signal value is used to judge the zero point.

In a specific embodiment, the textile machine includes a system having the line transmission devices and a central control unit. The central control unit is attached to transmit a desired thread tension value to a wire transmission device of the system.

In a specific embodiment, the central control unit is designed to initiate the removal of the brake load of the line transmission devices in each case.

In a specific embodiment, it is arranged to start the parallel zero point judgment of the tension measurement units of the plurality of wire transmission devices. The central control device transmits a signal to the line transmission devices in parallel or in series to determine the zero point.

In a specific embodiment, the central control system is arranged to specify a thread tension actuation value during a preliminary operation, wherein the preliminary operation is performed before the brake load is removed, and the textile machine is put into operation during the preliminary operation. Actuation for a given actuation time.

1‧‧‧line transmission device

2‧‧‧ bracket

3‧‧‧Storage element

4‧‧‧ Fastening device

5‧‧‧ axis

6‧‧‧Driver Case

7‧‧‧ Winding element

8‧‧‧Brake element of brake device

9‧‧‧chassis

10‧‧‧ clamping surface

12‧‧‧Working coil

Adjustment element of adjustment device

E‧‧‧Electronic Room

40‧‧‧line

P‧‧‧Processing unit

Thread tension unit

Current transmission unit (brake signal):

SL‧‧‧Current Unit

Zhang force measurement unit:

50‧‧‧Thread tension sensor

51‧‧‧Measurement device

52‧‧‧ Wiring

53‧‧‧Measurement unit

54‧‧‧ Deviation memory m0

55‧‧‧Storage M / m

60‧‧‧Tension control unit

61‧‧‧Reference unit

62‧‧‧ Adder

70‧‧‧judgment unit

S1‧‧‧Brake load removal signal

S2‧‧‧zero judgment signal

BE‧‧‧Brake load removed

Lb‧‧‧line length

FS‧‧‧Central control device

K‧‧‧ communication wiring

M‧‧‧textile machine

The invention is further illustrated by means of an example outlined in the drawings. In the drawing, Fig. 1 shows a schematic diagram of a side view by a line transmission device; Fig. 2 shows a block diagram of a textile machine having a system having at least one line transmission device for controlling the line Line transmission of the transmission device; FIG. 3 shows a simplified flow chart of the brake load removal of a line transmission device; and FIG. 4 shows a simplified flow chart of the zero point judgment of the tension measurement unit in the plurality of line transmission devices, in which the load is removed A preliminary stroke is implemented before; and FIG. 5 shows a graph of the braking signal and the curve of thread tension during the zero point judgment of the tension measurement unit in the thread transmission device according to the present invention at the time when the textile machine is turned on.

A textile machine according to the present invention has a system having at least one line transmission device 1 for controlling the transmission of a line 40 to the textile machine. The line transmission device shown in Fig. 1 is arranged as a storage line transmission device. The wire transmission device 1 has a bracket 2, a winding unit, a storage element 3, and a brake device, wherein the wire 40 is removed from the storage element 3 by the textile machine, and the brake device is used to adjust a thread tension. The textile machine is, for example, a circular knitting machine.

The bracket 2 is provided with a fastening device 4 for fastening the wire transmission device. Set 1 to fasten to the textile machine, for example to a machine ring of a circular knitting machine.

The storage element 3 is arranged as a storage drum having an axis 5. At the winding end of the storage element 3 and the right end in FIG. 1, a winding unit for winding a single yarn winding, that is, a winding of a thread, is disposed on the storage element 3. The winding unit is provided with a driver and a winding element 7, wherein the driver is arranged in a driver housing 6, and the winding unit can be driven by the driver.

The bracket 2 extends along the storage element 3 parallel to the axis 5. The driver housing 6 is fastened to the holder 2 at the winding end of the storage element 3 and the right end of the drawing.

The brake device for adjusting the thread tension of the wire 40 includes a brake element 8 and a brake element 8 adjustment device. The braking element 8 is arranged behind the storage element 3 on a line path, wherein the braking element is arranged at the moving end of the storage element 3 drawn in dotted lines. One of the casings 9 of the braking device is fastened to the bracket 2 at the end of the storage element opposite the driver casing 6.

The brake element 8 is tapered, that is, it is arranged as an elastic brake cone with a regular truncated cone, and is made of, for example, a plastic and / or metal. Equivalent or similar brake elements are described, for example, in International Patent Application No. WO2006 / 045410A1.

The axis of the braking element 8 substantially overlaps the axis 5 of the storage element 3, ie, except for slight deviations caused by, for example, lifting of the borrow line 40 or deformation of the elastic braking element 8. The extraction end of the storage element 3 is circular and forms an annular clamping surface 10 in the circular area. The brake element 8 projects beyond the clamping surface 10 with its larger diameter. By means of the adjusting device, the braking element can be pushed against the clamping surface 10 at the take-out end of the storage element 3.

When the thread 40 is obtained by the textile machine, the thread 40 runs from the storage element 3 through the clamping surface 10 through the gap between the take-out end of the storage element 3 and the brake unit 8.

The adjusting device has a plurality of adjusting elements, that is, magnetic elements, one of which One magnetic element can move in the magnetic field of the other magnetic element, and acts on the braking element 8. One of these magnetic elements is configured as a working coil 12. In this example, the adjusting device includes a permanent element hereinafter referred to as a PM element, and a working coil 12 movable in a magnetic field of the PM element. The PM element and the working coil 12 are located in the casing 9 and cannot be seen in the first figure. The working coil 12 acts on the brake element 8. The working coil 12 operates on the principle of an immersion coil called a sounding coil.

The magnetic element of the adjusting device can be controlled by a braking signal, that is, by the working current of the working coil 12. When the braking element 8 is contacted, exposing the working coil 12 to a given working current will cause the working coil 12 to make as small an axial movement as possible, and thus change the contact of the braking element 8 against the clamping surface 10 pressure. By changing the contact pressure, a desired thread tension can be adjusted.

To completely remove the load from the brake element 8, the working current will be changed, and the working coil 12 is moved back so that the brake element is no longer exposed to a position under a contact pressure.

The bracket 2 forms an electronic chamber E together with the casing 9. For example, an electronic component of the adjusting device such as a current transmission device is disposed therein to control the working coil 12. In FIG. 1, it can be seen that the electron chamber E is located in a region above the casing 9.

This type of braking device is described in German patent cases DE 10 2013 113 115.8 and DE 10 2013 113 122.0.

In addition, the wire transmission device 1 includes a wire tension unit for adjusting the wire tension with a force measuring unit. The tension measuring unit has a wire tension sensor 50, a measuring device 51, and a wiring 52. FIG. 1 shows the thread tension sensor 50 in a schematic diagram, and the measuring device 51 is indicated by an arrow. The thread tension sensor is disposed behind the casing 9, that is, in a line path on the left side of FIG. 1. Measuring device 51 for thread tension sensor 50 Connected to the line transmission device 1 via a wiring 52. The thread tension sensor 50 is fastened to the casing 9.

FIG. 2 shows a block diagram of the textile machine. The system of the textile machine has at least one line transmission device for controlling the line transmission of the line transmission device 1.

In the following, a thread tension expected value Fdes and a thread tension reference value Mref will be distinguished. The expected tension value is, for example, a value in centinewtons, and the reference value is a reference value Mref of the measured value Mi of the thread tension unit.

The adjustment device of the line transmission device 1 includes a current transmission device, which uses a current unit SL having a pulse width modulation for the working current of the working coil 12, that is, the braking signal of the adjustment element.

The wire transmission device has a processor unit P, which includes the current transmission device and the wire tension unit.

In order to control the thread tension, the thread tension unit includes the tension measurement unit. The tension measurement unit has a thread tension sensor 50, a measurement device 51, and a connection 52, and also has a measurement unit 53, and a deviation storage. A measuring device 54 and a memory 55, wherein the measuring device transmits a measured tension value mi, for example in millivolts, the measuring unit is used for identifying the measured value Mi from the value mi, and the deviation storage is used for storing the deviation value m0, this storage is used to store the conversion ratio M / m.

According to the following formula, a measurement value Mi is determined from the value mi of the measurement device 51: Mi = (mi-m0) xM / m

The wiring 52 connects the measuring device 51 to the processor P. This connection is connected to the measurement unit 53 and the deviation memory 54. The deviation memory 54 and the memory 55 are attached to the measurement unit 53.

The thread tension unit has a tension control unit 60 for The force expected value Fdes identifies a reference value unit 61 and a adder 62 of the reference value Mref.

To determine the zero point of the tension measurement unit, the thread tension unit includes a determination unit 70 for determining the value I_DES of the working current.

The thread tension unit is connected to the current transmission unit and more specifically to the current unit SL via the judgment unit 70. The value I_DES is the value of the operating current transmitted from the thread tension unit to the current transmission unit, which is hereinafter referred to as the output value I_DES.

The reference value unit 61 is designed to transfer the reference value Mrf to the thread tension measurement value Mi. The reference value unit is connected to one of the reference value inputs of the tension control unit 60 to transmit the reference value Mref. The output of the measurement device 51 is connected to the measurement unit 53 via a connection 52 to transmit a value mi. The measurement unit 53 is connected to one of the measurement inputs of the tension control unit 60 to transmit the measurement value Mi.

The tension control unit 60 is arranged to calculate a difference value Mdiff from the measured value Mi and the reference value Mref, and judge one of the positive or negative current difference value Idiff of the working current from the difference value Mdiff, where the difference value Mdiff is a minimizer. An adjustment value output of the tension control unit 60 is connected to an input of the adder 62 to transmit the adjustment value, that is, a change in the current difference Idiff. The judging unit 70 is connected to a second input of the adder 62 to transmit the value I_DES of the operating current. One output of the adder 62 is connected to the determination unit 70 to transmit the value Ides of the operating current. The value Ides = I_DES + Idiff is the operating current determined by the tension control unit 60, that is, the brake signal adjustment value.

The judging unit 70 is arranged to specify a braking signal, that is, a current value I_DES of the operating current. To determine the zero point of the tension measurement unit, the determination unit 70 is arranged to implement a brake load removal BE with at least one load removal cycle when the line is stationary. With each load cycle, the working current, that is, its expected value I_DES, starts with one The starting value Ia changes to a value Imin when the load is completely removed from the brake element 8.

The judging unit 70 is connected to the deviation storage 54 via a line to transmit a control signal. With the control signal S2, the value mi of the tension measurement unit 51 measured during the last load removal cycle under the operating current value Imin is determined as a new deviation value m0 and is therefore used to judge the zero point.

In addition to the line transmission device 1, the system includes a plurality of line transmission devices 1 ', 1 ", ... a central control device FS, and a communication connection K, the central control device FS and the line transmission devices 1, 1', 1" , ... are connected to each other via the communication wiring. The central control device FS is attached to the textile machine M, that is, its machine controller.

The central control device FS is connected to this thread tension unit, specifically to the reference unit 61, to supply the thread tension expectation value Fdes via the communication connection K.

The central control device FS is connected to the determination unit 70 to transmit a control signal via the communication connection K. The removal of the brake load BE is initiated by the control signal S1.

The central control device FS is arranged to perform a preliminary operation before judging the zero point of the tension measurement unit, and specify a line tension actuation value Fb.

The communication wiring K is arranged such as CAN-BUS, and the line transmission device 1 and the central control device FS are connected to the communication wiring.

In this example, the processor unit P of the line transmission device 1 is arranged in the line transmission device 1, specifically the adjustment device.

The indicated components are arranged as electronic components and / or programs (software).

During operation, the thread 40 is transmitted from the thread transfer device 1 to the textile machine in each case, wherein the thread 40 is obtained from the storage element 3 by the textile machine M. The thread tension of the wire 40 is adjusted by a brake device in the wire path following the storage element 3, wherein the brake element 8 is pushed against the clamping surface 10 at the take-out end of the storage element 3. In this situation, The working coil 12 and the adjusting element of the adjusting device act on the brake element 8. The working coil 12 is controlled by the working current and the brake signal of the current transmission unit.

In order to adjust the thread tension based on the reference value Mrf, the brake signal is adjusted by the thread tension unit. For this reason, the tension measurement unit is used to determine the thread tension measurement value Mi, and the difference Mdiff between the reference value Mrf and the measurement value Mi is minimized.

The value mi of the measurement device 51 of the line tension sensor 50 is as indicated above. In the measurement unit 53, the current deviation value m0 of the deviation memory 54 and the conversion ratio M / of the measured value Mi by the memory 55 m.

The difference Mdiff is determined in the tension control unit 60, and the current difference Idiff is obtained from this. The tension control unit 60 includes, for example, a proportional-integral (PI) controller. This positive or negative current difference Idiff is added in the adder 62 to the operating current output value I_DES. The result and the new expected value Ides are supplied to the determination unit 70. The judging unit 70 transmits the new expected value Ides as an output value I_DES to the current supply unit.

The thread tension is adjusted using a time constant t2, which is 0.1 to 5 seconds, particularly 0.3 to 2 seconds. In this example, the time constant t2 is 0.3 seconds.

Figure 3 shows a simplified flow chart of the brake load removal BE with Nmax load removal cycles at 40 stationary. After the start, the number N is adjusted to start from zero. Since the preliminary operation may have been performed in advance, a delay of TA of 0.1 to 2 seconds was observed.

Finally, the number N is increased by one. N = 1 performs the first load removal cycle.

The determination unit 70 changes its output value I_DES from the output value Ia to the value Imin in steps ΔI. At the value Imin, a check is performed to see if the last load removal cycle has been reached, ie N = Nmax. If not, the output value I_DES is gradually changed to Ia again.

A time interval Tp of 20 ms to 200 ms was observed. After the time interval Tp, a check is again performed to see if the last load removal cycle has been reached. If it is not reached, the next load removal cycle N = N + 1 is performed.

If the last load removal cycle is reached at the value Imin, the deviation value m0 is replaced by the current value mi. To this end, the judgment unit transmits a signal S2 for judging the zero point to the deviation memory 54. The output value I_DES is gradually changed to Ia again.

Once the output value I_DES has been changed to the output value Ia and an update has been asked about Nmax, the brake load removal BE ends.

Fig. 4 shows a simplified flowchart for determining the zero points of the plurality of line transmission devices 1, 1 ', 1 ", ..., wherein a preliminary operation is performed before the brake load is removed from the BE.

In the first stage of the judgment, the textile machine is stopped. To this end, the central control device FS sends a corresponding signal to the textile machine M. The central control device FS stores the current thread tension Fi of the line transmission devices 1, 1 ', 1 ", .... The central control device specifies the storage line thread operation values of the line transmission devices 1, 1', 1", ... Fb. Based on the reference value Mref corresponding to the value Fb, the line tension is adjusted in the online transmission devices 1, 1 ', 1 ", ....

In the second phase, the central control unit FS starts the textile machine for a given operating duration. In this example, the operating duration corresponds to a specific transmission line length Lb of at least one line transmission device 1, 1 ', 1 ", .... The central control device FS then stops the textile machine M.

In the fourth stage, the central control device FS removes the brake load of the line transmission devices 1, 1 ', 1 ", ... via the brake load removal signal S1 provided to the respective determination unit 70. As shown in FIG. 3 As described above, the brake load removal BE is performed in the online transmission devices 1, 1 ', 1 ", .... The central control unit FS interrogates the transmission devices 1, 1 ', 1 ", ... to find out whether the brake load removal BE and the zero point judgment have ended.

If this is true for all the wire transmission devices 1, 1 ', 1 ", ..., the desired wire tension value Fdes is reset by the central control device FS to the wire transmission devices 1, 1', Expected values of thread tension 1 ", ... Fi.

FIG. 5 shows the brake signal during the zero point judgment of the tension measurement unit of the online transmission device 1 during the turning-on time of the textile machine M, that is, the output value I_DES of the judgment unit 70 for the working current, and the curve of the amount of thread tension.

This illustration shows that the textile machine M is started (started) after a short period of time, and stopped (stopped) after a predetermined operating time. The operating duration corresponds to a specific supply line length Lb.

At the time when the textile machine M is started, an operating current output value Ib is transmitted from the judging unit 70 to the working coil 12, and the output value corresponds to the thread tension operating value Fb of the central control device FS. The thread tension is adjusted. During this period, the output value Ib fluctuates slightly.

After the spinning machine M has stopped, the thread tension decreases. The output value Ib remains at a value of Ib until the brake load removal BE starts. The thread tension decreases to a value above its zero point.

After the brake load is removed and the BE is started, the output value will change to the starting value Ia during the delay TA.

The starting value Ia is an average value of the full range between the operating current, that is, the maximum value Imax and the minimum value Imin of the brake signal. In this example, the full range of the operating current is 200 milliamps to -200 milliamps, where the initial value Ia is 0 milliamps and the lowest value Imin is -200 milliamps.

Then there are N load removal cycles, where N is 3. During a load removal cycle, the determination unit 70 changes the output value from the initial value Ia to the value Imin in steps ΔI and returns to the initial value Ia. Between the secondary load removal cycles, one moment was observed Distance Tp.

During the load removal cycle, especially during the first load removal cycle, the thread tension drops below its zero point. In the case of the output value Imin of the last, that is, the third load removal cycle, the new zero point of the tension measurement unit will be judged. In other words, the deviation value m0 of the measurement device 51 changes, as described above.

In another option, the central control unit FS is only connected to the textile machine M to transmit a stop signal. The textile machine M control executed by the central control system FS in the above example is manually implemented by the user.

Claims (11)

A method for controlling at least one line transmission device (1,1 ', 1 ", ...) line transmission to a textile machine (M), wherein a line (40) is transmitted from the line by the textile machine (M) A storage element (3) of the device (1) is obtained, wherein the thread tension of the wire (40) is adjusted by a braking device having at least one braking element in a line path behind the storage element (3) (8) and having an adjustment device, wherein at least one adjustment element of the adjustment device acts on the brake element (8) or the brake elements, wherein the adjustment element or the adjustment elements are controlled by a brake signal, and The brake signal is adjusted by a thread tension unit to adjust the thread tension based on a reference value (Mref). The measurement value (Mi) of the thread tension is identified by a force measurement unit, and a quantity Any difference (Mdiff) between the measured value (Mi) and the reference value (Mref) is minimized. It is characterized in that to determine the zero point of the tension measurement unit, a judgment unit (70) is placed on the line (40). ) Perform a brake load removal (BE) with at least one load removal cycle when stationary, where During each load removal cycle, the brake signal changes from a starting value (Ia) to the braking element (8) or a value (Imin) at which the braking element completely releases the load, and returns to the starting value (Ia) ; And during the last load removal cycle, an offset value (m0) of a measurement device (51) of one of the tension measurement units determined under the brake signal value (Imin) is used to determine The zero point. For example, the method of claim 1 in the patent scope, wherein an average value of the entire range of the brake signal is selected as the starting value (Ia) of the brake signal. For example, if the method of the first or second item of the patent application is applied, a load removal cycle is performed within 0.1 to 2 seconds. For example, the method of applying the scope of item 1 or 2 of the patent application, wherein a time interval of 20 to 200 milliseconds (Tp) is provided between the load removal cycles. For example, the method of the first or the second item of the patent application scope, wherein the zero point of the tension measurement unit of the plurality of wire transmission devices (1, 1 ', 1 ", ...) is judged in parallel, and in this case, The brake load removal (BE) is initiated by a central control unit (FS). For example, if the method of claim 1 or item 2 of the patent scope is applied, a pre-operation is performed before the brake load is removed. During the pre-operation, the textile machine is put into operation for a predetermined operation time, and if this is the case, A central control device (FS) is used to designate a thread tension actuation value (Fb). For example, the method in the sixth aspect of the patent application, wherein after a preparatory operation, a 0.1 to 2 second delay (TA) is provided before a brake load is removed (BE). A textile machine with a system having at least one line transmission device (1), the at least one line transmission device is used to transmit one line (40) to the textile machine (M), wherein each line transmission device (1) is a storage element (3) ), A line (40) can be obtained from the storage element by the textile machine, a brake device has at least one brake element (8) in the line path following the storage element (3), and has a function for adjusting the An adjusting device for the thread tension of the wire (40), wherein the adjusting device includes at least one adjusting element acting on the braking element (8) or the braking elements, and the adjusting element or the adjusting elements can be borrowed by one The brake signal is actuated and has a thread tension unit. The thread tension unit adjusts the thread tension by adjusting the brake signal according to a reference value (Mref). The thread tension unit includes a measurement value for identifying the thread tension. (Mi) is a tension measurement unit, and is arranged to minimize a difference (Mdiff) between a measurement value (Mi) and the reference value (Mref) in each case, which is characterized by Each line transmission device (1) has one of the line tension units Element (70), which is used to determine the zero point of the tension measurement unit when the line is stationary, and is arranged to perform a brake load removal (BE) with at least one load removal cycle, wherein during each load removal cycle , The brake signal changes from a starting value (Ia) to the braking element (8) or a value (Imin) at which the braking element completely releases the load, and returns to the starting value (Ia); and the last load shift During the division cycle, a value (m0) of a measuring device (51) of the tension measuring unit measured at the braking signal value (Imin) is used to judge the zero point. For example, for a textile machine with a scope of patent application No. 8, wherein the system has a central control unit (FS), the central control unit is attached to transmit the desired thread tension value (Fdes) to the system's wire transmission device ( 1,1 ', 1 ", ...), and the central control unit is arranged to initiate the brake load removal (BE) of one of the line transmission devices (1,1', 1", ...). . For example, the textile machine with the scope of patent application No. 9 in which the central control unit (FS) is arranged to start parallel tension measurement units of a plurality of wire transmission devices (1, 1 ', 1 ", ...). Zero judgment. For example, for a textile machine with the scope of patent application No. 10, the central control unit (FS) is arranged to specify a thread tension actuation value (Fb) during a preliminary operation, wherein the preliminary operation is performed after the brake load is removed (BE ), And the textile machine (M) is put into operation for a given operation time during the preliminary operation.