TW201930677A - Method for controlling the feed of threads of a system with several thread feeders and textile machine with a system with several thread feeders - Google Patents

Abstract

At least one thread feeder (ATC) with a tensioning unit is operated as a master thread feeder, and at least one further thread feeder (VC) as a slave thread feeder for controlling the feed of threads of a system with several thread feeders (VC, ATC) with a pre-determined thread tension, where the thread tension of at least one thread of a thread feeder (ATC) is regulated to a reference value (Mref) by a tensioning unit of the thread feeder (ATC). The thread tension of each thread of the slave thread feeder(s) is controlled by a setpoint controller with the aid of the tensioning unit(s) of the master thread feeder(s). A braking signal is adjusted with the corresponding tensioning unit for controlling the thread tension of the thread of the master thread feeder(s). The thread feeders (VC, ATC) of the system are each allocated specific data (spD), wherein the specific data (spD) comprises an allocation of values of a braking force determining the thread tension to values of the braking signal. The thread tension of the thread(s) (40) of the slave thread feeder(s) is controlled in that the setpoint controller calculates a setpoint value for the braking force for the slave thread feeder(s) from the value(s) of the braking signal of the master thread feeder(s), and presets this to the slave thread feeder(s).

Description

   Method for controlling yarn feeding of system with several yarn feeders and textile machine with system of several yarn feeders   

The object of the present invention is a method for controlling the yarn feeding of a system having several yarn feeders to a workstation of a textile machine with a predetermined yarn tension, and a textile machine having a corresponding system.

A method for operating a yarn feeder to feed yarn to a textile machine is known from DE 102 34 545 B4. The yarn feeder is operated in the tension control mode with exactly the same target tension in the test phase, where the number of yarns fed is recorded. After the test phase, the yarn feeder is adjusted or controlled by the preset yarn count calculated from the recorded yarn count.

A method for feeding several yarns to a textile machine is described in EP 2 067 886 B1, where the feeding takes place with a uniform yarn feeding length. The feeding device is configured to maintain the tension of the corresponding yarn at a predetermined value. In one example, the control and adjustment of the tension of all other feeding devices is controlled by the controller of one of these feeding devices.

A method for controlling the feeding of yarn from a yarn feeder to a textile machine is known from DE 10 2013 113 115 B4, where the yarn is pulled out from the storage body of the yarn feeder. These yarn feeders are also known as storage yarn feeders. The yarn tension of the yarn is adjusted in the yarn path downstream from the storage body by means of an adjustment device using a braking device. For this purpose, the braking signal, that is, the operating current, is adjusted for the adjusting device. Specific data is input to the data unit for the yarn feeder, where the value of the operating current is assigned to the yarn tension value used to calculate the specific data.

Yarn feeders are known from DE 10 2014 118 743 A1 and from DE 10 2015 118 027 B3. Each yarn feeder includes a yarn tension unit for adjusting the yarn tension to match the reference value of the yarn tension.

This problem is to develop a method for controlling the feeding of the yarn with a predetermined yarn tension over a longer operating period of several workstations of the textile machine and the corresponding system, where the cost of the yarn feeder is reduced.

These issues are resolved as follows.

A method for controlling the yarn feed of a system having several yarn feeders to a textile machine with a predetermined yarn tension, by which the tensioning unit of the yarn feeder The yarn tension is adjusted to a reference value. At least one of the yarn feeders with the tensioning unit is operated as an active yarn feeder, and at least the other yarn feeder is operated as a driven yarn feeder.

The yarn tension of at least one yarn is adjusted to a reference value by the active yarn feeder in this way, and the yarn tension of at least another yarn supplied by the driven yarn feeder is sent by the active feeder Controlled by the yarn carrier. The yarn tension of the yarn of the driven yarn feeder or unit is controlled by the set point controller with the aid of the tensioning unit of the active yarn feeder or the tensioning units of the active yarn feeders.

In another option, the yarn tension of the yarn of the driven yarn feeder or unit is controlled by a setpoint controller, wherein the setpoint controller is connected to the tensioning unit of at least two active yarn feeders .

The yarns are pulled out of the yarn feeder by the workstation of the textile machine, wherein each yarn feeder has a storage body and a braking device provided with an adjustment device. The yarn tension of the individual yarns of the feeder is adjusted by controlling the corresponding adjustment device with a braking signal. Each of the yarn feeders is assigned specific data, where the specific data includes the distribution of the braking force value that determines the thread tension as the value of the braking signal.

Control the yarn tension of the yarn of the individual driven feeder, where the setpoint value for the braking force of the driven feeder is braked from the active feeder or unit by the setpoint controller The signal value or values are calculated and preset for the driven yarn feeder.

A setpoint controller designed to control the yarn tension of the yarn of the driven yarn feeder is foreseeable in the tensioning unit of the active yarn feeder.

In another option, the setpoint controller is foreseeable among the separate system controllers or designed as a separate system controller. The separate system controller is connected to the tensioning unit of the active yarn feeder.

In this way, most yarn feeders without a tension controller can be operated as driven yarn feeders, together with one or more yarn feeders that are operated as active yarn feeders that design the yarn tension controller use. Yarn feeders without tension controllers are less complicated and more cost-effective to manufacture. Yarn feeders with specific information assigned to them should be used, which include values that assign yarn tension values to braking signals. Such a yarn feeder is known from DE 10 2013 113 115 B4.

In an embodiment, the yarn tension of the individual yarns of the feeder is adjusted by at least one brake body of the brake device, wherein at least one adjustment element of the adjustment device acts on the brake body or bodies , And wherein the adjustment element or elements are controlled by the braking signal.

In one embodiment, the yarn tension of the individual yarns of the feeder is adjusted by the adjustment element of the adjustment device formed as a magnet element, wherein one magnet element can move within the magnetic field of the other magnet element And acting on the brake body, the working current of one of the two magnet elements forming the braking signal is adjusted, and the element is designed as the working coil of the magnet element.

In one embodiment, the yarn feeders of the system are divided into one or more groups. In at least one group, the active / slave operation is adjusted, wherein the yarn feeders are operated as active and driven yarn feeders. For each group with active / slave operation, the set point value of the braking force for the driven yarn feeder or unit of the group is determined separately by the set point controller and is pre-determined Set to the group of driven yarn feeders or units.

In one embodiment, initialization is performed before specifying the setpoint value.

During the initialization period, the setpoint controller obtains specific data of the yarn feeder with at least the tensioning unit for each group of active / driven operations, and transmits the driven yarn feeders into preset conditions.

During the preset period, the setpoint controller will calculate the setting for the braking force from the value or values of the braking signal of the active yarn feeder or unit by means of the specific data of the driven yarn feeder or unit Point value and preset these to the driven yarn feeders. If necessary, the preset can be repeated.

In another option, the preset is repeated continuously. In one example, the repetition is performed at a frequency of about 10 Hz, that is, about 100 ms.

In one embodiment, the setpoint value for the braking force is filtered by the setpoint controller from the braking signal value of the active yarn feeder or unit, or from the braking signal of the active yarn feeder The filter value is calculated.

In one example, the filtered value is the median value of the braking signal value of the individual active yarn feeder. In another option, the filtered value is the sliding median value of the braking signal values.

If there are several active yarn feeders, the setpoint controller calculates the median value from the filtered value again, for example.

In one embodiment, an infinite impulse response filter (IIR filter) or another selected finite impulse filter (FIR filter) is used to calculate the median value.

In one embodiment, the setpoint value for the braking force is calculated by the setpoint controller from the median of the braking signal values of at least two active yarn feeders.

The features and advantages of the patent application scope of the device are the same as those of the method.

The textile machine is equipped with a system for controlling the feeding of yarn to the workstation of the textile machine with several yarn feeders, and the yarn has a predetermined yarn tension. The system comprises at least two yarn feeders, for example at least one yarn feeder with a tensioning unit and at least one yarn feeder without a yarn tensioning unit.

With the yarn feeder having the tensioning unit, the tensioning unit for adjusting the yarn tension of the yarn of the yarn feeder is adjusted to the reference value. At least one yarn feeder with a tensioning unit can be operated as an active yarn feeder and at least one additional yarn feeder as a driven yarn feeder, wherein by means of the tensioning unit of the active yarn feeder or the like The tensioning units of the active yarn feeder control the corresponding yarn tension of the yarn of the driven yarn feeder or unit through a setpoint controller.

Each yarn feeder has a storage body and a braking device downstream of the yarn path by the storage body, wherein each of the yarn feeders of the yarn feeders is withdrawn from the storage body by a workstation of the textile machine. The braking device has an adjusting device for adjusting the yarn tension, wherein the adjusting device is controlled by a braking signal.

Each yarn feeder of the system is assigned specific data, wherein the specific data includes the value of the yarn tension determining the braking force is assigned to the braking signal value.

The setpoint controller is designed to control the yarn tension of the corresponding driven yarn feeder, where the setpoint for the braking force of the driven yarn feeder is determined by the braking signal of the active yarn feeder or unit The value or values are calculated and preset for the driven yarn feeder or unit.

In one embodiment, the brake device of the yarn feeder has at least one brake body downstream from the storage body in the yarn path and an adjustment device for adjusting the yarn tension, wherein at least one adjustment of the adjustment device The element acts on the brake body or the brake bodies, and the adjustment element or elements are / are controlled by the brake signal.

In one embodiment, the adjustment device of the brake device includes two adjustment elements designed as magnet elements, one of which can move within the magnetic field of the other magnet element and can act on the brake body.

One of the two magnet elements forming the braking signal, that is, the working current of the working coils designed for the magnet elements, is adjusted to adjust the yarn tension.

In one embodiment, the yarn feeders of the system are divided into one or more groups. In at least one group, the active / driven operation can be adjusted, wherein the yarn feeders are operated as active and driven yarn feeders. For each group of driven yarn feeders or units in the active / slave operation, the setpoint controllers are designed to calculate separate braking presets for the braking force and are the slaves of the group The feeder or unit presets this.

1‧‧‧ Yarn feeder

2‧‧‧Fixture

3‧‧‧Storage body

4‧‧‧Assembly tool

5‧‧‧axle

6‧‧‧Drive housing

7‧‧‧winding element

8‧‧‧Brake body of brake device

9‧‧‧Housing

10‧‧‧Clamping surface

E‧‧‧Electronic Room

40‧‧‧Yarn

50‧‧‧Yarn tension sensor

51‧‧‧Measurement device

52‧‧‧Connector

K1‧‧‧Communication connection

K2‧‧‧Communication connection

M‧‧‧Machine controller

NMT‧‧‧Central control device

T‧‧‧Textile machine

The present invention will now be explained in more detail with reference to two examples and outlined in the diagram. Shown are: Figure 1 is a schematic side view description of a yarn feeder without a yarn tensioning unit; Figure 2 is a schematic side view illustration of a yarn feeder with a yarn tensioning unit; Figure 3 is a A simplified block diagram of a spinning machine with several yarn feeder systems as a first example; FIG. 4 is a fragment of the block diagram of FIG. 3 with arrows for explaining the default communication; FIG. 5 is a simplified flow of initialization Figure 6 is a simplified simplified flowchart of the set point value; Figure 7 is a simplified block diagram of a system with several yarn feeders as a second example, where the yarn feeders are divided into groups ; And FIG. 8 is a block diagram of the first two groups of FIG. 7 with arrows for explaining the default communication.

The textile machine T with a system includes several yarn feeders VC, ATC. The system is used to control the feeding of yarn with a predetermined yarn tension to the workstation of the textile machine. The system includes a yarn feeder VC without a tensioning unit and a yarn feeder ATC with a tensioning unit for adjusting the yarn tension of the yarn 40 of the yarn feeder ATC. At least one yarn feeder ATC can be operated as an active yarn feeder, and at least one additional yarn feeder VC is operated as a driven yarn feeder.

First example:

In the first example, the system has a group of 16 yarn feeders. A yarn feeder ATC with a tensioning unit can be operated as an active yarn feeder, and 15 yarn feeders VC without a tensioning unit can be operated as driven yarn feeders. Fig. 1 shows a schematic explanatory diagram of a yarn feeder VC without a tensioning unit, and Fig. 2 shows a corresponding explanatory diagram of a yarn feeder ATC having a tensioning unit. A simplified block diagram of a textile machine T with a system of 16 yarn feeders ATC, VC is illustrated in FIG. 3.

Figure 1 shows one of these yarn feeders VC, which is designed to store yarn feeders. The yarn feeder VC has a clamp 2, a winding unit, a storage body 3, and a braking device for adjusting the yarn tension, the yarn 40 is passed through the workstations A1, A2, A3, ... of the textile machine T A16 (see Figure 3). The braking device includes an adjusting device, wherein the adjusting device is controlled by a braking signal for adjusting the yarn tension. The textile machine T is, for example, a circular knitting machine.

The clamp 2 is equipped with an assembly tool 4 for assembling the yarn feeder VC to the mechanical ring of the textile machine T, for example to the circular knitting machine.

The storage body 3 is designed as a storage drum with an axle 5. The winding unit for winding the loop yarn, that is, winding the yarn onto the storage body 3 is arranged at the winding end, the upper end of the storage body 3 in FIG. 1. The winding unit is equipped with a driver disposed in the driver housing 6 and a winding element 7 that can be driven by the driver.

The clamp 2 extends parallel to the wheel axis 5 along the storage body 3. The driver housing 6 is attached to the winding end of the storage body 3 on the jig 2, that is, the upper end in FIG. 1.

The brake device for adjusting the yarn tension of the yarn 40 has a brake body 8 and an adjustment device for the brake body 8. The brake body 8 is arranged downstream of the storage body 3 in the yarn path, wherein the brake body is arranged at the leading end of the storage body 3 indicated by the dotted line. The housing 9 of the brake device is attached to the end of the storage body on the clamp 2 opposite the driver housing 6.

The brake body 8 is designed as a yielding brake body which is conical, ie in the form of a regular truncated cone sleeve. It is made of plastic and / or metal, for example. An identical or similar brake body is described in WO2006 / 045410 A1, for example.

Except for some deviations, such as the deviation of the yarn 40 being lifted or deformed by the elastic brake body 8, the axle of the brake body 8 is substantially identical to the axle 5 of the storage body 3. The leading end of the storage body 3 is made circular, and an annular clamping surface 10 is formed in the circular area. The brake body 8 protrudes further than the clamping surface 10 with its larger diameter. It can be pressed against the clamping surface 10 at the leading end of the storage body 3 by the adjusting device.

When the textile machine T pulls out the yarn 40, the yarn 40 passes the clamping surface 10 from the storage body 3 through the gap between the leading end of the storage body 3 and the brake body 8.

The adjustment device has an adjustment element, that is, a magnet element, one of which can move within the magnetic field of the other magnet element and acts on the brake body 8. One of the magnet elements is designed as a working coil. In this example, the adjustment device includes a permanent element in the following PM element, and a movable working coil in the magnetic field of the PM element. The PM element and the working coil are located in the housing 9 and are not visible in FIG. 1. The working coil acts on the brake body 8. The working coil works according to the principle of a plunger coil, which is also known as "voice coil" in English.

The magnet element of the adjustment device can be controlled with a braking signal, that is, with the operating current for the working coil. When in contact with the brake body 8, the application of a specific working current to the working coil will cause the smallest possible axial movement of the working coil, and therefore the braking body 8 against the clamping surface 10 Changes in contact pressure. The change in contact pressure sets a desired yarn tension.

In order to completely remove the load from the brake body 8, the working current is changed in such a way that the working coil is moved back to a position where the contact force is no longer applied to the brake body 8.

Starting from the housing 9, the jig 2 forms an electronic chamber E, in which electronic components of the adjustment device, such as a power supply unit, are configured to control the working coil. In FIG. 1, the area of the electronic chamber E can be seen above the housing 9.

This braking device is described in DE 10 2013 113 115 A1 and in DE 10 2013 113 122 A1.

Figure 2 shows a yarn feeder ATC provided with a tensioning unit, which is equivalent to a yarn feeder VC without a tensioning unit, except for the features described below.

The yarn feeder ATC additionally includes a tensioning unit for adjusting the yarn tension with a tension measurement unit, which has a yarn tension sensor 50, a measuring device 51, and a connector 52. FIG. 2 schematically illustrates a yarn tension sensor 50 provided with a measuring device 51 indicated by an arrow, which is arranged in the yarn path behind the housing 9, that is, at the lower end in FIG. 2. The measuring device 51 of the yarn tension sensor 50 is connected to the yarn feeder 1 via the connector 52. The yarn tension sensor 50 is attached to the housing 9.

Each of the feeders VC and ATC illustrated in FIGS. 1 and 2 is assigned specific data spD. The specific data spD includes the value of the yarn tension determining braking force assigned to the value of the braking signal, that is, the value I of the operating current.

Each of these yarn feeders VC, ATC has a processor unit, and a data unit for sending specific data spD of the individual yarn feeders VC, ATC is provided. The data unit is designed to provide the specific data spD. The specific data spD includes the braking signal value, that is, the value of the operating current I determines the measured value F of the braking force for the yarn tension. This means that the data unit includes the value I of the operating current for the individual yarn feeders VC, ATC, which is assigned to the individual value F of the braking force.

The measured value F of the braking force is assigned to the value I of the working current to determine the specific data spD.

By means of the braking force current trajectories used to determine the specific data spD, the value F of the generated braking force is measured, for example, depending on the value I of the working current in the working coil.

For example, in one example, a straight line is generated, where, for example, the value I of the measured working current is increased to the value of the braking force, which is used to calculate the specific data spD of the feeder VC, ATC. The specific data spD, in this example, the parameters P1, P2 of the straight line, which assigns the braking force value F to the working current value I: (1) F = P1 + P2xI.

The calculation and use of specific data are described in DE 10 2013 113 115 B4.

Fig. 3 shows a simplified block diagram of the system of the first example with the yarn feeder ATC. The yarn feeder ATC has a tensioning unit that can be operated as an active yarn feeder. The 15 yarn feeders VC are not operated as Only four of the tensioning units of the driven yarn feeder can be seen, and the separate system controller NMT, where the setpoint controller is configured.

The individual yarns 40 from the yarn feeders ATC, VC to the workstations 1, 2, 3, ... 16 of the textile machine T are indicated in FIG.

The system controller NMT is connected to the yarn feeders ATC and VC via a communication connection K1, and is selectively connected to the machine controller M of the textile machine T via another communication connection K2. The communication connection K1 is designed as a serial communication connection. This communication connection includes, for example, a CAN bus.

Figure 4 shows the principle of specifying the setpoint value with the aid of a block diagram. The setpoint controller configured in the system controller NMT sends an inquiry about the value of the operating current of the feeder ATC. The feeder ATC can be operated with a tensioning unit via the communication connection K1: "I? "'S active yarn feeder. The tensioning unit of the active yarn feeder returns the value I of the working current. This is indicated by the two outer arrows.

From the value I of the working current of the active yarn feeder or from several values I, the setpoint controller calculates the setpoint value for the braking force, ie the correspondence for the yarn feeder VC without the tensioning unit Yarn tension, the yarn feeder VC can be operated as a driven yarn feeder.

In this example, according to the formula (1) listed above, the braking force with this value F is calculated from the value I of the operating current and the specific data spD of the active feeder, namely the parameters P1 and P2 . This value F, known as the set point value, is sent to the driven yarn feeder via the communication line K1 by the set point controller. This is indicated by the inner arrow.

Calculate the value Ii of the operating current for each yarn feeder VC without a tensioning unit. The tensioning unit can pass its processor unit from the value F for the yarn tension and the specific data spDi, which is the The parameters P1i and P2i of the feeder VC operate as a driven feeder: (2) Ii = (F-P1i) / P2i

During operation, the system controls the work station of the textile machine T with a predetermined yarn tension through a yarn feeding system with 16 yarn feeders VC, ATC. The yarn tension of the yarn 40 of the yarn feeder AC is adjusted here to the reference value Mref by the tensioning unit of the yarn feeder ATC.

The 16 yarn feeders VC and ATC form a group, wherein the yarn feeder ATC operates as a tensioning unit of the active yarn feeder. The additional yarn feeder VC without the tensioning unit is operated as a driven yarn feeder.

The setpoint controller controls the individual yarn tension of the yarns of the driven yarn feeders with the aid of the tensioning unit of the active yarn feeders.

Each of the yarn feeders VC, ATC has a storage body 3 and a braking device downstream from the storage body 3 in the yarn path.

The yarn of each of the yarn feeders VC, ATC is withdrawn from the storage body 3 by the workstations A1, A2, A3, ... A16 of the textile machine T. The yarn tension of the individual yarns of the yarn feeders VC and ATC is adjusted by the adjustment device of the braking device. The adjustment device is controlled by the braking signal.

The braking signal is adjusted by the tensioning unit of the active yarn feeder, which is used to adjust the yarn tension of the yarn of the active yarn feeder.

Each of the yarn feeders VC and ATC of the system is assigned to specific data spD. The specific data spD contains the distribution of values that determine the yarn tension as the value of the braking signal.

The yarn tension of the yarn of the individual driven yarn feeder is controlled, wherein the set point value for the braking force of the driven yarn feeder is the braking signal from the active yarn feeder by the set point controller Calculated by at least one value. The set point value is preset for the driven yarn feeder.

The yarn tension of the individual yarns of the yarn feeders VC and ATC is adjusted by the brake body 8 of the brake device. At least one adjustment element of the adjustment device acts on the brake body 8. The adjustment element is controlled by the braking signal.

For this, the yarn tension of the individual yarns of the yarn feeders VC, ATC is adjusted by the adjusting element of the adjusting device designed as a magnet element. One of the magnet elements that can move within the magnetic field of the other magnet element acts on the brake body 8. For this, the operating current of one of the two magnet elements, that is, the element designed as a working coil, is adjusted to form the braking signal.

During the active / slave operation, initialization is performed first, and then a set point value is preset. FIG. 5 shows a simplified flowchart of initialization, and FIG. 6 shows a preset simplified flowchart.

By initializing the feeder VC, ATC group during active / slave operation, as illustrated in Figure 5, the specific data spD of the active feeder is passed through the setpoint controller and placed in the pre- Inquire the driven yarn feeder in the condition.

For this, the yarn feeder ATC with the tensioning unit is defined as the active yarn feeder by the setpoint controller during the first step, and the 15 yarn feeders without the tensioning unit are defined as Driven yarn feeder.

During the second step, the set point controller queries and records the specific data spD of the active yarn feeder. The specific data spD of this example is the parameters P1 and P2 of the straight line, which assigns the value F of the braking force to the value I of the working current.

During the third step, the driven yarn feeders are assigned to the active yarn feeder by the setpoint controller.

During the fourth step, the driven yarn feeders are placed in preset conditions by the set point controller, where they are prepared to allocate the specific value Ii of the yarn tension to the delivery value of the braking force F, and adjust this value.

With the presets in the VC and ATC groups of these feeders, during the active / slave operation illustrated in FIG. 6, with the aid of the specific data spD of the active feeder, the setpoint controller calculates by The value of the braking signal of the active yarn feeder, that is, the working current of the active yarn feeder is used for the set point value of the braking force, and this is preset to the driven yarn feeders.

As already described in relation to FIG. 4, during the first step, the set point controller configured in the system controller NMT queries the value I of the active current of the active yarn feeder.

During the second step, the waiting time t, during which the working current value I is sent back by the tensioning unit of the active yarn feeder.

During the third step, the setpoint controller checks whether the value I has been sent. If this is not the case, the preset ends without controlling the driven yarn feeders.

During the fourth step, the setpoint controller calculates the setpoint value for the braking force of the yarn feeder VC without the tensioning unit from the value I of the operating current or from several values, the tensioning unit can be operated It is a driven yarn feeder.

In this example, the setpoint controller generates the filtered value of the braking signal from the value of the braking signal, that is, from the operating current I. The median time value Im is generated, for example, from the value I of the operating current, from which the set value, ie the value F for the braking force, is calculated.

During the fifth step, the setpoint value, ie the value F, is preset by the setpoint controller to the driven yarn feeder.

Repeat the preset of the set point value for the braking force value of these driven yarn feeders. This repetition occurs automatically, for example, after 100 ms, that is, with a frequency of 10 Hz.

This median time value is generated as the sliding median value Im, for example. If the earlier value I (t-1) was used together with the current value I (t) of the working current at time t, the following median value Im is obtained: (3) Im = (I (t-1) + I (t)) / 2.

This median generation system is also known as a FIR filter: another alternative system, the median Im is calculated as follows: (3a) Im (t) = (I (t) + Im (t-1)) / 2

This median generation system is also known as an IIR filter.

Alternatively, a value of 3 or earlier is included in the calculation of the sliding median.

In one example, the calculated value Im is equipped with a correction value Ik for determining the value I: (4) I = Im + Ik

The correction value Ik is greater than zero. In another option, the correction value is less than zero.

In another option, the calculated value Im is multiplied by the correction value Ic. In another option, the correction value Ic is greater than 1. In another option, the correction value Ic is less than one.

The correction value compensates for the different structure types of the feeders VC and ATC.

Second example:

The second example is equivalent to the first example, except for the features described below.

7 shows a simplified block diagram of a system with yarn feeders VC, ATC of the second example, the yarn feeders are divided into groups G1, G2, G3, G4, ... G16. The system has, for example, 256 yarn feeders VC, ATC, wherein the yarn feeders VC, ATC are divided into 16 groups G1, G2, G3, G4, ... G16, each group has 16 yarn feeders VC, ATC.

In another option, the system has, for example, 126 yarn feeders VC, ATC.

The first group G1 includes a yarn feeder ATC with a tensioning unit that can be operated as an active yarn feeder, and 15 yarn feeders VC without a tensioning unit that can be operated as a driven yarn feeder.

Each of the second and third groups G2 and G3 includes two yarn feeders ATC with a tensioning unit that can be operated as an active yarn feeder, and no puller that can be operated as a driven yarn feeder 14 yarn feeders VC of the tight unit.

The positions and addresses of the yarn feeders VC and ATC are related to the system allocation on the knitting machine.

For the second group G2, two yarn feeders VC are arranged next to the yarn feeder ATC in the first position, and the second yarn feeder ATC is arranged next to the yarn feeder ATC. For this third group G3, the yarn feeders ATC with tensioning units are arranged adjacent to each other.

The separate system controller NMT is connected to the feeders ATC, VC via the communication connection K1, and the setpoint controller is configured in the system controller NMT. The communication connection K1 is designed as a serial connection, for example with at least one CAN open bus.

Figure 8 shows the principle of specifying the setpoint value with the aid of a block diagram.

In the group G1, the preset of the set point value is performed as in the first example. The setpoint controller queries the value I of the active current of the active yarn feeder, and with the aid of the specific data of the active yarn feeder, the preset current is calculated depending on the working current I from the active yarn feeder, i.e. The value of this braking force is F (I). The value F (I) is preset for the driven yarn feeder of group G1.

The values I1 and I2 are, for example, the median calculated with the aid of equation (3) or (3a). With the aid of equation (1) for the braking force, each of the values F1 and F2 is calculated from the values I1 and I2. The value F (I1, I2) is the median of F1 and F2, for example.

In group G2, the setpoint controller inquires the working current values I1 and I2 of the two active yarn feeders. With the aid of the specific data of the active yarn feeders and by the values I1 and I2, the setpoint controller depends on the operating currents I1 and I2 to calculate the setpoint value, that is, the braking force value F (I1, I2). The value F (I1, I2) is preset for the driven yarn feeder of group G2.

The set point value of the group G3 is calculated like one of the group G2.

During operation, the yarn feeders VC, ATC are operated as active / driven yarn feeders in the first three groups G1, G2, G3.

For the driven yarn feeders for the individual groups G1, G2, G3, and for each group G1, G2, G3 separately for active / driven operation, the setpoint controller calculates the Set the point value and preset this to the driven yarn feeders of groups G1, G2, G3.

Controlling the yarn tension of the yarns of the driven yarn feeders of the first group G1, wherein the setpoint controller calculates the values of the braking signals of the active yarn feeders for the control of the driven yarn feeders The set point value of the power, and this is preset to the driven yarn feeders.

Control the yarn tension of the driven yarn feeders of the second and third groups G2, G3, where the setpoint controller is controlled by the braking signals of the two active yarn feeders of the individual groups G1, G2 Calculate the set point value of the braking force of the driven yarn feeder for each group G2, G3, and preset this to the individual group G2, G3 slave for each group G2, G3 Dynamic yarn feeder.

For this initialization, during active / slave operation, the setpoint controller queries the specific data spD of the active feeders for each group G1, G2, G3 and places these driven feeders In preset conditions.

The value of the braking signal of the active yarn feeder in the group G1 and the value of the braking signal of the two active yarn feeders in the groups G2 and G3 are assisted by the specific data spD of the active yarn feeder. The set point controller calculates the set point values for the braking force of the individual groups G1, G2, G3 and presets these to the driven yarn feeders of the individual groups G1, G2, G3; Be repeated.

In the first group G1, the set point value for the braking force is calculated by the set point controller from the value of the braking signal of the active yarn feeder.

In groups G2 and G3, the individual setpoint values for the braking force are calculated by the setpoint controller, for example, by the median value of the braking signals for the two active yarn feeders. Once the values of the braking signals are received by the active yarn feeders of the individual groups G1, G2, G3, they are received one after another as much as possible, and are used for all groups G1, G2, G3 during active / slave operation The setpoint values for the driven yarn feeders are calculated therefrom, and these values are sent to the driven yarn feeders. This process is repeated continuously.

Claims (11)

    A work station (A1, A2, A3, ... A16) for controlling the feeding of a system with several yarn feeders (VC, ATC) to a textile machine (T) with a predetermined yarn tension ) Method, wherein the yarn tension of at least one yarn of the yarn feeder (ATC) is adjusted to a reference value (Mref) by a tensioning unit of the yarn feeder (ATC), including a tensioning unit At least one yarn feeder (ATC) is operated as an active yarn feeder, and at least another yarn feeder (VC) is operated as a driven yarn feeder, wherein the yarn of the driven yarn feeder (etc.) The yarn tension of the thread is controlled by the tensioning unit of the active yarn feeder or the driven yarn feeder of the active yarn feeders, and is controlled by the assistance of a setpoint controller. Each of the yarns of the yarn feeders (VC, ATC) is pulled out from a storage body (3) by the workstation of the textile machine (T), wherein each yarn feeder has a storage body (3) And a brake device in the yarn path downstream of the storage body (3), wherein the yarn tension of the individual yarns of the feeder (VC, ATC) is adjusted by an adjustment device of the brake device And the adjusting device is controlled by a braking signal, wherein the braking signal is adjusted by the individual tensioning unit of the active yarn feeder for adjusting the yarn tension of the yarn of the active yarn feeder, wherein, For the yarn feeders (VC, ATC) of the system, each specific data (spD) is allocated, where the specific data (spD) includes the value of a braking force that determines the yarn tension is allocated to the value of the braking signal, and The yarn tension of the yarn (40) of the driven yarn feeder is controlled, wherein the set point controller calculates a braking force for the driven yarn feeder from the value of the braking signal of the active yarn feeder Set the point value and preset it to the driven yarn feeder.         A method as claimed in item 1 of the patent application, wherein the yarn tension of the individual yarns of the feeder (VC, ATC) is adjusted with the aid of at least one brake body (8) of the brake device, wherein the adjustment device At least one adjusting element acts on the braking body / the braking bodies (8), and wherein the adjusting element or the adjusting elements are / are controlled by the braking signal.         A method as claimed in item 2 of the patent application, wherein the yarn tension of the individual yarns of the yarn feeder (VC, ATC) is adjusted by an adjustment element of the adjustment device designed as a magnet element, one of the magnet elements It can move within the magnetic field of another magnet element and acts on the brake body (8), wherein an operating current that forms the braking signal of one of the two magnet elements is adjusted, the element is designed as the magnet One of the working coils of the element.         For example, the method of claim 1 or 2, wherein the yarn feeders (VC, ATC) of the system are divided into one or more groups (G, G1, G2, G3, ... G16), among which at least In a group (G, G1, G2, G3), an active / slave operation is adjusted, in which the feeders (ATC, VC) are operated as active and driven yarn feeders, which are used separately For each group with an active / slave operation, the setpoint controller calculates the setpoint value for the braking force of the driven yarn feeders of the group (G, G1, G2, G3), and this is Preset to the driven yarn feeder of this group (G, G1, G2, G3).         A method as claimed in item 4 of the patent application, in which at least one yarn feeder (ATC) with a tensioning unit is queried for each group during an initialization period with the aid of a setpoint controller during active / slave operation (G, G1, G2, G3) specific data (spD), and the driven yarn feeders are then placed in a preset condition; the set point value for the braking force is determined by the active yarn feeder The value of the braking signal is calculated and used to preset the setpoint controller with the aid of specific data (spD) of the active yarn feeder, and is preset to the driven yarn feeder; Be repeated.         A method as claimed in item 1 or 2 of the patent application, in which the filtered value by the value of the braking signal of the active yarn feeder, or a filtered value by the value of the braking signal of the active yarn feeder, by the setting The point controller calculates the set point value for this braking force.         A method as claimed in item 1 or 2 of the patent application, wherein the set point controller calculates the set point value for the braking force from one of the values of the brake signal values of at least two active yarn feeders.         A textile machine with a system for controlling the feeding of yarn to a machine with at least two yarn feeders (VC, ATC) with a predetermined yarn tension through several yarn feeders (VC, ATC) The workstation of the textile machine (T), wherein at least one yarn feeder (ATC) has a tensioning unit for adjusting the yarn tension of the yarn of the yarn feeder (ATC) to a reference value (Mref), wherein At least one yarn feeder (ATC) with a tensioning unit can be operated as an active yarn feeder, and at least one additional yarn feeder (VC) as a driven yarn feeder, and by means of this active yarn feeder The tensioning unit of the yarn feeder or the tensioning units of the active yarn feeders control the yarn tension of the yarn of the driven yarn feeder (VC) through a setpoint controller, wherein each yarn feeder ( (VC, ATC) has a storage body (3) and a braking device downstream of the yarn path by the storage body (3), wherein each of the yarns of the feeders (VC, ATC) is The work station of the textile machine (T) is withdrawn from the storage body (3), wherein the braking device has an adjusting device for adjusting the yarn tension, wherein the adjusting device is Controlled by a braking signal, wherein each of the yarn feeders (VC, ATC) is assigned a specific data spD, wherein the specific data spD includes assigning a value of a braking force that determines the yarn tension to the braking signal Value, and the setpoint controller is designed to control the yarn tension of the corresponding driven yarn feeder, wherein the setpoint value for the braking force of the driven yarn feeder is determined by the active yarn feeder The value of the braking signal is calculated and preset to the driven yarn feeder.         A textile machine as claimed in item 8 of the patent scope, wherein the brake device of the yarn feeder (VC, ATC) has at least one brake body (8) downstream of the storage body (3) in the yarn path, and has a function An adjustment device for adjusting the yarn tension, wherein at least one adjustment element of the adjustment device acts on the brake body or the brake bodies (8), wherein the adjustment element or the adjustment elements are / are based on the brake signal Controlled by.         For example, in the textile machine of claim 9, the adjustment device of the braking device includes two adjustment elements designed as magnet elements, one of which can move within the magnetic field of the other magnet element and can act on the On the brake body (8), and an operating current of one of the two magnet elements can be adjusted for adjusting the yarn tension, and the magnet element is designed as a working coil that generates the braking signal.         For example, the textile machine of patent application item 8 or 9, in which the yarn feeders (VC, ATC) of the system are divided into one or more groups (G, G1, G2, G3, ... G16), among which Adjust an active / slave operation for at least one group (G, G1, G2, G3), where the feeders (VC, ATC) are operated as active and driven yarn feeders, which are used for each group Group (G, G1, G2, G3) is the driven yarn feeder of the group (G, G1, G2, G3) and operates in active / driven mode. The setpoint controller is designed to be calculated separately This setpoint value for braking force is used to assign this to the driven yarn feeders of this group (G, G1, G2, G3).