DE102017128327B3 - Method for controlling the supply of threads of a system with several yarn feeding devices and textile machine with a system with several yarn feeding devices - Google Patents

Abstract

For controlling the supply of yarns of a system with a plurality of yarn feeding devices (VC, ATC) with a predetermined yarn tension, in which the yarn tension of at least one yarn of a yarn feeding device (ATC) is controlled by a tension unit of the yarn feeding device (ATC) to a reference value (Mref), At least one yarn feeding device (ATC) with a tension unit as a master yarn feeding device and at least one further yarn feeding device (VC) operated as a slave yarn feeding device. It is in each case the thread tension of the thread or the slave yarn feeding devices with the help of or the voltage units of or To control the thread tension of the yarn of the master or the yarn feeding devices, a brake signal is set by the corresponding tension unit. The system's yarn feeding devices (VC, ATC) are each assigned specific data (spD) Data (spD) e The thread tension of the thread (s) (40) of the one or more slave yarn feeding devices (40) is controlled by the default control unit by setting a default value for the braking force for the slave yarn feeding device (s) the one or more values of the brake signal of the master or the yarn feeding devices is determined and the slave or the yarn feeding devices or is specified.

Description

The invention relates to a method for controlling the delivery of threads of a system with a plurality of yarn feeding devices with a predetermined yarn tension to jobs of a textile machine and a textile machine with a corresponding system.

A method for supplying yarns to a textile machine for operating yarn feeding devices is known from DE 102 34 545 B4 known. In this case, the yarn feeding devices are operated under voltage control in a trial phase with matching setpoint voltages, wherein supplied amounts of yarn are detected. After the trial phase, the yarn feeding devices are controlled or controlled on the basis of a yarn quantity specification determined from the detected yarn amounts.

In the EP 2 067 886 B1 a method for feeding a plurality of yarns to a textile machine is described in which the supply takes place with a constant feed length of the yarn. Delivery devices are arranged to maintain the tension of the respective yarn each at a predetermined value. In one example, control of one of the delivery devices controls the control and regulation of the voltage of all other delivery devices.

A method for controlling the yarn delivery from a yarn feeding device to a textile machine, wherein the thread is withdrawn from a storage body of the yarn feeding device, is from the DE 10 2013 113 115 B4 known. Such yarn feeding devices are also referred to as storage yarn feeding devices. The thread tension of the thread is adjusted by a braking device in the thread path after the storage body by means of an adjustment. For this purpose, a brake signal, namely a working current, is set for the adjusting device. In a data unit for the yarn feeding device specific data are stored, which are assigned to the determination of the specific data values of the working current measured values of the thread tension.

From the DE 10 2014 118 743 A1 and from the DE 10 2015 118 027 B3 Thread feeding devices are known, each having a thread tension unit for controlling the thread tension to a reference value of the thread tension.

The US 2012/0 031 148 A1 describes a method for detecting the stopping of the yarn in knitwear lines with multiple yarn feeders, from which a circular knitting machine pulls yarns. The circular knitting machine is provided with switches, which is able to change the selection state of the yarn feeder with respect to the angular position of the circular knitting machine.

Subject of the DE 100 05 101 A1 is a method for producing a knitted or knitted fabric, wherein the thread tension of at least a portion of yarn feeding devices is adjustable by adjusting the yarn speed. In this case, according to the control of a device for specifying the yarn speed of a selected yarn feeding device, the control of the remaining yarn feeding devices is made. Deviations of the thread tensions on the remaining yarn feeding devices are compensated by readjusting of organs to adjust the mesh size.

A thread-processing system is in the US 2004/0 238 060 A1 described. The system comprises a textile machine and at least one yarn feeding device with peripheral accessories and a control device. The yarn feeding device has a local autonomous bus system connected to the control device to the accessory devices and with the control device at least one node of a main bus system.

In the US 2013/0 056 573 A1 is a method for thread delivery to z. B. discloses a metal wire processing machine. First, in a control process, the voltage is constantly controlled to keep it within a range of constant values. Second, if this condition is met, the yarn delivery speed is controlled to a possibly constant value. Thirdly, at constant speed, it is constantly checked whether the tension remains in the above-mentioned range. If not, a new control process occurs.

The object is to develop a method for controlling the supply of yarns with a predetermined yarn tension over a longer period of operation for several jobs of a textile machine and a corresponding system, wherein the cost of the yarn feeding devices are reduced.

This object is achieved with the features of the independent claims. Advantageous developments of the invention are the subject of the dependent claims.

In a method for controlling the supply of yarns of a system having a plurality of yarn feeding devices with a predetermined yarn tension to a textile machine, the yarn tension of at least one yarn of a yarn feeding device is controlled by a tension unit of this yarn feeding device to a reference value. At least one of the yarn feeding devices with a tension unit is called the master yarn feeding device and at least one further yarn feeding device is operated as a slave yarn feeding device.

In the method, the yarn tension of at least one yarn is controlled by a master yarn feeding device to a reference value and the yarn tension of at least one further, supplied by a slave yarn feeding device, thread controlled by the master yarn feeding device. The yarn tension of the yarn of the slave yarn feeding device (s) is controlled by means of the tension unit of the master yarn feeding device or the tension units of the master yarn feeding devices by a default control unit.

In an alternative, the thread tension of the thread of the slave feeder (s) is controlled by a default controller, the default controller being connected to the tension units of at least two master feeder units.

The threads are withdrawn by the jobs of the textile machine from the yarn feeding devices, wherein the yarn feeding devices each have a storage body and a braking device with an adjustment. The thread tension of the respective thread of the yarn feeding devices is adjusted by driving the corresponding adjusting device by a brake signal. The yarn feeding devices are each assigned specific data, the specific data comprising an assignment of values of a braking force determining the yarn tension to values of the braking signal.

The yarn tension of the thread of the respective slave yarn feeding device is controlled by the default control unit, a default value for the braking force for the slave yarn feeding device from the or the values of the brake signal of the master or yarn feeding devices is determined and the slave yarn feeding device is specified.

The default control unit, which is designed to control the thread tension of the thread of the slave or the yarn feeding devices, is provided in the tension unit of the master yarn feeding device.

In an alternative, the default controller is provided in a separate system controller or as a separate system controller. The separate system control unit is connected to the tension unit of the master yarn feeding device.

In this method, a plurality of yarn feeding devices without voltage control unit can be operated as slave yarn feeding devices and be used with one or more operated as a master yarn feeding device yarn feeding devices with a yarn tension control unit. Yarn feeding devices without tension control unit are less expensive and cheaper to produce. In this case, yarn feeding devices are to be used, which are each assigned specific data that includes an assignment of values of the yarn tension to values of the braking signal. Such yarn feeding devices are from the DE 10 2013 113 115 B4 known.

In one embodiment, the thread tension of the respective thread of the yarn feeding devices is adjusted by at least one brake body of the braking device, wherein at least one adjusting element of the adjusting acts on the brake body or brakes, and wherein the one or more adjusting elements are controlled by the brake signal.

In one embodiment, the thread tension of the respective thread of the yarn feeding devices is set by adjusting elements of the adjusting device designed as magnetic elements, one magnetic element being movable in the magnetic field of another magnetic element and acting on the brake body, a working current forming one of the two magnetic elements forming the brake signal being designed as a working coil Magnetic element is set.

In one embodiment, the yarn feeding devices of the system are divided into one or more groups. In at least one of the groups, a master-slave operation is set by operating the yarn feeding devices as master and slave yarn feeding devices. By the default control unit for each group with master-slave operation separately determined the default value for the braking force for the slave or the yarn feeding devices of the group and the slave or the yarn feeding devices of the group specified.

In one embodiment, an initialization is performed before the default value is specified.

During the initialization, the specific data of at least the yarn feeding devices with the tension unit are interrogated by the default control unit for each group in the master-slave mode and the slave yarn feeding devices are put into a default state.

In the default setting, the default value for the braking force is respectively determined by the default control unit from the value (s) of the brake signal of the master thread supply device (s) with the aid of the specific data of the master thread supply device (s) and Yarn feeding devices specified. If necessary, the specification is repeated.

In an alternative, the default is repeated continuously. The repetition is done in an example with a frequency in the range of 10 Hz, d. H. each about 100 ms.

In one embodiment, the default value for the braking force is determined by the default control unit from a filtered value of the values of the brake signal of the master thread feeders or from filtered values of the brake signals of the master thread feeders.

In one example, a filtered value is an average of the values of the brake signals of the respective master thread feeder. In an alternative, the filtered value is a moving average of the values of the brake signal.

For example, in the case of several master thread feeding devices, the default control unit determines an average value from the filtered values.

In one embodiment, infinite impulse response filters (IIR filters) or alternatively finite impulse response filters (FIR filters) are used to determine an average value.

In one embodiment, the default value for the braking force by the default controller is determined from an average of values of the brake signals from at least two master thread feeders.

The features and advantages of the device claims correspond to those of the method claims.

A textile machine is provided with a system for controlling the supply of yarns with a plurality of yarn feeding devices with a predetermined yarn tension to work stations of the textile machine. The system comprises at least two yarn feeding devices, for example at least one yarn feeding device with a tensioning unit and at least one yarn feeding device without a yarn tensioning device.

In the yarn feeding device with tension unit, the tension unit for regulating the thread tension of the yarn of the yarn feeding device is designed to a reference value. At least one yarn feeding device with a tension unit is operable as a master yarn feeding device and at least one further yarn feeding device is operated as a slave yarn feeding device, wherein in each case the yarn tension of the thread of the or the slave yarn feeding devices by means of the tension unit of the master yarn feeding device or the tension units of the master yarn feeding devices a default control unit is controlled.

The yarn feeding devices each have a storage body and a braking device in the yarn path after the storage body, wherein the threads of the yarn feeding devices are each deducted from the storage body by the jobs of the textile machine. The brake device has an adjustment device for adjusting the thread tension, wherein the adjustment device is controlled by a brake signal.

The yarn feeding devices of the system are each assigned specific data, the specific data comprising an assignment of values of a braking force determining the yarn tension to values of the braking signal.

The default control unit is designed to control the thread tension of the respective slave yarn feeding device by determining the default value for the braking force for the slave yarn feeding device from the one or more values of the braking signal of the master thread feeding device (s) and to specify the one or more slave yarn feeding devices is.

In one embodiment, the braking device of the yarn feeding devices on at least one brake body in the thread path after the storage body and an adjustment for adjusting the thread tension, wherein at least one adjusting element of the adjusting acts on the brake body or, and wherein the one or more adjusting elements are controlled by the brake signal.

In one embodiment, the adjusting device of the braking device comprises two adjusting elements designed as magnetic elements, wherein one magnetic element is movable in the magnetic field of the other magnetic element and can be acted upon by the brake body.

To adjust the thread tension is a brake signal forming working current of the two magnetic elements, designed as a working coil magnetic elements, adjustable.

In one embodiment, the yarn feeding devices of the system are divided into one or more groups. In at least one group, a master-slave operation is adjustable by the yarn feeding devices are operated as master and slave yarn feeding devices. The default control unit is configured to determine separately for each group with master-slave operation the default value for the braking force for the group or slave yarn feeding devices of the group and to specify the slave or the yarn feeding devices of the group.

• 1 eine schematische Darstellung eines Fadenliefergerätes ohne Fadenspannungseinheit anhand einer Seitenansicht;
• 2 eine schematische Darstellung eines Fadenliefergerätes mit einer Fadenspannungseinheit anhand einer Seitenansicht;
• 3 ein vereinfachtes Blockschaltbild einer Textilmaschine mit einem System mit mehreren Fadenliefergeräten eines ersten Beispiels;
• 4 ein Ausschnitt des Blockschaltbilds der 3 mit Pfeilen zur Darstellung der Kommunikation einer Vorgabe;
• 5 ein vereinfachtes Ablaufdiagramm einer Initialisierung;
• 6 ein vereinfachtes Ablaufdiagramm einer Vorgabe eines Vorgabewertes;
• 7 ein vereinfachtes Blockschaltbild eines Systems mit mehreren Fadenliefergeräten eines zweiten Beispiels, wobei die Fadenliefergeräte in Gruppen unterteilt sind; und
• 8 ein Blockschaltbild der ersten beiden Gruppen der 7 mit Pfeilen zur Darstellung der Kommunikation einer Vorgabe.

The invention will be further explained with reference to two examples schematically illustrated in the drawing. Show it:

• 1 a schematic representation of a yarn feeding device without thread tension unit based on a side view;
• 2 a schematic representation of a yarn feeding device with a yarn tension unit based on a side view;
• 3 a simplified block diagram of a textile machine with a system with multiple yarn feeding devices of a first example;
• 4 a section of the block diagram of 3 with arrows for representing the communication of a specification;
• 5 a simplified flow chart of an initialization;
• 6 a simplified flowchart of a default of a default value;
• 7 a simplified block diagram of a system with multiple yarn feeding devices of a second example, wherein the yarn feeding devices are divided into groups; and
• 8th a block diagram of the first two groups of 7 with arrows to represent the communication of a specification.

A textile machine T with a system for controlling the supply of yarns having a predetermined yarn tension to work stations of a textile machine comprises a plurality of yarn feeding devices VC . ATC , The system includes yarn feeding devices VC without tension unit and yarn feeding devices ATC each with a tension unit for controlling the thread tension of the thread 40 the yarn feeding device ATC , At least one yarn feeding device ATC is as a master yarn feeding device and at least one other yarn feeding device VC is operable as slave thread feeding device.

First example:

In a first example, the system has a group of 16 Yarn feeding devices on. A yarn feeding device ATC with a tension unit is operable as a master yarn feeding device and 15 Yarn feeding devices VC without tension unit can be operated as slave thread supply units. 1 shows a schematic representations of a yarn feeding device VC without voltage unit and 2 a corresponding representation of a yarn feeding device ATC with a voltage unit. A simplified block diagram of the textile machine T with the system with the 16 Yarn feeding devices ATC . VC is in 3 shown.

1 shows one of the yarn feeding devices VC , which is designed as a storage yarn feeding device. The yarn feeding device VC has a holder 2 , a take-up unit, a storage body 3 from which the thread 40 through a job A1 . A2 . A3 , ... A16 (see. 3 ) of the textile machine T is pulled off, and a brake device for adjusting a thread tension on. The brake device comprises an adjustment device, wherein the adjustment device for adjusting the thread tension is controlled by a brake signal. The textile machine T is for example a circular knitting machine.

The holder 2 is with a fastening device 4 for fastening the yarn feeding device VC at the textile machine T , for example on a machine ring of the circular knitting machine.

The storage body 3 is as a storage drum with an axis 5 educated. At the rewinding, in the 1 at the right end, the storage body 3 , the take-up unit is for winding yarn turns, ie turns of the thread, onto the storage body 3 arranged. The take-up unit is provided with one in a drive housing 6 arranged drive and a driven by the drive take-up 7 Mistake.

The holder 2 extends parallel to the axis 5 along the storage body 3 , The drive housing 6 is at the rewinding, in 1 at the right end, the storage body 3 on the holder 2 attached.

The brake device for adjusting a thread tension of the thread 40 has a brake body 8th and the adjustment device for the brake body 8th on. The brake body 8th is in the thread path after the storage body 3 arranged, wherein it is drawn at dashed lines withdrawal end of the storage body 3 is arranged. A housing 9 the braking device is on a drive housing 6 opposite end of the storage body to the holder 2 attached.

The brake body 8th is conical, as a compliant brake body cone in the form of a regular truncated cone, formed. For example, it is made of a plastic and / or metal. Corresponding or similar brake bodies are for example in the WO 2006/045 410 A1 described.

The axle of the brake body 8th is in essence, ie, except for minor deviations z. B. by lifting through the thread 40 or upon deformation of the elastic brake body 8th , with the axis 5 of the storage body 3 match. The withdrawal end of the storage body 3 is rounded and forms an annular clamping surface in the area of the rounding off 10 , The brake body 8th sticks out with his larger diameter over the clamping surface 10 , He is through the adjustment against the clamping surface 10 at the end of the storage body 3 be pressed.

When pulling the thread 40 through the textile machine T the thread is running 40 from the storage body 3 through the gap between the discharge end of the storage body 3 and the brake body 8th over the clamping surface 10 ,

The adjusting device has adjusting elements, namely magnetic elements, wherein a magnetic element in the magnetic field of another magnetic element is movable and on the brake body 8th acts. One of the magnetic elements is designed as a working coil. In this example, the adjustment device comprises a permanent element, hereinafter PM element, and the 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 in 1 not visible. The working coil acts on the brake body 8th one. The working coil works on the principle of a plunger coil, which English is called "voice coil".

The magnetic elements of the adjusting device can be controlled by a brake signal, namely by a working current for the working coil. Upon contact with the brake body 8th performs an action on the working coil with a certain working current to a possibly small, axial movement of the working coil and thus to a change in the contact pressure of the brake body 8th against the clamping surface 10 , By changing the contact force, a desired thread tension is set.

For complete relief of the brake body 8th the working current is changed so that the working coil is moved back into a position in which they the brake body 8th no longer subjected to a contact force.

The holder 2 forms starting from the housing 9 an electronics chamber e in which electronic elements of the adjusting device, such as a current supply unit, are arranged to control the working coil. In 1 is the area of the electronics chamber e above the housing 9 to see.

Such a braking device is in the DE 10 2013 113 115 A1 and the DE 10 2013 113 122 A1 described.

2 shows the yarn feeding device ATC with a tension unit that is a thread feeding device VC without tension unit, except for the features described below.

The yarn feeding device ATC additionally comprises a tension unit for controlling the thread tension with a tension measuring unit comprising a thread tension sensor 50, a measuring device 51 and a connection 52 having. 2 schematically shows the yarn tension sensor 50 with the measuring device indicated by arrows 51 , the thread course behind the case 9 ie in 2 on the left, is arranged. The measuring device 51 of the thread tension sensor 50 is about the connection 52 with the yarn feeding device 1 connected. The yarn tension sensor 50 is attached to the housing 9.

The in 1 and 2 shown yarn feeding devices VC . ATC are each specific data SPD assigned. The specific data SPD comprise an assignment of values of a braking force determining the thread tension to values of the brake signal, ie to values I of the working current.

The yarn feeding devices VC . ATC each have a processor unit with a data unit for the output of the respective yarn feeding device VC . ATC specific data spD. The data unit is designed to provide the specific data spD. The specific data spD comprises an assignment of values of the braking signal, namely values I of the working current to measured values F of the braking force determining the thread tension. Ie. the data unit contains for the respective yarn feeding device VC . ATC Values I of the working current, which are assigned to specific values F of the braking force.

To determine the specific data SPD the values I of the working current are measured F assigned to the braking force.

For example, to determine the specific data spD on the basis of braking force-current curves, the value F of the braking force caused depends on the value I of the working current in the working coils 12 measured.

In one example, to determine the specific data spD of a yarn feeding device VC . ATC by the at z. B. increasing values I of the working current measured values F of the braking force a straight line. The specific data SPD , in this example the parameters P1 . P2 the straight line which assigns the values F of the braking force to the values I of the working current: $$\text{F}=\text{P1}+\text{P2}\times \text{I}\text{,}$$

A determination and use of specific data is in the DE 10 2013 113 115 B4 described.

3 shows the simplified block diagram of the system of the first example with the operable as a master yarn feeding device yarn feeding device ATC with voltage unit, the 15 as a slave yarn feeding devices operable yarn feeding devices VC without voltage unit, of which only four can be seen, and the separate system control unit NMT in which a default control unit is arranged.

In 3 is the particular thread 40 the yarn feeding device ATC . VC to a job 1 . 2 . 3 , ... 16 the textile machine T indicated.

The system controller NMT is via a communication connection K1 with the yarn feeding devices ATC . VC and optionally via another communication link K2 with a machine control M the textile machine T connected. The communication connection K1 is designed as a serial communication link. The communication link includes z. B. a CAN bus.

4 shows on the basis of a block diagram the principle of a specification of a default value. The in the system control unit NMT arranged default controller sends over the communication link K1 a question about the value I of the working current of the yarn feeding device which can be operated as a master yarn feeding device ATC with voltage unit: "I?". By the tension unit of the master yarn feeding device, the value I of the working current is sent back. This is symbolized by the two outer arrows.

By the default control unit is from the value I of the working current of the master yarn feeding device or a plurality of values I is a default value for the braking force, ie for the corresponding yarn tension, which can be operated as slave yarn feeding devices yarn feeding devices VC determined without voltage unit.

In this example, a braking force with the value F is determined from the value I of the working current and the specific data spD of the master yarn feeding device, namely the parameters P1 and P2, according to the formula (1) given above. This value, called the default value F is passed through the default controller via the communication line K1 sent to the slave thread feeders. This is symbolized by the inner arrows.

For each yarn feeding device that can be operated as a slave yarn feeding device VC without a unit of tension, its processor unit uses the value F for the thread tension and the specific data spD _i , namely the parameters P1 _i and P2 _i , of the yarn feeding device VC the value I of the working current determines: $${\text{I}}_{\text{i}}=\left(\text{F}-{\text{P1}}_{\text{i}}\right){\text{/ P2}}_{\text{i}}$$

In operation, the supply of threads of the system with 16 Yarn feeding devices VC . ATC with a predetermined yarn tension to work stations of the textile machine T controlled. At this time, the thread tension of the thread becomes 40 the yarn feeding device ATC through the tension unit of the yarn feeding device ATC regulated to a reference value Mref.

The 16 Yarn feeding devices VC . ATC form a group, wherein the yarn feeding device ATC operated with tension unit as master thread feeding device. The other yarn feeding devices VC without tension unit are operated as slave thread feeders.

By a default control unit respectively the thread tension of the thread of the slave yarn feeding devices is controlled by means of the tension unit of the master yarn feeding device.

The yarn feeding devices VC . ATC each have a storage body 3 and a braking device in the thread path after the storage body 3 on.

The threads of the yarn feeding devices VC . ATC are each through the job A1 . A1 . A3 , ... A16 of the textile machine T from the storage body 3 deducted. The thread tension of the respective thread of the yarn feeding devices VC . ATC is adjusted by an adjustment of the brake device. The adjusting device is controlled by a brake signal.

To control the thread tension of the yarn of the master yarn feeding device, the brake signal is adjusted by the tension unit of the master yarn feeding device.

The yarn feeding devices VC . ATC of the system are each assigned specific data spD. The specific data SPD comprise an assignment of values of the thread tension determining braking force to values of the brake signal.

The thread tension of the thread of each slave yarn feeding device is controlled by the default control unit, a default value for the braking force for the slave yarn feeding device from at least one value of the brake signal of the master yarn feeding device is determined. The default value is specified for the slave yarn feeder.

The thread tension of the respective thread of the yarn feeding devices VC . ATC is through the brake body 8th set the braking device. At least one adjusting element of the adjusting device acts on the brake body 8th one. The actuators are controlled by the brake signal.

For this purpose, the thread tension of the respective thread of the yarn feeding devices VC . ATC set by trained as magnetic elements adjusting elements of the adjustment. One of the magnetic elements, which is movable in the magnetic field of the other magnetic element, acts on the brake body 8th one. Here, a brake signal forming working current of one of the two magnetic elements, as a working coil 12 trained magnetic element, set.

In master-slave mode, an initialization and then a specification of a default value is performed first. 5 shows a simplified flow chart of an initialization and 6 a simplified flowchart of a specification.

At an in 5 illustrated initialization of the group of yarn feeding devices VC . ATC In master-slave operation, the specific data is provided by the default control unit SPD queried the master yarn feeding device and the slave yarn feeding devices placed in a default state.

In this case, in a first step by the default control unit, the yarn feeding device ATC defined with tension unit as master thread feeding device and the 15 Yarn feeding devices VC without tension unit defined as slave thread feeders.

In a second step, the default control unit makes the specific data SPD the master thread feeding device queried and stored. The specific data SPD are the parameters in this example P1 and P2 the straight line, the values F the braking force to the values I the working current assigns.

In a third step, the slave thread feeding devices are assigned to the master delivery device by the default control unit.

In a fourth step, the slave thread feeders are set by the default control unit in a default state in which they are ready, a sent value F the braking force their specific value I _i To assign the thread tension and set this value.

At an in 6 presented specification in the group of yarn feeding devices VC . ATC In the master-slave mode, the default value for the braking force from the value of the brake signal of the master yarn feeding device, ie from the working stream of the master yarn feeding device, using the specific data by the default control unit SPD of the master yarn feeding device determined and the slave yarn feeding devices specified.

As already related to 4 is explained in a first step by the in the system control unit NMT arranged default control unit by value I of the working flow of the master yarn feeding device asked.

In a second step, there is a time t waited in the by the tension unit of the master yarn feeding device the value I of the working current is sent back.

In a third step, the default control unit checks whether the value I was sent. If this is not the case, the specification without controlling the slave yarn feeding devices is terminated.

In a fourth step, the value is determined by the default control unit I of the working current or of a plurality of values, a default value for the braking force of the yarn feeding devices which can be operated as slave yarn feeding devices VC determined without voltage unit.

In this example, the value of the brake signal, ie from the working current I , formed by the default control unit, a filtered value of the brake signal. For example, from the values I of the working current, a time average I _m formed, from which the default value, ie the value F for the braking force is determined.

In a fifth step, the default value, ie the value F , Predetermined by the default control unit the slave yarn feeding devices.

The specification of the default value for the values of the braking force of the slave yarn feeding devices is repeated. The repetition is automatic, z. After 100 ms, d. H. with a frequency of 10 Hz.

The time average is z. B. as a moving average I _m educated. When using an earlier value I ( t-1 ) and the current value I ( t ) of the working current at the time t the following average results I _m : $${\text{I}}_{\text{m}}=(\text{I}\left(\text{t}-1\right)+\text{I}\left(\text{t}\right)\text{/ 2}\text{,}$$

This averaging is also referred to as an FIR filter.

Alternatively, the mean becomes I _m calculated as follows: $${\text{I}}_{\text{m}}\left(\text{t}\right)=\left(\text{I}\left(\text{t}\right)+{\text{I}}_{\text{m}}\left(\text{t}-1\right)\right)\text{/ 2}$$

This averaging is also called an IIR filter.

Alternatively 3 or more previous values included in the calculation of a moving average.

In an example is used to determine the value I the determined value I _m provided with a correction value I _k : $$\text{I}={\text{I}}_{\text{m}}+{\text{I}}_{\text{k}}$$

The correction value I _k is greater than zero. In an alternative, the correction value is less than zero.

In an alternative, the determined value I _m with a correction value I _c multiplied. In an alternative, the correction value I _c greater than 1 , In another alternative, the correction value I _c less than 1 ,

The correction values resemble different designs of the yarn feeding devices VC . ATC out.

Second example:

The second example corresponds to the first example except for the features described below.

7 shows the simplified block diagram of the system with the yarn feeding devices VC . ATC of the second example, in several groups G1 . G2 . G3 . G4 , ... G16 are divided. The system has z. B. 256 yarn feeding devices VC . ATC on, with the yarn feeding devices VC . ATC in 16 groups G1 . G2 . G3 . G4 , ... G16 with each 16 Yarn feeding devices VC . ATC are divided.

In one alternative, the system z. B. 126 Yarn feeding devices VC . ATC on.

The first group G1 comprises a thread feeding device operable as a master yarn feeding device ATC with voltage unit and 15 as a slave yarn feeding devices operable yarn feeding devices VC without voltage unit.

The second and the third group G2 and G3 each comprise two as a master yarn feeding devices operable yarn feeding devices ATC with voltage unit and 14 as a slave yarn feeding devices operable yarn feeding devices VC without voltage unit.

The position and address of the yarn feeding devices VC . ATC are important for the system assignment on the knitting machine.

At the second group G2 are next to a yarn feeding device ATC at a 1 , Position two yarn feeding devices VC and next to it the second yarn feeding device ATC arranged. At the third group G3 are the yarn feeding devices ATC arranged side by side with voltage unit.

The separate system controller NMT in which a default control unit is located is via the communication link K1 with the yarn feeding devices ATC . VC connected. The communication connection K1 is as a serial connection, z. B. with at least one CAN open BUS trained.

8th shows on the basis of a block diagram the principle of a specification of the default value.

In group G1 the specification of the default value is carried out as in the first example. The default control unit becomes the value I the working current of the master yarn feeding device queried and from it with the help of the specific data of the master yarn feeding device, the default value, namely the value F ( I ) of the braking force as a function of the working current I determined. The value F ( I ) becomes the slave thread feeders of the group G1 specified.

The values I1 and I2 For example, averages are calculated according to equation (3) or (3a). From the values I1 and I2 each value F1 and F2 determined according to equation (1) for the braking force. The value F ( I1 . I2 ) is, for example, an average F1 and F2 ,

In the group G2 become the values by the default control unit I1 and I2 the working current of the two master yarn feeding devices requested. From the values I1 and I2 the default value, namely the value F, is set by the default control unit with the aid of the specific data of the master yarn feed devices. I1 . I2 ) of the braking force as a function of working currents I1 and I2 determined. The value F ( I1 . I2 ) becomes the slave thread feeders of the group G2 specified.

In the group G3 the default value is the same as in the group G2 determined.

In operation are in the first three groups G1 . G2 . G3 the yarn feeding devices VC . ATC operated as master and slave yarn feeding devices.

By the default control unit is for each of the groups G1 . G2 . G3 with master-slave operation separately the default value for the braking force for the slave yarn feeding devices of the respective group G1 . G2 . G3 determined and the slave or the yarn feeding devices of the group G1 . G2 . G3 specified.

The thread tension of the threads of the slave yarn feeding devices of the first group G1 is controlled by the default control unit, a default value of the braking force for the slave yarn feeding devices from the values of the brake signal of the master yarn feeding device is determined and the slave yarn feeding devices is specified.

The thread tension of the threads of the slave yarn feeding devices of the second and third group G2 . G3 is controlled by the default controller for each of the groups G2 . G3 a default value of the braking force for the slave yarn feeding devices of the respective group G2 . G3 from the values of the brake signals of the two master thread feeders of the respective group G1 . G2 determined and the slave yarn feeding devices of the respective group G2 . G3 is given.

For each group G1 . G2 . G3 In the master-slave mode, the specific data is given by the default control unit during initialization SPD queried the master yarn feeding devices and put the slave yarn feeding devices in a default state.

In the default setting, the default control unit sets the default value for the braking force of the respective group G1 . G2 . G3 from the value of the brake signal of the master yarn feeding device in the group G1 and from the values of the brake signals of the two master thread feeders in the groups G2 and G3 with the help of specific data SPD of the master or yarn feeding devices and determines the slave yarn feeding devices of the respective groups G1 . G2 . G3 predefined; and the default is repeated.

In the first group G1 the default value for the braking force is determined by the default control unit from the value of the brake signal of the master yarn feeding device.

In the groups G2 and G3 In each case, the default value for the braking force is determined by the default control unit, for example, from an average of the values of the brake signals of the two master yarn feeding devices. Once for all groups G1 . G2 . G3 in master-slave mode, possibly one after the other, the values of the brake signals were received by the master yarn feeding devices and from these the default values for the slave yarn feeding devices of the respective groups G1 . G2 . G3 are determined, they are sent to the slave thread feeders. This process is repeated continuously.

LIST OF REFERENCE NUMBERS

1

Yarn feeder

2

holder

3

storage body

4

fastening device

5

axis

6

drive housing

7

takeup

8th

Brake body of the brake device

9

casing

10

clamping surface

e

electronics compartment

40

thread

50

Thread tension sensor

51

measuring device

52

connection

K1

communication link

K2

communication link

M

machine control

NMT

central control device

T

textile machine

Claims (11)

Method for controlling the supply of yarns of a system with a plurality of yarn feeding devices (VC, ATC) with a predetermined yarn tension to workstations (A1, A2, A3, ... A16) of a textile machine (T), wherein the yarn tension of at least one yarn of a yarn feeding device ( ATC) is controlled by a tension unit of the yarn feeding device (ATC) to a reference value (Mref), wherein at least one yarn feeding device (ATC) is operated with a tension unit as a master yarn feeding device and at least one further yarn feeding device (VC) as a slave yarn feeding device, in each case the yarn tension of the yarn of the slave yarn feeding device (s) is controlled by a master control unit by means of the tension unit of the master yarn feeding device or the tension units of the master yarn feeding device, the yarn feeding device (VC, ATC) threads each having a storage body (3) and a braking device in the thread path after the storage body (3) au in each case through the workstation of the textile machine (T) of the storage body (3) is withdrawn, wherein the thread tension of the respective thread of the yarn feeding devices (VC, ATC) adjusted by an adjustment of the braking device and the adjusting device is driven by a brake signal, wherein the brake signal is adjusted in each case by the tension unit of the master yarn feeding device for controlling the thread tension of the thread of the master or the yarn feeding device, wherein the yarn feeding devices (VC, ATC) of the system respectively specific data ( spD), wherein the specific data (spD) comprises an association of values of a braking force defining the yarn tension with values of the braking signal, and the yarn tension of the yarn (s) (40) of the slave yarn feeding device (s) is controlled by the default control unit a default value for the braking force for the slave yarn feeding device (s) is determined from the one or more values of the braking signal of the master yarn feeding device (s) and predetermined for the one or more slave yarn feeding devices. Method according to Claim 1 , characterized in that the thread tension of the respective thread of the yarn feeding devices (VC, ATC) is adjusted by at least one brake body (8) of the braking device, wherein at least one adjusting element of the adjusting device acts on the one or more brake bodies (8), and wherein the one or more Actuators are controlled by the brake signal. Method according to Claim 2 , characterized in that the thread tension of the respective thread of the yarn feeding devices (VC, ATC) is adjusted by magnetic elements designed as adjusting elements of the adjusting device, wherein a magnetic element in the magnetic field of another magnetic element is movable and acting on the brake body (8), wherein a brake signal forming working current of one of the two magnetic elements, designed as a working coil magnetic element is set. Method according to one of Claims 1 to 3 , characterized in that the yarn feeding devices (VC, ATC) of the system are subdivided into one or more groups (G, G1, G2, G3, ... G16), wherein in at least one group (G, G1, G2, G3) a master-slave operation is set by the yarn feeding devices (ATC, VC) are operated as master and slave yarn feeding devices, with the default control unit for each group with master-slave operation separately the default value for the braking force for Slave yarn feeding devices of the group (G, G1, G2, G3) determined and the or the slave yarn feeding devices of the group (G, G1, G2, G3) is specified. Method according to Claim 4 , characterized in that for each group (G, G1, G2, G3) in master-slave operation at an initialization by the default control unit, the specific data (spD) at least the yarn feeding devices (ATC) are queried with voltage unit and the slave yarn feeding devices be put into a default state; in the case of a specification by the default control unit, the default value for the braking force is determined from the value (s) of the brake signal of the master or yarn feeder (s) with the aid of the specific data (spD) of the master or yarn feeder (s) and specified to the slave yarn feeder (s); and if necessary the default is repeated. Method according to one of Claims 1 to 5 , characterized in that the default value for the braking force by the default control unit is determined from a filtered value of the values of the brake signal of the master yarn feeding device or from filtered values of the values of the braking signals of the master yarn feeding devices. Method according to one of Claims 1 to 6 characterized in that the default value for the braking force by the default control unit is determined from an average of values of the brake signals from at least two master yarn feeding devices. Textile machine with a system for controlling the supply of yarns with a plurality of yarn feeding devices (VC, ATC) with a predetermined yarn tension to work stations of the textile machine (T) with at least two yarn feeding devices (VC, ATC), wherein at least one yarn feeding device (ATC) a tension unit for control the yarn tension of the thread of the yarn feeding device (ATC) to a reference value (Mref), wherein at least one yarn feeding device (ATC) with tensioning unit as a master yarn feeding device and at least one further yarn feeding device (VC) is operated as a slave yarn feeding device, and wherein in each case the yarn tension the thread of the or the slave yarn feeding devices (VC) by means of the tension unit of the master yarn feeding device or the tension units of the master yarn feeding devices is controlled by a default control unit, wherein the yarn feeding devices (VC, ATC) each have a storage body (3) and a braking device in Thread course after the Speic having herkörpers (3), wherein the threads of the yarn feeding devices (VC, ATC) respectively by the workstations of the textile machine (T) are deducted from the storage body (3), wherein the braking device comprises a setting device for adjusting the thread tension, wherein the adjusting device by a Brake signal is driven, wherein the yarn feeding devices (VC, ATC) are each assigned specific data spD, the specific data spD an assignment of values a braking force determining the thread tension to values of the brake signal, and the default control unit is adapted to control the thread tension of the respective slave yarn feeding device by the default value for the braking force for the slave yarn feeding device from the or the values of the braking signal of the master or master Thread delivery devices is determined and the or the slave yarn feeding devices is specified. Textile machine after Claim 8 , characterized in that the braking device of the yarn feeding devices (VC, ATC) at least one brake body (8) in the thread path after the storage body (3) and an adjustment device for adjusting the thread tension, wherein at least one adjusting element of the adjusting device on the or the brake body (8 ), wherein the one or more adjusting elements is controlled by the brake signal. Textile machine after Claim 9 , characterized in that the adjusting device of the braking device comprises two actuating elements designed as magnetic elements, wherein a magnetic element in the magnetic field of the other magnetic element is movable and on the brake body (8) can be acted upon, and wherein the setting of the thread tension, the brake signal forming working current of the two Magnetic elements, as a working coil (12) formed magnetic elements, is adjustable. Textile machine according to one of Claims 8 to 10 , characterized in that the yarn feeding devices (VC, ATC) of the system are subdivided into one or more groups (G, G1, G2, G3, ... G16), wherein in at least one group (G, G1, G2, G3) a master-slave operation is adjustable by the yarn feeding devices (VC, ATC) are operated as master and slave yarn feeding devices, wherein the default control unit is designed for each group (G, G1, G2, G3) with master-slave Operation separately to determine the default value for the braking force for the slave or the yarn feeding devices of the group (G, G1, G2, G3) and to specify the slave or the yarn feeding devices of the group (G, G1, G2, G3).

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