CN110950182B

CN110950182B - Method and device for detecting thread loops on workstations of a textile machine producing bobbins

Info

Publication number: CN110950182B
Application number: CN201910917529.2A
Authority: CN
Inventors: M·伊丁; M·蒙德
Original assignee: Saurer Spinning Solutions & CoKg GmbH
Current assignee: Saurer Spinning Solutions & CoKg GmbH
Priority date: 2018-09-26
Filing date: 2019-09-26
Publication date: 2021-04-16
Anticipated expiration: 2039-09-26
Also published as: JP7346200B2; DE102018007591A1; JP2020050525A; CN110950182A

Abstract

The invention relates to a method and a device for detecting thread loops at a workstation of a textile machine producing bobbins. The station (2) has a thread tension sensor (20), and after a thread cut or a thread break, the thread portion of the thread (16) received by the winding drum (5) is transferred into the detection range of the thread tension sensor (20), and the thread (16) is wound onto the winding drum (5) with a controlled thread tension after the completion of a thread joining process (150) after the thread transfer (110). A line tension profile is generated from the detection signal (A-F) of the line tension sensor (20) with a comparison section (51; 61; 71) having at least one course detectable by the line tension sensor (20) which extends at least over a range from the course of the line transfer (110) up to the course of the closed-loop control of the line tension during winding (180).

Description

Method and device for detecting thread loops on workstations of a textile machine producing bobbins

Technical Field

The invention relates to a method and a device for detecting a thread loop at a workstation of a textile machine producing bobbins.

Background

Textile machines producing bobbins, such as automatic winding machines, have long been known and are described in detail in the patent literature by means of a large number of publications. Such textile machines usually consist of a plurality of stations aligned with one another, each station having a different thread processing or thread monitoring device. Such thread processing or thread monitoring devices are, for example, thread feeding devices for feeding a thread, winding devices for winding the fed thread onto a winding reel, splicing devices for splicing after cutting or breaking of the thread, thread tension sensors arranged between the splicing devices and the winding devices, and thread capture devices for carrying out the following processes: a process for capturing the end of the thread extending onto the winding reel after the thread is cut or broken; and a process for transferring the captured wire end to a wiring device, in which a portion of the wire enters a detection range of the wire tension sensor.

The workstations may also have workstation computers that are connected to line processing or line monitoring equipment. Typically, the respective station computers are also connected to the central control unit of the automatic winding machine, preferably via a bus connection.

At the workstations of such automatic winding machines, the spinning bobbins, which are preferably produced on ring spinning machines and have relatively little yarn material, are rewound into winding bobbins of large volume (for example in the form of cross-wound bobbins), which are necessary on downstream textile machines (for example looms) in the production process.

The quality of the yarn material of the spinning bobbin is also improved by removing thread defects, such as thick knots and thin knots, during the rewinding process. This means that the extended thread which is released from the spinning bobbin is monitored by a so-called clearer, which will perform the cutting and clearing of thread defects when thread defects are detected.

During the rewinding process, the extended wire is also continuously scanned by a wire tension sensor, and a wire tensioner maintains the wire tension at a defined level. This should ensure that the thread is wound as uniformly as possible on the cross-wound bobbin.

In order to obtain high productivity with such automatic winding machines, rewinding is also carried out at winding speeds as high as possible. A single ring or a whole yarn layer (i.e. a pile of multiple rings) may, among other things, protrude from a feed package configured as a thread feeding device or from a spinning bobbin. The latter occurs in particular on soft-wound or damped spinning bobbins. The yarn layers form clews. These rings or lumps can be detected by a clearer arranged in the course of the line, triggering the cutting of the clearer. Even if the system-dependent dead time between the cutting signal and the actual clearing cut is in the millisecond range, at high winding speeds, it is not possible to prevent the coil or loop from already extending onto the winding drum at the time of cutting. Winding drums with such a ring cause considerable quality problems during subsequent handling and should therefore always be avoided.

In addition, the clearer may not detect the loops of the thread, which may be caught or stuck in an undesirable manner along the thread path on sensitive components of the station, causing damage to these components. One such sensitive member is, for example, a finger guide which moves back and forth in front of the winding reel to lay the thread onto the winding reel. Such finger guides are disclosed, for example, in document DE 102007043310 a 1.

In addition to the removal by means of a clearer, a number of other measures are known in the prior art for preventing the winding of thread loops onto the winding reel. For example, document DE 7108998U describes a device for removing loops from a continuously extending wire. The device includes: a wire brake; a deflecting pin connected downstream in the line extending direction; and an array of needles disposed adjacent thereto, the thread passing through the needles or hooks of the array immediately after passing through the deflecting pin.

Published document DE 102010049435 a1 proposes a device having a catching element preventing the winding of a loop of wire onto the winding drum, opposite to the direction of extension of the wire and in a direction parallel to the path of the wire. These catching elements are arranged directly downstream of the spinning bobbin and upstream of other thread treatment or monitoring devices on the thread path.

It has now been determined that during the wire capture process, wire loops may also be formed, which are captured by the wire capture device and wound onto the take-up drum after being transferred to the splicing apparatus. In other words, during the thread catching process, a plurality of threads may be caught by the winding drum and twisted together in the air flow, so that thread loops are formed which are not detected by the clearer and are therefore not cleared. Such wire loops also cause considerable quality problems during subsequent processing.

Disclosure of Invention

The problem to be solved by the invention is to provide a method and a device for detecting a wire loop at a workstation of a textile machine producing a winding reel, by means of which the wire loop generated by a wire capture process can be reliably prevented from being wound onto the winding reel after a wire connection process.

To this end, the invention proposes, according to a first aspect, a method for detecting a wire loop at a workstation of a textile machine producing winding drums, and, according to a second aspect, a device for detecting a wire loop in a workstation of a textile machine producing winding drums.

In the method according to the invention for detecting a thread loop at a workstation of a textile machine producing a winding reel, which workstation has a thread tension sensor, a portion of the thread received by the winding reel is transferred into the detection range of the thread tension sensor after a thread cut or a thread break, the thread is wound onto the winding reel with a controlled thread tension after the completion of the thread splicing process after the thread transfer. The method is characterized in that a thread tension profile is generated from the detection signal of the thread tension sensor with a comparison section having at least one course detectable by the thread tension sensor, the at least one course being selected at least from the courses progressing within the range from the course of the thread transfer up to the course of the closed-loop control of the thread tension during winding. The comparison portion of the generated line tension profile is then compared with a corresponding comparison portion of the line tension profile, which is readably stored in a memory, defined as a wireless loop, in order to assess the presence of the wire loop. This makes it possible to reliably prevent the winding of the wire loop after a cut or break as described above in the manner of an embodiment. The wire loop may be formed by an adjacent arrangement of at least two wire portions belonging to the wire, which are connected to each other by a curved wire portion. For example, at least one line portion may extend adjacent and approximately parallel to at least one other line portion, or may partially surround or wrap the other line portion.

In the sense of the present invention, a line tension profile is a line tension curve recorded over time. The comparison portion is a defined segment of the line tension curve. The comparison portion defined as being free of a loop of wire corresponds to a segment of the wire tension curve or wire tension profile that can be assumed to be the wire tension of the wire in which no loop of wire is formed. It was surprisingly found that, in comparable winding processes, the loop-free portion of the thread tension profile has a substantially identical profile curve, the loop-containing portion of the thread tension profile deviating in an evaluable manner from the profile curve of the above-mentioned loop-free portion.

In an advantageous manner, the stored line tension profile is generated from a plurality of similar line tension profiles each having a comparison portion defined as a radio loop. By means of the generated line tension profile, the tolerance-relevant curve range can be compared without specifying limit values with the currently generated line tension profile or the respective comparison section of the currently generated line tension profile and then evaluated.

More preferably, the stored line tension profile is averaged from a plurality of similar line tension profiles each having a comparison portion defined as a wireless loop. Thus, the stored line tension profile represents an average profile. It is particularly advantageous to take account of the adjustable deviations with different tolerance values with respect to the mean profile by means of particularly preferred input limit values, which define an upper and a lower limit for the mean profile, in which case no wire loop is present or does not exist and which are evaluated accordingly.

Alternatively, it may be preferred to store in the memory a standardized line tension profile with a comparison portion defined as being free of a wire loop, the profile being generated based on knowledge of a plurality of respective line tension profiles each having a comparison portion defined as being free of a wire loop, for example.

According to a preferred embodiment, the stored line tension profile is replaced with the latest line tension profile generated on the basis of the detection signal of the line tension sensor and having a comparison section evaluated without a wire loop. This makes it possible to take into account the variations of the machine over the entire service life. As described above by way of example, the generated, up-to-date line tension profile may be formed, for example, from a plurality of generated similar line tension profiles each having a comparison portion defined as a wireless loop.

More preferably, said comparison portion comprises at least said process detectable by said wire tension sensor during said wire transfer until winding is started, said process occurring in said process sequence downstream of said wiring process and upstream of said process wherein said closed-loop control of the wire tension to a predetermined value or range of values. In the absence of a wire loop, the process sequence exhibits a unique wire tension curve, which makes it possible to evaluate the presence or absence of a wire loop in a more reliable manner by comparison.

According to a preferred embodiment, if said evaluation reveals the presence of a wire loop in the course of said comparison, a troubleshooting is performed which is adapted to remove said wire loop. More preferably, the troubleshooting may be performed by stopping the workstation with a malfunction notification to the operator. Normal visual and/or audible indicators attached to the workstation or textile machine can be used to give a malfunction notification. Alternatively or additionally, the operator may have an electronic communication device (e.g., a smart watch, a smartphone, a notebook, VR glasses, an earpiece, or the like) via which the malfunction notification can also be sent visually or audibly. Upon receipt of such a malfunction notification, the operator may perform manual troubleshooting. The failure notification may include information content based on requirements (e.g., information about the workstation, the type of failure by indicating the presence of a wire loop, etc.) to provide the operator with information relating to troubleshooting with sufficient reliability.

Alternatively or in addition to the transmitted malfunction notification, according to a preferred embodiment, automatic troubleshooting can be performed by initiating a defined troubleshooting cycle (e.g., initiating a cut and a new wiring process or the like).

According to a second aspect of the invention, a device for detecting a wire loop in a workstation of a textile machine producing winding cylinders is proposed. The device is characterized in that the device is configured to compare a line tension profile generated from the detection signal of the line tension sensor assigned to the workstation and having a comparison portion (having at least one process detectable by the line tension sensor) with a corresponding comparison portion of the line tension profile stored readable by the device in memory, defined as a loop of wire, in order to evaluate the presence of a loop of wire. The at least one process detectable by the thread tension sensor is at least selected from the processes progressing within the range from a process for transferring a portion of the thread contained by the winding drum assigned to the station after a thread cut or break to a thread transfer within the detection range of the thread tension sensor up to a process for closed-loop control of the thread tension during winding. For example, the process sequence in the automatic winder described at the beginning may preferably comprise a continuous process which can be detected by a thread tension sensor, the continuous process comprising thread transfer, thread pinching by means of a clamping tube in the direction of the tension sensor, thread clamping, releasing of the thread clamp, winding recovery after completion of the wiring and closed-loop control of the thread tension to a defined value or range of values. Other processes that may be detected by the line tension sensor and that may occur in the process sequence between the preceding processes may also be used to generate the comparison portion or line tension profile. The same advantages as described above can be achieved with this arrangement.

According to a preferred embodiment, the device is a component of a central controller of the textile machine, a controller of the workstations or a component of a workstation computer of the workstations or a component connectable to an external controller of the textile machine or the workstations (for example a superordinate controller of a plurality of textile machines). Alternatively or additionally, the device may preferably be a component of a portable controller that may be communicatively coupled to a superior controller, a central controller, or a station controller. The coupling may be wired or wireless in the usual manner. Thus, the device can be implemented on or coupled to an existing system as desired, in particular retroactively.

The apparatus preferably includes a memory having a readable stored line tension profile. This allows for a more compact design of the device.

Furthermore, the device is preferably designed to generate a line tension profile with a comparison section from the detection signal of the line tension sensor.

Furthermore, when the evaluation reveals the presence of a wire loop, the device is preferably configured to intervene in a controlled manner in the operating sequence of the workstation to remove the wire loop, by stopping the workstation with a malfunction notification for the operator or by starting a defined troubleshooting cycle.

The advantages described for the respective preferred embodiments of the method can also be achieved by means of the above-described preferred embodiments of the device.

According to another aspect of the invention, a station of a textile machine for producing bobbins is proposed, comprising: a thread feeding device for feeding a thread; a winding device for winding the fed wire onto a winding drum; the wiring equipment is used for wiring after cutting or breaking; a wire tension sensor arranged between the wiring device and the winding device; a wire capturing device for performing a process of capturing a wire end extending onto the winding drum after the cutting or breaking of the wire, and performing a process of transferring the captured wire end to the wiring device, wherein a part of the wire enters a detection range of the wire tension sensor. The proposed station is characterized in that it can be connected to or have a device according to one of the above described embodiments for carrying out the method according to one of the above described preferred embodiments.

According to another aspect of the invention, a computer program product is proposed for a programmable device, in particular for a controller of a textile machine, a controller of a workstation, a superordinate controller of a plurality of textile machines or an external controller which can be coupled to the textile machine or to the workstation, comprising readable sequences of instructions for implementing each step of the method according to one of the above embodiments when loaded onto and executed by the programmable device. Such a computer program product may preferably be any physical medium into which computer usable program code may be integrated.

Furthermore, the invention proposes a machine-readable storage medium storing instructions of a computer program for implementing each step of the method according to one of the above embodiments. The machine-readable storage medium may preferably be a material carrier medium such as a floppy disk, a CD or DVD, a hard disk, a tape device, a solid state memory, or the like. Alternatively, the machine-readable storage medium may be a transitory carrier medium, containing in particular an electrical, electronic, optical, acoustic, magnetic or combined signal such as an electromagnetic signal (especially in the form of a microwave or HF signal).

The invention is applicable to all textile machines producing bobbins with stations having thread tension sensors and thread catching devices for transferring thread ends to a piecing apparatus. Such a textile machine may be, for example, an automatic winder with a pivotable device for transferring the thread ends to the wiring device, or with a closed thread path, in which the thread ends are captured by a fixed suction nozzle and transferred to the wiring device within the closed thread path connected to the suction nozzle. Furthermore, the invention can be used in particular in OE spinning machines.

Other features and advantages of the invention will become apparent from the following description of preferred embodiments of the invention, from the accompanying drawings, which show the essential details of the invention, and from the patent claims. In a preferred embodiment of the invention, the individual features can be implemented individually or in any desired combination.

Drawings

Preferred embodiments of the present invention are explained in more detail below based on the drawings.

In the figure:

FIG. 1 is a schematic side view of a workstation of a textile machine producing bobbins at which a method and apparatus according to embodiments of the present invention may be used;

FIG. 2 is a schematic front view of the station shown in FIG. 1;

FIG. 3 shows a schematic view of a wire tension profile of a wire without a wire loop;

FIG. 4 shows a schematic view of a wire tension profile of a wire having a wire loop;

FIG. 5 shows another schematic view of a wire tension profile of a wire having a wire loop;

FIG. 6 shows an exemplary method sequence for a wire loop in accordance with a preferred embodiment; and

fig. 7 shows an exemplary method sequence for detecting a wire loop according to a preferred embodiment.

List of reference numerals

1 textile machine

2 station

3 spinning bobbin

4 winding device

5 winding reel

6 bobbin and tube transfer system

7 Cross-wound bobbin transfer apparatus

8 bobbin bracket

9 roller

10-wire repositioning device

11 transfer plate

12 pivot axis

13 finger wire guide

14 electric drive

15. 18, 19 control cable

16 lines

20 line tension sensor

21. 29, 30 signal cable

22 yarn cleaner

23 tangent line equipment

24 bobbin supply line

25 storage pipeline

26 cross-transfer pipeline

27 pipe return line

28 station computer

31 surface of bobbin

32A, 32B bobbin side

34 Single driver

35 suction nozzle

36 line splicing equipment

37 grip tube

Line tension profile of 50 line without loop

51 comparison of line tension profiles for loop without wire

60. 70 line tension profile of a line with a loop

61. 71 comparison of line tension profiles with wire loops

100 wire loop

110 line transfer process

120 further wire transfer process

130 clamping process

140 cutting and opening process

150 wire connection process

160 step of releasing the clamps

170 recovery procedure

180 line tension closed loop control process

200 method

210 generating a line tension profile

220 comparing step

230 troubleshooting step

A corresponds to a first measurement signal of the line transfer process

B corresponds to a second measurement signal of a further line transfer process

C corresponds to a third measurement signal of the clamping process

D corresponds to a fourth measurement signal of the clamp release process

E corresponds to the fifth measurement signal of the recovery procedure

F sixth measurement signal corresponding to a closed-loop control process of the line tension

Detailed Description

Fig. 1 is a schematic side view of a station 2 of a textile machine 1, which textile machine 1 produces bobbins, in the present case the textile machine 1 being referred to as an automatic winder. Station 2, also called a winding unit, has all the equipment necessary to carry out the method according to an embodiment of the invention. As is known and therefore not explained in detail, the spinning bobbin 3 produced on a ring spinning machine with relatively little yarn material is rewound into a voluminous winding reel 5 at such a station 2, and once completed, the winding reel 5 is transferred by means of a maintenance unit (not shown) to a cross-wound bobbin transfer device 7 extending along the length of the machine and to a bobbin loading station or the like arranged at the end of the machine. In order to supply a new spinning bobbin 3 to a station 2 or to remove an empty bobbin unwound from a station 2, such automatic winding machines 1 usually also have a logistics device in the form of a bobbin and tube transport system 6, in which the spinning bobbin 3 or the empty bobbin is circulated on a transport plate 11.

In this bobbin and tube transport system 6, only the bobbin supply line 24, the reversibly drivable storage line 25, one of the cross-transport lines 26 leading to the station 2 and the tube return line 27 are shown in fig. 1. It is known and therefore only indicated that each station 2 also has different equipment which enables such station to operate correctly. One of these devices is, for example, a winding device with the reference number 4, which has a bobbin support 8 mounted movably about a pivot axis 12, which can be raised and lowered in a defined manner by means of a torque transmitter (not shown). In a conventional winding process, as shown in fig. 1 and 2, the surface 31 of the winding drum 5 rests on and frictionally engages the drum drive roller 9. The bobbin drive roller 9 is connected to a single motor drive 34, which motor drive 34 is connected to the station computer 28 via a control cable 19.

A wire repositioning device 10 is provided for traversing the wire 16 running on the winding drum 5 during winding. Such a thread repositioning device 10 is only schematically illustrated in the figures by way of example and is disclosed, for example, by DE 102004052564 a1, the thread repositioning device 10 having a finger-like thread guide 13, which finger-like thread guide 13 traverses the thread 16 between two bobbin sides 32A and 32B of the winding bobbin 5. The finger-like thread guides 13 are acted upon by an electric drive 14. The electric drive 14 is connected to a station computer 28 via signal and

control cables

15, 18.

Each station 2 also has a lower thread sensor, an electronic clearer 22, a thread cutting device 23 and a thread tension sensor 20, which are also connected to the station computer 28 via control and signal cables, 29, 30 or 21.

Furthermore, each station 2 has: a suction mouth 35, which can be subjected to vacuum, pivotably mounted and configured as a thread catching device for handling so-called uplinks; a gripper tube 37, which may also be subjected to vacuum and pivotally mounted to handle the line; and a pneumatic wire splicing device 36 designed as a wiring device for joining the wire end of the upper wire and the wire end of the lower wire.

During normal winding operation of the bobbin tube 3 arranged on the transfer plate 11 and in the unwinding position in the region of one of the crossed conveying lines 6, the thread 16 is unwound and wound on the winding reel 5. During the winding process, the winding reel 5 is held rotatably between the bearing arms of the reel support 8, and the surface 31 of the winding reel 5 rests on the roller 9 which acts as a reel drive roller in the case of indirect drive and the roller 9 which is designed as a support roller in the case of direct drive.

During winding, the thread 16 extending from the bobbin 3 passes through a lower thread sensor, a thread tensioner (not shown), a thread cutting device 23, a clearer 22 and a thread tension sensor 20 on its way to the winding drum 5. The clearer 22 monitors the extended thread 16 for thread defects. This means that the extended thread 16 generates, in particular in the clearer 22, a dynamic thread path signal which is transmitted via a signal cable 29 to the station computer 28.

Shortly before thread 16 extends onto rotating winding drum 5 and is traversed between package sides 32A and 32B of winding drum 5 by thread repositioning device 10, thread 16 also passes through thread tension sensor 20. As explained above, the line tension sensor 20 is connected to a station computer 28 belonging to the station, which line tension sensor 20 detects the effective line tension change on the extended line 16 and sends the change as a usable measurement signal (defined as detection signal) to the station computer 28. The wire tensioner sets the wire tension based on the measurement signal. The open loop control of the line tension does not require any line tension sensor. For example, a constant control signal may be assigned to the line tensioner. However, a closed loop control line of line tension requires a line tension sensor that measures a quantity representative of the line tension. The operator may specify whether the line tension should be controlled in a closed loop and/or open loop manner. It is convenient to specify such settings for each batch. The batches are formed by stations where the same yarn is wound onto bobbins having the same characteristics. In principle, the operator can specify open loop control even if there is an on-line tension sensor. In this case, the line tension sensor is disabled, or at least the control unit disregards the measured values.

During the winding process, a thread may be cut or broken due to the detection of a thread defect. In this case, the thread end from the winding tube 5 must be engaged with the thread end from the spinning bobbin 3. For this purpose, the wire ends are captured by a suction nozzle 35 or a clamping tube 37 and fed to a wire splicing device 36 and then connected to each other. During this process, wire loops may form, in particular in the region of the suction mouth 35.

The line tension sensor 20 is activated in this so-called wiring cycle 100. Fig. 3 to 5 each show, by way of example only, a

line tension profile

50, 60, 70 resulting from a wiring cycle 100. Fig. 3 shows the line tension profile 50 of a line without a formed loop, and fig. 4 and 5 show the line tension profiles 60, 70 of a line with a formed loop, respectively. Here, fig. 4 corresponds, by way of example only, to the wire tension profile 60 of a wire with a loose wire loop. On the other hand, fig. 5 corresponds, by way of example only, to the wire tension profile of a wire having a wire loop wound around its interior. In this context, fig. 6 schematically shows a method sequence of the wiring cycle 100 according to a preferred embodiment, and fig. 7 schematically shows a method sequence of the method 200 for detecting a wire loop according to a preferred embodiment. The procedures described below in the course of the wiring loop 100 may preferably define the method steps of the method 200 individually, in any combination or in their entirety.

During the course of the wiring cycle 100, the threaded portion coming from the winding reel 5 and carried along by the suction nozzle 35 reaches the detection range of the thread tension sensor 20 via the thread transfer process 110, whereby a first meaningful measurement signal a is generated and sent to the station computer 28.

Due to the different line characteristics caused by the wire loops, the first measurement signal a has a more meaningful deflection profile or a larger characteristic peak profile for lines without wire loops than for lines with wire loops. For example, when the wire is subjected to tensile stress, the wire loop may relax to some extent, which may have a different effect on deflection or peaks than a wire without a wire loop (fig. 4). Alternatively, the wire loop may be wound inside it, as a result of which an increase in the wire tension can also be detected, but without the characteristic peak profile (fig. 5).

In a further course of the wiring cycle 100, the transferred upper thread is picked up by the gripper tube 37 via a further thread transfer process 120 of the lower thread and is carried in a defined manner in the direction of the thread tension sensor 20. This results in a second meaningful measurement signal B from the wire tension sensor 20, which has a greater intensity than the measurement signal a in the case of a wire without a wire loop (fig. 3). However, because the wire loop can be slackened, the wire with a slackened wire loop does not trigger any such meaningful measurement signal from the wire tension sensor 20 (fig. 4). In the case of a wire with a wound loop of wire, the magnitude of the detected wire tension is higher than the corresponding magnitude of the wire tension of a wire without a loop of wire (fig. 5).

After the upper and lower wires are inserted, the upper and lower wires are clamped in the course of the clamping process 130 of the wire splicing apparatus 36. In the case of a wire without a wire loop, the wire has a defined wire tension during the clamping process 130. This is represented by the third meaningful measurement signal C in fig. 3. On the other hand, during the clamping process 130, the wire tension of the wire with the loose wire loop remains almost unchanged, so that no meaningful measurement signal of this kind is generated. The magnitude of the wire tension of the wire with the wound loop is higher than the corresponding magnitude of the wire tension of the wire without the loop.

The clamping process 130 results in cutting of the upper and lower wires and small holding of the wire splicing device 36 and opening of the tangent ends in the tube. The wiring is done after the cutting and opening process 140. During the wiring process 150 of the wire ends, the wire ends are screwed together within the splicing prism of the wire splicing device 36 by means of a compressed air supply, thereby forming a wiring.

After the completion of the wiring process 150, a process 160 of releasing the clamp takes place, as a result of which the wire tension of the wire without a wire loop is significantly reduced, which is shown in the fourth meaningful measurement signal D which is smaller in magnitude than the wire tension profile 50 of the corresponding clamping process 130.

Subsequently, the winding process is continued by means of a recovery process 170. The "start" of station 2 by means of a defined increase in winding speed leads to an increase in the line tension, which is represented in fig. 3 to 5 by a fifth meaningful measurement signal E. In the case of a wire with a loose wire loop, a partial opening of the wire loop may occur, which is why the associated fifth measurement signal E in fig. 4 has two consecutive peaks.

After the recovery process 170, a process 180 of closed loop control of the wire tension or wire tension to a predetermined value or value range is performed, which is represented by a sixth meaningful measurement signal F.

According to the method 200 of an embodiment of the invention, the measurement signals a to F are combined to the line tension profiles 50, 60, 70 in the course of the method steps of generating the line tension profile 210. In other words, the line tension profiles 50, 60, 70 are generated from the measurement signals a to F. The range of the preferred coverage measurement signals a to F of each

line tension profile

50, 60, 70 can be used as a comparison section. Alternatively, according to another embodiment of the present invention, the

comparison section

51, 61, 71 may also be formed by only one of the measurement signals a to E or any combination of these measurement signals a to E.

In a subsequent method step 220 of the comparison, the line tension profiles 50, 60, 70 resulting from the measurement signals a to F are compared with line tension profiles readably stored in a memory. The stored line tension profile is, for example, a profile generated from the measurement signals of the lines identified as having no wire loop as shown in fig. 4. Alternatively, a normalized line tension profile, for example with a comparison portion defined as being free of a wire loop, may be stored in memory, the profile being generated based on knowledge of a plurality of corresponding line tension profiles each having a comparison portion defined as being free of a wire loop. Alternatively, the stored line tension profile may also take the average of a plurality of similar line tension profiles each having a comparison portion defined as being free of a wire loop.

The comparison of the respective defined comparison portions makes it possible to evaluate whether the line has a loop. Looking at the line tension profiles 50, 60, 70 of fig. 3-5, a line tension profile similar to the line tension profile 50 of fig. 3 may indicate a line without a loop of wire and be evaluated accordingly. On the other hand, the line tension profiles 60, 70 as shown in fig. 4 and 5 show that in the absence of a similar profile with the measurement signals a to E, in particular in a range of values defined to be similar, the line does have a wire loop, in which case the line is evaluated as having a wire loop in the course of the evaluation.

According to a preferred embodiment, the comparison can be made by the station computer 28, in which case the station computer 28 has or forms the means for detecting wire loops according to an embodiment of the invention. Alternatively or additionally, the comparison can be performed by a controller selected according to requirements, for example a central controller of the textile machine 1, a superordinate controller of a plurality of textile machines or an external controller such as an external computer which can receive the transmitted measurement signals and/or the generated line tension profile. The evaluation may be performed by the same apparatus that performs the comparison or an evaluation device that may be coupled to the apparatus.

After the presence of the wire loop has been evaluated or after the wire loop has been detected, according to a preferred embodiment, a method step 230 suitable for removing the troubleshooting of the wire loop is performed. This troubleshooting can be performed in particular by stopping the workstation 2, with a malfunction notification for the operator. Normal visual and/or audible indicators attached to the workstation 2 or the textile machine 1 can be used to give a malfunction notification. Alternatively or additionally, the operator may have an electronic communication device (e.g., a smart watch, a smartphone, a notebook, VR glasses, an earpiece, or the like) via which the malfunction notification can also be sent visually or audibly. Upon receipt of such a malfunction notification, the operator may perform manual troubleshooting. The failure notification may include information content based on requirements (e.g., information about the workstation 2, the type of failure by indicating the presence of a wire loop, etc.) to provide the operator with information relating to troubleshooting with sufficient reliability.

Alternatively or in addition to the transmitted malfunction notification, according to an embodiment, automatic troubleshooting may be performed by initiating a defined troubleshooting cycle (e.g., initiating a wire cut and a new wiring process or the like).

According to a further embodiment, the method 200 may have method steps for replacing the stored line tension profile with the latest line tension profile 50 generated on the basis of the detection signals a to F of the line tension sensor 20 and having the comparison portion 51 evaluated as being free of a wire loop. The method steps may be performed as desired at defined times. For example, the method steps may be performed after a defined number of detections of wires with and/or without a wire loop, at a specified time or upon activation by an operator or controller, or during each implementation of the method.

According to a further embodiment of the invention (not shown), a computer program product for a programmable device is provided, in particular for a controller of a textile machine 1, a controller of a station 2, a plurality of superordinate controllers of the textile machine 1 or an external controller which can be connected to the textile machine or to the station. The computer program product comprises a readable sequence of instructions for carrying out each step of the method 200 described by one of the preferred embodiments, when loaded onto and executed by a programmable apparatus.

According to another embodiment of the invention (not shown), a machine-readable storage medium is provided, which stores instructions of a computer program for implementing each step of the method 200 according to one of the described embodiments.

By means of the method, the device for detecting wire loops and the correspondingly adapted station, computer program product or machine-readable storage medium described above by way of example, wire loops formed in the course of the wire capture process can be detected and removed, so that winding drums without such wire loops can be reliably produced.

Claims

1. A method (200) for detecting a thread loop at a workstation (2) of a textile machine (1) producing a winding reel (5), the workstation (2) having a thread tension sensor (20), after a thread cut or a thread break, transferring a thread portion of a thread (16) accommodated by the winding reel (5) into a detection range of the thread tension sensor (20), after completion of a thread joining process (150) following a thread transfer process (110), winding the thread (16) onto the winding reel (5) with a controlled thread tension,

it is characterized in that the preparation method is characterized in that,

generating a line tension profile (50; 60; 70) having a comparison portion (51; 61; 71) as a function of a detection signal (A-F) of the line tension sensor (20), the comparison portion (51; 61; 71) having at least one process (110; 120; 130; 160; 170; 180) which can be detected by the line tension sensor (20), the at least one process being selected from at least the following processes: the plurality of processes continues in a range from the wire transfer process (110) up to a closed loop control process (180) of wire tension during winding, and

the comparison section (51; 61; 71) of the generated line tension profile (50; 60; 70) is compared with a corresponding comparison section of the line tension profile stored in a readable manner in a memory, which is defined as a wireless loop, in order to evaluate the presence of a wire loop.

2. The method (200) of claim 1, wherein the stored line tension profile is generated from a plurality of similar line tension profiles each having a comparison portion defined as a wireless loop.

3. The method (200) according to claim 1 or 2, characterized in that the stored line tension profile is replaced by an up-to-date line tension profile (50), which up-to-date line tension profile (50) is generated on the basis of the detection signal of the line tension sensor and has a comparison portion (51) which is evaluated as being free of a wire loop.

4. Method (200) according to claim 1 or 2, characterized in that said comparison portion (51; 61) comprises at least several processes of a line transfer process (110) detected by said line tension sensor (20) up to a recovery process (170), which recovery process (170) is downstream of said wiring process (150) in process sequence and upstream of a closed loop control process (180) of said line tension controlling the line tension to a predetermined value or range of values.

5. The method (200) according to claim 1 or 2, wherein, if the evaluation reveals the presence of a wire loop in the course of the comparison, a troubleshooting is performed which is adapted to remove the wire loop.

6. The method (200) according to claim 5, characterized in that the troubleshooting is performed by stopping the workstation (2) with a malfunction notification for an operator or by starting a defined troubleshooting circuit.

7. The method (200) of claim 2, wherein the stored line tension profile is generated by averaging the plurality of similar line tension profiles.

8. A device for detecting a thread loop in a workstation (2) of a textile machine (1) producing a winding reel,

it is characterized in that the preparation method is characterized in that,

the device is designed to obtain a line tension profile (50; 60; 70) which is generated from a detection signal (A-F) of a line tension sensor (20) assigned to the station (2) and has a comparison section (51; 61; 71), the comparison section (51; 61; 71) having at least one process (110; 120; 130; 160; 170; 180) which can be detected by the line tension sensor (20), the at least one process being selected from at least the following processes: the plurality of processes continues in a range from a thread transfer process (110) for transferring, after cutting or breaking of a thread, the thread portion of the thread (16) accommodated by the winding drum (5) assigned to the station into the detection range of the thread tension sensor (20) up to a closed-loop control process (180) of the thread tension during winding, and compares the thread tension profile with a corresponding comparison portion of the thread tension profile stored in a memory so as to be readable by the device, defined as a wireless loop, in order to evaluate the presence of a thread loop.

9. Device according to claim 8, characterized in that it is a central controller of the textile machine (1), a station computer (28) of the station (2) or a component connectable to an external control mechanism of the textile machine (1) or the station (2), or is formed by at least one of these mechanisms.

10. Device according to claim 8 or 9, characterized in that it comprises the memory with the line tension profile stored in a readable manner.

11. The device according to claim 8 or 9, characterized in that it is configured to generate the line tension profile with the comparison portion as a function of the detection signal (a-F) of the line tension sensor (20).

12. Device according to claim 8 or 9, characterized in that, if the evaluation reveals the presence of a wire loop, the device is configured to remove the wire loop in a controlled manner by stopping the workstation with a malfunction notification for the operator or by intervening in the operating sequence of the workstation (2) by activating a defined troubleshooting circuit.

13. A station (2) of a textile machine (1) producing bobbins, comprising:

a thread feeding device (3) for feeding a thread (16);

-a winding device (4) for winding the fed thread (16) onto a winding reel (5);

a wiring device (36) for establishing a wire connection after a wire is cut or broken;

a wire tension sensor (20) arranged between the wiring device (36) and the winding device (4); and

a thread catching device (35) for performing a process of catching a thread end extending onto the winding reel after the thread is cut or broken and for performing a thread transferring process (110) for transferring the caught thread end to the wiring device (36), wherein a thread portion of the thread (16) comes within a detection range of the thread tension sensor (20),

it is characterized in that the preparation method is characterized in that,

the station (2) can be connected to or have a device according to one of claims 8 to 12 for carrying out the method (200) according to one of claims 1 to 7.

14. A computer program product for a programmable apparatus, wherein the computer program product comprises a readable sequence of instructions for implementing each step of the method (200) according to one of claims 1 to 7 when loaded onto and executed by the programmable apparatus.

15. Computer program product according to claim 14, characterized in that it is used for a controller of a textile machine (1), a controller of a workstation (2), a superordinate controller of a plurality of textile machines (1) or an external controller which can be coupled to the textile machine or the workstation.

16. A machine-readable storage medium storing instructions of a computer program for implementing each step of the method (200) according to one of claims 1 to 7.