JP7702783B2 - Method of operating a winding machine for rewinding the cups of a prior ring spinning machine - Google Patents

Description

The present invention relates to a method for operating a winding machine for rewinding a cop of a ring spinning machine of the type described in the preamble of the independent claim. The present invention also relates to a correspondingly configured ring spinning machine.

PRIOR ART Ring spinning machines with individual spindle drives as an alternative to belt drives have been known for some time. Correspondingly, there are numerous publications in this field which in particular discuss the drive concept of such spindle units or their mounting in the machine frame, i.e. in the spindle rail. Swiss Patent No. 698768 discloses, by way of example, such a spinning machine with individual spindle drives.

The drive assembly includes an electric drive motor that acts in a rotary manner. This drive motor acts on the threads, fibers, nonwovens or knitted products via a manipulator, for example in the form of a guide roller, which is provided on the end face of the shaft of the drive motor. In addition, different external sensors and additional actuator elements are typically provided. The external sensors serve in particular to detect the position of the threads, fibers, nonwovens or knitted products. The additional actuator elements serve, for example, to preload or position the threads, fibers, knitted products or nonwovens. The electric drive motor that acts in a rotary manner is usually provided on a fully elastic support, which on the one hand protects the drive assembly against resonance problems and on the other hand ensures sufficient running stability and service life even at high rotational speeds.

A distributed control module is provided for open-loop or closed-loop control of the electric drive motor. The distributed control module, which is functionally and usually also spatially arranged as part of the drive assembly, further cooperates with external sensors and additional actuator elements. The distributed control module is connected via suitable communication means to a higher-level central control device. The central control device coordinates, inter alia, the multiple drive assemblies of the textile machine. In principle, the use of such drive assemblies in textile machines has proven effective for many years.

EP 2 999 096 A1 describes a textile machine, which comprises at least one drive assembly including an electric drive motor acting in a rotary manner, which drive motor comprises a stator having at least one coil, in each case partially surrounded by a casing of the drive motor, a rotor held on the shaft of the drive motor rotatably with respect to the stator, and at least one bearing for the shaft, the drive assembly comprising elastic means for supporting at least individual functional components of the drive motor and a distributed control module assigned to the drive motor, the distributed control module being adapted to control the drive motor and the drive assembly being adapted to control the drive motor and the drive motor. The present invention relates to a textile machine in which a rotor cooperates with the drive motor on the one hand and with at least one sensor of the drive assembly on the other hand and has means for communication with a higher-level central control device, at least one bearing provided for supporting a shaft is supported in the casing so that it can be deflected with respect to the stator via elastic means, the shaft together with the rotor is held movably relative to the stator, an electric synchronous motor is provided as the drive motor, and the position of the shaft relative to the casing can be detected via a first sensor and/or the rotation angle of the shaft can be detected via a second sensor.

The spinning cops with a relatively small yarn capacity produced in such a ring spinning machine working unit are rewound into a large-capacity twill package in a subsequent working process in the winding machine working unit. Different methods are known for changing the winding speed of the winding machine.

In the known device according to Swiss Patent No. 669177, the winding speed and therefore also the yarn withdrawal speed are controlled as a function of the amount of yarn remaining on the spinning cop. This means that in this device, at the beginning of the cop formation process, winding is first carried out at a relatively high winding speed, which is then reduced to a significantly non-critical level at the end of the cop formation process. The winding speed corresponds to the winding speed of the package to be wound. Although this known method certainly makes it possible to limit the yarn tension, which without corresponding measures would continually increase during the cop formation process, and thus to a significant reduction in yarn breaks, the reduction in the winding speed during the last third of the cop formation process leads to a relatively small average winding speed, which has a detrimental effect on the efficiency of such a winder.

U.S. Pat. No. 4,805,846 also discloses an automatic winding machine that can adapt the number of revolutions for each winding unit, thereby preventing yarn breakage.

In this connection, it is also known to monitor the hairiness of the yarn to be rewound during the winding process by means of a yarn clearer and to reduce the winding speed if the hairiness reaches or exceeds a limit value.

EP 2 388 222 discloses a method for producing spinning cops. The yarn windings of the spinning cops arranged on the coils of the coils have a yarn length and a winding size defined by the spinning program of the ring spinning machine. The above mentioned patent specification further discloses a ring spinning machine for carrying out the method. It is provided that the optimum position and size of the coils of the coils to be produced in the working unit of the ring spinning machine is determined by evaluating the unwinding behavior of at least one spinning cop during rewinding of the spinning cop in the working unit of the winding machine.

WO 9215737 discloses a method and a device for controlling a network installation. The document concerns the cooperation of a linked process stage, i.e. a ring spinning machine, an automatic operating device which is in each case assigned to said ring spinning machine, and a winding machine which is linked to said ring spinning machine. The winding machine itself is equipped with a yarn clearer, which is suitable for detecting the yarn quality.

However, a disadvantage of this embodiment is that the additional information of the individual spindle drives of the ring spinning machine is not available to the winding machine, which must check separately for anomalies, for example, so that they can be eliminated. It is also disadvantageous that, during the return transport, it must be determined for each individual cup whether the winding machine has completely unwound this cup or whether, if any, residues remain on the cup.

DISCLOSURE OF THE PRESENTING To that extent, it is an object of the present invention to provide a method for operating a winding machine preceded by a ring spinning machine with separate spindle drives, which method provides an improved rewinding behavior of the cops.

It is a further object of the present invention to provide a ring spinning machine with individual spindle drives, in which additional information is provided for the subsequent winding machine, such as regarding the shape and structure of the cops, as well as the yarn quality, etc.

This problem is solved by a method according to the preamble of an independent method claim:
A distributed control module of the individual spindle drives detects information about the shape or structure of the cup or about the yarn produced,
This is achieved by transmitting this information to the winding machine via an interface, and the information received by the winding machine is taken into account when unwinding the cups and when producing the cross-wound package.

A distributed control module for each individual spindle drive provides information about each individual cup,
- Length in metres of yarn on the cup - Number and location of yarn breaks over the yarn length - Number and location of intermediate stops during cup formation - Shape and structure of the cup - Irregularities in the yarn hairiness - Irregularities in the yarn structure can be communicated to the winding machine via the interface.

Advantageously, this information can thus be detected according to the invention directly at the individual spindle drives, more accurately, comprehensively and timely than in the examples given in the prior art.

The winding machine therefore advantageously comprises:
- the speed profile (progression) of the rewinding of the cop can be adapted in response to information from the individual spindle drives, and/or - abnormalities can be isolated, and/or - the yarn tension in the cop can be taken into account during rewinding, and/or - the shape of the cop can be taken into account during rewinding.

This allows the rewinding process to be advantageously more efficient.

The length of the yarn wound onto the cops can be transmitted as well, allowing the winder to determine whether a cop has been completely unwound or not. Any cops that have not been completely unwound can then be re-fed to the winder.

Advantageously, in the communication structure of the ring spinning machine, there may be at least one section module, which is assigned to a number of distributed control modules, and which queries one of the distributed control modules for information about the shape or structure of the cup or about the formed yarn, which information is transmitted from the control module to the section module and evaluated there. Alternatively, the information can be evaluated by the distributed control module and transmitted from the distributed control module to the section module assigned to the distributed control module.

As a transport system from the ring spinning machine to the winding machine, within the scope of the present invention, an automatic or manual transport system can be used. Thus, for example, the cups can be transported from the ring spinning machine to the winding machine by means of a peg tray or manually by means of a vehicle.

The above object is also achieved by a corresponding ring spinning machine.
the distributed control module includes means for detecting information relating to the shape or structure of the cup or information relating to the formed threads;
The present invention is characterized in that it includes an interface for collectively transmitting the detected information to a winding machine.

Advantageously, this information can therefore be detected according to the invention directly by the individual spindle drives, more accurately, comprehensively and timely than in the examples given in the prior art. Between the distributed control modules and the higher-level central control device, section modules can be present, which are assigned to a number of distributed control modules and can transmit the information accordingly.

Further advantages of the present invention are illustrated in the following examples.

FIG. 1 is a schematic diagram showing a ring spinning machine with individual spindle drives. FIG. 2 is a schematic diagram showing a communication system of a ring spinning machine. FIG. 1 is a schematic diagram showing a ring spinning machine connected to a winding machine.

Only the features that are important to the invention are shown. Identical features are provided with the same reference numbers in the different drawings.

Method for carrying out the invention Figure 1 shows a schematic representation of a ring spinning machine 1 according to the invention. The ring spinning machine 1 has a number of spinning units 2 arranged next to each other. These spinning units 2 are arranged and located in the longitudinal direction x of the ring spinning machine 1 between a head 3 ₁ and a base 3 _2. The head 3 ₁ and the base 3 ₂ of the ring spinning machine 1 may include bearings, drives, controls, etc., which are necessary for the operation of the spinning machine. As can be further seen, for example, in the two spinning units 2 shown diagrammatically in Figure 1, each spinning unit 2 has a roving bobbin 4 arranged above a drafting device 5 and on which a roving 6 is wound. From the roving bobbin 4, the roving 6 runs through the drafting device 5, on which the roving is drafted, and can then run to a yarn-forming element. A recirculating traveller or ring traveller guides the finished yarn onto a cop 7, which is fitted onto a driven spindle 8.

Figure 2 shows a schematic diagram of the communication system of the ring spinning machine 1. The ring spinning machine 1 has individual spindle drives 9 for driving the spindles 8. The individual spindle drives 9 drive the spindles 8. As individual spindle drives 9, electric drives are used, for example electric synchronous motors, asynchronous motors, brushless DC motors, etc. or equivalent motors. Each individual spindle drive 9 is assigned a distributed control module 10.

The spindle 8, the individual spindle drives 9 and the control module 10 are arranged on a spindle rail 22 of the ring spinning machine 1. The spindle rail 22 is only shown diagrammatically, and the components located on the spindle rail 22 are correspondingly shown in this component in FIG. 2. The connections of the electric drive 9 have connecting cables. These connecting cables are gathered on the spindle rail 22 and connected to a power supply at one end of the spindle rail. Advantageously, these connections are realized by plug connectors in the electric drive 9.

The control module 10 has the task of monitoring the individual spindle drives 9 and executing commands from a higher-level control device. Within the scope of the present invention, it is possible for several distributed control modules 10 of the individual spindle drives 9 to be grouped together. Several distributed control modules 10, for example 64 control modules 10, communicate with a higher-level section control module 11. Two of the section control modules 11 are shown by way of example in FIG. 2. However, the number of section control modules 11 depends on the number of spindles 8, as suggested by the dashed control modules 10. The section control modules 11 process information from the control modules 10 and transmit this information further. Several section control modules 11 communicate with a higher-level central control module 12 of the ring spinning machine 1. The central control module 12 is a central machine control device that has all the machine data and statistically processes and visualizes the machine data. For this purpose, a display 20 is connected to the central control module 12. The machine data can be read out by the user at this point via the display 20. This data can also be further transmitted to mobile applications.

Between the central control module 12 and the section control modules 11, there is a machine data bus 13, and between the section control modules 11 and the distributed control modules 10, there is a section data bus 14. The section data bus 14 is responsible for communication between the control modules 10 and the section control modules 11. Via the section data bus 14, commands from the section module 11 are transmitted to the control module 10, and the operating state or measurement data of the electric drive 9 of the spindle 8 is transmitted by the control module 10 to the section control module 11.

Additionally, and independently of the data buses 13, 14, there is a digital communication network 15. The digital communication network 15 allows the central control module 12 and the distributed control modules 10 to communicate with each other. Time-critical and safety-critical information is transmitted via the communication network 15 directly from the central control module 12 to the section control modules 11 (dashed lines) via the central control module 12 via the communication network 15 to the control modules 10. At the same time, all distributed control modules 10 of the electric drive 9 can be operated by the central control module 12 via the digital communication network 15, and commands for controlling, for example, start/stop signals or acceleration/braking ramps (gradients) can be sent from the central control module 12 to the distributed control modules 10.

2 shows another command/notification element 17. Each individual spindle drive 9 is assigned exactly one command/notification element 17. This command/notification element is arranged on the ring rail 23 of the ring spinning machine 1 in the form of an operating element 17. A number of control modules 16 are connected to the command/notification element 17 via a section command bus 19 and place this command/notification element 17 above. A machine command bus 18 serves for communication between the control modules 16 and the central control module 12. If the control module 10 determines a deviation from the setpoint, this information is transmitted via the bus systems 14, 13, 18, 19 to the assigned notification element 17 and displayed in the notification element 17. Thus, the operator has the possibility to enter a command (e.g. start or stop) into the command element 17 on the ring rail 23, which is then transmitted back to the control module 10 via the bus systems 14, 13, 18, 19. Of course, the control module 10 itself can also carry out an action, so that, for example, the spindle can simply be stopped in the event of a thread break.

From the distributed control modules 10 of the individual spindle drives 9, a yarn break or a slow spindle can be detected based on the power consumption. Based on the current waveform, in the case of mechanical bearings, the rotational speed, the traveler speed, the state of the traveler, the operating state of the spindle, the bearing state or bearing damage, the oil state, etc. can be detected. If the spindle 8 is equipped with a magnetic bearing, the weight of the cup 7 can be detected via the power consumption of the additionally active magnetic bearing. In the event of a yarn break and a related change in the power consumption, one specific distributed control module 10 can report this to the section control module 11. However, the section module 11 can also query all the assigned distributed control modules 10 in succession. The information obtained in this way is then evaluated in succession to determine the operating state.

The section module 11 has (calculation) means for evaluating the obtained information in order to detect the above-mentioned operating states. The calculation means include means for calculating the mean square value of the power consumption and for transforming the current waveform. To transform the signal from the time domain to the frequency domain, in particular the Fourier transform, the wavelet transform or the Hilbert-Huang transform with empirical mode decomposition as the principal component are used. Within the framework of the Fourier transform, in particular the short-time Fourier transform, the Gabor transform, the fast Fourier transform or the discrete Fourier transform can be used in the form as the discrete cosine transform or the discrete sine transform. In the wavelet transform, in particular the discrete wavelet transform, the fast wavelet transform, the wavelet packet transform or the static wavelet transform are used. Likewise, discrete static characteristic values of the signal can be used and the transformation of the signal in the frequency domain can be omitted. As characteristic values, in particular random variables such as the expectation, absolute deviation, variance, slope (Schiefe), excess or covariance are used. Similarly, the signals can be correlated, in particular cross-correlated or autocorrelated. Finally, a combination of the transformed signal and the static characteristic values can be displayed. It is a common idea, especially within the context of pattern detection, to compare the actual measurement signal with a reference signal state. The reference signal can be formed from information on one or more adjacent spindles or can be read out from a memory. This is done, in particular, on the basis of information on the similarity of the signal in question for certain features that are formed from the signal and summarized in a feature tool.

In an alternative embodiment, the control module 10 has the above-mentioned (calculating) means, by means of which the operating state can be evaluated. The control module 10 then transmits the results to the assigned section module 11 for further processing. Furthermore, the control module 10 can use information from the current signal of the electric drive 9 for closed-loop control of the rotational speed of the spindle 8, the traveler and for closed-loop control of the yarn tension.

Figure 3 shows the ring spinning machine 1 and the winding machine 24 diagrammatically. The winding machine 24 forms a machine complex with a connection in the form of a peg tray transport system 26 and a two-way interface 27 (shown diagrammatically). Other suitable automatic or manual transport systems are also possible within the scope of the invention. Thus, for example, the cups 7 can be transported manually by a vehicle from the ring spinning machine 1 to the winding machine 24. The winding machine 24 rewinds the cups 7 transported by the transport system 26 to the winding unit into a traverse package 25. The winding machine 24 is correspondingly controlled by a control device 28.

The information generated during the formation of the cop 7 from the above-mentioned individual spindle drives 9 of the ring spinning machine 1 and transmitted via the bidirectional interface 27 may include one or more of the following:
- Length of the yarn on the cop in metres - Number and position of yarn breaks over the length of the yarn - Number and position of intermediate stops (Zwischenstopp) (low yarn tension)
This information is determined by the decentralized control modules 10 of the individual spindle drives 9 , for example via rotational speed measurements, number of stops, etc., and transmitted to a central control module 12 .
- Shape and structure of the cup. This information can be ascertained when processing the position of the spinning ring and its height relative to the cup 7 in addition to the above-mentioned information on the length in metres, the number and location of yarn breaks etc.
Irregularities in hairiness Irregularities in yarn structure e.g. pearl chains, repetitive patterns during cup formation etc. During production of core yarns, areas where the core is not nicely coated can be located.

To obtain this information from the individual spindle drives 9, in addition to the first three pieces of information mentioned above, the pattern of power consumption and the resulting torque consumption are taken into account. The cups are then marked directly by identification means, for example an RFID tag, or are identified via the peg tray transport system 26, so that the winder 24 can assign the acquired information to the respective cup 7. Each individual spindle drive 9 obtains the information for each formed cup 7 via the control module 10. The evaluation and calculation of the information, as with the information listed in connection with FIG. 2, takes place directly in the distributed control module 10 or in the section control module 11, depending on the available calculation capacity. The information is transmitted via the section control module 11 to the central control module 12, which then transmits this information further via the bidirectional interface 27 in a centralized manner to the winder 24 for processing.

Therefore, the winder 24 can be operated more intentionally and effectively by the control device 28 when rewinding the cup 7.

The speed profile during rewinding of the cup 7 can be adapted correspondingly to the information of the individual spindle drives 9:
The individual shape of the cup 7 is transmitted and the rewinding speed can take into account the shape of the cup 7 (e.g. slower for small cup diameters, faster for large cup diameters), which prevents yarn breaks during the winding process and thus leads to a higher efficiency in the winding process.
The individual thread tension profiles of the cops 7 are transmitted and the rewinding speed can take into account the thread tension on the cops 7 (e.g. at intermediate stops a lower thread tension will occur). This prevents several parts of the cops 7 being pulled out at the same time, which would result in the discarding of defective cops 7.

During the winding process, it is possible in particular to ascertain whether the cops 7 have been completely unwound or not. This allows for an efficient transport of the cops on the peg tray transport system 26 of the winding machine 24 during return transport to the ring spinning machine 1. A separate control of the cops 7 as to whether they have been completely unwound or not is omitted, since only the cops 7 that have been completely unwound are returned. All cops 7 that have not been completely unwound are fed anew to a separate line of the winding machine 24.

Since the known anomaly is transmitted, it is not necessary to detect it first. This allows to hold the yarn piece to the traverse package 25 and to omit the yarn search on the traverse package 25:
Individual anomalies can be directly isolated, which leads to higher efficiency in the winding process.
Closely adjacent continuous anomalies (e.g. pearl chains) can be completely separated, which leads to higher efficiency in the winding process.
Core yarn areas where the core is not completely cleanly coated or not coated at all can be cut off entirely, which leads to higher efficiency in the winding process.

The yarn can be unwound tangentially from the cop, since the anomaly can be accessed in a targeted manner and yarn breaks during the winding process can be prevented by improved process control. This allows for a "balloon-free" yarn run during rewinding and thus eliminates quality defects in the yarn (especially in the case of hairiness).

1 Ring spinning machine ₂ Spinning unit 3 Head of the ring spinning machine 1 ₃ Base of the ring spinning machine 1 4 Roving bobbin 5 Drafting device 6 Roving 7 Cop 8 Spindle 9 Individual spindle drives of the spindles 8 10 Distributed control modules of the individual spindle drives 9 11 Section control module 12 Central control module 13 Machine data bus 14 Section data bus 15 Digital communication network 16 Control module for command/inform element 17 17 Command/inform element, operating unit 18 Machine command bus 19 Section command bus 20 Display 22 Spindle rail 23 Ring rail 24 Winding machine 25 Twill package 26 Peg tray transport system 27 Bidirectional interface 28 Control device of the winding machine 8 x Longitudinal direction

Claims (7)

A method for operating a winding machine (24) for rewinding a cop (7) of a ring spinning machine (1) according to the present invention, the ring spinning machine (1) having a plurality of spindles (8) arranged on a spindle rail (22) and each including an electric drive (9),
Each electric drive (9) has a distributed control module (10) which cooperates with said electric drive (9), said distributed control module (10) having means (10) for communicating with a higher-level central control device (12) via a data bus (13, 14),
The method comprises transporting the cops (7) from the ring spinning machine (1) to the winding machine (24) by a transport system (26),
the distributed control module (10) of the electric drive (9) detects information about the shape or structure of the cup (7) or about the formed thread,
- transmitting said information to the winding machine (24) via an interface (27), and - the winding machine (24) adapts the speed profile of the rewinding of the cop (7) in response to said information of the electric drive (9) , and
the winding machine (24) receives information about the anomaly from the information and separates said anomaly, and/or the winding machine (24) changes the rewinding speed depending on the transmitted individual shape of the cup (7) so that it is slower for small cup diameters of the cup (7) and faster for large cup diameters.
A method comprising: The distributed control module (10) of the electric drive (9) receives, as information for each individual cup (7),
2. The method for operating a winding machine (24) according to claim 1, further comprising transmitting to the winding machine (24) via the interface (27) the following information: - the length in meters of the yarn on the cup (7); - the number and location of yarn breaks over the yarn length; - the number and location of intermediate stops during cup formation; - the shape and structure of the cup (7); - any irregularities in the hairiness of the yarn; and - any irregularities in the yarn structure. A method for operating a winding machine (24) according to claim 1 or 2, in which at least one section control module (11) is present and is assigned to a plurality of distributed control modules (10), and the section control module (11) queries one of the distributed control modules (10) for the information on the shape or structure of the cup (7) or the information on the formed yarn, and transmits the information from the distributed control module (10) to the section control module (11) and evaluates it in the section control module (11). A method for operating a winding machine (24) according to claim 1 or 2, in which at least one section control module (11) is present and is assigned to a plurality of distributed control modules (10), and the information on the shape or structure of the cup (7) or the information on the formed yarn is evaluated by one of the distributed control modules (10) assigned to it and transmitted from the distributed control module (10) to the section control module (11) assigned to the distributed control module (10). 3. A method for operating a winding machine (24) according to claim 2 , characterized in that the yarn length of the cops (7) is transmitted to the winding machine (24) to determine whether a cop (7) has been completely unwound. A method for operating a winding machine (24) according to any one of claims 1 to 5, in which the cop (7) is transported from the ring spinning machine (1) to the winding machine (24) by an automatic or manual transport system (26). A method for operating a winding machine (24) according to any one of claims 1 to 6, comprising resupplying all cops that have not been completely unwound to the winding machine (24).

Images