Operating method of a winding machine for rewinding the cops of a preceding ring spinning machine

Abstract

A method for operating a winding machine (24) for rewinding a cop (7) of a ring spinning machine (1) is disclosed. The ring spinning machine (1) has a plurality of spindles (24), each of which is arranged on a spindle rail (22) and includes an electric drive (9). Each electric drive (9) has a distributed control module (10) that cooperates with the electric drive (9) and has means (10) for communicating with a higher-level central control unit (12) via a data bus (13, 14). According to the invention, the distributed control modules (10) of the individual spindle drives detect information about the shape or structure of the cop or about the formed yarn. This information is transmitted to the winding machine (8), and the winding machine (24) takes the received information into account when unwinding the cop (7) and producing a cross-wound package (25).

Description

Technical Field

[0001] The present invention relates to an operating method of a winding machine for rewinding cops of a preceding ring spinning machine in the form described in the preamble of the independent claim. The present invention also relates to a correspondingly configured ring spinning machine.

[0002] Prior Art Ring spinning machines with individual spindle drives as an alternative to belt drives have been known for a long time. Correspondingly, there are a number of publications in this field, particularly discussing the drive concept or the mechanical frame of such spindle units, i.e., the mounting in the spindle rail. Swiss Patent Invention No. 698768 discloses such a spinning machine equipped with an individual spindle drive by way of example.

[0003] The drive assembly includes a rotationally acting electric drive motor. This drive motor acts on the yarn, fiber, non-woven fabric or knitted product via a manipulator provided on the end face side of the shaft of the drive motor, for example in the form of a guide roller. Furthermore, typically various different external sensors as well as additional actuator elements are provided. The external sensors serve in particular to detect the position of the yarn, fiber, non-woven fabric or knitted product. The additional actuator elements serve, for example, to apply a preload to or position the yarn, fiber, knitted product or non-woven fabric. The rotationally acting electric drive motor is usually provided with an overall elastic support, whereby on the one hand the drive assembly can be protected against resonance problems and on the other hand sufficient running stability and service life can be ensured even at high rotational speeds.

[0004] A decentralized control module is provided for open-loop or closed-loop control of an electric drive motor. The decentralized control module, which is functionally and usually also spatially part of the drive assembly, further cooperates with external sensors and additional actuator elements. The decentralized control module is connected to a higher-level central control device via suitable communication means. The central control device adjusts, in particular, a plurality of drive assemblies of the textile machine. Basically, the use of such drive assemblies in textile machines has proven effective over the years.

[0005] European Patent Application Publication No. 2999096 discloses a textile machine comprising at least one drive assembly including a rotationally acting electric drive motor, the drive motor comprising a stator having at least one coil, which is in each case partially surrounded by the casing of the drive motor, a rotor rotatably held on the shaft of the drive motor with respect to the stator, and at least one bearing for the shaft, the drive assembly including elastic means for supporting at least individual functional components of the drive motor and a decentralized control module assigned to the drive motor, the decentralized control module cooperating on the one hand with the drive motor and on the other hand with at least one sensor of the drive assembly and having means for communication with a higher-level central control device, at least one bearing provided for supporting the shaft being supported in the casing such that it can flex with respect to the stator via the elastic means, the shaft being held movably relative to the stator together with the rotor, an electric synchronous motor being provided as the drive motor, the position of the shaft relative to the casing being detectable via a first sensor and / or the angle of rotation of the shaft being detectable via a second sensor, relating to a textile machine.

[0006] In such a working unit of a ring spinning machine, a spinning bobbin having a relatively small yarn capacity, which is produced in the working unit, is rewound onto a large-capacity twill-wound package in a subsequent working step in the working unit of the winding machine. Various different methods for changing the winding speed of the winding machine are known.

[0007] In a known device according to Swiss Patent Invention No. 669177, control of the winding speed and thus also control of the yarn withdrawal speed depending on the remaining amount of yarn on the spinning bobbin are also carried out. That is, in this device, at the start of the cop forming process, first, winding is carried out at a relatively high winding speed, but this winding speed is clearly reduced to a non-critical level at the end of the cop forming process. The winding speed corresponds to the number of revolutions of the package to be wound. By this known method, it is indeed possible to achieve a limitation of the yarn tension that continuously increases during the cop forming process without corresponding means and thus clearly a reduction in yarn breakage. However, the reduction in the winding speed during the last third of the cop forming process leads to a relatively low average winding speed, which has an adverse effect on the efficiency of such a winding machine.

[0008] U.S. Patent No. 4,805,846 also discloses an automatic winding machine that can be adapted to the number of revolutions for each winding unit, thereby preventing yarn breakage.

[0009] In this connection, during the winding process, it is also known that the yarn clearer monitors the fluffing of the yarn to be rewound and reduces the winding speed when the fluffing reaches or exceeds a limit value.

[0010] European Patent No. 2388222 discloses a method for manufacturing a spinning bobbin. The yarn package arranged on the bobbin tube of the spinning bobbin has 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 this method. Here, the optimal position and size of the package of the bobbin to be manufactured in the working unit of the ring spinning machine are defined to be detected by evaluating the delivery behavior of this spinning bobbin when at least one spinning bobbin is rewound in the working unit of the winding machine.

[0011] International Publication No. 9215737 discloses a method and an apparatus for controlling network facilities. The above-mentioned patent document relates to the cooperation of a chained process stage, namely a ring spinning machine, in each case an automatic operating device arranged corresponding to this ring spinning machine, and a winding machine chained to the ring spinning machine. The winding machine itself is equipped with a yarn clearer, and the yarn clearer is suitable for detecting the yarn quality.

[0012] However, what is inconvenient in this embodiment is that additional information of the individual spindle drive device of the ring spinning machine is not used in the winding machine. For example, in the winding machine, it is necessary to separately inspect whether there are abnormal parts, and thereby the abnormal parts can be removed. Furthermore, it is inconvenient that for each individual bobbin during the return conveyance, the winding machine has to determine whether this bobbin has been completely unwound or, in some cases, whether residues remain on the bobbin.

[0013] Disclosure of the Invention In that regard, the object of the present invention is to provide an operating method for a winding machine preceded by a ring spinning machine equipped with an individual spindle drive device, which has an improved rewinding behavior of the bobbin.

[0014] A further object of the present invention is to provide a ring spinning machine equipped with an individual spindle drive device, which provides additional information regarding the shape and structure of the cop, the yarn quality, etc. for a subsequent winding machine.

[0015] This object is achieved by a method corresponding to the preamble of the independent method claims, · a decentralized control module of the individual spindle drive device detects information regarding the shape or structure of the cop or information regarding the produced yarn, · this information is transmitted to the winding machine via an interface, and · the winding machine takes into account the information received at the time of unwinding the cop and during the production of the cheese package. This solves the problem.

[0016] The decentralized control module of the individual spindle drive device, as information about each individual cop, · the meter length of the yarn on the cop · the number and position of yarn breaks over the yarn length · the number and position of intermediate stops during cop formation · the shape and structure of the cop · the irregularity in the hairiness of the yarn · the irregularity in the yarn structure can be transmitted to the winding machine via an interface.

[0017] Thereby, advantageously, this information can be directly detected in the individual spindle drive device according to the present invention, which is done more accurately, comprehensively, and in a timely manner than in the examples cited in the prior art.

[0018] Therefore, the winding machine can advantageously · adapt the speed profile (course) of the cop winding to correspond to the information of the individual spindle drive device, and / or · separate abnormal locations, and / or · The yarn tension of the bobbin can be taken into account during rewinding, and / or · The shape of the bobbin can be taken into account during rewinding.

[0019] Thereby, the rewinding operation can be advantageously carried out more effectively.

[0020] The yarn length of the yarn wound on the bobbin can also be transmitted in the same way, whereby the winding machine can determine whether one bobbin has been completely unwound. Therefore, all bobbins that have not been completely unwound can be newly supplied to the winding machine.

[0021] Advantageously, in the communication structure of the ring spinning machine, there may be at least one section module. The section module is assigned to a plurality of distributed control modules, and the section module queries information regarding the shape or structure of the bobbin or information regarding the formed yarn to one of the assigned distributed control modules, transmits the information from the control module to the section module, and evaluates it in the section module. Alternatively, the information can be evaluated by the assigned distributed control module and transmitted from the distributed control module to the section module assigned to the distributed control module.

[0022] As a conveying system from the ring spinning machine to the winding machine, within the framework of the present invention, an automatic or manual conveying system can be used. Therefore, for example, the bobbin can be conveyed from the ring spinning machine to the winding machine by a peg tray or manually by a vehicle.

[0023] The above problem is also solved by the corresponding ring spinning machine. The ring spinning machine · includes means for a distributed control module to detect information regarding the shape or structure of the bobbin or information regarding the formed yarn, · It includes an interface for intensively transmitting the detected information to the take-up machine. It is characterized by this.

[0024] Therefore, advantageously, according to the present invention, these information can be directly detected by an individual spindle drive device, which is performed more accurately, comprehensively and in a timely manner than in the embodiments cited in the prior art. There may be a section module between the distributed control module and the upper central control device, and the section module is assigned to a plurality of distributed control modules and can further transmit the information correspondingly.

[0025] Another advantage of the present invention will be described in the following embodiments.

Brief Description of the Drawings

[0026]

Figure 1

Figure 2

Figure 3

[0027] Only the features important for the present invention are shown. The same features are provided with the same reference signs in various different drawings.

[0028] Method for Implementing the Invention Figure 1 schematically shows a ring spinning machine 1 according to the present invention. This ring spinning machine 1 has a plurality of spinning units 2 arranged side by side. These spinning units 2 are arranged and located between a head 31 and a base 32 in the longitudinal direction x of the ring spinning machine 1. The head 31 and the base 32 of the ring spinning machine 1 may include bearings, drive devices, control devices, etc. necessary for the operation of the spinning machine. For example, as can be further seen in the two spinning units 2 schematically illustrated in Figure 1, each spinning unit 2 is arranged above a drafting device 5 and has a roving bobbin 4 around which a roving 6 is wound. The roving 6 travels from the roving bobbin 4 through a drafting device 5 where the roving is drafted, and thereby can then travel to a yarn forming element. A circulating traveler or ring traveler guides the finished yarn onto a cop 7 fitted over a driven spindle 8.

[0029] Figure 2 schematically shows the communication system of the ring spinning machine 1. The ring spinning machine 1 has an individual spindle drive device 9 for driving the spindle 8. This individual spindle drive device 9 drives the spindle 8. As the individual spindle drive device 9, an electrical drive device, such as an electrical synchronous motor, asynchronous motor, brushless DC motor, etc. or an equivalent motor is used. A distributed control module 10 is assigned to each individual spindle drive device 9.

[0030] The spindle 8, the individual spindle drive device 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 schematically illustrated, and the components located on the spindle rail 22 are correspondingly illustrated within this structural element in Figure 2. The connection part of the electrical drive device 9 has connection cables. These connection cables are bundled on the spindle rail 22 and are connected to a power supply part at one end of the spindle rail. Advantageously, these connection parts are realized by plug connectors in the electrical drive device 9.

[0031] The control module 10 has the task of monitoring the individual spindle drive 9 and executing commands from the upper control device. Within the framework of the present invention, it is possible to group a plurality of decentralized control modules 10 of the individual spindle drive 9. A plurality of decentralized control modules 10, for example 64 control modules 10, communicate with the upper section control module 11. Two of the section control modules 11 are exemplarily shown 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 module 11 processes the information from the control module 10 and further transmits this information. A plurality of section control modules 11 communicate with the upper 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 this machine data. A display 20 is connected to the central control module 12 for this purpose. The machine data may be read by the user via the display 20 at this location. It is also possible to further transmit these data to a mobile application.

[0032] There is a machine data bus 13 between the central control module 12 and the section control module 11, and a section data bus 14 between the section control module 11 and the decentralized control module 10. The section data bus 14 is responsible for the communication between the control module 10 and the section control module 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 are transmitted by the control module 10 to the section control module 11.

[0033] Additionally, and independently of the data buses 13, 14, there is a digital communication network 15. The digital communication network 15 enables communication between the central control module 12 and the decentralized control modules 10. Through the communication network 15, information that is time-critical and important for safety is directly transmitted from the central control module (device) 12 via the section control module 11 (dashed line) to the control module 10. At the same time, all decentralized control modules 10 of the electric drive device 9 may be actuated by the central control module 12 via the digital communication network 15. For example, commands such as start / stop signals or commands for controlling acceleration / braking ramps can be transmitted from the central control module 12 to the decentralized control modules 10 via the digital communication network 15.

[0034] Figure 2 shows another command / notification element 17. Exactly one command / notification element 17 is assigned to each individual spindle drive 9. 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 plurality of control modules 16 are connected to the command / notification element 17 via the section command bus 19 and are superior to this command / notification element 17. The machine command bus 18 serves for communication between the control module 16 and the central control module 12. When the control module 10 detects a deviation from the target value, this information is transmitted via the bus systems 14, 13, 18, 19 to the assigned notification element 17 and is displayed in the notification element 17. Thus, the operator has the possibility of entering a command (e.g., start or stop) into the command element 17 at the ring rail 23, and this command is then returned via the bus systems 14, 13, 18, 19 to the control module 10. Of course, it is also possible for the control module 10 itself to carry out an action, and thus, for example, the spindle can be easily stopped in the event of a thread break.

[0035] From the distributed control module 10 of the individual spindle drive device 9, it is possible to detect thread breakage or a slow spindle (malfunctioning spindle) based on power consumption. Based on the current waveform (Stromform), in the case of a mechanical bearing device, it is possible to detect the rotational speed, traverse rotational speed, traverse state, spindle operating state, bearing state or bearing damage, oil state, etc. When the spindle 8 is equipped with a magnetic bearing, it is additionally possible to detect the weight of the bobbin 7 via the power consumption of the operating magnetic bearing. When there is a thread break and a related change in power consumption, one specific distributed control module 10 can notify this to the section control module 11. However, the section module 11 can also interrogate all the assigned distributed control modules 10 in succession. The information obtained thereby is then evaluated in succession, and the operating state is detected.

[0036] The section module 11 has (computing) means for evaluating the information obtained in order to detect the operating state described above. The computing means includes means for calculating the root mean square value of the power consumption and for converting the current waveform. In order to convert the signal from the time domain to the frequency domain, in particular, Fourier transform, wavelet transform or Hilbert-Huang transform with empirical mode decomposition as the main component is used. Within the framework of Fourier transform, in particular, short-time Fourier transform, Gabor transform, fast Fourier transform or discrete Fourier transform can be used in the form of discrete cosine transform or discrete sine transform. In wavelet transform, in particular, discrete wavelet transform, fast wavelet transform, wavelet packet transform or stationary wavelet transform is used. Similarly, discrete stationary characteristic values of the signal can be used and the conversion of the signal in the frequency domain can be omitted. As characteristic values, in particular, probability variables such as expected value, absolute deviation, variance, skewness, excess or covariance are used. Similarly, the signal can be correlated, in particular, cross-correlated or auto-correlated. Finally, a combination of the converted signal and the stationary characteristic values can be displayed. In particular, within the framework of pattern detection, it is a common intention to compare the actual measurement signal with the reference signal state. The reference signal can be formed from the information of one or more adjacent spindles or can be read from memory. This is done in particular based on information regarding the similarity of the signal in question with respect to specific features formed from the signal and grouped in a feature tool (Merkmalswerkzeug).

[0037] In an alternative embodiment, the control module 10 has the (computing) means described above, whereby the operating state can be evaluated. The control module 10 then transmits the result for further processing to the assigned section module 11. Furthermore, the control module 10 can use the information from the current signal of the electric drive 9 for the closed-loop control of the spindle 8, the rotational speed of the traverser and the closed-loop control of the thread tension.

[0038] Figure 3 schematically shows the ring spinning machine 1 and the winding machine 24. The winding machine 24 forms a machine complex with a connection in the form of a peg tray conveying system 26 and a two-way interface 27 (schematically illustrated). Another suitable automatic or manual conveying system is also possible within the scope of the present invention. Thus, for example, the cops 7 can be manually transported by vehicle from the ring spinning machine 1 to the winding machine 24. The winding machine 24 rewinds the cops 7 conveyed to the winding unit by the conveying system 26 onto the twill wound packages 25. The winding machine 24 is correspondingly controlled by the control device 28.

[0039] The information generated during the formation of the cops 7 from the above-described individual spindle drive devices 9 of the ring spinning machine 1 and transmitted via the two-way interface 27 may include one or more of the following points: · The length of the yarn on the cop in meters · The number and location of yarn breaks over the yarn length · The number and location of intermediate stops (Zwischenstopp) (low yarn tension) This information is ascertained by the decentralized control module 10 of the individual spindle drive device 9, for example, via rotation speed measurement, the number of stops, etc., and transmitted to the central control module 12. · The shape and structure of the cop This information can be ascertained in addition to the above-described information regarding the length in meters, the number and location of yarn breaks, etc., when processing the position of the spinning ring and the relative height with respect to the cop 7. · The irregularity of hairiness · The irregularity in the yarn structure, for example, pearl chains, repetitive patterns during cop formation, etc. · Areas where the core is not cleanly coated during the production of the core yarn can be detected.

[0040] In order to obtain this information from the individual spindle drive 9, in addition to the three pieces of information listed first above, the pattern of power consumption and the resulting torque consumption are taken into account. Subsequently, the bobbin is either directly marked by an identification means, such as an RFID tag, or identified via the peg tray conveyor system 26, so that the winding machine 24 can assign the acquired information to each bobbin 7. Each individual spindle drive 9 obtains the information for each formed bobbin 7 via the control module 10. The evaluation and calculation of the information are performed directly in the decentralized control module 10 or in the section control module 11, depending on the available computing capacity, similar to the information mentioned in connection with FIG. 2. The information is transmitted to the central control module 12 via the section control module 11. The central control module 12 further transmits this information to the winding machine 24 for processing via the aggregated bidirectional interface 27.

[0041] Therefore, the winding machine 24 can be operated more intentionally and effectively by the control device 28 during the rewinding of the bobbin 7.

[0042] The speed profile (course) during the rewinding of the bobbin 7 can be adapted accordingly to the information of the individual spindle drive 9: · The individual shape of the bobbin 7 is transmitted, and the rewinding speed can take into account the shape of the bobbin 7 (for example, slowly for a small bobbin diameter and fast for a large bobbin diameter). This prevents thread breakage in the winding process and thus results in higher efficiency in the winding process. · The individual thread tension course of the bobbin 7 is transmitted, and the rewinding speed can take into account the thread tension on the bobbin 7 (for example, a low thread tension will occur during an intermediate stop). This simultaneously prevents multiple locations of the bobbin 7 from being drawn out, resulting in the rejection of defective bobbins 7.

[0043] In the winding process, in particular, it is possible to determine whether or not the bobbin 7 has been completely unwound. This enables efficient transportation of the bobbin on the peg tray transport system 26 of the winding machine 24 during the return transport to the ring spinning machine 1. Separate control of the bobbin 7 as to whether or not it has been completely unwound is omitted because only the completely unwound bobbin 7 is returned. All bobbins 7 that have not been completely unwound are newly supplied to a separate line of the winding machine 24.

[0044] Since known abnormal locations are transmitted, there is no need to detect them first. This enables holding the yarn piece on the twill-wound package 25 and omitting the yarn search on the twill-wound package 25: ·Individual abnormal locations can be directly separated. This results in higher efficiency in the winding process. ·Adjacent continuous abnormal locations (for example, a pearl chain) can be separated as a whole. This results in higher efficiency in the winding process. ·A core yarn region where the core is not completely cleanly covered or not covered at all can be separated as a whole. This results in higher efficiency in the winding process.

[0045] The yarn can be drawn out from the bobbin in a tangential direction because it is possible to intentionally approach the abnormal location and prevent yarn breakage in the winding process by improved process control. This enables "balloon-free" yarn travel during winding back, and thus eliminates quality defects in the yarn (especially during hairiness).

Explanation of Reference Numerals

[0046] 1 Ring spinning machine 2 Spinning unit 31 Head of the ring spinning machine 1 32 Base of the ring spinning machine 1 4 Roving bobbin 5 Drafting device 6 Roving 7 Cup 8 Spindle 9 Individual Spindle Drive Device for Spindle 8 10 Distributed Control Module of Individual Spindle Drive Device 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 / Notification Element 17 17 Command / Notification Element, Operation Unit 18 Machine Command Bus 19 Section Command Bus 20 Display 22 Spindle Rail 23 Ring Rail 24 Take-up Machine 25 Twill-wound Package 26 Peg Tray Conveyor System 27 Bidirectional Interface 28 Control Device for Take-up Machine 8 x Longitudinal Direction

Claims

1. A method of operating a take-up machine (24) for rewinding a cop (7) of a preceding ring spinning machine (1), wherein the ring spinning machine (1) has a plurality of spindles (8), the spindles (8) being arranged on a spindle rail (22) and each including an electric drive device (9), each electric drive device (9) having a distributed control module (10), the distributed control module (10) cooperating with the electric drive device (9), the distributed control module (10) having means (10) for communicating with a higher-level central control device (12) via data buses (13, 14), the method comprising conveying the cop (7) from the ring spinning machine (1) to the take-up machine (24) by a conveying system (26), - the distributed control module (10) of the electric drive device (9) detecting information regarding the shape or structure of the cop (7) or information regarding the formed yarn, - transmitting the information to the take-up machine (24) via an interface (27), and - the take-up machine (24) adapting the rewinding speed profile of the cop (7) to correspond to the information of the electric drive device (9), and - the take-up machine (24) receiving information regarding an abnormal location from the information and disconnecting the abnormal location, and / or - the take-up machine (24) changing the rewinding speed so as to be slow at a small cop diameter of the cop (7) and fast at a large cop diameter according to the individual shape of the transmitted cop (7). A method characterized by the above.

2. The distributed control module (10) of the electric drive device (9), as information of each individual cop (7), - the meter length of the yarn on the cop (7) - the number and position of yarn breaks over the yarn length - the number and position of intermediate stops during cop formation - the shape and structure of the cop (7) - the irregularity in the hairiness of the yarn - the irregularity in the yarn structure is transmitted to the take-up machine (24) via the interface (27). The method of operating the take-up machine (24) according to Claim 1.

3. There is at least one section control module (11), and the section control module (11) is assigned to a plurality of distributed control modules (10). The section control module (11) queries the information regarding the shape or structure of the cop (7) or the information regarding the formed yarn from one of the assigned distributed control modules (10), transmits the information from the distributed control module (10) to the section control module (11), and evaluates it in the section control module (11). The operation method of the winding machine (24) according to claim 1 or 2.

4. There is at least one section control module (11), and the section control module (11) is assigned to a plurality of distributed control modules (10). The information regarding the shape or structure of the cop (7) or the information regarding the formed yarn is evaluated by one of the assigned distributed control modules (10), and is transmitted from the distributed control module (10) to the section control module (11) assigned to the distributed control module (10). The operation method of the winding machine (24) according to claim 1 or 2.

5. Transmitting the yarn length of the cop (7) to determine whether one cop (7) has been completely unwound. The operation method of the winding machine (24) according to claim 2.

6. Conveying the cop (7) from the ring spinning machine (1) to the winding machine (24) by an automatic or manual conveying system (26). The operation method of the winding machine (24) according to any one of claims 1 to 5.

7. Supplying all the cops that have not been completely unwound to the winding machine (24) newly. The operation method of the winding machine (24) according to any one of claims 1 to 6.

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