EP4050138B1 - Method of operating a spinning machine work station and work station - Google Patents

Method of operating a spinning machine work station and work station Download PDF

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Publication number
EP4050138B1
EP4050138B1 EP22154801.9A EP22154801A EP4050138B1 EP 4050138 B1 EP4050138 B1 EP 4050138B1 EP 22154801 A EP22154801 A EP 22154801A EP 4050138 B1 EP4050138 B1 EP 4050138B1
Authority
EP
European Patent Office
Prior art keywords
yarn
winding
speed
bobbin
workstation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP22154801.9A
Other languages
German (de)
French (fr)
Other versions
EP4050138A1 (en
Inventor
Pavel Kucera
Jakub MAREK
Jan Pysny
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RIETER AG
Original Assignee
Maschinenfabrik Rieter AG
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Publication of EP4050138A1 publication Critical patent/EP4050138A1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/06Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to presence of irregularities in running material, e.g. for severing the material at irregularities ; Control of the correct working of the yarn cleaner
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H54/00Winding, coiling, or depositing filamentary material
    • B65H54/02Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
    • B65H54/06Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers for making cross-wound packages
    • B65H54/08Precision winding arrangements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H54/00Winding, coiling, or depositing filamentary material
    • B65H54/02Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
    • B65H54/22Automatic winding machines, i.e. machines with servicing units for automatically performing end-finding, interconnecting of successive lengths of material, controlling and fault-detecting of the running material and replacing or removing of full or empty cores
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H54/00Winding, coiling, or depositing filamentary material
    • B65H54/02Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
    • B65H54/28Traversing devices; Package-shaping arrangements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H54/00Winding, coiling, or depositing filamentary material
    • B65H54/70Other constructional features of yarn-winding machines
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/006Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package quality control of the package
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H67/00Replacing or removing cores, receptacles, or completed packages at paying-out, winding, or depositing stations
    • B65H67/08Automatic end-finding and material-interconnecting arrangements
    • B65H67/081Automatic end-finding and material-interconnecting arrangements acting after interruption of the winding process, e.g. yarn breakage, yarn cut or package replacement
    • B65H67/085Automatic end-finding and material-interconnecting arrangements acting after interruption of the winding process, e.g. yarn breakage, yarn cut or package replacement end-finding at the take-up package, e.g. by suction and reverse package rotation
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H1/00Spinning or twisting machines in which the product is wound-up continuously
    • D01H1/14Details
    • D01H1/20Driving or stopping arrangements
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H13/00Other common constructional features, details or accessories
    • D01H13/14Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
    • D01H13/22Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to presence of irregularities in running material
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H4/00Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/42Control of driving or stopping
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H4/00Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/42Control of driving or stopping
    • D01H4/44Control of driving or stopping in rotor spinning
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00Handled material; Storage means
    • B65H2701/30Handled filamentary material
    • B65H2701/31Textiles threads or artificial strands of filaments
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00Application field

Definitions

  • the present invention relates to a method for operating a workstation of a spinning machine, wherein a yarn is drawn off from a spinning unit at a take-off speed during normal operation, the yarn being monitored with the aid of a quality sensor with regard to at least one yarn parameter, the yarn being wound in with the aid of a winding device a winding speed is wound onto a tube and a bobbin is formed, the yarn being moved back and forth along a traversing width when being wound onto the tube, and a stop sequence being initiated upon detection of a yarn defect-related deviation from a target value of the at least one yarn parameter by the quality sensor .
  • the invention further relates to a workstation of a spinning machine.
  • the spinning machines can be designed, for example, as air-jet spinning machines or rotor spinning machines.
  • the aim here is to initiate a stop sequence in the event of a deviation from a target value of at least one yarn parameter.
  • a method for operating a spinning station of a spinning machine in which a stop sequence is initiated upon detection of a defined deviation of a monitored yarn parameter from at least one setpoint.
  • the spinning unit and the winding unit are stopped in such a way that the last yarn section produced does not completely run onto the tube located in the winding device.
  • the yarn section that has the detected deviation in the yarn parameter is wound onto the tube with an indeterminate length of subsequent yarn. This indefinite length of subsequent yarn must then be used be unwound and cut off again. This creates a large amount of yarn waste.
  • the object of the present invention is to eliminate the disadvantages known from the prior art.
  • the task is, in particular, to create a method for operating a workstation of a spinning machine and a workstation that makes it easier to locate the end of the yarn, improves the winding of the yarn onto the tube and/or reduces yarn waste.
  • the spinning machine is preferably an air or rotor spinning machine.
  • the spinning unit includes, for example, a vortex chamber or a rotor and produces the yarn from a supplied fiber material.
  • the yarn is then drawn off from the spinning unit by a take-off device.
  • the withdrawal speed is the speed of the yarn at which it is withdrawn from the spinning unit.
  • the workstation usually includes other elements necessary for yarn production, such as a drafting system for stretching and/or an opening roller for separating the fiber structure.
  • the yarn After leaving the outlet of the spinning unit, the yarn is monitored with the aid of a quality sensor with regard to at least one yarn parameter.
  • yarn parameters include thickness and hairiness or to understand other parameters that characterize the quality of the yarn or their fluctuations over time.
  • the yarn is then wound onto a tube at a winding speed using a winding device and a bobbin is thus formed, with the yarn being moved back and forth along a traversing width when being wound onto the tube.
  • the workstation has a traversing device for moving the yarn back and forth along the traversing width.
  • the traversing width is the distance between the two turning points of the traversing device.
  • the term sleeve refers to the body onto which the yarn is wound.
  • the term spool is understood to mean the combination of the sleeve mentioned and the yarn located on the sleeve.
  • the winding speed is the speed at which the yarn is wound onto the tube or onto the surface of the spool.
  • the winding speed is therefore the speed of the yarn shortly before it runs onto the tube or onto the bobbin.
  • the winding speed is primarily dependent on the speed of the sleeve or bobbin, the outer diameter of the bobbin, the traversing width and/or a traversing frequency with which the traversing device moves along the traversing width.
  • a stop sequence is a sequence that stops the normal operation of the workstation.
  • the stop sequence is the chronological sequence of different operations when normal operation is stopped.
  • Individual elements, such as the spinning unit, the winding device, the take-off device and/or the traversing device, can be stopped step by step or simultaneously.
  • the quality sensor can be arranged between the spinning unit and the take-off device. Additionally or alternatively, the quality sensor can be arranged between the take-off device and the winding device.
  • the method provides that the winding speed is reduced during the stop sequence, with a yarn loop forming due to the resulting speed difference between the winding speed and the take-off speed.
  • the take-off speed remains essentially constant and/or the reduction in the take-off speed is less than the reduction in the winding speed, so that the yarn loop is formed.
  • the position of the defect between the quality sensor and the winding device and/or on the bobbin can be localized more precisely due to the slowed down winding.
  • the yarn tension during the slow winding of the yarn onto the tube during the stop sequence remains approximately constant despite the difference in speed due to the yarn loop formed. In this way, fluctuations in the yarn tension that arise from reducing the winding speed and/or from moving the traversing device back and forth along the traversing width with the traversing frequency can be compensated for.
  • the traversing width is reduced during the reduction of the winding speed and/or subsequently.
  • the yarn runs onto the sleeve or onto the tube within this reduced traversing width surface of the coil. This can ensure that the defect then runs onto the spool within this traversing width. This makes finding this defect easier.
  • the lower yarn tension resulting from reducing the traversing width can be compensated for by increasing the size of the yarn loop. In this way, constant yarn tension can still be guaranteed while at the same time reducing the traversing width.
  • the yarn is separated in the area of the yarn loop, with a resulting yarn end on the bobbin side being guided towards the bobbin at the winding speed. If the yarn is separated in the area of the yarn loop after the winding speed is reduced, the end of the yarn is guided slowly towards the bobbin. Due to the reduced winding speed, the end of the yarn can be stopped before it emerges, especially at a pick-up position. This makes it easier to find and/or pick up during a subsequent piecing process. If the yarn is additionally or alternatively cut after reducing the traversing width in the area of the yarn loop, the position of the defect and/or the yarn end can be additionally limited in width when it is guided towards the bobbin.
  • the buffer store preferably works pneumatically and sucks in the yarn using negative pressure.
  • the buffer storage ensures that the yarn tension is maintained. If the yarn loop is separated in the buffer, the yarn end on the spool side can be led out of the buffer again against the direction of the suction when it moves towards the bobbin. The yarn end on the take-off side can be diverted or sucked away by means of the pneumatically operating buffer.
  • a yarn cutting device is advantageously arranged in the intermediate storage.
  • the yarn sucked into the buffer by means of negative pressure is then separated by the yarn separating device.
  • the yarn separating device By arranging the yarn separating device within the intermediate storage, the sharpest possible yarn end can be produced, in particular by maintaining the yarn tension. This sharp yarn end simplifies subsequent locating, picking up and/or spinning.
  • the arrangement of the yarn separating device within the intermediate storage has the advantage that the most compact workstation possible is created.
  • the traversing width is reduced to almost zero, whereby the yarn runs onto the bobbin in at least one parallel winding.
  • the reduction of the traversing width to approximately zero is to be understood as meaning that the yarn can wind onto the surface of the bobbin in approximately parallel windings.
  • the windings of the yarn are strung together with a small width, so that parallel windings are created.
  • the defect runs onto the surface of the coil in the area of the at least one parallel winding.
  • the end of the yarn on the spool side is preferably stopped before it runs onto the spool.
  • the at least one parallel winding runs onto the center of the coil.
  • the traversing width which is preferably reduced to approximately zero, is thus formed centrally to the coil.
  • the defect runs onto the surface of the coil in the middle of the area of at least one parallel winding.
  • the spool-side yarn end is preferably stopped before it runs onto the spool, with the pick-up position of the spool-side yarn end thus being arranged essentially centrally to the spool. Through the central pick-up position of the yarn end on the spool side makes it easier to find and/or pick up.
  • the take-off speed and/or the winding speed is reduced to a standstill.
  • the yarn monitor is preferably arranged between the take-off device and the winding device and/or between the intermediate store forming the thread loop and the winding device. In this way, the end of the yarn on the spool side can be detected before it runs onto the spool. Additionally or alternatively, the traversing device can be stopped. This allows the stop sequence to complete. The defect can then advantageously be removed and/or the piecing process can be started.
  • the winding device continues to operate after the yarn monitor has detected the passage of the yarn end on the spool side until the yarn section with the deviation caused by the yarn defect runs onto the surface of the spool and/or the yarn end on the spool side is arranged at a pick-up position. This ensures that the pick-up position remains constant at all times.
  • the invention further relates to a workstation of a spinning machine, with a withdrawal device for withdrawing a yarn from a spinning unit, with a quality sensor for monitoring the yarn with regard to at least one yarn parameter, with a winding device for winding the yarn onto a tube, and with a traversing device for back and forth moving the yarn along a traversing width during winding.
  • the workstation has a control unit which is designed to operate the workstation according to the previous description, whereby the features mentioned can be present individually or in any combination.
  • the workstation has a, preferably pneumatically operating, buffer for forming a yarn loop.
  • the buffer has a yarn cutting device for cutting the yarn in the area of the yarn loop.
  • Figure 1 shows a section of a schematic front view of a workstation 1 of a spinning machine during normal operation.
  • a yarn 3 is drawn off from a spinning unit 4 at a take-off speed by means of a take-off device 2.
  • the take-off device 2 is preferably designed in the form of a pair of take-off rollers.
  • the spinning unit 4 is a spinneret with a vortex chamber of an air-jet spinning machine, in which fibers of a fiber material are twisted into the yarn 3 using a vortex air flow.
  • the feeding of the fiber material, which in air-jet spinning machines is usually achieved by means of a drafting system, is not shown here.
  • the fiber material is usually dissolved into its individual fibers using a dissolving device.
  • the spinning unit 4 has a rapidly rotating rotor to form the yarn 3.
  • the yarn 3 After leaving the spinning unit 4, the yarn 3 is monitored with the aid of a quality sensor 5 with regard to at least one yarn parameter. With the help of a yarn monitor 15, the presence of the yarn 3 can then also be monitored. The yarn 3 is then wound onto a tube 7 at a winding speed using a winding device 6, whereby a bobbin 8 is created. For additional guidance of the yarn 3, a yarn guide element 9 can be arranged between the yarn monitor 15 and the winding device 6. To produce a cheese, the yarn 3 is moved back and forth along a traversing width CB when winding onto the sleeve 7 or onto the surface of the spool 8 using a traversing device 10.
  • the traversing width CB is selected such that the traversing device 10 can distribute the yarn 3 evenly over a winding width SB on the sleeve 7 or on the surface of the bobbin 8.
  • the traversing width CB during normal operation of the workstation 1 is essentially equal to the winding width SB.
  • the workplace 1 has a control unit 11.
  • the control unit 11 is designed in such a way that it can operate the components of the workstation 1 according to appropriately stored specifications, in particular according to the previous and/or subsequent description. Additionally or alternatively, the control unit 11 can be arranged centrally on the spinning machine and operate one or more work stations 1 of the spinning machine according to the specifications. The control unit 11 is in operative connection with the workstation 1.
  • a yarn loop S is formed by reducing the winding speed and the resulting speed difference between the winding speed and the take-off speed.
  • the winding speed depends primarily on the speed of the sleeve 7 or the spool 8, which is introduced by the winding device 6, and its diameter.
  • the take-off speed is primarily dependent on the rotation speed of the take-off roller pair of the take-off device 2.
  • the workstation 1 has a buffer 12 to form the yarn loop S.
  • the buffer 12 is preferably operated pneumatically.
  • the buffer 12 is arranged between the quality sensor 5 and the yarn monitor 15 or between the take-off device 2 and the yarn monitor 15. Due to the slower winding speed, the yarn error-related deviation F is then guided more slowly towards the bobbin 8.
  • the traversing width CB is reduced.
  • Figure 3 shows this point in time in the stop sequence, with the traversing width CB reduced to approximately zero.
  • the yarn loop S can be enlarged by reducing the traversing width CB.
  • the yarn 3 is separated in the area of the yarn loop S using a yarn cutting device 13.
  • a resulting yarn end 14 on the bobbin side is guided further towards the bobbin 8 at the winding speed together with the yarn error-related deviation F.
  • This point in time of the stop sequence is in Figure 4 shown.
  • the winding speed is reduced to a standstill.
  • the yarn end 14 on the spool side comes to a standstill before running onto the surface of the spool 8.
  • the position of the yarn end 14 on the spool side shown is called the pick-up position.
  • the pick-up position is arranged essentially centrally to the sleeve 7 or to the coil 8.
  • the yarn error-related deviation F is wound on the surface of the spool 8 in the area of the at least parallel winding PW.
  • the spinning unit 4 can stop the production of the yarn 3 and then the take-off speed can be reduced to a standstill.
  • the yarn 3 produced after the yarn 3 has been cut can be sucked out using the buffer 12. The stop sequence is then ended.
  • the yarn end 14 on the spool side can be prepared for piecing.
  • the spool-side yarn end 14 is picked up at the pick-up position with the help of the workstation's own means and/or with the help of a service robot, the at least one parallel winding PW is unwound from the spool 8, the yarn error-related deviation F is removed and the spinning unit 4 is returned.
  • work station 1 can resume normal operation.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Quality & Reliability (AREA)
  • Mechanical Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Betreiben einer Arbeitsstelle einer Spinnmaschine, wobei ein Garn während eines Normalbetriebs in einer Abzugsgeschwindigkeit aus einer Spinneinheit abgezogen wird, wobei das Garn mit Hilfe eines Qualitätssensors hinsichtlich wenigstens eines Garnparameters überwacht wird, wobei das Garn mit Hilfe einer Spulvorrichtung in einer Spulgeschwindigkeit auf eine Hülse aufgespult und eine Spule gebildet wird, wobei das Garn beim Aufspulen auf die Hülse entlang einer Changierbreite hin und her bewegt wird, und wobei bei Detektion einer garnfehlerbedingten Abweichung von einem Sollwert des wenigstens einen Garnparameters durch den Qualitätssensor eine Stoppsequenz eingeleitet wird. Ferner betrifft die Erfindung eine Arbeitsstelle einer Spinnmaschine.The present invention relates to a method for operating a workstation of a spinning machine, wherein a yarn is drawn off from a spinning unit at a take-off speed during normal operation, the yarn being monitored with the aid of a quality sensor with regard to at least one yarn parameter, the yarn being wound in with the aid of a winding device a winding speed is wound onto a tube and a bobbin is formed, the yarn being moved back and forth along a traversing width when being wound onto the tube, and a stop sequence being initiated upon detection of a yarn defect-related deviation from a target value of the at least one yarn parameter by the quality sensor . The invention further relates to a workstation of a spinning machine.

Gattungsgemäße Spinnmaschine und Verfahren zum Betreiben einer Arbeitsstelle derartiger Spinnmaschinen sind im Stand der Technik hinlänglich bekannt. Die Spinnmaschinen können dabei beispielsweise als Luftspinnmaschinen oder Rotorspinnmaschinen ausgebildet sein. Ziel ist es hierbei, bei einer Abweichung von einem Sollwert wenigstens eines Garnparameters eine Stoppsequenz einzuleiten.Generic spinning machines and methods for operating a workplace of such spinning machines are well known in the prior art. The spinning machines can be designed, for example, as air-jet spinning machines or rotor spinning machines. The aim here is to initiate a stop sequence in the event of a deviation from a target value of at least one yarn parameter.

So ist beispielsweise aus der DE10 2015 110 486 A1 ein Verfahren zum Betreiben einer Spinnstelle einer Spinnmaschine bekannt, bei welchem bei Detektion einer definierten Abweichung eines überwachten Garnparameters von zumindest einem Sollwert eine Stoppsequenz eingeleitet wird. Im Rahmen der Stoppsequenz werden die Spinneinheit und die Spuleinheit derart gestoppt, dass der zuletzt hergestellte Garnabschnitt nicht vollständig auf die sich in der Spulvorrichtung befindlichen Hülse aufläuft. Oftmals wird der Garnabschnitt, der die detektierte Abweichung des Garnparameters aufweist, mit einer unbestimmten Länge an nachfolgendem Garn auf die Hülse aufgespult. Diese unbestimmte Länge an nachfolgendem Garn muss anschließend wieder abgespult und abgeschnitten werden. Dadurch wird eine große Menge an Garnausschuss erzeugt.For example, from the DE10 2015 110 486 A1 a method for operating a spinning station of a spinning machine is known, in which a stop sequence is initiated upon detection of a defined deviation of a monitored yarn parameter from at least one setpoint. As part of the stop sequence, the spinning unit and the winding unit are stopped in such a way that the last yarn section produced does not completely run onto the tube located in the winding device. Often the yarn section that has the detected deviation in the yarn parameter is wound onto the tube with an indeterminate length of subsequent yarn. This indefinite length of subsequent yarn must then be used be unwound and cut off again. This creates a large amount of yarn waste.

Aufgabe der vorliegenden Erfindung ist es, die aus dem Stand der Technik bekannten Nachteile zu beseitigen. Aufgabe ist es insbesondere ein Verfahren zum Betreiben einer Arbeitsstelle einer Spinnmaschine und eine Arbeitsstelle zu schaffen, welche das Aufsuchen des Garnendes erleichtert, das Aufspulen des Garns auf die Hülse verbessert und/oder den Garnausschuss verringert.The object of the present invention is to eliminate the disadvantages known from the prior art. The task is, in particular, to create a method for operating a workstation of a spinning machine and a workstation that makes it easier to locate the end of the yarn, improves the winding of the yarn onto the tube and/or reduces yarn waste.

Die Aufgabe wird gelöst durch ein Verfahren zum Betreiben einer Arbeitsstelle einer Spinnmaschine und eine Arbeitsstelle mit den Merkmalen der unabhängigen Patentansprüche.The task is solved by a method for operating a workstation of a spinning machine and a workstation with the features of the independent patent claims.

Vorgeschlagen wird ein Verfahren zum Betreiben einer Arbeitsstelle einer Spinnmaschine, wobei ein Garn während eines Normalbetriebs in einer Abzugsgeschwindigkeit aus einer Spinneinheit abgezogen wird. Bei der Spinnmaschine handelt es sich vorzugsweise um eine Luft- oder Rotorspinnmaschine. Die Spinneinheit umfasst je nach Art zum Einsatz kommenden Spinnmaschine beispielsweise eine Wirbelkammer oder einen Rotor und erzeugt aus einem zugeführten Fasermaterial das Garn. Das Garn wird anschließend durch eine Abzugseinrichtung aus der Spinneinheit abgezogen. Als Abzugsgeschwindigkeit ist dabei die Geschwindigkeit des Garns zu verstehen, mit welcher dieses aus der Spinneinheit abgezogen wird. Ferner umfasst die Arbeitsstelle in der Regel weitere für die Garnherstellung notwendige Elemente, wie beispielsweise ein Streckwerk zum Verstrecken und/oder eine Auflösewalze zum Vereinzeln des Faserverbands.What is proposed is a method for operating a workstation of a spinning machine, wherein a yarn is drawn off from a spinning unit at a take-off speed during normal operation. The spinning machine is preferably an air or rotor spinning machine. Depending on the type of spinning machine used, the spinning unit includes, for example, a vortex chamber or a rotor and produces the yarn from a supplied fiber material. The yarn is then drawn off from the spinning unit by a take-off device. The withdrawal speed is the speed of the yarn at which it is withdrawn from the spinning unit. Furthermore, the workstation usually includes other elements necessary for yarn production, such as a drafting system for stretching and/or an opening roller for separating the fiber structure.

Nach Verlassen des Auslasses der Spinneinheit wird das Garn mit Hilfe eines Qualitätssensors hinsichtlich wenigstens eines Garnparameters überwacht. Als Garnparameter sind dabei beispielsweise die Dicke, die Haarigkeit oder sonstige, die Qualität des Garns charakterisierende Kenngrößen oder deren zeitliche Schwankungen zu verstehen.After leaving the outlet of the spinning unit, the yarn is monitored with the aid of a quality sensor with regard to at least one yarn parameter. Examples of yarn parameters include thickness and hairiness or to understand other parameters that characterize the quality of the yarn or their fluctuations over time.

Das Garn wird anschließend mit Hilfe einer Spulvorrichtung in einer Spulgeschwindigkeit auf eine Hülse aufgespult und so eine Spule gebildet, wobei das Garn beim Aufspulen auf die Hülse entlang einer Changierbreite hin und her bewegt wird. Zum hin und her Bewegen des Garns entlang der Changierbreite weist die Arbeitsstelle eine Changiereinrichtung auf. Die Changierbreite ist dabei der Abstand zwischen den beiden Wendepunkten der Changiereinrichtung. Unter dem Begriff Hülse ist der Körper zu verstehen, auf den das Garn aufgespult wird. Unter dem Begriff Spule ist die Kombination der genannten Hülse und dem sich auf der Hülse befindlichen Garn zu verstehen. Als Spulgeschwindigkeit ist die Geschwindigkeit des Garns zu verstehen, mit welcher dieses auf die Hülse bzw. auf die Oberfläche der Spule aufgespult wird. Die Spulgeschwindigkeit ist somit die Geschwindigkeit des Garns kurz bevor es auf die Hülse bzw. auf die Spule aufläuft. Die Spulgeschwindigkeit ist dabei vor allem von der Drehzahl der Hülse bzw. Spule, des äußeren Durchmessers der Spule, der Changierbreite und/oder einer Changierfrequenz, mit welcher sich die Changiereinrichtung entlang der Changierbreite bewegt, abhängig.The yarn is then wound onto a tube at a winding speed using a winding device and a bobbin is thus formed, with the yarn being moved back and forth along a traversing width when being wound onto the tube. The workstation has a traversing device for moving the yarn back and forth along the traversing width. The traversing width is the distance between the two turning points of the traversing device. The term sleeve refers to the body onto which the yarn is wound. The term spool is understood to mean the combination of the sleeve mentioned and the yarn located on the sleeve. The winding speed is the speed at which the yarn is wound onto the tube or onto the surface of the spool. The winding speed is therefore the speed of the yarn shortly before it runs onto the tube or onto the bobbin. The winding speed is primarily dependent on the speed of the sleeve or bobbin, the outer diameter of the bobbin, the traversing width and/or a traversing frequency with which the traversing device moves along the traversing width.

Bei Detektion einer garnfehlerbedingten Abweichung von einem Sollwert des wenigstens einen Garnparameters durch den Qualitätssensor wird anschließend eine Stoppsequenz eingeleitet. Der Garnabschnitt, der die garnfehlerbedingte Abweichung von dem Sollwert des wenigstens einen Garnparameters aufweist, kann als Fehlstelle bezeichnet werden. Als Stoppsequenz ist eine Sequenz zu verstehen, welche den Normalbetrieb der Arbeitsstelle stoppt. Die Stoppsequenz ist dabei die zeitliche Abfolge unterschiedlicher Operationen beim Stoppen des Normalbetriebs. Dabei können einzelne Elemente, wie beispielsweise die Spinneinheit, die Spulvorrichtung, die Abzugseinrichtung und/oder die Changiereinrichtung schrittweise oder gleichzeitig gestoppt werden. Zum Überwachen des wenigstens einen Garnparameters des Garns nach dem Verlassen des Auslasses der Spinneinheit kann der Qualitätssensor zwischen der Spinneinheit und der Abzugseinrichtung angeordnet sein. Zusätzlich oder alternativ kann der Qualitätssensor zwischen der Abzugseinrichtung und der Spuleinrichtung angeordnet sein.When a yarn defect-related deviation from a target value of the at least one yarn parameter is detected by the quality sensor, a stop sequence is then initiated. The yarn section that has the yarn defect-related deviation from the target value of the at least one yarn parameter can be referred to as a defect. A stop sequence is a sequence that stops the normal operation of the workstation. The stop sequence is the chronological sequence of different operations when normal operation is stopped. Individual elements, such as the spinning unit, the winding device, the take-off device and/or the traversing device, can be stopped step by step or simultaneously. For monitoring the at least one yarn parameter of the yarn after leaving the outlet of the spinning unit, the quality sensor can be arranged between the spinning unit and the take-off device. Additionally or alternatively, the quality sensor can be arranged between the take-off device and the winding device.

Bei dem Verfahren ist vorgesehen, dass während der Stoppsequenz die Spulgeschwindigkeit verringert wird, wobei sich aufgrund des dadurch resultierenden Geschwindigkeitsunterschieds zwischen Spulgeschwindigkeit und Abzugsgeschwindigkeit eine Garnschleife bildet. Die Abzugsgeschwindigkeit bleibt hierbei im Wesentlichen konstant und/oder die Verringerung der Abzugsgeschwindigkeit ist geringer als die Verringerung der Spulgeschwindigkeit, so dass sich die Garnschleife bildet. Durch die Verringerung der Spulgeschwindigkeit während der Stoppsequenz und somit nach der Detektion der garnfehlerbedingten Abweichung von dem Sollwert des wenigstens einen Garnparameters wird das Aufspulen des Garns verlangsamt. Die Fehlstelle des Garns wird somit nicht oder nur verlangsamt auf die Hülse bzw. die Oberfläche der Spule aufgespult. Zudem kann durch das verlangsamte Aufspulen die Position der Fehlstelle zwischen dem Qualitätssensor und der Spulvorrichtung und/oder auf der Spule genauer lokalisiert werden. Die Garnspannung beim verlangsamten Aufspulen des Garns auf die Hülse während der Stoppsequenz bleibt trotz des Geschwindigkeitsunterschiedes aufgrund der gebildeten Garnschleife annähernd konstant. So können Schwankungen in der Garnspannung, welche durch die Verringerung der Spulgeschwindigkeit und/oder durch das hin und her Bewegen der Changiereinrichtung entlang der Changierbreite mit der Changierfrequenz entstehen, ausgeglichen werden.The method provides that the winding speed is reduced during the stop sequence, with a yarn loop forming due to the resulting speed difference between the winding speed and the take-off speed. The take-off speed remains essentially constant and/or the reduction in the take-off speed is less than the reduction in the winding speed, so that the yarn loop is formed. By reducing the winding speed during the stop sequence and thus after the detection of the yarn error-related deviation from the setpoint of the at least one yarn parameter, the winding of the yarn is slowed down. The defect in the yarn is therefore not wound onto the sleeve or the surface of the spool or only at a slower rate. In addition, the position of the defect between the quality sensor and the winding device and/or on the bobbin can be localized more precisely due to the slowed down winding. The yarn tension during the slow winding of the yarn onto the tube during the stop sequence remains approximately constant despite the difference in speed due to the yarn loop formed. In this way, fluctuations in the yarn tension that arise from reducing the winding speed and/or from moving the traversing device back and forth along the traversing width with the traversing frequency can be compensated for.

Erfindungsgemäß ist bei dem Verfahren vorgesehen, dass während der Verringerung der Spulgeschwindigkeit und/oder daran anschließend die Changierbreite reduziert wird. Durch die Reduzierung der Changierbreite läuft das Garn innerhalb dieser reduzierten Changierbreite auf die Hülse bzw. auf die Oberfläche der Spule auf. Dadurch kann gewährleistet werden, dass anschließend die Fehlstelle innerhalb dieser Changierbreite auf die Spule aufläuft. Dadurch wird das Auffinden dieser Fehlstelle erleichtert. Die durch die Reduzierung der Changierbreite entstehende niedrigere Garnspannung kann durch eine Vergrößerung der Garnschleife kompensiert werden. So kann auch hier weiterhin eine konstante Garnspannung bei gleichzeitig geringerer Changierbreite gewährleistet werden.According to the invention, it is provided in the method that the traversing width is reduced during the reduction of the winding speed and/or subsequently. By reducing the traversing width, the yarn runs onto the sleeve or onto the tube within this reduced traversing width surface of the coil. This can ensure that the defect then runs onto the spool within this traversing width. This makes finding this defect easier. The lower yarn tension resulting from reducing the traversing width can be compensated for by increasing the size of the yarn loop. In this way, constant yarn tension can still be guaranteed while at the same time reducing the traversing width.

Nachfolgend an die Verringerung der Spulgeschwindigkeit und/oder nach der Reduzierung der Changierbreite wird das Garn im Bereich der Garnschleife zertrennt, wobei ein daraus resultierendes spulenseitiges Garnende mit der Spulgeschwindigkeit in Richtung Spule geführt wird. Wird das Garn im Bereich der Garnschleife nachfolgend an die Verringerung der Spulgeschwindigkeit zertrennt, so wird das Garnende verlangsamt in Richtung Spule geführt. Aufgrund der verringerten Spulgeschwindigkeit kann das Garnende vor dem Auflaufen, insbesondere an einer Aufgreifposition, gestoppt werden. Dadurch kann es bei einem nachfolgenden Anspinnvorgang einfacher gefunden und/oder aufgenommen werden. Wird das Garn zusätzlich oder alternativ nach der Reduzierung der Changierbreite im Bereich der Garnschleife zertrennt, so kann die Position der Fehlstelle und/oder des Garnendes beim Führen in Richtung Spule zusätzlich in der Breite begrenzt werden.Following the reduction in the winding speed and/or after the reduction in the traversing width, the yarn is separated in the area of the yarn loop, with a resulting yarn end on the bobbin side being guided towards the bobbin at the winding speed. If the yarn is separated in the area of the yarn loop after the winding speed is reduced, the end of the yarn is guided slowly towards the bobbin. Due to the reduced winding speed, the end of the yarn can be stopped before it emerges, especially at a pick-up position. This makes it easier to find and/or pick up during a subsequent piecing process. If the yarn is additionally or alternatively cut after reducing the traversing width in the area of the yarn loop, the position of the defect and/or the yarn end can be additionally limited in width when it is guided towards the bobbin.

Auch ist es von Vorteil, wenn die Garnschleife in einem Zwischenspeicher gebildet und/oder zertrennt wird. Der Zwischenspeicher arbeitet dabei vorzugsweise pneumatisch und saugt das Garn mittels Unterdruck ein. Durch den Zwischenspeicher kann so die Aufrechterhaltung der Garnspannung gewährleistet werden. Wird die Garnschleife im Zwischenspeicher zertrennt, so kann das spulenseitige Garnende bei dessen Bewegung in Richtung Spule wieder entgegen der Richtung der Saugwirkung aus dem Zwischenspeicher herausgeführt werden. Das abzugsseitige Garnende kann mittels des insbesondere pneumatisch arbeitenden Zwischenspeichers abgeleitet bzw. abgesaugt werden.It is also advantageous if the yarn loop is formed and/or separated in a buffer. The buffer store preferably works pneumatically and sucks in the yarn using negative pressure. The buffer storage ensures that the yarn tension is maintained. If the yarn loop is separated in the buffer, the yarn end on the spool side can be led out of the buffer again against the direction of the suction when it moves towards the bobbin. The yarn end on the take-off side can be diverted or sucked away by means of the pneumatically operating buffer.

Zum Zertrennen des Garns ist im Zwischenspeicher vorteilhafterweise eine Garntrennvorrichtung angeordnet. Das mittels Unterdruck in den Zwischenspeicher eingesaugte Garn wird anschließend durch die Garntrennvorrichtung getrennt. Durch die Anordnung der Garntrennvorrichtung innerhalb des Zwischenspeichers kann, insbesondere durch die Aufrechterhaltung der Garnspannung, ein möglichst scharfes Garnende erzeugt werden. Dieses scharfe Garnende vereinfacht dabei das anschließende Aufsuchen, Aufnehmen und/oder Anspinnen. Zudem hat die Anordnung der Garntrennvorrichtung innerhalb des Zwischenspeichers den Vorteil, dass so eine möglichst kompakte Arbeitsstelle geschaffen ist.To cut the yarn, a yarn cutting device is advantageously arranged in the intermediate storage. The yarn sucked into the buffer by means of negative pressure is then separated by the yarn separating device. By arranging the yarn separating device within the intermediate storage, the sharpest possible yarn end can be produced, in particular by maintaining the yarn tension. This sharp yarn end simplifies subsequent locating, picking up and/or spinning. In addition, the arrangement of the yarn separating device within the intermediate storage has the advantage that the most compact workstation possible is created.

Vorteile bringt es zudem mit sich, wenn die Changierbreite auf annähernd null reduziert wird, wodurch das Garn in wenigstens einer Parallelwicklung auf die Spule aufläuft. Die Reduzierung der Changierbreite auf annährend null ist hierbei derart zu verstehen, dass das Garn in annährend parallelen Wicklungen auf die Oberfläche der Spule auflaufen kann. Die Wicklungen des Garns werden dabei in einer geringen Breite aneinandergereiht, so dass Parallelwicklungen entstehen. Die Fehlstelle läuft im Bereich der wenigstens einen Parallelwicklung auf die Oberfläche der Spule auf. Das spulenseitige Garnende wird vorzugsweise vor dem Auflaufen auf die Spule gestoppt. Durch das Aufspulen in Parallelwicklung des Garns kann dieses anschließend vereinfacht wieder abgespult und bei einem an die Stoppsequenz anschließenden Anspinnprozesses zurück in die Spinneinheit geführt werden.There are also advantages if the traversing width is reduced to almost zero, whereby the yarn runs onto the bobbin in at least one parallel winding. The reduction of the traversing width to approximately zero is to be understood as meaning that the yarn can wind onto the surface of the bobbin in approximately parallel windings. The windings of the yarn are strung together with a small width, so that parallel windings are created. The defect runs onto the surface of the coil in the area of the at least one parallel winding. The end of the yarn on the spool side is preferably stopped before it runs onto the spool. By winding the yarn in parallel winding, it can then be unwound in a simpler manner and fed back into the spinning unit during a spinning process following the stop sequence.

Ebenso ist es vorteilhaft, wenn die wenigstens eine Parallelwicklung mittig auf die Spule aufläuft. Die Changierbreite, welche vorzugsweise auf annährend null reduziert ist, ist somit mittig zur Spule ausgebildet. Die Fehlstelle läuft mittig im Bereich der wenigstens eine Parallelwicklung auf die Oberfläche der Spule auf. Das spulenseitige Garnende wird vorzugsweise vor dem Auflaufen auf die Spule gestoppt, wobei die Aufgreifposition des spulenseitigen Garnendes somit im Wesentlichen mittig zur Spule angeordnet ist. Durch die mittige Aufgreifposition des spulenseitigen Garnendes kann dieses einfacher gefunden und/oder aufgenommen werden.It is also advantageous if the at least one parallel winding runs onto the center of the coil. The traversing width, which is preferably reduced to approximately zero, is thus formed centrally to the coil. The defect runs onto the surface of the coil in the middle of the area of at least one parallel winding. The spool-side yarn end is preferably stopped before it runs onto the spool, with the pick-up position of the spool-side yarn end thus being arranged essentially centrally to the spool. Through the central pick-up position of the yarn end on the spool side makes it easier to find and/or pick up.

Vorteilhaft ist es, wenn nachdem das Garn zertrennt wurde und/oder ein Garnwächter das Passieren des spulenseitigen Garnendes detektiert hat, die Abzugsgeschwindigkeit und/oder die Spulgeschwindigkeit bis zum Stillstand verringert wird. Der Garnwächter ist dabei vorzugsweise zwischen der Abzugseinrichtung und der Spulvorrichtung und/oder zwischen dem Fadenschleife bildenden Zwischenspeicher und der Spulvorrichtung angeordnet. So kann das spulenseitige Garnende vor dem Auflaufen auf die Spule detektiert werden. Zusätzlich oder alternativ kann die Changiereinrichtung angehalten werden. Dadurch kann die Stoppsequenz abgeschlossen werden. Anschließend kann vorteilhafterweise die Fehlstelle entfernt und/oder der Anspinnprozess gestartet werden.It is advantageous if, after the yarn has been cut and/or a yarn monitor has detected the passage of the yarn end on the bobbin side, the take-off speed and/or the winding speed is reduced to a standstill. The yarn monitor is preferably arranged between the take-off device and the winding device and/or between the intermediate store forming the thread loop and the winding device. In this way, the end of the yarn on the spool side can be detected before it runs onto the spool. Additionally or alternatively, the traversing device can be stopped. This allows the stop sequence to complete. The defect can then advantageously be removed and/or the piecing process can be started.

Auch ist es vorteilhaft, wenn die Spulvorrichtung nachdem der Garnwächter das Passieren des spulenseitige Garnendes detektiert hat noch so lange weiterbetrieben wird, bis der Garnabschnitt mit der garnfehlerbedingten Abweichung auf die Oberfläche der Spule aufläuft und/oder das spulenseitige Garnende an einer Aufgreifposition angeordnet ist. So kann eine stets gleichbleibende Aufgreifposition gewährleistet werden.It is also advantageous if the winding device continues to operate after the yarn monitor has detected the passage of the yarn end on the spool side until the yarn section with the deviation caused by the yarn defect runs onto the surface of the spool and/or the yarn end on the spool side is arranged at a pick-up position. This ensures that the pick-up position remains constant at all times.

Die Erfindung betrifft ferner eine Arbeitsstelle einer Spinnmaschine, mit einer Abzugseinrichtung zum Abziehen eines Garns aus einer Spinneinheit, mit einem Qualitätssensor zum Überwachen des Garns hinsichtlich wenigstens eines Garnparameters, mit einer Spulvorrichtung zum Aufspulen des Garns auf eine Hülse, und mit einer Changiereinrichtung zum hin und her Bewegen des Garns entlang einer Changierbreite während des Aufspulens. Die Arbeitsstelle weist eine Steuereinheit auf, die ausgelegt ist, die Arbeitsstelle gemäß der vorangegangenen Beschreibung zu betreiben, wobei die genannten Merkmale einzeln oder in beliebiger Kombination vorhanden sein können.The invention further relates to a workstation of a spinning machine, with a withdrawal device for withdrawing a yarn from a spinning unit, with a quality sensor for monitoring the yarn with regard to at least one yarn parameter, with a winding device for winding the yarn onto a tube, and with a traversing device for back and forth moving the yarn along a traversing width during winding. The workstation has a control unit which is designed to operate the workstation according to the previous description, whereby the features mentioned can be present individually or in any combination.

Vorteilhaft ist es, wenn die Arbeitsstelle einen, vorzugsweise pneumatisch arbeitenden, Zwischenspeicher zum Bilden einer Garnschleife aufweist.It is advantageous if the workstation has a, preferably pneumatically operating, buffer for forming a yarn loop.

Auch ist es von Vorteil, wenn der Zwischenspeicher eine Garntrennvorrichtung zum Zertrennen des Garns im Bereich der Garnschleife aufweist.It is also advantageous if the buffer has a yarn cutting device for cutting the yarn in the area of the yarn loop.

Weitere Vorteile der Erfindung sind in den nachfolgenden Ausführungsbeispielen beschrieben. Es zeigen:

Figuren 1 bis 4
eine schematische Darstellung des erfindungsgemäßen Verfahren zum Betreiben einer Arbeitsstelle einer Spinnmaschine.
Further advantages of the invention are described in the following exemplary embodiments. Show it:
Figures 1 to 4
a schematic representation of the method according to the invention for operating a workplace of a spinning machine.

Figur 1 zeigt einen Ausschnitt einer schematischen Vorderansicht einer Arbeitsstelle 1 einer Spinnmaschine während eines Normalbetriebs. Während des Normalbetriebs wird mittels einer Abzugseinrichtung 2 ein Garn 3 in einer Abzugsgeschwindigkeit aus einer Spinneinheit 4 abgezogen. Die Abzugseinrichtung 2 ist vorzugsweise in Form eines Abzugswalzenpaars ausgebildet. Im gezeigten Ausführungsbeispiel handelt es sich bei der Spinneinheit 4 um eine Spinndüse mit einer Wirbelkammer einer Luftspinnmaschine, in der Fasern eines Fasermaterials mithilfe einer Wirbelluftströmung zu dem Garn 3 verdreht werden. Die Zuführung des Fasermaterials, welche bei Luftspinnmaschinen in der Regel mittels eines Streckwerks realisiert wird, ist hierbei nicht dargestellt. Figure 1 shows a section of a schematic front view of a workstation 1 of a spinning machine during normal operation. During normal operation, a yarn 3 is drawn off from a spinning unit 4 at a take-off speed by means of a take-off device 2. The take-off device 2 is preferably designed in the form of a pair of take-off rollers. In the exemplary embodiment shown, the spinning unit 4 is a spinneret with a vortex chamber of an air-jet spinning machine, in which fibers of a fiber material are twisted into the yarn 3 using a vortex air flow. The feeding of the fiber material, which in air-jet spinning machines is usually achieved by means of a drafting system, is not shown here.

Handelt es sich alternativ bei der Arbeitsstelle 1 um eine Arbeitsstelle 1 einer Rotorspinnmaschine, so wird das Fasermaterial in der Regel mit einer Auflösevorrichtung in seine Einzelfasern aufgelöst. Anstelle einer Wirbelkammer weist dabei die Spinneinheit 4 einen schnell drehenden Rotor zur Bildung des Garns 3 auf.Alternatively, if the workstation 1 is a workstation 1 of a rotor spinning machine, the fiber material is usually dissolved into its individual fibers using a dissolving device. Instead of a vortex chamber, the spinning unit 4 has a rapidly rotating rotor to form the yarn 3.

Nach Verlassen der Spinneinheit 4 wird das Garn 3 mit Hilfe eines Qualitätssensors 5 hinsichtlich wenigstens eines Garnparameters überwacht. Mit Hilfe eines Garnwächters 15 kann im Anschluss zusätzlich das Vorhandensein des Garns 3 überwacht werden. Anschließend wird das Garn 3 mit Hilfe einer Spulvorrichtung 6 in einer Spulgeschwindigkeit auf eine Hülse 7 aufgespult, wodurch eine Spule 8 entsteht. Zum zusätzlichen Führen des Garns 3 kann zwischen dem Garnwächter 15 und der Spulvorrichtung 6 ein Garnführungselement 9 angeordnet sein. Zum Erzeugen einer Kreuzspule wird das Garn 3 beim Aufspulen auf die Hülse 7 bzw. auf die Oberfläche der Spule 8 mithilfe einer Changiereinrichtung 10 entlang einer Changierbreite CB hin und her bewegt. Im gezeigten Ausführungsbeispiel, während des Normalbetriebs der Arbeitsstelle 1, ist die Changierbreite CB derart gewählt, dass die Changiereinrichtung 10 das Garn 3 über eine Aufspulbreite SB gleichmäßig auf der Hülse 7 bzw. auf der Oberfläche der Spule 8 verteilen kann. Hierfür ist die Changierbreite CB während des Normalbetriebs der Arbeitsstelle 1 im Wesentlichen gleich der Aufspulbreite SB.After leaving the spinning unit 4, the yarn 3 is monitored with the aid of a quality sensor 5 with regard to at least one yarn parameter. With the help of a yarn monitor 15, the presence of the yarn 3 can then also be monitored. The yarn 3 is then wound onto a tube 7 at a winding speed using a winding device 6, whereby a bobbin 8 is created. For additional guidance of the yarn 3, a yarn guide element 9 can be arranged between the yarn monitor 15 and the winding device 6. To produce a cheese, the yarn 3 is moved back and forth along a traversing width CB when winding onto the sleeve 7 or onto the surface of the spool 8 using a traversing device 10. In the exemplary embodiment shown, during normal operation of the workstation 1, the traversing width CB is selected such that the traversing device 10 can distribute the yarn 3 evenly over a winding width SB on the sleeve 7 or on the surface of the bobbin 8. For this purpose, the traversing width CB during normal operation of the workstation 1 is essentially equal to the winding width SB.

Des Weiteren weißt die Arbeitsstelle 1 eine Steuereinheit 11 auf. Die Steuereinheit 11 ist derart ausgelegt, dass sie die Komponenten der Arbeitsstelle 1 nach entsprechend hinterlegten Vorgaben, insbesondere gemäß der bisherigen und/oder nachfolgenden Beschreibung betreiben kann. Zusätzlich oder alternativ kann die Steuereinheit 11 zentral an der Spinnmaschine angeordnet sein und eine oder mehrere Arbeitsstellen 1 der Spinnmaschine gemäß den Vorgaben betreiben. Dabei steht die Steuereinheit 11 mit der Arbeitsstelle 1 in Wirkverbindung.Furthermore, the workplace 1 has a control unit 11. The control unit 11 is designed in such a way that it can operate the components of the workstation 1 according to appropriately stored specifications, in particular according to the previous and/or subsequent description. Additionally or alternatively, the control unit 11 can be arranged centrally on the spinning machine and operate one or more work stations 1 of the spinning machine according to the specifications. The control unit 11 is in operative connection with the workstation 1.

Kommt es während des Normalbetriebs der Arbeitsstelle 1 zu einer garnfehlerbedingten Abweichung F des wenigstens einen Garnparameters von einem Sollwert, so wird, wie in Figur 2 dargestellt, nach der Detektion der garnfehlerbedingten Abweichung F durch den Qualitätssensor 5 eine Stoppsequenz eingeleitet.If there is a yarn error-related deviation F of the at least one yarn parameter from a target value during normal operation of the workstation 1, then, as in Figure 2 shown, after the detection of the yarn defect-related deviation F by the quality sensor 5, a stop sequence is initiated.

Bei den nachfolgenden Beschreibungen der in den Figuren 2 bis 4 dargestellten Ausführungsbeispielen werden für Merkmale, die im Vergleich zum vorangestellten Ausführungsbeispiel der Figur 1 in ihrer Ausgestaltung und/oder Wirkweise identisch und/oder zumindest vergleichbar sind, gleiche Bezugszeichen verwendet. Sofern diese nicht nochmals detailliert erläutert werden, entspricht deren Ausgestaltung und/oder Wirkweise der Ausgestaltung und Wirkweise der vorstehend bereits beschriebenen Merkmale.In the following descriptions of the in the Figures 2 to 4 The exemplary embodiments shown are for features that are compared to the previous exemplary embodiment Figure 1 are identical and/or at least comparable in their design and/or mode of operation, the same reference numerals are used. Unless these are explained again in detail, their design and/or mode of operation corresponds to the design and mode of operation of the features already described above.

Zu Beginn der Stoppsequenz wird, wie in Figur 2 dargestellt, durch Verringerung der Spulgeschwindigkeit und des dadurch resultierenden Geschwindigkeitsunterschieds zwischen Spulgeschwindigkeit und Abzugsgeschwindigkeit eine Garnschleife S gebildet. Die Spulgeschwindigkeit ist dabei vor allem von der Drehzahl der Hülse 7 bzw. der Spule 8, welche durch die Spulvorrichtung 6 eingebracht wird und dessen Durchmesser, abhängig. Die Abzugsgeschwindigkeit ist dabei vor allem von der Rotationsgeschwindigkeit des Abzugswalzenpaars der Abzugseinrichtung 2 abhängig.At the beginning of the stop sequence, as in Figure 2 shown, a yarn loop S is formed by reducing the winding speed and the resulting speed difference between the winding speed and the take-off speed. The winding speed depends primarily on the speed of the sleeve 7 or the spool 8, which is introduced by the winding device 6, and its diameter. The take-off speed is primarily dependent on the rotation speed of the take-off roller pair of the take-off device 2.

Die Arbeitsstelle 1 weist zum Bilden der Garnschleife S einen Zwischenspeicher 12 auf. Zum Einsaugen der Garnschleife S wird der Zwischenspeicher 12 vorzugsweise pneumatisch betrieben. Vorzugsweise ist der Zwischenspeicher 12, wie im gezeigten Ausführungsbeispiel dargestellt, zwischen dem Qualitätssensor 5 und dem Garnwächter 15 bzw. zwischen der Abzugseinrichtung 2 und dem Garnwächter 15 angeordnet. Aufgrund der langsameren Spulgeschwindigkeit wird die garnfehlerbedingte Abweichung F anschließend verlangsamt in Richtung Spule 8 geführt.The workstation 1 has a buffer 12 to form the yarn loop S. To suck in the yarn loop S, the buffer 12 is preferably operated pneumatically. Preferably, the buffer 12, as shown in the exemplary embodiment shown, is arranged between the quality sensor 5 and the yarn monitor 15 or between the take-off device 2 and the yarn monitor 15. Due to the slower winding speed, the yarn error-related deviation F is then guided more slowly towards the bobbin 8.

Während und/oder anschließend an die Verringerung der Spulgeschwindigkeit wird die Changierbreite CB reduziert. Figur 3 zeigt diesen Zeitpunkt der Stoppsequenz, wobei die Changierbreite CB auf annähernd null reduziert ist. Durch die Reduzierung der Changierbreite CB auf annährend null entsteht wenigstens eine Parallelwicklung PW des Garns 3 auf der Oberfläche der Spule 8. Zusätzlich kann durch die Reduzierung der Changierbreite CB die Garnschleife S vergrößert werden.During and/or following the reduction in the winding speed, the traversing width CB is reduced. Figure 3 shows this point in time in the stop sequence, with the traversing width CB reduced to approximately zero. By reducing the traversing width CB to approximately zero, at least one parallel winding PW of the yarn 3 is created on the surface of the Bobbin 8. In addition, the yarn loop S can be enlarged by reducing the traversing width CB.

Anschließend an die Verringerung der Spulgeschwindigkeit und der Reduzierung der Changierbreite CB wird das Garn 3 im Bereich der Garnschleife S mithilfe einer Garntrennvorrichtung 13 zertrennt. Ein daraus resultierendes spulenseitiges Garnende 14 wird zusammen mit der garnfehlerbedingte Abweichung F mit der Spulgeschwindigkeit weiter in Richtung Spule 8 geführt. Dieser Zeitpunkt der Stoppsequenz ist in Figur 4 dargestellt. Nachdem das Garn 3 zertrennt wurde und/oder nachdem das spulenseitige Garnende 14 den Garnwächter 15 passiert hat, wird die Spulgeschwindigkeit bis zum Stillstand verringert. Wie im gezeigten Ausführungsbeispiel dargestellt, kommt das spulenseitige Garnende 14 vor dem Auflaufen auf die Oberfläche der Spule 8 zum Stehen. Die in Figur 4 dargestellte Position des spulenseitigen Garnendes 14 wird Aufgreifposition genannt. Die Aufgreifposition ist im Wesentlichen Mittig zur Hülse 7 bzw. zur Spule 8 angeordnet. Die garnfehlerbedingte Abweichung F ist im Bereich der wenigstens Parallelwicklung PW auf der Oberfläche der Spule 8 aufgespult. Darüber hinaus kann die Spinneinheit 4 die Produktion des Garns 3 einstellen und anschließend die Abzugsgeschwindigkeit bis zum Stillstand verringert werden. Das anschließend an das Zertrennen des Garns 3 hergestellte Garn 3 kann mithilfe des Zwischenspeichers 12 abgesaugt werden. Die Stoppsequenz ist anschließend beendet.Following the reduction in the winding speed and the reduction in the traversing width CB, the yarn 3 is separated in the area of the yarn loop S using a yarn cutting device 13. A resulting yarn end 14 on the bobbin side is guided further towards the bobbin 8 at the winding speed together with the yarn error-related deviation F. This point in time of the stop sequence is in Figure 4 shown. After the yarn 3 has been cut and/or after the yarn end 14 on the bobbin side has passed the yarn monitor 15, the winding speed is reduced to a standstill. As shown in the exemplary embodiment shown, the yarn end 14 on the spool side comes to a standstill before running onto the surface of the spool 8. In the Figure 4 The position of the yarn end 14 on the spool side shown is called the pick-up position. The pick-up position is arranged essentially centrally to the sleeve 7 or to the coil 8. The yarn error-related deviation F is wound on the surface of the spool 8 in the area of the at least parallel winding PW. In addition, the spinning unit 4 can stop the production of the yarn 3 and then the take-off speed can be reduced to a standstill. The yarn 3 produced after the yarn 3 has been cut can be sucked out using the buffer 12. The stop sequence is then ended.

Nachfolgend an die Stoppsequenz kann das spulenseitige Garnende 14 zum Anspinnen präpariert werden. Hierfür wird mithilfe von arbeitsstelleneigenen Mitteln und/oder mithilfe von einem Serviceroboter das spulenseitige Garnende 14 an der Aufgreifposition aufgegriffen, die wenigstens eine Parallelwicklung PW von der Spule 8 abgespult, die garnfehlerbedingte Abweichung F entfernt und die Spinneinheit 4 zurückgeführt. Nach dem Anspinnen kann die Arbeitsstelle 1 den Normalbetrieb wiederaufnehmen.Following the stop sequence, the yarn end 14 on the spool side can be prepared for piecing. For this purpose, the spool-side yarn end 14 is picked up at the pick-up position with the help of the workstation's own means and/or with the help of a service robot, the at least one parallel winding PW is unwound from the spool 8, the yarn error-related deviation F is removed and the spinning unit 4 is returned. After piecing, work station 1 can resume normal operation.

Die vorliegende Erfindung ist nicht auf die dargestellten und beschriebenen Ausführungsbeispiele beschränkt. Abwandlungen im Rahmen der Patentansprüche sind möglich.The present invention is not limited to the exemplary embodiments shown and described. Modifications within the scope of the patent claims are possible.

BezugszeichenlisteReference symbol list

11
Arbeitsstelleplace of work
22
AbzugseinrichtungTrigger device
33
Garnyarn
44
SpinneinheitSpinning unit
55
QualitätssensorQuality sensor
66
SpulvorrichtungWinding device
77
Hülsesleeve
88th
SpuleKitchen sink
99
GarnführungselementYarn guide element
1010
ChangiereinrichtungChanging device
1111
SteuereinheitControl unit
1212
ZwischenspeicherCache
1313
GarntrennvorrichtungYarn separator
1414
Spulenseitiges GarnendeYarn end on the spool side
1515
GarnwächterYarn guard
CBCB
ChangierbreiteTraversing width
SBSB
AufspulbreiteWinding width
FF
garnfehlerbedingte AbweichungYarn defect-related deviation
SS
GarnschleifeYarn loop
PWPW
ParallelwicklungParallel winding

Claims (9)

  1. A method for operating a workstation (1) of a spinning machine,
    - wherein a yarn (3) being taken off from a spinning unit (4) during normal operation at a take-off speed,
    - wherein the yarn (3) being monitored with respect to at least one yarn parameter by means of a quality sensor (5),
    - wherein the yarn (3) being wound onto a sleeve (7) at a winding speed by means of a winding device (6) and a bobbin (8) thus being produced,
    - wherein the yarn (3) being displaced back and forth along a traversing width (CB) while winding onto the sleeve (7), and
    - wherein a stop sequence being initiated when a deviation (F) from a specified value of the at least one yarn parameter caused by a yarn defect is detected by the quality sensor (5),
    - wherein the winding speed being reduced during the stop sequence, the resulting speed differential between the winding speed and the take-off speed causing a yarn loop (S) to be formed,
    characterized in that
    the traversing width (CB) is reduced during the reducing of the winding speed and/or thereafter, and
    the yarn is cut in the region of the yarn loop (S) after the winding speed is reduced and/or after the traversing width (CB) is reduced,
    wherein a bobbin-side yarn end (14) resulting therefrom is guided toward the bobbin (8) at the winding speed.
  2. The method according to the preceding claim, characterized in that the yarn loop (S) is formed and/or cut in an intermediate storage (12).
  3. The method according to any one of the preceding claims, characterized in that the traversing width (CB) is reduced to nearly zero, whereby the yarn (3) runs onto the bobbin (8) in at least one parallel winding (PW).
  4. The method according to claim 3, characterized in that the at least one parallel winding (PW) runs onto the bobbin (8) in the center.
  5. The method according to any one of the preceding claims, characterized in that after the yarn (3) has been cut and/or after a yarn monitor (15) has detected the yarn end (14) on the bobbin side passing by, the take-off speed and/or the winding speed is reduced to a stop.
  6. The method according to claim 5, characterized in that the winding device (6) is operated further after the yarn monitor (15) has detected the yarn end (14) on the bobbin side passing by, until the yarn segment having the deviation (F) caused by the yarn defect runs onto the surface of the bobbin (8) and/or the yarn end (14) on the bobbin side is disposed in a pickup position.
  7. A workstation (1) of a spinning machine,
    - having a take-off device (2) for taking off a yarn (3) from a spinning unit (4),
    - having a quality sensor (5) for monitoring the yarn (3) with respect to at least one yarn parameter,
    - having a winding device (6) for winding up the yarn (3) onto a sleeve (7), and
    - having a traversing device (10) for displacing the yarn (3) back and forth along a traversing width (CB) during winding,
    characterized in that
    the workstation (1) comprises a control unit (11) designed for operating the workstation (1) according to any one or more of the preceding claims.
  8. The workstation (1) according to claim 7, characterized in that the workstation (1) comprises an intermediate storage (12), preferably pneumatically operated, for forming a yarn loop (S).
  9. The workstation (1) according to claim 8, characterized in that the intermediate storage (12) comprises a yarn cutting device (13) for cutting the yarn (3) in the region of the yarn loop (S).
EP22154801.9A 2021-02-04 2022-02-02 Method of operating a spinning machine work station and work station Active EP4050138B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021102656.3A DE102021102656A1 (en) 2021-02-04 2021-02-04 Method of operating a work station of a spinning machine and work station

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EP4050138A1 EP4050138A1 (en) 2022-08-31
EP4050138B1 true EP4050138B1 (en) 2023-10-25

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CN (1) CN114852789A (en)
DE (1) DE102021102656A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011053811A1 (en) 2011-09-21 2013-03-21 Rieter Ingolstadt Gmbh Spinning machine and method for interrupting the production of yarn on a spinning machine
DE102012108380A1 (en) * 2012-06-19 2013-12-19 Maschinenfabrik Rieter Ag Air-jet spinning machine and method of operating the same
DE102015110486A1 (en) 2015-06-30 2017-01-05 Rieter Ingolstadt Gmbh Spinning station of a spinning machine and method for operating a spinning station

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DE102021102656A8 (en) 2022-09-22
CN114852789A (en) 2022-08-05
DE102021102656A1 (en) 2022-08-04

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