EP2573228B2 - Spinning machine and method for discharging an end section of a thread on a spinning machine before a subsequent spinning procedure - Google Patents

Spinning machine and method for discharging an end section of a thread on a spinning machine before a subsequent spinning procedure Download PDF

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Publication number
EP2573228B2
EP2573228B2 EP12185320.4A EP12185320A EP2573228B2 EP 2573228 B2 EP2573228 B2 EP 2573228B2 EP 12185320 A EP12185320 A EP 12185320A EP 2573228 B2 EP2573228 B2 EP 2573228B2
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EP
European Patent Office
Prior art keywords
yarn
spinning
winding
traversing
spinning machine
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.)
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Application number
EP12185320.4A
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German (de)
French (fr)
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EP2573228A2 (en
EP2573228A3 (en
EP2573228B1 (en
Inventor
Adalbert Stephan
Josef Ludvícek
Gernot SCHÄFFLER
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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    • 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
    • D01H1/24Driving or stopping arrangements for twisting or spinning arrangements, e.g. spindles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H57/00Guides for filamentary materials; Supports therefor
    • B65H57/28Reciprocating or oscillating guides
    • 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
    • B65H63/02Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
    • B65H63/024Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
    • B65H63/036Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the combination of the detecting or sensing elements with other devices, e.g. stopping devices for material advancing or winding mechanism
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H15/00Piecing arrangements ; Automatic end-finding, e.g. by suction and reverse package rotation; Devices for temporarily storing yarn during piecing
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H5/00Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/60Arrangements maintaining drafting elements free of fibre accumulations
    • D01H5/66Suction devices exclusively
    • D01H5/68Suction end-catchers

Definitions

  • the present invention relates to a spinning machine with at least one spinning station, the spinning station comprising a spinning device with an inlet for a fiber material and an outlet for the yarn produced from the fiber material in the spinning device, a delivery device for feeding the fiber material into the spinning device and a winding device for Has winding of the yarn produced.
  • a method for removing an end portion of a yarn at a spinning station of a spinning machine before a subsequent piecing process comprising a spinning device with an inlet for a fiber material and an outlet for the yarn produced from the fiber material in the spinning device, a delivery device for the Has supply of the fiber material in the spinning device and a winding device for winding the yarn produced, and wherein after an interruption of the spinning process at least the end portion of the yarn to be removed is unwound from the winding device.
  • the object of the present invention is therefore to propose a spinning machine and a method for removing an end section of a yarn on a spinning machine before a subsequent piecing process, with the aid of which the piecing times can be shortened compared to the prior art.
  • the spinning station comprises a yarn end discharge which is arranged at least partially between the outlet of the spinning device (comprising, for example, a spinneret or a spinning rotor) and the winding device, and with the aid of which an end section of the yarn produced can be separated and removed from the remaining yarn ,
  • the removal of the yarn section not suitable for the piecing process can thus be carried out directly at the spinning station, specifically before a service robot or corresponding operating personnel arrives at the respective spinning station.
  • the yarn can be started immediately after the interruption for the subsequent one Prepare piecing process. While it will usually be necessary after a yarn break, Detaching the yarn end from the bobbin surface and then feeding it to the yarn end discharge (e.g. by means of a separate gripping device) opens up enormous advantages for the spinning station in accordance with the invention, in particular for performing a quality cut. In principle, it is thus possible to slowly throttle the production of the yarn after the detection of a deviation in a previously defined yarn parameter.
  • the units mentioned delivery device, winding device, take-off device
  • the yarn end is now at a defined position and can be fixed accordingly if necessary, for example with the aid of a pair of rollers of the take-off device. If the fixation finally takes place in the area of the yarn end discharge according to the invention, the yarn end can be reliably grasped by the yarn end discharge without additional handling means being necessary.
  • the end section of the yarn which does not meet the specifications is then unwound from the winding device, the end section in the case of slow throttling of the delivery speeds preferably corresponding at least to the section which was produced from the start of the throttling.
  • the unwound end section can finally from the yarn end discharge, for example, wound up or suctioned off and finally separated and discharged accordingly (e.g. into the area of a central collection point).
  • the yarn end discharge comprises a suction channel, via which the end section of the yarn can be sucked in and / or the separated end section of the yarn can be removed.
  • the suction channel can be connected to a central vacuum source of the spinning machine. It is of course also grateful to equip the suction channel with its own vacuum source, for example a Venturi nozzle, which is only put into operation if a corresponding end section of a yarn has to be removed at the respective spinning station.
  • the yarn end discharge comprises a cutting unit, by means of which the end section to be removed can be separated from the rest of the yarn.
  • a cutting unit by means of which the end section to be removed can be separated from the rest of the yarn.
  • the cutting unit is integrated in the above-mentioned suction channel, a compact unit is obtained, with the aid of which the end section to be removed can be both separated and removed, ie disposed of. If necessary, the cutting unit can be brought into the region of the end section of the yarn and / or can be switched on or off.
  • the yarn separation device of a yarn monitoring unit (“cleaner"), which can also be designed as a cutting unit if required.
  • the yarn separation device is preferably positioned between the suction channel of the yarn end discharge and the take-off device and monitors predetermined properties or the presence of the yarn produced in the area of the yarn monitoring unit.
  • a separate cutting device within the suction channel could finally be dispensed with in this embodiment.
  • the spinning station for. B. formed by a pair of draw-off rollers, take-off device for withdrawing the yarn from the spinning device, the yarn end discharge being arranged between the outlet of the spinning device and the take-off device.
  • the spinning station for. B. formed by a pair of draw-off rollers, take-off device for withdrawing the yarn from the spinning device, the yarn end discharge being arranged between the outlet of the spinning device and the take-off device.
  • the resulting yarn end can be fixed between the rollers of the take-off device if necessary, the fixing, i. H. the associated stopping of the take-off rollers can be initiated by a sensor which monitors the presence of a yarn at a defined point after the exit of the spinning device.
  • the take-off rollers finally release the yarn end before it is finally caught by the yarn end discharge and z. B. is sucked into said suction channel (with appropriate reverse rotation of the spool mounted in the winding device).
  • the advantage here lies in the fact that the yarn ends even then is still fixed by the take-off device at a defined point when the end section of the yarn is separated from the yarn end discharge and removed.
  • the robot that arrives on demand can finally grip the yarn end before the actual piecing process, so that time losses can be avoided by searching for the yarn end.
  • the winding device and / or the take-off device have a reversibly drivable drive unit. Even if it would be sufficient for the unwinding of the yarn section to be removed to equip the units mentioned with a freewheel device, it is advantageous if an active drive is possible against the conveying direction prevailing during the spinning process. In this way, a controlled unwinding of the end section of the yarn is possible, whereby an undefined overrun of the respective bobbins can be avoided.
  • the spinning machine has a multiplicity of spinning stations arranged next to one another, each spinning station comprising a separate yarn end discharge.
  • the spinning positions are independent of one another, so that the end section of the yarn which is unsuitable for spinning can always be removed at the spinning position at which re-spinning is to take place.
  • suction channel of the yarn end discharge is connected to a suction device of the delivery device.
  • suction devices are usually present, for example, in the area of a drafting device of an air spinning machine or a disintegrating roller of a rotor spinning machine and serve to remove fluff, dust or other contaminants. If the suction channel is now coupled to such a suction device, a separate suction device can be dispensed with.
  • the connection between the suction channel and the suction device of the delivery device can be done for example by means of pipe sections and / or corresponding flow switches.
  • a valve and / or a flow switch is assigned to the suction channel, with the aid of which the air pressure within the suction channel can be regulated.
  • the suction channel can be coupled to a central suction system of the spinning machine.
  • a vacuum or air flow is finally applied to the suction channel, which causes the yarn end to be sucked in.
  • the valve or the flow switch is advantageously controlled with the aid of a corresponding control unit, which in turn can be connected, for example, to a yarn sensor.
  • the winding device comprises a yarn traversing device, the yarn traversing device being associated with a yarn lifting device, with the aid of which the yarn can be brought out of the effective range of the yarn traversing device.
  • the yarn lifting device comprises a lifting element which can be moved relative to the yarn, preferably with the aid of a pneumatic cylinder.
  • the yarn finally runs over the lifting element and can therefore no longer come into contact with the traversing elements of the traversing unit.
  • the yarn lifting device, or the pneumatic cylinder moves back into its starting position, in which the traversing elements again cause a traversing movement of the yarn while it is moving from the winding device is wound up.
  • the lifting element extends at least across the width of the winding device. This ensures that the yarn is securely caught by the lifting element when it is activated. A movement of the lifting element in the width direction of the winding device (i.e. in the axial direction of an inserted bobbin) is therefore not necessary.
  • the lifting element can be rod-shaped, for example, and can be connected to a corresponding drive element, for example the pneumatic cylinder mentioned.
  • the yarn traversing device used has one or more traversing elements (e.g. in the form of a thread guide) which, if necessary, can be moved, pivoted or otherwise moved in such a way that they can be brought into a position in which they no longer come into contact with the yarn when the yarn is being unwound (from the winding device).
  • traversing elements e.g. in the form of a thread guide
  • wing traversing device This usually has two or more counter-rotating wing elements, which alternately come into contact with the yarn to be wound and finally move it back and forth accordingly when winding.
  • the unwinding position is a position in which the traversing element or elements can no longer come into contact with the yarn running between the winding device and the take-off device. If the wing elements mentioned are used, they would be rotated into a position in which the sections which come into contact with the yarn during winding are in an area which is outside the course of the yarn during unwinding.
  • the method according to the invention for removing an end section of a yarn on a spinning machine before a subsequent piecing process is finally distinguished according to the invention in that the end section of the yarn is unwound from the winding device after an interruption of the spinning process, and in that the end section is used as a component of the spinning station trained yarn end removal is detected, separated from the remaining yarn and then removed from the area of the spinning station, the yarn end removal being arranged at least partially between the outlet of the spinning device and the winding device.
  • the yarn can thus be processed individually at each spinning station before a service robot or corresponding operating personnel who carry out the piecing process have arrived at the spinning station.
  • the end of the yarn is located at a defined location, namely preferably in the area of the yarn end discharge, and can be fixed there as required (as mentioned above).
  • the yarn end discharge can be carried out according to one or more of the features already explained, although this is not absolutely necessary.
  • the conveying speeds of the delivery device, the take-off device for drawing off the yarn from the spinning device and the winding device are gradually reduced to a standstill before the end section of the yarn to be removed is unwound.
  • the reduction is advantageously carried out in such a way that the end of the yarn produced is after the reduction has ended between the exit of the spinning station and the winding device, preferably between the exit of the spinning station and the take-off device.
  • At least a section of the yarn end discharge preferably also extends into this area.
  • the yarn end resulting from the reduction in the delivery speeds is at a defined point and after the above units have stopped can be safely captured by the yarn end discharge, e.g. B. sucked in.
  • the yarn already wound on the winding device is fed backwards until the desired end section has been taken up by the yarn end discharge.
  • the end section is then cut off and disposed of (for example via a suction system of the spinning machine connected to the suction channel). If the yarn has been continuously pinched by corresponding take-off rollers of the take-off device after the yarn has been unwound and during the removal of the end section of the yarn, the yarn end produced by the removal of the yarn end section is finally also in the area of the take-off device.
  • This yarn end can now be gripped specifically by a service robot or an operator and fed to the subsequent piecing process.
  • a valve and / or a flow switch is assigned to the suction channel and that the air pressure within the suction channel is regulated with the aid of the valve and / or the flow switch.
  • the air flow prevailing in the flow channel can thus be individually adapted. An air flow is therefore preferably only generated if removal of a yarn end section is provided. In the normal spinning process, the valve is finally closed or the flow switch is adjusted accordingly until there is no more energy-consuming air flow within the suction channel.
  • the spinning station has a take-off device for drawing off the yarn from the spinning device, the yarn end being removed between the outlet of the spinning device and the take-off device.
  • the area mentioned is generally easily accessible, so that the end of the yarn can be reliably detected by a robot or an operator and fed to the piecing process, in which the end of the yarn is connected to the fiber material coming from the delivery device before the actual spinning process is continued.
  • the end section of the yarn to be discharged is unwound from a spool of the winding device, in that at least one drive of the spool is driven counter to the winding direction prevailing during the spinning process.
  • This enables a controlled unwinding process in which loop formation or other undesirable reduction in the yarn tension can be prevented.
  • the coil can be driven directly.
  • the winding device comprises a yarn traversing device and the yarn traversing device is assigned a yarn lifting device, the yarn being removed with the help of the yarn lifting device at least during the unwinding of the end section to be removed Yarn is brought out of the knitting area of the yarn traversing device.
  • the traversing device ensures that the yarn produced is deposited on the bobbin in a known manner during the spinning process, contact between the traversing device and the yarn during the unwinding process is undesirable in order to avoid damage to the yarn and / or traversing device.
  • This can be achieved in a simple manner by the yarn lifting device mentioned in that the yarn is moved in the area of the traversing device until it is no longer in contact with the traversing device.
  • Figure 1 shows a schematic side view of a spinning station 1 of an air spinning machine (as an example of a spinning machine according to the invention) during the spinning process, the air spinning machine generally comprising a plurality of spinning stations 1 arranged one behind the other perpendicular to the plane of the drawing and preferably of a similar design.
  • the air spinning machine has in the Figure 1 Example shown via a delivery device 7 designed as a drafting system, which is supplied with a fiber material 4, for example in the form of a doubled conveyor belt. Furthermore, the spinning station 1 shown has a spinning device 2 spaced apart from the delivery device 7 with an inlet 3 for the fiber material 4 and an internal air swirl chamber, not shown.
  • the fiber material 4 or at least some of the fibers of the fiber material 4 are provided with a rotation in a known manner within the air vortex chamber in order to produce the desired yarn 6.
  • the rotation is created by a targeted air flow in the area of a spindle tip, the air flow being generated by air nozzles opening tangentially into the air swirl chamber.
  • the spinning station 1 shown comprises a take-off device 12 formed by a pair of take-off rolls and a take-up device 8 connected downstream of the take-off roll pair and having an exchangeable bobbin 20 for winding up the yarn 6 drawn out of the spinning station 1 through the outlet 5.
  • the spinning machine can be equipped with a yarn monitoring unit 21, which predefined parameters of the yarn 6 (e.g. the yarn thickness, the yarn tenacity or other representative of the quality of the yarn 6) Parameters) and / or the presence of the yarn 6 is monitored at the corresponding position.
  • the yarn monitoring unit 21 preferably works without contact.
  • the device according to the invention does not necessarily have to have a drafting system, as is shown in Figure 1 is shown.
  • the extraction roller pair is also not absolutely necessary.
  • the spinning machine according to the invention can also be designed as a rotor spinning machine, the spinning device 2 in this case comprising a rotor and the delivery device instead of the drafting device comprising a feed roller and an opening roller.
  • the figures show a winding roller 22, via which the spool 20 can be set in rotation.
  • a yarn traversing device 16 e.g. in the form of a wing traverse
  • the conveying speeds of the delivery device 7, the take-off device 12 and the Winding device 8 gradually reduced. A reduction can also take place before the spinning machine is switched off.
  • the individual conveyor speeds should be such be throttled so that the spinning process is maintained as long as possible. An uncontrolled tearing of the yarn 6 can be avoided in this way. Rather, the aim of reducing the conveying speeds is to ensure that the stable spinning process comes to a standstill by falling below defined conveying speeds and that, from a certain point in time, no more yarn 6 is produced from the fiber material 4. At this point, the desired interruption of the yarn production finally occurs, in which the yarn 6 detaches from the fiber material 4 without the application of a separate force. This can be achieved, for example, by reducing the conveying speed of the delivery device 7 to such an extent that it no longer delivers a sufficient amount of fiber material 4 in order to form a yarn 6 therefrom.
  • the pair of draw-off rollers can be operated for a short period of time until the end of the yarn 6 that has come to a definite position after the delivery device 7, the take-off device 12 and the winding device 8 have come to a standstill, as shown in FIG Figure 2 is shown.
  • the take-off device 12 or the winding device 8 In order to be able to stop the take-off device 12 or the winding device 8 at the right time, it may be advisable to equip the spinning machine with a sensor which, for example, can be integrated in the yarn monitoring unit 21 or can also be positioned at a separate location.
  • the sensor is designed to be able to detect the end of the yarn 6.
  • the take-off device 12 and the winding device 8 can be stopped either immediately or with a certain time delay with the aid of the appropriate control and / or regulating unit, so that the end of the yarn 6 finally lies between the Output 5 of the spinning station 1 and the take-off device 12 is located.
  • the spinning station 1 now has its own yarn end discharge 9.
  • this has a suction channel 11, which is connected, for example, via a flow switch 15 or else directly (not shown) to a section of a suction system 23 of the spinning machine.
  • the flow switch 15 can also be coupled to the suction device 13 of the delivery device 7, as shown in the figures. By switching the flow switch 15, it is finally possible to apply suction to the suction device 13 of the delivery device 7 in the normal spinning process, while in the course of the removal of an end section of the yarn 6 described below (e.g.
  • the suction channel 11 with the Suction system 23 is connected - with simultaneous deactivation of the suction device 13 of the delivery device 7. Additionally or alternatively, it is also possible to equip the suction channel 11 with a valve 14, with the aid of which a regulation of the air volume flow within the suction channel 11 is also possible.
  • the suction channel 11 should be pressurized as soon as the spinning process has ended and the yarn end is in a position as shown in FIG Figure 2 is shown.
  • the pair of rollers of the extraction device 12 and the bobbin 20 is driven counter to the direction of rotation prevailing in the spinning process (see rotation arrows), so that the yarn 6 is unwound again from the bobbin 20 (the take-off device 12 and the bobbin winding device 8 preferably have individual drives for this purpose in order to implement the reverse direction of rotation mentioned).
  • a yarn lifting device 17 to the yarn 6 in this area, which, for example, has a lifting element 18 extending over the width of the bobbin 20 and a pneumatic cylinder 19 connected to it features. How out Figure 2 can be seen, the yarn 6 is finally moved so far against the yarn traversing device 16 until the yarn 6 can no longer get into the effective area thereof (see Figures 2 to 4 ).
  • the yarn 6 is now unwound from the bobbin 20 until the end section of the yarn 6 which is unsuitable for a subsequent piecing process is located within the suction channel 11.
  • the length of the yarn 6 can correspond, for example, to a predetermined length, which is determined using a sensor or the number of revolutions of the bobbin 20 or the rollers of the take-off device 12. If, as described above, the yarn production is interrupted by throttling the delivery speeds, it is advisable to remove at least the section that was produced during this throttling, since its quality usually does not meet the requirements.
  • the yarn end discharge 9 is deactivated again, i. H. the valve 14 is closed, the discharge switch is adjusted in favor of the suction device 13 and / or the air flow within the suction channel 11 is interrupted by deactivating the suction system 23.
  • FIG Figures 5 and 6 Another alternative of a traversing device 16 is shown in FIG Figures 5 and 6 ,
  • the traversing device 16 has two traversing elements 24 (other designation: traversing wing) which can be rotated in the opposite direction about a common axis of rotation.
  • traversing elements 24 other designation: traversing wing
  • one of the two traversing elements 24 alternately comes into contact with the yarn and finally moves it (in relation to FIG Figure 6 ) from right to left (and vice versa) to ensure the desired traversing, ie the lateral movement of the yarn 6, which is additionally guided in its movement via a deflection element 25.
  • the traversing elements 24 are brought into a position such as that of the essentially horizontally extending traversing element 24 in Figure 6 occupies. Since contact between the yarn 6 and the traversing elements 24 is excluded in this position, there is no mutual impairment during the desired unwinding. As soon as yarn 6 is finally to be wound onto the bobbin 20 again, the traversing elements 24 rotate again in the opposite directions mentioned and again effect the desired traversing of the yarn 6.
  • the invention is not restricted to the exemplary embodiments shown. Rather, all combinations of the described individual features, as shown or described in the claims, the description and the figures and as far as a corresponding combination appears to be technically possible or sensible, are the subject of the invention.
  • the yarn lifting device as shown in the figures is not absolutely necessary.
  • the suction channel does not have to have a valve or a flow switch to be coupled to the suction system of the delivery device. Rather, a direct connection of the suction channel to a vacuum source or a corresponding flow device is possible.

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

Description

Die vorliegende Erfindung betrifft eine Spinnmaschine mit zumindest einer Spinnstelle, wobei die Spinnstelle eine Spinneinrichtung mit einem Eingang für ein Fasermaterial und einem Ausgang für das aus dem Fasermaterial in der Spinneinrichtung hergestellte Garn, eine Liefereinrichtung für die Zufuhr des Fasermaterials in die Spinneinrichtung und eine Spulvorrichtung zur Aufspulung des hergestellten Garns aufweist. Ferner wird ein Verfahren zum Entfernen eines Endabschnitts eines Garns an einer Spinnstelle einer Spinnmaschine vor einem anschließenden Anspinnvorgang offenbart, wobei die Spinnstelle eine Spinneinrichtung mit einem Eingang für ein Fasermaterial und einem Ausgang für das aus dem Fasermaterial in der Spinneinrichtung hergestellte Garn, eine Liefereinrichtung für die Zufuhr des Fasermaterials in die Spinneinrichtung und eine Spulvorrichtung zur Aufspulung des hergestellten Garns aufweist, und wobei nach einer Unterbrechung des Spinnvorgangs wenigstens der abzuführende Endabschnitt des Garns von der Spulvorrichtung abgespult wird.The present invention relates to a spinning machine with at least one spinning station, the spinning station comprising a spinning device with an inlet for a fiber material and an outlet for the yarn produced from the fiber material in the spinning device, a delivery device for feeding the fiber material into the spinning device and a winding device for Has winding of the yarn produced. Furthermore, a method for removing an end portion of a yarn at a spinning station of a spinning machine before a subsequent piecing process is disclosed, the spinning station comprising a spinning device with an inlet for a fiber material and an outlet for the yarn produced from the fiber material in the spinning device, a delivery device for the Has supply of the fiber material in the spinning device and a winding device for winding the yarn produced, and wherein after an interruption of the spinning process at least the end portion of the yarn to be removed is unwound from the winding device.

Im Verlauf des Spinnprozesses kommt es an Spinnmaschinen (z. B. an Rotor- oder Luftspinnmaschinen) immer wieder zu gewollten oder ungewollten Unterbrechungen der Garnherstellung. Die hierbei (beispielsweise im Rahmen eines Qualitätsschnitts oder eines Garnrisses) entstehenden Garnenden werden auf die sich weiterdrehende Spule einer Aufspulvorrichtung gespult. Für das folgende Wiederanspinnen des Garns muss schließlich das sich auf der Spule befindliche Garnende, z. B. mit Hilfe einer entsprechenden Saugvorrichtung, von der Spulenoberfläche gelöst werden, um es entgegen der eigentlichen Spinnrichtung erneut der Spinnstelle zuführen zu können. Ferner muss in der Regel ein bestimmter Abschnitt des Garns vor dem Wiederanspinnen entfernt werden, da das vorliegende Garnende meist nicht für den Anspinnvorgang geeignet ist. Im Ergebnis kommt es schließlich zu einer signifikanten Verzögerung des weiteren Spinnvorgangs, insbesondere, da das Auffinden des Fadens und das anschließende Entfernen des Endabschnitts meist von einem Serviceroboter vorgenommen wird, der zunächst in den Bereich der betroffenen Spinnstelle verfahren werden muss.In the course of the spinning process on spinning machines (e.g. on rotor or air spinning machines) there are repeatedly deliberate or unwanted interruptions in the yarn production. The yarn ends created here (for example as part of a quality cut or a yarn break) are wound onto the spool of a winding device that continues to rotate. For the subsequent re-spinning of the yarn, the yarn end located on the bobbin, e.g. B. with the help of an appropriate suction device, be released from the spool surface in order to be able to feed it again against the actual spinning direction of the spinning station. Further As a rule, a certain section of the yarn must be removed before re-spinning, since the yarn end in question is usually not suitable for the piecing process. As a result, there is a significant delay in the further spinning process, in particular since the location of the thread and the subsequent removal of the end section is usually carried out by a service robot, which must first be moved into the area of the affected spinning station.

Aufgabe der vorliegenden Erfindung ist es daher, eine Spinnmaschine sowie ein Verfahren zum Entfernen eines Endabschnitts eines Garns an einer Spinnmaschine vor einem anschließenden Anspinnvorgang vorzuschlagen, mit deren Hilfe die Anspinnzeiten gegenüber dem Stand der Technik verkürzt werden können.The object of the present invention is therefore to propose a spinning machine and a method for removing an end section of a yarn on a spinning machine before a subsequent piecing process, with the aid of which the piecing times can be shortened compared to the prior art.

Die Aufgabe wird gelöst durch eine Spinnmaschine sowie ein Verfahren mit den Merkmalen der unabhängigen Patentansprüche.The object is achieved by a spinning machine and a method with the features of the independent claims.

Erfindungsgemäß umfasst die Spinnstelle eine Garnendenabführung, die wenigstens teilweise zwischen dem Ausgang der Spinneinrichtung (umfassend z. B. eine Spinndüse oder einen Spinnrotor) und der Spulvorrichtung angeordnet ist, und mit deren Hilfe ein Endabschnitt des hergestellten Garns von dem restlichen Garn abtrennbar und abführbar ist. Das Entfernen des nicht für den Anspinnvorgang geeigneten Garnabschnitts kann somit direkt an der Spinnstelle durchgeführt werden, und zwar bevor ein Serviceroboter oder entsprechendes Bedienpersonal an der jeweiligen Spinnstelle eintrifft.According to the invention, the spinning station comprises a yarn end discharge which is arranged at least partially between the outlet of the spinning device (comprising, for example, a spinneret or a spinning rotor) and the winding device, and with the aid of which an end section of the yarn produced can be separated and removed from the remaining yarn , The removal of the yarn section not suitable for the piecing process can thus be carried out directly at the spinning station, specifically before a service robot or corresponding operating personnel arrives at the respective spinning station.

Kommt es zu einer Unterbrechung des Spinnprozesses, beispielsweise im Rahmen eines Qualitätsschnitts (der gezielt durchgeführt wird, wenn ein oder mehrere überwachte Garnparameter nicht dem Sollwert entsprechen) oder eines ungeplanten Garnrisses, so kann unmittelbar nach der Unterbrechung damit begonnen werden, das Garn für den anschließenden Anspinnvorgang vorzubereiten. Während es nach einem Garnriss meist notwendig sein wird, das Garnende von der Spulenoberfläche zu lösen und anschließend der Garnendenabführung (z. B. mittels separater Greifvorrichtung) zuzuführen, eröffnet die erfindungsgemäße Ausbildung der Spinnstelle insbesondere für die Durchführung eines Qualitätsschnitts enorme Vorteile. So ist es prinzipiell möglich, die Produktion des Garns nach der Detektion einer Abweichung eines vorher definierten Garnparameters langsam zu drosseln. In diesem Fall ist es denkbar, die Fördergeschwindigkeiten der Liefereinrichtung, der Spulvorrichtung und einer Abzugseinrichtung, mit der das Garn aus der Spinneinrichtung abgezogen wird, allmählich zu reduzieren. Nach einer definierten Reduzierung der jeweiligen Fördergeschwindigkeiten kommt es schließlich zu einer Unterbrechung der Garnherstellung, da die Liefergeschwindigkeiten unter entsprechende Minimalwerte, die für die Garnherstellung einzuhalten sind, fällt. Unter Qualitätsschnitt ist somit nicht zwingend ein Schneidvorgang zu verstehen. Vielmehr ist ein Abbruch des Spinnprozesses gemeint, der aufgrund von Unregelmäßigkeiten bestimmter Garnparameter eingeleitet wird.If there is an interruption in the spinning process, for example as part of a quality cut (which is carried out specifically if one or more monitored yarn parameters do not correspond to the target value) or an unplanned yarn break, the yarn can be started immediately after the interruption for the subsequent one Prepare piecing process. While it will usually be necessary after a yarn break, Detaching the yarn end from the bobbin surface and then feeding it to the yarn end discharge (e.g. by means of a separate gripping device) opens up enormous advantages for the spinning station in accordance with the invention, in particular for performing a quality cut. In principle, it is thus possible to slowly throttle the production of the yarn after the detection of a deviation in a previously defined yarn parameter. In this case, it is conceivable to gradually reduce the conveying speeds of the delivery device, the winding device and a take-off device with which the yarn is drawn off from the spinning device. After a defined reduction in the respective conveying speeds, there is finally an interruption in the yarn production, since the delivery speeds fall below the corresponding minimum values which have to be observed for the yarn production. A quality cut is therefore not necessarily a cutting process. Rather, an abort of the spinning process is meant, which is initiated due to irregularities in certain yarn parameters.

Wird schließlich, z. B. von einer außerhalb der Spinneinrichtung angeordneten Überwachungseinheit, das Passieren des Garnendes an einer bestimmten Stelle (beispielsweise am Ausgang der Spinneinrichtung) detektiert, so können die genannten Einheiten (Liefereinrichtung, Spulvorrichtung, Abzugseinrichtung) vollständig gestoppt werden. Das Garnende befindet sich nun an einer definierten Position und kann bei Bedarf, beispielsweise mit Hilfe eines Walzenpaares der Abzugseinrichtung, entsprechend fixiert werden. Erfolgt die Fixierung schließlich im Bereich der erfindungsgemäßen Garnendenabführung, so kann das Garnende zuverlässig von der Garnendenabführung erfasst werden, ohne dass weitere Handhabungsmittel notwendig sind.Finally, e.g. B. from a monitoring unit arranged outside the spinning device, the passage of the yarn end at a certain point (for example at the exit of the spinning device) is detected, the units mentioned (delivery device, winding device, take-off device) can be stopped completely. The yarn end is now at a defined position and can be fixed accordingly if necessary, for example with the aid of a pair of rollers of the take-off device. If the fixation finally takes place in the area of the yarn end discharge according to the invention, the yarn end can be reliably grasped by the yarn end discharge without additional handling means being necessary.

Im Anschluss daran wird der nicht den Vorgaben entsprechende Endabschnitt des Garns von der Aufspulvorrichtung abgespult, wobei der Endabschnitt im Fall der langsamen Drosselung der Liefergeschwindigkeiten vorzugsweise zumindest dem Abschnitt entspricht, der ab dem Beginn der Drosselung produziert wurde. Der abgespulte Endabschnitt kann schließlich von der Garnendenabführung beispielsweise aufgewickelt oder abgesaugt und schließlich abgetrennt und entsprechend (z. B. in den Bereich einer zentralen Sammelstelle) abgeführt werden.The end section of the yarn which does not meet the specifications is then unwound from the winding device, the end section in the case of slow throttling of the delivery speeds preferably corresponding at least to the section which was produced from the start of the throttling. The unwound end section can finally from the yarn end discharge, for example, wound up or suctioned off and finally separated and discharged accordingly (e.g. into the area of a central collection point).

Kommt nun ein Serviceroboter in den Bereich der Spinnstelle, so liegt bereits ein entsprechend vorbereitetes Garnende vor, das zudem an einer definierten Stelle, vorzugsweise im Bereich eines Ausgangs der Garnendenabführung, fixiert sein kann. Der Roboter muss das Garnende somit nicht - wie im Stand der Technik üblich - auf der Oberfläche der Spulvorrichtung suchen und von dieser abspulen. Ebenso entfällt das zeitaufwändige Entfernen des genannten, für den Anspinnvorgang ungeeigneten Endabschnitts des Garns durch den Roboter. Im Ergebnis kann daher die Zeit, die der Roboter für den Anspinnvorgang benötigt, signifikant verringert werden.If a service robot now comes into the area of the spinning station, there is already a correspondingly prepared yarn end, which can also be fixed at a defined point, preferably in the area of an exit of the yarn end discharge. The robot therefore does not have to search for and unwind the end of the yarn on the surface of the winding device, as is customary in the prior art. Likewise, the time-consuming removal of the end section of the yarn, which is unsuitable for the piecing process, is eliminated by the robot. As a result, the time that the robot needs for the piecing process can be significantly reduced.

Des Weiteren ist es vorteilhaft, wenn die Garnendenabführung einen Absaugkanal umfasst, über die der Endabschnitt des Garns ansaugbar und/oder der abgetrennte Endabschnitt des Garns abführbar ist. Der Absaugkanal kann mit einer zentralen Unterdruckquelle der Spinnmaschine verbunden sein. Dankbar ist selbstverständlich auch, den Absaugkanal mit einer eigenen Unterdruckquelle, beispielsweise einer Venturidüse, auszurüsten, die nur dann in Betrieb genommen wird, wenn an der jeweiligen Spinnstelle ein entsprechender Endabschnitt eines Garns zu entfernen ist.Furthermore, it is advantageous if the yarn end discharge comprises a suction channel, via which the end section of the yarn can be sucked in and / or the separated end section of the yarn can be removed. The suction channel can be connected to a central vacuum source of the spinning machine. It is of course also grateful to equip the suction channel with its own vacuum source, for example a Venturi nozzle, which is only put into operation if a corresponding end section of a yarn has to be removed at the respective spinning station.

Erfindungsgemäß ist vorgesehen, dass die Garnendenabführung eine Schneideinheit umfasst, mit deren Hilfe der abzuführende Endabschnitt vom restlichen Garn abtrennbar ist. Insbesondere, wenn die Schneideinheit in den oben genannten Absaugkanal integriert ist, erhält man eine kompakte Einheit, mit deren Hilfe der abzuführende Endabschnitt sowohl abgetrennt als auch abgeführt, d. h. entsorgt werden kann. Die Schneideinheit kann bei Bedarf in den Bereich des Endabschnitts des Garns bringbar und/oder an- bzw. abschaltbar sein.According to the invention, it is provided that the yarn end discharge comprises a cutting unit, by means of which the end section to be removed can be separated from the rest of the yarn. In particular, if the cutting unit is integrated in the above-mentioned suction channel, a compact unit is obtained, with the aid of which the end section to be removed can be both separated and removed, ie disposed of. If necessary, the cutting unit can be brought into the region of the end section of the yarn and / or can be switched on or off.

Selbstverständlich ist es auch möglich, die Garntrennvorrichtung einer Garnüberwachungseinheit ("Reiniger") einzusetzen, die bei Bedarf ebenfalls als Schneideinheit ausgebildet sein kann. Die Garntrennvorrichtung ist in diesem Fall vorzugsweise zwischen dem Absaugkanal der Garnendenabführung und der Abzugseinrichtung positioniert und überwacht vorgegebene Eigenschaften bzw. die Anwesenheit des produzierten Garns im Bereich der Garnüberwachungseinheit. Auf eine separate Schneideinrichtung innerhalb des Absaugkanals könnte in dieser Ausführungsform schließlich verzichtet werden.Of course, it is also possible to use the yarn separation device of a yarn monitoring unit ("cleaner"), which can also be designed as a cutting unit if required. In this case, the yarn separation device is preferably positioned between the suction channel of the yarn end discharge and the take-off device and monitors predetermined properties or the presence of the yarn produced in the area of the yarn monitoring unit. A separate cutting device within the suction channel could finally be dispensed with in this embodiment.

Ferner ist vorgesehen, dass die Spinnstelle eine, z. B. durch ein Abzugswalzenpaar gebildete, Abzugseinrichtung für den Abzug des Garns aus der Spinneinrichtung aufweist, wobei die Garnendenabführung zwischen dem Ausgang der Spinneinrichtung und der Abzugseinrichtung angeordnet ist. Wie bereits ausgeführt, ist es grundsätzlich möglich, die Spinnstelle für die Durchführung eines so genannten Qualitätsschnitts gezielt herunterzufahren, bis es durch die Drosselung der Liefergeschwindigkeit insbesondere der Liefereinrichtung zu einer Unterbrechung der Garnherstellung kommt. Das hierbei entstehende Garnende kann bei Bedarf zwischen den Walzen der Abzugseinrichtung fixiert werden, wobei die Fixierung, d. h. der damit verbundene Stopp der Abzugswalzen, durch einen Sensor initiiert werden kann, der das Vorhandensein eines Garns an einer definierten Stelle nach dem Ausgang der Spinneinrichtung überwacht.It is also provided that the spinning station, for. B. formed by a pair of draw-off rollers, take-off device for withdrawing the yarn from the spinning device, the yarn end discharge being arranged between the outlet of the spinning device and the take-off device. As already stated, it is fundamentally possible to specifically shut down the spinning station in order to carry out a so-called quality cut until the throttling of the delivery speed, in particular of the delivery device, leads to an interruption in the yarn production. The resulting yarn end can be fixed between the rollers of the take-off device if necessary, the fixing, i. H. the associated stopping of the take-off rollers can be initiated by a sensor which monitors the presence of a yarn at a defined point after the exit of the spinning device.

Die Abzugswalzen geben das Garnende schließlich wieder frei, bevor dieses letztendlich von der Garnendenabführung erfasst und z. B. in den genannten Absaugkanal gesaugt wird (unter entsprechender Rückwärtsdrehung der in der Spulvorrichtung gelagerten Spule). Alternativ ist es auch möglich, das Garn ständig zwischen den Abzugswalzen zu fixieren, wobei diese sich entsprechend der Drehrichtung der Spulvorrichtung ebenfalls rückwärts (d. h. entgegen ihrer Drehrichtung während des eigentlichen Spinnprozesses) drehen, so lange der Endabschnitt des Garns von der Spulvorrichtung abgespult wird. Der Vorteil hierbei liegt in der Tatsache, dass das Garnende auch dann noch von der Abzugseinrichtung an definierter Stelle fixiert wird, wenn der Endabschnitt des Garns von der Garnendenabführung abgetrennt und abgeführt wird. Der bei Bedarf eintreffende Roboter kann das Garnende schließlich vor dem eigentlichen Anspinnvorgang gezielt greifen, so dass Zeitverluste durch das Suchen des Garnendes vermieden werden können.The take-off rollers finally release the yarn end before it is finally caught by the yarn end discharge and z. B. is sucked into said suction channel (with appropriate reverse rotation of the spool mounted in the winding device). Alternatively, it is also possible to fix the yarn constantly between the take-off rollers, whereby these also turn backwards (ie counter to their direction of rotation during the actual spinning process) in accordance with the direction of rotation of the winding device, as long as the end section of the yarn is unwound from the winding device. The advantage here lies in the fact that the yarn ends even then is still fixed by the take-off device at a defined point when the end section of the yarn is separated from the yarn end discharge and removed. The robot that arrives on demand can finally grip the yarn end before the actual piecing process, so that time losses can be avoided by searching for the yarn end.

Besondere Vorteile bringt es mit sich, wenn die Spulvorrichtung und/oder die Abzugseinrichtung (jeweils) eine reversibel antreibbare Antriebseinheit aufweisen. Auch wenn es für das Abspulen des zu entfernenden Garnabschnitts ausreichend wäre, die genannten Einheiten mit einer Freilaufeinrichtung auszurüsten, ist es von Vorteil, wenn ein aktiver Antrieb entgegen der während des Spinnprozesses vorherrschenden Förderrichtung möglich ist. Auf diese Weise wird ein kontrolliertes Abspulen des Endabschnitts des Garns möglich, wobei ein undefiniertes Nachlaufen der jeweiligen Spulen vermieden werden kann.It has particular advantages if the winding device and / or the take-off device (in each case) have a reversibly drivable drive unit. Even if it would be sufficient for the unwinding of the yarn section to be removed to equip the units mentioned with a freewheel device, it is advantageous if an active drive is possible against the conveying direction prevailing during the spinning process. In this way, a controlled unwinding of the end section of the yarn is possible, whereby an undefined overrun of the respective bobbins can be avoided.

Ebenso bringt es Vorteile mit sich, wenn die Spinnmaschine eine Vielzahl von nebeneinander angeordneten Spinnstellen aufweist, wobei jede Spinnstelle eine separate Garnendenabführung umfasst. Die Spinnstellen sind dabei unabhängig voneinander, so dass stets an der Spinnstelle, an der ein Wiederanspinnen erfolgen soll, der jeweilige, für das Anspinnen ungeeignete Endabschnitt des Garns entfernt werden kann.There are also advantages if the spinning machine has a multiplicity of spinning stations arranged next to one another, each spinning station comprising a separate yarn end discharge. The spinning positions are independent of one another, so that the end section of the yarn which is unsuitable for spinning can always be removed at the spinning position at which re-spinning is to take place.

Besonders vorteilhaft ist es, wenn der Absaugkanal der Garnendenabführung mit einer Absaugeinrichtung der Liefereinrichtung verbunden ist. Derartige Absaugeinrichtungen sind beispielsweise im Bereich eines die Liefereinrichtung bildenden Streckwerks einer Luftspinnmaschine oder einer Auflösewalze einer Rotorspinnmaschine üblicherweise vorhanden und dienen der Abführung von Flusen, Staub oder anderen Verunreinigungen. Wird nun der Absaugkanal mit einer derartigen Absaugeinrichtung gekoppelt, so kann auf eine separate Absaugvorrichtung verzichtet werden. Die Verbindung zwischen dem Absaugkanal und der Absaugeinrichtung der Liefereinrichtung kann beispielsweise mittel Rohrstücken und/oder entsprechender Strömungsweichen erfolgen.It is particularly advantageous if the suction channel of the yarn end discharge is connected to a suction device of the delivery device. Such suction devices are usually present, for example, in the area of a drafting device of an air spinning machine or a disintegrating roller of a rotor spinning machine and serve to remove fluff, dust or other contaminants. If the suction channel is now coupled to such a suction device, a separate suction device can be dispensed with. The connection between the suction channel and the suction device of the delivery device can be done for example by means of pipe sections and / or corresponding flow switches.

Vorteilhaft ist es zudem, wenn dem Absaugkanal ein Ventil und/oder eine Strömungsweiche zugeordnet ist, mit deren Hilfe der Luftdruck innerhalb des Absaugkanals regulierbar ist. Der Absaugkanal kann auf diese Weise mit einer zentralen Absauganlage der Spinnmaschine gekoppelt werden. Je nachdem, ob an der jeweiligen Spinnstelle schließlich ein Entfernen des nicht zum Anspinnen geeigneten Endabschnitts des Garns notwendig ist oder nicht, wird schließlich der Absaugkanal mit einem Unterdruck bzw. einer Luftströmung beaufschlagt, was ein Einsaugen des Garnendes bewirkt. Das Ventil bzw. die Strömungsweiche wird schließlich vorteilhafterweise mit Hilfe einer entsprechenden Steuereinheit gesteuert, die wiederum beispielsweise mit einem Garnsensor in Verbindung stehen kann.It is also advantageous if a valve and / or a flow switch is assigned to the suction channel, with the aid of which the air pressure within the suction channel can be regulated. In this way, the suction channel can be coupled to a central suction system of the spinning machine. Depending on whether or not it is finally necessary to remove the end section of the yarn which is not suitable for spinning at the respective spinning position, a vacuum or air flow is finally applied to the suction channel, which causes the yarn end to be sucked in. Finally, the valve or the flow switch is advantageously controlled with the aid of a corresponding control unit, which in turn can be connected, for example, to a yarn sensor.

Auch ist es äußert vorteilhaft, wenn die Spulvorrichtung eine Garnchangiereinrichtung umfasst, wobei der Garnchangiereinrichtung eine Garnabhebevorrichtung zugeordnet ist, mit deren Hilfe das Garn aus dem Wirkbereich der Garnchangiereinrichtung bringbar ist. Durch Abheben des Garns kann auf einfache Weise verhindert werden, dass es während des Abspulvorgangs des Garnendabschnitts von der Spulvorrichtung zu einem Reißen des Garns oder einer Beschädigung der Changiereinrichtung kommt, da sich Garn und Changiereinrichtung in diesem Zeitraum nicht mehr berühren.It is also extremely advantageous if the winding device comprises a yarn traversing device, the yarn traversing device being associated with a yarn lifting device, with the aid of which the yarn can be brought out of the effective range of the yarn traversing device. By lifting the yarn, it can be prevented in a simple manner that the yarn is torn or the traversing device is damaged during the unwinding process of the yarn end section from the winding device, since the yarn and traversing device no longer touch during this period.

Auch ist es von Vorteil, wenn die Garnabhebevorrichtung ein Abhebeelement umfasst, das, vorzugsweise mit Hilfe eines Pneumatikzylinders, relativ zum Garn bewegbar ist. Das Garn verläuft schließlich über das Abhebeelement und kann daher nicht mehr mit den Changierelementen der Changiereinheit in Berührung kommen. Spätestens nachdem der Anspinnvorgang beendet ist, verfährt die Garnabhebevorrichtung, bzw. der Pneumatikzylinder, wieder in seine Ausgangsstellung, bei der die Changierelemente wieder eine Changierbewegung des Garns bewirken, während dieses von der Spulvorrichtung aufgespult wird.It is also advantageous if the yarn lifting device comprises a lifting element which can be moved relative to the yarn, preferably with the aid of a pneumatic cylinder. The yarn finally runs over the lifting element and can therefore no longer come into contact with the traversing elements of the traversing unit. At the latest after the piecing process has ended, the yarn lifting device, or the pneumatic cylinder, moves back into its starting position, in which the traversing elements again cause a traversing movement of the yarn while it is moving from the winding device is wound up.

Vorteilhaft ist es zudem, wenn sich das Abhebeelement zumindest über die Breite der Spulvorrichtung erstreckt. Dies stellt sicher, dass das Garn bei Aktivierung des Abhebeelements sicher von diesem erfasst wird. Eine Bewegung des Abhebeelements in Breitenrichtung der Spulvorrichtung (d. h. in axialer Richtung einer eingelegten Spule) ist daher nicht nötig. Das Abhebeelement kann hierbei beispielsweise stabförmig ausgebildet sein und kann mit einem entsprechenden Antriebselement, beispielsweise dem genannten Pneumatikzylinder, in Verbindung stehen.It is also advantageous if the lifting element extends at least across the width of the winding device. This ensures that the yarn is securely caught by the lifting element when it is activated. A movement of the lifting element in the width direction of the winding device (i.e. in the axial direction of an inserted bobbin) is therefore not necessary. The lifting element can be rod-shaped, for example, and can be connected to a corresponding drive element, for example the pneumatic cylinder mentioned.

Alternativ kann selbstverständlich auch vorgesehen sein, dass die zum Einsatz kommende Garnchangiereinrichtung ein oder mehrere Changierelemente (z. B. in Form eines Fadenführers) aufweist, die bei Bedarf derart verschieb-, verschwenk- oder anderweitig bewegbar sind, dass sie in eine Stellung bringbar sind, in der sie beim Abspulen des Garns (von der Spulvorrichtung) nicht mehr mit dem Garn in Berührung kommen. Beispielsweise wäre es in diesem Zusammenhang denkbar, eine so genannte Flügelchangiereinrichtung einzusetzen. Diese weist in der Regel zwei oder mehr gegenläufig rotierbare Flügelelemente auf, die abwechselnd mit dem aufzuspulenden Garn in Berührung kommen und dieses schließlich beim Aufspulen entsprechend hin- und herbewegen. Um nun zu verhindern, dass die Changierelemente während des Abspulvorgangs mit dem Garn in Berührung kommen (dies könnte den Abspulvorgang negativ beeinflussen), kann es nun vorgesehen sein, die jeweiligen Changierelemente in eine so genannte Abspulstellung zu bewegen. Die Abspulstellung ist hierbei eine Stellung, bei der das bzw. die Changierelemente nicht mehr mit dem zwischen Spulvorrichtung und Abzugsvorrichtung verlaufenden Garn in Berührung kommen können. Kommen die genannten Flügelelemente zum Einsatz, so würden diese in eine Stellung rotiert werden, bei der sich die mit dem Garn während des Aufspulens in Kontakt tretenden Abschnitte in einem Bereich befinden, der außerhalb des Garnverlaufs während des Abspulens liegt.Alternatively, it can of course also be provided that the yarn traversing device used has one or more traversing elements (e.g. in the form of a thread guide) which, if necessary, can be moved, pivoted or otherwise moved in such a way that they can be brought into a position in which they no longer come into contact with the yarn when the yarn is being unwound (from the winding device). For example, it would be conceivable in this context to use a so-called wing traversing device. This usually has two or more counter-rotating wing elements, which alternately come into contact with the yarn to be wound and finally move it back and forth accordingly when winding. In order to prevent the traversing elements from coming into contact with the yarn during the unwinding process (this could negatively influence the unwinding process), it can now be provided to move the respective traversing elements into a so-called unwinding position. The unwinding position is a position in which the traversing element or elements can no longer come into contact with the yarn running between the winding device and the take-off device. If the wing elements mentioned are used, they would be rotated into a position in which the sections which come into contact with the yarn during winding are in an area which is outside the course of the yarn during unwinding.

Das erfindungsgemäße Verfahren zum Abführen eines Endabschnitts eines Garns an einer Spinnmaschine vor einem anschließenden Anspinnvorgang zeichnet sich schließlich erfindungsgemäß dadurch aus, dass der Endabschnitt des Garns nach einer Unterbrechung des Spinnvorgangs von der Spulvorrichtung abgespult wird, und dass der Endabschnitt mit Hilfe einer als Bestandteil der Spinnstelle ausgebildeten Garnendenabführung erfasst, vom restlichen Garn abgetrennt und anschließend aus dem Bereich der Spinnstelle abgeführt wird, wobei die Garnendenabführung wenigstens teilweise zwischen dem Ausgang der Spinneinrichtung und der Spulvorrichtung angeordnet ist. Das Garn kann somit individuell an jeder Spinnstelle entsprechend bearbeitet werden, bevor ein Serviceroboter oder entsprechendes Bedienpersonal, die den Anspinnvorgang vornehmen, an der Spinnstelle eingetroffen sind. Zudem befindet sich das Garnende nach dem Entfernen des für den Anspinnvorgang ungeeigneten Endabschnitts des Garns an einer definierten Stelle, nämlich vorzugsweise im Bereich der Garnendenabführung, und kann dort bei Bedarf (wie oben erwähnt) fixiert werden. Die Garnendenabführung kann schließlich gemäß einem oder mehreren der bereits erläuterten Merkmale ausgeführt sein, wobei dies jedoch nicht zwingend notwendig ist.The method according to the invention for removing an end section of a yarn on a spinning machine before a subsequent piecing process is finally distinguished according to the invention in that the end section of the yarn is unwound from the winding device after an interruption of the spinning process, and in that the end section is used as a component of the spinning station trained yarn end removal is detected, separated from the remaining yarn and then removed from the area of the spinning station, the yarn end removal being arranged at least partially between the outlet of the spinning device and the winding device. The yarn can thus be processed individually at each spinning station before a service robot or corresponding operating personnel who carry out the piecing process have arrived at the spinning station. In addition, after the end section of the yarn which is unsuitable for the piecing process is removed, the end of the yarn is located at a defined location, namely preferably in the area of the yarn end discharge, and can be fixed there as required (as mentioned above). Finally, the yarn end discharge can be carried out according to one or more of the features already explained, although this is not absolutely necessary.

Vorteilhaft ist es insbesondere, wenn die Fördergeschwindigkeiten der Liefereinrichtung, der Abzugseinrichtung für den Abzug des Garns aus der Spinneinrichtung und der Spulvorrichtung vor dem Abspulen des abzuführenden Endabschnitts des Garns allmählich bis zu deren Stillstand reduziert werden. Die Reduzierung erfolgt vorteilhafterweise derart, dass sich das Ende des hergestellten Garns nach Abschluss der Reduzierung zwischen dem Ausgang der Spinnstelle und der Spulvorrichtung, vorzugsweise zwischen dem Ausgang der Spinnstelle und der Abzugseinrichtung, befindet. Vorzugsweise erstreckt sich auch wenigstens ein Abschnitt der Garnendenabführung (z. B. deren Absaugkanal) in diesen Bereich. Das aus der Reduzierung der Liefergeschwindigkeiten resultierende Garnende befindet sich in diesem Fall nach dem Stopp der oben genannten Einheiten an einer definierten Stelle und kann sicher von der Garnendenabführung erfasst, z. B. angesaugt, werden. Schließlich erfolgt ein Rückwärtsfördern des bereits auf der Spulvorrichtung aufgespulten Garns, bis der gewünschte Endabschnitt von der Garnendenabführung aufgenommen wurde. Anschließend erfolgt ein Abtrennen des Endabschnitts und eine Entsorgung desselben (beispielsweise über eine mit dem Absaugkanal verbundene Absauganlage der Spinnmaschine). Wurde das Garn auch nachdem Abspulen des Garns und während der Entfernung des Endabschnitts des Garns durchgängig von entsprechenden Abzugswalzen der Abzugseinrichtung geklemmt, so befindet sich das durch das Entfernen des Garnendabschnitts erzeugte Garnende schließlich ebenfalls im Bereich der Abzugseinrichtung. Dieses Garnende kann nun gezielt von einem Serviceroboter oder einer Bedienperson gegriffen und dem anschließenden Anspinnvorgang zugeführt werden.It is particularly advantageous if the conveying speeds of the delivery device, the take-off device for drawing off the yarn from the spinning device and the winding device are gradually reduced to a standstill before the end section of the yarn to be removed is unwound. The reduction is advantageously carried out in such a way that the end of the yarn produced is after the reduction has ended between the exit of the spinning station and the winding device, preferably between the exit of the spinning station and the take-off device. At least a section of the yarn end discharge (eg its suction channel) preferably also extends into this area. In this case, the yarn end resulting from the reduction in the delivery speeds is at a defined point and after the above units have stopped can be safely captured by the yarn end discharge, e.g. B. sucked in. Finally, the yarn already wound on the winding device is fed backwards until the desired end section has been taken up by the yarn end discharge. The end section is then cut off and disposed of (for example via a suction system of the spinning machine connected to the suction channel). If the yarn has been continuously pinched by corresponding take-off rollers of the take-off device after the yarn has been unwound and during the removal of the end section of the yarn, the yarn end produced by the removal of the yarn end section is finally also in the area of the take-off device. This yarn end can now be gripped specifically by a service robot or an operator and fed to the subsequent piecing process.

Vorteilhaft ist es zudem, wenn der abzuführende Endabschnitt des Garns mit Hilfe eines Absaugkanals der Garnendenabführung angesaugt und nach dem Abtrennen vom restlichen Garn abgeführt wird. Entsprechende Absaugkanäle sind von anderen Stellen entsprechender Spinnmaschinen bekannt und können durch entsprechende bauliche bzw. steuerungstechnische Vorkehrungen individuell mit Unterdruck beaufschlagt werden.It is also advantageous if the end section of the yarn to be removed is sucked in with the aid of a suction channel of the yarn end discharge and is removed from the remaining yarn after the separation. Corresponding suction channels are known from other places on corresponding spinning machines and can be individually subjected to negative pressure by means of appropriate structural or control-technical precautions.

Besonders vorteilhaft ist es, wenn dem Absaugkanal ein Ventil und/oder eine Strömungsweiche zugeordnet ist und dass mit Hilfe des Ventils und/oder der Strömungsweiche der Luftdruck innerhalb des Absaugkanals reguliert wird. Somit kann die im Strömungskanal herrschende Luftströmung individuell angepasst werden. Eine Luftströmung wird also vorzugsweise nur dann erzeugt, wenn ein Entfernen eines Garnendabschnitts vorgesehen ist. Im normalen Spinnprozess wird das Ventil schließlich geschlossen oder die Strömungsweiche entsprechend verstellt, bis keine energiezehrende Luftströmung innerhalb des Absaugkanals mehr vorherrscht.It is particularly advantageous if a valve and / or a flow switch is assigned to the suction channel and that the air pressure within the suction channel is regulated with the aid of the valve and / or the flow switch. The air flow prevailing in the flow channel can thus be individually adapted. An air flow is therefore preferably only generated if removal of a yarn end section is provided. In the normal spinning process, the valve is finally closed or the flow switch is adjusted accordingly until there is no more energy-consuming air flow within the suction channel.

Ferner ist vorgesehen, dass die Spinnstelle eine Abzugseinrichtung für den Abzug des Garns aus der Spinneinrichtung aufweist, wobei die Garnendenabführung zwischen dem Ausgang der Spinneinrichtung und der Abzugseinrichtung erfolgt. Der genannte Bereich ist in der Regel gut zugänglich, so dass das Garnende zuverlässig von einem Roboter oder einer Bedienperson erfasst und dem Anspinnvorgang zugeführt werden kann, bei dem das Garnende mit dem von der Liefereinrichtung kommenden Fasermaterial verbunden wird, bevor der eigentliche Spinnprozess fortgesetzt wird.It is further provided that the spinning station has a take-off device for drawing off the yarn from the spinning device, the yarn end being removed between the outlet of the spinning device and the take-off device. The area mentioned is generally easily accessible, so that the end of the yarn can be reliably detected by a robot or an operator and fed to the piecing process, in which the end of the yarn is connected to the fiber material coming from the delivery device before the actual spinning process is continued.

Vorteile bringt es zudem mit sich, wenn das Garn nach dem Abtrennen des Endabschnitts des Garns mit Hilfe der Garnendenabführung und/oder der Abzugseinrichtung, z. B. deren Abzugswalzenpaar, fixiert wird, bis es manuell oder mit Hilfe eines Serviceroboters übernommen und einem Anspinnvorgang zugeführt wird. Ein Suchen des Garnendes kann in diesem Fall entfallen, so dass die für den Anspinnvorgang notwendige Zeit weiter minimiert werden kann.It also has advantages if, after the end section of the yarn has been cut off, the yarn is removed using the yarn end discharge and / or the take-off device, for. B. their take-off roller pair is fixed until it is taken over manually or with the help of a service robot and fed to a piecing process. In this case, there is no need to search for the yarn end, so that the time required for the piecing process can be further minimized.

Ebenso bringt es Vorteile mit sich, wenn der abzuführende Endabschnitt des Garns von einer Spule der Spulvorrichtung abgespult wird, indem zumindest ein Antrieb der Spule entgegen der während des Spinnprozesses vorherrschenden Aufspulrichtung angetrieben wird. Hierdurch wird ein kontrollierter Abspulvorgang möglich, bei dem eine Schlingenbildung oder eine sonstige unerwünschte Reduzierung der Garnspannung verhindert werden kann. Hierbei kann beispielsweise die Spule direkt angetrieben werden. Denkbar ist selbstverständlich auch der Antrieb über eine entsprechende Wickelwalze, die an der Oberfläche der Spule anliegt und für einen indirekten Antrieb sorgt.There are also advantages if the end section of the yarn to be discharged is unwound from a spool of the winding device, in that at least one drive of the spool is driven counter to the winding direction prevailing during the spinning process. This enables a controlled unwinding process in which loop formation or other undesirable reduction in the yarn tension can be prevented. Here, for example, the coil can be driven directly. Of course, it is also conceivable to drive via a corresponding winding roller which rests on the surface of the coil and ensures an indirect drive.

Auch ist es äußert vorteilhaft, wenn die Spulvorrichtung eine Garnchangiereinrichtung umfasst und der Garnchangiereinrichtung eine Garnabhebevorrichtung zugeordnet ist, wobei das Garn mit Hilfe der Garnabhebevorrichtung zumindest während des Abspulens des abzuführenden Endabschnitts des Garns aus dem Wirkbereich der Garnchangiereinrichtung gebracht wird. Während die Changiereinrichtung während des Spinnprozesses dafür sorgt, dass das hergestellt Garn in bekannter Weise auf dem Spulenkörper abgelegt wird, ist ein Kontakt zwischen Changiereinrichtung und Garn während des Abspulvorgangs unerwünscht, um eine Beschädigung von Garn und/oder Changiereinrichtung zu vermeiden. Dies kann durch die genannte Garnabhebevorrichtung auf einfache Weise dadurch erzielt werden, dass das Garn im Bereich der Changiereinrichtung so weit bewegt wird, bis es keinen Kontakt mehr mit der Changiereinrichtung aufweist.It is also extremely advantageous if the winding device comprises a yarn traversing device and the yarn traversing device is assigned a yarn lifting device, the yarn being removed with the help of the yarn lifting device at least during the unwinding of the end section to be removed Yarn is brought out of the knitting area of the yarn traversing device. While the traversing device ensures that the yarn produced is deposited on the bobbin in a known manner during the spinning process, contact between the traversing device and the yarn during the unwinding process is undesirable in order to avoid damage to the yarn and / or traversing device. This can be achieved in a simple manner by the yarn lifting device mentioned in that the yarn is moved in the area of the traversing device until it is no longer in contact with the traversing device.

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

Figur 1
eine schematische Seitenansicht einer erfindungsgemäßen Luftspinnmaschine während des Spinnprozesses,
Figur 2
eine schematische Seitenansicht einer erfindungsgemäßen Luftspinnmaschine nach der Unterbrechung des Spinnprozesses,
Figur 3
eine schematische Seitenansicht einer erfindungsgemäßen Luftspinnmaschine während der Entfernung eines Endabschnitts des Garns,
Figur 4
eine schematische Seitenansicht einer erfindungsgemäßen Luftspinnmaschine nach der Entfernung des Endabschnitts des Garns,
Figur 5
den Aufspulbereich einer erfindungsgemäßen Spinnmaschine in einer Seitenansicht, und
Figur 6
den Bereich gemäß Figur 5 in einer Frontansicht.
Further advantages of the invention are described in the following exemplary embodiments. Show it:
Figure 1
1 shows a schematic side view of an air spinning machine according to the invention during the spinning process,
Figure 2
1 shows a schematic side view of an air spinning machine according to the invention after the interruption of the spinning process,
Figure 3
2 shows a schematic side view of an air spinning machine according to the invention during the removal of an end section of the yarn,
Figure 4
1 shows a schematic side view of an air spinning machine according to the invention after removal of the end section of the yarn,
Figure 5
the winding area of a spinning machine according to the invention in a side view, and
Figure 6
the area according to Figure 5 in a front view.

Figur 1 zeigt eine schematische Seitenansicht einer Spinnstelle 1 einer Luftspinnmaschine (als Beispiel einer erfindungsgemäßen Spinnmaschine) während des Spinnprozesses, wobei die Luftspinnmaschine in der Regel eine Vielzahl von senkrecht zur Zeichenebene hintereinander angeordneter und vorzugsweise gleichartig aufgebauter Spinnstellen 1 umfasst. Figure 1 shows a schematic side view of a spinning station 1 of an air spinning machine (as an example of a spinning machine according to the invention) during the spinning process, the air spinning machine generally comprising a plurality of spinning stations 1 arranged one behind the other perpendicular to the plane of the drawing and preferably of a similar design.

Die Luftspinnmaschine verfügt in dem in Figur 1 gezeigten Beispiel über eine als Streckwerk ausgebildete Liefereinrichtung 7, welche mit einem Fasermaterial 4, beispielsweise in Form eines doublierten Streckenbands, beliefert wird. Ferner weist die gezeigte Spinnstelle 1 eine von der Liefereinrichtung 7 beabstandete Spinneinrichtung 2 mit einem Eingang 3 für das Fasermaterial 4 und einer nicht gezeigten, innenliegenden Luftwirbelkammer auf.The air spinning machine has in the Figure 1 Example shown via a delivery device 7 designed as a drafting system, which is supplied with a fiber material 4, for example in the form of a doubled conveyor belt. Furthermore, the spinning station 1 shown has a spinning device 2 spaced apart from the delivery device 7 with an inlet 3 for the fiber material 4 and an internal air swirl chamber, not shown.

Innerhalb der Luftwirbelkammer wird schließlich das Fasermaterial 4 bzw. mindestens ein Teil der Fasern des Fasermaterials 4 zur Herstellung des gewünschten Garns 6 auf bekannte Weise mit einer Drehung versehen. Die Drehung entsteht hierbei durch eine gezielte Luftströmung im Bereich einer Spindelspitze, wobei die Luftströmung durch tangential in die Luftwirbelkammer mündende Luftdüsen erzeugt wird.Finally, the fiber material 4 or at least some of the fibers of the fiber material 4 are provided with a rotation in a known manner within the air vortex chamber in order to produce the desired yarn 6. The rotation is created by a targeted air flow in the area of a spindle tip, the air flow being generated by air nozzles opening tangentially into the air swirl chamber.

Ferner umfasst die gezeigte Spinnstelle 1 eine durch ein Abzugswalzenpaar gebildete Abzugseinrichtung 12 sowie eine dem Abzugswalzenpaar nachgeschaltete und eine auswechselbare Spule 20 aufweisende Spulvorrichtung 8 zum Aufspulen des durch den Ausgang 5 aus der Spinnstelle 1 abgezogenen Garns 6.Furthermore, the spinning station 1 shown comprises a take-off device 12 formed by a pair of take-off rolls and a take-up device 8 connected downstream of the take-off roll pair and having an exchangeable bobbin 20 for winding up the yarn 6 drawn out of the spinning station 1 through the outlet 5.

Darüber hinaus kann die Spinnmaschine mit einer Garnüberwachungseinheit 21 ausgerüstet, welche vorher definierte Parameter des Garns 6 (z. B. die Garndicke, die Garnfestigkeit oder andere für die Qualität des Garns 6 repräsentative Parameter) und/oder das Vorhandensein des Garns 6 an der entsprechenden Position überwacht. Die Garnüberwachungseinheit 21 arbeitet dabei vorzugsweise berührungslos.In addition, the spinning machine can be equipped with a yarn monitoring unit 21, which predefined parameters of the yarn 6 (e.g. the yarn thickness, the yarn tenacity or other representative of the quality of the yarn 6) Parameters) and / or the presence of the yarn 6 is monitored at the corresponding position. The yarn monitoring unit 21 preferably works without contact.

Die erfindungsgemäße Vorrichtung muss nicht zwangsweise ein Streckwerk aufweisen, wie dies in Figur 1 dargestellt ist. Auch ist das Abzugswalzenpaar nicht zwingend notwendig. Zudem kann die erfindungsgemäße Spinnmaschine auch als Rotorspinnmaschine ausgebildet sein, wobei die Spinneinrichtung 2 in diesem Fall einen Rotor und die Liefereinrichtung anstelle des Streckwerks eine Speise- und eine Auflösewalze umfasst.The device according to the invention does not necessarily have to have a drafting system, as is shown in Figure 1 is shown. The extraction roller pair is also not absolutely necessary. In addition, the spinning machine according to the invention can also be designed as a rotor spinning machine, the spinning device 2 in this case comprising a rotor and the delivery device instead of the drafting device comprising a feed roller and an opening roller.

Schließlich zeigen die Figuren neben den bereits genannten Baueinheiten eine Wickelwalze 22, über welche die Spule 20 in Drehung versetzt werden kann. Ebenso ist eine Garnchangiereinrichtung 16 (z. B. in Form eines Flügelchangierers) vorhanden, mit deren Hilfe das Garn 6 während des Aufspulens auf die Spule 20 in einer Richtung senkrecht zur Zeichenebene hin- und herbewegt wird, um ein einseitiges Aufspulen des Garns 6 zu vermeiden.Finally, in addition to the structural units already mentioned, the figures show a winding roller 22, via which the spool 20 can be set in rotation. There is also a yarn traversing device 16 (e.g. in the form of a wing traverse), with the aid of which the yarn 6 is moved back and forth in a direction perpendicular to the plane of the drawing during winding onto the bobbin 20 in order to wind the yarn 6 on one side avoid.

Die für die Erfindung wesentlichen Bauteile sowie das erfindungsgemäße Verfahren werden nun im Folgenden näher erläutert.The components essential to the invention and the method according to the invention are now explained in more detail below.

Im Fall, dass mit Hilfe der Garnüberwachungseinheit 21 (die auch an anderer Stelle positioniert sein kann) eine definierte Abweichung des oder der überwachten Garnparameter von entsprechenden Sollwerten detektiert wird oder sobald ein Spulenwechsel ansteht, werden die Fördergeschwindigkeiten der Liefereinrichtung 7, der Abzugseinrichtung 12 und der Spulvorrichtung 8 allmählich reduziert. Ebenso kann eine Reduzierung erfolgen, bevor die Spinnmaschine abgeschaltet wird.In the event that a defined deviation of the monitored yarn parameter (s) from corresponding setpoints is detected with the aid of the yarn monitoring unit 21 (or can be positioned elsewhere) or as soon as a bobbin change is pending, the conveying speeds of the delivery device 7, the take-off device 12 and the Winding device 8 gradually reduced. A reduction can also take place before the spinning machine is switched off.

Die Reduzierung muss hierbei nicht gleichzeitig oder kontinuierlich erfolgen. In jedem Fall sollten die einzelnen Fördergeschwindigkeiten jedoch derart gedrosselt werden, dass der Spinnprozess so lange wie möglich aufrechterhalten wird. Ein unkontrolliertes Reißen des Garns 6 kann auf diese Weise vermieden werden. Vielmehr ist es Ziel der Reduzierung der Fördergeschwindigkeiten, dass der stabile Spinnprozess durch Unterschreiten definierter Fördergeschwindigkeiten zum Erliegen kommt und somit ab einem gewissen Zeitpunkt kein Garn 6 mehr aus dem Fasermaterial 4 erzeugt wird. Zu diesem Zeitpunkt kommt es schließlich zur gewünschten Unterbrechung der Garnherstellung, bei der sich das Garn 6 ohne separate Krafteinwirkung von dem Fasermaterial 4 löst. Dies kann beispielsweise dadurch erreicht werden, dass die Fördergeschwindigkeit der Liefereinrichtung 7 so weit reduziert wird, dass sie keine ausreichende Menge an Fasermaterial 4 mehr liefert, um hieraus ein Garn 6 zu bilden.The reduction does not have to take place simultaneously or continuously. In any case, the individual conveyor speeds should be such be throttled so that the spinning process is maintained as long as possible. An uncontrolled tearing of the yarn 6 can be avoided in this way. Rather, the aim of reducing the conveying speeds is to ensure that the stable spinning process comes to a standstill by falling below defined conveying speeds and that, from a certain point in time, no more yarn 6 is produced from the fiber material 4. At this point, the desired interruption of the yarn production finally occurs, in which the yarn 6 detaches from the fiber material 4 without the application of a separate force. This can be achieved, for example, by reducing the conveying speed of the delivery device 7 to such an extent that it no longer delivers a sufficient amount of fiber material 4 in order to form a yarn 6 therefrom.

Nachdem die Garnherstellung abgebrochen wurde, kann das Abzugswalzenpaar einen geringen Zeitraum weiter betrieben werden, bis das entstandene Ende des Garns 6 nach dem endgültigen Stillstand der Liefereinrichtung 7, der Abzugseinrichtung 12 und der Spulvorrichtung 8 eine definierte Position einnimmt, wie sie in Figur 2 gezeigt ist.After the yarn production has been interrupted, the pair of draw-off rollers can be operated for a short period of time until the end of the yarn 6 that has come to a definite position after the delivery device 7, the take-off device 12 and the winding device 8 have come to a standstill, as shown in FIG Figure 2 is shown.

Um die Abzugseinrichtung 12 bzw. die Spulvorrichtung 8 zum richtigen Zeitpunkt stoppen zu können, kann es ratsam sein, die Spinnmaschine mit einem Sensor auszurüsten, der beispielsweise in die Garnüberwachungseinheit 21 integriert oder aber auch an separater Stelle positioniert werden kann. Der Sensor ist hierbei ausgelegt, das Ende des Garns 6 detektieren zu können. Erreicht das Ende des Garns 6 schließlich den Sensor, so kann mit Hilfe der entsprechenden Steuer- und/oder Regelungseinheit die Abzugseinrichtung 12 sowie die Spulvorrichtung 8 entweder sofort oder mit einem gewissen Zeitverzug gestoppt werden, so dass sich das Ende des Garns 6 schließlich zwischen dem Ausgang 5 der Spinnstelle 1 und der Abzugseinrichtung 12 befindet.In order to be able to stop the take-off device 12 or the winding device 8 at the right time, it may be advisable to equip the spinning machine with a sensor which, for example, can be integrated in the yarn monitoring unit 21 or can also be positioned at a separate location. The sensor is designed to be able to detect the end of the yarn 6. When the end of the yarn 6 finally reaches the sensor, the take-off device 12 and the winding device 8 can be stopped either immediately or with a certain time delay with the aid of the appropriate control and / or regulating unit, so that the end of the yarn 6 finally lies between the Output 5 of the spinning station 1 and the take-off device 12 is located.

Im Ergebnis befindet sich das für den Anspinnvorgang nötige Ende des Garns 6 nun an einer definierten Stelle zwischen dem Ausgang 5 der Spinnstelle 1 und der Spule 20 der Spulvorrichtung 8, so dass das erfindungsgemäße Verfahren gestartet werden kann, ohne dass zuvor das Ende des Garns 6, z. B. auf der Oberfläche einer Spule 20 der Spulvorrichtung 8, gesucht werden muss. Selbstverständlich wäre das erfindungsgemäße Verfahren alternativ auch unter Zuhilfenahme einer zusätzlichen Garnhandhabungsvorrichtung möglich, die das Garnende auf der Spulenoberfläche greift und in den Bereich der im Folgenden beschriebenen Garnendenabführung 9 bewegt und an diese übergibt.The result is the end of the necessary for the piecing process Yarn 6 now at a defined point between the output 5 of the spinning station 1 and the bobbin 20 of the winding device 8, so that the method according to the invention can be started without the end of the yarn 6, e.g. B. on the surface of a coil 20 of the winding device 8, must be searched. Of course, the method according to the invention would alternatively also be possible with the aid of an additional yarn handling device which grips the yarn end on the bobbin surface and moves it into the area of the yarn end discharge 9 described below and transfers it to it.

Wie aus der Zusammenschau der Figuren 1 und 2 ersichtlich, weist die Spinnstelle 1 nun eine eigene Garnendenabführung 9 auf. Diese weist im gezeigten Ausführungsbeispiel einen Absaugkanal 11 auf, der beispielsweise über eine Strömungsweiche 15 oder aber auch direkt (nicht gezeigt) mit einem Abschnitt einer Absauganlage 23 der Spinnmaschine in Verbindung steht. Die Strömungsweiche 15 kann ferner mit der Absaugeinrichtung 13 der Liefereinrichtung 7 gekoppelt werden, wie dies in den Figuren gezeigt ist. Durch Umschalten der Strömungsweiche 15 ist es schließlich möglich, im normalen Spinnprozess die Absaugeinrichtung 13 der Liefereinrichtung 7 mit Unterdruck zu beaufschlagen, während im Verlauf des nachfolgend beschriebenen Entfernens eines Endabschnitts des Garns 6 (z. B. nach einem Qualitätsschnitt) der Absaugkanal 11 mit der Absauganlage 23 in Verbindung steht - bei gleichzeitiger Deaktivierung der Absaugeinrichtung 13 der Liefereinrichtung 7. Zusätzlich oder alternativ ist es ebenso möglich, den Absaugkanal 11 mit einem Ventil 14 auszurüsten, mit dessen Hilfe ebenfalls eine Regelung des Luftvolumenstroms innerhalb des Absaugkanals 11 möglich ist.As if looking at the Figures 1 and 2 can be seen, the spinning station 1 now has its own yarn end discharge 9. In the exemplary embodiment shown, this has a suction channel 11, which is connected, for example, via a flow switch 15 or else directly (not shown) to a section of a suction system 23 of the spinning machine. The flow switch 15 can also be coupled to the suction device 13 of the delivery device 7, as shown in the figures. By switching the flow switch 15, it is finally possible to apply suction to the suction device 13 of the delivery device 7 in the normal spinning process, while in the course of the removal of an end section of the yarn 6 described below (e.g. after a quality cut) the suction channel 11 with the Suction system 23 is connected - with simultaneous deactivation of the suction device 13 of the delivery device 7. Additionally or alternatively, it is also possible to equip the suction channel 11 with a valve 14, with the aid of which a regulation of the air volume flow within the suction channel 11 is also possible.

In jedem Fall sollte der Absaugkanal 11 mit Unterdruck beaufschlagt werden, sobald der Spinnprozess beendet wurde und sich das Garnende in einer Position befindet, wie sie in Figur 2 dargestellt ist. Gleichzeitig oder zeitlich nachgeschaltet wird nun das Walzenpaar der Abzugseinrichtung 12 sowie die Spule 20 entgegen der beim Spinnprozess vorherrschenden Drehrichtung angetrieben (siehe Drehpfeile), so dass das Garn 6 wieder von der Spule 20 abgespult wird (die Abzugseinrichtung 12 und die Spulvorrichtung 8 weisen hierfür vorzugsweise Einzelantriebe auf, um die genannte Drehrichtungsumkehr zu realisieren).In any case, the suction channel 11 should be pressurized as soon as the spinning process has ended and the yarn end is in a position as shown in FIG Figure 2 is shown. At the same time or in time, the pair of rollers of the extraction device 12 and the bobbin 20 is driven counter to the direction of rotation prevailing in the spinning process (see rotation arrows), so that the yarn 6 is unwound again from the bobbin 20 (the take-off device 12 and the bobbin winding device 8 preferably have individual drives for this purpose in order to implement the reverse direction of rotation mentioned).

Um eine Kollision des Garns 6 mit der Garnchangiereinrichtung 16 zu verhindern, ist es darüber hinaus zweckmäßig, dem Garn 6 in diesem Bereich eine Garnabhebevorrichtung 17 zuzuordnen, die beispielsweise über ein sich über die Breite der Spule 20 erstreckendes Abhebeelement 18 und einen damit verbundenen Pneumatikzylinder 19 verfügt. Wie aus Figur 2 ersichtlich, wird das Garn 6 schließlich so weit entgegen der Garnchangiereinrichtung 16 bewegt, bis das Garn 6 nicht mehr in den Wirkbereich derselben gelangen kann (siehe Figuren 2 bis 4).In order to prevent a collision of the yarn 6 with the yarn traversing device 16, it is also expedient to assign a yarn lifting device 17 to the yarn 6 in this area, which, for example, has a lifting element 18 extending over the width of the bobbin 20 and a pneumatic cylinder 19 connected to it features. How out Figure 2 can be seen, the yarn 6 is finally moved so far against the yarn traversing device 16 until the yarn 6 can no longer get into the effective area thereof (see Figures 2 to 4 ).

Das Garn 6 wird nun so weit von der Spule 20 abgespult, bis sich der für einen späteren Anspinnvorgang ungeeignete Endabschnitt des Garns 6 innerhalb des Absaugkanals 11 befindet. Die Länge des Garns 6 kann hierbei beispielsweise einer vorher festgelegten Länge entsprechen, die mit einem Sensor oder über die Umdrehungsanzahl der Spule 20 bzw. der Walzen der Abzugseinrichtung 12 ermittelt wird. Wird die Garnherstellung, wie oben beschrieben, durch Drosselung der Liefergeschwindigkeiten unterbrochen, so bietet es sich an, wenigstens den Abschnitt, der während dieser Drosselung produziert wurde, zu entfernen, da dessen Qualität meist nicht den Forderungen entspricht.The yarn 6 is now unwound from the bobbin 20 until the end section of the yarn 6 which is unsuitable for a subsequent piecing process is located within the suction channel 11. The length of the yarn 6 can correspond, for example, to a predetermined length, which is determined using a sensor or the number of revolutions of the bobbin 20 or the rollers of the take-off device 12. If, as described above, the yarn production is interrupted by throttling the delivery speeds, it is advisable to remove at least the section that was produced during this throttling, since its quality usually does not meet the requirements.

Den Verlauf des Garns 6 nach dem Ansaugen des genannten Endabschnitts zeigt schließlich Figur 3. Wurde der gesamte abzuführende Abschnitt in den Absaugkanal 11 eingesaugt, so erfolgt ein Abtrennen dieses Abschnitts. Dies wird mit Hilfe einer Schneideinheit 10 realisiert, die beispielsweise in den Absaugkanal 11 integriert sein kann und mit deren Hilfe das abzuführende Garnende vom restlichen Garn 6 abgeschnitten wird.Finally, the course of the yarn 6 after the said end section has been sucked in is shown Figure 3 , If the entire section to be removed has been sucked into the suction channel 11, this section is separated. This is realized with the aid of a cutting unit 10, which can be integrated, for example, into the suction channel 11 and with the aid of which the yarn end to be removed is cut off from the remaining yarn 6.

Nach dem Abtrennen des Endabschnitts des Garns 6 wird die Garnendenabführung 9 wieder deaktiviert, d. h. das Ventil 14 wird geschlossen, die Abzugsweiche zugunsten der Absaugeinrichtung 13 verstellt und/oder die Luftströmung innerhalb des Absaugkanals 11 durch Deaktivierung der Absauganlage 23 unterbrochen.After the end section of the yarn 6 has been cut off, the yarn end discharge 9 is deactivated again, i. H. the valve 14 is closed, the discharge switch is adjusted in favor of the suction device 13 and / or the air flow within the suction channel 11 is interrupted by deactivating the suction system 23.

Für den abschließenden Anspinnvorgang wird das nun entsprechend Figur 4 weiterhin durch die Abzugseinrichtung 12 fixierte und von der Garnendenabführung 9 wieder freigegebene Garnende mit Hilfe eines Serviceroboters, einer spinnstelleneigenen Garnhandhabungseinrichtung oder auch manuell gegriffen und beispielsweise entgegen der eigentlichen Spinnrichtung in die Spinnstelle 1, zwischen den Eingang 3 der Spinnstelle 1 und der Liefereinrichtung 7 oder zwischen benachbarte Walzenpaare der Liefereinrichtung 7 verschoben. Dort wird es schließlich mit dem Fasermaterial 4 in Kontakt gebracht und wieder in die Spinnstelle 1 eingeführt. Der Spinnvorgang beginnt von neuem.For the final piecing process, this is now the case Figure 4 further fixed by the take-off device 12 and released again from the yarn end discharge 9 with the help of a service robot, a spinning station's own yarn handling device or manually and for example against the actual spinning direction into the spinning station 1, between the entrance 3 of the spinning station 1 and the delivery device 7 or between Adjacent pairs of rollers of the delivery device 7 shifted. There it is finally brought into contact with the fiber material 4 and reintroduced into the spinning station 1. The spinning process starts again.

Eine weitere Alternative einer Changiereinrichtung 16 zeigen die Figuren 5 und 6. Die Changiereinrichtung 16 weist im gezeigten Fall zwei in entgegengesetzte Richtung um eine gemeinsame Drehachse rotierbare Changierelemente 24 (andere Bezeichnung: Changierflügel) auf. Während des Aufspulens des Garns 6 auf die Spule 20 der Spulvorrichtung 8 kommt abwechselnd jeweils eines der beiden Changierelemente 24 mit dem Garn in Kontakt und bewegt es schließlich (bezogen auf Figur 6) von rechts nach links (und umgekehrt), um die gewünschte Changierung, d. h. die seitliche Bewegung des Garns 6, zu gewährleisten, das zusätzlich über ein Ablenkelement 25 in seiner Bewegung geführt wird.Another alternative of a traversing device 16 is shown in FIG Figures 5 and 6 , In the case shown, the traversing device 16 has two traversing elements 24 (other designation: traversing wing) which can be rotated in the opposite direction about a common axis of rotation. During the winding of the yarn 6 onto the bobbin 20 of the winding device 8, one of the two traversing elements 24 alternately comes into contact with the yarn and finally moves it (in relation to FIG Figure 6 ) from right to left (and vice versa) to ensure the desired traversing, ie the lateral movement of the yarn 6, which is additionally guided in its movement via a deflection element 25.

Soll nun vor einem Wiederansetzen ein Teil des bereits auf die Spule 20 aufgespulten Garns 6 wieder abgespult werden (wie oben beschrieben), so ist es von Vorteil, wenn die Changierelemente 24 in eine Stellung gebracht werden, wie sie beispielsweise das im Wesentlichen horizontal verlaufende Changierelement 24 in Figur 6 einnimmt. Da nämlich in dieser Stellung ein Kontakt zwischen dem Garn 6 und den Changierelementen 24 ausgeschlossen ist, kommt es auch zu keiner gegenseitigen Beeinträchtigung während des gewünschten Abspulens. Sobald schließlich erneut Garn 6 auf die Spule 20 aufgespult werden soll, rotieren die Changierelements 24 wieder in die genannte entgegengesetzten Richtungen und bewirken wieder das gewünschte Changieren des Garns 6.If a part of the yarn 6 which has already been wound onto the bobbin 20 is to be unwound again before reattaching (as described above), then it is advantageous if the traversing elements 24 are brought into a position such as that of the essentially horizontally extending traversing element 24 in Figure 6 occupies. Since contact between the yarn 6 and the traversing elements 24 is excluded in this position, there is no mutual impairment during the desired unwinding. As soon as yarn 6 is finally to be wound onto the bobbin 20 again, the traversing elements 24 rotate again in the opposite directions mentioned and again effect the desired traversing of the yarn 6.

Im Übrigen ist die Erfindung nicht auf die dargestellten Ausführungsbeispiele beschränkt. Vielmehr sind sämtliche Kombinationen der beschriebenen Einzelmerkmale, wie sie in den Ansprüchen, der Beschreibung sowie den Figuren gezeigt oder beschrieben sind und soweit eine entsprechende Kombination technisch möglich bzw. sinnvoll erscheint, Gegenstand der Erfindung. So ist die Garnabhebevorrichtung, wie sie in den Figuren gezeigt ist, in Abhängigkeit der verwendeten Garnchangiereinrichtung nicht zwingend notwendig. Auch muss der Absaugkanal nicht über ein Ventil verfügen oder über eine Strömungsweiche mit der Absauganlage der Liefereinrichtung gekoppelt sein. Vielmehr ist eine direkte Verbindung des Absaugkanals mit einer Unterdruckquelle oder einer entsprechenden Strömungseinrichtung möglich.Otherwise, the invention is not restricted to the exemplary embodiments shown. Rather, all combinations of the described individual features, as shown or described in the claims, the description and the figures and as far as a corresponding combination appears to be technically possible or sensible, are the subject of the invention. Depending on the yarn traversing device used, the yarn lifting device as shown in the figures is not absolutely necessary. Also, the suction channel does not have to have a valve or a flow switch to be coupled to the suction system of the delivery device. Rather, a direct connection of the suction channel to a vacuum source or a corresponding flow device is possible.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Spinnstellespinning unit
22
Spinneinrichtungspinner
33
Eingangentrance
44
Fasermaterialfiber material
55
Ausgangoutput
66
Garnyarn
77
LiefereinrichtungSupply means
88th
Spulvorrichtungspooling device
99
GarnendenabführungYarn ends transfer
1010
Schneideinheitcutting unit
1111
Absaugkanalsuction
1212
Abzugseinrichtungoff device
1313
Absaugeinrichtungsuction
1414
VentilValve
1515
Strömungsweicheflow switch
1616
GarnchangiereinrichtungGarnchangiereinrichtung
1717
GarnabhebevorrichtungGarnabhebevorrichtung
1818
Abhebeelementlifting element
1919
Pneumatikzylinderpneumatic cylinder
2020
SpuleKitchen sink
2121
GarnüberwachungseinheitGarnüberwachungseinheit
2222
Wickelwalzewinding roller
2323
Absauganlageextraction
2424
ChangierelementTraversing element
2525
Ablenkelementdeflector

Claims (13)

  1. A spinning machine having at least one spinning station (1), the spinning station (1) comprising a spinning device (2) having an inlet (3) for a fiber material (4) and an outlet (5) for the yarn (6) produced from the fiber material (4) in the spinning device (2), a delivery device (7) for feeding the fiber material (4) into the spinning device (2), and a winding device (8) for winding up the produced yarn (6), and the spinning station (1) comprising a yarn end discharge (9) disposed at least partially between the outlet (5) of the spinning device (2) and the winding device (8), by means of which an end segment of the produced yarn (6) can be cut off from the remaining yarn (6) and discharged, wherein the spinning station (1) comprises a draw-off device (12) for drawing off the yarn (6) out of the spinning device (2), wherein the yarn end discharge (9) is disposed between the outlet (5) of the spinning device (2) and the draw-off device (12) characterized in that the yarn end discharge (9) comprises a cutting unit (10) by means of which the end segment to be discharged can be cut off from the remaining yarn (6).
  2. The spinning machine according to the preceding claim, characterized in that the yarn end discharge (9) comprises a suction duct (11) by means of which the end segment of the yarn (6) can be suctioned and/or the cut-off end segment of the yarn (6) can be discharged.
  3. The spinning machine according to claim 2, characterized in that the spinning machine comprises a yarn monitoring device (21) for monitoring physical properties of the yarn (6), wherein the yarn monitoring device (21) comprises a yarn cutting device, and that the yarn monitoring device (21) extends at least partially between the draw-off device (12) and the suction duct (11) of the yarn end discharge (9).
  4. The spinning machine according to any one or more of the preceding claims, characterized in that the winding device (8) and/or the draw-off device (12) comprises a reversibly driven drive unit.
  5. The spinning machine according to any one or more of the preceding claims, characterized in that the spinning machine comprises a plurality of spinning stations (1) disposed adjacent to each other, wherein each spinning station (1) comprises a separate yarn end discharge (9).
  6. The spinning machine according to any one or more of the claims 2 through 5, characterized in that the suction duct (11) of the yarn end discharge (9) is connected to a suction device (13) of the delivery device (7) and/or that a valve (14) and/or a flow deflector (15) is associated with the suction duct (11), by means of which the air pressure within the suction duct (11) can be regulated.
  7. The spinning machine according to any one or more of the preceding claims, characterized in that the winding device (8) comprises a yarn traversing device (16) and that a yarn lifting device (17) is associated with the yarn traversing device (16), by means of which the yarn (6) can be brought out of the region of effect of the yarn traversing device (16), wherein the yarn lifting device (17) preferably comprises a lifting element (18) displaceable relative to the yarn (6), preferably by means of a pneumatic cylinder (19), and/or preferably extends at least across the width of the winding device (8).
  8. The spinning machine according to any one or more of the preceding claims, characterized in that the winding device (8) comprises a yarn traversing device (16), wherein the yarn traversing device (16) comprises at least one traversing element (24) that can be brought into contact with the yarn (6) and can be brought into a position during unwinding of the yarn (6) from the winding device (8) in which said element does not contact the yarn.
  9. A method for removing an end segment of a yarn (6) at a spinning station (1) of a spinning machine before a subsequent piecing process, the spinning station (1) comprising a spinning device (2) having an inlet (3) for a fiber material (4) and an outlet (5) for the yarn (6) produced from the fiber material (4) in the spinning device (2), a delivery device (7) for feeding the fiber material (4) into the spinning device (2), and a winding device (8) for winding up the produced yarn (6), at least the end segment of the yarn (6) to be discharged being unwound from winding device (8) after an interruption in the spinning process, the end segment being captured by means of a yarn end discharge (9) implemented as part of the spinning station (1), cut off from the remaining yarn (6), and then discharged from the region of the spinning station (1), the yarn end discharge (9) being disposed at least partially between the outlet (5) of the spinning device (2) and the winding device (8), wherein the spinning station (1) comprises a draw-off device (12) for drawing off the yarn (6) out of the spinning device (2), wherein the yarn end discharging takes place between the outlet (5) of the spinning device (2) and the draw-off device (12) characterized in that the end segment of the yarn (6) captured by the yarn end discharge (9) is cut off from the remaining yarn (6) by a cutting unit (10) of the yarn end discharge (9).
  10. The method according to the preceding claim, characterized in that the conveying speeds of the delivery device (7), the draw-off device (12), and the winding device (8) are gradually reduced to a stop thereof before unwinding the end segment of the yarn (6) to be discharged, wherein the reducing takes place such that the end of the produced yarn (6) is present between the outlet (5) of the spinning station (1) and the winding device (8) after the reducing is complete, preferably between the outlet (5) of the spinning station (1) and the draw-off device (12).
  11. The method according to any one or more of the claims 9 and 10, characterized in that the end segment of the yarn (6) to be discharged is suctioned by means of a suction duct (11) of the yarn end discharge (9) and is discharged after being cut off from the remaining yarn (6), wherein a valve (14) and/or a flow deflector (15) is preferably associated with the suction duct (11) and the air pressure within the suction duct (11) is regulated by means of the valve (14) and/or the flow deflector (15).
  12. The method according to any one or more of the claims 9 through 11, characterized in that the yarn (6) is fixed by means of the yarn end discharge (9) and/or the draw-off device (12) after cutting off the end segment, until said yarn is captured and fed to a piecing process manually or by means of a service robot.
  13. The method according to any one or more of the claims 9 through 12, characterized in that the end segment of the yarn (6) to be discharged is unwound from a bobbin (20) of the winding device (8) in that at least one drive of the bobbin (20) is driven opposite the wind-up direction prevalent during the spinning process, and/or that the winding device (8) comprises a yarn traversing device (16) and a yarn lifting device (17) is associated with the yarn traversing device (16), wherein the yarn (6) is brought out of the region of effect of the yarn traversing device (16) by means of the yarn lifting device (17) at least during the unwinding of the end segment of the yarn (6) to be discharged.
EP12185320.4A 2011-09-21 2012-09-21 Spinning machine and method for discharging an end section of a thread on a spinning machine before a subsequent spinning procedure Active EP2573228B2 (en)

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DE102011053813A1 (en) 2013-03-21
JP2013067934A (en) 2013-04-18
BR102012023768A2 (en) 2013-08-06
EP2573228A2 (en) 2013-03-27
BR102012023768B1 (en) 2021-03-16
US8915055B2 (en) 2014-12-23
EP2573228A3 (en) 2015-04-01
US20130067879A1 (en) 2013-03-21
EP2573228B1 (en) 2016-07-06
CN103014945B (en) 2017-10-10
CN103014945A (en) 2013-04-03

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