EP3401423B1 - Method for pressing a pressure roller on a draw-off roller and draw-off device - Google Patents

Method for pressing a pressure roller on a draw-off roller and draw-off device Download PDF

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Publication number
EP3401423B1
EP3401423B1 EP18171238.1A EP18171238A EP3401423B1 EP 3401423 B1 EP3401423 B1 EP 3401423B1 EP 18171238 A EP18171238 A EP 18171238A EP 3401423 B1 EP3401423 B1 EP 3401423B1
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EP
European Patent Office
Prior art keywords
roller
draw
pressure roller
spring element
actuator
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EP18171238.1A
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German (de)
French (fr)
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EP3401423A1 (en
Inventor
Thomas Gruber
Robert Hagl
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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Publication of EP3401423A1 publication Critical patent/EP3401423A1/en
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/40—Removing running yarn from the yarn forming region, e.g. using tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H51/00—Forwarding filamentary material
    • B65H51/02—Rotary devices, e.g. with helical forwarding surfaces
    • B65H51/04—Rollers, pulleys, capstans, or intermeshing rotary elements
    • B65H51/08—Rollers, pulleys, capstans, or intermeshing rotary elements arranged to operate in groups or in co-operation with other elements
    • B65H51/10—Rollers, pulleys, capstans, or intermeshing rotary elements arranged to operate in groups or in co-operation with other elements with opposed coacting surfaces, e.g. providing nips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the present invention relates to a method for pressing a pressure roller against a take-off roller of a work station of a textile machine.
  • the pressure roller can be transferred from a working position, in which it is pressed against the take-off roller, into a piecing position, in which it is lifted off the take-off roller, and back, by means of an actuating device of the work station.
  • the invention relates to a corresponding take-off device for a work station of a textile machine.
  • Deduction devices with a drivable deduction roller and a pressure roller that can be pressed against the deduction roller have become known in various designs in the prior art.
  • a maintenance device that can be moved along the spinning machine
  • it has become known to press the pressure roller against the take-off roller by means of spring force.
  • a lever which can be actuated manually against the spring force by the maintenance device or by an operator.
  • the pressure roller is reset by the spring force after the maintenance device or the operator releases the corresponding lever again.
  • a spinning machine is, for example, in DE 199 23 047 A1 shown.
  • the DE 22 65 481 B1 also shows a pressure roller which, during operation, is pressed against the take-off roller by means of spring force.
  • An actuating device with an electromagnet is provided for lifting the pressure roller.
  • the pressure roller is also returned to the working position by spring force after the power supply to the electromagnet has been interrupted.
  • a spinning machine in which the pressure roller is pressed during operation by means of an electromagnet with a push rod against the take-off roller or is lifted from it. This makes it possible to change and adjust the pressing force.
  • Such a workstation-specific actuating device for lifting and returning the pressure roller is particularly advantageous for textile machines with individual workstation automation.
  • the DE 10 2007 024 588 A1 also describes a workplace's own actuating device, in which, according to one embodiment, the pressure roller can also be lifted and reset again by means of a double-acting actuating element such as a pneumatic cylinder.
  • the pressure roller is also pressed against the take-off roller during normal spinning operation by the pneumatic cylinder.
  • the contact pressure can be changed by changing the level of air pressure.
  • the object of the present invention is to propose a take-off device and a method for pressing a pressure roller, which enable the pressure roller to be reliably pressed against the take-off roller.
  • a pressure roller In a method for pressing a pressure roller against a take-off roller of a work station of a textile machine, the pressure roller is moved from a working position, in which it is pressed against the take-off roller, into a piecing position, in which it is lifted off the take-off roller, and back by means of an actuating device of the work station transferred.
  • a corresponding take-off device has a take-off roller and a pressure roller that can be pressed against the take-off roller. Furthermore, the take-off device has an actuating device, by means of which the pressure roller can be transferred from the working position to the piecing position and back.
  • the pressure roller is pressed against the take-off roller in its working position by a prestressed spring element.
  • the trigger device has a preloadable spring element. Since the pressure roller is now pressed against the take-off roller during operation not by means of the actuating device but by means of a prestressed spring element, it is not necessary to continuously apply compressed air or electricity to the actuating device during operation. It is thus possible to operate the extraction devices in an energy-saving manner even in the case of a machine with individual workstation automation, in which an actuating device must be provided at each work station.
  • the pressure roller is lifted from its working position into its piecing position and returned to the working position by means of the actuating device. The reset of the pressure roller in the working position can therefore be done very gently and without harmful effects on the thread.
  • the combination of the actuating device and the additional spring element enables the pressure roller to be pressed particularly reliably against the take-off roller.
  • the spring element when the pressure roller is in the working position, the spring element is subjected to a pretension by the actuating device.
  • the spring element In the case of the trigger device, the spring element is in an operative connection with the actuating device for this purpose.
  • This makes it possible to apply a pretension of a certain magnitude to the spring element in a targeted manner by means of the actuating device and thereby to generate a defined, high contact pressure force of the pressure roller on the take-off roller. Since the Contact pressure exactly corresponds to the prestressing force of the spring or is proportional to this, a constant contact pressure force can thereby be generated even when the pressure roller or the take-off roller wears out, so that the thread is always taken off under the same conditions. In this way, largely the same take-off conditions can also be created at several work stations of a textile machine.
  • the pretension or a setting parameter representing the pretension is specified for the actuating device, so that the magnitude of the pretension can also be adapted to different spinning conditions or different yarn counts and the like.
  • a setting parameter of the actuating device that represents the preload can be, for example, the travel of an element of the actuating device, the air pressure in the case of pneumatic actuation, and the like.
  • the transfer of the pressure roller from the piecing position to the working position takes place in two phases.
  • a first phase the pressure roller is brought into contact with the take-off roller by the actuating device.
  • the spring element is brought into an operative connection with the actuating device and is subjected to the pretension. This makes it possible to set the predetermined preload exactly, since the spring is only placed under preload when contact is reached between the draw-off roller and the pressure roller.
  • the operative connection between the actuating device and the spring element can be released.
  • the actuating device comprises an electric motor, in particular a stepping motor, in particular a linear stepping motor, which is moved in a displacement-controlled manner in the second phase.
  • the path-controlled process of the electric motor makes it possible to achieve the desired To achieve bias of the spring particularly accurate, since this is directly proportional to the spring deflection or the travel of the electric motor.
  • the electric motor is used both for lifting and returning the pressure roller and for pretensioning the spring element.
  • the setting parameter representing the preload is a displacement path of the electric motor, in particular a number of steps of the stepping motor.
  • the desired magnitude of the preload can be set and achieved in a particularly precise manner with a stepping motor.
  • the take-off device detects whether the pressure roller is in contact with the take-off roller and/or whether the spring element is operatively connected to the actuating device.
  • the start of the second phase of the displacement-controlled process or the pretensioning of the spring element can be determined exactly as a result.
  • the pull-off device has a corresponding detection device. It is particularly advantageous that even if the pressure roller and/or the take-off roller is worn, the same desired pretensioning force is always achieved without further adjustment work on the device, since the spring element only begins to be pretensioned when the pressure roller is in contact with the take-off roller. Because of this, the contact pressure of the pressure roller is independent of the diameter, so that the desired contact pressure can still be achieved even after the pressure roller has been ground down without any adjustment work.
  • the spring element is arranged in a tensionable sleeve which is provided between a lifting element of the electric motor and an actuating lever of the pressure roller.
  • the spring element is preferably designed as a spiral spring, but other embodiments would also be possible.
  • the element which performs an axial movement for biasing the spring element can be a transmission element connected to the electric motor, such as a connecting rod, a toothed rack, a threaded spindle or the like, or in the case of a linear motor, the runner.
  • the sleeve is connected to the lifting element so that it can be displaced in relation to its axial direction and is fixedly connected to the actuating lever.
  • the displaceability between the sleeve and the lifting element in the first phase allows the pressure roller to be moved from its piecing position into the working position and then, in the second phase, to apply the prestress to the spring element by compressing the spring element in the sleeve.
  • FIG 1 shows an overview of a work station 2 of a textile machine 1 in a schematic sectional view.
  • the textile machine 1 is presently designed as a spinning machine and has, in the usual way, a spinning element 8, here a spinning rotor, to which a fiber material 7 is fed.
  • the fiber material 7 is spun into a thread 4 in the spinning element 8 and drawn off by means of a take-off device 3 .
  • the thread 4 may also pass further elements, such as a quality sensor or a waxing device, and is finally wound onto a spool 6 by means of a winding device 5 .
  • the take-off device 3 includes, in a manner known per se, a stationary take-off roller 9 that can be driven at a take-off roller speed, as well as a pressure roller 10 that can be pressed against the take-off roller 9 and lifted off the take-off roller 9.
  • An actuating device 11 is provided for lifting the pressure roller 10 from the take-off roller 9 provided, which is shown here only schematically.
  • the pressure roller 10 is shown in its working position I in solid lines, while the piecing position II, in which the pressure roller 10 is lifted from the take-off roller 9, is indicated in broken lines.
  • FIG 2 shows a partially sectional, schematic representation of such a take-off device 3 with a take-off roller 9 and a pressure roller 10.
  • the pressure roller 10 is by means of an actuating device 11 from the take-off roller 9 withdrawable.
  • the pressure roller 10 is shown in its piecing position II, which has been lifted off the take-off roller 9.
  • the actuating device 11 is designed as an electric motor 13 and is mounted on the textile machine 1 (not shown here) at the work station 2 , which is only shown schematically and broken off here.
  • the electric motor has a lifting element 15 which, when the electric motor 13 is actuated, executes a lifting movement in the direction of the double arrow.
  • the lifting element 15 is connected to an actuating lever 16, which is rotatably mounted about a pivot point 17, and actuates the pressure roller 10 via it, ie transfers it from the working position I (see FIG 3 ) to piecing position II and back.
  • the actuating lever 16 is designed as a two-armed lever, with the pressure roller 10 being mounted on a first lever arm and the second lever arm being connected to the electric motor 13 of the actuating device 11 .
  • the actuating lever 16 it would also be conceivable to design the actuating lever 16 as a one-armed lever.
  • the lifting element 15 is connected to a spring plate 18 which is movably arranged in a sleeve 14 .
  • the sleeve 14 is in turn fixed, but rotatable according to the present example, connected to the operating lever 16 .
  • the electric motor 13 is also fixed but pivotably connected to the textile machine 1 or the work station 2 in order to allow the position changes of the individual components resulting from the lifting movement of the lifting element 15 .
  • other types of storage or connections between the motor 13, the sleeve 14 and the actuating lever 16, which allow such changes in position are also possible.
  • a spring element 12 here in the form of a spiral spring, is supported on the sleeve 14 from which can be acted upon by the spring plate 18 and the lifting element 15 of the electric motor 13 with a bias.
  • the sleeve 14 is connected to the lifting element 15 via the spring plate 18 in a displaceable manner with respect to its axial direction, which in this case corresponds to the direction of the double arrow and is determined by the central longitudinal axis of the cylindrical body of the sleeve 14 .
  • the lifting element 15 is in an extended position in which the spring plate 18 connected to the lifting element 15 is at a first distance from the electric motor 13 .
  • the transfer of the pressure roller 10 from its piecing position II back to its working position I is now based on the figure 3 described, in which the pressure roller is shown in the working position I.
  • the electric motor 13 is moved so that the lifting element 15 and the spring plate 18 connected thereto move in the direction of the electric motor 13 .
  • This movement is transmitted to the actuating lever 16 via the spring element 12 and the sleeve 14 , the pressure roller 10 being brought into contact with the take-off roller 9 .
  • the lifting element 15 is now in a retracted position, in which the spring plate 18 connected to the lifting element 15 has a second distance from the electric motor 13, which is less than the first distance.
  • the take-off device 3 detects when the pressure roller 10 has reached the surface of the take-off roller 9 .
  • the pull-off device has a corresponding detection device.
  • the detection device can be formed, for example, by a proximity switch, a contact switch or by elements of the actuating device.
  • the first phase of transferring the pressure roller into working position I is complete.
  • the spring element 12 is subjected to the pretension in the second phase.
  • the actuating device 11 for lifting and returning the pressure roller 10 With a spring element that can be subjected to a certain pretension, it is possible to precisely adjust the contact pressure of the pressure roller 10 desired at a work site 2 .
  • the pull-off device 3 shown makes it possible to set the contact pressure separately at each work station 2 of the textile machine 1, so that multi-lot occupancy of the textile machine 1 is also possible without any problems. It is also possible to take into account the circumstances at the individual work stations 2 . This is the case with wear and tear, for example the take-off roller 9 or the pressure roller 10 does not need to be readjusted, since the start of the second phase with the displacement-controlled process of the electric motor 13 is independent of the state of wear of the rollers 9, 10.
  • the pressing force of the pressure roller 10 on the take-off roller 9 is only dependent on the pretension of the spring element 12 or the specified travel of the electric motor 13 due to the described take-off device 3, it is also possible in a particularly favorable manner to set reproducible conditions at each work station 2. This means that the same contact pressure force acts on the pressure roller 10 both at the same work station 2 and at different work stations 2 of a textile machine 1 . As a result, the yarn can be produced with a particularly high quality.

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Anpressen einer Druckwalze an eine Abzugswalze einer Arbeitsstelle einer Textilmaschine. Die Druckwalze ist dabei mittels einer Betätigungseinrichtung der Arbeitsstelle aus einer Arbeitsposition, in welcher sie an die Abzugswalze angepresst ist, in eine Anspinnposition, in welcher sie von der Abzugswalze abgehoben ist, und zurück überführbar. Weiterhin betrifft die Erfindung eine entsprechende Abzugsvorrichtung für eine Arbeitsstelle einer Textilmaschine.The present invention relates to a method for pressing a pressure roller against a take-off roller of a work station of a textile machine. The pressure roller can be transferred from a working position, in which it is pressed against the take-off roller, into a piecing position, in which it is lifted off the take-off roller, and back, by means of an actuating device of the work station. Furthermore, the invention relates to a corresponding take-off device for a work station of a textile machine.

Abzugsvorrichtungen mit einer antreibbaren Abzugswalze und einer an die Abzugswalze anpressbaren Druckwalze sind im Stand der Technik in verschiedenen Ausführungen bekannt geworden. Beispielsweise ist es bei Offenendspinnmaschinen, die mittels einer entlang der Spinnmaschine verfahrbaren Wartungseinrichtung bedient werden, bekannt geworden, die Druckwalze mittels Federkraft an die Abzugswalze anzudrücken. Zum Abheben der Druckwalze von der Abzugswalze beim Anspinnen ist ein Hebel vorhanden, welcher durch die Wartungseinrichtung oder auch einen Bediener manuell gegen die Federkraft betätigt werden kann. Das Rückstellen der Druckwalze erfolgt dabei durch die Federkraft, nachdem die Wartungseinrichtung oder auch der Bediener den entsprechenden Hebel wieder freigibt. Eine solche Spinnmaschine ist beispielsweise in der DE 199 23 047 A1 gezeigt.Deduction devices with a drivable deduction roller and a pressure roller that can be pressed against the deduction roller have become known in various designs in the prior art. For example, in open-end spinning machines that are operated by means of a maintenance device that can be moved along the spinning machine, it has become known to press the pressure roller against the take-off roller by means of spring force. To lift the pressure roller from the take-off roller during piecing, there is a lever which can be actuated manually against the spring force by the maintenance device or by an operator. The pressure roller is reset by the spring force after the maintenance device or the operator releases the corresponding lever again. Such a spinning machine is, for example, in DE 199 23 047 A1 shown.

Die DE 22 65 481 B1 zeigt ebenfalls eine Druckwalze, die im Betrieb mittels Federkraft an die Abzugswalze angedrückt wird. Zum Abheben der Druckwalze ist eine Betätigungseinrichtung mit einem Elektromagneten vorgesehen. Das Zurücküberführen der Druckwalze in die Arbeitsposition erfolgt ebenfalls durch Federkraft, nachdem die Stromzufuhr zum Elektromagneten unterbrochen wurde.The DE 22 65 481 B1 also shows a pressure roller which, during operation, is pressed against the take-off roller by means of spring force. An actuating device with an electromagnet is provided for lifting the pressure roller. The pressure roller is also returned to the working position by spring force after the power supply to the electromagnet has been interrupted.

Weiterhin ist aus der DE 44 31 537 C2 eine Spinnmaschine bekannt geworden, bei welcher die Druckwalze im Betrieb mittels eines Elektromagneten mit einer Schubstange an die Abzugswalze angedrückt wird bzw. von dieser abgehoben wird. Dies ermöglicht es, die Anpresskraft zu verändern und einzustellen. Eine solche arbeitsstelleneigene Betätigungseinrichtung für das Abheben und Rückstellen der Druckwalze ist insbesondere auch für Textilmaschinen mit Einzelplatzautomation vorteilhaft.Furthermore, from the DE 44 31 537 C2 a spinning machine has become known, in which the pressure roller is pressed during operation by means of an electromagnet with a push rod against the take-off roller or is lifted from it. This makes it possible to change and adjust the pressing force. Such a workstation-specific actuating device for lifting and returning the pressure roller is particularly advantageous for textile machines with individual workstation automation.

Die DE 10 2007 024 588 A1 beschreibt ebenfalls eine arbeitsstelleneigene Betätigungseinrichtung, bei welcher nach einer Ausführung die Druckwalze ebenfalls mittels eines doppelt wirkenden Betätigungselements wie eines Pneumatikzylinders abgehoben und wieder rückgestellt werden kann. Das Andrücken der Druckwalze an die Abzugswalze während des normalen Spinnbetriebs erfolgt ebenfalls durch den Pneumatikzylinder. Die Anpresskraft kann hierbei durch die Höhe des Luftdruckes verändert werden.The DE 10 2007 024 588 A1 also describes a workplace's own actuating device, in which, according to one embodiment, the pressure roller can also be lifted and reset again by means of a double-acting actuating element such as a pneumatic cylinder. The pressure roller is also pressed against the take-off roller during normal spinning operation by the pneumatic cylinder. The contact pressure can be changed by changing the level of air pressure.

Aufgabe der vorliegenden Erfindung ist es, eine Abzugsvorrichtung sowie ein Verfahren zum Anpressen einer Druckwalze vorzuschlagen, welche eine zuverlässige Anpressung der Druckwalze an die Abzugswalze ermöglichen.The object of the present invention is to propose a take-off device and a method for pressing a pressure roller, which enable the pressure roller to be reliably pressed against the take-off roller.

Die Aufgabe wird gelöst mit den Merkmalen der unabhängigen Ansprüche.The object is solved with the features of the independent claims.

Bei einem Verfahren zum Anpressen einer Druckwalze an eine Abzugswalze einer Arbeitsstelle einer Textilmaschine wird die Druckwalze mittels einer Betätigungseinrichtung der Arbeitsstelle aus einer Arbeitsposition, in welcher sie an die Abzugswalze angepresst ist, in eine Anspinnposition, in welcher sie von der Abzugswalze abgehoben ist, und zurück überführt. Eine entsprechende Abzugsvorrichtung weist eine Abzugswalze und eine an die Abzugswalze anpressbare Druckwalze auf. Weiterhin weist die Abzugsvorrichtung eine Betätigungseinrichtung auf, mittels welcher die Druckwalze aus der Arbeitsposition in die Anspinnposition und zurück überführbar ist.In a method for pressing a pressure roller against a take-off roller of a work station of a textile machine, the pressure roller is moved from a working position, in which it is pressed against the take-off roller, into a piecing position, in which it is lifted off the take-off roller, and back by means of an actuating device of the work station transferred. A corresponding take-off device has a take-off roller and a pressure roller that can be pressed against the take-off roller. Furthermore, the take-off device has an actuating device, by means of which the pressure roller can be transferred from the working position to the piecing position and back.

Es ist nun vorgesehen, dass die Druckwalze in ihrer Arbeitsposition durch ein vorgespanntes Federelement an die Abzugswalze angepresst wird. Die Abzugsvorrichtung weist hierzu ein vorspannbares Federelement auf. Dadurch, dass nun im laufenden Betrieb das Anpressen der Druckwalze an die Abzugswalze nicht mittels der Betätigungseinrichtung, sondern mittels eines vorgespannten Federelements erfolgt, ist es nicht erforderlich, die Betätigungseinrichtung im laufenden Betrieb ständig mit Druckluft oder Strom zu beaufschlagen. Es ist somit auch bei einer Maschine mit Einzelplatzautomation, bei welcher eine Betätigungseinrichtung an jeder Arbeitsstelle vorgesehen werden muss, möglich, die Abzugsvorrichtungen energiesparend zu betreiben. Das Abheben der Druckwalze aus ihrer Arbeitsposition in ihre Anspinnposition erfolgt ebenso wie das Zurückführen in die Arbeitsposition mittels der Betätigungseinrichtung. Das Rückstellen der Druckwalze in die Arbeitsposition kann daher sehr schonend und ohne schädliche Einflüsse auf den Faden erfolgen. Durch die Kombination der Betätigungseinrichtung und des zusätzlichen Federelements kann eine besonders zuverlässige Anpressung der Druckwalze an die Abzugswalze erreicht werden.It is now provided that the pressure roller is pressed against the take-off roller in its working position by a prestressed spring element. For this purpose, the trigger device has a preloadable spring element. Since the pressure roller is now pressed against the take-off roller during operation not by means of the actuating device but by means of a prestressed spring element, it is not necessary to continuously apply compressed air or electricity to the actuating device during operation. It is thus possible to operate the extraction devices in an energy-saving manner even in the case of a machine with individual workstation automation, in which an actuating device must be provided at each work station. The pressure roller is lifted from its working position into its piecing position and returned to the working position by means of the actuating device. The reset of the pressure roller in the working position can therefore be done very gently and without harmful effects on the thread. The combination of the actuating device and the additional spring element enables the pressure roller to be pressed particularly reliably against the take-off roller.

Besonders vorteilhaft ist es dabei, wenn die Druckwalze in ihrer Arbeitsposition nur durch das vorgespannte Federelement angepresst wird, da hierdurch ein besonders energiesparender Betrieb möglich wird. Zudem ist es dadurch möglich, das Federelement so einzustellen, dass eine stets gleich bleibende Anpresskraft auch über eine längere Betriebsdauer erreicht wird.It is particularly advantageous if the pressure roller is only pressed in its working position by the prestressed spring element, since this enables particularly energy-saving operation. In addition, this makes it possible to set the spring element in such a way that a contact pressure force that always remains the same is also achieved over a longer period of operation.

Bei dem Verfahren wird in der Arbeitsposition der Druckwalze das Federelement durch die Betätigungseinrichtung mit einer Vorspannung beaufschlagt. Bei der Abzugsvorrichtung steht hierzu das Federelement in einer Wirkverbindung mit der Betätigungseinrichtung. Hierdurch ist es möglich, das Federelement mittels der Betätigungseinrichtung gezielt mit einer Vorspannung einer bestimmten Größe zu beaufschlagen und dadurch gezielt eine definiert hohe Anpresskraft der Druckwalze auf die Abzugswalze zu erzeugen. Da die Anpresskraft genau der Vorspannkraft der Feder entspricht bzw. zu dieser proportional ist, kann hierdurch auch bei Verschleiß der Druckwalze oder der Abzugswalze eine gleich bleibende Anpresskraft erzeugt werden, so dass der Fadenabzug stets unter gleichen Bedingungen erfolgt. Ebenso können hierdurch auch an mehreren Arbeitsstellen einer Textilmaschine weitgehend gleiche Abzugsbedingungen geschaffen werden.In the method, when the pressure roller is in the working position, the spring element is subjected to a pretension by the actuating device. In the case of the trigger device, the spring element is in an operative connection with the actuating device for this purpose. This makes it possible to apply a pretension of a certain magnitude to the spring element in a targeted manner by means of the actuating device and thereby to generate a defined, high contact pressure force of the pressure roller on the take-off roller. Since the Contact pressure exactly corresponds to the prestressing force of the spring or is proportional to this, a constant contact pressure force can thereby be generated even when the pressure roller or the take-off roller wears out, so that the thread is always taken off under the same conditions. In this way, largely the same take-off conditions can also be created at several work stations of a textile machine.

Besonders vorteilhaft ist es, wenn die Vorspannung oder ein die Vorspannung repräsentierender Einstellparameter der Betätigungseinrichtung dabei vorgegeben wird, so dass die Größe der Vorspannung auch an verschiedene Spinnbedingungen oder verschiedene Garnnummern und dergleichen angepasst werden kann. Ein die Vorspannung repräsentierender Einstellparameter der Betätigungseinrichtung kann dabei beispielsweise der Weg eines Elementes der Betätigungseinrichtung, der Luftdruck im Falle einer pneumatischen Betätigung und dgl. sein.It is particularly advantageous if the pretension or a setting parameter representing the pretension is specified for the actuating device, so that the magnitude of the pretension can also be adapted to different spinning conditions or different yarn counts and the like. A setting parameter of the actuating device that represents the preload can be, for example, the travel of an element of the actuating device, the air pressure in the case of pneumatic actuation, and the like.

Bei dem Verfahren ist es weiterhin vorteilhaft, wenn das Überführen der Druckwalze aus der Anspinnposition in die Arbeitsposition in zwei Phasen erfolgt. In einer ersten Phase wird dabei die Druckwalze durch die Betätigungseinrichtung in Anlage an die Abzugswalze gebracht. In der zweiten Phase wird dann das Federelement in eine Wirkverbindung mit der Betätigungseinrichtung gebracht und mit der Vorspannung beaufschlagt. Hierdurch ist es möglich, die vorgegebene Vorspannung exakt einzustellen, da die Feder erst beim Erreichen eines Kontakts zwischen der Abzugswalze und der Druckwalze unter Vorspannung gesetzt wird. Bei der Abzugsvorrichtung ist hierbei die Wirkverbindung zwischen der Betätigungseinrichtung und dem Federelement lösbar.In the method, it is also advantageous if the transfer of the pressure roller from the piecing position to the working position takes place in two phases. In a first phase, the pressure roller is brought into contact with the take-off roller by the actuating device. In the second phase, the spring element is brought into an operative connection with the actuating device and is subjected to the pretension. This makes it possible to set the predetermined preload exactly, since the spring is only placed under preload when contact is reached between the draw-off roller and the pressure roller. In the case of the trigger device, the operative connection between the actuating device and the spring element can be released.

Daneben ist es vorteilhaft, wenn die Betätigungseinrichtung einen Elektromotor, insbesondere einen Schrittmotor, insbesondere einen Linear-Schrittmotor umfasst, der in der zweiten Phase weggesteuert verfahren wird. Durch das weggesteuerte Verfahren des Elektromotors ist es möglich, die gewünschte Vorspannung der Feder besonders exakt zu erreichen, da diese direkt proportional zu dem Federweg bzw. dem Verfahrweg des Elektromotors ist. Der Elektromotor wird in diesem Falle gleichermaßen zum Abheben sowie Rückstellen der Druckwalze und zum Vorspannen des Federelements eingesetzt.In addition, it is advantageous if the actuating device comprises an electric motor, in particular a stepping motor, in particular a linear stepping motor, which is moved in a displacement-controlled manner in the second phase. The path-controlled process of the electric motor makes it possible to achieve the desired To achieve bias of the spring particularly accurate, since this is directly proportional to the spring deflection or the travel of the electric motor. In this case, the electric motor is used both for lifting and returning the pressure roller and for pretensioning the spring element.

Beinhaltet die Betätigungseinrichtung einen Elektromotor, so ist es weiterhin vorteilhaft, wenn der die Vorspannung repräsentierende Einstellparameter ein Verfahrweg des Elektromotors, insbesondere eine Schrittanzahl des Schrittmotors, ist. Die gewünschte Größe der Vorspannung kann mit einem Schrittmotor in besonders genauer Weise eingestellt und erreicht werden.If the actuating device includes an electric motor, it is also advantageous if the setting parameter representing the preload is a displacement path of the electric motor, in particular a number of steps of the stepping motor. The desired magnitude of the preload can be set and achieved in a particularly precise manner with a stepping motor.

Vorteilhaft ist es weiterhin, wenn von der Abzugsvorrichtung detektiert wird, ob die Druckwalze an der Abzugswalze anliegt und/oder ob das Federelement mit der Betätigungseinrichtung in Wirkverbindung steht. Der Beginn der zweiten Phase des weggesteuerten Verfahrens bzw. des Vorspannens des Federelementes kann hierdurch exakt ermittelt werden. Die Abzugsvorrichtung weist hierzu eine entsprechende Detektiereinrichtung auf. Besonders vorteilhaft ist es dabei, dass auch bei Verschleiß der Druckwalze und/oder der Abzugswalze ohne weitere Einstellarbeiten an der Vorrichtung stets die gleiche erwünschte Vorspannkraft erreicht wird, da das Vorspannen des Federelements erst dann beginnt, wenn die Druckwalze an der Abzugswalze anliegt. Aufgrund dessen ist die Anpresskraft der Druckwalze durchmesserunabhängig, so dass auch nach einem Überschleifen der Druckwalze ohne Einstellarbeiten noch immer die gewünschte Anpresskraft erreicht wird.It is also advantageous if the take-off device detects whether the pressure roller is in contact with the take-off roller and/or whether the spring element is operatively connected to the actuating device. The start of the second phase of the displacement-controlled process or the pretensioning of the spring element can be determined exactly as a result. For this purpose, the pull-off device has a corresponding detection device. It is particularly advantageous that even if the pressure roller and/or the take-off roller is worn, the same desired pretensioning force is always achieved without further adjustment work on the device, since the spring element only begins to be pretensioned when the pressure roller is in contact with the take-off roller. Because of this, the contact pressure of the pressure roller is independent of the diameter, so that the desired contact pressure can still be achieved even after the pressure roller has been ground down without any adjustment work.

Um die lösbare Wirkverbindung zwischen dem Federelement und der Betätigungseinrichtung, insbesondere dem Elektromotor herzustellen, ist es vorteilhaft, wenn das Federelement spannbar in einer Hülse angeordnet ist, welche zwischen einem Hubelement des Elektromotors und einem Betätigungshebel der Druckwalze vorgesehen ist. Das Federelement ist dabei vorzugsweise als Spiralfeder ausgebildet, andere Ausführungsformen wären jedoch ebenfalls möglich. Unter dem Hubelement des Elektromotors wird im Rahmen der vorliegenden Erfindung das Element verstanden, welches eine axiale Bewegung zum Vorspannen des Federelements ausführt. Es kann beispielsweise ein mit dem Elektromotor verbundenes Übertragungselement, wie eine Kurbelstange, eine Zahnstange, eine Gewindespindel oder dergleichen sein oder bei einem Linearmotor der Läufer.In order to establish the detachable operative connection between the spring element and the actuating device, in particular the electric motor, it is advantageous if the spring element is arranged in a tensionable sleeve which is provided between a lifting element of the electric motor and an actuating lever of the pressure roller. The spring element is preferably designed as a spiral spring, but other embodiments would also be possible. Under the lifting element of the electric motor is under the present invention understood the element which performs an axial movement for biasing the spring element. For example, it can be a transmission element connected to the electric motor, such as a connecting rod, a toothed rack, a threaded spindle or the like, or in the case of a linear motor, the runner.

Besonders vorteilhaft ist es dabei, wenn die Hülse bezogen auf ihre Axialrichtung verschiebbar mit dem Hubelement und fest mit dem Betätigungshebel verbunden ist. Dabei ermöglicht die Verschiebbarkeit zwischen der Hülse und dem Hubelement in der ersten Phase das Verbringen der Druckwalze aus ihrer Anspinnposition in die Arbeitsposition und anschließend durch Zusammendrücken des Federelementes in der Hülse in der zweiten Phase das Aufbringen der Vorspannung auf das Federelement. Natürlich wäre es aber ebenso möglich, die Hülse fest mit dem Hubelement und verschiebbar mit dem Betätigungshebel zu verbinden.It is particularly advantageous if the sleeve is connected to the lifting element so that it can be displaced in relation to its axial direction and is fixedly connected to the actuating lever. The displaceability between the sleeve and the lifting element in the first phase allows the pressure roller to be moved from its piecing position into the working position and then, in the second phase, to apply the prestress to the spring element by compressing the spring element in the sleeve. Of course, it would also be possible to connect the sleeve firmly to the lifting element and to move it to the actuating lever.

Weitere Vorteile der Erfindung werden anhand der nachfolgenden Ausführungsbeispiele beschrieben. Es zeigen:

Figur 1
eine schematische Schnittdarstellung einer Arbeitsstelle einer Textilmaschine in einer Übersichtsdarstellung,
Figur 2
eine schematische, teilgeschnittene Darstellung einer Abzugsvorrichtung, bei welcher die Druckwalze sich in der Anspinnposition befindet,
Figur 3
eine schematische, teilgeschnittene Darstellung der Abzugsvorrichtung der Figur 1, bei welcher sich die Druckwalze in der Arbeitsposition befindet, sowie
Figur 4
eine schematische, teilgeschnittene Darstellung der Abzugsvorrichtung der Figur 1, bei welcher die Druckwalze an die Abzugswalze angepresst wird.
Further advantages of the invention are described using the following exemplary embodiments. Show it:
figure 1
a schematic sectional view of a work station of a textile machine in an overview,
figure 2
a schematic, partially sectioned representation of a take-off device, in which the pressure roller is in the piecing position,
figure 3
a schematic, partially sectioned representation of the withdrawal device figure 1 , in which the pressure roller is in the working position, and
figure 4
a schematic, partially sectioned representation of the withdrawal device figure 1 , in which the pressure roller is pressed against the take-off roller.

Figur 1 zeigt eine Übersichtsdarstellung einer Arbeitsstelle 2 einer Textilmaschine 1 in einer schematischen Schnittdarstellung. Die Textilmaschine 1 ist vorliegend als Spinnmaschine ausgebildet und weist in üblicher Weise ein Spinnelement 8, hier einen Spinnrotor, auf, dem ein Fasermaterial 7 zugeführt wird. In dem Spinnelement 8 wird das Fasermaterial 7 zu einem Faden 4 versponnen und mittels einer Abzugsvorrichtung 3 abgezogen. Nach der Abzugsvorrichtung 3 passiert der Faden 4 gegebenenfalls noch weitere Elemente, wie einen Qualitätssensor oder eine Paraffiniereinrichtung und wird schließlich mittels einer Spulvorrichtung 5 auf eine Spule 6 aufgewickelt. figure 1 shows an overview of a work station 2 of a textile machine 1 in a schematic sectional view. The textile machine 1 is presently designed as a spinning machine and has, in the usual way, a spinning element 8, here a spinning rotor, to which a fiber material 7 is fed. The fiber material 7 is spun into a thread 4 in the spinning element 8 and drawn off by means of a take-off device 3 . Downstream of the take-off device 3 , the thread 4 may also pass further elements, such as a quality sensor or a waxing device, and is finally wound onto a spool 6 by means of a winding device 5 .

Die Abzugsvorrichtung 3 beinhaltet dabei in an sich bekannter Weise eine ortsfest gelagerte, mit einer Abzugswalzendrehzahl antreibbare Abzugswalze 9, sowie eine an die Abzugswalze 9 anpressbare und von der Abzugswalze 9 abhebbare Druckwalze 10. Zum Abheben der Druckwalze 10 von der Abzugswalze 9 ist eine Betätigungseinrichtung 11 vorgesehen, welche vorliegend lediglich schematisch dargestellt ist. Dabei ist in ausgezogenen Linien die Druckwalze 10 in ihrer Arbeitsposition I dargestellt, während im gestrichelten Linien die Anspinnposition II angedeutet ist, in welcher die Druckwalze 10 von der Abzugswalze 9 abgehoben ist. Bei derartigen Abzugsvorrichtungen 3 ist es häufig wünschenswert, die Anpresskraft der Druckwalze 10 an die Abzugswalze 9 einstellbar auszuführen, um eine Anpassung an Gegebenheiten der Arbeitsstelle 2 wie beispielsweise die Produktion verschiedener Garnnummern zu ermöglichen.The take-off device 3 includes, in a manner known per se, a stationary take-off roller 9 that can be driven at a take-off roller speed, as well as a pressure roller 10 that can be pressed against the take-off roller 9 and lifted off the take-off roller 9. An actuating device 11 is provided for lifting the pressure roller 10 from the take-off roller 9 provided, which is shown here only schematically. The pressure roller 10 is shown in its working position I in solid lines, while the piecing position II, in which the pressure roller 10 is lifted from the take-off roller 9, is indicated in broken lines. With such take-off devices 3, it is often desirable to adjust the contact pressure of the pressure roller 10 on the take-off roller 9 in order to allow adaptation to the conditions of the work station 2, such as the production of different yarn counts.

Figur 2 zeigt eine teilgeschnittene, schematische Darstellung einer solchen Abzugsvorrichtung 3 mit einer Abzugswalze 9 und einer Druckwalze 10. Die Druckwalze 10 ist mittels einer Betätigungseinrichtung 11 von der Abzugswalze 9 abhebbar. In Figur 2 ist dabei die Druckwalze 10 in ihrer von der Abzugswalze 9 abgehobenen Anspinnposition II gezeigt. Die Betätigungseinrichtung 11 ist vorliegend als Elektromotor 13 ausgeführt und an der Arbeitsstelle 2, welche hier lediglich schematisch und abgebrochen dargestellt ist, der Textilmaschine 1 (hier nicht dargestellt) gelagert. Der Elektromotor weist ein Hubelement 15 auf, welches bei Betätigung des Elektromotors 13 eine Hubbewegung in Richtung des Doppelpfeils ausführt. Das Hubelement 15 ist mit einem Betätigungshebel 16, welcher um einen Drehpunkt 17 drehbar gelagert ist, verbunden und betätigt über diesen die Druckwalze 10, d.h. überführt sie aus der Arbeitsposition I (siehe Fig. 3) in die Anspinnposition II und zurück. figure 2 shows a partially sectional, schematic representation of such a take-off device 3 with a take-off roller 9 and a pressure roller 10. The pressure roller 10 is by means of an actuating device 11 from the take-off roller 9 withdrawable. In figure 2 the pressure roller 10 is shown in its piecing position II, which has been lifted off the take-off roller 9. In the present case, the actuating device 11 is designed as an electric motor 13 and is mounted on the textile machine 1 (not shown here) at the work station 2 , which is only shown schematically and broken off here. The electric motor has a lifting element 15 which, when the electric motor 13 is actuated, executes a lifting movement in the direction of the double arrow. The lifting element 15 is connected to an actuating lever 16, which is rotatably mounted about a pivot point 17, and actuates the pressure roller 10 via it, ie transfers it from the working position I (see FIG 3 ) to piecing position II and back.

Vorliegend ist der Betätigungshebel 16 als zweiarmiger Hebel ausgeführt, wobei die Druckwalze 10 an einem ersten Hebelarm gelagert ist und der zweite Hebelarm mit dem Elektromotor 13 der Betätigungseinrichtung 11 verbunden ist. Es wäre aber natürlich auch denkbar, den Betätigungshebel 16 als einarmigen Hebel auszuführen.In the present case, the actuating lever 16 is designed as a two-armed lever, with the pressure roller 10 being mounted on a first lever arm and the second lever arm being connected to the electric motor 13 of the actuating device 11 . Of course, it would also be conceivable to design the actuating lever 16 as a one-armed lever.

Das Hubelement 15 ist dabei mit einem Federteller 18 verbunden, welcher verschieblich in einer Hülse 14 angeordnet ist. Die Hülse 14 ist wiederum fest, gemäß vorliegendem Beispiel aber drehbar, mit dem Betätigungshebel 16 verbunden. Ebenso ist nach vorliegender Darstellung auch der Elektromotor 13 fest, aber schwenkbar mit der Textilmaschine 1 bzw. der Arbeitsstelle 2 verbunden, um die sich durch die Hubbewegung des Hubelements 15 ergebenden Lageveränderungen der einzelnen Bauteile zuzulassen. Natürlich sind aber auch andere Lagerungsarten oder Verbindungen zwischen dem Motor 13, der Hülse 14 und dem Betätigungshebel 16, welche derartige Lageveränderungen zulassen, möglich.The lifting element 15 is connected to a spring plate 18 which is movably arranged in a sleeve 14 . The sleeve 14 is in turn fixed, but rotatable according to the present example, connected to the operating lever 16 . Likewise, according to the present illustration, the electric motor 13 is also fixed but pivotably connected to the textile machine 1 or the work station 2 in order to allow the position changes of the individual components resulting from the lifting movement of the lifting element 15 . Of course, other types of storage or connections between the motor 13, the sleeve 14 and the actuating lever 16, which allow such changes in position, are also possible.

Wie nun durch die teilgeschnittene Darstellung der Hülse 14 erkennbar, stützt sich an der Hülse 14 ein Federelement 12, hier in Form einer Spiralfeder, ab, welches durch den Federteller 18 und das Hubelement 15 des Elektromotors 13 mit einer Vorspannung beaufschlagbar ist. Die Hülse 14 ist dabei bezogen auf ihre Axialrichtung, die vorliegend der Richtung des Doppelpfeils entspricht und durch die Mittellängsachse des zylinderförmigen Körpers der Hülse 14 bestimmt ist, verschiebbar über den Federteller 18 mit dem Hubelement 15 verbunden.As can now be seen from the partially sectioned representation of the sleeve 14, a spring element 12, here in the form of a spiral spring, is supported on the sleeve 14 from which can be acted upon by the spring plate 18 and the lifting element 15 of the electric motor 13 with a bias. The sleeve 14 is connected to the lifting element 15 via the spring plate 18 in a displaceable manner with respect to its axial direction, which in this case corresponds to the direction of the double arrow and is determined by the central longitudinal axis of the cylindrical body of the sleeve 14 .

In der vorliegend gezeigten Anspinnposition II der Druckwalze 10 befindet sich das Hubelement 15 in einer ausgefahrenen Position, in welcher der mit dem Hubelement 15 verbundene Federteller 18 einen ersten Abstand zu dem Elektromotor 13 aufweist.In the piecing position II of the pressure roller 10 shown here, the lifting element 15 is in an extended position in which the spring plate 18 connected to the lifting element 15 is at a first distance from the electric motor 13 .

Das Überführen der Druckwalze 10 aus ihrer Anspinnposition II zurück in ihre Arbeitsposition I wird nun anhand der Figur 3 beschrieben, in welcher die Druckwalze in der Arbeitsposition I gezeigt ist. Zum Überführen der Druckwalze 10 in ihre Arbeitsposition I wird der Elektromotor 13 verfahren, so dass das Hubelement 15 sowie der damit verbundene Federteller 18 sich in Richtung des Elektromotors 13 bewegen. Diese Bewegung wird dabei über das Federelement 12 und die Hülse 14 auf den Betätigungshebel 16 übertragen, wobei die Druckwalze 10 in Anlage an die Abzugswalze 9 gebracht wird. Das Hubelement 15 befindet sich nun in einer eingefahrenen Position, in welcher der mit dem Hubelement 15 verbundene Federteller 18 einen zweiten Abstand zu dem Elektromotor 13 aufweist, welcher geringer ist als der erste Abstand. Dabei wird es durch die Abzugsvorrichtung 3 detektiert, wenn die Druckwalze 10 die Oberfläche der Abzugswalze 9 erreicht hat. Die Abzugsvorrichtung weist hierzu eine entsprechende Detektiereinrichtung auf. Die Detektiereinrichtung kann beispielsweise durch einen Näherungsschalter, einen Kontaktschalter oder auch durch Elemente der Betätigungseinrichtung gebildet sein.The transfer of the pressure roller 10 from its piecing position II back to its working position I is now based on the figure 3 described, in which the pressure roller is shown in the working position I. To transfer the pressure roller 10 to its working position I, the electric motor 13 is moved so that the lifting element 15 and the spring plate 18 connected thereto move in the direction of the electric motor 13 . This movement is transmitted to the actuating lever 16 via the spring element 12 and the sleeve 14 , the pressure roller 10 being brought into contact with the take-off roller 9 . The lifting element 15 is now in a retracted position, in which the spring plate 18 connected to the lifting element 15 has a second distance from the electric motor 13, which is less than the first distance. The take-off device 3 detects when the pressure roller 10 has reached the surface of the take-off roller 9 . For this purpose, the pull-off device has a corresponding detection device. The detection device can be formed, for example, by a proximity switch, a contact switch or by elements of the actuating device.

Nachdem die Druckwalze 10 in Anlage an die Abzugswalze 9 gebracht wurde, ist die erste Phase des Überführens der Druckwalze in die Arbeitsposition I beendet. Sobald nun das Anliegen der Druckwalze 10 an der Abzugswalze 9 detektiert ist, wird in der zweiten Phase das Federelement 12 mit der Vorspannung beaufschlagt.After the pressure roller 10 has been brought into contact with the take-off roller 9, the first phase of transferring the pressure roller into working position I is complete. As soon as the contact of the pressure roller 10 with the take-off roller 9 is detected, the spring element 12 is subjected to the pretension in the second phase.

Das Beaufschlagen des Federelements 12 mit der Vorspannung wird dabei in Figur 4 dargestellt. Wie der Figur 4 entnehmbar, bildet nun die Abzugswalze 9 einen Anschlag für die Druckwalze 10, so dass an dieser Stelle keine weitere Zustellbewegung mehr möglich ist. Ein weiteres Verfahren des Elektromotors 13 bzw. des Hubelementes 15 ist nun nur noch entgegen der Rückstellkraft des Federelementes 12 möglich. Somit wird durch das Anschlagen der Druckwalze 10 an der Abzugswalze 9 die Wirkverbindung zwischen dem Federelement 12 und der Betätigungseinrichtung 11, insbesondere dem Elektromotor 13 der Betätigungseinrichtung 11, hergestellt. Hierdurch kann nun bei einem weiteren Verfahren des Elektromotors 13 bzw. des Hubelements 15 eine Vorspannung auf das Federelement 12 aufgebracht werden. Da in dieser zweiten Phase der Elektromotor 13 weggesteuert verfahren wird, kann der Verfahrweg des Hubelements 15 und damit die Vorspannung des Federelements 12, die zu dem Verfahrweg des Hubelements 15 proportional ist, sehr exakt eingestellt werden.The loading of the spring element 12 with the preload is thereby figure 4 shown. Again figure 4 removed, the take-off roller 9 now forms a stop for the pressure roller 10, so that no further infeed movement is possible at this point. A further movement of the electric motor 13 or the lifting element 15 is now only possible against the restoring force of the spring element 12 . Thus, the operative connection between the spring element 12 and the actuating device 11, in particular the electric motor 13 of the actuating device 11, is produced by the impact of the pressure roller 10 on the take-off roller 9. As a result, a preload can now be applied to the spring element 12 in a further movement of the electric motor 13 or the lifting element 15 . Since the electric motor 13 is path-controlled in this second phase, the travel of the lifting element 15 and thus the preload of the spring element 12, which is proportional to the travel of the lifting element 15, can be adjusted very precisely.

Durch die Kombination der Betätigungseinrichtung 11 zum Abheben und Rückführen der Druckwalze 10 mit einem mit einer bestimmten Vorspannung beaufschlagbaren Federelement ist es möglich, die an einer Arbeitsstelle 2 gewünschte Anpresskraft der Druckwalze 10 exakt einzustellen. Besonders vorteilhaft ist es dabei, dass die gezeigte Abzugsvorrichtung 3 es ermöglicht, an jeder Arbeitsstelle 2 der Textilmaschine 1 die Anpresskraft gesondert einzustellen, so dass auch eine Mehrpartienbelegung der Textilmaschine 1 problemlos möglich ist. Ebenso ist es möglich, Gegebenheiten an den einzelnen Arbeitsstellen 2 Rechnung zu tragen. So ist es beispielsweise bei Verschleiß der Abzugswalze 9 oder des Druckrollers 10 nicht erforderlich, Nachstellarbeiten vorzunehmen, da der Beginn der zweiten Phase mit dem weggesteuerten Verfahren des Elektromotors 13 unabhängig von einem Verschleißzustand der Walzen 9, 10 ist. Da durch die beschriebene Abzugsvorrichtung 3 die Anpresskraft der Druckwalze 10 auf die Abzugswalze 9 nur von der Vorspannung des Federelements 12 bzw. dem vorgegebenen Weg des Elektromotors 13 abhängig ist, ist es zudem in besonders günstiger Weise möglich, reproduzierbare Verhältnisse an jeder Arbeitsstelle 2 einzustellen, das heißt, dass sowohl an der gleichen Arbeitsstelle 2 als auch an verschiedenen Arbeitsstellen 2 einer Textilmaschine 1 jeweils die gleiche Anpresskraft auf die Druckwalze 10 wirkt. Die Garnherstellung kann hierdurch mit einer besonders hohen Qualität erfolgen.By combining the actuating device 11 for lifting and returning the pressure roller 10 with a spring element that can be subjected to a certain pretension, it is possible to precisely adjust the contact pressure of the pressure roller 10 desired at a work site 2 . It is particularly advantageous that the pull-off device 3 shown makes it possible to set the contact pressure separately at each work station 2 of the textile machine 1, so that multi-lot occupancy of the textile machine 1 is also possible without any problems. It is also possible to take into account the circumstances at the individual work stations 2 . This is the case with wear and tear, for example the take-off roller 9 or the pressure roller 10 does not need to be readjusted, since the start of the second phase with the displacement-controlled process of the electric motor 13 is independent of the state of wear of the rollers 9, 10. Since the pressing force of the pressure roller 10 on the take-off roller 9 is only dependent on the pretension of the spring element 12 or the specified travel of the electric motor 13 due to the described take-off device 3, it is also possible in a particularly favorable manner to set reproducible conditions at each work station 2. this means that the same contact pressure force acts on the pressure roller 10 both at the same work station 2 and at different work stations 2 of a textile machine 1 . As a result, the yarn can be produced with a particularly high quality.

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

BezugszeichenlisteReference List

11
Textilmaschinetextile machine
22
Arbeitsstelleplace of work
33
Abzugsvorrichtungtrigger device
44
Fadenthread
55
Spulvorrichtungspooling device
66
SpuleKitchen sink
77
Fasermaterialfiber material
88th
Spinnelementspinning element
99
Abzugswalzepull-off roller
1010
Druckwalzepressure roller
1111
Betätigungseinrichtungactuating device
1212
Federelementspring element
1313
Elektromotorelectric motor
1414
Hülsesleeve
1515
Hubelementlifting element
1616
Betätigungshebeloperating lever
1717
Drehpunkt des BetätigungshebelsPivot of the operating lever
1818
Federtellerspring plate
II
Arbeitspositionworking position
IIII
Anspinnpositionpiecing position

Claims (13)

  1. A method for pressing a pressure roller (10) against a draw-off roller (9) of a workstation (2) of a textile machine (1), the pressure roller (10) can be transferred by means of an actuator (11) of the workstation (2) from a working position (I) in which said roller is pressed against the draw-off roller (9), into a piecing position (II) in which said roller is raised away from the draw-off roller (9), and transferred back again, wherein the pressure roller (10) is pressed against the draw-off roller (9) in the working position (I) by a pre-tensioned spring element (12) characterized in that in the working position (I) of the pressure roller (10), the spring element (12) is pretensioned by the actuator (11), whereby the spring element (12) is operatively connected to the actuator (11).
  2. The method according to the preceding claim, characterized in that the magnitude of the pretension or a setting parameter of the actuator (11) representing the pretension is predetermined.
  3. The method according to any one of the preceding claims, characterized in that transferring the pressure roller (10) from the piecing position (II) into the working position (I) takes place in two phases, wherein in a first phase the pressure roller (10) is brought into contact with the draw-off roller (9) by the actuator (11), and in a second phase the spring element (12) is brought into the operation connection with the actuator (11) by impacting the pressure roller (10) against the draw-off roller (9), and the pretension is applied to the spring element (12).
  4. The method according to the preceding claim, characterized in that the actuator (11) comprises an electric motor (13), particularly a stepper motor, particularly a linear stepper motor, operated under path control in the second phase.
  5. The method according to the claim 4, characterized in that the adjustment parameter representing the pretension is a travel distance of the electric motor (13), particularly a step count of the stepper motor.
  6. The method according to any one of the claims 3 through 5, characterized in that it is detected whether the pressure roller (10) is in contact with the draw-off roller (9) and/or whether the spring element (12) is operationally connected to the actuator (11).
  7. A draw-off device (3) for a workstation (2) of a textile machine (1), particularly for performing the method according to any one of the preceding claims, having a draw-off roller (9) and a pressure roller (10) for pressing against the draw-off roller (9), and having an actuator (11) by means of which the pressure roller (10) can be transferred from a working position (I) in which said roller (10) is pressed against the draw-off roller (9) into a piecing position (II) in which said roller (10) is lifted away from the draw-off roller (9), and transferred back again, wherein the draw-off device (3) comprises a pretensionable spring element (12) for pressing the pressure roller (10) against the draw-off roller (9) characterized in that in the working position (I) of the pressure roller (10), the spring element (12) is pretensioned by the actuator (11), whereby the spring element (12) is operatively connected to the actuator (11).
  8. The draw-off device (3) according to the preceding claim, characterized in that the pretension can be predetermined.
  9. The draw-off device (3) according to the preceding device claim, characterized in that the operative connection is releasable.
  10. The draw-off device (3) according to any one of the preceding device claims, characterized in that the actuator (11) comprises an electric motor (13), particularly a stepper motor, particularly a linear stepper motor.
  11. The draw-off device (3) according to any one of the preceding device claims, characterized in that the draw-off device (3) comprises a detecting device by means of which it can be detected whether the pressure roller (10) is in contact with the draw-off roller (9) and/or whether the spring element (12) is operationally connected to the actuator (11).
  12. The draw-off device (3) according to at least the device claim 10, characterized in that the spring element (12) is tensibly disposed in a sleeve (14) provided between a lifting element (15) of the electric motor (13) and an actuating lever (16) of the pressure roller (10).
  13. The draw-off device according to the preceding claim, characterized in that the sleeve (14) with respect to its axial direction is displaceably connected to the lifting element (15) and fixedly connected to the actuating lever (16).
EP18171238.1A 2017-05-10 2018-05-08 Method for pressing a pressure roller on a draw-off roller and draw-off device Active EP3401423B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017110066.0A DE102017110066A1 (en) 2017-05-10 2017-05-10 Method for pressing a pressure roller on a take-off roller and take-off device

Publications (2)

Publication Number Publication Date
EP3401423A1 EP3401423A1 (en) 2018-11-14
EP3401423B1 true EP3401423B1 (en) 2023-03-15

Family

ID=62142997

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18171238.1A Active EP3401423B1 (en) 2017-05-10 2018-05-08 Method for pressing a pressure roller on a draw-off roller and draw-off device

Country Status (3)

Country Link
EP (1) EP3401423B1 (en)
CN (1) CN108861811B (en)
DE (1) DE102017110066A1 (en)

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1289284A (en) * 1970-03-06 1972-09-13
DE2039473C3 (en) * 1970-08-08 1979-04-26 Zinser Textilmaschinen Gmbh, 7333 Ebersbach Open-end spinning machine
DE2130684A1 (en) * 1971-06-21 1973-01-11 Stahlecker Gmbh Wilhelm DEVICE FOR ATTACHING A PIECE OF YARN FOR AN OPEN-END SPINNING MACHINE
DE2265481C3 (en) * 1972-08-26 1981-08-06 Karl 5600 Wuppertal Bous Device for open-end spinning
CH562748A5 (en) * 1973-09-26 1975-06-13 Zellweger Uster Ag Transporting bands, slivers or yarns in textile measuring EQPT. - electronically controlled gear box drive provides optimal conditions
US4033519A (en) * 1974-06-06 1977-07-05 Teijin Limited Method and apparatus for automatically changing bobbins and winding yarn continuously
DE2518646C2 (en) * 1975-04-26 1986-08-21 W. Schlafhorst & Co, 4050 Mönchengladbach Device for controlling the contact pressure of a textile spool on a support or drive roller
DE4431537C2 (en) * 1994-09-03 1997-06-12 Rieter Ingolstadt Spinnerei Method for pressing a pressure roller onto the draw-off shaft of a rotor spinning machine and device for carrying it out
CN1267330C (en) * 1998-01-17 2006-08-02 苏拉有限及两合公司 Winder
DE19817363A1 (en) * 1998-04-18 1999-10-21 Schlafhorst & Co W Device for controlling the bobbin frame of a textile machine
DE19923047A1 (en) * 1999-05-20 2000-11-23 Rieter Ingolstadt Spinnerei Method and device for controlling a component of a textile machine having a plurality of similar workplaces next to one another
DE10021159A1 (en) * 2000-04-29 2001-11-15 Volkmann Gmbh Thread delivery unit, containing two delivery unit rolls
CN2611333Y (en) * 2003-03-28 2004-04-14 沈阳创想科技发展有限公司 Auto retractable appts. of cable
DE102005029937B4 (en) * 2005-06-28 2014-02-20 Saurer Germany Gmbh & Co. Kg Method for determining the quality parameters of a thread
DE102007024588A1 (en) * 2006-07-19 2008-01-24 Rieter Ingolstadt Spinnereimaschinenbau Ag Textile machine has multiple working places arranged next to each other, where thread tension adjustment device, together with pressure roller, is delimited by lifting mechanism of working position
CN103437003A (en) * 2013-08-07 2013-12-11 经纬纺织机械股份有限公司 Auxiliary pressurizing device for bobbin creel of rotor spinning machine

Also Published As

Publication number Publication date
DE102017110066A1 (en) 2018-11-15
EP3401423A1 (en) 2018-11-14
CN108861811A (en) 2018-11-23
CN108861811B (en) 2021-12-28

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