EP2170752B1 - Thread storage device - Google Patents

Abstract

The invention relates to a thread storage device (1) for use in the production of a bobbin (31) wound with a yarn, preferably designed as a cross-wound bobbin, having a needle (6) for inserting a loop of the yarn to be formed in the area of the free thread end (33) of the yarn beneath a winding layer of the bobbin (31), and a needle insertion device (8) for guiding the needle (6) to the bobbin (31), and for moving the needle (6) in order to insert the loop beneath the winding layer of the bobbin (31). The needle insertion device (8) comprises at least two electric motors (11, 12, 13), which are equipped for the controlled guidance of the needle (6) to the bobbin (31) by means of a control unit (35), wherein the needle insertion device (8) is preferably configured to perform the moving of the needle (6) for inserting the loop beneath the winding layer of the bobbin (31) by means of an electric motor (11) that can be controlled by the control unit (35).

Description

The invention relates to a device for storing the yarn end of a yarn (thread storage device) for use in the production of a yarn package wound with the yarn with a needle for inserting a loop of the yarn to be formed in the region of the free yarn end of the yarn under a winding layer of the yarn package, and a Nadeleinschiebvorrichtung for bringing the needle to the yarn package and for moving the needle for inserting the loop under the winding layer of the yarn package.

When producing bobbins, the problem arises that after completely winding the yarn package with yarn, a free yarn end of the yarn is present on the yarn package. If no provision is made for safekeeping, that is to say for fastening the free end of the thread, then the yarn package may be accidentally damaged, e.g. by pulling on the free end of the thread, are unwound, or it can come to a knot of the free end of the thread.

Various suggestions for keeping the free end of the thread on the yarn package are eg in the DE 1001166 disclosed. In this case, methods for sticking are used or special bobbin tubes are used with Verklemmvorrichtungen for the thread end.

In one approach, the thread end is inserted in the form of a loop by means of a needle under the uppermost winding layer or between the winding and the bobbin tube. The latter has the advantage that no additional elements for keeping the thread on the bobbin must be present, but the yarn itself is used for safekeeping. It will Preferably, the loop is formed such that the free end of the thread can be re-grasped and pulled out after it has been stored.

In particular, when the yarn package is formed as a cheese, it is usually a Nadeleinschiebvorrichtung used in which after complete winding of the yarn package, the needle, driven by gravity, is dropped onto the yarn package. By means of this drop needle, the free end of the thread is detected and inserted under formation of a loop under one of the uppermost winding layers of the yarn package.

This Nadeleinschiebvorrichtung is formed exclusively of mechanical elements, which, so that the needle falls into a matching position on the Garnspulenoberfläche and thus the insertion of the needle is performed correctly, must be adjusted very accurately. The case needle must therefore be adjusted mechanically so that it reaches under a free winding edge of the yarn package and can be inserted.

The procedure of the needle, so their movement trajectory, and their initial and final position are given and can be adjusted mechanically only by manual intervention.

For different yarn packages, e.g. different spool shapes, yarn types or Bewickungsdicken a mechanical Nadeleinschiebvorrichtung must be readjusted each time, which is very time consuming. In addition, there is a risk with such mechanical Nadeleinschiebvorrichtung that due to lack of adjustment, the uppermost winding layers of the yarn package are damaged.

The publication EP 1136413 A1 (D1) describes a device for versetzung a thread end to a yarn package in which a Nadeleinschiebvorrichtung by means of two electric motors, a needle leads to the yarn package and by means of the needle the thread end abuts the yarn package. The approach of the needle to the yarn package is made by moving a lever armature attached to a support plate in the direction of the yarn package by means of a driven by one of the electric motors spindle rod. The insertion of the thread end to Verdestung is made by means of the lever linkage. A displacement by operating a spindle rod leads to a relatively slow movement. The lever linkage is attached via two pivot points on the support plate and has further rotary joints of sub-rods, so that an exact movement of the needle for Verfahrung is complicated by the complicated lever rod mechanism.

The invention has for its object to provide a thread storage device which avoids the disadvantages of the prior art, in particular, a complex adjustment of the thread storage device should be avoidable before their use in the production of a yarn package.

This object is achieved by the thread storage device of the independent claim. The dependent claims represent preferred embodiments of the invention.

A yarn storage device according to the present invention for use in producing a yarn package wound with a yarn, preferably a cross-wound bobbin, comprises a needle for inserting a loop of the yarn to be formed in the area of the yarn end of the yarn under a winding layer of the yarn package, and a needle insertion device for feeding the needle to the bobbin and for moving the needle to insert the loop under the winding position of the yarn package. The needle is shaped such that it can catch (catch) the thread in the region of the free thread end, for which purpose the needle advantageously has a hook shape or notch in the region of its free end, ie its needle point. The Nadeleinschiebvorrichtung comprises at least two electric motors, arranged for controllable by a control unit approaching the needle to the yarn package. In principle, by means of the two electric motors, the needle can be moved as desired in parallel and perpendicular to the spool axis of the yarn package by the control unit. Advantageously, the Nadeleinschiebvorrichtung be adapted to perform the method of the needle for inserting the loop under the winding layer of the yarn package by an electric motor controllable by means of the control unit.

According to the invention, the needle insertion device has an arm which can be pivoted about an axis of rotation preferably oriented substantially parallel to the yarn package longitudinal axis, wherein the needle is mounted in a region on the end of the arm remote from the axis of rotation, such that when the arm is moved in a direction parallel to the axis of rotation after the needle has been suitably fed to the bobbin, the insertion of the loop under the winding position of the bobbin can be carried out.

About such an arm, the actual insertion and the last section of the feeding of the needle to the yarn package can be performed very quickly and accurately. The needle is preferably brought from below to the yarn package, ie raised. The arm causes the inventive Thread storage device during the winding of the bobbin can not interfere with the yarn path of the wound yarn.

Since the electric motors can be controlled, for example by means of a computer as a control unit for pre-insertion and insertion, no exact adjustments of the needle position and the needle insertion device must be made when using the thread storage device according to the invention. The storage of the free end of the thread no longer has to be mechanically preset and configured by hand. The two electric motors are arranged such that the needle or its needle tip, controlled by the control unit can be accurately positioned on a surface of the yarn package. The electric motors are designed to move the needle at least in two spatial directions.

If a total of three electric motors are provided, the needle, with appropriate arrangement of the electric motors, in any direction in space can be arbitrarily positioned in position controlled by the control unit.

A significant advantage of the thread storage device according to the invention lies in enabling a basically arbitrary positioning of the needle. The thread can be caught by the needle (repository needle) even before it is to be stored in order to form the free end of the thread.

Advantageously, the control unit is set up to control the electric motors according to a predetermined sequence of movements. The sequence of movements for the storage of the free end of the thread must therefore be specified only once before the use of the thread storage device according to the invention, i. e.g. learned. The movement sequence can be predetermined depending on various parameters. These parameters may e.g. the type of wrapping and / or the sleeve on which the yarn is spooled to make the yarn package, i. generally depend on the winding recipe. The movement can be e.g. calculated from the bobbin diameter of the finished wound bobbin and the position of the sleeve (drum position) as parameters. Parameter sets can be maintained for different bobbins, so that when changing the bobbins only by entering into the control unit, the bobbins must be specified in order to use the associated parameter set for calculating the movement sequence.

Preferably, the control unit is set up, at least one of the electric motors in response to a current contact pressure of the needle to control the yarn package and / or depending on a current insertion pressure of the needle into the yarn package. The current contact pressure and / or the insertion pressure can be determined via at least one sensor for detecting controlled variables for controlling the electric motors as input data for the control unit. As a sensor can serve a current-voltage monitoring one of the motors, so that the power of this motor for deriving the control variables is used and can be controlled.

When the needle is mounted on the arm with its longitudinal axis substantially parallel to the axis of rotation, or forming an acute angle with the axis of rotation, the insertion of the loop of the yarn under a reel of the yarn package with a single movement, ie by controlling a single electric motor, be executed. The needle point need only be pre-positioned at an appropriate position on the surface of the yarn package. Very advantageously, one of the electric motors is set up to move the arm in a direction parallel to its axis of rotation, and one of the electric motors is arranged to pivot the arm about its axis of rotation, preferably wherein another of the electric motors is adapted to move the arm in a spatial direction perpendicular to the axis of rotation , Wherein, by means of the further electric motor, the distance between the axis of rotation and the Garnspulenlängsachse is adjustable. With such a configuration, in principle, the needle can be moved arbitrarily in all spatial directions. In particular, a pre-positioning of the arm on an XY plane is possible such that only by raising the arm about its axis of rotation, the final positioning of the needle tip before inserting the loop is possible.

If a coil spring is provided, with the coil spring stably holding the arm in a home position, a more stable movement of the arm is possible. It can even be lowered from the top of the yarn package, the needle because the electric motor works to pivot the arm about its axis of rotation substantially against the spring force.

When the region at the non-rotating end of the arm on which the needle is mounted has adjustment means for adjusting the position of the needle, the mounting position of the thread storage device on a yarn package making machine can be made more flexible.

A bobbin production machine according to the invention comprises a thread storage device according to the invention and a control unit configured to control the electric motors of the thread storage device. In this case, at least one sensor for detecting controlled variables for controlling the electric motors can be provided as input data for the control unit.

• Figur 1 zeigt eine als eine Baueinheit ausgeführte erfindungsgemäße Fadenverwahrungsvorrichtung in einer perspektivischen Darstellung.
• Figur 2 zeigt die Fadenverwahrungsvorrichtung aus Figur 1 in einer Seitenansicht.

The invention will be explained in more detail using an exemplary embodiment with reference to the drawings.

• FIG. 1 shows a running as a structural unit thread storage device according to the invention in a perspective view.
• FIG. 2 shows the thread storage device FIG. 1 in a side view.

The representations of the drawings show the subject matter according to the invention in a highly schematized manner and are not to be understood to scale. The individual components of the article according to the invention are shown so that their structure can be well shown.

In the FIG. 1 there is shown a thread-storing device 1 according to the invention designed as a structural unit for use in the production of a yarn package wound with a yarn. The yarn package is advantageously positioned in an area above the thread storage device when installing the thread storage device on eg a yarn making machine or a rewinding machine, wherein the yarn path of the yarn to be wound on the yarn package from below, in the representation in an area to the right of the thread storage device, runs on the yarn package , For mounting the thread storage device, the thread storage device on a base plate 3 screw holes 4.

The thread storage device 1 has a needle 6 for inserting a loop of the yarn to be formed in the region of the free yarn end of the yarn under a winding layer of the yarn package. To bring the needle 6 to the yarn package and to move the needle to insert the loop under the Winding position of the yarn package, the thread storage device 1 according to the invention comprises a Nadeleinschiebvorrichtung 8 with three electric motors 11,12,13 by means of which controlled by a control unit, the needle 6 can be brought to the yarn package and moved to insert the loop. The electric motors can be designed, for example, at least partially as stepper motors. In order to grip the free yarn end of the yarn, a hook-like notch 15 (catch notch) is provided on the needle 6 in the region of the needle tip of the needle 6.

The needle 6 is mounted on the end facing away from the axis of rotation of an arm 18 pivotable about an axis of rotation 17 aligned substantially parallel to the yarn package longitudinal axis. The pivotability of the arm 18 is symbolized in the figure by a curved double arrow. The needle 6 is oriented so that, after a suitable approach the needle 6 to the yarn package, the insertion of the loop under the winding layer of the yarn package by operation of the arm 18 in a direction parallel to its axis of rotation 17 is vornehmbar. A first of the electric motors 11 is set up for this process of the arm 18, symbolized in the figure by a first double arrow. The arm 18 is mounted on a carriage-like base 20, which can be experienced on rail-like guides 22 on the base plate 3. This first electric motor 11 is fastened to the base plate 3 and can move the base 20 with the arm 18 mounted thereon over the base plate 3 via a belt drive 24.

A second of the electric motors 12 is arranged for pivoting the arm 18 about its axis of rotation 17. The motor rotation axis of this second electric motor 12 is formed in the figure as a direct extension of the rotation axis 17 of the arm 18, the electric motor 12 being mounted on the base 20 on which the arm 18 is mounted. However, it can also be a torque transmission device, eg with a translation between be mounted this electric motor 12 and the rotation axis 17 of the arm 18. The arm 18 is held stable by a coil spring 25 in an initial position, or retracted via the coil spring 25 in this starting position, after the arm 18 has been pivoted about the associated electric motor 12.

A third electric motor 13 of the electric motors is set up for moving the arm 18 in a spatial direction perpendicular to the axis of rotation 17, wherein the distance between the axis of rotation 17 and the yarn package longitudinal axis can be adjusted by means of this third electric motor 13. The latter is symbolized by another double arrow in the figure. For this purpose, between the base 20, on which the arm 18 is mounted, and the base plate 3 is provided a slide device, not shown in the figure. This carriage device may e.g. be performed as part of the base 20 in a rail on the underside of the base 20 and is further on the rail-like guides 22 on the base plate 3 movable. The third electric motor 13 is fastened to this carriage device and has a further belt drive 26 for moving the arm 18 in said spatial direction. By means of the first 11 and the third electric motor 13, the needle insertion device 8, or its arm 18, can be positioned in an arbitrarily electronically controlled manner in an area in an XY plane.

The needle 6 is mounted with its longitudinal axis substantially parallel to the axis of rotation 17 of the arm 18 on the arm 18 in a needle position. In this case, the region on the end remote from the axis of rotation of the arm 18, on which the needle 6 is mounted, adjusting means 30 for adjusting the position of the needle 6. By means of this adjusting means 30, a coarse adjustment of the needle position can be made.

In FIG. 2 is the thread storage device 1 from FIG. 1 shown in a side view, wherein their positioning relative to the yarn package 31st and the yarn path of the yarn to be wound onto the yarn package 31 whose yarn end 33 is to be stored is shown. The Nadeleinschiebvorrichtung 8 itself is, apart from its arm 18, symbolized only by a rectangle.

• Aus einer Startposition heraus wird zunächst der Arm 18 und damit die Nadel 6 mittels des oben beschriebenen dritten Elektromotors in Richtung des dargestellten geraden Pfeils an den Fadenlauf des Garns herangeführt. Der Arm 18 wird also derart in Richtung der Garnspule 31 verfahren, dass der Abstand zwischen der Drehachse 17 des Arms 18 und der Garnspule 31 in gewünschter Weise, d.h. gemäß einem der Steuereinheit 35 vorgegebenen Bewegungsablaufes, eingestellt wird.

In the process of storing the free yarn end 33 of the yarn of the yarn package 31, the electric motors of the yarn storage apparatus 1 are controlled and / or controlled by means of a control unit 35, eg a computer, for example in the following manner:

• From a starting position, the arm 18 and thus the needle 6 is first introduced by means of the third electric motor described above in the direction of the straight arrow shown to the yarn path of the yarn. The arm 18 is thus moved in the direction of the yarn package 31 so that the distance between the axis of rotation 17 of the arm 18 and the yarn package 31 in the desired manner, ie according to a control sequence 35 predetermined movement sequence is set.

Then, the arm 18 is rotated about its axis of rotation 17 by means of the second electric motor described so that the needle 6 is raised and pressed against the surface of the yarn package 31, preferably with a, as part of the predetermined sequence of movement, predetermined contact pressure. The arm 18 is pressed against the spring force of the coil spring 25 in the direction of the illustrated curved arrow upwards. The needle 6 already presses the free end of the thread 33 with the surface of the yarn package 31st

Subsequently, by means of the described first electric motor, the needle 6 is substantially parallel to the yarn package longitudinal axis, ie its axis of rotation 37, in the direction of the needle tip, i. in the figure out of the plane to the front, moved. In this case, the free end of the thread 33 is first gripped by the hook-like notch on the needle 6 and subsequently pushed under formation of a loop under a winding layer of the yarn package 31.

By means of the first electric motor can also, for example, before the operation of the second and / or third electric motor, one according to the predetermined Movement sequence desired positioning of the needle tip along the longitudinal axis of the yarn package 31 are made.

Finally, the free yarn end 33 of the yarn is e.g. is released by cutting from the yarn processing machine from which the yarn package 31 is wound, and the needle 6 is controlled by the electric motors controlled back to the starting position.

• Zunächst wird der Faden bereits bevor er von der fertig aufgewickelten Garnspule 31 abgeschnitten wird durch Heranfahren der Nadel 6 an den Fadenlauf des Fadens durch die Nadel 6 eingefangen, d.h. die Nadel 6 wird so positioniert, dass der Faden in der Einfangkerbe der Nadel 6 eingehakt ist. Daraufhin wird die Nadel 6 so verfahren, dass sie tangential, und in im Wesentlichen paralleler Orientierung zur Garnspulenlängsachse, an die Spulenoberfläche gepresst wird und mit ihrer Nadelspitze an einer Wickelflanke der oberen Kreuzwicklungen der Garnspule anliegt. Dabei wird der Faden von der Nadel 6 mitgeführt. Nachfolgend wird die Garnspule 31 durch einen Garnspulenantrieb derart um ihre Längsachse etwas verdreht, dass die Nadelspitze mit dem in der Einfangkerbe geführten Faden unter Ausbildung einer Schlaufe unter die zu der Wickelflanke zugehörige Kreuzwicklungslage untergeschoben wird. Abschließend wird die Nadel 6 mittels der Elektromotoren kontrolliert in die Startposition zurückverfahren ohne die Kreuzwicklungslagen zu beschädigen und ohne die ausgebildete Schlaufe wieder herauszuziehen.

Alternatively, it is also possible to proceed by means of a control unit 35 by controlling the electric motors of the thread storage device 1 by means of a control unit 35 when storing the trainees free thread end 33 of the yarn, in particular a cross-wound bobbin as a yarn package 31:

• First, the yarn is already caught before it is cut off from the finished wound yarn package 31 by approaching the needle 6 to the threadline of the thread through the needle 6, ie, the needle 6 is positioned so that the thread is hooked in the catching groove of the needle 6 , Then, the needle 6 is moved so that it is pressed tangentially, and in a direction substantially parallel to the Garnspulenlängsachse, to the bobbin surface and rests with its needle tip on a winding flank of the upper cross windings of the yarn package. The thread is carried by the needle 6. Subsequently, the yarn package 31 is rotated by a yarn package drive about its longitudinal axis slightly so that the needle tip is pushed with the guided in the catching yarn to form a loop under the associated to the winding edge cross winding position. Finally, the needle 6 controlled by means of the electric motors in the starting position without damage to the cross winding layers and without pulling out the trained loop again.

Pushing the thread under a last winding layer thus takes place in that the needle, after it has caught the thread (which is stretched tangentially downwards from the coil to be removed), is pressed tangentially against the coil surface. This pressure point is exactly tangential to choose because the winding material otherwise injured or the needle can not be pushed under the layers. The actual pushing can not happen now by a movement of the needle because otherwise this ideal tangent position would leave. The needle remains in place and by rotation of the coil axis by a predetermined angle value, the needle is pushed under the layers because they run so obliquely to the coil axis.

The needle tip can also be designed as a clamping cutting head. In this case, the needle tip or a clamping cutting head device mounted below the needle has a sharpened edge (blade). This blade is positioned on the needle so that when the needle is moved back, the thread can be severed by the blade and thus the finished yarn package is cut off.

Further, the needle of the thread storage device according to the invention, or the clamping cutting head device which is disposed below the needle can be used to insert the thread after cutting the finished yarn package in a clamping ring which is used for winding the new empty tube for a wound up further yarn package , Such a clamping ring may be formed as part of a thread holder for holding the thread. In this case, the clamping ring preferably has two substantially annular clamping jaws and the clamping jaws surround a rotatable drive shaft of a drive flange for a sleeve receptacle for the yarn package or the empty tube. The jaws are compressed to clamp the positioned between them thread by means of a drive.

Proposed is a thread storage device 1 for use in the production of a wound with a yarn, preferably designed as a cross-wound bobbin 31, with a needle 6 for inserting a in the field of the yarn end of the yarn to be formed under a winding layer of the yarn package 31; and a needle insertion device 8 for feeding the needle 6 to the yarn package 31 and moving the needle 6 to insert the loop under the winding layer of the yarn package 31. The needle insertion device 8 has at least two electric motors 11,12,13, arranged for by means of a control unit 35 controllable bringing the needle 6 to the yarn package 31, preferably, wherein the Nadeleinschiebvorrichtung 8 is set, the method of the needle 6 for inserting the loop under the winding layer of the yarn package 31 make by an controllable by the control unit 35 electric motor 11.

The invention is not limited to the embodiments given above. Rather, a number of variants are conceivable, which make use of the features of the invention even with fundamentally different type of execution.

Claims (9)

1. Thread tuck-in device (1) for use in the manufacture of a yarn bobbin (31) wound with a yarn, preferably in the form of a cross-wound bobbin, having
   a needle (6) for inserting a loop of the yarn, which is to be formed in the region of the free thread end (33) of the yarn, beneath a winding layer of the yarn bobbin (31), and
   a needle insertion device (8) for advancing the needle (6) towards the yarn bobbin (31) and for moving the needle (6) to insert the loop beneath the winding layer of the yarn bobbin (31), wherein
   the needle insertion device (8) comprises at least two electric motors (11, 12, 13), which are arranged for advancement of the needle (6), monitorable by means of a control unit (35), towards the yarn bobbin (31), wherein the needle insertion device (8) is arranged to effect movement of the needle (6) for insertion of the loop beneath the winding layer of the yarn bobbin (31) by an electric motor (11) controllable by means of the control unit (35), characterized in that the needle insertion device (8) comprises an arm (18) pivotable about an axis of rotation (17) aligned substantially parallel to the longitudinal axis (37) of the yarn bobbin, the needle (6) being mounted in a region at the end of the arm (18) remote from the axis of rotation such that when the arm (18) is moved in a direction parallel to the axis of rotation (17), insertion of the loop beneath the winding layer of the yarn bobbin (31) can be effected.
2. Thread tuck-in device according to claim 1, characterised in that the control unit (35) is arranged to control the electric motors (11, 12 ,13) according to a predetermined motion sequence.
3. Thread tuck-in device according to claim 1 or claim 2, characterised in that the control unit (35) is arranged to control at least one of the electric motors (11, 12, 13) as a function of a current contact pressure of the needle (6) on the yarn bobbin (31) and/or as a function of a current insertion pressure of the needle (6) into the yarn bobbin (31).
4. Thread tuck-in device according to any one of the claims 1 to 3, characterised in that the needle (6) is mounted on the arm (18) with its longitudinal axis substantially parallel to the axis of rotation (17), or forming an acute angle with the axis of rotation (17).
5. Thread tuck-in device according to any one of the claims 1 to 4, characterised in that one of the electric motors (11) is arranged to move the arm (18) in a direction parallel to the axis of rotation (17) of the arm (18), and one of the electric motors (12) is arranged to pivot the arm (18) about its axis of rotation (17), preferably wherein a further one of the electric motors (13) is arranged to move the arm (18) in a direction in space perpendicular to its axis of rotation (17), the distance between the axis of rotation (17) and the yarn bobbin longitudinal axis (37) being adjustable by means of the further electric motor (13).
6. Thread tuck-in device according to any one of the claims 1 to 5, characterised in that a helical spring (25) is provided, the helical spring (25) holding the arm (18) in a stable starting position.
7. Thread tuck-in device according to any one of the claims 1 to 6, characterised in that the region at the end, remote from the axis of rotation, of the arm (18) on which the needle (6) is mounted comprises adjusting means (30) for adjusting the position of the needle (6).
8. Yarn bobbin manufacturing machine having a thread tuck-in device (1) according to any one of the claims 1 to 7 and a control unit (35), arranged to control the electric motors (11, 12, 13) of the thread tuck-in device (1).
9. Yarn bobbin manufacturing machine according to claim 8, characterised in that at least one sensor is provided to acquire control variables for control of the electric motors (11,12, 13) as input data for the control unit (35).

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