EP0677019B1 - Winding device - Google Patents

Abstract

A winding machine for winding a continuously supplied thread into a cross-wound bobbin has a cross-winding device which conveys the thread back and forth along a predetermined section which lies across the running direction of the thread. The winding machine has the following characteristics: the thread guide is centrally fixed above the cross-winding stroke and defines a tangential plane to a rotary cylinder that follows the cross-winding device. Driving arms (5, 6, 7, 8) are secured to two rotors (1, 2) that rotate in opposite directions. The axes of the rotors are arranged in a common plane (12). The wings move in two closely adjacent, parallel planes which perpendicularly intersect the planes (12) of the rotor axes. On one side of the thread running plane (10), a first template (9) is arranged in a plane which is closely adjacent and parallel to one of the planes of the wings and projects into the cross-winding plane, deflecting the head thread guide (13) in such a way that the thread is conveyed back and forth in the cross-winding direction at a substantially constant cross-winding speed or at a cross-winding speed predetermined according to a determined law of motion. Auxiliary templates (11) in the area of the ends of the cross-winding stroke lie in a plane parallel to the plane of the wings and are arranged on the side of the cross-winding plane (10) opposite to the main template (9). The planes (12) of the rotor axes and the main template (9) are arranged with respect to the cross-winding plane (10) in such a way that the main template does not project into the cross-winding plane in the area of the ends of the stroke, whereas the auxiliary templates (11) project into the cross-winding plane in the areas of the ends of the stroke, taking over the functions of guiding the thread and determining the cross-winding speed.

Description

The invention relates to a winding machine according to the preamble of claim 1. Such a winding machine is, for. B. known from DE-A-34 04 303, EP-A-120 216, DE-C-34 17 457, DE-A-37 03 731 A1.

In the traversing devices of these winding machines, the guide ruler has the following function: The driver arms have a constant angular velocity, but in the traversing direction, in which the thread is to be moved back and forth parallel to the bobbin axis, the guiding speed differs between the stroke ends. The guiding speed depends on the constantly changing angular position of the wings and is therefore meaningful. The main guideline deflects the thread out of the traversing plane in such a way that these speed differences are compensated for in the desired manner. By appropriate shaping of the guide ruler it can be achieved that the traversing speed between the stroke ends - ie apart from the short reversing areas in which the direction of movement is reversed - is constant. The shape of the guideline and the wings can also be used to specify desired laws of motion. The traversing plane is the tangential plane that is created by the head thread guide and the next rotating cylinder. on which the thread runs, is stretched. The head thread guide lies in the middle above the traverse stroke. It is at such a distance from the rotary cylinder that the thread accommodates the thread tension fluctuations caused by the traversing movement can endure. These thread tension fluctuations result from the fact that the thread length between the head thread guide and the rotating body changes continuously as a result of the traversing movement, that is to say increases and decreases. The rotating body is generally a contact roller, on which the thread runs and which the thread partially wraps around, in order to then run towards the bobbin.

In the traversing devices according to the prior art, it is possible to thread the thread over a large traversing stroke, e.g. 250 mm back and forth with just one rotor for each direction of movement. However, this has to compensate for large differences in the guiding speed. That is why the guideline protrudes far into the traversing plane, especially in the middle area of the Chaniger stroke, while it is close to the traversing plane in the area of the traversing stroke ends. The wrap angle of the thread on the guide ruler is correspondingly large in the central region of the traversing stroke and the wrap angle of the thread on the guide ruler is correspondingly small in the region of the stroke ends.

The object of the invention is. to avoid these large differences in the wrap angle, which also lead to different thread tensions, and thereby enable large traversing strokes.

The solution results from claim 1.

With this solution, the maximum wrap angles, which naturally occur in the area of the greatest deviation of the guide rulers from the traversing plane, can be reduced very greatly. An arrangement is preferred in which the maximum wrap angles are approximately the same size, so that the thread tension within certain Limits remain. The advantage of the invention is that an inadmissible reduction in the thread tension in the end regions of the traverse stroke can be avoided. In the known winding machine, the thread tension must be chosen so high that it does not fall below a minimum value even in the stroke end areas. On the other hand, this means that the thread tension is relatively high in the central region of the traversing stroke. With the invention, on the other hand, it is possible to counteract the tendency to decrease the thread tension in the stroke end regions and to remain above the minimum value even with a low thread tension.

The development according to claim 2 also brings about an equalization of the thread tension.

When winding a multifilament thread, the bobbin must be manufactured in such a way that the thread can run off the bobbin even at high speed. It becomes possible in particular when the thread is deposited on the bobbin in a closed form, ie: as if it were a uniform, essentially round body. The opposite of this is that the individual filaments that make up the thread are placed side by side on the spool. In this case, when the thread runs off, there is a risk that the individual filament elements belonging together will not come loose from the winding surface simultaneously and uniformly. The thread then runs unevenly and thread breakage or filament breakage can occur. Claim 3 has the particular advantage that in this embodiment of the invention the thread is deposited on the bobbin as a closed body - and not as a wide band consisting of individual filaments. In particular, it is avoided in this embodiment that a connection of the individual filaments that was previously through Blow out a sharp air flow on the thread has been made (tangling), is picked up and dissolved again.

A prerequisite here - as with all other versions - is that the two guide lines are arranged very close to one another and to the rotational planes of the driving arms.

The embodiment according to claim 4 allows a particularly exact thread transfer from one wing to the other in the reversal areas and avoids the mechanical engineering problem of the tight response of the guidelines.

In principle, it is possible to arrange the main guide on one or the other side of the thread plane. However, it is preferred that the main guide lies between the thread running plane and the rotor axis plane (claim 5). This is particularly advantageous for the operation and application of the thread.

It has already been stated that it is expedient to arrange at least the main guide - in the thread running direction - in front of the wing plane. In this case, the main guideline hides the wings if it is simultaneously arranged between the approach plane and the rotor axis plane. This makes the correct relative setting of the rotors difficult. The further embodiment according to claim 6 serves to avoid this. The respective guide rule consists of a frame attached to the machine frame and circumscribing a window. The part of the frame that projects into the traversing plane forms the guideline. For the rest, the window is cut out so far that especially the end regions of the traversing stroke, in which the thread is transferred from one wing to the other, are visible.

In the following an embodiment of the invention is described with reference to the drawing.

Fig. 1 und Fig. 2

Seitenansichten einer konventionellen Aufspulmaschine, wobei unterschiedliche Fadenstellungen bzgl. des Changierhubes dargestellt sind;

Fig. 3 und Fig. 4

ein Ausführungsbeispiel der Erfindung mit unterschiedlichen Fadenstellungen längs des Changierhubes;

Fig. 5

die Aufsicht (schematisch) auf eine Changiereinrichtung mit Hauptleitlineal und Hilfsleitlinealen;

Fig. 6

die Aufsicht weiterer Ausführungsbeispiele;

Fig. 7

die Seitenansicht eines Ausführungsbeispiels in mehreren Phasen der Changierbewegung.

Show it

1 and 2

Side views of a conventional winding machine, different thread positions are shown with respect to the traverse stroke;

3 and 4

an embodiment of the invention with different thread positions along the traversing stroke;

Fig. 5

the supervision (schematic) of a traversing device with a main guide and auxiliary guides;

Fig. 6

the supervision of further exemplary embodiments;

Fig. 7

the side view of an embodiment in several phases of the traversing movement.

The embodiments of winding machines shown in this application have the following in common: a thread runs over a head thread guide 13 to a traversing device and from there to a contact roller 12. The thread loops around the contact roller 12 partially, e.g. B. at 60 ° and then runs on the coil 16. The contact roller is in circumferential contact with the coil 16. The coil 16 is formed on a cardboard sleeve or plastic sleeve 15. The plastic sleeve 15 is clamped on a spindle 14. The spindle 14 will driven at a speed. which decreases in the course of the winding travel. The spindle drive is controlled as a function of the speed of the contact roller 12, which is measured for this purpose. The control of the spindle or the spindle drive is done in this way. that the speed of the contact roller 12 remains constant. The traversing device consists of the rotors 1 and 2, on which several driver arms - also called wings in the context of this application - are attached. The rotor 1 has z. B. two drive arms 5 and 6, which are each offset by 180 ° to each other. The rotor 2 has the driver arms 3 and 4, which are also offset from one another by 180 °. The rotors are arranged so that the driver arms 6 on the one hand and 3, 4 on the other hand rotate in two closely adjacent, mutually parallel planes of rotation. However, as can be seen from FIG. 5, the rotor axes are arranged eccentrically parallel to the coil.

The rotors are driven with the opposite direction of rotation and a phase shift of 90 °. If each of the rotors z. B. has three driver arms, these are offset by 120 ° to each other. Through the wings 3 to 6, the thread is guided along a guide ruler 9 (main guide ruler). Each time the thread is passed through a wing of one rotor. At the end of the stroke, this wing dips under the guide ruler and the thread guide in the opposite direction is then taken over by one of the wings of the other rotor, which comes out from under the guide ruler at this moment. Such a traversing device is described, for example, in EP-A-114 642 (Bag. 1321).

The following is shown in FIGS. 1 and 5:

Each of the rotors 1 and 2 of FIG. 5 has two to each other by 180 ° offset driver arms 3 and 4 or 5 and 6. The driving arm 5 currently has the thread guide and guides the thread to the left. At the traversing stroke end (line 7), it delivers the thread to the oncoming driver arm 7 of the rotor 2 rotating in opposite directions. The main guide ruler 9 projects into the traversing plane with a certain shape, which is indicated here as line 10; ie: The thread comes from the direction of the viewer and the traversing plane is perpendicular to the paper plane. In the area of the traversing stroke ends, the auxiliary guide rulers 11 are arranged in two planes that are closely adjacent to both the rotational planes of the driver arms and to one another. The main guideline protrudes from the same side into the traversing plane as the drive arms. The auxiliary guidelines 11 protrude from the opposite side into the traversing plane 10.

It now shows the winding machine according to the prior art (Fig. 1) that the main guide 9 in Figures 1 and 2 both at the end of the traversing stroke (representation according to Fig. 1) and in the middle of the traversing stroke (representation according to Fig. 2) deflects the thread from the traversing plane 10 shown in dashed lines.

As shown in FIG. 2, this results in a very large looping of the thread on the main guide in the central region of the traversing stroke. In the end areas, as shown in FIG. 1, there is only a very small wrap. This change in the wrap also results in a corresponding change in the thread tension with which the thread runs onto the contact roller 12 or onto the bobbin 16. The thread in the end regions - as shown in FIG. 1 - is no longer or only slightly deflected out of the traversing plane 10. This deflection is in the middle of the traversing stroke - As Fig. 2 shows - very large. This deflection results in a large thread tension, since the thread is delivered by a delivery device at a fixed speed and therefore each deflection translates into a corresponding extension and increase in the thread tension. On the other hand, the thread tension in the end regions must be so great that trouble-free winding operation is possible. Consequently, the thread tension in the middle area is all the greater and it cannot always be avoided that the thread tension in the middle area exceeds the damage limit.

In contrast, the exemplary embodiments according to FIGS. 3 and 4 and 6 and 7 provide a remedy.

From Figures 3 and 4 with the first embodiment according to the invention it can be seen that the common rotor axis plane 12 with the main guide ruler is so far removed from the traversing plane 10, also shown in broken lines, that the main guide ruler 9 at the traversing stroke ends (see FIG. 3) is not protrudes more into the traversing plane. Rather, the auxiliary guide rulers 11 protrude from the opposite side into the traversing plane and take over at the traversing stroke ends, in addition to the thread guidance and, if necessary, the compensation of the guiding speed of the driving arms in the sense of a desired course of the traversing speed, also the compensation of the wrap angle, which is on the main guiding ruler is lost as well as the compensation of the deflection of the thread from the traversing plane 10. As FIGS. 3 to 5 show, the main guide ruler 9 and the auxiliary guide ruler 11 overlap in the stroke end regions. As FIG. 5 shows, the auxiliary guidelines take over approximately or preferably - viewed from the center of the traversing stroke - somewhat before the intersection of the traversing plane 10 with the Main guideline 9. This ensures that the wrap angles on the main and auxiliary rulers are approximately the same size.

As FIGS. 6 and 7 show, the main guide 9 and the auxiliary guides 11 do not necessarily have to be arranged such that an overlap (view in the thread direction) takes place. Rather, the relative arrangement of the guide lines depends on the overall geometric arrangement of the thread path, the traversing device, the contact roller and the bobbin.

The individual phases are marked in FIG. 6 by the dashed lines IV. 7 shows the same winding machine in different phases I - V of the traversing movement which follow one another in the direction of the arrow. 7 I shows the situation in the middle of the traversing stroke. The wing 4 guides the thread while it is deflected by the main guide 9. In phase II, the thread in the end region of the traversing stroke is already immersed in the guide slot between the main ruler 9 and the auxiliary ruler 11. In this phase, the auxiliary guide 11 touches the thread for the first time. In phase III it can be seen that the thread is deflected by both the main ruler and the auxiliary ruler. Therefore, the wrap angle remains essentially constant.

In phase IV, the main ruler has completely withdrawn from the traversing level. The thread is now guided exclusively by the auxiliary guide. The traversing stroke end is shown in phase V. The thread is transferred from one wing 4 of one rotor to the other wing 6 of the other rotor. In this phase V, the auxiliary guide also has the sole guidance of the thread in the traversing direction.

Another special feature of the exemplary embodiment according to FIGS. 6 and 7 is that the main guide 9 and the auxiliary guides 11 are arranged in closely spaced parallel planes in front of the wing planes. This arrangement ensures that the thread does not break down into its individual filaments when it is lifted off on the contact roller 12 or the bobbin. Rather, the thread is deposited on the spool as a closed bundle of filaments and consequently also pulled off the spool as a closed bundle of filaments during unwinding. In the described wing maneuvering, it is necessary to adjust the wings on the rotors exactly so that the thread is transferred from one wing to the other wing at a certain point. For this you have to be able to watch the wings. Windows 17 of the main guideline and 18 of the auxiliary guideline serve this purpose. The guidelines are designed as a frame that leaves one window open.

REFERENCE SIGN LISTING

1

rotor

2nd

rotor

3rd

Drive arm

4th

Drive arm

5

Drive arm

6

Drive arm

7

Traverse stroke end

8th

Traverse stroke end

9

Main guideline

10th

Traversing plane

11

Auxiliary guidelines

12th

Contact roller

13

Head thread guide

14

spindle

15

Sleeve

16

Kitchen sink

17th

window

18th

window

Claims (6)

1. A winding machine for winding a continuously running thread to form a cross-wound bobbin (16), with a reciprocating device, which reciprocates the thread over a given distance (reciprocation stroke), transversely to the running direction of the thread (reciprocation direction), and having the following features:

   a thread guide (13) (top thread guide), which is arranged in a fixed manner centrally above the reciprocation stroke and which sets up a tangential plane (10) (reciprocation plane) to a rotary cylinder (16) (bobbin or contact roller) following the reciprocating device;

   two rotors (1, 2) rotating in opposite directions with driving arms (3-6) (blades) secured thereon; the rotor axes are arranged in a common plane (rotor axis plane); the blades move in two closely adjacent, parallel planes (blade planes), which intersect the rotor axis planes at right angles;

   a first guide bar (9) (main guide bar), which is arranged on one side of the thread running plane in a plane (main guide bar plane) which lies closely adjacent and parallel to the blade planes, the guide bar projecting into the reciprocation plane and thereby deflecting the top thread guide (13) in such a manner that the thread is reciprocated in the reciprocation direction at a substantially constant reciprocating velocity or a velocity determined according to a specific law of motion;

   auxiliary guide bars (11) in the region of the ends of the reciprocation stroke (stroke ends), which lie in a plane (auxiliary bar plane) parallel to the blade planes and which are arranged on the side of the reciprocation plane opposite the main guide bar;

   characterised in that the rotor axis plane and the main guide plane (9) are arranged relative to the reciprocation plane (10) in such a manner that the main guide bar (9) does not project into the reciprocation plane (10) in the region of the stroke ends, and in the region of the stroke ends the auxiliary guide bars (11) project into the reciprocation plane (10) and thereby take over the thread guidance and the determining of the reciprocation velocity.
2. A winding machine according to claim 1, characterised in that the rotor axis plane and the main guide bar (9) are arranged relative to the reciprocation plane (10) in such a manner that the angle of contact in the stroke centre of the main guide bar (9) and the angle of contact at the stroke ends of the auxiliary guide bars (11) are approximately equal.
3. A winding machine according to claim 1 or claim 2, characterised in that the main guide bar (9) and the auxiliary guide bars (11) lie in planes (main bar plane; auxiliary bar plane), which - in the thread running direction - lie in front of the blade planes and closely adjacent to one another.
4. A winding machine according to claim 1 or 2, characterised in that the main guide bar (9) - viewed in the thread running direction - and the auxiliary guide bar (11) - viewed in the thread running direction - lie on opposite sides of the blade planes.
5. A winding machine according to one of the preceding claims, characterised in that the main guide bar (9) is arranged on the same side of the thread running plane as the rotor axis plane.
6. A winding machine according to claim 5, characterised in that the guide bar (main guide bar 9 and/or auxiliary guide bar 11) arranged in front of the blade planes - viewed in the thread running direction - circumscribe a window (17, 18) for viewing the blades.

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