EP0937007B1 - Method and device for winding a thread running at a constant speed - Google Patents

Abstract

The invention relates to a method and device for winding a thread (2) running at a constant speed onto a bobbin (4) by means of a winding spindle (3) driven by a motor (18). The thread is fed to a cross-winding device (8) which moves the thread backwards and forth along the surface of the bobbin transversely to its running direction. Before the thread runs into the cross-winding device, it is guided with a sag by the roller (10) of a dancing arm (9) which is located between two fixed thread guides (14, 15). The speed of the winding spindle is adjusted according to the position of the dancing arm in such a way that there is a uniform sag in the thread between the fixed thread guides (14, 15). According to the invention the thread is partially twisted around the dancing arm roller (10) several times so that the amplitude of the movement of the roller can be reduced in proportion to the number of twists around it.

Description

The invention relates to a method for winding a constant Speed starting thread according to the preamble of the claim 1 and a winding machine according to the preamble of claim 4.

The method and winding machine are known from DE-OS 39 33 048.

With this winding machine, the one starting at constant speed Thread wound into a bobbin by means of a driven winding spindle. To wind up the thread with even thread tension , the winding speed must be equal to the feeding speed of the thread. For this purpose, the thread is placed between two stationary Threaded dancer arm role guided. The dancer arm role is on attached to a dancer arm loaded with a torque. hereby a slack is created in the thread between the two thread guides. A control loop is used depending on the position of the dancer’s position the speed of the winding spindle and thus the peripheral speed the bobbin regulated so that the thread when winding from the beginning to End of the winding trip always has the same sag.

In such winding machines, the absolute thread length changes between the thread guide upstream of the traversing and the deposit point of the thread on the bobbin due to the traversing movement with each traversing stroke of the traversing thread guide.

In order to compensate for this difference in length, the dancer arm must be Position with a frequency that corresponds to twice the traversing frequency, consequences. The dancer arm can determine this frequency due to its mass and geometric shape, do not follow. The necessary amplitude and frequency the movement of the dancer arm role or the dancer arm can be increased The speed of the oscillation cannot be reached. That’s what happens to thread tension changes, which either overstretch the thread or dumped.

EP 0 542 419 and EP 0 114 365 are dancer rolls or rollers for the Tension control and also as a buffer for the intermittent operation of Wire feeders are known in which multiple wraps are used. This However, solutions are not readily available on textile machines for manufacturing and winding transferable by threads.

Accordingly, it is an object of the invention to provide a method and a Application of the method suitable winding machine of the aforementioned Kind in such a way that the winding regardless of The oscillating movement is independent of the winding tension The oscillating movement remains constant.

This object is achieved according to the invention by a method with the features of claim 1 and a winding machine with the features of Claim 4 solved.

The invention was also described in the published patent application DE 40 05 793 not suggested. Here, a wire over a Deflection device guided on a dancer arm. The dancer arm is with one Brake coupled, tensioned by a spring acting on the dancer arm becomes. By acting on the deflection device of the dancer arm Wire traction creates a more or less strong braking force. This means that relatively low wire tensions result in a very high one Brernskraft.

In contrast, the invention compensates for the fluctuation change in length of the thread. With the dancer arm-controlled winding machine the winding spindle speed is controlled so that the winding speed of the thread is equal to the feeding speed of the thread.

Because the thread with the traversing thread guide is transverse to its running direction the coil surface is moved back and forth, the length changes between the thread guide upstream of the traversing and the run-up point the bobbin constantly, creating the balance between the winding speed and the feed speed with each traverse stroke is disturbed. The invention now provides a solution, such as the length of the Thread from the point of contact of the bobbin to that upstream of the dancer arm roll Thread guide to which the thread is moving at a constant speed accumulates, can be kept constant. To compensate for the The dancer arm must change the length of the thread due to the change Make a compensation stroke dependent on the number of wraps is a fraction of the distance change. So is already at double wrap against the amplitude of the dancer arm movement halved the previous single loop. So that with one Mass inertia dancer arm only half of the time unit Travel away and therefore experience a significantly lower acceleration. This also makes the speed of the dancer arm dependent proportionally reduced by the number of wraps. The dancer arm can compensate for the difference in length even at higher frequencies cause without overstretching or folding of the thread comes.

Another advantage of the invention is that the weight of the dancer arm role or the torque acting on the dancer arm also in Depending on the number of wraps only a fraction affects the thread tension. In the case of double wrapping, only a quarter of the force acting on the dancer arm role in the thread effective. The method according to the invention is therefore also particularly suitable for winding threads with fine titers at relatively low Thread tensions are wound.

Due to the multiple wrapping of the dancer arm role between the two Fixed thread guides will also have a much larger storage path formed, which compensate for extreme external delivery disruptions much better can.

The defined multiple looping of the dancer arm role is formed that the thread running onto the dancer arm roll first runs out one or more times to a fixed thread guide and back is directed. This creates several partial wraps on the Dancer arm role.

An advantageous development of the method provides that this multiple deflection the thread between the dancer arm and one of the two stationary thread guide is formed. This also adds the thread attacking friction forces avoided.

The winding machine according to the invention for applying the method is characterized in that the thread on the dancer arm role in each a thread running groove is guided. This ensures that even at constant vibrations of the dancer arm the thread around the dancer arm role is conducted safely. For this purpose, the thread running grooves have the same diameter on.

Since there is multiple wrapping of the thread between two or more Roles and the constant swinging movement of the dancer arm to different Circumferential speeds of the coiled rolls can inadmissibly high tensile forces are created in the thread. To this Purpose, it is advantageous that the thread per wrap by one freely rotatable roller is guided. According to the roles as Be co-rotating or counter-rotating. This means that both Z-shaped, Realize S-shaped or O-shaped loops of the thread.

For a slip-free thread run in the winding machine according to the invention To enable, it is advantageous if the multiple wrapped stationary thread guides also freely rotatable rollers per loop having.

The thread deflections can therefore on the dancer arm role over the stationary thread guide both via independently rotatable bearings Rolls as well as a single continuous cylindrical roll respectively.

The multiple deflection of the thread takes place advantageously between the Dancer arm role and one of the two fixed thread guides, which with the Dancer arm roll form the slack of the thread.

Below is an embodiment with reference to the drawing the winding machine according to the invention for the application of the invention Procedure described.

Fig. 1

schematisch ein Ausführungsbeispiel der erfindungsgemäßen Aufspulmaschine;

Fig. 2

eine Gleichlauftänzerarmrolle zur Fadenführung;

Fig. 3

eine Gegenlauflänzerarmrolle zur Fadenführung;

Fig. 4

eine Gegenlauftänzerarmrolle zur Fadenführung.

Show it:

Fig. 1

schematically an embodiment of the winding machine according to the invention;

Fig. 2

a synchronous dancer arm role for thread guidance;

Fig. 3

a counter-runner arm roller for thread guidance;

Fig. 4

a counter-rotating dancer arm roller for thread guidance.

In Fig. 1, an embodiment of a winding machine is shown in perspective. Here, the winding head is arranged on a vertical stand plate 1. At the support plate 1 is the winding spindle 3, on which the coil 4 is opened with the winding tube 5, rt cantilever binge. The traversing device 8 for traversing the incoming thread 2 is assigned to the winding spindle 3. The traversing device 8 parallel to the bobbin 4 consists of a housing 6, in which a reversing thread shaft is rotatably mounted, and the traversing thread guide 7, which is moved back and forth by the reversing thread shaft in a straight guide and which lays the thread 2 on the bobbin. In order to achieve a constant distance between the surface of the coil 4 and the traversing device 8, a support roller 20 is freely rotatably mounted on the housing 6 of the traversing device.

The traversing device 8 with the reverse thread shaft is on a carriage 21 attached. The carriage 21 is mounted in a carriage guide 22 which a linear movement - radial or secant to the coil - allows. The Carriage 21 is spring-loaded such that the traversing device 8 is itself during the entire winding trip with its support roller 20 against the surface of the bobbin supports, but the increasing diameter of the coil 4th can dodge.

The fed thread 2 runs before it from the traversing thread guide 7 on the The bobbin surface is laid over two fixed thread guides 14 and 15, between which a dancer arm 9 with a dancer arm roller 10 is pivotable is arranged. The dancer arm roll 10 is under the weight of the dancer arm 9 on the thread. By the growth of the coil 4 and the Shortening of the thread loop formed between the thread guides 14 and 15 (Sag) the swivel angle of the dancer arm 9 is changed and depending on this by a mechanical-electrical control device 17 the speed of the spindle motor 18 for the winding spindle electronically readjusted.

On the other side of the stand plate 1 is the spindle motor 18 for the Drive of the winding spindle 3 attached. The winding spindle drive is with the Reverse thread shaft connected in such a way that during the entire winding cycle The ratio of the winding spindle speed and the traversing frequency remains constant.

The thread 2 first runs onto the thread guide 14. The thread guide 14 consists of a guide roller 11 which is rotatable on an axis 13 is stored. The axis 13 is attached to the stand plate 1. The string then runs from the thread guide 14 to the dancer arm roll 10. Die Dancer arm roller has two parallel thread grooves formed side by side 32.1 and 32.2. The thread that runs from the thread guide 14 is deflected in one of the thread running grooves and to the second thread guide 15 guided. The thread guide 15 consists of the thread guide roller 12, which an axis 16 is rotatably mounted. The axis 16 is on the stand plate 1 attached. The thread guide roller 12 also has two thread guide grooves with the same diameter.

The thread is now passed around one of the guide grooves. After that the thread wraps around the second thread guide groove of the dancer arm roll 10, to then over the second thread guide groove of the guide roller 12 of the Thread guide 15 to run to traversing thread guide 7.

The thread runs at a constant speed. This forms between the thread guides 14 and 15 due to the constant weight of the Dancer arms 9 with the dancer arm role 10 - possibly reinforced by one Torque sensor 24 - a slack. The size of this slack will be determined on the one hand by the delivery speed of the thread and on the other others by the winding speed. The size of the slack is adjusted to a constant value. For this purpose, the axis 31 of the Dancer arms connected to a rotary sensor 19. By the rotary sensor 19 the position and the speed of the position change of the Dancer arms detected. The rotation sensor 19 is equipped with a control device 17 coupled. The spindle motor 18 is controlled by the control device 17. If the sag of the thread increases and consequently the dancer arm 9 pivots counterclockwise, the drive speed of the spindle motor 18 increased. If the sag decreases, it will the drive speed is reduced. The dancer arm 9 and the control device 17 are therefore included in a control loop through which the sag of the Thread loop between the thread guides 14 and 15 is corrected. The Control device 17 is however set such that the high-frequency Vibrations of the dancer arm, which arise due to the traversing movement, do not lead to control of the spindle motor.

When the thread traverses, there is a maximum difference in length Length between the run-off point from the thread guide 15 to the run-on point the coil 4 each in the traversing stroke ends. This difference in length is now compensated by the fact that the dancer arm in each Changierhubenden a path is pivoted clockwise, so that the Thread length constant from the thread guide 14 to the point of the bobbin remains. In the embodiment shown in Fig. 1, the amplitude of the movement the dancer arm role or the dancer arm a quarter as large as that difference in length of the thread caused by the traversing. The Amplitude of the dancer arm movement can be determined by the number of wraps decrease proportionally at the dancer arm role. With that the Speed and thus the dynamics of the dancer arm significantly reduced. This behavior therefore has a positive effect on the control mechanism out. The dancer arm will vibrate synchronously with the traversing frequency, so that the traversing does not affect the winding speed and the Feed speed affects. This allows a winding with substantially constant thread tension and thus a good bobbin build achieve. Because the force of the dancer arm acting on the dancer arm role is absorbed by the number of wraps, the force to be absorbed in the thread. This makes it possible to use the dancer arm to load a higher torque or a harder spring, what again allows an increase in frequency.

On the other hand, it becomes possible with the winding machine according to the invention Winding threads with low thread tension.

In Fig. 2, an arrangement of guide rollers as shown as Dancer arm role could be used. Here is a double synchronized dancer arm role shown. The dancer arm role consists of a first one Role 25.1 and a second role 25.2. The roller 25.1 is on a shaft 26 attached in the central area. The shaft 26 has one end supported by the bearings 28 in a hollow cylindrical axis 29. On the opposite end of the shaft 26, the second roller 25.2 is over Bearing 27 rotatably mounted. The roller 25.1 rotates with the shaft 26. Die Roll 25.2, which is mounted on the rotating shaft, rotates in the same Rotation. At the bearing 27 is therefore only the differential speed of both Roles effective. This dancer arm role prevents an impermissibly high Tensile force in the thread is induced by slippage, especially when Multiple wrapping the movement of the dancer arm to different Circumferential speeds of the wrapped roles leads.

In Fig. 3, a double counter-rotating dancer arm role is shown. The role 25.1, as previously described in FIG. 2, is fastened to a shaft 26.1, which in turn in the hollow cylindrical axis 29 through the bearings 28.1 is stored. The role 25.1 has an approach 30.1 to accommodate one Warehouse 28.2. The approach 30.1 is coaxial with the hollow cylindrical axis 29 arranged on the opposite side of the roller 25.1. The approach is, like the axis, hollow cylindrical so that a shaft 26.2 rotatably supported by the bearings 28.2 in the inner diameter of the approach is. The roller 25.2 is attached to the shaft 26.2. In this case own roll 25.2 has its own shaft 26.2, separate from roll 25.1, see above that both rollers can be rotated in the opposite direction of rotation. By this arrangement can advantageously multiple wraps in S or Z shape but also O-shape can be realized.

4, a triple counter-rotating dancer arm role is shown. The order the rollers 25.1, 25.2 and 25.3 are analogous to that in FIG. 3 described dancer arm role. In this respect, the description of Fig. 3 Referenced. Since all three roles separate shafts 26.1, 26.2 and 26.3, is a counter-rotating direction of any one Roll possible without an impermissibly high tensile force in the thread induce. It is arbitrary which of the three roles in the opposite Direction of rotation rotates and what speed difference between the rollers occurs. So can only role 25.2 or only role 25.3 or roles 25.2 and 25.3 are opposite to role 25.1 Have a sense of rotation.

The dancer arm rollers shown in FIGS. 2 to 4 are also used as thread guide rollers the thread guide 14 or 15 can be used.

The method according to the invention and the winding machine according to the invention show a considerable amount, especially when winding very fine threads improved coil structure and ensure, due to the constant Thread tension, avoiding damage to the thread by Overstretch.

REFERENCE SIGNS LIST

1

stand plate

2

thread

3

winding spindle

4

Kitchen sink

5

shell

6

casing

7

Traversing thread guide

8th

traversing

9

dancer

10

dancer arm

11

leadership

12

leadership

13

axis

14

thread guides

15

thread guides

16

axis

17

control device

18

spindle motor

19

rotation sensor

20

supporting role

21

carriage

22

carriage guide

23

Torque loading device

24

torque transmitter

25

Role, leadership role

26

wave

27

camp

28

camp

29

axis

30

approach

31

axis

32

Thread running groove

Claims (11)

1. Method for winding a thread (2) running at a constant speed to a bobbin package (4) by means of bobbin spindle (3) driven by a motor, in which the thread is fed to a transversing device (8) which displaces the thread back and forth along the surface of the bobbin transverse to its direction of travel, in which the thread is guided with a sag upstream from the transversing device via a dancer arm roll (10) arranged between two stationary thread guides (14, 15), the dancer arm roll being rotatably attached to the free end of a dancer arm (9) mounted on one side, in which the bobbin spindle speed is adjusted as a function of the position of the dancer arm by means of an adjusting device in such a way that the thread has a uniform sag between the stationary thread guides, a change in the sag causing a movement of the dancer arm with amplitude, characterised in that the thread repeatedly loops the dancer arm roll (10) in such a way that the amplitude of the dancer arm movement can be reduced proportionally to the number of loops, wherein the high-frequency oscillations of the dancer arm (9) occurring due to the transversing do not lead to adjustment of the spindle motor (18).
2. Method according to claim 1, characterised in that the thread (2) is repeatedly guided between one of the two thread guides (14, 15) and the dancer arm roll (10).
3. Method according to claim 2, characterised in that the thread guide (15) connected upstream from the transversing device (8) is repeatedly partially looped.
4. Winding frame for winding a thread (2) travelling at a constant speed to a bobbin (4), in particular for the application of the method according to claim 1 to 3, with a bobbin spindle (3) driven by a motor (18) to receive a bobbin tube (5), with a transversing device (8) for displacing the thread back and forth transverse to its direction of travel on the surface of the bobbin package, with a dancer arm (9) rotatably mounted on one side and with a dancer arm roll (10) arranged between two stationary thread guides (14, 15), which dancer arm roll (10) is arranged at the free end of the dancer arm (9) and has a thread running groove (32) formed to guide the thread, characterised in that a plurality of thread running grooves (32.1, 32.2) are formed parallel and adjacent to one another on the dancer arm roll (10), the thread (2) being repeatedly guided between one of the two or the two thread guides (14, 15) and the dancer arm roll (10) or an additional stationary thread guide and the dancer arm roll (10) and partially looping each of the thread running grooves (32.1, 32.2), wherein the high-frequency oscillations of the dancer arm (9) occurring due to the transversing, do not lead to the adjustment of the spindle motor (18).
5. Winding frame according to claim 4, characterised in that the dancer arm roll (10) consists of a plurality of rolls (25.1, 25.2) which are rotatable independently of one another, each having a thread running groove (32.1, 32.2).
6. Winding frame according to claim 5, characterised in that the rolls (25.1, 25.2) can be rotated in the same direction of rotation.
7. Winding frame according to claim 5, characterised in that adjacent rolls (25.2, 25.2) can be rotated in opposite directions of rotation.
8. Winding frame according to any one of claims 4 to 7, characterised in that the thread guide (14, 15) repeatedly looped by the thread (2) consists of a plurality of guide rolls (25.1, 25.2) formed from a respective thread running groove and arranged coaxially to one another.
9. Winding frame according to claim 8, characterised in that the guide rolls (25.1, 25.2) can be rotated in the same direction of rotation.
10. Winding frame according to claim 8, characterised in that adjacent guide rolls (25.1, 25.2) can be rotated in opposite directions of rotation.
11. Winding frame according to any one of claims 1 to 10, characterised in that the thread guide (15) connected upstream from the transversing device (8) can be repeatedly partially looped by the thread (2).

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