EP1175364B1 - Method and device for winding a continuously fed thread - Google Patents

Abstract

According to the invention, the thread is wound on a driven bobbin (7) to form a cross-wound bobbin (6), whereby the thread is guided in a to-and fro manner within a traversing stroke by a traversing thread guide. The length of the traversing stroke of the traversing thread guide can be changed within the bobbin width of the cross-wound bobbin. During winding (bobbin travel), the traversing stroke is changed between a maximum length (HAn) at the start of bobbin travel and a final length (HEn) at the completion of bobbin travel according to predetermined stroke function (F1, F2) such that, over the course of the bobbin travel, a determined length is assigned to each traversing stroke, whereby the lengths of the traversing strokes are smaller than the respective wound bobbin widths.

Description

The invention relates to a method for winding a continuously tapered Thread according to the preamble of claim 1 and a device for performing the method according to the preamble of claim 11.

When winding a thread into a package, the thread is inside the Coil width at a substantially constant peripheral speed of the coil placed at a crossing angle on the coil surface. This is the thread by a traversing thread guide before running onto the bobbin surface inside a traverse stroke back and forth. The length of the traversing stroke determines the coil width. There are basically two known ones Differentiated methods of forming a coil. In a first procedure the maximum length of the traversing stroke is not changed during the winding cycle. This will make a cylindrical cheese with a substantially right angle End faces wrapped. Here is the one set at the beginning of the winding trip Length of the traverse stroke is equal to the length of the traverse stroke at the end of the winding cycle.

In another known method, the traversing stroke is during the winding cycle constantly shortened. In this case a cylindrical cheese is used sloping faces. These so-called biconical coils are therefore to a normal plane, the slope angle is less than 90 °. The traversing stroke set at the end of the winding cycle has a length which is less than the length of the traversing stroke at the start of the winding cycle.

Regardless of the shape of the end face of the bobbin, the thread layers must be laid at the ends of the bobbin in such a way that no irregularities caused, for example, by exiting pieces of thread like that so-called thread cutters or sliding thread layers arise. In the EP 0 235 557 B1 proposes the traversing stroke during the To shorten and lengthen the winding cycle cyclically. This procedure is known as Breathing known. This ensures an even mass distribution to the Coil edges created so that no beads arise. This is when building a straight face after each breathing cycle the one set before breathing Length of the traverse stroke set again. When building a biconical After the breathing cycle, the coil becomes a slope angle Shortening of the basic traversing stroke set.

Furthermore, it is known from DE 37 23 524 that the end face of a coil is such to wrap that at the beginning of the winding trip one with a smaller slope angle wound base layer is built up first. Then the Spool travel continued with a smaller shortening of the traversing stroke.

From DE 35 05 453 A, which corresponds to the preamble of claim 1, a method for winding threads is known from which the traversing stroke is temporarily reduced during winding. Such brief repetitive changes in the traversing stroke, including breathing are used to improve the local coil structure, but can affect the overall shape of the coil little.

From DE 198 07 030 A a device is known which corresponds to the preamble of claim 11.

In practice, especially when textured threads have been wound up a high curl showed that especially in the central region of the coil bulge-like bulges occur on the end faces at high drain speeds cause malfunctions in further processing.

It is accordingly an object of the invention to provide a method of the aforementioned Kind as well as an apparatus for performing the method to create that Allows winding of a package with essentially straight end faces.

This object is achieved according to the invention by a method with the features according to claim 1 and by a device with the features according to claim 11 solved.

The invention is characterized in that all the layers of threads lying one above the other a package can be included in the design of the end faces. The invention breaks with the prejudice that during winding up to produce the traverse stroke of a right-angled or inclined face of the coil is to be changed proportionally to the bobbin width during the bobbin travel. It was found that the formation of the end face of the cheese through not alone the lengths of the traverse stroke set during winding (winding travel) is determined, but rather by cooperation after completion of the coil of all layers of threads lying on top of each other. In particular Changes were found in the middle diameter range of the coil. Such changes in shape are taken into account by the method according to the invention, by changing the lengths of the traverse stroke during the winding travel a specified lifting function can be changed. The lifting function gives the Relationship between the rewind caused by the winding time or the Coil diameter can be defined, and the lengths to be set in each case of the traverse stroke. Here, in the course of the winding cycle through the lifting function a certain length is assigned to each traversing stroke, the lengths of the Traversing strokes are smaller than the respective wound coil widths. So can the stroke function can also be viewed as a measure of the difference between the later spool width and the length of the traversing stroke. For education rectilinear end faces serves a lifting function, in which at the beginning of the Winding travel a constant shortening of the traversing stroke relative to the bobbin width and at the end of the winding cycle, a constant extension of the traversing stroke relative to At the end of the winding cycle, a constant extension of the traversing stroke relative to the bobbin width is specified. The largest are in the middle Deviations between the spool width and the length of the traversing stroke.

The traversing stroke changes specified by the lifting function over the winding travel are essentially of the parameters such as thread tension Crimping of the thread, the thread titer, the bobbin density and the thread deposit, which is defined by the crossing angle and the thread reversal. So the connection has turned out, for example, a textured Thread with a relatively low crimp needs a lifting function, the larger one Deviation between the coil width and the length of the traversing stroke in shows the central area of the coil. In contrast, there is a winding of a coil with very high coil density, only a slight deviation between the coil width and the length of the traversing stroke.

In a particularly advantageous development of the invention during the Each wound bobbin diameter has a certain length of winding travel Changierhubes assigned. This allows a very precise geometric shape produce and reproduce the package.

In the case of packages that do not have a preferred thread guide in further processing are subject, the method variant according to claim 2 is particularly advantageous. The lifting function makes both end faces of the package even wound.

In order to have the best possible running properties in a further processing process The method variant is to enable the thread to be drawn off from a bobbin preferably used according to claim 3. Both can The end faces have different shapes.

Since a lifting function each has a maximum set at the beginning of the winding travel Length of the traverse stroke and one set at the end of the winding travel End length of the traversing stroke is the stroke function for a final diameter or specified an angular position (slope angle). Especially at the production of biconical coils, it is therefore particularly advantageous if a lifting function for each wound end diameter of a package is assigned, which has a certain slope angle on at least one end face of the cheese.

Likewise, a change in the winding of biconical coils Slope angle so that the end length of the traversing stroke changes at the same time must become. The method variant according to claim 5 is special for this can be used advantageously. Each angle of repose of the cheese is in each case assigned a lifting function. Each of the lifting functions is specific to one Final diameter of the package fixed.

When winding cross-wound bobbins with an end face that has an angle of 90 ° has, the maximum length of the traversing stroke at the beginning of the winding travel and the end length of the traversing stroke at the end of the winding cycle is given the same size. In contrast, by shortening the final length of the traversing stroke set any slope angle on the front of the coil.

In a particularly advantageous method variant, the lifting function in stored and stored in a control device. The control device is with connected to the drive of the traversing thread guide, the drive performing the traversing movement and affects the traversing stroke of the traversing thread guide. The The lifting function could, for example, by means of a time program in the control device lead to a constant or inconsistent change in the traversing stroke.

In order to obtain the most precise possible structure of the coil, the method variant is according to claim 8 particularly advantageous. The actual diameter is continuously updated the coil is determined so that the drive by the control device with the length of the traverse stroke specified for the current spool diameter is controlled.

The method according to the invention is independent of the type of winding. As The types of winding apply to wild winding, precision winding or Step precision winding. The mean value of the traversing speed remains with the game winding essentially constant during the winding cycle. in this connection the winding ratio (spindle speed / traversing speed) changes in Continuous course of winding. With a precision winding, the winding ratio kept constant. With a step precision winding, however, the winding ratio changed in stages according to a given program.

It is also particularly advantageous to use the known method in accordance with the invention Mirror disorder procedures or known breathing procedures to combine. It can be used for packages with large diameter and large Spool length can be produced at high take-off speeds of far Over 1,000 m / min and more, the thread runs smoothly overhead guarantee.

The device according to the invention for performing the method draws are characterized by a high flexibility in the manufacture of the coils. Leave here both the angle of repose for biconical coils and the final diameter of the coils vary slightly. The control device goes with the specification of the traversing stroke from a current actual diameter of the coil. For this purpose, the control device is used to detect the speed of the sleeve Sensor connected. There are one or more lifting functions in a data memory deposited. Likewise, the winding speed is a known variable in the Control device saved. By means of an arithmetic unit, this can be done directly from the speed of the core and the winding speed of the current one Calculate the coil diameter. Through the lifting function, which is based on a Table of values for each coil diameter a specific one optimized for the process Assigning the length of the traverse stroke is the setting length of the traverse stroke certainly. The drive of the traversing thread guide is thus via the control device controlled at all times during the winding cycle with an optimal traverse stroke.

The flexibility of the device is due to the particularly advantageous development the invention according to claim 12 increased. Here, the traversing thread guide by means of a motor, in particular a stepper motor. This makes it possible to change the traversing speed with the respective Coupling the change in length of the traversing stroke. A shortening of the traversing stroke can therefore be used at a constant traversing speed or at a constant speed Thread quantity done per time.

The coupling between the traversing thread guide and the motor is advantageous designed as a belt drive. For this purpose, the motor has a drive pulley on which drives a belt guided over at least one pulley. On the traversing thread guide is attached to the belt and is within the winding width moved back and forth.

The sleeve is used to obtain a uniform winding speed or the coil advantageously by a contact with the circumference of the sleeve or the coil Driven roller driven. For this purpose, the sleeve is on a coil holder between two centering plates clamped, the sensor for sensing the speed the sleeve is arranged on the coil holder.

It is particularly advantageous here if the sensor as a pulse generator is executed. The pulse thus signals a revolution of the speed and a zero position of the coil. However, it is also possible to have multiple markings to make on one of the clamping plates, so that several per revolution Impulses are signaled.

The development of the invention according to claim 15 also has the advantage that in addition to the speed of the coil and the angular position of the Coil emerges. So there is the possibility of thread reversal in the individual Distribute thread layers evenly around the circumference of the bobbin.

Further advantageous developments of the invention are dependent in the rest Defined claims.

The method and the device for performing the method are based on some embodiments in the following with reference to the accompanying Drawings described in more detail.

Fig. 1

schematisch einen Halbschnitt einer fertig gewickelten bikonischen Kreuzspule;

Fig. 2

schematisch einen Halbschnitt einer Kreuzspule mit rechtwinkeligen Stirnseiten;

Fig. 3

schematisch eine erfindungsgemäße Vorrichtung zur Durchführung des Verfahrens;

Fig. 4

schematisch die Steuereinrichtung der Vorrichtung aus Fig. 3.

They represent:

Fig. 1

schematically a half section of a finished wound biconical cheese;

Fig. 2

schematically shows a half section of a cheese with right-angled faces;

Fig. 3

schematically an inventive device for performing the method;

Fig. 4

schematically the control device of the device from FIG. 3.

In Fig. 1, a half section of a biconically wound cheese is shown schematically. The cheese 6 is wound on a sleeve 7. The coil has a maximum coil width B _max on the sleeve surface. The coil diameter is entered on an ordinate in the illustration in FIG. 1. The cheese has the final diameter D _En . The end faces 22 and 23 are each inclined with a slope angle α. For this purpose, the traversing stroke was wound with a maximum length H _An at the beginning of the winding cycle. The maximum length of the traversing stroke corresponds to the maximum spool width on the surface of the sleeve 7. At the end of the winding travel, the traversing stroke is set with a shortened length H _En . The slope angle α is determined by the end length H _{EN of} the traversing stroke and the maximum length H _{An of} the traversing stroke. In order to obtain a straight end face 23, the length H of the traversing stroke was changed during the winding travel according to a predetermined stroke function F ₁ . The stroke function F ₁ is shown in dashed lines in FIG. 1 next to the end face 23. The course of the lifting function over the spool diameter shows a deviation from the spool width. At the beginning of the winding cycle, the length of the traversing stroke H is reduced. After a coil diameter D _{U has been reached} , there is no further reduction in the traversing stroke. The traversing stroke is continuously extended after winding the bobbin diameter D _U according to the lifting function F ₁ , so that the end length H _En of the traversing stroke is set at the end of the winding cycle for the end bobbin diameter. At the end of the winding cycle, the coil wound according to the lifting function F ₁ thus results in the end face 23 shown in thick line in FIG. 1. Thus, the bulging occurring in a coil is specifically influenced in such a way that a straight end side results.

At the opposite end of the bobbin, the thread is reversed during the bobbin travel according to the lifting function F ₂ . The lifting function F ₂ is identical to the lifting function F ₁ , so that the traversing stroke is shortened and lengthened evenly at both coil ends. The end face 22 is thus formed symmetrically to the end face 23.

The stroke function F in this case represents the dependence of the traversing stroke on Coil diameter represents. So here each coil diameter during the Spool trip assigned a certain length of the traversing stroke. However, it is also possible to specify the lifting function depending on the winding time. In In this case, a certain traverse stroke length would be assigned to each winding time.

In Fig. 2, another embodiment of a wound coil is shown in half section. The coil 6 is wound on the sleeve 7. The coil diameter D is plotted on an ordinate perpendicular to the sleeve surface. The coil 6 has a final diameter D _En after completion. In this embodiment, the coil 6 has two differently designed side surfaces 23 and 22. The side surface 23 is formed at right angles with an angle of repose α ₁ = 90 °. The opposite side surface 22 is also wound with a slope angle α = 90 ° at the beginning of the winding trip. Shortly before the end of the winding cycle with the bobbin diameter D _B , the slope angle has changed from the angle α ₁ to the angle α ₂ less than 90 °.

In order to obtain the end faces 23 and 22 shown in FIG. 2 after completion of the coil, the end face 22 is wound according to the lifting function F ₁ and the end face 22 according to the lifting function F ₂ . The changes in the traverse stroke over the diameter are shown in dashed lines. Here, the traversing stroke is set with a maximum length H _An at the beginning of the winding cycle. As the winding progresses, the traversing stroke is first reduced at both coil ends in accordance with the lifting functions F ₁ and F ₂ . In the middle diameter range of the bobbin, the traversing stroke is extended in accordance with the stroke functions F ₁ and F ₂ until the length H _En of the traversing stroke is reached at the end of the winding cycle. The shortening and lengthening of the traversing stroke during the winding travel are predetermined on both sides by the lifting functions F ₁ and F ₂ , which, taking into account the thread parameters and the winding parameters, leads to the desired shaping of the end faces. Basically, the traversing stroke changes over the winding travel to produce a straight-line biconical or straight-line right-angled end face are predefined in such a way that the thread tension during winding, the crimping of the thread, the bobbin density and the thread deposit in combination lead to the desired shape of the end faces. The method according to the invention is characterized in that it uses changes in shape of the coil in a targeted manner in order to produce an optimal geometric shape of the coil.

3 shows an embodiment of a device according to the invention, as it can be used for example in a texturing machine. On the free ends of a fork-shaped coil holder 21 are two opposite one another Centering plate 8 and 9 rotatably mounted. The coil holder 21 is on one Swivel axis (not shown here) pivotally mounted in a machine frame. Between the centering plates 8 and 9 is a sleeve 7 for receiving a Coil 6 excited. One lies on the surface of the sleeve 7 or the coil 6 Driving roller 5 on. The drive roller 5 is fixed on a drive shaft 11. The Drive shaft 11 is coupled to roller motor 10 at one end. The Roller motor 10 drives the drive roller 5 at a substantially constant speed on. The sleeve 7 or the coil 6 is now moved by means of the friction Driving roller 5 driven at a winding speed which is a winding of a thread 1 with a substantially constant thread speed. The winding speed remains constant during the winding cycle.

A traversing device 2 is arranged in front of the drive roller 5. The traversing device 2 is constructed as a so-called belt traverse. Here is a traversing thread guide 3 attached to an endless belt 16. The belt 16 will guided parallel to the sleeve 7 between two pulleys 15.1 and 15.2. In the Belt level is a drive pulley 14 partially wrapped by the belt parallel arranged to the pulleys 15.1 and 15.2. The drive pulley 14 is on a drive shaft 13 of a motor 12 attached. The motor drives the drive pulley 14 oscillating so that the traversing thread guide 3 in the area between the pulleys 15.1 and 15.2 is guided back and forth. The engine 12 can be controlled via a control device 4. The control device 4 is connected with a arranged on the coil holder 21 sensor 17, which the The speed of the sleeve 7 is detected and given as a signal from the control device 4.

In this exemplary embodiment, the sensor 17 is designed as a pulse generator, who senses a catch groove 19 in the centering plate 8. The catch groove 19 belongs to a catching device 18 which catches and catches the thread 1 at the beginning of the winding travel Wrapping the thread on the sleeve 7 allows. The sensor 17 is pro Revolution a signal depending on the recurring catch groove 19. These pulses are in the control device for evaluating the location and the speed of the sleeve 7 converted. The sleeve 7 is between the centering plate 8 and 9 clamped that the centering plate 8 and 9 without slipping with the Rotate the speed of the sleeve.

In the situation shown in FIG. 3, a thread 1 is wound onto the cheese 6 the sleeve 7 wound. The thread 1 is in a guide groove of the traversing thread guide 3 led. The traversing thread guide is within the winding width guided back and forth by the traversing device 2. Here are the movement and the traversing stroke length by the motor 12, for example as a stepper motor could be specified. The growing coil diameter of the Cross-wound bobbin 6 is made possible by a pivoting movement of the bobbin holder 21. For this purpose, the coil holder 21 has force transmitters (not shown here) that on the one hand a contact pressure required to drive the coil between the Generate coil 6 and the drive roller 5 and on the other hand a pivoting movement enable the coil holder 21.

The traversing speed of the traversing thread guide 3 and the length of the The traversing stroke is predetermined by the control device 4, which leads to a corresponding one Control of the motor 12 leads. To control the control device 4 the lifting function F and the winding speed V are given up. As shown in FIG. 4, the control device 4 has a data memory for this purpose 24 on. In addition to the lifting function F and the Winding speed other control programs stored. As an an example 4 the traversing speed DH in the form of the number of double strokes supplied to the data memory 24 per unit of time. In the control device 4 is at least one computing unit 25, which is connected via a signal line from the sensor 17 continuously receives the current speed u of the sleeve 7. In the computing unit 25 is then based on the winding speed stored in the data memory 24 v and the speed u the respective current coil diameter D from the relationship D = v / (π * u) calculated. The determined coil diameter D and the lifting function F are given to a comparator 26, which corresponds to the current Coil diameter associated length of traversing stroke determined. This The length of the traversing stroke H is then given to a control unit 27. The Control unit 27 is coupled to motor 12 and carries out a corresponding one Activation of the motor. At the same time, the control unit 27 carries out the Specification of the traversing speed or the specification of control programs for mirror disorder or breathing. Such control programs can also depending on the respective coil diameter.

The device according to the invention is characterized by high flexibility and high precision when winding the spool. This is achieved that the current bobbin diameter is known at all times during the winding cycle is and therefore a very precise control of the traversing stroke for shaping the coil is made possible during the winding trip.

LIST OF REFERENCE NUMBERS

1

thread

2

Traversing device

3

Traversing thread guide

4

control device

5

drive roll

6

cheese

7

shell

8th

centering plate

9

centering plate

10

roller motor

11

drive shaft

12

engine

13

drive shaft

14

sheave

15

pulley

16

belt

17

sensor

18

catcher

19

catching groove

20

thread reserve

21

spool holder

22

front

23

front

24

data storage

25

computer unit

26

comparator

27

control unit

Claims (15)

1. Method of winding a continuously advancing yarn (1) to a cross-wound package (6), wherein the yarn (1) is reciprocated by means of a traversing yarn guide (3) within a traverse stroke, and deposited on the package, wherein the traverse stroke of the traversing yam guide (3) is variable in its length within the package width of the cross-wound package (6), and wherein at the beginning of the winding a maximum length of the traverse stroke is predetermined and at the end of the winding an end length of the traverse stroke for defining an angular position of the cross-wound package which is to be formed with straight-bordered end faces, characterized in that the length of the traverse stroke is varied during the winding between maximum length of the traverse stroke and end length of the traverse stroke by a predetermined stroke function (F) which associates each wound package diameter or each point of time corresponding to the wound package diameter to a determined length of the traverse stroke, said length of the traverse stroke of each package diameter being smaller than the formed package width of the cross-wound package (6) with the respective diameter and having straight-bordered end faces (22, 23), wherein the stroke function (F) predetermines a continuous shortening of the traverse stroke relative to the package width at the beginning of winding and a continuous lengthening of the traverse stroke relative to the package width at the end of winding, so that the largest variation between the package width and the length of the traverse stroke arise in the middle stage.
2. Method according to claim 1, characterized in that the stroke function (F) effects on the end faces (22, 23) of the cross-wound package (6) a symmetrical shortening and a symmetrical lengthening of the traverse stroke.
3. Method according to claim 1 or 2, characterized in that the stroke function (F) effects on the end faces (22, 23) of the cross-wound package (6) an asymmetrical shortening and an asymmetrical lengthening of the traverse stroke.
4. Method according to one of the foregoing claims, characterized in that respectively one stroke function (F) is associated to each wound end diameter of the cross-wound package, the stroke function (F) resulting in a certain angular position on at least one face end (22, 23) of the cross-wound package (6).
5. Method according to one of the foregoing claims, characterized in that respectively one stroke function (F) is associated to each wound angular position of the cross-wound package (6), the stroke function (F) resulting in a certain end diameter of the cross-wound package (6).
6. Method according to one of the foregoing claims, characterized in that the maximum length and the end length of the traverse stroke are identical at an angular position of 90°, and that at an angular position smaller than 90° the maximum length is greater than the end length of the traverse stroke.
7. Method according to one of the foregoing claims, characterized in that the traversing yam guide (3) is driven by a controllable drive, which connects to a controller (4), and that the stroke function (F) or functions is or are stored in the controller (4).
8. Method according to claim 7, characterized in that the rotational speed of the cross-wound package (6) is measured and supplied to the controller (4), that the controller (4) determines the instantaneous package diameter from the rotational speed of the cross-wound package (6) and the winding speed, so that the controller (4) controls the drive with the length of the traverse stroke, which is predetermined for the instantaneous package diameter.
9. Method according to one of the foregoing claims, characterized in that during the winding, the traversing speed is variable by a predetermined control program.
10. Method according to one of the foregoing claims, characterized in that during the winding, the traverse stroke is periodically variable by a predetermined stroke modification function.
11. Device for carrying out the method of one of claims 1-10, with a driven tube (7), on which a yam (1) is wound within a package width (B) to a cross-wound package (6), with a movable traversing yam guide (3), which is adapted for reciprocal movement by a drive (12) within a traverse stroke, which is variable in its length, and with a controller (4) for controlling the traverse drive, wherein the controller (4) connects to a sensor (17), which measures the rotational speed of the tube (7), that the controller (4) possesses a data storage (24) for receiving at least one stroke function (F) and a winding speed (v), wherein the controller (4) is connected to the drive (12) of the traversing yarn guide (3) to control a length of the traverse stroke, which is predetennined by the stroke function (F), characterized in that the controller (4) comprises a computing unit (25) for determining the instantaneous package diameter (D), and that the length of the traverse stroke is so affected that each wound package diameter (D) or each point of time corresponding to the wound package diameter (D) is associated to a determined length of the traverse stroke, said length of the traverse stroke of each package diameter being smaller than the formed package width of the cross-wound package (6) with the respective diameter and having straight-bordered end faces (22, 23), wherein the stroke function (F) predetermines a continuous shortening of the traverse stroke relative to the package width at the beginning of winding and a continuous lengthening of the traverse stroke relative to the package width at the end of winding, so that the largest variation between the package width and the length of the traverse stroke arise in the middle stage.
12. Device according to claim 11, characterized in that the drive of the traversing yam guide (3) is a motor (12), in particular a stepping motor, which controls the traversing movement and the traverse stroke of the traversing yarn guide (3), and is activatable by the controller (4).
13. Device according to claim 12, characterized in that the motor comprises a drive pulley (14), which drives a belt (16) that advances over at least one belt pulley (15), with the belt (16) mounting the traversing yarn guide (3).
14. Device according to claims 11-13, characterized in that the tube (7) is clamped between two centering plates (8,9) arranged on a package holder (21), and that it is driven by a drive roll (5) in circumferential contact with the tube (7)/package (6), with the sensor (17) being arranged on the package holder (21).
15. Device of claim 16, characterized in that the sensor (17) is a pulse transmitter, which signals to the controller (4) a revolution of the centering plate (8) by a pulse, and that the controller (4) comprises a counting unit, which determines the rotational speed of the tube (7) from the number of pulses per unit time.

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