EP0009218B1 - Method of and device for depositing travelling filamentary or fibre strands - Google Patents

Description

The invention first relates to a method for depositing running filament or fiber cables, in which the goods, which are preferably delivered at high speed, are fed from a delivery device, then decelerated with respect to its straight-line movement by moving into a winding position by means of two at a distance parallel to each other, shifted away from each other, but still partially overlapping wheels, on the sides of which axially aligned pins are fastened overlapping one another as deflection members, is deflected into a zigzag position, then the turns are then immediately released again by the deflection members and thus be fed to a storage device in free fall according to the loop speed.

The technical development in the spinning of fiber cables runs in the direction of ever higher delivery speeds of the spinning cable from the spinning machine. As a result, however, the storage of the spinning cable in a storage jug becomes an ever greater problem, in particular because cable speeds of up to more than 6000 m / min are conceivable.

DE-A-2 261 366 discloses a method according to which the speed of the fiber cable is reduced by braking the fiber cable with respect to its rectilinear movement in such a way that it can be safely placed in a can. The cable is fed into moving conveyors, the speed of which is lower than the cable speed. In particular, a device is then known which consists of two cooperating conveyor rollers which can be moved in the opposite direction of rotation and in which essentially radial webs are arranged on the lateral surface at the same distance. In this and in all other examples, however, the fiber cable meets the fiber cable stacked in the conveying member in the direction of its axis, where it is forced by compression to form folds which are arbitrary. Therefore it is impossible to avoid splaying of the fiber cable and confusion in the cable. These changes in cable cohesion cannot be prevented if several braking stages are used in succession.

An advantageous solution to the problem is provided by the device according to EP-A-9162, which works according to the method initially mentioned. It is essential in this process that the cable is guided continuously during the formation of folds and that the fold position and size are exactly determined by the deflection elements. For this reason, there can be no changes in the cable cohesion when folding, on the contrary, if the cable should have become slightly voluminous due to the upstream conveying elements, it is brought together again by the deflecting elements acting one after the other in the cable.

With the device according to EP-A-9 162, it is possible to brake the cable to be laid down to zero in the can. However, with a high delivery speed of the cable, this means that, depending on the length of the folds, they fall towards the can at a relatively high falling speed. Although this falling speed does not result in any changes in the cohesion of the cable to be laid, changes in the laid cable mass can result.

For the sake of completeness, reference is also made to US Pat. No. 3,256,134, from which two cooperating but angularly aligned wheels are also known, which have axially projecting disks on their circumference, which are in gap with the disks of the other wheels and interlock. Due to the slight angular position of the one to the other wheel, the discs slowly merge on one half and slowly diverge again after 180 ° C. The textile material fed to the disks, such as yarn, is thereby forced into many small folds, is subjected in this position to a heat treatment to develop the yarn, and is then stretched off again in order to subject it to further treatment, such as processing.

On the basis of the method mentioned at the beginning, the object of the invention is to develop an additional method for storing goods, with which any changes in the cable cohesion, in particular also in the goods already stored, are avoided. The device for carrying out the method is to be improved overall, not only to be supplemented, in order to obtain a device which is always functional, easy to operate and in particular easily accessible in practice.

On the basis of the method mentioned at the beginning, the invention provides, in order to achieve the object, that the material, placed in uniform zigzag turns, be shifted closer to each other at least once before final storage. The purpose of this is not to increase the number of folds in order to reduce the depositing speed, but rather only to fold the folds closer together, which automatically results in a low falling speed of the cable into the can.

To protect the cable, it is expedient if the deflection elements exert a not too great longitudinal tension on the cable when the folds are formed. It is therefore advantageous to guide the cable between the delivery device and the fold-forming member by means of additional conveyance. This causes the product to be fed into the wrinkling organ with little tension.

The device for carrying out the method consists first of all of the pair of wheels known from EP-A-9 162 with two spaced-apart parallel, mutually displaced, but still partially overlapping wheels, on the sides of which axially aligned pins as Deflection devices for the material to be laid in turns are attached to one another. If, by means of this device, approximately horizontally extending folds are fed to the can, it is advantageous if the turns come to rest close to one another. It is therefore envisaged to arrange an organ that adjoins this winding formation element in front of the depositing device and that accommodates the windings in their laid width as the upsetting device that places the windings closer together. A chute, a driven revolving transport roller or an endless belt would be conceivable as the upsetting device. Here, too, it is advantageous or even necessary to brake the falling speed of the turns on the upsetting device to zero. Therefore, the transport roller with its horizontally aligned axis should be arranged vertically below the windings flying towards the roller. The fold that has just been deposited is then removed from the point of impact by the rotation of the transport roller and is thus conveyed in the direction of the can. So the successive turns cannot collide.

Since the windings strike the upsetting device at a certain speed, it can be advantageous to support the release of the turns from the upsetting device. It is therefore expedient to assign a stripper to the upsetting device, in particular the conveyor device. For this purpose it is advisable to provide the transport roller with circumferentially parallel grooves in which a finger-shaped cable wiper engages. In this way, the capillaries lying directly on the roller are reliably detected by the stripper.

As is known from DE-A-2 704 866, the transport roller can be designed as a suction drum under suction. Likewise, as is known, the conveying device can oscillate in order to influence an even filling of the can. In the present case, it is expedient to design the conveyor to be movable about an axis perpendicular to the roller axis so that the point of impact of the turns on the roller remains the same.

The device according to EP-A-9162 consists of two wheels, the deflection pins being attached to the spokes of these wheels. However, it is more advantageous to form the pair of wheels from two disks arranged slightly apart from one another and displaced parallel to one another with a pin length of more than one pin. This offers considerable advantages in terms of fastening technology compared to a pair of spoke wheels.

Since it is possible to work with a relatively small pinwheel diameter and a constant change in the engagement, for example to change the pretension of the cable, is not necessary, the pinwheels can be mounted on two intermeshing gearwheels, one of which is driven by a controllable motor. If the wheels are equipped with different perforated rings, the engagement and loop length can be changed by reassembling the pins according to the radii and divisions of the perforated rings.

It is also advantageous to provide the pair of wheels with an additional conveying device, e.g. pre-arrange an injector nozzle, a pair of reel sprockets, pins or gears; because it would not be a good thing if the pair of pinwheels had to build up a substantial tension to the pull-off unit. With the interposition of an injector nozzle, it is also possible to maintain the pull-off voltage from the pull-off required to avoid winding. At the same time, the tension between the nozzles and the pin wheels is set as low as desired. The otherwise damaging effect of the injector nozzle, which can destroy the cohesion of the cable, is ineffective here, since the cable is brought back together in an orderly manner on the pair of pin wheels.

Inserting the cable is particularly easy if the pins of one pin wheel, e.g. 10-15 mm longer than that of the other pin wheel. You can then guide the cable picked up with a suction nozzle all the way around the pin wheel without the cable coming into contact with pins of the other wheel. If you then move a thread guide attached shortly before the pin wheel into an end position (thread guide approximately in the middle of the interlocking pins), the cable automatically threads itself.

Whichever cross-section the cable is given by a thread guide in front of the pinwheel pair, by sliding around the pins the cable cross-section inevitably becomes band-shaped, gradually becoming somewhat wider depending on the pressing force and the number of wrapped pins. However, a round, closed cross-section is advantageous for the storage and the pulling out of the storage can, otherwise it could lead to vagabond single capillaries. According to the invention, this can be achieved by a groove in the pins. Cable routing and cable cross-section are particularly good if the grooves have sloping flanks on the outside and almost vertical flanks on the inside. The excellent cable routing allows you to work with relatively short pins. A groove of about 2-3 mm total depth and 3-4 mm inner width is sufficient for the usual cable thicknesses. The cable guide in front of the pin wheels, e.g. B. two parallel rods, then advantageously has a slot width that is slightly smaller than the groove width on the pins. This ensures that no individual capillaries run outside the pin grooves.

If larger loop lengths are required for a strong reduction in the spinning speed, the number of pins around which the cable must slide and / or the engagement of the pin wheels must be selected to be larger. With more than 4-5 pins, this can lead to a considerable increase in the frictional forces that stress the cable. As is known, it is then expedient to provide the pins with slide or ball bearings which reduce the frictional forces to harmless amounts. If a tension is to be built up between the pin wheels and the trigger at the same time, the setting of this tension can become critical with high friction values. It can be useful here not all pens, but e.g. only every second pin, to be provided with slide or ball bearings. It is also possible to reduce these forces in that one pin wheel has only half the number of pins on the other wheel or generally an integral fraction of the pins on the other wheel.

It is particularly expedient to operate the laying system with only a slight pretension, since then the pressure forces dependent on the cable cross section also become small and the greatest protection of the cable is achieved. In addition, it is then particularly easy to let the pair of pin wheels run slowly according to the folding.

As already mentioned, this can be achieved by using e.g. an injector nozzle or a small pair of pinwheels or gearwheels with a relatively small number of pins or teeth and a small loop length is switched on, which supplies the necessary pull-off voltage for pre-pulling. The small pair of pinwheels must then rotate at about the spinning speed in order to achieve the required tension for pulling off. The cable is then routed loosely or in a free-hanging loop of a thread brake, which ensures a low pre-tension of the cable entering the pair of storage pinwheels.

In the drawing, embodiments of the device according to the invention are shown.

• Fig. 1 in der Frontansicht eine Faltvorrichtung mit darunter angeordneter Kanne,
• Fig. 2 die Einrichtung nach Fig. 1 in der Seitenansicht,
• Fig. 3 in vergrösserter Darstellung die unterhalb der Falteinrichtung angeordnete Förderwalze in der Ansicht,
• Fig. 4 einen Schnitt quer durch die Vorrichtung nach Fig. 3;
• Fig. 5 die Draufsicht auf die Walze nach Fig. 3 in verschiedenen Winkelstellungen,
• Fig.6 die Frontansicht ähnlich der nach Fig. 1 mit einer vorgeschalteten Zwischenablage,
• Fig. 7 die Stirnansicht der Falteinrichtung in anderer Ausgestaltung wie Fig. 2 und
• Fig. 8 eine Ausschnittvergrösserung eines Stiftes nach Fig. 7

Show it:

• 1 is a front view of a folding device with a jug arranged underneath,
• 2 shows the device according to FIG. 1 in a side view,
• 3 shows an enlarged view of the conveyor roller arranged below the folding device,
• FIG. 4 shows a section across the device according to FIG. 3;
• 5 shows the top view of the roller according to FIG. 3 in different angular positions,
• 6 shows the front view similar to that of FIG. 1 with an upstream clipboard,
• Fig. 7 is an end view of the folding device in a different embodiment as Fig. 2 and
• 8 shows an enlarged detail of a pin according to FIG. 7

The spinning cable 1 coming from the spinning machine is fed to the driven rotating pin wheels 3 and 4 via the pull-off 2. The pin wheels consist of two axially parallel disks or wheels, which have the same number of axially parallel pins a "a2 .... b" b ₂ ... arranged around their circumference. The pin wheels 3 and 4 are arranged so that the wreaths formed by the pins face each other and interlock. The pins are arranged such that, for example, a pin b of the wheel 4 is in the gap between the pins a and a _{2 of} the wheel 3. When the two wheels 3 and 4 are driven synchronously, the pin rings then always run cross-wise without the pins touching one another.

The cable can be easily threaded to operate the device. When brought into contact with the pins running towards one another, the cable 1 automatically zigzags around the pins, each time outside around the pins, as seen from the associated wheel axle. If the cable 1 has passed the middle of the engagement of the pin wheels, it no longer has any folding forces acting on it. Under the influence of the centrifugal force, the cable detaches from the pins while maintaining the loop shape and leaves the pair of pin wheels in this loop shape. Loop angle and loop length are determined by the engagement of the pin wheels. In any case, this should be more than 10 mm. With these pin wheels, interventions of 50 mm and more can be easily adjusted with the correspondingly large loop lengths, without there being a risk of pinching the cable.

1, 2, the folded cable leaving the pin wheels 3 and 4 falls onto a rotating roller 5, which is arranged exactly below the falling cable turns and whose axis is perpendicular to the axes of the pin wheels. The sudden braking of the folds onto the roller 5 does not damage the fiber cable, since the impact occurs perpendicular to the longitudinal direction of the individual capillaries of the fiber cable. Depending on the speed of rotation of the roller 5, the pleats are simultaneously laid, so that the individual capillaries of a loop lie on one another at the final laying angle after being folded. This prevents confusion of the cable and an inadmissible shifting of the cable that has already been deposited.

The folded cable now leaves the roller under the action of centrifugal force and gravity, preferably with the help of an additional scraper 6, and falls at a normal rate of fall, possibly in a slight arc, into the storage can 7 below.

The loop speed _Vs after leaving the pin wheels depends on the delivery speed. B. from the spinning speed v _a , the number of pins and the engagement of the pin wheels. For example, if the pin wheel diameter is 25.2 cm, each wheel has 24 pins with a diameter of 10 mm and if the engagement is 15.3 cm, it is quick speed of the loops in relation to the delivery speed vs .: 0.17 v _a .

With a delivery speed of 4000 m / min, this corresponds to a loop speed of v _s .: 680 m / min or a number of revolutions of the pin wheels of just under 500 rpm.

A simple calculation shows that the effective speed of the cable loops that can finally be achieved after leaving the roller 5 is only a fraction of the loop speed _Vs after leaving the pin wheels. If 2L is the length of the cable in the loop and a is laid on the roller with the peripheral speed u, then the relationship is: u = (a / 2L) v _s . For example, if the length of the loop is L = 5 cm, the laying a = 0.7 cm, corresponding to an intersection angle of approximately 10 °, u = 0.07 v _s , that is less than 1/10 of the loop speed.

When designing the wheels, it is important that the pins do not touch during the engagement and leave enough space for the cable between them. In the above example, there is a minimum distance of 8 mm between adjacent pins. Approximately the same ratio can also be achieved with a pair of pinwheels with a diameter of 25.2 cm, an engagement of 9 cm and pins with a cross-sectional dimension of 4 x 8 mm; the minimum distance of 8 mm is also observed here.

The cable 1 can be fed to the pinwheel pair as desired. It can be done by placing the cable around the pins of one wheel as shown. There is then a relative movement between the pins and the cable. The cable will slide on it, but this is of no significant importance. However, it may be expedient to immediately arrange an additional conveying device, such as an injector nozzle, to the pair of wheels 3, 4 in order to favorably influence the low-tension feed of the cable into the pair of wheels 3, 4. The conveyor can also be arranged so that the cable is inserted immediately between the interlocking pins. Using an injector nozzle as a conveying device is possible without disadvantage since any inflation of the cable in the pair of pinwheels is reversed.

The roller 5 is advantageously designed as a grooved roller (FIG. 1) into which the finger-shaped wiper 6 engages. This means that individual capillaries adhering to the roller surface can be lifted off the roller surface undamaged since they are perpendicular to the wiper in accordance with the loop direction. A rotating belt with a scraper or a suction drum under suction can also take the place of the roller.

In order to achieve a more even can filling, an additional traversing of the loop cable can be advantageous. It can be achieved very simply by setting the roller 5 in a periodic, reciprocating rotary movement about an axis perpendicular to the roller axis (FIG. 5). The loop cable leaves the roller in the direction of the centrifugal force, the direction of which is continuously changed by the rotation, so that the cable oscillates.

The tape folding described by pin wheels has the decisive advantage over a gear rack that pinch points in the cable can no longer occur. The adjustment of the wheels to certain loop lengths is not critical. It is done by adjusting the engagement of the two pin rings. With the engagement of the two pin wheels and their peripheral speed, the tension of the running cable between the pin wheels and the pull-off can be adjusted.

Since, apart from the pins, no other component protrudes into the path of the cable, it is also possible to significantly reduce the diameter of the pin wheels compared to those of the conventional gear wheels. This brings technical, constructive advantages, and also reduces the risk of winding, since the loops are subject to a greater centrifugal force at the same peripheral speed. In order to avoid wear of the pins and thus damage to the cable, it is advantageous to choose the surface of the pins a, b from ceramic material. So the pens z. B. consist of commercially available ceramic tubes with a metal core.

In FIG. 1, an intermediate deduction is provided compared to the illustration in FIG. 1. From the pre-take-off 2, the cable 1 runs to the intermediate take-off 8, such as an injector nozzle or gear pair, is taken up after the intermediate take-off with the threading suction nozzle, not shown, and via thread guide rollers 9 and 10 by a thread brake 11 and the guide guide 12 in the initial position around the pin wheel 4 out to below the rotating pinwheel pair (see Fig. 7). Now the guide guide 12 is brought into the end position according to the arrow in FIG. 7. The cable 1 thus threads itself into the pinwheel pair 3, 4, and the suction nozzle can be switched off. Now the speed of the pinwheel pair 3, 4 is reduced to such an extent that between 12 and 10 there is no longer any significant cable tension. The thread guide roller 10 is then removed from the thread run and the speed of the pinwheel pair 3, 4 finely regulated so that a free cable loop 13, which can be set to any length, hangs between the intermediate take-off 8 and the thread brake 11. The length of the loop 13 can by z. B. a button 14 or be determined by an optical control device. This control element then has to bring the pulling-off speed of the pinwheel pair 3, 4 into the desired target state.

The thread brake 11 can be replaced by making the thread guide roller 9 variable in length. It is expedient to make them movable according to arrow 16 with a maximum deflection. Furthermore, a slight preload of the cable in front of the pin wheel 3, 4 ensures a weight or spring loading of the roller 9, which after removal me the thread guide roller 10 is effective from the cable run.

7, the wheel 4 has longer pins than the wheel 3. This results in an area on the pins b of the wheel 4 on which the cable 1 to be threaded can be placed without touching the pins a of the wheel 3. After the cable 1 has been moved with the guide 12 into the grooves 15 shown enlarged in FIG. 8, the cable is threaded into the pin wheels 3, 4 in a functional manner.

Claims (29)

1. A method of setting down continuous filaments or fibre yarns in layers, wherein the material (1) is supplied, preferably at high speed, by a supply device (2) and is then retarded with respect to its rectilinear movement by being moved into a winding position, in that it is deflected into a serpentine state by means of two wheels (3, 4) arranged parallel to each other with a space therebetween and which are mutually offset from one another but still partially overlap one another, axially extending pins (a, b), serving as deflection members, being mounted on the adjacent opposed faces of the wheels (3, 4), so that the pins overlap one another, the windings immediately thereafter being released again by the deflection members (a, b) so that, when free, they are fed to a storage device (7) in dependence with the loop speed, characterised in that the material (1) is formed into uniform serpentine windings, and these windings are moved closer together at least once prior to final storage.

2. A method as claimed in claim 1, in which the material (1) is conveyed at low tension to the intermediate storage means (5, 6).

3. A method as claimed in claim 1 or 2, in which the material (1) is guided by an additional conveying means (8) between the supply device (2) and the winding forming member (3, 4) in order to cause the material (1) to be fed at low tension into the winding forming region.

4. A device for carrying out the method as claimed in one or more of claims 1 to 3, including a cable feed device (2), a winding forming member (3, 4) comprising two wheels (3, 4) arranged parallel to one another with a space therebetween and which are mutually offset away from one another yet still partially overlap one another, axially extending pins (a, b), serving as deflection members for the material (1) to be formed into windings, being mounted on the adjacent opposed faces of the wheels (3, 4), so that the pins overlap one another, and a storage device (7), such as a can, associated with this member (3, 4), characterised in that in communication with the winding forming member (3, 4), a member is disposed upstream of the storage device (7) which receives the windings in their desired widths, the member acting as a compression mechanism which moves the windings closer together.

5. A device as claimed in claim 4, in which the compression mechanism is in the form of a roller (5).

6. A device as claimed in claim 4, in which the compression mechanism is in the form of a slider.

7. A device as claimed in claim 5, in which the compression mechanism is in the form of a rotatably driven carrier roller (5) or an endless belt.

8. A device as claimed in claim 7, in which the carrier roller (5) is arranged so that its horizontally extending axis is disposed vertically beneath the windings which travel towards the roller.

9. A device as claimed in claim 7 or 8, in which the carrier roller (5) is provided with a surface which is traversed from externally to internally.

10. A device as claimed in claims 5 to 9, in which a stripper (6) is associated with the compression mechanism.

11. A device as claimed in claim 7, in which the carrier roller (5) is provided with circumferential, parallel grooves in which a finger-like cable stripper (6) engages.

12. A device as claimed in claims 4 to 11, in which the compression mechanism is adapted so as to be variably angularly displaceable through an angle about an axis perpendicular to the roller axis.

13. A device as claimed more especially in claim 4, in which the pair of wheels is formed from two discs (3, 4) which are disposed slightly more than a pin length from one another and are parallel to, but offset from, one another.

14. A device as claimed in claim 13, in which an additional feed device, for example an injector nozzle (8), is provided upstream of the pair of wheels (3, 4) in order to convey the material (1) at low tension.

15. A device as claimed in claim 13 or 14, in which the radial spacings between the pins (a, b) on the respective wheels (3, 4) are variable.

16. A device as claimed in claim 15, in which the wheels (3, 4) are provided with a plurality of perforated rims for the insertion of the pins according to the desired, radial spacing.

17. A device as claimed in claim 13 or 15 and 16, in which the pins (b) or one wheel (4) are made, for example, 10 to 15 mm longer than the pins (a) of the other wheel (3).

18. A device as claimed in claim 17, in which the cable (1) to be threaded only abuts against the pins (b) of the wheel (4) having the longer pins, and a cable guide means (12) is disposed a short distance upstream of the pair of wheels (3, 4), the cable guide means (12) being laterally displaceable between the interlocking rods or bars for the threading of the cable.

19. A device as claimed in any of claims 13 to 18, more especially as claimed in claim 19, in which pins (a, b) are provided with a retaining means (15) for the laterally slidable cable (1).

20. A device as claimed in claim 19, in which the pins (a, b), of a wheel (3, 4) are each provided with a radial, externally open groove (15), such grooves (15) being disposed at identical axial spacings from the associated wheel disc.

21. A device as claimed in claim 20, in which the pins (a, b) of the two wheels (3, 4) are provided with such a groove (15), and the grooves are disposed in a line one behind the other when the wheels are mounted in their operating positions.

22. A device as claimed in claim 20 or 21, in which the outer edges of the grooves (19) are provided with inclined flanks.

23. A device as claimed in claim 22, in which the bottom edges of the grooves are provided with substantially perpendicular flanks.

24. A device as claimed in claims 18 and 20, in which the cable guide means has a slot width which is smaller than the groove width of the pins.

25. A device as claimed in any of claims 18 to 24, in which the wheels (3, 4) are provided with an unequal number of pins (a, b) in such a way that one wheel has only half the number of pins or an integral fraction of pins.

26. A device as claimed in any of claims 13 to 25 having a cable guide means disposed upstream of the winding forming member, in which a cable retarding means (11, 9) is disposed upstream of the cable guide means.

27. A device as claimed in claim 26, in which, in its operating position, the cable is guided at low tension upstream of the cable retarding means and is preferably guided in a freely suspended loop (13).

28. A device as claimed in claim 27, in which the tension of the cable passing into the folding mechanism and/or the length of the freely suspended loop is/are electronically and continuously controlled (14).

29. A device as claimed in claim 26, in which the cable retarding means is pre-shaped by a springloaded or weighted yarn guide roller (9) which, with maximum deflection, controls the travel or the tension in, for example, a cable loop (14).

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