EP1369370B1 - Method and apparatus for depositing a spinning material tow - Google Patents

Description

The invention relates to a method for laying a spinning cable according to the preamble of claim 1 and to an apparatus for carrying out the method according to the preamble of claim 6.

A generic method and a generic device are known for example from EP 1 013 592 A1.

When melt spinning of single or multiple fiber bundles, these are stored in the form of a tow for caching in a jug in order to perform the tow for further processing. In this case, it is necessary that a relative movement is carried out between the spinning cable feed and the can, in order thus to obtain a uniform filling of the can. For this purpose, basically two different variants are known in the prior art. In a first variant, the can is moved by means of a traversing device relative to the inlet position of the tow. Such methods and devices as known for example from EP 0 875 477 A2, have the disadvantage that the pot to be filled must be moved, which in particular at the end of the filling requires a considerable effort and accordingly designed large drives.

In a second variant, the jug stands still during filling. In this case, the tow is moved by the inlet in the pot by additional means in the form of a turntable. This variant is known from EP 1 013 592 A1.

In the known method and the known device, the tow is rotated by means of a rotatably driven turntable. The turntable is held eccentrically in a rotatable bearing plate, the turntable movement will overlay. The turntable is preceded by a conveyor which continuously guides the tow to the turntable. On the turntable a guide tube is held in which the tow is guided.

The known method and the known device has the significant disadvantage that a twist in the tow is produced by the rotational movement of the turntable and the bearing plate when depositing the tow, which adversely affects the later withdrawal from the pot especially with thick tows. In addition, the promotion of the tow is obstructed by additional deflections in the pot by additional guide means, so that only small filling densities can be achieved within the pot when depositing the tow.

No. 2,986,781 discloses a device for aldering a fiber strand into a container, wherein two oppositely arranged endless bander are used as conveying means.

It is an object of the invention to provide a method and an apparatus of the type mentioned in such a way that at a stationary pot the tow can be conveyed in a straight run swirl-free in the pot and can be stored with gleichmä-Biger filling density in the pot.

This object is achieved by a method with the features of claim 1 and by a device having the features of claim 6. Further advantageous developments are given by the features and feature combinations of the respective dependent claims.

The invention has the particular advantage that the tow is conveyed and stored directly without additional guidance means in the pot. For this purpose, the movement of the tow is carried out for discharging into the pot by oscillating movements of the conveying means during conveying. As a result, the conveying direction changes constantly, so that the inlet position of the tow into the pot is determined by the conveying direction. This results in two special advantages in the storage of the tow. On the one hand, the energy introduced into the tow by the conveying means can be used without any reduction to produce a filling density. On the other hand, the oscillating Movements does not change the runnability of the tow. The tow is directed to drop directly through the conveyor, so that unwanted interference effects are avoided in the tow. The tow is placed completely swirl-free in the pot.

In order to obtain a uniform filling of the pot, the tow is performed in a first advantageous embodiment of the invention by two superimposed oscillating movements of the conveyor. The directions of movement of the two movements are aligned transversely to each other, so that each area in the pot can be filled evenly.

The movements can in principle be performed by an oscillating pivoting of the conveying means and or by an oscillating linear movement of the conveying means. Thus, the conveying means can be advantageously carried out by two superimposed pivoting movements or by two superimposed linear movements or by a pivoting movement and a superimposed linear movement.

The movements of the conveyor are carried out at the same time preferably at different speeds. Thus, for depositing the tow, preferably, a movement of the conveyer corresponding to a traverse is quickly performed, so that the tow is laid back and forth in a longitudinal direction to fill the can. The second movement, on the other hand, is performed slowly to create one position of the tow over the other within the can.

In order to make adjustments to the geometry of the pot as well as the nature and size of the tow, the speeds of movement of the conveyor is independently changed and adjusted according to a particularly advantageous method variant. There is also the possibility to change the deflection path that is executed during the movement.

To carry out the method, a device according to the invention is provided, in which the carrier carrying the conveyor has assigned at least one drive, so that the conveyor is guided continuously in oscillating movements transversely to the conveying direction during conveying. Thus, the conveying direction is constantly changed during the feeding of the tow, so that the tow takes a constantly changing inlet position in the pot. The particular advantage of the device according to the invention is that the tow is conveyed and guided exclusively by the funding in the stationary pot.

A particularly simple and effective way to store the tow over the entire cross section of a pot evenly, can be achieved by the advantageous development of the device according to the invention, in which the conveying means are associated with two movable support. In this case, the movable carrier are driven by two independently controllable drive to each an oscillating movement, wherein the directions of movement of the carrier are aligned transversely to each other.

In order to perform the actual function of the conveyor substantially without restriction, in a particularly preferred embodiment of the carrier is formed by a rocker, which carries the funding. The rocker is associated with a drive, for example, to perform a quick pivoting movement for depositing the tow.

The superimposed second movement of the conveyor can be achieved in that the mounting of the rocker is mounted on a second rocker or held on a carriage. In this case, the second rocker or the carriage can be performed by an associated drive a slow movement to guide the first rocker and thus superimposed to guide the conveyor.

In order to be able to change the cans as quickly as possible after filling a can, a holder is provided which holds at least the conveying means and a carrier and which can be guided between several depositing positions. This allows the conveyor after filling quickly lead to another storage position with an empty pot.

For uniform and intensive promotion of the tow, the funding is preferably formed by two driven reel rollers. The drive of the reel rollers is carried out regardless of the introduced by the carrier position changes of the reel rollers.

The method according to the invention as well as the device according to the invention are particularly suitable for laying down thick tows with large spun tiers of the fiber bundles of, for example,> 12,000 dtex, which is used in particular for further processing for staple fibers. For this purpose, the device according to the invention is arranged directly downstream of a spinning device which spins one or more fiber bundles of a polymer melt.

The method according to the invention is described in more detail below with reference to the attached drawings with reference to some embodiments of the device according to the invention.

Fig. 1

schematisch ein erstes Ausführungsbeispiel der erfindungsgemäßen Vorrichtung mit einer vorgeordneten Spinneinrichtung

Fig. 2

schematische Ansichten des Ausführungsbeispiels der erfindungsgemäße Vorrichtung nach Fig. 1

Fig. 3

schematisch ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung

Fig. 4

schematisch ein weiteres Ausführungsbeispiel der erfindungsgemäßen Vorrichtung

They show:

Fig. 1

schematically a first embodiment of the device according to the invention with an upstream spinning device

Fig. 2

schematic views of the embodiment of the device according to the invention of FIG. 1st

Fig. 3

schematically a further embodiment of a device according to the invention

Fig. 4

schematically a further embodiment of the device according to the invention

In Fig. 1, a first embodiment of the device according to the invention for carrying out the method according to the invention is shown schematically in a view with an upstream spinning device. The device according to the invention is indicated in FIG. 1 by the reference numeral 3 and hereinafter referred to as depositing device. The depositing device 3 is preceded by a spinning device 1 and a deduction 2. The depositing device 3 comprises a conveying means 11 and a can 4.

The spinning device 1 has a spinneret 6, which extrudes a fiber bundle 7. Here, the spinneret 6 may have more than 80,000 nozzle holes. Below the spinneret, the spinning device 1 usually has cooling devices which generate a cooling air flow for cooling the fiber bundle. The cooling device is not shown in this example. Likewise, the number of spinnerets of the spinning device 1 is exemplary. Thus, two, three, four, five or even more spinnerets can be arranged parallel next to each other, each extruding a fiber bundle. To merge the fiber bundle 7 to the tow 15, a plurality of preparation means 8 can be arranged between the spinning device 1 and the withdrawal unit 2. In this case, a spin finish is applied to the fiber bundle and to the tow 15. When using multiple spinnerets all fiber bundles can be brought together by preparation device or preparation rollers to a tow.

The deduction work contains several driven take-off rolls 9, which are partially wrapped by the tow 15. By the take-off rolls 9, the tow 15 is subtracted from the spinneret 6 and guided to the depositing device 3.

The depositing device 3 has the conveying means 11, which is formed from two cooperatively driven winding rollers 13.1 and 13.2. The conveyor 11 is guided above the can 4 in a holder 5.

In order to explain the depositing device 3, reference is also made to FIG. 2, which, in addition to the front view shown schematically in FIG. 1, represents a side view of the depositing device 3 without a can. Here, the depositing device is shown in Fig. 2.1 in a non-deflected position of the conveyor 11 and in Fig. 2.2 in a deflected position of the conveyor 11. The following description applies both to FIG. 1 and FIG. 2 insofar as no explicit reference is made to one of the figures.

The conveyor 11 is held on a first rocker 12. The rocker 12 is rotatably supported via a pivot axis 16 on a second rocker 14. The first rocker 12 is associated with a first drive 17 through which the first rocker 12 is driven to oscillate, so that the conveyor 11 performs a pivoting movement shown in dashed lines in Fig. 1.

The second rocker 14, carries above the first rocker 12 an inlet roller 10 through which the supplied tow cable 15 is deflected and guided to the conveyor 11. The second rocker 14 is pivotally supported on a bearing pin 18 which is arranged on the holder 5. The second rocker 14 is associated with a second drive 19 through which the second rocker 14 is guided in a direction of movement aligned transversely to the pivoting direction of the first rocker 12. The drives 17 and 19 are connected to a control device 20.

The holder 5 is designed to be movable in order to change between two storage positions for the spinning fork 15. In Fig. 1, the second storage position of the tow 15 is shown in dashed lines.

In the arrangement shown in Fig. 1, a tow 15 is provided for storage in a pot through the spinning device 1 and the deduction 2. In this case, the tow cable 15 is conveyed by the conveyor in the direction of the provided can 4. To ensure even filling of the can 4 To obtain, is controlled by the control device 20, the first drive 17 of the first rocker 12 such that a continuously oscillating pivotal movement occurs at the first rocker so that the conveyor 11 is reciprocated in a first direction of movement. As a result, the conveying direction of the tow 15, which is indicated by the dashed arrows in FIG. 1, changes.

To perform a transverse deflection movement of the conveyor 11, the first rocker 12 is changed by means of the second rocker 14 in position. In Fig. 2.1 and 2.2, the situation is shown, in which the second rocker 14 is pivoted by the second drive 19. The pivotal movement of the second rocker 14 is carried out oscillating at a slower speed in order to achieve a uniform filling of the can 4.

In each deflected position of the conveyor 11, the tow 15 is continuously conveyed into the can 4. Thus, each of the inlet positions within the can 4 is determined by the constantly changing conveying direction. The tow 15 thus occurs without additional deflection from the conveyor 11 directly into the can 4 a. The pivotal movement of the first rocker 12 and the pivoting movement of the second rocker 14 are independently adjustable via the drives 17 and 19 and the control device 20. Preferably, the pivoting movements of the rockers 12 and 14 are carried out at different speeds. The pivoting angles, which pass through the wings 12 and 14 during the movements are dimensioned such that the tow cable 15 can be stored in each area of the can 4. Depending on the size of the can 4, the pivot angle of the rockers 12 and 14 can be adjusted.

As soon as the can 4 is filled with the tow 15 in the situation illustrated in FIG. 1, the deposit positions are changed. For this purpose, the holder 5 is guided and fixed in a second adjacent depositing position. The tow is severed with auxiliary equipment and eingele0gt in the new empty can 4. The full pot can thus be easily replaced by a new empty pot.

In Fig. 3, another embodiment of a device according to the invention is shown schematically in a cross-sectional view. The embodiment in Fig. 3 shows the depositing device, in which the conveying means 11 is guided on the holder 5 and the can 4 is arranged below the conveying means 11. The function and structure of the depositing device is substantially identical to the previous embodiment, so that only the differences are shown at this point.

The conveyor 11 is also formed here by two reel rollers, which are pivotally supported on the rocker 12. The rocker 12 is held by the pivot axis 16 on a carriage 21. The carriage 21 is guided via a linear guide 22 on the holder 5. In this case, the carriage 21 is assigned a linear drive 23, by means of which the carriage 21 can be changed in its position. The linear drive 23 and the drive 17 of the rocker 12 are coupled to the control device 20.

To guide the tow 15 during the promotion by the conveyor 11, the conveyor 11 is moved by the rocker 12 in a pivoting direction transverse to the plane and by the carriage 21 and the linear drive 23 in a direction of movement in drawing plane. The carriage 21 is for this purpose moved by the linear drive 23 oscillating, wherein the linear movement is carried out at a slower speed than the pivoting movement of the rocker 12. The stroke of the carriage 21 is determined by the linear drive 23, wherein a stroke change by controlling the linear drive 23 executable is.

4, a further embodiment of a device according to the invention is shown schematically in several views. The embodiment in Fig. 4 shows only the storage device, which a deduction and a spinning device is arranged upstream. The spinning device and the withdrawal mechanism could, for example, be designed as described above in the exemplary embodiment according to FIG. The depositing device is shown schematically in a cross-sectional view in FIG. 41 and schematically in a plan view in FIG. 4.2. For clarity, the components of the same function are provided with identical reference numerals.

The conveyor 11, which is formed by two reel rollers 13.1 and 13.2 and a roller holder 25 is supported by a rocker 12. The rocker 12 is fixedly connected to the roller holder 25 for this purpose. The rocker 12 is mounted at two ends on the pivot axes 16.1 and 16.2, which are opposite, to a holder 5. The rocker 12 and the holder 5 are each formed as a rectangular frame profile, wherein the frame profile of the holder 5 surrounds the rocker 12 at a distance. The rocker 12 is pivotally supported on the holder 5 via the pivot axes 16.1 and 16.2. The pivotal movement of the rocker 12 is controlled by a coupled with the pivot axis 16.1 drive 17.

The holder 5 is guided in a linear guide 22 on a second rocker 14. The second rocker 14 is also formed by a rectangular frame profile, on the long inner sides of the linear guide 22 is formed for the holder 5. On the rocker 14 thus allows the holder 5 between several storage spaces 24 back and forth. The rocker 14 is pivotally mounted at two ends by the bearing pins 18.1 and 18.2 on a machine frame 26. The pivoting movement of the rocker 14 is controlled by the drive 19, which is coupled to the bearing pin 18.2.

In the embodiment of the depositing device shown in FIG. 4, the holder 5 is held in a left depositing position 24 of a rocker 14. While depositing a tow, the holder 5 is locked to the rocker 14. When depositing a tow, the reel rollers 13.1 and 13.2 of the conveyor 11 are driven continuously, so that the tow in the direction a held in the storage space 24 can 4 enters. To fill the can 4, the rocker 12 is oscillated by the drive 17, so that the conveyor 11 constantly varies its conveying direction. The second movement of the conveyor 11 is effected via the drive 19 by the rocker 14. Here, the pivoting movement of the rocker 14 is performed in comparison to the pivoting movement of the rocker 12 at a slower speed. It serves only to be able to distribute the tow evenly over the entire cross section of the can 4.

As drives 17 and 19 electrical, electro-mechanical, pneumatic or hydraulic means can be used.

As soon as the can 4 is filled, the movement of the rocker 14 is stopped and the holder 5 is released. Then, the holder 5 is guided in the adjacent storage space 24 and locked again. Now a new pot can be filled with the spinneret.

The embodiments shown in FIGS. 1 to 4 are exemplary in their construction. Basically, all suitable means for carrying out a movement of the conveyor means are used to guide the tow during conveying such that a subsequent can is evenly filled with high filling density. In that regard, the invention extends to all devices in which a stationary jug is used and in which the tow or a similar strand-like material is guided exclusively by movement of the conveyor.

LIST OF REFERENCE NUMBERS

1

spinner

2

off unit

3

depositing device

4

pot

5

holder

6

spinneret

7

fiber bundles

8th

preparation device

9

off roll

10

inlet roller

11

funding

12

First swingarm

13

reel roll

14

Second swingarm

15

tow

16

swivel axis

17

First drive

18

pivot

19

Second drive

20

control device

21

carriage

22

linear guide

23

linear actuator

24

space

25

roller holder

26

machine frame

Claims (9)

1. Method of depositing a filament tow, in which the filament tow (15) is conveyed into a stationary can (4) by a conveyance means (11) and in which for deposition into the can the filament tow is guided in such a way that the feed position of the filament tow in the can constantly changes, wherein for deposition into the can the guidance of the filament tow is effected during conveying by oscillating motions of the conveyance means transversely to the conveyance direction, and wherein the filament tow is guided by a first oscillating motion of the conveyance means and by a second oscillating motion of the conveyance means, which is superimposed on the first motion, the direction of the first motion being oriented transverse to the direction of the second motion, characterized in that the conveying means (11) is formed by two driven reels (13.1, 13.2), which cooperate with one another for conveying the filament tow (15).
2. Method according to claim 1, characterized in that the conveyance means is moved by a first oscillating pivoting motion and a second oscillating pivoting motion.
3. Method according to claim 1, characterized in that the conveyance means is moved by a first oscillating pivoting motion and a second oscillating linear motion.
4. Method according to one of claims 1 to 3, characterized in that the two motions of the conveyance means are carried out simultaneously at different speeds.
5. Method according to one of claims 1 to 4, characterized in that the speeds of the motions of the conveyance means are changed and set independently of one another.
6. Device for carrying out the method according to one of claims 1 to 5 with a conveyance means (11) and a stationary can (4), wherein a filament tow (15) is conveyed into the can (4) by the conveyance means (11) and wherein the conveyance means (11) is held on a mobile support (12), wherein at least one drive (17) is associated with the support (12), by which drive an oscillating motion of the conveyance means (11) transverse to the conveyance direction may be continuously performed and controlled during conveying and wherein two mobile supports (12, 14) are associated with the conveyance means (11), which mobile supports can be driven to an oscillating motion respectively by two drives (17, 19) being controlled independently from one another, the directions of motions of the supports (12, 14) being aligned transversely with respect to one another, characterized in that the conveyance means (11) is formed by two driven reels (13.1, 13.2), which cooperate with one another for conveying the filament tow (15).
7. Device according to claim 6, characterized in that the mobile supports are formed by rockers (12, 14) being respectively supported pivotally, wherein a first rocker (12) is supporting the conveyance means (11), the second rocker (14) is supporting the bearing (16) of the first rocker (12) and both rockers (12, 14) being pivotable by means of the associated drives (17, 19) independently from one another in an oscillating manner.
8. Device according to claim 7, characterized in that the rocker (12) supporting the conveyance means (11) is mounted on a holder (5) and in that the holder (5) can be moved in a linear guide (22) back and forth on the second rocker (14) between a multiplicity of depositing locations (24).
9. Device according to claim 6, characterized in that the mobile supports are formed by a rocker (12), which is pivotally mounted on one side and a linear guided carriage (21), the rocker (12) on a free end supporting the conveyance means (11), the carriage (21) supporting the bearing (16) of the rocker (12) and the rocker (12) and the carriage (21) being independently movable in an oscillating manner via the associated drives (17, 23).

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