EP3484801B1 - Method for processing a strand-shaped fiber sliver, and roving frame machine - Google Patents

Description

technical field

The present invention relates to a method for processing a strand-shaped fiber structure, the fiber structure being fed to an air spinning nozzle of a roving machine used to produce roving, the fiber structure being rotated within the air spinning nozzle during normal operation of the air spinning nozzle with the aid of a turbulent air flow, so that a roving is formed from the fiber structure, and wherein the roving finally leaves the air-spinning nozzle via an outlet of the air-spinning nozzle.

State of the art

Roving machines with corresponding air spinning nozzles are known in the prior art and are used to produce a roving from an elongated, strand-like fiber structure. The air spinning nozzles usually and preferably also in the air spinning machine according to the present invention comprise an internal turbulence chamber and air nozzles opening into the turbulence chamber, via which a turbulent air flow is generated within the turbulence chamber during operation of the air spinning machine. The outer fibers of the fiber structure are wound around the inner core fibers by the turbulent air flow in the area of the inlet opening of a yarn-forming element extending into the turbulence chamber and thus form the core fibers that are crucial for the desired strength of the roving. This creates a roving with a real twist, which is finally discharged from the vortex chamber via a discharge channel and finally leaves the air spinning nozzle via an outlet.

In general, within the meaning of the invention, the term roving (other name: roving) is to be understood as meaning a fiber structure in which at least some of the fibers are wound around an internal core. This type of yarn is characterized by the fact that, despite a certain strength, which is sufficient to pull the yarn to a subsequent To transport textile machine, is still warpable. The roving can thus using a default device, z. B. the drafting system, a textile machine processing the roving, for example a ring spinning machine, before it is finally spun into a conventional yarn.

In the state of the art, it is now customary to wind the roving leaving the air spinning nozzle onto a tube, so that a bobbin (=tube wound with roving) is formed, which is finally passed on to the subsequent textile machine. A corresponding roving machine is, for example, in EP 2511403 A1 described.

Closest prior art DE3034812 discloses an apparatus for automatically inserting a sliver into a hopper.

CH221905 discloses a method of roving fibers and a machine for carrying out the method.

Presentation of the invention

It is the object of the present invention to improve the known method with regard to textile machines which are to be supplied with the roving and which are working ever faster.

The object is achieved by a method and a roving machine with the features of the independent patent claims.

According to the invention, the method for processing a strand-shaped fiber structure is now characterized in that the roving leaving the air spinning nozzle is deposited in or on a receptacle provided in the area of the roving machine. In contrast to the prior art, the roving is not wound onto a tube to form a spool. Rather, it is loosely deposited in or on the receptacle, from which it can be removed again after the receptacle has been transported to a subsequent textile machine and processed further. The receptacle is preferably a container, particularly preferably a container that is open at the top, as is known in spinning mills and is generally referred to as a sliver can. The sliver can can be designed to be round or elongated, for example rectangular, in a plan view. With regard to possible shapes is, for example, on the DE10241011A1 or the DD232246A1 referenced, the shape of the container for the present invention is of secondary importance. However, it is also conceivable for the receptacle to be designed merely as a flat section without side walls, onto which the roving is deposited, for example in heaps, during deposition. The recording can thus z. B. be present as a disc-shaped element that can be transported after the filing of the roving with the roving to another textile machine.

The decisive factor is that the roving is not wound tightly onto a tube, as is usual, but is placed in or on the receptacle in such a way that it is no longer subjected to tensile stress after being placed. The receptacle is preferably designed as a container which has a volume of at least 0.05 m ³ , preferably at least 0.1 m ³ . Since the amount of roving deposited in or on the receptacle corresponds to the multiple of the amount of roving that can be wound onto a tube, the roving deposited according to the invention can also be passed on to textile machines that have a high roving consumption. For example, appropriately filled containers are ideal as templates for a conventional air-jet spinning machine, on which several hundred meters of yarn per minute are produced at each spinning position.

The roving is preferably placed in or on the receptacle in such a way that after the receptacle has been completely filled, the roving has an average density of at least 0.14 g/cm ³ , preferably at least 0.15 g/cm ³ , particularly preferably at least 0 .16 g/cm ³ .

According to the invention, the roving is drawn off from the air spinning nozzle with the aid of a drawing-off device. The take-off device can, for example, comprise two corresponding take-off rollers driven by a drive, between which the roving is clamped out after leaving the air spinning nozzle and directed in the direction of the recording. After passing the take-off device, the roving finally reaches the area of a depositing device, is grasped by it and deposited in or on the receptacle. The depositing device ensures that the roving gets into or onto the receptacle in a defined and controlled manner, so that knotting or unfavorable and undefined overlapping of the roving for later removal of the roving from the receptacle are avoided. The roving is preferably deposited in loops in or on the receptacle with the aid of the take-off device, it being possible for the loops to have a circular or oval shape at least in sections.

The depositing device preferably comprises a depositing plate with a depositing channel through which the roving is guided during depositing, with the depositing plate being set in rotary motion during depositing of the roving, preferably with the aid of a drive.

In addition or as an alternative, there can also be a turntable on which the receptacle is located during depositing and which is driven by a drive while the roving is deposited (whereby the drive can be the same drive that also drives the depositing plate, so that both plates can be driven synchronously).

While a rotational movement of the storage plate and/or the turntable is possible, the storage plate and/or the turntable can also be driven with the aid of a drive which causes a non-rotary movement of the corresponding turntable and/or the storage plate. For example, instead of the turntable, another movement element could be provided, on which the receptacle is placed or otherwise held while the roving is being deposited and which is moved on a movement path that consists of or includes individual linear or curved sections in order to prevent unwanted rotations of the roving around its longitudinal axis during filing. In particular, the recording can be moved exclusively or partially in a translatory manner.

Furthermore, it is conceivable that the recording is alternately rotated in a first and an opposite second direction. For example, the receptacle could be alternately rotated 360° clockwise and then counterclockwise by the same amount to avoid unwanted rotations of the laid roving. Likewise, two storage plates could be present, which deposits the roving from two air spinning nozzles arranged next to one another in or on a common receptacle. In this case, too, the storage plates could rotate alternately in opposite directions, with an angular range of 180° being advantageous here.

According to one embodiment, which does not fall under the subject matter of the claim, the roving, after passing the take-off device, is immediately grasped by the depositing device and deposited in or on the receptacle.

In this case, there are no further elements between the take-off device and the depositing devices that guide the roving through direct contact. Of course, one or more sensors can be arranged between the take-off device and the depositing device, which monitor the quality of the roving (thickness, hairiness, etc.) or monitor whether roving emerges from the air spinning nozzle at all and/or enters the area of the depositing device or which monitor the course of the roving.

According to the invention, the roving forms a slack between the take-off device and the depositing device, the vertical spatial extent of which is regulated via the depositing speed of the depositing device. The roving thus describes a parabola, for example, between the air spinning nozzle or the take-off device and the depositing device or a guide located in front of it (e.g. a guide roller). If the vertical spatial extension exceeds or reaches a predetermined maximum value, the depositing speed is increased. If the vertical spatial extent falls below or reaches a predetermined minimum value, the depositing speed is reduced, the depositing speed being increased or decreased, for example, by changing the rotational speed of the depositing plate and/or the turntable, and the change preferably being effected by a Control of the roving machine is made automatically.

Finally, it is also conceivable that the roving is guided via a guide between the take-off device and the depositing device. The guide may be in the form of a conveyor belt or an elongate channel, for example, and there could be one or more nozzles connected to a compressed air supply to direct the roving towards the laying device or through the guide with the aid of compressed air. The nozzles can also serve as a threading aid due to the air flow emanating from them, in order to move the roving into or onto the guide after it has left the draw-off device or the air spinning nozzle.

As a rule, the normal operation of the roving machine (during which roving is produced and deposited in or on the take-up) is interrupted by stop phases in which no roving is produced by the air spinning nozzle. Reasons for this are, for example, tearing of the roving, a problem in feeding the fiber structure or clogging of the air spinning nozzle. It is provided according to the invention that a start phase is run through between such a stop phase and the subsequent normal operation. The starting phase is characterized by the fact that the production of the roving is resumed, with the roving produced by the air spinning nozzle during the starting phase being at least temporarily not deposited in or on the receptacle after leaving the air spinning nozzle, but being disposed of via a roving discharge. The roving removal can be, for example, a suction element (e.g. a suction tube) to which negative pressure is applied. In any case, it is advantageous if an initial section of the roving produced when roving production is resumed does not get onto or into the receptacle, since the quality of the initial section generally does not correspond to the specifications. If a certain quantity/length of roving was removed during the starting phase, the roving removal is deactivated or bypassed (e.g. by a switch that influences the course of the roving), so that the roving produced subsequently gets into or onto the receptacle, whereby the roving going into or onto the take-up is separated from the discharged roving section (to avoid that this ends up going into or onto the take-up).

It has particular advantages when the recording has a defined Filling level has been reached or when a defined roving quantity or roving length has been produced by the air spinning nozzle and placed in or on the receptacle, a receptacle changing process is carried out. The amount of roving or length of roving or the degree of filling mentioned can be monitored with the aid of one or more sensors. In any case, after the corresponding target values have been reached, the receptacle that has been filled up to this point in time is replaced by an empty receptacle. The changing process can be carried out automatically with the aid of a take-up changing device on the roving machine or else manually by an operator.

There are also advantages if the production of the roving is not stopped during the take-up change process. In other words, roving should be produced by the air-jet spinning machine during the take-up changing process. The roving produced is thus placed in or on a first receptacle before the receptacle changing process. During or after the take-up changing process, the roving is deposited in or on the second take-up, with the corresponding take-ups being shifted under the air spinning nozzle, which always remains in the same place (e.g. by the above-mentioned take-up changing device). A roving loop present between the two recordings after the recording changeover process must finally be severed in order to be able to remove the full recording from the roving machine independently of the filling of the new recording.

It is particularly advantageous if the roving produced by the air spinning nozzle during the take-up changing process is disposed of at least in sections via a roving discharge. The roving is thus produced continuously during the recording change process, getting into or onto a first recording before the recording changing process and after or already during the recording changing process in or onto a second recording. In the meantime, the roving leaving the air spinning nozzle is discharged via the roving discharge, with the roving section located in or on the first receptacle being separated beforehand. After the end of the discharge process, the roving leaving the air spinning nozzle is finally fed back to the depositing device, which deposits the roving in or on the above-mentioned second recording. Preferably, the amount of roving produced per unit of time by the air spinning nozzle is throttled at least temporarily compared to normal operation during the take-up changing process or during the time in which the roving is disposed of via the roving discharge, in order to minimize the amount of roving disposed of.

It is also advantageous if the production of the roving is temporarily interrupted during or before the take-up changing process. This can be done either by stopping the feed of the fiber structure into the air spinning nozzle or by interrupting the air supply to the same. In any case, the roving production is stopped. If the previously filled recording was replaced by an empty recording, the roving production can be continued again, it being advantageous in principle if the depositing device is already in motion, z. B. in rotation, is offset before the roving reaches the storage device.

It is also conceivable to start roving production again during the exchange of said receptacles and to discharge the initial section of the roving then produced via the roving discharge for a certain period of time before roving is again deposited in or on the initially empty receptacle. It is therefore particularly advantageous if, after the production of roving has been interrupted, a start phase is run through during which the roving produced by the air spinning nozzle is at least temporarily not deposited in or on the receptacle after leaving the air spinning nozzle, but is instead disposed of via a roving discharge.

There are particular advantages if the receptacle is moved to an air-jet spinning machine used for the production of conventional yarn after it has been partially or completely filled with roving, the roving present in or on the receptacle being spun into a yarn using the air-jet spinning machine. The filled receptacle thus serves as a template for the air-jet spinning machine, which also uses a turbulent air flow to produce a conventional yarn from the roving, which can finally be processed into a fabric, for example with the help of a weaving machine. Corresponding air spinning machines are sufficient in the prior art are known and generally include a large number of spinning positions, each with a drafting system for drawing the roving, a downstream air spinning nozzle for imparting the desired twist and thus for producing the yarn, and a winding unit for winding the yarn leaving the air spinning nozzle.

It is also advantageous if the receptacle, after it has been partially or completely filled with roving, is moved to a spinning and knitting machine used to produce a knitted fabric, with a knitted fabric being produced from the roving present in or on the receptacle using the spinning and knitting machine. A spinning and knitting machine usually also includes a drafting system for warping the roving. There is also a twisting unit that gives the warped roving a slight twist so that it can be transported to a knitting unit of the spin-knitting machine. Finally, the knitting unit processes the warped roving into a knitted fabric. In general, the knitting unit of the spin-knitting machine can be located a few centimeters to several meters away from the twisting unit. If this distance is above a predetermined maximum value, it can be advantageous to equip the material with one or more filaments, whereby the filament can be introduced into the material flow in the area of the drafting system or the twist unit, thus creating a kind of core yarn.

The roving machine according to the invention for producing a roving from a strand-like fiber structure comprises at least one air spinning nozzle for producing roving from the fiber structure fed to the air spinning nozzle, wherein the air spinning nozzle is designed to impart a rotation to the fiber structure within the air spinning nozzle with the aid of a turbulent air flow generated by air nozzles of the air spinning nozzle , so that a roving is formed from the fiber structure, and wherein the air spinning nozzle has an outlet via which the roving leaves the air spinning nozzle during operation of the same, wherein the roving machine comprises a depositing device, with the help of which the roving leaving the air spinning nozzle into or onto a receptacle can be deposited, and wherein the roving machine has a roving discharge for at least temporary disposal of the roving produced by the air-jet spinning nozzle after leaving the air-spinning nozzle, and wherein the roving machine has a take-off device for drawing off the Includes roving from the air spinneret.

The roving machine includes a controller or is connected to a controller that is designed to operate the roving machine according to the method described above.

Brief description of the figures

Fig. 1

ausgewählte Elemente einer Vorspinnmaschine in der Seitenansicht,

Fig. 2

eine Schnittdarstellung eines Ausschnitts einer Luftspinndüse einer erfindungsgemäßen Vorspinnmaschine, und

Fig. 3

ausgewählte Elemente einer erfindungsgemäßen Vorspinnmaschine in der Seitenansicht sowie eine Draufsicht auf eine als Behältnis ausgebildete Aufnahme mit Vorgarn.

Further advantages of the invention are described in the following exemplary embodiments. They show, each schematically:

1

selected elements of a roving machine in side view,

2

a sectional view of a section of an air spinning nozzle of a roving machine according to the invention, and

3

selected elements of a roving machine according to the invention in side view and a plan view of a receptacle designed as a receptacle with roving.

Ways to carry out the invention

1 shows a schematic side view of a machine (only selected elements relevant for understanding the invention being shown; the same also applies to the remaining figures). This embodiment of the roving frame does not fall under the subject matter of the claim.

If required, the roving machine can include a drafting system with several drafting system rollers 15, each of which can be rotated about an axis of rotation (only two of the six drafting system rollers 15 are provided with a reference number), the drafting system being connected to a fiber structure 1, for example in the form of a doubled draw frame sliver, during the spinning operation , is supplied.

Furthermore, the roving machine shown comprises one or more air spinning nozzles 2 arranged adjacent to one another, each with an internal vortex chamber 23 (see FIG 2 ), in which the fiber structure 1 or at least some of the fibers of the fiber structure 1 is provided with a twist (the precise mode of operation of the spinneret is described in more detail below).

In addition, the roving machine comprises a take-off device 6, preferably with a plurality of interacting take-off rollers 16, with the aid of which the roving 3 leaving the spinneret via its outlet 4 is grasped and guided (The pull-off rollers 16 can preferably be set in rotary motion with the aid of a drive, which is not shown). The roving machine must not necessarily have a drafting system, as in the 1 and 3 is shown.

In any case, the roving machine works according to an air spinning process. To form the roving 3, the fiber structure 1 is guided into the turbulence chamber 23 of the air spinning nozzle 2 via an inlet 13 of the air spinning nozzle 2, in which a so-called fiber guiding element 14 is preferably arranged (see also 2 ). There it is rotated, ie at least a part of the free fiber ends of the fiber structure 1 is caught by an air flow which is generated by air nozzles 10 correspondingly arranged in a vortex chamber wall surrounding the vortex chamber 23 . Some of the fibers are pulled out of the fiber structure 1 at least a little and wound around the tip of a yarn-forming element 11 protruding into the eddy chamber 23 . Because the fiber structure 1 is drawn off from the eddy chamber 23 via a discharge channel 12 arranged within the yarn-forming element 11, the free fiber ends are finally also pulled in the direction of the yarn-forming element 11 and, in the process, wrap around the centrally running core fibers as so-called winding fibers - resulting in a roving 3 having the desired twist.

In general, it should be made clear at this point that the roving 3 produced is a yarn with a relatively small proportion of twisted fibers, or a yarn in which the twisted fibers are wrapped relatively loosely around the inner core, so that the Roving 3 remains draftable. This is crucial because the roving 3 produced has to be drawn again on a subsequent textile machine (e.g. a conventional air-jet spinning machine) with the aid of a drafting system in order to be able to be further processed into a conventional yarn which can be processed into a fabric, for example on a weaving machine.

The core of the present invention is now the 1 and 3 refer to. So it was previously customary to rove 3 regardless of whether it was with a conventional flyer or an air roving machine, to be wound onto a sleeve.

In contrast to this, the present invention now proposes loosely depositing the roving 3 after leaving the air spinning nozzle 2 in a receptacle 5 designed as a container, with the sliver cans known in spinning mills preferably being able to be used here.

How among other things 1 can be seen, the roving machine has a depositing device 7 for this purpose, which comprises at least one depositing plate 18 .

The depositing plate 18 can be rotated with the aid of a drive (not shown) in order to be able to place the roving 3 coming from the air spinning nozzle 2 in a loop in the receptacle 5 .

Alternatively or additionally, the storage device 7 can also have an in 3 shown turntable 19, with the help of which the receptacle 5 can be set into rotary motion.

If both the turntable 19 and the storage plate 18 (which in the case of 3 offset to the central axis of the receptacle 5) is set into a rotary movement, this results in the in 3 laying pattern of the roving 3 shown below left or the shown loops 22 ( 3 shows a section of a roving frame and also a partially filled with roving 3 receptacle 5 from above; of course, this does not reflect the actual position of the receptacle 5 with respect to the roving frame).

Like comparing the 1 and 3 also shows, the roving 3 can either be fed directly to the deposit plate 18 or its internal and helically running deposit channel 21 after leaving the take-off device 6 ( 1 ). This embodiment of the roving frame does not fall under the subject matter of the claim.

According to the invention, the roving 3 first forms a slack 8 and is then fed to the storage plate 18, with one or more sensors 17 and/or an additional guide 20, e.g. B. in the form of a leadership role, may be present. The sensor or sensors 17 monitor the vertical expansion of the slack 8, with a controller (not shown) regulating the rotational speed of the turntable 19 and/or the storage plate 18 on the basis of the measured values of the sensor or sensors 17, as described above, in order to monitor the vertical expansion in within a defined range.

Finally shows 1 that the roving machine has a roving removal 9, for example in the form of a suction tube. If the production of roving is now started, a starting phase takes place first, during which the roving 3 leaving the air spinning nozzle 2 is picked up by the roving discharge 9 and disposed of. If the quality of the roving 3 finally meets the specifications, the roving discharge 9 can be deactivated, with the roving section that has already been discharged from the roving discharge 9 being separated from the roving section with the aid of means (e.g. a cutting unit) that are not shown Air spinneret 2 is produced. The beginning of this section is finally fed to the depositing device 7 and deposited in the receptacle 5, the transfer of the roving section produced last to the depositing device 7 being able to take place, for example, with the aid of a blowing nozzle or mechanical means. The function of the blowing nozzle can also be taken over by the roving discharge 9 if this is subjected to overpressure instead of negative pressure.

With regard to possible recording change processes, reference is made to the above description.

Reference List

1

fiber bandage

2

air spinneret

3

roving

4

outlet

5

recording

6

trigger device

7

storage device

8th

sag

9

roving discharge

10

air nozzle

11

yarn forming element

12

culvert

13

inlet

14

fiber guiding element

15

drafting roller

16

pull-off roller

17

sensor

18

tray

19

turntable

20

guide

21

storage channel

22

loop

23

vortex chamber

Claims (9)

1. A method for processing a strand-shaped fiber bundle (1),

   - wherein the fiber bundle (1) is sent to an air-jet spinning nozzle (2) of a roving frame machine serving to produce roving (3),

   - wherein during normal operation of the air-jet spinning nozzle (2) a twist is imparted to the fiber bundle (1) within the air-jet spinning nozzle (2) with the aid of a vortex air stream, so that a roving (3) is formed from the fiber bundle (1), and

   - wherein the roving (3) finally leaves the air-jet spinning nozzle (2) via an outlet (4) of the air-jet spinning nozzle (2), and

   wherein the roving (3) leaving the air-jet spinning nozzle (2) is deposited in or on a receptacle (5) provided in the region of the roving frame machine,

   - wherein the roving (3) is pulled out of the air-jet spinning nozzle (2) with the aid of a draw-off device (6),

   characterized in that

   normal operation is interrupted by stop phases in which no roving (3) is produced by the air-jet spinning nozzle (2), and

   in that a start phase is passed through between a stop phase and subsequent normal operation, while the roving (3) produced by the air-jet spinning nozzle (2) is at least temporarily not deposited in or on the receptacle (5) after leaving the air-jet spinning nozzle (2), but is disposed of by means of a roving removal device (9), and in that with the aid of a deposition device (7) the roving (3) is deposited in or on the receptacle (5), and in that the roving (3) forms a sag (8) between the draw-off device (6) and the deposition device (7), the vertical spatial extension of which is regulated via the deposition speed of the deposition device (7).
2. The method according to the preceding claim, characterized in that when the receptacle (5) has reached a defined fill level or when a defined amount of roving or length of roving has been produced by the air-jet spinning nozzle (2) and has been deposited in or on the receptacle (5), a receptacle-changing process is carried out during which the filled receptacle (5) is replaced by an empty receptacle (5).
3. The method according to the preceding claim, characterized in that production of the roving (3) is not stopped during the receptacle-changing process.
4. The method according to Claims 2 or 3, characterized in that the roving (3) produced by the air-jet spinning nozzle (2) during the receptacle-changing process is disposed of at least in sections via a roving removal device (9).
5. The method according to Claims 2 or 4, characterized in that production of the roving (3) is temporarily interrupted during the receptacle-changing process.
6. The method according to the preceding claim, characterized in that after the interruption of roving production a start phase is passed through, while the roving (3) produced by the air-jet spinning nozzle (2) is at least temporarily not deposited in or on the receptacle (5) after leaving the air-jet spinning nozzle (2), but is disposed of via a roving removal device (9).
7. The method according to any one of the preceding claims, characterized in that the receptacle (5), after its partial or complete filling with roving (3), is moved to an air-jet spinning machine serving to produce yarn, and in that the roving (3) present in or on the receptacle (5) is spun with the aid of the air-jet spinning machine to form a yarn.
8. The method according to any one of Claims 1 to 7, characterized in that the receptacle (5) after its partial or complete filling with roving (3) is moved to a spinning knitting machine serving to produce a knitted fabric, and in that with the aid of the spinning knitting machine a knitted fabric is produced from the roving (3) present in or on the receptacle (5).
9. A roving frame machine for producing a roving (3) from a strand-shaped fiber bundle (1),

   - wherein the roving frame machine comprises at least one air-jet spinning nozzle (2) for producing roving (3) from the fiber bundle (1) fed to the air-jet spinning nozzle (2),

   - wherein the air-jet spinning nozzle (2) is designed to impart a twist to the fiber bundle (1) within the air-jet spinning nozzle (2) with the aid of a vortex air stream generated by air nozzles (10) of the air-jet spinning nozzle (2), so that a roving (3) is formed from the fiber bundle (1), and

   - wherein the air-jet spinning nozzle (2) has an outlet (4) via which the roving (3) leaves the air-jet spinning nozzle (2) during operation thereof,

   wherein the roving frame machine comprises a deposition device (7) by means of which the roving (3) leaving the air-jet spinning nozzle (2) can be deposited in or on a receptacle (5), and wherein the roving frame machine has a roving removal device (9) for at least temporarily disposing of the roving (3) produced by the air-jet spinning nozzle (2) after leaving the air-jet spinning nozzle (2), and wherein the roving frame machine comprises a draw-off device (6) for pulling the roving (3) out of the air-jet spinning nozzle (2)
   characterized in that the roving frame machine comprises a controller or is connected to a controller that is designed to operate the roving frame machine according to any one of Claims 1 to 6.

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