WO2006012759A1

WO2006012759A1 - Comber

Info

Publication number: WO2006012759A1
Application number: PCT/CH2005/000409
Authority: WO
Inventors: Walter Slavik; Ueli Stutz; Daniel Sommer
Original assignee: Maschinenfabrik Rieter Ag
Priority date: 2004-08-05
Filing date: 2005-07-15
Publication date: 2006-02-09
Also published as: EP1774073B1; DE502005004534D1; JP4903142B2; CN101035937B; CN101035937A; JP2008508442A; EP1774073A1

Abstract

The invention relates to a method and device for the reversal of the hook position of the fibres (F) of a textile material for processing in a process line (PL). According to the invention, the correct hook position in the terminal spinning machine, even with an even number of textile material processing steps between the carder (K) and the ring spinning machine (RS) may be achieved, whereby the hooks (H) are reversed during the process on a combing machine (KM) provided in the process line (PL).

Description

comber

The invention relates to a method of reversing the crochet layer of the fibers in a textile processing line using a comber

In the processing of fibrous material on a carding machine, drag hooks are generated, such as e.g. from the reference "The short staple spinning of VV. Small; Volume 1: General technology of the short staple spinning mill from The Textile Institute (ISBN 3-908.059-01-1) "on page 24. At the end of the process line is, for example, the ring spinning machine on which a thread is formed For the production of the thread on the ring spinning machine, it is advantageous, in particular for their drafting units, if the fibers present in the form of a roving present the fibers which still have hooks in the form of drag hooks, resulting in that between the card and the It is necessary for the ring spinning machine to have an uneven number of further processing stages, provided that the hook layer is obtained at each step, ie when the fiber material is removed from the buffers (eg cans) applied at the processing stages, the fibers are fed in the opposite direction in the subsequent process step ,

In general, a distance before and one after the combing machine is provided, which in conjunction with a preparation machine for winding formation and a flyer again an odd number of machines between the card and the ring spinning machine is present, which the correct orientation of the remaining check mark ( Drag hook).

However, as soon as one of the machines in the process line between the card and the ring spinning machine is removed, appropriate precautions must be taken so that the position of the hook in the ring spinning machine is correct again. It may be, for example, that one of the route passages is removed, provided that the necessary stretching is already carried out on the carding machine or the comber itself. The term "necessary stretching" refers to the drawing to obtain a high-quality intermediate product (For example, a sliver with a desired uniformity), which is further processed in a subsequent process stage.

To achieve a corresponding orientation of the hook position is z.b. has been proposed (DE-A1-41 36 908) that at a process stage in a

Can be used to refill stored fiber material (sliver) in another jug.

As a result, the withdrawal end of the sliver is swept for the subsequent process stage, whereby at the end of the process and the position of the check mark in the

Ring spinning machine again present as Schlepphäkchen.

Devices are also known in which the cans are filled from below and the fiber strip is pulled off from above, the crochet layer remaining the same for the subsequent process.

Furthermore, devices are known to tilt the filled with a sliver at a process stage cans to the front end of the previously deposited

To set sliver at the subsequent textile machine.

These designs are sometimes very expensive and no longer economically acceptable based on the time required today. In addition, additional facilities are required.

The invention is therefore based on the object of a simplified method, or to propose a device to the hook position in at least one

To change process stages of a process line.

This is to ensure that even with an even number of machines between the card and the spinning machine, on which a thread is produced, the hook position in the supplied fiber material to the spinning machine than

Schlepphäkchen present without additional devices for influencing the

Hook position between the textile material processing machines are used. This object is achieved by proposing a method that the check marks are swept during the processing process on a combing machine present in the process line.

Preferably, the prongs are swept following the combing process and prior to forming a combing machine belt.

Furthermore, it is proposed that the end of a fiber mass fed step by step to the combing machine be combed out, from which subsequently a fiber package is withdrawn, which is connected to a previously withdrawn fiber packet to form a fiber fleece, wherein - viewed in the withdrawal direction - the rear end of the fiber packet is brought into overlap with the present rear end of the already previously withdrawn fiber packet, or already present nonwoven fabric.

Furthermore, it is proposed that - seen in the withdrawal direction - the front end of the fiber package is aligned during or after removal against the transport direction of the fiber web.

This can z.b. be achieved by the withdrawn fiber bundle before joining to the end of the fibrous web by at least 90 ° - seen in the withdrawal direction - is rotated.

This can also be achieved if - seen in the withdrawal direction - the front end of the fiber package is aligned during or after removal against the transport direction of the fibrous web.

It can z.b. the withdrawn fiber packet before joining to the end of the fiber web by at least 90 ° - seen in the withdrawal direction - are rotated.

To carry out the method, a combing machine is proposed, which has means for sweeping the hooks following the combing process and prior to forming a combing machine belt. In this case, the combing machine has an aggregate for feeding a pulp to a combing device, wherein the combing device combs out the end of the pulp gradually introduced and clamped by the unit, from which a fiber package is withdrawn with a subsequent take-off device which delivers the fiber package to another device, to bring the ends of the previously withdrawn fiber bundle and the new fiber package in coverage, the further device is provided with means which - seen in the withdrawal direction - the rear end of the new fiber package with the rear end of the previously withdrawn fiber packet, or the The end of the already formed fiber fleece overlaps.

In known combing machines, the wadding web drawn off from a wadding roll is placed over a pair of pliers by means of a feed roll for combing out a round comb arranged below the pliers. During the combing process, the reciprocating pliers are closed, whereby the cotton wool end protruding from the nip of the pliers (also called fiber tuft) is grasped and combed out by a comb segment of the round comb. Subsequently, the forceps is pivoted to a front position and opens it. In this case, the free end of the tuft passes into the region of the end of a previously formed fiber fleece, which has been conveyed back by a Reversierbewegung of a Abreisswalzenpaar by a certain amount to set a new combed fiber package. In this piecing process, the direction of rotation of the tear-off rolls is again in the transport direction. The combed tuft now lies like a roof tile with a predetermined overlap on the end of the

Faservlieses and passes through the rotational movement of the tear-off rollers in the nip of the tear-off rollers. During this process, a fixed comb mounted on the pliers usually appears in the tuft. The latter then has the task of retaining shell parts and nits and also short fibers during the tear-off process, which are located in particular in the region of the tuft which has not been grasped by the comb segment of the circular comb. Upon further rotation of the tear-off rollers, the fibers covered by the nip line become which are not retained in the forceps in the form of a fiber package and soldered to the end of the fiber web over the clamping action of the tear-off rollers. This process is repeated with each comb play. This means that the direction of rotation of the tear-off rollers must be reversed before each new tear-off or piecing process (soldering process). Since this process must be carried out approximately 350 to 400 times per minute depending on the height of the Kammspielzahl, complex and stable gear units are necessary to perform on the one hand a correspondingly necessary rotational movement and on the other hand to control the high accelerations and Reversierbewegungen occurring.

It is therefore proposed a device with which on the one hand the hook position can be swept and on the other hand can be dispensed with the above-described reversing.

It is proposed, a first circulating means which is provided on its periphery over its circumference with openings for an air passage and at least a portion of the interior of the means is connected to a vacuum source and a casing is provided, which is a foreclosed against the environment space forms between the extraction device and the periphery of the rotating means, wherein a portion of the sealed space is formed by the periphery of the means and by the extraction device.

With this device, it is possible to safely lead the output from the Abreisswalzen fiber package even at high Kammspielzahlen and attach to the end of the previously formed nonwoven fabric after sweeping the hooked position (or to be soldered). With the claimed embodiment, it is possible to perform the piecing process for the soldering and sweeping process in a room in which it is now possible to control the air flows exactly, thereby avoiding disturbing and uncontrolled air circulation. Experiments have shown that the control of the air flows in the delivery area of the fiber packages are of enormous importance in order to be able to carry out controlled soldering and reversing even at high delivery rates. The term "shielded from the environment" does not mean that the claimed space is completely "airtight" from the ambient air. That is, there may still be openings for the air inlet, which serve in particular to compensate for the extracted via the vacuum source air volume again. Such openings can z. B. between the sweeter boundary of the casing and the trigger device may be provided. With a targeted attachment of such openings and the air flow with respect to the sweeping and applying the delivered fiber packet can be accurately aligned and influenced. Preferably, the foreclosure of the space to the ambient air is between 80% and 99%, whereby the tracking of air from the environment is ensured in the foreclosed room.

The height of the portion of the openings for the air inlet in the foreclosed space depends z. B. after the required vacuum within the room during the sweeping or soldering.

Furthermore, it is proposed to provide within the revolving means (T) at least a second means (Z), via which at intervals in synchronization with the delivery of the fiber packets (P) of the free air passage, at least over a portion of the openings (35) between the Environment of the first means (T) and the vacuum source (Q) is controllable.

By means of the negative pressure applied via the negative pressure source to the periphery of the first means at the right time, the delivered fiber packet can be held accordingly and then placed on the end of the fiber fleece with a desired coverage and alignment of the remaining hooks.

Preferably, the second means proposed within the first means is connected to a drive and provided with at least one opening on its circumference, which extends approximately over the width of the withdrawn fiber packet and via which a connection between the air passages of the first means and the negative pressure source can be produced. The second means serves as a kind of control element for the connection between the openings of the first means with the vacuum source. To ensure the synchronization described, the drive of the second means are in drive connection with the drive of the extraction device.

In order to reliably seal off corresponding areas against the vacuum source, it is further proposed to provide at least one cover element within the first means.

Preferably, the first means consists of a rotatably mounted screening drum, within which the second means is arranged as a rotatably mounted cylinder.

To influence the necessary for the transfer process air flow is proposed that the speed of the second means is a simple or a multiple of the Kammspielzahl the combing machine.

With a corresponding design of the second means, in particular with regard to the number of its distributed around its circumference openings, it is also possible that the speed of the second means a fraction of the Kammspielzahl the

Can amount to comber. It must be guaranteed only the exact application of the newly delivered fiber package.

It is also conceivable that depending on the application, the speed of the first or second means controllable, or designed adjustable. In particular, with the variation of the speed of the second means can influence the soldering (soldering distance).

Furthermore, it would also be conceivable to change the direction of rotation of the first or second means. The directions of rotation of both means can also be in opposite directions. It is further proposed to mount the cover or the element within the second means or as a further solution between the first and second means. Such a covering agent will be z. B .. be provided in the region in which the fiber mat formed on the first means must be removed in order to supply it to a subsequent further processing.

Furthermore, the second means may have two mutually offset on its circumference arranged openings and at least two offset from each other covering elements may be provided. This allows a further embodiment.

In order to ensure the adherence of the fiber web already formed on the circumference of the screen drum during removal, it is proposed that further smaller openings are provided distributed on the circumference of the second means, which extend over only a partial area with respect to the width of the withdrawn fiber packet , This constantly creates a small negative pressure on the periphery of the screen drum, which builds up in the gap between the screen drum and the cylinder, since the gap is constantly connected to the vacuum source in combination. However, the effect of this low negative pressure has no effect on the transfer of the fiber package from the discharge device to the screen drum and serves only to hold already described the fiber web on the screen drum.

The shuttering may preferably be made of a transparent material so as to give the operator an insight into this area without having to disassemble the shuttering. This can also be advantageous with regard to possible cleaning work or for the timely detection of sources of interference.

So that in the area of the casing no flurry or other soiling can settle, it is proposed that at least parts of the

Cladding made of an antistatic material. For active and targeted influencing of the air flows within the enclosed space, it is proposed that at least one adjustable element be provided in the region of the casing, which is suitable for controlling at least one opening for an air passage between the sealed space and the ambient air of the casing.

In this case, the element may consist of a flap which can be pivoted about a pivot axis and which extends transversely to the transport direction of the nonwoven fabric substantially over the length of the take-off device. Advantageously, it is proposed that the pivot axis of the flap is arranged in the region below the extraction device and shows the free end of the flap in the direction of the trigger device.

In order to ensure a safe storage of the fiber package on the screen drum, it is proposed to attach the flap so that the free end of the flap in the open position with the first means forms a nip.

Also, to prevent unwanted air circulation in the discharge area of the trigger device, it is proposed that a cover (boundary) is provided between the trigger device and the periphery of the first means, which at least partially closes the existing clearance.

In order to remove the nonwoven fabric from the first means, it is proposed that the first means be provided with a removal device for removing the nonwoven fabric formed on the means.

Advantageously, the removal device is following the limitation of

Shuttering arranged.

The removal device can be a pair of rollers.

It is also conceivable to provide a removal device, wherein a take-off roller interacts directly with the sieve drum. To form a sliver for subsequent processing, or for storage in a jug, the removal device may be a sliver-forming device. For example, the roller pair may be followed by a known fleece funnel for band formation.

So that the negative pressure of the vacuum source is applied mainly only in the region in which the fiber packet is to be set, the radial distance between the first means and the second means is to be kept relatively low in order to avoid unwanted air flows. It is proposed that the radial distance between the screen drum and the cylinder is between 0.2 and 2 mm.

Further advantages of the invention will be shown and described in more detail with reference to the following embodiments. Show it:

1 shows a schematic partial view in the withdrawal or soldering area of a comber according to the known prior art.

A schematic side view of an inventive embodiment in the range of the trigger device.

2a a schematic side view of a further embodiment of the

invention

2b shows another view of the example of Fig. 2a

3 shows a sectional view A-A according to Fig.2

4 shows a schematic representation of a known process line

5 shows a schematic representation of a process line according to the invention Fig. 1 shows an embodiment of the prior art. In this case, the supplied from a nipper unit 1 cotton wool 2 via a feed cylinder 3 a take-off roller pair 5 (also called Abreisswalzenpaar) supplied. The outstanding from the open forceps 1 tuft 7 thereby passes to the rear end 8 of a Kammzugvlieses, or nonwoven fabric 10, whereby it passes 5 due to the forward movement of the take-off rollers in the nip of the take-off rolls. The fibers, which are not held by the retention force of the wadding or by the forceps, torn out of the composite of the wadding. In this tearing off the tuft is additionally pulled through the needles of a Fixkammes 9. The Fixkamm 9 causes the combing out of the rear part of the withdrawn tuft as well as the retention of nits, impurities and the like. Due to the differences in speed between the wadding web 2 and the withdrawal speed of the tear-off rolls, the drawn-off tuft is warped to a certain length. Following the Abreisswalzenpaar a pair of guide rollers 6 is arranged. In this tearing off, there is an overlap or doubling of the front end of the demolished, or withdrawn fiber packet with the rear end 8 of the fiber web 10. As soon as the tearing off, or the soldering process is completed, the pliers returns to a rear position in which it is closed and presents the tuft protruding from the tuft 7 a comb segment 12 of a circular comb 13 for combing out. Before now the nipper unit 1 returns to its forward position, the take-off rollers 5 and the guide rollers 6 perform a reversing, whereby the rear end 8 of the fiber web 10 is conveyed back by a certain amount. This is necessary to achieve a necessary coverage for the soldering process.

In Fig. 2, an inventive embodiment is shown, wherein the take-off rollers 5 no reversing must perform more. That is, the withdrawn from the take-off rolls fiber package P is discontinuously discharged to a subsequent drum T under the influence of an air flow L and attached to the end E of the already formed nonwoven fabric V, as will be described in more detail below.

In the sectional view A-A according to Figure 2, it can be seen in Figure 3 that the screen drum T is rotatably mounted on a flange 21 via a bearing 20. The flange 21 is fixedly connected to a cylinder Z. About the flange 21 of the cylinder Z is rotatably mounted on a shaft 24. The shaft 24 is mounted on a bearing 22 flying in the machine frame MG. Of course, the shaft 24 is also secured in its axial position (not shown). In the end region of the screen drum T, in which the bearing 20 is located, a pulley 26 is connected to the screening drum and at the same time forms the lateral conclusion against the ambient air. Via a schematically illustrated belt 27, which rests on the pulley 26, this is driven by a drive not shown in detail, which is in drive connection with the transmission G. The drive of the transmission via a motor M, which is controlled by a control unit ST. Outside the interior IR of the screen drum T is a drive wheel 30 rotatably mounted on the shaft 24. This drive wheel 30, which is e.g. may be a gear, a sprocket or a pulley is connected to the gear G via a schematically shown drive connection 31 in connection.

On the, the bearing 20 opposite end face is on the shaft 24 a

Channel 33 attached to the machine frame MG. The tubular channel 33 protrudes with its end face 32 in the inside diameter of the cylinder Z and thus seals off the interior IR against the ambient air. Between the fixed channel 33 and the rotating screen drum T sealing elements 38 may be provided for further sealing. It is also possible to use these elements as

Form bearing means to additionally support the screen drum T on this side on the channel 33.

In the channel 33 opens a channel 34 which communicates with a vacuum source Q in connection. The end face 32 of the channel 33, which projects into the screen drum T, is provided with an opening 36, via which, as indicated schematically by arrows, the air flow from the interior IR of the screen drum to the vacuum source Q can take place. The screen drum T is, as shown schematically, provided with a plurality of openings 35 which are distributed over its entire circumference. Instead of a screen drum made of metal, plastic or other solid materials, which is provided with openings on its circumference, it would also be possible to use a fabric or other fabric, which has a certain air permeability. This fabric would have to be mounted on a scaffold accordingly.

On the front side 32 of the channel 33 are via fastening means, for. B. screws 37, the cover elements A1 and A2 attached, which, as can be seen in particular from Figure 2, over a portion of the peripheral region on the inside of the

Screen drum T extend.

The cover elements A1 and A2 are on the inside of the circumferential

Cylinder Z arranged at a small distance. However, it is also possible the; Cover elements A1 and A2 between the screen drum T and the cylinder Z ^"to be arranged stationary.

In the present example of Figure 3, a small radial distance a is provided between the screen drum T and the cylinder Z, which may be between 0.2 and 2 mm. In this radial clearance between the screen drum and the cylinder T a Z ¹ is less negative pressure is generated as soon as the vacuum source is effectively switched Q ^'. This low negative pressure is used, as will be explained further below, for holding the fibrous web V already formed on the screen drum, at least in the region in which no cover element A1, or A2 is attached. For a connection between the interior IR, which is connected to the vacuum source Q, with the radial clearance between the drum T and the ^; Cylinder Z at any time, several small openings 53 can be provided on the circumference of the cylinder Z. The size and number of these openings 35 is chosen so that the piecing, or soldering on the screen drum T is not affected thereby. In the embodiment shown, only three such openings are shown in a line. However, a plurality of such openings 53 may be arranged distributed on the circumference of the cylinder Z. 2, which are mounted in the cylinder Z, a section of the screen drum T provided with openings 35 can be connected to a vacuum source Q. The cover member A2 is mounted in the region of take-off rollers 40, so that the nonwoven fabric V can be easily removed from the drum T via the driven rollers 40. This fiber fleece V is supplied by the rollers to a subsequent fleece funnel 41, in which the fleece is combined from the width B (FIG. 3) to a fiber sliver FB (combing machine belt). Such devices of fleece summary are already known in many variations in combers, cards or even on routes, which will not be discussed here.

The fiber sliver FB formed at the fleece funnel 41 can be deposited in a can 44 via a funnel wheel 43. It is also conceivable to deliver the formed sliver FB to a conveyor table and to feed it with further slivers of adjacent combing heads to a following drafting system (not shown). A further cover element A1 is arranged in the delivery area AG, which in particular serves to control the air flows in conjunction with the openings S1 and S2 in order to correspondingly reverse the fiber package for reversing the hook position.

To control the air flow L, which is essential for the piecing process of the fiber package P to the web V, above the screen drum T, a stationary cover 46 is mounted. The cover has, as shown schematically in Figure 3, lateral walls 47 which extend on both end sides of the cover 46 into the region of the circumference U of the screen drum T. This results in connection with the peripheral surface U of the screen drum T and the take-off rollers 5 a foreclosed against the environment space AM. The distance between the cover 46 and the screen drum is reduced to the area of the subsequent take-off rollers 40 to avoid unwanted air currents.

Below the screen drum T, a further cover 54 is provided, which is also, like the cover 46, provided with side walls 57, the up to protrude to the sieve drum. For foreclosure against the environment, the cover 54 is provided at its one end region with an angled portion 54a, which has only a small distance from the peripheral surface U. The opposite end of the cover 54 extends to the peripheral surface of the upper roller of the take-off rollers fifth

The nonwoven fabric V is fed by the rollers 40 to a subsequent nonwoven funnel 41, in which the nonwoven of the width B (FIG. 3) is combined to form a fiber sliver FB. Such devices of fleece summary are already known in many variations in combers, cards or even on routes, which will not be discussed here.

The fiber sliver FB formed at the fleece funnel 41 can be deposited in a can 44 via a funnel wheel 43 or fed to a subsequent drafting arrangement with further slivers of adjacent combing heads on a conveyor table. In the example shown in FIG. 2, both the screen drum T and the cylinder Z have an identical direction of rotation in the counterclockwise direction. The peripheral speed of the cylinder Z coincides with the peripheral speed of the take-off rollers 5. D. h. the rotational speed of the cylinder Z must run synchronously with the comb play in order to carry out the piecing process or soldering process synchronously with the delivery of the fiber package. However, it is also possible to select the rotational speed of the cylinder Z by a multiple with respect to the comb play, without the synchronization is lost. It is also possible to drive the cylinder Z at a speed which gives a fraction of the peripheral speed of the cylinder in relation to the take-off rolls. However, it is necessary that the number of openings in the cylinder according to the intended fraction is available. Corresponds z.b. the circumferential speed of the cylinder Z is half the peripheral speed of the take-off rollers 5, the cylinder must have twice the number of openings S1 in order to carry out the piecing operation. That in one revolution of the cylinder Z, two soldering operations are performed.

The speed of the screen drum T is much slower than that of the cylinder Z and is aligned according to the piecing process. With the change of the speed the sieve drum, the soldering distance, or the overlap of the end E with the rear end HE of the fiber package P can be changed.

In the example shown in FIG. 2, the front end VE of the fiber bundle P is already in the area of the screen drum T. Via the opening S2 of the rotating cylinder Z, the space between the cover 54 and the screen drum T is opened via the openings 35 of the screen drum T. connected to the vacuum source Q, which can be controlled via a control unit ST. The resulting air flow L1 is oriented counter to the direction of rotation of the screen drum and causes the front end of the VE supplied by the take-off rolls P is deflected downwards. The positioning of the opening S2, or S1 is exactly matched to the delivery process of the fiber package P through the take-off rollers 5, to produce the described air flow. The opening S1 is still behind the cover A1 and thus has no connection to vacuum source Q. The front end VE is held by the air flow L1 on the circumference U of the screen drum T.

In the further process, the end HE of the fiber package P is released from the take-off rollers 5. At the same time, the opening S1 moves outside the cover area of the cover A1 and causes by the connection with the vacuum source Q and the openings 35, that an air flow is generated, with the released end HE of the fiber package P on the screen drum T in the direction of rotation on the End E of the already formed nonwoven fabric V hangs up, or covered with this. The opening S2 has moved behind the cover A1, whereby the air flow L1 has been interrupted. With this piecing process, the fiber packet was rotated during the preparation, whereby the Häkcheniage has been swept.

This process is repeated with each comb play, whereby the fiber web V again and again set up a new fiber package P at a uniform speed of the screen drum T and a reversal of the hook position is made. As soon as a new end VE is delivered from the take-off rolls 5, the first opening S1 is located in the region of the cover 54 to produce an air flow L1 which deflects this end VE downwards counter to the direction of rotation of the drum. As soon as the opening S1 behind the cover A1 disappears, this function is taken over from the opening S2 up to the process already described, where the rear end HE of the fiber packet P is released.

The covering of the rear end HE of the fiber bundle P with the end E of the fiber web V can, as already described, be determined by the rotational speed of the screen drum T.

The fiber fleece V is transferred by the rotational movement of the screen drum T in the removal area AB of the rollers 40, in which also the stationary attached cover member A2 is arranged. This ensures that this area is sealed off from the vacuum source Q, whereby the

Nonwoven fabric can be easily lifted from the peripheral surface U, in order to convert this into the nip between the take-off rolls 40. About these driven rollers 40 (drive is not shown), the nonwoven fabric V is discharged into a fleece funnel 41, which are also driven downstream take-off rollers 42. In the nonwoven funnel 41, the nonwoven fabric V is combined in a known manner into a fiber sliver FB, which is drawn off from the take-off rolls 42 and placed in a loop 44 in a can 44 via a funnel wheel 43 shown schematically. The fiber sliver FB thus deposited can subsequently be used for further processing, for example. be transported to a flyer or an open-end machine with the pot 44.

The exemplary embodiments of FIGS. 2 a and 2b differ, for example, from FIG. 2 or FIG. 3 by the attachment of a pivotable flap KL in the region of the casing 46, the attachment of the lower casing 54 being dispensed with.

By the shuttering 46 in conjunction with the corresponding side walls 47 and the boundary through the screen drum T and the take-off rollers 5 creates a sealed against the ambient air space AM, within which the sweeping and soldering process traded fiber packets P to the already formed nonwoven fabric V is carried out. In order to better control this process even at high delivery speeds of the fiber packages, the use of a flap KL is proposed in the examples of Fig. 2a and Fig. 2b, which is pivotally mounted about a pivot axis SA. The pivot axis SA can be mounted in the machine frame or directly on the cover 46.

On the pivot axis SA, which z. B. is laterally pivotally mounted in the region of the hood 46 or on the machine frame, engages a pivoting device 70, which is controlled via the line 72 by the controller ST. In this pivoting device, it may be z. B. act to a cylinder which is hinged to a lever which is rotatably connected to the pivot axis. The control of the pivoting device 70 takes place via the control ST in synchronism with the movement of the draw-off rolls, or in particular synchronously with the position of the openings S1, S2 of the cylinder Z.

In the position shown in Fig. 2a, the flap KL is in a closed position, in which the free end of the flap approximately tangent to the circumference of the lower take-off roll 5a. Ie. there is only a small safety distance between the lower take-off roll 5a and the flap KL available. The front end VE of the fiber bundle P is deflected downward by the air flow prevailing with arrows L. Under the influence of the im

Inside the screen drum applied negative pressure and the corresponding position of the opening S1 of the cylinder Z, the end VE is sucked onto the circumference U of the screen drum T. In this case, the front end VE of the fiber package P opposite to the direction of rotation of the screen drum T. Between the cover 46 and the upper take-off roll 5b, a gap 65 is present, through which air can flow from the environment.

The resulting air flow L ensures that the reversal of the fiber package and the laying of the front end VE on the screen drum T even at high delivery speeds without damaging the Fasergemenges.

Upon further rotation of the cylinder Z, the opening S1 is moved behind the cover A1 and is thus sealed off from the vacuum source Q. With the Displacement of the opening S1 is simultaneously displaced the opening S2 in the position shown in Fig. 2b, whereby an air flow in the direction of the removal device 60, 61 is formed, as indicated by arrows L. Simultaneously with the displacement of the openings S1 and S2, the pivoting device 70 is controlled via the line 72 by the controller ST and causes the pivoting of the flap KL in the position shown in Fig. 2b. This position is assumed shortly before the release of the rear end HE of the fiber pack by the take-off rollers 5. The result is a clamping point KS between the screen drum T and the free end of the flap KL, whereby the front end of the fiber package VE is securely held in the system on the screen drum when the rear end HE is released by the take-off rolls. About the resulting by the pivoting of the flap KL opening 90 is now another air flow in a tangential direction to the rotational movement of the screen drum T, whereby the shared end HE is brought into coincidence with the rear end E of the already formed fiber web V.

This air flow L results from the corresponding position of the opening S2 via which the front region of the hood 46 is placed under negative pressure. The case extracted air volume is z. B. partially tracked over an existing gap 65 and mainly through the opening 90 again, as indicated by corresponding arrows. The second opening S1 is located behind the cover A1 and is therefore out of action.

When this process is completed, the flap KL is pivoted back into the position shown in Fig. 2a, which again a new fiber package P can be supplied from the take-off rollers 5 for further preparation. By using the flap KL, the soldering process of the fiber packages on the screen drum can be carried out easily and selectively, even at high delivery speeds of the fiber packets, without damaging the fiber packets during the piecing process.

In particular, it is possible via the flap KL to control or influence the air flows necessary for the piecing process. Instead of the flap KL, the attachment of additional openings would also be conceivable, which can be closed or opened by means of a device at the appropriate time via a corresponding control.

FIGS. 4 and 5 schematically show a process line PL between a carding machine KA and a ring spinning machine RS. The check mark position of the hooks H of individual fibers F, as they are present at the individual process stages, is shown schematically. In the known process line according to FIG. 4, the fibers discharged from the carding machine KA are supplied with drag hooks and discharged into a can K1. The jug K1 serves as a template for a subsequent stretch SI where the fibers F after removal from the jug K1 with Kopfhäkchen reach the route SI. After the drawing process, the fiber material is deposited in a jug K2, which serves as a template for a subsequent winding-forming machine WM. After removal from the can K2, this fiber material reaches the winding-forming machine WM with drag hooks. The cotton roll WW produced there is transferred to a subsequent combing machine KM. The Wattebahn wound on the comber from the cotton roll WW has fibers with Kopfhäkchen, which are partially resolved on the combing machine. The sliver formed on the comber still has Kopfhäkchen, which have not yet been resolved. This sliver is deposited in a can K3, which serves as a template for a subsequent second route passage S Il. After removal from the can K3 the fibers still provided with hooks H are supplied with Schlepphäkchen in the route S Il. The sliver formed at the distance S Il is deposited in a pot K4. The pot K4 is then transferred to a flyer FL, in which the fibers are present with Kopfhäkchen after the sliver has been removed from the pot K4. The coil SP produced by the flyer FL is then transferred to a ring spinning machine for further processing. When unwinding the spool SP on the ring spinning machine RS are still provided with checkmark H fibers in the form of Schlepphäkchen, which is for this last processing process of advantage. This means that if there were any headers, the processing would be at the Ring spinning machine are disturbed and may lead to quality losses in yarn production.

To rationalize and thus also to save costs, efforts are always made to shorten the process line PL with consistent quality of the end product. There are already proposals available z.b. to save the second route stage S Il. This can z.b. be achieved by a regulated drafting on the combing machine. However, this would result in a process step, whereby the remaining hooks would be present as unwanted Kopfhäkchen in the ring spinning machine. This is where the invention begins and proposes to carry out the rotation of the crochet layer during the processing process on the combing machine KM, as shown schematically in FIG. The fibers, which are delivered to the comber in a sliver, with Schlepphäkchen before. In the subsequent process, while avoiding the drafting stage S II, the fibers ultimately reach the ring spinning machine via the Flyer FL with drag hooks.

It goes without saying that the fiber material can also have mixed forms of towing and Kopfhäkchen as well as Doppelhäkchen. If previously spoken by towing or Kopfhäkchen in the embodiments, the majority of Häkchenformen in each available fiber amount is the speech.

The combing machine is particularly suitable for reversing the position of the hook, especially since the fiber material is separated into individual fiber packets during the processing there, which can then be swept accordingly.

Claims

claims

A method for reversing the crochet position of the fibers (F) of a textile material to be processed in a process line (PL), characterized in that the hooks (H) are applied during the processing process to a fabric in the

Process line (PL) existing comber (KM) are swept.

2. The method according to claim 1, characterized in that the hooks (H) are swept after the combing process and before the formation of a combing machine belt (FB)

3. The method according to claim 2 that on the combing machine (KM) gradually fed and clamped end (7) of a fiber mass (2) is combed, from which then a fiber package (P) is withdrawn, which is used to form a nonwoven fabric (V) is connected to a previously withdrawn fiber packet (P), wherein - seen in the drawing direction (AR) - the rear end (HE) of the fiber bundle (P) in overlap with the present rear end (E) of the previously withdrawn fiber packet, or already present nonwoven fabric (V) is brought.

4. The method according to claim 2, characterized in that - seen in the drawing direction (AR) - the front end (VE) of the fiber package (P) during or after the removal against the transport direction of the fibrous web (V) is aligned.

5. The method according to claim 2, characterized in that the withdrawn fiber bundle (P) before joining to the end (E) of the fibrous web by at least 90 ° - seen in the withdrawal direction - is rotated.

6. Combing machine for carrying out the method according to claim 1, characterized in that the combing machine (KM) means (T ₁ Z) to the hook (H) following the combing process and prior to formation of a Combing machine belt (FB) to sweep.

7. combing machine according to claim 6, characterized by an aggregate (1) for supplying a fiber mass (2) to a combing device (12,13), wherein the combing device from the unit (1) gradually submitted and clamped

Combs out end (7) of the fiber mass, from which a fiber bundle (P) with a subsequent take-off device (5) is withdrawn, which emits the fiber packet (P) to another device (T, Z) to the ends (E) of the previously the other device with means (T, Z) is provided, which - seen in the drawing direction (AR) - the rear end (HE) of the new fiber package (P) with brings the rear end (E) of the already previously withdrawn fiber bundle, or the end of the already formed nonwoven fabric (V) in registration.

8. combing machine according to claim 7, characterized in that the further device comprises a first circulating means (T) which is provided on its periphery (U) over its circumference with openings (35) for an air passage and at least a portion of the interior of the By means (T) with a vacuum source (Q) is connected and a casing (46, 47) is provided, which is a sealed off from the environment space (AM) between the trigger device (5) and the periphery (U) of the rotating means (T ), wherein a portion of the partitioned space (AM) is formed by the periphery (U) of the means (T) and by the extraction device (5).

9. Combing machine according to claim 8, characterized in that the foreclosure of the space (AM) relative to the ambient air is between 80% and 99%.

10. Combing machine according to one of claims 8 to 9, characterized in that within the circulating means (T) at least a second means (Z) is provided, via which in time intervals in synchronization with the delivery of the fiber packets (P) of the free air passage, at least over a portion of the openings (35) between the environment of the first means (T) and the vacuum source (Q) is controllable.

11. comber according to claim 10, characterized in that the second means (Z) with a drive (M, G) is connected and having at least one opening (S 1, S2) on its circumference, which extends approximately over the width ( B) of the withdrawn fiber packet (P) and via which a connection between air passages (35) of the first means (T) and the vacuum source

(Q) can be produced.

12. combing machine according to claim 11, characterized in that within the first means (T) at least one stationary cover member (A1, A2) is mounted, which a portion of the air passages (35) of the first means

(T) relative to the vacuum source (Q) over the width (B) of the peeled fiber package (P) sealed off.

13. Combing machine according to claim 10 to 12, characterized in that the first means consists of a rotatably mounted screening drum (T), within which the second means is arranged as a rotatably mounted cylinder (Z).

14. combing machine according to claim 10 to 13, characterized in that the rotational speed of the second means (Z) is a simple or a multiple of the Kammspielzahl the combing machine (KM).

15. Combing machine according to one of claims 10 to 13, characterized in that the rotational speed of the second means (Z) is a fraction of the Kammspielzahl the combing machine (KM).

16. Combing machine according to one of claims 14 to 15, characterized in that means (ST, M, G) are provided for the rotational speed of the first and / or second means (T, Z) to control or adjust.

17. comber according to claim 14 to 16, characterized in that means (ST, M, G) are provided to adjust the direction of rotation of the first and / or second means (T, Z).

18. Combing machine according to one of the preceding claims 12 to 17, characterized in that the cover element (A1, A2) within the second means (Z) is arranged.

19. Combing machine according to claim 17, characterized in that the second means (Z) has two mutually offset on its circumference arranged openings (S 1, S2) and at least two mutually offset cover elements (A1, A2) are provided.

20. comber according to claim 11, characterized in that distributed on the circumference of the second means (Z) further smaller openings (53) are provided, which extend only over a partial area with respect to the width of the withdrawn fiber packet.

21. Combing machine according to claim 8, characterized in that at least parts of the casing (46, 47, 54, 57) consist of a transparent material.

22. Combing machine according to one of claims 8 or 21, characterized in that at least parts of the casing (46, 54) consist of an antistatic material.

23. Combing machine according to one of claims 8 to 22, characterized in that in the region of the casing (46, 47) at least one adjustable element

(KL), which is suitable, at least one opening (90) for an air passage between the foreclosed space (AM) and the ambient air the shuttering (46, 47) to control.

24. comber according to claim 23, characterized in that the element consists of a, about a pivot axis (SA) pivotable flap (KL), which - seen transversely to the transport direction of the fibrous web (V) - substantially over the length of the trigger device ( 5) extends.

25. combing machine according to claim 24, characterized in that the pivot axis (SA) of the flap (KL) in the region below the take-off device (5) is arranged and the free end (KE) of the flap in the direction of

Trigger device shows.

26. Combing machine according to claim 24, characterized in that the free end (KE) of the flap (KL) in the open position with the first means (T) forms a clamping point (KS).

27. Combing machine according to one of the preceding claims 8 to 25, characterized in that the first means (T) is provided a removal device (40) for removing the on the means (T) formed nonwoven fabric (V).

28. Combing machine according to claim 26, characterized in that the removal device (40) is arranged following the boundary (54a) of the shuttering (46, 54).

29. Combing machine according to one of claims 26 or 27, characterized in that the removal device is a pair of rollers (40).

30. Combing machine according to one of claims 26 to 27, characterized in that the removal device (40) is a sliver (FB) forming device (41, 42) connected downstream.

31. comber according to claim 13, characterized in that the radial distance (a) between the screen drum (T) and the cylinder (Z) is between 0.2 and 2 mm.