EP2452001B1 - Apparatus for forming a sliver - Google Patents

Description

The invention relates to a device for forming a sliver of a formed at a Kämmstelle a comber nonwoven fabric according to the preamble of the main claim.

Devices are known in practice, wherein the, formed at a combing point of a combing machine nonwoven fabric is fed to a nip of a pair of rollers and then eccentrically (transversely) withdrawn and fed to a funnel for band formation. In this case, the funnel (also called compressor) is followed by a calender roller pair connected to a drive, via which the fiber sliver formed is delivered to a subsequent conveyor table. Such a device is z. In the published DE 103 00 317 A1 shown and described.

Furthermore, from the WO 2006/012758 A1 a device known, wherein the, withdrawn from a take-off device and combed fiber packets for web formation on a, associated with a vacuum source screen drum are discharged. The screen drum is provided with a drive and conveys the formed nonwoven fabric in the direction of a nip of a pair of withdrawal rollers over which the nonwoven fabric is removed from the screen drum and fed to a subsequent hopper for compaction and summary to a sliver. Following the funnel, the compacted fiber material is fed to a driven calender roller pair, wherein a further compression of the now present sliver takes place.

A similar device is also from the publication of EP 370340 refer to.

In the known designs special drive axles for driving the calender rolls are necessary. In addition, special guides are necessary to transfer the nonwoven fabric from the nip of the take-off rolls to the hopper with the subsequent calender rolls. In the area of these guides, it can lead to incorrect distortion in the fiber material and contamination by fiber fly.

The invention now has the task of proposing a device for forming a sliver of non-woven fabric on a comber, which improves the known solutions and a compact and inexpensive device is achieved while reducing the required drive axles.

This object is achieved by proposing that the nonwoven fabric - as seen in the conveying direction - is transferred to the funnel and the subsequent press roller pair following the nip of the roller pair in the area of the peripheral surface of the driven roller and one of the press rollers of the press roller pair rotatably and coaxially the driven roller is arranged. In this case, the press roller may be connected directly to the driven roller or fixed against rotation on the drive axle of the driven roller.

This makes it possible to save at least one special drive axle of the calender roller pair, since one of the calender rollers is fastened directly and coaxially on the drive axle of the driven roller of the roller pair. In addition, this ensures that the speed of the nip forming the pair of rollers and the Kalanderwalzenpaares are absolutely identical and thus false distortions are excluded. Furthermore, no additional guidance is required for the nonwoven on the way from the nip to the hopper, since the nonwoven is guided directly in the area of the peripheral surface of the driven roller.

The term "funnel" is generally to be understood as a "compaction element" in order to combine a fiber mass into a sliver, which in this case is fed to a subsequent calender roller pair for further compaction. In this case, the funnel takes over by an appropriate shape design and the task of feeding the sliver exactly the nip of the calender roll pair.

In order to support the guidance of the fiber fleece on the peripheral surface of the driven roller, it is further proposed that, between the nip of the roller pair and the hopper, at least one stationary guide means for the fiber fleece extending in the region of the circumferential surface of the driven roller is arranged.

For the lateral summary of the fiber fleece and the defined transfer of the combined fiber web to the hopper, an embodiment is proposed, wherein the guide means has at least one side guide which projects into the conveying path of the fiber fleece and which extends at an acute angle to the axis of rotation of the driven roller to the hopper ,

This ensures that even the edge areas of the fibrous web when merging targeted and without damage to the funnel are performed. The term "guide means extending in the region of the peripheral surface" also includes those solutions in which the guide means do not exactly follow the contour of the peripheral surface of the driven roller. This will be explained in more detail in the following embodiments.

In order to lift the non-woven fabric from the rotating surface of the driven roller following the nip and for gentle transfer to the hopper, it is proposed that the guide means be provided with a lower guide surface which extends in the area of the peripheral surface of the driven roller and the non-woven fabric on its Bottom supports during transfer to hopper.

Advantageously, it is further proposed that the hopper and the guide means are interconnected. It is advantageous if the funnel and the guide means are formed as a molded part of one piece.

This allows the production of a guide means with integrated funnel, wherein the guide surfaces can be optimally designed without disturbing interruptions to a gentle guidance of the fiber web. This can still be supported by the appropriate design of the surface of the guide means. Furthermore, the one-piece molded part can be produced as a molded part made of plastic, whereby the shape is freely designable.

Preferably, the press roll mounted on the roll is secured to one end of the roll which is outside the area of the nip. Thus, the take-off area through the funnel is outside the supplied width of the fleece, whereby a complete distribution of the solder joints is made possible (as in the example of DE 103 00 317 A1 has been described).

Furthermore, it is proposed that the rotatably mounted press roll, which forms the press roll pair with the press roll mounted on the roll, is mounted so as to be movable transversely to its axis of rotation and is acted upon by a spring element in the direction of the press roll fastened on the roll.

By the further proposal that at least one sensor is provided which scans the movement of the movably mounted press roll, it is possible to provide a continuous monitoring of the sliver formed.

It is therefore further proposed that a control unit is provided to evaluate the output from the sensor to the control unit signal for determining mass nonuniformity (CV value). Thus, one obtains continuously a quality feature of the formed sliver at the corresponding Kämmstelle and can, if necessary, make appropriate interventions, provided that the quality (including a missing sliver) moves from a predetermined tolerance field. Such an intervention may, for. B. include the shutdown of this Kämmstelle with a signal triggering.

The further suggestion that the press rollers are provided on their outer circumference with gear-like elevations that engage in the working position of the press rolls form-fitting, is allowed that only one of the press rolls must be driven by a drive means, while the second press roll on the gear-like elevations of the driven first press roll safely entrained, or is driven. Thus, it is also excluded that a slip occurs between the two press rolls, which could have a negative effect on the quality of the sliver.

For the gentle transport of the fiber material between the press rolls, it is proposed that the elevations have a rounded and sinusoidal shape.

Preferably, the driven roller of the pair of rollers may be a screen drum connected to a vacuum source, to which discontinuously fed fiber packets are removed from a combing and tear-off device to form a nonwoven fabric. With such a device z. B. the previously necessary Pilgerschrittbewegungen known combers are avoided as z. B. in the WO 2006/012758 A1 has been described.

In connection with the proposed use of a screen drum is further proposed that the combing and tear-off device consists of a nipper unit, which is associated with a combing cylinder, which is provided on its circumference with a combing segment and a tear-off segment, wherein the tear-off segment with a deliverable tear-off a Can form clamping point.

The comber can be equipped with more than eight juxtaposed Kämmstellen, z. B. with up to 32 Kämmstellen.

Further advantages of the invention will be shown and described in more detail in subsequent embodiments.

Fig. 1

eine schematische Seitenansicht eines Kämmkopfes einer Kämmmaschine mit der erfindungsgemäss beanspruchten Vlieszusammenfassung.

Fig. 2

eine Teilansicht X nach Fig. 1

Fig. 3

eine vergrösserte Ansicht Y nach Fig. 1 ohne Zangenaggregat

Fig. 4

eine vergrösserte Schnittdarstellung A-A nach Fig. 3

Fig. 4a

eine Teilansicht nach Fig. 4 mit einer weiteren Ausführungsform

Fig. 4b

eine vergrösserte Teilansicht des Kalanderwalzenpaares nach Fig. 4 mit einer Profilierung am Aussenumfang

Show it:

Fig. 1

a schematic side view of a combing head of a comber with the invention claimed nonwoven summary.

Fig. 2

a partial view X after Fig. 1

Fig. 3

an enlarged view Y after Fig. 1 without nipper unit

Fig. 4

an enlarged sectional view AA after Fig. 3

Fig. 4a

a partial view after Fig. 4 with a further embodiment

Fig. 4b

an enlarged partial view of the calender roll pair after Fig. 4 with a profiling on the outer circumference

Fig. 1 shows a schematic side view of a Kämmstelle, or a combing head of a comber, which was omitted for clarity reasons on the presentation of the pivot arms for the nipper unit Z, the brush roller for cleaning the combing cylinder 10 and the casing for the suction. However, this is well known and can be seen from many previous publications. As a rule, the combing machine has a large number of adjacent combing points. However, the embodiment is limited only to the representation of one of these Kämmstellen.

Instead of the shown pivotable attachment of the nipper unit would also be conceivable, the nipper unit (short "pliers" called) to arrange stationary, wherein to form the nip KS only the upper nipper knife 3 with respect to a fixed pliers plate 2 moves. However, this is not decisive for the proposed invention. In the present example, a reciprocating pliers Z (see double arrow) is assumed, wherein the drive for the oscillatory movement of a gear G is made, which is connected via the schematically illustrated drive path 8 with the pivot axis 4 of the frame R of the pliers Z. , Above a lower tong plate 2, a rotatably mounted feed roller 5 is arranged, which is connected to an intermittent drive, not shown, and for supplying a cotton W (or slivers) to the clamping point KS of the forceps. In the example shown, the pliers Z is in a rear position and is closed. The end of the wadding projecting beyond the clamping point KS (fiber tuft FB) is combed out through the clothing of a combing segment 11, which extends over a partial region of the circumference of a combing cylinder 10. The combing cylinder 10 is rotatably mounted in the machine frame MS via the axis 13 and is driven by the gear G via the drive path 14 shown schematically.

The drive of the transmission G is carried out by a schematically illustrated main motor M, which communicates with a control unit ST via the line 44 in connection.

On the opposite side of the combing segment 11, a tear-off segment 12 is mounted on the combing cylinder 10, which in conjunction with a displaceably mounted Abwalwalze 15 (see double arrow) performs the demolition of the combed fiber tuft FB, as will be described below.

Adjacent to the combing cylinder 10, a sieve drum 17 is arranged, which is rotatably supported via an axis 18 via the bearings 19 and 20 in the machine frame MS, such. B. from the Fig. 2 and the Fig. 3 can be seen. The drive of the screen drum 17 via a drive wheel A3 ( Fig. 3 ), which is non-rotatably mounted on the axle 18 and via a schematically illustrated drive path AE with the gear G is in driving connection (not shown).

Between the screen drum 17 and the combing cylinder 10, a, about a pivot axis 23 pivotable flap 22 is arranged, which has the task, depending on the position, the combed out components and the torn off fiber packets to conduct accordingly. This should be avoided in particular that ausgekämmtes material (noils, nits, dirt) enters the range of the drum 17. A detailed description of the function of this flap is z. In the published WO 2008/011733 A1 refer to.

Likewise, this publication is to be taken from a corresponding embodiment of a screen drum, wherein within the screen drum still another, rotatably mounted cylinder is provided with openings in order to control the air flows during the tearing off and soldering process.

In the present embodiment, however, only a simple screen drum 17 is shown, in the interior of which a stationary cover element 28 is arranged, which seals off the region of the screen drum, in which the fiber web V formed on the screen drum 17 is removed from the screen drum. The interior of the screen drum 17 is connected via the line 26 to a vacuum source 25, via which a negative pressure is generated within the screen drum.

Axially parallel to the screen drum 17, a pressure roller 30 is rotatably mounted, which z. B. rests on its own weight on the circumference of the sieve drum. In this case, the pressure roller may be mounted in corresponding guides in the machine frame MS in the direction of the circumferential surface of the screen drum. Likewise, a solution is conceivable, wherein the bearing of the pressure roller is mounted in pivot arms whose pivot axes are axially parallel to the axis of the screen drum 17 and stored in the machine frame MS. The pressure roller 30, together with the screen drum 17, forms a nip 31 for the fiber web V guided between the screen drum and the pressure roller. The nip 31 extends over the width B of the fiber web V guided on the outer circumference U of the screen drum 17.

The pressure roller can, for. B. be provided on its outer circumference with a rubber coating and is placed on the driven screen drum 17 and the web V via friction in rotational movement.

As seen in the conveying direction F, a guide element 31 is attached downstream of the clamping point 31, via which the fiber fleece V (called "fleece" for short) is brought together laterally and delivered to a fleece funnel 39 ("hopper" for short). In this case, the sheet-like web V is combined to form a sliver F1, which for further compression following the funnel 39 through the nip KK of a press roller pair K is passed through ( Figure 4 ). The press roll pair will be referred to in the following description as "calender roll pair K" with the calender rolls K1 and K2.

The guide element 31 has a lower guide surface 37, which extends over a partial region of the circumference U of the sieve drum 17 and, as in the sectional view AA (FIG. Fig. 3 ) in Fig. 4 is shown, the shape of the circumference of the screen drum 17 is adjusted. Between the circumference U of the screen drum 17 and the guide surface 37 is only a small distance, which only ensures that the guide member 31 does not drag on the circumference U of the screen drum. The guide element 37 is fixedly connected to the machine frame MS via fastening elements, not shown, and is thus held in a fixed position relative to the circumferential surface U of the screening drum 17.

For lateral guidance of the web V during the merger to the hopper 39, the guide member 33 is provided with side guides 34 and 35, which are connected to the lower guide surface 37 and extend from the latter - with respect to the axis 18 of the screening drum 17 - to the outside , These side guides 34, 35 could also be arc-shaped, as seen in cross-section, in order to support the "curling-in" of the fleece edges as far as the transfer to the hopper.

The side guide 34, on which the web V first hits after leaving the nip 31, is provided with an arc R1, which merges into a straight portion 36 which extends under a sloping winding α to the hopper 39.

The opposite side guide 35 has first a straight portion 38 which has at an angle β with respect to the axis 18 of the screen drum 17, which opens into an arcuate portion R2, via which the second web edge is fed to the hopper 39. Also, the cross section of the side guide 35 may be arcuate.

In the present example, the funnel 39, the guide surface 37 and the side guides 34, 35 made of one piece, which z. B. can be made of a plastic injection molded part. The hopper 39 is provided with downwardly extending side guides 41, 42, which the lateral guidance of the im Take funnel 39 combined fiber fleece up to the nip KK a subsequent Kalanderwalzenpaares K.

In the schematic view of Fig. 4a becomes a subsection of Fig. 4 shown, wherein the guide surface 37 'for the web V is not as in Fig. 4 the outer shape of the circumference of the screen cylinder 17 is adapted, but extends at an angle δ to the tangent Tg of the screen drum 17 and opens into the hopper 39.

Also such a, in Fig. 4a shown course of the guide surface 37 'of the guide means 33 is in the claimed term "in the region of the peripheral surface (U) of the driven roller (17) extending, stationary guide means" included.

As claimed according to the invention and in the example of Fig. 3 is shown, one of the calender rolls K1 of Kalanderwalzenpaares K rotatably and coaxially mounted on the screen drum 17 and is located outside the area in which the web V extends with the width B in the feed to the nip 31.

The second calender roll K2 is rotatably mounted via the bearing L1 in a pivot arm 49, which is mounted pivotably about a pivot axis 51 on the machine frame MS.

The pivot arm 49 and thus the calender roll K2 is loaded in the direction of the calender roll K1 by a spring 50, which is supported on the machine frame MS. As a result, a pressure is exerted on the fiber material located in the nip KK of the calender rolls K1, K2 and this is further compressed in order to increase the adhesive force. Instead of the spring 50 shown here z. B. also a bellows cylinder can be used.

The pivoting movement of the calender roll K2 in the direction of the calender roll K1 can be limited by attaching corresponding end stops (not shown) in order to prevent complete seating of the calender roll K2 on the calender roll K1.

The movement of the swivel arm 49 is monitored by a sensor 47 fixedly attached to the machine frame MS, the signals of which are transmitted via the line 48 to the central control unit ST. In the control unit ST, these signals are evaluated on the basis of existing programs. By scanning the Pivoting movement of the pivoting lever 49, the movement of the calender roller K2 is scanned, which is caused by the mass fluctuations of the guided through the nip KK fiber material. Thus, the mass profile in the form of a CV value can be determined and displayed. The representation can z. B. on a display AZ (eg., A screen), which is connected to the control unit ST. As soon as the determined CV value moves outside predetermined tolerance limits, an additional warning light can be triggered via the control unit ST and the corresponding combing point can be stopped.

The calender roll K2 is driven by a drive wheel A2, which is in drive connection with the drive wheel A1 via a belt ZR (eg toothed belt). The belt ZR is tensioned by tensioners, not shown, to compensate for the movements between the axes of the calender rolls K1, K2. Also conceivable is the use of gear drives.

The drive wheel A2 is rotatably mounted on the axis 29, which is fixedly connected to the calender roll K2. The axis 29 is, as schematically indicated, stored in the bearing point L1, which is located in the pivot arm 49.

The drive wheel A1 is mounted on the axis 18 of the screen drum 17, which at the same time also represents the drive axis of the calender roll K1, since the calender roll is connected coaxially and fixedly to the screen drum 17.

Thus, an additional axis for the calender roll K1 is saved and ensures an absolute synchronization between the screen drum 17 and the calender roll K1. The axis 18 of the screening drum 17 is rotatably supported by the bearings 19, 20 in the machine frame MS. Furthermore, a further drive wheel A3 is rotatably mounted on the axis 18, which is connected via a schematically illustrated drive element AE with the gear G in drive connection.

A further embodiment is also possible, wherein the calender roll K2 is not actively driven directly (as shown) via the belt transmission A1, A2 and ZR by the driven axle 18, but via friction under the action of the spring load (50) from the driven calender roller K1 is set in rotary motion.

In the enlarged view of Fig. 4b a further variant for the drive of the calender roll K2 is shown. The calender rolls K1 and K2 are on their Outer circumference with a sinusoidal profiling 54, and 55, respectively, which mesh in the operating position shown, in the region of the implementation of the fiber material, a gear like. About this positive engagement of the two profiles 54, 55, the freely rotatable about the axis 18 rotatably mounted calender roll K2 is driven by the calender roll K1, which is in driving connection with the gear G. Ie. In this embodiment, no special drive elements for the calender roll K2 are necessary, as in the embodiment of the Fig. 3 will be shown. By the action of the profiling on the performed fiber material, the adhesive force of the output from the Kalanderwalzenpaar K sliver F1 is also still increased.

• In der in Fig. 1 gezeigten Stellung ist die Zange Z geschlossen und befindet sich in einer hinteren Stellung. Der aus der Klemmstelle KS der Zange Z herausragende Faserbart FB wird durch das im Eingriff befindliche Kammsegment 11 des Kämmzylinders 10 ausgekämmt. Die Klappe 22 befindet sich nahe des Umfanges U der nachfolgenden Siebtrommel 17, so dass die ausgekämmten Bestandteile (Kämmlinge) nach unten in einem nicht gezeigten Absaugkanal abgeführt werden. Nach dem Kämmvorgang bewegt sich die Zange Z in eine vordere Stelle und befindet sich jetzt in geringerem Abstand zur Abreisswalze 15, welche inzwischen in Richtung der Achse 13 des Kämmzylinders 10 bewegt wurde und mit dem Abreisssegment 12 eine Klemmstelle bildet.

The function of the device shown is described in more detail below:

• In the in Fig. 1 shown position, the pliers Z is closed and is in a rear position. The fiber beard FB protruding from the clamping point KS of the pliers Z is combed out by the comb segment 11 of the combing cylinder 10 in engagement. The flap 22 is located near the circumference U of the following screening drum 17, so that the combed out components (noils) are discharged downwards in a suction channel, not shown. After the combing operation, the pliers Z moves in a front position and is now at a shorter distance to the tear roller 15, which has meanwhile been moved in the direction of the axis 13 of the combing cylinder 10 and forms a nip with the tear-off segment 12.

The tear-off segment 12 was moved by the rotational movement of the combing cylinder 10 during the forward movement of the pliers Z in the area below the tear-off roller 15.

The end of the combed tuft FB, which now protrudes from the open forceps Z, is detected by the nip between the tear-off segment 12 and the overlying tear-off roller 15, whereby the fibers thereby detected are pulled out of the end of the tuft FB, or "torn off" , The resulting in this tearing off fiber package is placed under the influence of the applied to the drum 17 vacuum on the end of the already resting on the circumference U of the drum 17 fleece V and in coverage (soldering) brought. However, before the transfer of this broken fiber packet to the screen drum 17, the flap 22 has been moved about the pivot axis 23 in the direction of the combing cylinder 10 to assist the transfer. A detailed description of this process can, for. B. from the WO 2008/011733 A1 be removed. The area of the transfer, as well as the area above the sieve drum 17, can be provided with corresponding casings (not shown) in order to be able to precisely control the air flows which are necessary for the transfer and the soldering process.

The screen drum 17 is driven at a constant speed and moves the web V on its circumference U to the nip 31 between the pressure roller 30 and the screen drum 17. After leaving the nip 31, the web V reaches the lower guide surface 37 of the guide member 33 and hits on the side guide 34, on which it is transferred under the action of the sheet R1 by the oblique arrangement (angle α) of the straight portion 36 to the hopper 39. The arranged on the opposite side further side guide 35 with its straight portion 38 (angle β) and the arc R2 supports the transfer of the opposite web edge to the hopper 39. The transferred to the hopper 39 fleece is thereby summarized and compacted and is the hopper to the nip KK of a subsequent and driven Kalanderwalzenpaar K (K1, K2) transferred. This transfer is supported by the existing side guides 41, 42, which are attached to the hopper 39. Thus, a lateral deflection of the fiber material is prevented before it enters the terminal point KK, where it is further compressed. As already described, the mass fluctuations of the fiber material guided through the clamping point KK can be detected and monitored by the pivotably mounted calender roller K2 by scanning the pivoting movement via the sensor 47.

The fiber sliver F1 delivered by the calender rolls K1, K2 downwards in the conveying direction FX reaches a conveyor table T, via which it is transferred to a subsequent drafting unit in the conveying direction FT with further slivers F2 to F6, which were produced and delivered at adjacent combing points. Subsequent to the drafting unit, a tape storage can be provided to deposit the sliver formed on the drafting unit in a pot.

The table T can also be powered by a conveyor, z. B. consist of a conveyor belt. The number of transported on the conveyor table slivers F1 to F6 is only to be understood as an example. It can also be a much larger number of combs (more than 12) arranged next to each other, which also a larger number of slivers is fed to the following drafting. Also, a number of up to 48 adjacent Kämmstellen is possible.

With the proposed device to obtain a compact and simple solution, with additional bearings and drive axles are avoided and the risk of incorrect distortion is minimized. The device proposed according to the invention is particularly advantageous for a combing machine with a large number (> 10) of adjacent combing points, in which the width of the nonwoven to be grasped is lower than is the case with conventional combing machines.

Claims (14)

1. A device for forming a sliver (F1) of a fiber fleece (V) formed at a combing location (1) of a combing machine, which is fed to a nip (31) of a pair of rollers (17, 30), which is composed of a roller (17) connected to a drive and a press roller (30) and - seen in the conveyor direction (F) - the fiber fleece following the nip (31) Is combined and fed via a funnel (39) to a pair of press rollers (K) connected to a drive (G, M), characterized in that the fiber fleece (V) - seen in the conveyor direction (F) - following the nip (31) of the pair of rollers (17, 30) is transferred in the region of the circumferential surface (U) of the driven roller (17) to the funnel (39) and the following pair of press rollers (K), and one of the press rollers (K1) of the pair of press rollers (K) is arranged on the driven roller (17) in a rotationally fixed and coaxial manner.
2. The device according to claim 1, characterized in that at least one stationary guide means (33) running in the region of the circumferential surface (U) of the driven roller (17) is arranged for the fiber fleece (V) between the nip (31) of the pair of rollers (17, 30) and the funnel.
3. The device according to claim 2, characterized in that the guide means (33) has at least one lateral guide (34), which projects Into the conveyor path of the fiber fleece (V) and which extends at an acute angle (α) to the rotation axis (18) of the driven roller (17) up to the funnel (39).
4. The device according to claim 3, characterized in that the guide means (33) Is provided with a lower guide surface (37) which runs in the region of the circumferential surface (U) of the driven roller (17) and supports the fiber fleece (V) on its underside during the transfer to the funnel (39).
5. The device according to one of claims 2 through 4, characterized in that the funnel (39) and the guide means (33) are connected to one another.
6. The device according to claim 5, characterized in that the funnel (39) and the guide means (33) are embodied as a one-piece molded article.
7. The device according to one of claims 1 through 6, characterized in that the press roller (K1) attached to the roller (17) is attached to one end of the roller (17), which is located outside the region of the nip (31).
8. The device according to one of claims 1 through 6, characterized in that the pivot mounted press roller (K2), which with the press roller (K1) attached to the roller (17) forms the pair of press rollers (K), is supported in a moveable manner transversely to its rotational axis (18) and is acted on via a spring element (50) in the direction of the press roller (K1) attached to the roller (17).
9. The device according to claim 8, characterized in that at least one sensor (47) Is provided, which scans the movement of the moveably supported press roller (K2).
10. The device according to claim 9, characterized in that a control unit (ST) is provided, in order to evaluate the signal emitted by the sensor (47) to the control unit to determine mass nonuniformity (CV value).
11. The device according to one of claims 8 through 10, characterized in that the press rollers (K1, K2) are provided on their outer circumference with gearwheellike elevations which engage in one another in a positive manner in the operating position of the press rollers.
12. The device according to claim 11, characterized in that the elevations have a rounded and sinusoidal shape.
13. The device according to one of claims 1 through 4, characterized in that the driven roller (17) of the pair of rollers (17, 30) is a screening drum (17) connected to a vacuum source (25), to which, in order to form a fiber fleece (V), combed out fiber packets are fed in a batch method from a combing and detaching device (Z, 10, 15).
14. The device according to claim 13, characterized in that the combing and detaching device (Z, 10, 15) is composed of a nipper unit (Z), to which a combing cylinder (10) is assigned, which is provided on its circumference with a combing segment (11) and a detaching segment (12), wherein the detaching segment (12) can form a nip with an adjustable detaching roller (15).

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