EP1577429B1 - Method and device for laying fibre tows of filaments - Google Patents

Description

The invention relates to a method and apparatus for laying fiber slivers of filaments by means of irresistibly movable weft or Diagonalleger to fiber webs, which are stretched between two equipped with guide hooks and retaining pins transport in different directions and thus fed to a pre-consolidation station, wherein the endless, flat slivers individually spread, guided by means perpendicular to the predetermined laying direction aligned guide elements of the weft or diagonal laying transverse over both transport chains and wherein each of the slivers whose guide element traversing the series of guide hooks of the transport chain is formed, in each case a turn fold, which forms a lower run , an upper run and a vertex and is mounted in retaining elements.

A method of the type mentioned was by the DE 101 49 161 C2 proposed. The group of slivers is guided diagonally across the transport chains with the aid of a weft or diagonal slitter. The guide elements for the slivers are aligned perpendicular to the direction of movement of the weft layer and arranged in a line next to each other parallel to the transport chains. The transport chains have two spaced rows of hooks. Adjacent to the scrim are the guide hooks. They have closely adjacent vertical needles with upwardly directed tip. Outside this row of guide hooks is another row of up and outward return needles. These are also arranged in high density.

The guide elements on the weft or Diagonalleger are vertically immovable. In the turning phase, a so-called. Wrinkle tensioner is introduced behind the guide element of the weft inserter, which guides the upper and lower strands of the turn fold separately at the vertex thereof until both strands are returned to the series of guide hooks after the offset of the upper step by means of the offset rake become. During the execution of the offset, the fibers of the turning fold are tensioned and collected by a so-called loop tensioner and transferred to the row of retaining hooks in the form of a strand.

This procedure requires a very high control effort because of the large number of tools involved in the process. The desired effect, namely to achieve a really gap-free design of the scrim, is achieved only with restrictions. The working speed remains limited and is unsatisfactory. In a change in the width of the slivers or in the change in the orientation of the sliver between the transport chains work elements must always be constructively adapted to the new conditions. The effort is high.

With the DE 197 42 721 C1 For example, a method and an apparatus for laying and setting up weft thread coulters have been known in which the transport chains are also equipped with guide hooks and needle-shaped retaining hooks. The weft threader lowers in conjunction with a pusher bar outside the retention hooks under the tips thereof after it has made a first offset. After completing another final offset below the tips of the retaining hooks, the weft leader lifts again and places the weft thread, now stretched between the retaining hook and the weft leader, at a predetermined location in the row of guide hooks of the transport chains.

However, with this procedure and this device, it is only possible to load weft thread groups whose weft threads are not laterally connected to each other reliably in the transport chains. For slivers from z. As carbon or glass filaments in which the filaments in a predetermined, defined position - namely forming a band - are held together by means of adhesive substances, this procedure is not suitable. During the offset, the cross sections of the sliver uncontrolled, so that a uniform hooking, especially the upper Trumes, can not be guaranteed in the series of guide hooks. In addition, during the displacement of a sliver within a guide element on the weft the band is formed into a strand. There is no way to spread this strand before handing it over to the guide hooks. In the margins of the jetty irregularly wide lanes, which are regarded as significant quality defects. This procedure is therefore not suitable for the laying of fiber ribbons of filaments.

The DE 100 21 341 A1 describes a similar device. Instead of the pusher bars, the gunner is assigned additional band fixations whose execution and mode of operation remain unclear. Obviously, these band fixations avoid skewing of the group of yarns during the offset behind the retention hooks. It is not possible with this arrangement to submit slivers of filaments. The pivoting of the guide elements carrying strips would always lead to strand formation. This makes it possible to produce no traffic-free scrim made of slivers.

By the DE 102 07 317 C1 a further device was known. The weft guide of the weft or diagonal layer aligned parallel to the row of guide hooks has guide elements whose guide surfaces are aligned parallel to the row of guide hooks. The weft yarn guide performs no movement in the offset direction. The offset is due to a standard offset rake made in a known manner associated with the outwardly and upwardly directed return needles.

Due to the movement of the offset rake - independently of the weft - a guided belt is deformed during the offset within the guide elements in the gun to a strand. This strand is finally inserted into the row of guide hooks and forms the dreaded lanes.

By the unpublished DE 103 12 534 was in training the first discussed DE 101 49 161 C2 a modified device proposed in which, inter alia, the transfer of the rope-shaped vertex of the turning fold should be improved by the folding clamp to the retaining hooks, that instead of the series of retaining hooks a kind of set (distributed on a surface return needles) is provided.

That too did not bring the desired success. The device and its control are similar consuming as it is in terms of DE 101 49 161 C2 was presented. Loose fibers from the sliver of the turning fold are partly also led into the scrim and so it comes there to unwanted distortions.

In a further variant of this document, which has not been previously published, the shooter with its guide elements is assigned subsequently activatable guide rakes which laterally fix the position of the slivers of the upper run of the turn fold and align them vertically in a plane parallel to the tips of the guide hooks. The function of the loop holder takes over here the folding clamp, which is pivotable about an axis. This passes his turning fold each a single retaining hook per sliver. This procedure is also unsatisfactory, since in particular when transferring the turning fold from the folding clamp on the individual retaining hooks, the turning fold is performed uncontrollably. The release of this fold by the folding clamp leads to Relaxing of fibers and slivers in the scrim.

In view of these seemingly unsolvable difficulties in hanging endless slivers of filaments into the hooks of the transport chains, attempts have been made to align previously cut slivers in a stretched form over the two transport chains and hook them into the rows of guide hooks of the transport chains. The free ends of the sliver sections were spent - directed downwards - in another clamp on the transport chain, which was reopened at each laying arrangement before new end sections are introduced. This way of working was also very difficult to control. The filaments of the slivers not directly connected to the clamping surfaces of the clamps could not be held securely and tightened. The interaction of the terminals with different functions is not manageable under industrial conditions at sufficiently high speed.

The object of the present invention is to propose a method and a device for laying endless fiber ribbons of filaments that control the distortions of the sliver in the turning fold with simple technical means such that both dreams are placed under defined conditions in the hooks of the transport chains can and the position and the tension of the inserted slivers between the transport chains are maintained.

This object is achieved by the method according to claim 1 in a surprisingly simple manner.

The first significant advantage of this solution is that the sliver sections of the yarn layer between the transport chains and the sliver sections in the area of the turn fold by the reliable fixation of the fibers of the slivers in guide hooks with narrow streets are separated from each other in terms of their voltage behavior. A temporary loosening of individual Fibers in the area of the turn fold do not automatically lead to a loosening of the fibers in the scrim.

The second major advantage of the new method is that in particular the upper run of the turn fold, after the vertices are inserted into the retaining hooks directly through the weft or Diagonalleger, can be stretched and guided by means of the simple Einreicherers so that an erection of this upper Trumes is avoided before hanging in the guide hook. Possibly. Excess fiber lengths are kept near the apex area of the turn fold. At the same time, the unilaterally displaced during the offset band cross sections are distributed in the region of the guide elements by the action of the Einstreichers again over the entire guide area, so that the upper run of the turn fold completely spread and stretched the guide hook can be presented.

The number of tools required for this process has been significantly reduced. Neither individually controllable folding clamps nor guide combs or loop holders are required. The scratches produced by this process are, as far as that is required, also targeted and reliable off-gas produced.

With the modification of the method according to claim 2 it is achieved that a single inserter can be used for a plurality of adjacent slivers fed with an uninterrupted Einreichkante. The training and control of the inserter simplifies considerably.

The design of the method according to claim 3 leads to a higher security in that the excess fiber portions are kept in the region of the turn fold away from the region of the upper trousers, which is presented to the guide hook for hanging.

The design of the guide hooks according to claim 4 allows the reliable separation between the tape sections in the scrim and the tape sections of the turn fold. A high degree of uniformity of the scrim is achieved in particular by tensioning and guiding the individual fiber slivers independently of each other in the yarn path in front of the guide elements and by matching the guide surfaces of these clamping and guide pins with the direction of the guide elements.

The device defined in claim 6 for carrying out said method is simple and straightforward and brings in relation to known devices essential simplifications in terms of tools and the necessary precision of the control movements.

The design of the double row of guide hooks and the series of retaining hooks according to claim 7 ensures particularly good clamping properties with simultaneous trouble-free insertion and removal of the slivers.

The embodiment of the weft and Diagonalleger according to claim 8 is used in particular the modification of the method according to claim 5.

The design of the gate according to claim 9 reduces the likelihood of random twisting of the belts in the yarn path between the spool and the weft or diagonal roller. Such distortions would lead to arbitrary irregularities in the clutch in the form of narrow lanes.

The use of the conveying or guide rollers or tension rollers in the inlet of the slivers according to claim 10 prevents the winding of individual filaments on these rollers and supports the spreading guiding the slivers.

Fig. 1

einen Querschnitt durch den Bereich einer Transportkette, in dem mittels Schussleger und Einstreicher eine Wendefalte ausgeformt wird,

Fig. 2

eine Draufsicht auf die in Fig. 1 gezeigte Vorrichtung, wobei die Ausbildung der Wendefalte anhand mehrerer Positionen eines Führungselementes des Schuss- oder Diagonallegers aufgezeigt wird,

Fig. 3

einen Querschnitt ähnlich der Fig. 1 in einer Position, in der die Führungselemente des Schusslegers das untere Trum der Wendefalte in die Reihe der Rückhaltehaken einhängen,

Fig. 4

eine Ansicht analog der Fig. 3 in einer Position, in der der Einstreicher zwischen die Führungselem ente des Schusslegers und die Rückhaltehaken eingeführt wird,

Fig. 5

einen Querschnitt nach Fig. 3, bei dem das zwischen dem Einstreicher und dem Führungselement des Schusslegers gespannte obere Trum der Wendefalte der Reihe der Führungshaken übergeben wird,

Fig. 6

eine Darstellung der Bandführungs- und -spannelemente am Schussleger mit einer polygonartig gestalteten Führungswalze,

Fig. 7

eine schematische Darstellung des Bandverlaufes zwischen der Spule und den Zuführwalzen,

Fig. 8

eine teilweise Draufsicht auf Fig. 7, die den Faserbandverlauf zwischen dem Ablaufpunkt der Spule und der ersten Führungsrolle zeigt, und

Fig. 9

eine polygonartig gestaltete Spannrolle des Bandspeichers.

The invention will be explained below using an exemplary embodiment. In the accompanying drawings show:

Fig. 1

a cross section through the region of a transport chain, in which a turning fold is formed by means of weft and inserter,

Fig. 2

a top view of the in Fig. 1 shown apparatus, wherein the formation of the turning fold is indicated by means of several positions of a guide element of the weft or diagonal layer,

Fig. 3

a cross section similar to the Fig. 1 in a position in which the guide elements of the shotgun hook the lower run of the turning fold in the row of retaining hooks,

Fig. 4

a view analogous to Fig. 3 in a position in which the inserter is inserted between the guide element of the weft inserter and the retention hooks,

Fig. 5

a cross section after Fig. 3 in which the upper run, stretched between the inserter and the guide element of the weft feeder, is handed over to the turn of the row of guide hooks,

Fig. 6

a representation of the band guide and clamping elements on the weft with a polygonal-shaped guide roller,

Fig. 7

a schematic representation of the strip path between the spool and the feed rollers,

Fig. 8

a partial top view Fig. 7 showing the sliver course between the discharge point of the spool and the first guide roller, and

Fig. 9

a polygonal designed tension roller of the tape storage.

The laying device, as used in particular for multiaxial filament loom, consists of two laterally of the laying arrangement movable transport chains 1. These transport chains 1 move usually uniformly in the direction of a processing point, which is usually the effective point of a stitchbonding machine. For each thread layer of Geleges a separate laying arrangement is provided, the shot or Diagonalleger 2 in different directions on the Movement path of the two transport chains 1 to move back and forth. On a representation of this overall arrangement is omitted. It belongs to the well-known state of the art.

The arrangement of the guide 13 and retaining elements 14 on the conveyor chain 1 is from the Fig. 1 seen. On a support plate 11, which is each connected to a chain link, there is a two-part frame 12. In the vertical part of this version 12 upwardly directed guide hooks 13 are arranged in the form of a double row. The guide hooks 13 are relatively narrow and have narrow streets in the direction of the two rows of needles. It is advantageous to place about 15 to 25 needles per inch. Well proven has been the arrangement of 20 needles per inch.

The shank cross section of the needles of the guide hooks is flattened vorteihafter way. The larger cross sections extend transversely to the direction of movement of the transport chains. 1

In the horizontal portion of the socket 12, the return needles 14 are attached. The return needles 14 are similarly densely arranged and designed as the needles of the guide hooks 13. However, these retaining hooks 14 are predominantly oriented horizontally. It would also be possible to use them inclined at an angle to the horizontal up or down. However, the horizontal orientation has proven to be particularly useful with regard to the preparation of the versions.

In the area of a laying arrangement, a weft thread guide arranged on the weft or diagonal ruler 2 is provided. The weft yarn guide here consists of a guide rail 21, in which the guide elements 22 are arranged. At least these guide elements 22 are movable in three directions. Namely once across or diagonally to the transport chains for the laying motion, then in the longitudinal direction of the transport chains for the execution of an offset and finally in the vertical direction for the defined hooking in the guide hooks 13 and in the return needles fourteenth

Between the level of the return needles 14 and a partially raised guide member 22, a former 3 is arranged horizontally movable from outside to inside. This inserter 3 is in the Figures 1 and 2 drawn with its Einreichkante 31 approximately in its foremost position.

The example of Fig. 2 the operation of the device in the individual phases by means of a guide element 22 / A to 22 / E will be described. Coming from the bottom left, the guide element 22 first traverses the row of guide hooks 13 of the transport chain 1. Behind this row of guide hooks 13, the guide elements 22 lower, so that the sliver F is fixed in a clamping manner in the row of guide hooks 13. If this process is completed, during the delay of the shotgun 2 already the offset V1 in the longitudinal direction of the transport chain 1. The guide elements 22 / A are still above the level of the return needles 14. If a part of the total offset - offset V1 - covered, the Guide bar 21 of the gun 2 lowered with their guide elements 22 down.

The pusher edge 211 and 212 of the guide bar 21 moves the sliver F down. It is spliced by the tips of the return needles 14 and fixed in the lanes between the return needles 14 (position 22 / B). After the execution of a further offset V2 in this lowermost position, the guide rail 21 is raised with its guide elements 22 / C again. The sliver is spliced again and placed in the lanes between the return needles 14. The movement of the weft layer 2 in the direction of the other transport chain 1 begins in this phase, so that the sections of the vertex of the turning fold FW now finally fixed between the lanes of the return needles 14 become.

Once a sufficient vertical space between the return needles 14 and the guide elements 22 is present, the inserter 3 is moved ahead with its Einreichkante, preferably by means of a control piston, not shown, in the direction of the guide needle row 13. In this movement of the applicator 3, the same assists in wiping the corner fold FWS of the turn fold into the lanes of the retention hooks 14. At the same time, the landing edge 31 holds the fibers of the upper run FWO against the socket 12 of the return needles 14. This creates a pull on the outer fibers the fiber sliver FWO exerted, by means of which during the offset in the guide elements 22 unilaterally displaced sliver F is compensated again.

This can be clearly seen in the position of the guide element 22 / D. At the same time, the insertion edge 31 secures in this position that the parts of the sliver remain taut between the guide element 22 and this clamping edge and free fiber parts accumulate outside the nip line. The upper run FWO of the turning fold FW is thereby spread and evenly stretched over the row of guide hooks 13 in the direction of the other transport chain 1 moves. This tensioned section FWO of the sliver F is aligned exactly horizontally and is thus presented to the guide hook 13 in a uniform height. A special lifting movement of the guide elements 22 is initially not intended for insertion into the row of guide hooks 13. The need will be determined by the skilled person from case to case, depending on the nature of the slivers F presented.

In Fig. 3 the position of the working elements is shown again. This illustrated position corresponds approximately to the position 22 / B of the guide element in the Fig. 2 , The first part of the offset V1 is completed and the guide elements 22 / B of the weft or diagonal layer 2 lower with the pusher edge 211 below the Row of retention pins 14. The liner 3 is still in the resting position.

Position 22 / C of Fig. 2 is in Fig. 4 shown. The guide rail 21 of the weft or diagonal layer 2 has already been raised again with its guide element 22 / C and is in the first phase of its movement to the row of guide hooks 13. The former 3 has almost reached its end position. It clamps portions of the upper run of the turn fold FW to the socket 12 of the return needles 14 and aligns the sliver of the upper run FWO horizontally.

The Fig. 5 shows a following position. The guide rail 21 of the weft or diagonal layer 2 has moved to a further lifting over the series of guide hooks 13 of the conveyor chain 1 and clamped by the holder 3 flat upper run of the turning fold FW so that the parts of the sliver F through the tips split the guide hook 13 and move the individual fiber strands in the streets between the guide hook 13 to the bottom of the same. There these bands are clamped. Possibly. Loose sections in the area of the turning fold FW do not shift into the area of the thread mesh between the transport chains 1.

Of particular importance is that the sliver F is always stretched between the inserter 3 and the guide member 22 on the gun 2. This regularly existing tension is supported by a known clamping arrangement of guide pins 14 and dowel pins 13 above the guide elements on the weft 2. In contrast to the known prior art, however, this guide and clamping arrangement is provided here individually for each sliver F. Such a guide and clamping arrangement is in Fig. 6 shown. The guide pins 24 and the clamping pin 23 are aligned parallel to the guide surface in the guide elements 22. The clamping pin 23 is in the horizontal direction elastically biased so that it can temporarily store excess sliver sections in the region of the turning fold FW while forming a small fold.

This parallel alignment of the guide elements also applies to the feed roller 4, which is located at a distance above the range of motion of the weft or diagonal layer 2 between the two transport chains 1. This regularly difficult to access feed roller 4 is designed as a so-called. Polygon roller or as a roller with longitudinal ribs, which are aligned along generatrices. This embodiment is intended to ensure that not individual from the association of the sliver F solving fibers wrap around this feed roller 4.

The scheme of feeding a sliver from the bobbin to the feed roller 4 is shown in FIG Fig. 7 shown. The guided on a horizontal axis in a gate coil 8 is slightly braked by means of brake 9. From the run-off point of the band is the same over a greater distance, which may be up to several meters, led to a broad, frangeless first guide roller 7 on which the sliver F depending on the respective expiration point on the spool 8 can shift laterally (see , Fig. 8 ). The upper run of this forming here loop of the band is then also performed over a long distance to a second guide roller or to a delivery 6. A strong lateral deflection of the sliver F is thus reliably prevented.

The delivery mechanism 6 has three driven delivery rollers, which pulls the slivers F at a constant speed of the coils 8. Belonging to a delivery mechanism 6 coils 8 are offset in the gate against each other along their axes such that position their slivers without lateral guidance at a reasonable distance laterally on the delivery rollers.

The different take-off speeds required by the laying process and the resulting temporary sliver excesses are buffered in the region of the band memory 5. To secure the spread position of the sliver also on the tensioning roller 51 provided with lateral collars, it has a polygonal running surface for the sliver F. This is formed here by individual annularly arranged pins (cf. Fig. 9 ).

This arrangement and design of the guide elements in the gate has proven itself. The number of spins in the band, which can happen by chance, has decreased significantly.

LIST OF REFERENCE NUMBERS

1

transport chain

11

support plate

12

version

13

Leadership hook, double row

14

Retention hook

15

supporting role

2

Shot or diagonal eager

21

guide rail

211, 212

presser edge

22 (A, B, C, D, E)

guide element

23

dowel pin

24

guide pins

3

once rich

31

Creaming edge

4

feed

5

tape storage

51

idler

6

delivery mechanism

7

leadership

8th

Kitchen sink

9

brake

A, B, C, D, E

Positions of a guide element in the turning phase

F

sliver

FG

Sliver crowd

FW

turning fold

FWU

lower strand

FWS

vertex

FWO

upper strand

V1

Offset (before hooking into the retaining hooks)

V2

Offset (after hanging in the retaining hooks)

Claims (10)

1. Method for laying fibre bands made of filaments

   - by means of reciprocating weft layers or diagonal layers (2)

   - to form fibre-laid fabrics

   - - which are stentered in different laying directions between two transport chains (1) equipped with guide hooks (13) and retainer needles (14) and are thus fed to a prebonding station,

   wherein the continuous, planar fibre bands (F) are laid transversely over the two transport chains (1) in an individually spread out manner by means of guide members (22) of the weft layer or diagonal layer (2) orientated at right angles to the predetermined laying direction, wherein each of the fibre bands (F) of which the guide member crosses over the row of guide hooks (13) of the transport chain (1) in the incoming direction is formed into a turning fold (FW) which comprises a lower strand (FWU), an upper strand (FWO) and an apex, wherein the beginning of the lower strands (FWU) and the end of the upper strands (FWO) of the turning folds (FW) are fixed by clamping in gaps between the guide hooks (13), wherein the apexes of the turning folds (FW)

   - form an offset (V1, V2) for the fibre bands (F) in the turning phase of the weft layer or diagonal layer (2) and

   - are hooked up in loops and fixed in a spread out manner side by side in a row of retainer needles (14), which are arranged close together and directed substantially horizontally outwards, by lowering and raising the guide members (22), and
   wherein the upper strands (FWO), forming between the retainer needles (14) and the guide members (22) of the weft layer or diagonal layer, of the turning folds of a group can be moved inwards from the outside directly above the retainer needles (14) transverse to the movement direction of the transport chains (1) by means of a stitch spreader (3) which is equipped with a spreading edge (31) orientated parallel to the movement direction of the transport chains (1), characterised in that
   the fibre band portions of the apexes (FWS) are fixed in the gaps between the retainer needles (14) by the stitch spreaders (3),
   in that the width of the fibre bands (F), which is reduced during the offsetting into the guide members (22), is increased again and
   in that the cross-section of the upper strands of the turning folds is guided parallel to the plane of the retainer needles (14) and the portions of the fibre bands (F) are substantially held inserted between the spreading edge (31) and the guide members (22).
2. Method according to claim 1, characterised in that the spreader edge (31) of the stitch spreader (3) is guided closely above the row of retainer needles (14) in a positive manner from below and in a resilient manner from above.
3. Method according to claim 2, characterised in that, during the movement of the guide members (22) from the outside over the row of guide hooks (14), the fibre bands (F) are braked on the transport chain (1) between the spreader edge (31) and a surface located at a distance in front of the row of guide hooks (13).
4. Method according to claim 1, characterised in that the beginning of the lower strand (FWU) and the end of the upper strand (FWO) of the turning fold (FW) are fixed in the gaps between the needles of two rows of guide hooks (13) immediately adjacent to one another.
5. Method according to claim 1, characterised in that each individual fibre band (F), independently of the other fibre bands of the group, is guided in the feed direction in front of the respective guide members (22) on the diagonal layer or weft layer (2) across the width of the fibre bands (F) under uniform tension and parallel to the respective guide member (22).
6. Apparatus for laying fibre bands made of filaments to form fibre-laid fabrics, comprising a pair of endless, moveable transport chains (1) equipped with rows of guide hooks (13) and with retainer needles (14), also outwardly orientated and arranged lower than the holders (12) of the guide hooks (13), for guiding and fixing turning folds (FW),
   one or more weft layers and/or diagonal layers (2) having guide members (22) which are orientated at right angles to the laying direction of the fibre bands (F) between the transport chains (1) and are used to guide continuous fibre bands,
   one creel per weft layer or diagonal layer (2), said creel having tangentially unwinding bobbins (8) for supplying groups of fibre bands (F),
   the transport chains (1) each being equipped with a double row of substantially vertical, needle-shaped guide hooks (13) and with a row of retainer needles (14), characterised in that,
   the retainer needles (14) are orientated substantially horizontally and are located with their holders below the base portions of the guide hooks (13),
   in that the rows of guide hooks (13) and the row of retainer needles (14) have a density of 15 to 30 needles per inch,
   in that at least one stitch spreader (3) guided and controlled outside the transport chain (1) is assigned to each weft layer and/or diagonal layer (2) per transport chain (1),
   in that each stitch spreader (3) is displaceably guided below the conventional movement region of the guide members (22) of the weft layer or diagonal layer (2) and transverse to the movement direction of the transport chains (1),
   in that each stitch spreader (3) is equipped with a spreader edge (31) orientated parallel to the transport chains (1),

   - which is movable from outside over the retainer needles (14) into the region of the holders (12) thereof and

   - which extends over the region of the turning folds (FW) of the fibre bands (F) guided by a weft layer or diagonal layer (2).
7. Apparatus according to claim 6, characterised in that the needles of the double row of guide hooks (13) and/or the retainer needles (14) have a flattened cross-section, the cross-section being arranged such that the larger extension is transverse to the movement direction of the transport chains (1).
8. Apparatus according to claim 6, characterised in that the weft layer or diagonal layer (2) has, for each of its guide members (22), separate guide pins (24) and/or dowel pins (23), the guide surfaces thereof being orientated parallel to the guide members (22).
9. Apparatus according to claim 6, characterised in that the creel assigned to each bobbin (8) has at least one flangeless return roller (7) which is arranged at a distance of at least four bobbin widths after the previous unwinding point.
10. Apparatus according to claim 6, characterised in that the conveyor or feed rollers (4) or the tension rollers (51) in the band store (5) have a polygonal cross-section in the inflow of the fibre bands (F).

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