EP1947223A1 - Device for the guided transport of a web - Google Patents

Abstract

A rotating drive drum assembly (51a- i) maintains a feed of a tufted web (69) with which it is in contact. The assembly has a number of guides (72a- i) with a series of side-by-side curved tongues (73a- i) in-line with the direction of travel. The tongues have a lower coefficient of friction than drum (51a- i). The contact force of each individual tongue exerted on the drum is adjustable.

Description

Field of the invention

The invention relates to a device for guided transport of a card web.

Description of the Prior Art

The transport of card webs for nonwoven production takes place starting from the carding machine in which the card webs are produced from material fibers, up to the web laying machine, in which the card web is laid into a thicker nonwoven with several pile layers. On the entire transport path of the card web from the card to the storage of the card web in the crosslapper, the problem arises that the conveyor belts for the card web due to the high speeds entrain entraining entail the deflection of the card web around guide rollers or when merging two conveyor belts to one Blistering leads. This air escapes laterally and leads to fluttering of the bands as well as Florverblasungen, Florrissen, strains or widening of the pile, so in general to an inhomogeneity of the pile. In the deflection of the card web around guide rollers, the centrifugal forces that occur additionally lead to a lengthening of the nap, which also brings with it the risk of sacking or wrinkling.

Even on a straight line, at very high speeds, such as speeds in excess of 150 m / min, the web may come off the belt, which can also cause wrinkles and blow-ups. In the production of spunbonded nonwovens, speeds of the sieve belt, on which the filaments are deposited, of up to 600 m / min may sometimes be required for their removal. It is known to hold the filaments on the screen belt by a suction flow, see " Nonwovens "by W. Albrecht et al., Verlag Wiley-VCH, Weinheim, 2000, pages 191-199 However, in view of the high transport speeds alone, the above-mentioned difficulties can not be ruled out. Even at Florstreckwerken entrained trailing air is problematic and affects the function of the drafting system.

Overview of the invention

It is therefore the object of the present invention to provide a device for guided transport of a card web, with which a stable transport of the card web is ensured even at high speeds and caused by drag air, wrinkling or centrifugal forces inhomogeneities in the card web are avoided.

This object is solved by the features of claim 1.

According to the invention, the device for the guided transport of a card web comprises a card web transport means for advancing the card web, which has a circumferential outer surface, wherein at any time a part of the peripheral outer surface forms a contact surface for making a frictional connection with at least parts of the card web to be transported. In addition, the device comprises a card web guide means having a plurality of spaced apart, curved tongues, which are arranged opposite to at least a part of the contact surface of the Florkahnantriebmittels, extending in the direction of movement of the card web and thus form a guide surface for guiding flat of the card web, the guide surface has a lower coefficient of friction than the contact surface of the card web transport means, and wherein each tongue is individually movable against a force in a direction away from the contact surface of the card web transport means.

This ensures that even at high speeds of the card web the disadvantages mentioned above are avoided.

Advantageously, the tongues are polished or coated with polytetrafluoroethylene in order to keep the coefficient of friction as low as possible.

The tongues are designed for example as elastic spring plates, which makes the arrangement cost.

In another embodiment, the tongues may be rigid discs that are movable against a spring force. It can be assigned to different rigid discs in a particularly simple manner different spring forces.

In terms of the simplest possible bias generation, the tongues can be biased in the direction of the contact surface of the card web transport means by means of springs or weights or pneumatically.

Different applications require different bias voltages. Therefore, it is advantageous that means are provided with which the bias of the tongues is adjustable.

Different pile thicknesses can be accommodated by means with which the distance between the tongues and the contact surface of the card web transport means can be adjusted.

If the adhesion forces between the card web and the pile transport means for a safe entrainment of the card web is insufficient, the surface roughness of the card web transport means must be sufficiently high that sets between it and the card web a sufficiently large coefficient of friction, with the result that the card web on the Florbahntransportmittel not slipping and is taken from him safely. For this purpose, the surface of the card web transport means may optionally be structured. For example, its surface may be diced. Too much sticking, such as entanglement of fibers of the fiber web on Florbahntransportmittel such that when loosening the card web from Florbahntransportmittel fibers remain on the surface of Florbahntransportmittels, but may not take place.

In one embodiment, the card web transporting means is a transport belt running around a plurality of guide rollers, whose peripheral outer surface forms the contact surface, wherein the part of the contact surface, which is opposite to the card web guide means at all times, is always in the circulation area around a card web deflection roller. In this way it is possible to redirect a card web while diverting entrained air and avoiding negative effects of centrifugal force in another direction.

A suitable device for the transition between superstructure and carriage of a designed as Flachtäflers fleece layer is obtained when the conveyor belt is guided at an acute angle to the Florbahnumlenkwalze. Subsequently, the conveyor belt runs substantially horizontally, starting from the card web deflection roller, and a second conveyor belt runs below at a small distance parallel to the first conveyor belt. The guiding property of the device is thereby optimized by virtue of the fact that the curvature of the tongues corresponds to the shape of a peripheral section of the card web deflection roller.

In addition, a means for discharging entrained by the second conveyor belt drag may be arranged above the second conveyor belt in the region of an inlet gusset between the two conveyor belts, whereby wrinkling in the storage of the card web on the second conveyor belt can be almost completely avoided.

This means for discharging the entrained air entrained by the second conveyor belt preferably has an end region which extends obliquely from above to the second conveyor belt and has air passage openings.

In a particular embodiment, the card web guide means and the means for discharging the entrained air entrained by the second conveyor belt are formed as a continuous element. This reduces the total number of machine parts and lowers the cost of manufacturing and assembly.

In another embodiment, the card web transporting means is a card web deflection roller which is arranged in the transition region between a first conveyor belt arriving at an angle from above and a second, horizontally running lower transport belt. As a result, a transfer of the card web from an obliquely downwardly extending conveyor belt to a horizontal conveyor belt can take place in a simple manner while avoiding the formation of wrinkles.

In this case, the curvature of the tongues preferably corresponds to the shape of a peripheral section of the card web deflection roller.

In yet another embodiment, the card web transporting means is a conveyor belt running around a plurality of guide rollers, the peripheral outer surface of which forms the contact surface, wherein the part of the contact surface opposite the card web guiding means at any given time runs in a straight line. With this configuration, extremely high transport speeds can be achieved.

The tongues are preferably curved in the direction of transport of the conveyor belt, and an end portion of the tongues is biased against the conveyor belt. By this arrangement, the movement of the conveyor belt is opposed only a very low resistance.

In a further embodiment, two conveyor belts are arranged to a belt transition, that a guide roller of the first conveyor belt and a guide roller of the second conveyor belt are axially parallel to each other, wherein each of the two guide rollers in the same direction with independently adjustable speed is rotatable, and two Florkahnführungsmittel are provided, each of which is arranged over one of the two guide rollers, so that a drafting system is formed for stretching the card web. This embodiment provides a particularly simple drafting system in which the entrained air entrained by the conveyor belt is removed in a simple manner and thus wrinkling is avoided.

In another embodiment, two conveyor belts are arranged to form a belt transition, that a guide roller of the first conveyor belt and a guide roller of the second conveyor belt are axially parallel to each other, wherein each of the two rollers in the same direction with independently adjustable speed is rotatable, and the end of the Tongues of the single card web guide means extends over both guide rollers and is biased above both guide rollers against both conveyor belts, so that a drafting system for stretching the card web is formed. This drafting system has the advantage that it has even fewer individual elements.

The invention will be explained in more detail with reference to embodiments shown in the drawings.

Brief description of the drawings

• Fig. 1 eine schematische Querschnittsansicht eines Vlieslegers mit einer ersten Ausführungsform der erfindungsgemäßen Vorrichtung zum geführten Transport einer Florbahn;
• Fig. 2 eine vergrößerte Ansicht der Vorrichtung zum geführten Transport einer Florbahn gemäß Ausschnitt x aus Fig. 1;
• Fig. 3 eine vergrößerte schematische Querschnittsansicht der ersten Ausführungsform der erfindungsgemäßen Vorrichtung zum geführten Transport einer Florbahn mit verschiedenen Stellungen des Florbahnführungsmittels;
• Fig. 4 eine schematische Querschnittsansicht einer zweiten Ausführungsform der erfindungsgemäßen Vorrichtung zum geführten Transport einer Florbahn mit verschiedenen Stellungen des Florbahnführungsmittels;
• Fig. 5 eine schematische Querschnittsansicht eines Vlieslegers mit einer dritten Ausführungsform der erfindungsgemäßen Vorrichtung zum geführten Transport einer Florbahn;
• Fig. 6 eine vergrößerte Ansicht der Vorrichtung zum geführten Transport einer Florbahn gemäß Ausschnitt x aus Fig. 5;
• Fig. 7 eine schematische Querschnittsansicht eines Vlieslegers mit einer vierten Ausführungsform der erfindungsgemäßen Vorrichtung zum geführten Transport einer Florbahn;
• Fig. 8 eine vergrößerte Ansicht der Vorrichtung zum geführten Transport einer Florbahn gemäß Ausschnitt x aus Fig. 7;
• Fig. 9a bis 9e verschiedene schematische Querschnittsansichten von Übergängen zwischen zwei Transportbändern mit einer fünften Ausführungsform der erfindungsgemäßen Vorrichtung zum geführten Transport einer Florbahn;
• Fig. 10 eine schematische Ansicht der Anwendung der Erfindung beim Florbahneinlauf eines Kalanders oder eines Streckeigenschaften aufweisenden Vlieslegers;
• Fig. 11 eine schematische Querschnittsansicht eines horizontal geführten Transportbandes mit einer sechsten Ausführungsform der erfindungsgemäßen Vorrichtung zum geführten Transport einer Florbahn;
• Fig. 12 eine schematische Querschnittsansicht eines Florstreckwerks mit einer siebten Ausführungsform der erfindungsgemäßen Vorrichtung zum geführten Transport einer Florbahn;
• Fig. 13 eine schematische Querschnittsansicht eines Florstreckwerks mit einer achten Ausführungsform der erfindungsgemäßen Vorrichtung zum geführten Transport einer Florbahn; und
• Fig. 14 eine schematische Querschnittsansicht eines Florstreckwerks mit einer neunten Ausführungsform der erfindungsgemäßen Vorrichtung zum geführten Transport einer Florbahn.

It shows:

• Fig. 1 a schematic cross-sectional view of a nonwoven fabric with a first embodiment of the device according to the invention for the guided transport of a card web;
• Fig. 2 an enlarged view of the device for guided transport of a card web according to section x Fig. 1 ;
• Fig. 3 an enlarged schematic cross-sectional view of the first embodiment of the device according to the invention for the guided transport of a card web with different positions of the card web guiding means;
• Fig. 4 a schematic cross-sectional view of a second embodiment of the device according to the invention for the guided transport of a card web with different positions of the card web guiding means;
• Fig. 5 a schematic cross-sectional view of a nonwoven fabric with a third embodiment of the device according to the invention for the guided transport of a card web;
• Fig. 6 an enlarged view of the device for guided transport of a card web according to section x Fig. 5 ;
• Fig. 7 a schematic cross-sectional view of a nonwoven fabric with a fourth embodiment of the device according to the invention for the guided transport of a card web;
• Fig. 8 an enlarged view of the device for guided transport of a card web according to section x Fig. 7 ;
• Fig. 9a to 9e various schematic cross-sectional views of transitions between two conveyor belts with a fifth embodiment of the device according to the invention for the guided transport of a card web;
• Fig. 10 a schematic view of the application of the invention at Flahnenahneinlauf a calender or stretched nonwoven fabric;
• Fig. 11 a schematic cross-sectional view of a horizontally guided conveyor belt with a sixth embodiment of the device according to the invention for the guided transport of a card web;
• Fig. 12 a schematic cross-sectional view of a Florstreckwerks with a seventh embodiment the device according to the invention for the guided transport of a card web;
• Fig. 13 a schematic cross-sectional view of a Florstreckwerks with an eighth embodiment of the device according to the invention for the guided transport of a card web; and
• Fig. 14 a schematic cross-sectional view of a Florstreckwerks with a ninth embodiment of the device according to the invention for the guided transport of a card web.

In the drawings, only the parts essential to the explanation of the invention are shown in order not to overload the drawings with superfluous details

Detailed description of the invention

A first field of application of the device according to the invention for the guided transport of a card web lies in the guidance of a card web around a deflecting roller, so that the card web subsequently comes to rest with the top side downwards. This variant is mainly used in trained as Flachtäflern fleece layers application.

Fig. 1 shows a schematic cross-sectional view of such a nonwoven layer with a first embodiment of the device according to the invention for the guided transport of a card web.

The nonwoven layer comprises a delivery conveyor belt 3, which is intended to transport a laid nonwoven in a direction of transport perpendicular to the plane of the drawing. From guide devices of the delivery conveyor belt 3, an upper guide roller 5 is shown in phantom. About the delivery conveyor belt 3 is a laying carriage 7 on rails (not shown) transversely to the transport direction of the delivery conveyor belt 3 back and forth movable. In the carriage 7, two guide rollers 9 and 11 are freely rotatably mounted. The first guide roller 9 is partially wrapped by a first cover strip 13, which has a portion which extends at a close distance above the discharge conveyor belt 3 to a driven guide roller 15 and from there via a further stationary guide roller 17 to a guide roller 19, in a first tensioning carriage 21 is rotatably mounted, below the delivery conveyor belt 3 transversely to this on rails (not shown) is movable. Of the mounted in the tensioning carriage 21 guide roller 19, said cover strip 13 extends over two further stationary guide rollers 23 and 25 back to the laying carriage 7. The driven guide roller 15 is coupled to a motor (not shown) and is intended to the first cover strip 13 in to power different directions.

Since the upper run of the second cover 29 also serve to transport a card web (not shown) in the forming gap formed between the guide rollers 9 and 11 on the laying carriage 7, the second cover 29 may also be referred to as a laying tape.

Similarly, the other guide roller 11 which is rotatably mounted in the laying carriage 21, partially wrapped by a second cover 29, which is guided via a driven guide roller 31 and a stationary guide roller 33 to a mounted in the tensioning carriage 21 second guide roller 27, of the Masking tape 29 is partly entwined, from where the cover strip 29 runs back over further stationary guide rollers 35 and 37 to the laying carriage 7. The second cover strip 29 thus has a portion which runs at a close distance above the delivery conveyor belt 3. The driven deflection roller 31 is also coupled to a motor (not shown) and is intended to drive the second cover band 29 in different directions.

On the laying carriage 7, a chain or a toothed belt 39 is mounted, which runs over a drive gear 41 and a deflection wheel 43 connected to a motor (not shown). With the aid of these drive devices, the laying carriage 7 can be moved back and forth across the delivery conveyor belt 3 transversely to its transport direction.

In a relation to the height level of the laying carriage 7 elevated position in the machine frame a dashed line shown superstructure 45 transversely to the transport direction of the delivery conveyor belt 3 on rails (not shown) movably mounted. The uppercarriage 45 has an upper deflecting roller 47 and a lower Florbahnumlenkwalze 49, which are offset in the direction of movement of the upper carriage 45 against each other. About these two rollers 47 and 49 runs a conveyor belt 51 a for the card web, which is also referred to as the first conveyor belt. In the area bounded by the two guide rollers 47 and 49 in the uppercarriage 45, the first conveyor belt 51a slopes obliquely downward. From the lower Florbahnumlenkwalze 49 in the uppercarriage 45 runs starting the first conveyor belt 51a parallel to the upper strands of the two cover strips 13 and 29. Since the first conveyor belt 51a together with a portion of the upper run of the second cover strip 29, the card web, it may also be referred to as a laying belt. The first conveyor belt 51a is guided over a deflection roller 53 stationarily mounted in the machine frame and from there over a deflection roller 57 mounted in a second tensioning carriage 55, in order to then run over a stationarily mounted, motor-driven deflection roller 59 before it reaches the superstructure 45 again. The superstructure 45 and the second tensioning carriage 55 are connected to each other via a chain or a toothed belt 61 which runs via a drive gear 63 (not shown) connected to a motor 63 and a deflecting wheel 65 mounted in the machine frame. Furthermore one recognizes in Fig. 1 an obliquely upwardly extending feed belt 67, which feeds a card web to be laid (not shown) to the first conveyor belt 51 a.

In the area between the lower Florbahnumlenkwalze 49 of the upper carriage 45 and the second guide roller 11 of the laying carriage 7, the first conveyor belt 51a and the second cover 29 are guided parallel to each other in close proximity, so that a guided from the first conveyor belt 51a card web in the said area between the uppercarriage 45 and the laying carriage 7 from the first conveyor belt 51 a and the second cover tape 29 is sandwiched. In this case, the card web is supported by said cover strip 29, which is why this is also referred to as the second conveyor belt in the context of the present invention.

It can be seen in the drawing that, in operation, when the laying carriage 7 performs a reciprocating movement over the delivery conveyor belt 3, the first tensioning carriage 21 executes an opposite movement because the loop lengths of the cover strips 13 and 29 are constant. Furthermore, the uppercarriage 45 and its associated second tensioning carriage 55 perform mutually opposite movements in operation, because they are positively connected by the chain or the toothed belt 61. The second tensioning carriage 55 is necessary to keep the loop length of the first conveyor belt 51a constant.

The present invention is now used in such a nonwoven layerers to lead the card web from the first conveyor belt 51 a to the lower card web deflection roller 49 in the upper carriage 45 turned over to the second conveyor belt 29.

A detailed view according to section x of in Fig. 1 shown first embodiment of the device according to the invention for the guided transport of a card web is in Fig. 2 shown. In this case, the card web 69 is in Fig. 2 outlined by dashed lines, while the guide rollers 47 and 49 have been omitted. Fig. 3 shows a further enlarged view of this embodiment (without card web).

The first conveyor belt 51a, which may also be referred to in the context of the invention generally as Florbahntransportmittel forms at its peripheral outer surface a contact surface with the card web 69. The contact surface of the card web transport 51a has, as with all other embodiments described below, generally one sufficient high friction coefficient, eg due to a rough surface that it entrains the card web 69 when moving.

In addition to the first conveyor belt 51a, which serves to advance the card web 69, the guided web transport means also comprises a card web guiding means 72a, which in the present example is in the form of a crescent-shaped rake having a plurality of spaced-apart, curved tongues 73a. In the FIGS. 2 and 3 For example, due to the cross-sectional view, only one tongue 73a is shown, while the other tongues lie in the drawing plane behind the first tongue 73a. The tongues 73a are preferably coated or polished with polytetrafluoroethylene to ensure a very low coefficient of friction, and in the example of US Pat FIGS. 2 and 3 designed as elastic spring plates.

The tongues 73a designed as spring plates serve to guide the card web 69 in the area of the lower card web deflection roller 49 in the uppercarriage 45 of the web layer, and the curvature of the tongues 73a corresponds to the shape of a peripheral portion of the card web deflection roller 49. The peripheral area of the card web deflection roller 49, which extends from the tongues 73a is preferably slightly smaller than half of the total circumference of the Florbahnumlenkwalze 49 and is defined approximately by the area in which the first conveyor belt 51a rests on the Florbahnumlenkwalze 49. Thus, between the resting on the Florbahnumlenkwalze 49 conveyor belt 51a and the tongues 73a defines a region in which the entrained by the conveyor belt 51a card web 69 is reversed in a guided manner. At the same time, the distances between the individual tongues 73a ensure that entrained air entrained by the conveyor belt 51a can escape. After circulation around the Florbahnumlenkwalze 49, the card web 69 is then on the horizontal stored current section of the second conveyor belt 29, from this moved to the laying carriage 11 and thereby covered by the first conveyor belt 51 a from above.

The tongues 73a designed as spring plates are fastened to a rotatable shaft 75, which is arranged above the lower card web deflection roller 49 in the uppercarriage 45. The shaft 75 may be slidably disposed in the radial direction, whereby the distance of the tongues 73a to the first conveyor belt 51a and the lower Florbahnumlenkwalze 49 can be adjusted. By rotating the shaft 75, the bias of the spring plates 73 a in the direction of the conveyor belt 51 a can be adjusted. For this purpose, for example, the illustrated sickle shape of the tongues 73a is suitable. As a result, the pressing force of the tongues 73a on the card web 69 in the region of the lower card web deflection roller 49 is set.

The spring plates 73a have, for example, a distance of 5 to 10 mm and may for example be about 20 to 30 mm wide and about 0.5 to 2 mm thick. They are evenly distributed over the entire width of the conveyor belt 51a, which can extend over several meters.

The adjustment of the bias of the tongues 73a can be done mechanically by rotating the shaft 75, but also pneumatically. In addition to the advantage of removing drag air through the intermediate regions between the tongues 73a, the shape of the card web guiding means 72a according to the invention also has the advantage that thick spots in the card web 69 can move one or more tongues 73a away from the contact surface of the transport belt 51a, counter to the biasing force. without hindering the transport process of the card web 69 or affecting the concerns of the other tongues on the card web 69. Thus, blockages in the deflection of the lower Florbahnumlenkwalze 49 are excluded. This also applies to all embodiments described below.

In Fig. 3 one recognizes different positions of a tongue 73a. The various positions can be achieved on the one hand in the default setting by rotating the shaft 75 in order to ensure an adaptation to the respective thickness of the card web 69. At the same time, the dot-dashed positions of the tongue 73a also represent possible deflection positions of the tongue 73a, which can be caused by the card web 69 against the spring force of the tongues 73a.

In the region of an outer position of the tongues 73a, a sensor 77 (FIG. Fig. 3 ) can be arranged, which ensures that the tongues are quickly withdrawn from the card web in the event of excessive deflections, for example, for an interruption of the operation of the web laying machine or in order to make room for the card web. Alternatively, a control command can be given by the sensor 77, which releases the locking of the shaft 75, so that it can rotate under the outgoing on the tongues deflected by the card web force.

In addition to the elements described so far, a horizontally displaceable air discharge means 79 can be arranged in the area of the inlet gusset of the two conveyor belts 51a and 29 for the removal of drag air supplied by the second conveyor belt 29. The means 79 for discharging the entrained air entrained by the second conveyor belt 29 may be integrally formed, may also have an end portion 81 in which air passage openings (not visible) are present. The Luftableitmittel 79 may for example be formed as a plastic block, the end portion 81 extends obliquely from above into the inlet pocket of the two conveyor belts 51 a and 29.

In the Fig. 4 illustrated second embodiment corresponds to the embodiment of Fig. 3 except that the tongues 73b forming the sheet guide means 72b are configured as crescent-shaped disks of rigid plastic which can be rotated against a spring force with respect to the shaft 75. In Fig. 4 Two possible positions of the tongues 73b are shown.

A third embodiment of the device according to the invention for the guided transport of a card web is in the FIGS. 5 and 6 shown. The embodiment corresponds to that in the Fig. 1 to 3 1, with the difference that the bias of the tongues 73c forming the card web guiding means 72c is effected by individual application by means of weights 82. This has the advantage that the pressure from the tongues on the card web is independent of the extent of the deflection of the tongues through thick places in the card web.

A fourth embodiment of the device according to the invention for the guided transport of a card web, which in the FIGS. 7 and 8 is shown, shows a one-piece shape of the tongues 73d and the means 80 for deriving the entrained by the second conveyor belt 29 Entraining air. Both elements are formed as a coherent part, whereby manufacturing costs are saved.

In Fig. 9a An application of the invention is shown in a range of card web transport as found on the napkin side of a carding machine. At a carding pile is usually taken at two in the circumferential direction of the card roller dumbbell consecutive positions of upper and lower customers as two card webs, which are then superimposed. Thus, the felt web removed by means of the upper pickup is relined onto the card web, which has been removed by means of the lower picker, both webs being brought to the doubling point on card web transport means.

Fig. 9a shows a further combined variant of two devices according to the invention for the guided transport of a card web. In this case, the card web 69 is entrained by a conveyor belt 51a, which enters at an angle from above and which is guided around a card web deflection roller 49, and is initially directed in a vertical direction by means of a card web guiding means 72a designed almost identically to the first embodiment. A difference from the first embodiment, however, is that the tongues 73a extend only over a smaller peripheral portion of the card web deflection roller 49.

The substantially vertically extending card web 69 is then taken up by a fifth embodiment of the device according to the invention for the guided transport of a card web and forwarded. In this embodiment, the card web transport means 51e is formed by a deflection roller, which also has a rough surface and thus produces a frictional connection with the card web 69. The deflection roller 51e moves in the direction opposite to the Florbahnumlenkwalze 49 direction of rotation, so that ultimately takes place a transition of the card web 69 from a first conveyor belt 51a on a second horizontal conveyor belt 92 without reversing the card web 69. If necessary, a further card web can be located on the second transport belt 92, as is preliminary to Fig. 9a has been explained, but not shown here.

The card web guiding means 72e is disposed opposite to a peripheral portion located in the lower portion of the card web deflection roller 51e and in turn has tongues 73e corresponding to the shape of the peripheral portion of the deflecting roller 51e in the direction of movement the card web 69 are curved and come very close to the second conveyor belt 92 with its end region. Also in this embodiment, the aforementioned possibilities of adjusting the biasing force and the design of the tongues are applicable.

One opposite Fig. 9a simplified embodiment is in Fig. 9b shown. It differs from the one after Fig. 9a in that a pile guiding means 73e only faces the deflecting roll 51e. This embodiment is useful in applications where the requirements are not as high as in the case of Fig. 9a , Incidentally, the embodiment of FIG Fig. 9b those of Fig. 9a , which manifests itself in the same reference numerals used only by the suffixes, the detailed description of which can therefore be omitted here.

Fig. 9c shows a variant of the embodiment of Fig. 9b , It differs from that Fig. 9b in that the deflection roller 51e of Fig. 9b is replaced by a two mutually parallel guide rollers, endlessly circulating Flortransportband 51j, which has a accompanying the card web, leading downward Trum, which consists of a plurality of mutually spaced, mutually parallel tongues 73j existing Florführungsmittel is opposite to the card web against the mentioned strand of Florführungsbandes 51j press. These tongues 73j are elongated and adapted at their lower end to the course of the circumference of the lower guide roller of the web conveyor belt 51j. As shown, this embodiment of the invention is suitable for applications in which a the (upper) card web zoom leading pile conveyor belt 51I is substantially horizontal and a descent of the (upper) card web 69 is to take place on a lower pile conveyor belt 92.

The Fig. 9d and 9e show in comparison to the embodiments of the Fig. 9a to 9c simplified embodiments that dispense with moving web conveyor means in the region of the discharge end of the card web 69 leading down Flortransportbandes 51 a. In the embodiments of the Fig. 9d and 9e the card web 69 is guided only by a pile guiding means 73k in the form of a plurality of mutually spaced, mutually parallel tongues in the transition region from the advancing card web transport belt 51a to the lower, discharging card web transport belt 92. In this case, the transition in an acute angle according to Fig. 9d or in the right one Corner with suitable fillet according to Fig. 9e be designed, which is achieved by appropriate shaping of the pile guiding means 73k. In the illustrated embodiments, it is assumed that the transport speed of the lower, discharging web conveyor belt 92 is slightly greater than that of the upper, leading Flortransportbandes 51a, so that in the card web 69, a certain train is generated, which the card web in contact with the card web guide means 73k holds.

Fig. 10 shows an application, the transfer of a card web 69 from a feed belt 115 in a nip between two pinch rollers 114. The pinch rollers 114 may be, for example, calender rolls for pretreatment of the card web 69, or the inlet rollers of a nonwoven.

For example, in DE 43 04 988 C1 a method for laying a fleece from a fed card web is described in which by cyclically raising and lowering the flour driving a nonwoven fabric a cyclic fed by a constant speed pile fabric card before it enters the nonwoven is cyclically stretched and compressed. For this purpose, it is necessary to define a draw zone before the entry into the nonwoven, one end of which is determined by the feed belt and the other end by the inlet of the web laying.

If now according to Fig. 10 the infeed region of the nonwoven layer is configured with two nip rolls 114 forming a nip and upstream of which is arranged a supply belt 115 for the card web 69, then the card web 69 is located in the region between a deflecting roll 116 arranged upstream of the nip rolls 114 and the supply belt 115 deflecting Pinch rollers 114 guided by a Florführungsmittel 73m, which extends from the guide roller 116 to just before the nip between the two pinch rollers 114. This pile guiding means 73m consists of a plurality of mutually spaced, mutually parallel tongues whose root is located on the side of the guide roller 116 and whose ends rest in the region of the lower pinch roller 114 on the card web 169. The tongues are also on the guide roller 116 on the card web 169 and generate in this way the necessary friction between the card web 169 and their respective pad, which is necessary to the desired stretching effect in the sense of DE 43 04 988 C1 to produce given doctrine.

A sixth embodiment of the guided transport device according to the invention a flagpole is in Fig. 11 shown. The application of this embodiment is, for example, the horizontal transport of card webs on a circulating at very high speed conveyor belt 51 f ,. In this case, the conveyor belt 51f running from left to right in the drawing represents the card web transporting means, and the card web guiding means 72f are again tongues 73f biased from above against the conveyer belt 51f. In this case, however, the tongues 73f are not sickle-shaped, but J-shaped, with the bent root 95 of the tongues wound around a shaft 97, while the other, in the drawing right-facing end portion 99 over a certain area against the surface Card web 69 is biased. Again, the tongues 73f can be made of the same materials as in the first embodiment, and also the various adjustment possibilities of the contact pressure are applicable here. In addition to the force applied by the tongues 73f, which is intended to prevent lifting of the card web 69, entrained entrained air above the conveyor belt 51f is discharged through the tongues 73f. If the conveyor belt 51f is designed as a screen belt, as is customary, for example, for the removal of a spunbonded web from a spunbonded web, additional means for draining tow air may be provided underneath the conveyor belt 51f, such as the illustrated deflector elements 101, which are similar in cross-section to aircraft wings. For longer transport distances it makes sense to arrange a plurality of card web guiding means 72f in succession.

A related thereto seventh embodiment of the device according to the invention for the guided transport of a card web can also be used in a Florstreckwerk.
Fig. 12 to 14 show various embodiments of such an application. In the strip transition formed by the drafting system from a first conveyor belt 51g to a second conveyor belt 102, the first conveyor belt 51g is guided around a first deflecting roller 103, while the second conveyor belt 102 is guided around a second deflecting roller 105. Both guide rollers 51g, 102 face each other axially parallel and rotate in the same direction, but their speed can be adjusted independently. Above the deflecting rollers 103, 105, in each case a card web guide means 72g with tongues 73g is arranged in the manner described above. Due to the bias of the tongues 73 g on the card web 69, the contact pressure can be set variably such that such an arrangement can be used as drafting device for the card web 69. For this purpose, only the second guide roller 105 and thus the second conveyor belt 102 must move slightly faster than the first guide roller 103 and thus the first conveyor belt 51g, whereby between the two clamping points above of the guide rollers 103, 105, which are formed by the tongues 73g of the card web guiding means 72g, the web is stretched in the direction of movement and thus stretched to a thinner card web 69.

As in the Fig. 13 shown eighth embodiment of the device according to the invention for the guided transport of a card web is shown, in turn, the use of spaced apart spring washers 73h instead of spring plates conceivable.

When transferring a card web from a conveyor belt to a second conveyor belt at the same height, a guide of the card web is particularly necessary if, because of the large width of the card web, the deflecting rollers of the web conveyor belts must have a relatively large diameter for reasons of strength. For example, with a web width of 5 m, the guide rollers have a diameter of up to 300 mm, and in this order of magnitude is then the length of the gusset between the rollers, which must be bridged by the card web. In Fig. 14 a ninth embodiment of the device according to the invention for the guided transport of a card web is shown. Here, only a single card web guiding means 72i with tongues 73i is described, whose end region 111 resting on the card web 69 extends over both deflecting rollers 103, 105 of a card web transfer point between two adjoining web transport belts 51i and 102 and at the respective clamping points by correspondingly adjustable weights 113 is charged.

There are also any combinations of the elements of the embodiments of the device according to the invention for the guided transport of a card web described in detail conceivable.

Claims (21)

Device for guided transport of a card web,
with a card web transport means (51a-i) for advancing the card web (69) having a peripheral outer surface, at each time part of the peripheral outer surface forming a contact surface for frictional engagement with at least parts of the card web (69) to be transported, and
with a card web guiding means (72a-i) having a plurality of spaced side-by-side, curved tongues (73a-i) disposed opposite to at least part of the contact surface of the card web transporting means (51a-i) in the direction of movement of the card web (69 ) and thus form a guide surface for guiding the web (69) flat, wherein the guide surface has a lower coefficient of friction than the contact surface of the card web transport means (51a-i), and wherein each tongue (73a-i) individually against a force in one direction away from the contact surface of the card web transport means (51a-i) is movable. Apparatus according to claim 1, characterized in that the tongues (73a-i) are polished or coated with polytetrafluoroethylene. Apparatus according to claim 1 or 2, characterized in that the tongues (73a-i) are elastic spring plates. Apparatus according to claim 1 or 2, characterized in that the tongues (73a-i) are rigid discs which are movable against a spring force. Device according to one of the preceding claims, characterized in that the tongues (73a-i) are biased in the direction of the contact surface of the card web transport means (51a-i) by means of springs or weights (82, 113) or pneumatically. Apparatus according to claim 5, characterized in that means are provided, with which the bias of the tongues (73a-i) is adjustable. Device according to one of the preceding claims, characterized in that means are provided with which the distance between the tongues (73a-i) and the contact surface of the card web transport means (51a-i) is adjustable. Device according to one of the preceding claims, characterized in that the card web transporting means (51a-i) is a transport belt (51a-d) running around a plurality of guide rollers (47, 49) whose peripheral outer surface forms the contact surface, wherein the part of the contact surface, the at the respective time the Florkahnführungsmittel (72a-d) opposite, is always in the circulation area to a Florbahnumlenkwalze (49). Apparatus according to claim 8, characterized in that the conveyor belt (51 ad) is guided at an acute angle to the Florbahnumlenkwalze (49). Apparatus according to claim 8 or 9, characterized in that the conveyor belt (51a-d), starting from the Florbahnumlenkwalze (49) extends substantially horizontally and a second conveyor belt (29) below at a small distance parallel to the first conveyor belt (51a-d) , Device according to one of claims 8 to 10, characterized in that the curvature of the tongues (72a-d) corresponds to the shape of a peripheral portion of the Florbahnumlenkwalze (49). Apparatus according to claim 10 or 11, characterized in that above the second conveyor belt (29) in the region of an inlet gusset between the two conveyor belts (51a-d, 29) means (79, 80) for discharging by the second conveyor belt (29). entrained drag air is arranged. Apparatus according to claim 12, characterized in that the means (79, 80) for discharging the entrained by the second conveyor belt (29) entraining air has an end portion (81) extending obliquely from above to the second conveyor belt (29) and air passage openings having. Apparatus according to claim 13, characterized in that the card web guide means (72d) and the means (80) for discharging the drag air entrained by the second conveyor belt (29) are formed as one continuous element. Device according to one of Claims 1 to 7, characterized in that the card web transporting means (51a-i) is a card web deflection roller (51e) which is located in the transitional area between a first conveyor belt (51e) entering at an angle from above and a second, horizontally running lower transport belt (92) is arranged. Apparatus according to claim 15, characterized in that the curvature of the tongues (73e) corresponds to the shape of a peripheral portion of the card web deflection roller (51e). Device according to one of Claims 1 to 7, characterized in that the card web transporting means (51a-i) is a transport belt (51f-i) running around a plurality of deflecting rollers, whose peripheral outer surface forms the contact surface, the part of the contact surface which at the respective time the card web guide means (72f-i) is opposite, straight. Apparatus according to claim 17, characterized in that the tongues (73f-i) are curved in the direction of the transport direction of the conveyor belt (51f-i) and an end region (99, 111) of the tongues (73f-i) against the conveyor belt (51f-i) i) is biased. Device according to claim 17 or 18, characterized in that a roller (100, 103, 105) is arranged underneath the part of the contact surface which, at the respective time point, is opposite the card web guiding means (72f-i). Apparatus according to claim 19, characterized in that two conveyor belts (51g-i, 102) are arranged to form a belt transition, that a deflection roller (103) of the first conveyor belt (51g-h) and a deflection roller (105) of the second conveyor belt (102 ) are axially parallel to each other, wherein each of the two guide rollers (103, 105) in the same direction with independently adjustable speed is rotatable, and that two Florkahnführungsmittel (72g-h) are provided, each of which over one of the two guide rollers (103, 105 ) is arranged, so that a drafting system for stretching the card web (69) is formed. Apparatus according to claim 19, characterized in that two conveyor belts (51i, 102) are arranged in such a band transition, that a deflection roller (103) of the first conveyor belt (51i) and a guide roller (105) of the second conveyor belt (102) parallel to each other axis each of the two deflection rollers (103, 105) is rotatable in the same direction with independently adjustable speed, and that the end portion of the tongues (73i) of the single card web guiding means (72i) extends over both guide rollers (103, 105) and above both Deflection rollers (103, 105) is biased against both conveyor belts (51i, 102), so that a drafting system for stretching the card web (69) is formed.

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