EP1959038B1 - Device for laying a fleece - Google Patents

Abstract

The lapper has deflection rollers (12a, 12b) forming a baffle surface along with a section of a cover belt (13), and an upper section of another cover belt (5) and an adjoining section of a card web transport belt (26) that are directed towards the surface. A supporting roller (25) is supported in a laying carriage (3), via which the belt (26) is guided to a deflecting roller (28) supported above the roller (12b) in an upper carriage (22), from which the belt (26) leaving the carriage (3) is returned above a level of an upper section of the belt (13) to the carriage (22).

Description

The present invention relates to a device for laying a fleece from a card web, comprising a transversely to a delivery conveyor belt above the same movable laying carriage and a superstructure and several Flortransportbänder for transporting the card web over the superstructure and the laying carriage in a laying carriage formed Ablegespalt for storage the flag web on the delivery conveyor. A device of this kind is from the EP 0 865 521 B1 known.

In the aforementioned document, a nonwoven is described, in which the pile recording has a tape inlet of the transport and laying belts (hereinafter Flortransportbänder) having an obliquely downwardly inclined inlet section with two adjacent running belt sections of Flortransportbänder. The band sections, which are brought together at the entrance to the strip inlet, form a narrow inlet slot adapted to the board thickness and run in the inlet section substantially parallel or at an acute angle to each other and close to each other in such a way that they guide or cover the pile on both sides in the inlet section. In this fleece layer both pile conveyor belts are passed through the superstructure and through the laying carriage.

Also the US Pat. No. 6,195,844 B1 , the EP 0 517 563 B2 , the US 3,877,628 , the EP 0 517 568 B1 , the WO 2004/013390 A1 , the EP 0 659 220 B1 and the EP 1 010 786 B1 show nonwoven, in which both, the card web transporting in the Ablegespalt on the laying carriage and depositing on the delivery conveyor belt bands are passed through both the superstructure and by the laying carriage. The aforementioned publications are only a selection from a larger number of publications that show nonwoven layers of the same tape guide.

The previously known constructions have a relatively complicated course of their pile conveyor belts, in particular on the superstructure, where the one of the web conveyor supporting pile conveyor belts wraps around a deflection roller delimiting the inlet section at its lower end by more than 90 °. The arrangement is further complicated by the fact that the second pile conveyor belt is also passed through the superstructure, according to the construction EP 0 865 521 B1 even such that it is the first pile conveyor belt band in the area of an obliquely downward inlet run closely spaced. All these known constructions is also common that the Flor webbing leading from the entrance of the web laying conveyor belt after leaving the Ablegespalts on laying carriage in close distance to Abliefertransportband or even touches the deposited on this fleece, which may have adverse consequences for this if the Flortransportband has a certain surface roughness because of its intended transport function.

The Applicant has therefore in the European patent application 06 002 075.7 , now EP 1 816 243 A1 , Already proposed a nonwoven with two movable transversely to a delivery conveyor belt main car, in which the card web leading from the input of the nonwoven layer and by an obliquely downwardly guided Floreinport Flortransportband passes through the superstructure, but not through the laying carriage, but above the same at this passed by. In the area between the superstructure and the laying carriage, this pile conveyor belt serves to cover the card web on the upper run of a separate Florführungbandes, which passes through the laying carriage and is reversed there by 180 ° and the lower strand then covers the formed on the delivery conveyor belt fleece. This separate Florführungband, better said first masking tape is an endless belt and is stretched by a movable carriage with the laying carriage. Another endless masking tape also runs through the laying carriage, where it is reversed by 180 °, a mirror image of the aforementioned first masking tape and only serves to cover the laid fleece on the other side of the laying carriage. It passes through the same tensioning carriage as the first conveyor belt.

Because the leading the Floran and she covering between the superstructure and laying carriage Flortransportband only loosely on the card web and runs past the laying carriage, is not ensured at very high speeds that the card web in the Ablegespalt between the two entwined by the Abdeckbändem guide rollers in Legewagen is involved. In addition, the clamping pressure between the two bands sandwiching the pile between the superstructure and the laying carriage is not particularly constant and sometimes not great enough, and with long path lengths of the laying carriage there may also be fluttering of the belt with blow effects caused thereby.

The invention has for its object to provide a device of the type mentioned above, which has a simpler, yet reliable guidance of the belts involved in card web transport and pile storage. This object is achieved by a nonwoven, the features of which are specified in claim 1. Advantageous developments of the invention are the subject of the dependent claims.

The solution of the problem underlying the invention is characterized u.a. characterized in that only one of the florführenden belts, namely the Florbahn leading from the entrance of the nonwoven laying Flortransportband is guided through both main cars of the web laying, namely by the superstructure and the laying carriage. However, this pile transport belt does not leave the laying carriage through the Ablegespalt, but branches off from the card web before it enters the Ablegespalt, and is led out laterally from the laying carriage above the Ablegespalts. For covering the laid fleece two separate endless belts are provided, the two loops horizontally lying Umlenkwalzenanordnungen wrap around each 180 ° and are guided to a common tensioning carriage, which is movable together with the laying carriage and where they turn around two opposing tension rollers wrap around each 180 °. The first of these masking tapes accompanies the pile transport belt between the superstructure and the laying carriage with an upper strand and covers the laid fleece on the delivery conveyor belt with a lower strand.

To ensure that the pile is transported into the Ablegespalt, according to a further special feature of the present invention of the Umlenkwalzenanordnung the second cover strip together with this in the carriage a vertically extending baffle surface is formed, which is spanned there by the second cover, in the laying carriage is guided over two vertically spaced guide rollers. The transport direction of the card web entering the laying carriage aims at this baffle surface. For this reason, it is no longer possible to pass the pile conveyor belt on the laying carriage, but it is in the laying carriage and guided directly on this baffle. The pile conveyor belt is therefore deflected in the laying carriage shortly before the baffle surface of a guide roller upwards and then passed back by means of a further deflection roller on the upper run of the second masking tape and later to the input area of the batt.

The pile conveyor belt is thus guided in the laying carriage via two deflecting rollers mounted at different heights, which are looped around by the pile conveyor belt by about 90 ° or slightly less in each case. Since the pile conveyor belt leaves the laying carriage at an altitude higher than the upper run of the second masking tape, these tapes can not touch each other and thus frictional effects between them can not occur. This is also an essential aspect of the invention.

According to an advantageous variant, the pile conveyor belt may be a screen belt, since the pile conveyor belt only takes over transport function, but is not at the same time masking tape. The discharge of air from the pile when pressing the pile on the upper run of the first cover band is favored. The masking tape can therefore be ideally smooth. However, it can also be provided with a surface structure which produces quasi a form fit between the card web and the band, which avoids the slippage and the undefined sliding of the card web with relative movements between the belt and card web like a screen belt, but is less expensive than a screen belt.

It is provided according to a further advantageous embodiment of the invention to arrange in the upper carriage on the Florauflagefläche of the belt conveyor designed as a belt conveyor side facing away from a suction device which generates a negative pressure on the wire, which helps to keep the card web on the screen belt.

The common for the two masking straps tensioner is preferably arranged to save space below the delivery conveyor belt and therefore runs in opposite direction to the movement of the laying carriage. The masking tapes are preferably smooth so as not to disturb the laid web when touched.

• Fig. 1 eine schematische Ansicht einer Ausführungsform der Erfindung, und
• Fig. 2 eine schematische Ansicht der Einzelheit "X" von Fig. 1.

The invention will be explained in more detail with reference to an embodiment shown in the drawings. It shows:

• Fig. 1 a schematic view of an embodiment of the invention, and
• Fig. 2 a schematic view of the detail "X" of Fig. 1 ,

In the aforementioned drawings are only essential for the explanation of the invention Parts are shown so as not to overload the drawings with unnecessary details. Thus, in particular, a machine frame and the rails on which the movable carriage are guided displaceably in the machine frame, not shown.

Fig. 1 shows a schematic view of an embodiment of the invention in a frontally with respect to the delivery conveyor belt view. One recognizes in Fig. 1 a symbolically represented by a rectangle, endless circulating despatch conveyor belt 1, which is intended to carry away a laid web in a direction perpendicular to the drawing plane transport direction. On the delivery conveyor belt 1 is just a laid start section of a card web 2. About the delivery conveyor belt 1 is a laying carriage 3 on rails (not shown) moved back and forth. In the laying carriage 3 are in accordance with the Fig. 1 and 2 five guide rollers freely rotatably mounted. A first deflection roller 4 is partially wrapped by a first cover strip 5, which has a lower strand 5u, according to Fig. 1 above the delivery conveyor belt 1 to a driven guide roller 6, via a further stationary guide roller 7 and to a guide roller 8 which is rotatably mounted in a first tensioning carriage 9, which is below the Abliefertransportbandes 1 transverse to this on rails (not shown) movable. Of the mounted in the tensioning carriage 9 guide roller 8 said cover strip 5 extends over two further stationary guide rollers 10 and 11 back to the laying carriage 3. The driven guide roller 7 is coupled to a motor (not shown) and is intended to cover the first cover 5 in to power different directions.

Similarly, a second and a third guide roller 12a and 12b, which are rotatably mounted in the clamping carriage 3, partially wrapped by a second cover 13, which is guided via a driven guide roller 14 and a stationary guide roller 15 to a mounted in the first tensioning carriage 9 guide roller 16 is, which is partially wrapped by the second cover strip 13, from where the second cover strip 13 via further stationary guide rollers 17 and 18 to the laying carriage 3 runs back. The second and third guide rollers 12a and 12b are arranged one above the other at such a distance that the portion of the second cover strip 13 extending between them forms a baffle surface 13p, on which the between the upper run 50 of the first cover strip 5 and the adjacent belt conveyor belt 26 formed gap, in which the card web 2 is sandwiched.

The second cover strip 13 has a lower run 13u, which runs at a close distance above the delivery conveyor belt 1. The driven deflection roller 14 is coupled to a motor (not shown) and is intended to drive the second cover band 13 in different directions.

In Fig. 1 a relatively large distance between the lower strands 5u and 13u and the delivery conveyor belt 1 is shown. This should only slightly simplify the overview. In practice, between these masking tapes and the web deposited on the delivery conveyor belt 1, there is a very small distance or even touching the masking tapes of the laid web, since they are intended to protect it against aerodynamic influences which originate from the movement of the laying carriage. This touching can also be a slight pressure, wherein the contact pressure is preferably adjusted by adjusting the height of the delivery conveyor belt. Therefore, the masking tapes 5 and 13 are preferably smooth on their side facing the laid web.

At the carriage 3, a chain or a toothed belt 19 is mounted, which via a with a motor (not shown) connected to the drive gear 20 and a plurality of guide wheels 21 runs. With the aid of this drive device, the laying carriage 3 can be moved back and forth across the delivery conveyor belt 1 transversely to its transport direction.

In a relation to the height level of the laying carriage 3 elevated position in the machine frame an upper carriage 22 is mounted transversely to the transport direction of the delivery conveyor belt 1 on rails (not shown) movable. The uppercarriage 22 has an upper guide roller 23 and a lower guide roller 24, which are laterally offset from each other. About these two rollers 23 and 24 runs over a fixedly mounted in the machine frame deflecting or support roller 25 supported pile conveyor belt 26, which (not shown) by a pile generator (not shown) zoom in from the entrance of the web laying. In the area bounded by the two guide rollers 23 and 24 in the upper carriage 22, the web conveyor belt 26 is inclined obliquely downwards. Starting from the lower guide roller 24 in the uppercarriage 22, the pile conveyor belt 26 extends parallel to the upper run 50 of the first cover strip 5 into the laying carriage 3. There is above the first guide roller 4, a fourth guide roller 27 is mounted, which deflects the pile conveyor belt by 90 ° or slightly less upwards and thus lifts off the card web. Above the second and third guide rollers 12a, 12b of the laying carriage 3 is a fifth guide roller 28 is mounted, which is looped by the pile conveyor belt in the same arc as the fourth guide roller, but in the opposite direction.

The pile conveyor belt 26 leaves the laying carriage 3 above the upper run 130 of the second cover strip and at a distance to this, wraps around a stationary mounted in the machine frame drive roller and runs from there via a tensioning roller mounted in a second tensioning carriage 30 31, then stationary over several in the machine frame stored deflecting rollers to get to the input of the webbed.

The uppercarriage 22 and the second tensioning carriage 30 are connected to each other via a chain or a toothed belt 32, which runs via a drive gear 33 connected to a motor (not shown) and a deflection wheel 34 which are mounted in the machine frame. Furthermore one recognizes in Fig. 1 an obliquely upwardly extending feed belt 35, which feeds the pile web 2 to be laid to the pile conveyor belt 26.

In the area between the lower deflecting roller 24 of the upper carriage 22 and the first deflecting roller 4 of the laying carriage 3, the pile conveyor belt 26 and the upper run 50 of the first cover strip 5 are guided parallel to each other at close intervals, so that a guided by the Flortransportband 26 card web 2 in the mentioned area between the superstructure 22 and the laying carriage 3 from the pile conveyor belt 26 and the upper run 50 of the first cover strip 5 is sandwiched. In this case, the card web 2 is supported by said masking tape 5, which nevertheless does not need to take over any drive function on the card web supported by it in this area since the web transport belt 26 is intended and capable of doing so.

If the pile conveyor belt 26 is a screen belt, then, as shown in the example, a suction device 36 is advantageously provided in the superstructure 22, as schematically indicated in the drawing, which faces the pile conveyor belt 26 in the region of the inlet line on the side facing away from the pile support surface. In operation, a vacuum built up by the suction device 36 helps to keep the card web 2 on the first pile conveyor belt 26. The use of a wire belt as a pile conveyor belt 26 is particularly advantageous because it is possible with his help, in the area between the superstructure 22 and the laying carriage 3, where two bands are guided in parallel and sandwich the sandwich web 2 between them, the air from the To press out felt 2 without fibers fading sideways and the fiber orientation is disturbed by the outflowing air.

It can be seen in the drawing that in operation, when the laying carriage 3 executes a back and forth over the delivery conveyor belt 1 movement, the first tensioning carriage 9 performs an opposite movement, because the loop lengths of the cover strips 5 and 13 are constant. Furthermore, the uppercarriage 22 and its associated second tensioning carriage 30 perform in operation a mutually opposite movement, because they are non-positively connected by the chain or the timing belt 32. The second tensioning carriage 30 is necessary to keep the loop length of the pile conveyor belt 26 constant.

The kinematics of superstructure 22 and laying carriage 3 are completely identical to those in EP 0 865 521 B1 is described. The movements of laying carriage 3 and upper carriage 22 are coordinated so that when feeding the card web 2 on the feed belt 35 with uniform speed controlled storage of the card web 2 without stretching or compressions can take place within the illustrated web laying on the delivery conveyor belt 1. This also takes into account the fact that the laying carriage 3 in the region of its reversal position must be braked to a standstill and accelerated again. If the card web 2 is supplied at a variable speed, for example because a cyclically operating drafting arrangement is arranged in front of the feed belt 35 and generates an alternating thickness in the card web for the purpose of achieving a cross-profiling of the laid web, the movement can be controlled by independent control Upper carriage 22 and carriage 3 are made in a known manner Florbahnpufferung within the batt. In this case, the buffering required to compensate for the wobbling carriage speed is superimposed on a second buffering required to compensate for the fluctuating pile infeed speed. Depending on the coordination of the timing of the stretching operations with that of the laying carriage movement, these bufferings can possibly be in phase opposition to one another, ie cancel each other completely or partially

Normally, the drives of the masking tapes are controlled by means of the drive rollers 6 and 14 so that the cover strip lying in the direction of movement of the laying carriage 3 simply puts on the laid fleece and this does not move, while in the direction of movement of the laying carriage 3 front cover strip moves with respect to the speed of movement of the laying carriage 3 double speed forward.

One recognizes in Fig. 1 very clear that none of the illustrated cover bands 5 and 13 is passed through the upper carriage 22. Nevertheless, one of these masking tapes, namely the first masking tape 5, with its upper run 50 in the area between the uppercarriage 22 and the laying carriage 3 on the pile transport participates, similar to the prior art. However, the guidance of the bands in the nonwoven layer according to the invention is very simplified compared to the prior art, which also facilitates the replacement of these bands.

The masking tapes 5 and 13 form at the point where they are deflected in the laying carriage 3 by their guide rollers 4 and 12, a gap, which is initially referred to as Ablegespalt. During operation of the nonwoven layer, the first cover strip 5 is driven so that its upper run 50 follows the movement of the pile transport belt 26, because both belts enclose the card web 2 on its way between the upper carriage 22 and the laying carriage 3 between them. So that it does not come to shear forces on the card web 2 by friction on the cover strips in the Ablegespalt, which limit the discharge gap, the first cover strip 5 is preferably driven so that the peripheral speed of the first guide roller 4 in the laying carriage 3 is exactly as large as the Peripheral speed of the second guide roller 12a, but has the opposite direction of rotation.

Fig. 2 shows as a detail "X" Fig. 2 In an enlarged scale, the leadership of the bands 5, 13 and 26 and the deposited card web 2 in laying carriage 3. Infeed into the laying carriage 3, the pile conveyor belt 26 and the first cover strip 5 are guided parallel to each other, so that they include the card web 2 between them. The first cover strip 5 wraps around the first guide roller 4 in the laying carriage by 180 ° and thereby takes the web of sheets to be deposited into the discharge gap between the first guide roller 4 and the second guide roller 12a. The second cover strip 13 wraps around the second guide roller 12a and the third guide roller 12b mounted above the same in the carriage 3 by 180 ° together. It can be seen clearly that of the second cover strip 13 between the two guide rollers 12a and 12b, a baffle 13p is clamped on the exact same the card web 2 aims, which is brought by the two bands 5 and 26. If the inner stop of the card web 2 and the static friction thereof on the cover strip 5 should not be sufficient to allow the card web 2 to trace the sheet properly around the first guide roller 4, so that it comes to a lifting of the cover strip 5, which is in Direction of the Ablegespalts moving second cover strip 13 with its baffle 13p sure that the card web 2 is transported in the Ablegespalt.

The web conveyor belt 26 is lifted off the card web 2 by the fourth deflecting roller 4 mounted above the first deflecting roller 4 and deflected out of its path directed towards the baffle 13p and then passes over the fifth guide roller 28 which is mounted above the third deflecting roller 12b in the laying carriage and wins thereby distance from the upper run 13o of the second cover strip.

The third guide roller 27 is advantageously adjustable within the laying carriage 3 in height, which is symbolized by the double arrow Y to the distance between the first and second guide rollers 4 and 27 and thus the distance between the bands passing over them 5 and 26 to the To be able to adapt the thickness of the processed card web. Preferably, the upper carriage 22 and the laying carriage 3 are also mounted in their height positions adjustable against each other in order to adjust the mutual distance between the upper carriage 22 and the carriage 3 parallel guided bands 22 and 5 can. As an alternative, the lower guide roller 24 may be mounted vertically adjustable within the upper carriage 22, which also by a double arrow Y in Fig. 1 is symbolized.

Preferably, the distance between the first guide roller 4 on the one hand and the second and third guide rollers 12a and 12b on the other hand adjustable to change the width of the Ablegespalts, which is symbolized by the double arrow Z, possibly with appropriate adjustment of the guide roller 16 in the first Tensioning carriage 9 in the direction of arrow Z.

The invention thus enables a very simple management of all participating in the treatment process belts and has the additional advantage that the card web is deflected only twice within the batt, namely on the superstructure by a total of 180 ° and the laying carriage by 90 ° before moving to the delivery conveyor belt arrives. On the one hand the Flortransportband can be optimized for its intended purpose, because it does not need to cover function on laid fleece, and the masking tapes can be made smooth because they do not participate in the pile drive, an optimal treatment of the card web is guaranteed in the nonwoven.

Claims (11)

1. Device for laying a fleece from a card web, comprising a laying carriage (3) movable transversely to an output conveyor belt (1) above said belt, and an upper carriage (22) movable above said laying carriage transversely to the output conveyor belt (1), with endless belts (5, 13, 26) for guiding the card web (2) to a laying nip located at the laying carriage (3), a belt inlet being formed at the upper carriage (22) over which a card web conveyor belt (26) is guided and extends from a lower end of the belt inlet towards the laying carriage (3) and is accompanied in parallel in this portion by a portion (5o) of a second belt (5) at a close distance, the card web (2) being returned together with said second belt up to the laying carriage (3) and through the laying carriage (3) to the belt inlet at the upper carriage (22), characterised in that a first return roller (4) and second and third return rollers (12a, 12b) are freely rotatably mounted in the laying carriage (3), over which rollers a first and a second endless cover belt (5; 13) are guided, each of which are then guided respectively over a movably mounted tension roller (8; 16), and comprise lower portions (5u; 13u) arranged above the output conveyor belt (1), an upper portion (5o) of the first cover belt (5) forming the belt portion accompanying the card web conveyor belt (26) between the upper carriage (22) and the laying carriage (3), and in that the second and third return rollers (12a, 12b) are arranged above one another and form a baffle surface (13p) together with the portion of the second cover belt (13) extending between said rollers, the upper portion (5o) of the first cover belt (5) and the portion of the card web conveyor belt (26) beside said upper portion being directed towards said baffle surface, a fourth return roller (27) beside the baffle surface (13p) being rotatably mounted in the laying carriage (3), via which baffle surface the card web conveyor belt (26) is guided to a fifth return roller (28) mounted above the third return roller (12b), from where the card web conveyor belt (26) leaving the laying carriage (3) is returned above the level of an upper portion (13o) of the second cover belt (13) to the upper carriage.
2. Device according to claim 1, characterised in that the two tension rollers (8, 16) of the cover belts are mounted in a common auxiliary carriage (9).
3. Device according to any one of the preceding claims, characterised in that the card web conveyor belt (26) is a perforated belt.
4. Device according to claim 3, characterised in that a suction means (36) is provided in the upper carriage (22) in the region of an entrance path on the side remote from the card web deposition surface of the card web conveyor belt (26).
5. Device according to either claim 1 or claim 2, characterised in that the card web conveyor belt (26) has a surface structure.
6. Device according to any one of the preceding claims, characterised in that the fourth return roller (27) is mounted in the laying carriage (3) in a height-adjustable manner.
7. Device according to any one of the preceding claims, characterised in that the width of the laying nip is adjustable owing to the adjustability of the mutual distance between the first and second return rollers (4, 12a) in the laying carriage (3).
8. Device according to any one of the preceding claims, characterised in that the output conveyor belt (1) is mounted in a height-adjustable manner.
9. Device according to any one of the preceding claims, characterised in that the upper carriage (22) and the laying carriage (3) are mounted in a height-adjustable manner relative to one another.
10. Device according to any one of the preceding claims, characterised in that a lower return roller (24), located in the upper carriage (22), for the card web conveyor belt (26) is mounted inside the upper carriage (22) in a height-adjustable manner.
11. Device according to any one of the preceding claims, characterised in that the cover belts (5, 13) have a smooth surface.

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