EP1975287B1 - Web laying device - Google Patents

Abstract

Apparatus has an endless laying carriage conveyor belt (14) that travels around exclusively in the laying carriage (5). It has upper and lower strands (14o,14u) that extend between one of the laying rollers (12) and a deflecting roller (15) around which they partially wrap. A certain length of the card web (11) to be laid is supported from underneath by upper strand of the laying carriage conveyor belt in the section adjacent to the laying gap. This length is covered by a portion of the web entrance conveyor belt (6) that extends between the upper carriage (4) and the laying carriage.

Description

Field of the invention

The invention relates to a nonwoven with a superstructure and a laying carriage, which are guided in a machine frame above a circulating Abliefertransportbandes transversely to the transport direction, and with conveyor belts, which sandwiches a to be deposited web on its way from a pile entrance to a Ablegespalt include between them, for depositing the nonwoven fabric fed card web in partially overlapping layers on the delivery conveyor belt.

State of the art

Out EP 0 865 521 B1 is known a nonwoven layering apparatus of the aforementioned type, in which a first pile conveyor belt feeding the web is guided both through the uppercarriage and through the laying carriage and continues to run through an auxiliary carriage located below the delivery conveyor belt, which supports a tensioning roller and serves to to keep this pile conveyor taut. A second pile conveyor belt is also passed through the superstructure and the laying carriage and passes through a second, below the Abliefertransportbandes in the machine frame transversely movable auxiliary carriage, which supports a further tension roller and serves to keep the second Flortransportband taut.

The Flor supplying first Flortransportband runs in the superstructure on two arranged at different heights of rollers, which are offset transversely to their axial direction against each other, so that there is an obliquely downward inclined Floreinlauf. This oblique Floreinlauf is accompanied in the superstructure of the second Flortransportband, which runs laterally in the area between the superstructure and the laying carriage parallel to the first-mentioned Flortransportband and encloses together with this to be deposited pile on both sides. Because the two pile conveyor belts on the lower guide roller in the upper carriage can not be performed parallel to each other, because there are different radii of rotation and thus caused friction effects that could affect the guided pile, the second pile conveyor belt on the upper carriage in the region of said lower guide roller over a total of four separate deflection rollers guided before it approaches the first Flortransportband again. Corresponding measures are also taken for the first pile conveyor belt on laying carriage, since this band can not be performed together with the second pile conveyor belt in the laying gap on laying carriage for the same reasons explained.

The strands of the two pile conveyor belts leaving the laying carriage at the discharge gap extend close to the delivery conveyor belt and assume the function of covering the laid nonwoven there in order to protect it against aerodynamic impairments resulting from the movement of the laying carriage.

This results in an overall very complicated course of the two Flortransportbänder by the superstructure and the laying carriage and the two tensioning carriages with a variety of Bandumlenkstellen and a fairly large strip length.

A much simpler and shorter course of bands involved in the transport of piles is in the Wagenlegern, as they from " Nonwovens "by W. Albrecht, H. Fuchs, W. Kittelmann, Verlag WILEY-VCH, Weinheim, 2000, page 161 are known. The advantage of such a Wagenlegers consists in an extremely simple management of the bands involved in the pile transport, all of which are relatively short and run only a few deflection points. However, the pile guide is open by the Leger as well as the pile tray on the delivery conveyor belt. As a result, the pile is exposed to a great extent aerodynamic influences that emanate from the movement of the car and can lead to a blowing of fibers and uneven pile storage, especially in the edge region of the laid fleece. The working speed of such a webbinder is therefore very limited. Another disadvantage of said trolley is that with them no pressure on the top of the laid web can be exercised without causing significant distortions, bulges and wrinkles in the web. This type of leger has therefore been displaced by double loopers, for whom the fleece layer according to the above EP 0 865 521 B1 is one of many examples in which the pile is passed in its passage between the tapes, from where the term "sandwich-casual" comes from. In the non-wovens of the latter type, these tapes also serve as a cover for the deposited fleece and thus protect it from the mentioned air turbulences, admittedly at the expense of the mentioned complicated tape guide.

Overview of the invention

The invention has for its object to provide a nonwoven, the type mentioned above, which has a simplified course of the belts involved in the pile transport and on the pile guide, while allowing a high operating speed.

This object is achieved by the invention defined in claim 1. Advantageous embodiments of the invention are the subject of the dependent claims.

The invention provides a novel combination of a feeder and one of the known sandwichers. It takes over from the sandwich-makers, the movable pile inlet, which is laid in the superstructure, used as a laying carriage such as is known by the Wagenlegern, in which a car circulates an endless conveyor belt, moves superstructure, laying carriage and despatch conveyor but so close together that the card web is sandwiched between conveyor belts on their way from the pile inlet to Ablegespalt and the laid web on the delivery conveyor belt touched by the lower strand of the conveyor belts, so is covered.

It is thus a special feature of the invention that the pile guide in laying carriage serves an endless pile conveyor belt, which rotates exclusively in the laying carriage and is thus moved back and forth together with this transverse to the delivery conveyor belt. This endless belt, which revolves only in the laying carriage, on the one hand participates in the transport of the card web in the direction of the depositing gap and on the other hand covers the nonwoven fabric produced on the delivery conveyor belt and produced from the laid card webs. While in Wagenlegern because of the open tape guide the conveyor belts had to have a certain surface structure to ensure the transport function, taken over by the Wagenlegern, circulating in the laying carriage conveyor belt required for covering the fleece smooth surface, since the transport function on the card web through whose sandwich-like inclusion between the lower run of the web leading in and guided through the Floreinlauf conveyor belt, hereinafter referred to as Floreinlauf conveyor belt, and the upper run of circulating in laying carriage conveyor belt, hereinafter Legewagen conveyor belt, is ensured.

The laying carriage conveyor belt wraps except one of the Ablegespalt limiting rollers, hereinafter called Ablegewalzen, also mounted in the laying carriage at a distance from the laying rollers deflection roller, which, if it is mounted vertically adjustable in the laying carriage, opens up the possibility of the direction of movement of the laying carriage in a special way Take into account. If you make the diameter of this guide roller smaller than that of the associated first depositing roller, can be achieved by height adjustment of the guide roller and further, to be discussed in more detail later features that in both directions of movement of the laying carriage on the laid fleece optimum coverage conditions by said Legewagen- Result conveyor belt.

Preferably, the nonwoven layer according to the invention is equipped with an oblique pile inlet, comparable to the prior art according to the aforementioned EP 0 865 521 B1 Located on the movable superstructure. The card fed on the upper carriage reaches the upper run of the carriage carriage, from which it is transported in the laying gap on the laying carriage. It is accompanied and covered by the leading the Flor web Floreinlauf conveyor belt, which runs on the laying carriage via a guide roller and from there via the second depositing roller through the laying gap, from where this tape extends transversely across the delivery conveyor belt and takes over covering function there. Said guide roller is the only roller which serves to prevent the described frictional effects, which result when two bands enclosing the web between them run around one and the same guide roller and therefore describe webs which have different radii. Leaving the laying gap, the pile infeed conveyor belt runs over the laid fleece and, via a tensioning roller mounted in a movable tensioning carriage, back to the inclined pile infeed.

The invention is characterized in that there are extremely few deflection points for the card web and the bands involved in their leadership. However, it requires a little more space at the side of the delivery conveyor belt for the movement of the in his direction of movement on the delivery conveyor belt laterally sweeping laying carriage. The nonwoven layer according to the invention is therefore of particular interest for small laying widths.

The invention also has the advantage that a real sandwich guidance of the deposited web for all possible pile thicknesses can be realized, because the inventive design of the web laying allows the florführenden tapes in the area between upper and laying carriage in a very simple manner in height against each other adjust. The spacing of the bands can be made zero in this range. For this purpose, it is sufficient if the trajectory of the laying carriage is made adjustable in height. The desired contact between the lower strands of the Flor depositing bands and the laid fleece can be made by adjusting the height of the delivery conveyor belt in the base frame and reach to light pressing.

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

Brief description of the drawing

The single drawing shows a schematic view of an embodiment according to the invention.

In the drawing, only the essential elements of the invention are shown as they are necessary to explain them. The superfluous is not shown in order not to burden the drawing with details that are not necessary to explain the invention.

Detailed explanation of the illustrated embodiment of the invention

The drawing shows a preferred embodiment of the invention. In it, a nonwoven is shown schematically, consisting of a stored in a base 1 Abliefertransportband 2, which is for example a slat belt and of which a deflection roller is shown, a in a machine frame 3 (shown schematically) transversely to the transport direction of the delivery conveyor belt 2 movable upper carriage 4 and one below the same transversely to the delivery conveyor belt 2 movable carriage 5.

Through the superstructure 4 and the carriage 5 runs a florführendes conveyor belt, which is hereinafter referred to the distinction Floreinlauf conveyor belt 6 and which runs over several mounted in the machine frame 3 guide rollers, some of which are stationary guide rollers and another one on a horizontal in the machine frame 3 back and forth movable carriage or clamping carriage 18 mounted tension roller 7 is. Of the stationary rollers at least one roller 24 is driven, which is symbolized in the drawing by two blackened sectors.

The superstructure 4 has two guide rollers 8 and 9, which are arranged at different heights and laterally offset from each other, so that in a known manner results in an obliquely downward Floreinlauf. At the lower guide roller 9, the pile infeed conveyor belt 6 is deflected by more than 90 °. He stands there preferably a stationary in the uppercar 4, but yieldingly movable pile guide device 10, which serves to improve the leadership of a guided from the pile infeed conveyor belt 6 card web 11 and preferably is permeable to air to derive entraining air from the card web 11 as possible unhindered.

In the laying carriage 5, two guide rollers 12 and 13 are mounted parallel to each other at a close distance, which are referred to below as the first and second depositing rollers for distinguishing other guide rollers, as already mentioned above. About the first depositing roller 12 runs an endless Florführungband 14, which rotates only within the laying carriage 5 and is subsequently called Legewagen conveyor belt. This band 14 has an upper run 14o and a lower run 14u. It runs over a deflecting roller 15 arranged at a distance from the first depositing roller 12 and wraps around it. Between the first depositing roller 12 and the deflecting roller 15, a belt spreading device 16 is arranged in the laying carriage 5, which in the illustrated example is formed by two freely running belt guide rollers of relatively small diameter, ie a diameter which is smaller than that of the first depositing roller 12. This belt spreader 16 serves to keep the upper and lower strands 14o and 14u of the carriage transporting belt 14 parallel to each other in the portion between the belt spreader 16 and the first depositing roller 12. The guide roller 15 also has a comparatively small diameter and is mounted vertically adjustable in the laying carriage 5, which is symbolized by the arrow Y.

The laying roller 12 wrapping around the laying carriage conveyor belt 14 forms between the lower belt guide roller of the belt spreader 16 and the first depositing roller 12 distant guide roller 15 from a band portion which is inclined in the direction of movement of the laying carriage 5 to the right obliquely upward, since in this situation the Deflection roller 15 is brought into the raised position shown in the drawing. In the opposite direction of movement of the laying carriage 5, the guide roller 15 is lowered to the height of the lower belt guide roller of the belt spreading device 16 (not shown). The upper run 14o of the laying carriage conveyor belt 14 is supported in its horizontally extending portion between the first depositing roller 12 and the belt spreading 16 from below, for example by a smooth plate 19th

For the height adjustment of the guide roller 15 mounted in the machine frame 3 adjusting devices (not shown) may be present on the guide roller 15 or on this holding movable frame mounted driver (not shown) act selectively, so that the current altitude of the guide roller 15 is made the current position and direction of movement of the laying carriage results. The actuators may e.g. be pneumatic type. Also, the guide roller 15 may be mounted on pivot arms which are mounted in the space enclosed by the band 14 and under the influence of anchored in the laying carriage 5 tension springs or even under the outgoing from the belt 14 tensile stresses, the guide roller in its upper and lower end positions, which are stable in this way, while the intermediate positions are unstable, so that a change in the altitude of the actuators is only triggered, the rest of the movement but done automatically.

In the laying carriage 5, a guide roller 17 is parallel to the two depositing rollers 12 and 13 stored. About this guide roller 17, the pile infeed conveyor belt 6 runs starting from the lower guide roller 9 on the upper carriage 4, until it reaches the second depositing roller 13 and wraps around it. Starting from the second laying roller 13, the pile infeed conveyor belt 6 extends at the same height as the lower run 14u of the laying carriage conveyor belt 14 to the driven deflection roller 24. It is able to cover the nonwoven lying on the delivery conveyor belt 2 and extends beyond the deflection roller 24 2 inter alia on the already mentioned tension roller 7 back to the oblique pile inlet.

As can be seen from the drawing, the path of a card web fed to the card web 11 on the delivery conveyor belt is as follows:

The zoomed-in from the infeed conveyor belt 6 card web 11 runs over the superstructure 4 obliquely downwards in the area between the deflection rollers 8 and 9 mounted there and then passes to the upper run 14o of the laying carriage conveyor 14. From there it is at its top by the Untertrum the pile infeed conveyor belt 6 covered that the lower guide roller 9 partially wraps around and runs in the direction of the laying carriage 5. The card web 11 then passes into the Ablegespalt between the Ablegewalzen 12 and 13, which are partially wrapped by the two bands 14 and 6. From the Ablegespalt enters the card web 11 on the delivery conveyor belt 2. In the drawing, a plurality of superimposed pile web layers are represented by a kind of package.

It should be noted at this point that the distance ratios between the lower strands of the bands 6 and 14 and the delivery conveyor belt 2 are not drawn to scale, because said lower strands are intended to cover the laid web against harmful aerodynamic effects resulting from the movement of the Laying carriage 5 go out, and therefore run in practice in close proximity to the laid fleece or touch this, possibly even with pressure.

For the movement drive of the upper carriage 4, a first toothed belt 20 is present, which runs over a bearing in the machine frame 3 drive pinion 21. The first toothed belt 20 is coupled to the superstructure 4 and the tensioning carriage 18 and thus moves them necessarily synchronously and opposite to each other. For the movement of the laying carriage 5, a second toothed belt 22 is provided, which is coupled to the laying carriage 5 and runs over two mounted in the machine frame pinion 23, one of which is driven. The depositing rollers 12 and 13 are interlocked with each other so that they forcibly rotate counter to each other. They are driven by the contact of the pile infeed conveyor belt 6 at the second depositing roller 13 of the pile infeed conveyor belt 6, which may have for this purpose on its back, which does not come into contact with the card web 11, a suitable surface structuring. In the same way, the laying carriage conveyor belt 14 can be driven by the contact with the first depositing roller 12. Also this one can on its back one have suitable surface structuring. The pile infeed conveyor belt 6 is driven by the deflection roller 24.

In the operation of this fleece layer laying carriage 5 in the machine frame 3 above the base frame 1, d. H. Move transversely across the delivery conveyor belt 2 stored there between the edges of the delivery conveyor belt 2 in the direction of the arrows X. In this case, the upper carriage 4 moves in a known manner with half the speed, while the tensioning carriage 18 is moved with the tensioning roller 7 mounted in it via the first toothed belt 20 in the opposite direction. The length portion of the card web 11, which lies on the upper run 14o of the laying carriage conveyor belt 14, increases as the carriage 5 moves from the position shown in the drawing to the left. Conversely, the length of this section decreases in opposite movement of the laying carriage 5 again.

During the movement of the laying carriage 5 in the situation shown in the drawing to the left, the lower run of the pile infeed conveyor belt 6 at a close distance over the laid fleece with a relation to the speed of the laying carriage 5 double speed. So that no disturbing effects on the laid fleece are caused, this pile infeed conveyor belt 6 should be as smooth as possible on its side facing the fleece. The lower run 14u of the laying carriage conveyor belt 14, which is drawn from the laying gap between the two depositing rollers 12 and 13 starting quasi behind the Ablegespalt ago, lies on the laid web without relative speed relative to this, because the peripheral speed of the first depositing roller 12 is just as large As the travel speed of the laying carriage 5, which in turn is as large as the delivery speed of the card web 11 on the pile infeed conveyor belt 6. In this direction of movement of the laying carriage 5, it is therefore possible to completely cover the laid web behind the discharge gap, which on the entire width of the laid nonwoven fabric can be achieved by the deflection roller 15 of the laying carriage conveyor belt 14 is lowered so that also lies in the drawing rightmost section of the lower run 14u of the laying carriage conveyor belt 14 on the laid fleece.

In the opposite direction of movement of the laying carriage 5, the lower run 14u of the laying carriage conveyor belt 14 sweeps over the laid fleece with respect to the speed of movement of the laying carriage 5 at twice the speed. Therefore it is advantageous in this direction of movement of the carriage 5, when between the front end of the fleece covering LeWagen conveyor belt 14 and the nonwoven a gradually narrowing inlet gap is formed, which can be achieved by raising the guide roller 15 in the position shown in the drawing can.

It can be seen from the drawing that the card web 11 experiences only two critical deflections within the batt, namely at the lower guide roller 9 of the upper carriage 4, where it is deflected by about 135 °, and at the inlet into the laying gap, where they are 90 ° is diverted. Particularly simple is the course of flourishing bands. The leading the card web 11 Floreinlauf conveyor belt 6 passes only through the superstructure 4 and the laying carriage 5 and passes through the tensioning roller 7 overlapping tensioning carriage 18 and some fixed guide rollers, as usual. But it lacks a second comparable Flortransportband that is passed through both cars. Instead, the invention is content with a kind of auxiliary belt, which rotates in the form of the laying carriage conveyor belt 14 exclusively in the laying carriage 5 and is transported back and forth with this. Separate masking tapes can be dispensed with, since their function is taken over by the lower strands of the two aforementioned bands 6 and 14.

If the height position of the laying carriage 5 is changed from that of the superstructure 4 to adapt to changed pile thicknesses, and the width of the gap between the pile infeed conveyor belt 6 and the opposite upper run 14o of the laying carriage conveyor belt 14 changes Tapes to hold each other in parallel, it is advantageous if the guide roller 17 can be adjusted in the carriage 5 in height, ie For example, it would be raised accordingly when lowering the laying carriage 5. In order to take into account the height adjustment of the laying carriage 5, preferably also the altitude of the delivery conveyor belt 2 is adjustable. Instead of a change in the altitude of the laying carriage 5 and a change in the altitude of the superstructure 4 can be considered.

Claims (12)

1. Fleece laying device comprising an upper carriage (4) and a laying carriage (5) which are guided in a machine frame (3) so as to move above and transversely to the direction of movement of an output conveyor belt (2) circulating in said frame, for laying a card web (11) supplied to the fleece laying device in partially overlapping layers on the output conveyor belt (2), a card web inlet conveyor belt (6) which supplies the card web (11) and is deflected at the upper carriage (4) and guided through the laying carriage (5), and first and second laying rollers (12, 13) mounted parallel to one another at the laying carriage (5), around each of which a card web carrying belt (6, 14) is wrapped in part and which, by means of the belts (6, 14) wrapped around them in part, form a laying nip through which the card web (11) is guided onto the output conveyor belt (2), characterised in that the belt wrapping around the first laying roller (12) is an endless laying carriage conveyor belt (14) which circulates exclusively in the laying carriage (5) and has upper and lower portions (14o, 14u) extending between the first laying roller (12) and a return roller (15), around which rollers said portions are wrapped in part, the return roller being mounted in the laying carriage (5) at a distance from the first laying roller, and in that the lower portion (14u) of the laying carriage conveyor belt (14o) extends above and transversely to the output conveyor belt (2), a length of the card web (11) to be laid being supported from underneath on the upper portion (14o) of said belt (14) in a portion beside the laying nip, said length of the card web (11) being covered by the portion of the card web inlet conveyor belt (6) extending between the upper carriage (4) and the laying carriage (5) and facing said length of card web.
2. Fleece laying device according to claim 1, characterised in that the card web inlet conveyor belt (6) wraps, in part, around the second laying roller (13) and from there extends over the output conveyor belt (2) at the same level as the lower portion (14u) of the laying carriage conveyor belt (14).
3. Fleece laying device according to either claim 1 or claim 2, characterised in that the upper carriage (4) is guided on a guide means, which is mounted in a height-adjustable manner in the machine frame (3).
4. Fleece laying device according to claim 3, characterised in that the upper portion (14o) of the laying carriage conveyor belt (14) is supported from underneath.
5. Fleece laying device according to any one of the preceding claims, characterised in that the height of the output conveyor belt (2) is adjustable.
6. Fleece laying device according to any one of claims 1 to 5, characterised in that a belt spreader (16) is provided in the laying carriage (5) at a distance from the first laying roller (12) and is configured to keep the upper and lower portions (14o, 14u) of the laying carriage conveyor belt (14) mutually parallel, and in that the associated return roller (15) for the laying carriage conveyor belt (14) is mounted on the side of the belt spreader (16) remote from the first laying roller (12) at a distance from the belt spreader (16), said associated roller having a diameter which is smaller than that of the first laying roller (12) and being mounted in the laying carriage (5) in a height-adjustable manner.
7. Fleece laying device according to claim 6, characterised in that the belt spreader (16) is formed by a roller having a diameter which is the same as that of the first laying roller (12).
8. Fleece laying device according to claim 6, characterised in that the belt spreader (16) is formed by a guide plate means.
9. Fleece laying device according to claim 6, characterised in that the belt spreader is formed by two freewheeling rollers (16) having diameters smaller than that of the first laying roller (12).
10. Fleece laying device according to any one of claims 1 to 9, characterised in that the upper portion (14o; 23o) of the laying carriage conveyor belt (14) is supported from underneath at least in a region beside the first laying roller (12).
11. Fleece laying device according to any one of the preceding claims, characterised in that the laying carriage (5) is guided on a guide means, the height of which in the machine frame (3) is adjustable relative to the height of the upper carriage (4).
12. Fleece laying device according to claim 6 or any one of the claims dependent thereon, characterised in that means are provided in the machine frame to act on the height-adjustable return roller (15) in such a way as to adjust its height.

Images