EP3030705B1 - Device and method for producing a net-like thread arrangement - Google Patents

Description

The invention relates to a device and a method for producing reticular scrims, and in particular a device according to the preamble of claim 1, as for example from the DE 23 62 793 B2 or the US Pat. No. 3,422,511 is known.

Essential parts of such known from the prior art device are shown schematically in FIG 4 to 6 shown.

Fig. 4 shows a perspective view of the use of a known device 10 for producing net-like scrim, Fig. 5 a section enlargement of the Fig. 4 , and Fig. 6 again a detail enlargement of the Fig. 5 ,

To facilitate the direction designations is a right-angled xyz axbox in the 4 to 6 introduced.

In this device known from the prior art, a family of longitudinal yarns 3 in a known manner of yarn packages (not shown) in a in 4 to 6 unwound as x- direction direction (longitudinal direction). Transverse to this longitudinal direction x a transverse thread 2 is placed in the transverse direction y . This results in a net-like arrangement of longitudinal and transverse threads.

The transverse thread 2 is guided by a further thread spool (not shown) via a transverse thread layer 4 attached to a rotor arm 5 to a transverse thread laying screw 1 . In Fig. 4 is a schematic overall view of such a known device 10 for producing net-like scrim with the complete rotor arm 5 and one each left and right of the thread tray level ( xy- plane) mounted Querfadenablageschnecke 1 shown. In Fig. 5 and 6 in each case only one Querfadenablageschnecke 1 is seen on the left edge of the picture.

In operation of the known device 10 for producing net-like scrim, the transverse thread 2 is introduced by the cross-threading 4 in the turns of Querfadenablageschnecken 1 . In this case, the transverse thread 2 lies in transverse thread loops 2 ' around the turns of the Querfadenablageschnecken 1. In Fig. 5 and 6 this is for the in Fig. 4 Querfadenablageschnecke shown in detail on the left edge of the picture shown in detail.

Thus, while the longitudinal yarns 3 are unwound from yarn packages in the longitudinal direction ( x- direction), the Querfadenablageschnecken 1 and the rotor arm 5 rotate about their axes extending substantially in the longitudinal direction ( x- direction) axes of rotation in one another and on the advance of the longitudinal threads 3 concerted way. At the in 4 to 6 shown apparatus 10 with only one rotor arm 5 , the rotational speeds of the Querfadenablageschnecken 1 and the rotor arm 5 are identical.

The transverse thread 2 inserted into the turns of the Querfadenablageschnecken 1 from the transverse thread 4 is transported by the Querfadenablageschnecke 1 due to their rotation to the free end 1a of the Querfadenablageschnecke 1 out.

Since in this example with a single rotor arm 5, the rotor arm 5 and the Querfadenablageschnecken 1 rotate at the same speed, is provided for a continuous and uniform development of the transverse thread 2 and a continuous and uniform feed of the transverse thread loops 2 ' .

In the Fig. 4 Querfadenablageschnecke 1 shown on the right, the in Fig. 4 The transverse thread laying screw 1 shown on the left in the transverse direction ( y- direction) of the thread-laying fabric, after a 180 ° rotation of the rotor arm 5 , takes the thread guided by the transverse threading 4 Cross thread 2 in the same way as those on the left edge in Fig. 5 shown Querfadenablageschnecke 1 . In both Querfadenablageschnecken in Fig. 4 So basically find the same processes as on the in Fig. 5 and 6 shown left picture edge instead.

At the free end 1a of the Querfadenablageschnecke 1 slip the loops 2 'of the transverse thread 2 as in Fig. 5 , but especially the cutting magnification in Fig. 6 shown at the free end 1a of the turns of the Querfadenablageschnecke 1 and the transverse thread 2 is thereby deposited meandering in the longitudinal direction x of the net-like Fadengeleges.

As is known from the prior art, the longitudinal threads 3 need not all be deposited in the same plane on or under (in the z- direction) of the meander-shaped transverse thread 2 . Rather, arrangements can also be selected, as they are in Fig. 6 are shown, in which a part 3a of the longitudinal threads below the plane of the transverse thread 2 and another part 3b of the longitudinal threads above the plane of the transverse thread 2 are stored. For this purpose, the feed directions and speeds of the individual longitudinal threads 3a, 3b and the rotational speeds of the Querfadenablageschnecken 1 and the rotor arm 5 are carefully matched to each other.

Instead of in Fig. 5 and 6 shown arrangement with a rotor arm 5 , it is also possible to use more than one rotor arm. For this purpose, two, three,... N rotor arms can be arranged in a star shape in angular increments matched to their total number about a common axis of rotation (not shown). This means that instead of a rotor arm, for example, two rotor arms, which are arranged offset by 180 °, or three rotor arms, which are arranged offset by 120 °, or n rotor arms, which are arranged offset by 360 ° / n, may be provided.

In such a case, the rotational speeds of the two Querfadenablageschnecken 1 relative to the rotational speed of the rotor arms 5 are reduced accordingly.

The threads 2, 3, 3a, 3b in the yarn layer thus laid are then fixed relative to one another at their points of contact by means of suitable downstream processing methods such as gluing or thermal welding.

In 4 to 6 the transverse thread 2 is deposited in the y- direction, ie perpendicular to the depositing direction x of the longitudinal threads 3 . But this is not absolutely necessary. It is also possible by appropriate tilting of the rotor axis of the rotor arm 5 and suitable positioning of the two Querfadenablageschnecken 1 , the transverse thread 2 at an angle to the longitudinal threads 3, 3a, 3b store. This then leads to known from the prior art reticulated thread layers with parallelogram mesh mesh.

All these aspects of the production of reticular scrims, as in 4 to 6 are shown are in a device according to the preamble of claim 1, as from DE 23 62 793 B2 . US Pat. No. 3,422,511 or GB 2 231 344 A known, solved.

In order to ensure, when using such a known device, that the desired distances in the longitudinal direction ( x ) of the crosswise ( y ) parallel to each other sections of the transverse thread 2 in the deposition of the transverse thread loops 2 ' are observed as accurately as possible, is based on a careful synchronization of the rotational speeds of Rotor arms 5 and the Querfadenablageschnecken 1 to ensure the most homogeneous structure of in Fig. 6 to get shown net-like Fadengeleges. If, for example, there are fluctuations in the rotational speeds of the rotor arms 5 or the Querfadenablageschnecken 1 , this would inevitably lead to variations in the distances between the transverse thread loops 2 ' of transverse cross-thread 2 x and irregularities in the filing of the transverse thread loops 2' , which is regarded as a serious quality defect of such a net-like yarn layer.

However, it turns out in practice that even with the most careful synchronization of the rotational speeds of the rotor arms 5 and the Querfadenablageschnecken 1 at the in Fig. 5 and 6 shown device to undesirable variations in the distance of the longitudinal direction x of the yarn layer parallel sections of the transverse thread 2 comes.

The main reason for these fluctuations is based on the Fig. 6 clear: As long as a loop 2 'of a transverse thread 2 on the in Fig. 6 shown Querfadenablageschnecke 1 , this transverse thread loop 2 'is under a certain tension in the transverse direction ( y- direction), since the transverse thread 2 indeed in the turns of the opposite Querfadenablageschnecke (on the right edge in FIG Fig. 4 positioned). The under Tensioning loop 2 ' thus slides in the turns of a Querfadenablageschnecke 1 along to the free end 1a down.

The moment a loop 2 ', as in Fig. 6 shown is released from the free end 1a of the Querfadenablageschnecke 1 , it slips from the inside of the peripheral wall of the Querfadenablageschnecke 1 on the front side of its free end 1a .

The exact course of this slipping process is influenced by a variety of parameters, such as local surface roughness of the Querfadenablageschnecke 1, local surface roughness of just currently detached from the free end 1a of Querfadenablageschnecke 1 loop segment, local contamination of the screw surface (in particular, for example, by persistent particle abrasion from the transverse thread 2 in the continuous operation of the device 10, local inhomogeneities in the thread material with regard to the local thread thickness, the local thread density, variations in the composition of the thread material due to irregularities in the process of thread production, etc.).

All these uncertainties mean that even with perfect synchronization of the rotational movements of the Querfadenablageschnecken 1 and the rotor arm 5, the conditions in the filing of the Querfadenschlaufen 2 ' after each revolution of the Querfadenablageschnecke 1 for each currently pending at the free end 1a for release cross thread loop 2' change and thus are not reproducible. From Querfadenschlaufe to cross thread loop thus it comes to fluctuations when sliding from the free end 1a of the Querfadenablageschnecke 1 and thus unwanted irregularities in the filing of the transverse thread 2 in the net-like scrim, to sometimes serious deviations of the overall appearance of the yarn layer of an ideal network structure with completely uniform mesh in the web.

The present invention has been devised in view of the above-described drawbacks of prior art devices for making reticular scrims.

In particular, it is an object of the present invention to provide an apparatus for the production of net-like yarn layers and methods of operating such a device as well as netting provided therewith, which are characterized in that hereby Unevenness in the network thread layer and in particular fluctuations in the distance between the longitudinally x parallel sections of the transverse thread 2 and the filing image of the individual loops 2 ' are minimized at the edge of the Netzfadengeleges and thus the most homogeneous network pattern is generated.

This object is achieved by a device according to claim 1 and by a method according to the independent claim 3.

Also the FR 539 822 A as well as the CH 416 535 A each show devices according to the preamble of claim 1. In addition, these references each provide pressure rollers before for connecting the transverse threads with the longitudinal threads in a net-like scrim. However, none of the devices disclosed in these two references show an upper and lower endless belt pair as an auxiliary device for controlling the deposit of the cross thread laying loops released by the transverse thread laying screws in the yarn depositing plane.

The advantages of the present invention will become apparent from the following description of preferred embodiments in conjunction with the figures.

Fig. 1

eine Gesamtansicht einer erfindungsgemäßen Vorrichtung zum Herstellen homogener netzartiger Fadengelege in perspektivischer Darstellung;

Fig. 2

einen Teilausschnitt der Fig. 1;

Fig. 3

in einer perspektivisch gedrehten Ausschnittvergrößerung der Fig. 2 den Vorgang der Querfadenschlaufenablage bei einer erfindungsgemäßen Vorrichtung zum Herstellen netzartiger Fadengelege;

Fig. 4

eine Gesamtansicht einer aus dem Stand der Technik bekannten Vorrichtung zum Herstellen netzartiger Fadengelege in perspektivischer Darstellung;

Fig. 5

einen Teilausschnitt der Fig. 4;

Fig. 6

eine Ausschnittvergrößerung der in Fig. 5 gezeigten Vorrichtung im Bereich des freien Endes einer Querfadenablageschnecke.

Show it:

Fig. 1

an overall view of a device according to the invention for producing homogeneous reticulated filament scrims in perspective view;

Fig. 2

a part of the Fig. 1 ;

Fig. 3

in a perspective zoomed enlargement of the Fig. 2 the process of Querfadenschlaufenablage in a device according to the invention for producing net-like scrim;

Fig. 4

an overall view of a known from the prior art apparatus for producing reticular scrim in perspective view;

Fig. 5

a part of the Fig. 4 ;

Fig. 6

a detail enlargement of in Fig. 5 shown device in the region of the free end of a Querfadenablageschnecke.

Fig. 1 to 3 show an overall view of an apparatus according to the invention for producing homogeneous reticulated filament scrims in perspective view or partial sections thereof in magnification.

In Fig. 1 and 2 In each case, a device 10 according to the invention for producing homogeneous net-like scrim is to be seen in a perspective view, which corresponds to the representations of the device known from the prior art Fig. 4 and 5 correspond. Fig. 3 shows an enlarged detail of the Fig. 2 whose perspective has been additionally turned.

Components containing the in 4 to 6 shown components are denoted by the same reference numerals as in 4 to 6 and will not be explained again in detail below.

• Oberhalb und unterhalb der Fadenablageebene ( x-y -Ebene) sind in sich geschlossene Endlosbänder 30, 31, 40, 41 jeweils um zugehörige Führungsrollen geführt. Die Endlosbänder sind jeweils paarig oberhalb und unterhalb der Fadenablageebene ( x-y -Ebene) angeordnet, wie im Folgenden noch ausführlicher beschrieben wird.

In the Fig. 1 to 3 shown inventive device 10 shows in relation to in 4 to 6 shown, known from the prior art device, the following further components:

• Above and below the thread storage level ( xy plane) closed endless belts 30, 31, 40, 41 are each guided around associated guide rollers. The endless belts are arranged in pairs above and below the yarn deposit level ( xy plane), as will be described in more detail below.

For each endless belt 30, 31, 40, 41 at the left edge of the thread tray plane ( xy plane) in FIG Fig. 1 There is a corresponding endless belt 30, 31, 40, 41 at the right edge of the thread tray plane. In the Fig. 1 this is drawn so that a corresponding endless belt 30 (31, 40, 41) is shown in each case for one endless belt 30 (31, 40, 41) and these two corresponding endless belts 30, 30 (31, 31, 40, 40; 41, 41) at a vertical to the thread storage level and in the longitudinal direction ( x direction) extending xz - plane can imagine mirrored each other. However, this type of mirror symmetry along the xz plane is not an essential feature of the device according to the invention, as will be apparent from the following description.

Preferably, the endless belts 30, 31, 40, 41 of abrasion, elastic and tear-resistant materials are used, and they are made for example of rubber or elastic plastics.

The following is an example of a first endless belt 30 in FIG Fig. 1 closer look. This first endless belt 30 is looped around the four associated guide rollers 301, 302, 303, 304 so that it is self-contained. The first endless belt 30 thereby biases a plane. The endless belt 30 is oriented so that it is arranged substantially parallel to the xz plane.

Accordingly, in Fig. 1 the other endless belts 31, 40, 41 by four associated guide rollers 311, 312, 313, 314; 401, 402, 403, 404 and 411, 412, 413, 414 . Also, each of these three more in Fig. 2 shown endless belts 31, 40, 41 defines a plane extending substantially parallel to the xz - plane. In the following, an ensemble of an endless belt together with associated guide rollers is also referred to as an endless belt assembly.

The core of a device according to the invention for controlling the process of depositing a transverse thread loop 2 at the free end 1a of the Querfadenablageschnecke now based on the fact that the first endless belt 30 above the yarn deposit level ( xy plane) at the left and right edge of a laid down in the yarn storage level xy thread scrim and an associated second endless belt 31 is disposed below the yarn depositing plane ( xy plane) and is oriented or alignable in space so that these endless belts 30, 31 are arranged parallel to the xz plane or can be arranged. In this case, the first endless belt 30 and the second endless belt 31 can be positioned or brought in the horizontal direction ( z- direction) at a distance such that they can force-fit a transverse thread loop 2 ' deposited at the free ends 1a of the transverse laying screws 1 .

In other words: The endless belts 30 and 31, on the one hand above and on the other hand below the yarn deposit level ( xy plane) are mounted so that the aligned parallel to the xz - plane upper endless belt 30 a Querfadenschlaufe 2 ' from above frictionally touches and that the lower endless belt 31, aligned parallel to the xz plane, contacts the same transverse thread loop 2 ' from below in a force-fitting manner. This position is referred to below as the "working position" of the respective endless belt.

The endless assemblies can be mounted from the outset in a permanent working position. In such an approach, the in Fig. 2 Example shown endless belt assemblies of the first endless belt 30 and the second endless belt 31, for example, installed fixed in space and positioned so that a released at a free end 1a of Querfadenablageschnecke 1 Querfadenablageschlaufe 2 ' frictionally between the upper first endless belt 30 and the lower second endless belt 31 is received ,

Alternatively, pivotable endless assemblies may be provided in their respective working position.

It is readily apparent to those skilled in the art, as he can construct a variety of devices, each having the arrangement of an endless belt 30 and 31 with respective guide rollers 301, 302, 303, 304 and 311, 312, 313, 314, ie a respective Endless belt assembly, support and move by means of suitable pivoting mechanisms in space and bring in the above-described working positions. Such a pivoting mechanism may, for example, consist of a mechanical, possibly multi-jointed pivoting arm, to which the endless assembly is fastened and which is pivotable in space with the pivoting arm. Such pivotal mechanisms may each be provided individually for an endless belt assembly. But it is also readily possible to provide complex pivoting mechanisms with more than one (possibly multi-articulated) pivot arm, which allow both the upper endless belt assembly, consisting of the endless belt 30 and the associated guide rollers 301, 302, 303, 304 as well the lower endless belt assembly consisting of the endless belt 31 and the associated guide rollers 311, 312, 313, 314 are simultaneously supported and coordinated with each other in space movable to bring the endless belt assemblies respectively in their working position.

For the core purpose of the present invention, it is ultimately secondary, whether the endless belt assemblies consisting of an endless belt (such as the endless belt 30 ) and associated guide rollers (eg 301, 302, 303, 304 ) by means of suitable pivoting mechanisms in the (temporary) working position are movable or whether they are stationary mounted in their respective (stationary) working position.

Rather, it is ultimately decisive that there is a working position in the device according to the invention in which an endless belt located above the yarn depositing plane ( xy plane) (for example, the endless belt 30 in FIG Fig. 2 ) and an endless belt located below the yarn depositing plane ( xy plane) (eg, the endless belt 31 in FIG Fig. 2 ) can clamp a cross-thread loop 2 ' between them frictionally.

Furthermore, it should be noted that in the discussion of in Fig. 2 an endless belt (eg, the endless belt 30) shown with exactly four associated guide rollers ( 301, 302, 303, 304 ) has been illustrated and explained. However, it will be readily apparent to one skilled in the art that, instead, endless assemblies having a different number of guide rollers may be used. Instead of in Fig. 2 shown four guide rollers per endless belt can easily be provided three, five, six, etc. guide rollers per endless belt assembly, which can be selected as appropriate. In particular, it is also conceivable to use endless belt assemblies with only two guide rollers around which an endless belt is wound. Furthermore, the number of guide rollers from one to the next endless belt assembly can also be varied, and not all endless assemblies need to have exactly the same number of guide rollers. It does not necessarily mean everyone in Fig. 1 shown symmetries between the individual endless modules are observed.

Each endless belt assembly is now designed so that the guide rollers are rotatably mounted and can drive the endless belt wound around them by their rotational movement. For this purpose, those skilled in the art suitable mechanical drive means such as motors and gears readily familiar, and need not be further described below.

Decisive for the present invention is merely that a above the Fadenablageebene ( xy plane) attached first endless belt 30 and a below the thread storage level ( xy plane) attached second endless belt 31 in their respective Working position, whether temporary or stationary, are so mounted that they include a located in the region of the free end 1a of Querfadenablageschnecke 1 but not yet detached from the Querfadenablageschnecke 1 transverse thread loop 2 ' just before the moment of detachment frictionally between them and by a coordinated rotational movement of the guide rollers in each of the two endless belt assemblies controlled in the direction of the forward thrust of the Querfadenablageschnecke 1 can continue to transport.

In other words: By the frictional clamping a Querfadenschlaufe 2 ' before the moment of detachment from the free end 1a of Querfadenablageschnecke 1 between two corresponding endless belts 30, 31 , the transverse thread loop 2' between an upper and a lower endless belt 30, 31 fixed and thereby an uncontrolled jumping off a transverse thread loop 2 ', which is held in tension in the transverse direction ( y- direction) of the yarn layer between the two Querfadenablageschnecken 1 , avoided.

It can not come to uncontrolled movements of the vacant transverse thread loops 2 ' , which could lead to irregularities in the filing image of the transverse thread 2 .

Instead, each of the free end 1a of the Querfadenablageschnecke 1 between the upper endless belt 30 and the lower endless belt 31 recorded loop 2 ' substantially traction-free between the two endless belts 30, 31 included and further transported in the longitudinal direction of the net-like Fadengeleges ( x- direction).

At the end of the area where the upper 30 and lower 31 endless belts are in contact with the transverse thread loops 2 ', the upper endless belt 30 is raised (in the z direction in FIG Fig. 2 ) and the lower endless belt 31 down (in the negative z direction in Fig. 2 ) lifted off the intermediate transverse thread loops 2 ' . As a result, accelerations of the transverse thread loops 2 'in the longitudinal direction of the thread layer ( x direction) or transverse direction thereto ( y direction) are avoided. This leads to a controlled deposition of the transverse thread loops 2 ' on the level of the longitudinal threads 3a lying in the z direction (FIG. Fig. 2 and 3 ).

1. 1) der Abstand in Längsrichtung x zwischen zwei in Querrichtung aufeinanderfolgend abgelegten Abschnitten des Querfadens 2 ist konstant, und
2. 2) die Querfadenschlaufen 2' werden gleichmäßig in den in Querrichtung y außen liegenden Bereichen des netzartigen Fadengeleges abgelegt.

This achieves two goals:

1. 1) the distance in the longitudinal direction x between two successively deposited in the transverse direction sections of the transverse thread 2 is constant, and
2. 2) the transverse thread loops 2 ' are deposited evenly in the transverse regions y outer regions of the net-like yarn layer.

According to this first (in Fig. 2 lying on the left edge of the picture) pair of upper 30 and lower 31 endless belt, which Querfadenschlaufen 2 ' in the region of Fig. 2 enclosed Querfadenablageschnecke 1 between them and can transport and store controlled, is on the right edge of the image (s. Fig. 1 ) a second pair of upper and lower endless belts 30, 31 are provided which operate on the second transverse yarn laying screw 1, respectively.

Together, this first pair of upper 30 and lower 31 endless belt and in Fig. 2 in the image extension on the right corresponding to be provided second pair of upper and lower endless belt together an auxiliary device for the controlled acquisition and storage of released at the free ends 1a of Querfadenablageschnecken 1 cross thread loops 2 ' .

By these measures, the known disadvantages of an uncontrolled and thus inhomogeneous Querfadenablage be avoided in the prior art.

In this case, the endless belts should move 30, 31 with a common identical speed as possible in the longitudinal direction of the yarn layer ( x- direction), said common speed v ₁ should be matched to the feed speed v _{0 of} the Querfadenablageschnecke 1 . If the common speed v _{1 of} the endless belts in the direction of the yarn feed ( x direction) should be identical to the feed rate v _{0 of} the Querfadenablageschnecke 1, so between the endless belts 30, 31 consecutively clamped transverse thread loops 2 ' exactly at the distance deposits, as from the free end 1a of the Querfadenablageschnecke be released, ie the distance between the transverse parallel sections of the transverse thread in the finished scrim corresponds to the pitch h of Querfadenablageschnecken . 1

However, "tuned-in" does not mean that the common speed v _{1 of} the endless belts 30, 31 in the direction of the yarn feed would in any case have to be exactly the same as the feed rate v _{0 of} the transverse yarn feed screws.

Rather, it is within certain practical to be determined tolerance limits, which are essentially determined by the interaction of the parameters feed speed v ₀ of Querfadenablageschnecke, pitch h of Querfadenablageschnecke and inherent mechanical material properties of the transverse thread 2 (eg elasticity of the thread, specific gravity), also possible the common speed of the first and second endless belts 30, 31 to be slightly higher or slightly lower than the feed speed of the transverse yarn laying screw, resulting in an effective spacing of the transverse yarn loops 2 ' in the feed direction (y direction) higher or lower than the pitch h can be the Querfadenablageschnecken 1 .

In other words, in the prior art, the distance of the transverse thread loops 2 ' in a scrim is determined by the fixed pitch h of the Querfadenablageschnecke (s) 1 and can be changed if necessary by a complete exchange of Querfadenablageschnecken.

In contrast, in the apparatus according to the invention, the distance of the deposited transverse thread loops 2 ' in a scrim may be varied for one and the same type of Querfadenablageschnecken 1 by varying the common speed v _{1 of} the endless belts 30, 31 relative to the feed rate v _{0 of} the rigid Querfadenablageschnecken. This results in completely new ways to manufacture thread scrims with sections varying leash intervals of the transverse thread loops 2 ' in one piece in a continuous manufacturing process without interruptions to replace the Querfadenablageschnecken.

The process of the controlled decrease in the free ends 1a of the Querfadenablageschnecken 1 freed cross thread loops 2 ' can be further refined that instead of only a first auxiliary device in the region of the free ends 1a of Querfadenablageschnecken 1 to control the filing process of the Querfadenablageschnecken Released loops 2 'of the transverse thread 2 at least one further, the same construction aid for the first auxiliary device provides, as shown in Fig. 1 and 2 already indicated with the endless belts 40, 41 shown there on the left edge of the picture. Accordingly, one on the right edge of the picture ( Fig. 1 ) arranged pair of an upper 40 and a lower 41 endless belt again a corresponding pair of an upper and a lower edge of the left in Fig. 1 and 2 lying pair of endless belts 40, 41 forms a second auxiliary device for controlling the transport and the storage of transverse thread loops.

This second auxiliary device thus provides exactly the same as the first auxiliary device in each case two pairs of a self-contained upper and a self-contained lower endless belt, which are each aligned relative to the yarn laying plane xy , so that each pair an upper endless belt 40 from above and a lower Endless belt 41 can be brought to rest from below on a transverse thread loop 2 ' , whereby this transverse thread loop 2' is in turn frictionally trapped between this upper and lower endless belt. In this case, means are again provided for driving the endless belts in the second auxiliary device in the direction of the longitudinal threads ( x- direction) so that a transverse thread-laying loop 2 ' trapped between a pair of endless belts 40, 41 of the second auxiliary device is in the feed direction ( x- direction). the transverse thread loop transport of the two endless belts 40, 41 can be further transported.

In Fig. 2 and 3 Thus, it comes to the transfer of a transverse thread loop 2 ', which is enclosed by a pair of upper 30 and a lower 31 endless belt in the first auxiliary device, to a pair of upper 40 and lower 41 endless belt of a second auxiliary device, which is in principle identical to the first Auxiliary device is.

In the Fig. 1 to 3 shown embodiment of a device according to the invention for producing homogeneous net-like scrim thus provides a series connected first and second auxiliary device for Querfadenschlaufentransport, each one in the feed direction ( x- direction) left and right next to the scrim lying pair of an upper and a lower endless belt provide ,

It is in Fig. 1 to 3 on each side of the yarn tray plane, a pair of endless belts 40, 41 of the second auxiliary device are staggered relative to a pair of endless belts 30, 31 of the first auxiliary device, such that the belts of this first pair 30, 31 and this second pair 40, 41 of endless belts in the longitudinal direction x of the net-like Fadengeleges overlap and at the same time the vertical distance (in the z direction) of the upper 40 and the lower 41 endless belt is selected so that the transverse thread 2 slightly between the upper 40 and the lower 41 endless belt is clamped.

If a transverse thread loop 2 ' clamped between the upper 30 and the lower 31 endless belt in the first auxiliary device comes into the region of the upper 40 and the lower 41 endless belt in the second auxiliary device by the forward movement in the x direction, the transverse thread loop 2 is transferred 'from the endless belts 30, 31 in the first auxiliary device to the second pair of endless belts 40, 41 in the second auxiliary device.

• Zunächst betreibt man das Paar der Endlosbänder 30, 31 der ersten Hilfsvorrichtung und das Paar von Endlosbändern 40, 41 der zweiten Hilfsvorrichtung mit derselben Geschwindigkeit.
• Dadurch erzielt man ein Fadengelege mit einem bestimmten Querfadenabstand d₁ in Längsrichtung x des netzartigen Fadengeleges.

If a different speed is selected for the pair of endless belts 40, 41 in the second auxiliary device than for the pair of endless belts 30, 31 in the first auxiliary device, then one can, as in FIG Fig. 3 shown, the distance of the stored in the x direction transverse thread loops 2 ' vary as follows:

• First, the pair of endless belts 30, 31 of the first auxiliary device and the pair of endless belts 40, 41 of the second auxiliary device are operated at the same speed.
• This achieves a scrim with a certain transverse thread spacing d ₁ in the longitudinal direction x of the net-like scrim.

Then, if the velocity v _{2 of} the pair of endless belts 40, 41 in the second auxiliary device is suddenly increased relative to the speed v _{1 of} the pair of endless belts 30, 31 in the first auxiliary device, the transverse loops 2 ' begin to increase in speed of the pair of endless belts 40, 41 in the second auxiliary device at a new distance d ₂ , which is greater than d ₁ , filed. So then the relation d ₂ > d ₁ applies.

Conversely, if one has operated the device for a while so that a Fadengelege was generated with a constant distance d _{1 of} the transverse threads in the x direction and you jump the speed v _{2 of} the pair of endless belts 40, 41 in the second auxiliary device compared to the speed v _{1 of} the pair of endless belts 30, 31 reduced in the first auxiliary device, the cross loops 2 ' starting with the Time of lowering the speed v ₂ at a new distance d ₂ , which is now smaller than d ₁ , are stored. So then the relation d ₂ < d ₁ applies.

In this case, the distances d ₁ , d ₂ between adjacent transverse thread loops 2 ' are respected very precisely.

Thus, can be produced by this embodiment of a device according to the invention completely novel scrims, namely scrim with controllably controlled in the direction of the running threads jumps in the distances of parallel juxtaposed sections of the transverse thread, the distances between the parallel juxtaposed sections of the transverse thread outside of the jump zone then in itself are met again very accurately and are homogeneous.

This is in Fig. 3 shown again in detail.

In Fig. 3 In the region of a Querfadenablageschnecke 1, the first endless belt 30 can be seen above the yarn storage level and the second endless belt 31 below the yarn deposit level. These two endless belts 30, 31 clamp transverse thread loops 2 ' between them and transport them at a feed rate v ₁ to the left. In Fig. 3 this speed is perfectly matched to the feed velocity v ₀ of the transverse thread tray screw 1 v _1, ie, during the time it takes for the cross-thread tray screw 1 for one full rotation of 360 ° at a constant rotational speed, move the endless belts 30, 31 just by a distance d ₁ in the x direction, which corresponds to the pitch h of the thread of the Querfadenablageschnecke 1 .

In the longitudinal direction ( x- direction) of the yarn layer, a second auxiliary device for controlling the filing of the transverse thread loops is attached, which comprises an upper endless belt 40 and a lower endless belt 41 . The upper endless belt 40 in the second auxiliary device is aligned so as to overlap at least partially with the upper endless belt 30 in the first auxiliary device in the x- direction (feeding direction of the transverse thread-laying loops 2 ') while being slightly laterally in the y- direction (transverse yarn direction) offset (possibly inward - or as in Fig. 3 shown outward) is mounted relative to the thread tray plane.

Accordingly, the lower endless belt 41 in the second auxiliary device is aligned so that it overlaps in the x- direction (feed direction of the Querfadenablageschlaufen 2 ' ) at least partially with the lower endless belt 31 in the first auxiliary device, while in the y- direction (transverse thread direction) laterally slightly offset is attached to it.

The lateral offset of the upper 40 and the lower 41 endless belt in the y direction is selected so that the upper 40 and the lower endless belt 41 also get a part of a transverse thread loop 2 ' before this cross loop 2' of the pair of upper 30 and lower 31 endless belts in the first auxiliary device is released.

Thus, in the region of the overlap of the endless belts 30, 31 with the endless belts 40, 41, there is a controlled transfer of the transverse loop 2 ', which is enclosed between the upper 30 and the lower 31 endless belt in the first auxiliary device, to the upper 40 and the lower 41 endless belt in the second auxiliary device. Corresponding processes take place between the endless belts in which in the image extension in Fig. 2 right-hand right pair of endless belts of the first auxiliary device and the (not shown) "right" pair of endless belts of the second auxiliary device instead.

In Fig. 3 is shown again in detail how the speed v _2, with the upper 40 and lower 41 endless belt in the second auxiliary device in the feed direction of the transverse thread loops 2 'move is smaller than the speed v ₁ at which the upper 30 and the lower 31 endless belt in the first auxiliary device in the feed direction of the transverse thread loops 2 ' move. As a result, the laying distance (mesh size) d ₂ of in Fig. 3 Querfadenschlaufen 2 'placed on the left edge of the picture smaller than the laying distance (mesh size) d ₁ in Fig. 3 From the right fed transverse thread loops 2 ' .

It will be readily apparent to those skilled in the art that the in Fig. 2 and 3 shown principle, in addition to the first auxiliary device for controlling the filing of the Querfadenablageschnecken released Querfadenablageschlaufen ( 2 ' ) in the Fadenablageebene ( xy plane) another, in principle identical construction second auxiliary device to take over the transverse thread loops of the first auxiliary device, by a staggered Arrangement of further, arranged in series auxiliaries, can be expanded as desired.

With the device according to the invention with one or more auxiliary devices, it is possible to carry out in a targeted manner various methods for controlling a controlled transverse thread deposition in the production of suture layers. As a result, novel reticular scrims can be produced, which are characterized on the one hand by very high uniformity in the mesh tray image and on the other hand by the ability to provide targeted distance jumps the mesh size in the longitudinal direction of the continuously produced in a manufacturing process without changing the Querfadenablageschnecken scrim.

LIST OF REFERENCE NUMBERS

1

(Querfadenablage-) screw

1a

free end of a (Querfadenablage-) snail

2

transverse thread

2 '

Cross thread loop

3, 3a, 3b

longitudinal threads

4

Cross thread layer

5

rotor arm

H

Pitch of the (Querfadenablage-) screw

x, y, z

Directions of an orthogonal axbox

10

Device for producing net-like scrim

30,31,40,41

endless belts

301, 302, 303, 304

Guide rollers of the endless belt 30

311,312,313,314

Guide rollers of the endless belt 31

401, 402, 403, 404

Guide rollers of the endless belt 40

411, 412, 413, 414

Guide rollers of the endless belt 41

d ₁ , d ₂

Distances between sections of the transverse thread 2 laid down in parallel in the longitudinal direction x

v ₀ ; v ₁ ; v ₂

Feed rates of the transverse thread loops in the transverse thread laying screws; in the first auxiliary device; in the second auxiliary device

Claims (5)

1. A device (10) for producing net-like scrims with intersecting longitudinal threads (3, 3a, 3b) and cross threads (2) which define a first direction (longitudinal direction) and a second direction (transverse direction) extending transversely to the first direction and hence a thread deposition plane, the device (10) comprising:

   - at least one rotor arm (5) which comprises a cross thread deposition element (4) for depositing a cross thread (2) to be supplied in transverse direction,

   - means for depositing longitudinal threads (3, 3a, 3b) to be supplied in longitudinal direction,

   - two cross thread deposition worms (1) rotatably aligned in longitudinal direction with windings to receive cross thread loops (2') of a cross thread (2) supplied via the at least one rotor arm (5), wherein a rotation of a cross thread deposition worm (1) provides for a feed of cross thread loops (2') received in its windings in longitudinal direction towards a free end (1a) of this cross thread deposition worm (1) and there for a deposition of the cross thread loop (2) in the thread deposition plane,

   characterized in
   that in the region of one free end (1a) of each of the cross thread deposition worms (1) at least one auxiliary device is provided to control the deposition of the cross thread deposition loops (2') released by the cross thread deposition worms (1) in the thread deposition plane, said at least one auxiliary device comprising:

   two endless belt pairs each arranged in longitudinal direction of the thread deposition plane at its left and right edge, wherein per left and per right endless belt pair an upper (30) and an associated lower (31) endless belt each can be aligned relative to the thread laying plane such that the upper endless belt (30) can be guided from above the thread deposition plane and the lower endless belt (31) from below the thread deposition plane towards cross thread loops (2') of a cross thread (2) to be guided in the cross thread deposition worms (1) such that the cross thread loops (2) can be frictionally enclosed between the upper (30) and the lower (31) endless belt,

   wherein means are provided to drive the endless belts (30, 31) of each endless belt pair in the thread deposition plane in longitudinal direction, so that a cross thread deposition loop (2') enclosed between a pair of endless belts (30, 31) in the thread deposition plane can be moved on by the endless belts (30, 31) in longitudinal direction.
2. The device (10) for producing net-like scrims according to claim 1, which comprises a further auxiliary device identical in construction with the auxiliary device described in claim 1, wherein a left endless belt pair (40, 41) of the further auxiliary device is arranged to partly overlap in longitudinal direction a left endless belt pair (30, 31) of the auxiliary device described in claim 1 and a right endless belt pair of the further auxiliary device is arranged to partly overlap in a longitudinal direction a right endless belt pair of the auxiliary device described in claim 1 in order to receive a cross loop (2') to be enclosed between the endless belts (30, 31) of the first auxiliary device and to be transported in feed direction before release thereof in a manner controlled by the endless belts (40, 41) of the second auxiliary device.
3. A method for producing net-like scrims with longitudinal threads (3, 3a, 3b) and cross threads (2) intersecting at right angles, which define a first direction (longitudinal direction) and a second direction (transverse direction) extending transversely to the first direction and hence define a thread deposition plane, the method comprising the following steps:

   - supplying a cross thread (2) in transverse direction by means of at least one rotor arm (5) comprising a cross thread layer (4),

   - depositing longitudinal threads (3, 3a, 3b) in longitudinal direction,

   - receiving cross thread loops (2') of the cross thread (2) supplied via the cross thread layer (4) of the at least one rotor arm (5) by the windings of two cross thread deposition worms (1) rotatably aligned in longitudinal direction, wherein a rotation of a cross thread deposition worm (1) provides for a feed of cross thread loops (2') received in its windings in longitudinal direction towards a free end (1b) of this cross thread deposition worm (1) and there for depositing of the cross thread loop (2) in the thread deposition plane,

   characterized by
   providing at least one auxiliary device which serves to control the deposition of the cross thread deposition loops (2') released by the cross thread deposition worms (1) in the thread deposition plane in the region of a free end (1b) of the cross thread deposition worms (1), wherein this auxiliary device comprises two endless belt pairs each arranged in longitudinal direction of the thread deposition plane at the left and the right edge thereof, wherein per left and per right endless belt pair an upper (30) and an associated lower (31) endless belt each is aligned relative to the thread deposition plane such that the upper endless belt (30) is guided from above the thread deposition plane and the lower endless belt (31) from below the thread deposition plane each towards cross thread loops (2') of a cross thread (2) guided in the cross thread deposition worms (1), so that the cross thread loops (2') are frictionally enclosed between the upper (30) and the lower (31) endless belt,
   driving the endless belts (30, 31) of each endless belt pair in the thread deposition plane in longitudinal direction, so that a cross thread deposition loop (2') enclosed between a pair of endless belts (30, 31) in the thread deposition plane is moved on by the endless belts (30, 31) in feed direction of the cross thread loop transport.
4. The method according to claim 3, characterized in that there is provided a further auxiliary device identical in construction with the auxiliary device described in claim 3, wherein a left endless belt pair (40, 41) of the further auxiliary device is arranged to at partly overlap a left endless belt pair (30, 31) of the auxiliary device described in claim 3 and a right endless belt pair of the further auxiliary device is arranged to at partly overlap a right endless belt pair of the auxiliary device described in claim 3 in feed direction of the cross thread loops (2') in order to receive a cross loop (2') enclosed between the endless belts (30, 31) of the auxiliary device and transported in feed direction in a manner controlled by the endless belts (40, 41) of the further auxiliary device before release thereof.
5. The method according to claim 4, characterized in that

   - the cross thread deposition worms (1) transport cross thread loops (2') received in their windings at a speed v₀ in feed direction,

   - the endless belts (30, 31) in the first auxiliary device transport cross thread loops (2') received between the same at a speed v₁ in feed direction,

   - the endless belts (40, 41) in the further auxiliary device transport cross thread loops (2') received between the same at a speed v₂ in feed direction,

   wherein the following alternative relationships apply:

   a) v₀ = v₁ = v₂, or

   b) v₀ = V₁ and v₁ ≠ v₂, or

   c) v₀ ≠ v₁ and v₁ ≠ v₂.

Images