WO2020025411A1

WO2020025411A1 - Device for adjusting the warp tension of warp threads

Info

Publication number: WO2020025411A1
Application number: PCT/EP2019/069875
Authority: WO
Inventors: Mario Krupka; Andreas Rutz
Original assignee: Lindauer Dornier Gesellschaft Mit Beschränkter Haftung
Priority date: 2018-08-01
Filing date: 2019-07-24
Publication date: 2020-02-06
Also published as: DE102018212847B3

Abstract

The invention relates to a device (1) for adjusting the warp tension of warp threads (K), particularly strip-type warp threads, by deflection, wherein the device (1) is designed to be arranged between a creel with winding heads for warp threads (K) and a weaving device. The device according to the invention is characterised in that the device (1) comprises at least a first deflection means (10) and a second deflection means (20) which are successively arranged in the warp direction (KR), each one extending over the width of the fabric and each one comprising at least one elongate body (11a, 11b; 21a, 21b) having at least one respective running surface (18a, 18b, 28a, 28b) for the warp threads (K), wherein the respective position of each at least one running surface (18a, 18b, 28a, 28b) is variable by rotation about a respective axis of rotation (12, 22) and can be locked in position in the different positions, wherein each at least one running surface (18a, 18b, 28a, 28b) is not rotationally symmetrical to said axis of rotation (12, 22) and wherein said different positions generate different wrap angles (α1, β1) for the warp threads (K) guided over each running surface (18a, 8b, 28a, 28b).

Description

Device for adjusting the warp tension of warp threads

The invention relates to a device for adjusting the warp tension of warp threads, in particular ribbon-shaped warp threads, by deflection, the device being designed to be arranged between a creel with bobbins for warp threads and a weaving device.

In general, in order to obtain an optimal fabric, the aim is to have a sufficiently high warp tension on the one hand to maintain firm bonds when the sheet is attached and to prevent loose threads from becoming jammed at any time. On the other hand, however, yarn-specific maximum values must not be exceeded in order to avoid warp thread breaks. The

Warp tension not only determines the fabric and weave quality, but also the realizable weaving machine speed. To the various influences on the warp tension curve (cyclical influences due to change of subject and blade stop; temporary influences such as

Relaxation effects when the weaving machine is at a standstill and starts up;

Various devices have become known for reducing or even compensating for continuous influences (such as the running of the warp beam).

For example, as is known, a match tree is used in weaving machines, which is arranged in front of the weaving device, and the fluctuating tension of the warp threads, in particular due to the shedding

is caused to reduce or compensate. Without such compensation, there would be frequent tearing or damage to the warp threads. It is therefore desirable that the warp tension in the weaving process be constant in both its length and its width. A relatively simple, for example known from DE 33 46 030 A1 arrangement for voltage compensation is a sprung match tree, which, however, due to its relatively large mass, is unable to move quickly Compensate for changes in voltage. Also known, for example from WO 2018/041592 A1, is the use of a spring plate which extends over the warp width and over which the warp threads are guided and the spring plate is supported on an elastic hose filled with compressed air.

A braking device for warp threads is known from DE 834 377 B1, in which two rollers are provided, over which the warp threads are guided in an S-shape. When the shed is opened, these rollers stand still, which means that the warp threads are braked by sliding on the rollers. However, if the warp threads run back when the shed is closed, the rollers can be rotated. In addition, the rollers are mounted in a common holder such that the wrap angle for the S-shaped warp threads guided over the rollers can be regulated by rotating or pivoting the two rollers about a common axis of rotation. This configuration facilitates the tension control of the warp threads or the control of the braking effect. Especially in the case of ribbon or tape-shaped warp threads,

For example carbon tapes, their tension must be set exactly. Tapes are usually drawn off from a tape gate in which there are a large number of winding units, each with wound tape. These winding units are each centrally via a

Slipping clutch braked. As the diameter of the bobbins decreases, the warp tension also decreases due to the principle. A uniform increase in warp tension would increase the differences in warp tension between the different coils. A uniform warp tension is essential for a fabric that is homogeneous across the weaving width. There is a need to create a device according to the preamble of claim 1, which equalizes the warp tension over the fabric width and great flexibility in adjusting the Warp tension, including adjusting the warp tension over a relatively wide range of forces.

This object is solved by the features of claim 1. The device according to the invention has at least two first and second deflection means arranged one behind the other in the warp direction. In this case, more than two deflecting means can also be provided. The at least two deflecting means both extend over the width of the fabric and each have at least one elongate body with at least one running surface for the warp threads. According to the invention, the positions of the at least one tread of the respective at least one elongate body of each deflecting means in space can be changed by rotating this tread and can be locked in place in the different positions. Said at least one running surface of the at least first and second deflecting means is not rotationally symmetrical to the axis of rotation of the respective running surface. Thus, for those over the

Running warp threads in said different

Positions of the deflecting means realized different wrap angles and the warp threads braked differently in this way. Thus, an operator, in particular taking into account the warp thread material to be woven, can adjust the braking of the warp threads on the deflection means according to the requirements. This allows for different items and / or fluctuating with time

Warp tension the barrel length contacting the warp threads along the said running surfaces are adjusted in order to adjust the warp tension as required.

The device according to the invention is particularly suitable for warp threads that are band-shaped or tape-shaped, for example for carbon tapes. By means of the invention, the frictional force for all warp threads and thus a uniform warp tension over the width of the fabric can be adjusted in a controlled manner. According to a particularly preferred embodiment, the said axes of rotation of the running surfaces of the respective elongated bodies of the first or second deflecting means coincide with the axes of rotation of the respective deflecting means themselves. In this case, the deflection means are each themselves rotatably supported about said axes of rotation, which extend in the weft direction and are preferably spaced apart in the warp direction. Both deflecting means can take up at least two different, fixedly positionable angular positions. The running surfaces of the respective elongated bodies of the at least two deflecting means for the warp threads are not rotationally symmetrical in relation to the respective axis of rotation of the associated deflecting means in accordance with the above. The consequence of this is that, depending on the respectively set angle of rotation of the at least two deflecting means, different wrap angles result for the warp threads. This configuration has the advantage that by simply rotating and locking the deflecting means

The wrap angle for the warp threads can be changed quickly and easily in order to change the warp tension of the warp threads accordingly.

A further development in this regard advantageously provides that the at least two deflecting means can preferably be positioned in a stationary manner in any number of rotational angle positions. In this way, very fine gradations with regard to the warp tension can be carried out

Adjust the change in the wrap angle.

An advantageous embodiment is characterized in that at least one of the at least two deflecting means comprises at least two elongate bodies which extend in the weft direction and are designed as rods. These rod-shaped elongated bodies, which preferably, but not necessarily, have a round cross section and are stationary relative to one another, are preferably opposite one another with respect to the axis of rotation of the associated deflecting means and each have one convex tread for the warp threads. In this case, the longitudinal axes of the elongate bodies formed at least as rods and the said axis of rotation of the deflecting means preferably lie in a common plane. By simple rotation around the axis of rotation of the person concerned

Deflection means the wrap angle of the warp threads on said at least two rod-shaped elongate bodies can be adjusted.

Said rod-shaped elongate bodies are preferably mounted so as to be freely rotatable about their respective longitudinal axes running in the weft direction, so that they act like rollers. With this configuration, none occurs

Friction between their surface and the warp threads. Only the elastic deformation work in the deflection thus acts on the warp threads. This solution is particularly suitable if the warp threads are designed as relatively rigid tapes. In addition, the surface is protected from more sensitive tapes in said embodiment. The said

Designing the rod-shaped elongated bodies as rollers means that the running surfaces, that is to say the contact surfaces with the warp threads, change constantly, even though they always remain the same size.

In a development of the invention, the elongate bodies designed as rods are arranged in such a way that the individual warp threads, depending on the setting of the angle of rotation of the at least one deflecting means, are only in contact with one elongate body or with the at least two elongate bodies. A contact with only one elongated body usually causes - depending on the or the

Wrap angles - a lower mechanical load for the respective warp thread.

According to an advantageous embodiment, at least one of the at least two deflecting means comprises one over the width of the fabric

extending elongate body with a non-round convex, preferably oval and preferably constant in the weft direction, cross section, wherein at least one tread is provided on the surface of said elongated body. For example, the cross section of such an elongated body can be elliptical.

A related development of the invention provides that the

The longitudinal axis of said elongated body coincides with the axis of rotation of the associated deflecting means. That way they are

Handling and also the locking in the respectively desired position of the deflecting means in question are simplified.

According to an advantageous embodiment, which is alternative to the rotatable configuration, at least one of the deflecting means has two convex ones

Running surfaces that can be positioned towards and away from each other. This positionability is realized, for example, by mounting these treads on the end face in corresponding sliding bearings of the deflecting means in question. By preferably linearly shifting one or both running surfaces, their relative distance from one another and thus the wrap angle for the warp threads can be set.

Advantageously, the at least one tread of the respective at least one elongate body of the first and / or the second deflection means has a cross section that changes over its length. In this way, tensions of warp threads running side by side in the weft direction can be compensated. The uniformity of the resulting fabric can be increased in this way, since in particular sagging of the warp threads in the fabric, in particular in the case of tape-like or tape-like warp threads, can be avoided by a suitable tension adjustment of the warp threads before entering the weaving device. The possibilities for adjusting the positions of the at least two deflection means are advantageously expanded in that at least one of the at least two deflection means, preferably the two of the at least two deflection means, is adjustably mounted in the warp direction.

Alternatively or - which is preferred - at least one of the at least two deflecting means, preferably both deflecting means, is adjustably mounted perpendicular to the weft and perpendicular to the warp direction. If the warp direction is, for example, the x direction and the weft direction is the y direction, at least one of the deflection means is one

Movement component designed to be displaceable in the z direction.

If an adjustment in the warp direction and / or perpendicular to the warp and weft direction is mentioned beforehand, this should also apply

Angular components in the corresponding respective direction can be included. So if an adjustability is possible in one direction, for example, that an angle between 0 ° and 90 ° with respect to the warp and

If the weft direction is perpendicular, then it is adjustable at least with an angular component perpendicular to the warp and

Given direction of fire. If the said direction is also inclined at an angle between 0 ° and 90 ° in the warp direction, it is also possible to adjust it with an angular component in the warp direction.

The adjustment units required for the adjustment can be designed to be operated manually or by a motor. In a simple embodiment, an adjustment unit comprises, for example, a clamping lever for releasing and locking the associated deflecting means and a guide in which the deflecting means can be guided, for example linearly, and in

different positions can be locked.

In both of the above cases, the fixed lockability is the

Adjustment units must be provided so that the warp threads do not move the deflection means out of their position in the room. In one embodiment, at least one of the at least two deflecting means, preferably both deflecting means, is arranged in linear bearings so as to be linearly displaceable. In this case, a common, continuous slide bearing can be provided for the at least two deflecting means in which they are guided. This simplifies the manufacture and handling for positioning the deflecting means. The plain bearings are part of the adjustment units mentioned above.

A simple handling with a high degree of automation benefits if at least one of the deflection means can be adjusted in the said angular positions and / or in their position in the warp direction and / or in their position perpendicular to the weft and warp direction by means of control or adjustable adjustment units. To this end, the

Adjustment units Adjustment elements in the form of motors that act purely in rotation and / or interact with linear units, and / or

pneumatic actuators. By controlling the motors or

Pneumatic actuators can position the or the

Deflection means are changed. By switching off, for example, a corresponding motor, the locking of the deflection means or means is also ensured in the case of a permanent motor coupling.

At least one tension measuring device is preferably provided for measuring the tension of the warp threads. The

Tension measuring device is connected to an evaluation unit, whereby on the basis of the measurement results

Tension measuring device control commands from an electrical

Control are output to the adjustment units. It is thus possible in a simple manner by monitoring the tension of the warp threads to readjust the warp thread tension by changing the position of one or more deflecting means. It is advantageous to subdivide at least one of the deflection means into at least two partial deflection means which are spaced apart in the warp direction and offset in the weft direction. Here, each of the partial deflecting means has at least one said elongated body, each with at least one running surface for the warp threads. By individually rotating each of the running surfaces about the respectively assigned axis of rotation, the warp tension of the different warp threads can be adjusted very flexibly by individual adjustment to their current arrangement and configuration, in order in particular to achieve an optimal tension compensation.

For example, warp thread areas with different warp tensions can be fed to the shedding means with such an embodiment. Jointly funded warp threads with different

Materials are taken into account, for example those with

different coefficients of friction. The subdivision basically serves to increase, reduce, compensate for, and in principle vary the tensions in the different warp thread areas running side by side in the weft direction.

In addition, the distance between the two can preferably also be set

Partial deflection in the warp direction to each other and / or their respective

Set height position. Furthermore, it can alternatively or additionally be provided that said at least two running surfaces of the two elongate bodies of the at least two partial deflecting means have different cross sections, wherein these cross sections can be constant or vary in the weft direction. Here are various

Constellations possible. The cross sections of said at least two running surfaces can also be circular, for example, but have different diameters. In the event that some of the warp threads are guided over a running surface and another part of the warp threads over another running surface of each deflecting means, the at least two deflecting means are preferably of this type formed and positionable that the running lengths of all warp threads and advantageously also the contact length of the warp threads with the respective running surfaces of the deflecting means and / or the sum of the wrap angles of all warp threads around all deflecting means are essentially the same overall. This prevents warp threads due to

paths of different lengths between warp beam or creel to the weaving device or due to different friction have a greater or smaller warp tension than other warp threads.

The use of a device as described above is also part of the invention, this device being used for deflecting ribbon-shaped warp threads, in particular carbon tapes.

Furthermore, the invention relates to a weaving machine, in particular for tape weaving, the weaving machine having a known weaving device

Compartmental means and weft insertion means, wherein the

The device according to the invention is connected upstream of the weaving device.

The invention is explained in more detail below with reference to figures. The same reference numerals are used for the same or equivalent or equivalent elements. Furthermore, not all elements are provided with reference numerals in all figures; if like elements in

different figures are shown, in some figures the same reference numerals have not been used again in order to maintain clarity. Show it:

Figure 1 is a schematic side view of a first embodiment of a device according to the invention with two deflecting means, each with two treads, which are in a first position.

Fig. 2 shows the device of Fig. 1, in which the two deflection means in

are in a second position; 3 shows the device of FIGS. 1 and 2, in which the two deflecting means are in a third position;

Fig. 4 shows the device of FIGS. 1 to 3 in plan view with the two

Deflecting means in vertical position (as in Fig. 1);

Fig. 5 shows the device of Figs. 1 to 3 in plan view with the two

Deflecting means in a horizontal position (as in Fig. 2);

6 shows a schematic side view of a device as in FIGS.

1 -5 with motors for adjusting the deflection means;

7 shows a schematic side view of a device as in FIGS.

1 -5 with motors and pneumatic actuators for adjusting the deflection means; 8 shows a schematic side view of a weaving machine with a device according to the invention;

9 shows a schematic side view of a second embodiment of a device according to the invention with two deflecting means, each with a running surface, which are in a first position;

FIG. 10 shows the device of FIG. 9, in which the two deflecting means are in a second position;

Figure 1 1 is a plan view of an elongated body of a deflecting means with a cross section changing over its length. 12 is a plan view of an elongate body of a deflecting means with an alternative cross-section which changes over its length, and

Fig. 13 is a plan view of a device similar to FIGS. 4 and 5, with a segmentation of one of the deflection means.

A first embodiment of a device 1 according to the invention for adjusting the warp tension of warp threads K is shown in FIGS. 1 to 3 in a schematic side view and in FIGS. 4 and 5 in a top view. According to FIGS. 1 -5, the device 1 has a first and a second deflecting means 10 and 20, which are identical in the present case and over which warp threads K are guided in the warp direction KR. A large number of warp threads K running side by side are guided from a creel (see FIG. 8) with a corresponding large number of winding positions to the device 1 via a rotatably mounted deflection roller 4. The deflection roller 4 is in this case mounted in a bearing block 5 which is arranged on a vertical support device 3. After passing through the device 1, the warp threads K are passed into a weaving device (see also FIG. 8) via a deflection roller 6 rotatably mounted in a bearing block 7.

The two deflection means 10, 20 are on a horizontal

Support device 2 arranged and each include two identical, formed as rods elongated body 11 a, 11 b and 21 a, 21 b, which have a circular cross section and are rotatably mounted about a common axis of rotation 12 and 22. For this purpose, as can be seen in FIGS. 4 and 5, the respective end faces of the elongated bodies 11 a, 11 b and 21 a, 21 b are coupled to one another via a connecting piece 13 and 23, respectively, the connecting pieces 13 and 23 one each

Have pivot pins 14 and 24, which are mounted in only indicated pivot bearings 15 and 25, respectively. The pivot bearings 15, 25 are additionally guided in vertical guides 30, with which the height position of the respective deflecting means 10, 20 can be changed, ie the position of the deflecting means 10, 20 perpendicular to the

Weft direction SR and perpendicular to the warp direction KR (see double arrows f3 and f4 in FIGS. 1-3). The vertical guides 30 are in turn mounted on the underside in horizontal guides 31 designed as slide bearings, which are provided on the horizontal support device 2. The deflection means 10, 20 can thus also be shifted in the warp direction KR (see FIG.

Double arrows f5 and f6).

With the help of the vertical guides 30, the horizontal guides 31 and the rotation about the respective axis of rotation 12 and 22, the deflection means 10, 20 can be transferred to the most varied positions and locked there. 1 and 4 are the elongated bodies 11 a, 11 b of the first deflecting means 10 and the elongated bodies 21 a, 21 b of the second

Deflection means 20 are each positioned one above the other, while the elongated bodies 11 a, 11 b and the elongated bodies 21 a, 21 b according to FIGS. 2 and 5 are each positioned horizontally next to one another. Furthermore, the two deflecting means 10, 20 or their axes of rotation 12, 22 are more closely spaced in the setting according to FIG. 1 than in the setting according to FIG. 2 in that the deflecting means 10, 20 have been positioned closer to one another in the horizontal guides 31 , 3 shows how the two deflecting means 10, 20 face each other in an inclined position. The two axes of rotation 12, 22 are also locked at different heights.

Each rod-shaped elongated body 11 a, 11 b of the first deflecting means 10 and each rod-shaped elongated body 21 a, 21 b of the second

Deflection means 20 has a running surface 18a, 18b or 28a, 28b with a convex arcuate course, over which the warp threads K are guided. The respective elongated bodies of the two deflecting means thus point 10, 20 each have two treads 18a, 18b and 28a, 28b. Neither of these are rotationally symmetrical with respect to the axis of rotation 12, 22 of the respective deflecting means 10, 20. The axes of rotation 12, 22 of the deflecting means 10, 20 are the only axes of rotation that are used in the respective deflecting means 10 or

20 are provided. A rotation about the axis 12 or 22 therefore requires a rotation of the corresponding running surfaces 18a, 18b or 28a, 28b. The wrap angles a1, a2 or β1, β2, which form the warp threads K, each with a running surface 18a, 18b or 28a, 28b, are shown in FIGS. 1-3. If there is only one contact per deflecting means 10, 20, the designation a1 or .beta.1 is chosen for the respective wrap angle.

As can be seen from FIGS. 1-3, the sum of the wrap angles a1, a2, β1 and β2 differs depending on the setting of the deflection means 10, 20 and thus the setting of the contact surfaces 18a, 18b, 28a and 28b. The wrap angles a1, a2, β1 and β2 determine the braking of the warp threads K and thus have a direct influence on the tension of the warp threads K.

The elongated bodies 11a, 11b and 21a, 21b, which are designed as rods, are preferably freely rotatable about their respective longitudinal axes, so that they act as rollers and are caused solely by the friction of the friction on their respective running surfaces 18a, 18b, 28a , 28b rotate guided warp threads K.

FIG. 6 shows the device 1 according to FIGS. 1 -5, adjustment units 40, 41, 42 shown schematically for the first deflection means 10 and adjustment units 45, 46, 47 for the second deflection means 20 being additionally provided. The adjustment units 40 and 45 each comprise a motor M1.1 or M2.1, which is set up for rotating the first deflection means 10 or the second deflection means 20 about the axis of rotation 12 or the axis of rotation 22 (see arrows fl or . f2). The adjustment units 41 and 46 each include a motor M1.2 or M2.2, which for the

Height positioning (perpendicular to the warp and weft direction KR, SR) of the first deflecting means 10 and the second deflecting means 20 is set up in the respective vertical guides 30 (see arrows f3 and f4). The

Adjustment units 42 and 47 each comprise a motor M1.3 or M2.3, which is set up for the longitudinal positioning (in the warp direction KR) of the first deflection means 10 or the second deflection means 20 in the respective horizontal guides 31 (see arrows f5 and . f6). The correspondingly required mechanical means, for example flanges, pinions, racks (for the linear guides), possibly gears, etc. are the present

For the sake of clarity, not shown, but symbolized by dotted, rounded rectangles.

In the alternative embodiment shown in FIG. 7, the two adjusting units 40, 45 are again provided with the motors M1.1 and M2.1 provided for the rotary movement of the deflection means 10 and 20, respectively. For the linear guidance of the first deflecting means 10 perpendicular to the warp and weft directions KR, SR and in the warp direction KR (in the vertical guides 30 and the horizontal guides 31), on the other hand, the adjusting units 41, 42 are equipped with pneumatic actuators 43 and 44 in the present case. For the linear guidance of the second deflection means 20 perpendicular to the warp and weft direction KR, SR and in the warp direction KR (in the

Vertical guides 30 and the horizontal guides 31) comprise the

Adjustment units 46, 47 pneumatic actuators 48 and 49.

The possibility of controlling or regulating the adjustment units 40, 41, 42, 45, 46, 47 is discussed below.

8 shows a schematic overall structure of a weaving machine 50. Warp threads K are fed from a creel 51 with a large number of winding units 52 (only two winding units 52 are shown for the sake of clarity) via two deflection rollers 53, 4 in the warp direction KR Device 1 according to the invention (alternatively: device 101, see FIGS. 9 and 10) and from there it is transported via the deflection roller 6 into a weaving device 54. The weaving device 54 comprises shed forming means 55, which are designed, for example, in the form of oscillating and oppositely movable strands in order to form the shed 56. The weaving device 54 further comprises weft insertion means 57, which can be designed as a thread gripper. Alternatively, the weft insertion is carried out using air nozzles, water or shooters. In addition, the

Weaving device 54 has a reed 58, by means of which an inserted weft thread can be attached to the binding point 59 of the fabric G that has already been created. Other devices for tying the weft thread are readily possible, for example one

Return movement of the fabric G towards the last weft thread. The finished fabric G is then drawn off by means of a goods take-off device 60, which is designed here as a take-off roller, and is wound onto a goods tree 62. Several deflection and pressure rollers 61 are arranged in the area of the goods take-off device 60 or the goods tree 62. As an alternative to a fabric tree 62, the fabric G can be wound up, for example, on a riser winder. It is also possible that the fabric G is not wound up, but is pulled off horizontally; this method is preferably used for 3D fabrics. The loom 50 according to the exemplary embodiment in FIG. 8 has a central electronic control 65 which controls two drives 66 and 67. The drive 66, which can also be designed as a main drive, in the present case drives the shedding means 55, the thread grippers 57 and the reed 58. The drive 67 controls accordingly

Embodiment the goods take-off device 60 and the goods tree 62. Other drive concepts are possible without further ado. Sensor data can also be evaluated by means of an evaluation unit 68, which can be provided, for example, within the control 65. In the present case, a tension measurement device 69 is arranged between the device 1 according to the invention and the shedding means 55, which measures the tension in summary over all the warp threads K running next to one another and the corresponding measurement signals to the

Passes on evaluation unit 68. The tension measuring device 69 can, for example, be integrated in a match tree (not shown). The evaluated measurement signals are then used in the present case by the controller 65, the corresponding adjustment units (cf. FIGS. 6, 7) of the

Control deflecting means 10, 20 and the deflecting means 10, 20

to position accordingly. The adjustment units can

Servomotors M1.1, M1.2, M1.3, M2.1, M2.2, M2.3 (rotary or with linear units, see Fig. 6), pneumatic actuators (see Fig. 7) or any other Have type of suitable adjusting elements. The adjusting members can have position feedback devices (not shown) which - for example after evaluation in the evaluation unit 68 - can be used for faster regulation of the said positions.

FIGS. 9 and 10 show a second embodiment of the device according to the invention, in which two deflecting means 110, 120, which are arranged one behind the other in the warp direction KR and which extend over the width of the fabric, are also provided. Both deflection means 110, 120 have elongated bodies 111 and 121 with an oval cross section that is constant in the weft direction, both elongated bodies 111, 121 each having a running surface 118 and 128, over which the warp threads K are guided. In the present case, it is possible for the deflection means 110, 120 to be rotated about their respective axes of rotation 112 and 122 in such a way that the

opposite outer surfaces of the respective elongated body 111, 121 serve as treads. The sum of the individual wrap angles a1 and β1 is smaller in the settings according to FIG. 9 than in the settings according to FIG. 10. On the one hand, the respective rotation of the two deflection means 110, 120 about their respective axis of rotation 112 contributes to the amount of the respective wrap angles , 122 and on the other hand the positioning in the z direction, ie perpendicular to the warp direction KR and perpendicular to the weft direction SR. In the present case, the deflection means 110, 120 are at the same position in the warp direction KR in the settings according to FIG. 9 and FIG. 10.

The device 101 according to FIGS. 9 and 10 can also be easily integrated into a weaving machine, as shown in FIG. 8 and described above.

In all figures it is shown that the warp threads K around the first

Deflection means 10, 110 are guided from above and around the other deflection means 20, 120 from below. However, it is easily possible that the warp threads K are also initially around the first deflecting means 10, 110 and

then be guided from above around the second deflecting means 20, 120. According to an alternative, adjacent warp threads K are guided alternately from below and from above around the deflection means 10, 20 or 110, 120, which can increase the stability of the device 1. It is also conceivable that one or more groups of adjacent warp threads are first led from below (above) and another or more other groups of adjacent warp threads K from above (below) around the deflection means 10, 20 or 110, 120.

Only two deflecting means 10, 20 and 110, 120 are shown in the figures. It is easily possible that more than two

Deflection means are provided which also have adjustable treads. 11 and 12 show different designs of an elongate body 211 or 311 of a first and / or second deflection means, the cross section of which changes over the length of the respective elongate body 211 or 311. The two elongated bodies 211, 311 are rotationally symmetrical in the present case. According to the

Embodiment of FIG. 11, the elongated body 211 has a concave tread 218, while according to the embodiment of FIG. 12, the elongated body 311 has a tread 318 which is convex in a central region and slightly concave in both end regions

is trained. Through the respective configurations, the

Adjust the warp tension of (indirectly and / or directly) side by side over the running surface 218 or 318 of the warp threads or compensate for unwanted differences in the warp tensions. In the elongated body 211 of FIG. 11, for example, the warp tension of warp threads guided further outside is greater than in the case of warp threads guided in the center. As is not difficult to recognize for a person skilled in the art, a large number of different cross sections which vary over the length of an elongated body are possible.

13 is a plan view (see FIG. 5) of a subdivision or

Segmentation of a first deflecting means 10 into two partial deflecting means 10 'and 10 "is shown, the two partial deflecting means 10", 10 "in

Warp direction KR are spaced and offset from each other in the weft direction. In the present case, each partial deflecting means 10 ″, 10 “comprises two elongated bodies 11 a ″, 11 b ″ or 11 a“, 11 b ”each with two treads 18a ″, 18b ″ or 18a“, 18b ”; a different number of partial deflection means (for example three or four) and / or elongated bodies (per partial deflection means) and / or running surfaces (per elongated body) is readily possible. In the present case, the cross sections of the partial deflecting means 10 ″, 10 ″ are again circular, but other cross sections are also readily possible. By dividing a deflecting means, here the first deflecting means 10, the flexibility with regard to the setting of the warp tensions can

different warp threads K can be increased by a group of Warp threads K are guided over one partial deflecting means 10 ′ and another group of warp threads K over the other partial deflecting means 10 ″ and these different groups of warp threads K each other

Take the wrap angle with the respective treads 18a ', 18b' or 18a ", 18b". These different groups of warp threads can for example be made of different materials with different ones

Coefficients of friction exist. It can also be generally intended that one group of warp threads is subjected to a higher warp tension than the other.

For all of these purposes - as with the aforementioned

Embodiments - the running surfaces 18a ″, 18b ″ or 18a “, 18b” can be rotated about the respectively associated axes of rotation 12 ″ or 12 “and can be locked in place after the rotation. It is preferred if one or more additional adjustment options are provided, for example the distance between the two partial deflection means in the warp direction and / or a different height positioning. It should also be mentioned that the second deflection means 20 can also be segmented into a plurality of partial deflection means (not shown).

It should be noted that it is easily possible to combine the elongated bodies, which are shown by way of example in FIGS. 1-13, in a wide variety of ways in order to implement first and / or second deflection means (or third, fourth, ...).

The invention is used with particular advantage when feeding so-called tapes, that is to say ribbon-shaped warp threads made in particular of carbon, to a tape weaving machine. Here is the requirement that

to guide and brake fully impregnated tapes between the winding unit in the creel until they are fed into the tape loom with high rigidity. As explained above, the wrap angle of the tapes on the deflecting means can be adjusted by the invention, the wrap angle Any friction that occurs between the tape and the deflecting material burns and tensions the tape, so that tension-controlled drawing into the weaving device is possible.

LIST OF REFERENCES

1 device for adjusting the warp tension

2 horizontal supports

3 vertical support device

4 pulley

5 bearing block

6 pulley

7 bearing block

10 first deflecting means

10 'partial deflecting means

10 “partial deflection

11 a, 11 b elongated body

11 a ', 11 b' elongated body

11 a ", 11 b" elongated body

12 axis of rotation

13 connector

14 journals

15 pivot bearings

18a, 18b treads

18a ', 18b' treads

18a “, 18b“ treads

20 second deflecting means

21 a, 21 b elongated body

22 axis of rotation

23 connector

24 journals

25 pivot bearings

28a, 28b treads

30 vertical guidance

31 Horizontal guidance

40-42 adjustment units

43.44 pneumatic actuators

45-47 adjustment units

48.49 pneumatic actuators

50 weaving machine

51 gates

52 winding units

53 pulley

54 weaving setup

55 training resources

56 shed

57 weft insertion means

58 reed

59 tie point

60 goods take-off device 61 deflection and pressure rollers

62 goods tree

65 electronic control

66 drive

67 drive

68 evaluation unit

69 tension measuring device 101 device

110 first deflecting means

1 1 1 elongated body

1 12 axis of rotation

118 tread

120 second deflecting means

121 elongated body

122 axis of rotation

128 tread

21 1 elongated body

218 tread

311 elongated body

318 tread

K warp threads

G tissue

KR warp direction

SR shot direction

f1-f6 directions

aΐ, a2, ß 1, ß2 wrap angle

M1.1, M1.2, M1.3 motors

M2.1, M2.2, M2.3 motors

Claims

Patent claims

1. Device (1; 101) for adjusting the warp tension of warp threads (K), in particular ribbon-shaped warp threads, by deflection, the device (1; 101) being designed to be arranged between a creel (51) with bobbins (52) for warp threads (K) and a weaving device (54),

characterized in that the device (1; 101) has at least a first deflection means (10; 110) and a second deflection means (20;

120), which are arranged one behind the other in the warp direction (KR), each extend over the fabric width and each have at least one elongated body (11 a, 11 b; 21 a, 21 b; 111, 121; 211; 311) with at least each have a running surface (18a, 18b, 28a, 28b; 118, 128; 218; 318) for the warp threads (K), the respective position of the at least one running surface (18a, 18b, 28a, 28b; 118,

128; 218; 318) can be changed in position by rotating about a respective axis of rotation (12, 22; 112, 122) and in the different

Positions can be locked in place, the respective at least one running surface (18a, 18b, 28a, 28b; 118, 128; 218; 318) not

is rotationally symmetrical to said axis of rotation (12, 22; 112, 122) and wherein said different positions have different wrap angles (al, a2, ßl, ß2) for the respective one

Tread (18a, 18b, 28a, 28b; 118, 128; 218; 318) guided

Condition warp threads (K).

2. Device (1; 101) according to claim 1, characterized in that said axes of rotation (12, 22; 112, 122) for the respective

at least one tread (18a, 18b, 28a, 28b; 118, 128; 218; 318) each with one extending in the weft direction (SR)

The axis of rotation (12, 22; 112, 122) of the first and second deflection means (10, 20) coincide, the two axes of rotation (12, 22; 112, 122) are spaced from one another, the first and second deflection means (10, 20; 110, 120) each having at least two

can assume different, fixedly positionable rotational angle positions, and depending on the respectively set one

Angle of rotation of the at least two deflecting means (10, 20; 110, 120) each have different wrap angles (al, a2, ßl, ß2) for the warp threads (K) around the respective said at least one running surface (18a, 18b, 28a, 28b; 118, 128; 218; 318) result.

3. Device (1; 101) according to claim 1 or 2, characterized

characterized in that the at least two deflecting means (10, 20; 110, 120) can preferably be positioned in a continuously variable manner in any number of angular positions.

4. Device (1; 101) according to at least one of the preceding

Claims, characterized in that at least one of the at least two deflecting means (10, 20) comprises at least two elongate bodies (11 a, 11 b, 21 a, 21 b) which extend in the weft direction and are designed as rods and which are in relation to the Axis of rotation (12, 22) of the associated deflection means (10, 20) is preferred

opposite, preferably extend parallel to each other and each have a convex running surface (18a, 18b, 28a, 28b) for the warp threads (K).

5. The device (1; 101) according to the preceding claim, characterized in that the elongated bodies (11 a, 11 b, 21 a, 21 b) are mounted so as to be freely rotatable about their longitudinal axes running in the weft direction (SR).

6. Device (1; 101) according to at least one of the two

preceding claims, characterized in that depending on the setting of the angle of rotation of the at least one deflection means (10, 20) individual warp threads (K) only have contact with an elongated body (11 a; 21 a) or with the at least two elongated bodies (11 a, 11 b; 21 a, 21 b).

7. Device (1; 101) according to at least one of the preceding

Claims, characterized in that at least one of the at least two deflecting means (110, 120) overlaps one another

Fabric-wide elongated body (111, 121) with a non-round convex, preferably oval and preferably in

Shot direction (SR) constant, cross section, wherein the at least one tread (118, 128) of the relevant

Deflection means (110, 120) are provided on the surface of said elongate body (111, 121).

8. The device (1; 101) according to at least one of the preceding

Claims, characterized in that the at least one running surface (218; 318) of the respective at least one elongate body (211; 311) of the first and / or the second deflecting means (10, 20; 110, 120) changes over its length

Has cross section.

9. The device (1; 101) according to at least one of the preceding claims, characterized in that at least one of the at least two deflection means (10, 20; 110, 120), preferably the at least two deflection means (10, 20; 110, 120), are adjustable in the warp direction and can be locked in place in the different positions.

10. The device (1; 101) according to at least one of the preceding claims, characterized in that at least one of the at least two deflection means (10, 20; 110, 120), preferably both deflection means (10, 20; 110, 120), both vertically to shot- as is also adjustable in relation to the warp direction (SR, KR) and can be locked in place in the different positions.

11. The device (1; 101) according to at least one of the preceding claims, characterized in that at least one of the at least two deflection means (10, 20; 110, 120), preferably both deflection means (10, 20; 110, 120), in the Said angular positions and / or in their position in the warp direction (KR) and / or in their position perpendicular to the weft and warp direction (SR, KR) adjustable by means of control or adjustable adjustment units (40, 41, 42, 45, 46, 47) is.

12. The device (1; 101) according to the preceding claim, characterized in that at least one

Tension measuring device (69) for measuring the tension of the warp threads (K) is provided, the

Tension measuring device (69) is connected to an evaluation unit (68), wherein on the basis of the measurement results

Tension measuring device (69) control commands from a

electrical control to the adjustment units (40, 41, 42, 45, 46,

47) can be output.

13. Device (1; 101) according to at least one of the two

preceding claims, characterized in that the adjusting units (40, 41, 42, 45, 46, 47) adjusting members in the form of

Motors (M1.1, M1.2, M1.3, M2.1, M2.2, M2.3), rotary and / or with linear units, and / or pneumatic actuators (43, 44, 48, 49).

14. Device (1; 101) according to at least one of the preceding

Claims, characterized in that at least one of the deflection means (10) in at least two, in the warp direction (KR) spaced and in the weft direction offset partial deflection means (10 ', 10 ") is divided, each of the

Partial deflection means (10 ″, 10 “) at least one said elongated body (1 1 a ″, 1 1 b ″; 1 1 a“, 1 1 b “) with at least one each

Has running surface (18a ', 18b', 18a ", 18b") for the warp threads (K).

15. The device (1; 101) according to at least one of the preceding claims, characterized in that the at least two deflecting means (10, 20; 1 10, 120) are designed and can be positioned such that when part of the warp threads (K) are along a running path over several running surfaces (18a, 18b, 28a, 28b; 1 18, 128; 218; 318) and another part of the warp threads (K) along another

Runway over other running surfaces (18a, 18b, 28a, 28b; 1 18, 128; 218; 318) are guided, the running lengths of all warp threads (K) and advantageously also the contact length of the warp threads (K) with the

Treads (18a, 18b, 28a, 28b; 1 18, 128; 218; 318; 418) of the deflecting means (10, 20; 1 10, 120) and / or the wrap angle (al, a2, ßl, ß2) of all warp threads ( K) around all deflecting means (10, 20; 1 10, 120) overall are essentially the same size.

16. Use of a device (1; 101) according to at least one of the preceding claims for deflecting ribbon-shaped warp threads (K), in particular carbon tapes.

17. loom (50) with a device (1; 101) according to at least one of the preceding claims.