EP2994562B1 - Method for producing a woven fabric - Google Patents

Description

The invention relates to a method for producing a fabric, wherein in each case a weaving step by means of warp threads a shed is formed, in which a weft thread is introduced and the weft thread is pushed by means of a reed in the direction of a fabric edge.

Weaving machines for the production of fabrics and such fabrics are known from the prior art. In weaving, at least two thread systems are crossed at right angles, where one thread system is the warp system and the other thread system is the shot system. Prestressed warp threads form a carrier in which successive weft threads are drawn from one edge of the fabric to the other through an entire weaving width, which is formed by means of the warp threads. By weaving fabrics such. As carpets, wallpaper, composite, rubber auxiliary fabric and other technical textiles, can be produced. Weaving machines are generally used for the industrial production of fabrics. The warp threads are guided from a rear side of the weaving machine to, the weft threads are respectively entered from one side to the other between the warp threads, the so-called shed. In a finished fabric, the warp threads are held together by means of the weft threads.

The US 1,280,461 A1 describes a device for producing a fabric with warp threads, which form a shed, and weft threads, which are introduced by means of a weft insertion device in the shed. Furthermore, a reed for stopping the weft threads in the direction of a fabric edge is provided. The weft insertion device is designed such that an angle for insertion of the weft thread and for striking it in a range of approximately 45 ° is adjustable. For this purpose, a guided in oblong holes screw is provided.

A method for producing a fabric is known from FR 2 499 107 A1 known, by means of a weft insertion device an angle to the entry of the weft thread and for striking the same is set.

The invention has for its object to provide a comparison with the prior art improved method for producing a fabric.

The object is achieved by a method having the features specified in claim 1.

Advantageous embodiments of the invention are the subject of the dependent claims.

A method for producing a fabric provides that in each case a weaving step by means of warp threads a shed is formed, in which a weft thread is entered and the weft thread is pushed by means of a reed in the direction of a fabric edge. In this case, an angle to the entry of a weft thread is adjusted variably by means of a weft insertion device. In this case, the angle of the weft thread to be introduced in relation to the warp threads between 40 ° and 90 ° is adjusted by means of an adjusting unit.

According to the weft insertion device is positioned by means of an electric drive via a gear with respect to the predetermined angle.

Characterized in that the angle is set variable to the weft insertion, the weft threads are woven according to this angle in the tissue. Thus, it is possible that the weft threads form a reinforcement of the fabric and not the warp threads.

By setting an angle between 40 ° and 90 ° of the weft thread to be introduced with respect to the warp threads by means of an adjusting unit, can be essentially ensured that the angle over an entire manufacturing process is set exactly and the weft threads at the same angle to the warp threads.

In particular, in order to set the desired angle to the weft insertion, the weft insertion device is positioned by means of a rotary plate on which the weft insertion device can be arranged, and by means of a ring gear. In addition, a scale can be provided by means of which the angle set in each case is displayed.

By means of the method it is possible to produce fabrics whose weft threads run obliquely within the fabric to the warp threads, so that process steps, in particular for manufacturers in the rubber industry, as in the prior art known orthogonal arrangement of the two types of yarn to each other, no longer required are. For example, the process steps of the diagonal blank and the subsequent joining together of the cut fabric layers prior to vulcanization can be omitted.

Since it is not necessary for a fabric produced in this way to join the cut fabric layers together, there is no joint seam which can form a bump and / or joint in the fabric.

In an advantageous embodiment of the method, an angle for striking the weft thread to the fabric edge in relation to the warp thread is also set variably. The weft thread is thus not only introduced according to the set angle in the shed, but also struck at this angle to the fabric edge of the fabric, whereby the fabric is particularly advantageously formed homogeneous.

Particularly preferably, the adjustment unit is automatically shifted in the direction of the warp threads as a function of a length of the fabric, so that no personnel deployment is required for positioning the adjustment unit. moreover Because of the automatic positioning, the adjustment unit is always in an optimum position with respect to the shed to register the next weft.

An abutment movement of the reed to the fabric edge is preferably generated by means of at least one cylinder-piston unit of the adjustment, so that the respective weft thread is struck regardless of the setting of the angle exactly to the fabric edge, whereby the fabric is formed uniformly.

In one possible embodiment, the at least one cylinder-piston unit is pneumatically actuated, whereby a piston for generating the stop movement is moved by means of compressed air from a cylinder of the cylinder-piston unit. By operating the cylinder-piston unit by means of compressed air, for example, no hydraulic fluid and thus no hydraulic pump and / or a pressure accumulator is advantageously required, so that the pneumatic solution is a comparatively cost-effective alternative.

Particularly advantageously, the weft insertion device is displaced in the direction of the warp threads as a function of a length of the fabric, whereby the respective weft thread is optimally inserted into the shed. Preferably, the weft insertion device in this embodiment is coupled to the adjustment unit, so that both the weft insertion device and the adjustment unit can be displaced and optimally positioned depending on the length of the tissue.

In a particularly advantageous embodiment of the method, the weft insertion device and / or the adjustment unit are or will be controlled by means of a control unit. As a result, the production of the fabric can largely be carried out fully automatically, so that a relatively small amount of personnel is required.

Furthermore, an automatic positioning of the adjustment unit relative to the fabric edge is performed on the basis of detected signals of a detection unit. The detection unit is preferably connected to the control unit, so that the positioning of the adjustment unit can be carried out automatically on the basis of detected signals of the detection unit.

Embodiments of the invention are explained in more detail below with reference to drawings.

Figur 1

schematisch eine Verstelleinheit einer Vorrichtung zur Durchführung eine Verfahrens zur Herstellung eines Gewebes und

Figur 2

schematisch eine Draufsicht auf die Vorrichtung zur Herstellung des Gewebes.

Show:

FIG. 1

schematically an adjustment of a device for performing a method for producing a fabric and

FIG. 2

schematically a plan view of the apparatus for producing the tissue.

Corresponding parts are provided in all figures with the same reference numerals.

FIG. 1 shows an adjustment 1 of an in FIG. 2 shown device 2 for producing a fabric 3 with oblique weft threads 3.1.

Weaving machines for producing fabrics 3, which are formed from warp yarns 3.2 and weft yarns 3.1, are known from the prior art.

The warp threads 3.2 are stretched and fixed to the weaving machine, wherein by means of the warp threads 3.2 in each case a weaving step, a shed is formed, in which a weft 3.1 is introduced and guided by a fabric edge to the opposite edge of the fabric. In such a fabric 3 the weft threads 3.1 extend at right angles to the warp threads 3.2, which form a reinforcement of the fabric 3.

Such exported fabric 3 are diagonally cut in the rubber industry with a predetermined angle and then tailored as parallelograms fabric layers are then joined together, in particular by gluing. As a result, unwanted joints and / or bumps may arise, for example by means of such assembled fabric layers tires and tubes are made.

In order to reduce a number of process steps, in particular the diagonal cutting and joining, for example in the rubber industry, it is provided that the weft threads 3.1 are introduced into the shed at a predetermined angle between 40 ° and 90 ° to the warp threads 3.2. In addition, it is provided that the weft thread 3.1 introduced in each case with the predetermined angle also hits the fabric edge of the fabric 3 at this angle by means of a reed 4.

For this purpose, the device 2 for producing a fabric 3 has an in FIG. 2 Weft insertion device 4 shown in detail, which is connected to the adjustment unit 1.

The adjusting unit 1 is arranged above the warp threads 3.2 and has two cylinder-piston units 6, wherein in each case a cylinder-piston unit 6 is coupled to one end 5.1 of the reed 5. In particular, an exposed end of a piston 6.1 is coupled to the reed 5, wherein the cylinders 6.2 are attached to a retaining element not shown in detail. For example, a threaded rod for adjusting the position of the two cylinder-piston units 6 is arranged between the holding element and the respective cylinder-piston unit 6 to each other. By turning the threaded rod, the pistons 6.1 of the cylinder-piston units 6 move relative to the cylinder 6.2, which also moves the reed 5. The cylinder-piston units 6 are pneumatically, so by means of compressed air, operable. Alternatively, the cylinder-piston unit 6 may also be actuated hydraulically, by a motor and / or in any other suitable manner.

By means of the retaining element, to which the two cylinder-piston units 6 are fastened, an angle of the reed 5 with respect to the warp threads 3.2 is adjustable, so that the respective inserted into the shed weft 3.1 by means of the reed 5 this angle corresponding to the Fabric edge is struck. As described above, an angle between 40 ° and 90 ° is adjustable, so that the weft threads 3.1 are einwebbar obliquely into the fabric 3. The reed 5 is moved by means of the adjustment unit 1 such that the respective weft thread 3.1 is struck securely regardless of the set angle to the fabric edge.

The pistons 6. 1 can be moved out of the cylinder 6. 2 and retracted, whereby the reed 5 exerts a forward and backward movement and strikes the weft thread 3.1 introduced in the respective weaving step against the fabric edge to form the fabric 3. The back and forth movement of the reed 5 is carried out in the direction of the course of the warp threads 3.2, so that the warp threads 3.2 are guided linearly.

A travel path of the pistons 6.1 for striking the weft threads 3.1 is for example between 7 cm and 10 cm, so that the respective piston 6.1 between 7 cm and 10 cm from the cylinder 6.2 can be moved out. The two cylinder-piston units 6 are controlled via signals of a detection unit, not shown, in particular a proximity switch, which may be arranged on a secondary shaft of the device 2.

The holding element, to which the cylinders 6.2 of the cylinder-piston units 6 are fastened, is arranged displaceably on the device 2, so that the adjusting unit 1 can be positioned corresponding to the length of the fabric 3. In this case, the adjustment unit 1 with a control unit, not shown connected and is controlled by means of this, so that the positioning of the adjustment unit 1 takes place automatically.

In a preferred embodiment, the reed 5 is connected to a so-called batten, which is part of the weft insertion device 4, as in FIG. 2 is shown. In particular, the weft insertion device 4 is designed as a so-called gripper device.

The gripper device has a donor gripping element 4.1 and a slave gripping element 4.2. At the encoder gripping element 4.1, the weft 3.1 is fixed to the entry in the shed and is guided by means of the encoder-gripping element 4.1 to the middle of the shed. There, a transfer of the weft thread 3.1 to the slave gripper element 4.2, by means of which the weft thread 3.1 to the fabric edge is feasible.

The sley and the reed 5 are formed as a component and positioned by means of the adjusting unit 1 at a predetermined angle between 40 ° and 90 ° to the warp threads 3.2. As a result, the weft 3.1 is entered at this angle in the shed and posted by means of the reed 5 to the fabric edge.

The weft insertion device 4 can be positioned by means of an electric drive via a gear with respect to the predetermined angle, wherein the weft insertion device 4 and the adjustment unit 1 can be arranged on a rotary plate which is coupled to a ring gear to adjust the corresponding angle. Preferably, a scale is provided, by means of which the respective currently set angle can be displayed.

In the FIG. 2 shown embodiment of the apparatus 2 for producing the fabric 3 comprises a warp thread 7, the weft insertion device 4, on which a Kettfadenhebevorrichtung 8 is arranged, a fabric take 9, a goods stand 10 and a winding device 11 for winding the finished Fabric 3, wherein the cylinder-piston units 6 and the reed 5 are not shown.

By means of the warp thread 7 of the device 2, the warp threads 3.2 are provided stretched for the weaving process, wherein the warp threads 3.2 extend over a predetermined portion of the device 2.

The weft insertion device 4 is controlled by the control unit and automatically positioned depending on the length of the fabric 3.

As described above, the weft insertion device 4 has the warp thread lifting device 8, by means of which a predetermined number of warp threads 3.2 can be raised to form the shed for inserting a weft thread 3.1. In this case, the shed as well as the weft insertion device 4 extends obliquely to the warp threads 3.2.

In addition, the weft insertion device 4 is coupled to the adjusting unit 1, not shown, wherein the adjusting unit 1 is arranged parallel to the weft insertion device 4.

By means of the fabric take-off 9, the finished fabric 3 is removed from the device 2 and can be supplied via the goods level 10 of the winding device 11 for winding up the fabric 3. The warp thread system 7 and the fabric take-off 9 are firmly positioned and communicatively connected with each other, so that it is possible to weave the fabric 3 with a predetermined weft thread density and warp tension.

The winding device 11 may, for example, be designed as a vertical winder or as a center winder, wherein the winder 10 is arranged parallel to the fabric take-off 9.

To adjust the angle at which the weft threads 3.1 are introduced into the shed with respect to the warp threads 3.2 and are fastened to the fabric edge, the weft thread insertion device 4 with the warp thread lifting device 8 and the adjusting unit 1 can be adjusted between 40 ° and 90 ° to the warp threads 3.2.

The adjustment of the angle is preferably carried out automatically by means of the control unit.

LIST OF REFERENCE NUMBERS

1

adjustment

2

contraption

3

tissue

3.1

weft

3.2

warp

4

Weft insertion device

4.1

Encoder gripping element

4.2

Taker gripper

5

reed

5.1

The End

6

Cylinder-piston unit

6.1

piston

6.2

cylinder

7

warp

8th

Kettfadenhebevorrichtung

9

Fabric take

10

goods stand

11

winder

Claims (8)

1. Method for producing a woven fabric (3) by means of a device (2), wherein in a respective weaving step a weaving shed through which a weft thread (3.1) is inserted is formed by means of warp threads (3.2), and the weft thread (3.1) is displaced in the direction of a woven-fabric periphery by means of a weaving reed (5), wherein by means of a weft-insertion device (4) an angle for insertion of the weft thread (3.1) is variably adjusted, wherein the angle for insertion of the weft thread (3.1) in relation to the warp threads (3.2) is adjusted between 40° and 90° by means of a readjustment unit (1), characterized in that the weft-insertion device (4) is positioned in relation to the predetermined angle by means of an electric drive by way of a gear unit.
2. Method according to Claim 1, characterized in that an angle for beating the weft thread (3.1) against the woven-fabric periphery in relation to the warp thread (3.2) is variably adjusted.
3. Method according to one of the preceding claims, characterized in that the readjustment unit (1) is automatically displaced in the direction of the warp threads (3.2) so as to depend on a length of the woven fabric (3).
4. Method according to one of the preceding claims, characterized in that a beating movement of the weaving reed (5) against the woven-fabric periphery is generated by means of at least one cylinder-and-piston unit (6) of the readjustment unit (1).
5. Method according to Claim 4, characterized in that the cylinder-and-piston unit (6) is pneumatically activated.
6. Method according to one of the preceding claims, characterized in that the weft-insertion device (4) is displaced in the direction of the warp threads (3.2) so as to depend on a length of the woven fabric (3).
7. Method according to one of the preceding claims, characterized in that the weft-insertion device (4) and/or the readjustment unit (1) are/is actuated by means of a control unit.
8. Method according to one of the preceding claims, characterized in that automatic positioning of the readjustment unit (1) in relation to the woven-fabric periphery is performed by means of signals detected by a detection unit.

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