Circular loom

Abstract

A method and a circular loom (1) for producing a tubular fabric (14), the loom comprising: a main spindle (2), a circular reed, a shuttle (3), which rotates around the circular reed at a shuttle-rotating speed and is intended for delivering a weft tape (3A), a warp-tape feeding device (4) for feeding warp tapes (5), a tubular-fabric drawing-off device (15) for drawing off the tubular fabric (14) produced with a weft-tape density from the weft tapes (3A) and the warp tapes (5) at a tubular-fabric drawing-off rate, a measuring device (17) for acquiring a measured variable associated with a fabric width of the tubular fabric (14), and a control device (18), respectively connected to the measuring device (17) and the tubular-fabric drawing-off device (15) and used for controlling the weft-tape density, in dependence on the acquired measured variable, in such a way that the fabric width of the tubular fabric (14) is kept within a tolerance range for the fabric width.

Description

[0001] circular loom

[0002] The invention relates to a circular loom for producing a circular fabric, comprising: a main axis, a circular reed, a shuttle rotating on the circular reed at a shuttle rotation speed for delivering a weft ribbon, a warp ribbon feed device for feeding warp ribbons, a circular fabric take-off device for taking off the circular fabric produced from the weft ribbon and the warp ribbons with a weft ribbon density at a circular fabric take-off speed.

[0003] Furthermore, the invention relates to a method for producing a circular fabric with a circular weaving machine, comprising the steps:

[0004] Moving the shuttle for the weft ribbon at a shuttle rotation speed along the circular reed,

[0005] Feeding two sets of warp ribbons,

[0006] Forming a shed between the two sets of warp ribbons, whereby the shuttle, as it moves along the circular reed, introduces the weft ribbon into the shed, whereby the circular fabric with a weft ribbon density is formed from the weft ribbon and the warp ribbons,

[0007] Pulling off the round fabric at the round fabric pull-off speed.

[0008] Such circular looms have long been known in the state of the art (see, for example, EP 3 662 100 B1 and EP 2 829 645 B1). Further general state of the art is illustrated by AT 504 109 and DE 10 2013 003439 A1.

[0009] Known circular looms, as well as the circular loom according to the invention, are used to produce a tube, i.e. a seamless circular fabric, for example from flat polypropylene, polyethylene, PET or other warp and weft tapes. These must have high strength but also high elongation values ​​in order to give the bags produced from them, including the contents, the necessary strength and stability during transport and in drop tests. For the tube woven in a round state, the plain weave is preferably used, in which one warp tape is alternately lifted over the inserted weft and the next warp tape is lowered under the weft tape, creating a checkerboard pattern.The loom shed formed in this way, also known as a wave shed or traveling shed, is traversed by at least one, preferably several, shuttles, each with a rotatably mounted weft spool, along a circular orbit, during which the weft ribbon is unwound. The round fabric can be laid down on a weaving ring. Since the weft ribbons are inserted into the loom shed without twisting, the weft ribbon must be unwound by rotating the weft spool. The shuttles bring the weft ribbon unwound from the weft spool into the loom shed. Depending on the weaving ring diameter and thus on the desired tube or sack diameter, and also depending on the weaving machine speed, which determines the weft count, and the respective winding diameter, the weft spool in the shuttle rotates at high speeds while the weft ribbon is unwound.The fully wound weft spools can have a diameter of up to 115 mm and more, whereas the almost used weft spools can have a diameter of only 40 mm or less, which can essentially correspond to the outer diameter of the tube holding the weft ribbon. This means that the speed of the weft spool increases with decreasing diameter for the same number of wefts, i.e. the same speed of the circular loom. In addition, due to its cross winding, the weft ribbon can be moved back and forth over the spool length of preferably 200 mm during unwinding, which means a constantly changing change in length from the spool to the fixed take-off point of the ribbon, in particular the so-called ribbon insert.The changes in speed of the weft spool that occur during unwinding of the weft ribbon and the constantly changing tensile stresses on the weft ribbon to be inserted can only be partially compensated for with the current technology. In addition, weaving speeds have to be increased and the basis weight of the fabric to be produced has to be reduced. This requires thinner weft and warp ribbons, which react even more sensitively to the various tensile stresses that occur during weft insertion and thus influence the diameter of the circular fabric, with the resulting different elongations of the weft ribbon. A weft ribbon that is stretched during weft insertion relaxes after insertion into the shed and contracts back to its original, relaxed state, thus pulling the tube closer together.

[0010] In the current state of the art, the limited space for the shuttle's movement within the shaft compartment around the weaving ring hampers efficient unwinding of the weft ribbons. Bearing friction, various deflections of the weft ribbon in the shuttle, friction, and necessary tension compensation devices can also make consistent unwinding from the full to the empty weft bobbin difficult.

[0011] To further reduce the tube width tolerance, on known circular looms with, for example, six shuttles, the first, third, and fifth weft spools can be used half full and the second, fourth, and sixth weft spools fully wound, in order to reduce the width fluctuation of the circular fabric resulting from the transition from a full to an empty spool. However, this measure is disadvantageous because the weft spools have to be changed in two stages instead of one, and thus more frequently, which results in twice as many machine downtimes and thus significantly reduces the benefit of this measure.

[0012] Since the beginning of circular fabric production with PR, PE, PET and other materials, the fabric width has usually been measured manually in front of a fabric winder, for example at hourly or multi-hour intervals, to briefly check whether the prescribed tube width tolerance is being maintained or whether there might be a setting problem, for example with the weft spool brake. If the fabric width exceeds or falls below the tolerance range, appropriate corrections are made on the shut-down circular loom. For example, the braking torque on the weft ribbon spool can be readjusted (cf. EP 2 382 347 B1).

[0013] Particularly sensitive to width variations are the mostly produced lightweight tubular fabrics with a weight of, for example, 40 to 60 grams per square meter (m2) and so-called weft-covering tubular fabrics, i.e. wefts lie close to one another without being folded, since the distance between two weft ribbons with only small differences in distance and also different insertion tensions or elongations already leads to considerable width variations.

[0014] With conventional circular looms, the fabric width of the circular fabric varies considerably. Various measures have been taken to reduce this width variation. All of these measures are aimed solely at controlling the influence of the tension on the weft tape during insertion. Nevertheless, the width variations far exceed the desired level.

[0015] Accordingly, the object of the present invention is to alleviate or eliminate at least some of the disadvantages of the prior art. The invention preferably aims to effectively and reliably reduce the fluctuation in the fabric width.

[0016] This object is achieved by a circular loom according to claim 1 and a method according to claim 9. Preferred embodiments are specified in the dependent claims.

[0017] The circular weaving machine according to the invention is characterized by a measuring device for detecting a measured variable linked to a fabric width of the circular fabric, a control device connected to the measuring device and the circular fabric take-off device, with which the weft ribbon density is controlled depending on the measured variable in such a way that the fabric width of the circular fabric is kept within a tolerance range for the fabric width.

[0018] Accordingly, the method according to the invention for producing a round fabric is characterized by the steps:

[0019] Measuring, preferably continuously measuring, the measurement value associated with the fabric width of the round fabric,

[0020] Control of the weft tape density depending on the measured variable so that the fabric width of the circular fabric is kept within a tolerance range for the fabric width.

[0021] The measuring device records a measured variable which has a known relationship to the fabric width of the circular fabric in the form of a round tube produced on the circular loom. The fabric width refers to the transverse stretch of the circular fabric, i.e. the extension of the circular fabric perpendicular to its central axis through the open ends of the circular fabric, in the flat state, in which two long sides of the circular fabric lie flat on top of one another. A measuring signal is transmitted from the measuring device to the control device. The control device is designed to independently (i.e. without intervention from an operator of the circular loom) generate a control signal from the measuring signal, the known relationship between the measuring signal and the current fabric width as well as the desired fabric width, with which control signal the weft tape density is adjusted.The weft tape density, also called weft density (material density) for short, is the number of weft tapes woven over a certain length per 10 centimeters (cm). With a weft density of 30, for example, 30 weft tapes are woven per 10 cm of length (i.e. extension in the longitudinal direction of the tubular round fabric). The control signal is used to adjust the weft density so that the current fabric width of the drawn-off round fabric is adjusted to the desired fabric width. This allows the fabric width to be kept within the tolerance range. This results in automatic width correction of the round fabric during operation of the circular loom. The invention is based on the knowledge that the tension of the weft tape during unwinding can be adjusted using conventional measures, such as controlling the braking torque (cf.EP 2 382 347 B1) or the division into half-full and full weft spools, cannot be sufficiently controlled to keep the fabric width within a narrow tolerance range. In contrast, the invention pursues the approach of measuring the instantaneous fabric width with the measuring device, transmitting the fabric width measurement to the control device, and controlling the fabric width by adjusting the weft ribbon density.

[0022] In a first preferred embodiment, the weft density is adjusted via the circular fabric take-off device. In this embodiment, the shuttle rotation speed during the shuttle's rotation is preferably not used to adjust the weft density. In this embodiment, the control signal from the control device is transmitted to the circular fabric take-off device, which adjusts the circular fabric take-off speed accordingly.

[0023] In this embodiment, the control device is preferably designed to reduce the round fabric take-off speed by means of the round fabric take-off device when the tolerance range for the fabric width is undershot and to increase the round fabric take-off speed by means of the round fabric take-off device when the tolerance range for the fabric width is exceeded.

[0024] This principle can be illustrated by the following example.

[0025] Based on a target width of the circular fabric of, for example, 500 mm (based on the flat lying state, the so-called "double flat"), a tolerance range of the fabric width of 499 mm to 500 mm can be defined. In this embodiment, the circular fabric take-off speed is used as the control variable, with which the weft density can be influenced, particularly at a constant circular fabric take-off speed. The weft density is a known operating parameter of the circular loom. As mentioned, the weft density indicates how many weft ribbons are located in the circular fabric over a certain reference length. With a constant shuttle rotation speed, the weft density is directly related to the circular fabric take-off speed.If a reduced fabric width of, for example, 498.5 to 499 mm is measured, the weft tape density is increased from, for example, 33 tapes per 10 cm to 33.1 tapes. The weft tapes are therefore placed around the weaving ring with a slightly larger diameter and the fabric width is corrected upwards. If the measured fabric width is within the tolerance range of plus / minus 1 mm, the previously set weft density is kept constant. If the fabric width exceeds the target width by more than 1 mm and a fabric width greater than 501 mm is therefore measured, the weft density is reduced from, for example, 33 tapes / 10 cm to 32.9 tapes / 10 cm. The weft tapes are therefore placed around the weaving ring with a slightly smaller diameter and the fabric width is corrected downwards.

[0026] In a second preferred embodiment, the weft density is adjusted via the shuttle rotation speed. In this embodiment, the circular fabric take-off speed is preferably not used to adjust the weft density. In this embodiment, the control device can influence a rotational speed of a machine shaft along the main axis, which determines the shuttle rotation speed, as a control variable in order to adjust the weft density accordingly.

[0027] In a preferred embodiment, the tolerance range for the fabric width is less than plus / minus 0.5% of the target width. This means that the fabric width does not fluctuate by more than 1% of the target width when unwinding the weft tape. Depending on the application, the round fabric can have a width fluctuation (always related to the "double flat") of a maximum of 99.5% to 100.5% of the target width. By monitoring the width and the associated weft density correction, a tolerance range of plus / minus 0.5% of the target width can be guaranteed from full to (almost) empty weft spools without manual intervention.

[0028] In a preferred embodiment, several shuttles, for example four, six, eight, or more, are provided, each with a weft spool. A division with 50% full and 50% half-full weft spools, as in the prior art, is not mandatory in this embodiment and is preferably not provided either.

[0029] In one embodiment, the tolerance range for the fabric width is 5 mm (i.e. target width plus / minus 2.5 mm) if the target width of the round fabric is 500 mm.

[0030] A fabric width fluctuation of, for example, plus / minus 3 mm can be ensured for a target width of 500 mm with a change in the weft density of, for example, plus / minus 0.3 weft ribbons per 10 cm (32.7 to 33.3 / 10 cm). Averaged over the unwinding process of the weft spool, there is no additional effort in the weft density; advantageously, however, the required fabric width can be maintained with a small tolerance range, further processing of the round hose is made much easier, and material is saved.

[0031] In order to be able to correct deviations from the desired fabric width quickly and reliably, the measuring and control device in a preferred embodiment is set up for the continuous recording of the measured variable linked to the fabric width and for the continuous control of the weft tape density, in particular via the circular fabric take-off speed or via the shuttle rotation speed. The continuous recording of the measured variable preferably comprises at least one measuring process per minute, preferably at least one measuring process every 10 seconds, in particular at least one measuring process per second. The control signals with which the weft density, in particular the circular fabric take-off speed or the speed of the machine shaft, is adjusted in such a way that the fabric width neither exceeds nor falls below the tolerance range.

[0032] In a preferred embodiment, the round fabric take-off device has at least one take-off roller driven by a motor, wherein the speed of the take-off roller can be varied by means of the control device in order to adjust the round fabric take-off speed. In this embodiment, the speed of the take-off roller forms the control variable, which is adjusted by the control device. The round fabric take-off speed is the peripheral speed of the take-off roller.

[0033] In a preferred embodiment, a weaving ring for deflecting the circular fabric is arranged within the circular reed, wherein the measuring device is designed to detect a radial extension of the circular fabric outside the weaving ring as a measured variable. In this embodiment, the so-called “pre-fabric” is detected outside the weaving ring (i.e. before the warp tapes are deflected around the weaving ring). The radial extension of the circular fabric outside the weaving ring is measured, i.e. how far the circular fabric protrudes outwards from the weaving ring in the radial direction, as seen from the center of the weaving ring. This measured variable has a known relationship to the fabric width, so that the fabric width can be deduced from the measured radial extension of the circular fabric outside the weaving ring. The greater the radial extension of the circular fabric outside the weaving ring, the greater the current fabric width.Depending on the measurement signal, the corresponding control signal can be generated, with which the weft tape density can be adjusted so that the fabric width follows the target width. This design variant has the particular advantage that width fluctuations can be detected and compensated for immediately. In a further preferred embodiment, a fabric round holder is provided above the weaving ring, which is preferably arranged 200 to 300 millimeters (mm) above the weaving ring, wherein the measuring device for detecting a diameter of the round fabric is designed on the fabric round holder as a measured variable. In this embodiment, the diameter of the fabric round holder can be variable depending on the current fabric width, for example via a device for resiliently adjusting the diameter of the fabric round holder through the round fabric.Thus, the measuring device can measure the current diameter of the fabric holder to determine the current fabric width. This variant has the advantage of enabling particularly responsive control.

[0034] In a further preferred embodiment, the measuring device for detecting the fabric width of the round fabric in the flat state is designed as a measured variable, in particular on or after the take-off roller of the round fabric take-off device. This variant has the particular advantage of simpler measurement, for example, on a bag spreader roller, and can be very precise due to a mechanical transmission, whereby an additional mechanical-electronic transmission of the manipulated variable input signal can be provided.

[0035] In a preferred embodiment, an electronic measuring device is provided which has a measuring sensor which monitors the fabric width of the round fabric, preferably mechanically or optically, for example with a camera or with a light barrier, at the measuring position.

[0036] Depending on the design, the respective measuring signal can be transmitted to the electronic control device, with which the circular fabric take-off speed or the shuttle rotation speed is adjusted in order to recalibrate the weft density as described above if the tolerance range of the fabric width is exceeded or not met.

[0037] The invention is further explained below with reference to an exemplary embodiment illustrated in the drawing. Fig. 1 shows a schematic side view of a circular weaving machine according to the invention, in which the fabric width is continuously recorded and maintained within a tolerance range.

[0038] Fig . 2 shows a section of Fig . 1 .

[0039] Fig. 1 shows a circular loom 1 which is designed for the use of ribbons, threads, monofilaments and multifilaments as warp ribbons 5 and weft ribbons 3A. The circular loom 1 has a circular reed (not shown, designed for example according to EP 3 662 100 B1), hereinafter also referred to as reed for short, which is arranged in a ring around a substantially vertical main axis 2, along which a machine shaft runs. A shuttle 3 (shown only schematically) with a weft ribbon spool for delivering a weft ribbon 3A (cf. Fig. 2) is guided along the reed. The shuttle rotational speed is controlled via the speed of the machine shaft. A shedding eccentric which drives the shuttles 3 via push rods can be located on the machine shaft. Preferably, at least six shuttles 3 are provided, which are guided in a circle around the reed.The circular loom 1 also has a warp ribbon feed device 4 with a supply holder 4A, here a so-called creel, on which warp ribbon spools 4B with warp ribbons 5 are arranged vertically one above the other in horizontal rows. On the opposite side of the circular loom 1, mirrored with respect to the main axis 2, a further supply holder (not shown) is provided, which can be of identical design. The warp ribbons 5 are fed from the warp ribbon spools 4B via creel eyelets 6 at angles 6A to a feed device 7 which has a deflection roller 8 and a feed roller 9. The feed roller 9 is driven by a motor (not shown) in order to influence the feed of the warp ribbons 5.

[0040] As can also be seen from Fig. 1, the warp ribbons 5 are fed after the draw-in device 7 via further deflection rollers 10, 11 and an eyelet arch 12 to an arrangement of guide and length compensation elements 13, so-called compensators, which are arranged around the main axis 2, outside the reed. With the help of the guide and length compensation elements 13, dynamic fluctuations in the warp ribbon tensions are compensated. Between the guide and length compensation elements 13 and the reed, shed-forming devices (not shown here) are arranged distributed around the reed, with which two (schematically visible) sets of warp ribbons are produced which carry out mutually opposite alternating movements upwards and downwards, whereby a shed is opened and closed.In the open state, the shed forms a space defined by the two warp ribbon sets, through which the shuttle 3 moves with the weft ribbon spool and releases a weft ribbon 3A in order to produce the circular fabric 14.

[0041] As can be seen from Fig. 1, the circular weaving machine 1 also has a circular fabric take-off device 15 for taking off the circular fabric 14 produced from the weft tapes 3A and the warp tapes 5. The circular fabric take-off device 15 has at least one take-off roller 16, with which a circular fabric take-off speed can be adjusted. The circular fabric take-off speed preferably corresponds to the peripheral speed of the take-off roller 16.

[0042] As can also be seen from Fig. 1, the circular weaving machine 1 also has a measuring device 17 which is designed to record the fabric width of the circular fabric 14 or a different measured variable which is linked to the fabric width of the circular fabric 14. The measuring device 17 is designed to transmit the measured variable to a control device 18 which, in the exemplary embodiment shown, is connected to the circular fabric take-off device 15. The control device 18 is designed to control the circular fabric take-off speed via the circular fabric take-off device 15 as a function of the measured variable in such a way that the fabric width of the circular fabric 14 is kept within a tolerance range of, for example, plus / minus 0.5% of the target value for the fabric width.For this purpose, the control device 18 can be connected to a memory 19 in which a characteristic curve for linking the measured variable with the manipulated variable of the control device 18 can be stored in order to adapt the current fabric width to the target value of the fabric width. During operation of the circular loom 1, the circular fabric take-off speed can be reduced by means of the circular fabric take-off device 15 if the lower limit of the tolerance range for the fabric width is undershot, or the circular fabric take-off speed can be increased by means of the circular fabric take-off device 15 if the upper limit of the tolerance range for the fabric width is exceeded. In the exemplary embodiment shown, the speed of the take-off roller 16 is used as the manipulated variable of the control device 18.By increasing or decreasing the speed of the take-off roller 16, the circular fabric take-off speed is adjusted so that the fabric width of the circular fabric 14 at the location of the measuring device 17 is adjusted to the desired width. In an alternative embodiment (not shown), the weft ribbon density is adjusted via the speed of the machine shaft, which determines the shuttle rotation speed.

[0043] Depending on the design, the measurement variable related to the fabric width can be measured at different points on the circular weaving machine 1 .

[0044] As can be seen from Fig. 2, in a first variant, a weaving ring 20 is arranged within the circular reed (i.e., on the side of the circular reed facing away from the warp tape feed device 4) to deflect the circular fabric 14 upwards in the direction of the circular fabric take-off device 15. In the first variant, the radial extension B of the circular fabric 14 outside the weaving ring 20 serves as the measured variable of the measuring device 17.

[0045] As further evident from Fig. 1, an annular fabric holder 21 is provided above the weaving ring 20 and at a vertical distance therefrom, the diameter of which can be varied against spring force by the circular fabric passing therethrough. In a second variant, the diameter of the fabric holder 21 and thus of the circular fabric 14 on the fabric holder 21 is provided as the measured variable of the measuring device 17.

[0046] As can also be seen from Fig. 1, the measuring device 17 in a third variant is designed to detect the fabric width of the round fabric 14 in the flat state (so-called double flat), in particular on the take-off roller 16 of the round fabric take-off device 15.

[0047] Depending on the design, the measuring device 17 can, for example, have an optical or mechanical measuring sensor that can measure the measured variable precisely.

[0048] Reference numbers:

[0049] 1 circular loom

[0050] 2 main axis

[0051] 3 shuttles

[0052] 3A weft ribbons

[0053] 4 Warp tape feed device

[0054] 4A storage holder

[0055] 4B warp tape spools

[0056] 5 warp ribbons

[0057] 6 gate eyes

[0058] 6A angle

[0059] 7 Feed device

[0060] 8 deflection roller

[0061] 9 Feed roller

[0062] 10 , 11 additional deflection rollers

[0063] 12 eyelet arches

[0064] 13 length compensation elements

[0065] 14 round fabrics

[0066] 15 Round fabric take-off device

[0067] 16 Take-off roller

[0068] 17 Measuring device

[0069] 18 Control device

[0070] 19 storage

[0071] 20 Webring

[0072] 21 fabric round holder

[0073] B Radial extension of the round tissue

Claims

Claims:

1. Circular weaving machine (1) for producing a circular fabric (14), comprising: a main axis (2), a circular reed, a shuttle (3) rotating on the circular reed at a shuttle rotation speed for delivering a weft ribbon (3A), a warp ribbon feed device (4) for feeding warp ribbons (5), a circular fabric take-off device (15) for taking off the circular fabric (14) produced from the weft ribbon (3A) and the warp ribbons (5) with a weft ribbon density at a circular fabric take-off speed, characterized by a measuring device (17) for detecting a measured variable linked to a fabric width of the circular fabric (14), a control device (18) connected to the measuring device (17) and the circular fabric take-off device (15), with which the weft ribbon density is dependent on the measured The measured variable is controlled in such a way that the fabric width of the round fabric (14) is kept within a tolerance range for the fabric width.

2. Circular weaving machine (1) according to claim 1, characterized in that the control device (18) is designed to control the weft ribbon density by reducing the circular fabric take-off speed by means of the circular fabric take-off device (15) when the tolerance range for the fabric width is undershot and by increasing the circular fabric take-off speed by means of the circular fabric take-off device (15) when the tolerance range for the fabric width is exceeded.

3. Circular weaving machine (1) according to claim 1 or 2, characterized in that the control device (18) is designed to control the shuttle circulation in order to control the weft ribbon density. speed of the shuttle (3) is to be increased if the tolerance range for the fabric width is not reached and is to be reduced if the tolerance range for the fabric width is exceeded.

4. Circular weaving machine (1) according to one of claims 1 to 3, characterized in that the measuring and control device (17, 18) is designed for the continuous detection of the measured variable associated with the fabric width and for the continuous control of the weft tape density.

5. Circular weaving machine (1) according to one of claims 2 to 4, characterized in that the circular fabric take-off device (15) has at least one take-off roller (16) driven by a motor, wherein the speed of the take-off roller (16) can be changed by means of the control device (18) in order to adjust the circular fabric take-off speed.

6. Circular weaving machine (1) according to one of claims 1 to 5, characterized in that a weaving ring (20) for deflecting the circular fabric (14) is arranged within the circular reed, wherein the measuring device (17) is designed to detect a radial extension of the circular fabric (14) outside the weaving ring (20) as a measured variable.

7. Circular weaving machine (1) according to one of claims 1 to 6, characterized in that a fabric circular holder (21) is provided above the weaving ring (20), wherein the measuring device (17) for detecting a diameter of the circular fabric (14) on the fabric circular holder (21) is designed as a measured variable.

8. Circular weaving machine (1) according to one of claims 1 to 7, characterized in that the measuring device (17) for detecting the fabric width of the circular fabric (14) in the flat state is designed as a measured variable, in particular on or after the take-off roller (16) of the circular fabric take-off device (15).

9. Method for producing a circular fabric (14) with the circular weaving machine (1) according to one of claims 1 to 8, with the RECTIFIED SHEET (RULE 91) ISA / EP Steps: Moving the shuttle (3) for the weft ribbon (3A) at a shuttle rotation speed along the circular reed, Feeding two sets of warp ribbons (5) , Forming a shed between the two sets of warp ribbons (5), wherein the shuttle (3) during its movement along the round reed introduces the weft ribbon (3A) into the shed, whereby the round fabric (14) with a weft ribbon density is formed from the weft ribbon (3A) and the warp ribbons (5), Pulling off the round fabric (14) at the round fabric take-off speed, characterized by measuring the measured variable associated with the fabric width of the round fabric (14), Regulating the weft tape density, preferably via the round fabric take-off speed, depending on the measured variable, so that the fabric width of the round fabric (14) is kept within a tolerance range for the fabric width.

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