CN109844198B

CN109844198B - Measuring device for measuring warp tension in a weaving machine and weaving machine with such a measuring device

Info

Publication number: CN109844198B
Application number: CN201780064919.9A
Authority: CN
Inventors: D.奥伯迈尔; M.菲比希
Original assignee: Lindauer Dornier GmbH
Current assignee: Lindauer Dornier GmbH
Priority date: 2016-10-20
Filing date: 2017-10-19
Publication date: 2020-10-23
Anticipated expiration: 2037-10-19
Also published as: EP3529404B1; DE102016220546B3; JP2019535914A; WO2018073386A1; JP6938629B2; EP3529404A1; CN109844198A

Abstract

The invention relates to a device (2) for measuring the warp tension in a weaving machine (1), comprising: a measuring element configured as a deflection element (17) having two ends (17 a, 17 b) by which warp threads (5) of the weaving machine (1) can be guided; a force measuring mechanism (18); and a lever (21) which is mounted on a frame (20) of the weaving machine (1) in a manner such that it can be rotated about a fixed rotation point (19). The force measuring device (8) can be acted upon by the measuring element by means of the lever. The deflection element (17) is mounted with one of its two ends (17 a, 17 b) on a lever (21) and with the other of its two ends (17 a, 17 b) on a frame (20) of the weaving machine (1) in a non-movable manner. The invention also relates to a weaving machine (1) having a machine frame (20) and having at least one device (3) for conveying warp threads (5), having at least one device (2) for measuring warp thread tension, which is arranged downstream of the device (3) for conveying warp threads (5) in the warp direction and comprises a deflection element (17) as a measuring element.

Description

Measuring device for measuring warp tension in a weaving machine and weaving machine with such a measuring device

Technical Field

The invention relates to a measuring device for measuring the warp tension in a weaving machine, with a measuring element which has two ends and is designed as a deflection element, by means of which the warp threads of the weaving machine can be guided. The measuring device furthermore comprises a force measuring device and a lever which is mounted on the frame of the weaving machine so as to be pivotable about a fixed pivot point and by means of which the force measuring device can be acted upon by the measuring element. The invention further relates to a corresponding weaving machine with such a measuring device.

Background

Warp tension sensors are used in weaving machines in order to maintain a uniform warp tension during weaving, which is required for uniformly forming the fabric and in particular for avoiding warp breaks. The warp thread tension is usually controlled or regulated by a correspondingly drivable let-off mechanism, which is regulated by the loom control as a function of the signal of a warp thread tension sensor.

For measuring the warp tension on a weaving machine, different methods and devices are known in the prior art. What is achieved in principle is a measuring method in which the force exerted by the warp threads on a backrest that can be moved in an oscillating manner or is mounted in an oscillating manner on the weaving machine is determined. Such back beams are arranged on the weaving machine in order to equalize the tension variations in the warp yarns based on the alternate shed formation. The backrest is moved periodically in order to equalize the warp tension during shed alternation, which can be achieved passively by elastic support of the backrest or also actively by corresponding actuation of the backrest. Such a rear beam is particularly well suited for detecting changes in warp tension due to the vibratable support of the rear beam.

For example, EP 2584079 a1 describes a warp tension sensor with a rear beam that can be moved or oscillated in an oscillating manner transversely to its longitudinal axis. The rear beam, which can vibrate, is connected here via a lever to a force measuring device, which is itself arranged firmly on the machine frame. The force acting on the back beam through the warp is transmitted to the force measuring mechanism through the lever. A disadvantage of this embodiment is that, due to the warp threads running on the back rest and due to the reaction of the weaving process, vibrations occur on the skimming roller (Streichwalze) and thus also on the force measuring means, which vibrations may distort the measurement result. Furthermore, due to the large forces acting on the backrest by the warp threads, it is necessary to design this backrest more firmly, which, due to the higher inertia, likewise makes an accurate measurement of the warp thread tension difficult.

Disclosure of Invention

The object of the invention is therefore to provide a measuring device for measuring the warp thread tension in a weaving machine, which allows a more accurate measurement. Furthermore, a corresponding weaving machine with such a measuring device is to be proposed.

This object is achieved by the features of the independent claims.

Measuring device for measuring the warp tension in a weaving machine, with a measuring element which has two ends and is designed as a deflection element, through which the warp threads of the weaving machine can be guided, with a force measuring mechanism and a lever which is mounted on a frame of the weaving machine so as to be pivotable about a fixed pivot point and by means of which the force measuring mechanism can be acted upon by the measuring element. Provision is made for the steering element to be mounted with one of its two ends in the lever and with the other end to be mounted on the frame in a non-movable manner. By mounting the steering element with one end on the lever, the steering element is mounted on the frame so as to be movable at this end. This achieves, on the one hand, that the deflection element can be moved within the machine frame to a limited extent, so that changes in the warp thread tension can be registered by the force measuring means. However, unlike the sweep rollers used hitherto as measuring elements, the deflection element is not able to oscillate but is supported firmly on the machine frame, which results in a much cleaner measuring signal. The measurement results obtained can thus be better evaluated and the warp tension, which is advantageous for the weaving process, is kept constant. In this embodiment, it is also advantageous if, on the basis of the one-sided fixed mounting of the deflecting element in the machine frame, a part of the occurring warp forces can be conducted directly to the machine frame and only a part of said forces can be conducted via the force measuring means. The accuracy of the measurement results is thereby also further improved. While the components of the measuring device for measuring the warp tension are therefore subjected to less load.

The frame, of course, contains the entire frame of the weaving machine and may be composed of a plurality of components which form the basis for adding different functional groups of the weaving machine.

A weaving machine is therefore also proposed, with: a frame; at least one conveying device for conveying warp yarns; and at least one measuring device for measuring the warp thread tension, which is arranged downstream of the conveying device for conveying warp threads in the warp direction and comprises a deflection element as a measuring element. The measuring device for measuring warp tension is provided as described above with a deflection element as a measuring element, which is firmly supported with one of its two ends on the machine frame and with the other of its two ends on the lever. Since the deflection element is not mounted on the machine frame in a manner that enables oscillation according to the invention, the oscillation of the weaving machine and of the measuring element itself influences the measurement result to a substantially smaller extent than hitherto, so that the warp tension can be set more accurately.

According to an advantageous embodiment of the measuring device for measuring the warp thread tension or of the weaving machine with such a measuring device, the deflection element is designed as a rotatable deflection roller for the warp threads. Due to the rotatability of the deflection roller, the surface of the deflection roller can follow the movement of the warp threads in the warp direction, so that a little friction force occurs between the warp threads and the deflection roller. However, it is also conceivable that the deflection element is not designed to rotate, but is designed to be stationary, for example as a stationary roller or stationary scraper (Streichblech), on which the warp threads slide. In this stationary deflecting element, it is advantageous if this deflecting element can be designed simply and compactly and can therefore also be used in narrow spaces.

According to a first advantageous development of the invention, the lever is fixed in its pivot point to the frame of the weaving machine. This mounting of the lever can be implemented in a constructionally simple manner.

It is also advantageous if the lever is configured as a two-armed lever, wherein the first lever arm is connected to the steering element and the second lever arm is connected to the force measuring device. The force measuring device is advantageously designed for measuring the tensile force with a strain gauge and is connected with its one end to the second lever arm, and is fastened with its other end to the machine frame in a stationary manner. This arrangement with a two-armed lever offers the possibility of force transmission in order to reduce the forces acting on the force measuring device even further. This helps to improve the measurement results. However, the lever can of course also be designed as a single-arm lever, wherein the force measuring device is then preferably articulated to the end of the lever and the measuring or deflection element is articulated between the pivot point and the end of the lever, in order to advantageously reduce the forces acting on the force measuring device.

It is also advantageous in the case of a two-armed lever for the second lever arm to have a greater length than the length of the first lever arm. The magnitude of the force component acting on the force measuring means is thereby further reduced. It is particularly advantageous here if the length of the second lever arm is at least twice as long as the length of the first lever arm, particularly preferably at least three times as long. The length of the lever arm is determined by the shortest distance between the respective pivot point of the steering element or of the force measuring device and the pivot point of the lever.

It is also advantageous if the measuring device comprises at least one thread deflection element, by means of which the warp threads of the weaving machine can be guided by the deflection element in such a way that the effective lever arm length of the warp thread force acting on the deflection element is smaller than the length of the first lever arm. The effective lever arm here means the shortest distance between the force caused by the warp tension on the deflection element and the pivot point of the lever. The force acting on the force measuring means can thereby also be further reduced. The measuring device for measuring warp tension is therefore also suitable for weaving machines in which extremely high warp forces of 50 kN and above occur. An extremely accurate measurement result is thus obtained here. The thread deflecting element can here either be formed by an always present deflecting roller or can be arranged as an additional thread deflecting element along the warp direction (kertfandeverlauf). Furthermore, the yarn deflection element can also be a backrest which is always present on the weaving machine.

According to a further embodiment of the invention, the lever is not directly fastened to the machine frame at its pivot point, as described above, but rather has a cylindrical bearing section, by means of which the lever is rotatably mounted in a cylindrical receptacle of the machine frame. The pivot point of the lever is thus located in the center of the cylindrical bearing section, while the fastening is performed on the circumference of the cylindrical bearing section. Such a lever with a cylindrical bearing section can of course also be designed as a single-arm or double-arm lever and furthermore also interacts with the thread deflection element as described above.

It is particularly advantageous if the bearing section of the lever is designed as a cylindrical collar and the receptacle of the frame as a cylindrical recess. The cylindrical flange is then supported with its outer circumference in a recess of the frame.

A further advantageous embodiment is achieved in that the cylindrical bearing section of the lever is designed as a bearing bush, which is fastened to the lever, for example by screws, on one of its end faces. The other end face of the bearing sleeve has, for example, a thrust shoulder (Anlaufbund) which is fixed or likewise screwed to the bearing sleeve and serves to guide the bearing section axially in the machine frame.

The bearing segments of the above-mentioned embodiments can be mounted in a manner that allows them to rotate relative to the frame both in the plain bearing and in the rolling bearing.

A particularly compact design of such a lever is achieved if the cylindrical bearing section has an eccentrically arranged bearing bore, in which the deflecting element is supported. The length of the first lever arm is thus determined as the distance between the pivot point or center point of the cylindrical bearing section and the center point of the eccentrically arranged bearing bore. With such a lever, the length of the lever arm connected to the deflection element can be influenced and the warp force acting on the measuring element can be reduced thereby. In this case, a simple assembly of the lever with the cylindrical bearing section or the frame with the cylindrical receptacle is achieved.

The mounting of the deflecting element in the eccentrically arranged bearing bore is carried out, for example, in a conventional cylindrical plain bearing or rolling bearing. However, the use of spherical ball bearings, which can compensate for the deflection of the steering element relative to the lever or relative to the frame, is particularly advantageous.

In a weaving machine with a measuring device for measuring warp tension as described above, it is also advantageous if the weaving machine comprises a backrest which can be moved in an oscillating manner transversely to the axis of the weaving machine or can be vibrated and which is preferably arranged in the warp course behind a deflection element of the measuring device for measuring warp tension. The back beam is normally used to equalize the tension variations of the warp yarns and the guiding of the warp yarns. If the backrest is arranged after the deflection element of the measuring device for measuring warp tension, this backrest can additionally be used in an advantageous manner for reducing the forces acting on the deflection element. In principle, however, it is also possible to arrange the rear beam already before the deflecting element of the measuring device for measuring the warp tension.

It is also advantageous if the backrest is designed without rollers with at least one thread deflection element extending transversely to the warp direction of the weaving machine. In contrast to conventional oscillating sweep rolls with low mass and high natural frequency, such a thread deflection element can be designed in such a way that it causes little oscillation and therefore the warp threads are subjected to only low loads. However, the weaving machine can of course also be provided with a conventional backrest which oscillates either in a positively controlled manner or in a non-positively controlled manner.

If the backrest is configured without rollers, it is also advantageous if at least one yarn deflection element is configured as a deflection plate. Such a deflector plate can be manufactured with a low mass. According to a first embodiment, the deflector itself can be designed to be elastic in order to equalize the warp thread tension. Alternatively and/or additionally, the thread deflection element is fastened to the machine frame and/or to a fastening strut connected to this machine frame by means of an elastic support. The elastic support can be configured, for example, as a leaf spring and thus in turn effects a movement of the thread deflection element. The thread deflecting element can of course also be embodied as a rigid deflecting element, for example as a rod, in the case of such elastic mounting or fastening with an elastic support. For example, EP 2126173B 1, to which reference is made in its entirety, shows a rear beam with a yarn-deflecting element supported by means of an elastic support. Other embodiments of the back rest are of course also conceivable. For this purpose, reference is also made, for example, to WO 2015/049216, which shows a rear beam with a driven yarn deflecting element, which is provided with an adjustable spring element.

It is also advantageous if the weaving machine has a measuring device for measuring the warp thread tension, which measuring device comprises a lever with a cylindrical bearing section, by means of which the lever is rotatably mounted on a receptacle of the machine frame. The lever further comprises an eccentrically arranged bearing bore for supporting the steering element. This results in a compact design of the device and facilitates the mounting of the device on the weaving machine by means of the receptacle of the machine frame.

It is particularly advantageous if the described device with a lever with a cylindrical bearing section is arranged on a measuring device for measuring the warp tension of the upper warp threads. In particular in combination with a measuring device arranged above the weaving plane for conveying warp yarns for the upper warp yarns, the mounting of the measuring device on the weaving machine can thereby be facilitated.

A particularly advantageous embodiment of the weaving machine described furthermore has a conveying device for conveying warp threads, which is preferably arranged below the weaving plane and is designed to convey lower warp threads. Measuring devices for measuring the warp tension are also assigned to such conveying devices.

Drawings

Further advantages of the invention are illustrated by the exemplary embodiments shown below. In the figure:

FIG. 1 is a schematic side view of a weaving machine with a measuring device for measuring warp tension;

FIG. 2 is a schematic side view of a measuring device for measuring warp tension;

FIG. 3 is a schematic view of a support structure of a diverting element of a measuring device for measuring the warp tension;

FIG. 4 is a schematic side view of a measuring device for measuring warp yarn tension in an alternative embodiment;

FIG. 5 shows in cross section a portion of a housing with a receptacle for a lever in an alternative embodiment;

FIG. 6 shows in a schematic cut-away side view another embodiment of a measuring device for measuring warp thread tension with a thread deflection element;

FIG. 7 shows, in a cut-away side view, another embodiment of a measuring device for measuring warp thread tension with a thread deflection element; and

fig. 8 shows schematically a weaving machine with upper and lower warp threads, to which a measuring device for measuring the warp tension is assigned, respectively.

Detailed Description

Fig. 1 is a schematic side view of a weaving machine 1 equipped with a measuring device 2 for measuring the warp tension. The warp threads (Kettf ä den) 5 are usually unwound from a warp beam (Kettbaum) 4 of a transport device 3 for transporting the warp threads (abgewicket) and are transported in the warp direction KR (see arrows) successively via a measuring device 2 for measuring the warp thread tension, a backrest beam (Streichbaum) 6 and a warp thread monitor (kettfodenw ä chter) 7 to a shed-forming device (farhbeldemtiteln) 8, which is usually movable in an oscillating manner and relative to one another in order to form a shed (Webfach) 11. The rear support has a deflecting element 22 and can be designed in different ways, as will be explained in more detail with reference to the following figures. The weft insertion device (schusseinteragmittel) is not shown and can be constructed in different ways and is well known in the art. The weaving machine furthermore has a reed (Webblatt) 9, by means of which an inserted weft thread (schusfaden) can be driven (angelschlagen) to a weaving point (bindinpukt) 10 of the already produced fabric. The woven fabric is drawn off at the end of the weaving machine 1 opposite the warp beam 4 by means of a draw-in roller (Einziehwalze) 13 and wound onto a cloth beam (Warenbaums) 14. A plurality of deflection rollers 12 can also be seen in the region of the draw-in roller 13 or the cloth beam 14.

According to the present illustration, the weaving machine 1 also has a drive 15 for the warp beam 4 for the targeted control of the let-off (kertablass) and a further drive 15 for the controlled drive of the draw-in roller 13. The reed 9 is connected to the main drive 35 of the weaving machine 1. Furthermore, the weaving machine 1 has a control unit 16, by means of which sensor data can be detected or the drives can be actuated in order to ensure trouble-free operation of the weaving machine and to achieve uniform fabric production (Gewebe). The device is connected here to a control unit 16 of the weaving machine 1 by means of a signal-transmitting line, as is shown by a dot-dash line. The contour of the gantry 20 is also schematically shown (Umrisse).

The measuring device 2 for measuring the warp thread tension contains, in a manner known per se, a deflection element 17 which can be acted upon by the tensile stress (Zugspannung) of the warp threads 5 and which is connected to a force measuring mechanism (18, see fig. 2 and 4) in order to be able to measure the warp thread tension. The information about the warp tension (tensile stress) of the warp threads 5 is likewise transmitted via the signal-transmitting lines (dotted lines) to a control unit 16 of the weaving machine 1, which in turn correspondingly actuates the drive 15 of the warp beam 4 in order to cause a change in the tensile stress of the warp threads 5.

Fig. 2 shows schematically in a side view a measuring device 2 for measuring warp tension. The measuring device 2 comprises a deflection element 17 which has two

ends

17a, 17b (see fig. 3) and by means of which the warp threads 5 (not shown here) can be guided to the weaving machine 1. The deflection element 17 is mounted in the frame 20 of the weaving machine 1 by means of a lever 21 in such a way that a change in the tension of the warp threads 5 can be transmitted to the force measuring means 18 by means of the lever 21. The force measuring means 18 is preferably designed for measuring tensile stresses and has, for example, strain gauges (dehnmesstrieffen). The force measuring means 18 is connected to the control unit 16 in a signal-transmitting manner as already described in fig. 1, as is indicated by the dashed dotted line. The measuring device 2 for measuring the warp tension thus corresponds to the measuring device 2 known so far in terms of the components, i.e. the deflection element 17, the lever 21 and the force measuring means 18. The difference with the hitherto known measuring device 2 is, however, that the deflecting element 17 is not designed as a vibrating (schwinender) rear beam, but rather is supported at least in sections rigidly on a machine frame 20, of which only one section is shown in the non-continuous figures. Of course, the frame 20 contains the entire frame (Gestell) of the weaving machine 1 and may be composed of a plurality of components which form the basis for adding different functional groups of the weaving machine. As can be seen from fig. 2, the deflecting element 17 is supported with its first end 17a on the frame 20 via a lever 21.

Fig. 3 shows a further part of the frame 20 in a likewise discontinuous view. Fig. 3 also shows a dashed-dotted representation of the deflecting element 17, which is supported with its second end 17b in the illustrated part of the frame 20.

In order to be able to measure the tensile stress of the warp threads 5 by means of the deflection element 17, the deflection element 17 is movably supported with its first end 17a on the machine frame 20, but fixedly supported with its second end 17b on the machine frame 20. The non-movable mounting of the deflecting element 17 with its second end 17b on the machine frame 20 is shown in fig. 3 and can be carried out, for example, by means of a bearing cap 27. The steering element 17 is mounted on its end 17a opposite the second end 17b in a movable lever 21 and is therefore mounted on the frame 20 in a movable manner. The lever 21 is in the present case designed as a two-armed lever 21 and is fixed in its pivot point 19 on the frame 20. The lever 21 has a first lever arm 21a, in which the deflecting element 17 is mounted and to which the lever is articulated via an articulation point 31, and a second lever arm 21b, to which the force-measuring means 18 is articulated in the articulation point 31. If the force F is now acting on the deflection element 17 and thus on the lever arm 21a as a result of the tensile stress of the warp threads 5, the force F transmitted via the lever 21 can be registered by the force measuring means 18. It is particularly advantageous here that, since the deflecting element 17 is rigidly supported at its second end 17b, only a part of the occurring warp thread force (Kettkr ä fte) is directed onto the force measuring means 18. The measuring device 2 is therefore also particularly suitable for weaving machines on which extremely high warp forces occur.

As can also be seen from fig. 2, the length L1 of the first lever arm 21a is smaller than the length L2 of the second lever arm 21b, as a result of which the force acting on the force measuring device 18 is further reduced.

In the following description of fig. 4 and 5, identical reference numerals are used for features which are identical or at least similar in their design and/or mode of action compared to the embodiments shown in fig. 2 and 3. In case the features are not explained separately again, the design and/or the mode of action of these features correspond to the design and the mode of action of the features already explained with the aid of fig. 2 and 3.

Fig. 4 again shows the frame 20, the force measuring means 18 and the profile of the deflection element 17 in the diagram of the dotted line. The lever 21 is also in the present case designed as a two-armed lever 21, but is not fixed to the frame 20 at its pivot point 19. More precisely, the lever 21 has a cylindrical bearing section 23, by means of which it can be rotatably mounted on a likewise cylindrical receptacle 24 on the frame 20.

As shown in the present case, the receptacle 24 is configured as a cylindrical recess, while the lever 21 has a cylindrical collar or flange as the bearing section 23. The receptacle 24 and the bearing section 23 are covered by the front side of the lever 21 in fig. 4 and are therefore shown in dashed lines. It is now possible for the lever 21 to be inserted with its cylindrical collar or flange into the receptacle 24 of the housing, so that, according to the present embodiment, the lever 21 is supported with its cylindrical collar on its outer circumference in the housing recess. However, it is of course also conceivable to provide the frame 20 with a cylindrical collar or flange and to provide the lever 21 with a corresponding recess as the bearing section 23. Since the cylindrical bearing section 23 is rotatable in the cylindrical receptacle 24, the lever 21 can now also be rotated about its rotation point 19 corresponding to the center of the cylindrical receptacle 24.

As can now be seen in fig. 4, the lever 21 also has a bearing bore 25 in which the deflecting element 17 is supported with its first end 17 a. The center point forms a bearing bore 25 for the pivot point 31 of the deflection element 17, which is arranged eccentrically in the cylindrical bearing section 23. According to the present embodiment, the lever 21 also has a projection (Fortsatz) 30 on which the force-measuring means 18 is hinged in the hinge point 31. This in turn produces a two-armed lever 21 with a first lever arm 21a which is located substantially in the bearing section 23 and a second lever arm 21b which is currently located substantially in the region of the projection 30. The length L1 of the first lever arm 21a is again obtained here as the shortest distance from the pivot point 31 of the deflecting element 17 to the pivot point 19. The length L2 of the second lever arm 21b is derived in a similar manner from the shortest distance between the pivot point 31 and the pivot point 19 of the force measuring means 18. The length L1 of the first lever arm 21a is advantageously again very small compared to the length L2 of the second lever arm 21 b.

Fig. 5 shows another possible embodiment in a sectional view. The cylindrical bearing section 23 of the lever 21 is designed as a bearing sleeve, which is fastened to the lever 21 on one of its end sides, for example, with screws, not shown. The other end face of the bearing sleeve has, for example, a thrust shoulder which is fixed or likewise screwed to the bearing sleeve and serves to guide the bearing section 23 in the axial direction in the machine frame 20.

The bearing segments 23 and the bearing structure of the deflecting element 17 of the above-mentioned embodiments are rotatably mounted in both slide bearings and rolling bearings.

However, the use of spherical ball bearings is particularly advantageous for mounting the deflection element 17 in the cylindrical bearing section 23, since a deflection of the deflection element 17 relative to the lever 21 or relative to the frame 20 can thereby be compensated for, but a detailed illustration of these mounting structures is omitted from the figures.

The lever 21 can of course also be designed in other ways. In the present case, therefore, the bearing section 23 is arranged on the end of the lever 21 and the lever 21 also has a projection 30. However, it is also conceivable for the projection 30 to extend on both sides of the bearing section 23 or for the lever 21 to be designed without the projection 30, so that this lever is formed substantially from the cylindrical bearing section 23. In these cases, the hinge point 31 of the force measuring means 18 is likewise arranged eccentrically in the bearing section 23. The lever 21 is in this case designed essentially in the form of a disk.

Fig. 6 shows another embodiment of a measuring device 2 for measuring warp tension, which comprises a yarn deflecting element 22 in addition to the deflecting element 17. As can be seen from fig. 6, the magnitude of the force acting on the force measuring means 18 can be reduced by means of one or more yarn deflection elements 22. The warp threads 5 can be guided by means of one or more such thread deflection elements 22 via the deflection element 17, so that the force F generated by the warp thread force acts on the deflection element 17 with an effective lever arm of length L3, which is smaller than the length L1 of the first lever arm 21. The

lever arms

21a and 21b are covered in fig. 6 as much as possible by the body of the deflection element 17 or of the thread deflection element 22 and are therefore not shown for the sake of clarity.

The yarn deflection element 22 can be embodied as a stationary deflection element or as a stationary deflection roller 12. However, as shown in the present case, the thread deflection element 22 is a component of the backrest 6, which is usually mounted on the weaving machine 1 or on the machine frame 20 so as to be able to oscillate transversely to its longitudinal axis. According to the present embodiment, the rear beam 6 comprises for this purpose a further lever 32 which is articulated on the machine frame 20 by means of a spring 33 and which carries the yarn deflection element 22. It is also known from fig. 6 that the beam 6 and the measuring device 2 for measuring the warp tension are thereafter united into one structural unit, which can thus be arranged on the weaving machine 1 in a simple manner.

Fig. 7 shows as an alternative to the embodiment of fig. 6 also a measuring device 2 for measuring warp tension, which measuring device comprises a yarn deflection element 22 or a back beam 6. The same reference numerals are used here again to designate the same or at least similar features as in fig. 6, so that these features are not explained again separately. Only the differences from fig. 6 will be discussed.

The rear support 6 of fig. 7 does not comprise rotatable and vibratable sweep rollers as the thread deflection element 22, but rather is designed without rollers with a non-rotatable or stationary thread deflection element 22. The thread deflection element 22 is fastened in the machine frame 20 or on a fastening strut 34 connected to the machine frame 20 by means of one or also several elastic supports (halterung) 26. The thread deflection element 22 is therefore likewise able to oscillate transversely to its longitudinal axis, as is indicated by the arrow. The thread deflection element 22 can extend continuously over the entire width of the weaving machine 1 or be continuously as wide as the length of the deflection element 17, for example. Depending on the arrangement of the warp threads 5, however, it is of course also possible for the thread deflecting element 22 to have a shorter length. It is furthermore possible for a plurality of yarn deflection elements 22 to be arranged side by side so as to cover the entire width of the weaving machine 1 or of the warp threads 5.

Fig. 8 shows a weaving machine 1 according to another embodiment, on which the already described measuring device 2 for measuring warp thread tension can be used advantageously. Identical reference numerals are also used here for identical or similar features compared to fig. 1 and only the differences from the embodiment of fig. 1 are explained. The weaving machine 1 of fig. 8 additionally has a further conveying device 3 for conveying warp threads 5. The first conveying device 3 shown below is therefore designed to convey the lower warp threads 29, while the conveying device 3 shown above is designed to convey the warp threads 5 of the upper warp threads 28. Each of the transport devices 3 is assigned its own measuring device 2 for measuring the warp thread tension, which in each case contains a deflection element 17. Furthermore, according to the present illustration, a rear beam is also assigned to each of the transport devices 3 for transporting warp threads. As described above, the rear support 6 can be designed differently and comprise a positively controlled or non-positively oscillating sweep or deflection roller 12 or also only one elastic thread deflection element 22. The measuring device 2 for measuring the warp thread tension with the deflection element 17 can also be designed in different types as described above and here also combined with the backrest 6 as shown in fig. 6 and 7 to form a structural unit.

It is particularly advantageous here if the measuring device 2 for measuring the warp tension of the upper warp threads 28 comprises a lever 21 with a cylindrical bearing section 23, as is shown in fig. 4. This achieves an advantageous accommodation of the deflecting element 17 and an arrangement with respect to the warp beam 4, in particular on the upper warp threads 28. On the lower warp yarn 29, it is particularly advantageous if the measuring device 2 for measuring the warp yarn tension has a lever 21 with a first and a

second lever arm

21a, 21b, as shown in fig. 2. Such a lever in turn allows a simple accommodation and support of the steering element 17, as can be seen from fig. 2.

The invention is not limited to the embodiments shown. Other modifications and combinations within the scope of the patent claims also belong to the invention.

List of reference numerals

1 weaving machine

2 measuring device for measuring warp tension

3 conveying device for conveying warp yarns

4 warp beam

5 warp yarn

6 rear beam

Warp yarn monitor

8-shed forming device

9 loom reed

10 interlacing points

11 shed

12 turning roll

13 draw-in roller

14 cloth roller

15 driver

16 control unit

17 steering element

17a first end of the deflecting element

17b second end of the steering element

18 force measuring mechanism

19 point of rotation

20 frame

21 lever

21a first lever arm

21b second lever arm

22 yarn diverting member

23 bearing section

24 accommodating part

25 bearing bore

26 support

27 bearing cap

28 upper warp yarn

29 lower warp

30 projection

31 hinge point

32 another lever

33 spring

34 fixed support

35 main drive for loom

L1 first Lever arm Length

L2 second Lever arm Length

Length of lever arm effective for L3

KR warp

Force F

Claims

1. Measuring device (2) for measuring the warp tension in a weaving machine (1), with: a measuring element configured as a deflection element (17) having two ends (17 a, 17 b) by which warp threads (5) of the weaving machine (1) can be guided; a force measuring mechanism (18); and a lever (21) which is mounted on a frame (20) of the weaving machine (1) so as to be rotatable about a fixed rotation point (19), by means of which lever the force-measuring means (18) can be acted upon by the measuring element, characterized in that the deflection element (17) is mounted with one of its two ends (17 a, 17 b) on the lever (21) and with the other of its two ends (17 a, 17 b) on the frame (20) of the weaving machine (1) so as to be immovable.

2. A measuring device according to claim 1, characterized in that the diverting element (17) is constructed as a rotatable diverting roller (12) for the warp threads (5).

3. Measuring device according to claim 1, characterized in that the deflection element (17) is constructed as a stationary deflection element (17).

4. Measuring device according to one of claims 1 to 3, characterized in that the lever (21) is configured as a two-armed lever (21), wherein a first lever arm (21 a) is connected to the deflection element (17) and a second lever arm (21 b) is connected to the force measuring means (18).

5. Measuring device according to claim 4, wherein the second lever arm (21 b) has a length (L2) which is greater than the length (L1) of the first lever arm (21 a), wherein the length (L2) of the second lever arm (21 b) is at least twice as long as the length (L1) of the first lever arm (21 a).

6. Measuring device according to claim 4, characterized in that the measuring device comprises at least one yarn deflection element (22), by means of which the warp yarns (5) of the weaving machine (1) can be guided through the deflection element (17) in such a way that the effective lever arm length (L3) of the warp yarn force acting on the deflection element (17) is smaller than the length (L1) of the first lever arm (21 a).

7. A measuring device as claimed in any one of claims 1 to 3, characterized in that the lever (21) is fixed at its point of rotation (19) to a frame (20) of the weaving machine (1).

8. Measuring device according to one of claims 1 to 3, characterized in that the lever (21) comprises a cylindrical bearing section (23) which is formed on one of its ends and by means of which the lever is rotatably mounted on a cylindrical receptacle (24) of the machine frame (20).

9. Measuring device according to claim 8, characterized in that the bearing section (23) of the lever (21) is designed as a cylindrical collar and the receptacle (24) of the frame (20) is designed as a cylindrical recess, and the cylindrical collar is supported with its outer circumference in the recess.

10. Measuring device according to claim 8, characterized in that the cylindrical bearing section (23) of the lever (21) is designed as a bearing sleeve which is fastened to the lever (21) on one of its end sides and has a thrust shoulder on the other end side.

11. A measuring device according to claim 8, characterized in that the cylindrical bearing section (23) has an eccentrically arranged bearing bore (25) in which the deflecting element (17) is supported.

12. A measuring device according to claim 5, characterized in that the length (L2) of the second lever arm (21 b) is at least 3 times as long as the length (L1) of the first lever arm (21 a).

13. Weaving machine (1) with a machine frame (20) with at least one conveying device (3) for conveying warp threads (5) and with at least one measuring device (2) for measuring warp thread tension according to one of the preceding claims, which is arranged downstream of the conveying device (3) for conveying warp threads (5) in the warp direction and comprises a deflection element (17) as measuring element.

14. Weaving machine according to claim 13, characterized in that the weaving machine (1) comprises an oscillatingly movable or vibratable back beam (6) which is arranged along the warp run after a deflection element (17) of the measuring device (2) for measuring the warp tension.

15. Weaving machine according to claim 14, characterized in that the backrest (6) is constructed without rollers with at least one yarn deflection element (22) extending transversely to the warp direction of the weaving machine (1).

16. Weaving machine according to claim 15, characterized in that the at least one yarn deflection element (22) is designed as a resilient deflection plate and/or the at least one yarn deflection element (22) is fastened to the machine frame (20) and/or to a fastening strut (34) connected to the machine frame (20) by means of at least one resilient support (26).

17. Weaving machine according to any one of claims 13 to 16, characterized in that the measuring device (2) for measuring the warp tension comprises a lever (21) with a cylindrical bearing section (23), by means of which the lever (21) is rotatably supported in a cylindrical receptacle (24) of the machine frame (20), and in that the cylindrical bearing section comprises an eccentrically arranged bearing bore (25) for supporting the deflection element (17).

18. Weaving machine according to claim 17, characterized in that the conveying device (3) for conveying the warp threads (5) is configured for conveying the upper warp threads (28).

19. Weaving machine according to claim 18, characterized in that the weaving machine (1) comprises a further conveying device (3) for conveying warp yarns (5), which is configured for conveying a lower warp yarn (29) and for which a further measuring device (2) for measuring the warp yarn tension is assigned.