Classifications

• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
  • D03D49/04—Control of the tension in warp or cloth
  • D03D49/12—Controlling warp tension by means other than let-off mechanisms
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
  • D03D49/04—Control of the tension in warp or cloth
  • D03D49/18—Devices for indicating warp tension

Definitions

• the present invention relates to a device for measuring the
• the device comprises a force-measuring device and a lever mounted rotatably about a stationary pivot point on a machine frame of the weaving machine, via which the force-measuring device can be acted upon by the measuring element.
• the invention relates to a corresponding loom with such a device.
• Warp tension sensors are used in weaving machines in order to maintain a uniform warp tension required during the weaving process for uniform fabric formation and especially for avoiding warp breakage.
• the control or regulation of the warp tension is usually carried out by a corresponding drivable Kettablass which regulates the warp tension on the weaving machine control according to the signals of the warp tension sensor.
• Warp tension periodically moves during the tray change, which can be achieved passively by a resilient mounting of the coating tree or active by a corresponding drive of the coating tree. On- Because of its oscillatory bearing such a bowing tree is particularly well suited to detect changes in the warp tension.
• a warp tension sensor with an arcuately movable or oscillating spreading beam transverse to its longitudinal axis is described, for example, in EP 2 584 079 A1.
• the oscillatable bowing tree is connected via a lever with a force measuring device, which in turn is fixedly arranged on a machine frame.
• the forces that act on the string tree through the warp threads are transferred to the force measuring device via the lever.
• a disadvantage of this design is that due to the warp yarns running over the coating tree and due to repercussions of the weaving process, vibrations occur at the coating roll and thus also at the force measuring device, which can falsify the measurement result.
• it is due to the considerable forces acting on the warp on the warp tree, required to perform this comparatively massive, which also complicates an accurate measurement of the warp tension due to the resulting higher inertia.
• Object of the present invention is therefore to propose a device for measuring the warp tension in a loom which allows a more accurate measurement. Furthermore, a corresponding loom to be proposed with such a device.
• a device for measuring the warp tension in a weaving machine having a two-ended, formed as a deflecting measuring element over which warp threads of the loom are feasible has a force measuring device and a rotatably mounted about a stationary pivot on a machine frame of the loom lever on which the Force measuring device can be acted upon by the measuring element. It is envisaged that the deflecting element with one of its two ends is mounted in the lever and is immovably mounted on the machine frame with the other end. Characterized in that the deflecting element is mounted with its one end on the lever, it is also mounted at this end movable on the machine frame.
• the deflection element is movable within the machine frame so that changes in the warp tension can be registered by the force measuring device.
• the deflecting element is not capable of oscillating, but mounted firmly on the machine frame, which leads to a much cleaner measuring signal.
• the measurement results obtained can therefore be utilized much better and a chain tension advantageous for the weaving process can be kept constant.
• An advantage of this embodiment it is further that due to the one-sided fixed mounting of the deflecting element in the machine frame, a part of the occurring warp forces can be derived directly on the machine frame and only a part of the forces is passed through the force measuring device. The accuracy of the measurement results is thereby further improved. At the same time the components of the device for measuring the warp tension are thereby exposed to lower loads.
• the machine frame includes the entire frame of the loom and can be composed of several components that form the basis for the cultivation of various functional groups of the loom.
• a weaving machine with a machine frame, with at least one device for feeding warp threads and with at least one in the warp direction of the device for supplying warp threads downstream, comprising a deflection element as a measuring element device for measuring the warp tension.
• the device for measuring the warp tension is as described above provided with a deflection element as a measuring element, which is mounted with one of its two ends fixed to the machine frame and with the other of its two ends is mounted on the lever. Since the deflecting element according to the present invention is not vibrationally mounted on the machine frame, oscillations of the loom and the measuring element itself affect the measurement result to a much lesser extent than previously, so that the warp tension can be regulated more accurately.
• the deflection element is designed as a rotatable deflection roller for the warp threads. Due to its rotatability, the surface of the guide roller can follow the movement of the warp threads in the warp direction, so that less frictional forces between the warp threads and the guide roller occur.
• An advantage of such a fixed deflection element is that this can be structurally simple and compact and therefore can be used even in confined spaces.
• the lever is fixed in its pivot point on the machine frame of the loom. Such attachment of the lever can be executed in a structurally simple manner.
• the lever is designed as a two-armed lever, wherein a first lever arm is connected to the deflection element and a second lever arm is connected to the force measuring device.
• the force measuring device is advantageously designed for measuring tensile forces with strain gauges and connected at one end to the second lever arm, while it is fixed with its other end fixed to the machine frame.
• the lever can also be formed as a one-armed lever, in which case preferably the force measuring device is articulated to the end of the lever and the measuring element or the deflecting element between the pivot point and the end of the lever to an advantageous reduction of the forces acting on the force measuring device to achieve.
• the second lever arm has a length which is greater than the length of the first lever arm.
• the size of the force component acting on the force measuring device can thereby be further reduced.
• the length of the second lever arm is at least twice as long, more preferably at least three times as long, as the length of the first lever arm.
• the length of the lever arms is determined by the shortest distance between the respective articulation points of the deflecting element and the force measuring device to the pivot point of the lever.
• the device comprises at least one thread deflecting element by means of which the warp threads of the weaving machine can be guided via the deflecting element such that the length of an effective lever arm of warp forces acting on the deflecting element is less than the length of the first lever arm.
• the shortest distance between the force resulting from the warp tension on the deflecting element and the pivot point of the lever is understood as the effective lever arm.
• the device for measuring the warp tension is therefore also suitable for weaving machines in which very high warp forces of 50 kN and above occur. Nevertheless, very accurate results are obtained.
• the Fadenumlenkelement can be formed both by an already existing deflection roller or it can be arranged as an additional Fadenumlenkelement Kettfadenverlauf. Furthermore, the Fadenumlenkelement can also be an already existing on the weaving machine stringing.
• the lever is not fixed as described above directly in its fulcrum on the machine frame, but it has a cylindrical bearing portion by means of which it is rotatably mounted on a cylindrical receptacle of the machine frame.
• the pivot point of the lever is thereby located in the center of the cylindrical bearing portion, while the attachment takes place over the circumference of the cylindrical bearing portion.
• a lever with a cylindrical bearing portion may be formed both as a one-armed and as a two-armed lever and also cooperate with a Fadenumlenkelement as described above.
• bearing portion of the lever is designed as a cylindrical projection and the inclusion of the machine frame as a cylindrical recess is particularly advantageous.
• the cylindrical projection is then mounted with its outer periphery in the recess of the machine frame.
• cylindrical bearing portion of the lever is designed as a bearing bush, which is attached to one of its end faces, for example with screws on the lever.
• the other end face of the bushing has, for example, a fixed or likewise bolted to the bearing bush run-in collar, which serves to guide the bearing portion in the axial direction in the machine frame.
• bearing sections of the embodiments listed above can be rotatably mounted both in plain bearings and in rolling bearings relative to the machine frame.
• a particularly compact construction of such a lever can be achieved if the cylindrical bearing section has an eccentric arrangement. Neten bearing bore, in which the deflecting element is mounted.
• the length of the first lever arm thus results as a distance between the pivot point or the center of the cylindrical bearing portion and the center of the eccentrically arranged bearing bore. It is possible with such a lever to influence the length of the lever arm, which is connected to the deflecting element, and thereby to reduce the warp forces acting on the measuring element.
• the lever with the cylindrical bearing portion or the machine frame with the cylindrical receptacle allows easy installation.
• the bearing of the deflecting element in the eccentrically arranged bearing bore takes place, for example, in conventional cylindrical sliding or rolling bearings.
• a spherical spherical bearing which can compensate for deflections of the deflecting element relative to the lever or relative to the machine frame.
• the weaving machine comprises an arcuately movable or oscillatable spreading beam transversely to its axis, which is preferably arranged in the warp path after the deflecting element of the device for measuring the warp tension.
• the coating tree is usually used to compensate for tensile force changes of the warp threads and the deflection of the warp threads. If the coating beam is arranged after the deflecting element of the device for measuring the warp tension, this can additionally serve advantageously to reduce the forces acting on the deflecting element. In principle, however, it is also possible to arrange the coating tree already in front of the deflecting element of the device for measuring the warp tension.
• the coating tree is formed without rollers with at least one, extending transversely to the warp direction of the loom Fadenumlenkelement.
• a Fadenumlenkelement can in contrast to a conventional vibrating coating roll with a low mass and a high natural frequency are formed so that it is hardly excited even to vibrations and therefore only slightly loaded the warp threads.
• the loom can also be provided with a conventional, either positively controlled or casually controlled oscillating bow tree.
• the at least one yarn deflection element is designed as a deflection plate.
• a baffle can be made with a low mass.
• the baffle itself can be resiliently designed to allow the compensation of the warp thread tensions.
• the thread deflecting element can be fastened with a resilient mounting on the machine frame and / or on a fastening strut connected thereto.
• the resilient mount may be formed, for example, as a leaf spring and thereby in turn allow the movement of the Fadenumlenkelements.
• the Fadenumlenkelement can of course be designed as a rigid deflecting element, for example as a rod in such a resilient mounting or attachment with a resilient support.
• EP 2 126 173 B1 shows a bowing tree with a thread deflecting element mounted by means of a resilient mount.
• other versions of brushwood are conceivable.
• the loom has a device for measuring the warp tension, which comprises a lever with a cylindrical bearing portion, 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 deflecting element.
• the device described is arranged with the lever with the cylindrical bearing portion on a device for measuring the warp tension of a top chain is particularly advantageous. Especially in connection with a device arranged above the weaving level for feeding warp threads for the upper chain, the assembly of the device on the weaving machine can thereby be facilitated.
• a particularly advantageous development of the weaving machine described further comprises a preferably arranged below the weaving level device for feeding warp threads, which is designed for supplying a lower chain. This is also associated with a device for measuring the warp tension.
• Figure 1 is a schematic side view of a loom with a
• FIG. 2 shows a schematic side view of a device for measuring the warp tension
• FIG. 3 a schematic representation of a bearing of a deflecting element of a device for measuring the warp tension
• FIG. 4 shows a schematic side view of a device for measuring the warp tension in an alternative embodiment
• Figure 5 shows a part of a machine frame with a receptacle for a lever in an alternative embodiment in cross section
• FIG. 6 shows a further embodiment of a device for measuring the
• Warp tension with a thread deflecting element in a schematic, sectional side view
• Figure 7 shows another embodiment of a device for measuring the
• Warp tension with a Fadenumlenkelement in a sectional side view as well
• Figure 8 is a schematic representation of a loom with a
• FIG. 1 shows a schematic side view of a loom 1, which is equipped with a device 2 for measuring the warp tension.
• the warp threads 5 are unwound in the usual way by a warp beam 4 of a device 3 for feeding warp threads and in the warp direction KR (see arrow) successively fed via the device 2 for measuring the warp tension, a coating tree 6, and Kettfadenwumbleter 7 the shedding means 8 which in the usual way oscillating and counter to each other are movable to form the shed 1 1.
• the coating tree has a deflecting element 22 and can be designed in various ways, as will be explained with reference to the following figures. Not shown are weft insertion means, which may be formed in various ways and are well known in the art.
• the finished fabric is pulled off at the end of the loom 1 opposite the warp beam 4 by means of a draw-in roller 13 and placed on a cloth beam 14. wound.
• a plurality of deflecting rollers 12 can be seen in the area of the drawing-in roller 13 or of the cloth beam 14.
• the weaving machine 1 further comprises a drive 15 for the warp beam 4 in order to control the warp let-off selectively, as well as a further drive 15 for the controlled drive of the draw-in roll 13.
• the reed 9 is connected to a main drive 35 of the weaving machine 1.
• the weaving machine 1 a control unit 16, by means of which sensor data can be detected or drives can be controlled to ensure the trouble-free operation of the loom and to allow the production of a uniform tissue.
• the devices mentioned are connected by means of signal-transmitting lines to the controller 16 of the loom 1, as indicated by the dotted lines. Furthermore, the outlines of a machine frame 20 are shown schematically.
• the device 2 for measuring the warp tension includes, in a manner known per se, a deflecting element 17, which can be acted upon by the tension of the warp threads 5 and is connected to a force measuring device (18, see FIGS. 2 and 4) in order to be able to measure the warp tension.
• the information about the warp tension (tension) of the warp threads 5 is also transmitted via a signal transmitting line (dash-dotted line) to the control unit 16 of the loom 1, which in turn drives the drive 15 of the warp beam 4 accordingly to cause a tension change of the warp threads 5.
• FIG. 2 shows a schematic representation of a device 2 for measuring the warp tension in a side view.
• the device 2 comprises a deflecting element 17 which has two ends 17a and 17b (see FIG. 3) and via which warp threads 5 (not shown here) of the loom 1 can be guided.
• the deflecting element 17 is mounted by means of a lever 21 in the machine frame 20 of the loom 1 such that the lever 21 voltage changes of the warp threads 5 can be transmitted to a Kraftmessein- device 18.
• the force measuring device 18 is preferably designed for measuring tensile stresses and has strain gauges, for example.
• the force measuring device 18 is, as already described in Figure 1, signal transmitting connected to the control unit 16, as indicated by the dashed line.
• the device 2 for measuring the warp tension thus corresponds to previously known devices 2.
• the deflecting element 17 is not designed as a swinging stringing tree, but at least partially rigidly on the machine frame 20 stored, of which only a part is shown in a broken view here.
• the machine frame 20 includes the entire frame of the loom 1 and can be composed of several components that form the basis for the cultivation of various functional groups of the loom.
• the deflection element 17 is mounted with its first end 17a on the machine frame 20 via the lever 21.
• FIG. 3 shows another part of the machine frame 20 in also aborted representation. Furthermore, the deflecting element 17 can be seen in FIG. 3 in dash-dotted representation, which is mounted with its second end 17b in the illustrated part of the machine frame 20.
• the deflecting element 17 In order to be able to measure the tension of the warp threads 5 by means of the deflecting element 17, the deflecting element 17 is movably mounted with its first end 17a on the machine frame 20, but with its second end 17b mounted fixedly on the machine frame 20.
• the immovable mounting of the deflecting element 17 with its second end 17b on the machine frame 20 is shown in FIG. 3 and can take place, for example, by means of a bearing plate 27.
• the deflecting element 17 At its end 17a opposite the second end 17b, however, the deflecting element 17 is in a movable lever 21 and thus movably mounted on the machine frame 20.
• the lever 21 is presently designed as a two-armed lever 21 and fixed in its pivot point 19 on the machine frame 20.
• the lever 21 in this case has a first lever arm 21 a, in which the deflecting element 17 is mounted and articulated via a pivot point 31, the lever, and a second lever arm 21 b, to which the force measuring device 18 is articulated in a pivot point 31.
• a force F on the deflecting element 17 and thereby on the lever arm 21 a so transmitted through the lever 21 force F can be registered by the force measuring device 18.
• the device 2 is therefore particularly suitable for weaving machines where very high warp forces occur.
• FIGS. 4 and 5 the same reference numerals are used for features that are identical or at least comparable in their design and / or mode of action in comparison to the embodiment illustrated in FIGS. 2 and 3. Unless these are explained again separately, their design and / or mode of action corresponds to the design and mode of action of the features already described with reference to FIGS. 2 and 3.
• FIG. 4 once again shows the machine frame 20, the force-measuring device 18, as well as the outlines of the deflecting element 17 in dot-dashed lines.
• the lever 21 is also present as a two-armed lever 21st formed, but is not fixed in its pivot point 19 on the machine frame 20. Rather, the lever 21 has a cylindrical bearing portion 23, by means of which it is rotatably mounted on a likewise cylindrical receptacle 24 on the machine frame 20.
• the receptacle 24 is formed as a cylindrical recess, while the lever 21 has a cylindrical shoulder or shoulder as a bearing portion 23.
• the receptacle 24 and the bearing portion 23 are hidden in the figure 4 from the front of the lever 21 and therefore shown in phantom.
• the lever 21 is mounted with the outer periphery of its cylindrical projection in the recess of the machine frame.
• the machine frame 20 with the cylindrical projection or shoulder and the lever 21 with the corresponding recess as a bearing section 23. Since the cylindrical bearing portion 23 is rotatable within the cylindrical receptacle 24, now also turn the lever 21 about its pivot point 19, which corresponds to the center of the cylindrical receptacle 24 rotatable.
• the lever 21 furthermore has a bearing bore 25, in which the deflecting element 17 is mounted with its first end 17a.
• the bearing bore 25, the center of which forms the articulation point 31 for the deflecting element 17, is arranged eccentrically in the cylindrical bearing section 23.
• the lever 21 further comprises an extension 30, on which the force measuring device 18 is articulated in a pivot point 31. This in turn results in a two-armed lever 21 with a first lever arm 21 a, which is located substantially within the bearing portion 23, and a second lever arm 21 b, which is present substantially in the region of the extension 30.
• the length L1 of the first lever arm 21 a results
• the length L2 of the second lever arm 21b results in an analogous manner from the shortest distance of the articulation point 31 of the force measuring device 18 and the pivot point 19.
• the length L1 of the first lever arm 21 a substantially smaller than the length L2 of the second lever arm 21 b.
• FIG 5 Another possible embodiment is shown in FIG 5 in a sectional view.
• the cylindrical bearing portion 23 of the lever 21 is designed as a bearing bush, which is attached to one of its end faces, for example with - not shown - screws on the lever 21.
• the other end face of the bushing has, for example, a fixed or likewise bolted to the bearing bush run-in collar, which serves to guide the bearing portion 23 in the axial direction in the machine frame 20.
• the bearing sections 23 and the bearing of the deflecting element 17 of the embodiments listed above can be rotatably mounted both in plain bearings and in rolling bearings.
• the use of a spherical spherical bearing is particularly advantageous because it deflections of the deflecting 17 relative to the lever 21 and against the machine frame 20 can be compensated - on a more detailed presentation of these bearings in the figures but waived.
• the lever 21 can also be configured in another way.
• the bearing section 23 is arranged at the end of the lever 21 and the lever 21 also has an extension 30.
• the articulation point 31 of the force measuring device 18 would also be arranged eccentrically within the bearing section 23.
• the lever 21 would be designed in this case substantially disc-shaped.
• FIG. 6 shows a further embodiment of a device 2 for measuring the warp tension, which comprises a thread deflecting element 22 in addition to the deflection element 17.
• a thread deflecting element 22 in addition to the deflection element 17.
• the warp threads 5 can be guided over the deflection element 17 by means of one or more such thread deflection elements 22, so that the force F resulting from the warp forces 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 21 a and 21 b are largely hidden in Figure 6 by the body of the deflecting elements 17 and the Fadenumlenkelements 22 and therefore not indicated for reasons of clarity.
• the Fadenumlenkelement 22 may be formed as a fixed deflecting element or fixed guide roller 12.
• the thread deflecting element 22 is part of the coating tree 6, which is mounted in the usual manner transversely to its longitudinal axis oscillating on the loom 1 and the machine frame 20.
• the coating tree 6 contains for this purpose a further lever 32, which is articulated via a spring 33 on the machine frame 20 and which carries the Fadenumlenkelement 22.
• the coating beam 6 and the device 2 for measuring the warp tension are combined to form a structural unit, so that they can be arranged in a simple manner on the loom 1.
• FIG. 7 likewise shows a device 2 for measuring the warp tension, which comprises a thread deflecting element 22 or a coating beam 6.
• a device 2 for measuring the warp tension which comprises a thread deflecting element 22 or a coating beam 6.
• the same reference numerals again designate the same or at least comparable features in comparison to FIG. so that they will not be explained again separately. Therefore, only the differences from FIG. 6 will be discussed.
• the coating tree 6 of FIG. 7 does not include a rotatable and oscillatable coating roller as a thread deflecting element 22, but is designed without a roller with a non-rotatable or stationary thread deflecting element 22.
• the thread deflecting 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 more resilient holders 26.
• the Fadenumlenkelement 22 is thus also oscillatable transversely to its longitudinal axis, as indicated by the arrows.
• the Fadenumlenkelement 22 may thereby extend continuously over the entire width of the loom 1 or be continuously about as wide as the deflection element 17 is long.
• the thread deflection element 22 may have a shorter length. Furthermore, it is possible that several Fadenumlenkieri 22 are arranged side by side to cover the entire width of the loom 1 and the warp threads 5.
• FIG. 8 shows a weaving machine 1 according to a further embodiment, to which the described device 2 for measuring the warp tension can advantageously be used.
• the weaving machine 1 of FIG. 8 additionally has a further device 3 for feeding warp threads 5.
• the first device 3 shown in the image below for feeding a lower chain 29 is formed while the device 3 shown in the image above for feeding warp threads 5 of a top chain 28 is formed.
• Each of the devices 3 is associated with its own device 2 for measuring the warp tension, which includes a deflection element 17 each.
• each of the warp yarn feeding apparatuses 3 is a coating tree 6 assigned.
• the coating tree 6 can be designed in various ways and include a positively controlled or casually oscillating coating roller or guide roller 12 or even have only one resilient Fadenumlenkelement 22.
• the devices 2 for measuring the warp tension with the deflecting elements 17 can, as described above, be embodied in various ways and, as shown in FIGS. 6 and 7, also be combined with the coating trees 6 to form a structural unit.
• the device 2 for measuring the warp tension of the upper chain 28 comprises a lever 21 with a cylindrical bearing portion 23, as shown in FIG.
• the device 2 for measuring the warp tension it is especially advantageous for the device 2 for measuring the warp tension to have a lever 21 with a first and a second lever arm 21 a, 21 b, as shown in FIG. This in turn allows in a simple manner the recording and storage of the deflecting element 17, as is apparent from Figure 2.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Looms (AREA)
• Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)

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• 2016
  • 2016-10-20 DE DE102016220546.3A patent/DE102016220546B3/de active Active
• 2017
  • 2017-10-19 CN CN201780064919.9A patent/CN109844198B/zh active Active
  • 2017-10-19 WO PCT/EP2017/076791 patent/WO2018073386A1/de unknown
  • 2017-10-19 EP EP17790740.9A patent/EP3529404B1/de active Active
  • 2017-10-19 JP JP2019521074A patent/JP6938629B2/ja active Active

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