EP0291730B1 - Verfahren und Vorrichtung zur Messung der Schussfadenlage und zum Richten der Schussfäden in Geweben - Google Patents

Verfahren und Vorrichtung zur Messung der Schussfadenlage und zum Richten der Schussfäden in Geweben Download PDF

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Publication number
EP0291730B1
EP0291730B1 EP88106604A EP88106604A EP0291730B1 EP 0291730 B1 EP0291730 B1 EP 0291730B1 EP 88106604 A EP88106604 A EP 88106604A EP 88106604 A EP88106604 A EP 88106604A EP 0291730 B1 EP0291730 B1 EP 0291730B1
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EP
European Patent Office
Prior art keywords
tensile force
fabric
straightening
fabric length
devices
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88106604A
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German (de)
English (en)
French (fr)
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EP0291730A3 (en
EP0291730A2 (de
Inventor
Hellmut Dr.-Ing. Beckstein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahlo GmbH and Co KG
Original Assignee
Mahlo GmbH and Co KG
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Publication date
Application filed by Mahlo GmbH and Co KG filed Critical Mahlo GmbH and Co KG
Publication of EP0291730A2 publication Critical patent/EP0291730A2/de
Publication of EP0291730A3 publication Critical patent/EP0291730A3/de
Application granted granted Critical
Publication of EP0291730B1 publication Critical patent/EP0291730B1/de
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Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06H—MARKING, INSPECTING, SEAMING OR SEVERING TEXTILE MATERIALS
    • D06H3/00—Inspecting textile materials
    • D06H3/12—Detecting or automatically correcting errors in the position of weft threads in woven fabrics

Definitions

  • the invention relates to a method according to the preamble of patent claims 1 or 2 and to an apparatus for carrying out the method according to the preamble of patent claims 5 or 6.
  • Optical devices are known for measuring the draft angle, in which e.g. a light source shines through the running textile web.
  • the transmission pattern is converted into electrical signals, whereupon the signals determine the angular course of the weft thread.
  • This trailing wheel F follows the "track" of the warp threads 6, so that in the case shown in FIG. 2 the angular position of the trailing wheel F (which can be scanned, for example, by a potentiometer) provides information about the draft angle a, that is to say the oblique position of the weft threads 7 to the Warp threads 6 allowed.
  • a disadvantage of this method is that the sensitivity of the arrangement to the draft angle a to be measured is relatively low, but relatively large to interference.
  • the present invention is based on the object of developing methods and apparatus of the type mentioned at the outset such that an exact mechanical scanning of the weft thread course or draft angle and a corresponding alignment is made possible with simple means.
  • the second possibility of solving the above-mentioned task revolves around the fact that the forward or backward driving forces exerted by the tensioning on moving conveyors are measured in the event of a delay and are used as the basis for the subsequent straightening process. If you only use two tensioning devices on the edges of the goods, you can detect and compensate for an inclined distortion. But it is here too (as with the above-mentioned solution) it is possible to provide a large number of tensioning devices arranged over the width of the goods, so that the direction of warping is detected over the entire width of the goods and thus even garland distortions can be determined and compensated for.
  • a clamping field with very short chain links is used.
  • the chain is not drawn exactly, but only the path covered by the chain links or the running track for the chain.
  • the running rail is divided into many short pieces that are equipped with force sensors. The arrangement is such that the force components perpendicular to the running direction (indicated by an arrow) of the web 1 are detected.
  • the goods are stretched over a very short distance, that is to say approximately point-shaped, via a train introduction device 20.
  • the train introduction device 20 is designed as an outward curvature of the running rail.
  • the force sensors thus together form a force sensor F, which is arranged symmetrically to the tensile force introduction device 20 in the weft thread direction S.
  • the single sensor element Fe absorbs the greatest force at which the weft thread drawn at point W ends.
  • An alternative evaluation arises if the individual sensor elements Fe are divided into two groups F1 and F2. If, in this evaluation, the main direction of force corresponding to the weft course lies exactly in the desired weft direction S (see arrows in FIG.
  • the forces acting on the groups F1 and F2 of the sensor F are also distributed symmetrically be so that a differential measurement of the forces occurring (the output signal of the first sensor is subtracted from the output signal of the last sensor, etc.) gives the initial value zero.
  • the sensors at one end of the sensor F will detect a higher tensile force than those at the other end, so that the difference value is not equal to zero.
  • the straightening chains 10, 10 ' can now be driven at different speeds until the difference value becomes zero again. The tissue can thus be precisely aligned.
  • the tensile force is introduced via a force generator which is intermittently plucking or continuously pulling, for example a friction wheel or a web guide 20, while the force measurement is applied to it by opposing web guides or the like 10 'and 10 "
  • the web guideways or the like ensure, through their (variable, adaptable) inclination, that the weft threads are pulled outwards at the point of attack of the guide 20. If the weft thread is straight, it is arranged opposite the two Web guide or the like 10 'and 10 "force applied equal, the difference is zero. However, if the force of the web guide 10 'is greater than that of the web guide 10 ", this indicates the direction of warpage and suitable evaluation of the result also their size.
  • An arrangement of four or even more force transducers, friction wheels, web guides or the like along an edge with respective force sensors is selected in a further preferred embodiment of the invention, in order thereby to achieve a correspondingly higher resolution with improved angle proportionality evaluation.
  • FIG. 5 a completely symmetrical arrangement has been made, whereby, however, one pulling force introducing device 20 pulls the weft thread as in the exemplary embodiment according to FIG. 3, while the other “pulling force” introducing device 20 'has a reduction caused by the tensioning means 10, 101 already existing in the web 1 tensile force (point).
  • four (individual) force sensors F1, F2 or F1 ', F2' are provided, which, of course, can in themselves be fields of several individual sensors.
  • the individual sensors / groups can be arranged in a bridge circuit. In the case of a weft direction along the arrows a in FIG.
  • the output signal of the sensor F1 decreases compared to the zero value (when the draft angle is zero), while the output value of the sensor F2 'increases. If the draft angle runs in the other direction, the same applies to sensors F2 and F1 '.
  • the fact that the sensors can be arranged in a bridge circuit results in an increased sensitivity of the arrangement and a certain linearization of the output values.
  • the tensile force introduction device 20 can be designed as a wheel or “grinder”, which presses onto the fabric web 1 from above and thus initiates a tensile force, since the fabric web 1 is held at its edges between the straightening elements 10, 10 ' . If in this case the tensile force introduction device 20 is arranged in the middle of the web 1, then not only oblique but also arch distortion can be detected at the two edges by means of two sensing devices F, F '. If, on the other hand, one arranges the tensile force introduction device 20 at one edge of a web 1, then a single sensor arrangement F on the opposite edge of the goods can measure an oblique distortion (broken lines).
  • a sensing device can consist of two track sections 14 and 14 ', which are each supported at their ends on a force sensor F1, F1' or F2, F2 ' .
  • the tensile force introduction device 20 is again arranged opposite the sensor device (symmetrical to this). With this arrangement, there are two maximum values depending on the direction of the warping if the two pairs of sensors F1, F1 'and F2, F2' are operated in a differential circuit. The distortion angle can then be derived in both directions from these values.
  • FIG. 9 shows a third embodiment, in which a (inherently rigid) rail 14 is used, which is suspended on a torque sensor F so that it can rotate about its center. If the measured torque approaches zero, the draft angle (with a corresponding arrangement of the traction force introduction device 20) is also zero.
  • tractive force can not be static, but also dynamic. This means that a force is applied intermittently, that is, as a vibration, and the output signals of the force sensors are sampled via a controlled rectifier (lock-in amplifier), the control being carried out via the vibration frequency. In this way, a significant increase in the signal-to-noise ratio is possible.
  • the embodiment shown in FIG. 10 is the second alternative for problem solving. If the fabric web 1 is run over two friction or needle wheels 10, 10 ', the axes of rotation of which form an obtuse angle with one another, then the fabric is stretched between the wheels 10, 10'. If there is a warp, so the weft threads do not run in the desired direction, the force K1 (FIG. 11) in the weft thread direction results in a force component K3 parallel to the axis of rotation, which is absorbed via the bearings of the wheels 10, 10 ', and a propelling one or driving force component K2.
  • the wheels 10, 10 ' are provided with torque sensors F, F', from whose output values the force component K2 can be derived. From the difference between the torques or force components K2 measured via the sensors F, P, a measure of the inclined distortion of the web 1 can be derived.
  • the wheels are replaced by chains 12 which are guided in a triangular path via rollers or rollers 11, 11 ', 11'.
  • the chains 12 are provided with needles 13 or can have an adhesive material as a coating, so that when two such tensioning devices 10, 10 'are inclined relative to one another, a tensile force can be applied to the fabric.
  • the distortion can then be measured particularly trouble-free if the lowest possible forces in the conveying direction have to be taken into account.
  • the arrangement shown in FIG. 13 takes this into account.
  • a corresponding scanning known per se
  • the preferred embodiment of the invention shown in FIG. 14 is a conventional tensioning frame (possibly already existing in an operation) with tensioning chains 10, 10 '.
  • a tensile force introduction device 20 is either attached in the center or on one of the edges (shown with broken lines).
  • two sensing devices F, F ' are provided, and in the case of an edge-sided tensile force introduction device 2o, only one sensing device F. Otherwise, the above statements made with regard to FIG. 6 apply here.
  • a skew and / or curve distortion can be detected via the measuring devices.
  • a straightening roller 3 is provided in front of the inlet of the arrangement shown in FIG. 14 and is pivotally mounted (see arrows).
  • the roller 3 (or an additional roller 3) can be provided to compensate for bow distortion, that is to say a roller whose thickness (crowning) can be adjusted. In this way, the delays detected with the measuring arrangement can be corrected.
  • a further correction of inclined distortions can be corrected to a corresponding chain 10 'to chain 10'.
  • the measuring arrangement in the outlet area of the device can detect sheet warping, the draw-off roller 4 being able to be controlled accordingly via its motor M1 to compensate for the sheet distortion, so that the draw-off roller 4 is accelerated when the sheet is lagging.
  • the fabric web 1 is guided between two chains 10, 10 'of a tensioning frame similar to the arrangement according to FIG. 6, sensors F1, F2 or F1', F2 'on the chains 10, 10' in a symmetrical arrangement similar to that according to FIG 5 are provided.
  • sensors F1, F2 or F1', F2 'on the chains 10, 10' in a symmetrical arrangement similar to that according to FIG 5 are provided.
  • On the line of symmetry (at right angles to the direction of transport) a plurality of tensile force introduction devices 20 1 to 20n are arranged, wherein these tensile force introduction devices can apply the tensile force as a vibration with an adjustable frequency f1 to fn.
  • An oscillator 24 is provided to feed the tensile force introduction devices, whose output signal f1 is divided down to frequencies f2 to fn via dividers 23. 16, each of the traction force introduction devices 20 1 to 20n is fed via a power amplifier 25 at a frequency f1 to fn. These frequencies continue to be supplied to the lock-in amplifiers 22 1 to 22 n as a reference frequency.
  • the lock-in amplifier 22 1 to 22 n act as a narrow-band filter, so that the output signals Ua1 to Uan can be directly assigned to the forces applied by the tensile force introduction devices 2oi to 20 n , so that each Output signal Ua1 to Uan represents the weft course at the location of the respective force introduction by the tensile force introduction devices 20 1 to 2on.
  • a garland distortion can be determined.
  • FIGS. 17 and 18 A further preferred embodiment of the invention, which is based on the same idea as the arrangements described above, is shown schematically in FIGS. 17 and 18.
  • a tensile force introduction device 20 is provided, which (like the tensile force introduction devices according to FIGS. 15 and 16) also applies the tensile force in an oscillating manner to a fabric web 1.
  • an electrodynamic oscillator 27 is provided, the stamp 26 of which rests on the fabric web 1.
  • sensors F1 to F2 'are arranged FIG. 18
  • the measuring amplifier can also be a lock-in amplifier, the reference frequency of which corresponds to the feed frequency of the electrodynamic oscillator 27.
  • a conventional bandpass filter can also be provided instead of a lock-in amplifier, the pass frequency of which is matched to the feed frequency of the electrodynamic oscillator 27.
  • This arrangement can thus be designed as a "compact device” which can be arranged at any point on a guided fabric web 1.
  • the introduction of the tensile force in the form of an oscillation has the advantage that a high accuracy can be achieved due to a high signal-to-noise ratio via the selective signal detection.
  • FIGS. 19 to 21 A further preferred embodiment of the invention, the principle of which is similar to that of the embodiment according to FIGS. 17/18, is shown in FIGS. 19 to 21.
  • a closed housing 31 which can be supplied with compressed air via a compressed air connection 33.
  • the housing 31 has a substantially cylindrical design.
  • housing bores 34 are made symmetrically to the center point.
  • At the center of the housing base 32 is a plane over the level of the housing base 32 projecting sensor F positioned, which can be placed on a fabric web 1.
  • An electric motor 28 is provided concentrically in the housing 31, on the shaft 29 of which a perforated disk 30 is seated.
  • the perforated disk 30 is provided with bores 35, the distance of which from the axis of rotation defined by the shaft 29 is equal to the distance from the housing bores 34 to the center of the housing 31.
  • the disc 30 is arranged just above the inner surface of the housing base 32, so that compressed air, which is introduced through the compressed air connection 33 into the housing 31, can only escape from the housing bores 34 if the bores 35 in the perforated disc 30 with the bores 34 in the housing bottom 32 are aligned.
  • Two diametrically arranged bores 35 are provided in the perforated disk 30, while a total of four bores are provided in a symmetrical arrangement in the housing base 32 (see FIGS. 20/21).
  • the fabric web 1 is blown periodically between the diametrically opposed pairs of bores 34 in the housing base 32.
  • the tissue is therefore stretched alternately in two directions, each with the same force amplitudes, the transmission of the voltage introduced being able to be measured via the sensor F.
  • the rotational position of the electric motor 28 which can be ensured on the electric motor 28 by means of a rotary encoder or the like, it is thus possible to determine the weft thread course at the point of attachment of the sensor F.
  • This arrangement like the arrangement according to FIGS. 17 and 18, can also be placed on a spread-out fabric web 1 at any point.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
EP88106604A 1987-05-18 1988-04-25 Verfahren und Vorrichtung zur Messung der Schussfadenlage und zum Richten der Schussfäden in Geweben Expired - Lifetime EP0291730B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3716579A DE3716579C1 (el) 1987-05-18 1987-05-18
DE3716579 1987-05-18

Publications (3)

Publication Number Publication Date
EP0291730A2 EP0291730A2 (de) 1988-11-23
EP0291730A3 EP0291730A3 (en) 1988-12-28
EP0291730B1 true EP0291730B1 (de) 1990-04-18

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ID=6327779

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Application Number Title Priority Date Filing Date
EP88106604A Expired - Lifetime EP0291730B1 (de) 1987-05-18 1988-04-25 Verfahren und Vorrichtung zur Messung der Schussfadenlage und zum Richten der Schussfäden in Geweben

Country Status (4)

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EP (1) EP0291730B1 (el)
JP (1) JPS63309670A (el)
DE (2) DE3716579C1 (el)
ES (1) ES2014336B3 (el)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002266231A (ja) * 2001-03-07 2002-09-18 Seiren Denshi Kk 拡布式布目矯正機
DE202006007586U1 (de) * 2006-01-24 2006-08-17 Brückner Trockentechnik GmbH & Co. KG Vorrichtung zum Richten textiler Materialbahnen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2795029A (en) * 1954-06-25 1957-06-11 Robertson Co H H Skew detecting method and apparatus
NL125706C (el) * 1965-06-29
IT1110219B (it) * 1979-02-28 1985-12-23 Rdb Spa Procedimento per variare l'inclinazione di una serie di fili rispetto all'altra serie di fili in un elemento a struttura reticolare;estruso,in materiale plastico
DE3473482D1 (en) * 1983-09-05 1988-09-22 Shoji Senba Weft straightener

Also Published As

Publication number Publication date
EP0291730A3 (en) 1988-12-28
EP0291730A2 (de) 1988-11-23
ES2014336B3 (es) 1990-07-01
JPS63309670A (ja) 1988-12-16
DE3716579C1 (el) 1989-02-02
DE3860090D1 (de) 1990-05-23

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