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WO2002088013A1 - Dispositif destine a mesurer la tension d'un fil sur la base d'un principe de mesure photoelastique - Google Patents

Dispositif destine a mesurer la tension d'un fil sur la base d'un principe de mesure photoelastique Download PDF

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Publication number
WO2002088013A1
WO2002088013A1 PCT/EP2002/003691 EP0203691W WO02088013A1 WO 2002088013 A1 WO2002088013 A1 WO 2002088013A1 EP 0203691 W EP0203691 W EP 0203691W WO 02088013 A1 WO02088013 A1 WO 02088013A1
Authority
WO
WIPO (PCT)
Prior art keywords
thread
plate
thread tension
photo
tension meter
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.)
Ceased
Application number
PCT/EP2002/003691
Other languages
German (de)
English (en)
Inventor
Stefano Dr.-Ing. Lamprillo
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.)
Iropa AG
Original Assignee
Iropa AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Iropa AG filed Critical Iropa AG
Publication of WO2002088013A1 publication Critical patent/WO2002088013A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
    • G01L5/10—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
    • G01L5/106—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means for measuring a reaction force applied on a cantilever beam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/40—Applications of tension indicators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
    • G01L5/10—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
    • G01L5/105—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means using electro-optical means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
    • G01L5/10—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
    • G01L5/107—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means for measuring a reaction force applied on an element disposed between two supports, e.g. on a plurality of rollers or gliders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/40—Sensing or detecting means using optical, e.g. photographic, elements
    • B65H2553/41—Photoelectric detectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the invention relates to a thread tension meter according to the preamble of claim 1.
  • Thread tension meters have to provide precise information on the thread tension when the thread is stationary or running from the very small load of the thread deflected at the deflector. From the deformation resulting from the small load of the thread, the thread tension in a thread processing system, e.g. a weaving machine with weft thread delivery devices, despite work-related vibrations and with the thread running, varying frictional influences can be determined accurately.
  • thread tension meters have been developed for this purpose, which work with strain measuring elements or piezoelectric elements, which are analyzed by the evaluation circuit. In order to ensure a clear measurement of the thread tension within a large measuring range and in spite of the influences originating from the thread and the external influences, a high level of electronic and technical equipment is required.
  • the known thread tension meters are expensive and sensitive devices, which are usually installed in large numbers in thread processing systems.
  • strain gauges or piezoelectric elements the phenomenon is used that their materials change their electrical properties under a mechanical load and, via the changes, allow conclusions to be drawn about the load causing the mechanical stress states. For example, the internal electrical resistance or a deformation-induced electrical voltage varies. To derive reasonably usable useful signals, however, high electronic expenditure is necessary.
  • the invention has for its object to provide a structurally simple and reliable, inexpensive to manufacture thread tension meter of another type, which has a large measuring range and can be derived with moderate electronic effort clear output signals.
  • the object is achieved with the features of claim 1.
  • the phenomenon of birefringence of a photo-elastic, deformable element is used to measure the thread tension in a departure from the conventional principle of directly measuring and evaluating the elastic deformation in the transducer device electronically. From the deformation of the photoelastic element, scanning is carried out optoelectronically with polarized light via the change in the refractive behavior on the basis of the intensity of the emerging light, which changes with a change in the internal stress state in the photoelastic element.
  • the photo-elastic element consists of a dielectric material that is transparent and usually at least largely isotropic. This material becomes anisotropic as soon as it is subjected to a mechanical stress condition.
  • the anisotropy induced thereby results in different refractive indices for different lightwave polarization directions with reference to the main stresses inside the element.
  • the voltage condition can be detected via the intensity of the emerging light.
  • An approximately perpendicularly incident light wavefront of polarized light is divided into two waves which propagate at two different speeds in the interior of the element, since there are different refractive indices along the main axes in the element. This results in a phase difference in the emerging light; the element acts like a uniaxial crystal, in which the intensity of the emerging light follows an analytical equation that can be easily derived.
  • the stress conditions in the photo-elastic element can easily be sensed by means of the emerging light by means of its isochromate. Practically over the entire extent of the element, the special arrangement leads to an almost constant phase offset or phase difference, as a result of which the two continuous light waves influence one another.
  • the instantaneous tension conditions in the photo-elastic element can be assessed with little electronic effort within a wide measuring range.
  • the thread tension can be derived precisely from this.
  • the output characteristic is not linear, but square in the first approximation. However, the thread tension can be measured with high precision using suitable, known linearization methods.
  • the thread tension indirectly via the internal tension condition of the elastic element determined by optoelectronic means determined using the effect of photo elasticity or birefringence and supported by the geometric conditions, strong and meaningful useful signals for measuring the thread tension can be achieved. This is done with moderate electronic effort.
  • the mechanical construction of the thread tension meter is simple.
  • the thread tension meter can be produced inexpensively, is insensitive, compact and therefore optimal to install in thread processing systems.
  • the phenomenon of photoelastic material is used, which changes its optical properties under internal tension states caused by the mechanical load of the thread tension and thus enables conclusions to be drawn about the extent of the load and the thread tension.
  • photoelastic material changes its refractive behavior or the ratio between applied and transmitted light with the load when illuminated or fluorinated, for example with polarized light, whereby the geometry of the photoelastic element is also used to derive strong and meaningful output signals within a wide measuring range , Since the output signal varies widely and meaningfully within a wide range and there is a clear relationship between the change in the mechanical stress state and the change in the optical properties, the electronic effort required to evaluate the output signal remains low.
  • the thread tension meter can be designed inexpensively, simply and compactly, the use of the medium light being extremely advantageous for the precise measurement of forces as low as result from the thread tension of a thin thread.
  • the photo-elastic element as the main active component of the thread tension meter is only scanned contact-free by the light, which simplifies the construction, since no direct electrical tap is required on the photo-elastic element.
  • the thread deflector is expediently supported in the bearing directly by means of the photoelastic element, so that any force resulting from the thread tension is introduced into the photo-elastic element and induces a mechanical stress state in it, which varies strictly depending on the load and can be scanned with light insensitive to interference.
  • a photo-elastic element in plate form is favorable, from which the thread deflector protrudes on one side and thereby has a thread contact area which is spaced from the nearest plate surface by a torsion lever arm.
  • the photoelastic element is primarily subjected to torsion with shear loads, possibly in connection with a bend, since the photoelastic element is particularly sensitive to torsion.
  • the optical axis of the optoelectronic scanning device passes through the plate transversely to the course of the plate, preferably approximately perpendicular to the plate surfaces, so that critical light collimation within an excessively long light path in the photo-elastic element is avoided.
  • the stored mass of the photo-elastic element is only a minimum, so that, especially for use in thread tension measurement, a favorable natural resonance frequency, for example in the order of magnitude of about 1 kHz, with good direct response is achieved.
  • a strip-shaped plate is very practical, which is fixed in the storage at opposite longitudinal ends, the plate width being a multiple of the plate thickness.
  • the optical axis of the optoelectronic scanning device passes through the strip-shaped plate perpendicular to the main plane of the plate and at a distance from the thread deflector and a clamped longitudinal end, i.e. in a range in which the mechanical torsional stress in the photo-elastic element is almost homogeneous, which simplifies the positioning of the optical axis of the optoelectronic scanning device.
  • the photo-elastic element could be a plate clamped on one side, which is contacted at a distance from that in the area of attachment directly from the thread and thus forms the thread deflector itself, or carries a thread guide for contact with the thread.
  • the plate is essentially subjected to bending under the load from the thread tension.
  • Isotropic or quasi-isotropic plastic or isotropic optical glass is particularly suitable as the material for the photo-elastic element.
  • Plastic or optical glass with a reasonably defined, preferably production-related, optical light transmission axis is also suitable for use in the thread tension meter. Such materials are usually isotropic and become anisotropic in a mechanical stress state.
  • a photo-elastic plastic such as polycarbonate, which is commercially available with the desired material specifications, is particularly useful.
  • the induced anisotropy results in different refractive indices for different light polarization directions with respect to the main stresses inside the photoelastic element.
  • the voltage condition can be detected by measuring the intensity of the emerging light, the photoelastic element being placed between two linear polarization elements with crossing polarization axes.
  • the free-running cut edges should be ground on a plate cut out of a plastic film in order to eliminate "frozen" tension , The plate is cut to size and then, at least in the exposed cut edges, brought to the necessary plate width by grinding in order to minimize undesirable influences on the measurement accuracy.
  • the photo-elastic element should have an opaque cover outside the passage area of the optical axis of the optoelectronic scanning device, e.g. a paint job.
  • the light source should emit at least quasi-monochromatic light.
  • a first polarizing element between the light source and the photo-elastic element only linearly polarizes the light that strikes the photo-elastic element.
  • a second polarizing element is placed on the opposite side. is offset by a predetermined angle, for example 90%, above the polarization axis of the first polarizing element.
  • the receiver is positioned behind it.
  • a positioning is determined in which minimal light transmission occurs without loading the photo-elastic element or with a minimal loading, while the light transmission within a wide scanning range applied load and increasing thread tension increases legally up to a maximum.
  • a red light LED is expedient as the light source, while the receiver can be a photo element such as a photo transistor.
  • the output characteristic is not linear, but in a first approximation it is square, i.e. the intensity of the light emerging from the second polarizing element follows an analytical expression that can be easily derived. For example, the intensity of the emerging light is proportional to the squared value of the torque applied by the load, so that the thread tension is determined directly via the constant torsion arm of the load.
  • the thread deflector is expediently a ceramic rod or ceramic tube, preferably with a round cross section, which is fixed to the plate with a holder and extends approximately perpendicular to the plate surface. Ceramic material has good wear resistance against the abrasion of the thread, is light, insensitive to temperature and damping.
  • the plate is fixed upright between two bearing blocks so that it covers the space between the bearing blocks. bridged.
  • a bearing block contains the first and second plate-shaped polarizing elements facing the two plate surfaces, the rotational position of which is expediently adjustable.
  • the light source and the receiver which are also housed in this pedestal, define the optical axis of the optoelectronic scanning device, which penetrates the plate perpendicular to the plate surface, at a distance from the point at which the thread deflector out of the load a torsion in of the plate, and also at a distance from the area of definition of the plate.
  • a bridge-shaped holder with thread guides is also arranged on the base body, which fixes the thread path through the thread tension meter with the thread deflector. If necessary, an additional thread guide is placed in the immediate vicinity of the thread deflector so that the thread acts on the thread deflector at a constant distance from the plate, even if the distances to the thread guides in the thread running direction are chosen to be relatively large. A small deflection angle of the thread is sufficient, which minimizes its mechanical load (friction, diffraction).
  • 1 is a schematic perspective view of a thread tension meter
  • Fig. 2 is a schematic representation of the thread tension meter of Fig. 1, and
  • Fig. 3 schematically shows a modified embodiment of a thread tension meter.
  • a thread tension meter M in FIG. 1 is provided for use on thread processing systems to measure the tension in a running or resting thread F. to measure or to provide an output signal representing the thread tension, possibly for controlling at least one assigned component such as a controllable thread brake (not shown).
  • a typical place of use for the thread tension meter M is the thread path between a thread delivery device and a weaving machine.
  • the thread tension meter M has a base body 1 and a bridge-like holder 2 for two aligned thread guides 3, which define a predetermined, straight thread path through the thread tension meter M.
  • the thread F is deflected at a deflector D, in the embodiment shown on a rod or tube 12, for example made of ceramic material and with a round cross section.
  • the thread F rests on the thread deflector D in a predetermined contact area 14, in which the thread F can be held by a further thread guide, not shown.
  • an optoelectronic scanning device A is arranged, consisting of a light source LS, for example a red light LED 12, a first polarizing element Pj in the form of a square or round plate which can be rotated in the bearing block 5; a second polarizing element Po, located at a distance from one another, likewise in the form of a square or round plate, which can be arranged so as to be rotatably adjustable, and a receiver R, for example a photo element or phototransistor 13 , which provides a signal i.
  • a light source LS for example a red light LED 12
  • a first polarizing element Pj in the form of a square or round plate which can be rotated in the bearing block 5
  • a second polarizing element Po located at a distance from one another, likewise in the form of a square or round plate, which can be arranged so as to be rotatably adjustable
  • a receiver R for example a photo element or phototransistor 13 , which provides a signal
  • a photoelastic element E for example in the form of an elongated, thin plate S, is clamped with a longitudinal end in a fixing area 7 in the bearing block 7 and, for example, as here also with the other longitudinal end in a fixing area 8 in the bearing block 5.
  • the plate S extends upright here between the fixing areas 7 and 8.
  • the plate S has mutually parallel plate surfaces 9 and also mutually parallel plate edge surfaces 10.
  • the thread deflector D is fixed with a holder 11 in a motion-transmitting manner.
  • the plate S consists for example of dielectric, transparent, normally at least quasi-isotropic material such as optical glass or plastic (amorphous organic glass, or plastic with a cubic crystal lattice) and becomes anisotropic in the case of an internal torsional stress condition.
  • the anisotropy results in different refractive indices for different lightwave polarization directions with respect to the main stresses in the interior of the photoelastic element.
  • the photoelastic element E is arranged between two linear polarizing elements Pj, P ⁇ , such that the optical axis of the optoelectronic scanning device A is at a distance from the fixing area 8 and from the holder 11 and approximately is directed perpendicular to the plate surfaces 9 through the plate S, then the voltage condition can be detected by measuring the intensity of the light emerging from the illuminated plate.
  • the polarizing elements are arranged so that their polarization axes cross each other.
  • the light intensity is at least approximately proportional to the squared value of the applied torque, which causes the torsional stress, resulting from the load K and the torsion arm of the thread contact area 14 to the plate S.
  • a polycarbonate for example known with the trade name optical LE-XAN, can be used as the plate with a thickness of, for example, 1 to 2 mm.
  • the polarizing elements Pi, Po are so-called polaroids.
  • the light source LS generates, for example, a quasi-monochromatic light.
  • Sheet polycarbonate is usually not isotropic. Due to the manufacturing process, however, it can have an optical light transmission factor, even if it is not under mechanical tension.
  • the two polarizing elements can be used to find two orthogonal positions with which the light extinction between the polarizing elements is almost perfect, for example better than 0.1%. Since the photoelastic element can only be twisted, it works with low sensitivity to vibrations.
  • the behavior under pure torsional stress is explained with reference to FIG. 2.
  • the plate S for example made of polycarbonate, has a width h, a length I and a thickness b. It is defined at the left end in definition area 7.
  • a torque T is applied to the other end.
  • a uniform stress status appears in the plate S as a stress tensor. This modifies the dielectric tensor so that the plate S has an anisotropic behavior.
  • the main voltages lie on the XY plane, so that their direction is never parallel to the axes of the two polarizing elements Pj, P 0 , the axes of which are mainly oriented in the X direction.
  • Each light wave front perpendicular to the plate S is divided into two waves which propagate in the plate S at two different speeds, as a result of the different refractive indices along two main axes. This results in a phase difference, with the chosen arrangement resulting in a constant phase delay over almost the entire plate extension, at least as far as the isochromates of light are concerned.
  • the light emerging from the second polarizing element P 0 follows an analytical equation that can be easily derived.
  • the polycarbonate plate has, for example, a length of 50 mm, a width of 20 mm and a thickness of 2 mm and can be reliably scanned with the optoelectronic scanning device A to derive a meaningful output signal, in particular by applying a torsional tension to measure the thread tension to be able to.
  • the photoelastic element E is again a plate S with mutually parallel plate surfaces 9 and plate edge surfaces 10.
  • the plate is cut out of a polycarbonate film parallel to its main direction, this main direction should coincide with de main dimension of the film.
  • the plate is cut out with a larger width than required.
  • the correct dimension is produced by grinding at least the longitudinal cut edges in order to eliminate frozen or internal stress states from the production and / or the cutting of the plate.
  • the surfaces of the plate that are not used are expediently provided with opaque shielding, e.g. with a paint application C in Fig. 1st
  • the plate S is clamped on one side only in the bearing block 4 in the fixing area 7. It cantilevers with the other end.
  • the sheet S can serve directly as the thread-deflector D by the thread F is diverted directly from the ⁇ plate and in the contact region 14 to the load K dispense.
  • the optoelectronic scanning device A is arranged between the fixing region 7 and the contact region 14 in such a way that its optical axis passes through the plate approximately perpendicular to the plate surfaces 9 and at a distance from the longitudinal edges.
  • a thread guide 15 is fixed at the free end of the plate S directly or with a holder 16, which forms the contact area 14 for the thread F.
  • the plate is mainly subjected to bending, so that with the optoelectronic scanning device A, the inner bending Tensions are detected and the thread tension is deduced from the bending tension conditions by varying the intensity of the emerging light.
  • the scanning principle can also be described with the birefringence phenomenon.
  • the evaluation circuit is relatively simple. It also serves to activate the light source LS and to polarize the photo element, for example a phototransistor 13.
  • the output signal is read off, for example, via an approximately 10 K-ohm load resistor, in connection with a 10 nF parallel filter capacitor, and can be connected directly to an oscilloscope managed, without further reinforcement or conditioning.
  • the visual representation is carried out using 16 average patterns, for example.
  • the connecting lines to the evaluation circuit, and then further, should expediently be well shielded in order to superimpose as little noise as possible on the thread tension signal.
  • the thread tension meter Due to the pure torsional tension in the photo-elastic element, the thread tension meter is relatively insensitive to vibrations which are oriented differently, as is usually the case in thread processing systems, e.g. on a weaving machine are inevitable.
  • the thread tension meter M is compact, structurally simple and consists of a few and inexpensive parts. It is reliable and can be used universally.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

L'invention concerne un dispositif (M) destiné à mesurer la tension d'un fil dévié sur un déflecteur fixe (D). Un circuit d'exploitation (6) produit des signaux de sortie (i) à partir de la charge (K) correspondant à la tension du fil (t), et au moins un système transducteur (E) est disposé dans le trajet de transmission de charge. Selon l'invention, ledit système transducteur (E) comporte un élément photoélastique transparent (S) logé de manière à pouvoir être déformé élastiquement, ainsi qu'un système de balayage optoélectronique (A) raccordé au circuit d'exploitation (6), destiné à relever au moins une caractéristique optique de l'élément photoélastique (S) variant en fonction de la charge.
PCT/EP2002/003691 2001-04-10 2002-04-03 Dispositif destine a mesurer la tension d'un fil sur la base d'un principe de mesure photoelastique Ceased WO2002088013A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001117878 DE10117878A1 (de) 2001-04-10 2001-04-10 Fadenspannungsmesser
DE10117878.6 2001-04-10

Publications (1)

Publication Number Publication Date
WO2002088013A1 true WO2002088013A1 (fr) 2002-11-07

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PCT/EP2002/003691 Ceased WO2002088013A1 (fr) 2001-04-10 2002-04-03 Dispositif destine a mesurer la tension d'un fil sur la base d'un principe de mesure photoelastique

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DE (1) DE10117878A1 (fr)
WO (1) WO2002088013A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2660671C2 (ru) * 2013-10-08 2018-07-09 Бтср Интернэшнл С.П.А. Компактное устройство для управления подачей нити к обрабатывающей машине

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10249278A1 (de) * 2002-10-23 2004-06-09 Memminger-Iro Gmbh Fadenspannungssensor
CN102359840B (zh) * 2011-06-24 2013-02-13 浙江理工大学 一种梭口中纬纱张力的测量方法
DE102013013706A1 (de) 2013-08-20 2015-02-26 Otto-Von Guericke-Universität Magdeburg Technologie-Transfer-Zentrum Sensorvorrichtung und Verfahren zur drahtlosen Messung von Spannungen und Rissenstehungsprozessen
CN115459276B (zh) * 2022-11-11 2023-04-21 中国南方电网有限责任公司超高压输电公司广州局 柔直换流站交流系统谐振抑制方法、装置和计算机设备

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2535209A1 (de) * 1975-08-07 1977-06-23 Dienes Honeywell Gmbh Fadenkraftmessgeraet
JPS60173431A (ja) * 1984-02-20 1985-09-06 Hitachi Constr Mach Co Ltd 荷重検出装置
EP0288784A2 (fr) * 1987-04-18 1988-11-02 Barmag Ag Dispositif de mesure de la tension d'un fil, dont le palpeur est monté à l'aide de ressorts
US5475489A (en) * 1991-06-07 1995-12-12 Goettsche; Allan Determination of induced change of polarization state of light
DE29622575U1 (de) * 1996-12-31 1998-04-30 Philipp, Jens, 80336 München Kraftsensor
EP0852217A2 (fr) * 1997-01-03 1998-07-08 New House Textiles Limited Dispositif de contrÔle de la tension
DE19837414A1 (de) * 1997-08-25 1999-03-04 Barmag Barmer Maschf Fadenspannungsmeßeinrichtung

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2535209A1 (de) * 1975-08-07 1977-06-23 Dienes Honeywell Gmbh Fadenkraftmessgeraet
JPS60173431A (ja) * 1984-02-20 1985-09-06 Hitachi Constr Mach Co Ltd 荷重検出装置
EP0288784A2 (fr) * 1987-04-18 1988-11-02 Barmag Ag Dispositif de mesure de la tension d'un fil, dont le palpeur est monté à l'aide de ressorts
US5475489A (en) * 1991-06-07 1995-12-12 Goettsche; Allan Determination of induced change of polarization state of light
DE29622575U1 (de) * 1996-12-31 1998-04-30 Philipp, Jens, 80336 München Kraftsensor
EP0852217A2 (fr) * 1997-01-03 1998-07-08 New House Textiles Limited Dispositif de contrÔle de la tension
DE19837414A1 (de) * 1997-08-25 1999-03-04 Barmag Barmer Maschf Fadenspannungsmeßeinrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 019 (P - 423) 24 January 1986 (1986-01-24) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2660671C2 (ru) * 2013-10-08 2018-07-09 Бтср Интернэшнл С.П.А. Компактное устройство для управления подачей нити к обрабатывающей машине

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