WO1982003915A1 - Procede et dispositif pour la mesure de la tension d'un fil se deplacant - Google Patents

Procede et dispositif pour la mesure de la tension d'un fil se deplacant Download PDF

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Publication number
WO1982003915A1
WO1982003915A1 PCT/CH1982/000054 CH8200054W WO8203915A1 WO 1982003915 A1 WO1982003915 A1 WO 1982003915A1 CH 8200054 W CH8200054 W CH 8200054W WO 8203915 A1 WO8203915 A1 WO 8203915A1
Authority
WO
WIPO (PCT)
Prior art keywords
thread
tension
detector
frequency
loudspeaker
Prior art date
Application number
PCT/CH1982/000054
Other languages
German (de)
English (en)
Inventor
Sa Viscosuisse
Original Assignee
Zumstein Andre
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 Zumstein Andre filed Critical Zumstein Andre
Priority to BR8207717A priority Critical patent/BR8207717A/pt
Publication of WO1982003915A1 publication Critical patent/WO1982003915A1/fr

Links

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
    • G01L5/042—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 by measuring vibrational characteristics of the flexible member
    • 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
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H13/00—Measuring resonant frequency
    • 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 method for measuring the tension of a running thread, in that the thread is guided over two pins arranged at a distance from one another and is caused to oscillate between the pins by pressure changes with a loudspeaker.
  • the invention further relates to an apparatus for performing this method.
  • Threads is obvious. The thread run is disturbed by the measurement. There are cases where thread breaks occur during the measuring process, or the effective thread tension conditions are falsified by the introduction of the sensor itself.
  • a thread When a thread is deflected on a thread guide pin with a diameter of 5 mm at a speed of 3500 m / min, the thread has an acceleration that corresponds to 140,000 times the acceleration due to gravity. The thread will not be able to follow the deflection provided, as a result of which the measurement results will be falsified.
  • a roll of 12 mm in diameter would have a speed of approx. 100,000 t / min on the same thread, which would greatly reduce the service life of the ball bearings. However, the friction in the bearings would not be constant, and it would also result a measurement error arises.
  • a thread can be considered a string.
  • a string vibrates at a frequency which is determined by the free length of the string, the mass and its tension '. This defined frequency is also referred to as resonance or natural frequency. If a tensioned string is excited to oscillate with a force field with a variable frequency, then it can oscillate purely with a larger amplitude if the frequency which is obtained is the frequency of the egg or an integer multiple thereof (1st, 2nd or higher order harmonics).
  • a running thread between two thread guide elements behaves similarly.
  • the vibration can be stimulated, for example, with a loudspeaker, the membrane of which is covered up to a narrow slot.
  • the thread then runs over or in the slot.
  • the resonance frequency of the thread can be sought by varying the frequency of the loudspeaker with the aid of the tone generator (FIG. 2). When this frequency is found, the tension of the thread can then be calculated.
  • the disadvantage of this method is that firstly you have to work manually by re-adjusting the natural frequency of the thread for each variation of the voltage and secondly that errors can occur because the eye cannot always determine the resonant frequency exactly.
  • the invention relates to a method for measuring the tension of a running thread, in that the thread is guided over two pins arranged at a distance from one another and caused by pressure changes with a loudspeaker, between the
  • f is the oscillation frequency of the thread in Hz
  • n is the atomic number of the oscillation (1, 2, 3,)
  • P is the specific mass of the thread in kg
  • A is the cross section of the thread m m and x is the free swinging length in m.
  • the thread detector consists of a light source and a light emitter such as a reflection scanner or a light barrier, ' .- * " -.
  • the speaker vibrates the running thread, but the use of a high voltage electrode is also possible.
  • the detector emits a light beam, which we reflect when it hits the running thread. This reflects light then induces an electrical signal in the receiver which, after amplification, sets the diaphragm of the loudspeaker in motion. This movement excites the vibration of the running thread through the air.
  • the thread can be made to vibrate and kept vibrating.
  • the ordinal number ri can theoretically only be an odd number when a thread is excited with a loudspeaker, which is arranged approximately in the middle of the free length x. In practice the value 3 will be difficult to achieve due to the loose coupling of loudspeaker and thread. This atomic number ri can therefore be assumed to be 1.
  • f is the vibration frequency in Hz
  • x is the length in m T the thread titer in dtex
  • F means the thread tension in cN.
  • the frequency can be measured digitally with a counter and the thread tension can be calculated according to this formula (2).
  • the thread titer T is to be used as an effective titer, ie including any preparation application and taking into account any reduction in the titer due to elastic stretching due to the thread tension. Titvariations are also measured.
  • the last formula shows that the frequency is dependent on the specific thread tension, which limits the frequency range for coarse and fine titers, an advantage that simplifies the devices for analog evaluation.
  • the measuring method according to the invention can be automated.
  • the invention further relates to a device for carrying out the above-mentioned method, characterized in that it contains a body provided with a longitudinal slot for the passage of the running thread, which has a loudspeaker and a detector on the side of the longitudinal slot, which by a Amplifiers are connected.
  • the body is located approximately in the middle of the free length of the thread.
  • the thread detector is a reflection scanner or a light barrier.
  • the reflection scanner and the light barrier contain a light source in the UV, IR or visible range, for example an IR diode and a light receiver, for example a phototransistor.
  • the reflection scanner is attached perpendicular to a vibration plane of the thread.
  • the inventive device further contains a digital frequency meter, which may directly measure the frequency '.
  • the device can contain a frequency converter, a filter and an amplifier, a multiplier and a means for indicating the voltage.
  • the function of these elements is as follows:
  • the frequency voltage converter converts the frequency into an analog voltage.
  • This tension is then filtered and amplified and must be squared in accordance with formula (2) in the multiplier, so that this magnitude corresponds linearly to the thread tension. If a corresponding calibration has been made beforehand, the thread tension can be read off directly on the means for specifying the tension. This means is usually a voltmeter.
  • the device according to the invention offers the possibility either to read the frequency digitally and to calculate the thread tension according to formula (2) manually or to read the thread tension directly without calculation.
  • the accuracy of the digital frequency measurement is very high, changes in the amplifier, reflection scanner, light barrier or loudspeaker do not interfere.
  • the accuracy in the analog measurement processing is more favorable than in previous measurement methods, since no changes occur in the encoder, but only small drifts in the amplifiers belonging to the frequency evaluation can disturb.
  • Fig. 3 is a view of the device according to the invention in a first embodiment.
  • FIG. 4 is a view in the direction y of FIG. 3rd
  • Fig. 5 is a schematic representation of the device according to the invention in a second embodiment.
  • the two devices of FIGS. 1 and 2 have already been mentioned in the introduction to the description.
  • the thread 1 is deflected on two fixed pins B, C and on a movable pin A.
  • the force F i.e. the thread tension is measured at pin A.
  • a thread 2 is made to vibrate by a loudspeaker 3 by looking for the inherent frequency of the thread with a tone generator 4.
  • the free length x of the vibration is determined by the two pins 5, 6.
  • a digital frequency meter 20 allows the frequency of the thread to be read directly, so that the thread tension can be calculated according to formula (2).
  • the device additionally contains a frequency tension converter 21, which converts the frequency into an ' analog voltage, a filter and amplifier 22, a multiplier 23, which squares the amplified tension, see above that this size corresponds to the thread tension.
  • the thread tension can then be read off directly from a voltmeter 24.
  • the device according to the invention is totally automated and allows the thread tension to be determined without deflecting the thread from its straight path.
  • This device is suitable for all measurements of thread tensions, both fine and coarse titers, and can be placed on any textile machine for which such a measurement is of interest.

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

Abstract

Le dispositif de mesure de la tension d'un fil se deplacant presente une fente allongee (9) dans laquelle se deplace le fil (13), un haut-parleur (8) et un detecteur (10) sont disposes sur les cotes de la fente et connectes a un amplificateur (12).
PCT/CH1982/000054 1981-04-29 1982-04-16 Procede et dispositif pour la mesure de la tension d'un fil se deplacant WO1982003915A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BR8207717A BR8207717A (pt) 1981-04-29 1982-04-16 Processo e dispositivo para medir a tensao de um fio em movimento

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH277781 1981-04-29
CH2777/81810429 1981-04-29

Publications (1)

Publication Number Publication Date
WO1982003915A1 true WO1982003915A1 (fr) 1982-11-11

Family

ID=4241366

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1982/000054 WO1982003915A1 (fr) 1981-04-29 1982-04-16 Procede et dispositif pour la mesure de la tension d'un fil se deplacant

Country Status (6)

Country Link
JP (1) JPS58500580A (fr)
BR (1) BR8207717A (fr)
DE (1) DE3242674D2 (fr)
FR (1) FR2504898A1 (fr)
GB (1) GB2109556A (fr)
WO (1) WO1982003915A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0100394A1 (fr) * 1982-07-13 1984-02-15 Zellweger Uster Ag Méthode et dispositif pour mesurer la tension de textiles plats sur des machines textiles, spécialement des métiers automatiques
FR2671403A1 (fr) * 1991-01-07 1992-07-10 Renault Automation Procede de mesure en continu de la tension d'une courroie, et dispositif de mesure permettant la mise en óoeuvre du procede.

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2533314B1 (fr) * 1982-09-22 1985-06-14 Rhone Poulenc Fibres Procede et dispositif pour la mesure sans contact de la tension de produits filiformes et de surfaces en mouvement
FR2545107B1 (fr) * 1983-04-29 1985-06-28 Rhone Poulenc Fibres Procede pour ameliorer la regularite de structure des filaments a base de polymeres thermoplastiques
NO854553L (no) * 1985-11-14 1987-05-15 Papirind Forskningsinst Banespenningsmaaler.
US4692615A (en) * 1985-12-09 1987-09-08 Corning Glass Works Apparatus and method for monitoring tension in a moving fiber by Fourier transform analysis
GB8606074D0 (en) * 1986-03-12 1986-04-16 Fawcett John N Monitoring belt tension
FI89537C (fi) * 1992-01-09 1993-10-11 Soundek Oy Maetanordning foer maetning av dragspaenningen av en optisk fiber eller motsvarande traod
AU3556795A (en) * 1994-07-11 1996-02-09 Hes Optical Fibres (Uk) Limited Method and apparatus for measuring tension in a moving strand
JPH08292111A (ja) * 1995-04-24 1996-11-05 Mitsubishi Electric Corp ベルト張力測定装置
FR2761774A1 (fr) * 1997-04-07 1998-10-09 Yves Michnik Systeme de controle de tension sans contact par observation de la vibration

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1120897A (fr) * 1954-03-16 1956-07-16 Siemens Ag Procédé et dispositif pour la détermination des tensions mécaniques des fils des grilles tendus pour récipients de décharge électriques ou appareils analogues
US3394587A (en) * 1966-03-09 1968-07-30 Du Pont Web tension indicator
US3850031A (en) * 1973-05-23 1974-11-26 Voest Alpine Montan Ag Process and apparatus for determining the variation of tensile stresses in cold-rolled strip over the width thereof
US3854329A (en) * 1971-11-23 1974-12-17 Masson Scott Thrissell Eng Ltd Apparatus for web tension measurement
US3871217A (en) * 1973-04-25 1975-03-18 Rucker Co Continuous cable tension monitor
US4235102A (en) * 1978-03-10 1980-11-25 Svenska Traforskningsinstitutet Method and apparatus for measuring the ratio between web tension and substance

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT359320B (de) * 1978-07-11 1980-11-10 Chemiefaser Lenzing Ag Verfahren und einrichtung zur bestimmung des titers von natuerlichen oder synthetischen faeden oder fasern
FR2466747A1 (fr) * 1979-10-01 1981-04-10 Inst Textile De France Procede et installation de controle du diametre d'un fil ou cable

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1120897A (fr) * 1954-03-16 1956-07-16 Siemens Ag Procédé et dispositif pour la détermination des tensions mécaniques des fils des grilles tendus pour récipients de décharge électriques ou appareils analogues
US3394587A (en) * 1966-03-09 1968-07-30 Du Pont Web tension indicator
US3854329A (en) * 1971-11-23 1974-12-17 Masson Scott Thrissell Eng Ltd Apparatus for web tension measurement
US3871217A (en) * 1973-04-25 1975-03-18 Rucker Co Continuous cable tension monitor
US3850031A (en) * 1973-05-23 1974-11-26 Voest Alpine Montan Ag Process and apparatus for determining the variation of tensile stresses in cold-rolled strip over the width thereof
US4235102A (en) * 1978-03-10 1980-11-25 Svenska Traforskningsinstitutet Method and apparatus for measuring the ratio between web tension and substance

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0100394A1 (fr) * 1982-07-13 1984-02-15 Zellweger Uster Ag Méthode et dispositif pour mesurer la tension de textiles plats sur des machines textiles, spécialement des métiers automatiques
FR2671403A1 (fr) * 1991-01-07 1992-07-10 Renault Automation Procede de mesure en continu de la tension d'une courroie, et dispositif de mesure permettant la mise en óoeuvre du procede.

Also Published As

Publication number Publication date
DE3242674D2 (en) 1983-09-08
JPS58500580A (ja) 1983-04-14
GB2109556A (en) 1983-06-02
FR2504898A1 (fr) 1982-11-05
BR8207717A (pt) 1983-05-10

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