EP0436204A1 - Procédé pour l'obtention d'un signal représentant un fil en mouvement - Google Patents

Procédé pour l'obtention d'un signal représentant un fil en mouvement Download PDF

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Publication number
EP0436204A1
EP0436204A1 EP90125114A EP90125114A EP0436204A1 EP 0436204 A1 EP0436204 A1 EP 0436204A1 EP 90125114 A EP90125114 A EP 90125114A EP 90125114 A EP90125114 A EP 90125114A EP 0436204 A1 EP0436204 A1 EP 0436204A1
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EP
European Patent Office
Prior art keywords
thread
sensor
signal
frequency
filter
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.)
Granted
Application number
EP90125114A
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German (de)
English (en)
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EP0436204B1 (fr
Inventor
Peter Anderegg
Peter Oehy
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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Priority to EP94102738A priority Critical patent/EP0608001B1/fr
Publication of EP0436204A1 publication Critical patent/EP0436204A1/fr
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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
    • B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
    • B65H63/028—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element
    • B65H63/032—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic
    • B65H63/0321—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators
    • B65H63/0327—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators using piezoelectric sensing means
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
    • D01H13/16—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material
    • D01H13/1616—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material characterised by the detector
    • D01H13/1633—Electronic actuators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/10—Speed
    • B65H2513/11—Speed angular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/30—Forces; Stresses
    • B65H2515/31—Tensile forces
    • 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
    • B65H2553/20—Sensing or detecting means using electric elements
    • B65H2553/26—Piezoelectric sensors
    • 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 present invention relates to a method for obtaining a thread running signal, in which at least one sensor is attached to the suspension of a thread guide and supplies a signal which, among other things, reflects the vibrations induced in the thread guide by the thread movement.
  • a thread break at a spinning station results in loss of production and subcontracted work and in certain cases can also damage the machine.
  • the main causes of thread breaks are, for example, thin spots in the yarn, poorly maintained parts in the yarn formation process or incorrect setting of the spinning machine.
  • Known thread monitoring devices record parameters such as the ballooning of the thread or the speed of the rotor in a ring spinning machine, the changes over time in the thread thickness of the running thread or the cross-section of the thread.
  • the aforementioned DE-OS 29 19 836 discloses a yarn break sensor which consists of a piezoelectric element which is attached to a part of the yarn guide and whose output signal is further processed to detect a yarn break.
  • the frequency of the mechanical vibrations is about 1 kHz, while the thread guide vibrates at about 15 kHz.
  • These latter vibrations are evaluated in DE-OS 29 19 836 to determine thread breaks in such a way that the natural vibrations are discriminated against the mechanical vibrations.
  • the two connecting lines of the piezoelectric element are connected to a bandpass filter, which receives, ie transmits, the natural vibration component in the output signals of the piezoelectric element. This natural vibration component is then amplified to a certain value by means of an amplifier.
  • a rectifier filter converts the AC signals into DC signals.
  • a voltage range is defined in which normal operation is guaranteed, and a corresponding logic output signal is present at the output of the comparator (DE-OS 29 19 836, p. 10, lines 29 to 11, line 6 ).
  • the thread sensor from DE-OS 29 19 836 is only able to determine thread breaks, but not to measure the thread tension.
  • the invention has for its object to provide an inexpensive thread tension measuring device, which can possibly also serve as a thread break detector, is inexpensive to manufacture and can be attached to existing thread processing or generating machines without the attachment itself to a change in the thread tension or leads to an undesirable additional stress on the thread.
  • the present invention is characterized in terms of method in that that a broadband sensor in the form of a piezo film is used, which is arranged at least essentially in a plane containing the thread running direction or a plane parallel to it in such a way that the suspension of the thread guide executes elastic movements on both sides (in relation to the thread running direction) that to obtain a signal corresponding to the thread tension, either the frequency of an element winding the thread and / or harmonic of this frequency is filtered out from the sensor signal and the level of this filtered frequency or frequencies is measured, the frequency or frequencies filtered out by a filter being well above that Basic oscillation frequency of the thread guide, ie the natural oscillation frequency of the thread guide eye lies or lie, and that the pass frequency of the filter is tracked in accordance with the frequency change of the element winding the thread, the quality of the filter preferably e is kept at least substantially constant.
  • the invention is based on the knowledge belonging to the invention that the output signal of the sensor is a complex analog signal which also contains, among other things, the speed of the rotor as a fundamental vibration in the course of the deflection of the thread guide as well as harmonic values of this fundamental vibration and the so-called thread noise. in addition to other vibrations such as the natural vibrations of the thread guides and vibrations induced by machine vibrations. Furthermore, the invention is based on the inventive finding that both the level of the rotor speed and the level of harmonic frequencies of the rotor speed are a function of the thread tension, so that an evaluation of the thread tension either at the fundamental frequency (f 1) or at the harmonic frequencies (f 2 to f9) the rotor speed is possible.
  • the evaluation of the sensor signal can therefore be based on the fact that the level of the thread tension is detected as a value or that a level comparison is carried out with a reference level.
  • This reference level can depend on machine parameters such as spindle speed, maintenance status, etc.
  • the result of this comparison can then be used to control the corresponding machine, for example to control the spindle speed of a ring spinning machine in the sense of maintaining a predetermined thread tension or a predetermined course of the thread tension using the bobbin forming method.
  • the thread guide is preferably designed as a thread guide eyelet, for example in the form of the well-known Sauschwanzerls.
  • the thread guide eyelet can be fastened to its holder by means of a leaf spring, the sensor being fastened to the leaf spring.
  • the level of the leaf spring itself should be arranged essentially parallel to the thread movement.
  • the piezo sensors used in the prior art are piezo crystals which have a pronounced resonance and are therefore not sufficiently broadband for the purpose of the invention.
  • a special embodiment of the present invention is characterized in that the piezo film is a so-called PVDF film, which is particularly inexpensive to obtain and is extremely thin.
  • These piezo foils are very broadband and the use of such a piezo film advantageously does not falsify the measured vibrations.
  • non-thread-guiding reference sensor for one or more thread tension sensors which emits a signal which is dependent on the machine vibrations, wherein the thread tension signals can be compared with the reference signal and a difference value can be formed .
  • the reference signal can also be used as a threshold value for the generation of binary thread break information.
  • FIG. 2 shows a side view of a spinning station 10 of a ring spinning machine, in which a thread 12 leaves the outlet rollers 14, 16 of the drafting system and leads through the thread guide eyelet 18 and an anti-balloon ring 20 to a ring traveler 22 rotating on the ring track 21 of the ring rail 23, whereby it is wound on the rotating spindle sleeve 24 to a cop 26.
  • the thread Due to the rotation of the rotor, the thread is guided around the spindle sleeve in such a way that a balloon is formed due to the centrifugal force, which is limited by the anti-balloon or balloon limiting ring 20 and has its tip in the thread guide eyelet.
  • the friction and air resistance of the runner, the air resistance of the thread and the frictional resistance between the thread and the runner and between the thread and the balloon confinement ring produce a thread tension which can be measured at the location of the thread guide.
  • This thread tension increases with increasing spindle speed.
  • a spindle speed range between about 6000 rpm and 20,000 rpm, whereby the thread tension sensor, as described here, easily for spindle speeds or rotor revolutions (which are only 1 or 2% lower than the spindle speeds and can therefore be equated with them ) up to 30,000 rpm and higher are suitable.
  • the horizontal components of this frictional force are used, which are proportional to the thread tension due to the friction coefficient.
  • This thread sensor is shown schematically in FIGS. 1a and 1b.
  • the thread guide eyelet 18 is so tapered in the rear part that a bendable, resilient zone 30 with the shape of a Leaf spring is created.
  • the leaf spring-like part 30 is clamped at its end facing away from the thread guide eyelet in a clamping block 35 and is held by means of this clamping block firmly on the frame of the ring spinning machine on a longitudinal rod 37 of the ring spinning machine.
  • a strain-sensitive sensor element 32 is attached, which preferably consists of a PVDF piezo film.
  • This film emits an extension-dependent electrical signal to a downstream electronics (FIG. 5) via the connecting cable 36.
  • the thread 12 runs essentially in a straight line from the pair of delivery rollers 14, 16 to the thread guide 18 and is deflected on the thread guide due to the balloon that is being formed.
  • the rotational movement of the carriage 22 causes the thread to make a circular movement within the thread guide, whereby the forces exerted on the thread guide alternately act on the left and right sides thereof.
  • the leaf spring 30 is also sometimes bent to the left and sometimes to the right (L and R in Fig. 1b), so that the piezo film also performs an alternating movement and generates an alternating voltage. This alternating movement is important for the functioning of the sensor.
  • the piezo film is arranged in a plane which contains the thread running direction in front of the thread guide
  • the piezo film or the leaf spring could also, for example, be arranged laterally offset from the thread guide. This arrangement would also lead to the lateral deflection of the leaf spring on both sides.
  • FIGS. 7A, 7B and 7C It is also possible to form the thread guide eyelet in one piece from shaped sheet metal, as shown in FIGS. 7A, 7B and 7C.
  • the guide eye formed of spring steel is shaped so that it in the leaf spring part 32 originally at least essentially maintains a straight or rectangular cross section (FIG. 7C) of the sheet metal strip.
  • this cross-section changes to an arcuate cross-section (FIG. 7B) so that the narrowest passage of the eyelet is formed by the curved central region 18 'of the strip, while the edge regions are further away from the center of the eyelet are.
  • the thread is always guided by the curved region 18 'of the strip, and there is no scraping of the thread at the edges of the strip.
  • the sheet metal strip can be wider in the leaf spring part than indicated in the eyelet part at 34 '.
  • FIG. 3a first shows the time course 38 of the lateral deflection of the thread guide eyelet when the thread tension is high, specifically for an embodiment corresponding to FIGS. 1a and 1b. It can be seen that the curve 38 according to FIG. 3a essentially represents a type of sine wave 40 with a superimposed high-frequency oscillation 42 of a complex type. The sine oscillation corresponds to the rotational speed of the ring traveler 22 and the superimposed oscillations contain information about all other vibrations to which the thread guide eye is exposed .
  • FIG. 3b If one carries out a spectral analysis of the sensor signal according to FIG. 3a, a result is obtained, as shown in FIG. 3b.
  • the basic vibration are harmonic vibrations f2, f3, f4 to f9 and the so-called thread noise, which ranges from f10 to f11.
  • the thread noise is caused on the one hand by the fibrous surface of the thread, and on the other hand by the constantly fluctuating cross-section of the thread (thinning or thickening).
  • Both the level of the speed f1 and the level of their harmonics f2 to f9 are a function of the thread tension. This makes a comparison between FIGS. 3a and 3b on the one hand and FIGS. 4a and 4b on the other hand clear.
  • the evaluation can be based on the fact that the level of the thread tension is recorded as a value, or that only a level comparison with a reference level is carried out.
  • This reference level can depend on machine parameters such as spindle speed, maintenance status, etc.
  • the comparison with a reference level reduces the thread tension information to a pure thread run or thread break information, which significantly reduces the data transmission and data evaluation effort. It is thus possible to design a ring spinning machine in such a way that only one thread break signal is generated at all spinning positions, but that the thread tension is also measured at some spinning positions.
  • the actual sensor is the same for all spinning positions, only there is a difference in the evaluation of the sensor signal.
  • the very broadband sensitivity of a thread tension sensor according to the invention which, according to current determinations, ranges from less than 1 Hz to over 1 MHz, means that not only does the thread tension of the sensor signal come in, but also machine vibrations, most of which come from the area of the spindle or Rotor speed, but also of high-frequency components from the area of thread noise come. If a thread runs through the thread guide eyelet, these machine vibrations do not interfere because they are too weak. In the event of thread breakage, however, these vibration signals appear and simulate a very weak thread tension signal.
  • a reference sensor is attached to the machine, which works under exactly the same conditions as the thread tension sensor, i.e. it is also attached to a thread guide, but to one that does not carry a thread.
  • the signal from this reference sensor is processed in a similar manner to the signals from the thread-guiding sensors.
  • the upper reference level is now obtained from the signal from the reference sensor.
  • the reference sensor provides the reference level for one or more thread break sensors. This takes into account local conditions that determine the interference level.
  • a reference sensor is preferably used for groups with 20 to 60 active sensors.
  • FIGS. 5a to 5c Possible designs of the signal evaluation electronics are shown in FIGS. 5a to 5c.
  • the signal of the sensor applied to the terminal 52 is amplified with one or more amplifiers 54, freed of unwanted signal components with filter 56 and then fed to a rectifier / integrator 58.
  • the filter 56 can be a so-called moving filter, which includes control of a center frequency in accordance with the respective rotor speed. This center frequency can also be asymmetrical in the frequency pass range of the filter. A particularly preferred filter of this type will be described later in connection with FIG. 8.
  • the output signal of the rectifier / integrator 58 which is present at the terminal 60, is then fed to the circuit according to FIG. 5b as an input signal.
  • the circuit according to FIG. 5a is identified overall by the reference number 62.
  • the signal present at terminal 60 is converted into a digital signal by means of an analog / digital converter 64, which is analyzed by a subsequent microcontroller 66 in order to obtain the thread tension.
  • Terminal 70 makes it possible to apply a reference voltage to the analog / digital converter, this reference voltage being obtained from the above-mentioned reference sensor and, for the purpose of comparison with the signal present at terminal 60, also being prepared by a circuit corresponding to circuit 62.
  • the thread tension signal generated by the microcontroller is present at terminal 68 and can be represented in various ways, e.g. the thread tension signal can be displayed on a screen as part of a screen display. However, it can also be fed to the machine control and taken into account here, for example when controlling the rotational speed of the spindle drive.
  • 5c shows an alternative embodiment of the evaluation of the signal present at terminal 60 by a comparator 72, which compares it in analog form with a reference voltage U Ref , which is present at terminal 74 and, as mentioned above, from the reference sensor via a Circuit corresponding to the circuit 62 is obtained.
  • the output signal of the comparator 72 is then further processed by a microcontroller 76 into a thread tension signal which can be tapped at the terminal 78.
  • the thread tension signal can be displayed or evaluated in accordance with the thread tension signal present at terminal 68. 5c, the analog / digital conversion takes place in the microcontroller 76.
  • a predetermined reference voltage U Ref can be used, which is either constant or whose level can be varied depending on machine operating states.
  • The. Fig. 6 shows an alternative evaluation which can be used in particular when a reference sensor 80, as explained above, is attached to the machine, i.e. when a reference sensor 80 is attached to a thread guide that does not carry a thread.
  • FIG. 6 initially shows a series of input terminals 52, 52.1, 52.2 to 52.n, which each carry the signal from a thread-guiding sensor 32.
  • Each terminal 52 to 52.n leads to a respective circuit 62 according to FIG. 5a and the output terminals 60, 60.1 to 60.n of these circuits 62 are applied to an electronic switch 81 which is able to switch the signals successively or in one to be forwarded to a further circuit 82 in a specific sequence or in a selected sequence, wherein this further circuit 82 can be designed either in accordance with FIG. 5b or in accordance with FIG. 5c.
  • the terminal 52.r carries the voltage from the reference sensor 80, which is likewise amplified, filtered and integrated by means of a circuit 62 in accordance with FIG. 5a.
  • the output signal of the circuit 62 associated with the reference sensor 80 forms the reference voltage for the further processing circuit according to FIG. 5b or FIG. 5c.
  • the level of the reference sensor 80 is compared with the level of the thread guiding sensors 32, 32.1, 32.2 to 32.n. The difference is then further processed as a pure thread tension signal, for example in accordance with FIG. 5b or 5c.
  • the changeover switch 62 is generally not designed as a mechanical switch, but as an electronic circuit, for example using a multiplex method.
  • An arrangement according to FIG. 6 has the advantage that only a complex evaluation circuit is required in order to further process the signals from a large number of yarn break sensors to yarn tension signals.
  • a piezo film sensor is provided for each thread guide, so that a thread break signal can be generated by each of the spinning positions present in total.
  • the cabling is carried out so that there is a possibility at certain spinning positions, for example every twentieth or every fiftieth spinning position, to measure the respective thread tension.
  • One or two thread guides are then provided on the machine on each side, which do not carry a thread, but which are designed like the other thread guides and are also equipped with piezo film sensors in order to generate the above-mentioned reference signals.
  • FIG. 8 is a block diagram which shows the use of a filter in SC design (SC means "switched capacitor”), which is preferably in the form of a chip, namely the MF 10 chip from National Semiconductors.
  • SC means "switched capacitor”
  • a tachometer generator 104 is mounted on the main shaft of the drive motor. This essentially consists of a gearwheel 106 and an initiator or sensor 108 which counts the gaps 110 present in the gearwheel and generates a signal which is dependent on the speed of the main motor and is indicated in the drawing as an "f-sensor". The exact frequency of this signal depends on the number of teeth on the gear and the speed of rotation of the main motor.
  • multiplier 112 After a translation between the main motor and the spindles of the ring spinning machines, due to the interposed drives, it is necessary to multiply the frequency signal by a factor in order to achieve the actual spindle speed. But even then the frequency of the signal must be increased further, since a clock frequency is required to control the filter 56, which is proportional to the spindle speed or rotor speed, but is approximately 100 times higher in frequency. With a spindle speed of 12000 rpm, which corresponds to 200 Hz, a clock frequency of 20 kHz is required, for example.
  • the circuit indicated in the drawing as multiplier 112 therefore receives the frequency signal of the sensor at its input and delivers the desired higher one Clock frequency f-clock at its output.
  • This clock frequency is then applied to a two-phase clock generator 114, which is part of the SC filter 56.
  • This two-phase clock generator generates two signals shifted by the phases ⁇ 1 and ⁇ 2, which are used to actuate two switches via the lines shown as an arrow. These switches are used to temporarily connect a capacitor to the negative terminal of an operational amplifier 120 provided with a further capacitor 122.
  • the clock with which the switches are closed and opened in opposition determines the effective impedance of the capacitance at the input of the OpAmps, which in turn defines the center frequency of the bandpass filter. Center frequency of the filter leads.
  • the amplified sensor signal coming from the amplifier 54 is therefore applied to the input of the filter, and the filtered signal at the output of the filter 56 is then fed to the rectifier / integrator 58, in accordance with the circuit of FIG. 5a.
  • the described type of thread tension measurement can be carried out at all rotor frequencies that are clearly above the basic oscillation frequency of the thread guide, ie the natural oscillation frequency of the thread guide eyelet with suspension system. Normally, this fundamental frequency is around 10 to 20 Hz and the name "Significantly above" indicates frequencies that are around a factor of about 4 to 10 or higher.
  • the thread tension measuring method according to the present invention can be used with rotor speeds above 100 Hz, ie approximately 6000 rpm. Since such speeds are below the useful speeds of interest of the spindles of the ring spinning machine, this lower limit of the voltage evaluation does not represent any restriction in practice.
  • An advantage of a filter in the SC version is that the bandwidth of the passband of the filter is changed in proportion to the center frequency, in that the quality Q of the filter remains at least essentially constant, which benefits the signal evaluation.
  • the sensor in the form of the piezo film should be arranged in a plane containing the thread running direction or a plane parallel to it in such a way that the suspension of the thread guide executes elastic movements on both sides with respect to the thread running direction.
  • the thread running direction means, for example, the running direction of the thread between the pair of delivery rollers and the thread guide or the mean running direction of the thread within the thread balloon, which corresponds to the geometric axis of the thread balloon.
  • FIG. 9 shows a thread tension sensor that works differently than previously described.
  • FIG. 9 shows schematically that the thread guide eyelet 18 is attached to a web 92 of a thread guide holder 94 via a first load cell 90. More specifically, the thread guide eyelet is attached to one end face of the load cell 90, while the other end face of the load cell is attached to the web 92. On the other side of the web 92 there is a further load cell 96, which is also attached to the web 92 with its one end, while a compensation mass 98 with the mass m 2 is attached to the end of the load cell 96 facing away from the web. The load cell 96 is therefore aligned with the load cell 90, but is arranged on the other side of the web 92.
  • the thread guide eyelet 18 has a mass m 1.
  • Vibrations of the thread guide bracket 94 also lead to vibrations of the web. Due to the fluctuating acceleration of the masses m 1 and m 2, these vibrations lead to fluctuations in the forces on the load cells 90 and 96, so that these output signals U1 and U2 provide corresponding fluctuations.
  • A is the acceleration of the web 92 and F is the desired thread tension.
  • C1 and C2 are constants.
  • F is approximately equal to ⁇ U divided by C1.
  • m1 is constant and ⁇ U can be measured directly, a signal for the thread tension has been obtained by means of the invention.
  • a thread tension sensor of the type described last is therefore characterized in that a thread guide eyelet is attached via a load cell on one side of a web of a thread guide holder, that on the other side of the web a further load cell is attached to it and aligned with the first load cell, wherein a mass which compensates for the mass of the thread guide eyelet is attached to the second load cell, and that the output signals of the two load cells are fed to a differential circuit, the output signal of which is proportional to the thread tension.
  • PVDF piezo foils are available from various manufacturers, for example from the US company PENNWALT Corporation under the name "KYNAR" (registered trademark).
  • PVDF is an abbreviation for polyvinylidene fluoride, which belongs to the class of piezoelectric polymers.
  • Piezo foils of this type which are suitable for use with the present invention are preferably broadband with a quality factor Q tending towards zero.
  • 10A shows a particularly preferred embodiment for processing the signals from a group of sensors 52.1 to 52.n and from a reference sensor 52.r by means of a multiplexer which has 16 inputs. For this reason, n will normally have a maximum value of 15 and the further input will be used for the reference sensor. In practice, therefore, a blind thread guide is provided for each group of 15 real thread guides, i.e. of thread guides which actually carry a thread at a spinning station and the circuit according to FIG. 10A will be duplicated for each group of 15 real thread guides.
  • the sensor signals i.e. the signals coming from sensors 52.1 to 52.n are amplified, filtered and rectified in front of the multiplexer 150 by the circuit according to FIG. 5a.
  • the individual channels i.e. the signals connected from the sensors 52.1 to 52.n and 52.r to the analog / digital converter 152 in turn, the microcontroller 154 determining the sensor address for the multiplexer.
  • the levels of the sensors 52.1 to 52.n are compared in terms of amount with the reference level from the reference sensor 52.r, the difference corresponds to the thread tension and can be present either as a comparison value or after an appropriate calibration as an absolute value.
  • FIG. 10B shows a further improvement, according to which only one respective amplifier is assigned to each sensor, and the filter and the analog / digital converter are arranged after the multiplexer.
  • the signals from sensors 52.1 to 52.n and from reference sensor 52.r are amplified Multiplexer fed.
  • the microcontroller 154 gives the multiplexer the sensor address to be switched through.
  • the signal is filtered behind the multiplexer, for example by means of a circuit according to FIG. 8, and converted into a digital signal by the analog / digital converter 152.
  • This signal is then fed to the microcontroller 154.
  • a rectifier 156 is used between the filter and the A / D converter, which means that frequencies up to 300 Hz no longer have to be converted and evaluated , but only frequencies of approx. 1 Hz have to be measured.
  • the individual amplifier stages in / at the sensors can be replaced by a single amplification stage behind the multiplexer.
  • 10A and 10B describe circuit variants which enable the thread tension to be measured for all sensors.
  • Fig. 12 is concerned with determining whether the thread is broken at the respective spinning positions.
  • the sensor signals are processed here in parallel. They are in turn combined in groups 52.1 to 52.n together with a reference sensor 52.r. In this case, the total number of sensors in a group can be up to 32.
  • the signals are first amplified, filtered and rectified and then they are compared in respective comparators, which each correspond to the comparator 72 of FIG. 5c, with the reference signal from the reference sensor 52.r.
  • the output of the respective comparators 72 is actually a digital signal, since the comparator merely makes the decision whether the level from an active sensor is higher or lower than the reference level from the reference sensor. All signals are applied to the microcontroller 154 at parallel (port) inputs.
  • the advantage of this variant is that a simple and low-performing, ie inexpensive microcontroller can be used (for example, type 80C31 from Intel). A thread tension measurement is excluded here.
  • the output signals of the individual microcontrollers 154 which are each assigned to a single sensor group, all communicate with a serial data bus, for example of the type RS232 or RS485.
  • the microcontrollers (approx. 50 units per machine) are connected to a master controller via an advantageously serial data bus, which can also be formed, for example, by the 80C31 component (chip) from Intel.
  • This master controller is intended for the evaluation of the thread information and provides the machine control or a process control with compressed data, possibly statistically evaluated.
  • microcontrollers are distributed over two serial data buses, for example one data bus for each side of the machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
EP90125114A 1989-12-22 1990-12-21 Procédé pour l'obtention d'un signal représentant un fil en mouvement Expired - Lifetime EP0436204B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP94102738A EP0608001B1 (fr) 1989-12-22 1990-12-21 Métier à filer à anneaux avec dispositif de mesure de la tension d'un fil et application d'un dispositif de mesure de la tension d'un fil pour la commande d'un métier à filer à anneaux

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3942685 1989-12-22
DE3942685A DE3942685A1 (de) 1989-12-22 1989-12-22 Verfahren zur gewinnung eines fadenspannungssignals sowie fadensensor

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP94102738.5 Division-Into 1990-12-21

Publications (2)

Publication Number Publication Date
EP0436204A1 true EP0436204A1 (fr) 1991-07-10
EP0436204B1 EP0436204B1 (fr) 1995-02-08

Family

ID=6396263

Family Applications (2)

Application Number Title Priority Date Filing Date
EP94102738A Expired - Lifetime EP0608001B1 (fr) 1989-12-22 1990-12-21 Métier à filer à anneaux avec dispositif de mesure de la tension d'un fil et application d'un dispositif de mesure de la tension d'un fil pour la commande d'un métier à filer à anneaux
EP90125114A Expired - Lifetime EP0436204B1 (fr) 1989-12-22 1990-12-21 Procédé pour l'obtention d'un signal représentant un fil en mouvement

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP94102738A Expired - Lifetime EP0608001B1 (fr) 1989-12-22 1990-12-21 Métier à filer à anneaux avec dispositif de mesure de la tension d'un fil et application d'un dispositif de mesure de la tension d'un fil pour la commande d'un métier à filer à anneaux

Country Status (5)

Country Link
US (1) US5164710A (fr)
EP (2) EP0608001B1 (fr)
JP (1) JPH06229855A (fr)
CS (1) CS643490A2 (fr)
DE (3) DE3942685A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0616058A1 (fr) * 1993-03-17 1994-09-21 ATEX SpA Système de commande de la qualité du fil textile et du dispositif associé
DE4423548A1 (de) * 1993-08-25 1995-03-02 Rieter Ag Maschf Fadenüberwachungsvorrichtung

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US5136202A (en) * 1990-08-31 1992-08-04 Atochem North America, Inc Material sensor
ES2114194T3 (es) * 1993-04-29 1998-05-16 Barmag Barmer Maschf Metodo de control de un hilo en avance.
US5606113A (en) * 1994-09-06 1997-02-25 The University Of Chicago Acoustic methods to monitor sliver linear density and yarn strength
DE4443716A1 (de) * 1994-12-09 1996-06-13 Hottinger Messtechnik Baldwin Kraftmeßvorrichtung zur Messung der Zugspannung von Fäden, Bändern oder dergleichen sowie Federblatt und Verfahren zur Herstellung eines Federblatts
DE19614027A1 (de) * 1996-04-09 1998-01-22 Inst Textil & Faserforschung Verfahren zum Nachweis von untexturierten Garnabschnitten in texturierten Filamentgarnen mittels Bestimmung hochfrequenter Fadenzugkraftsschwankungen
DE19625513A1 (de) * 1996-06-26 1998-01-02 Schlafhorst & Co W Verfahren und Vorrichtung zum Herstellen von Kreuzspulen
JP2000110039A (ja) * 1998-09-30 2000-04-18 Murata Mach Ltd 多重撚糸機
FI990651A (fi) * 1999-03-23 2000-09-24 Valmet Corp Menetelmä ja laitteisto paperi- tai kartonkirainan päänviennin suorittamiseksi
GB9910331D0 (en) * 1999-05-06 1999-06-30 Fibrevision Limited Yarn quality monitoring
DE19940161A1 (de) 1999-08-25 2001-03-01 Schlafhorst & Co W Vorrichtung zum Abgleich eines Fadenzugkraftsensors
DE10249278A1 (de) * 2002-10-23 2004-06-09 Memminger-Iro Gmbh Fadenspannungssensor
EP1707523A1 (fr) * 2005-03-31 2006-10-04 Schärer Schweiter Mettler AG Méthode et dispositif pour rebobiner des fils textiles
WO2007056883A2 (fr) * 2005-11-18 2007-05-24 Uster Technologies Ag Procede pour caracteriser un file a effets
JP4931069B2 (ja) * 2007-06-08 2012-05-16 株式会社豊田中央研究所 糸張力検出器及びジェットルームにおける緯糸張力検出装置
JP5838768B2 (ja) 2011-11-30 2016-01-06 ソニー株式会社 検知装置、受電装置、非接触電力伝送システム及び検知方法
CN104328549B (zh) * 2013-01-29 2016-08-17 潍坊医学院 一种用于减少细纱机纱线断头的控制方法及装置
CN107190377B (zh) * 2017-07-10 2022-08-26 江南大学 在线检测环锭细纱机纺纱张力的装置及方法
CN111411429A (zh) * 2020-04-01 2020-07-14 东华大学 一种四罗拉环锭细纱机的须条检测装置

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US3968637A (en) * 1973-08-06 1976-07-13 Akzona Incorporated Yarn break detection by means of triboelectrical noise signal
GB2023671A (en) * 1978-05-16 1980-01-03 Kitamura S Detecting yarn breaks in spinning machines
US4182167A (en) * 1978-09-07 1980-01-08 Toray Industries, Inc. Yarn tension meter
DE3721298A1 (de) * 1986-07-16 1988-02-04 Textima Veb K Fadenlaufsensor, insbesondere fuer ringspinnmaschinen
DE3813707A1 (de) * 1987-04-28 1988-11-17 Elitex Zavody Textilniho Zugkraftmesser fuer textilfaeden

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0616058A1 (fr) * 1993-03-17 1994-09-21 ATEX SpA Système de commande de la qualité du fil textile et du dispositif associé
DE4423548A1 (de) * 1993-08-25 1995-03-02 Rieter Ag Maschf Fadenüberwachungsvorrichtung

Also Published As

Publication number Publication date
DE59010879D1 (de) 1999-09-02
CS643490A2 (en) 1991-10-15
DE3942685A1 (de) 1991-06-27
EP0436204B1 (fr) 1995-02-08
US5164710A (en) 1992-11-17
JPH06229855A (ja) 1994-08-19
EP0608001A1 (fr) 1994-07-27
DE59008432D1 (de) 1995-03-23
EP0608001B1 (fr) 1999-07-28

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