EP0678601A2 - Banc d'étirage contrôlé - Google Patents

Banc d'étirage contrôlé Download PDF

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Publication number
EP0678601A2
EP0678601A2 EP95110073A EP95110073A EP0678601A2 EP 0678601 A2 EP0678601 A2 EP 0678601A2 EP 95110073 A EP95110073 A EP 95110073A EP 95110073 A EP95110073 A EP 95110073A EP 0678601 A2 EP0678601 A2 EP 0678601A2
Authority
EP
European Patent Office
Prior art keywords
drafting
draft
determining
control
information
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.)
Withdrawn
Application number
EP95110073A
Other languages
German (de)
English (en)
Other versions
EP0678601A3 (fr
Inventor
Giancarlo Dr. Mondini
Urs Dr. Meyer
Robert Moser
Jürg BISCHOFBERGER
Urs Keller
Erich Jornot
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.)
Maschinenfabrik Rieter AG
Original Assignee
Maschinenfabrik Rieter 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 Maschinenfabrik Rieter AG filed Critical Maschinenfabrik Rieter AG
Publication of EP0678601A2 publication Critical patent/EP0678601A2/fr
Publication of EP0678601A3 publication Critical patent/EP0678601A3/fr
Withdrawn legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G21/00—Combinations of machines, apparatus, or processes, e.g. for continuous processing

Definitions

  • the invention relates to the use of regulating drafting systems, i.e. Drafting systems in which the draft can be controlled or regulated in order to even out fluctuations in mass in a fiber structure.
  • Drafting systems i.e. Drafting systems in which the draft can be controlled or regulated in order to even out fluctuations in mass in a fiber structure.
  • Such drafting systems are often used in so-called regulating lines in short fiber spinning, but can also be used on cards, combing machines and combing preparation machines in short fiber spinning.
  • the same principles are of course also suitable for use in long-staple spinning.
  • fiber bundles are often subjected to a draft in a regulating drafting system in order to improve the uniformity of the bandage before feeding into the final spinning process.
  • At least the last regulating drafting device or the last uniformity regulation before spinning is intended as a control center, specifically for the uniformity of the intermediate products from the processing stages preceding and supplying the corresponding processing stage.
  • the route of the second passage serves as the stage which protects the final spinning stage from fluctuations in the uniformity of the preparation machines (blowroom, carding and combing).
  • a system according to DE-PS 32 37 371 belongs to this category, according to which a yarn produced by the nozzle spinning process is checked in operation both with respect to the spectrogram and with regard to the Uster value (unevenness coefficient). This identifies faults in the drafting system of the jet spinning machine itself, which can lead to the replacement of the defective parts. This procedure does not allow conclusions to be drawn about the running behavior of the preparation stages.
  • a proposal for monitoring a route can be found in EP 340 756.
  • limit values for a signal supplied by the outlet measuring element are to be determined, an alarm being triggered or the machine being switched off when a limit value is exceeded.
  • the product the fiber structure supplied
  • the product should be checked by the personnel.
  • this Checks should be concluded for measurement errors or control errors.
  • a second variant of the same proposal provides for the determination of limit values for the actuating signal determining the delay, the triggering of an alarm or the switching off of the machine likewise taking place when a limit value is exceeded.
  • the sliver should be checked by the staff, depending on the test results for errors in the infeed measuring system or in the production of the sliver material (i.e. in the processing machines in front of this drafting system).
  • the invention provides a regulating drafting device for fiber bundles, which is equipped with at least one warping field, a controllable or regulatable drive system for determining the warping height in said warping field, a programmable controller for the drive system and at least one sensor for determining the fiber mass passing through per unit length at a measuring point is.
  • the drafting system is characterized in that a warp-determining signal is stored in a memory of the control system over a certain period and information for adapting the drafting system and / or for assessing the quality of the fiber bundles is obtained from the stored values.
  • the information mentioned includes e.g. the CV value of the fiber bundle, the spectogram of the fiber bundle and / or the length variation curve of the fiber bundle.
  • the controller preferably comprises a digital signal processor e.g. the model 56001 from Motorola.
  • the delay-determined signal can be an output signal from a sensor or an actuating signal for the drive system. Is a signal "Defining default” in the sense of this invention if it exerts an indirect or direct influence on the default, even if other signals also exert such an influence.
  • the information can be obtained by said controller and / or by a process control system, in the latter case the stored values are preferably conveyed to the process control system via the controller, e.g. according to our Swiss patent application No. 1025 / 91-2 dated April 5, 1991.
  • Such information can only be obtained by the controller itself if this controller comprises a digital signal processor or a device with a similar or better computing power.
  • the sensor is preferably suitable for following short-wave mass fluctuations.
  • it is necessary to digitize them, which is done by periodic sampling.
  • the sampling rate is selected to be higher than 2000 Hz, preferably in the range 2500 to 3500 Hz.
  • Such a signal can be processed in the processor according to the Fast Fourier Transform method in order to enable spectral analysis.
  • the sampling rate of the control preferably remains constant; the speed of the material passing through is changeable.
  • the controller is preferably also provided with a sensor which reacts to the speed at which the material runs in, so that the control (despite the constant sampling rate) can perform a corrective action per incoming length unit.
  • Appropriate storage means are provided.
  • This preferred embodiment has the advantage that the information is obtained from signals which are also used to control the correction interventions, which increases the uniformity of the information content of the various signals.
  • the operator support provided on the basis of the signals obtained according to this invention is provided via the operator interface (operator consoles or operator panels) of the machines concerned, as described in the aforementioned PCT patent application PCT / CH 91/0097 is.
  • the operating support will not be treated as such here.
  • the remarks of PCT / CH 91/0097 are included in this description by this reference.
  • the signals obtained by this invention can be linked to a material flow tracking system in order to enable or provide a fault diagnosis.
  • a suitable material flow tracking is described in DE-A-40 24 307 dated July 31, 1990, but this invention is not restricted to use in such a combination.
  • the regulating drafting system can be used as the last stage before spinning that the results of the previous stages are checked here via the process control system and, if necessary, interventions in the preceding stages are initiated.
  • FIG. 1 shows a schematic representation of a regulating drafting system.
  • Figure 1 shows a schematic representation of an embodiment of the route according to our European patent application No. 0 411 379.
  • the fleece emerging from the route is thinner than the fleece of the fed tapes 215.1 - 215.6 and correspondingly longer. Because the warping processes can be regulated as a function of the cross-section of the fed tapes, the tapes or the fleece are made more uniform as they pass through the line, i.e. the cross-section of the emerging fleece is more uniform than the cross-section of the fed fleece or tapes .
  • the present route has a pre-default area 211 and a main delay area 212.
  • the belts 215.1-215.6 are fed into the line by two systems 201 and 202 of conveyor rollers.
  • a first system 201 consists, for example, of two rollers 201.1 and 201.2 between which the fed belts 215.1-215.6, which are combined to form a loose fleece, are transported.
  • a roller system 202 follows in the transport direction of the belts, which here consists of an active conveyor roller 202.1 and two passive conveyor rollers 202.2, 202.3.
  • the fed tapes 215.1-215.6 are brought together to form a fleece 216.
  • the two roller systems 201 and 202 of the feed are followed in the transport direction of the nonwoven 16 by a third system 203 of pre-drawing rollers 203.1 and 203.2, between which the nonwoven is transported further.
  • the peripheral speed V3 of the pre-drafting rollers is higher than that of the inlet rollers V 1.2 , so that the fleece 216 is stretched in the pre-drafting area 211 between the intake rollers 202 and the pre-drafting rollers 203, its cross section being reduced.
  • a pre-drawn fleece 217 is created from the loose fleece 216 of the fed tapes.
  • a further system 204 follows from the pre-drawing rollers 203 an active conveyor roller 204.1 and two passive conveyor rollers 204.2, 204.3 for further transport of the fleece.
  • the peripheral speed V4 of the conveyor rollers 204 for further transport is the same as V3 of the pre-drawing rollers 203.
  • the roller system for further transport 204 is followed by a fifth system 205 of main drafting rollers 205.1 and 205.2 in the transport direction of the fleece 217.
  • the main drafting rollers in turn have a higher surface speed V5 than the preceding transport rollers, so that the pre-drawn fleece 217 between the transport rollers 204 and the main drafting rollers 205 in the main drafting area 212 is further drawn to the finished drawn fleece, the fleece being brought together via a funnel T to form a belt .
  • the roller systems 201.2 and 204 are driven by a first servo motor 207.1, preferably via toothed belts.
  • the pre-drawing rollers 203 are mechanically coupled to the roller system 204, whereby the translation can be adjustable or a setpoint can be specified.
  • the gear (not visible in the figure) determines the ratio of the peripheral speeds of the feed rollers (V in ) and the peripheral speed V3 of the pre-drafting rollers 203.1, 203.2, hence the pre-drafting ratio.
  • the roller systems 205 and 206 are in turn driven by a servo motor 207.2.
  • the inlet rollers 201.1, 201.2 can also be driven by the first servo motor 207.1 or optionally by an independent motor 207.3.
  • the two servomotors 207.1 and 207.2 each have their own controller 208.1 and 208.2.
  • the regulation takes place via a closed control loop 208.a, 208.b or 208.c, 208.d.
  • the actual value of one servo motor can be transmitted to the other servo motor in one or both directions via a control connection 208.e so that everyone can react accordingly to deviations from the other.
  • the mass or a quantity proportional to the mass e.g. the cross section of the fed tapes 215.1 - 215.6 measured by an inlet measuring element 209.1.
  • the cross section of the emerging strip 216 is then measured by an outlet measuring element 209.2.
  • a central computer unit 210 transmits an initial setting of the target size for the first drive via 210.a to the first controller 208.1.
  • the measured variables of the two measuring elements 209.1, 209.2 are continuously transmitted to the central computer unit via the connections 209.a and 209.b during the stretching process.
  • the setpoint for the servo motor 208.2 is determined in the central computer unit and any other elements. This setpoint is continuously given to the second controller 208.2 via 210.b.
  • this control system the "main control"
  • fluctuations in the cross-section of the fed strips 215.1-215.6 can be compensated for by appropriate control of the main drafting process or the strip can be made more uniform.
  • the central control 210 of the machine itself is assigned a memory 220, where the or certain signals of the drafting system control system are stored for evaluation. If the operating speed of the central processor in the controller 210 is high enough, such a high sampling rate can be selected that a spectrogram of the input signal (from sensor 209.1), the output signal (from sensor 209.2) and / or the control signals (to motors 207.1 and / or 207.2 emitted signals) can be obtained.
  • a drafting system control according to FIG. 1 is normally designed not to carry out a control intervention in the material (a change in the material processing) continuously, but rather after a certain interval.
  • the duration of this interval is preferably not chosen to be constant, but is adapted to the running-in speed in such a way that the interventions each at the end of a predetermined fleece length.
  • the arrangement shown can be supplemented by determining the running-in speed, for example, on the roller group 202, and using it to control the processing operations.
  • Storage means (not shown) are then necessary in the draft control system in order to store the control signals and to activate them at the right time.
  • the values contained in the memory 220 are not evaluated as a function of the running-in speed but according to the time.
  • the time functions are then converted into frequency functions using the Fast Fourier Transform method. The time required for this depends on the computing speed of the processor and the number of frequencies (or frequency ranges) that should be examined individually. For an adequate analysis of a template material, preferably at least 1024 individual frequency ranges are to be examined.
  • a data bus DB can be provided and the controller 210 can be provided with an interface SNM to this data bus, the computer PLR also comprising an interface SNR to the data bus.
  • raw data are not to be understood as the actual output signals of the appropriate sensors, but these signals can be processed by the machine control (at least for the transfer to the process control computer). It is important that the essential information content for the intended analysis is maintained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP95110073A 1990-06-25 1991-06-25 Banc d'étirage contrÔlé. Withdrawn EP0678601A3 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH2112/90 1990-06-25
CH211290A CH683347A5 (de) 1990-06-25 1990-06-25 Steuerung bzw. Regelung einer Faserverarbeitungsanlage.
EP19910910745 EP0489128A1 (fr) 1990-06-25 1991-06-25 Systeme de commande de processus pour une filature - signaux de commande en provenance de la station precedente

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP91910745.8 Division 1991-06-25

Publications (2)

Publication Number Publication Date
EP0678601A2 true EP0678601A2 (fr) 1995-10-25
EP0678601A3 EP0678601A3 (fr) 1996-01-24

Family

ID=4226156

Family Applications (2)

Application Number Title Priority Date Filing Date
EP95110073A Withdrawn EP0678601A3 (fr) 1990-06-25 1991-06-25 Banc d'étirage contrÔlé.
EP19910910745 Withdrawn EP0489128A1 (fr) 1990-06-25 1991-06-25 Systeme de commande de processus pour une filature - signaux de commande en provenance de la station precedente

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP19910910745 Withdrawn EP0489128A1 (fr) 1990-06-25 1991-06-25 Systeme de commande de processus pour une filature - signaux de commande en provenance de la station precedente

Country Status (5)

Country Link
EP (2) EP0678601A3 (fr)
JP (1) JPH05501289A (fr)
CH (1) CH683347A5 (fr)
CZ (1) CZ194491A3 (fr)
WO (1) WO1992000409A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0799916A3 (fr) * 1996-04-02 1998-11-25 Maschinenfabrik Rieter Ag Machine de peignage avec un banc d'étirage contrÔlé
WO1999058749A1 (fr) * 1998-05-13 1999-11-18 Maschinenfabrik Rieter Ag Machine traitant une matiere textile et dotee d'un bac d'etirage
WO2000052239A1 (fr) * 1999-03-04 2000-09-08 Zellweger Luwa Ag Procede et dispositif de controle de la qualite de bandes textiles
EP1205587A3 (fr) * 2000-11-10 2002-12-11 Maschinenfabrik Rieter Ag Procédé et dispositif pour filer un fil en filaments déchirables
WO2003085179A3 (fr) * 2002-04-04 2004-04-01 Rieter Ingolstadt Spinnerei Machine de preparation de filature
EP1513970B2 (fr) † 2002-06-20 2015-02-11 Rieter Ingolstadt GmbH Procede et dispositif d'interpretation de signaux issus d'un capteur dans une machine textile

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1057907A1 (fr) * 1999-05-31 2000-12-06 Barco N.V. Procédés et systèmes de controlle d'opération de filature
DE102020118298A1 (de) 2020-07-10 2022-01-13 Trützschler GmbH & Co Kommanditgesellschaft Vorrichtung zur Bestimmung der Kämmlingsmenge an einer Kämmmaschine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2734564A1 (de) * 1977-07-30 1979-02-08 Schubert & Salzer Maschinen Verfahren und vorrichtung zum herstellen eines garnes aus kaemmlingen
JPH0720800B2 (ja) * 1988-03-01 1995-03-08 村田機械株式会社 紡績工場における品質管理システム
DE3815200C2 (de) * 1988-05-04 1998-01-29 Truetzschler Gmbh & Co Kg Verfahren und Vorrichtung zur Überwachung des Vergleichmäßigens mindestens eines Faserverbandes in einem Regulierstreckwerk
DE58907408D1 (de) * 1988-12-22 1994-05-11 Rieter Ag Maschf Kämmaschine.
DE3924779A1 (de) * 1989-07-26 1991-01-31 Rieter Ag Maschf Verfahren und vorrichtung zum betrieb einer spinnereilinie
DE4103525A1 (de) * 1990-04-09 1991-10-10 Truetzschler & Co Vorrichtung zum verziehen von faserbaendern, z. b. aus baumwolle, chemiefaser u. dergl.

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0799916A3 (fr) * 1996-04-02 1998-11-25 Maschinenfabrik Rieter Ag Machine de peignage avec un banc d'étirage contrÔlé
WO1999058749A1 (fr) * 1998-05-13 1999-11-18 Maschinenfabrik Rieter Ag Machine traitant une matiere textile et dotee d'un bac d'etirage
US6393667B1 (en) 1998-05-13 2002-05-28 Maschinenfabrik Rieter Ag Machine with a drafting arrangement for processing textile material
WO2000052239A1 (fr) * 1999-03-04 2000-09-08 Zellweger Luwa Ag Procede et dispositif de controle de la qualite de bandes textiles
US6553826B1 (en) 1999-03-04 2003-04-29 Zellweger Luwa Ag Process and device for monitoring the quality of textile strips
EP1205587A3 (fr) * 2000-11-10 2002-12-11 Maschinenfabrik Rieter Ag Procédé et dispositif pour filer un fil en filaments déchirables
WO2003085179A3 (fr) * 2002-04-04 2004-04-01 Rieter Ingolstadt Spinnerei Machine de preparation de filature
EP1513970B2 (fr) † 2002-06-20 2015-02-11 Rieter Ingolstadt GmbH Procede et dispositif d'interpretation de signaux issus d'un capteur dans une machine textile

Also Published As

Publication number Publication date
WO1992000409A1 (fr) 1992-01-09
JPH05501289A (ja) 1993-03-11
CH683347A5 (de) 1994-02-28
CZ194491A3 (en) 1993-10-13
EP0489128A1 (fr) 1992-06-10
EP0678601A3 (fr) 1996-01-24

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