EP1859085A1 - Machine a filer a jet d'air avec surveillance du processus de filature par des capteurs - Google Patents

Machine a filer a jet d'air avec surveillance du processus de filature par des capteurs

Info

Publication number
EP1859085A1
EP1859085A1 EP06705394A EP06705394A EP1859085A1 EP 1859085 A1 EP1859085 A1 EP 1859085A1 EP 06705394 A EP06705394 A EP 06705394A EP 06705394 A EP06705394 A EP 06705394A EP 1859085 A1 EP1859085 A1 EP 1859085A1
Authority
EP
European Patent Office
Prior art keywords
air
spinning
sensor
fiber
machine according
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.)
Pending
Application number
EP06705394A
Other languages
German (de)
English (en)
Inventor
Volker Jehle
Philipp Gautschi
Gerd Stahlecker
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
Priority to EP06705394A priority Critical patent/EP1859085A1/fr
Publication of EP1859085A1 publication Critical patent/EP1859085A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • D01H13/20—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to excessive tension or irregular operation of apparatus
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
    • D01H1/11—Spinning by false-twisting
    • D01H1/115—Spinning by false-twisting using pneumatic means

Definitions

  • the present invention relates to an air-spinning machine having a plurality of spinning stations according to the preamble of patent claim 1.
  • Air-jet spinning machines have a multiplicity of spinning stations. In each spinning station, a yarn is spun from a fed longitudinal fiber structure. The fiber longitudinal structure is first refined, that is, the amount of fiber per unit length is reduced by delay. Then the refined fiber strand is spun by twisting into a yarn. The twist distribution is done with an air vortex.
  • FIG. 1 A parallel oriented fiber structure 27 is sucked in via a fiber guiding element 20 through a negative pressure generated by an air vortex in the vortex chamber 29.
  • the spinning of the yarn 25 is carried out by the air vortex.
  • the free fiber ends 26 of the fiber structure 27 are detected by the incoming air and wrapped around the core of said fiber structure 27.
  • a small part of the fibers, which are predominantly short fibers, are not incorporated, but are sucked off via an air duct 19 (not shown in FIG. 1).
  • both the suction of the fibers by the fiber guiding element 20 and the degree of wrapping are of particular importance.
  • the present invention is therefore based on the object of specifying an air spinning machine with spinning stations, in which a disturbance of the spinning process is detected in order to detect the further spinning of unusable yarn very early and to terminate a supposedly "orderly" spinning process.
  • the inventive air-jet spinning machine according to the type mentioned in the preamble of claim 1, which is assigned to the spinning stations at least one associated with a monitoring unit sensor, the physical size of the air vortex and / or yarn to be spun detected, and that in the Monitoring unit means are provided to monitor the timing of the detected large and / or analyze and / or represent and / or perform a comparison of the detected sizes with a definable setpoint or setpoint, is an individual spinning stations individual monitoring of the spinning process create, which detects a deterioration of the spinning process due to an impairment of the air vortex or no longer sufficient Umwindeparameter in time to prevent the production of rejects.
  • the sensed parameters may also be used by employing suitable means to control or control the spinning process, for example by changing the delivery speed or the pressure of the air supplied via the air nozzles 23.
  • the Umwindungsparameter to be detected of the yarn to be spun are in particular:
  • Fiber speed Speed of the fiber sun, hereinafter referred to as "fiber speed"
  • the pressure to be detected refers to the air vortex and the suction and includes in particular the following measurements: - Measurement of the air pressure in the vortex chamber;
  • the above-mentioned detected quantities are fed to a monitoring unit and monitored with regard to the temporal behavior or compared with respect to predetermined desired values.
  • a deviation outside of a certain tolerance range around the stated nominal value allows the statement that the spinning process is no longer running properly.
  • monitoring temporal behavior both a slow change and a sudden change can be detected.
  • Particularly advantageous is the recognition of a slow change. This allows the corrective intervention in the spinning process, so that the production of yarn with certain quality requirements can be continued.
  • FIG. 1 Perspective view of a spinning station with fiber guide element and spindle
  • Figure 2 is a sectional view of a vortex chamber with the arrangement of sensors;
  • Figure 3 a representation of a stationary course of the detected physical
  • FIG. 3b shows the representation of a non-stationary course of the detected physical quantity.
  • FIG 4 Schematic representation of the spinning station with upstream and downstream elements of a spinning unit to which a further sensor is attached
  • Figure 1 shows to explain the following facts a perspective view of a known spinning box 10 - hereinafter referred to as spinning station 10 - with a fiber guide element 20 and a spindle 22.
  • a fiber strand 27 is guided by the fiber guide member 20 in the swirl chamber 29 to the spindle mouth 24.
  • FIG. 2 shows from the context of FIG. 1 the specific arrangement of sensors at a spinning station in one embodiment of the spinning machine according to the invention. It should be noted that the type and number of sensors shown can be freely combined.
  • a so-called fiber sun 26 is formed, the individual fibers of which are wound around the core of the yarn 25 to be spun.
  • the number of convolutions of the fibers around the (actually untwisted) fiber core is a measure of the fiber strength and determines among other things the quality of the spun yarn.
  • the number of turns is directly proportional to the so-called "fiber speed", ie the higher the fiber sun speed is, the higher the number of fiber turns around the core of the yarn, especially at a lower fiber speed compared to a nominal value In extreme cases, this leads to so-called "corkscrews". For an optimal spinning process, it is therefore important to keep the fiber speed at a desired set point constant.
  • the presence of the fiber sun is detected with a light barrier 2.
  • a signal can be tapped, which includes a temporal image of the sequence of the individual fibers of the fiber sun.
  • This signal is fed to a monitoring unit (not included in the figures), in which this temporal image is processed by signal technology in order to determine the current fiber-sonic speed and, if necessary, to compare this with a desired value.
  • the desired value is preferably adjustable.
  • Means may be provided, from the result of the comparison, the delivery speed and / or the pressure Adjust the air supplied to the swirl chamber 29 accordingly. Depending on the result of the comparison, it may also be provided to interrupt the spinning process at the relevant spinning station 10 by the monitoring unit and to signal this, so that this spinning station can be inspected by operating personnel and, if necessary, brought back into order.
  • the fiber speed can also be detected by other measuring methods, e.g. by the detection of structure-borne noise or the measurement of the torque M. occurring at the spindle 22.
  • the rotating fibers generate vibrations which manifest themselves as so-called structure-borne noise and which correlate with the actual fiber-sonic speed.
  • sensors 4 e.g. piezoelectric sensors 4
  • these vibrations are recorded and fed to the monitoring unit.
  • these oscillations are analyzed with regard to their frequency or their time course. A gradual or even abrupt change in the vibration has as its cause a corresponding speed change. From the analysis of the aforementioned change can therefore be concluded that a disturbance of the spinning process. In the case of a gradual or slow change, it is thus possible to intervene in good time so that unusable yarn 25 is not produced before a yarn breakage.
  • Change in the fiber sun speed correlates directly with the torque exerted on the spindle 22.
  • a detected in the monitoring unit change of the torque over the time course and / or against a predetermined and preferably adjustable setpoint triggers over the Monitoring unit to intervene in the spinning process either correcting or terminating.
  • the number of fibers or fiber mass in the fiber sun 26 also forms an important factor for the quality of the yarn 25 to be spun. If the number of fibers in the fiber sun 26 increases, the proportion of binder fiber likewise increases and has a higher strength of the yarn to be spun 25 result. However, it should be noted that the consistency of the yarn quality is of particular importance.
  • the number of fibers - not to be confused with the fiber speed of the sun - can now also be detected with the above sensors 2, 4 and 3, namely: with a light barrier 2, with a vibration sensor 4 or a torque transducer 3.
  • a decrease in the fiber mass of the fiber sun 26 has e.g. a lower torque result and can thus also be detected due to the time course and / or due to a comparison with a predetermined setpoint.
  • spinning tension F s Another Umwindungsparameter the spun yarn and thus indicator for the spinning process is the so-called spinning tension F s (see Figure 2).
  • the fiber sun exerts due to the fiber friction occurring at the cone of the spindle 22 not only the torque M, but also causes the withdrawal of the spun yarn 25 from the thread withdrawal channel 30, a resistance - the so-called.
  • Spinning tension Fs - is opposed.
  • the term spinning tension Fs is thus understood to mean the force or withdrawal force to be specified in the units [N] or [cN] which has to be expended in order to remove the spun yarn 25.
  • the amount of the spinning tension Fs depends essentially on the fiber sun speed as well as the number of fibers, ie the fiber mass in the fiber sun 26, from.
  • the spinning tension F s is therefore also an indicator of the quality of the yarn 25 being spun.
  • the constancy of the spinning tension Fs is the measure for a uniformly spun yarn. Therefore, in a further preferred variant, the invention provides that a sensor for the yarn tension measurement is also provided.
  • the signal measured at the sensor for the thread tension measurement is preferably also supplied to the or a monitoring unit and there in terms of its analyzed over time.
  • a change in the spinning tension Fs correlates directly with a change in the spinning process, ie with a change in the fiber sun speed or the fiber mass in the fiber sun 26 (so-called fiber number).
  • a change in the spinning tension F s detected in the monitoring unit with respect to the time course and / or with respect to a predetermined and preferably adjustable set value triggers a reaction via the monitoring unit in order to also intervene in the spinning process either in a corrective or terminating manner.
  • the spinning tension F s is thus also used to monitor the spinning process.
  • a sensor 32 which is preferably designed as a force sensor (see FIG. 2) can be provided for the measurement of the spinning tension F s .
  • FIG. 4 shows a conceivable embodiment of the spin tension measurement according to the invention. The figure shows schematically a spinning unit with a drafting, the spinning unit 10, and a take-off roller pair 31.
  • the sensor 32 is provided on the take-off rollers 31 and at its (not shown) drive.
  • the take-off rollers 31 pull the spun yarn 25 from the yarn withdrawal channel 30 (not shown) of the spinning station 10. For this they must overcome the above-described, caused by the fiber sun, spinning tension Fs.
  • a measurement of the spinning tension F s on the take-off rollers 31 is therefore particularly advantageous (eg, by detecting the torque applied to these rollers, the spinning tension is easily calculable therefrom).
  • the signal measured at the sensor 32 for the thread tension measurement is then fed as described, preferably to a monitoring unit (not shown in the figure) and analyzed there with respect to its time course.
  • the monitoring unit can then trigger a reaction in the event of deviations of the detected signal from a desired value or from a desired time profile.
  • the spinning process can be monitored further by means of air pressure sensors 1a and 1b as follows:
  • a measurement of this (under) pressure and a temporal monitoring of the course of this pressure by means of a monitoring unit allows to detect occurring inhomogeneities of the spinning process.
  • FIG. 3 a shows a curve of a detected physical variable, which indicates a stationary state of the relevant spin process. Only when a certain number of values are within a fixed period of time and outside the tolerance range shown, is it to be concluded that the spinning process is no longer stationary.
  • FIG. 3b shows an example of a spinning process that is no longer stationary, wherein the variability of the detected quantities is measured in the evaluation unit. If this temporal variability is missing, it is to be concluded that the spinning process is no longer stationary and the control unit of the monitoring unit is to control the relevant spinning station in such a way that it is switched off and signaling is given to the operating personnel.
  • the teaching according to the invention can be further developed by a free combination of the sensors explained above since the detection of a detected physical quantity does not fundamentally affect the detection of another quantity to be detected.
  • the detection of the fiber sun with a light barrier affects the detection of structure-borne noise with a piezoelectric sensor 4 in any way.
  • vibration sensor sensor for measuring the vibrations, e.g. resulting from structure-borne noise

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Abstract

Pour les machines à filer à jet d'air, le tourbillon d'air et le guipage à travers les filaments déterminent la qualité du fil à filer (25) de façon décisive. L'invention vise à déceler des pertes de qualité à un stade précoce. A cet effet, l'invention propose une machine à filer à jet d'air présentant au moins un capteur (1a, 1b, 2, 3, 4) par station de filature, ce ou ces capteurs enregistrant une grandeur physique du tourbillon d'air et/ou un paramètre de guipage. Les grandeurs enregistrées sont évaluées dans une unité de surveillance, ce qui permet une commande du processus de filature.
EP06705394A 2005-03-16 2006-03-16 Machine a filer a jet d'air avec surveillance du processus de filature par des capteurs Pending EP1859085A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06705394A EP1859085A1 (fr) 2005-03-16 2006-03-16 Machine a filer a jet d'air avec surveillance du processus de filature par des capteurs

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP05005713 2005-03-16
CH16522005 2005-10-11
PCT/CH2006/000154 WO2006097008A1 (fr) 2005-03-16 2006-03-16 Machine a filer a jet d'air avec surveillance du processus de filature par des capteurs
EP06705394A EP1859085A1 (fr) 2005-03-16 2006-03-16 Machine a filer a jet d'air avec surveillance du processus de filature par des capteurs

Publications (1)

Publication Number Publication Date
EP1859085A1 true EP1859085A1 (fr) 2007-11-28

Family

ID=36569145

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06705394A Pending EP1859085A1 (fr) 2005-03-16 2006-03-16 Machine a filer a jet d'air avec surveillance du processus de filature par des capteurs

Country Status (3)

Country Link
EP (1) EP1859085A1 (fr)
JP (1) JP2008533318A (fr)
WO (1) WO2006097008A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007047853A1 (de) * 2007-11-23 2009-05-28 Rieter Ingolstadt Gmbh Vorrichtung und Verfahren zur Überwachung von Arbeitsstellen einer Textilmaschine sowie Textilmaschine
JP2009242972A (ja) * 2008-03-31 2009-10-22 Murata Mach Ltd 紡績装置
JP2017071882A (ja) * 2015-10-09 2017-04-13 村田機械株式会社 紡績機
EP3828325A1 (fr) * 2019-11-29 2021-06-02 Saurer Intelligent Technology AG Poste de filage et machine à filer à jet d'air comprenant un tel poste de filage et procédé de détermination d'une défaillance de la résistance à la traction d'un fil

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5940926B2 (ja) * 1980-06-26 1984-10-03 村田機械株式会社 糸状物体のバル−ン評価方法
DE3836481A1 (de) * 1988-10-26 1990-05-03 Schubert & Salzer Maschinen Verfahren und vorrichtung zum einstellen einer luftspinnvorrichtung
EP1072702B1 (fr) * 1999-07-28 2004-03-31 Murata Kikai Kabushiki Kaisha Dispositif de filage et procédé à filer
DE10201577A1 (de) * 2002-01-17 2003-07-31 Schlafhorst & Co W Spinnvorrichtung zur Herstellung eines gesponnenen Fadens mittels eines umlaufenden Luftstroms
JP2003278034A (ja) * 2002-03-20 2003-10-02 Murata Mach Ltd 紡績装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006097008A1 *

Also Published As

Publication number Publication date
JP2008533318A (ja) 2008-08-21
WO2006097008A1 (fr) 2006-09-21

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