EP0616058A1 - Système de commande de la qualité du fil textile et du dispositif associé - Google Patents

Système de commande de la qualité du fil textile et du dispositif associé Download PDF

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Publication number
EP0616058A1
EP0616058A1 EP94101790A EP94101790A EP0616058A1 EP 0616058 A1 EP0616058 A1 EP 0616058A1 EP 94101790 A EP94101790 A EP 94101790A EP 94101790 A EP94101790 A EP 94101790A EP 0616058 A1 EP0616058 A1 EP 0616058A1
Authority
EP
European Patent Office
Prior art keywords
yarn
arm
quality
control
piezoelectric sensor
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
EP94101790A
Other languages
German (de)
English (en)
Other versions
EP0616058B1 (fr
Inventor
Paolo Savio
Mario Liani
Bruno Marcon
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.)
Atex SpA
Original Assignee
Atex SpA
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 Atex SpA filed Critical Atex SpA
Publication of EP0616058A1 publication Critical patent/EP0616058A1/fr
Application granted granted Critical
Publication of EP0616058B1 publication Critical patent/EP0616058B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D01H13/16—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
    • 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
    • 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
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • This invention concerns a system to control the quality of yarn and also a relative device, as set forth in the respective main claims.
  • the system to control the quality of yarn according to the invention is applied advantageously to the textile field and, to be more exact, to single-twist or two-for-one twisting frames as well as ring spinning machines.
  • the system to control the quality of yarn according to the invention enables anomalies to be detected and signalled in the yarn unwound from the twisting frame or spinning machine and the take-up of yarn on the yarn package or spindle to be halted.
  • This invention can be applied to yarns made of any type of fibres, whether they be natural or manmade, continuous or discontinuous, of a staple length for wool or cotton.
  • the invention can be employed on all existing textile machines and can be used for yarns of various materials and dimensions without being modified.
  • the yarn unwinding from the yarn package passes through a yarn-guide loop, which is generally located above and on the same axis as the spindle and has the task of limiting the balloon created by the centrifugal force generated by the rotation of the spindle.
  • the yarn which has already left the yarn-guide loop is made to cooperate with a feeler device, which includes a piezoelectric sensor that senses the tension of the yarn and converts that tension into an electrical impulse, which is sent to a suitable signalling and control device.
  • This feeler device entails the drawback that it can only detect anomalies arising from the complete or partial breakage of the yarn since a lack of yarn leads to a lack of the signal sent by the feeler device to the signalling and control device.
  • the feeler device cannot signal any other faults in the yarn which would make unsatisfactory the quality of the yarn produced.
  • FR-A-2.267.399 discloses a yarn-guide loop having a reduced section, which is caused to cooperate with a coil and affects the magnetic field produced by the coil. This document teaches only the monitoring of the speed of rotation and not the tension of the yarn, nor can it be deemed that, if this document is combined with DE-A-4.010.318, it is possible to arrive at the invention now under examination, for the working concepts are different.
  • FR-A-2.267.399 mentions the use of a transducer of a type different from the coil but gives no information about how this different transducer should work nor how it should be installed.
  • GB-A-2,023,671 discloses another form of embodiment of a device that detects breakage of the yarn running in spinning machines, the device comprising a piezoelectric sensor fitted to the yarn-guide loop, but in this patent the piezoelectric sensor is fitted resiliently and removably to a small supporting plate pivoted on a supporting bracket installed on the spinning machine.
  • the intermediate connecting elements may generate their own vibrations, and therefore the electrical output signal is disturbed and for this reason can be analysed only as a presence or absence of a signal.
  • the detector device can signal only the breakage of the yarn and cannot give information about other types of faults which may be included in the yarn running through.
  • feeler devices of the state of the art do not enable these types of shortcomings to be identified and lead to the production of yarns of a low quality.
  • the feeler devices of the state of the art do not enable the inclusion of lumps in the unwinding yarn to be signalled, and therefore these lumps remain in the yarn produced, which is therefore of a low quality.
  • One purpose of the invention is to provide a yarn quality control system which makes possible the detection and signalling of anomalies in the yarn such as even partial breakage of the yarn, unions of pluralities of yarns, loss of twist or complete lack of twist in the yarn produced.
  • the system to control the yarn according to the invention enables also the inclusion of lumps in the yarn passing through to be detected.
  • a further purpose of the invention is to reduce to a minimum the number of contacts between the yarn and rigid elements against which the yarn runs so as to guide the yarn and/or ensure the desired tension of the yarn and/or to ascertain the presence or absence of yarn.
  • the yarn quality control system according to the invention may be combined with a yarn shearing device which is actuated automatically as soon as the yarn quality control system according to the invention detects one of the above anomalies.
  • the applicants therefore have the purpose of achieving a yarn quality control system the sensor of which makes possible the detection of the speed of rotation of the balloon and of the tension of the yarn or yarns with which the sensor cooperates without thereby introducing further elements in contact with the yarn running through.
  • the yarn quality control device is solidly fixed to the arm bearing the yarn-guide loop through which the yarn, or yarns, being wound runs, or run.
  • one single simple element performs a double function with a resulting saving of the costs of materials and of the assembly of the component parts and also a reduction of materials and of the time involved in installation of the device on the machine.
  • the yarn quality control system comprises also a sensor of a piezoelectric type solidly associated with the yarn-guide loop so as to form a continuous assembly together with the arm that bears the yarn-guide loop.
  • the arm bearing the yarn-guide loop includes at least one sensor of a piezoelectric type solidly fitted directly to the arm, and advantageously on the perimeter of the arm, and arranged along the arm.
  • a desired reduction of the cross section of the arm is included in cooperation with the piezoelectric sensor so as to amplify the oscillations and vibrations acting on the sensor.
  • the device according to the invention does not include additional elements to connect the piezoelectric sensor to the arm bearing the yarn-guide loop, and this situation reduces considerably the vibrations detected by the piezoelectric sensor, and thus the vibrations are substantially only those caused by the yarn or yarns running through the yarn-guide loop.
  • This feature enables an electrical signal emitted by the piezoelectric sensor to be obtained which is substantially free of disturbances due to additional mechanical connecting elements.
  • this signal can therefore be analysed not only as a presence or absence of a signal of detection of breakage of the yarn but also as regards its own characteristics such as amplitude and frequency in obtaining further information about the yarn or yarns running through the yarn-guide loop.
  • the device according to the invention can be fitted readily and quickly to new and existing machines since it is installed to form one single body with the arm bearing the yarn-guide loop.
  • the yarn running through the yarn-guide loop exerts thereupon a centrifugal force, the point of application of which coincides with the point of contact between the yarn and the yarn-guide loop and therefore can move around the circumference of that loop.
  • this centrifugal force generates on the yarn-guide loop oscillations and vibrations, which affect the arm bearing the yarn-guide loop and are transmitted thereby to the piezoelectric sensor and converted thereby into an electrical signal.
  • the piezoelectric sensor is fitted to the arm so as to form continuity therewith, it is possible to detect not only oscillations and vibrations but also the axial stresses of tension or compression exerted by the yarn on the yarn-guide loop, these stresses arising from those occurring in the arm.
  • these electrical signals generated by the mechanical vibration transmitted by the arm to the piezoelectric sensor are amplified and freed of spurious signals, thus providing a signal which is a function of the speed of rotation of the balloon and of the tension of the yarn running through.
  • the electrical signal leaving the filter means is converted into impulses to control the speed of rotation and into voltage to control the tension of the yarn.
  • a suitable signal is generated which actuates an acoustic and/or visual warning circuit or a stop signal.
  • This same signal may also actuate a yarn shearing means which has the task of stopping take-up of yarn in the event of anomalies.
  • this signal is processed and examined so as to generate a signal which represents the average tension of the yarn.
  • This average tension is processed to find its differential variations as compared to a pre-set value.
  • a suitable signal is generated which actuates an acoustic and/or visual warning circuit or a stop signal or else a signal to shear the yarn running through.
  • the signal is associated with an efficient enough filter means, it is also possible to detect the inclusion of lumps in the yarn running through and thus actuate the warning, stopping or shearing means.
  • the reference number 10 in the attached figures denotes generally a device to control the quality of yarn according to the invention.
  • the purpose of this invention is to provide a yarn quality control device 10 having the task of a yarn-guide loop 11 and of a detector of anomalies in yarn 12 running through.
  • the anomalies which can be detected by this yarn quality control device 10 according to the invention may be various and may include a lack of yarn 12, a variation in the speed of rotation, a variation in the tension of the yarn 12, the inclusion of lumps in the yarn running through and the union of undesired yarns 12.
  • a further purpose of the invention is to provide a quality control device 10 which not only signals the presence of such anomalies but is also able to stop the take-up of yarn 12 when one or another of those anomalies occurs.
  • the quality control device 10 is used with a yarn 12 running in spinning machines or in single-twist or two-for-one twisting frames and makes possible the detection of loss of twist due to spindle slip 15 or of lack of twist in the yarn 12 owing to breakage of the transmission belt.
  • the yarn quality control device 10 enables the lack of one of the yarns 12 and also the union of undesired yarns 12 to be detected.
  • the yarn 12 leaving the spindle 15 in rotation is made to cooperate with the yarn-guide loop 11 located above and on the same axis as the spindle 15 so as to limit the balloon generated by that rotation.
  • the yarn quality control device 10 includes at least one piezoelectric sensor 13 firmly associated with an arm 14 that bears the yarn-guide loop 11 (Fig.6) so as to form a continuous extension of that arm 14.
  • the piezoelectric sensor 13 is fitted firmly, and without additional connecting elements, to the arm 14 bearing the yarn-guide loop 11 and advantageously on the perimeter of, and along, that arm.
  • the piezoelectric sensor 13 converts into electrical impulses the oscillations and vibrations generated by the yarn 12 running through the yarn-guide loop 11.
  • the piezoelectric sensor 13 is connected by connecting cables 19 to a data processing and control means 17.
  • the arm 14 bearing the yarn-guide loop 11 has advantageously a reduced cross-section coinciding with the piezoelectric sensor 13.
  • the reduced cross-section is provided by a narrowing notch 43, which may be on the same side as that to which the piezoelectric sensor 13 is fitted or on the opposite side and substantially corresponding to the lengthwise point of application of the piezoelectric sensor 13 (see Figs.4).
  • the piezoelectric sensor 13 cooperates advantageously with a surface or hollow 18, which contains the sensor 13 lengthwise.
  • a plurality of piezoelectric sensors 13 are arranged on the periphery of the arm 14 according to two or more cartesian axes for instance so as to detect the oscillations of the yarn-guide loop 11 on different planes.
  • the piezoelectric sensors 13 are two in number arranged at 90° to each other and enable the oscillations of the yarn-guide loop 11 to be detected on two planes at a right angle to each other.
  • the arm 14 contains reductions of its cross-section or hollows 18 coinciding advantageously with the various piezoelectric sensors 13; these reductions of cross-section are associated with a coordinated series of notches 43 arranged in suitable positions with the piezoelectric sensors 13.
  • These notches 43 are intended to accentuate the vibrations and oscillations of the yarn-guide loop 11 sensed by the piezoelectric sensors 13 and therefore to increase the sensitivity of the sensors 13.
  • the piezoelectric sensor 13 generates an electrical signal 16, which is processed by an appropriate data processing means 17 which, in the event of anomalies, generates a warning signal 35a, as will be described better in the description that follows.
  • the arm 14 bearing the yarn-guide loop 11 includes at an intermediate lengthwise position a hollow 18 in which the piezoelectric sensor 13 is fitted.
  • the piezoelectric sensor 13 is associated with connecting cables 19, which are connected to the data processing and control means 17.
  • the arm 14 contains an axial bore 20, through which the connecting cables 19 are passed.
  • a covering element 21 consisting of a slidable sleeve 25 cooperates with the hollow 18 so as to protect the piezoelectric sensor 13 against any impacts.
  • the slidable sleeve 25 includes positioning and clamping means 22, which in this case consist of an annular ledge 23 that cooperates with an annular groove 24 of a mating shape machined in the arm 14 bearing the yarn-guide loop 11 (Fig.4b).
  • FIGs.4 show the narrowing notch 43 machined in the arm 14 on the opposite side to, and corresponding to, the hollow 18.
  • the covering element 21 consists of the sleeve 25, which has an outer diameter equal to the outer diameter of the arm 14 and cooperates with a mating seating 26 machined circumferentially in the arm 14 and corresponding with the hollow 18.
  • the sleeve 25 contains a separating slit 27 (Fig.5a) extending along its whole length so as to enable the sleeve 25 to be deformed and enlarged while being fitted to the arm 14.
  • Fig.1 shows a possible working diagram of the control device 10 according to the invention; this is described in greater detail hereafter.
  • the piezoelectric sensor 13 is stimulated by the oscillations and vibrations caused by the yarn 12 running through the yarn-guide loop 11; these vibrations and oscillations are transmitted by the yarn-guide loop 11 to the arm and thence, by transfer, to the piezoelectric sensor 13, which generates an electrical signal, which is amplified by an amplifier 28 and treated by a band-pass filter 29, which eliminates the noises of the mains frequency and the noises of high frequencies due to spurious oscillations of the yarn 12.
  • the sinusoidal output signal 30 of the band-pass filter 29 is characterised by a frequency corresponding to the speed of rotation of the balloon and therefore of the spindle 15 and by an amplitude proportional to the tension of the sliding yarn 12.
  • the sinusoidal output signal 30 is converted into impulses by an impulse shaping means 31. These impulses are then counted and their value is compared with a value of rotation speed by a first comparator 32, which generates a speed differential signal 33 which is sent to a warning circuit 34.
  • the warning circuit 34 sends a first actuation signal 35a, which actuates an acoustic and/or visual alarm device 36 or a blocking device, which is not shown here.
  • warning circuit 34 sends also a second actuation signal 35b, which actuates a yarn shearing means 37, which interrupts the take-up of yarn 12.
  • the sinusoidal output signal 30 is converted into direct current voltage by a rectifier 38 equipped with a low pass filter 39, which enables the voltage fluctuations to be eliminated by generating a voltage signal 40 which represents the average tension of the yarn 12.
  • the voltage signal 40 is then processed by a second comparator 41, which generates a voltage differential signal 42 that is sent to the warning circuit 34.
  • the warning circuit 34 sends a first actuation signal 35a, which actuates the acoustic and/or visual alarm device 36 or a blocking device, which is not shown here.
  • warning circuit 34 sends a second actuation signal 35b, which actuates the yarn shearing means 37, which interrupts the take-up of yarn 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Quality & Reliability (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Looms (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Coating With Molten Metal (AREA)
EP94101790A 1993-03-17 1994-02-07 Système et dispositif de commande de la qualité de fil textile Expired - Lifetime EP0616058B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD930044A IT1262088B (it) 1993-03-17 1993-03-17 Sistema di controllo qualita' filato e relativo dispositivo
ITUD930044 1993-03-17

Publications (2)

Publication Number Publication Date
EP0616058A1 true EP0616058A1 (fr) 1994-09-21
EP0616058B1 EP0616058B1 (fr) 1997-07-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP94101790A Expired - Lifetime EP0616058B1 (fr) 1993-03-17 1994-02-07 Système et dispositif de commande de la qualité de fil textile

Country Status (5)

Country Link
EP (1) EP0616058B1 (fr)
AT (1) ATE156203T1 (fr)
DE (1) DE69404513T2 (fr)
ES (1) ES2107062T3 (fr)
IT (1) IT1262088B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5718854A (en) * 1996-09-27 1998-02-17 E. I. Du Pont De Nemours And Company Detection of broken filaments
EP0990721A1 (fr) * 1998-09-30 2000-04-05 Murata Kikai Kabushiki Kaisha Machine de torsion multiple
US6099963A (en) * 1999-03-18 2000-08-08 Alliedsignal Inc. Sizeless yarn, a method of making it and a method of using it
ES2154549A1 (es) * 1998-05-20 2001-04-01 Pinter Sa Dispositivo para la deteccion de roturas de hilos en maquinas continuas de hilar.
EP1707523A1 (fr) * 2005-03-31 2006-10-04 Schärer Schweiter Mettler AG Méthode et dispositif pour rebobiner des fils textiles

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2114468B1 (es) * 1995-11-24 1999-01-16 Univ Catalunya Politecnica Procedimiento y dispositivo de ajuste de la torsion del hilado en una tobera vortex de hilatura.
IT202200006281A1 (it) 2022-03-30 2023-09-30 Savio Macch Tessili Spa Unità di ritorcitura con sensore di controllo di rottura di un filo a funzionamento stand-alone e metodo di rilevamento della rottura di un filo in ritorcitura

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2267399A1 (fr) * 1974-04-13 1975-11-07 Palitex Project Co Gmbh
GB2023671A (en) * 1978-05-16 1980-01-03 Kitamura S Detecting yarn breaks in spinning machines
DE4010318A1 (de) * 1989-03-31 1990-10-04 Murata Machinery Ltd Vorrichtung zum erfassen eines einzelfadenbruches in einer doppeldrahtzwirnmaschine
EP0436204A1 (fr) * 1989-12-22 1991-07-10 Maschinenfabrik Rieter Ag Procédé pour l'obtention d'un signal représentant un fil en mouvement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2267399A1 (fr) * 1974-04-13 1975-11-07 Palitex Project Co Gmbh
GB2023671A (en) * 1978-05-16 1980-01-03 Kitamura S Detecting yarn breaks in spinning machines
DE4010318A1 (de) * 1989-03-31 1990-10-04 Murata Machinery Ltd Vorrichtung zum erfassen eines einzelfadenbruches in einer doppeldrahtzwirnmaschine
EP0436204A1 (fr) * 1989-12-22 1991-07-10 Maschinenfabrik Rieter Ag Procédé pour l'obtention d'un signal représentant un fil en mouvement

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5718854A (en) * 1996-09-27 1998-02-17 E. I. Du Pont De Nemours And Company Detection of broken filaments
ES2154549A1 (es) * 1998-05-20 2001-04-01 Pinter Sa Dispositivo para la deteccion de roturas de hilos en maquinas continuas de hilar.
EP0990721A1 (fr) * 1998-09-30 2000-04-05 Murata Kikai Kabushiki Kaisha Machine de torsion multiple
US6099963A (en) * 1999-03-18 2000-08-08 Alliedsignal Inc. Sizeless yarn, a method of making it and a method of using it
US6413452B1 (en) 1999-03-18 2002-07-02 Alliedsignal Inc. Method of making sizeless yarn
US6796337B2 (en) 1999-03-18 2004-09-28 Alliedsignal Inc. Sizeless yarn, a method of making it and a method of using it
EP1707523A1 (fr) * 2005-03-31 2006-10-04 Schärer Schweiter Mettler AG Méthode et dispositif pour rebobiner des fils textiles
WO2006103001A1 (fr) * 2005-03-31 2006-10-05 SSM Schärer Schweiter Mettler AG Procede et dispositif de rebobinage de fils

Also Published As

Publication number Publication date
ATE156203T1 (de) 1997-08-15
ITUD930044A1 (it) 1994-09-17
ITUD930044A0 (it) 1993-03-17
EP0616058B1 (fr) 1997-07-30
DE69404513D1 (de) 1997-09-04
IT1262088B (it) 1996-06-19
DE69404513T2 (de) 1998-02-19
ES2107062T3 (es) 1997-11-16

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