EP0357138A1 - Verfahren und Vorrichtung zur Überwachung des Spinngarnweges auf einer Open-end-Spinnmaschine - Google Patents

Verfahren und Vorrichtung zur Überwachung des Spinngarnweges auf einer Open-end-Spinnmaschine Download PDF

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Publication number
EP0357138A1
EP0357138A1 EP89202172A EP89202172A EP0357138A1 EP 0357138 A1 EP0357138 A1 EP 0357138A1 EP 89202172 A EP89202172 A EP 89202172A EP 89202172 A EP89202172 A EP 89202172A EP 0357138 A1 EP0357138 A1 EP 0357138A1
Authority
EP
European Patent Office
Prior art keywords
yarn
monitoring
winding
spinning
unit
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Withdrawn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
EP89202172A
Other languages
English (en)
French (fr)
Inventor
Francesco Ferro
Sergio Montali
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.)
Savio SpA
Savio Macchine Tessili SpA
Original Assignee
Savio SpA
Savio Macchine Tessili 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 Savio SpA, Savio Macchine Tessili SpA filed Critical Savio SpA
Publication of EP0357138A1 publication Critical patent/EP0357138A1/de
Withdrawn legal-status Critical Current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
    • D01H13/165—Photo-electric 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
    • 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
    • B65H63/0324—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 photo-electric sensing means, i.e. the defect signal is a variation of light energy
    • 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 relates to a method and device for continuously monitoring the path of yarn being wound in an open-end spinning station.
  • Open-end spinning machines are known in the spinning field, and in particular rotor spinners consisting essentially of a plurality of spinning units positioned in an adjacent progression.
  • Each spinning unit comprises a feed device for the fibre sliver, a card for separating the fibres and a rotor spinning chamber, from which the yarn emerges extracted by a roller and cylinder, to be fed to the winding unit.
  • Said mechanical contact elements which monitor the yarn trajectory below the extraction rollers and are associated with the exit of each spinning unit, are generally in the form of rotatable arms acting as probes which bear on the yarn. If the yarn breaks, the arm rotates downwards to cause stoppage of the spinning unit by means of known contact elements.
  • This mechanical probe formed from an arm element bearing on the travelling yarn can influence said yarn in the sense of modifying its winding tension.
  • mechanical feelers not only is the path of the winding yarn disturbed but the winding yarn tension is increased.
  • the operation of these and similar mechanical yarn monitoring devices is therefore unreliable and unsatisfactory.
  • the object of the invention is therefore to provide a monitoring and control method which does not involve contact with the travelling yarn, and a device for implementing the monitoring procedure which is space-saving, of simple construction, and easy to mount on each rotor spinning unit.
  • the optoelectronic yarn monitor which enables the path of the moving yarn to be monitored and the spinning unit to be stopped at each yarn breakage.
  • the characteristics and principle of operation of the sensing light beam of said optoelectronic yarn monitor are already known in detail in the art.
  • the optoelectronic yarn monitor is in the form of an optical monitor of either single-path, reflection or other known type. In the case of a single-path optical monitor the photoemitter and photoreceiver face each other, whereas in the case of reflection optical monitors the photoemitter and photoreceiver are placed side by side facing a reflector positioned a certain distance away.
  • the purpose therefore of the present invention is to obviate the aforesaid drawbacks by using an optoelectronic monitor positioned above the extraction rollers in each spinning unit to monitor the path of the yarn without any mechanical contact therewith. This monitoring is done by a light beam with the result that even very thin and delicate yarns can be monitored without damage.
  • the optoelectronic device which implements the method of the present invention also has the following advantages: - it is insensitive to machine vibration because it uses a light emitting diode as the light source; - it is insensitive to external light sources because of the use of modulated light for the monitoring light beam; - it is of small dimensions and therefore easily installed on already existing spinning units; - it is insensitive to any variation in the winding tension and to any change in the type of yarn being wound.
  • the winding characteristics can therefore embrace any values; - it is positioned above the extraction unit in a location close to the point of winding.
  • the present invention proposes an optoelectronic device which is insensitive to any tension variation in the yarn being wound.
  • the operation of the device for monitoring the path of the yarn 6 spun by the spinning unit 4 indicated on the accompanying drawing is apparent. In said drawing, those parts not essential for understanding the invention have been omitted for clarity.
  • the yarn 6 is withdrawn at constant speed from the individual spinning unit 4 by the extraction rollers 3 and 5 and is deposited on the surface of the bobbin 16 under formation by the winding unit.
  • the presence of the yarn 6 along its winding path is monitored by the optoelectronic transducer 2, which as a scanning device is constructed advantageously in the shape of a hollow yarn guide to correctly retain the yarn 6 in position.
  • Said optoelectronic transducer 2 is designed to provide at its output electrical signals which are advantageously amplified. Said electrical signals are fed through the cable 8 to the control card 10, they being either of oscillating and hence variable value or of constant value. An oscillating value indicates that the yarn is present whereas a constant value indicates that the yarn is absent (yarn breakage) or has come to rest by virtue of a winding blockage.
  • a yarn moving through an optoelectronic transducer produces an incident light of variable luminosity on the photoreceiver because the yarn diameter slightly oscillates about an average value (count) as is well known, and in addition the yarn vibrates during its travel.
  • the light from the photoemitter encounters the moving yarn and strikes the photoreceiver with variable luminosity, to produce in the optoelectronic transducer associated with the photoreceiver a variation in electrical conditions, so resulting in oscillating electrical signals.
  • These latter reach the control card 10 to confirm that the yarn is moving and being wound, with the result that the card produces no signal for stopping the spinning unit 4.
  • the light from the photoemitter does not encounter yarn (yarn broken) or encounters yarn at rest because the winding is blocked, it strikes the photoreceiver with constant luminosity, to produce constant electrical conditions in the optoelectronic transducer associated with the photoreceiver, and resulting in the generation of electrical signals which are constant with time.
  • Said control card 10 immediately causes stoppage of the spinning unit 4, which then awaits the known rejoining operation to enable the rotor spinning process to be restarted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Quality & Reliability (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP89202172A 1988-09-02 1989-08-28 Verfahren und Vorrichtung zur Überwachung des Spinngarnweges auf einer Open-end-Spinnmaschine Withdrawn EP0357138A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2180988 1988-09-02
IT8821809A IT1226604B (it) 1988-09-02 1988-09-02 Metodo e dispositivo per la sorveglianza della corsa del filo filato in un filatoio a rotore.

Publications (1)

Publication Number Publication Date
EP0357138A1 true EP0357138A1 (de) 1990-03-07

Family

ID=11187153

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89202172A Withdrawn EP0357138A1 (de) 1988-09-02 1989-08-28 Verfahren und Vorrichtung zur Überwachung des Spinngarnweges auf einer Open-end-Spinnmaschine

Country Status (2)

Country Link
EP (1) EP0357138A1 (de)
IT (1) IT1226604B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2168169A1 (es) * 1998-12-23 2002-06-01 Pinter Sa Dispositivo para el control de la continuidad de hilos en maquinas de hilatura y similares.
CN102877171A (zh) * 2012-10-24 2013-01-16 苏州友联纺工装备科技股份有限公司 纱线断线检测装置及纱线断线检测和分级预警系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1283528A (en) * 1968-12-18 1972-07-26 Crabtree Engineering Group Col An improved method and apparatus for detecting yarns
GB2092187A (en) * 1979-09-05 1982-08-11 Shiujia Ohsawa Yarn-break/yarn-stop detecting device
DE3417331A1 (de) * 1983-05-16 1984-11-15 Elitex, koncern textilního strojírenství, Reichenberg/Liberec Verfahren zur automatischen rueckfuehrung von garn und einrichtung zur durchfuehrung des verfahrens
DE3603649A1 (de) * 1986-02-06 1987-08-13 Baer Maschf Josef System zur ueberwachung der fadenzufuehrung bei wickelmaschinen, insbesondere fuer die roving-wickeltechnik

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1283528A (en) * 1968-12-18 1972-07-26 Crabtree Engineering Group Col An improved method and apparatus for detecting yarns
GB2092187A (en) * 1979-09-05 1982-08-11 Shiujia Ohsawa Yarn-break/yarn-stop detecting device
DE3417331A1 (de) * 1983-05-16 1984-11-15 Elitex, koncern textilního strojírenství, Reichenberg/Liberec Verfahren zur automatischen rueckfuehrung von garn und einrichtung zur durchfuehrung des verfahrens
DE3603649A1 (de) * 1986-02-06 1987-08-13 Baer Maschf Josef System zur ueberwachung der fadenzufuehrung bei wickelmaschinen, insbesondere fuer die roving-wickeltechnik

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2168169A1 (es) * 1998-12-23 2002-06-01 Pinter Sa Dispositivo para el control de la continuidad de hilos en maquinas de hilatura y similares.
CN102877171A (zh) * 2012-10-24 2013-01-16 苏州友联纺工装备科技股份有限公司 纱线断线检测装置及纱线断线检测和分级预警系统
CN102877171B (zh) * 2012-10-24 2015-02-04 苏州友联纺工装备科技股份有限公司 纱线断线检测装置及纱线断线检测和分级预警系统

Also Published As

Publication number Publication date
IT1226604B (it) 1991-01-25
IT8821809A0 (it) 1988-09-02

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