EP0375012A2 - Procédé et dispositif pour surveiller le parcours et la qualité de fil en formation dans un continu à filer à anneaux - Google Patents

Procédé et dispositif pour surveiller le parcours et la qualité de fil en formation dans un continu à filer à anneaux Download PDF

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Publication number
EP0375012A2
EP0375012A2 EP89203101A EP89203101A EP0375012A2 EP 0375012 A2 EP0375012 A2 EP 0375012A2 EP 89203101 A EP89203101 A EP 89203101A EP 89203101 A EP89203101 A EP 89203101A EP 0375012 A2 EP0375012 A2 EP 0375012A2
Authority
EP
European Patent Office
Prior art keywords
yarn
under formation
monitoring
ring
guide element
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Withdrawn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
EP89203101A
Other languages
German (de)
English (en)
Other versions
EP0375012A3 (fr
Inventor
Sandro Sartoni
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 EP0375012A2 publication Critical patent/EP0375012A2/fr
Publication of EP0375012A3 publication Critical patent/EP0375012A3/fr
Withdrawn legal-status Critical Current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

Definitions

  • This invention relates to a method and device for continuously monitoring the path of yarn under formation, for its winding onto a package in a ring spinning machine.
  • Ring spinning machines consisting of a plurality of spinning spindles arranged in adjacent progression.
  • Each spinning position comprises a ring-traveller pair, with the rotation of the traveller along the ring providing the real twist to the yarn under formation, and a drafting unit from which a sliver of textile fibres emerges, these being twisted together by the rotation of the spinning spindle as is well known to the expert of the art.
  • the purpose of this monitoring is to generate information, and initiate suitable measures if the yarn has broken or if the yarn which is present is not of the set quantity.
  • Sensors are currently used to a large extent for this purpose, these being of optical, inductive or any other type provided they are able to sense when the rotary travel of the traveller along the ring has stopped, to indicate the breakage of a yarn on a spinning spindle.
  • Said sensors of the known art for sensing yarn breakage are either associated with mechanical units so that they are mobile for sensing purposes along the face or faces of the ring spinning machine, or are of fixed type applied to each spinning position.
  • Yarn monitoring means are however known which are able to determine not only the presence of the yarn but also indicate the quality of the yarn under formation.
  • the known means of this type have further essential drawbacks which perhaps throw doubt on their practical usefulness in that they are of complicated construction while not always being dependable, so that their operation is both unreliable and unsatisfactory.
  • the object of the invention is therefore to provide a control method involving monitoring without contact with the yarn under formation so as not to obstruct the distribution of twist through it, and a device for implementing this monitoring which is space-­saving, of simple construction and easy to mount on any ring spinning spindle.
  • This object is attained according to the invention by providing an optoelectric yarn monitor which enables both the path of the moving yarn under formation to be monitored and the yarn quality to be checked against the set quality, by analyzing the frequency of defects and activating acoustic or light signals either at the spindle or at the head of the machine each time the yarn breaks and each time there is an indication of a defective spindle which is giving rise to an abnormal number of defects.
  • the optoelectric yarn monitor is in the form of an optical monitor of single-path, reflection or other known type.
  • the photoemitter and photoreceiver face each other, whereas in the case of the reflection optical monitor 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 optoelectric monitor positioned at each spinning spindle and above or as a replacement for the first yarn guide after the last pair of drafting rollers, to monitor the path of the yarn and check that its quality confirms to the set quality.
  • This monitoring is done by a light beam with the result that even very thin and delicate yarns can be monitored without damage.
  • the optoelectric 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 operating spinning spindles; - it is positioned above or in the position of the first yarn guide element under the drafting unit.
  • the present invention therefore provides an optoelectric device positioned in an optimum point or section.
  • a further method of the present invention comprises the continuous monitoring of a forming yarn moving towards its collection as a package on a spinning spindle of a ring spinning machine, said continuous monitoring being exercised on the yarn in the position of the first yarn guide element below the last pair of drafting rollers by an optoelectric transducer which acts as and replaces said yarn guide element.
  • 8 is the drafting roller pair positioned at the end of the drafting unit from which a sliver of textile fibres leaves to be twisted to form the yarn; 3 is the yarn under formation, which acquires twist by the rotation of the traveller 6; 4 is the first yarn guide below the drafting roller pair 8, it being in the form of a loop to facilitate the introduction of the yarn 3.
  • Said yarn guide 4 represents the vertex of the balloon 12.
  • the shape of the balloon 12 is determined by the centrifugal force of the yarn between the yarn guide 4 and the traveller 6, as is well known to the expert of the art.
  • the yarn 3 under formation travels downwards within the loop of the yarn guide 4 with negligible transverse oscillation;
  • 5 is the support for the yarn guide 4 and can be tilted to facilitate doffing, and in addition is adjustable;
  • 2 is the photoelectric or capacitive or piezoelectric transducer for monitoring the moving yarn 3 under formation, said photoelectric transducer 2 being positioned between the drafting roller pair 8 and the yarn guide element 4.
  • said photoelectric transducer 2 is positioned in proximity to the yarn guide 4, or replaces said yarn guide 4;
  • 14 is the package under formation;
  • 9 is the ring support bench which is moved with vertical reciprocating movement to wind the yarn in superposed concentric layers to form the known spinning package 14;
  • 6 is the traveller rotated by the rotational speed of the spindles, the revolutions of said traveller 6 creating the real twist acquired by the yarn 3 under formation;
  • 7 is the ring which is fixed on the bench 9 to form the guide and rotation track for the traveller 6;
  • 15 is the wound yarn support tube for forming the package 14;
  • 10 is the antiballoon yarn guide or balloon control ring, with its aperture curved to allow and facilitate introduction of the yarn;
  • 11 is the support for the ring 10, and can be raised and tilted for doffing purposes, and is also adjustable.
  • the textile fibre sliver leaves the pair of drafting rollers 8 at constant speed. Twist rises from the traveller 6 to bind the textile fibres together in cylindrical form to form the yarn 3, which travels downwards and continues to assume twist, to then deposit on the surface of the forming package 14 by the action of the ring-traveller pair.
  • the optoelectric transducer 2 which, as a device for investigating presence and quality, is constructed advantageously in the form of a hollow yarn guide so as to correctly retain the yarn 3 in position.
  • Said optoelectric transducer 2 is designed to provide at its output electrical signals which are advantageously amplified.
  • Said electrical signals are fed through the cable 18 to the control card 16, they being either of oscillating and hence variable value or of constant value.
  • An oscillating value indicates that the yarn 3 is being collected whereas a constant value indicates that the yarn is absent (accidental yarn breakage).
  • a yarn moving through an optoelectric transducer produces an incident light of variable luminosity on the photoreceiver because, as is well known, the diameter of the forming yarn 3 slightly oscillates about an average value (count), and in addition the yarn vibrates slightly during its travel.
  • the light from the photoemitter encounters the moving yarn and strikes the photoreceiver with variable luminosity to produce a variation in electrical conditions in the optoelectric transducer, so resulting in oscillating electrical signals.
  • These latter reach the control card 16 to confirm that the forming yarn 3 is under movement and that the linear regularity of the yarn 3 is within a predetermined range, with the result that said card 16 does not produce a signal at the spinning spindle or in any other advantageous position.
  • the control card 16 which immediately produces signals at the spinning spindle, or feeds them to the head of the machine so as to call the attention of the service personnel, who are thus made aware of the breakage of the yarn 3 or of the linear irregularity defects in the yarn 3 being wound on the forming package 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP19890203101 1988-12-23 1989-12-07 Procédé et dispositif pour surveiller le parcours et la qualité de fil en formation dans un continu à filer à anneaux Withdrawn EP0375012A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2308788 1988-12-23
IT8823087A IT1227727B (it) 1988-12-23 1988-12-23 Metodo e dispositivo per la sorveglianza della corsa e della qualita' del filo in formazione in un filatoio ad anelli

Publications (2)

Publication Number Publication Date
EP0375012A2 true EP0375012A2 (fr) 1990-06-27
EP0375012A3 EP0375012A3 (fr) 1991-01-02

Family

ID=11203641

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890203101 Withdrawn EP0375012A3 (fr) 1988-12-23 1989-12-07 Procédé et dispositif pour surveiller le parcours et la qualité de fil en formation dans un continu à filer à anneaux

Country Status (2)

Country Link
EP (1) EP0375012A3 (fr)
IT (1) IT1227727B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2154549A1 (es) * 1998-05-20 2001-04-01 Pinter Sa Dispositivo para la deteccion de roturas de hilos en maquinas continuas de hilar.
EP3293295A1 (fr) * 2016-09-13 2018-03-14 Premier Evolvics PVT. Ltd. Système de mesure pour une machine traitant une matière textile en forme de ruban continu

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2337772A1 (fr) * 1976-01-09 1977-08-05 Lanerossi Spa Procede et appareil pour detecter automatiquement la presence ou l'absence de fils dans des metiers a filer
GB2023671A (en) * 1978-05-16 1980-01-03 Kitamura S Detecting yarn breaks in spinning machines
DE3704248A1 (de) * 1986-02-11 1987-08-27 Forschungsanwendungsgesellscha Einrichtung zur ueberwachung von zwischen zwei bauteilen gefuehrten faeden oder draehten

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2337772A1 (fr) * 1976-01-09 1977-08-05 Lanerossi Spa Procede et appareil pour detecter automatiquement la presence ou l'absence de fils dans des metiers a filer
GB2023671A (en) * 1978-05-16 1980-01-03 Kitamura S Detecting yarn breaks in spinning machines
DE3704248A1 (de) * 1986-02-11 1987-08-27 Forschungsanwendungsgesellscha Einrichtung zur ueberwachung von zwischen zwei bauteilen gefuehrten faeden oder draehten

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2154549A1 (es) * 1998-05-20 2001-04-01 Pinter Sa Dispositivo para la deteccion de roturas de hilos en maquinas continuas de hilar.
EP3293295A1 (fr) * 2016-09-13 2018-03-14 Premier Evolvics PVT. Ltd. Système de mesure pour une machine traitant une matière textile en forme de ruban continu

Also Published As

Publication number Publication date
IT1227727B (it) 1991-05-06
IT8823087A0 (it) 1988-12-23
EP0375012A3 (fr) 1991-01-02

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