EP0458078A1 - Verfahren und Vorrichtung zum Reissen von Faserband in Spinnmaschinen - Google Patents

Verfahren und Vorrichtung zum Reissen von Faserband in Spinnmaschinen Download PDF

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Publication number
EP0458078A1
EP0458078A1 EP91106652A EP91106652A EP0458078A1 EP 0458078 A1 EP0458078 A1 EP 0458078A1 EP 91106652 A EP91106652 A EP 91106652A EP 91106652 A EP91106652 A EP 91106652A EP 0458078 A1 EP0458078 A1 EP 0458078A1
Authority
EP
European Patent Office
Prior art keywords
roving
tearing
roller
unit
yarn
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Withdrawn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
EP91106652A
Other languages
English (en)
French (fr)
Inventor
Mirko Marchiori
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.)
S BIGAGLI AND C SpA
Original Assignee
S BIGAGLI AND C 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 S BIGAGLI AND C SpA filed Critical S BIGAGLI AND C SpA
Publication of EP0458078A1 publication Critical patent/EP0458078A1/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Withdrawn legal-status Critical Current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
    • D01H13/18—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 stopping supply only
    • D01H13/188—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 stopping supply only by cutting or clamping yarns or rovings
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H15/00—Piecing arrangements ; Automatic end-finding, e.g. by suction and reverse package rotation; Devices for temporarily storing yarn during piecing

Definitions

  • This invention concerns a method and device to tear roving in spinning machines.
  • the invention concerns a method and device suitable to break the continuity of the roving leaving the drafting unit at the moment when the yarn is pieced up after being broken, the piecing-up taking place on one single spinning unit while the spinning machine is working.
  • the invention is applied to textile materials of any type which possess properties such as will ensure cohesion of the roving leaving the drafting unit and aspirated by the aspiration device.
  • the roving does not break, or its breakage is not achieved with the required speed and synchronization mentioned above.
  • the roving is fed continuously from the drafting unit, and therefore a sideways displacement, for instance, of the roving leaving the drafting unit so as to cause its breakage has a scanty effect.
  • the present applicant has studied, tested and provided a method and relative device suitable to overcome all the problems of the state of the art.
  • the invention provides for the breakage or tearing of the roving to be achieved by a drawing action exerted between the outlet of the drafting unit and the inlet of the aspiration intake.
  • each spinning unit to be equipped with an additional drawing unit positioned at the aspiration intake.
  • the additional drawing unit consists advantageously of a powered tearing roller and a pressure roller which cooperates momentarily with the tearing roller.
  • the peripheral speed of the tearing roller can be regulated and is normally kept much higher than the speed of the drafting roller of the drafting unit so as to achieve breakage of the roving in a very short time.
  • the breakage occurs in a short period of time after contact of the pressure roller with the tearing roller.
  • the additional drawing unit is positioned advantageously behind the path of the yarn on the spinning unit, that is to say, the additional drawing unit is placed towards the inside of the spinning machine. In this way it does not hinder the machine operator performing the piecing-up.
  • the method and device of the invention accomplish a plurality of advantages. Among these advantages, it should be borne in mind, is the fact that the segment of roving to be broken is held firmly between two nip points, namely the outlet of the drafting unit and inlet of the tearing roller, and therefore there is no possibility of a withdrawal and departure of the segment of roving from the aspiration intake.
  • the existence of the two nip points ensures breakage of the roving even where very strong materials are in question such as, for instance, roving containing long manmade fibres, since very strong forces can be applied to the roving.
  • the portion of roving located downstream of the breakage point is accompanied by the additional tearing unit towards the inlet of the aspiration intake, thereby enhancing the distancing and discharge of the fibres of the torn roving.
  • a part of a spinning machine is referenced with 10 in Fig.1 and includes two spinning positions or spinning units at a zone of output of a drafting unit 11.
  • An intake 15 to aspirate roving 12 normally cooperates with the roving 12 leaving the last drafting assembly of the drafting unit 11, this assembly consisting of a drafting roller 13 and relative pressure roller 14.
  • the intake 15 has the task of aspirating and retaining the roving 12 when a spinning breakage takes place.
  • a device 16 to tear the roving 12 is provided between the exit from the drafting unit 11 and the entry to the twisting-winding means (for instance, the spindle of a ring spinning machine, which is not shown in the figures) of the spinning machine in correspondence with the zone of activity of the roving aspiration intake 15.
  • the twisting-winding means for instance, the spindle of a ring spinning machine, which is not shown in the figures
  • the tearing device 16 consists of a drawing unit formed by a tearing roller 17 and a relative pressure roller 18.
  • the pressure roller 18, which is equipped with a resilient coating, is solidly fixed to a resilient plate 19 secured to the structure of the spinning machine, whereas the tearing roller 17, which too is secured to the structure of the spinning machine, is suitably powered.
  • two pressure rollers 18 are solidly fixed to each resilient plate 19 and act at the same time on two adjacent spinning positions when the respective resilient plate 19 is thrust downwards.
  • This embodiment offers the advantage of ensuring a good support of the pressure rollers 18 on the relative tearing rollers 17, thereby achieving an efficient gripping of the roving 12 and a simplified structure of the drawing unit 16.
  • the tearing roller 17 extends advantageously along the whole side of the spinning machine and may include in correspondence with the pressure rollers 18 a knurled area, referenced with 17 in the figures, so as to enhance the gripping of the roving 12.
  • the tearing roller 17 When the spinning machine is working, the tearing roller 17 is kept in continual rotation, and its speed of rotation can be regulated by a suitable control system and be varied in relation to the speed of output of roving 12 by the drafting unit 11.
  • the pressure rollers 18 in their inactive position are separated from the tearing roller 17 and are halted.
  • the tearing roller 17 and pressure roller 18 are located behind the path of the yarn 20 towards the interior of the spinning machine. The purpose of this is to make possible the piecing-up, which requires the end of the yarn 20 coming from the yarn package to be brought to the drafting roller 13 solidly fixed to the drafting unit 11.
  • the tearing roller 17 is positioned in correspondence with the aspiration intake 15 and immediately thereunder; the pressure roller 18 in its inactive position is always in the neighbourhood of the aspiration intake 15 but is immediately thereabove.
  • the roving 12 is aspirated by the intake 15 and is positioned between the tearing roller 17 and pressure roller 18; in this way it is already ready to be torn by the device 16.
  • Fig.1 shows the position of the roving tearing device 16 during a normal spinning step
  • Fig.2 shows a spinning unit after breakage of the yarn, the roving 12 having been aspirated by the intake 15 while the tearing device 16 is still in its inactive position.
  • Fig.3 shows an operational step in which the machine operator positions with one hand the end of the yarn 20 to be pieced up in correspondence with the drafting unit 13-14 and prepares to actuate the tearing device 16 with his other hand.
  • Fig.4 shows the final step of the piecing-up, in which the end of the yarn 20 has been inserted under the pressure roller 14 of the drafting unit 11 and piecing-up has taken place, while the segment of roving 12 has been torn by the pressure roller 18 being brought down into contact with the tearing roller 17.
  • the resilient plate 19 is positioned advantageously at the space between two neighbouring spinning units, thereby keeping the space occupied by the device 16 to a minimum and making easy the operation of the device by the operator.
  • the tearing can also be obtained by means of two small pressure rollers of which one is powered or driven.
  • a variant is also possible in which the tearing roller 17 is coated with a resilient material, while the pressure rollers 18 have knurled surfaces.
  • the tearing roller 17 may not extend along the whole spinning machine but may, for instance, be single or in a powered pair; it can also be arranged that the tearing roller or rollers is/are normally halted and only actuated by the operator during a piecing-up step.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Paper (AREA)
EP91106652A 1990-05-22 1991-04-25 Verfahren und Vorrichtung zum Reissen von Faserband in Spinnmaschinen Withdrawn EP0458078A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8338890 1990-05-22
IT83388A IT1240889B (it) 1990-05-22 1990-05-22 Procedimento e dispositivo di strappo stoppino in macchine di filatura

Publications (1)

Publication Number Publication Date
EP0458078A1 true EP0458078A1 (de) 1991-11-27

Family

ID=11321143

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91106652A Withdrawn EP0458078A1 (de) 1990-05-22 1991-04-25 Verfahren und Vorrichtung zum Reissen von Faserband in Spinnmaschinen

Country Status (2)

Country Link
EP (1) EP0458078A1 (de)
IT (1) IT1240889B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104695071A (zh) * 2015-02-28 2015-06-10 南通华强布业有限公司 一种负压式紧密纺搭头方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3208683A1 (de) * 1982-03-10 1983-09-22 Zinser Textilmaschinen Gmbh, 7333 Ebersbach Fadenansetzvorrichtung
DE8706269U1 (de) * 1987-04-30 1987-06-25 Zinser Textilmaschinen Gmbh, 73061 Ebersbach Luntenstop-Vorrichtung am Streckwerk einer Spinnmaschine
DE3730373A1 (de) * 1987-09-10 1989-03-23 Zinser Textilmaschinen Gmbh Verfahren zum automatischen beheben eines fadenbruches an einer spinnstelle einer ringspinnmaschine und ringspinnmaschine
EP0322636A1 (de) * 1987-12-24 1989-07-05 Maschinenfabrik Rieter Ag Stoppvorrichtung für ein Faserband an einer Textilmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3208683A1 (de) * 1982-03-10 1983-09-22 Zinser Textilmaschinen Gmbh, 7333 Ebersbach Fadenansetzvorrichtung
DE8706269U1 (de) * 1987-04-30 1987-06-25 Zinser Textilmaschinen Gmbh, 73061 Ebersbach Luntenstop-Vorrichtung am Streckwerk einer Spinnmaschine
DE3730373A1 (de) * 1987-09-10 1989-03-23 Zinser Textilmaschinen Gmbh Verfahren zum automatischen beheben eines fadenbruches an einer spinnstelle einer ringspinnmaschine und ringspinnmaschine
EP0322636A1 (de) * 1987-12-24 1989-07-05 Maschinenfabrik Rieter Ag Stoppvorrichtung für ein Faserband an einer Textilmaschine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104695071A (zh) * 2015-02-28 2015-06-10 南通华强布业有限公司 一种负压式紧密纺搭头方法

Also Published As

Publication number Publication date
IT9083388A0 (it) 1990-05-22
IT9083388A1 (it) 1991-11-22
IT1240889B (it) 1993-12-17

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