EP0340864A1 - Process for depositing a reserve of yarn on a winding tube - Google Patents

Process for depositing a reserve of yarn on a winding tube Download PDF

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Publication number
EP0340864A1
EP0340864A1 EP89201112A EP89201112A EP0340864A1 EP 0340864 A1 EP0340864 A1 EP 0340864A1 EP 89201112 A EP89201112 A EP 89201112A EP 89201112 A EP89201112 A EP 89201112A EP 0340864 A1 EP0340864 A1 EP 0340864A1
Authority
EP
European Patent Office
Prior art keywords
yarn
reserve
tube
turns
spinning
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.)
Ceased
Application number
EP89201112A
Other languages
German (de)
English (en)
French (fr)
Inventor
Donato Castellarin
Sergio Montali
Luigi Colli
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 EP0340864A1 publication Critical patent/EP0340864A1/en
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H54/00—Winding, coiling, or depositing filamentary material
    • B65H54/02—Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
    • B65H54/28—Traversing devices; Package-shaping arrangements
    • B65H54/34—Traversing devices; Package-shaping arrangements for laying subsidiary winding, e.g. transfer tails
    • B65H54/343—Traversing devices; Package-shaping arrangements for laying subsidiary winding, e.g. transfer tails when starting winding on an empty bobbin
    • 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

  • the present invention relates to a process for depositing a multi-turn reserve of yarn of a tube without wound yarn in a rotor winding unit during the cycle of full-bobbin doffing.
  • the present invention makes it possible the reserve turns to be given a high enough tension and them to be given, in their geometric arrangement of deposition, that bond cohesion and mutual penetration, which secures a difficultly loosenable and unwindable compactness.
  • the tension of the yarn plays an important role in the formation of the reserve windings.
  • a too low tension can originate an unstable fine string-like reserve, which will tend to loosen, originating the so-said " fallen turns” with dangling yarn lengths which, in their turn, cause entanglements of yarns belonging to different bobbins conveyed by a same conveyor belt, or to a same storage.
  • the yarns dangling from the bobbins furthermore originate undesired deposits around the various members of the belt conveyors, or around similar elements, often hindering, and, in extreme cases, either blocking the same conveyor units.
  • the reserve windings which collapse cause therefore disorders in the conveyances and entanglements of yarns in the storages of the cheeses, of wound yarn units, and cause as well difficulties in the downstream operations when the reserve length is absent, or is broken, or is pulled away (on the creel, the units of wound yarn, i.e., the cheeses, are jointed to each other by using the yarn length obtained from the unwinding of the reserve turns).
  • a wound yarn unit must be capable of maintaining the reserve turns wound around the tube even after a considerable amount of handling, making it possible the yarn to be quickly unwound in all of the subsequent operations, which contemplate the redrawing of the yarn.
  • Said wound yarn unit can be of any geometrical shapes, and in the present specification, and in the appended claims, it will be simply denominated as “bobbin” or “cheese”, with both above terms being used interchangeably.
  • the causes of an insufficiently high tensioning derive from the difference between the revolution speed of the extraction roll, which reaches nearly instantaneously its steady-state value, and the speed of yarn collection, which has a less steep acceleration slope.
  • the pressure roller-extraction roll couple is preset at a revolution speed which is related to a helical winding mode, i.e., with a deposition speed which is the sum of the revolution speed and of the translational speed imposed by the yarn-guide element.
  • the speed of deposition of the reserve turns, which are arranged on the tube is a nearly circumferential pattern, is approximately equal to the revolution speed, and is therefore considerably lower than said deposition speed with helical turns.
  • a further advantage of the herein disclosed device, as compared to the prior art, is its extreme structural simpleness, from which operating steps endowed with a considerably high reliability derive.
  • the device for practicing the above said process comprises a pressure roller-lifting unit, which is activated for the necessary time for the reserve to be formed, and is associated, as a single body, with a sliding unit.
  • the device used for practicing the present invention, is furthermore associated with scheduler means for coordinating the sequence of activation of the various operating elements.
  • Said slider unit is made mobile along the spinning front(s) by means of running ways comprising one or more rails, of any shapes, cooperating with suitable rolling means such as wheels, or rollers, or equivalent means.
  • the slider unit is continuously driven in front of the line of the spinning units, reciprocating in order to perform its patrolling function. Whenever on one of the spinning units 8 the yarn reaches the pre-established length to be collected on the tube 22, said spinning unit stops and emits a signal by means of photo-cells.
  • the slider unit when running before the spinning unit, stops as well, and a member provided on the slider unit hooks the bobbin-carrier frame 21, opening the reception elements 20.
  • the bobbin, full of wound yarn, is conveyed to the discharge conveyor belt.
  • the tube-taking device takes a tube without wound yarn from the tube distributor, and consigns it to the unit which will force the tube on the bobbin-carrier frame 21.
  • the yarn 11 is extracted from the spinning rotor 8, by being supplied with the necessary tension for it to leave the spinning unit by means of the revolutionary motion supplied to the tube 22 by the tube-­drive roll 27.
  • the arm 15, reversing its reciprocating direction guides the yarn 11 collecting it on the tube 22 as an upper wide turn, which furthermore ties the whole of the underlying reserve turns, while the arm lever 10 rotates, according to the arrow 19, disengaging its end from the yarn 11, in order to leave it free to be engaged by the yarn-guide unit 24 which, during its continuous reciprocating motion, starts forming the bobbin.
  • Tests carried out by the present Applicant demonstrated the perfect repeatibility and the extremely high reliability of the above disclosed process, as developed and disclosed in the present invention, for depositing a compact, fine string-like reserve of yarn, which is difficult to be loosened and unwound.
  • the advantage of the herein proposed process is that the deposition of the turns in order to form the reserve of yarn taks place always in the presence of the necessary tension for causing the yarn to exit the spinning unit.
  • reserve turns may be wound according to more or less loose turns.

Landscapes

  • Replacing, Conveying, And Pick-Finding For Filamentary Materials (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP89201112A 1988-05-06 1989-05-01 Process for depositing a reserve of yarn on a winding tube Ceased EP0340864A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2049888 1988-05-06
IT20498/88A IT1218238B (it) 1988-05-06 1988-05-06 Procedimento per depositare una riserva di filo su un tubetto di avvolgimento

Publications (1)

Publication Number Publication Date
EP0340864A1 true EP0340864A1 (en) 1989-11-08

Family

ID=11167843

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89201112A Ceased EP0340864A1 (en) 1988-05-06 1989-05-01 Process for depositing a reserve of yarn on a winding tube

Country Status (2)

Country Link
EP (1) EP0340864A1 (it)
IT (1) IT1218238B (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005045814A1 (de) * 2005-09-24 2007-04-05 Saurer Gmbh & Co. Kg Serviceaggregat für eine Kreuzspulen herstellende Textilmaschine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0149107A2 (de) * 1983-12-09 1985-07-24 Schubert & Salzer Maschinenfabrik Aktiengesellschaft Verfahren zum Bilden einer Fadenreservewicklung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0149107A2 (de) * 1983-12-09 1985-07-24 Schubert & Salzer Maschinenfabrik Aktiengesellschaft Verfahren zum Bilden einer Fadenreservewicklung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005045814A1 (de) * 2005-09-24 2007-04-05 Saurer Gmbh & Co. Kg Serviceaggregat für eine Kreuzspulen herstellende Textilmaschine

Also Published As

Publication number Publication date
IT1218238B (it) 1990-04-12
IT8820498A0 (it) 1988-05-06

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