EP0131385A1 - Dispositif d'ouvraison pour machine de filature à fibres libérées - Google Patents

Dispositif d'ouvraison pour machine de filature à fibres libérées Download PDF

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Publication number
EP0131385A1
EP0131385A1 EP84303887A EP84303887A EP0131385A1 EP 0131385 A1 EP0131385 A1 EP 0131385A1 EP 84303887 A EP84303887 A EP 84303887A EP 84303887 A EP84303887 A EP 84303887A EP 0131385 A1 EP0131385 A1 EP 0131385A1
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EP
European Patent Office
Prior art keywords
sliver
drafting
fibre
opening unit
beater roll
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Withdrawn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
EP84303887A
Other languages
German (de)
English (en)
Inventor
Alan Parker
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.)
Hollingsworth UK Ltd
Original Assignee
Hollingsworth UK Ltd
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
Priority claimed from GB838316342A external-priority patent/GB8316342D0/en
Application filed by Hollingsworth UK Ltd filed Critical Hollingsworth UK Ltd
Publication of EP0131385A1 publication Critical patent/EP0131385A1/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Withdrawn legal-status Critical Current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
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/30—Arrangements for separating slivers into fibres; Orienting or straightening fibres, e.g. using guide-rolls
    • D01H4/32—Arrangements for separating slivers into fibres; Orienting or straightening fibres, e.g. using guide-rolls using opening rollers

Definitions

  • the present invention provides an improvement in open-end spinning, and in one aspect relates to a fibre opening unit for open-end spinning. Another aspect of the invention relates to a process of open-end spinning.
  • open-end spinning There are various forms of open-end spinning known to date, the two principal ones of which are rotor spinning such as is disclosed in our British Patent Specification No. 1,191,668, and friction spinning such as is disclosed in our Published British Patent Application No. 2,042,599A.
  • Other forms of open-end spinning include fluid jet spinning and electrostatic spinning.
  • Open-end spinning systems have in common the fact that an incoming sliver is broken down into its constituent fibres which are then conveyed, usually by fluid entrainment, to a reconstitution zone where the fibres are twisted together to form a yarn.
  • the diameter of the delivered yarn is much smaller than that of the incident sliver, and thus the open-end spinning unit can be considered analogous to a drafting system in that the fibrous material undergoes a considerable draft between arrival of the sliver and departure of the spun yarn.
  • One aspect of the present invention provides an open-end spinning process comprising taking a sliver, subjecting it to a pre-drafting operation, presenting the pre-drafted sliver to the sliver guide means of a fibre-opening unit, separating the fibres from the sliver by the action of the beater roll, and re-constituting the thus withdrawn fibres to form a yarn, characterised in that the final drafting pair of the pre-drafting means is directly adjacent the feed nip to the beater roll and serves to guide the sliver directly into the feed nip such that the fibres of the pre-drafted sliver are applied at a predetermined location along the axis of the beater roll.
  • Open-end spinning has used a drafted sliver as feed material and is itself analogous to drafting means, but nevertheless we believe it is a most surprising step to incorporate a conventional drafting operation in the fibre supply means constituted by the fibre-opening unit.
  • a second aspect of the present invention provides a fibre-opening unit for open-end spinning, comprising a toothed or pinned beater roll, a feed nip for presenting sliver to the beater roll, and pre-drafting means for the sliver fed to the feed nip, characterised in that the pre-drafting means has its final drafting pair directly adjacent the sliver feed nip to the beater roll to control the positioning of the sliver axially along the beater roll.
  • the invention also provides an open-end spinning unit including the fibre-opening unit of the second aspect.
  • sliver is prepared for spinning by being drawn in a drawing frame where various slivers are themselves doubled together and stretched to effect blending and straightening of the fibres.
  • the sliver is coiled in storage cans and the individual cans are then subsequently transported to spinning heads where the coiled sliver is unpacked and fed to the fibre-opening unit to allow the individual fibres to be extracted from the sliver and fed to the reconstitution zone.
  • a friction spinning head as the open-end spinning head in question, but it will of course be appreciated that the open-end spinning head could be of any type,i.e.a spinning head in which the individual fibres of the sliver are subsequently reconstituted to form a yarn.
  • the sliver is introduced to the fibre-opening unit 1 by way of a sliver feed guide 2 which directs the sliver into the nip between a first pair of drafting rolls comprising a driven drafting roll 3 and an idler drafting roll 4 which is spring-biased towards the driven roll 3.
  • the peripheral velocity of the rolls 3 and 4 will be the same, by virtue of their frictional contact with the sliver and will be less than the peripheral velocity of a second pair of drafting rolls comprising a driven drafting roll 5 and an idler drafting roll 6, again spring-biased towards the driven roll for frictional drive.
  • a fibre-opening unit of a known kind of the form generally illustrated in British Patent Specification No. 1368886.
  • a fibre-opening unit includes a feed pedal 7, pressing the sliver against a ribbed sliver feed roll 8, and thereby guiding it onto a toothed or pinned beater roll or opener roll 9.
  • trash extraction means are provided around the periphery of the beater roll 9 and a fibre discharge opening of the beater housing will convey the airborne fibres into the fibre feed duct of a friction spinning machine which may be generally of the kind disclosed in our said Published British Patent Application No. 2,042,599A.
  • the two driven drafting rolls 3 and 5 are drivingly interconnected by a common timing belt 10 with the necessary peripheral velocity ratio between the drafting rolls being achieved by way of having on the first driven drafting roll a toothed pulley 3a which is smaller in diameter than the drafting roll 3 itself, and on the second driven drafting roll a toothed pulley 5a which is larger than the drafting roll 5 itself.
  • toothed pulleys 3a and 5a are replaceable, and the apparatus will be supplied with a selection of toothed pulleys of different sizes which allow the timing belt to span each of the pulleys.
  • the toothed pulley 5a may be one having ten teeth or one having fourteen teeth
  • the toothed pulley 3 a may be one having thirty teeth, twentyfour teeth or twelve teeth, the tooth pitch being the same in each case.
  • the sliver feed roll 8 in this case has its own toothed pulley 8a( Figure 2) driven from a secondary toothed pulley 5b connected to the second driven drafting roll 5.
  • a further timing belt 1 2 connects the pulleys 5b and 8a.
  • Drive to the fibre-opening unit is thus in this case by way of drive input to the shaft of the second driven drafting roll 5.
  • pre-draft in excess of 1.1:1 and up to 30:1. This preferred range embraces the values 1.2:1,1.7:1,2.4:1,and 3:1 mentioned above.
  • the effective draft of the open-end spinning unit is multiplied by the pre-draft value to give the total effective draft.
  • the pre-draft value for a friction spinning head with an effective draft of 120:1 (between the sliver at the sliver feed roll 8 and the yarn at the withdrawal rolls (not shown) of the spinning head) and with the . upper pre-draft value of 3:1 (with a pulley 3a of thirty teeth and a pulley 5a of ten teeth) there will be an overall effective draft of 360:1.
  • a ring frame spinning process (which is not open-end spinning) has a draft of only 40:1.
  • a first important advantage of having pre-draft at the beater unit is that the delivery of drafted sliver from the second drafting rolls 5 and 6 to the guide means of the fibre-opening unit (in this case the feed pedal 7 and the sliver feed roll 8) is always in exactly the same position along the axis of the beater 9 (and in this case along the parallel axis of the sliver feed roll 8).
  • the stream of discrete fibres delivered from the beater 9 is always accurately positioned in relation to the axis of the beater 9. This is particularly important in the case of a friction spinning machine such as that disclosed in our said Published U.K. Patent Application No.
  • Another important advantage of the pre-draft of the fibres is that this operation gives more accurate orientation of the fibres parallel to the direction of advance of the sliver; and consequently parallel to a plane which is perpendicular to the axis of rotation of the beater 9.
  • the fibres leaving the beater 9 are more likely to be parallel to the general longitudinal axis of the fibre feed duct carrying them in airborne form towards the yarn formation throat between the friction spinning rollers. It will be understood that this latter advantage is also important in the case of rotor spinning Where the parallelism of the fibres helps to give a generally stronger yarn.
  • the individual fibres in a drafted sliver which has just been withdrawn from a coiled build-up in a storage can will be parallel to one another at any one point along the yarn, but with time the orientation of the fibres arriving at the beater roll will vary due to the influence.of the coiling and uncoiling action on the sliver.
  • pre-draft just as the sliver approaches the sliver feed rolJa: or equivalent guide means it will be ensured that the fibres are also at a constant orientation i.e. parallel to the direction of sliver advance, and preferably also parallel with respect to the path of movement of the teeth or pins of the beater roll.
  • a further advantage of having pre-draft is that the incoming sliver can be more bulky than would otherwise be tolerated, and the fact that the pre-draft is adjustable makes it possible for sliver from various different sources to be equally well spun on a particular open-end spinning machine.
  • the sliver presented to the beater is absolutely uniform in that it has just been drawn before presentation to the guide means to the beater (in this case the feed pedal 7 and the sliver feed roller 8) and, despite any residual signs of its having previously been coiled in the storage cans in which it has been confined after the drawing frame process, the drafted sliver presented to the beater is absolutely straight and free of kinks.
  • the axes of the drafting rolls 3, 4, 5, 6 are parallel to the axes of the sliver feed roller 8 and beater roll 9.
  • the drafting rolls 5, 6, while being parallel to one another may be skew to the axes of the sliver feed roller 8 and beater roll 9 but such that the direction of movement of the surfaces of the final drafting rolls at the nip between them is directly towards the passage between the feed pedal 7 and sliver feed rollers 8.
  • the axes of rolls 5, 6 may even be perpendicular to that of beater roll 9.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP84303887A 1983-06-15 1984-06-07 Dispositif d'ouvraison pour machine de filature à fibres libérées Withdrawn EP0131385A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8316342 1983-06-15
GB838316342A GB8316342D0 (en) 1983-06-15 1983-06-15 Open-end spinning
GB8318052 1983-07-04
GB838318052A GB8318052D0 (en) 1983-06-15 1983-07-04 Open-end spinning

Publications (1)

Publication Number Publication Date
EP0131385A1 true EP0131385A1 (fr) 1985-01-16

Family

ID=26286376

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84303887A Withdrawn EP0131385A1 (fr) 1983-06-15 1984-06-07 Dispositif d'ouvraison pour machine de filature à fibres libérées

Country Status (1)

Country Link
EP (1) EP0131385A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1941084A1 (de) * 1968-08-16 1970-02-19 Tmm Research Ltd Verfahren und Vorrichtung zum openend-Spinnen von Textilgarnen
DE2036007A1 (en) * 1970-07-21 1972-01-27 Wilhelm, Stahlecker GmbH, 7341 Reichenbach Open-end spinning feed unit - with sliver drafting
DE2115484A1 (en) * 1971-03-31 1972-10-12 Wilhelm Stahlecker Gmbh, 7341 Reichenbach Loosening roller brake - in open-end spinning unit to clamp roller on opening the housing
GB1326200A (en) * 1971-01-12 1973-08-22 Tmm Research Ltd Methods of and apparatus for the open-end spinning of fibrous material
FR2298626A1 (fr) * 1975-01-23 1976-08-20 Fehrer Ernst Dispositif d'alimentation pour groupe d'ouverture de fibres place en amont d'un poste de filage
US4067181A (en) * 1975-01-23 1978-01-10 Ernst Fehrer Fiber-disintegrating unit for a spinning machine
GB1580427A (en) * 1976-01-26 1980-12-03 Mackie & Sons Ltd J Spinning machines

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1941084A1 (de) * 1968-08-16 1970-02-19 Tmm Research Ltd Verfahren und Vorrichtung zum openend-Spinnen von Textilgarnen
DE2036007A1 (en) * 1970-07-21 1972-01-27 Wilhelm, Stahlecker GmbH, 7341 Reichenbach Open-end spinning feed unit - with sliver drafting
GB1326200A (en) * 1971-01-12 1973-08-22 Tmm Research Ltd Methods of and apparatus for the open-end spinning of fibrous material
DE2115484A1 (en) * 1971-03-31 1972-10-12 Wilhelm Stahlecker Gmbh, 7341 Reichenbach Loosening roller brake - in open-end spinning unit to clamp roller on opening the housing
FR2298626A1 (fr) * 1975-01-23 1976-08-20 Fehrer Ernst Dispositif d'alimentation pour groupe d'ouverture de fibres place en amont d'un poste de filage
US4067181A (en) * 1975-01-23 1978-01-10 Ernst Fehrer Fiber-disintegrating unit for a spinning machine
GB1580427A (en) * 1976-01-26 1980-12-03 Mackie & Sons Ltd J Spinning machines

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Inventor name: PARKER, ALAN