EP0295731B1 - Twisting device for giving a false twisting to a textile fibre sliver - Google Patents

Twisting device for giving a false twisting to a textile fibre sliver Download PDF

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Publication number
EP0295731B1
EP0295731B1 EP88200983A EP88200983A EP0295731B1 EP 0295731 B1 EP0295731 B1 EP 0295731B1 EP 88200983 A EP88200983 A EP 88200983A EP 88200983 A EP88200983 A EP 88200983A EP 0295731 B1 EP0295731 B1 EP 0295731B1
Authority
EP
European Patent Office
Prior art keywords
sliver
spiral element
bobbin
winding
false twisting
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.)
Expired - Lifetime
Application number
EP88200983A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0295731A1 (en
Inventor
Sandro Sartoni
Eraldo Minguzzi
Gottardo Patuelli
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 EP0295731A1 publication Critical patent/EP0295731A1/en
Application granted granted Critical
Publication of EP0295731B1 publication Critical patent/EP0295731B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D01H7/00—Spinning or twisting arrangements
    • D01H7/92—Spinning or twisting arrangements for imparting transient twist, i.e. false twist
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/005—Means compensating the yarn tension in relation with its moving due to traversing arrangements
    • 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
    • B65H2701/311—Slivers

Definitions

  • the present invention relates to a twisting device for giving a false twist to a textile fibre sliver between the outlet calender of a drawing frame and a winding unit having a bobbin winding carriage, which is reciprocating parallel to the axis of the bobbin being formed and which supports an active false twisting unit with a revolving funnel.
  • sliver will be uniformly used in order to indicate both a roving of textile fibres, or a sliver of textile fibres, or, anyway, an aggregate of textile fibres.
  • the bobbin On a drawing frame on which the sliver is collected on bobbins of a traditional type, the bobbin is produced by winding the sliver around an idle roll, driven to revolve by one or more slotted rolls, by means of an active false twisting unit which gives the sliver roundness and mechanical strength and maintains the individuality thereof during the subsequent unwinding process.
  • the active false twisting unit In order to allow a cross-wound sliver bobbin to be formed, the active false twisting unit is supported by a bobbin winding carriage to which a reciprocating movement along a transversal stroke is given, which is substantially equal to the length of the desired bobbin.
  • the sliver must be subjected to the due winding tension prerequisite for a compact bobbin to form, but said tension should be kept sufficiently constant, in order not to reach such values as to modify the dimensional and size characteristics of the sliver between the point of outlet from the outlet calender, and the point wherein the winding operation takes place. Relatively high changes in tension could even cause the sliver to break. One can easily understand how such a breakage would interrupt the production process, obliging the attending operator to take action. The labour cost for these emergency operations represents a considerable factor when the production costs are computed.
  • US-A-3,670,978 proposes, e.g., to make the sliver run inside a ring constituting an intermediate guide, installed, in a movable way, between the point of outlet from the outlet calender of the drawing frame and the bobbin winding system, in such a way that the total of the respective distances of said ring relatively to the outlet from the outlet calender and to the sliver guide remains always constant.
  • several systems have already been proposed and realized which envisage, e.g. articulated toggle-levers, or the like, capable of realizing the desired kinetic system.
  • EP-A-0 070 814 discloses a device, the main task of which is that of compensating the variable distance between the fixed sliver outlet point from the drawing frame and the movable point wherein the winding of the sliver on the bobbin takes place.
  • this known device comprises a flexible support in the form of a spiral element with entry guide ring, positioned upstream the active false twisting unit with revolving funnel.
  • Said spiral element at its end provided with the entry guide ring, is secured by means of a support to the drawing frame, whereas its outlet end is secured to the inlet of the revolving funnel.
  • the sliver is guided by the spiral element along its whole length between the outlet calender of the drawing frame and the revolving funnel and is subjected to fast wear due to the frictional contact with the spiral element.
  • the purpose of the present invention is to provide a twisting device, which avoids the mentioned drawbacks affecting the devices known from the prior art and which is capable of supplying the textile fibre sliver leaving the outlet calender of the drawing frame with an effective bond and compactness between the fibres, already before it enters the active false twisting unit, so as to render the sliver totally elastic and capable of supporting the necessary tension due to the differences in length during the winding operation.
  • the twisting device of the present invention is simply constituted by a spiral element connected only to the bobbin winding carriage, it has a very small inertia as necessary in order not to substantially apply a burden to the active false twisting unit supported by the bobbin winding carriage during its reciprocating motion. Thus, vibrations are avoided and the sliver does not undergo wear and damages.
  • the spiral element gives false twists to the sliver already before it enters the active false twisting unit, supplying it with such a bond and such a compactness between the fibres, as to render it totally elastic and capable of supporting the necessary tension to be applied for performing the cross-winding operation. More specifically, the spiral element performs the task of guiding the tape to the inlet of the revolving funnel, with simultaneously supplying the same sliver a false twist in a predetermined direction running towards the outlet calender and furthermore carries out the first step of sliver compacting and rounding before said sliver enters the active false twisting unit.
  • the twist given to the sliver when this latter leaves the outlet calender by means of the spiral element keeps advantageously mutually bound the fibres which compose the same sliver, making it possible it to be put under tension, in order to elastically extend it, realizing a perfect compensation for the change in distance, with no risk of formation of false drafts. Thanks to this combination, and to this particular arrangement, the compensation and the false sliver twisting are realized by means of simple means, and, thanks to the low weight of the spiral element, the winding speed can be substantially increased on the machine.
  • the whole assembly constituted by the combination of the spiral element and of the revolving funnel is light enough, so that it can be applied to the various machine types, and is also considerably cheap.
  • Said combination makes it possible very fragile slivers to be processed without any difficulties, such as, e.g., slivers constituted by short, low-cohesion fibres and makes it possible breakages and interruptions in the continuity of the fibre aggregate, as well as a mutual slipping of the fibres, and therefore changes in cross-section surface area - which endanger the quality of the same sliver - to be avoided in these cases.
  • the spiral element has a substantially cylindrical shape and an inner diameter of positive value.
  • Said figure is a diagram schematically showing a side view of the twisting device according to the present invention, in upstream cooperation with the outlet calender through which the sliver leaves the drawing frame, and in downstream cooperation with the system of cross winding for the formation of the bobbin on which the sliver is collected.
  • Said ring is given an inner ring surface with a spherical outline converging in the direction of feed of the sliver 6, which results to be guided into the interior of the spiral element 10;
  • 10 is a spiral element having a helical-spring shape, with an inner diameter of positive value, and with a pitch and a number of turns which depend on the spinning frame and on the material being processed.
  • Said spiral element 10 has two ends, one of which is destined to be fastened to the guide ring 8, and the other one is destined to be fastened to the bracket 12; 12 is a bracket which makes it possible the spiral element 10 to be rigidly connected to the active false twisting unit; 14 is the body of the false twisting unit; 16 is the revolving funnel of the body 14, for giving the sliver 6 false twists necessary for supplying said sliver with roundness and mechanical strength before it is collected on the periphery of the bobbin 30 under way of formation; 18 is the connection and support plate for supporting the body 14, and connecting it to the reciprocating carriage 20, driven to move parallelly to the axis of the bobbin 30 under way of formation; 24 is the sleeve sliding along the cylindrical guide bar 22 positioned parallel to the axis 34 of the roll 32 which drives the bobbin under way of formation 30; 26 is the flat structural shape which supports the whole carriage 20 provided with reciprocating motion with a transversal stroke substantially equal to the axial length of the desired
  • the sliver, or roving, or aggregate of fibres leaving the outlet calender 3 is entered into the guide ring 8 through the side slot and is conveyed, through the spiral, element 10, into the revolving funnel 16 in order to be collected on the periphery of the bobbin under way of formation 30 revolving on the winding spindle 28.
  • the shape, the ratios and the size of the parts may be changed;
  • the wire which constitutes the spiral element may be of a different suitable material;
  • the anchoring elements 12 and 18 may be given a different shape, or may be mounted in a different way, without thereby departing from the scope of the solution as proposed by the present invention, as claimed in the hereto appended claim.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
EP88200983A 1987-06-19 1988-05-17 Twisting device for giving a false twisting to a textile fibre sliver Expired - Lifetime EP0295731B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT20959/87A IT1205058B (it) 1987-06-19 1987-06-19 Dispositivo torsionatore per carro bobinatore
IT2095987 1987-06-19

Publications (2)

Publication Number Publication Date
EP0295731A1 EP0295731A1 (en) 1988-12-21
EP0295731B1 true EP0295731B1 (en) 1992-11-04

Family

ID=11174643

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88200983A Expired - Lifetime EP0295731B1 (en) 1987-06-19 1988-05-17 Twisting device for giving a false twisting to a textile fibre sliver

Country Status (5)

Country Link
EP (1) EP0295731B1 (enExample)
DE (1) DE3875656T2 (enExample)
ES (1) ES2037199T3 (enExample)
GR (1) GR3006374T3 (enExample)
IT (1) IT1205058B (enExample)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1223525B (it) * 1987-12-18 1990-09-19 Savio Spa Dispositivo torsionatore con spirale rotante per carro bobinatore
IT1223533B (it) * 1987-12-18 1990-09-19 Savio Spa Elemento a spirale rotante per impartire compensazione e falsa torsione ai nastri di fibre tessili
IT1237925B (it) * 1989-12-21 1993-06-18 Savio Spa Dispositivo torsionatore perfezionato per carro bobinatore che permette di formare bobine compatte
IT1237922B (it) * 1989-12-21 1993-06-18 Savio Spa Dispositivo torsionatore perfezionato per carro bobinatore che permette di formare una bobina di perfetta forma cilindrica

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2104923A (en) * 1981-07-03 1983-03-16 Sant Andrea Novara Officine Sliver winder with traversing false twister

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH427589A (de) * 1964-03-09 1966-12-31 Reiter Michael Beweglicher Band- oder Vorgarnführer zum Herstellen von Kreuzwickeln
BE659089A (enExample) * 1965-01-29
FR1502636A (fr) * 1966-01-21 1967-11-24 Schlumberger Cie N Perfectionnements aux entonnoirs tournants utilisés pour l'enroulage des rubans de fibres en bobines croisées
US3670978A (en) * 1970-10-02 1972-06-20 Warner Swasey Co Compensator device
AU8554382A (en) * 1981-07-20 1983-01-27 Officine Savio S.P.A. Compensator device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2104923A (en) * 1981-07-03 1983-03-16 Sant Andrea Novara Officine Sliver winder with traversing false twister

Also Published As

Publication number Publication date
IT8720959A0 (it) 1987-06-19
IT1205058B (it) 1989-03-10
ES2037199T3 (es) 1993-06-16
DE3875656D1 (de) 1992-12-10
GR3006374T3 (enExample) 1993-06-21
EP0295731A1 (en) 1988-12-21
DE3875656T2 (de) 1993-04-15

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