EP0350797B1 - Streckwerk für Spinnmaschinen - Google Patents

Streckwerk für Spinnmaschinen Download PDF

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Publication number
EP0350797B1
EP0350797B1 EP89112413A EP89112413A EP0350797B1 EP 0350797 B1 EP0350797 B1 EP 0350797B1 EP 89112413 A EP89112413 A EP 89112413A EP 89112413 A EP89112413 A EP 89112413A EP 0350797 B1 EP0350797 B1 EP 0350797B1
Authority
EP
European Patent Office
Prior art keywords
rollers
roller
pair
fibre
fiber
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
EP89112413A
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German (de)
English (en)
French (fr)
Other versions
EP0350797A1 (de
Inventor
Rudolf Wehrli
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.)
Maschinenfabrik Rieter AG
Original Assignee
Maschinenfabrik Rieter AG
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 Maschinenfabrik Rieter AG filed Critical Maschinenfabrik Rieter AG
Priority to AT89112413T priority Critical patent/ATE94224T1/de
Publication of EP0350797A1 publication Critical patent/EP0350797A1/de
Application granted granted Critical
Publication of EP0350797B1 publication Critical patent/EP0350797B1/de
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
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/26—Drafting machines or arrangements without fallers or like pinned bars in which fibres are controlled by one or more endless aprons
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/20—Drafting machines or arrangements without fallers or like pinned bars in which fibres are controlled by contact with stationary or reciprocating surfaces

Definitions

  • This invention relates to a drafting system for spinning machines, in particular for spinning machines for the production of finer yarns from short staple fibers, for example jet spinning machines for processing fibers up to a fiber length of 60 mm, the application to other spinning machines (for example ring spinning machines) and in the processing of longer fibers is also provided and claimed accordingly.
  • a drafting device is usually used to refine this structure before the actual spinning. It is known, for example from our European patent EP-B-107 828, that fiber guidance in the last draft zone of the drafting system is particularly important when producing finer yarns.
  • the patent mentioned accordingly proposes an offset arrangement of the aprons, which brings clear advantages over a known double apron drafting system. With this drafting system, the ambient air flow of the rotating rollers is practically kept away from the converging space of the pair of delivery rollers, so that the uneven fiber spreading and detachment of the edge fibers of the fiber sliver is substantially prevented.
  • a double apron drafting system is the current standard version for ring spinning machines. It is therefore only natural to use such well-known drafting arrangement for the newer spinning processes, for example for nozzle spinning.
  • some disadvantages have to be accepted, in particular the problems of periodically replacing the lower apron, which in the whole Arrangement is not easy to get out or easy to reinsert.
  • a drafting device for stretching bast fibers such as jute or flax is known from British patent GB-A 883 823, which, as is known, has a much longer pile length than cotton.
  • the drafting system consists of a pair of feed rollers, an apron stretched over two rollers and a middle roller pressing against the apron.
  • the drawn fibers are drawn off with a subsequent pair of delivery rollers.
  • a curved breast plate is provided between the pair of feed rollers and the apron in order to deflect the fibers and thus slow them down during warping.
  • the sliver can also be formed by a condenser in front of the pair of feed rollers before entering the nip line. Such a drafting system is therefore unsuitable for the warping of short staple fibers.
  • the invention accordingly relates to a drafting system for a fine spinning machine with a delivery roller pair containing a converging space and an upstream work group with a large roller and an apron moved by a smaller roller.
  • the delivery roller pair mentioned and the work group mentioned can together represent the last draft zone of the drafting system, although this is not essential to the invention in the broadest sense.
  • the inventive drafting device is characterized in that a fiber guiding element is arranged between the work group and the pair of rollers, which deflects the fiber stream to be drawn over its surface facing away from the apron, before the fiber stream enters the converging space of the pair of delivery rollers in such a way that the fiber guiding element passes through the Rotational movement of the air currents generated in a targeted manner.
  • the guide element thus provides the fibers with a guide surface between the outlet of the upstream work group and the inlet, usually the clamping line, of the subsequent pair of rollers. This surface should be curvilinear in the direction of the fiber flow. The easiest way is to have a constant radius, but more complicated shapes can also be used to achieve better guidance.
  • the guide element can be in the form of a rod that can be inserted between the working groups. In cross section, however, the element could also be strip-shaped.
  • fiber guide element is not necessarily to be understood as an “element from one piece”.
  • the element can be formed from a plurality of mutually cooperating components.
  • the provision of interruptions in the fiber guide surface will prove to be disadvantageous, however, since single fibers can be clamped in such interruptions.
  • the fiber guide element is thus arranged such that it causes the fibers supplied by the upstream work group to be stripped off the roller of this work group, but without touching this roller, in order to guide the fibers into the converging space of the subsequent pair of rollers.
  • the wiping and guiding function of the fiber guiding element depends on the air balance, i.e. on the air currents within the space between the working groups.
  • the guide element is also designed as a limiting element in order to limit the width of the fiber stream in the transverse direction, that is to say the guide element also serves as a fiber condenser.
  • Fig. 1 shows schematically in cross section a two-zone drafting system of a spinning machine with a pair of input rollers 2, a pair of delivery rollers 4 and an intermediate work group 6.
  • the latter consists of a roller 8, for example in the form of a section of a cylinder extending over the length of the machine or else can also be designed as a roller provided for each spinning position.
  • An apron 10 cooperates with the roller 8 to form the work group 6.
  • the drafting arrangement shown in FIG. 1 is a so-called KEPA drafting system, for example from the book “The drafting systems of spinning machines” by Dr. Ing. W. Wegener (1965 edition, Springer Verlag, page 315), known for ring spinning or flyer spinning in the long-stack area.
  • this arrangement has the disadvantage of poorer fiber guidance between the outlet of the work group 6 and the inlet of the pair of delivery rollers 4, that is to say between the last contact line X of the apron 10 with the roller 8 and the clamping line Y des Delivery roller pair 4.
  • the poorer fiber guidance is due to a geometrically determined, uncontrolled length of the fiber assembly between the work group 6 and the delivery roller pair 4. This arrangement is therefore unsuitable for so-called nozzle spinning, since this spinning process is intended in particular for the production of finer yarns.
  • a nozzle element D is only indicated with a dashed line in FIG. 1, since this invention is not restricted to use in connection with nozzle spinning.
  • so-called false twist spinning in general, that is to say whether or not nozzles are used to produce the false twist effect.
  • the changes to this state of the art to be described can also be of advantage in the classic spinning process (ring spinning).
  • FIG. 2 shows a first further development of the arrangement of the prior art shown in FIG. 1. Since the delivery roller pair 4, roller 8 and apron 10 are essentially unchanged from FIG. 1, the same reference numerals have been used in FIG. 2 (and later also in FIGS. 3 and 4). Between the outlet X and the inlet Y, however, a guide element 12 is now switched on in order to guide the fibers to be drawn in this second zone of the drafting system.
  • the element consists of a D-shaped rod, with the flat surface of this rod facing up (i.e. facing strappy 10) and the curved surface of the rod facing down (i.e. facing strappy 10).
  • the roller 8 and the lower roller of the delivery pair 4 rotate in the counterclockwise direction, as indicated by arrows on these rollers.
  • the rotation of the roller 8 produces a shortly after the exit line X.
  • Air flow L which also flows counterclockwise according to FIG. 2.
  • the rotation of the lower roller of the pair of rollers 4 generates an air flow S which also flows counterclockwise according to FIG. 2, but flows in the opposite direction to the flow L.
  • the fibers (not shown) emerging from the working group 6 initially try to follow the air flow L and move along the surface of the roller 8.
  • the effect of the flow L diminishes shortly after passing the guide element 12, while the effect of the flow S, which is much stronger due to the process, builds up in this area.
  • the fibers are stripped from the roller 8 by this air flow and placed over the curved surface of the rod 12 on the surface of the lower delivery roller and thereby conveyed into the clamping line Y. Accordingly, the effect of the guide element 12 is mainly to design the air balance within the space between the working groups 6 and 4 and in particular to enable the desired stripping or import air flows.
  • FIG. 3 shows a further variant of the new drafting arrangement, the only difference compared to the arrangement from FIG. 2 being that the rod 12A is round (instead of D-shaped) in cross section. The effect is the same.
  • FIG. 3A shows a further advantageous modification in that the rod 12A has a smaller diameter in its fiber-carrying working area than in its end area.
  • the annular surfaces 16 thus serve as fiber flow limiting means, which define the maximum width B of the fiber stream (the sliver to be drawn) in the second zone of the drafting system.
  • the part of the smaller diameter can be cylindrical (solid lines) or concave or convex (dashed) or with a shape that has different curvatures.
  • the fiber distribution at the outlet roller pair 4 can thus be influenced.
  • the rod 12A is preferably arranged in a stationary manner in order to make the drafting arrangement simple.
  • the rod 12A could, however, be rotated about its own longitudinal axis during operation.
  • the rod 12A is rotated clockwise as shown in Figure 3, the associated air flows will increase the flows L and S already mentioned.
  • Fig. 4 shows a further variant, according to which the guide element 12B in the form of a curved plate between the work groups 6 and 4 is switched on. The effect is the same as that of the arrangement of FIG. 2.
  • Fig. 5 shows (still in a simplified, schematic representation) a practical example of the new drafting system.
  • Each bottom roller 2A, 8, 4A is on one corresponding drive shaft 20, 22, 24 carried in the machine frame (not shown).
  • the upper rollers 2B, 26.4B are each held on a shoulder 30, 32, 34 carried by a pendulum arm 28.
  • the arm 28 is pivotable about the axis 36 to open the drafting system or to press the upper rollers against the lower rollers.
  • a support plate 31 is mounted on the arm and carries three bolts 33 running parallel to the axis 36.
  • the lugs 30, 32, 34 are each pivotably suspended on a bolt 33 and are biased by spring-loaded elements 35 against the lower rollers 2A, 8.4A (only the biasing elements 35 for the lugs 30 and 34 are visible in FIG. 5).
  • the strap 10 runs around the top roller 26 and a guide bridge 38, which is also carried by the pendulum arm 28 over the carrier plate 31.
  • the bridge 38 is also rotatably mounted on a pin 37 which is biased against the roller 8 by its own loading element 39 (only indicated schematically).
  • the rollers are overhung on their carrier attachments.
  • the guide rod 12A (according to FIGS. 3 and 3A) could also be carried by the pendulum arm 28 via a corresponding approach, not shown, in such a way that the rod with the arm 28 pivots about the axis 36.
  • the rod is preferably mounted in the machine frame in such a way that distances a, b between the rod 12A and the rollers 8, 4A remain. These distances are preferably in the range between 0.1 mm and 0.5 mm, the roller 8 for processing short staple fibers having a diameter of 50 to 60 mm and the roller 4A having a diameter of 25 to 30 mm.
  • the roller 8 can have a diameter of approximately 150 mm.
  • Fig. 5 also shows schematically a suction device 40 for leading away any fibers which adhere to the surfaces of the rollers 8 and 4A.
  • a condenser K (dashed) can be arranged in front of the pair of insertion rollers 2 in order to feed a sliver (not shown) to be stretched cleanly and with a width determined by the condenser into the drafting system.
  • a nozzle D (indicated only by dashed lines) takes over the fibers from the pair of delivery rollers 4.
  • the distances between the outlet of the working group 6 and the guide element 12 and, on the other hand, between the element 12 and the inlet of the working group 4 are chosen to be as small as the geometry of the arrangement and the dimensions of the elements allow.
  • the roller 8 in the KEPA drafting system must be designed as a so-called "adhesive roller". It is made of rubber or steel or another material with a treated surface to optimize the fiber adhesion. In the case of a steel roller, the desired adhesive effect can be achieved by sandblasting or a coating (e.g. plasma or diamond coating).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP89112413A 1988-07-15 1989-07-07 Streckwerk für Spinnmaschinen Expired - Lifetime EP0350797B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89112413T ATE94224T1 (de) 1988-07-15 1989-07-07 Streckwerk fuer spinnmaschinen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH272388 1988-07-15
CH2723/88 1988-07-15

Publications (2)

Publication Number Publication Date
EP0350797A1 EP0350797A1 (de) 1990-01-17
EP0350797B1 true EP0350797B1 (de) 1993-09-08

Family

ID=4240157

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89112413A Expired - Lifetime EP0350797B1 (de) 1988-07-15 1989-07-07 Streckwerk für Spinnmaschinen

Country Status (7)

Country Link
US (1) US5048157A (ja)
EP (1) EP0350797B1 (ja)
JP (1) JPH0268317A (ja)
KR (1) KR900001895A (ja)
CN (1) CN1039632A (ja)
AT (1) ATE94224T1 (ja)
DE (1) DE58905513D1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1469107A2 (de) * 2003-04-15 2004-10-20 Maschinenfabrik Rieter Ag Textilmaschine mit einem Streckwerk
WO2011097746A1 (de) 2010-02-12 2011-08-18 Maschinenfabrik Rieter Ag Streckwerk für eine spinnmaschine

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5531063A (en) * 1989-06-15 1996-07-02 The United States Of America As Represented By The Secretary Of The Department Of Agriculture Device for forming core/wrap yarn
DE4242722A1 (de) * 1992-12-17 1994-06-23 Rieter Ingolstadt Spinnerei Druckstab
DE50101978D1 (de) * 2000-11-28 2004-05-19 Truetzschler Gmbh & Co Kg Verfahren und Vorrichtung an einer Spinnereimaschine zum Verziehen eines textilen Faserverbandes, z.B. aus Baumwolle, Chemiefasern u. dgl.
DE20221912U1 (de) * 2002-11-11 2009-06-10 Spindelfabrik Suessen Gmbh Spinnmaschine mit Verdichtungseinrichtung
GB2420124A (en) * 2004-11-11 2006-05-17 Lakshminaickenpalayam Govindas Fibre drafting apparatus
JP2006200069A (ja) * 2005-01-20 2006-08-03 Murata Mach Ltd 空気式精紡機におけるドラフト装置
JP4613902B2 (ja) * 2005-10-19 2011-01-19 Ｓｍｃ株式会社 トラニオン支持金具付き流体圧シリンダ
US8387515B2 (en) * 2006-10-18 2013-03-05 Smc Kabushiki Kaisha Fluid pressure cylinder with trunnion support fitting
DE102006051875A1 (de) * 2006-10-31 2008-05-08 Maschinenfabrik Rieter Ag Kepa-Streckwerk für eine Spinnmaschine
DE102008022293A1 (de) 2008-04-28 2009-10-29 Maschinenfabrik Rieter Ag Streckwerk zum Verziehen eines Faserverbandes
KR100887553B1 (ko) 2008-08-20 2009-03-09 김병수 정방기의 크레이들 플리스 가이드
ES1234294Y (es) * 2019-07-10 2019-12-03 Trias Juan Rovira Dispositivo de estiraje de fibras para mecheras

Family Cites Families (18)

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BE537982A (ja) *
DE98477C (ja) *
GB107276A (en) * 1916-02-16 1917-06-28 Jan Frederik Jannink Improvements in or relating to Roller Drawing Heads for Cotton Spinning.
US1559281A (en) * 1924-05-10 1925-10-27 Rushton James Lever Drawing mechanism for ring-spinning frames and the like
DE742141C (de) * 1941-08-16 1943-11-23 F X Richter Ges M B H Verfahren und Vorrichtung zum Verlaengern des Streckweges eines Baumwollstreckwerkes beim UEbergang auf die Verwendung langstapeliger Spinnstoffe
GB694817A (en) * 1951-02-28 1953-07-29 Tmm Research Ltd Improvements in textile drafting apparatus
BE514891A (fr) * 1951-11-08 1954-07-09 Textile De Breuches Soc Systeme etireur pour machines de preparation et de filature du coton et autres fibres.
FR1118008A (fr) * 1954-01-21 1956-05-30 Schubert & Salzer Maschinen Banc d'étirage incliné pour machines textiles
DE1006766B (de) * 1954-02-08 1957-04-18 Rieter Joh Jacob & Cie Ag Streckwerk mit zwischen Eingangs- und Ausgangswalzen angeordnetem Trennorgan zum Bilden eines Stapelfaserbandes aus einem Buendel endloser Kunstfaeden
GB883823A (en) * 1957-01-31 1961-12-06 Fairbairn Lawson Combe Barbour Drafting devices for textile spinning frames
CH350904A (de) * 1957-05-11 1960-12-15 Rieter Joh Jacob & Cie Ag Halterung des Verdichtungstrichterpaares an einem Zweiriemchen-Streckwerk
GB993844A (en) * 1960-11-20 1965-06-02 Mackie & Sons Ltd J Improvements relating to textile drafting apparatus
DE2125616A1 (en) * 1971-05-24 1972-12-07 Industriewerk Schaeffler Ohg, 8522 Herzogenaurach 3-cylinder drafting - input nip to apron distance exceeds staple length, thread partially supported between, with additional input nip
GB1378177A (en) * 1971-06-18 1974-12-27 Mackie & Sons Ltd J Textile drafting machines
DE3048501C2 (de) * 1980-12-22 1983-06-30 Zinser Textilmaschinen Gmbh, 7333 Ebersbach Kämmstrecke
IT1140368B (it) * 1981-01-02 1986-09-24 Skf Kugellagerfabriken Gmbh Dispositivo di bloccaggio dello stoppino in stiratoi di filatoi
JPS5971419A (ja) 1982-10-11 1984-04-23 マシ−ネンフアブリク・リ−タ−・アクチエンゲゼルシヤフト 精紡機用ドラフト機構
GB8415214D0 (en) * 1984-06-14 1984-07-18 Magnavac Air Systems Ltd Dust extractor for drawframe

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1469107A2 (de) * 2003-04-15 2004-10-20 Maschinenfabrik Rieter Ag Textilmaschine mit einem Streckwerk
EP1469107A3 (de) * 2003-04-15 2005-08-31 Maschinenfabrik Rieter Ag Textilmaschine mit einem Streckwerk
WO2011097746A1 (de) 2010-02-12 2011-08-18 Maschinenfabrik Rieter Ag Streckwerk für eine spinnmaschine

Also Published As

Publication number Publication date
DE58905513D1 (de) 1993-10-14
US5048157A (en) 1991-09-17
EP0350797A1 (de) 1990-01-17
KR900001895A (ko) 1990-02-27
CN1039632A (zh) 1990-02-14
JPH0268317A (ja) 1990-03-07
ATE94224T1 (de) 1993-09-15

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