EP0333662A1 - Système d'étirage pour fibres textiles - Google Patents

Système d'étirage pour fibres textiles Download PDF

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Publication number
EP0333662A1
EP0333662A1 EP89810189A EP89810189A EP0333662A1 EP 0333662 A1 EP0333662 A1 EP 0333662A1 EP 89810189 A EP89810189 A EP 89810189A EP 89810189 A EP89810189 A EP 89810189A EP 0333662 A1 EP0333662 A1 EP 0333662A1
Authority
EP
European Patent Office
Prior art keywords
nip
pressure
roller
pressure roller
drafting
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Withdrawn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
EP89810189A
Other languages
German (de)
English (en)
Inventor
Louis Vignon
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
Heberlein Hispano SA
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, Heberlein Hispano SA filed Critical Maschinenfabrik Rieter AG
Publication of EP0333662A1 publication Critical patent/EP0333662A1/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Withdrawn legal-status Critical Current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
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/46—Loading arrangements
    • D01H5/52—Loading arrangements using fluid pressure
    • D01H5/525—Loading arrangements using fluid pressure for top roller arms
    • 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
    • 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
    • D01H5/22—Drafting machines or arrangements without fallers or like pinned bars in which fibres are controlled by rollers only
    • 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
    • D01H5/56—Supports for drafting elements
    • D01H5/565—Top roller arms

Definitions

  • the invention relates to a drafting device for textile fibers, which has an input nip between a first drawing roller and a first pressure roller, at least a middle nip between a second drawing roller and a second printing roller, an output nip between a third drawing roller and a third printing roller and Contains means for exerting pressure forces on the pressure rollers, an additional nip with a fourth pressure roller being arranged between the input nip and the middle nip and an additional nip with a fifth pressure roller being arranged between the middle nip and the output nip.
  • the additional nip with the fourth pressure roller serves to hold the shorter fibers in a sliver to be processed after they have left the input nip until they are gripped by the middle nip, after which the fibers then through the additional nip slide.
  • the fourth pressure roller rotates at the same peripheral speed as the rollers of the inlet nip.
  • the additional nip with the fifth pressure roller serves to hold the shorter fibers in front of the exit nip.
  • the distances between the inlet nip and the middle nip as well as between this and the outlet nip are - as in other known drafting systems - adjustable so that they can be adapted to the greatest stack length of different fiber slivers to be processed.
  • This adjustability of the stretching rollers and pressure rollers is necessary however, a rather complex construction. In addition, the adjustment is also relatively tedious.
  • the object of the invention is therefore to design a drafting arrangement of the type specified at the outset in such a way that adaptation to different stack lengths is possible without adjusting the roller spacings.
  • the drafting system according to the invention is characterized in that the fourth and fifth pressure rollers cooperate with the second drafting roller to form the two additional clamping points, and in that the means for exerting pressure forces are set up on the fourth pressure roller and the fifth pressure roller to exert pressure forces which are adjustable equal to or less than the pressure forces exerted on the first, the second and the third pressure roller.
  • the peripheral speeds in the two additional nip points are the same as in the middle nip point, since these three nip points are all jointly delimited by the second stretch roller. This makes it possible to adapt to different stack lengths without changing the distances between the clamping points. If the stack length is smaller than the distance between the input nip and the adjacent additional nip or the distance between the output nip and the adjacent additional nip, then apply the same pressure to the fourth and fifth pressure rollers as on the first, second and third pressure roller. The delay then takes place between the input terminal and the adjacent additional terminal as well as between the other additional terminal and the output terminal.
  • an adjustable friction brake can be used for shorter fibers in front of the exit nip arrange element.
  • the pressure forces exerted on the fourth and fifth pressure roller become smaller set so that the warping occurs more or less between the input nip and the middle nip as well as between the middle nip (or one of the middle nips) and the output nip.
  • the additional nip in front of the exit nip leads the shorter fibers in the sliver in front of the exit nip.
  • the drafting system according to the invention has the additional advantage that the fibers are drawn from the input nip not only from the middle nip, but also - more or less - from the equally fast additional nip in front of the middle nip, which in particular is important for thick slivers with fibers that are still not very parallel.
  • a sixth pressure roller can also cooperate with the second stretching roller to form a second middle nip.
  • the bearings of the first, second and fourth printing rollers can be held in a first frame and the bearings of the third, fifth and sixth printing rollers can be held in a second frame.
  • the two frames can each be pivoted about an axis perpendicular to the axes of the printing rollers.
  • the drafting system shown has three driven drawing rollers 1, 2 and 3 made of metal, which are mounted in a manner not shown in bearings attached to two frame side plates 4 and 5, and six pressure rollers 6, 7, 8, 9, 10 and 11, each with are provided with a rubber cover.
  • the first pressure roller 6 forms an input nip with the first stretch roller 1.
  • the second pressure roller 7 forms a middle nip with the second stretch roller 2.
  • the third pressure roller 8 forms with the third stretching roller 3 an exit nip.
  • an additional clamping point is arranged between the input clamping point (6-1) and the middle clamping point (7-2). This is formed by the fourth pressure roller 9 and the second stretching roller 2.
  • a second additional nip formed by the fifth pressure roller 10 and the second stretching roller 2 lies between a second middle nip formed by the sixth pressure roller 11 and the second stretching roller 2 and the exit nip (8-3).
  • the diameter of the second drafting roller 2 is approximately 2 to 4 times the diameter of the first drafting roller 1 and the third drafting roller 3.
  • a sliver to be drawn passes through essentially three zones, namely a pre-drafting zone which extends from the input Nip (6 - 1) to the first additional clamping point (9 - 2) or to the first middle clamping point (7 - 2), a neutral zone from the first middle clamping point (7 - 2) to the second middle clamping point (11 - 2 ) and a main draft zone, which extends from the second additional clamping point (10-2) or from the second middle clamping point (11-2) to the output clamping point (8-3).
  • the bearings L of the first, the second and the fourth pressure rollers 6, 7 and 9 are held in a bridge-like frame, which consists of two lateral blocks 12 and 13, which are connected to one another by two angle profiles 14 and 15.
  • the bearings L of the third, fifth and sixth pressure rollers 8, 10 and 11 are held in a second bridge-like frame, which consists of two lateral blocks 16 and 17, which are connected by two angle profiles 18 and 19.
  • Each of the blocks 12, 13, 16 and 17 contains, for each bearing L held therein, a cylinder Z with a piston K which acts on the bearing L in question via a force transmission lever H in order to press the relevant pressure roller against the associated stretching roller. Thanks to the strengthening of the levers H, it is possible to operate the cylinder-piston units Z, K with compressed air and thus exert the desired pressure force on the pressure rollers despite the limited diameter of the cylinders Z.
  • the compressed air supply lines to the cylinders Z have not been shown.
  • the sliver to be processed is smaller than the distance between the input nip (6 - 1) and the first additional nip (9 - 2) or the Ab stood between the second additional terminal point (10 - 2) and the output terminal point (8 - 3).
  • the sliver is warped between the input nip (6 - 1) and the first additional nip (9 - 2) and between the second additional nip (10 - 2) and the output nip (9 - 3) .
  • a friction brake element 20 (FIG. 1) which can be adjusted transversely to the sliver and which somewhat retains the shorter fibers in the fiber mixture.
  • an endless guide strap 40 can be provided to guide the fibers between the second additional nip (10-2) and the exit nip (8-3), which has the fifth pressure roller 10 and a small deflection roller 41 wraps around.
  • the deflection roller 41 is supported at its two ends in bearings, not shown, which are held in blocks 16 and 17.
  • An adjusting screw 42 acts on each of these bearings.
  • the length of the fibers is greater and between the distance from the clamping point (6 - 1) to the clamping point (9 - 2) (or from the clamping point (10 - 2) to the clamping point (8 - 3)) and the distance from the Nip point (6 - 1) to the nip point (7 - 2) (or from the nip point (11 - 2) to the nip point (8 - 3)), then the pressure which corresponds to the pressure rollers 9 and 10 assigned cylinders Z is reduced, so that the pressure forces exerted on the pressure rollers 9 and 10 become smaller than the pressure forces exerted on the pressure rollers 6, 7, 11 and 8.
  • the warping of the sliver then takes place more or less between the nip (6 - 1) and the nip (7 -2) and between the Terminal point (11 -2) and the terminal point (8 - 3) instead.
  • styli T are also slidably mounted, each of which is assigned to one of the bearings L.
  • the feeler pins T rest on the respective bearing L or on the lever H belonging to it. If a winding forms on one of the rollers, one or more of the styli T are thereby displaced.
  • each of the blocks 12, 13, 16 and 17, three of the styli T are mounted, the free ends of which each rest against a common switch actuating arm S which is pivotably mounted in the block in question.
  • Each switch actuating arm S actuates, when it is pivoted out of the position shown by one of the feeler pins T, in each case a switch (not shown) for switching off the drafting system.
  • the drafting system is therefore switched off automatically as soon as any one or more of the styli T are displaced by a winding.
  • the block 12 of the first frame 12, 13, 14, 15 is pivotally mounted on a shaft 22 which is held in two bearing blocks 23 and 24 fastened to the frame side plate 4.
  • a shaft 26 which can be pivoted by means of a lever 25 (FIG. 2) is mounted in the block 13.
  • the shaft 26 has end sections with diametrically opposite flats 26a (FIG. 3), which extend in keyhole-shaped recesses in cross section in two bearing blocks 27 and 28 fastened to the frame side plate 5. In the illustrated position of the shaft 26, its end sections are retained in the large parts of the keyhole-shaped recesses.
  • the frame 12, 13, 14, 15 is thus locked in the drawn working position.
  • the block 16 of the second frame 16, 17, 18, 19 is pivotally mounted on a shaft 31 which is held in the bearing block 23 and a further bearing block 32 fastened to the frame side plate 4.
  • a shaft 34 is pivoted by means of a lever 33 (FIG. 2).
  • the shaft 34 has end sections with diametrically opposite flats 34a, which extend in keyhole-shaped recesses in the bearing block 28 and in a further bearing block 35 fastened to the frame side plate 5. After the shaft 34 has been pivoted through 89 °, its end sections can pass through the slots 36 and 37 of the keyhole-shaped recesses, which are open to the side, because of the flats 34a, so that the frame 16, 17, 18, 19 can then be pivoted about the shaft 31 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP89810189A 1988-03-15 1989-03-10 Système d'étirage pour fibres textiles Withdrawn EP0333662A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH97888 1988-03-15
CH978/88 1988-03-15

Publications (1)

Publication Number Publication Date
EP0333662A1 true EP0333662A1 (fr) 1989-09-20

Family

ID=4199627

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89810189A Withdrawn EP0333662A1 (fr) 1988-03-15 1989-03-10 Système d'étirage pour fibres textiles

Country Status (3)

Country Link
US (1) US4999884A (fr)
EP (1) EP0333662A1 (fr)
JP (1) JPH0214026A (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT237101Y1 (it) * 1994-08-13 2000-08-31 Truetzschler & Co Dispositivo per la sorveglianza di una formazione di avvolgimentisu almeno una coppia di cilindri conducente un nastro di carda
US5761772A (en) * 1996-07-19 1998-06-09 North Carolina State University Securing and pressuring system for drafting rollers for automated textile drafting system
CN1475614A (zh) 2002-07-29 2004-02-18 特鲁菲舍尔股份有限公司及两合公司 在用于纺织纤维条的并条机上对拉伸系统的上罗拉增重的装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR670169A (fr) * 1928-03-01 1929-11-26 Benigno Crespi Banc d'étirage à plusieurs paires de cylindres particulièrement applicable aux bancs à broches, aux métiers à filer continus (rings), aux renvideurs automatiques (selfectings) pour la filature du coton et d'autres fibres textiles de même nature
US2813309A (en) * 1954-08-17 1957-11-19 Saco Lowell Shops Drawing mechanisms
DE1156686B (de) * 1961-09-16 1963-10-31 Zinser Textilmaschinen Gmbh Pneumatische oder hydraulische Belastung von Oberwalzen in Spinnereimaschinenstreckwerken
DE1250315B (de) * 1962-07-23 1968-03-21 TMM (Research) Limited Hartford Works Oldham Lancashire (Großbntan men) Streckweik fur Spmnereimaschi nen
DE2139307A1 (de) * 1969-12-05 1973-02-15 Sant Andrea Novara Officine Streckwerk mit starker verfeinerung zum verstrecken diskontinuierlicher textilfasern

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB468850A (fr) * 1935-01-15 1937-07-14
DE804773C (de) * 1949-04-13 1951-12-13 Alsacienne Constr Meca Streckwerk
US2815538A (en) * 1955-06-23 1957-12-10 Spinnerei Karl Marx Veb Drawing frame for a spinning machine
US2890495A (en) * 1957-07-25 1959-06-16 Alsacienne Constr Meca Textile drafting apparatus
US3303534A (en) * 1963-08-21 1967-02-14 S O M Andreani & C Double apron drafting system for drawing frames
US3304584A (en) * 1964-10-07 1967-02-21 Maremont Corp Drafting mechanism
SU821553A1 (ru) * 1979-05-28 1981-04-15 Ивановское Специальное Конструктор-Ckoe Бюро Чесальных Машин Выт жной прибор
DE2941612A1 (de) * 1979-10-13 1981-04-23 Zinser Textilmaschinen Gmbh, 7333 Ebersbach Strecke
EP0062185B2 (fr) * 1981-04-06 1991-02-27 Maschinenfabrik Rieter Ag Dispositif d'étirage d'une bande de fibres pour machines de filature
JPS5915520A (ja) * 1982-07-15 1984-01-26 Toyoda Autom Loom Works Ltd ドラフト機構のロ−ラ加圧装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR670169A (fr) * 1928-03-01 1929-11-26 Benigno Crespi Banc d'étirage à plusieurs paires de cylindres particulièrement applicable aux bancs à broches, aux métiers à filer continus (rings), aux renvideurs automatiques (selfectings) pour la filature du coton et d'autres fibres textiles de même nature
US2813309A (en) * 1954-08-17 1957-11-19 Saco Lowell Shops Drawing mechanisms
DE1156686B (de) * 1961-09-16 1963-10-31 Zinser Textilmaschinen Gmbh Pneumatische oder hydraulische Belastung von Oberwalzen in Spinnereimaschinenstreckwerken
DE1250315B (de) * 1962-07-23 1968-03-21 TMM (Research) Limited Hartford Works Oldham Lancashire (Großbntan men) Streckweik fur Spmnereimaschi nen
DE2139307A1 (de) * 1969-12-05 1973-02-15 Sant Andrea Novara Officine Streckwerk mit starker verfeinerung zum verstrecken diskontinuierlicher textilfasern

Also Published As

Publication number Publication date
US4999884A (en) 1991-03-19
JPH0214026A (ja) 1990-01-18

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