EP1809795B1 - A drafting assembly and method of drafting a web - Google Patents

A drafting assembly and method of drafting a web Download PDF

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Publication number
EP1809795B1
EP1809795B1 EP05807866A EP05807866A EP1809795B1 EP 1809795 B1 EP1809795 B1 EP 1809795B1 EP 05807866 A EP05807866 A EP 05807866A EP 05807866 A EP05807866 A EP 05807866A EP 1809795 B1 EP1809795 B1 EP 1809795B1
Authority
EP
European Patent Office
Prior art keywords
drafting
nip
nip point
web
assembly
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.)
Not-in-force
Application number
EP05807866A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1809795A1 (en
Inventor
Cherian Iype
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.)
Super Spinning Mills Ltd
Original Assignee
Super Spinning Mills Ltd
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Filing date
Publication date
Application filed by Super Spinning Mills Ltd filed Critical Super Spinning Mills Ltd
Publication of EP1809795A1 publication Critical patent/EP1809795A1/en
Application granted granted Critical
Publication of EP1809795B1 publication Critical patent/EP1809795B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/02—Carding machines
    • D01G15/12—Details
    • D01G15/46—Doffing or like arrangements for removing fibres from carding elements; Web-dividing apparatus; Condensers
    • D01G15/64—Drafting or twisting apparatus associated with doffing arrangements or with web-dividing apparatus
    • 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

Definitions

  • the present invention relates to a drafting assembly and method of drafting. More particularly, but not exclusively, the present invention relates to a drafting apparatus comprising two pairs of drafting aprons separated by a gap and arranged to generate a drafting force on fibres in a web which span the gap; the drafting aprons each being substantially wedge shaped proximate to the nip points.
  • the drafting apparatus comprises front and rear roller pairs.
  • the front roller pair rotate more quickly than the rear pair so creating a drafting force on the fibres in the sliver or strand.
  • Such an apparatus is suitable for drafting slivers, rovings or strands since the sliver, roving or strand is thick enough or is immediately twisted so there is little problem of the fibres lapping around the front rollers. It is also known to draft card webs. Fibres in a card web are less consolidated and require larger rollers to prevent lapping. Fibres in a card web are also not aligned.
  • Apparatus for the drafting of card webs are restricted to drafting of worsted type long fibres, since it permits the use of relatively large rollers which prevent fibre lapping of rollers whilst having sufficient control of the fibres in drafting.
  • the present invention seeks to alleviate this problem.
  • the present invention provides:
  • the wedge shaped nature of the apron loops proximate to the nip point enables cotton type card web to be drafted, so significantly improving the properties of the drafted web.
  • the arms of at least one of the loops on each side of the nip point are substantially planar.
  • the drafting assembly further comprises a drive assembly for displacing the aprons, the drive assembly being adapted to displace the front aprons more rapidly than the rear aprons so generating a drafting force on the fibres in the web gripped by the front and rear nip points.
  • At least one of the aprons can comprise a planar portion defining a support surface.
  • the loop can be nylon, PVC or rubber, preferably reinforced rubber.
  • the loop can be a composite material.
  • the loop can be polyurethane.
  • the drafting assembly comprises upper and lower rear nip rollers arranged to nip the upper and lower rear aprons between them to create the rear nip point.
  • the drafting assembly could comprise upper and lower rear nip bars arranged to nip the upper and lower rear aprons between them to create the rear nip point.
  • the drafting assembly could also comprise upper and lower front nip rollers arranged to nip the upper and lower front aprons between them to create the front nip point.
  • the drafting assembly could comprise upper and lower front nip bars arranged to nip the upper or lower front spans between them to create the front nip point.
  • the drive assembly can comprise at least one drive roller which abuts an apron and is adapted to displace the apron on rotation of the drive roller.
  • the drive roller can be positioned within the loop.
  • a carding assembly comprising at least one carding roller for creating a fibre web; and a drafting assembly for drafting the fibre web the drafting assembly comprising upper and lower rear apron loops having first and second support surfaces respectively being arranged to grip the fibre web between them and transport the web from a rear entrance to a rear nip point on displacement of the rear aprons; upper and lower front apron loops having third and fourth support surfaces respectively being arranged to grip the fibre web between them and transport the web from a front nip point to an exit on displacement of the front aprons; the front and rear nip points being adjacent and arranged such that the front nip point receives fibre web which exits the rear nip point; characterised in that proximate to the nip point each loop is wedge shaped with the arms of the loop on each side of the nip point converging towards nip point and having an acute angle therebetween.
  • the carding assembly can further comprise consolidating means for partially reducing the width of the web before it is received by the drafting assembly.
  • the carding assembly could also comprise a further consolidating means for receiving the drafted web from the drafting assembly and further reducing its width to a sliver.
  • Short fibres are not conducive to the production of high quality yarns.
  • the yarns are therefore combed to remove these. Combing takes place after carding but before spinning.
  • the fibres need to be aligned before they can be subjected to the combing process. This is done by drafting.
  • FIG. 1 Shown in figures 1 and 2 in schematic form are known as roller drafting assemblies (1).
  • the drafting assembly (1) of figure 1 comprises a pair of front rollers (2) and a pair of rear rollers (3).
  • the front rollers (2) are arranged to rotate more rapidly than the rear rollers (3) so producing a drafting force on the fibres (4) as they move between the two sets of rollers (2, 3).
  • the assembly (1) shown in figure 2 includes a pair of rear aprons (5, 6) for better control of fibres.
  • Roller drafting is typically performed on slivers and rovings or occasionally on card webs. It is known that a large proportion of the fibres in the card sliver or web are hooked as a result of the carding process. Hook free material can lead to better quality of yarn and/or lower the amount of comber waste.
  • the assemblies of figures 1 and 2 are however only suitable for drafting of slivers and rovings. The consolidated nature of slivers and rovings reduces the tendency of the fibres to lap around the rollers.
  • the apparatus of figures 1 and 2 are not suitable for drafting card web fibres. This is because fibres in the web are less consolidated and can lap more easily. If the apparatus of figure 2 were to be used to draft card webs the diameter of the rollers would have to be large to reduce fibre lapping. This would however increase the distance between the nip points to an unacceptable degree.
  • Each of the assemblies comprises upper and lower rear aprons (7, 8).
  • the upper and lower rear aprons (7, 8) each comprise a flexible loop of material (9, 10), typically pvc, nylon, rubber, polyurethane or a composite material.
  • a drive assembly (11, 12) comprising a drive roller (13, 14) which abuts the loop (9, 10). Turning the drive roller (13, 14) turns the loop (9, 10).
  • Each of the aprons (7, 8) includes a planar support portion (15, 16).
  • the two planar support portions (15, 16) are arranged to grip the fibres of a sliver received at an entrance (17) between them.
  • the rear nip point (18) is created by upper and lower rear nip rollers (19, 20) which nip the upper and lower aprons (7, 8) between them.
  • the embodiment of figure 3 does not include a front apron and is generally used for drafting worsted card slivers.
  • the drafting assembly of figure 4 further comprises a front apron (21) in the form of a loop (22) having a shape defined by tensioning means (23).
  • a lower front nip roller (24) is positioned within and abuts against the front apron loop (22).
  • An upper nip roller (25) nips the apron (21) between it and the lower nip roller (24) creating a front nip point (26).
  • the front and rear nip points (26, 18) are arranged such that the fibres which exit the rear nip point (18) are received by the front nip point (26).
  • Such drafting assemblies can be used for sliver drafting or worsted type web drafting. However, again they are not suitable for drafting cotton type card webs as the distance between the nip point is unacceptably large.
  • the reduction in size of one of the front nip point rollers partially reduces the distance between front and rear nip points and is suitable for worsted type card web drafting.
  • the relatively large upper nip rollers (25) in figures 3 and 4 necessary to avoid fibre lapping, places a limit on how close together the front and rear nip point (26, 18) can be. This in turn places a relatively large lower limit on the length of fibre which can be controlled in the drafting process. Fibres below this limit either because of their length or because of their relative orientation or configuration will tend to be uncontrolled.
  • reducing of the size of the upper front drafting roller would result in the fibres from the web lapping around the roller. Because of this such apparatus is not suitable for drafting cotton type card web.
  • Shown in figure 5 is an assembly similar to that of figure 2 .
  • Like reference numerals are used for like parts.
  • Further aprons are arranged around the front rollers. Such a system is disclosed in DE 4141237 .
  • the use of further aprons in such systems is to carry the fibres forward to further rollers in some arrangement that improves yarn quality.
  • Such assemblies are also not suitable for drafting cotton type card webs.
  • the drafting assembly comprises upper and lower rear aprons (27, 28).
  • the drafting assembly further comprises upper and lower front aprons (29, 30) in the form of loops.
  • Associated with each apron (27-30) is a drive assembly within the loop.
  • Each drive assembly comprises a drive roller (32) which abuts against the inside of each respective loop and which drives rotation of the loop.
  • the upper and lower front aprons (29, 30) have third and fourth support surfaces (33, 34) respectively. These are arranged to grip the fibre web received at a front nip point (35) and transport it to an exit point (36).
  • the front nip point (35) is created by upper and lower front nip rollers (37, 38). These nip the upper and lower front aprons (29, 30) between them.
  • the rear nip point is created by upper and lower rear nip rollers.
  • the above drive assembly rotates the upper and lower rear aprons (27, 28) transporting the web from the entrance (39) to the rear nip point (40).
  • the web exits the rear nip point (40) and is received by the front nip point (35). From here it is transported to the exit point (36).
  • the drive rollers (32) rotate the front aprons (29, 30) more rapidly than the rear (27, 28) so producing a drafting action on fibres as they span the gap between the front and rear nip points (35, 40).
  • the aprons close to the nip points are arranged to be wedge shaped with the arms of the apron on each side of a nip roller converging toward the nip roller and having an acute angle between them.
  • the wedge shaped aprons on opposite sides of the nip points face each other. In this embodiment the arms are planar.
  • This wedge shaped arrangement allows the front and rear nip points to be positioned close together.
  • the apparatus according to the invention can use small front rollers.
  • the aprons avoid the problem of fibre lapping.
  • the arrangement of the aprons results in a short distance between the nip points and rollers which are relatively easy to drive.
  • the apparatus can therefore be used to draft shorter fibres under control in webs than known drafting apparatus. This results in a commercially significant improvement in the web with a significant reduction in noil in the subsequent combing process.
  • the carding assembly (41) comprises a carding roller (42) for producing a web which is received by the drafting assembly of figure 6 .
  • a consolidating means (not shown). The consolidating means reduces the width of the web. The web is however still maintained wider and more open than a sliver.
  • the carding assembly comprises a further consolidating means which further consolidates the drafted web as it leaves the drafting assembly.
  • the carding assembly does not include a consolidating means for reducing the width of the web.
  • the nose rollers are replaced by nose bars. This however reduces the drafting speed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Pens And Brushes (AREA)
EP05807866A 2004-11-11 2005-11-10 A drafting assembly and method of drafting a web Not-in-force EP1809795B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0424896A GB2420124A (en) 2004-11-11 2004-11-11 Fibre drafting apparatus
PCT/GB2005/004327 WO2006051294A1 (en) 2004-11-11 2005-11-10 A drafting assembly and method of drafting a web

Publications (2)

Publication Number Publication Date
EP1809795A1 EP1809795A1 (en) 2007-07-25
EP1809795B1 true EP1809795B1 (en) 2008-10-15

Family

ID=33523541

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05807866A Not-in-force EP1809795B1 (en) 2004-11-11 2005-11-10 A drafting assembly and method of drafting a web

Country Status (8)

Country Link
US (1) US20090094793A1 (zh)
EP (1) EP1809795B1 (zh)
CN (1) CN101061266B (zh)
AT (1) ATE411420T1 (zh)
DE (1) DE602005010467D1 (zh)
ES (1) ES2315924T3 (zh)
GB (2) GB2420124A (zh)
WO (1) WO2006051294A1 (zh)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1392408B1 (it) * 2008-12-23 2012-03-02 Texnology S R L Dispositivo di trattamento di un velo di carda
WO2013144748A1 (en) * 2012-03-28 2013-10-03 Lakshmi Machine Works Limited Web drafting assembly of carding machine
IT201900005608A1 (it) * 2019-04-11 2020-10-11 Marzoli Machines Textile Srl Pettinatrice di una linea di preparazione alla filatura
CN111005156B (zh) * 2019-12-19 2021-09-10 瑞安市博安防刺穿材料科技有限公司 一种采用二次拉伸增强非织造无纺布强度的方法

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB719355A (zh) *
US1970528A (en) * 1932-02-29 1934-08-14 Saco Lowell Shops Drawing mechanism for spinning frames and similar machines
NL274230A (zh) * 1960-02-19
GB1120222A (en) * 1964-06-22 1968-07-17 Carding Spec Canada Improvements in or relating to textile carding machines
IT951508B (it) * 1965-01-05 1973-07-10 Bonomi F Gruppo di assorbimento dell ani dride carbonica per l uso negli impianti e nei procedimenti di conservazione della frutta
US3370326A (en) * 1965-09-20 1968-02-27 Fieldcrest Mills Inc Method and apparatus for forming a web of highly parallelized textile fibers
US4070732A (en) * 1974-07-16 1978-01-31 Schlumberger & Cie Textile fibre control system in a drawing device
JPS5668116A (en) * 1979-10-31 1981-06-08 Toray Ind Inc Apron apparatus for fine spinning machine
US4434533A (en) * 1982-02-18 1984-03-06 Nakagawa, Seisakusho Co., Ltd. High draft apparatus for worsted spinning process
BG41936A1 (en) * 1985-05-07 1987-09-15 Bakhov Apparatus for drawing
CN1039632A (zh) * 1988-07-15 1990-02-14 里特机械公司 用于纺纱机的牵伸装置
US4980833A (en) * 1988-07-26 1990-12-25 The University Of Tennessee Research Corporation Airplane take-off monitor with learning feature
US5479680A (en) * 1990-04-06 1996-01-02 Stalder; Herbert Sliver drafting apparatus
DE4141237C2 (de) * 1990-12-17 2002-01-17 Zinser Textilmaschinen Gmbh Doppelriemchenstreckwerk für Ringspinnmaschine
DE4139067C2 (de) * 1991-11-28 1993-11-25 Skf Textilmasch Komponenten Doppelriemchenstreckwerk für Spinnereimaschinen
EP0798408B1 (en) * 1996-03-25 1999-12-22 Howa Machinery Limited Drafting device for fine spinning frame
DE10005387A1 (de) * 2000-02-07 2001-08-09 Stahlecker Fritz Vorrichtung an einer Spinnmaschine zum Verdichten eines Faserverbandes
DE10008130A1 (de) * 2000-02-22 2001-08-23 Stahlecker Fritz Vorrichtung an einer Spinnmaschine zum Verdichten eines Faserverbandes
CN2495663Y (zh) * 2001-07-11 2002-06-19 安玉先 细纱机四皮圈牵伸机构

Also Published As

Publication number Publication date
CN101061266A (zh) 2007-10-24
WO2006051294A1 (en) 2006-05-18
GB2420566B (en) 2008-12-17
DE602005010467D1 (de) 2008-11-27
CN101061266B (zh) 2010-06-16
GB0424896D0 (en) 2004-12-15
ATE411420T1 (de) 2008-10-15
GB2420566A (en) 2006-05-31
GB2420124A (en) 2006-05-17
ES2315924T3 (es) 2009-04-01
US20090094793A1 (en) 2009-04-16
GB0522808D0 (en) 2005-12-14
EP1809795A1 (en) 2007-07-25

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