EP0361257A1 - Rouleaux d'alimentation dans un train d'étirage - Google Patents

Rouleaux d'alimentation dans un train d'étirage Download PDF

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Publication number
EP0361257A1
EP0361257A1 EP89117211A EP89117211A EP0361257A1 EP 0361257 A1 EP0361257 A1 EP 0361257A1 EP 89117211 A EP89117211 A EP 89117211A EP 89117211 A EP89117211 A EP 89117211A EP 0361257 A1 EP0361257 A1 EP 0361257A1
Authority
EP
European Patent Office
Prior art keywords
rollers
fibers
pair
drafting system
delivery
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Withdrawn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
EP89117211A
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German (de)
English (en)
Inventor
Herbert Dr. Stalder
Emil Briner
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
Publication of EP0361257A1 publication Critical patent/EP0361257A1/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Withdrawn legal-status Critical Current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
    • D01H5/22—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
    • D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
    • D01H1/11—Spinning by false-twisting
    • D01H1/115—Spinning by false-twisting using pneumatic means

Definitions

  • This invention relates to the pair of delivery rollers (also called output roller pair or outlet roller pair) of a drafting device for false twist spinning, in particular nozzle spinning.
  • the delivery roller pair of a drafting system must meet particularly strict requirements.
  • the rollers of this pair must rotate with the highest number of revolutions of all rollers of the drafting arrangement.
  • the clamping line formed by the rollers defines a limit of the last draft field in the entire drafting system which determines the main draft.
  • this pair of rollers delivers the fibers to be spun into the so-called spinning triangle, where they are twisted together.
  • the conditions around this pair of rollers have a decisive influence on the yarn quality.
  • This pair of rollers is also attached to the fibers exposed to the rollers, which can lead to so-called winding.
  • the normal corrugated delivery cylinder allows a certain amount of air to pass from the inlet to the outlet side of the pair of delivery rollers. But this is not enough to bring up the desired effect.
  • the drafting system plays a particularly important role in false twist (especially nozzles) spinning because it not only has to refine the sliver, but also split it up in order to provide the so-called wrapping fibers.
  • the wrapping fibers are often also referred to as "edge fibers", it being assumed that the fibers in the central region of the clamping line get into the core of the yarn, the fibers outside this "core zone” form the wrapping fibers.
  • a method based on this theory can be found e.g. in U.S. Patent 4,598,537, where air currents on the input side of the pair of delivery rollers are used to produce edge fibers.
  • wrapping fibers can arise both from the "core zone" of the spinning triangle and from the edge areas. It has even been shown that the wrapping fibers emerging from the core zone attach themselves better to the yarn core than the edge fibers and are therefore better able to contribute to the yarn strength. The production of wrapping fibers in the middle of the spinning triangle must therefore be promoted by all means.
  • a drafting system is characterized in that the pair of delivery rollers for deflecting fibers is formed and / or operated from the conveying plane.
  • the conveyor level is a level that includes a straight extension of the main fiber flow from the pair of delivery rollers.
  • the pair of delivery rollers comprises a first roller made of metal and a second roller made of a relatively elastic material.
  • the two rollers are in contact with one another to form a clamping line of a predetermined length.
  • the length of this clamping line is determined by the axial length of the elastic roller.
  • the surfaces of the rollers that are in contact with one another are continuous cylindrical surfaces, ie without cuts, recesses or other interruptions of any kind. In particular, these mutually contacting outer surfaces of the rollers through no air passage channels (according to US 4,718,225 and / or US 3,487,619), corrugation (e.g. according to US 2,199,842) or incisions containing fibers (eg according to US 3,090, 081 and / or 3,296,664) interrupted. Such surfaces are referred to as "smooth" surfaces in the following description.
  • the elastic material of the second roller preferably has a Shore hardness in the range from 60 to 70, a hardness of approximately 65 Shore being preferred.
  • This material can be made of rubber as well as a synthetic material (elastomer).
  • the axial length of this roller, which determines the length of the clamping line, can be in the range 28 to 32 mm, preferably 30 mm.
  • the second roller could be formed as a smooth roller made of metal, but would not then have the same deflecting effect.
  • the hardness of the material can, however, be partially compensated for by increasing the pressure pressing the rollers.
  • the drafting system is designed for use in a false twist spinning machine with a relatively high delivery speed (above 150 m / min).
  • the drive of the pair of delivery rollers must be formed accordingly, such drive systems are already known.
  • such a drafting arrangement should work together with a suction nozzle in such a way that the suction nozzle sucks in the wrapping fibers supplied by the drafting arrangement and leads to the wrongly twisted yarn core.
  • This nozzle can itself cause the false twist in the yarn core or can work together with another false twist element, for example another nozzle or a mechanical twister.
  • the suction nozzle is arranged opposite the drafting system and generates such an air stream (e.g. an air stream at such a high speed) that it leads the fibers deflected by the pair of delivery rollers back to the main fiber stream as wrapping fibers.
  • an air stream e.g. an air stream at such a high speed
  • the drafting system shown in FIG. 1 comprises an input roller pair EP, a middle roller pair MP, and a delivery roller pair LP.
  • Each pair of rollers includes a first driven roller made of metal and a second roller (pressure roller) made of rubber.
  • Each printing roller DW is printed by a carrier system, not shown, against its respective metal roller MW, so that the rollers of the delivery pair LP meet one another along a clamping line Touch KL (Fig. 2 + 3).
  • the arrangement of the input roller pair is the same.
  • the rollers of the middle pair MP each have an apron R1, R2 to improve the fiber guidance in the main draft zone between the middle roller pair MP and the delivery roller pair LP. This arrangement is well known and will therefore not be described in more detail here. It is also not essential to this invention.
  • the invention could be used in combination with a so-called KEPA drafting system, e.g. in a drafting system according to our Swiss patent application No. 2723/88.
  • the pre-drafting field between the input roller pair EP and the middle roller pair MP can be carried out with or without a push rod according to our Swiss patent application No. 3260/88.
  • the invention is also not limited to the 2-zone drafting arrangement shown, but can also be used in drafting systems with three or more draft fields.
  • the metal roller MW of the middle roller pair MP is preferably capped in order to ensure that the strap R2 is carried along.
  • the metal roller of the input roller pair EP can be corrugated or can be smooth e.g. according to US Pat. No. 2,244,461 or US Pat. No. 2,199,842.
  • the invention relates to the design and operation of the delivery roller pair LP and the following description therefore focuses on this pair and the elements following it.
  • an overall arrangement according to FIG. 1 is assumed, so that the fiber stream supplied by the drafting system flows from left to right in all figures and, accordingly, each metal roller MW around its own Axis clockwise and each printing roller DW rotates counterclockwise about its own longitudinal axis.
  • the delivery speed can reach relatively high values, e.g. up to 300 m per minute (for comparison, the drafting system of a conventional ring spinning machine works with a delivery speed of up to approx. 25 m per minute).
  • the fiber material flows through the drafting system in the form of a fiber stream FS. This current lies in a plane which is determined by the clamping lines of the roller pairs and the current leaves the delivery roller pair in the same plane.
  • the high speed generates on the input side of the delivery roller pair LP air flows adhering to the surfaces of the rollers LS1 (FIG. 1), which come together in the nip of the roller pair and then flow along the nip line KL from the central region against both end regions of the nip line (FIG. 2) .
  • air flows LS2 (FIG. 2) flow from both end regions against the center of the clamping line, where they are carried along by the roller surfaces (FIG. 1).
  • the air passage channels according to US Pat. No. 4,718,225 and US Pat. No. 3,487,619 and the "shielding effects" of the straps R1 and R2 according to EP PS 107 828 have been provided in the prior art.
  • the mutually contacting lateral surfaces MF (FIG. 3) of the pressure rollers DW and metal roller MW are in the Delivery roller pair LP both continuous (uninterrupted) cylindrical surfaces with an axial length L, which corresponds to the axial length of the pressure roller DW.
  • the axial length of the metal roller of this pair of rollers can either be equal to the length L of the pressure roller DW (shown in dashed lines in FIG. 3) or longer than the axial length of the pressure roller (shown in solid lines in FIG. 3).
  • the metal roller MW can either be assigned a single spinning position of the spinning machine, not shown, or it can extend over several such spinning positions (if need be, over an entire machine side).
  • the metal roller MW is normally made of steel and can be polished in the area MF contacting the pressure roller DW in accordance with US Pat. No. 2,199,842 or sandblasted or plasma-coated in accordance with US Pat. No. 2,244,461 or treated in some other way.
  • the pressure roller DW comprises a support body TK (only shown schematically in FIG. 3) and a cover UZ made of rubber or another elastomeric material which is applied to this support body.
  • This coating has a Shore hardness in the range 60 to 70, preferably approximately 65.
  • the length L of the pressure roller DW is in the range 28 to 32 mm, preferably 30 mm.
  • This design of the rollers in the delivery roller pair LP favors air flows LS1 and LS2 in the circumferential directions of the two delivery rollers by the rotation of these rollers.
  • the air flows LS1 (Fig. 2) spread fibers from the edges of the fuse, which is conducive to the formation of the aforementioned "edge fibers".
  • edge fibers are also for that False twist spiders are useful, but are not the primary objective of this invention.
  • the design of the rollers in the pair of delivery rollers LP acts on the fibers supplied by the drafting system in such a way that a smaller number of fibers in relation to the total fiber quantity are deflected in the circumferential directions of the delivery rollers, even within the actual spinning triangle.
  • the above-mentioned effect is also achieved by the adhesive effect between the fibers and the rollers of the pair of delivery rollers.
  • This adhesive effect is favored by the use of a relatively soft material for the roller coating. It can also be supported by a relatively high pressure applied to the platen. This pressure can be selected in relation to the hardness of the cover so that the cover is slightly deformed on the harder lower cylinder, which also favors the desired effect. With a very high pressure this result could even be achieved between two metal rollers.
  • Fig. 4 shows the delivery roller pair LP in combination with a single spinneret SD, e.g. according to EP 121 602 or DE-PS 33 01 652.
  • a nozzle has an opening M which is relatively wide in the circumferential direction of the rollers DW and MW and sucks air A from the environment into this opening.
  • a fiber deflected by the air flows LS2 (FIG. 1) or the adhesive effect is therefore redirected again by the opposite air flows A and guided back into the channel K of the suction nozzle SD.
  • the yarn core not shown
  • the invention enables the "three-dimensional” (3-D) production of the wrapping fibers in contrast to the two-dimensional production (US Pat. No. 4,598,537) by using the "edge fibers" alone.
  • This advantageous “3-D” effect is achieved in that various properties, which are normally undesirable, of a pair of delivery rollers are combined to produce advantageous fiber movements and are used in combination with a subsequent suction system.
  • nozzle D which nozzle does not work alone as a spinneret, but prepares the fibers for a further false twist element (not shown).
  • a suction nozzle D which nozzle does not work alone as a spinneret, but prepares the fibers for a further false twist element (not shown).
  • a nozzle is known from US Pat. No. 4,457,130 or from DE-PS 3,437,343.
  • this nozzle D is not in the circumferential directions of the Rolls has wide opening, it also generates air flows A by suction behavior, which counteract the air flows LS2 (Fig. 1) or the adhesive effect and reinsert the deflected fibers into the suction channel SK of the nozzle D.
  • the air flows LS2 and the adhesive effect work in such a way that additional fibers are released from the yarn core and are later articulated to the yarn core again as wrapping fibers.
  • Such wrapping fibers can arise both from the edge regions at the outer ends of the clamping line and in the central region of the clamping line, the latter fibers being particularly desirable, as was already explained in the introduction to this description.
  • the invention is particularly advantageous when spinning coarser yarns using the nozzle method, since it is particularly difficult in connection with such yarns to produce a sufficient number of wrapping fibers.
  • one strap in Fig. 1 strap R2 may extend closer to the pair of delivery rollers LP than the other strap (in Fig. 1 strap R1).
  • a conventional apron guide for example according to US Pat. No. 3,296,664.
  • the straps R1 and R2 are preferably considerably wider than the intermediate fiber stream, so that the movement of the driven straps (in Fig. 1 of the straps R2) is transferred by touching between the straps themselves on the upper straps (in Fig. 1 to the straps R2).
  • the smooth rollers preferably have a certain surface roughness, which e.g. can be generated by hard chrome plating, plasma coating or similar processes. This roughness must under no circumstances allow an air passage effect (cf. the conventional bordering), but can give the surfaces an "orange peel character".
  • the pressure or the hardness of the pressure roller in the pair of delivery rollers has an influence on the spinning tension after the spinneret.
  • the spinning tension can be increased for a given spinning speed. This enables a higher spinning speed with the same strength, since the yarn strength is dependent on the spinning tension in such a way that a maximum strength is obtained at a certain spinning tension and the spinning tension decreases with increasing spinning speed.
  • the increase in the number of wrapping fibers causes more friction of these fibers on the nozzle entrance, forcing the trigger system to generate a higher trigger force and thereby a higher spinning tension.
  • the invention is not limited to this explanation of the phenomenon.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP89117211A 1988-09-29 1989-09-18 Rouleaux d'alimentation dans un train d'étirage Withdrawn EP0361257A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH362388 1988-09-29
CH3623/88 1988-09-29

Publications (1)

Publication Number Publication Date
EP0361257A1 true EP0361257A1 (fr) 1990-04-04

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EP89117211A Withdrawn EP0361257A1 (fr) 1988-09-29 1989-09-18 Rouleaux d'alimentation dans un train d'étirage

Country Status (3)

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US (1) US5038553A (fr)
EP (1) EP0361257A1 (fr)
JP (1) JPH02118126A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992009727A1 (fr) * 1990-11-22 1992-06-11 Maschinenfabrik Rieter Ag Dispositif d'etirage de rubans
WO2002070797A1 (fr) * 2001-03-02 2002-09-12 Yamauchi Corporation Rouleau en caoutchouc pour textiles

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH685123A5 (de) * 1991-11-21 1995-03-31 Rieter Ag Maschf Streckwerk für eine Feinspinnmaschine, insbesondere Düsenspinnmaschine.
US5970700A (en) * 1997-04-18 1999-10-26 Wellman, Inc. Drafting apparatus and method for producing yarns
US5950413A (en) * 1997-04-18 1999-09-14 Wellman, Inc. Spinning apparatus, method of producing yarns, and resulting yarns
US20050201786A1 (en) * 2003-11-27 2005-09-15 Takuya Ito Sheet processing apparatus, automatic document feeder and image forming apparatus
JP4833641B2 (ja) * 2005-11-21 2011-12-07 ヤマウチ株式会社 紡績用ローラー

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2199842A (en) * 1938-04-11 1940-05-07 Whitin Machine Works Drawing mechanism
GB1041854A (en) * 1962-04-19 1966-09-07 Zinser Textilmaschinen Gmbh Apparatus for removing impurities from drafted fibre webs
DE3128870A1 (de) * 1981-07-22 1983-02-10 Fritjof Dipl.-Ing. Dr.-Ing. 6233 Kelkheim Maag Streckwerk fuer das verziehen von spinnfaserbaendern
DE3236971A1 (de) * 1981-10-07 1983-04-28 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho, Kariya, Aichi Wirbelduese zum einwirken auf ein faserbuendel
DE3248390A1 (de) * 1981-12-29 1983-07-28 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho, Kariya, Aichi Luftwirbelduese zum spinnen eines faserbuendelgarnes
DE3437343A1 (de) * 1983-10-14 1985-05-02 Murata Kikai K.K., Kyoto Verfahren und vorrichtung zur herstellung eines gesponnenen fadens
DE3345170A1 (de) * 1982-05-05 1985-06-27 Elitex, koncern textilního strojírenství, Reichenberg/Liberec Verfahren und vorrichtung zur herstellung von seelengarn aus einem faserbaendchen
US4718225A (en) * 1985-06-27 1988-01-12 Murata Kaiki Kabushiki Kaisha Pneumatic spinning machine

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3070848A (en) * 1963-01-01 Konig
NL44674C (fr) * 1935-11-15 1900-01-01
US3027603A (en) * 1955-08-22 1962-04-03 Armstrong Cork Co Textile fiber drafting element
BE566801A (fr) * 1957-04-29
US3078519A (en) * 1959-10-08 1963-02-26 Pirelli Elastic draft pressure roller for spinning machines
JPS5853091B2 (ja) * 1978-07-10 1983-11-26 東レ株式会社 多色糸およびその製造方法
DE3148940A1 (de) * 1981-12-10 1983-06-23 Fritz 7347 Bad Überkingen Stahlecker Verfahren zum herstellen eines umwindegarnes, das umwindegarn und eine vorrichtung zum durchfuehren des verfahrens
IN161355B (fr) * 1983-07-01 1987-11-14 Rieter Ag Maschf
US4823545A (en) * 1987-08-31 1989-04-25 Maschinenfabrik Rieter Ag Method of and apparatus for false-twist spinning

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2199842A (en) * 1938-04-11 1940-05-07 Whitin Machine Works Drawing mechanism
GB1041854A (en) * 1962-04-19 1966-09-07 Zinser Textilmaschinen Gmbh Apparatus for removing impurities from drafted fibre webs
DE3128870A1 (de) * 1981-07-22 1983-02-10 Fritjof Dipl.-Ing. Dr.-Ing. 6233 Kelkheim Maag Streckwerk fuer das verziehen von spinnfaserbaendern
DE3236971A1 (de) * 1981-10-07 1983-04-28 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho, Kariya, Aichi Wirbelduese zum einwirken auf ein faserbuendel
DE3248390A1 (de) * 1981-12-29 1983-07-28 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho, Kariya, Aichi Luftwirbelduese zum spinnen eines faserbuendelgarnes
DE3345170A1 (de) * 1982-05-05 1985-06-27 Elitex, koncern textilního strojírenství, Reichenberg/Liberec Verfahren und vorrichtung zur herstellung von seelengarn aus einem faserbaendchen
DE3437343A1 (de) * 1983-10-14 1985-05-02 Murata Kikai K.K., Kyoto Verfahren und vorrichtung zur herstellung eines gesponnenen fadens
US4718225A (en) * 1985-06-27 1988-01-12 Murata Kaiki Kabushiki Kaisha Pneumatic spinning machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992009727A1 (fr) * 1990-11-22 1992-06-11 Maschinenfabrik Rieter Ag Dispositif d'etirage de rubans
WO2002070797A1 (fr) * 2001-03-02 2002-09-12 Yamauchi Corporation Rouleau en caoutchouc pour textiles

Also Published As

Publication number Publication date
US5038553A (en) 1991-08-13
JPH02118126A (ja) 1990-05-02

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