WO1992009727A1 - Dispositif d'etirage de rubans - Google Patents

Dispositif d'etirage de rubans Download PDF

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Publication number
WO1992009727A1
WO1992009727A1 PCT/CH1991/000238 CH9100238W WO9209727A1 WO 1992009727 A1 WO1992009727 A1 WO 1992009727A1 CH 9100238 W CH9100238 W CH 9100238W WO 9209727 A1 WO9209727 A1 WO 9209727A1
Authority
WO
WIPO (PCT)
Prior art keywords
rollers
roller
rubber
drafting
smooth
Prior art date
Application number
PCT/CH1991/000238
Other languages
German (de)
English (en)
Inventor
Jürg Solenthaler
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 BR919106023A priority Critical patent/BR9106023A/pt
Priority to JP4500008A priority patent/JPH05503328A/ja
Publication of WO1992009727A1 publication Critical patent/WO1992009727A1/fr

Links

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
    • D01H5/70—Constructional features of drafting elements
    • D01H5/74—Rollers or roller bearings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C5/00—Filling or capping teeth
    • A61C5/60—Devices specially adapted for pressing or mixing capping or filling materials, e.g. amalgam presses
    • A61C5/66—Capsules for filling material
    • 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

Definitions

  • the present patent application relates to a belt drafting system with a plurality of top rollers and a plurality of bottom rollers, which include, among other things, a pair of input rollers and a pair of delivery rollers.
  • the bottom rollers are all corrugated so that the roving or the sliver can be dissolved sufficiently.
  • the roving of a flyer has a certain twist, which is dissolved again when stretched.
  • a drafting device for nozzle spinning is now known from EP-A-0361257.
  • This document relates specifically to the delivery rollers of the drafting system, which are designed as continuous, cylindrical surfaces without interruptions. This creates air flows which come together in the nip of the pair of rollers and then pass the nip along the central area against both end areas of the nip line, and on the exit side of the pair of rollers again against the center of the nip line. It is therefore intended that a sufficiently large number of wrapping fibers arise.
  • the center rollers of the drafting system are preferably knurled in order to ensure that the apron is carried along.
  • the design of the input roller is rather indifferent, ie they can be both corrugated and smooth.
  • the object of the invention is therefore to improve a draw frame of the aforementioned type in such a way that the described inadequacies are largely eliminated and a yarn of greater uniformity can be produced.
  • the invention is based on the important finding that the periodic errors and the irregularities in the yarn produced are actually caused by the corrugated lower rollers, in particular the input roller, although this would in no way be expected from the nature of the matter. At this point it should be explicitly mentioned that such periodic errors occur at intervals of The order of magnitude of a few centimeters occurs, the reefing being in the millimeter range.
  • top rollers are provided with a rubber cover and are thus elastically deformable by the contact pressure. This measure ensures a sufficiently large clamping force to stretch the fiber band. This further contributes to the good quality of the yarn. According to claim 3, the pressure of the top rollers can be adjusted. This measure further optimizes the quality of the yarn.
  • the delivery rolls and the center rolls made of steel are of cylindrical smooth design. This measure enables a further increase in quality and greater uniformity of the yarn.
  • the upper rollers can be made entirely of rubber according to claim 5, or can be provided with a rubber cover according to claim 6, the thickness of this rubber cover being large enough to ensure the clamping force between the rollers.
  • the hardness of the rubber rollers, or the cover made of rubber is between 55 ° and 70 ° shore, so that they are in a range from semi-soft to soft.
  • the single figure shows an input roller pair 1 and 2, which consists of a metal roller and a rubber roller 2.
  • a pair of central rollers consisting of a lower metal roller 3 and an upper rubber roller 4, the Rubber rollers 2 and 4 are pressed with resilient elements 13 against the metal rollers and are somewhat deformed in the process.
  • the resilient elements 13 can be formed as helical springs.
  • a pair of delivery rollers a lower steel roller 6 is combined with a rubber delivery roller 7.
  • Step bridge 11 Inside the lower apron 8 there is one Step bridge 11 and inside the top apron 9 a strappy cage 12.
  • a spring element 13 is also attached in this part of the rollers. All resilient elements 13 are fastened together on a drafting arm 14, with which the pressure can be regulated individually or together.
  • the resilient elements 13 can, for example, contain helical springs, wherein the regulation of the pressure can also be carried out in another manner known per se, for example by means of a precisely calibrated screw.
  • the input roller 1 is now cylindrical and smooth, ie there is no corrugation in any way, so that thanks to the slight deformation of the rubber roller 2 there is an elongated, rectangular clamping surface between the input roller pair 1 and 2.
  • the smooth input roller 1 made of steel has a surface roughness Ra of 0.3 to 1.0 mm, preferably around 0.5 mm. It can also have a surface coating made of chrome or plasma-coated ceramic, which have the same roughness. This ensures that the roller still creates sufficient friction with the upper input roller 2 and on the other hand prevents the fibers of the fiber sliver to be drawn from sticking.
  • the other lower rolls 3, 5 and 6 can also have a smooth cylindrical design, although this is not absolutely necessary for optimal stretching. However, if the lower rollers 1, 3 and 6 are all smooth, each can be equipped with a scraping device 10 - of the type an obliquely arranged razor blade - which clean the rollers of pressed dirt parts.
  • All top rollers 2, 4, 5 and 7 are either made entirely of rubber, or are also steel rollers with a rubber cover of about 2 mm to 3 mm in thickness.
  • the hardness of the rubber rollers or their covers is in the range from 55 ° to 70 ° shore. This ensures that the rubber rollers determine a defined clamping surface. This clamping surface is determined by the hardness of the selected rubber or the selected rubber cover and by the set contact pressure by means of the compression spring 13.
  • pre-warping between the roller pairs 1, 2 and 3, 4 in the range from 3 to 10 can be achieved, since the warping forces in a belt that is not or hardly twisted are significantly lower than the warping forces that are necessary for a roving or a Fuse of a flyer. In the latter case the delays are small, i.e. less than about 1.2.
  • the distances between the individual roller pairs of the drafting system have to be determined experimentally and are dependent on the fiber band presented, i.e. from its stack length. With this new belt drafting system it has now been shown that hardly any periodic errors and a much better yarn uniformity are guaranteed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Epidemiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Dentistry (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Abstract

Dans un dispositif d'étirage servant à étirer un ruban de fibres, le cylindre alimentateur inférieur (1) est fabriqué en acier et présente une surface cylindrique pleine et lisse. De cette manière, la qualité du fil est considérablement améliorée et les défauts périodiques dans le fil sont largement évités. Avec un tel dispositif d'étirage, la régularité du fil est considérablement plus grande qu'avec des dispositifs conventionnels.
PCT/CH1991/000238 1990-11-22 1991-11-22 Dispositif d'etirage de rubans WO1992009727A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BR919106023A BR9106023A (pt) 1990-11-22 1991-11-22 Trem de estiragem de mechas
JP4500008A JPH05503328A (ja) 1990-11-22 1991-11-22 スライバドラフト機構

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3699/90A CH682753A5 (de) 1990-11-22 1990-11-22 Bandstreckwerk.
CH3699/90-3 1990-11-22

Publications (1)

Publication Number Publication Date
WO1992009727A1 true WO1992009727A1 (fr) 1992-06-11

Family

ID=4261625

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1991/000238 WO1992009727A1 (fr) 1990-11-22 1991-11-22 Dispositif d'etirage de rubans

Country Status (5)

Country Link
EP (1) EP0512092A1 (fr)
JP (1) JPH05503328A (fr)
BR (1) BR9106023A (fr)
CH (1) CH682753A5 (fr)
WO (1) WO1992009727A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008040951A1 (de) * 2008-08-01 2010-02-04 Rieter Ingolstadt Gmbh Abzugswalze zum Abziehen eines gesponnenen Fadens und Textilmaschine mit einer Abzugswalze

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005006273A1 (de) * 2004-04-21 2005-11-10 Trützschler GmbH & Co KG Vorrichtung zum Verfestigen eines förderbaren Faservlieses, z. B. aus Baumwolle, Chemiefasern o. dgl.

Citations (4)

* 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
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
US3748694A (en) * 1971-11-03 1973-07-31 Schaeffler Ohg Industriewerk Drafting system having a supporting roll for offset top feed roll
EP0361257A1 (fr) * 1988-09-29 1990-04-04 Maschinenfabrik Rieter Ag Rouleaux d'alimentation dans un train d'étirage

Patent Citations (4)

* 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
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
US3748694A (en) * 1971-11-03 1973-07-31 Schaeffler Ohg Industriewerk Drafting system having a supporting roll for offset top feed roll
EP0361257A1 (fr) * 1988-09-29 1990-04-04 Maschinenfabrik Rieter Ag Rouleaux d'alimentation dans un train d'étirage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008040951A1 (de) * 2008-08-01 2010-02-04 Rieter Ingolstadt Gmbh Abzugswalze zum Abziehen eines gesponnenen Fadens und Textilmaschine mit einer Abzugswalze

Also Published As

Publication number Publication date
CH682753A5 (de) 1993-11-15
EP0512092A1 (fr) 1992-11-11
BR9106023A (pt) 1993-01-19
JPH05503328A (ja) 1993-06-03

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