EP0420348A2 - Dispositif pour la production de mèche dans un système d'étirage finisseur - Google Patents

Dispositif pour la production de mèche dans un système d'étirage finisseur Download PDF

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Publication number
EP0420348A2
EP0420348A2 EP90202539A EP90202539A EP0420348A2 EP 0420348 A2 EP0420348 A2 EP 0420348A2 EP 90202539 A EP90202539 A EP 90202539A EP 90202539 A EP90202539 A EP 90202539A EP 0420348 A2 EP0420348 A2 EP 0420348A2
Authority
EP
European Patent Office
Prior art keywords
fibres
bundle
roving
slide duct
ring
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Withdrawn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
EP90202539A
Other languages
German (de)
English (en)
Other versions
EP0420348A3 (en
Inventor
Sandro Sartoni
Eraldo Minguzzi
Oscar Quarantini
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.)
Savio SpA
Savio Macchine Tessili SpA
Original Assignee
Savio SpA
Savio Macchine Tessili SpA
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 Savio SpA, Savio Macchine Tessili SpA filed Critical Savio SpA
Publication of EP0420348A2 publication Critical patent/EP0420348A2/fr
Publication of EP0420348A3 publication Critical patent/EP0420348A3/en
Withdrawn legal-status Critical Current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
    • D01H5/70—Constructional features of drafting elements
    • D01H5/72—Fibre-condensing guides

Definitions

  • This invention relates to a device for compacting a flat bundle of fibres into a roving at the delivery side of the drafting assembly of a horizontally extending finisher which operates like a machine adapted for the final passage of the spinning preparatory processes, assembling the roving into a package in order to form a cop used in feeding the ring spinning machine.
  • a finisher produces a roving consisting of a bundle of discontinuous fibres, which must be of such a consistency that it can withstand the subsequent spinning operation without undergoing false drafts or irregularity of cross section, much less interruptions to the feed of the ring spinning spindles.
  • the bundle of fibres emerging from the drafting assembly is given a consistency of this kind by means of a rubbing action imparted by pairs of rubbing aprons of a known design.
  • the said rubbing aprons are arranged one at the top and one at the bottom and each rubbing apron is mounted rotatably on rollers, which impart the rate of feed of the bundle of fibres by their rotation and are also capable of a crosswise reciprocating motion, so that the said bundle of fibres passing through the centre of the said rubbing aprons winds around itself first to the right and then to the left, so as to produce a roving of compact fibres, as has been well known to the expert for some time.
  • the roving of fibres passing between the external surfaces of the lower and upper aprons acquires a certain consistency, this being sufficient if it receives an average of from 8 to 10 strokes per linear metre from the rubbing aprons.
  • the general trend is to improve the productivity of the machine, increasing the rate of collection of the roving of fibres on the cop.
  • the rubbing aprons are concerned, this trend involves several disadvantages, in that when the rate of collection of the roving of fibres exceeds a certain value, the reciprocating motion of the rubbing aprons reaches too high a frequency, unacceptable for the mechanical resistance of the said rubbing assembly. In fact, the considerable loads in reciprocating motion, if moved at the required rubbing frequency, would give rise to inadmissible stresses on the whole assembly.
  • the object of this invention is to obviate these disadvantages, and so to increase considerably the productivity of the finisher without mechanical limits.
  • This particular invention moreover proposes a device adapted to form the roving of fibres in a simple, easy and economical manner and also proposes a device which, as a whole, occupies less floor space. This latter characteristic allows for easy access to the relevant parts for all inspection and maintenance operations by service engineers.
  • the device of this invention comprises: - in its front part, a condensing slot converging in the direction of movement of the bundle of fibres and said slot ends with a semi-circular profile, from which extends a spindle, around which the bundle of fibres winds and wraps itself so that it assumes a substantially circular shape.
  • the said spindle around which the bundle of fibres winds, extends longitudinally inside the slide duct for the fibres and in its front part is in the shape of a flattened truncated cone which is connected, gradually tapering towards the front, to a final cylindrical pin, around which the fibre band winds, assuming a circular shape.
  • the said flattened part of the front truncated portion is advantageously a flat surface portion which is a continuation of the flat portion of the profile of the condensing slot and which is, however, substantially tangential with respect to the final cylindrical pin.
  • the said air injection nozzles disposed in the central part inject air into the slide duct for the fibres in a very sloping direction in the feed direction of the ring of fibres and in the substantially tangential direction with respect to the axis of the said slide duct.
  • the said air injection nozzles disposed in the end part also inject air into the slide duct for the fibres in a slightly sloping direction in the feed direction of the roving of fibres and in the substantially radial direction with respect to the axis of the said slide duct.
  • the devices and works of the finisher, as a spinning preparation machine which operates in mutual cooperation with the device of this invention, are not illustrated and the operation thereof is not described, as these are already known, and also as they are not relevant to the operation of this invention.
  • the drafting assembly is not illustrated in its entirety, and the driving means of the various drive shafts of the said drafting assembly and the collecting assembly disposed after the device of the invention are not shown.
  • 1 designates the bundle of fibres emerging from the drafting assembly 10 having a supporting structure 7.
  • 19 designates the arrow indicating the direction of feed and movement of the bundle of fibres 1 and of the roving 6.
  • 9 designates any fixed eyelet for guiding the roving 6.
  • 2 designates the device of this invention disposed at the delivery side and thus after the drafting assembly 10 and before the assembly for collecting the roving 6 on the cop.
  • 3 designates the disc having a condensing slot 20 for the bundle of fibres 1.
  • the said slot 20 starts with a profile of a substantially rectangular shape and ends, gradually tapering, with a substantially semi-circular profile.
  • a longitudinal spindle having a cylindrical portion 22 and a truncated portion 30 is rigidly connected to the disc 3 so that they form one unit.
  • This latter portion is advantageously connected, by means of its flat surface portion 30a, to the flat portion of the semi-­circular end profile of the condensing slot 20.
  • the element formed by uniting the said disc 3 and the said spindle is firmly connected by screw means or similar means to the cylindrical element 4.
  • the disc 3 also acts as a closure and sealing element for the air injected in the direction of the arrow 23 into the cylinder 4 in order to pass into the oblique openings 24.
  • 4 designates the central cylindrical element of the device 2 of this invention.
  • the said cylindrical element 4 has a central opening in the shape of a truncated cone in the front portion and of cylindrical shape in the end portion 28.
  • the said front cylindrical portion 27 has a diameter greater than the diameter of the cylindrical portion 22 of the said spindle.
  • the said truncated portion 27 has a width greater than the truncated portion 30 of the said spindle.
  • the said cylindrical element 4 moreover comprises, in its interior, a series of oblique openings with respect to the longitudinal axis of its central opening for injecting air into the cylindrical duct 28.
  • the oblique openings 24 are at the front of the cylindrical duct 28 and are distributed in a substantially equidistant manner along the circumference.
  • the oblique openings 26 are in the vicinity of the end part of the cylindrical duct 28 and are also distributed in an equidistant manner along the circumference.
  • 5 designates the flange firmly connected by screw means or similar means to the cylindrical element 4 in the end part of the device 2 of this invention.
  • the function of the said end flange 5 is to act as a closure and sealing element for the air injected into the cylinder 4, the direction of which is indicated by the arrow 25, in order to pass into the oblique openings.
  • 1a, 1b, 1c, 1d and 1f represent in diagrammatic form (see Fig. 4) the progressive sequence of shapes assumed by the flat bundle of fibres 1 along the truncated portion 27 of the cylindrical element 4.
  • the bundle of fibres 1 in fact gradually winds itself in increasingly circular shapes around the truncated portion 30 of the spindle made integral with the disc 3. This gradual winding takes place in the circular space existing between the truncated outer surface 27 of the central opening of the cylindrical element 4 and the truncated portion 30 of the said spindle.
  • the circular space is substantially in the form of a channel in the shape of a circular crown with a decreasing diameter.
  • 6f, 6d, 6c, 6b and 6a represent in diagrammatic form the progressive sequence of circular shapes of the bundle of fibres winding itself around the cylindrical portion 22 of the said spindle (see Fig. 4) before emerging from the device 2 in the form of a compact roving 19 suitable for being assembled on the cop being formed.
  • 21 designates the supporting and retaining plate of the device 2.
  • 8 designates an element of substantially spiral shape already known in the art, and it helps to reinforce the roving, imparting a slight false twist thereto before assembling it on the cop being formed.
  • the said element 8 is made integral with the translational element 12.
  • 12 designates the element 19 for guiding the roving, fixed as one unit to the shaft 11 which moves in a periodic reciprocating motion, by means already known in the art.
  • 16 designates the fluted cylinder fitted flush to the drive shaft 14, and the said cylinder 16 rotates the cop being formed on the tube 18 disposed between the retaining and supporting brackets 15.
  • the bundle of fibres 1 emerging from the drafting assembly 10 is advanced with the support of guide elements (not shown) to the mouth of the condensing slot 20, which compacts the bundle of fibres from a flat shape into a semi-circular shape.
  • the said semi-­circular form, moved in the direction 19, begins to wind itself gradually around the spindle having a truncated front portion 30 and a cylindrical end portion 22.
  • the progressive shapes 1a, 1b, 1c, 1d and 1f are effected without false draft by the presence of the portion in the shape of a flattened truncated cone 30 which is completely connected to the flat portion of the semi-circular profile of the end part of the condensing slot 20 (see Fig. 3).
  • the compressed air injected into the openings provided in the disc 3 and in the cylinder 4 in the direction of the arrows 24 and 23 moves tangentially at a comparatively high speed into the slide duct 28 for the bundle of fibres, contributing substantially to the feed of the ring of fibres coming from the winding of the cylindrical portion 22 of the spindle.
  • the injection of air into the duct 28, through the oblique openings 24 and 26, in fact helps, by means of its axial component, to drive the bundle of fibres in the feed direction 19, and thus to cross the device 2, and thus also, by means of its radial component, helps to compact the ring of fibres 6f, 6d, 6c, 6b and 6a into a compact roving 6 suitable for winding itself around the tube 18 for the formation of a roving cop used in the subsequent spinning operation.
EP19900202539 1989-09-29 1990-09-25 Device for obtaining the roving in a finisher Withdrawn EP0420348A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8921900A IT1231131B (it) 1989-09-29 1989-09-29 Dispositivo per ottenere lo stoppino in un finitore.
IT2190089 1989-09-29

Publications (2)

Publication Number Publication Date
EP0420348A2 true EP0420348A2 (fr) 1991-04-03
EP0420348A3 EP0420348A3 (en) 1991-08-28

Family

ID=11188450

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900202539 Withdrawn EP0420348A3 (en) 1989-09-29 1990-09-25 Device for obtaining the roving in a finisher

Country Status (2)

Country Link
EP (1) EP0420348A3 (fr)
IT (1) IT1231131B (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH386892A (de) * 1960-02-29 1965-01-15 Murray Keeler Lawrence Spinnverfahren für Stapelfasern und Einrichtung zur Durchführung dieses Verfahrens
GB2059474A (en) * 1979-09-28 1981-04-23 Alsacienne Constr Meca Fibre sheet feeding apparatus
FR2597119A1 (fr) * 1986-04-10 1987-10-16 Zinser Textilmaschinen Gmbh Conduit de guidage de ruban entre cylindres de sortie et cylindres de calandre dans une machine de preparation de filature
FR2598723A1 (fr) * 1986-05-14 1987-11-20 Seydel Spinnereimasch Procede et appareillage pour entremeler les rubans de fibres
EP0261330A1 (fr) * 1986-09-22 1988-03-30 Hollingsworth Gmbh Appareil pour comprimer et pour l'enfilage automatique d'une mèche de fibres textiles dans une fente de transport

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH386892A (de) * 1960-02-29 1965-01-15 Murray Keeler Lawrence Spinnverfahren für Stapelfasern und Einrichtung zur Durchführung dieses Verfahrens
GB2059474A (en) * 1979-09-28 1981-04-23 Alsacienne Constr Meca Fibre sheet feeding apparatus
FR2597119A1 (fr) * 1986-04-10 1987-10-16 Zinser Textilmaschinen Gmbh Conduit de guidage de ruban entre cylindres de sortie et cylindres de calandre dans une machine de preparation de filature
FR2598723A1 (fr) * 1986-05-14 1987-11-20 Seydel Spinnereimasch Procede et appareillage pour entremeler les rubans de fibres
EP0261330A1 (fr) * 1986-09-22 1988-03-30 Hollingsworth Gmbh Appareil pour comprimer et pour l'enfilage automatique d'une mèche de fibres textiles dans une fente de transport

Also Published As

Publication number Publication date
EP0420348A3 (en) 1991-08-28
IT1231131B (it) 1991-11-18
IT8921900A0 (it) 1989-09-29

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