FR2560228A1 - DEVICE FOR OBTAINING A FIBER FILE - Google Patents

Abstract

PROCESS FOR OBTAINING A THREAD OF FIBERS ACCORDING TO THE TECHNIQUE CALLED "WITH FREE FIBERS" ACCORDING TO WHICH THE FIBERS FROM A FOOD TAPE 3 ARE DISTRIBUTED INSIDE A ROTOR 5 BY MEANS OF A BREAKER 4 AND ARE PLACED BY THE CENTRIFUGAL FORCE INSIDE THE DIT ROTOR 5 SO AS TO FORM A THREAD WHICH IS EXTRACTED BY A DUCT 6 ARRANGED IN THE AXIS OF THE DIT ROTOR. IN THIS PROCESS, A FALSE TORSION IS COMMUNICATED TO THE THREAD SHAPED AT THE EXIT OF ROTOR 5, THIS FALSE TORSION BEING GIVEN BY A PIN 8 SPACED FROM ROTOR 5, PIN WHICH COMMUNICATES AN ADDITIONAL TORSION IN THE SAME DIRECTION AS THAT GIVEN BY THE ROTOR.

Description

- 1 ---

  DEVICE FOR OBTAINING A FIBER FILE.

  The present invention relates to a device

  putting obtaining a yarn of fibers.

  It relates more particularly to a perfection-

  provided to the spinning technique designated by

the expression "open-end technique".

  Generally speaking, according to this open-

  end, the yarn is obtained directly from a ribbon of fibers by means of an assembly (breaker and rotor) which provides the three essential functions necessary for

  obtaining a yarn of fibers, namely drawing-

  ribbon refinement, fiber parallelization and twisting. Such a rotor (also called turbine) is in the form of a hollow enclosure, having substantially the shape of two truncated cones joined by their large

  bases and which is rotated at high speed.

  The fibers of the food tape are distributed internally.

  tior of this rotor by means of a breaker. The fibers are pressed by centrifugal force inside the rotor and form a ring which is extracted in the form

  a yarn whose twist is given by the rotor itself

  even. Extraction of the yarn can be done both by a conduit disposed in the axis of the rotor as by the very axis of drive of said rotor, this axis being well

heard, in this case, hollow.

  Although this technique is widely used

  due to date, it still has a certain number of drawbacks among which we can cite:

  - a speed of production of the yarn which, currently-

  lies, levels off and hardly seems to be able to be increased

  simply lied; - the fact that it is practically impossible to work fibers of different lengths and / or

variables.

  -2- Various solutions have been proposed to overcome these drawbacks, but it should be noted that at this

  to date, none have found true industrial development.

  triel. Among these solutions, that which is the subject of, -the

  French patent application no. 2 360 695 in the name of the Applicant

  deur allows, to a certain extent, to solve these problems but presents, as disadvantage to lead a relatively complex unit, delicate to put in

artwork.

  In general, the technique described in this patent is characterized by the use of a specially shaped rotary chamber, playing the role of the rotor, this chamber serving to parallelize the fibers under the effect of centrifugal force and to transport them, by passing through a fixed groove, to a twisting element

  consisting of a false twist pin.

  Such a device is, as said previously, re-

  laterally difficult to implement and, moreover,

  the twisting member which it comprises does not allow control

precisely thread the fibers.

  Prior to this solution, it had been proposed

  SE in FR-A-1 546 714 to adapt a particular false twist device at the outlet of the turbine (rotary chamber). According to this document, it is proposed to use a fixed assembly comprising a metal wire instead of a rotary false twist spindle.

  rigid, smooth around which the wire passes in a helix.

  If such a device makes it possible to increase the rate of tor-

  sion communicated to the wire, it does not, however, allow

  aim to increase winding speeds and by

then productivity.

  More recently, as appears from the article published in the magazine "Textile Industry - n 1131 March 1983 pages 229 and 230", it has been proposed to increase - 3 - (double) the production of spinning plants "open -end "by mounting in series several spinning shafts. Such solutions lead to complex assemblies and do not really correspond to an increase in the speed of production. However, we have found, and this is what is the subject of the present invention, an improvement to the device

  using the process whereby a twist addi-

  tional is communicated to the wire at the outlet of the rotor which overcomes the disadvantages of previous solutions and which allows an increase in production speeds for a

  given rotor speed while retaining good textual qualities

  them to the wire formed. This device is the result of a combination

  single rotor and false twist spindle con-

  industrial used as well

  for "open-end" spinning than for texturing.

  In general, the device according to the

  vention is of the type according to which a false twist spindle is disposed at the outlet of the rotor, this spindle imparting to the yarn an additional twist in the same direction as that given by the rotor and is characterized by the fact that the false twist spindle used

  allows, not only to give this addition twist-

  nelle over yarn but also exerts a pulling force

propelling the yarn.

  As the type of spindle, it is preferable to use

a brooch with crossed belts.

  The rate of additional false twist communicated to the yarn may vary, but preferably this rate is

set to a high level.

  It has been found that, by proceeding in the above manner

  tee, it was possible to practically double the speeds of the yarn call deliverer, deliverer arranged before the winding system and this, without harming the textile qualities of the yarn formed. In addition, in some cases, depending on the additional twist communicated, it is also possible to obtain a yarn having a particular structure compared to conventional open-end yarn. Indeed, especially in the case where a strong additional twist is used, the yarn obtained comprises, at its periphery, a layer of fibers which are twisted in the opposite direction to the twist imparted by the

spindle and rotor.

  Such a particularly simple solution was however not obvious to a person skilled in the art, this being proven, not only by the unexpected results which it makes it possible (increase in the winding speed without modifying the speed of the rotor and without deterioration of the properties of the wire) but also

  by the fact that, despite the teachings of the French patent

  here 1,546,714, since that date, the technicians had

  envisioned totally different solutions.

  The invention and the advantages which it brings will however be better understood thanks to the example of embodiment given below for information but not limitation and

  which is illustrated by the attached single diagram which represents

  feels an installation comprising a device according to the invention. This installation presents:

  - a fiber diet consisting, for example-

  ple, by a pot (1); - a call system (2) for the ribbon (3) contained in the pot; - a conventional rotary breaker (4) intended to parallelize the individual fibers of the ribbon (3); - a rotor (5), conventional, driven in rotation

  and inside which the fibers are projected

  vrésées by the breaker (4) - a conduit (6) disposed in the axis of the rotor (5) and for extracting the yarn (7) in said rotor -5-

  - a false twist spindle (8), of the short type -

  crossed webs, allowing additional twist to be imparted to the spun yarn, twist in the same direction as that imparted in the rotor (5); this spindle (8) also exerts traction on the yarn and tends to propel it; - a call provider (9) allowing to bring the

  spun (10) to the conventional winding system (11).

Example:

  On an installation of the aforementioned type, a yarn of fibers is made from a combed cotton ribbon (3)

weighing three grams per meter.

  The operating conditions are as follows: - feed speed in (2): - 0.864 m / min-; - turbine rotation speed (5): 11,000 rpm, delivery speed of the deliverer (9): 50 m / min; - false twist spindle (8): adjusted so

  to impart an additional twist to the yarn of approx.

ron 800 rpm.

  By working under the aforementioned conditions, a yarn having a count of 500 decitex is obtained, said yarn being usable in weaving, for example. By way of comparison, if one works in a conventional manner on the installation of the aforementioned type, that is to say without

  pass the yarn inside the false spindle

  twist (8), it has been found that to obtain a product

  having comparable characteristics, it was imperative

  tif to have a call speed at most equal to 20 m / min.

  The preceding example clearly shows the advantages provided by the invention and in particular the fact that for

  a given rotor speed, it is practical-

  ment to double production without practically

  harm the qualities of the yarn formed.

  In the previous example, the production speeds

  tion may seem weak but it should be noted -6-

  that this example was carried out on an experimental machine

  tale and that, of course, production speeds could be significantly higher depending on the

equipment used.

  Of course, the invention is not limited to the embodiment described above, but it covers all the variants produced in the same spirit. -7-

Claims (2)

  1 / Device for obtaining a fiber spun   according to the technique called "free fibers" according to which   the fibers from a food ribbon (3) are distributed inside a rotor (5) by means of a breaker (4) and are pressed by centrifugal force inside said rotor (5) in a way to. forming a yarn which is extracted by a conduit (6) disposed in the axis of said rotor, this installation also comprising at the outlet of the rotor (5) a false twist pin (8) which communicates an additional twist in the same direction as that given by the rotor, a twist which goes up inside said rotor (5), characterized in that said false twist pin (8) is made up   by a spindle which also exerts a drawing force   tion on the yarn and tends to propel it.   2 / Installation according to claim 1, character-   laughed at by the fact that the false twist pin (8)   is a spindle with crossed belts.