FR2470171A1 - FIBROUS TAPE CONDENSER FOR FREE-END WIRED DEVICES - Google Patents

Abstract

THE INVENTION CONCERNS THE TEXTILE INDUSTRY. THE FIBER TAPE CONDENSER WHICH IS THE SUBJECT OF THE INVENTION IS OF THE TYPE IN WHICH THE BODY 1 IS PROVIDED WITH A CHANNEL 2, TIGHTENING IN THE DIRECTION OF MOVEMENT OF THE TAPE AND ENDING WITH AN ORIFICE 3 OF RECTANGULAR PROFILE, THIS CHANNEL INCLUDING ON ITS INNER WALLS RIBS OR SIMILAR PROJECTIONS 6 MUTUALLY OPPOSED ARRANGED AT AN ANGLE WITH RESPECT TO ITS LONGITUDINAL AXIS 7, AND IS CHARACTERIZED IN THAT THE RIBS 6 ARE ARRANGED FOLLOWING THE ENTIRE LENGTH OF CHANNEL 2 AND RESPECTIVE ON THE OTHER OF ITS LONGITUDINAL AXIS 7, AND IN A MANNER THAT THE RESPECTIVE DIRECTIONS FOLLOWING WHICH THEY ARE AVAILABLE ARE CROSSED. THE CONDENSER IN QUESTION CAN BE USED IN PARTICULAR IN "OPEN-END" SPINNING TRADES, IN WHICH THE MAIN WORKING BODY IS A TURBINE OR SPINNING CHAMBER SUPPLIED WITH INDIVIDUALIZED FIBERS.

Description

The present invention relates to the textile industry, more specifically

  to professions for free-end spinning, and notably relates to a condenser of ribbons

  fibrous intended to be used in these trades.

  The invention can find a particularly effective use in pneumomechanical "open end" spinning machines, in which the main working member is a turbine or spinning chamber fed with individualized fibers. One of the factors influencing the quality of yarn, especially its regularity, is the regular supply

  fibers in the turbine after their individualization.

  A regular supply of fibers can be obtained for example by a uniform distribution of the fibers along the entire cross section of the ribbon when it is fed into the individualizing device (combing device

or stretching).

  As a device for the uniform distribution of fibers in the ribbon, slit condensers are employed

different constructions.

  Condensers are known that are installed upstream of the drawing device (see, for example, the patent for

  USA. No. 3,947,923, class 19-288, published April 6, 1976).

  This condenser has the shape of a triangle inside which are provided elements forming a vertical slot allowing movement of the ribbon (of the wick) downwards during the passage of the bulged parts of the wick. Moving from

  the wick is limited by a partition.

  Inside the condenser, the ribbon can occupy

any position.

  However, with such a displacement of the ribbon, that is to say its displacement under the action of its own weight, the tape tends to gather in tuft concentrating in the middle of the condenser, which causes its irregular arrival in the drawing device and therefore affects the quality of the drawing. It is possible to ensure a regular distribution of the fibers in the ribbon by using the condenser which constitutes the state of the art prior to the present invention (see for example the patent application of FRG No. 2,359,176 of 30.05.74 ). This condenser has a body inside which is formed a channel going narrowing in the direction of movement of the tape. On the side of the exit of the ribbon, the channel ends with an orifice of rectangular shape, while inside the channel there are opposite projections disposed at an angle by

  relative to the longitudinal axis of the canal.

  Thanks to the presence of these opposite projections it is possible to obtain a uniform distribution of the fibers in the ribbon, because these protrusions coming into contact with the ribbon expel the excesses or tufts of fibers from the ribbon.

middle towards the edges of the ribbon.

  However, if the structure of the ribbon is such that most of the fibers are at its edges, and the smallest part in the middle, these projections are not able to ensure the regular distribution of the fibers

in the entire section of the ribbon.

  The invention therefore relates to a ribbon condenser in which the projections provided in the channel would be executed and arranged to ensure the distribution

  regular fibers throughout the ribbon section and a-

  thus improve the quality of the yarn produced.

  This problem is solved by a condenser of the type whose body has a channel narrowing in the direction of movement of the ribbon, ending in a rectangular shaped orifice, and inside which

  are arranged ribs or projections similar to each other

  opposite, disposed at an angle relative to its longitudinal axis, characterized, according to the invention, in that the ribs are arranged along the entire length of the channel, respectively on either side of its longitudinal axis, and so that the respective directions according to which they are arranged intersect. The arrangement of the ribs along the length of the channel and the interlacing of their respective directions ensure a regular density of the fibers throughout the ribbon section, since one of the ribs moves the excess fibers to an edge of the ribbon, while another rib, the direction of which intersects with that of the first,

  push the excess fibers towards the other edge of the ribbon.

  To facilitate the manufacture of the condenser, it is advantageous that each rib or projection is present

form of a step.

  To maintain the integrity of the ribbon structure in its middle part, and to avoid any disturbance of the fiber flow formed at the outlet of the ribbon of the condenser channel, it is effective that the ribs provided inside the channel are arranged so that the distance between them, on the side of the exit of the ribbon of the channel, is equal to the maximum dimension of the cross-section of the channel

at its outlet.

  In order to increase the action to which the swollen parts of the ribbon are subjected in the entry and working areas, it is effective, in particular, to arrange the said ribs so that the value of the distance between them, on the side of the ribbon the entrance of the ribbon into the channel, being between 0.4 and 1.0 times the maximum dimension of the cross section of the channel at its inlet. Said distance

  is chosen equal to 0.4 in the case where the ribbon is

  in the condenser is a conventional ribbon, that is a ribbon with a lenticular section, so that the main mass of the fibers is in the middle part of the ribbon and, consequently, the most strong veins distributing clumps of fibers

  towards the edges of the ribbon is exerted in the middle of the ribbon.

  We choose said distance equal to 1.0 in iB case

  o The ribbon passing through the condenser has

  along its edges, that is, when the most intense effect of distributing the tufts of the edges of the ribbon towards its median part of lesser density

  is exerted by the ribs along the edges of the ribbon.

  Such a condenser can find a particular use

  Efficiently effective in stretching mechanisms having a feeder having the tape clamp line at an angle to the surface

flat ribbon.

  In this case, the distance measured at the inlet side of the channel between the surfaces carrying the ribs is greater than the maximum dimension of the orifice of

exit of the canal.

  The invention will be better understood and other purposes, details and advantages thereof will be more readily apparent.

  light of the explanatory description that follows.

  various embodiments given solely by way of non-limiting examples, with references to the appended nonlimiting drawings in which: FIG. 1 shows a condenser according to the invention, seen from the side of the inlet orifice of its channel; - Figure 2 is a sectional view along II-II of Figure 1; - Figure 3 is a sectional view along III-III of Figure 1; - Figure 4 is a sectional view along IV-IV of Figure 3; - Figure 5 illuste another embodiment of the condenser according to the invention; - Figure 6 is a sectional view VI-VI of Figure 5; - Figure 7 is a sectional view along VII-VII of Figure 5; FIG. 8 is a cross sectional view of a

  condenser according to the invention, illustrating the action exerted

  formed by the ribs or projections on the fiber ribbon; FIG. 9 is a perspective view, partially broken away, of a condenser according to the invention, used

  in combination with a drawing mechanism.

  The condenser according to the invention comprises a body 1 (FIG. 1) inside which is formed a channel 2 (FIG. 2) narrowing in the direction of movement of the ribbon and ending in an orifice 3 (Figure 1) rectangular profile. The channel 2 is formed by walls 4 and walls 5, the walls 5 being of greater width

that the walls 4.

  Inside the channel 2 there are mutually opposed mutually opposed ribs or projections 6 disposed on the wide walls 5. These projections are inclined at an angle "0 <I" to the longitudinal axis 7 of the channel 2 and that their respective directions intersect, that is to say that they are oriented at mutually opposite inclinations with respect to said axis, as shown in the drawings

  1, 3 and 4. Such an embodiment of the ribs ensures the dis-

  persion of the tufts of fibers in the ribbon, which ensures

  the equalization of the ribbon in all its section.

  The ribs 6 (FIG. 2) provided inside the channel 2 are arranged in such a way that the value of the distance 2 "la" separating them ("a" being the distance between the longitudinal axis 7 of the channel and each ribs) at the entrance of the ribbon in the channel 2 is between 0.4 and 1.0 times the maximum dimension of the cross section of the canal

at its inlet 8.

  The distance 2 "a" is chosen equal to 0.4 times said maximum dimension in the case where the ribbon passing through the condenser is a ribbon of usual configuration, that is to say with a lenticular section, while the distance 2 "is chosen equal to 1.0 times said maximum dimension when the ribbon arriving in the condenser has

bulges along its edges.

  FIGS. 5 and 7 show an embodiment of the condenser in which each rib or similar projection is in the form of a step 9. These steps are also inclined at an angle t (FIG.

  in relation to the longitudinal axis 7 of caml 2 and are

  within the channel such that the distance "b" which, on the side of the exit of the ribbon of channel 2, separates them from one another is equal to the maximum dimension

  from the right section of the channel to its outlet port 3.

  The condenser, object of the invention, operates from

following way.

  The fibrous ribbon 10 (FIG. 8) introduced into the condenser on the side of the inlet orifice 8 of the channel 2 and passing through this channel, which narrows, undergoes condensation therein before coming out through the shaped orifice. 3. As they pass along the channel, the bulged portions "c" of the ribbon 10 are "grasped" by the ribs 6 or 9 and are displaced by the latter in opposite directions as indicated on

Figure 8 by the arrows "A".

  In this way is obtained a regular distribution

  fibers throughout the cross-section of the ribbon

  condenser, which promotes a high degree of indi-

  vidualization of fibers and allows, therefore, to obtain

  a better quality of the son produced.

  As we know, a ribbon of fibers passing through pots and on reels acquires a flat shape under

the action of pressure.

  On the other hand, we know

  and in which the ribbon tightening line 11 in the pairs of feed rollers, as shown for example in FIG. 9, is disposed under

  an angle with respect to the plane side of the ribbon 10.

  In this case, the ribbon engages in the clamping zone by its narrow side and is distributed along the line

  clamping in tuft of undetermined form.

  To improve the individualization of the fibers and, consequently, to obtain a better quality yarn, it is effective that the flat side of the tape is arranged along the clamping line. This is achieved by using the

  condenser subject of the present invention.

  The ribbon 10, as shown in FIG. 9, engages in the inlet of the condenser so that its edges are between the walls carrying the steps, steps, similar projections or ribs 6, 9, these walls being at a distance "d" from one another. During the movement of the ribbon, the steps act more strongly on its edges and rotate the ribbon so that its flat part is arranged along the

  maximum dimension "b" of the outlet orifice, that is,

  say along the fiber clamping line by the - pair of feed rollers. To avoid damaging the ribbon along its edges due to the rapid narrowing of the channel, it is effective that the distance "d" between the walls bearing the ribs is greater than the maximum dimension "b" of the cross-section of the channel.

the outlet of the condenser.

  Of course, the invention is not limited to the embodiments described and shown which have been given by way of example. In particular, it includes all the means constituting technical equivalents of the means described, as well as their combinations, if these are executed according to its spirit and implemented

  within the scope of the following claims.

Claims (1)

R E V E N D I C A T I 0 N S _______________________ ___   - Fibrous ribbon condenser for free-end spinning devices, of the type whose body is provided with a channel narrowing in the direction of movement of the ribbon and ending with a rectangular profile orifice, said channel comprising on its inner walls of the mutually opposite ribs or mutually opposite projections disposed at an angle to its longitudinal axis, characterized in that the ribs are arranged along the entire length of the channel, respectively on either side of its longitudinal axis and so that the respective directions according to which they are arranged intersect.   - Condenser according to claim 1, characterized in that each projection or rib above is in step form.   Condenser according to one of claims 1 and 2   characterized in that said projections or ribs of the channel are arranged such that the distance between them, on the side of the channel ribbon outlet, is equal to the maximum dimension of the right section of said channel at its outlet.   - Condenser according to one of claims 1, 2 and 3,   characterized in that said projections or ribs of the channel are arranged such that the distance between them, on the side of the entrance of the ribbon in the channel, is equal to 0.4 to 1.0 times the maximum dimension of the channel. section   right of said channel at its inlet.   Condenser according to one of Claims 1 and 2,   used in combination with a drawing mechanism in the feeder from which the tape clamping line is disposed at an angle to the flat surface of the tape, characterized in that the distance measured at the orifice of channel inlet, between the surfaces provided with said projections or ribs is greater than the dimension   maximum of the outlet orifice of said channel.