EP0041484A1

EP0041484A1 - Feeding of rovings to spinning machines

Info

Publication number: EP0041484A1
Application number: EP81830074A
Authority: EP
Inventors: Giovanni Barro
Original assignee: Officine Savio SpA; Savio SpA
Current assignee: Officine Savio SpA; Savio SpA
Priority date: 1980-05-26
Filing date: 1981-05-15
Publication date: 1981-12-09
Also published as: DE3172878D1; IT1141795B; ATE16511T1; EP0041484B1; IT8083382A0

Abstract

The invention concerns improvements applied to creels for spinning machines, whether said creels be stationary or automatic, and also to spinning machines using said improved creels, whereby said improvements envisage the installation of a spiral twisting means (13, known in itself, immediately upstream from the drafting system (14-15) in such a way that said means (13) imparts to the roving (II) a false twist which in turn induces a greater consistency in said roving.

Description

The subject of this invention is improvements to creels for spinning machines; to be more specific, the subject of this invention is means known in themselves which are used in other machines with other functions, being installed on. creels for spinning machines.
Improved spinning machines which use the invention are. also the subject of this invention.
One purpose of this invention is to be able to use very heavy supply bobbins having even small threads forming on . them, with the assurance that the bobbin will be pulled in rotation without false drafts of the roving.
Next, it is a purpose of this invention to enable very large supply bobbins having a weight of even four kilos or. more to be used in the spinning machines.
The improvements applied to the creels serve, therefore, to cause the roving, which in itself is slender, not to . break during the normal work of unwinding the bobbin, this . work being carried out by the pulling action which the roving exerts on the bobbin.
A further purpose of this invention is to enable the roving to be pre-positioned as wished in automatic creels . wherein the bobbin is automatically replaced when it is finished.
The practice is known of installing in the finishers a. spiral which acts as a tension leveller for the roving as it passes during the processing.
According to this invention this spiral is installed in spinning machines immediately upstream from the pulling rollers and serves to give the roving a greater consistency; that is to say, it serves to cause the roving to assume a false twist which induces a greater consistency in the roving itself.
This greater consistency causes the roving not to break readily, and it therefore becomes able to exert a harder pull on the bobbins, thus enabling bigger and heavier bobbins to be employed.
Furthermore, the greater consistency determined by the spiral in an automatic creel enables the drafting system to take and work the new roving independently as the latter arrives.
The invention, therefore, envisages a spiral twisting means positioned upstream from the first pulling rollers of. the drafting system, whereby the spiral twisting means acts as a guide for the roving being fed so as to provide consistency in the roving before the latter enters the drafting system.
Moreover, the spiral twisting means, being connected . to the automatic creel, serves to position the roving and . predispose it automatically for delivery to the drafting system since the gripping of the roving is made possible automatically owing to the false twist imparted to it.
It is known that the roving as it leaves the bobbins, . whether it be of the type with one or two threads, and as it is used in spinning machines, has a very low consistency; and it is known that during the phase of the unwinding of the bobbin itself it is possible for the roving to be sheared or to lose fibres, thus interrupting the regular work flow.
. Being advantageously positioned immediately upstream . from the drafting system, the spiral serves precisely to prevent this drawback.
. Thus the invention can be applied to normal spinning machines or to spinning machines with an automatic creel and with pre-positioning of the roving.
The invention, therefore, is shown to consist in improvements to creels for spinning machines, whether such creels are stationary or automatic, the improvements being characterized by the fact that a spiral twisting means, known in itself, is installed immediately upstream from the drafting system and acts in such a way that it imparts to the roving. a false twist, which in its turn induces in the roving itself a greater consistency.
The invention is also concerned with spinning machines, whether they have a stationary or an automatic creel, characterized by envisaging upstream from the drafting system at least one spiral twisting means that serves to impart a false twist to the roving.
. With the help of the attached tables let us now see -some non-restrictive preferential solutions, which are given as examples.

Fig. I gives a general diagram of a possible spinning machine with a stationary creel;
Fig. 2 gives a general diagram of a possible spinning machine with an automatic creel.

. The invention envisages that the bobbins 10 may be of a type with one or two rovings and may be positioned on a stationary creel or on an automatic creel with or without a mo_- vable trolley to carry bobbins 19.
. The roving, or rovings, II unwinding from the bobbin 10 owing to the action carried out by the drafting system 14-15 passes or can pass through a device 18 that checks the roving before the latter reaches the pulling roller 14 of the drafting system 14-15..
Before reaching the pulling roller I4 of the drafting . system, the roving II enters a spiral twisting means 13, which provides the roving II with a false twist that gives . said roving II a greater consistency precisely in the zone . where it is most likely to break.
At the delivery end of the drafting system 14-15 the thread 17 is wound onto bobbins 16.
The spiral twisting means 13 can also be installed on a movable trolley carrying bobbins or on an automatic creel 19; in such a case the twisting means 13, besides providing the. roving II with greater consistency during processing, can . also serve as a pre-positioning element so as to facilitate. the gripping and delivery of the roving II to the organs 14. which pull or grip the roving itself II so as to send it on. the drafting system 14-15.
We have described a preferential solution here, but variants are possible for a technician in this field. Thus the proportions and sizes can be varied, and parts can be added. or removed; it is possible to instal the spiral twisting means I3 before the device which checks the roving even if . from experiments carried out by the author it has been shown that the best solution is obtained when the spiral twisting. means 13 is located near the pulling roller I4, etc. These . and other variants are possible within the scope of the . invention.

Claims

I. Improvements to creels for spinning machines, whether said creels be stationary or automatic, characterized by the fact that a spiral twisting means (13), known in itself, is. installed immediately upstream from the drafting system (14-15) and imparts to the roving (II) a false twist which in its turn induces in said roving (II) a greater consistency..
2. Spinning machines, whether they have a stationary or automatic creel, characterized by envisaging upstream from . the drafting system (14-15) at least one spiral twisting means (13) which has the task of imparting a false twist to the roving (II).
3. Improvements to creels for spinning machines, and spinning machines using said creels, as in the claims hereinbefore and as described and shown and for the purposes allowed.