Textiles: spinning – twisting – and twining – Apparatus and processes – Twist setting
Patent
1997-09-23
1999-09-14
Stryjewski, William
Textiles: spinning, twisting, and twining
Apparatus and processes
Twist setting
28249, 57 5849, 57 5852, 57 5883, 57 5886, 57352, D01H 746
Patent
active
059504129
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an improved machine making it possible to carry out continuously the twisting or cabling of yarns followed by additional thermal treatment.
BACKGROUND OF THE INVENTION
Machines, used particularly for the production of yarns for carpets, have been provided for a very long time, as emerges particularly from FR-A-1,455,499 and from U.S. Pat. No. 3,525,205. It has also been proposed to use such machines for treating partially drawn synthetic yarns, drawing being carried out at the double-twist spindle, as emerges from FR-A-2,414,568.
As emerges from these documents, such installations consist of a central stand which supports a plurality of identical workstations comprising, as seen in the direction of passage of the yarn: horizontally (U.S. Pat. No. 3,525,205), followed by a cooling zone, and
In such installations, the yarn is maintained in the relaxed state during the thermal treatment and during the cooling phase prior to reeling.
Although the machines which are the subject of the abovementioned patents relate to the twisting of a single yarn, it has been proposed for a very long time to use similar machines for carrying out direct cabling operations, as emerges from U.S. Pat. No. 3,820,316. For this purpose, in such a case, the yarn coming from the package mounted on the spindle is combined with a second yarn which comes from a second reel mounted in a stationary manner on the stand of the machine and which is fed through the shank of the said spindle as far as a cabling head arranged in the extension of the latter.
SUMMARY OF THE INVENTION
Now an improvement upon such a type of machine has been found, this being the subject of the present invention, making it possible to improve the quality of the yarns produced, particularly as regards the feel and appearance of the article, for example a carpet, produced from such yarns.
In general terms, the machine according to the invention is of the type comprising, in a similar way to the teachings of U.S. Pat. No. 3,525,205, a central stand supporting a plurality of identical workstations, each comprising: be twisted or cabled together with a second yarn; tension which occurs as a result of the twisting or cabling operation;
In a similar way to the teachings of U.S. Pat. No. 3,820,316, in the machine according to the invention, which makes it possible to carry out both a twisting operation and a direct cabling operation, is characterized in that: approximately vertically system for said yarn being provided to an extremity of said oven in order to realize this to-and-fro.
This machine is characterized in that: end; a take-up system; during the phases of thermal treatment and of cooling. Such a possibility is achieved due to the presence of the take-up system which is provided in the upper part of the oven and which makes it possible to impart an exact constant tension during the period of the rise in temperature, which takes place between the entry delivery means and the said return and take-up member, and then to maintain the yarn in the completely relaxed state during the second passage through the oven and through the cooling zone.
In a first embodiment according to the invention, after thermal treatment and before winding, the yarn is received on a moving relaxation belt, where it forms a reserve, the receiving speed of the winding assembly being regulated so that the quantity of yarn put in reserve is maintained between two predetermined minimum and maximum values.
In another embodiment, the cooled path of the yarn is provided by means of rotary guide elements interposed between the exit of the oven and a tensioner positioned upstream and in the plane of symmetry of the winding system.
In both embodiments, the double-twist spindle and the winding system are advantageously positioned one above the other and are offset laterally in relation to the setting oven.
However, the invention and the advantages which it affords will be understood better from the exemplary embodiments which are given below and
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Gabalda Carlos Matas
Losson Gerard
ICBT Valence
Stryjewski William
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