Textiles: manufacturing – Warp preparing or handling – Reeling or beaming
Patent
1994-12-12
1996-05-21
Crowder, C. D.
Textiles: manufacturing
Warp preparing or handling
Reeling or beaming
242149, B65H 5900
Patent
active
055177387
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The present invention relates to a thread tensioner in which a deflection of the thread takes place.
To produce a woven or knitted fabric, longitudinal threads (warp) and weft threads are required. The warp is produced on a winding apparatus which comprises a bobbin creel and a winding machine. Each warp thread is drawn off from a package, specifically "overhead". During this overhead draw-off, the threads are virtually without tension and have to be tensioned by thread tensioners, so that they can be wound in an orderly manner on the warp beam or the like.
2. Prior Art
Several thread tensioners are already known. However, these have disadvantages. The construction of the previously known thread tensioners is, as a rule, relatively complicated, because, in addition to braking means, they also have deflecting means. Such thread tensioners do not generate a constant tension in the thread, but this tension can change in an uncontrolled manner according to the circumstances prevailing in the thread tensioner. The upper limit of the tension attainable by means of the known thread tensioners is relatively low in terms of the threads handled nowadays. Thread tensioners of known construction cannot be miniaturized, this being necessary for the handling of very thin threads.
The object of the present invention is to specify a thread tensioner which does not have the disadvantages mentioned and which, moreover, also offers advantages.
Embodiments of the present invention are explained in more detail below by means of the accompanying drawings. In these:
FIG. 1 shows the present thread tensioner in a vertical longitudinal section,
FIG. 2 shows the thread tensioner according to FIG. 1 in a top view and partially in section, and
FIG. 3 shows a vertical section III--III through the thread tensioner according to FIG. 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S) OF THE INVENTION
The thread tensioner (FIGS. 1 to 3) comprises a carrier 1, on which the individual components of the thread tensioner are mounted. FIGS. 1 and 2 also partially show a package 2, from which a thread 3 is drawn off "overhead". The carrier 1 shown is designed as a longitudinal piece and has a U-shaped profile. In the case shown, this profile piece 1 is oriented in such a way that its bottom 21 is located on the side of the carrier 1 facing away from the package 2, and that the legs 8 of the U-profile hang down from the bottom 21 and are directed towards the package 2. However, this profile piece 1 can also be oriented in reverse, namely in such a way that the bottom 21 of the carrier 1 faces the package 2. A plurality of thread tensioners are normally mounted on such a carrier 1. In the accompanying drawings, only one of these thread tensioners is shown. A plurality of carriers 1 form a creel, in which the threads 3 drawn off from packages 2 and to be attached to a warp beam or the like (not shown) are handled. These carriers can be arranged both horizontally and vertically.
The thread tensioner comprises, furthermore, a tension device 5 which is assigned at one end to an orifice 23 (FIG. 3) in the bottom 21 of the carrier 1. That portion of the thread 3 which is fed to the tension device 5 is designated by 301. That thread portion which runs off from the tension device 5 bears the numeral 302.
During the overhead draw-off, the portion 301 of the thread 3 drawn off from the package 2 is virtually without tension. For winding onto a warp beam or the like, however, the thread portion 302 fed to the warp beam must have a specific tension. The necessary amount of thread tension is influenced by a plurality of circumstances, and the thread tensioner is to be designed so that it can take as exact an account as possible of the circumstances mentioned during the generation of the tension. The thread tension is obtained from a difference between a pulling force, with which the warp beam or the like acts on the one end of the thread portion 302 running off from the tensioner, and a b
REFERENCES:
patent: 2646941 (1953-07-01), Borges
Benninger AG
Crowder C. D.
Worrell Jr. Larry D.
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