Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1995-08-01
1997-04-29
Mansen, Michael R.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
B65H 5428
Patent
active
056240813
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a yarn winding apparatus having a yarn traversing system which includes a guide edge and a pair of oppositely rotating blades for respectively moving the yarn in opposite directions along the guide edge. Such a yarn winding apparatus is known, for example, from DE 34 04 303 A1; EP 120 216 A; DE 34 17 457 C2; DE 37 03 731 A1.
In the yarn traversing systems of these yarn winding apparatus, the guide edge has the following function: the yarn entraining arms or rotary blades have a constant angular speed, but have between the stroke ends a different guiding speed in the traversing direction, in which the yarn is to be reciprocated parallel to the package axis. The guiding speed is dependent on the constantly changing angular position of the rotary blades and, therefore, is sinusoidal. The main guide edge deflects the yarn from the traversing plane such that these speed differences are compensated in desired manner. A corresponding configuration of the guide edge allows to accomplish that the traverse speed is constant between the stroke ends--i.e., apart from the short reversal regions, in which the direction of movement is reversed. However, the configuration of the guide edge and the rotary blades also allows to predetermine desired laws of movement. In this connection, the traversing plane is described as the tangential plane which extends through the apex yarn guide and the subsequent rotating cylinder to which the yarn advances. The apex yarn guide is arranged centrically above the traverse stroke. It is spaced apart from the rotating cylinder such that the yarn is able to stand the yarn tension fluctuations which result from the traversing motion. These yarn tension fluctuations result from the fact that the yarn length between the apex yarn guide and rotating body changes continuously, i.e., increases and decreases, as a result of the traversing motion. The rotating body is generally a contact roll, to which the yarn advances, and about which the yarn loops partially, so as to then advance to the package.
Yarn traversing systems of the prior art permit to reciprocate the yarn over a long traverse stroke, for example 250 mm, with only one rotor for each direction of movement. As a result, however, it is necessary to compensate for great differences in the guiding speed. For this reason, the guide edge extends, in particular in the central region of the traverse stroke, far into the traversing plane, whereas it extends in the region of the traverse stroke ends close to the traversing plane. Accordingly, the looping angle of the yarn on the guide edge is large in the central region of the traverse stroke, and accordingly the looping angle of the yarn on the guide edge is small in the region of the stroke ends.
It is the object of the invention to avoid these great differences in the looping angle, which also lead to different yarn tensions, and to thereby enable long traverse strokes.
SUMMARY OF THE INVENTION
The above and other objects and advantages of the present invention are achieved by the provision of a yarn traversing apparatus which comprises means for reciprocating an advancing yarn transversely to its advance direction over a predetermined traverse stroke and so as to define a traverse plane, and at least two guide arms mounted for rotation about closely adjacent parallel or coaxial axes so that the rotating arms define closely adjacent parallel planes and the extremity of each rotating arm is adapted to pass along the traverse plane. The arms are rotated in opposite directions so that one arm moves in a direction toward one end of the traverse stroke and the other arm moves in the opposite direction and from the one end of the traverse stroke toward the other end thereof. Also, a yarn guide rail is mounted on one side of the traverse plane and defines a main guide edge which extends in a direction generally parallel to the traverse stroke and through the traverse plane in a medial portion of the yarn traverse stroke to thereby guide the y
REFERENCES:
patent: 3650486 (1972-03-01), Hasegawa et al.
patent: 4505436 (1985-03-01), Schippers et al.
patent: 4561603 (1985-12-01), Schippers et al.
patent: 4798347 (1989-01-01), Schippers et al.
patent: 4991783 (1991-02-01), Sugioka
patent: 5176330 (1993-01-01), Tone
Schiminski Herbert
Turk Herbert
Barmag AG
Mansen Michael R.
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