Winding – tensioning – or guiding – Helical or random winding of material – Distributing material along the package
Patent
1998-06-12
2000-02-22
Walsh, Donald P.
Winding, tensioning, or guiding
Helical or random winding of material
Distributing material along the package
2424773, B65H 1808
Patent
active
060270640
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a yarn winding apparatus and method for winding a continuously advancing yarn onto a rotating bobbin to form a yarn package.
A winding apparatus of the described type is known from DE 38 26 130.
In this known machine, the yarn is reciprocated by means of a rotary blade type traversing apparatus along a guide plate with a guiding edge. In such winding machines, a higher mass distribution of the yarn occurs in the region of the stroke reversal, which leads to an elevated edge formation at the package ends. To avoid such bulging accumulations of material at the package ends in the region of the stroke reversal, the guide plate can be changed in its position such as to permit variation of the length of the traverse stroke. As a result of displacing the guide plate, it is accomplished that an earlier transfer of the yarn occurs between the associated, oppositely rotating blades, which leads to a decrease in the traverse stroke.
However, this method brings along the problem that with a shortened traverse stroke, the yarn remains momentarily unguided in the region of the stroke reversal. The displacement of the guide plate results in that the yarn drops from the tip of the guiding rotary blade before reaching the stroke reversal point. The yarn remains now unguided, until the returning rotary blade reaches the yarn. Such unguided situations of the yarn lead to an irregular deposit of the yarn on the package.
Accordingly, it is the object of the invention to further develop a yarn winding machine and a method of the initially described kind such as to permit formation of cylindrical packages without a saddle formation while the traverse stroke remains unchanged.
SUMMARY OF THE INVENTION
The above and other objects and advantages of the present invention are achieved by the provision of a yarn winding apparatus and method which comprises 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, and drive means for rotating each of the arms 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 toward the other end thereof. A main yarn guide plate 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 yarn and control its traversing speed. Also, the yarn guide member includes means for varying the configuration of the guide edge during the winding operation so as to vary the traverse speed.
In a rotary blade type traversing apparatus, the yarn is displaced along a guiding edge for purposes of equalizing the traversing speed within the traverse stroke. The guiding edge is curved in such a manner that the yarn on the rotary blade is deposited on the package surface at a predetermined traversing speed. In this process, the mass distribution of the yarn on the package is dependent on the respectively adjusted traverse speed. Thus, in accordance with the invention, a variation in the shape of the guiding edge permits adjustment of any desired profile of the traversing speed within the traverse stroke. The special advantage of the invention lies in that it permits winding of cylindrical packages with a uniform package surface. Furthermore, the packages exhibit a uniform hardness over their entire surface.
In a preferred variant of the winding machine, the shape of the guiding edge is changed in the medial region of the traverse stroke. This has the advantage that the stroke reversal points, in which the yarn is transferred between the rotary blades, remain unaffected. During the entire traverse stroke, the yarn is guided at a predetermined traversing speed. Any undefined yarn deposits on the packages are a
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Barmag AG
Pham Minh-Chau
Walsh Donald P.
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