Winding – tensioning – or guiding – Helical or random winding of material – Distributing material along the package
Patent
1998-11-13
2000-02-15
Walsh, Donald P.
Winding, tensioning, or guiding
Helical or random winding of material
Distributing material along the package
2424771, B65H 5428
Patent
active
060243201
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a yarn traversing mechanism for use in a winding apparatus for winding a continuously advancing yarn onto a rotating bobbin to form a yarn package.
A yarn winding apparatus of the described type is known from EP 0 677 019 and corresponding U.S. Pat. No. 5,624,081. In this apparatus, the yarn is reciprocated by means of a traversing apparatus in a direction transverse to the direction of the advancing yarn along a predetermined traverse stroke. The traversing apparatus is of the rotary blade type. It is therefore necessary that for purposes of equalizing the traversing speed over the entire traverse stroke, the yarn be deflected from the traversing plane by means of a guiding edge of a guide plate. This permits compensation of differences in the yarn guiding speeds of the rotary blade. Moreover, to equalize the looping angles on the guiding edges which occur as a result of deflecting the yarn, the known winding apparatus is provided in each end region of the traverse stroke with an auxiliary guide plate. Each of these auxiliary guide plates penetrates with its opposite guiding edge the traversing plane such as to deflect the yarn in the opposite direction.
With the above arrangement, the problem arises that during a package doff, the yarn is not freely deflectable in the stroke end regions and, thus, cannot be removed from the traversing range. In the stroke end regions, the deflection of the yarn is limited by the guiding edge of the main guide plate and the opposite guiding edge of the auxiliary guide plate.
Accordingly, it is the object of the invention to further develop a winding apparatus of the initially described kind such that in the stroke end regions, the yarn can be removed from the traversing apparatus for purposes of doffing a package. A further object of the invention is to make the length of the traverse stroke variable.
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 for a yarn winding apparatus 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. A drive is provided 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. Also, 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, and an auxiliary yarn guide plate is positioned in at least one of the end regions of the traverse stroke and on the other side of the traverse plane, with the auxiliary guide plate defining an auxiliary guide edge which opposes the main guide edge.
In accordance with the invention, the auxiliary guide plate is movable in a direction transverse to the traversing plane such that its opposite guiding edge penetrates the traversing plane to a lesser extent or not at all. Thus, in a sectional region between a point of transition and the stroke reversal point, the yarn is guided by the rotary blade. In this arrangement, the point of transition is the position, in which the guiding edge of the main guide plate penetrates the traversing plane, so that in this partial region, the guiding edge extends until reaching the traverse stroke end outside of the traversing plane. Thus, in the point of transition the yarn disengages from the guiding edge of the main guide plate. Since the opposite guiding edge of the auxiliary guide plate, which serves to deflect the yarn, is removed from the traversing plane, the yarn is free for being received by a yarn catching elemen
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patent: 5624081 (1997-04-01), Turk et al.
Heinemann Wolfgang
Schippers Heinz
Thiel Arno
Barmag AG
Walsh Donald P.
Webb Collin A.
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