Yarn winding machine

Details Yarn winding machine Yarn winding machine

1999-05-11

2000-06-06

Walsh, Donald P.

Winding, tensioning, or guiding

Helical or random winding of material

Alternately or sequentially wound spools

2424747, 2424757, 2424764, 242157R, B65H 5422

Patent

active

060708271

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a yarn winding or takeup machine for winding a continuously advancing yarn to a package.
A yarn winding or takeup machine of the described type is disclosed in EP 0 374 536 and corresponding U.S. Pat. No. 5,029,762. In this machine, a continuously advancing yarn is wound to a package. After the package is fully wound, a transfer occurs automatically from the full package to an empty tube. To this end, the full package and the empty tube are each supported on a winding spindle, each winding spindle being mounted in cantilever fashion for rotation on a spindle turret. To transfer the yarn, the full package is rotated by rotating the spindle turret from the winding range to a transfer range, and the empty tube from the transfer range to the winding range. Once the winding spindle with the empty tube thereon is rotated to a starting position of the winding range, a yarn transfer device swings into the yarn path between the empty tube and the full package, so that the yarn partially loops about the empty tube. After a positioning device has lifted the yarn out of the yarn traversing device and guided the yarn into a catching position, the yarn is caught in a slot of the empty tube. Thus, the yarn transferring procedure starts only when the spindle turret has reached the starting position of the winding range.
It is therefore an object of the invention to improve the initially described yarn winding machine in such a manner that the transfer of the yarn from the full package to the empty tube occurs in the shortest time possible. A further object of the invention lies in that during the transfer the yarn tension fluctuates as little as possible.


SUMMARY OF THE INVENTION

The above and other objects and advantages of the present invention are achieved by the provision of a yarn winding machine for winding a continuously advancing yarn wherein the transfer of the yarn from a full package to an empty tube occurs during the rotation of the spindle turret. With that, it is possible to start the transfer procedure before reaching the starting position of the winding range, and to catch the yarn on the empty tube before reaching the starting position. To this end, the yarn transfer device of the winding machine swings from an idle, position to a deflecting position, which is defined by a stop mounted to the spindle turret. The stop is positioned such that the yarn deflected by the transfer device loops around the empty tube with a minimum looping that is needed for catching. Subsequently, the yarn extends from the contact roll to the empty tube and thence, via the deflecting position of the yarn transfer device to the full package. The yarn transfer device contacts the stop in a frictional engagement such that the location of the deflecting position changes along with the rotation of the spindle turret. With that, the relation between the empty tube and the deflecting position remains substantially constant, so that the looping of the yarn about the empty tube remains essentially unchanged. In this phase, the yarn can be transferred from the full package to the empty tube.
The yarn transfer device may include an extension which, in the deflecting position, rests against the stop for sliding movement therealong. This has the advantage that the relative movement between the spindle turret and the yarn transfer device proceeds without generating substantial frictional forces. The extension facing the stop could additionally be provided on its surface with a protection against wear.
The stop may have a curved stop surface, which permits realizing a particularly gentle transfer of the yarn. The curved stop surface provides that the relation between the empty tube and the deflecting position is variable. Thus, it is possible to adjust at the start of the transfer procedure a minimal looping of the yarn about the empty tube, which increases during the rotation of the spindle turret. Only after the positioning device has guided the yarn into the catching position

REFERENCES:
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patent: 4969607 (1990-11-01), Busenhart et al.
patent: 5016829 (1991-05-01), Schippers et al.
patent: 5029762 (1991-07-01), Behrens et al.
patent: 5219125 (1993-06-01), Rigg
patent: 5344090 (1994-09-01), Nakai et al.
patent: 5526995 (1996-06-01), Westrich et al.
patent: 5566904 (1996-10-01), Hashimoto
patent: 5716016 (1998-02-01), Iwade et al.
patent: 5779170 (1998-07-01), Siepmann et al.

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