|
(11) | EP 1 457 446 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
|
|
|
|
|||||||||||||||||||||||
| (54) | Tension control and slack eliminating device for a yarn winder |
| (57) The present invention prevents a yarn from being excessively tensed and broken owing
to an increase in yarn tension when the yarn is wound around a slack eliminating roller
during a yarn splicing operation. A yarn threading member 22 is arranged at a position
where it can engage with a yarn on the shortest yarn path between an upstream side
guide 23 and a downstream side guide 36 arranged upstream and downstream, respectively,
of a slack eliminating roller 21. The upstream side guide 23 constitutes yarn moving
means for moving the yarn from the shortest yarn path to a yarn path on which the
yarn does not engage with the yarn threading member 22. If a yarn splicing operation
is to be performed, then before the start of the operation, the yarn moving means
holds the yarn away from the yarn path corresponding to the shortest distance and
at a position at which the yarn does not engage with the yarn threading member 22.
Then, immediately before the yarn splicing operation, the yarn is moved to the position
of the yarn path corresponding to the shortest distance and is then engaged with the
yarn threading member 22. Accordingly, the direction of the operation of engaging
the yarn with the yarn threading member 22 does not involve an increase in yarn tension.
Therefore, the yarn can be reliably prevented from being excessively tensed and broken
(Fig. 4). |