To provide an apparatus and a method for feeding yarn capable of providing excellent durability, efficiently and continuously feeding all types of yarn lines of which thickness and contractibility vary with constant tension to a subsequent process.
Tension of the yarn line 16 released from a yarn roller 14 by means of vertical winding is unwound at a short cycle before and behind the yarn line 16 during passing through a tension cushioning device. Yarn feeding speed is controlled so that variance in the tension at a long cycle detected by a tension detector 22 may meet the preset prescribed tension. Therefore, the yarn 16 can be fed to the subsequent process 18 with the constant tension all the time. Besides, a subsequent process monitor 26 is provided, therefore variance in the tension of the yarn 16 caused by operation/stop of the subsequent process 18 can be prevented, thus eliminating wasteful yarn 16 fed to the subsequent process 18 and wasteful energy consumption of the tension cushioning device 20.
SUZUKI HIDETOSHI
FUJITA HIROSHI
TAKAHIRA KENJI
