PURPOSE: To obtain effective ejection of fluffy dust generated in a winder by connecting a suction pipe to a portion of a cover enclosing the portion where fluffy dust is apt to be generated so as to confine the fluffy dust in the cover and eject the same by suction.

CONSTITUTION: A first cover 19 for enclosing a feeding bobbin 4 is composed of a cylindrical cover 21, a tapered cover 22 and a balloon breaker 6. A second cover for enclosing a tenser portion has four side faces and upper face closed and an opening 24 at the lower face, with an opening of a suction pipe 28 communicated at an upper portion of the back face 27. When suction through the suction pipe 28 reduces the pressure in the interior of the second cover 20, an air flow is generated in the first cover 19 by release and ballooning of the yarn. The air flow goes along the suction flow generated in the second cover 20 to be led into the second cover 20 from which the air along with fluffy dust is sucked into and ejected through the suction pipe 28. Thus, fluffy dust can be ejected, being remarkably prevented from scattering.