(57) A device for producing a yarn from a staple fiber, comprising a pair of twisting
rollers rotatable in the same direction and arranged in a manner confronting each
other with a small gap between peripheral surfaces thereof, a spinning zone being
formed on the upper surfaces of the twisting rollers in the vicinity of confronting
portions of the rollers for condensing staple fibers to form a fiber bundle, at least
one of the twisting rollers being provided with a plurality of grooves on at least
one part of a peripheral surface thereof; a first duct for supplying a separated staple
fiber, provided with an outlet opening disposed closely above the spinning zone; a
second duct for sucking air, provided with an outlet opening disposed to confront
the outlet opening of the first duct while intervened by the spinning zone so that
the air is sucked from the spinning zone through a channel formed by the grooves;
and means for withdrawing the fiber bundle from the spinning zone in a direction substantially
along an axis of the twisting rollers to form a yarn.
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