Core yarn manufacturing machine and core yarn manufacturing method

A core yarn manufacturing machine including a spinning unit formed by a hollow guide shaft member wherein the yarn passage is formed in the axis direction, and a whirling flow generating nozzle for applying whirling flow to the tip section of the hollow guide shaft member, wherein a core yarn is manufactured by winding the fiber bundle drafted and guided to the spinning unit, around the core fiber fed to the spinning unit along with the fiber bundle in the tip section of the hollow guide shaft member;

• comprising:
• a suction force producing means for producing a suction force toward the interior of the yarn passage from an entrance of the hollow guide shaft member;
• a core fiber feeding apparatus for feeding the core fiber to the spinning unit;
• and
• a control device for controlling the operation and non-operation of the whirling flow generating nozzle, the operation and non-operation of the suction force producing means, and the operation and non-operation of the core fiber feeding apparatus.