Thread handling area guide, traverse motion unit of fiber bundle and device for producing fiber bundle package

A traversing device for stabilizing the yarn path of a thin and uniform flat fiber bundle without causing any trouble, e.g. entanglement of single fibers, and ensuring a good winding appearance of the winding package of fiber bundle, and a yarn path guide for stabilizing the yarn path without causing any trouble, e.g. entanglement of single fibers. The yarn path guide for guiding a traveling yarn comprises a guide roll and a guide roll supporting member wherein the supporting member has a rotating shaft at a position twisted at a right angle to the rotating shaft of the guide roll. The yarn path guide is arranged such that the guide roll is inclined with respect to the yarn path through rotation of the supporting member about the rotating shaft in response to variation of the yarn path and the fiber bundle is guided automatically in the yarn path direction. The traversing device further comprises a yarn guide mechanism for guiding a fiber bundle performing such an operation that a traverse guide deviates from the yarn path in the original yarn path direction.