BOBBIN

PROBLEM TO BE SOLVED: To almost eliminate a re-coating process and clarify identification of a bobbin, by providing a recessed groove in a flange surface of the bobbin and providing identification coating in the recessed part. SOLUTION: Because coating is provided in a groove on the outside of a flange, the coating surface does not abut to a carriage floor or the outside of the flange even when bobbins are loaded in a tier state on a carriage during bobbin transportation, and therefore, the coating does not peel off. By forming the groove in a band-shaped ring form concentric with a bobbin rotation shaft, balance of the bobbins does not lose during rotation of winding bobbins, and color of identification coating can be clearly observed even when the bobbins rotates at a high speed. In addition, by providing ring-shaped recessed grooves in both flanges, identification labels can be seen from any direction of the flanges, and the balance of the bobbins during rotation can be seen well.