| 摘要 |
As shown in FIG. 1, a clockwise helical groove 111 is formed on the outer periphery surface of a roller 11 toward one end from the center position in the axial direction. Further, a counter-clockwise helical groove 112 is formed on the outer periphery surface of the roller 11 toward the other end from the center position in the axial direction. The roller 11 rotates, being accompanied by traveling of a magnetic tape 22. The helical groove 111 of the roller 11 gives a regulating force F1, which points toward the center position in the axial direction, to the magnetic tape 22. Similarly, the helical groove 112 of the roller 11 gives a regulating force F2, which points toward the center position in the axial direction, to the magnetic tape 22. That is, the magnetic tape are given the regulating forces F1 and F2 simultaneously that point toward the center position in the axial direction of the roller 11. A result is that the magnetic tape is restrained from swinging to one end or the other end in the axial direction of the roller, and the tape traveling becomes stable. Also, the roller 11 is configured of a rigid member.
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