| 摘要 |
PURPOSE:To attain the stable running of a tape by providing a spiral groove onto a tape slide face of a rotary drum so as to guide stably the tape into a guide groove provided to a stationary drum. CONSTITUTION:The spiral groove 2 is formed to have a positive angle in the drive direction of the rotary drum 1. The groove 2 is moved toward the arrow 12 attended with the drive of the rotary drum 1. Thus, the tape 9 receives a combined force 13 between the suction force 11 of the groove 2 and a force generated attended with the movement of the groove 2 in the direction of arrow. In selecting the angle and the depth or the like of the groove 2 properly, a force 8 is cancelled and the tape 9 is guided stably along the guide slot 5 formed to the stationary drum 4. Thus, the tape is run stably.
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