| 摘要 |
A cassette with a loosening prevention mechanism includes a cassette case rotatably supporting reels including a strip of medium wound therearound. Each of the reels has, at its one end, a rotation prevention portion and an outer shaft portion and, at its other end, an inner shaft portion. A resilient member is integral with the cassette case. The reel has an inner end in contact with the resilient member and is pressed toward the outer shaft portion by the resilient member. A rotation prevention mechanism is operative when the rotation prevention portion of the reel is brought into engagement with a rotation stop portion formed on an inner peripheral wall of said cassette case, and inoperative when a force applied from the outer shaft portion toward the inner shaft portion of the reel is greater than a pressing force by the resilient member.
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