| 摘要 |
PURPOSE:To prevent a U-shaped cover body from being opened carelessly under a closed condition at a time using a cassette by forming an engaging part between the U-shaped cover body and a cassette opening surface only on a part around the center of the cassette. CONSTITUTION:A wedge-like notch part 30 is formed only a part of an inner ridge 4b of the U-shaped cover body 4 and the engagement between a projected edge 18 of the opening part of the cassette body 1 and the U-shaped cover body 4 is secured except parts close to both the end side parts 5 of the cover body 4. Consequently, the turning interrupting function of the cover body 4 can be practically maintained under the closed condition and the cover body 4 is prevented from careless opening at the time of actual use.
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