| 摘要 |
PURPOSE: A cassette having a cooling system is provided to supply a cover that covers a cooling water circulation pipe, so that the cooling water circulation pipe cannot be exposed, and to absorb an outer shock by the cover, thereby reducing a leakage of the cooling water circulation pipe. CONSTITUTION: The first groove(134) can be formed on a cassette lower side(132) only in semicircular shape. A cover(160) combined with a cassette is used to cover the first groove(134). The second groove(162) corresponding to the first groove(134) is formed on one side toward the cassette. If the cover(160) is closely adhered to the cassette so that the first groove(134) can be faced to the second groove(162), a round-shape space is made between the first groove(134) and the second groove(162), and a cooling water circulation pipe(150) is inserted along the space.
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