| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of the trouble that an ink jet button gets into the underside of an upper cover when the ink jet button is pushed. SOLUTION: A bottom part 103b in an opening 103b notched to a U shape of an upper cover 103 is formed with a stopper part 103c of a projecting shape toward a slider plate 104 side so that a front end 5a of the ink jet button 5 abuts surely on the stopper part 103c to regulate the working range of the ink jet button 5. Then, the problem that the ink jet button 5 gets into the underside of the upper cover 103 is solved.
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