| 摘要 |
A shutter device includes a main body and a seal member. The main body is an annular body fitted around an outside of one end of a cylindrical tube which includes a discharge outlet in a part of the circumferential face near the end in the axial direction, and includes a first opening having a same shape as the discharge outlet and a second opening having a first opening end and a second opening end. The seal member has a length equal to a distance from a vicinity of the first opening end on an outer circumferential face of the main body, passing across the first opening, the second opening end and the first opening on an inner circumferential face of the main body in the stated order, to a vicinity of the second opening end. |
