| 摘要 |
PROBLEM TO BE SOLVED: To prevent the leakage of toner and to increase productivity by forming at least one of the contact parts of an upper or lower case and a bearing to a recessing shape. SOLUTION: The upper and lower cases 1 and 2 are constituted in such a manner that they are ultrasonically welded to hold a rotary shaft 4, in positions on the bearing 5 for the rotary shaft 4. The recessing parts 6 are provided in the upper and lower cases 1 and 2 respectively, and projecting parts 7 formed to fit these recessing parts 6 without gaps are provided in the bearing 5. In such a case, the upper and lower cases 1 and 2 and the rotary shaft 4 are firmly coupled to hold a rotary shaft part, regardless of the presence of an adhesive. On the contrary, the recessing parts can be provided in the positions where they are joined to the projecting parts of the upper and lower cases 1 and 2, in the bearing 5, as well. Further, when the recesses are provided at both of the cases 1 and 2 and the rotary shaft 4 and then, charged with the adhesive (rubber-like elastic material), the sealing effect of the cases 1 and 2 and the rotary shaft 4 are enhanced. |
