| 摘要 |
<p>PROBLEM TO BE SOLVED: To accurately position at a mounting position by a method wherein there are provided at least three projections arranged so as to be in a straight line on a lower face of a body to be mounted and a two-face contact type coupling member which is arranged on a mounting face corresponding to these projections, and which comes into point contact with respective projections at two positions to be engaged. SOLUTION: Since respective projections 13 are fixed on a lower face of a cassette 11 so as to have different directions from each other, the respective projections 13 are restricted to each other only in a movement in a direction that the other projections 13 can move freely with respect to each other. Therefore, the cassette 11 is supported at a vertical three-point in respective positions in the three projections 13 and is positioned parallel to a mounting face. Together with it, three degrees of freedom on mounting faces X, Y,θare restricted by the three projections 13 to be positioned in a single sense. Accordingly, the cassette 11 comes into contact with a two-face contact type coupling member 14 to which the respective projections 13 correspond by their own weights, while it is guided to a position point automatically. Accordingly, it is possible to accurately position it at a mounting.</p> |
