| 摘要 |
<p>PURPOSE:To prevent a board from slipping down from a board accommodation cassette, by limiting coming of the board in and out of the board accommodation cassette by moving up and down a rod specifying a structure. CONSTITUTION:A board drop preventing stopper is constructed of a rod 23 of a specific structure and a board drop preventing plate 24, and grooves 26, 42, 43 and 44 of specific structures are made in the rod 23. Besides, a board accommodation cassette is provided with a projection 25 which is put in the groove 26 of the rod 23, and when the rod 23 is moved up and down, it is made to rotate, since the groove 26 is limited by the projection 25. According to this constitution, the projection for preventing the drop of a board blocks up the entrance and exit of the board automatically when the board accommodation cassette is lifted up, and therefore the board is prevented from slipping down. When the cassette is placed on a flat part, besides, the projection for preventing the drop of the board detaches automatically from the entrance and exit of the board.</p> |
