| 摘要 |
PURPOSE:To obtain a magnetic disk driving device which has excellent operating functions, by composing of a collet chuck part of a shutter, the 1st and the 2nd cam bodies rotatable through the shutter, a collet wheel which slides up and down through the 2nd cam body, can a collet fitted to a pin fitted to a base. CONSTITUTION:When a disk is inserted, the operating surface of the shutter 41 is held horizontally and the 1st cam body 42 and the 2nd cam body 47 are both held nearly horizontally. The 2nd cam body 47 presses the collet where 63 down. Then, the collet 61 engages a hub 73. When the disk is not inserted, the operating surface of the shutter 41 is pressed up and while the 1st cam body 42 is pressed down, the 2nd cam body 47 is pressed up. At this time, the collet wheel 61 has a hollow shaft 62 and the collet 61 pressed up by a collet pressing spring 64 to disengage the collet 61 from the hub 73. |
