| 摘要 |
PURPOSE:To perform positioning of a disk by driving force of a driving pin and rotation driving simultaneously by providing a vertically movable disk driving pin in a spindle and providing a hole that becomes a reference of rotation, and a contact face to which the driving pin is brought into contact by rotation of the spindle in the center core. CONSTITUTION:A center core 11 is energized downward by attracting force of a magnet 14, and a driving pin 17 is pushed downward. When a spindle 13 is rotated, the driving pin 17 is also rotated and slid upward by a leaf spring 15 at the position of a fan-shaped hole 20. By further rotation, the driving pin 17 comes into contact with the contact face 20' of the hole 20. At this time, the center core 11 is pushed in the direction of the arrow, and moved until the reference face 19' of a square hole 19 comes into contact with a spindle 13, and positioning is completed. When the spindle 13 is rotated further, the center core 11 is rotated by driving force of the driving pin 17 keeping a state in which the reference face 19' is in contact with the spindle 13. |
