| 摘要 |
PURPOSE:To prevent invasion of external air at replacement, by forming a part of an enclosed case sealing a magnetic medium, a magnetic head and an access wheel with a flexible member and coupling a coil bobbin driving the access wheel at the position of the flexible member. CONSTITUTION:A center shaft 1a of a magnetic disc 1 piled up by three-stage on the same shaft is linked with a pulley for external drive at the outside of the case. A magnetic head 4 is correspondingly provided for the disc 1, and the heads 4 are gripped with a support wheel 5 incorporatedly. The wheel 5 is arranged so that it can move on a rail 6 fixed to a base plate 3 supporting the pulley 2 freely rotatably. The discs 1, the heads 4, the wheel 5, and the rail 6 are sealed with a plate 3, a cover 7 and a flexible cover 8. A coil 9 is fixed to the wheel 5 via the cover 8 and the coil 9 is electromagnetically coupled with a magnetic circuit forming member 11 fixed to a main base plate 10 to drive the wheel 5 accessingly. Thus, the coil can easily be replaced and the invasion of external air can be avoided. |
