| 摘要 |
PURPOSE:To ensure smooth revolution of a rotor by using a rotary guide wall which guides the revolutions of a rotor through such a position where the guide wall encloses the outer peripery of the rotor and also control the horizontal position of the rotor to its revolving center. CONSTITUTION:An opening part 6 is formed at a single side (front side) on a cassette housing 4 and usually closed (when not in use) by a vertical wall (cover body) 7. The outer periphery of the plate 12 is a circular shape (or approximately circular) centering on a rotary shaft 12b. Therefore the plate 12 has no contact with the rear face of a cassette 1 (housing 4) when the plate 12 is turned. Furthermore, collision is avoided between the plate 12 and the part 6 (especially the right and left sides of the opening 6). In addition, a rotary guide 35 is formed at the inside of a lower case 3 (upper case 2) so that it encloses the outer peripheral side of the plate 12. Thus the horizontal position of the plate 12 is controlled for its revolving center.
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