| 摘要 |
<p>PURPOSE: To obtain a cassette door opening/closing mechanism surely performing opening/closing operation with simple structure. CONSTITUTION: Extended shaft parts 11A and 11B are provided to pierce the through- holes 12C and 12D of bearing parts 12A and 12B and supported to freely rock. Torsion springs 30A and 30B whose rotating direction is different from that of cylindrical coupling members 20A and 20B engaged with the shaft parts are inserted between the bearing parts 12A and 12B and the cassette door 10. Semicircular projection parts 11C and 11D are provided at both ends of a columnar part 10A provided at the upper end of the cassette door 10, and circular arc-shaped projection parts 22A and 22B engaged with the projection parts 11C and 11D are provided on the coupling members 20A and 20B. Furthermore, plate parts 23A and 23B are provided so that the pullout parts 31A and 31B of the torsion springs are engaged with the coupling members. A part where the coupling member is engaged with the columnar part is constituted so that the coupling member can rotate only in one rocking direction of the cassette door 10, and the cassette door 10 opened by rocking in one direction is energized in a closing direction by the restoring force of one torsion spring, while the plate parts 23A and 23B abut on front panels 1A and 1B so as to restrain the energizing.</p> |
