| 摘要 |
PURPOSE:To improve the operability in case of unlocked time of a case by arranging a freely rotatable door in a cassette insertion path and forming an engaging groove having prescribed taper surfaces to be engaged with said door on an extension case. CONSTITUTION:The rotatable door 4 which usually colses an inlet part is fitted to a rotary shaft 4A in the insertion path 3 through a twisted coil spring 5. The engaging groove 13 having taper surfaces 13A, 13B is formed on the back of the extension case 10. When the extension case 10 is inserted into the path 3, the door 4 falls and contacts with the tape surface 13A, so that the case 10 is prevented from separation and made locked stat. When the case 10 is drawn out at the time of unloading, the door 4 is rotated in the clockwise direction by the taper surface 13B and the door 4 is released from the groove 13. Thus, the door 4 is unlocked only by the drawing operation without forming a means such an unlocking button and the operability can be improved. |
