| 摘要 |
PURPOSE:To reduce the load of a rotary drive part for recording carrier and miniaturige the device by loading a center core of the recording carrier to said rotary drive part after actuating for a fixed period a pressure means which presses the center core of the recording carrier to its attachment surface. CONSTITUTION:A magnetic sheet cassette 2 is put into a holder 21 and moved down toward an arrow A while a cassette holder 21 is moving up. As a result, a normally open type switch 27 is closed by the edge part of the holder 21. Then the DC voltage is applied to a bridge circuit, a comparator and a solenoid 26 respectively. Thus an armature rod 26a of the solenoid 26 is protruded for prescribed time, e.g., about 1sec. As a result, an arm 23 turns clockwise, and a center core 3 of a magnetic sheet 1 is pressed to a spindle 8 and bring into contact with a reference surface 8a at a flange part. In this case, the excess pressure is absorbed by the warp of a neck part 23b of the arm 23. This avoids the application of a large load to a rotary drive part. |
