| 摘要 |
A threading mechanism in a magnetic writing/reading apparatus wherein a leader block for taking a magnetic tape out of a tape cartridge is stabilized in motion and ensured to operate reliably even in a state of not holding the tape is to be provided. In the mechanism for threading the magnetic tape to a reel within the apparatus, the leader block for taking out a leader pin out of the tape cartridge is rotatably fitted to the arm shaft of a movable arm, and the leader block moves along guides at the time of loading the tape cartridge. Further, the leader block 10 has a leader block holder 11; when it is not holding the leader pin at the time of loading the tape cartridge, the leader block 10 is held on to the arm shaft by the leader block holder 11; and after an operation to grab the leader pin, is released from the arm shaft to become freely rotatable by the shift of the leader block holder 11.
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