Threading mechanism for magnetic recording/reproducing apparatus

A threading mechanism for taking out a leader pin secured to one end of a magnetic recording tape from a single reel cartridge, moving said leader pin to a predetermined guide path and threading said magnetic recording tape around a reel in a magnetic recording/reproducing apparatus, said mechanism comprising:

• a cartridge loader for holding said cartridge;
• a deck base which mounts a loader guide for moving said cartridge loader to a cartridge loading position;
• and
• a threader drive for holding said leader pin and guiding said leader pin to said reel through said predetermined guide path when said cartridge loader is moved to said cartridge loading position;
• wherein said threader drive provides a leader block having a hook which holds said leader pin, and said leader block is rotated to engage said hook with said leader pin in cooperation with a retractor cam provided for said cartridge loader and a retractor provided for said deck base;
• and
• wherein during the movement of said cartridge loader to the cartridge loading position, said retractor cam rotates said retractor around a retractor pin, and rotates said leader block to engage said hook with said leader pin, and also said retractor is detachably mounted to said leader block so that said leader block is released therefrom at the time when said cartridge loader reaches said cartridge loading position.