Pole base loading apparatus and main chassis for magnetic recording/reading device

A main chassis for a magnetic recording/reading device, comprising:

• a head drum for recording information on a tape and reading the information recorded on the tape;
• a pair of pole base units for guiding a tape so that the tape is wound around the head drum;
• a pair of loading gears linked to the pole base units, for rotating around shaft parts, respectively;
• a hook integrally formed with at least one of the loading gears;
• and
• a guide part installed around a shaft part of at least one of the pairs of loading gears for supporting and guiding the loading gears, wherein the guide part comprises a slit for guiding the hook and coupling the hook to the main chassis, and an escape part having an extended outer diameter formed at one end of the guide part so as to allow a free entrance of the hook.