Pole-base assembly driving apparatus for magnetic recording/reading apparatus

A driving apparatus for loading or unloading a pair of pole-base assemblies which are reciprocated along a guide rail formed on a main deck to move a magnetic tape to contact a head drum, comprising:

• a first link member with a first and a second end, the first end of the first link member being connected to a first pole-base assembly;
• a second link member with a first and a second end, the first end of the second link member being connected to a second pole-base assembly;
• a first loading gear connected to the second end of the first link member, the first loading gear having a first gear part, a second gear part, and a non-gear part, the second gear part being stepped with respect to the first gear part;
• a second loading gear connected to the second end of the second link members, the second loading gear being engaged with the first gear part of the first loading gear so that it is driven in association with the first gear;
• and
• a main gear which is rotated by power received from a driving motor mounted on the main deck, the main gear being selectively engaged with the first loading gear upon rotation of the main gear so as to load or unload the pole base assemblies, the main gear comprising:
• a main gear part formed at an outer circumference so as to receive power from the driving motor;
• a connecting gear part formed at a desired region so as to engage the second gear part of the first loading gear at a position lower than the main gear part;
• a slide wing part protruding in the form of an arc at a position lower than the main gear part so as to slidably contact the non-gear part of the first loading gear to restrict free rotation of the first loading gear.

A driving apparatus for moving a pair of pole-base assemblies in a recording/reading apparatus, comprising:

• a first link member with a first and a second end, the first end of the first link member being connected to a first pole-base assembly;
• a second link member with a first and a second end, the first end of the second link member being connected to a second pole-base assembly;
• a first loading gear connected to the second end of the first link member, the first loading gear having a first gear part, a second gear part, and a non-gear part;
• a second loading gear connected to the second end of the second link members, the second loading gear being engaged with the first gear part of the first loading gear to be driven by the first gear;
• and
• a main gear rotated by a driving motor, the main gear being selectively engaged with the first loading gear upon rotation of the main gear so as to move the pole base assemblies, the main gear comprising:
• a main gear part formed at an outer circumference so as to receive power from the driving motor;
• a connecting gear part formed at a desired region so as to engage the second gear part of the first loading gear at a position lower than the main gear part;
• a slide wing part protruding in the form of an arc at a position lower than the main gear part so as to slidably contact the non-gear part of the first loading gear to restrict free rotation of the first loading gear.