Magazine holding structure and library device having the same

1. A magazine holding structure having a mechanism to control an extraction of a magazine from a case,

wherein the magazine includes a rail member which is installed on bottom surface of the magazine approximately parallel to an insertion/extraction direction, the rail member including a plurality of stepped portions formed at a side surface thereof;

wherein the case includes

a lock member which is installed rotatably within the same plane as the bottom surface of the magazine, the lock member including one portion which is located in a space below the magazine and another portion which is located beside the magazine,

an urging member which urges in a direction in which the rail member is installed so that a portion of the lock member located corresponding to the bottom surface of the magazine is engaged with the stepped portion, and

a movement mechanism which moves beside the magazine along the insertion/extraction direction of the magazine; and

wherein the lock member engaged with each stepped portion is released in such a way that the movement mechanism moved in the extraction direction of the magazine rotates the lock member in an opposite direction to an urging direction of the urging member.

2. The magazine holding structure of claim 1 , wherein one of the stepped portions is engaged with the lock member when the magazine is fully accommodated in the case.

3. The magazine holding structure of claim 1 , wherein the magazine is provided with a plurality of cells which accommodate a cartridge having a recording medium therein,

the stepped portions are formed respectively corresponding to the plurality of cells, and

the magazine is extracted up to a location in which a cell corresponding to an engaged stepped portion is exposed outside the case when the lock member is engaged with one of the stepped portions.

4. A library device including the magazine holding structure of claim 3 , comprising:

a drive device which writes information into the cartridge and reads information written in the cartridge,

wherein the movement mechanism is an accessor which extracts, inserts and conveys the cartridge from the magazine.

5. The library device of claim 4 , further comprising, a unit which controls the movement mechanism to be stopped at each location in which an engagement between the lock member and each stepped portion is released.

6. The library device of claim 4 , wherein the magazine holding structure is a plurality of magazine holding structures.