Library device and accessor device

1. A library device comprising:

a housing comprising a substantially rectangular parallelepiped shape, the housing comprising a first surface and a second surface differing from the first surface, the first surface comprising a first track extending in a horizontal direction, the second surface comprising a second track parallel with the first track, the first and second surfaces being surfaces of outer walls, the outer walls defining the substantially rectangular parallelepiped shape of the housing, the first surface being a surface of a bottom wall of the outer wall; and

an accessor device that is provided within the housing, the accessor device comprising a first portion engaging with the first track, and a second portion engaging with the second track, the second portion being positioned above the first portion, the accessor device moving along the first track,

wherein the second track comprises an open top channel shape, a part of the second track being formed by the second surface, and

a bottom part of the channel shape is positioned directly under the second portion and is out of contact with the second portion.

2. The library device according to claim 1 , wherein the first track is a regulating part that regulates a movement direction of the accessor device when the accessor device moves within the housing.

3. The library device according to claim 1 , wherein the second portion comprises at least one shape of a set of a depression and a projection.

4. The library device according to claim 1 , further comprising a friction prevention sheet that is attached on a portion of the second surface to be in contact with the second portion.

5. The library device according to claim 1 , wherein the second surface is a side surface of the outer walls, the side surface being substantially perpendicular to the first surface.

6. The library device according to claim 1 , further comprising:

a magazine that is provided within the housing and stores a plurality of data cartridges; and

a drive device that is provided within the housing,

wherein the accessor device inserts one of the data cartridges into the drive device, and

the drive device reads data from a recording medium within the inserted data cartridge.

7. The library device according to claim 1 , wherein the second portion is provided above the first surface.

8. The library device according to claim 1 , wherein the second portion comprises a plate shape and extends substantially parallel with the second surface.

9. An accessor device that is provided within a housing comprising a substantially rectangular parallelepiped shape, the housing comprising a first surface and a second surface differing from the first surface, the first surface comprising a first track extending in a horizontal direction, the second surface comprising a second track parallel with the first track, the accessor device moving along the first track, the first and second surfaces being surfaces of outer walls, the outer walls defining the substantially rectangular parallelepiped shape of the housing, the first surface being a surface of a bottom wall of the outer walls, the accessor device comprising:

a first portion that engages with the first track; and

a second portion that engages with the second track, the second portion being positioned above the first portion,

wherein the second track comprises an open top channel shape, a part of the second track being formed by the second surface, and

a bottom part of the channel shape is positioned directly under the second portion and is out of contact with the second portion.

10. The accessor device according to claim 9 , wherein the second portion is provided above the first surface.

11. The accessor device according to claim 9 , wherein the second portion comprises a plate shape and extends substantially parallel with the second surface.