| 摘要 |
A library unit of the present invention includes a magazine, a cartridge, at least one sensor and an accessor. The cartridge is loaded in the magazine and arranged in a direction in which the magazine is loaded to or unloaded from the library unit. The sensor is provided for the library unit and activated to make an output, when the magazine is pulled out to a predetermined position, whether or not the magazine is positioned facing the sensor. The accessor identifies a position of the magazine according to an output of the sensor and receives the cartridge.
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