| 摘要 |
A cartridge inserting path is provided, into which a recording-medium cartridge containing a recording medium and having a cut-off portion at a front end can be inserted. An erroneous-insertion preventing mechanism is provided. The erroneous-insertion preventing mechanism includes a fitting portion which is located approximately in a middle of the cartridge inserting path and is fitted into the cut-off portion of the recording-medium cartridge, and a contacting portion which is located approximately in a middle of the cartridge inserting path and comes into contact with the front end of the recording-medium cartridge. When the recording-medium cartridge is inserted in an erroneous orientation, the fitting portion comes into contact with the front end of the recording-medium cartridge, and, thus, prevents further insertion of the recording-medium cartridge. When the recording-medium cartridge is inserted in a correct orientation, the fitting portion is fitted into the cut-off portion of the recording-medium cartridge, and the contacting portion is pushed by the front end of the recording-medium cartridge and moves in a direction such that further insertion of the recording-medium cartridge is enabled.
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