| 摘要 |
PROBLEM TO BE SOLVED: To prevent a cartridge from being loaded as it is in a holder even when the cartridge is erroneously inserted in a whatever manner into the holder. SOLUTION: The top of a chassis 1 is provided with a fitting shaft 5 to be fitted into a positioning cut 61 which is formed at the front end of the cartridge 6 and is opened 62 at the front surface and under surface. The fitting shaft 5 has a receiving shaft 50 which supports the under surface of the cartridge 6, a guide part 51 which is formed to a tapered shape in such a manner that the diameter is made smaller upward from the top surface of the receiving shaft 50 and an erroneous insertion control part 52 which extends upward from the top surface of the guide part 51 approximately orthogonally with the chassis 1 surface. The erroneous insertion control part 12 exists on a migration path M at the under surface of the cartridge 6 and the front end of the erroneous insertion control part 12 exists lower than the migration path L at the top end edge of the opening 62 when the cartridge 6 is inserted into the holder 3.
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