| 摘要 |
A developer cartridge includes a casing, a developing roller, a sheet member, and a plurality of seal members. The casing accommodates developer and is formed with an opening for communicating inside of the casing with outside thereof. The developing roller is disposed on the opening and is rotatably supported on the casing. The sheet member is disposed between the casing and the developing roller. The plurality of seal members is attached to the sheet member in order to prevent the developer from leaking through the opening.
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