| 摘要 |
A developing cartridge having a collar member provided over an axially end portion of a developing roller shaft and movable in an axial direction thereof. The collar member includes a cap portion covering the axial end portion of the rotation shaft and electrically contacted with the rotation shaft, and a power-feed receiving portion electrically connected to the cap portion and electrically contactable with an external electrode. The power-feed receiving portion is provided integrally with the cap portion.
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