Image forming device and cartridge

Abstract

To further develop the prior art.SOLUTION: A cartridge includes: a holding portion that, by moving in an axial direction of a developing member, can move between a first position for stably holding a second unit at a separated position and a second position for stably holding it at a developing position; and a biasing portion that biases the holding portion from the second position to the first position in the axial direction of the developing member. At least one of a first gear portion and a second gear portion is a helical gear. When the second gear portion is driven by the first gear portion to rotate, the second gear portion receives a force from the first gear portion and moves in the axial direction of the developing member, whereby the holding portion moves from the first position to the second position. When the second gear portion is not driven by the first gear portion, the holding portion moves from the second position to the first position by a biasing force of the biasing portion.SELECTED DRAWING: Figure 301

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