The planet gear A moves toward the scan unit drive side gear and stops at the intermediate position because the pin A on the planet gear. A mounting arm is restricted its movement by the cam groove A. The planet gear B moves into engagement with the system gear so that the system gear rotates. Along with the rotation of the system gear, the scan unit locking lever starts rotating in the release direction.
Switching operation from the sheet scan mode to the fixed scan mode (2).
Rotation of the system gear releases the pin A on the planet gear A mounting arm from the cam groove A, and the planetary gear A is engaged with the scan unit drive side gear. The scan unit starts moving toward the fixed scan side.
Switching operation (3) from the sheet scan mode to the fixed scan mode.
Due to the system gear rotation, the pin B is guided in the cam groove B to turn the planet gear B mounting arm. The planet gear B is disengaged from the system gear, and the system gear loses its power.
Switching operation (4) from the sheet scan mode to the fixed scan mode.
The system gear is driven by the system gear biasing spring until it reaches the stopper at the release position of the scan unit locking lever.
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