When the scan unit's lever that comes back to the sheet scan position pushes the system gear pin, the system gear starts rotating in clockwise direction.
Due to the system gear rotation, the pin B on the planet
gear mounting arm is guided in the cam groove B, and the planet gear B is
engaged with the system gear. Along with the system gear rotation,
the scan unit locking lever moves toward the lock position.
Rotation of the system gear releases the pin A on the planet
gear A mounting arm from the cam groove A. The planet gear A moves to the intermediate position between the scan unit drive side gear
and the sheet scan drive side gear. At this time, the belt stops moving, and
the scan unit stops accordingly just before the sheet scan
position.
Click on pictures to zoom
Rotation of the system gear releases the pin B on the planet
gear B mounting arm from the cam groove B, and the planet gear B is disengaged
from the system gear. After the disengagement, the system gear is kept rotating
in clockwise direction by the system gear biasing spring. The scan unit locking
lever is moved by the system gear, and it stops after pushing the scan unit to
the locking rib. Keep rotating the motor in the counter-clockwise direction for
the sheet feeding operation.
Image forming operation details by next post: