Sharp AM-900 Service Manual page 53

7.5. Switching operation (1) from the sheet scan mode to the fixed scan mode
Scan unit drive side gear train
Planet gear B
Locking rib
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.
7.6. Switching operation (2) from the sheet scan mode to the fixed scan mode
Scan unit drive side gear train
Planet gear B
Locking rib
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 mov-
ing toward the fixed scan side.
Sheet scan drive side gear train
Planet gear A
(Scanner unit)
System gear biasing spring
Sheet scan drive side gear train
Planet gear A
(Scanner unit)
System gear biasing spring
Motor gear
(drive source)
Clockwise rotation:
switching operation
Scan unit locking lever
Motor gear
(drive source)
Clockwise rotation:
switching operation
Scan unit locking lever
3 – 6
AM-900U
System gear
System gear