Sharp AM-900 Service Manual page 56

AM-900U
7.11. Switching operation (3) from the fixed scan mode to the sheet scan mode
Scan unit drive side gear train
Planet gear B
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.
7.12. Switching operation (4) from the fixed scan mode to the sheet scan mode
Scan unit drive side gear train
Planet gear B
Locking rib
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 disen-
gaged 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 counterclockwise direction for the sheet feeding opera-
tion.
Sheet scan drive side gear train
Planet gear A
Pin A
Cam groove A
Scan unit
Lever
System gear biasing spring
Sheet scan drive side gear train
Planet gear A
(Scanner unit)
System gear biasing spring
Motor gear
(drive source)
Counterclockwise rotation:
switching operation
Pin
Scan unit locking lever
Motor gear
(drive source)
Counterclockwise rotation: Sheets
are fed to the sheet scan section.
Scan unit locking lever
3 – 9
System gear
System gear