2. Document Table Lift
The lift mechanism consists of the document table lift clutch [A], the lift shaft
[B], the document table position sensor [C], and the sensor actuator on the
gear [D].
In standby mode, the bend in the lift shaft [H] is pointing downwards and the
actuator is just inside the sensor (see the diagram on the next page).
When an original is placed on the document table, the document sensor [E] is
activated. Then, the paper feed motor [G] turns on. At the same time, the
document table lift clutch [A] turns on to rotate the lift shaft.
At this time, the actuator starts to turn anticlockwise, and the flat part of the
spring [I] that is loosely attached to the bend in the lift shaft pushes up the
document table (see the next page for a diagram).
When the top of the document stack is pushed up against the pick-up roller, it
can rise no more. However, the mechanism continues to push up against the
tray until a half-turn of the shaft has been completed (i.e., until the actuator
leaves the document table position sensor). At that time, the document table
lift clutch and the paper feed motor turn off. If the actuator does not leave the
sensor within a certain time, a document table error will occur.
The feed motor turns on again at a motor speed which depends on the
scanning resolution, and the pick-up clutch [F] turns on to feed the top sheet
of the original (see Original Feed and Separation on the next page).
[E]
[G]
[F]
[A]
[C]
[D]
[A]
[F]
[B]
G404D510.pcx
DETAILED SECTION DESCRIPTIONS
October 9th, 1995
SCANNER PROCESS
2-10
