Ricoh FT5034 Service Manual page 79

5. Pick-off Mechanism
- Touch and Release Mechanism -
The pick-off solenoid energizes just after the
registration rollers turn on. The pick-off lever
rotates counterclockwise (rear view) and
pushes the pawl shaft pin. Then the pawl shaft
rotates clockwise and the pick-off pawls touch
the drum. The pawl springs hold the pick-off
pawls on the shaft and prevent them from
touching the drum too strongly.
When the leading edge of the paper passes
the pick-off area and just before it reaches the
fusing unit, the pick-off solenoid turns off. The
pick-off lever spring then rotates the pick-off
lever and moves the pick-off pawls away from
the drum.
- Side to Side Movement -
The pick-off pawls do not always contact the
drum in the same place but instead move
slightly to the side on each copy cycle.
The pick-off shaft and the cam rider are joined
by a one-way bearing. Each time the pick-off
pawl solenoid turns on, the one-way bearing
causes the cam rider to turn together with the
pick-off pawl shaft. As the cam rider turns, it
and the pawl shaft are forced to move laterally
by a cam. When the pawl shaft rotates the
pawls away from the drum, however, the cam
rider does not turn.
Pawl lateral movement is 0.1 to 0.2 millimeter
per copy cycle. After moving about 8
millimeters, the cam rider passes the "step" of
the cam and the pawl shaft is returned to its
start position by the pawl shaft spring.
Pawl Spring
Pick-off Pawl
Pick-off Solenoid
- 78 -
Pawl Shaft
Pawl Shaft Pin
Pawl Shaft
Spring
Cam Rider
Shaft
Cam Holder
Cam Rider
Pick-off Lever
Pick-off Lever
Spring
Pawl Shaft
Pin
One-way
Clutch
Pawl
Shaft