II - 15
2.2
Paper Transfer
2.2.1
Paper Supply
The pickup roller picks up one sheet of paper from the paper tray at every one rotation and
feeds it to the registration roller one by one.
The paper is gripped between the pickup roller and the separation pad and separated
into individual sheets.
The pickup roller is directly connected to the sector gear, whose rotation is forcibly
stopped by the gear stopper; when the pickup solenoid (solenoid C assembly) is
activated, the gear stopper is released and the sector gear is driven; when it has
completed one full turn its rotation is stopped again by the gear stopper.
The paper drawn out by the pickup roller presses against the top of form sensor lever
and the paper top position/absence of paper is detected by sensing the motion of the
lever.
2.2.2
Paper Registration
When paper picked up from the multi-paper tray (MPT) presses against the top of form
sensor actuator, the registration sensor lever is caused to turn, and the photo sensor
detects this motion.
With this signal from the sensor the registration roller is stopped of its rotation temporarily
by the clutch. Then paper is fed to the nip point between the registration roller and the
pinch roller in the process unit, and the skew of the paper is corrected by the bump of the
leading edge of paper against the nip point.
When the registration roller starts to rotated again by the motion of clutch, paper, leading
edge of which has been aligned, is fed by the registration roller and is transported to the
transfer roller.
Papers
Pickup roller
Print pad
Hopper plate
Fig. 2.20
Fig. 2.21
Paper
Clutch mechanism (engaged/released by the solenoid assembly)
Released when the solenoid is ON and engaged when the solenoid is OFF.
Paper feed gear
Transfer roller
Registration roller
Pinch roller
Drum
Registration
roller
Registration sensor lever
