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CHAPTER II -17
2.2 Paper Transfer
2.2.1 Paper Supply
The pick-up roller picks up one sheet of paper from the paper feeder every time it is rotated
and feeds it to the paper feed roller.
Fig. 2.19
The paper is gripped between the pick-up roller and the separation pad and separated into
individual sheets.
The pick-up roller is directly connected to the sector gear, whose rotation is forcibly
stopped by the gear stopper; when the pick-up solenoid is activated, the clutch mechanism
is engaged by the solenoid action 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
pick-up roller pushes 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-purpose sheet feeder (MPF) pushes against the top
of form sensor actuator, the registration sensor lever is caused to turn, and the photo
sensor detects this motion. When this signal from the sensor is detected the paper feed
roller is stopped temporarily by the clutch. The paper is fed to the nip point between the
paper feed roller and the pinch roller in the multi-purpose sheet feeder, and the skew of the
paper is corrected by pushing the leading edge of the paper against the nip point. When the
paper feed roller starts to be rotated again when it is released by the clutch, paper with the
leading edge correctly aligned, is fed by the paper feed roller and is transported to the
transfer roller.
Clutch mechanism (engaged/released by the solenoid assembly)
Released when the solenoid is ON and engaged when the solenoid is OFF.
Fig. 2.20
Hopper plate
Pa
p
ers
Pick-up roller
Registration sensor lever
Separation pad
Paper
Pinch roller
Transfer roller
Drum
Paper feed roller