Olivetti d-Copia 12 Service Manual page 28

3.5.2 Cassette paper feed operation
1) The figure below shows the positions of the pick-up
roller, the paperfeed clutch sleeve, and the paper feed
latch in the initial state without pressing the COPY
button after lighting the ready lamp. The paper feed
latch is in contact with the projection of the clutch sleeve.
2) When the COPY button is pressed, the main drive motor
starts rotating to drive each drive gear.The pick-up
drive gear also is driven at that time. Since, however, the
paper feed latch is in contact with the projection of the
clutch sleeve, rotation of the drive gear is not transmitted
to the pick-up roller, which does not rotate.
3) After about 0.1 sec from when the main motor starts
rotating, the tray paper feed solenoid (PFS) turns on
momentarily.
This disengages the paper feed latch from the projection
of the clutch sleeve, transmitting rotation of the pick-up
drive gear to the paper feed roller shaft, rotating the pick-
up roller to feed the paper.
4) After more than half rotation of the pick-up roller, the
paper feed latch is brought in contact with the projection
of the clutch sleeve, stopping rotation of the pick-up
roller.
3-6
5) At this time, the paper is fed past the paper entry detection
switch (PPD1), and detected by it. After about 0.15 sec
from detection of paper by PPD1, the tray paper feed
solenoid (PFS) turns on so that the clutch sleeve projection
comes into contact with the paper feed latch to stop the
pick-up roller. Then the pick-up roller rotates for about
0.15 sec so that the lead edge of the paper is evenly
pressed on the resist roller, preventing against skew
feeding.
6) To release the resist roller, the tray paper feed solenoid
and the resist solenoid are turned on by the paper start
signal to disengage the resist start latch from the clutch
sleeve projection, transmitting rotation of the resist drive
gear to the resist roller shaft. Thus the paper is transported
by the resist roller.
7) After the resist roller starts rotating, the paper is passed
through the pre-transfer guide to the transfer section.
Images are transferred on the paper, which is separated
from the OPC drum by the drum curve and the separation
section.
8) The paper separated from the drum is passed through
the fusing paper guide, the heat roller (fusing section),
POD (paper out detector) to the copy tray.
Service Manual Y101700-5