Pick-Up From The Cassette; Pick-Up Operation - Canon NP7160 Service Manual

CHAPTER 5 PICK-UP/FEEDING SYSTEM
II. PICK-UP FROM THE CASSETTE
A. Pick-Up Operation
The pick-up roller and the feed roller are controlled by the pick-up solenoid (SL1).
The stack of copy paper inside the cassette is held up by the lifter, and the pick-up roller is
controlled by the pick-up solenoid and is kept away from the surface of the stack.
When the pick-up solenoid turns on, the claws move away from the pick-up gear, and the
drive of the main motor (M1) is transmitted to the pick-up roller and the feed roller.
A single sheet of copy paper is picked up and sent to the feed roller by the work of the pick-
up roller and the separation claws. If multiple sheets should be picked up, the feed roller and the
separation roller would serve to make sure that no more than a single sheet is sent forward to the
vertical path roller.
The copy paper is then moved by the vertical path roller to the registration roller. In response,
the registration roller controls the movement of the copy paper so that its leading edge matches
the image on the photosensitive drum.
Main motor drive
command
Registration paper detection signal (RGPDT)
Feed roller clutch drive command (FEED _ CL*)
DC
Registration roller
controller
clutch drive
command
PCB
(RG _ CL*)
Pick-up solenoid drive command (PU _ SL*)
Cassette paper detection signal (CSTPDT)
5–2
COPYRIGHT © 1998 CANON INC.
Power supply
PCB
Power supply
PCB
Figure 5-201
CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Registration roller
M1
CL2
Photosensitive
drum
CL1
SL1
Feed roller
Vertical
Pick-up
path roller
roller
PS5
PS4
Separation roller