Controlling The Movement Of Paper - Canon NP6412 Service Manual

CHAPTER 5 PICK-UP/FEEDING SYSTEM
C.

Controlling the Movement of Paper

1. Controlling the Registration Roller
The registration roller is controlled by a spring clutch, control ring, pre-registration roller paper
sensor (Q751), and registration clutch solenoid (SL2).
The microprocessor on the DC controller PCB turns on the registration clutch solenoid at a
specific timing in response to the paper detection signal from the pre-registration roller paper sen-
sor. When the registration clutch solenoid turns on, the claw will leave the control ring, and the
drive of the main motor will reach the registration roller to move the copy paper to the photosensi-
tive drum.
Spring clutch
Control ring
M1
Claw
DC controller PCB
5-6
COPYRIGHT © 1999 CANON INC.
Registration roller
SL2
Pre-registration roller paper detection signal (RPD)
Figure 5-106
CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Paper detecting lever
Copy paper
Pre-
registration
roller paper
sensor
(Q751)