Controlling The Pickup Roller - Canon NP6512 Service Manual

CHAPTER 5 PICK-UP/FEEDING SYSTEM
B.

Controlling the Pickup Roller

1. Outline
The machine has two types of pickup rollers, i.e., cassette pickup roller, and multifeeder pickup
roller, and each of these rollers are operated by the drive of the main motor switched by means of a
gear unit. (In other words, only one roller is driven at any one time.)
2. Controlling the Cassette Pickup Roller
The cassette pickup roller is controlled by a spring clutch, control ring, pickup clutch solenoid
(SL1), and cassette pickup solenoid (SL5).
When the pickup clutch solenoid turns on, the claw moves away from the control ring, allow-
ing the drive to move to the pickup gear assembly through the spring clutch. Then, when the cas-
sette pickup solenoid turns on, the drive reaches the cassette pickup roller.
When the cassette pickup roller starts to rotate, copy paper is picked up from the cassette and is
sent as far as the registration roller by way of the vertical path roller. The registration roller controls
paper so that its leading edge will match the leading edge of the image on the photosensitive drum.
M1
Pickup clutch
5-2
COPYRIGHT © 1999 CANON INC.
DC controller PCB
Arm
SL1
SL5
Copy paper
Figure 5-102
CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Spring
Gear
Pickup roller
Pickup roller gear
When SL5 turns on, the spring causes
the pickup roller to rotate slightly,
causing the gear and the pickup roller
gear to engage.
Cassette pickup rollers