Canon GP405 - Detecting the Level of Paper

CHAPTER 7 PICK-UP/FEEDING SYSTEM
7-18
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
D. Detecting the Level of Paper
The machine checks the volume of paper in the cassette, and indicates it in terms of four levels.
The level is identified using a sensor and the light-blocking plate mounted to the lifter gear. As
the cassette runs out of paper, the lifter moves up gradually; when the cassette fully runs out of
paper, the cassette sensor (Q1604 for cassette 1) detects the absence of paper.
Figure 7-120
Paper full Paper absent
Note: The diagrams represent views from the rear.
Figure 7-121 Level of Paper in the Cassette (upper)
Light-blocking plate
Lifter
Pick-up roller
Paper
Lifter
Pick-up roller
Paper
Lifter
Q1606
Q1607
(upper cassette)
Light-
blocking
plate
Gear when full late
Lifter
condition
Gear and
level sensor