C. Identifying the Size of Copy Paper
1. Outline
The size of copy paper inside the cassette is identified by the paper size sensors
mounted to the rear of the cassette holder.
When the cassette is slid inside the cassette holder, the paper size sensors are
activated by the bosses on the cassette, enabling detection of the width and the length
of copy paper.
The copier identifies the size of paper based on combinations of paper width and
length and, at the same time, determines the point of scanner reversal and the control
method for blank exposure.
The bosses used to push the paper size sensors operate in conjunction with the
guide plate inside the cassette, and the arrangement is determined by adjusting the
guide plate to the size of paper to be used.
2. Identifying the Size of Copy Paper
The copy paper length sensor uses two photointerrupters, and the length of copy
paper is identified based on combinations of the outputs from these two
photointerrupters.
On the other hand, the copy paper width sensor uses variable resistors, and the
paper width is identified in reference to the resistance generated by these resistors.
Figure 5-207 shows the relationship between paper width and outputs of the variable
resistors. You must enter the basic values whenever you have replaced the DC controller
PCB or any of the sensors to ensure that the relationship remains correct.
Figure 5-207
5-8
CHAPTER 5 PICK-UP/FEEDING SYSTEM
COPYRIGHT © 1997 CANON INC. CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
STMTR
A4R
A4/A3
Paper width
STMTR
(139.7mm)
A4R
(210mm)
A4
(297mm)
Variable resistor output
Содержание NP6330
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