Identifying The Size Of Copy Paper In The Cassette (Cassette4 Only); Identifying The Size Of Copy Paper In The Cassette (Cassette 4 Only); Outline; Identifying The Size Of Copy Paper - Canon NP6260 Service Manual

CHAPTER 5 PICK-UP/FEEDING SYSTEM
C. Identifying the Size of Copy Paper in the Cassette (Cassette 4
only)

1. Outline

The size of the copy paper inside the cassette is identified by the paper size sensor
mounted to the rear of the cassette holder.
When the cassette is slid into the cassette holder, the paper size sensor is pushed
by the boss on the cassette and turns on, thereby enabling identification of the width and
the length of the copy paper.
The copier uses combinations of widths and lengths of copy paper to find out the size
of the copy paper, and determines where to reverse the scanner and how to control the
blanking exposure mechanism.
The boss used to push the paper size sensor operates in conjunction with the guide
plate inside the cassette, and its position is set when the guide plate is set to suit the
copy paper.

2. Identifying the Size of Copy Paper

The copy paper length sensor consists of two photointerrupters, and the length is
identified with reference to combinations of the outputs of these two sensors.
The paper width sensor, on the other hand, is a variable resistor, and the resistance
output of the sensor is used to identify the width of paper.
Figure 5-206 shows the relationship between paper widths and variable resistor out-
puts. You must register the correct basic settings whenever you have replaced the DC
controller PCB or the sensor so that the relationship may be maintained. (See Chapter
11 "Registering the Paper Width Basic Value.")
5-8
COPYRIGHT © 1997 CANON INC.
A4/A3
A4R
STMT-R
STMT-R
(139.7mm)
Paper width
Figure 5-206
CANON NP6560/NP6360/NP6260 REV. 0 NOV. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
A4R A4
(210mm) (297mm)