COPYRIGHT© 2001 CANON INC.
2000 2000 2000 2000
CANON SADDLE FINISHER K3/K4 REV.0 MAR. 2001
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CHAPTER 2 OPERATION OVERVIEW
12.5.3 Folding
The paper is folded by the folding rollers and paper retaining plate.
The paper retaining plate pushes the center of the paper stack into the folding roller con-
tact position. At this time, the paper retaining plate begins the operation from the home posi-
tion and waits at the leading edge position until the paper stack has been drawn 10mm into
the folding rollers. The paper retaining plate motor then rotates in reverse and the paper re-
taining plate returns to the home position. The folded paper is then delivered to the tray by
the folding rollers and delivery rollers. Except for the centre portion, one side of each paper
folding roller is inset from the rest, in order to prevent wrinkling of the paper. On the inset
side, only the middle portions of the upper and lower paper folding rollers will come into
contact with each other, on the non-inset side, the entire surfaces of both rollers will come
into contact with each other. Bending of the paper starts from the non-inset sides, and the
paper is fed forward while being folded. In addition, the paper folding rollers are stopped at
the non-inset sides. The paper folding rollers' starting and stopping positions are controlled
by the number of clock pulses from the home position sensor (PI58).
F02-1205-02
Folding roller
(lower)
Folding roller
(upper)
Sensor flag
Paper folding home
position sensor (PI58)
Paper retaining plate leading
edge position sensor (PI56)
Paper retaining plate home
position sensor (PI55)
Paper retaining
plate
Paper retaining
plate motor
Paper folding motor
M42
M48
Paper stack
