Making Overlay Copies; Operation - Canon GP335 Service Manual

CHAPTER 7 PICK-UP/FEEDING SYSTEM
H. Making Overlay Copies
The machine makes overlay copies using its image memory, and uses the paper path it uses
when making single-sided copies.
For details, see "Image Processing System."
I. Operation
1. Outline
Figure 7-129 shows the paper path the machine uses when making double-sided copies.
In copying on the first side of a double-sided copy, the paper is moved to the left vertical path
assembly by the delivery flapper after it has moved through the fixing assembly. When the trailing
edge of the paper moves past the reversing assembly inlet sensor (PS6) and reaches a specific
position (point of reversal), the duplexing reversing roller starts to rotate in reverse to move the
paper to the lower feeding assembly.
When copying on the first side and the last side, the paper is not retained in the lower feeding
assembly but is re-picked up.
Otherwise, the paper is retained in the lower feeding assembly until the trailing edge of the next
paper moves past the vertical path sensor (PS11); it is then re-picked up after a specific time.
The point of retention is a specific position controller with reference to the output of the re-pick
up paper sensor.
Duplexing
reversal point
Duplexing
reversing roller
7-28
SL2
PS7
PS6
PS8
Figure 7-129
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
PS9
PS11
Print of retention
PS4
PS3