4.
Double feed Prevention Mechanism
The unit is equipped with a separation roller system to prevent double feed during
cassette paper feed. Normally, the separation roller applies torque in the opposite direc-
tion of the Pick up/Feeding roller. However, the separation roller is equipped with a torque
limiter so that it rotates through torque transmitted from Pick up/Feeding roller via the
paper. However, when double feeding occurs, the torque supplied by the Pick up/Feeding
roller to the separation roller through the paper becomes very weak, since the amount of
friction between the two sheets of paper is low. Then, the torque of the separation roller
returns the extra sheet.
Figure 2-211
CHAPTER 2 OPERATION OVERVIEW
2-17
COPYRIGHT © 1999 CANON INC.
CANON 2
×
500 SHEET PAPER DECK-C1 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Normal feed
Double feed
Paper
Pick up roller
Pick up/Feeding roller
Separation roller
Torque transmitted
from Pick up/
Feeding roller
Torque transmitted by the drive motor via a
torque limiter
