Canon CP660 Service Manual page 176

CHAPTER 5 PICK-UP/FEEDING SYSTEM
4. Preventing Double Feeding
The printer unit uses a separation roller to prevent double feeding when pick-up is
from the cassette. The separation roller is subjected to a rotating force opposite the rota-
tion of the feeding roller. The separation roller is equipped with a torque limiter, and the
rotation of the feeding roller 1 from the moving paper normally forces the separation roller
to rotate. In the case of double feeding, however, the weak friction between two sheets of
paper makes the rotating force going to the separation roller weak, causing the rotation
of the separation roller to move back the extra sheet.
Paper
Normal
Double feeding
5-14
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Feeding roller 1
Pick-up roller
Separation roller
(drive from the pick-up roller
through a torque limiter)
Figure 5-211
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
(drive from the feeding
roller 1)