COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)4. Preventing Double FeedingThe printer unit uses a separation roller to prevent double feeding when pick-up isfrom 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 therotation of the feeding roller 1 from the moving paper normally forces the separation rollerto rotate. In the case of double feeding, however, the weak friction between two sheets ofpaper makes the rotating force going to the separation roller weak, causing the rotationof the separation roller to move back the extra sheet.Figure 5-211CHAPTER 5 PICK-UP/FEEDING SYSTEM5-14NormalDouble feedingPaperPick-up rollerFeeding roller 1Separation roller(drive from the feedingroller 1)(drive from the pick-up rollerthrough a torque limiter)Download free service manual at http://printer1.blogspot.com
