COPYRIGHT © CANON ELECTRONICS INC. 2008 CANON DR-X10C FIRST EDITION 2-17CHAPTER 2 FUNCTION & OPERATIONThen the double feed retry is describedbelow. If the double feed retry function is notdisabled, the feeding of the document stopswhen a double feed is detected by the ultra-sonic sensor. The document is returned to thepickup inlet by rotating the rollers in the re-verse direction. The motor that drives therollers located where the document stops canbe rotated in the reverse direction.If there are no reverse rollers, the feedingforce is not stable and the document may beskewed or jammed when it is returned. Incase of ordinary feeding, the reverse roller isnot necessary, so it is at the upper position,and does not touch the document. When re-turning the document, the reverse roller ismoved downward.However, if a double feed is detected afterthe document is fed backward 100 mm ormore from the registration sensor (rear), thedouble feed retry is not carried out.Ultrasonic sensorRegistration rollerReading roller (front)Feed rollerRetard rollerFigure 2-304Then, a side view when the reverse rollermoves upward and downward is shown below.When the reverse motor rotates, the sensorlever {1 rotates. The sensor lever is inte-grated with the cam {2 . Since this cam sur-face is in contact with the surface of themounting plate {3 of the reverse roller, whenthe sensor lever rotates, the mounting platerotates and the reverse roller {4 lowers.Reverse roller is up.Sensor leverCamReverse rollerClearanceReverse roller is down.MountingplateRotationSensor leverMountingplateCamReverse rollerFigure 2-305
