I. PICK-UP/FEEDING SYSTEMA. OutlineThe copier uses center reference, in which copy paper is moved along the center ofthe pick-up/feeding path, thereby ensuring stable pick-up feeding operations.The pick-up system consists of the paper deck, cassettes, and multifeeder assembly;in addition, the system includes the holding tray assembly and the holding tray feedingassembly for making two-sided/overlay copies.The feeding system has two feeding paths: for one-sided copies and for two-sided/overlay copies (through the holding tray assembly and the holding tray feedingassembly), and the paths are separated by a delivery paper deflecting plate.When making a one-sided copy, the copy paper picked up from the cassette, paperdeck, or multifeeder is controlled by the registration roller so that its leading edgematches the leading edge of the image on the photosensitive drum; then, the paper isforwarded to the copy tray through the transfer, separation, feeding, fixing, and deliveryassembly.When making two-sided/overlay copies, on the other hand, the paper is stacked onthe holding tray after fixing on the first side. Then, it is picked up from the holding trayfor copying on the second side; it moves through the holding tray feeding assembly andis sent to the copy tray through the same path as one-sided copies.As many as 17 sensors are used to monitor the movement of copy paper; see Figure5-101 for the arrangement of these sensors.Table 5-101COPYRIGHT © 1997 CANON INC. CANON NP6045 REV. 1 MAR. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 5 PICK-UP/FEEDING SYSTEM5-1Sensor No. Name Sensor No. NamePS8 Holding tray feeding assembly 1 paper sensor PS24 Pick-up vertical path 0 paper sensorPS9 Holding tray feeding assembly 2 paper sensor PS27 Pick-up vertical path 3 paper sensorPS10 External delivery sensor PS30 Pick-up vertical path 4 paper sensorPS12 Internal delivery sensor (reversing assembly) PS33 Pick-up vertical path 1 paper sensorPS14 Holding tray registration paper sensor PS36 Pick-up vertical path 2 paper sensorPS15 Holding tray inlet paper sensor PS47 Fixing assembly outlet paper sensorPS17 Holding tray pick-up sensor PS49 Left deck outlet paper sensorPS22 Multifeeder pick-up sensor PS52 Claw jam sensorPS23 Registration paper sensor
