44015503TH Rev. 1 21 /Oki Data CONFIDENTIAL 2. DESCRIPTION OF OPERATION2.2 Printing processThe paper fed from Tray 1 or Tray 2 is carried by the paper feed roller, the registration roller L, andthe transport roller. When the paper is fed from the MPT, it is carried by the MPT paper feed rollerand the registration roller U. Then, an unfixed toner image is created on the paper transportedonto the belt sequentially through the electrophotographic process of KyMC. Thereafter, theimage is fixed under heat and pressure as the paper goes through the fuser unit. After the imagehas been fixed, the paper is ejected to a face-up stacker or to a face-down stacker, according tothe outputting method selected by opening or closing of the face-up stacker.While the above refers to the one-sided print operation of the printer, its operation in two-sided print will be explained below.When two-sided print is conducted, the paper that has passed through the fuser unit followingfirst one-sided print is sucked into the Duplex unit by the separator DUP. After entering the paperreverse transport path, the paper is carried from there to the inside of the Duplex unit by theinverting operation of the reverse roller. Then, after passed through the Duplex unit by the transportroller that is located on the transport path inside the Duplex unit, the paper is fed along the paperfeed route of the Duplex unit to eventually merge the same route that comes from the tray. Fromhere on, the same operation as that of one-sided print of paper fed from the tray takes place.Face-down stackerFace-up stackerMPTSub-rollerPaper feed rollerSub-rollerTransport rollerPaper feed rollerRegistration roller LRegistration roller UMPT paper feed rollerTransport beltTransport rollerReverse rollerSeparator DUPHeat rollerBackup rollerHalogen lampPaper reverse transport path(1) Paper fed from 1st Tray1. As illustrated in Figure 2-1, when the solenoid is ON, the registration motorrotates (counterclockwise), transporting the paper until the IN1 sensor comesON. (When the solenoid is ON, the paper feed roller is driven.)2. After causing the IN1 sensor to come ON, the paper is further carried over acertain distance to finally hit the registration roller L. (This corrects skew of thepaper.)3. As shown in Figure 2-2, the solenoid is turned OFF, and the paper is carried bythe registration roller L. (When the solenoid is OFF, the registration roller L isdriven.)Registration roller U(drive)Registration roller U(drive)Hopping roller (drive)Hopping roller (stop)PaperPaperSub-roller(drive)Sub-roller(stop)Registration motor(counterclockwise)Registration motor(counterclockwise)Registration roller L(stop)Registration roller L(drive)WR sensorWR sensorSolenoid lever(solenoid: ON)Solenoid lever(solenoid: OFF)Hopping gear AssyIN2 sensorIN2 sensorIN1 sensorIN1 sensorFigure 2-1Figure 2-2
