43967002TH Rev.1 34 /Oki Data CONFIDENTIAL 2. Theory of Operation2.2 Print processThe paper that is fed from the tray 1 or tray 2 or tray 3 is transported by the feed paper roller, theregist roller L and the transport roller. When paper is fed from MTP, paper is transported by theMPT feed paper roller and the regist roller U. The paper that is transported on the belt passesthrough the electro-photographic process of KYMC and the non-diffused toner image is createdon the paper. When paper passes through the fuser unit, the toner image is fused by heat andpressure. After the toner image is fused, the paper is unloaded to the face-up stacker or theface-down stacker depending on the unloading method selected by open/close of the face-upstacker.Operation during the one-sided print is described above. Operation during the both-sided printis described below The paper that has passed through the fuser unit after the rear-side printis completed first, is transported to the Duplex unit by the separator DUP. The paper that hasentered in to the paper inverting transport path is then transported to the inside of the Duplexunit from the paper inverting transport path by the inverting movement of the inverting roller. Thepaper that has passed through the Duplex unit by the transport roller of the transport path insidethe Duplex unit, is supplied from the feed paper path of the Duplex unit so that the paper entersthe same paper transport path as the feed paper route from the trays. The remaining operationsare the same as those of the one-sided print using the paper supplied from the trays.Face-down stackerFace up stackerMPTPaper inverting transport path Sub rollerFeed rollerSub rollerTransport rollerFeed rollerRegist roller LRegist roller UMPT feed paper rollerTransport rollerTransport rollerInverting rollerSeparator DUPHeat rollerBackup rollerHalogen lamp(1) Feed paper from the 1st tray1. When the regist motor rotates (in counter-clockwise direction) while thesolenoid is activated to the ON state as shown in Fig. 2-1, the paper istransported until the IN1 sensor is turned ON. (When the solenoid is turnedON, the feed paper roller is driven.)2. When the paper turns ON the IN1 sensor, the specified amount of paper istransported so that the paper is pressed against the regist roller L. (Thus,paper skew is corrected)3. As shown in Fig. 2-2, the solenoid is turned OFF so that paper is transportedby the regist roller L. (When the solenoid is turned OFF, the regist roller L isdriven.)Regist roller U(drive)Regist roller U(drive)Hopping roller(drive)Hopping roller(stop)PaperPaperSub roller(drive)Sub roller(stop)Regist motor(Rotates in counter-clockwise direction.)Regist motor(Rotates in counter-clockwise direction.)Regist roller L(stop)Regist roller L(drive)WR sensorWR sensorSolenoid lever(Solenoid ON)Solenoid lever(Solenoid OFF)Hopping gear AssyIN2 sensorIN2 sensorIN1 sensorIN1 sensorFig. 2-1Fig. 2-2
