43085101TH Rev.1 25 /Oki Data CONFIDENTIAL2.2 Printing processThe paper fed from Tray 1 or Tray 2 is carried by the paper feed roller, register roller L and transportroller. When the paper is fed from the MPT, it is carried by the MPT paper feed roller and registerroller U. Then, an unfixed toner image is created on the paper transported onto the belt sequentiallythrough the electrophotographic process of KYMC. Thereafter, the image is fixed under heat andpressure as the paper goes through the fuser unit. After the image has been fixed, the paper isunloaded to the stacker either face-up or face-down stacker, according to the outputting methodselected by opening or closing the face-up stacker.While the above refers to the one-sided print operation of the printer, its operation in two-sided printwill be explained below.When two-sided print is conducted, the paper that has passed through the fuser unit following firstone-sided print is sucked into the Duplex unit by the separator DUP. After entering the paperreversal transport path, the paper is carried from there to the inside of the Duplex unit by theinverting operation of the reversal roller. Then, after passed through the Duplex unit by thetransport roller that is located on the transport path inside the Duplex unit, the paper is fed alongthe paper feed route of the Duplex unit to eventually merge the same route that comes from thetray. From here on, the same operation as that of one-sided print of paper fed from the tray takesplace.MPTMPTReversal rollerSeparator DUPFace-up stackerFace-down stackerHeat rollerHalogen lampBackup roller Transport beltRegister roller URegister roller LMPT paper feed rollerTransport rollerSubrollerSubrollerPaper feed rollerPaper feed rollerTransport rollerPaper reversal transport pathBelt
