EPSON Stylus &2/251520Rev. A2-62.2.4 Paper Feed MechanismThe paper feed mechanism of this printer consists of the integrated ASF (Auto Sheet Feeder) mechanism,tractor mechanism, PF (Paper Feed) motor, front/rear PE (Paper End) sensors, PF roller, paper guidemechanism, paper eject unit, and PF motor drive disengage mechanism. The torque from the PF motordrives the paper load mechanism, paper feed mechanism and paper eject mechanism. While the printeris not printing, the PF motor drive disengage mechanism switches the torque from the PF motor to thepump mechanism, which depends on the CR position. While the paper feed mechanism is driven, thetorque from the PF motor is transmitted via PF motor pinion gear and disengage gear to the PF roller.,where the torque is then divided into 2 directions. One is transmitted to the paper eject mechanism via thegear train in the paper guide assembly. The other is transmitted to the ASF mechanism via thetransmission gear.The tractor drive gear train is set at the left end of the PF roller. Table 2-4 and Table 2-5 shows thespecification for the PF motor and PF motor drive terms, respectively. Figure 2-5 illustrates the paper feedmechanism.Item DescriptionMotor type 4-phases / 96-pole / HB type stepping motorDrive voltage 42 VDC ± 5% (The voltage applied to the driver)Coil resistance 10 Ω ± 10% (at 25° C per 1 phase)Connection BipolarExcitation mode 2-2 phase, 1-2 phase, W1-2 phase constant current driveMinimum step 1/720 inch / step (2-2 phase drive)OperationmodeAcceleration Constant Deceleration Stand-byPaper feed/LQHIHHG LQFK0.9/0.9 0.9 0.75/0.75 0.6ASF Feed 0.9/0.9 0.9 0.75/0.75 0.6Pump driven /0.9 0.9 0.9 0.6Pump driven(slow) / 0.9 / 0.6Note) Double 1-2 phase drive / 2-2 phase driveTable 2-4 PF Motor SpecificationTable 2-5 PF Motor Drive TermsTractor Disengage Gear PF MotorPF Motor Pinion GearDisengage GearTo the tractormechanism.To the ASFmechanism.ASFTransmission GearPF Drive RollerPaper Eject Roller ShaftPump MechanismPaper Eject Roller ShaftPaper Eject Roller UnitFigure 2-5. Paper Feeding Mechanism
