Lexmark W820 Service Manual - Page 40

4025-Finisher Punch Section • Route for paper delivery to the Stacker Tray The paper transferred from the H-Tra to the Finisher passes the Fin Input Path Sensor in the Finisher, and it is transferred toward the Shift Roller by the rotation of the Fin Input Roller and Regi Roller. After the trailing edge of the paper passes the Fin Input Path Sensor, the rotation speed of the Shift Roller decreases to reduce the paper transfer speed of the Shift Roller toward the Exit Roller. Due to the reduced paper transfer speed of the Shift Roller, a part of the paper located near the Chute Guide starts to deflect. Paper deflection is caused by the Regi Roller rotation faster than the Shift Roller rotation. The paper deflects successively by the Regi Roller, and after the specified pulses, the Punch Unit punches the paper. After the punching operation is finished, the Shift Roller rotation speed returns to normal speed to restart the paper transfer. • Route for paper delivery to the Top Tray Punching operation at the Top Tray Exit The paper transferred from the H-Tra to the Finisher passes the Fin Input Path Sensor in the Finisher, and it is transferred toward the Exit Top Gate by the rotation of the Fin Input Roller and Regi Roller. After the trailing edge of the paper passes the Fin Input Path Sensor, the rotation speed of the Exit Top Roller: Lower decreases to reduce the paper transfer speed of the Exit Top Roller: Lower toward the Exit Roller. Due to the reduced paper transfer speed of the Exit Top Roller: Lower, a part of the paper located near the Chute Guide starts to deflect. Paper deflection is caused by the Regi Roller rotation faster than the Exit Top Roller: Lower rotation. The paper deflects successively by the Regi Roller, and after the specified pulses, the Punch Unit punches the paper. After the punching operation is finished, the Exit Top Roller: Lower rotation speed returns to normal speed to restart the paper transfer. 1-28 Service Manual