Ricoh DD 5450, Field Service Manual, Page: 128 / 403

３
126
Chapter 3 Paper Feed Section
3 Paper Feed Section
1. Description
Paper feeding is performed by the paper separator (employing the center separation method) and
paper feed roller. Elevation of the feed tray is powered by the elevator motor. The paper top
detect sensor is installed at the rear of the paper feed roller. If the paper does not reach the paper
top detect sensor or the signal sensor due to drum rotation without paper, "
MASTER SET ERROR "
is displayed.
Paper fed by the paper separator and the paper feed rollers is fed further by the timing roller (T roll)
and the guide roller (G roll) to the point where its lead edge is sandwiched between the drum and
the press roller. Then the pressure of the timing roller and the guide roller is released (by moving
the guide roller upward several millimeters), so that the paper is fed through at a speed equal to the
circumferential speed of the drum and the press roller.
For details, see “1.Paper Jam Detection Timing” in chapter 2 (6.Paper Ejection Section).
→See Page 156
Vertical registration section
Vertical reg. center sensor
Vertical reg. encoder sensor
Vertical reg. limit sensor
Vertical reg. Motor
Elevator motor
Elevator lower
limit switch
Paper feed roller
Emergency signal solenoid
Signal solenoid
Paper separator
Side paper separator
Side paper separator
Paper sensor
Potentiometer *
Paper length sensor *
Support tray
Elevator top
limit sensor
Paper top detect sensor
Timing roller
Press roller
Press roller sensor
Signal sensor
Paper feed stepping motor
Guide roller
3