Paper Registration - Ricoh G147 Service Manual

6.9.6 PAPER REGISTRATION

The registration drive roller [A] and idle roller [B] correct the skew of the paper to ensure that
the leading edge of the paper is positioned correctly at the drum. The paper
feed/development motor [C] drives the registration mechanism.
The registration sensor [D] is just before the registration rollers. When the leading edge
activates the registration sensor, the registration clutch is switched off and the registration
rollers stop turning. However, the relay clutch [E] remains on slightly longer. This delay
allows more time for the paper to press against the registration rollers and buckle slightly to
correct any skew. The registration sensor also detects misfeeds.
Next, the registration clutch [F] and the relay clutch turn on at the correct time to align the
paper with the image on the drum. The registration rollers then feed the paper to the image
transfer section.
Two new dust blades have been added around the registration roller. The idle roller dust
blade [G] cleans the registration idle roller. This dust blade has a small dust box that collects
paper dust that must be emptied periodically.
The registration roller dust blade [H] cleans the registration roller. For details about how to
remove and clean these new parts, see Section "3 Replacement and Adjustment".
6.9.7 PAPER SIZE DETECTION
The paper size switch includes four microswitches. Actuators behind the paper size dial
actuate the sensors.
Each paper size has its own actuator, with a unique combination of notches. To determine
the paper size, the CPU reads which switches the actuator has turned off.
The CPU disables paper feed from a tray if the paper size cannot be detected. If the paper
G147 6-40 SM