Ricoh FT4215, Service Training Manual

Page: 90 / 208

10.2 FRR FEED SYSTEM
This copier uses an FRR (Feed + Reverse Roller) paper feed system which
utilizes three rollers.
10.2.1 Pick-up Roller
The pick-up roller [A] is not in contact with the paper stack before it starts
feeding paper. Shortly after the Start key is pressed, the pick-up roller drops
down and feeds the top sheet between the feed [B] and the reverse rollers
[C]. At almost the same time that the paper’s leading edge arrives at the feed
roller, the pick-up roller lifts off the paper stack so that it does not interfere
with the operation of the feed and reverse rollers. The feed and reverse
rollers then take over the paper feed process.
10.2.2 Feed and Reverse Rollers
There is a one-way bearing inside the feed roller so it can turn only in one
direction. The reverse roller is driven in the opposite direction to the feed
roller. The reverse roller, however, is driven through a slip clutch (torque
limiter clutch) which allows it to turn in either direction depending on the
friction between the rollers. A spring keeps the reverse roller in contact with
the feed roller.
[B]
[A]
[C]
FT4220/4222 2-59 STM