Ricoh FT4215, Service Training Manual

Page: 104 / 208

10.9 PAPER REGISTRATION
Main motor rotation is transmitted to the timing belt [A] through a series of
gears. The timing belt rotate the relay gear [B] and then the registration roller
clutch gear [C]. When the registration clutch [D] is energized, the rotation of
the clutch gear is transmitted to the lower registration roller [E].
The registration rollers can be rotated by a knob in the front to ease misfed
paper removal.
The registration sensor [F], which is positioned just before the registration
rollers [G], controls the paper feed stop timing. The 1st paper feed clutch
stays on for 120 milliseconds and the relay roller clutch (2nd and 3rd paper
feed stations) stays on 114 milliseconds after the leading edge of paper
actuates the registration sensor. At the end of the period, the CPU turns off
the 1st paper feed clutch or the relay roller clutch. This delay allows time for
the paper to press against the registration rollers and buckle slightly to
correct skew.
The CPU energizes the registration clutch 1.4 seconds (1st feed station) after
the Start key is pressed. The registration rollers then feed the paper to the
image transfer section.
[E]
[A]
[C]
[D]
[B]
[F]
[G]
[F]
FT4220/4222 2-73 STM