Registration - Ricoh FT4430 Service Manual

16 April '88

REGISTRATION

The DF CPU stops the feed-in motor [Ml
edge of the original activates the original entrance sensor [S-35]. The
original's own forward momentum, which causes the original to align against
the registration roller [A], corrects the skew.
After a further 30 milliseconds, the DF CPU energizes the belt drive motor
[M-1 6] and the registration solenoid [S01-8]. Rotation of the belt drive motor is
transmitted to the feed belt and registration rollers via the timing belts [B and
C], belt drive gear [D], registration clutch [E], and registration roller gear.
The DF CPU starts counting the pulses from Ml 6 when the leading edge of
the original activates the registration sensor [S-37]. When the pulse count
reaches 1,962 pulses (about 940 ins), the original is at the proper position,
and the DF CPU stops M16.
In Auto Paper Selection or Auto R/E mode, the ADF automatically determines
the original size. The registration sensor and the original width sensor [S-36]
measure the original size. The registration sensor measures the length of the
original by counting the Ml 6
the original size cannot be determined from the length alone, the CPU checks
whether the original has actuated the original width sensor. Based on the
input from these two sensors, the correct original size can be determined.
The registration sensor is also a jam detector.
30 milliseconds after the leading
4]
the original passes under it. Then, if
pulses as
7-10