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6.5.2 MASTER EJECT MECHANISM
Overview
Rear
[F]
Two photosensors (the 1st and 2nd drum position sensors) and the feeler on the
rear drum flange determine the drum position. The drum is at the home position
when the feeler actuates the 1st drum position sensor. At this position, the drum
master clamper, which clamps the leading edge of the master onto the drum, is
located at the bottom of the drum. (For details, refer to Drum Drive Mechanism in
the Drum section.)
The drum turns 114.5 degrees from the home position to reach the master eject
position (there is no sensor for master eject position detection – main motor
encoder pulses only). As soon as the drum stops, the clamper motor [B] starts to
open the drum master clamper [F]. The master pick-up roller [D] moves against the
drum at the same time, because it is connected through an idle gear.
A link plate connects the drum guide [E] to the clamper opening arm [A]. So, when
the arm moves, the drum guide also moves, and this locks the drum position.
NOTE:
1) To lock the drum, the drum guide catches one of two studs at
different positions on the drum. The drum guide catches one stud at
the master eject position [C], and the other stud at the master
making position.
2) The drum master clamper also opens when the drum is at the
master making position. However, it uses a different clamper-
opening arm. For details, refer to the Master Making section.
3) Do not clean the inside of the master clamper with alcohol or other
strong solvents. Use a cloth dampened with water. This prevents the
magnetic force from weakening. This part requires periodic cleaning.
SM
[A]
[D]
[E]
6-25
MASTER EJECT
[B]
[C]
Front
C262D013.WMF
C262/C265
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