DRUM
SM 6-73 C262/C265
Detailed
Descriptions
The main motor [A] drives the drum via the timing belt. When the drum is set in the
machine, the drum drive pin [B] on the joint disk engages the drum drive gear [C].
This transmits the main motor drive to the drum unit.
The main motor [C] contains an encoder to send pulses to the main motor control
board. The CPU monitors the pulses and controls the drum speed and stop
positions. The 1st and 2nd drum position sensors [D, E] check the position of the
drum. The actuator on the rear drum flange activates these sensors as the drum
turns.
There are three drum stop positions: home, master eject, and master making. The
CPU starts counting the main motor encoder pulses when these sensors are
activated. Certain pulse counts are assigned to each drum stop position. The CPU
can stop the drum at the desired positions.
At the home and master making positions, the drum de-actuates the relevant
sensor. This ensures that the drum stops in the exact position, even after high-
speed rotation. The 1st drum position sensor corresponds to the home position and
the 2nd drum position sensor corresponds to the master making position.
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