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CHAPTER 7: PRESS SECTION
Mechanism
1. Press Mechanism
At the start of a printing job, the pressure solenoid turns ON when the print drum rotates to a given angle, and
tries to unhook the solenoid lever away from the pressure lever;cam which is still engaged until the print drum
makes further rotation.
As the print drum continues to rotate, the cam follower on the pressure shaft;cam start to ride on the high
portion of the pressure cam, making the pressure lever;cam to swing in the clockwise direction with its pivot on
the pressure shaft. As the lever starts to ride on the highest point on the cam, it touches and starts to swing
the pressure lever;spring in the clockwise direction. As the pressure lever;spring swings in the clockwise
direction with the pivot at the pressure shaft, the solenoid lever disengages and allows the pressure solenoid to
pull the solenoid lever further in, completely disengaging it from the pressure lever:spring.
As the print drum rotates further, the pressure lever;cam starts to ride on the lower portion of the pressure cam,
causing the lever to swing back in the counterclockwise direction. The pressure lever;spring, freed from the
pressure lever;cam, is pulled by the pressure spring to rotates in the counterclockwise direction, rotating the
pressure shaft in the counterclockwise direction together. The counterclockwise direction rotation of the
pressure shaft lifts the pressure roller up and press against the print drum.
When the clamp base plate of the print drum approaches the pressure roller, the pressure cam pushes the
pressure lever;cam in the clockwise direction and lowers the pressure roller so the roller does not hit the clamp
plate.
The pressure solenoid is kept ON all through the printing job. The solenoid goes OFF when the print drum
comes to a given angle at the end of the printing job.
Pressure lever;spring
Pressure spring
Pressure solenoid
DANKA AUSTRALIA PTY. LTD.
Clamp plate base
Pressure cam
Solenoid lever
Main motor
[ 7 - 2 ] - Rev. 0.2
Print drum
Pressure lever;cam
Pressure shaft
0701
RZ9 Series
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