Ricoh DD5450 Field Service Manual page 148

Chapter 3 Press Section
5
● The press roller is ON (the press roller is pressed to the drum) and OFF by operating the press
lever up and down with the cam inside the drum gear.
●
Press roller: OFF
Cam
Press lever
Press roller
Press roller sensor
Emergency signal solenoid
Signal solenoid
Cancel lever- 1, 2
●
Normal condition
When the lead edge of the paper goes through under the paper lead edge and reaches the signal
sensor within a certain time, the signal solenoid of the cancel lever-2 operates to lift the press roller.
Abnormal condition
When the lead edge of a paper does not go through the paper top detect sensor or it does not
reach the signal sensor within a certain time, the emergency signal solenoid of the cancel lever-1
prevents the press roller from lifting. This prevents the press roller from ink adherence.
● Adjusting the printing area means that the
cam curve goes up and down as shown in the
illustration on the right.
The timing of drum ON/OFF varies depending
on the cam curve's up and down.
The ON position is before the drum hole
section, so the printing area is not influenced.
(Do not shorten the printing area length as it it
influenced.)
The OFF position is only changed and the
printing area is adjusted.
IMPORTANT
Do not press OFF later than the hole section end
position due to ink leakage from the rear end of
the master.
146
●
Press roller: ON
Cancel lever-1,2
Printing area
● Printing area
Press ON position
Press OFF position
Drum hole
section end
DD5450
: 423mm
DD5440
: 355mm
Printing
area
Drum hole
section start