Riso V8000 Series, Technical Manual

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[8 - 3]
CHAPTER 8. PRINT DRUM SECTION
4. Print Drum Removal/Insertion Mechanism
The print drum is removed and inserted with the print drum at position B.
When removing the print drum from the machine, the B position is 13° print drum turn from the position in
which the position B lock confirmation sensor on the print drum detects the position A detection plate.
In engaging the print drum with the machine after inserting the print drum, the position B is determined by
the angle of the paper drum. Detected by the paper drum angle, position B is 113° for the 1st print drum
and 203° for the 2nd print drum. The position B lock confirmation sensor located next to the rear position
A sensor confirms that the print drum is at position B.
When removing the print drums, the current vertical and horizontal positions of the print drums are saved
in the memory so that the print drums can be returned to their original positions when reinserted.
Then the print drum is moved all the way forward using the drum horizontal motor (position checked with
drive release sensor) and disengage the print drum engagement pin from the drive joint on the machine
to prevent the print drum from being rotated by the machine drive unit.
With the push of the START key to start printing after the reinsertion of the print drums, the drive unit on the
machine is moved to the B postion. Then the print drums are moved to the horizontal HP sensor position
by the drum horizontal motor, and then the print drum is engaged with the drive unit on the machine. Once
it is engaged with the machine and if the recall button is pressed, the print drums return to the vertical and
horizontal positions saved in the memory.
5. Master on Drum (Before Printing) Check Mechanism
On starting printing, the master loading sensor confirms that there is a master on the print drum. The
printing drum in the 1st print drum position is checked by the 1st master loading sensor and the 2nd print
drum position print drum is checked by the 2nd master loading sensor.
The paper drum angle check positions for the master loading sensors are 328° for the 1st print drum and
298° for the 2nd print drum, both print drum angles measured from the print drum position A.
Master detection is memorized until the Drum is removed or power is turned OFF.
1st master loading sensor 2nd master loading sensor
P08001
P08002
View with the 2nd master removal unit dismounted.