Riso V8000 Series, Техническое руководство, Страница: 128 / 362

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CHAPTER 8. PRINT DRUM SECTION
Mechanism
1. Print Drum Layout and Angle
The two interchangeable print drums have the identical construction. When mounted in the machine, the
drum closest to the paper feed side is called the 1st print drum, while the one at the paper ejection side is
called the 2nd print drum.
The two print drums are arranged in a V-shape at an angle of 45° on either side of the center of the paper
drum. This enables simultaneous printing of two colors onto a single sheet of paper.
With the print drums mounted in the machine, the print drum position in which the clamp plate base is
located at the top of the print drum is called position A, while the position for removing the print drum is
called position B.
As described above, the two print drums are arranged in a V-shape at 45° to the paper drum to print two
colors simultaneously onto a single sheet of paper. The two print drums are therefore mechanically out of
phase by 90° during printing.
Position A sensors are positioned at the front and rear of the print drums. When the print drum is used as
the 1st print drum, sensor No.1 (rear sensor) is used, and when the print drum is used as the 2nd print
drum, sensor No.2 (front sensor) is used.
When the print drums are completely removed (and placed for example on the floor), the clamp plates for
both the 1st and 2nd print drums move to their topmost positions. The position B lock confirmation
sensor, located next to the rear position A sensor and blocked by the position A sensor detection plate,
confirms that the print drum is at position B for print drum removal.
When the print drums are reinserted into the machine, it is the paper drum position which determines the
position B on the machine drive unit, enabling the print drum to engage with the machine drive unit.
2. Print Drum Retaining Joint Mechanism
When the print drums are inserted into the machine, the drum positioning block on the front of the print
drum engages with the pin holder on the machine to retain it. At the rear of the print drum, drum
positioning pin R engages with the pin holder on the machine to retain it.
At the rear (drive end), the drum engagement pin engages with the paper drum drive joint on the main unit
to transmit rotary drive from the main unit to the print drum.
The print drum is locked by the print drum locking mechanism.
Whether the print drums are inserted in the machine or not is detected by the print drum set sensor, print
drum lock position sensor, and drum drawer connector.
3. Print Drum Horizontal Movement Mechanism
The printing position is adjusted horizontally by moving the drum unit horizontally using the drum
horizontal pulse motor. The horizontal home position is detected by the horizontal centering HP sensor.