Riso V8000 Series, Technical Manual

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CHAPTER 3. MAIN DRIVE SECTION
Mechanism
1. Main Drive Section Rotating Mechanism
The print drum and paper drum are rotated for normal use by the main motor. The main motor limit
sensor (encoder sensor) detects the main motor speed and the amount of rotation and verifies stable
motor operations.
The free rotation of the main motor can be controlled using the switch on the mechanical control PCB.
The main pulse motor is used when ultra-low-speed rotation of the print drum or paper drum is required,
for applications such as corrections for master loading or the print drum stop position, in which case the
main clutch is applied. When the main motor is used to drive the print drum or paper drum, the main
clutch is released to remove the load from the main pulse motor.
The following parts are driven by the main motor via gears and cams.
Paper drum: Paper drum rotation and opening/closing of sheet gripper
Print drum: Print drum rotation, and vertical movement and rotation of inner pressure
roller
First paper feed section: Rotation of pickup roller and scraper, and air pump operation
Second paper feed section: Rotation of timing roller, vertical movement of guide roller, and vertical
movement of paper feed variable guide.
2nd print drum drive unit
1st print drum drive unit
Print drum drive gear
Print drum drive gear
Paper drum gear
Intermediate gear
Main motor gear
Paper intermediate gear Pump gear
Paper feed clutch
Guide gear
S0301
The position in which the markings on gears are all aligned
(Paper drum at 180 degrees from the T-position)