Riso MZ1070, Technical Manual, Page: 26 / 150

[ 4-2 ] MZ870 / MZ890 / MZ1070 / MZ1090 (Revision 0.9)
FIRST PAPER FEED SECTION
Initial Paper Feed Operation
At the start of a print job, the main motor switches ON and rotates the print drum via Timing belt and
drives the Print drum pulley.
The paper feed clutch gear rotates continuously when the main motor is ON.
When the print drum rotates from position-B to a certain angle (angle set by adjusting the paper feed
clutch ON angle during test mode or by the custom paper feed ON timing), the paper feed clutch switches
ON, turning the scraper and pickup roller and transporting paper from the paper feed tray into the
machine.
When the print drum rotates through
a certain angle (angle set by adjusting the paper feed clutch OFF
angle in test mode or by the amount of slack set during custom paper feed adjustment) after the paper is
fed into the machine and the paper sensor senses light, the paper feed clutch switches OFF, and the first
paper feed operation stops.
In this process, the leading edge of the paper contacts the guide roller and timing roller. When paper
transport stops, some slack is left in the paper.
Additionally, when the print drum rotates to the paper feed jam detection angle/IN angle after the paper
feed clutch switches ON, the machine polls the paper sensor for a paper failure feed error.
The scraper and pickup roller are equipped with a one-way clutch to enable free rotation and to keep the
first paper feed section from halting or slowing paper feeding after the paper is fed to the second paper
feed section.
Main motor
Drum pulley
Paper feed clutch
Pickup roller
Scraper
Scraper
Pickup roller
Paper sensor (receive)
Paper sensor (light emitter)
Stripper pad
Guide roller
Timing roller