Riso RZ5 Series, Technical Manual, Page: 38 / 410

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CHAPTER 4: FIRST PAPER FEED SECTION
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4. First Paper Feed Drive Mechanism
When the Start key is pressed for a printing job, the Main motor activates and the drive is transferred by the
main belt to rotate the print drum.
When the print drum rotates to a certain angle from the position-A, the paper feed clutch activates and rotates
the scraper and the pickup rollers, sending the paper on the paper feed tray into the machine.
As the paper is fed into the machine, the leading edge of the paper blocks the light path of the paper sensor.
At a certain drum angle from when the light path of the paper sensor is cut, the paper feed clutch deactivates
and finishes the first paper feeding action. When the first paper feeding ends, the leading edge of the paper is
hitting against the timing roller and guide roller (the two rollers are touching each other and blocking the paper
path), and makes a buckle at the tip.
At the same time the paper feed clutch activates, the paper sensor checks whether the paper is picked up from
the paper feed tray or not. If the paper sensor does not detect the paper coming into the machine, it is judged
that no first paper feeding was made and shows paper jam message.
Both the scraper roller and pickup roller have built-in one-way bearing for a free rotation, allowing the paper to
be picked up by the second paper feed mechanism without the drag of the first paper feed area.
Main belt
Guide roller
Paper feed clutch
Pickup roller
Paper sensor
Scraper roller
Timing roller
Main motor
Pickup roller
Scraper roller
Stripper pad
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