Riso RP-255, Technical Manual

Page: 43 / 449

MACHINE SUMMARY
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4. Outline of Paper-feeding, Printing, and Paper-ejection Operations
Pickup roller
Scraper roller
Stripper pad
Guide roller
Timing roller
Pressure roller
Separation fan
Separator
Transfer belt
(1) When the print drum rotates, the scraper roller
and pickup roller also turn to feed paper. The
stripper pad allows only one sheet to pass
through to the second paper-feed area.
(2) The paper sent from the first paper-feed area
contacts the timing roller and guide roller, and
stops temporarily. This causes slight buckling of
the paper.
(3) The timing roller and guide roller start rotating,
feeding paper to the pressure section. (This
operation is referred to as the “second paper-
feed drive.” To prevent tension from being
placed on the end of the paper, the scraper
roller and pickup roller are free to spin.)
(4) When the paper is sent from the second paper-
feed stage, the pressure roller rises to clamp the
paper between the drum and pressure roller,
and then the printing operation starts.
(5) The printed paper is removed from the print
drum by the separator and separation fan.
When the pressure roller rises, the guide roller
also moves up to prevent tension from being
placed on the end of the paper.
(6) Then, the suction fan blows air to keep the
paper firmly on the transfer belts while the paper
is carried to the paper-receiving tray.
(7) The next sheet of paper is sent to the first
paper-feed stage, and the guide roller lowers.
0202