Riso RP-255, Technical Manual

Page: 60 / 449

FIRST PAPER FEED SECTION
[ 4 - 3 ]
A B
F
E
D
G
C
H
I
0403
0404
2-1. Paper Feed Tray Elevation Mechanism (RN25 Series)
The presence of paper in the paper-feed tray [A] is detected by the paper-detection sensor [B].
When light is received by the paper-detection sensor [B], pressing the Start key activates the elevator
motor [F] and raises the paper-feed tray [A] until the scraper ass’y [C] blocks the light beam to upper-
limit sensor A [D] or upper-limit sensor B [E].
During printing, the elevator motor [F] remains on until the light to upper-limit sensor A [D] or upper-limit
sensor B [E] is blocked. Which upper-limit sensor is activated depends on the position of the pressure-
adjust lever (NORMAL/CARD). When the lever is placed in the “CARD” position, upper-limit sensor B is
used and the paper-feed-tray upper-limit position is higher than that for the “NORMAL” setting. The
position of the pressure-adjust lever is confirmed here by the pressure-detection sensor [I].
The upper-limit position change described above is performed when “Auto” is selected in Test Mode No.
480. If “NORMAL” or “CARD” is selected in the test mode, the paper-feed-tray upper-limit position will be
fixed irrespective of the pressure-adjust-lever position.
When no paper remains in the paper-feed tray [A] and light is not received by the paper-detection sensor
[B], the elevator motor [F] activates and lowers the paper-feed tray [A] until the light beam to the lower-
limit sensor [G] is blocked.
If the feed-tray button [H] is pressed in print standby mode, the elevator motor [F] activates and lowers
the paper-feed tray [A] until either the light beam to the lower-limit sensor [G] is blocked or the feed-tray
button [H] is pressed again.
When the drum is removed, the elevator motor [F] does not operate even if the feed-tray button [H] is
pressed.
A: Paper feed tray
B: Paper detection sensor
C: Scraper assembly
D: Upper-limit sensor A
E: Upper-limit sensor B
F: Elevator motor
G: Lower limit sensor
H: Feed tray descent button
I: Paper feed pressure
sensor