Riso RP-255, Technical Manual

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CHAPTER 13. AF SCANNING SECTION (RN25 Series)
5 mm
3 mm
3 mm
10 mm 55 mm
Mechanism
1. AF Original Set Mechanism
When an original is set along the original guide fence [K] and pushed up against the original stopper
gate [A], the AF original detection sensor [B] turns ON (receives light) and the Master/Print indication
on the panel changes to “Ready to make master.”
After a set length of time, the AF read pulse motor operates in the reverse direction, lowering the
pickup roller [C] in the direction indicated by the arrow and withdrawing the original stopper gate [A]
upward. (In this step, the one-way clutch incorporated between the registration-roller gear and
registration-roller shaft prevents the registration roller [D] from rotating.)
When the pickup roller [C] descends and presses against the original, the pickup roller [C] and
original stripper roller [E] rotate in the original transport direction, and a single original is fed forward
by the action of the original stripper roller [E] and the original stripper pad [F]. This activates the AF
original registration sensor [G] (light blocked), and the edge of the original is stopped by the
stationary registration roller [D].
When the AF original registration sensor [G] turns ON, after a preset length of time the AF read pulse
motor starts rotating in the forward direction. This raises the pickup roller [C] and turns the
registration roller [D], the two read rollers [H] [L], the white roller [I], and the original ejection roller [J],
all of which are linked by the timing belt, in the feed direction.
The original stops temporarily when it moves 90 mm from the original set position.
Meanwhile, when the AF original detection sensor [B] turns ON, the lamp carriage in the scanner unit
conducts a series of operations from lamp illumination to shading compensation, then moves to the
AF read position and stops in the standby mode.
If the Start key is not pressed within 60 seconds, the lamp turns off and the lamp carriage returns to
the home position. Only when the Start key is pressed, the shading compensation operation is
conducted (as well as the auto-base-control operation if the original scanning density is set to AUTO),
and the scanning operation begins.
When the Start key is pressed within 60 seconds, the scanning operation starts immediately if the
original scanning density is not set to AUTO. If it is set to AUTO, the lamp carriage returns to the
home position, and the shading-compensation and auto-base-control operations are performed
before the scanning operation starts.
Home position AF read position
AF-ABC position Shading-compensation
operation range
I
M
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