Exposure; Paper And Original Feed (A252 Only) - Ricoh FW780 Service Manual

EXPOSURE

2.3 EXPOSURE

2.3.2 PAPER AND ORIGINAL FEED (A252 ONLY)

[B]
[C]
[G]
A252D500.WMF
In this machine (A252 copier), first, the leading edge [A] of the original is inserted
into the original table and the original is delivered to the appropriate start position.
Then the original is switched back while it is being scanned. Therefore, the original
is scanned from the trailing edge to the leading edge.
When an original is placed on the original table, it activates the original entrance
sensor [B]. The main motor starts rotating and the quenching lamp, development
bias, and PTL begin. Then, the exposure lamp turns on. To ensure correct original
feeding (especially for a thin original), the original is returned toward the operator
side (300 ms) before the original feed. Thus the original will be fed evenly by each
roller on the original entrance roller [C].
4 seconds after the original entrance sensor is activated, the original feed motor
starts rotating 200 mm/s to turn the original entrance rollers [C] and the original
rear rollers [J]. The original is delivered to the original feed start position [D]. The 4
second delay allows time for the operator to align the trailing edge (non-operator
side) against the first set of the rollers (to prevent skewing).
A251/A252
26 mm
[H]
15 mm
J: Original Rear Roller
K: Original Rear Sensor
2-2
[D]
[J]
[K]
[F]
[I]
[A]
[E]
A252D501.WMF
SM