Paper Length Detection (Paper Feed Station) - Ricoh Robin Service Manual

24 June 1994

9.3 PAPER LENGTH DETECTION (Paper Feed Station)

The paper length is measured by the registration sensor and is stored in
memory while paper is fed past the registration sensor. This is performed
only during the first copy after the following actions:
1. When the main switch is turned on.
2. When the front cover is opened and closed.
3. When the paper tray is opened and closed.
The previous paper length is also cleared from memory by the above actions.
As shown by the following table, the CPU determines the size of the paper in
the paper tray based on the paper length measured by the registration
sensor.
Paper length (mm)
364
356
330
297
279
267
257
254
216
210
Since the CPU does not have the paper length in memory for the first copy
cycle, the CPU controls the machine for the maximum paper size of B4 (257
mm x 364 mm).
From the second copy cycle on, the CPU controls the machine for the correct
paper size based on the data stored during the first paper cycle.
Whenever the by-pass feed table is used, the CPU determines the paper size
to be B4 (257 mm x 364 mm).
PAPER FEED AND REGISTRATION
Paper size
B4
10" x 14"
8 " x 13"
1/2
A4R
8 " x 11"
1/2
8" x 10 "
1/2
B5R
8" x 10"
5 " x 8 "
1/2 1/2
A5R
2-49