Ricoh A028 Service Training Manual page 18

1 July 1994
*2:
"Paper Feed Timing" shows the timing when each paper is fed from the LCT. The numbers
correspond to the number of the original which will be copied on the front side of the paper.
The chart shows only odd number because the even numbered originals are copied on the reverse
side of the paper.
The paper feed start timing is different when paper is fed from the LCT, 1st tray, 2nd tray, and 3rd
tray. This is because paper transportation takes more time depending on where the paper feed
starts and where images are transferred to the paper. The time for the LCT is the longest and that
for the 3rd tray is the shortest. If the paper is fed from a station other than the LCT, the paper for the
first original starts being fed as shown in the dotted lines. The following paper feed intervals are the
same as that for the LCT.
*3:
"Duplex Tray Entry Timing" shows when the paper activates the duplex entrance junction sensor
and is delivered to the duplex tray. The number on top of each entry timing corresponds to the
number of the original which has been copied on the front side of the paper.
*4:
"Duplex Feed Timing" shows when the paper for each original is fed from the duplex tray. The
number on top of each duplex feed timing correspond to the number of the original which will be
copied on the reverse side of the paper.
As the timing chart shows, during the first original feed cycle only the odd numbered originals are
copied onto the paper fed from the paper tray. During the 2nd cycle the odd numbered originals are
copied as in the first cycle, and also even numbered originals are copied onto the paper fed from
the duplex tray. Copying for the front and reverse sides is done alternately in this period. (This is the
alternate paper feeding.) For the 3rd original feed cycle (i.e. the last original feed cycle) only the
even numbered originals are copied onto the paper from the duplex tray, completing the copy run
(two sets of five duplex copies are completed).
*5:
When the LCT is used the original to be copied starts being fed from the stack original feed table
and the paper for it starts being fed from the LCT right away.
During the first original feeding cycle, the 2nd original (and also the following even numbered
originals) is just fed and returned without being copied. During the 2nd cycle, all originals are
copied. Finally during the last original feed cycle, only the even numbered originals are copied.
*6:
The copy of the first original enters the duplex tray just after the 10th (last) original starts being fed
and before the first original starts being fed for the 2nd feed cycle. This duplex tray entry timing for
the first copy does not depend on the paper being fed from the LCT, first tray, 2nd tray, or 3rd tray.
This is because the time for the paper to enter the duplex tray after images are transferred to the
paper is constant no matter where paper is fed from.
Just after the 3rd paper has entered the duplex tray, the paper which first entered in the duplex tray
starts being fed from the duplex tray in order to match with the copying for the 2nd original during
the 2nd feeding cycle.
*7:
The 2nd copy of the first original enters the duplex tray just before the first original starts being fed
for the last original feed cycle. When this happens, the last copy in the duplex tray just starts being
fed. This means that
when the first copy made during the next original feed cycle enters the duplex tray and if the
number of originals is 10 or less (as in this case) then the duplex tray is empty even in the
alternate paper feeding motion.
*8:
The right timing chart shows simplex original to duplex copying using 20 originals. There are copies
remaining in the duplex tray (approximately 6 copies in this case) when the first copy made during
the next original feed cycle enters the duplex tray.
This chart also shows that the copy of the first original enters the duplex tray just after the 10th
original starts being fed, as in the left timing chart.
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Outline of Mechanism