Ricoh B022, Service Manual

Page: 408 / 878

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B386
MIXED ORIGINAL SIZE MODE
SM 10-9 B386
2.2 MIXED ORIGINAL SIZE MODE
This section explains what happens when the user selects mixed original size
mode.
Because this ADF is a sheet-through document feeder, the method for original
document width detection is the same as when the originals are the same size, but
the document length detection method is different. Therefore, the scanning speed
is slightly slower.
Document length detection
From when the registration sensor switches on until it switches off, the CPU counts
the transport motor pulses. The number of pulses determines the length of the
original.
Feed-in cycle
When the original size for the copy modes listed below cannot be determined, the
image cannot be correctly scaled (reduced or enlarged) or processed until the
original’s length has been accurately detected. The length must be determined
before the image is scanned.
Auto Reduce/Enlarge
Centering
Erase Center/Border
Booklet
Image Repeat
The originals follow this path:
1. Length detection
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Scanning glass
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Inverter table
2. Inverter table
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Scanning glass
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Inverter table (restores the original order)
3. Inverter table
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Scanning glass (image scanned)
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Exit tray
Normal feed-in
In a copy mode other than those listed above, when the reduction/enlargement
ratio has been determined, the originals are scanned normally. In order to store the
scanned images, a large area of memory (the detected original width x 432 mm
length) is prepared. Next, only the portion of the image up to the detected original
length is read from memory and printed.