Fujitsu SP-1120N Operator's Manual page 60

Paper Size
When a mixed batch with different sizes is scanned, not feeding the documents straight may cause
troubles such as paper jams or part of the image to appear missing.
It is recommended that you check the scanned images if the documents were fed skewed.
ATTENTION
When a mixed batch with different sizes is scanned, documents are more likely to skew because the
side guides do not fit every sheet properly.
Combinations of Standard Paper Sizes in a Mixed Batch
Refer to the table below for a guideline of the range available for mixed batch scanning.
LTR:Letter size
*1: The following figure shows how to set the widest and the narrowest documents of the batch
between the side guides.
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How to Load Documents