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OMR glossary
Errors
Jam
A paper jam error caused by media when paper is being fed.
There are two kinds of jams: static jams detected when the device is at rest, and
operational jams is detected while the device is running.
Operational jams include double-feeding jams and no-feeding jams.
Skew
Refers to paper that is slanted against the paper feeding standard.
This function detects whether or not paper is fed straight.
Perforated paper, paper unevenly cut, and curled or bent paper is likely cause
skew errors.
No feed
Refers to paper doesn’t get fed during paper feeding operations.
If such an error occurs, the device assesses it as a paper feeding error, and
notifies user of the error.
Double-feeding
Refers to two or more sheets being fed at the same time during paper feeding
operation. If such an error occurs, the device assesses it as a paper feeding error,
and notifies users of the error.
Mark to mark type
If paper has pre-printed timing marks, the scanning area (reading area) of targeted
mark frames will be determined by such timing marks.
Mark to mark type is a method to read zones between two timing marks.
Therefore, the number of timing marks in mark to mark type sheets is always an
even number. Other methods include timing control type, direct under type, and
FACOM type.
2.5mm
Between timing marks
first row
Top margin
second and subsequent rows
Between timing marks
• Mark to mark type
(without top-end margin reading):
The reading zone is the area between
timing marks.
• Mark to mark type
(with top-end margin reading):
The reading zones are the front margin of
the sheet as the first row, and between
timing marks as the second and
subsequent rows.
Reading zone
