How does double-feed detection work on the Canon CR-180?
According to Canon USA, all 4 generations of the CR-180 support double
feed detection. The expected behavior for a generation 1, 2, or 3
CR-180, which do not have LED sensors, is the same as a generation 4
transport with LED sensors for double feed detection:
The first item fed into the track is used as a thickness reference for subsequent items in that same batch until the transport returned to the ready to feed state. Scanning items thicker than the first one will cause a double feed detection to be reported. Once the item that causes a double feed detection is removed from the track and scanned again as the first item of a new batch, the item will not cause a double feed detection. The above behavior should occur with the following settings, found in the CR180Options.ini, in place:
The first item fed into the track is used as a thickness reference for subsequent items in that same batch until the transport returned to the ready to feed state. Scanning items thicker than the first one will cause a double feed detection to be reported. Once the item that causes a double feed detection is removed from the track and scanned again as the first item of a new batch, the item will not cause a double feed detection. The above behavior should occur with the following settings, found in the CR180Options.ini, in place:
- [General]
- DoubleFeedDetectThickness=true
- DFDThicknessReference=0
- DFDThicknessReferenceMin=0
However,
if the behavior above is not seen, both DFDThicknessReference and
DFDThicknessReferenceMin may have to be adjusted. Based on internal
testing, adjusting the DFDThicknessReference to 400 or higher can be
used as a reference of thickness for personal checks. However, this is
simply a guideline. According to the CR-180 API documentation, the
thickness reference can range from 0 to 65535; there are no specified
ranges.
Please note that by changing the reference from
automatic detection, with the value set to 0, to manual, you may see a
difference in double feeding detection performance. By changing the
value, any items scanned thicker than the reference set will be stopped;
this applies to the first item in the batch as well as subsequent ones.
Furthermore,
if the automatic setting, where both DFDThicknessReference and
DFDThicknessReferenceMin are set to '0', does not provide any double
feed detection, it may be possible that the transport(s) require
maintenance. The adjustment of these settings should only be temporary
until a Canon representative is contacted because it is possible that a
mechanical problem with the sensors exists.
According to the
native Canon API documentation, the following document types may cause
unexpected double feed detection results on transports equipped with LED
sensors because the infrared beam cannot pass through them: thick,
colored, and glossy documents. If unexpected double feed detection
occurs when scanning such documents, double feed detection may have to
be turned off when re-scanning these documents. This is the case if the
unexpected behavior occurs frequently. Furthermore, adjustments to the
values of either the DFDThicknessReference setting or the
DFDThicknessReferenceMin setting will not resolve the issue.
In
regards to 'DoubleFeedDetectLength', the behavior is a little different
than the one seen when detecting double feeds based on thickness. When
'DoubleFeedDetectThickness' is used, the first item scanned is used as a
reference for subsequent items as the thickest item allowed. When
'DoubleFeedDetectLength' is used, the length of the first item is used
as a reference to subsequent items where both shorter or longer items
scanned after this item will trigger the double feed detection warning.
Unlike 'DoubleFeedDetectThickness', the double feed detection based on
length does not have corresponding settings.
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