paper passes the registration roller and detecting the border between the background and paper
in the image. (Paper alignment is performed based on the detected positional information.)
In the image data scanned by the CIS, the value is low for the background area without paper and
high for the area with paper, so the position exceeding the threshold is detected as the paper
edge.
The value is higher for white paper with high reflectance, and the difference between the
background and the paper portion will be large, making the edge position easily detectable. On
the other hand, for paper with low reflectance (colored paper, black paper, transparencies, etc.),
the value for the paper portion is lower, making it difficult to detect the paper edge.
Related Advanced Settings
page 51 "Paper Edge Detection"
Double-feed detection mechanism
Double-feed detection prevents unwanted blank sheets from mixing in the job to minimize inspection
time for high productivity.
Double-feeds are detected by reading the difference in the ultrasonic intensity between one sheet and
two or more sheets. The function also works for colored media and transparencies.
When detected, the machine alerts jam code J099.
Related Advanced Settings
page 50 "Detect JAM099"
Sub scan registration mechanism
After correcting the main scan registration, the sheet passes through the transfer timing roller [2] and the
transfer timing sensor [1] detects the leading edge of the sheet.
The rotation speed of the transfer timing roller [2] is adjusted according to the timing the leading edge is
detected, to deliver the paper for the belt-to-paper transfer process at the perfect timing.
If the leading edge is detected at a timing that exceeds the adjustment range (+/-4.5mm), the system
alerts J080 and stops.
2. Printing Process
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