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Parameters Used
10/19/2009 TTP 8000 Technical Manual P1003638-003
Garbage, Black Mark and Out Of Paper Detection
For every step the paper is feed, the black mark sensor is sampled to detect garbage, black
marks or out of paper.
When the printer detects blackness is has to check if it is only garbage:
The 5-mm is a constant added to make sure that noise on the edge not will interfere with the
samples. If it at this point still is still black we have detected out of paper.
Be careful about n40 and n39. If n39 – n40 is too small, then the minimum detection area will
be too little. This area should not be less than 2 mm.
Garbage range n40
Printed black mark n39
Valid black mark range (n39 – n40 + 5mm)
5 mm
Constant
Out of paper
If the paper… Then it is…
gets white again within n40 x 0.1 mm garbage and the spot should be
ignored.
is still black after n40 x 0.1 mm probably a black mark.
gets white within an additional n39-n40 plus 5 mm a black mark
n37 &
n38
n39
10 mm
Detection
area