– 2.18 –
2-3. Brief explanation of media size detection control
Detection of the front ends of a media → Detection by the paper width sensor
Detection of the right- and left-side edges of a media → Detection by paper width sensor
Brief flow chart of the media width detection processing
Edges of the media are detected through the use of the difference in lightness between the
media and the platen (cutter slit), based on which the paper width is calculated.
Calculate from R edg and E edg.
Start the detection.
Turn on the paper width sensor.
The sensor moves onto the media to permit
the reading of the sensor value. → S on
The sensor moves to the Y coordinate of
the paper sensor to ensure that the sensor
reaches a position on which the media is placed.
The sensor moves out of the media to permit
the reading of the sensor value. → S off
The sensor moves to the Y coordinate at the rightmost end
of the platen to ensure that the sensor reaches a position
on which the media is not placed.
Calculation of the edge detection value
Calculation is made from “S on” and “S off.”
(Standard value: 50%)
The rightmost edge of the media is detected from
the rightmost edge of the device. → R edg
The leftmost edge of the media is detected from
the leftmost edge of the media. → L edg
Calculation of the paper width
Turn off the paper width sensor.
The sensor travels to the Y coordinate of
the origin for plotting.
After the sensor travels to the Y coordinate, the device notifies
the origin plotting of the current position.
Head capping
Detection completes.
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