Chapter 2 Operating Principles
2-1. Operation of Each Mechanism
CL-S400DT 2-6
2-1-3. Media Detection Mechanism
The major components of the media detection mechanism are:
(a) SA Adjust Sensor U (Upper sensor (transparent sensor) of the adjustable sensor)
(b) SA Adjust Sensor L (Lower sensor (reflective sensor) of the adjustable sensor)
The adjustable sensor consists of the transparent sensor (upper sensor) and the reflective sensor
(Lower sensor). The transparent sensor consists of 1 phototransistor and the reflective sensor
consists of a reflective type photointerrupter.
The following table shows how the sensors detect a label, U-shaped notch or black mark.
(1) Detecting labels/U-shaped notches of tag
For detecting labels on the liner or U-shaped notches of tag, both transparent sensor (upper
sensor) and reflective sensor (lower sensor) are used.
In this case, both sensors need to be aligned with a label center or with a U shape notch.
* Media Sensor menu: See Through (default)
Detecting labels:
The light emitted from the light emitter of the transparent sensor passes through the label and
reaches the phototransistor of the reflective sensor. Since the amount of light that can pass
through the liner part alone and the label part (label stuck on the liner) differs, the current
flowing into the phototransistor also differs. Therefore the output voltage level changes
accordingly.
From the difference in output of the phototransistor, the CPU on the “SA Main PCB” can
distinguish between the liner part and label part so that it can detect the leading edge of label.
Also, media end can also be detected from the difference in output of the phototransistor.
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