eXtendo®
Thermal Printer Family
Part No. D-684-124
Mod. No. 4 270919 HW1
page 11 of 33
Figure 3
Figure 4
3.6.
Operation of Sensors and LEDs
3.6.1.
Paper Entrance / Black Mark Sensor
The basic function of the paper entry sensor in the paper entrance area has been described
above. But the same sensor is also used to detect Black Marks. Black Marks are blackened
areas placed on the paper during the converting process. They are generally used, in
conjunction with appropriate printer commands, to advance the paper to a specific
position after each print job. One common reason for this is to so that preprinted
information is properly located with respect to information printed by the printer itself, for
example, printing inside a preprinted box. Black marks can be located on the thermally
coated side of the paper (where printing takes place) or on the back of the paper,
depending upon the location of the sensor.
The eXtendo® series of printers is designed to allow for numerous Paper Entrance/Black
Mark sensor locations during manufacturing (The location of this sensor cannot be
changed once the printer is built). Also, two different sensor types can be used. The most
