Paper Low Sensor Option - Hengstler eXtendo XF 4 120322 Eli Operating Manual

XF
eXtendo® Thermal Printer Family
Additionally, the exit sensor is monitored while first printing after a cut. After a cut, the
printer "knows" where the end of the paper is. As printing takes place, the printer also
"knows" when the edge of the paper should reach the sensor. If the paper does not reach
the sensor when expected, the printer reports a paper jam through the status request
command.
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Note: Care must be taken when mounting the eXtendo® XF printers to ensure that the
sensor is not exposed to direct sunlight. The multiple wavelengths of sunlight can cause
false readings from this sensor. Therefore, always shield the chute and sensor from direct
sunlight by use of chutes, shrouds, covers and similar techniques.

3.5.5 Paper Low Sensor Option

An optional Paper Pre-End Sensor can be mounted by the customer. The sensor is a
reflective type, meaning that it senses paper by bouncing light off the paper and detecting
its reflection. The sensor is equipped with a long cable to allow flexible mounting by the
customer, and the sensor itself is mounted on a small circuit board with a hole to be used
for mounting it. Simply mount the sensor where it will detect paper low. It typically
mounted facing the side of the paper roll, so that as the diameter of the paper roll
decreases, it eventually loses the reflection of the light and changes state. Plug the PPE
sensor into the sensor connector on the printer rear side. While the exact distance of the
sensor from the paper varies from application to application, it is typically 2-5 mm for
optimal sensing, compare Figure 5.
If the printer with a paper roll holder is ordered, the sensor comes pre-mounted to the
paper roll holder and with the sensor connector plugged into the eXtendo® XF controller
board. Figure 5 shows the PPE sensor itself, while Figure 6 is the input circuit to the Paper
Pre-End (Paper Low) sensor.
Part No. D-684-399
Figure 5 – Paper low sensor
Figure 6 – Paper Low Sensor Circuit
Mod. No. 4 120322 Eli
Paper
Low
connec
-tor
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