VIDEOJET 8520 - Shaft Encoder (Optional)

3-22 Installation of Printhead and Ink Cartridge Rev AB
Videojet 8520 Operator Manual
6 Set the sensitivity to an average (point C) between point A and point
B. Once the sensitivity difference between point A and point B is half a
rotation, stable identification will be possible.
7 Set the D.ON/L.ON switch in dependency on whether the sensor
should be switched ON or OFF for an object.
Note: After changing over the FINE/TURBO selector switch, sensitivity
must be readjusted.
Shaft Encoder (Optional)
The shaft encoder is used to match the printing speed to the speed of the
target material as it passes the printhead. The encoder is connected to the
controller’s encoder input.
Measurement of the speed by means of shaft encoder
For optimal printing, precise speed measurement is needed. Since the
speed of the product may fluctuate slightly (for example, because of
unevenness in the conveyor belt or starting and stopping of production),
the use of an external shaft encoder is recommended.
A
C
B
A
B
C
For smooth or hard belt surfaces
(suitable for standard shaft encoders)
Figure 3-33: Shaft Encoder and Rubber Measuring Wheel