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8.11 To set the rotary encoder resolution
If a rotary encoder is connected to the controller, the print speed is
automatically matched to the conveyor belt speed through the
impulses of the rotary encoder.
The following parameters must be entered:
Rotary encoder resolution
the resolution is the number of pulses per inch (ppi).
Intensity
the intensity in dpi (dots per inch).
Printing width
The number of pixel can be increased or decreased using this
parameter. The print image becomes narrower or wider.
Calculation example of rotary encoder resolution:
The standard rotary encoder has a friction wheel circumference of
200 mm and generates 5 000 impulses per revolution. If the friction
wheel of the rotary encoder runs directly on the belt, the calculation
is as follows:
1.
Conversion to inches:
200 mm / 25.4 mm = 7.874 inches
2.
Resolution of the rotary encoder:
5000 impulses / 7.874 inches = 635 impulses/inch = 635 ppi
If a standard rotary encoder is mounted directly onto a shaft, the
distance to be measured is the distance covered by a product on
the conveyor belt during a single rotary encoder revolution (e.g.
300 mm).
1.
Conversion to inches:
300 mm / 25.4 mm = 11.81 inches
2.
Resolution of the rotary encoder:
5000 impulses / 11.81 inches = 423 impulses/inch = 423 ppi
The calculated value must be then fine-tuned, using the test image.
(Speedtest.00I)
Page 63 of 127
Art. No.: 72801001
Operation
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